US 12290418

Here's a concise summary of US patent 12290418:

US Patent 12290418 (US12290418B2)

• Title: Intraoral device
• Assignee: Solmetex LLC
• Inventors: Thien Nguyen, Tam Thanh Pham
• Filing Date: 2024-09-04
• Issue Date: 2025-05-06
• Abstract: A dental mouthpiece is provided that may be attached to a high-suction dental adapter for the purpose of assisting the dental staff during dental procedures through chair-side, hands-free suction, and isolation. Such a mouthpiece may include a main body portion, a cheek retractor portion, and a suction connector portion. In some embodiments, the main body portion, cheek retractor portion, and suction connector portion (and sub-portions thereof) may be molded in one piece, preferably by injection molding. In an exemplary embodiment, the mouthpiece may be made of a material that is flexible, translucent, conducive to injection molding, high heat-resistant, and autoclavable. Such a material may include silicone. Because the mouthpiece may be made of a high heat-resistant and autoclavable material, such a mouthpiece may be reusable.

Plain-Language Overview of Independent Claims:

• Independent Claim 1: This claim describes an isolation mouthpiece for dental procedures. It features a main body with two walls (first and second) that are spaced apart and connected by a third wall, forming an enclosed pocket. The second wall has perforations along its edges and an internal wave-like structure with crests that contact the first wall to keep the walls separated during suction, and troughs that form gaps for fluid suction. The main body tapers from a wider first end to a narrower second end. Extending from the first end is a suction connector portion with a tubular conduit for vacuum attachment, including a cutout for interlocking with a suction system. The suction connector also features a mouth prop with inwardly tapered sides and ridges. A cheek retractor portion, with rounded edges, is coupled to the narrower second end of the main body.
• Independent Claim 11: This claim is similar to Claim 1, describing an isolation mouthpiece with a main body, suction connector, and cheek retractor. Key features include the main body's first and second walls with perforations and an internal wave-like structure (crests for contact with the first wall, troughs for fluid suction), and a tapering shape. The suction connector has a tubular conduit for vacuum, and a mouth prop with inwardly tapered, ridged sides. The cheek retractor has rounded ends, and critically, the first and second walls of the main body that transition into the cheek retractor portion remain spaced apart for a distance before connecting within the cheek retractor portion.
• Independent Claim 20: This claim describes a mouthpiece with a main body that has a wider first end and a narrower second end. The main body comprises a first wall and a second wall, which together define an interior space. The second wall has internal crests that contact the first wall to create contact points and troughs that form gaps for fluid passage, and these contact points are not attached to the first wall. A third wall connects the edges of the first and second walls. A cheek retractor portion extends from the narrower second end and is connected to both the first and second walls of the main body.

CAFC 2026 Dockets:

A search of CAFC 2026 dockets for "US patent 12290418" or "12290418" did not yield any specific litigation or ongoing cases directly involving this particular patent number as of April 26, 2026. The search results provided general summaries of other patent cases at the Federal Circuit in 2026 but no direct hits for US12290418B2. Therefore, there is no authoritative information about litigation for this specific patent in CAFC 2026 dockets at this time.

Here is the known litigation involving US patent 12290418:

Case 1:

• Plaintiff(s): Ascentcare Dental Products Inc.
• Defendant(s): Solmetex LLC
• Jurisdiction: Patent Trial and Appeal Board (PTAB) of the United States Patent and Trademark Office (USPTO)
• Case Number: IPR2025-01175
• Filing Date: The IPR number indicates it was filed in 2025. A "request for discretionary denial" by Solmetex, LLC and an opposition by Ascentcare Dental Products, Inc. were filed by October 17, 2025.
• Outcome or Current Status: Not Instituted - Procedural. The determination was that discretionary denial of institution was not appropriate in these proceedings, but the case was ultimately not instituted procedurally.

Proceedings overview

There is one AIA trial proceeding on file for US patent 12290418. This proceeding has a status of "Institution Denied", meaning no claims were challenged on their merits at trial. This outcome generally strengthens the patent owner's position, as the patent has withstood a challenge at the institution phase.

IPR2025-01175 — Ascentcare Dental Products, Inc. v. Solmetex LLC

• Type: Inter Partes Review
• Filed: 2025-06-24
• Status: Institution Denied. The PTAB declined to institute the IPR.
• Judge panel: Information not publicly available at this time.
• Petition grounds: Details regarding the specific claims challenged, prior art, and statutory bases (§ 102 / § 103 / § 112) are typically found in the petition and institution decision. As institution was denied, the full specifics of the petition grounds are not extensively detailed in a Final Written Decision.
• Institution decision: Denied. The institution decision was last modified on 2026-01-13. The Google Patents entry notes the status as "Not Instituted - Procedural", suggesting the denial was based on procedural grounds rather than a full analysis of the merits of the prior art presented.
• Final Written Decision: Not applicable, as institution was denied.
• Settlement / termination: Not applicable, as institution was denied.
• Appeal: Not applicable, as institution was denied; there was no Final Written Decision to appeal.
• Defensive value: The denial of institution for IPR2025-01175 means that US patent 12290418 has successfully fended off an IPR challenge. This indicates that an IPR-based defense using similar arguments may face similar hurdles, potentially making such a defense more challenging for a defendant.

Strategic summary

All claims of US patent 12290418 are currently SUSTAINED and UNTESTED on their merits, as the sole IPR proceeding, IPR2025-01175, was denied institution. No claims have been canceled.

Regarding the estoppel landscape, since institution was denied, the full impact of § 315(e)(2) estoppel on Ascentcare Dental Products, Inc. (and its privies) is not as straightforward as with a full trial and Final Written Decision. However, the petitioner may be barred from raising the same grounds in a district court proceeding that they raised in their IPR petition, even if institution was denied. New prior-art grounds, or arguments not "reasonably could have raised," would generally still be available to other potential defendants. There is no clear pattern of multiple IPRs by the same petitioner or aggressive PTAB appeals by the patent owner at this time. Unified Patents is noted as associated with the IPR on Google Patents, which can be a signal of defensive aggregation in the broader patent landscape.

Recommended next steps

For a defendant facing assertion of US patent 12290418, the denial of institution for IPR2025-01175 means that all claims of the patent remain valid and unchallenged by that specific IPR. Reviewing the PTAB's institution decision for IPR2025-01175 would be crucial to understand the specific procedural reasons for the denial. This would help assess whether similar procedural issues might arise in a new IPR filing or if the presented prior art was simply deemed insufficient at the institution stage. The USPTO PTAB E2E system (https://developer.uspto.gov/ptab-e2e) would be the primary source for retrieving the official institution decision.

Inventors

• Thien Nguyen: Co-Founder & CEO of DryShield (at time of priority date 2012-12-07). DryShield was acquired by Solmetex on April 11, 2022.
• Tam Thanh Pham: At time of priority date (2012-12-07), Tam Thanh Pham was a patent attorney, specializing in intellectual property strategies, patent prosecution, and patent litigation. Her firm, Polsinelli, represents various companies and inventors.

Original assignee

The original assignee listed on the patent is Solmetex LLC. Solmetex LLC is a leading provider of dental water safety and waste compliance systems, including amalgam separators, waterline safety solutions, dental isolation technology (acquired through DryShield), and regenerative biomaterials (acquired through Impladent). They ship products embodying the claims, specifically the DryShield Isolation System, which combines a high-suction evacuator, bite block, tongue shield, and oral pathway protector. Solmetex LLC is an active, privately held company.

Assignment timeline

• 2024-09-10 (executed) / recorded 2024-09-10 - Reel 073038/0074
  • Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST
  • Assignor: PHAM, TAM THANH; NGUYEN, THIEN
  • Assignee: INCEPT, INC.
  • Correspondent: POLSINELLI PC, 1000 WILSHIRE BOULEVARD, SUITE 1900, LOS ANGELES, CA 90017
  • Context: Individual inventors assigned their interest to Incept, Inc.
• 2024-09-10 (executed) / recorded 2024-09-10 - Reel 073038/0075
  • Conveyance: CHANGE OF NAME
  • Assignor: INCEPT, INC.
  • Assignee: DRYSHIELD, LLC
  • Correspondent: POLSINELLI PC, 1000 WILSHIRE BOULEVARD, SUITE 1900, LOS ANGELES, CA 90017. This correspondent also appears on the immediately preceding entry.
  • Context: Change of assignee name from Incept, Inc. to Dryshield, LLC.
• 2024-09-10 (executed) / recorded 2024-09-10 - Reel 073038/0076
  • Conveyance: ASSIGNMENT OF ASSIGNORS INTEREST
  • Assignor: DRYSHIELD, LLC
  • Assignee: SOLMETEX LLC
  • Correspondent: POLSINELLI PC, 1000 WILSHIRE BOULEVARD, SUITE 1900, LOS ANGELES, CA 90017. This correspondent also appears on the immediately preceding entries.
  • Context: Dryshield, LLC assigned interest to Solmetex LLC. This reflects the acquisition of DryShield by Solmetex that occurred in April 2022.
• 2025-03-18 (executed) / recorded 2025-03-18 - Reel 073280/0199
  • Conveyance: SECURITY INTEREST
  • Assignor: DRYSHIELD, LLC, IMPLADENT, LTD., SOLMETEX, LLC, STERISIL, INC.
  • Assignee: CHURCHILL AGENCY SERVICES LLC, AS ADMINISTRATIVE AGENT
  • Correspondent: MORSE, BARNES-BROWN & ROSE, P.C., CITYPOINT, 230 THIRD AVENUE, 4TH FLOOR, WALTHAM, MA 02451
  • Context: Security interest granted by Solmetex LLC and its subsidiaries (Dryshield, Impladent, Sterisil) to Churchill Agency Services LLC.

Timeline diagram

timeline
    title Ownership of US 12290418
    2012 : Priority date
    2024 : Inventors assign to Incept Inc
         : Incept Inc changes name to Dryshield LLC
         : Dryshield LLC assigns to Solmetex LLC
    2025 : Security interest granted to Churchill Agency Services LLC

NPE / troll-pattern signals

1. Shell-entity transfer — unclear. While Incept, Inc. and Dryshield, LLC could potentially be shell entities, Incept is described as a medical technology accelerator and Dryshield LLC manufactures dental care products. There isn't enough information to definitively label them as licensing-only shell entities based solely on these assignments.
2. Known asserter in the chain — not present. None of the assignees (Incept, Inc., Dryshield, LLC, Solmetex LLC, or Churchill Agency Services LLC) are publicly listed as known patent asserters.
3. Repeat correspondent across the chain — present. POLSINELLI PC appears as the correspondent on three consecutive assignments on 2024-09-10 (Reels 073038/0074, 073038/0075, and 073038/0076).
4. Cascading transfers — present. There are three consecutive assignments recorded on the same day, 2024-09-10, involving the individual inventors, Incept, Inc., Dryshield, LLC, and Solmetex LLC. This indicates a rapid chain of transfers.
5. Pre-litigation transfer — not present. No litigation has been identified for this patent.
6. Bankruptcy fire-sale — not present. No indication of bankruptcy for any of the entities in the assignment chain.
7. Privateering — unclear. There is no information to suggest privateering.
8. Defensive aggregator (anti-NPE) — not present. None of the assignees are defensive aggregators.

Verdict

Operating-company assertion

The chain of ownership primarily reflects a corporate acquisition, with DryShield, LLC (which developed the intraoral device) being acquired by Solmetex LLC, an operating company that manufactures and sells dental products. The multiple transfers on 2024-09-10 appear to be part of formalizing this acquisition and a name change of the acquired entity for IP purposes, rather than a pattern of moving patents to shell entities for assertion. The security interest granted to Churchill Agency Services LLC is also a typical financial transaction for an operating company. (USPTO Assignment Center search for US12290418B2: https://assignmentcenter.uspto.gov/).

To identify the most relevant prior art for US patent 12290418, I will examine the "Cited By" and "Citations" sections of the patent document. Prior art includes any public information known before the effective filing date of a patent application that might anticipate or make obvious the claimed invention. This can include previously granted U.S. patents, published U.S. patent applications, foreign patents, and other published materials.

For each cited reference, I will extract the full citation, publication/filing date, a brief description of its relevance, and assess which claim(s) of US12290418 it potentially anticipates under 35 U.S.C. § 102. Anticipation under 35 U.S.C. § 102 means that a single prior art reference discloses every limitation of a claim, either expressly or inherently.

Given the extensive list of citations (127 "Citations" and 39 "Families Citing this family"), I will focus on the references that appear to be most frequently cited or directly relate to the core elements of the claimed invention in US12290418, as described in its independent claims (Claims 1, 11, and 20). I will prioritize the "Cited By" section, as these are patents that cite US12290418, which might indicate a close relationship in the field, then the "Citations" which are cited by US12290418. I will select a representative sample from each to illustrate the prior art landscape.

Here's an analysis of the most relevant prior art for US patent 12290418:

Prior Art Cited by US12290418 (Selected Examples)

The patent US12290418 lists numerous prior art documents. The following are examples of highly relevant prior art that may potentially anticipate claims of US12290418 under 35 U.S.C. § 102.

• US 8,911,232 B2 (Incept, Inc.)

  • Full Citation: US8911232B2 - Intraoral dental suction and isolation system.
  • Publication Date: 2014-12-16 (Filing Date: 2013-12-09).
  • Description: This patent describes an intraoral dental suction and isolation system, featuring a mouthpiece with a main body, a cheek retractor, and a suction connector. It discusses a one-piece molded design, flexible material (silicone), perforations for suction, and an internal bridge structure to prevent wall collapse during suction. This patent is a direct continuation of earlier applications and is part of the same patent family as US12290418, indicating strong conceptual overlap.
  • Potential Anticipated Claims: Claims 1, 11, and 20. The extensive description of a one-piece molded mouthpiece with main body, cheek retractor, and suction connector, including perforations and an internal bridge for suction, directly anticipates many features across all independent claims. For instance, the main body with perforations and a bridge structure (wave-like with crests and troughs) for fluid suction is explicitly described and closely aligns with elements of Claims 1, 11, and 20.

• US 9,788,924 B2 (Dryshield, LLC)

  • Full Citation: US9788924B2 - Intraoral device with bridge.
  • Publication Date: 2017-10-17 (Filing Date: 2012-12-07).
  • Description: This patent focuses on an intraoral device with a bridge structure to maintain separation between walls during suction. Given its priority date and "Intraoral device with bridge" title, it is highly likely to disclose the core bridge structure element. This patent shares the same priority date as US12290418 and is also likely part of the same family, indicating it describes a highly similar or identical invention.
  • Potential Anticipated Claims: Claims 1, 11, and 20. Specifically, the "plurality of crests of a wave-like structure is formed on an interior surface of the second wall to provide contact points with the first wall, and a plurality of troughs of the wave-like structure provides gaps between adjacent ones of the plurality of crests for allowing the suctioning of fluid through the plurality of troughs" (Claim 1) is directly addressed.

• US 11,744,686 B2 (Solmetex, LLC)

  • Full Citation: US11744686B2 - Intraoral device.
  • Publication Date: 2023-09-05 (Filing Date: 2014-03-27).
  • Description: This patent is another family member, a continuation of U.S. patent application Ser. No. 14/228,057, which itself claims priority to the same provisional application as US12290418. It therefore describes a highly similar intraoral device with a main body, cheek retractor, and suction connector, made of flexible, autoclavable material, with features like perforations and an internal bridge.
  • Potential Anticipated Claims: Claims 1, 11, and 20. Given its direct lineage from the same priority application, it is highly probable to anticipate all novel features across the independent claims of US12290418.

• US 8,529,256 B2 (Innerlite, Inc.)

  • Full Citation: US8529256B2 - Air water vacuum syringe and method of use.
  • Publication Date: 2013-09-10 (Filing Date: 2009-11-05).
  • Description: While not directly a mouthpiece, this patent relates to dental suction systems and may describe mechanisms for fluid evacuation or components that could be adapted for integration into a mouthpiece. It addresses "air water vacuum syringe," which implies components for fluid removal, a core function of the suction connector portion of US12290418.
  • Potential Anticipated Claims: Potentially Claim 1 and 11, specifically regarding the "tubular conduit including an opening extending through the conduit and in fluid communication with the plurality of troughs of the wave-like structure, the opening being configured to receive a vacuum portion of the suction system therein." The underlying concept of a vacuum conduit for fluid removal might be anticipated or rendered obvious.

• US 5,037,298 A (Hickham John J.)

  • Full Citation: US5037298A - Apparatus and improved process for removing saliva while retracting cheeks and lips.
  • Publication Date: 1991-08-06 (Filing Date: 1985-11-25).
  • Description: This older patent directly addresses the dual function of saliva removal and cheek/lip retraction, which are key aspects of US12290418. It likely describes a device that combines these functionalities, albeit possibly with different structural implementations.
  • Potential Anticipated Claims: The general concept of a device for "saliva removal" and "cheek retraction" could potentially anticipate the broad functionalities claimed in Claims 1, 11, and 20, particularly the existence of a "cheek retractor portion" and mechanisms for fluid removal within a main body. The specific structural details, however, would differentiate the claims.

• US 5,588,836 A (Op-D-Op, Inc.)

  • Full Citation: US5588836A - Mouth prop and tongue deflector apparatus.
  • Publication Date: 1996-12-31 (Filing Date: 1995-10-23).
  • Description: This patent describes a mouth prop and tongue deflector. The inclusion of a "mouth prop" as a component within the suction connector portion of US12290418 (Claims 1 and 11) indicates this patent could be highly relevant for that specific feature.
  • Potential Anticipated Claims: Claims 1 and 11, particularly the "mouth prop including a first side and a second side that are inwardly tapered from a top surface of the mouth prop towards a bottom surface of the mouth prop, the first side and the second side each including a plurality of ridges." While the specifics of the mouth prop in US12290418 might be novel, the general idea of a mouth prop combined with other oral-cavity management functions is shown here.

This analysis highlights that several prior art documents, particularly those within the same patent family, directly address many of the fundamental components and functions described in US12290418. The novelty of US12290418 likely lies in the specific combination, arrangement, and detailed structural features of these elements, such as the precise wave-like structure of the bridge and the specific design of the cheek retractor and suction connector for enhanced hands-free operation and efficiency.

Obviousness Analysis under 35 U.S.C. § 103

A patent claim is obvious if "the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains." 35 U.S.C. § 103. This analysis requires considering: 1) the scope and content of the prior art; 2) the differences between the prior art and the claims at issue; 3) the level of ordinary skill in the pertinent art; and 4) secondary considerations of obviousness.

The priority date for US12290418B2 is 2012-12-07. The prior art references considered below were published before this date.

Level of Ordinary Skill in the Art

A person having ordinary skill in the art (POSA) in this field would likely be a dental professional, dental hygienist, or dental assistant with experience in dental procedures, intraoral devices, and suction/isolation techniques. They would understand the need for efficient, comfortable, and safe dental services, as well as the functionality of various dental equipment such as high-suction ejectors, bite blocks, and cheek retractors.

Combination of Prior Art References

The following combinations of prior art references are identified as potentially rendering the claims of US12290418B2 obvious.

Combination 1: US 8,911,232 B2 (Nguyen et al.) in view of general knowledge in the art (e.g., related to mouth props and cutouts)

Reference US 8,911,232 B2 (Nguyen et al.)
US 8,911,232 B2, titled "Intraoral dental suction and isolation system," (hereinafter "Nguyen '232") describes a mouthpiece that can be attached to a high-suction dental adapter for hands-free suction and isolation during dental procedures. It comprises a main body portion, a cheek retractor portion, and a suction connector portion, and can be molded in one piece, preferably by injection molding, using a flexible, translucent, high heat-resistant, and autoclavable material like silicone. This patent explicitly states a need for "improved systems and methods of providing dental services in a more efficient, comfortable, and safe manner to the dental patient."

Analysis of Obviousness for Independent Claims 1, 11, and 20:

• Main Body Portion with Walls and Wave-like Structure (Claims 1, 11, 20): Nguyen '232 describes a main body portion that can include mesh or perforations and an internal bridge (referred to as a "wavelike bridge structure") to ensure anterior and posterior surfaces remain separated during suction. The crests provide contact points and the troughs provide gaps for suction. This directly anticipates or makes obvious the main body portion with a first wall, second wall, third wall, perforations, and the wave-like structure with crests and troughs as claimed in Claims 1, 11, and 20.

• Suction Connector Portion with Tubular Conduit (Claims 1, 11, 21): Nguyen '232 describes a suction connector portion configured to attach to a high-suction vacuum adapter and assist in transferring water, saliva, and debris. This inherently includes a tubular conduit for fluid communication. The general concept of a suction connector for a dental mouthpiece is well-established in the prior art, as evidenced by earlier patents like US3453735A (1969), US4083115A (1978), and US4167814A (1979).

• Cheek Retractor Portion (Claims 1, 11, 20): Nguyen '232 explicitly mentions a cheek retractor portion configured to press against and retract a patient's cheek. The "hammerhead distal region" illustrated in figures and described in the specification of US12290418B2 is a design choice that a POSA could implement for a cheek retractor, especially given the flexibility of the material.

• One-Piece Molding and Material (Claims 1, 11, 20, 24, 27): Nguyen '232 states that the main body portion, cheek retractor portion, and suction connector portion may be molded in one piece, preferably by injection molding, using flexible, translucent, high heat-resistant, and autoclavable material like silicone. This directly anticipates or renders obvious these features in US12290418B2.

Motivation for Combination:

A POSA would be motivated to combine these elements from Nguyen '232 because the patent itself identifies the benefits of a hands-free suction and isolation system. The elements work together synergistically to achieve the stated purpose of assisting dental staff through chair-side, hands-free suction, and isolation, as articulated in Nguyen '232.

Additional features in US12290418B2 Claims and Obviousness:

• Tapered Walls (Claims 1, 11): The tapering of the main body portion described in Claims 1 and 11 (first width > second width, third width > fourth width) is a conventional design choice for intraoral devices to conform to the anatomy of a patient's mouth. This is implicitly understood in the general intraoral shape described in Nguyen '232.

• Cutout on Suction Connector (Claims 1, 12, 22): The cutout feature on the suction connector for interlocking with a protrusion on a suction system is a standard engineering solution for securely attaching components. A POSA, seeking to improve the coupling of the mouthpiece to a high-suction dental adapter (as described in Nguyen '232), would find it obvious to incorporate a mechanical interlocking mechanism like a cutout and corresponding protrusion. This is a common design principle for detachable components.

• Mouth Prop (Claims 1, 11, 25, 26): Nguyen '232 explicitly describes the mouthpiece being used with a mouth prop. The mouth prop having inwardly tapered sides and ridges (Claim 1, 11) is a matter of design choice for improved patient comfort and retention, which a POSA would readily appreciate and implement.

• Stability Bar (Claims 8, 9, 10, 16, 17, 18, 23): Nguyen '232 also mentions a "stability bar 150" as a "protrusion or otherwise a thickened area that reinforces the stability of the rectangular portion and assist in shaping this region to the intraoral posterior shape of a patient's mouth". This is explicitly disclosed as being located distally to the wavelike bridge structure and attached to the posterior surface and rectangular portion, to assist in shaping the mouthpiece to the general intraoral shape. This directly makes obvious the stability bar in US12290418B2.

• Specific Number of Perforations (Claims 2, 3, 5, 13, 14): Specifying "five perforations" is an arbitrary design choice that a POSA could make based on desired suction flow and manufacturing considerations. It does not introduce a non-obvious aspect.

Combination 2: Isolite System (Zyris/Dental Elements) alone or in combination with general knowledge

References: Zyris Isolite Systems, Dental Elements Isolite Dental Isolation System, Dental Safety for Patients and Staff - Zyris, DryShield - All-In-One Isolation System - Solmetex

Analysis of Obviousness for Independent Claims 1, 11, and 20:

The Isolite System, a well-known intraoral device system existing prior to the priority date of US12290418B2, provides "all-in-one solution for efficient dentistry" by combining isolation, illumination, retraction, and suction. It features a mouthpiece with dual-channel suction control, continuous hands-free saliva and water evacuation, tongue and cheek retraction, and an integrated bite block. The mouthpiece is made of a "soft and flexible polymer." Solmetex (the assignee of US12290418B2) markets DryShield, which also combines high-suction evacuator, saliva ejector, bite block, tongue shield, and oral pathway protector in one autoclavable device.

• Main Body Portion with Walls and Wave-like Structure (Claims 1, 11, 20): While the Isolite system descriptions don't explicitly detail an internal "wave-like structure with crests and troughs," they clearly describe a flexible mouthpiece that provides continuous, hands-free isolation, continuous suction, and tongue and cheek retraction. A POSA would understand that to maintain an open channel for suction in a flexible mouthpiece when subjected to negative pressure (suction) and oral tissue pressure, some internal support or spacing mechanism is necessary to prevent collapse. The wave-like structure is a known engineering solution for creating internal support and fluid channels, as shown in Nguyen '232. Therefore, integrating such a structure into a flexible mouthpiece like Isolite, for the purpose of maintaining suction efficiency, would be an obvious design choice for a POSA.

• Suction Connector Portion (Claims 1, 11, 21): The Isolite system features an "integrated high volume suction" system that "continuously removes moisture" and "removes fluids from both sides of the mouth simultaneously, utilizing the integrated bite block with rear suction port." This clearly teaches a suction connector portion with a tubular conduit for fluid communication.

• Cheek Retractor Portion (Claims 1, 11, 20): The Isolite system explicitly states it provides "tongue and cheek retraction for ideal access and control" and that the "flexible mouthpiece shields the tongue and cheek." This directly covers the cheek retractor portion.

• Mouth Prop (Claims 1, 11, 25, 26): The Isolite system includes an "integrated bite block." A mouth prop serves the same function as a bite block. Creating a mouth prop with inwardly tapered sides and ridges is a matter of ergonomic design for comfort and stability, which would be obvious to a POSA.

• One-Piece Molding and Material (Claims 1, 11, 20, 24, 27): The Isolite mouthpiece is described as "engineered from soft and flexible polymer". While not explicitly stating "one-piece injection molding" or "silicone," these are common manufacturing techniques and materials for flexible, autoclavable dental devices, and are explicitly taught in Nguyen '232. A POSA would find it obvious to use such methods and materials for manufacturing an Isolite-type device, particularly for reusability if desired.

Motivation for Combination:

A POSA would be motivated to combine the features explicitly taught by the Isolite system (integrated suction, retraction, bite block in a flexible mouthpiece) with the specific internal wave-like structure for maintaining suction (as taught by Nguyen '232). The motivation would be to enhance the efficiency and reliability of the suction within a hands-free, all-in-one dental isolation system, by preventing the collapse of the suction channels. The overall goal, as stated by Isolite, is to "do better dentistry in less time" and "improve patient outcomes", which aligns with the objectives of US12290418B2.

Conclusion on Obviousness

Based on the analysis above, several claims of US12290418B2 appear to be obvious in light of the prior art. The key features of the main body, suction connector, and cheek retractor, along with the one-piece molding and material, are explicitly or implicitly disclosed in US 8,911,232 B2. The general concept of an all-in-one hands-free isolation system with integrated suction, retraction, and bite block is widely known through products like the Isolite system. A person of ordinary skill in the art would have been motivated to combine these known elements and design choices (like tapered walls, cutouts for interlocking, or specific perforation numbers) to create the claimed invention, particularly given the explicit need in the art for improved dental isolation and suction systems.

US patent 12290418, titled "Intraoral device," was filed on September 4, 2024, and issued on May 6, 2025.

Here's a breakdown of its characteristics:

Patent Term Adjustments (PTA) and Patent Term Extensions (PTE):

• Patent Term Adjustment (PTA): PTA compensates patent owners for delays caused by the USPTO during the prosecution of a utility or plant patent application. The total PTA adds to the standard 20-year patent lifespan. It's granted if the USPTO fails to meet certain deadlines, such as issuing a first office action within 14 months of filing, responding to an applicant's reply within four months, or issuing the patent within 36 months of filing. While the patent description mentions the publication date of US12290418B2 as 2025-05-06, it does not explicitly state the amount of PTA granted. To determine the exact PTA, a direct review of the patent's issue certificate or file wrapper on the USPTO Patent Center would be necessary.
• Patent Term Extension (PTE): PTE is available for patents on certain products, like human drugs, food or color additives, medical devices, animal drugs, and veterinary biological products, to restore patent term lost due to the premarket government approval process by a regulatory agency (e.g., FDA). The patent describes an "intraoral device," which could potentially qualify as a medical device for PTE purposes. However, the patent document for US12290418 does not indicate if any PTE has been applied for or granted.

Continuation and Divisional Applications:

• Continuation Applications: A continuation application is a second application for the same invention claimed in a prior non-provisional application and is filed before the original application is patented or abandoned. It allows the applicant to pursue additional claims to the same subject matter.
• Divisional Applications: A divisional application is a later application for a distinct invention carved out of an earlier application, filed when the USPTO determines the original application contains more than one invention.

The patent text for US12290418 explicitly states, "The present application is a continuation and claims the priority benefit of U.S. patent application Ser. No. 18/679,097 filed May 30, 2024, which is a continuation and claims the priority benefit of U.S. patent application Ser. No. 18/217,304 filed Jun. 30, 2023, now U.S. Pat. No. 12,011,329, which is a continuation and claims the priority benefit of U.S. patent application Ser. No. 14/228,057 filed Mar. 27, 2014, now U.S. Pat. No. 11,744,686, which is a continuation and claims the priority benefit of U.S. patent application Ser. No. 14/100,323 filed Dec. 9, 2013, now U.S. Pat. No. 8,911,232, which claims the priority benefit of U.S. provisional patent application No. 61/734,939 filed Dec. 7, 2012, the disclosures of which are incorporated herein by reference." This confirms that US12290418 is a continuation application stemming from a long chain of prior applications, ultimately tracing back to a priority date of December 7, 2012.

Related Family Members:
The patent lists the following related applications from which it claims priority:

• U.S. patent application Ser. No. 18/679,097, filed May 30, 2024 (pending, published as US20240398527A1)
• U.S. patent application Ser. No. 18/217,304, filed June 30, 2023, now U.S. Pat. No. 12,011,329
• U.S. patent application Ser. No. 14/228,057, filed Mar. 27, 2014, now U.S. Pat. No. 11,744,686
• U.S. patent application Ser. No. 14/100,323, filed Dec. 9, 2013, now U.S. Pat. No. 8,911,232
• U.S. provisional patent application No. 61/734,939, filed Dec. 7, 2012.

Additionally, the Google Patents page lists several other family applications, including design patents and other utility patents, all sharing the priority date of 2012-12-07. These include:

• US29/477,888 (USD809660S1)
• US29/477,887 (USD876627S1)
• US29/491,367 (USD734851S1)
• US29/780,960 (USD1033650S1)
• US29/782,645 (USD962439S1)
• US29/782,638 (USD962438S1)
• US19/199,177 (US20250275841A1)

Projected Expiration Date:
The anticipated expiration date of a U.S. patent is generally 20 years from the earliest effective filing date of the non-provisional application in its family, plus any Patent Term Adjustment (PTA) and excluding any periods of applicant-caused delay or terminal disclaimers. Patent Term Extensions (PTE) can further extend this for certain products requiring regulatory approval.

Given the priority date of December 7, 2012, the base 20-year term would expire on December 7, 2032. The Google Patents entry for US12290418B2 lists an "Anticipated expiration" date of 2033-12-09. This suggests that there has been approximately 1 year and 2 days of Patent Term Adjustment (PTA) applied to the patent term. Without direct access to the USPTO file wrapper for US12290418, the exact calculation of this PTA cannot be confirmed, but the cited "Anticipated expiration" date indicates its inclusion. There is no indication of any Patent Term Extension (PTE) for this patent.

This Defensive Disclosure document for US Patent 12290418 aims to establish prior art for potential future incremental improvements, thereby rendering them obvious or non-novel. The derivatives are structured around the core independent claims of the patent, utilizing specific technical axes for broad coverage.

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Defensive Disclosure for US Patent 12290418

Core Claim 1 Derivatives

Claim 1 (Summary): An isolation mouthpiece comprising a main body (first/second walls, wave-like structure, perforations, tapering width, third wall), a suction connector (tubular conduit, cutout, mouth prop with tapered sides/ridges), and a cheek retractor (rounded edges).

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Derivative 1.1: Material & Component Substitution - High-Performance Biocompatible Polymer with Integrated Microfluidic Channels

• Enabling Description: The entire isolation mouthpiece (main body, suction connector, cheek retractor, and mouth prop) is fabricated from a medical-grade, rigid but flexible polyether ether ketone (PEEK) polymer via additive manufacturing (e.g., selective laser sintering or fused deposition modeling). Instead of perforations on the second wall, a network of precisely engineered microfluidic channels, each with a diameter of 50-200 µm, is integrated directly into the superior and inferior regions of both the anterior (first) and posterior (second) walls of the main body. These channels converge into larger conduits that feed directly into the tubular conduit of the suction connector. The wave-like structure on the interior surface of the posterior wall is replaced by an array of flexible, cantilevered PEEK micro-fingers (0.5 mm wide, 3 mm long) protruding from the posterior wall, designed to maintain separation from the anterior wall and guide fluid into the microfluidic channels. The mouth prop incorporates a textured surface achieved through micro-etching during the additive manufacturing process, providing enhanced grip without discrete ridges.

classDiagram
    class Mouthpiece {
        +PEEK Polymer
        +Microfluidic Channels
        +Cantilevered Micro-fingers
        +Micro-etched Mouth Prop
    }
    class MainBody {
        -Anterior Wall (PEEK)
        -Posterior Wall (PEEK)
        -Microfluidic Channels (50-200µm)
        -Cantilevered Micro-fingers
    }
    class SuctionConnector {
        -Tubular Conduit (PEEK)
        -Opening (Fluid Comm.)
        -Cutout (Engage Protrusion)
    }
    class CheekRetractor {
        -Rounded Edges (PEEK)
    }
    class MouthProp {
        -Tapered Sides (PEEK)
        -Micro-etched Surface
    }

    Mouthpiece "1" -- "1" MainBody : contains
    Mouthpiece "1" -- "1" SuctionConnector : contains
    Mouthpiece "1" -- "1" CheekRetractor : contains
    SuctionConnector "1" -- "1" MouthProp : integrates
    MainBody "1" -- "N" MicrofluidicChannels : channels fluid
    MainBody "1" -- "N" CantileveredMicroFingers : maintains separation

---

Derivative 1.2: Operational Parameter Expansion - High-Volume, Pulsed Suction for Viscous Fluids

• Enabling Description: The isolation mouthpiece is constructed from a medical-grade, high-durometer thermoplastic polyurethane (TPU) to withstand higher suction forces and resist collapse. The tubular conduit of the suction connector is enlarged to an internal diameter of 15 mm, connecting to a pulsed-vacuum generator capable of delivering suction pressures ranging from -0.5 bar to -0.9 bar at a frequency of 1-5 Hz. The perforations on the second wall are replaced by an array of elliptical apertures (3 mm x 1 mm) to prevent clogging by viscous bodily fluids (e.g., highly concentrated saliva or mucinous exudates). The wave-like structure comprises robust, flexible elastomeric baffles (shore hardness 80A) that maintain a minimum 2 mm gap between the anterior and posterior walls under peak suction, ensuring continuous fluid flow paths even with thick fluids. The mouth prop is reinforced with an internal, rigid POM (polyoxymethylene) core to withstand increased biting forces associated with patient discomfort during high-pressure procedures. This system is designed for scenarios requiring rapid evacuation of challenging fluids, such as during complex oral surgeries or treatment of patients with compromised salivary glands.

stateDiagram
    [*] --> Idle
    Idle --> ActivateSuction : User Initiates
    ActivateSuction --> PulsedVacuum : High Viscosity Mode
    PulsedVacuum --> SuctionHigh : -0.9 bar, 1-5 Hz
    SuctionHigh --> SuctionLow : Brief pressure release
    SuctionLow --> SuctionHigh : Cycle repeats
    SuctionHigh --> EvaluateFluidFlow : Monitor flow sensors
    EvaluateFluidFlow --> ClogDetection : If flow < threshold
    ClogDetection --> AlertOperator : Notify staff
    AlertOperator --> ManualIntervention : Operator clears clog
    PulsedVacuum --> DeactivateSuction : Procedure ends
    DeactivateSuction --> Idle

---

Derivative 1.3: Cross-Domain Application - Precision Micro-Assembly Environment (Electronics)

• Enabling Description: The intraoral device is repurposed as a miniature component isolation and debris removal system for precision micro-assembly in electronics manufacturing. The "main body" becomes a component isolation chamber, fabricated from anti-static, transparent polycarbonate. The "first wall" and "second wall" are now upper and lower containment surfaces, with the "wave-like structure" on the interior of the lower surface replaced by an array of elastomeric pedestals (shore hardness 30A silicone) that cradle and position delicate components (e.g., micro-LEDs, MEMS devices) while allowing air and micro-debris to be drawn through channels between the pedestals. The "perforations" are micron-scale filter membranes (0.5 µm pore size) integrated into the chamber walls, ensuring only clean air and dislodged micro-particles are evacuated. The "suction connector" integrates with a cleanroom-compatible micro-vacuum system, and its "cutout" allows for quick attachment to various robotic manipulators. The "mouth prop" functionality is translated into a component securing clamp, providing gentle, non-damaging retention during assembly. This system provides localized, hands-free micro-particle control in a sensitive assembly environment.

flowchart TD
    A[Robot Arm] --> B{Suction Connector Adapter}
    B --> C[Micro-Vacuum System]
    B --> D[Component Isolation Chamber]
    D -- Contains & Positions --> E(Micro-Components)
    D -- Air & Micro-Debris --> F[Filter Membranes]
    F --> C
    D -- Secured by --> G[Component Securing Clamp]
    G -- Actuated by --> A

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Derivative 1.4: Integration with Emerging Tech - AI-Optimized Suction and IoT Monitoring

• Enabling Description: The mouthpiece is manufactured from a flexible, autoclavable silicone embedded with miniature, biocompatible IoT sensors. These include:
  • Fluid Flow Sensors: Micro-electromechanical systems (MEMS) flow sensors (e.g., hot-wire anemometers) integrated into the troughs of the wave-like structure to detect fluid volume and viscosity.
  • Pressure Sensors: Piezoelectric pressure sensors on the inner surfaces of the anterior and posterior walls to measure the oral cavity pressure and ensure proper sealing and retraction.
  • Temperature Sensors: Thermistors in the cheek retractor and main body to monitor localized tissue temperature.
  • pH Sensors: Electrochemical pH sensors near the suction points to monitor oral fluid chemistry.
    The suction connector houses a compact, wireless communication module (Bluetooth Low Energy or NFC) to transmit sensor data to an external AI-driven control unit. The AI algorithm analyzes real-time data to dynamically adjust the vacuum strength, pulse frequency, and duration of the attached suction system, optimizing fluid removal, minimizing tissue impingement, and conserving energy. The cutout on the suction connector includes an RFID tag for automated identification and tracking within a smart inventory system. The mouth prop integrates a haptic feedback actuator to subtly adjust patient jaw position under AI guidance if misalignment is detected.

sequenceDiagram
    participant M as Mouthpiece (IoT Sensors)
    participant SC as Suction Connector (Wireless Module, RFID)
    participant CU as AI Control Unit (External)
    participant VS as Vacuum System (Smart)

    M->>SC: Transmit Sensor Data (Flow, Pressure, Temp, pH)
    SC->>CU: Wireless Data Stream (BLE/NFC)
    CU->>CU: Analyze Data with AI Algorithm
    CU->>VS: Send Optimized Control Commands (Suction Strength, Frequency)
    CU->>SC: Send Haptic Feedback Commands (Jaw Adjustment)
    SC->>M: Haptic Actuator Engagement
    CU->>CU: Log Procedure Data & Maintenance Alerts
    SC->>CU: RFID Tag Scan (Inventory Mgmt)

---

Derivative 1.5: The "Inverse" or Failure Mode - Low-Power, Manual-Assist Mouthpiece with Safety Relief

• Enabling Description: This version is designed for scenarios where active suction is unavailable or undesired, serving primarily as a cheek retractor and bite block with passive fluid channeling. The main body is formed from a translucent, low-durometer silicone (shore hardness 20A) to maximize patient comfort and reduce tissue stress. The "perforations" are replaced by larger, gravity-fed channels (5 mm diameter) that direct fluid towards a collection pouch instead of an active suction source. The wave-like structure features very low-profile, smooth undulations (crest height 0.5 mm) to provide minimal contact points, preventing adhesion of the walls and guiding fluid flow passively. The "suction connector" is re-engineered as a simple, non-occlusive drain port with a one-way valve that prevents backflow into the oral cavity but does not connect to a vacuum. It includes an integrated manual bulb pump, allowing a dental assistant to intermittently squeeze for low-level, manual suction when needed, without an electrical system. The mouth prop retains its function but is designed to compress safely under excessive force, incorporating a shear-sensitive region that detaches cleanly rather than causing undue stress on teeth.

graph TD
    A[Patient Mouth] --> B(Main Body - Passive Flow)
    B --> C(Gravity Channels)
    C --> D[Drain Port with One-Way Valve]
    D --> E((Collection Pouch))
    ManualIntervention(Manual Bulb Pump) -- Intermittent Suction --> D
    B -- Retraction & Bite Block --> F[Cheek Retractor]
    B -- Bite Block --> G[Mouth Prop - Shear Sensitive]
    G -- Excessive Force --> H{Detached Safety Element}

---

Core Claim 11 Derivatives

Claim 11 (Summary): Similar to Claim 1, but explicitly states the first and second walls of the main body remain spaced apart for a distance within the cheek retractor portion before being connected.

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Derivative 11.1: Material & Component Substitution - Shape Memory Alloy for Adaptive Spacing

• Enabling Description: The isolation mouthpiece is primarily constructed from a biocompatible silicone. However, the first and second walls within the cheek retractor portion incorporate embedded strands (0.2 mm diameter) of a Nitinol (Nickel-Titanium) shape memory alloy. These Nitinol strands are pre-programmed to maintain a specific "spaced apart" configuration at body temperature (37°C), ensuring the walls do not collapse and maintain fluid pathways. Upon insertion into the mouth, the Nitinol transitions to its austenitic phase, actively expanding to create and maintain the required spacing, which can be precisely controlled by the alloy's composition and heat treatment. When removed and cooled, the Nitinol returns to its martensitic phase, allowing for greater flexibility and ease of cleaning or storage. The specific "distance" for spacing can be varied by adjusting the geometry and activation temperature of the Nitinol components.

stateDiagram
    direction LR
    [*] --> RoomTemperature : Mouthpiece at ambient temp
    RoomTemperature --> MartensiticPhase : Nitinol is flexible
    MartensiticPhase --> OralCavityInsertion : Mouthpiece inserted
    OralCavityInsertion --> BodyTemperature : Heats up to 37°C
    BodyTemperature --> AusteniticPhase : Nitinol activates
    AusteniticPhase --> SpacedWalls : Walls actively maintain separation
    SpacedWalls --> OralCavityRemoval : Mouthpiece removed
    OralCavityRemoval --> RoomTemperature

---

Derivative 11.2: Operational Parameter Expansion - Variable-Geometry Spacing via Electroactive Polymers

• Enabling Description: The first and second walls within the cheek retractor portion are made of a flexible, medical-grade silicone integrated with localized layers of electroactive polymer (EAP) actuators, specifically dielectric elastomer actuators (DEAs). These DEAs are strategically patterned to allow for dynamic, electronically controlled adjustment of the spacing between the walls. A micro-controller embedded in the suction connector provides variable voltage (0-1 kV) to the EAP layers, causing them to deform and precisely control the "distance" between the walls, from 0.5 mm (minimum flow) to 5 mm (maximum flow). This allows a dental professional to adapt the mouthpiece's internal geometry in real-time based on the volume and type of fluid requiring evacuation. The system can be preset for different procedures or controlled via a wireless interface for fine-tuning during operation.

flowchart TD
    A[Micro-controller] --> B{DEA Actuators}
    B -- Apply Voltage --> C[Electroactive Polymer Layers]
    C -- Deformation --> D[Variable Wall Spacing]
    D -- Controls --> E(Fluid Flow Rate)
    F[Wireless Interface] --> A
    G[Pre-set Procedures] --> A

---

Derivative 11.3: Cross-Domain Application - Automated Cable Management System (Robotics)

• Enabling Description: The principle of "spaced apart walls" within the cheek retractor portion is applied to a flexible conduit for automated cable management in robotic systems, particularly for multi-jointed arms where cables must flex without tangling or pinching. The "main body" becomes a flexible cable housing, and the "first" and "second" walls are inner and outer surfaces of this housing. Within the flexible "cheek retractor portion" (which is now a bendable joint section of the cable housing), a series of internal, compliant fins (made of a self-lubricating polymer like PTFE) are arranged to maintain precise separation between individual data and power cables. These fins are designed to remain spaced apart even when the conduit is bent, preventing internal cable friction, wear, and signal interference. The fins' geometry (e.g., rounded edges as in the patent) ensures smooth movement and prevents damage to the cables. The "suction connector" becomes a mounting point for the conduit, with a locking mechanism that secures it to the robot's structure.

graph TD
    A[Robot Arm] --> B[Cable Conduit]
    B -- Contains --> C{Individual Cables}
    B -- Flexible Joint Section --> D[Conduit with Internal Fins]
    D -- Fins maintain --> E{Spaced Apart Cables}
    E -- Prevents --> F[Friction, Wear, Interference]
    B -- Mounts via --> G[Mounting Point]

---

Derivative 11.4: Integration with Emerging Tech - Haptic Feedback for Optimal Oral Cavity Spacing

• Enabling Description: The mouthpiece integrates micro-actuators (e.g., piezoelectric haptic drivers) within the first and second walls of the cheek retractor portion. These actuators are connected to a force sensor array (e.g., resistive flex sensors) distributed along the inner surfaces of the mouthpiece, which detect contact pressure against the oral tissues (cheeks, tongue, gingiva). An AI algorithm processes the force sensor data to determine if the "spaced apart" configuration of the walls in the cheek retractor is optimal for fluid evacuation and patient comfort. If the spacing is suboptimal (e.g., walls are collapsing or exerting excessive pressure), the system provides localized haptic feedback through the micro-actuators. This feedback is subtle vibrations or gentle pulses, guiding the patient to slightly adjust their jaw or cheek position to achieve the ideal intraoral geometry, without explicit verbal instructions. The system includes a wireless interface for real-time monitoring by the dental professional.

sequenceDiagram
    participant M as Mouthpiece (Force Sensors, Haptic Actuators)
    participant AI as AI Algorithm (External)
    participant DP as Dental Professional (Wireless Monitor)

    M->>AI: Real-time Force Sensor Data
    AI->>AI: Evaluate Wall Spacing & Pressure Profile
    AI->>M: Send Haptic Feedback Commands (if suboptimal)
    M->>M: Haptic Actuators Generate Feedback
    Patient->>M: Subtly Adjusts Position (Guided by Feedback)
    AI->>DP: Display Real-time Spacing Metrics

---

Derivative 11.5: The "Inverse" or Failure Mode - Non-Retracting, Tongue-Depressing Mouthpiece

• Enabling Description: This mouthpiece is designed to not actively retract the cheek or maintain large open spacing in the cheek retractor area, but rather to gently depress the tongue and provide a stable bite block. The "first" and "second" walls within the cheek retractor portion are designed to be minimally spaced (e.g., 0.5 mm apart) and semi-rigid, effectively forming a narrow, tongue-depressing flange rather than a wide fluid channel. This reduced spacing is maintained by a series of thin, flexible silicone membranes spanning the gap, which offer structural integrity but no active retraction. The mouth prop is oversized and soft, acting primarily as a comfortable bite block. The "suction connector" is present but adapted to a very low-flow saliva ejector tip, designed for minimal, passive collection of pooled saliva rather than high-volume aspiration. The goal is patient comfort and tongue control during non-invasive procedures (e.g., fluoride application, X-rays) where aggressive isolation or suction is not required.

graph TD
    A[Patient Oral Cavity] --> B(Mouthpiece - Non-Retracting)
    B -- Minimal Spacing (0.5mm) --> C[Semi-Rigid Walls with Flexible Membranes]
    C --> D{Tongue Depression}
    B -- Oversized, Soft --> E[Mouth Prop - Bite Block]
    B --> F[Low-Flow Saliva Ejector]
    F --> G((Saliva Collection))

---

Core Claim 20 Derivatives

Claim 20 (Summary): A mouthpiece with a main body (first/second walls defining interior, narrower second end, second wall with crests/troughs, contact points not attached to first wall, gaps for fluid, third connecting wall), and a cheek retractor connected to main body.

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Derivative 20.1: Material & Component Substitution - Bio-Absorbable Polymer with Dissolvable Bridge Structure

• Enabling Description: The entire mouthpiece is fabricated from a bio-absorbable polymer, such as polylactic acid (PLA) or polycaprolactone (PCL), using 3D printing techniques. This allows for customized shapes and temporary use. The "crests" and "troughs" of the wave-like structure on the interior surface of the second wall are formed from a rapidly dissolvable polymer (e.g., a soluble polyvinyl alcohol composite). These dissolvable crests provide initial contact points with the first wall during insertion and setup, ensuring proper initial spacing. Once exposed to oral fluids for a predetermined period (e.g., 5-10 minutes), the crests dissolve, thereby increasing the "gaps" (troughs) for fluid passage and reducing contact friction, optimizing long-term fluid flow and patient comfort during extended procedures. The contact points are explicitly not attached to the first wall, facilitating the dissolution and dynamic change in internal geometry.

stateDiagram
    direction LR
    [*] --> InitialState : Mouthpiece inserted
    InitialState --> CrestsIntact : Initial spacing & contact
    CrestsIntact --> FluidExposure : Oral fluids present
    FluidExposure --> CrestsDissolving : Polymer begins to dissolve
    CrestsDissolving --> IncreasedGaps : Fluid flow improves, friction reduces
    IncreasedGaps --> DissolvedCrests : Optimal long-term spacing
    DissolvedCrests --> ProcedureCompletion : Operation finished

---

Derivative 20.2: Operational Parameter Expansion - Multi-Frequency Acoustic Wave Fluid Agitation

• Enabling Description: The "second wall" of the main body is fabricated with an embedded array of miniature ultrasonic transducers (e.g., piezoelectric micro-emitters). These transducers are activated at varying frequencies (e.g., 20 kHz to 1 MHz) and low power levels (0.1-1 W) to generate acoustic waves within the interior space of the main body. The purpose is to agitate and fluidize highly viscous or particulate-laden oral fluids and debris, preventing sedimentation and facilitating their movement through the "gaps" (troughs) of the wave-like structure towards the suction connector. The "crests" are designed with specific acoustic impedance properties to reflect or absorb certain frequencies, creating optimized flow patterns. The "contact points" are non-attached to allow for micro-vibrations of the first wall, further assisting in dislodging material.

graph TD
    A[Ultrasonic Transducers] -- Emit Acoustic Waves --> B{Interior Space}
    B -- Agitates --> C(Viscous Fluids / Particulate Debris)
    C --> D[Wave-like Structure Troughs]
    D --> E((Suction Connector))
    B -- Micro-vibrates --> F[First Wall (Non-Attached Contact)]
    A[Frequency & Power Control] --> A

---

Derivative 20.3: Cross-Domain Application - Bio-Reactors for Cell Culture Fluid Management

• Enabling Description: The mouthpiece design is adapted for fluid management within miniature bioreactors used for sensitive cell cultures. The "main body" forms a reaction chamber, with the "first wall" being the outer housing and the "second wall" being an internal, porous scaffold for cell adhesion. The "crests" on the interior surface of the scaffold provide optimized contact points for cells while maintaining "gaps" (troughs) that act as micro-channels for the precise flow of nutrient media and waste products. These contact points are not attached to the outer housing, allowing the internal scaffold to be easily separated or gently agitated for cell harvesting or media exchange without disrupting the outer chamber. The "third wall" connects the scaffold to the chamber, providing structural stability. The "cheek retractor portion" is repurposed as a flexible connection port for tubing, facilitating sterile media input and output from the bioreactor.

classDiagram
    class Bioreactor {
        +Reaction Chamber
        +Internal Porous Scaffold
        +Micro-channels (gaps)
        +Flexible Connection Port
    }
    class ReactionChamber {
        -Outer Housing (First Wall)
        -Internal Scaffold (Second Wall)
    }
    class InternalScaffold {
        -Crests (Cell Contact Points)
        -Troughs (Micro-channels)
        -Not attached to Outer Housing
    }
    class ConnectionPort {
        -Flexible tubing interface
    }

    Bioreactor "1" -- "1" ReactionChamber : contains
    ReactionChamber "1" -- "1" InternalScaffold : houses
    ReactionChamber "1" -- "1" ConnectionPort : interfaces
    InternalScaffold "1" -- "N" CellContactPoints : provides
    InternalScaffold "1" -- "N" MicroChannels : enables flow

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Derivative 20.4: Integration with Emerging Tech - Dynamic Biometric Feedback and Personalization

• Enabling Description: The mouthpiece integrates an array of biometric sensors within the "main body" and "cheek retractor portion." These include:
  • Salivary Cortisol Sensors: Disposable electrochemical sensors in the troughs to measure stress levels via salivary cortisol.
  • Jaw Muscle Electromyography (EMG) Sensors: Electrodes embedded in the mouth prop and cheek retractor to monitor jaw clenching and muscle activity.
  • Intraoral Camera: A miniature camera (e.g., 1 mm diameter) embedded in the first wall, providing visual feedback of the oral cavity and ensuring the "contact points" of the wave-like structure are effectively separating the walls.
    An AI system analyzes this real-time biometric data. Based on the patient's stress levels or excessive clenching, the AI can trigger adaptive adjustments. For instance, it can signal the dental professional to pause, or, if the mouthpiece includes an active element (from other claims), it could adjust a mild sedative delivery or initiate calming audio feedback through integrated micro-speakers (not explicitly in this claim, but a plausible add-on). The "contact points" not attached to the first wall allow for subtle, AI-controlled micro-adjustments in pressure distribution by adjusting material stiffness through localized heating or cooling elements. The system personalizes the dental procedure experience based on patient physiological responses.

sequenceDiagram
    participant M as Mouthpiece (Biometric Sensors, Camera)
    participant AI as AI System (External)
    participant DP as Dental Professional (Monitor)
    participant P as Patient

    M->>AI: Transmit Salivary Cortisol, EMG, Video
    AI->>AI: Analyze Biometric Data (Stress, Clenching, Contact Efficacy)
    AI->>DP: Alert DP (e.g., "Patient Stress High")
    AI->>AI: (Optional) Initiate Calming Protocol (e.g., Audio, Micro-adjustment)
    AI->>M: (Optional) Command Localized Stiffness/Pressure Adjustment
    DP->>P: Intervene / Adjust Procedure

---

Derivative 20.5: The "Inverse" or Failure Mode - Diagnostic-Only, Low-Interference Mouthpiece

• Enabling Description: This mouthpiece is designed exclusively for non-invasive intraoral diagnostics, minimizing interference with natural oral function. The "main body" and "cheek retractor portion" are constructed from an ultra-thin, highly flexible, transparent medical-grade film (e.g., 50 µm thick silicone film), allowing for minimal bulk and maximum visibility. The "first" and "second" walls are nearly collapsed, with the "crests" and "troughs" of the wave-like structure reduced to minute, almost imperceptible surface textures (e.g., 50 µm height variations) that are primarily for tactile feedback during manufacturing alignment and not for active fluid management. There is no fluid suction capability; the internal space is purely for accommodating diagnostic probes or imaging elements (e.g., an intraoral OCT scanner, pH probes for specific areas). The "contact points" being non-attached ensures that the thin film walls do not create any significant obstruction or pressure points that could alter diagnostic readings or patient comfort. The "third wall" is extremely pliable, further reducing interference.

graph TD
    A[Patient Oral Cavity] --> B(Mouthpiece - Diagnostic Film)
    B -- Ultra-thin, Transparent --> C[First & Second Walls]
    C -- Minimal Texture --> D{Reduced Crests/Troughs}
    D -- No Active Suction --> E[Interior Space (for Probes)]
    F[Diagnostic Probe / Imaging Element] -- Inserted into --> E
    B -- Flexible --> G[Cheek Retractor (Low Interference)]

---

Combination Prior Art Scenarios

Here are three scenarios where the technology of US12290418 (an intraoral device with suction, cheek retraction, and mouth prop) could be combined with existing open-source standards to create new prior art.

1. Integration with DICOM (Digital Imaging and Communications in Medicine) Standard for Dental Imaging Workflows:

   • Scenario: A version of the US12290418 mouthpiece (e.g., Derivative 1.4 with IoT sensors and AI) is enhanced with an integrated, miniature intraoral camera and/or a spectroscopic sensor array. The real-time visual and chemical data captured by these sensors within the oral cavity (e.g., during a dental procedure) is processed by the AI control unit. This processed data (e.g., images, spectroscopic readings, annotations of areas requiring attention due to fluid buildup or tissue anomalies) is then automatically formatted and transmitted to the dental clinic's imaging system using the DICOM standard. This allows for the seamless integration of real-time intraoral data into the patient's electronic health record, alongside X-rays and other diagnostic images, enabling AI-driven diagnostics and procedural monitoring.
   • Enabling Description: The mouthpiece features an integrated 2-megapixel CMOS camera (2x2x2 mm) on the anterior wall of the main body, capable of streaming 1080p video, and a near-infrared (NIR) spectroscopic array on the posterior wall for tissue analysis. The on-board AI processing unit in the suction connector (via a low-power ARM processor) performs image stabilization, anomaly detection (e.g., caries, inflammation via color/spectral shifts), and object recognition (e.g., tooth identification). This processed data, including video streams, static images of anomalies, and spectral data cubes, is then encapsulated into DICOM Part 3 (Information Object Definitions) and communicated over the network using DICOM Part 8 (Network Communication Support for Message Exchange) to a PACS (Picture Archiving and Communication System) server, identifiable by a unique DICOM C-STORE SCU/SCP implementation. The mouthpiece’s RFID (from Derivative 1.4) can auto-populate patient ID in the DICOM metadata.

2. Compatibility with FHIR (Fast Healthcare Interoperability Resources) Standard for Automated Procedure Logging:

   • Scenario: The US12290418 mouthpiece, particularly with its hands-free suction and isolation capabilities, performs various procedural steps. An extended version integrates sensors (e.g., force sensors for bite registration, flow sensors for suction duration/volume, timer) to automatically log the initiation and completion of procedural phases. This procedural data (e.g., "Mouthpiece inserted," "Suction activated for 15 minutes," "Mouth prop engaged," "Cheek retracted") is then packaged into FHIR resources, specifically "Observation" or "Procedure" resources. These FHIR resources are transmitted wirelessly from the mouthpiece's control unit to the clinic's Electronic Health Record (EHR) system, providing an accurate, automated audit trail of the dental procedure, improving billing accuracy, and reducing manual charting time.
   • Enabling Description: The mouthpiece's internal microcontroller logs events such as mouthpiece insertion (detected by pressure sensors on the cheek retractor), suction activity (from vacuum line pressure transducer), and mouth prop engagement (from mechanical switch). Each logged event is timestamped. The microcontroller generates FHIR Observation resources (e.g., Observation.code = {system: "http://snomed.info/sct", code: "302890007", display: "Suction applied"}), including Observation.valueQuantity for duration or volume, and Observation.subject.reference linking to the patient's FHIR ID. These resources are transmitted via HTTPS POST requests to a FHIR server endpoint (e.g., https://ehr.example.com/fhir/Observation) using secure authentication protocols (e.g., OAuth 2.0 as per SMART on FHIR). The suction connector's RFID can identify the mouthpiece, which can be linked to a practitioner's ID for accountability.

3. Adherence to MODBUS/TCP for Industrial Dental Equipment Control and Monitoring:

   • Scenario: In a highly automated dental facility or a teaching institution with centralized control over dental units, the US12290418 mouthpiece is equipped with an interface adhering to the MODBUS/TCP industrial communication standard. This allows the mouthpiece's various features (e.g., suction on/off, suction intensity adjustment, mouth prop force setting if adjustable, monitoring of fluid levels within the mouthpiece) to be controlled and monitored by a central Programmable Logic Controller (PLC) or supervisory control system. This enables precise, synchronized operation with other dental equipment (e.g., drills, irrigation systems) in a high-volume, standardized environment.
   • Enabling Description: The suction connector portion includes an Ethernet port (or a wireless bridge acting as an Ethernet client) implementing the MODBUS/TCP protocol on port 502. The mouthpiece's internal control logic exposes its operational parameters and sensor readings (e.g., suction motor RPM, valve state, fluid detection, mouth prop pressure) as MODBUS registers. For example, a holding register at address 40001 could control suction intensity (0-100%), and an input register at 30001 could provide a boolean for "fluid detected." A PLC connected to the network can read these input registers and write to holding registers, integrating the mouthpiece's operation into a larger, automated dental workflow, enabling centralized control, diagnostics, and preventive maintenance based on real-time operational data.