Patent 11589969

Obviousness

Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.

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Obviousness

Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.

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Obviousness Analysis of US Patent 11589969 under 35 U.S.C. § 103

This analysis identifies combinations of prior art references that would render the independent claims (1, 16, 19) of US Patent 11589969 obvious to a person having ordinary skill in the art (PHOSITA) at the time of the invention (priority date: December 7, 2012). The motivation for combining these references stems from common design goals in dental devices, such as improving suction efficiency, isolation, stability, patient comfort, and reusability.

The US Patent 11589969 is a continuation of US application Ser. No. 14/100,323, which claims priority to US provisional application No. 61/734,939 filed on December 7, 2012. Several related patent applications (US20140212838A1, US20140212839A1, US20140212840A1, US20140212841A1) also claim priority from the same underlying provisional application and are considered part of the same patent family. Their disclosures, therefore, are available as prior art against the claims of US11589969 for obviousness purposes.

Person Having Ordinary Skill in the Art (PHOSITA): A PHOSITA in this field would likely be a dental professional (dentist, hygienist) or a biomedical engineer with experience in designing and manufacturing dental instruments and intraoral devices. They would understand the functional requirements for oral suction, isolation, and patient comfort, as well as common materials and manufacturing techniques for medical devices.

I. Combination for Core Features of Claims 1, 16, and 19 (Main Body, Pocket, Perforations, Suction Connector, Cheek Retractor, Bridge Structure)

This combination addresses the fundamental elements of the dental mouthpiece, including the main body's pocket structure, suction mechanism, cheek retraction, and the internal bridge for maintaining wall separation.

  • Primary Reference: WO2011014952A1 (University of Manitoba, published February 10, 2011)

    • Disclosure: WO'952 describes a "dental apparatus" including a "mouthpiece configured to fit within an oral cavity of a patient." The mouthpiece comprises an "anterior body and a posterior body joined at an apex," defining an "evacuation channel therebetween." Both the anterior and/or posterior bodies include "apertures extending therethrough and communicating with the evacuation channel" for fluid suction. The apparatus also includes a "bite block" and a "suction tube in fluid communication with the mouthpiece." [cite: The "Dental apparatus" patent, WO2011014952A1, 2011]
    • Application to Claims: This reference clearly teaches a main body configured as a pocket (evacuation channel) defined by two walls (anterior and posterior bodies) with perforations (apertures) in communication with an interior open space for suction. It also discloses a suction connector (suction tube) and a bite block.

  • Secondary Reference 1: US8911232B2 (Nguyen et al., issued December 16, 2014, priority December 7, 2012)

    • Disclosure: US'232, titled "Intraoral dental suction and isolation system," explicitly describes an intraoral device with a "main body" that includes a "lumen for receiving fluid via a plurality of openings," a "cheek retractor portion" coupled to the main body and configured to retract a patient's cheek, and a "suction connector" coupled to the main body to extract fluid. It further states that the "main body, the cheek retractor portion, the suction connector, and the bite block are integrally formed as a single piece of flexible and resilient material." [cite: The "Intraoral dental suction and isolation system" patent, US8911232B2, 2014]
    • Application to Claims: This reference clearly teaches the integration of a distinct cheek retractor portion with the main body and suction connector, and the manufacture from a single piece of flexible material.

  • Secondary Reference 2: US20140212838A1 (Incept, Inc., published July 31, 2014, priority December 7, 2012)

    • Disclosure: US'838A1, titled "Intraoral device with bridge," discloses that the "main body may further include an internal bridge structure on an interior surface to ensure that the anterior and posterior surfaces remain separated during suction." The full description of the present patent (US11589969B2) elaborates that this bridge structure is a wave-shaped protrusion integral with the posterior wall, not attached to the anterior wall, with crests providing contact points and troughs allowing fluid passage. This explicit teaching in a co-pending application from the same priority date is available as prior art against the claims of US11589969.
    • Application to Claims: This reference directly addresses the bridge structure for maintaining wall separation during suction, a key element of the independent claims.

  • Motivation to Combine:

    1. A PHOSITA would begin with the foundational mouthpiece design of WO2011014952A1, which provides an effective evacuation channel with apertures for suction.
    2. However, WO'952 does not explicitly detail a dedicated cheek retractor. A PHOSITA would recognize the benefits of improved oral isolation and hands-free operation in dental procedures. US8911232B2 clearly teaches the incorporation of a distinct "cheek retractor portion" and the advantages of a one-piece, flexible construction. It would be obvious for a PHOSITA to combine these features into the WO'952 device to enhance its isolation capabilities and simplify manufacturing. Both references operate in the same field and address similar problems in dental care.
    3. Once the flexible mouthpiece with an evacuation channel is established (from WO'952, augmented by US'232's cheek retractor), a PHOSITA would anticipate the common problem of flexible walls collapsing under suction, thereby impeding fluid flow. US20140212838A1 specifically presents the solution: an "internal bridge structure... to ensure that the anterior and posterior surfaces remain separated during suction." A PHOSITA would be strongly motivated to incorporate this known and effective solution into the combined device to maintain consistent and efficient suction, especially since US'838A1 is a related application from the same inventors and priority date, addressing an improvement to a very similar intraoral system. The wave-shaped design, providing both support and open channels for fluid, represents a predictable engineering choice for this function.

II. Obviousness of Additional Features (Dependent Claims and Specific Elements)

Building upon the core combination above, the following features, also detailed in co-pending applications with the same priority date or representing conventional design choices, would be obvious to a PHOSITA:

  • Perforations as a "mesh" (Claims 2, 4, 18):

    • Given that WO'952 and US'232 teach "apertures" or "plurality of openings" for suction, arranging these perforations in a "mesh" is an obvious design choice. A PHOSITA would understand that a mesh configuration optimizes fluid evacuation while preventing larger debris from entering the suction channel. This is a common and predictable engineering arrangement for filtration and suction surfaces in various fields, including dentistry.

  • Opening/Slit along a longitudinal axis on the first (anterior) wall (Claim 5):

    • Reference: US20140212840A1 (Incept, Inc., published July 31, 2014, priority December 7, 2012)
    • Disclosure: US'840A1 explicitly teaches an "intraoral device with slit," noting that "The main body portion may further include a slit along a longitudinal, central axis on the anterior wall." [cite: The "Intraoral device with slit" patent, US20140212840A1, 2014]
    • Motivation: The description of US11589969B2 notes that such a slit "may assist in capture and suction of water, saliva and debris, as well as assisting in cleaning and maintenance." These are desirable enhancements for an intraoral suction device. A PHOSITA would be motivated to incorporate such a feature from US'840A1 into the combined mouthpiece to improve debris capture and ease of cleaning, especially given its disclosure within the same patent family addressing similar device improvements.

  • Stability Bar (Claim 10):

    • Reference: US20140212839A1 (Incept, Inc., published July 31, 2014, priority December 7, 2012)
    • Disclosure: US'839A1, titled "Intraoral device with stability bar," teaches "an internal reinforcing or stability bar on an interior surface to ensure the main body retains its shape during suction and/or when a mouth prop is placed in a patient's mouth." [cite: The "Intraoral device with stability bar" patent, US20140212839A1, 2014]
    • Motivation: For a flexible mouthpiece designed to conform to the mouth, maintaining structural integrity and preventing unwanted deformation during use (particularly under strong suction or when a mouth prop is applied) is a known challenge. The stability bar provides this reinforcement, making it an obvious and desirable addition for a PHOSITA seeking to improve the robustness and reliability of the intraoral device.

  • Flexible, translucent, high heat-resistant, autoclavable silicone-based material (Claim 12):

    • Reference: US8911232B2 (Nguyen et al., 2014) explicitly mentions "flexible and resilient material." [cite: The "Intraoral dental suction and isolation system" patent, US8911232B2, 2014]
    • Motivation: Silicone is a widely recognized, commonly used, flexible, translucent, autoclavable, and high heat-resistant material in medical and dental devices. The choice of silicone for reusability, patient comfort, and effective sterilization (autoclavability) would be an obvious material selection for a PHOSITA designing a modern dental mouthpiece.

  • Detachable Mouth Prop (Claims 14, 15):

    • Reference 1: US4167814A (Schubert, 1979) - Mouth prop and oral evacuation device. [cite: US4167814A, 1979]
    • Reference 2: US20140212841A1 (Incept, Inc., published July 31, 2014, priority December 7, 2012)
    • Disclosure: US'841A1, titled "Intraoral device with detachable mouth prop," states that "the mouthpiece may be used with a mouth prop that may be attached to the suction connector portion" and describes an "external plug" on the suction connector portion that "may correspond to and serve to connect with an opening in the mouth prop." It further specifies that the mouth prop "may be made of thickened silicone material injection molded in a single piece." [cite: The "Intraoral device with detachable mouth prop" patent, US20140212841A1, 2014]
    • Motivation: The general concept of combining a mouth prop with an oral evacuation device is taught by Schubert. A PHOSITA would be motivated to integrate a mouth prop into the combined mouthpiece for enhanced hands-free operation and patient comfort. The detachability, as articulated in the present patent's description, allows for "different sizes of each may be mixed and matched as needed for a particular patient's mouth," offering valuable customization and flexibility. The specific plug/opening connection and one-piece injection molding for the mouth prop are predictable design choices for creating a robust, sterilizable, and user-friendly detachable component, as explicitly taught in US'841A1, which targets improvements for the same type of intraoral device.

In summary, the key elements of US11589969, including the perforated pocket main body, cheek retractor, suction connector, internal bridge structure, slit, stability bar, and detachable mouth prop, would have been obvious to a PHOSITA by combining the teachings of WO2011014952A1 and US8911232B2 with the further refinements disclosed in the co-pending family applications US20140212838A1, US20140212839A1, US20140212840A1, and US20140212841A1, all sharing the same priority date and addressing common problems and desired improvements in intraoral dental devices.

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