Invalidity dossier
US 11744691
System for treating embolism and associated devices and methods
Current assignee: Stryker Corp
Added 9/23/2026, 5:36:12 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 11744691 B2
Title: System for treating embolism and associated devices and methods
Patent number: US11744691B2
Application number: US18/180,016 (also published as US20230218383A1)
Filing date: 2023-03-07
Publication/grant date: 2023-09-05
Priority date (as listed): 2018-08-13
Anticipated expiration (as listed): 2039-08-08
Legal status (as listed): Active
Current/original assignee: Inari Medical, Inc.
Inventors: Ben Merritt; Jacqueline Macias; Brian Michael Strauss; Thomas Tu
Classification: A61B17/12 (and related subgroups under A61B17/12022, 17/12099, 17/12109, 17/12110)
Purpose: The patent is directed to a system for treating embolism. From the prior-art keywords listed in the source — "catheter," "aspiration," "chamber," "valve," "syringe" — the subject matter concerns catheter-based aspiration devices for removing material from a blood vessel, involving a chamber and valve arrangement and a syringe.
Plain-language scope: As reflected in the title, the patent concerns a system for treating embolism plus associated devices and methods. The listed classification falls under surgical instruments for occluding by internal devices, characterised by location in a blood vessel. Per the source's own framing, the claimed subject matter appears to relate to a catheter/aspiration system that draws embolic material from the vasculature using an aspiration chamber, valve, and syringe.
Source: https://patents.google.com/patent/US11744691/en
What the excerpt does not establish:
- The actual text of any claim, the independent claim(s), or claim limitations — claims are not reproduced in the supplied excerpt.
- The detailed description, drawings, or specific embodiments beyond prior-art keywords.
- The scope of protection, enforceability, or validity.
- The legal significance of the listed litigation, PTAB, or reassignment entries.
The excerpt also omits the body text; no omissions have been inferred or corrected. The priority date, expiration date, and legal status are expressly identified in the source as assumptions, not legal conclusions. No litigation, ownership transfer, validity, or prior-art analysis is offered here, per scope.
(≈300 words)
Generated 10/1/2026, 9:43:28 PM
Cases on file (0)
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Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
No PTAB proceedings on file. This patent has not been challenged via IPR, PGR, or CBM. The absence is itself a signal — well-asserted patents eventually attract IPRs. The LLM analysis below may surface filings the ODP feed hasn’t indexed yet.
PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
Assignment history
Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.
Prior art
Earlier patents, publications, and products that may anticipate or render the claims unpatentable.
Obviousness
Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.
Extensions
Patent term adjustments, term extensions, continuations, divisionals, family members, and expiration dates.
Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.