Research report
A research report is the sourced material a domain
dossier is synthesized from — generated on a plan and a cadence, one topic per file.
A report carries no confidence tags. Its bracketed markers say who might have
an incentive to shade a line; none of them says anyone checked it. To reach a score, a line has
to be drafted onto a candidate as unverified and pass the Verifier or the
Corroborator, like everything else.
Section ip-patent-landscape · Version 2026-09-13 · Cadence quarterly · Evidence class 1 registry · Sources 7 · Supersedes none
Domain: cross-cutting · Scope: Public keyword and assignee-name search of Google Patents (patents.google.com) and USPTO (United States Patent and Trademark Office) patent PDFs reachable through search, covering US-granted patents and US-published applications only. Assignees searched: Smith & Nephew, T.J. Smith and Nephew, BlueSky Medical, Solventum/3M, plus open keyword searches not limited to any assignee. No PATENTSVIEW_API_KEY is set, so the `patent` connector could not be used; no formal CPC-classification-restricted browse (A61M1/90-A61M1/98) was run against USPTO Patent Public Search, which was not reachable as an interactive query surface via WebSearch/WebFetch. Excludes non-US jurisdictions, unpublished/pending applications not surfaced by keyword search, and any professional (paid) patent-search platform.
Sourcing: Every line rests on one primary patent document (the granted patent or published application itself, read via Google Patents) — each fact is [single-source] because no second independent source exists for what a patent's own claims or legal-status field say; nothing here was cross-checked against a second, independent registry query.
A keyword and assignee search of Google Patents surfaced three live US patents assigned to Smith & Nephew entities that claim structural elements of canister-free/absorbent negative-pressure wound therapy (NPWT (negative-pressure wound therapy)), and one live US patent assigned to a different party, Mölnlycke Health Care AB, claiming a superabsorbent NPWT dressing structure. None of the independent claims retrieved recites a species or human-only limitation. No US patent surfaced in this search claims an adhesive chemistry formulated for fur-bearing or hair-bearing animal skin, or a limb-conforming NPWT interface specific to veterinary use; the closest veterinary-specific hit is a mechanical, non-adhesive animal wound wrap that expired in 2024. This is a public keyword search, not a professional freedom-to-operate opinion, and the gaps below name what it could not reach.
_Baseline (v1). No prior version; this establishes the starting point for future diffs._
US Patent 9,061,095 B2, "Wound dressing and method of use," assigned to Smith and Nephew PLC, filed April 21, 2011 (priority April 27, 2010), granted June 23, 2015, is listed active, expiring October 27, 2033 [1] [single-source]. Claim 1 recites a wound treatment apparatus with a wound-contact layer, a transmission layer, an absorbent layer, a gas-impermeable moisture-vapor-permeable cover layer, and a suction port with a filter element [1] [single-source]. The specification underlies the PICO (population, intervention, comparator, outcome) dressing family [1] [single-source].
US Patent 11,395,870 B2, "Negative pressure wound therapy apparatuses and methods for using the same," assigned to T.J Smith and Nephew Ltd, filed February 15, 2018 (priority February 15, 2017), granted July 26, 2022, is listed active, expiring January 22, 2039 [2] [single-source]. Claim 1 recites a controller that detects, via a switch at the connector port, whether a canister or a canisterless wound dressing is attached, and adjusts operation accordingly [2] [single-source] — a claim over the pump's mode-switching logic rather than over drape or adhesive chemistry.
US Patent 12,453,658 B2, "Absorbent Negative Pressure Wound Therapy Dressing," assigned to Smith and Nephew PLC, filed August 16, 2021 (priority December 30, 2015), granted October 28, 2025, is listed active, expiring January 11, 2040 [3] [single-source]. Claim 1 recites a backing layer with an opening, adhesive or glue on the backing layer's upper surface, and an absorbent layer between the backing layer and the wound site; the specification names the PICO dressing as a canister-less system with "a superabsorbent layer beneath a backing layer" [3] [single-source]. Neither claim 1 nor the summary retrieved recites a human or species limitation.
US Patent 12,447,258 B2, "Negative pressure wound therapy (NPWT) dressing," assigned to Mölnlycke Health Care AB, filed May 24, 2021 (priority May 25, 2020), granted October 21, 2025, is listed active, expiring September 26, 2042 [4] [single-source]. Claim 1 recites a backing layer, an adhesive skin-contact layer, and an absorbent structure with superabsorbent polymer particles at 10-20 mg/cm²; unlike the Smith & Nephew family, this dressing is explicitly designed to connect to a remote fluid collection means (a canister) rather than being canister-free [4] [single-source].
Three keyword-searched patents touch adjacent ground but are each a different physical solution. US Patent 7,004,922 B1, "Animal wound wrap for holding a primary wound dressing on an animal wound," is listed expired (fee-related) as of April 9, 2024 [5] [single-source]; it explicitly names fur ("a portion of the animal's fur is shown shaved") and states its purpose as eliminating adhesive entirely, via a hook-and-loop stretchable wrap [5] [single-source]. US Patent 9,833,361 B2, "Wound and Bandage Protection System and Method," is listed active, expiring June 29, 2032, but is a human joint-bandage mechanical protector unrelated to NPWT or fur [6] [single-source]. US Patent 11,260,164 B2, "Negative pressure wound therapy dressing and related apparatus," assigned to Genesis Medical Devices LLC, is listed active, expiring December 4, 2038, and claims a compressible, diameter-adjustable NPWT connector/adaptor — a dressing-interface patent, but for human use and not fur- or limb-shape-specific [7] [single-source]. No patent retrieved in this search claims an adhesive chemistry for hair-bearing skin or a limb-conforming NPWT interface layer for animal use.
[1] US9061095B2 — Wound dressing and method of use — Smith and Nephew PLC (granted 2015-06-23; accessed 2026-09-13). US9061095B2 — https://patents.google.com/patent/US9061095B2/en [federal-registry] [2] US11395870B2 — Negative pressure wound therapy apparatuses and methods for using the same — T.J Smith and Nephew Ltd (granted 2022-07-26; accessed 2026-09-13). US11395870B2 — https://patents.google.com/patent/US11395870B2/en [federal-registry] [3] US12453658B2 — Absorbent Negative Pressure Wound Therapy Dressing — Smith and Nephew PLC (granted 2025-10-28; accessed 2026-09-13). US12453658B2 — https://patents.google.com/patent/US12453658 [federal-registry] [4] US12447258B2 — Negative pressure wound therapy (NPWT) dressing — Mölnlycke Health Care AB (granted 2025-10-21; accessed 2026-09-13). US12447258B2 — https://patents.google.com/patent/US12447258B2/en [federal-registry] [5] US7004922B1 — Animal wound wrap for holding a primary wound dressing on an animal wound — Davis, Brian MR and Shesol, Barry F. DR (granted 2006-02-28; accessed 2026-09-13). US7004922B1 — https://patents.google.com/patent/US7004922 [federal-registry] [6] US9833361B2 — Wound and Bandage Protection System and Method — Jennifer DiGrazia (granted 2017-12-05; accessed 2026-09-13). US9833361B2 — https://patents.google.com/patent/US9833361B2/en [federal-registry] [7] US11260164B2 — Negative pressure wound therapy dressing and related apparatus — Genesis Medical Devices LLC (granted 2022-03-01; accessed 2026-09-13). US11260164B2 — https://patents.google.com/patent/US11260164B2/en [federal-registry]
Well established: Nothing in this report rests on two or more independent, non-affiliated primary sources — see Thin.
Thin: Every fact in section 3 carries [single-source]. Each is the patent's own document (claims, specification, and Google Patents' legal-status field), read once via WebFetch, with no second independent registry query run against it. A typed lookup through the patent connector, had PATENTSVIEW_API_KEY been set, would not itself have supplied a second independent source — it would still be reading the same underlying USPTO record — so this ceiling is structural to patent facts, not a shortfall specific to this pass.
Rescoped from class 3: None. Both manifest questions — which patents are live and what they claim, and whether prior art blocks a given claim scope — are class-1 registry shapes as asked; neither required rescoping.
Out of scope: No formal CPC-classification-restricted browse of A61M1/90 through A61M1/98 was run; USPTO Patent Public Search (ppubs.uspto.gov) is an interactive, session-based search tool and was not reachable as a query surface via WebSearch/WebFetch, so all results here come from Google Patents keyword and assignee-name search instead. Non-US patents and applications (EP, WO family members of the US patents above), unpublished/pending US applications, and any paid professional patent-search platform are all out of scope per the manifest row and were not queried.
Not searched vs. not found: Live Smith & Nephew canister-free/superabsorbent NPWT patents — found, three [1][2][3]. A live patent held by a different assignee in the same structural space — found, one [4]. A US patent claiming adhesive chemistry compatible with fur/hair-bearing animal skin — not found across several keyword searches ("fur" + adhesive + drape + wound; veterinary + NPWT + adhesive); the nearest hit avoids adhesive entirely [5]. A US patent claiming a limb-conforming NPWT interface specific to veterinary/animal use — not found. Continuation, divisional, or foreign-filed family members of [1]-[4] that might carry differently scoped claims — not searched, beyond what Google Patents' own family links surfaced incidentally. Solventum/3M and KCI-assigned NPWT patents specifically — not found in this pass; searches under those assignee names returned only product and litigation-history material, not a patent claiming canister-free/superabsorbent structure, so this is a gap in the search rather than a finding that no such patent exists.
[inference] None of the three Smith & Nephew claims examined [1][2][3] recites a species or human-only limitation, which suggests that a fur-compatible-adhesive, limb-conforming NPWT product built on the same general canister-free, layered-dressing architecture (backing layer, adhesive, absorbent layer, suction port; or canister/canisterless mode-detection logic) would need to be weighed against these claims regardless of the patient's species. Separately, none of the patents retrieved claims an adhesive composition for hair-bearing skin or a limb-shape-conforming interface as such, which may leave chemistry-specific and shape-specific claim scope open — but this is synthesis from an incomplete public search, not a legal freedom-to-operate opinion, and should not be treated as a finding that such scope is actually available to file.
| Proposition | Evidence class | Resolvable identifier | Dossier section |
|---|---|---|---|
| US Patent 9,061,095 B2 (Smith and Nephew PLC), filed April 21, 2011, is listed active with an expiration date of October 27, 2033, and claim 1 recites a wound dressing with wound-contact, transmission, and absorbent layers and a suction port | 1 registry | US9061095B2 | technology |
| US Patent 11,395,870 B2 (T.J Smith and Nephew Ltd) is listed active with an expiration date of January 22, 2039, and claim 1 recites a controller that detects whether a canister or canisterless dressing is attached | 1 registry | US11395870B2 | technology |
| US Patent 12,453,658 B2 (Smith and Nephew PLC) is listed active with an expiration date of January 11, 2040, and claim 1 recites a backing layer, an opening, adhesive on the backing layer, and an absorbent layer, without a species limitation | 1 registry | US12453658B2 | technology |
| US Patent 12,447,258 B2 (Mölnlycke Health Care AB) is listed active with an expiration date of September 26, 2042, and claims a canister-connected (not canister-free) NPWT dressing with superabsorbent particles at 10-20 mg/cm² | 1 registry | US12447258B2 | technology |
| US Patent 7,004,922 B1, an animal wound wrap naming fur explicitly, is listed expired (fee-related) as of April 9, 2024, and claims a hook-and-loop mechanical wrap that avoids adhesive | 1 registry | US7004922B1 | technology |
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