Negative pressure wound therapy for open, contaminated, or grafted distal-limb wounds in dogs and horses

This domain spans two species with meaningfully different wound biology and practice settings and a reader should not expect one blended figure to answer for both: canine distal-limb wounds are managed in general practice and small-animal referral surgery on a haired, mobile, chewable limb, largely as an inpatient-to-outpatient transition; equine distal-limb wounds are managed in equine hospitals and ambulatory field practice on a weight-bearing limb with a well-documented predisposition toward exuberant granulation tissue and prolonged, complicated second-intention healing, and NPWT use there is described mostly as an inpatient adjunct rather than a send-home device. Epidemiology (§1) and market players (§8) are written with species-split rows or subsections wherever a source supports one; where a source blends species or reports on humans only, that is stated rather than silently generalized. Read the thinness up front: no US federal dataset covers veterinary device epidemiology, pricing, or utilization at all (docs/research-lane-spec.md's stated veterinary-data limitation, confirmed again here), so §1 (epidemiology) and most of §6 (reimbursement) are genuinely thin and are reported as such rather than papered over. The human NPWT literature and FDA recall record for the human-labeled predicate devices (V.A.C., RENASYS, PICO) are the deepest, most reusable part of this file, because the candidate is explicitly positioned against exactly that canister-based incumbent design.

This file carries no confidence tags. Every line below is context with a source attached. To affect a score, a line must be copied into a candidate's ## Claims as unverified via engine/scripts/append_research_claims.py and pass the Verifier or Corroborator. See README.md in this directory.

Citation format: sources are numbered [N] at first use, reused for repeats, and listed in full in ## Sources at the end of this file.

1. Condition & epidemiology

as_of: 2026-08-27 · sources searched: connectors literature (queries: "canine distal limb degloving wound incidence," "dog traumatic wound emergency presentation incidence veterinary," "equine limb wound incidence trauma prevalence," "equine wound trauma UK veterinary practice prevalence VetCompass") · not searched: Banfield/Mars State of Pet Health, VetCompass US, the Veterinary Medical Database, AAEP/ACVS caseload reports — none reachable by any connector in this repo and none located by web search either, per the candidate's own claim 13 finding

This section is genuinely thin, and the thinness is itself the finding. No connector and no web search located a US (or any-country) incidence or prevalence figure specifically for "distal-limb wounds severe enough to warrant NPWT or free skin grafting" in dogs or horses. What PubMed returns instead for "dog traumatic wound incidence" is a run of single-institution retrospective case counts on unrelated trauma categories (stair falls, vehicular rollover, head trauma, zinc toxicosis) from the Journal of Veterinary Emergency and Critical Care's "retrospective evaluation: N cases" series and the ACVECC Veterinary Committee on Trauma registry reports — none of which reports wound-specific or distal-limb-specific counts. Equine queries return horseback-riding and racing injury epidemiology (falls, musculoskeletal injury), not wound incidence.

Gaps: this is the same gap candidate idea-002's own claim 13 already names — no US connector covers veterinary procedure volume (procedures is Medicare fee-for-service and structurally blind to animal procedures) — and this pass's literature and web searches did not surface a substitute. Not searched rather than not found for one thing only: UK VetCompass-style primary-care EHR studies specifically scoped to wound presentations (the diabetes-monitoring dossier [see veterinary-diabetes-glucose-monitoring.md] found VetCompass epidemiology for a different condition; a wound-specific VetCompass query was run here and returned nothing, which is recorded as found-and-negative, not unsearched).

2. Care pathway & clinical setting

as_of: 2026-08-27

The one directional finding this section can state with sources: in the largest equine case series located, NPWT was used as a days-to-weeks inpatient-adjunct therapy (mean application 11.5 days, system reset every ~4.5 days) rather than a send-home device, and over a quarter of the horses that were discharged were discharged before the treating team considered NPWT complete [9] — a site-of-service constraint this candidate's post-discharge, owner-managed design would need to engineer around specifically for the equine population, distinct from the canine population where send-home use is already described in the literature without that caveat [6].

Gaps: no source establishes what fraction of US general veterinary practices (versus referral/specialty practices) currently stock or offer any form of NPWT at all, typical visit or recheck frequency once a patient is discharged with a device, or staffing/throughput effects on either species' care pathway. Not searched beyond the case-series abstracts cited.

3. User groups & incentives

as_of: 2026-08-27

Gaps: no source separates veterinary-technician incentives from veterinarian incentives specifically for NPWT (as opposed to wound care generally); no source addresses clinic-side markup or margin on a rented or purchased NPWT system.

4. Standard of care & clinical evidence

as_of: 2026-08-27 · sources searched: connectors literature/literature-detail (canine and equine NPWT case-series and comparative-study queries listed in §10), one non-PubMed veterinary review page fetched directly · not searched: AAHA/ACVS wound management guidelines (no full-text guideline document located or fetched; not attempted this pass, distinct from the diabetes dossier's own 403-blocked AAHA attempt)

Read the fourth and fifth rows the same way candidate idea-002's own Verifier already reads them: both are this candidate's exact anatomical site and both report a negative or equivocal direction, not merely a caveat. Nothing here licenses reading the canine skin-graft feasibility result [6] as neutralizing that, since it is a different indication (grafted wounds, not general cutaneous or non-grafted distal-limb wounds) and has no comparator arm at all.

Verbatim, for anything load-bearing:

"Wounds treated with NPWT suffered significantly less complications (p = 0.008) and were significantly less septic during treatment (p = 0.016) than wounds treated with a foam dressing." — [5], PMID 25449799

"Application and maintenance of the portable device was technically easy and no major complications were encountered. Minor complications consisted of fluid accumulation in the evacuation tubing." — [6], PMID 27569833

"In 69% (n = 29) of the cases, healing was considered satisfactory at discharge. 26 % (n =

1. of horses were discharged whilst ideally NPWT should have been continued. 2 animals (n

= 2; 5%) were euthanized after surgery due to unrelenting pain." — [9], PMID 34670699

"the isolated use of NPWT (PICO® system) was not sufficient to stimulate the healing process, as the authors did not observe a reduction in wound size, indicating impaired healing" ... "recent reviews of the literature concluded that, to date, there is no solid evidence on best practices and many results are controversial." — [14], quoted as retrieved from the commentary's own text, describing a case series this dossier did not independently retrieve

Gaps: no canine or equine randomized controlled trial of NPWT versus conventional bandaging was located — every comparative canine/equine source above is retrospective, matched-pair, or a small controlled experiment, not an RCT. No source with a head-to-head canister-based-versus-canister-free comparison in either species was found. The Schnierer case series [14] was not independently retrieved or verified — recorded here as a secondhand description from a commentary, not as an appraised primary source.

5. Reference products — and why people stop using them

as_of: 2026-08-27 (built this pass) · sources searched: connectors literature/ literature-detail (queries in §10), connectors recalls --product-code OMP, connectors clearances --product-code OMP, connectors clearance-summary K211318, web search followed to vendor pages · not searched: MAUDE narratives (no connector in this repo, docs/backlog.md 1.9); veterinary-specific complaint/recall channel (none exists — no US federal dataset covers veterinary devices at all, stated plainly per this repo's known constraint)

The load-bearing section, worked hardest per the task brief. Three incumbents are relevant here: the practice being displaced (conventional bandaging), the canister-based human NPWT systems already on the market and occasionally used off-label or by rental in veterinary practice (3M/KCI V.A.C., Smith & Nephew RENASYS), and the canister-free single-use human NPWT system this candidate is explicitly positioned against and that is already being used off-label in dogs and horses (Smith & Nephew PICO).

Conventional bandaging (both species)

• What it is: the default, no-device standard of care for open and second-intention wounds; a practice, not a product.
• Price / what it realizes per unit: not established here.
• Evidence behind it: the comparator arm in every comparative study above [5][10]; canine bandage wounds took significantly longer to close than either NPWT or foam-dressing wounds in the one matched comparison found [5].
• Adoption: the historical and current default; not quantified as an installed base because it is a practice.
• Abandonment record — why people stop:

• Verbatim:

"Total time to wound closure was significantly shorter in Group C [foam] compared to Group A [bandage] (p = 0.02) and in Group B [NPWT] compared to Group C (p = 0.003)." — [5], PMID 25449799

Canister-based human NPWT (3M/KCI V.A.C., Smith & Nephew RENASYS) — the conventional analog this candidate's design explicitly rejects

• What it is: human-labeled, human-510(k)-cleared canistered powered suction pumps (product code OMP, 21 CFR 878.4780 [21]), applied to animals off-label or by dedicated veterinary NPWT rental vendors.
• Price / what it realizes per unit: not disclosed on the one US veterinary NPWT rental/support vendor page found; pricing is quote-only ("Get a Quote") [16].
• Evidence behind it: human evidence is extensive (dozens of systematic reviews/ meta-analyses surfaced in the queries in §10, not individually appraised here since they are human-population, off-topic for this dossier's species scope except as the market/regulatory backdrop for §7–§8); veterinary-specific evidence for the canistered form factor specifically (as opposed to canister-free) was not separately located — the veterinary case series found [5][6][7][8][9] do not specify canister vs. canister-free in every case.
• Adoption: not established at a US veterinary population level; the vendor found [16] states it serves "equine, canine, feline, avian, primate, reptile and even large aquatic mammals," which is evidence a commercial rental channel exists, not evidence of volume.
• Abandonment record — why people stop:

• Verbatim:

"Due to increase in complaints related to leak alarms" — [4], FDA recall reason, Z-1176-2025 (3M V.A.C. VIA Negative Pressure Wound Therapy System)

"Black particulate matter from the carbon filter component of the canisters entering the NPWT pump and potentially causing damage to the pump" — [4], Z-1596-2024/Z-1597-2024

"Reports of wound fluid and/or blood that were not evacuated from beneath the wound dressing and the pump blockage alarm did [not alert]" — [4], Z-1157-2014 (text as returned by the connector; truncated in the source record itself)

"20% ceased NPWT prematurely because of experienced limitations in daily activities." — [2], PMID 33581961

Read this the way this repo's other dossiers read an abandonment record: the recall record is evidence that the canister component specifically is a repeat, named point of device failure across at least three different manufacturers' product lines (3M/KCI, Smith & Nephew, Cardinal Health, Medela all appear in the full 37-record set — see §10) over a 15-year window — not evidence that a canister-free replacement would avoid every failure mode a canister introduces, since dressing-connector and tubing-blockage failures (the mechanism this candidate's own dressing/drape is built around) recur too [4]. It is also not evidence that veterinary clinicians would switch to a canister-free product — that is a class-3 question and its twin is addressed below.

Canister-free single-use human NPWT (Smith & Nephew PICO) used off-label — this candidate's nearest direct predicate/analog

• What it is: a human-labeled, human-510(k)-cleared (K211318, and prior PICO generations) single-use, canister-free NPWT system using an absorbent dressing rather than a fluid canister; cleared indication (verbatim, human population): "indicated for patients who would benefit from a suction..." (indication text truncated in the retrieved 510(k) summary; see [17] for the full source) [17][18].
• Price / what it realizes per unit: not established for veterinary use; no US veterinary-channel per-unit price for PICO was located (mirroring the same gap the diabetes-monitoring dossier records for its own device category — see veterinary-diabetes-glucose-monitoring.md §5).
• Evidence behind it: §4 in full — this is the device evaluated in candidate idea-002's claims 8, 9, 10, and 20, and the same device named in this dossier's §4 rows.
• Adoption: not established at a population level for veterinary use; every veterinary study located is a single-institution case series (n=3 to n=42 animals).
• Abandonment record — why people stop:

• Verbatim:

"Application and maintenance of the portable device was technically easy and no major complications were encountered. Minor complications consisted of fluid accumulation in the evacuation tubing." — [6], PMID 27569833 (repeated from §4 because it is the load-bearing abandonment-adjacent line for this specific incumbent)

Read this in both directions, per this repo's own standard for this kind of evidence. The complication and equivocal-outcome record above is real, measured evidence that the off-label incumbent this candidate is positioned against has documented failure modes at this candidate's exact site in both species — not evidence that a purpose-built veterinary canister-free device engineered around fur adhesion and a limb-conforming interface would fix them, and not evidence that clinicians would switch. A device engineered around exactly the adhesive/dressing-interface failures named here might address them or might not; nothing here tests that, the same caveat the diabetes-monitoring dossier states for its own analogous comparison.

Class-3 question this section deliberately does not answer, and its twin: "Would veterinarians adopt a purpose-built veterinary canister-free device over continuing to use off-label human PICO or canistered systems?" is unanswerable and is not answered here (see §9). Its revealed-behaviour twin — the documented complication, discontinuation, and equivocal-outcome record of the off-label incumbent already in use — is answered, above.

Gaps: no veterinary-labeled competing product (Aluco Guardian, GluCurve-style purpose- built devices — see §8) has any published complication or accuracy/outcome literature located in this pass; MAUDE narratives are unreachable (no connector); no data on what fraction of US veterinary practices offer any form of NPWT versus bandage-only.

6. Reimbursement landscape

as_of: 2026-08-27

No third-party payer exists for veterinary devices in the US, the same structural fact the diabetes-monitoring dossier records for a different device category — see veterinary-diabetes-glucose-monitoring.md §6 for the fuller treatment of why hcpcs, payment, coverage, and procedures are all structurally blind to animal care, not merely silent on this specific device. What a veterinary "reimbursement" section can actually contain, and what was found here:

Gaps: commercial pet-insurance coverage-policy documents for wound-care devices specifically — not reviewed this pass (would need the same human-attached Trupanion/Nationwide/ASPCA policy review the diabetes-monitoring dossier names as its own open item). No veterinary fee-benchmark survey (AAHA/AVMA practice economics) was reviewed for what a practice can pass through to an owner for an adjunct wound device — the same gap candidate idea-002's own Scores table already names for its TAM component 2.

7. Technology trajectory

as_of: 2026-08-27

Note per this repo's own template instruction: the 510(k) clearance count above is a counted series and cannot be scored from (docs/backlog.md 1.10).

Gaps: no patent-landscape check was run here (candidate idea-002's own claims 5-7 already carry this gap — PATENTSVIEW_API_KEY unset, and the live canister-free/dressing-interface FTO risk is unsearched by construction of the patent connector). No membrane/dressing chemistry literature specific to fur-compatible or limb-conforming adhesives was located — consistent with candidate idea-002's own moat claim (claim 16) being unchecked.

8. Market players & dynamics

as_of: 2026-08-27 · sources searched: openFDA recalls/clearances on product code OMP, web search followed to vendor primary pages

What this section explicitly does not record as fact: a web search for a "pet diabetes care devices market" figure was named as deliberately excluded in the diabetes-monitoring dossier for the same reason a "veterinary wound care market" figure would be excluded here — no comparable market-sizing report was pulled into this dossier because none was independently sourced and appraised this pass; if one surfaces later it should be named and explicitly not used, the same way the diabetes dossier's §8 records it.

Gaps: no funding data for Aluco Health or any purpose-built veterinary NPWT vendor was retrieved. No recall or complaint channel exists for a veterinary-only device (structural, per §6), so no complaint record for Aluco Guardian or GluCurve-style products can ever be established through a US federal source.

9. Open questions — and what would settle them

Class-3 questions are recorded here and never answered here, per this repo's own rule.

10. Provenance & staleness

Queries run against connectors literature in this pass (for anyone re-running this): "negative pressure wound therapy canister leak dressing failure," "single use negative pressure wound therapy discontinuation dressing," "PICO negative pressure wound therapy systematic review," "negative pressure wound therapy adverse events complications review," "vacuum assisted closure device complications dressing failure," "negative pressure wound therapy safety FDA bleeding death adverse event" (zero hits), "negative pressure wound therapy dog case series," "negative pressure wound therapy canine retrospective outcomes complications," "PICO single use negative pressure wound therapy randomized controlled trial device removed" (zero hits), "canister negative pressure wound therapy patient burden quality of life bulky noise" (zero hits), "negative pressure wound therapy quality of life patient experience," "PICO negative pressure wound therapy diabetic foot ulcer randomized" (request failed, HTTP 429, not retried), "negative pressure wound therapy horse retrospective case series," "equine distal limb wound healing second intention bandaging," "canine distal limb degloving wound incidence" (zero hits), "equine limb wound incidence trauma prevalence," "dog traumatic wound emergency presentation incidence veterinary," "equine wound trauma UK veterinary practice prevalence VetCompass" (zero hits), "cost negative pressure wound therapy veterinary practice economics" (zero hits), "Schnierer negative pressure wound therapy punch grafting horses" (zero hits), "equine wound healing distal limb review best practice evidence" (zero hits).

What this dossier has never looked at: MAUDE narratives (no connector exists in this repo, docs/backlog.md 1.9); any US veterinary epidemiology source outside PubMed's index (Banfield/Mars, VetCompass US, the Veterinary Medical Database — none reachable by connector, none located by web search this pass); the ACVS or AAHA wound-management guideline full text (not attempted, distinct from a 403-blocked attempt); the Schnierer et al. equine case series itself, only its secondhand description via a commentary; commercial pet-insurance policy text for any named insurer; a patent landscape search (credential-blocked); funding or company-financial data for any purpose-built veterinary NPWT vendor; a direct attempt at theveterinarynurse.com, which returned HTTP 403 and is recorded as not retrieved, the same class of failure this repo already names for fda.gov and aaha.org. Absence of scanning is not absence of change, and a later reader should treat §1 (epidemiology) and most of §6 (reimbursement) as a starting point, not as coverage.

Sources

1. PMID 33609382 — "Single-use negative-pressure wound therapy versus conventional dressings for closed surgical incisions: systematic literature review and meta-analysis," BJS Open, 2021 Jan 8. https://pubmed.ncbi.nlm.nih.gov/33609382/ (human population)
2. PMID 33581961 — "Which determinants are considered to be important for adherence to Negative Pressure Wound Therapy: A multimethods study," Journal of Tissue Viability, 2021 May. https://pubmed.ncbi.nlm.nih.gov/33581961/ (human population)
3. PMID 40358217 — "Patient preference with regard to negative pressure wound therapy and participation in wound care: a qualitative study," Journal of Wound Care, 2025 May 2. https://pubmed.ncbi.nlm.nih.gov/40358217/ (human population, n=10)
4. openFDA device/recall, product_code=OMP, window 2011-08-31 to 2026-08-27, queried via python3 -m connectors recalls --product-code OMP --since 15y on 2026-08-27; 37 records retrieved and inspected in full. Individual record IDs cited inline: Z-1176-2025, Z-0507-2025, Z-0516-2025, Z-1596-2024, Z-1597-2024, Z-2542-2020, Z-1157-2014 through Z-1162-2014, Z-1067-2014, Z-1068-2014, among others in the full set. https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfRES/res.cfm
5. PMID 25449799 — "Negative pressure wound therapy, silver coated foam dressing and conventional bandages in open wound treatment in dogs. A retrospective comparison of 50 paired cases," Veterinary and Comparative Orthopaedics and Traumatology, 2015. https://pubmed.ncbi.nlm.nih.gov/25449799/
6. PMID 27569833 — "Negative pressure wound therapy using a portable single-use device for free skin grafts on the distal extremity in seven dogs," Australian Veterinary Journal, 2016 Sep. https://pubmed.ncbi.nlm.nih.gov/27569833/
7. PMID 28151546 — "Negative pressure wound therapy using polyvinyl alcohol foam to bolster full-thickness mesh skin grafts in dogs," Veterinary Surgery, 2017 Apr. https://pubmed.ncbi.nlm.nih.gov/28151546/
8. PMID 33724500 — "Early and aggressive surgical debridement and negative pressure wound therapy to treat necrotizing fasciitis in three dogs," Veterinary Surgery, 2021 Nov. https://pubmed.ncbi.nlm.nih.gov/33724500/
9. PMID 34670699 — "Use of Negative Pressure Wound Therapy in the Treatment of Limb Wounds: A Case Series of 42 Horses," Journal of Equine Veterinary Science, 2021 Nov. https://pubmed.ncbi.nlm.nih.gov/34670699/
10. PMID 34115409 — "Limited added value of negative pressure wound therapy compared with calcium alginate dressings for second intention healing in a noncontaminated and contaminated equine distal limb wound model," Equine Veterinary Journal, 2022 May. https://pubmed.ncbi.nlm.nih.gov/34115409/ (also candidate idea-002 claim 20)
11. PMID 35973001 — American Journal of Veterinary Research, 2022;83(10) — canister-free NPWT (PICO 1.6) pilot study in Beagles. https://pubmed.ncbi.nlm.nih.gov/35973001/ (also candidate idea-002 claim 9)
12. PMID 30841889 — "Feasibility of a disposable canister-free negative-pressure wound therapy (NPWT) device for treating open wounds in horses," BMC Veterinary Research, 2019 Mar 6. https://pubmed.ncbi.nlm.nih.gov/30841889/ (also candidate idea-002 claim 10)
13. PMID 37624295 — "Negative-Pressure Wound Therapy (NPWT) in Horses: A Scoping Review," Veterinary Sciences, 2023 Aug 6. https://pubmed.ncbi.nlm.nih.gov/37624295/ (also candidate idea-002 claim 10)
14. Ribeiro et al., "Wound healing in horses: What went wrong?," *Equine Veterinary Education*, 2026, DOI 10.1111/eve.70089, retrieved directly 2026-08-27. https://beva.onlinelibrary.wiley.com/doi/10.1111/eve.70089 — commentary citing an equine case series (Schnierer et al.) not independently retrieved by this dossier.
15. Aluco Health, "Aluco Guardian NPWT System," https://alucohealth.com/, retrieved directly 2026-08-27. UK-based vendor; non-US jurisdiction.
16. The Wound Vac Company, veterinary services page, https://thewoundvaccompany.com/veterinary, retrieved directly 2026-08-27. US-based vendor.
17. openFDA device/510(k), product_code=OMP, queried via `python3 -m connectors clearances --product-code OMP --since 10y` on 2026-08-27; 103 total matches, 50 most recent records inspected, including K211318 (Smith & Nephew PICO 7/14, cleared 2022-01-05).
18. FDA 510(k) summary K211318, retrieved via `python3 -m connectors clearance-summary K211318` on 2026-08-27. https://www.accessdata.fda.gov/cdrh_docs/pdf21/K211318.pdf
19. https://www.theveterinarynurse.com/content/clinical/the-use-of-negative-pressure-wound-therapy-in-veterinary-wound-care/ — attempted 2026-08-27, returned HTTP 403, not retrieved.
20. knowledge-base/domains/veterinary-diabetes-glucose-monitoring.md — this repo's other veterinary domain dossier, cited for its parallel treatment of the no-federal-payer structure (§6) and its owner-survey abandonment-record method (§5), not as a source of fact about this domain's own population.
21. `python3 -m connectors regulation 807.65 --title 21 --expect "veterinary" --jurisdiction US, run 2026-08-27 → status verified`, source_ref eCFR versioner title-21, issue 2026-08-19, section=807.65. Independently re-run for this dossier; the same section is already independently verified in candidate idea-002 claim 2.