idea-007 · desirability deck
Every slide states a condition that would have to be true, then reports where it stands using the candidate file's own claim and its own confidence tag. A deck never upgrades a tag, invents a number, or recommends anything, and there is no ask slide.
The chair: the owner of a cat with chronic kidney disease who is sticking a needle under its skin several times a week, and the veterinarian deciding whether to offer an implant instead.
How to read this: every slide is a condition, not a conclusion. A bracketed claim reference points into knowledge-base/candidates/idea-007.md — the number is the claim's position in its ## Claims list, the tag is copied from it and never adjusted here. A [no claim] marker means nothing in the file speaks to the condition at all. See docs/deck-spec.md.
What changed since the 2026-08-24 build — the cheapest next test was spent and it came back. That build said three times that the SUB precedent had been "located by title, never read". It has now been read [claim 32: unconfirmed], [claim 33: unconfirmed], along with owner-behaviour survey data [claim 29: unconfirmed] through [claim 31: unconfirmed] and human implanted-port infection rates [claim 34: unconfirmed], [claim 35: unconfirmed]. Rebuilt from the file, not patched.
Would have to be true: There would have to be a large population of cats on long-term home subcutaneous fluids whose owners are struggling with the needle regimen — struggling enough that treatment lapses.
Where it stands: This is now the best-evidenced premise on the deck. In a survey of 468 owners of cats with chronic kidney disease, 399 (85%) were giving subcutaneous fluids at home [claim 29: unconfirmed] — so the base behaviour is near-universal in the managed population. And among those 399, 155 (39%) reported skipping fluid administration in the prior 2-4 weeks because their cat was frustrated [claim 30: unconfirmed]. That is a directly measured lapse rate attributable to the cat's tolerance of the procedure, which is precisely the premise the file had been carrying as an assumption [claim 17: unconfirmed]. Of the 57 surveyed owners not giving fluids at all, 5 (9%) cited that fluids were not tolerated [claim 31: unconfirmed]. Every one of these is unconfirmed — a literature scan locates a paper and cannot appraise it.
What would settle it: A human reading PMID 28948902 in full for how "frustrated" was operationalised and whether skipping predicts discontinuation rather than merely delay. Then practice records on how long home fluid regimens actually last.
If it's false: The product improves an experience nobody quits over, and the willingness to accept surgery [claim 16: unconfirmed] loses its motivating force. On current evidence that is the less likely reading.
Would have to be true: An owner would have to consent to an elective surgical implant under general anaesthesia in an elderly cat with reduced renal reserve — and then learn a new procedure at home.
Where it stands: Still the candidate's own flagged assumption and still unbacked [claim 16: unconfirmed], [claim 20: unconfirmed], [claim 19: unconfirmed]. What the SUB read supplies is a precedent for the decision: cats in this exact species and clinical context do receive implanted ports under general anaesthesia, in numbers large enough to support multi-generational device studies — 95 devices in 66 cats [claim 32: unconfirmed], 121 renal units in 80 cats [claim 33: unconfirmed]. Owners consent to this class of intervention. Note what that precedent is not: SUB is placed for ureteral obstruction, an immediately life-threatening problem [claim 6: unconfirmed], whereas this implant would treat an inconvenience in an ambulatory cat. The consent question transfers only partly.
What would settle it: Anaesthetic-risk data for short elective procedures in IRIS stage 2-3 cats — the leg the research lane did not reach; owner willingness research framed against an elective rather than a rescue indication.
If it's false: The product asks a frightened owner to gamble an already-ill cat on a procedure that treats an inconvenience, which is a conversation most veterinarians will decline to have.
Would have to be true: An ordinary general practice would have to be willing to place the port — not just referral surgeons — or the addressable population collapses to referral caseload.
Where it stands: Unbacked and untouched by the week's work [claim 18: unconfirmed]. The SUB literature is a caution here rather than a comfort: those studies come from referral settings and report device-management complexity — mineralization varying with flush protocol [claim 32: unconfirmed] — that implies ongoing specialist involvement rather than a place-and-forget procedure.
What would settle it: Interviews with general practitioners on whether they would place this; the existing port products' own instructions for use, for what level of surgical skill they assume [claim 3: unconfirmed].
If it's false: The market is referral-only, and the obtainable-share assumption [claim 10: unconfirmed] is measuring the wrong denominator.
Would have to be true: The cost — implant fee, anaesthetic risk, consumables, and a long-term oncologic hazard — would have to be worth removing the needles.
Where it stands: The oncologic hazard remains unasserted by design and unresolved [claim 13: unconfirmed], [claim 4: unconfirmed], [claim 5: unconfirmed]. What the week added is the other long-term cost, and it is substantial: in 95 SUB devices across 66 cats, chronic device mineralization occurred in 19-50% of devices and chronic urinary tract infection in 3-33% of cats, depending on the flush protocol [claim 32: unconfirmed]. That is an implanted feline port fouling at a high rate in real long-term use. Against it, human implanted ports are reassuring: a catheter-related bloodstream infection rate of 0.05 per 1,000 catheter-days across 37,763 catheter-days [claim 34: unconfirmed] and early port infection in 1.2% of 1,714 placements [claim 35: unconfirmed]. The gap between those two pictures is the honest description of this candidate's risk, and the human numbers come from clinician-accessed ports, not owner-accessed ones.
What would settle it: A prospective feline case series with multi-year follow-up powered to say something about tumour incidence at this site — Tier 3, and the same study the capital claim already contemplates [claim 14: unconfirmed].
If it's false: The owner is being asked to trade a nuisance for a cancer risk, and no amount of convenience carries that conversation.
Would have to be true: A veterinarian would have to be able to say, with a source, that this implant is safer over years than the needles it replaces.
Where it stands: The proxy the last build asked for has arrived and it is mixed. The SUB long-term record shows a real fouling problem [claim 32: unconfirmed] — and it also shows the problem being engineered out: comparing device generations across 80 cats, catheter kinking fell from 15.5% (11 of 71) with SUB 2.0 to 0% (0 of 50) with SUB 3.0, and 90-day survival rose from 75% to 94% [claim 33: unconfirmed]. Read together, those say implanted feline ports have characterisable, improvable failure modes and an incumbent actively improving them. A veterinarian asked to recommend this device will know that literature.
What would settle it: A human reading both SUB papers in full for whether mineralization is a function of urine chemistry — which would not transfer to a subcutaneous fluid port — or of implant surface and dwell time, which would. That distinction decides whether [claim 32: unconfirmed] is a warning about this product or about a different application.
If it's false: The device sells on convenience alone into a decision that owners make emotionally and veterinarians make conservatively.
Would have to be true: Owner surveys and a literature read would have to establish demand and the safety proxy before any implant is manufactured.
Where it stands: The literature read is done and both halves came back [claim 29: unconfirmed] through [claim 35: unconfirmed]. Demand is better evidenced than the last build could show; the safety proxy is mixed. The owner surveys — willingness to accept elective anaesthesia specifically — have not been done, and the file is explicit that owner and practitioner preference has no connector.
What would settle it: The surveys, now askable with a sharper frame: 39% of these owners are already skipping doses [claim 30: unconfirmed], so the question is not whether the burden is real but whether surgery is the remedy they would choose for it.
If it's false: The idea was specified from a mechanism — ports work, needles are unpleasant — rather than from an owner's account of why fluid therapy stops. That reading is weaker than it was.
Every condition above with nothing verified behind it. This candidate has two verified claims — [claim 2: verified], that veterinary-only manufacturers need not register with FDA, and [claim 36: verified], that human implanted vascular access ports are Class II under 21 CFR 880.5965, product code PXK. Both are facts about regulatory paperwork.
Two structural notes no scan will fix. openFDA holds no records for animal-only devices, so a none from clearances or recalls on this candidate is coverage absence, never competitive or safety absence [claim 15: unconfirmed]. And the two prevalence figures the research lane returned are not reconcilable at face value: 50% in a US feline-only practice cohort [claim 38: unconfirmed] against 1.2% in a UK primary-care cohort of 353,448 cats [claim 39: unconfirmed]. Those are different populations answering different questions, and any TAM built on either without saying which is a number without a meaning.
If only one thing from this chair could be checked: whether owners will consent to elective general anaesthesia in an elderly CKD cat to avoid needles [claim 16: unconfirmed], [claim 20: unconfirmed].
It survives the week's evidence, and the evidence has moved the argument on both sides of it without settling it. The burden it trades against is now measured rather than assumed — 39% of owners actively giving fluids skip doses because the cat is frustrated [claim 30: unconfirmed] — which makes the motivation real. And the precedent for the intervention is established: cats in this species and disease do receive implanted ports under anaesthesia [claim 32: unconfirmed], [claim 33: unconfirmed].
But the precedent is for a rescue indication, not an elective one, and the same literature shows those implants fouling in 19-50% of cases [claim 32: unconfirmed]. So the owner is being asked to accept a known-imperfect implant, electively, for a problem they are currently managing badly rather than not at all. That is a harder ask than the last build framed, and it is answerable by asking owners rather than by any further reading.
Naming it is not a recommendation, a gate, or a kill.