AMS 700 MAUDE adverse events - March+April 2026 updates - High-Level Summary (378 Events)

[lasthope2.0]

1. Dominant failure mode: fluid loss / inflation failure. By far the most frequent presenting complaint — pump flat/collapsed, device won't inflate, reservoir empty, cylinders deflated. Encountered in at minimum 60–70% of events in varying forms.
   
2. Cylinder as primary failure locus. When site identified, cylinders are most frequently implicated: holes in inner or outer tube, proximal-end rupture, KRT (Kink Resistant Tubing) junction failure, wear-at-fold perforation. Left and right cylinders implicated with roughly equal frequency.
   
3. KRT wear — the only confirmed failure mechanism. In the small subset of events where devices were physically returned to BSC's QA lab, KRT wear to the filament is the consistent finding — both cylinders, and the MS pump tubing. In one returned specimen, KRT wear at the proximal cylinder end produced confirmed inner and outer tube holes with a positive leak. This is a fatigue/wear failure mode, not a manufacturing defect, and BSC explicitly documents it as anticipated in their risk framework.
   
4. MS pump activation test failures in returned specimens. In multiple QA lab returns, the MS pump failed activation tests 2 and 3 despite passing leak testing. This pattern — pump structurally intact but functionally failing on activation testing — is not explained by KRT wear alone and represents a discrete mechanism. BSC's conclusion: "could affect product performance" without corrective action flagged.
   
5. Tenacio PRV (Pressure Relief Valve) dysfunction — identifiable cluster. At least 3 events specifically name the Tenacio pump PRV: premature engagement causing deflation before full inflation, difficulty inflating beyond a threshold. In one case, the surgeon left the device implanted at suboptimal inflation because the patient was believed unlikely to reach PRV engagement threshold. Multiple Tenacio-to-MS pump conversions documented. This is a functionally distinct signal from generic "inflation difficulty."
   
6. Tubing failure modes: kink, disconnection, fraying. Tubing kinks causing failure to cycle, connector disconnection confirmed in at least one explant, and fraying at the pump-cylinder junction. Kinking sometimes attributed to deep SOR reservoir placement interfering with tubing geometry.
   
7. Reservoir as a distinct failure locus. Reservoir holes documented in multiple events, confirmed on QA return in at least one case where the pump was flat, the reservoir was empty, and two holes were identified on analysis. Reservoir failures are less frequent than cylinder failures but well-represented.
   
8. Reservoir herniation — clinically coherent cluster. Multiple events describe reservoir migrating out of its pocket into the groin/inguinal region, one causing nerve compression, one requiring SOR repositioning from ectopic placement. Hernia requiring IPP explant for inguinal hernia repair also documented. These cluster around ectopic/high submuscular placement as expected.
   
9. Erosion events — bilateral urethral erosion in one catastrophic case. Multiple distal erosion events; most surgically managed with cylinder explant and repair. One event stands out: bilateral cylinder erosion through the urethra after deferred revision — no new cylinders placed, future staged reimplantation planned. Glans erosion with visible cylinder tip also documented.
   
10. Infection events — Pseudomonas flagged. At least 5 infection events. The most severe: febrile patient requiring ambulance transport, IV antibiotics, Pseudomonas aeruginosa confirmed, scrotal washout with drain placement, persistent swelling and 90-degree penile curvature at follow-up, device retained. Others managed with washout and salvage to Tactra Malleable.
    
11. Auto-inflation — multiple events. At least 4–5 discrete auto-inflation events. Some managed with referral to post-op troubleshooting; others required explant/replacement. One event features concurrent auto-inflation and deflation difficulty.
    
12. Sizing and positioning errors — coded as user error. Multiple events: cylinder too short, undersized cylinders causing glans droop and penetration difficulty, pump riding too high, pump positioned too high making inflation difficult, supersonic transport deformity from inadequate initial dilation, and reservoir positioned too deep in SOR impairing cycling.
    
13. Intraoperative cylinder perforation. At least 2 events with suspected or confirmed sharp instrument damage during implant or explant: tool marks with hole at KRT junction confirmed on QA return in one case, scratch on cylinder side during implant with confirmed perforation in another.
    
14. Early post-implant failure. One event describes fluid loss within days of implant — right cylinder fully deflated, left partially filled, reservoir empty, no disconnection or holes identified. Mechanism indeterminate. This timing pattern is distinct from wear-related KRT failure.
    
    Abbreviations
    
    KRT = Kink Resistant Tubing
    MS Pump = Momentary Squeeze pump
    PRV = Pressure Relief Valve
    SOR = Space of Retzius
    

[Thisworld]

1. Dominant failure mode: fluid loss / inflation failure. By far the most frequent presenting complaint — pump flat/collapsed, device won't inflate, reservoir empty, cylinders deflated. Encountered in at minimum 60–70% of events in varying forms.
   
2. Cylinder as primary failure locus. When site identified, cylinders are most frequently implicated: holes in inner or outer tube, proximal-end rupture, KRT (Kink Resistant Tubing) junction failure, wear-at-fold perforation. Left and right cylinders implicated with roughly equal frequency.
   
3. KRT wear — the only confirmed failure mechanism. In the small subset of events where devices were physically returned to BSC's QA lab, KRT wear to the filament is the consistent finding — both cylinders, and the MS pump tubing. In one returned specimen, KRT wear at the proximal cylinder end produced confirmed inner and outer tube holes with a positive leak. This is a fatigue/wear failure mode, not a manufacturing defect, and BSC explicitly documents it as anticipated in their risk framework.
   
4. MS pump activation test failures in returned specimens. In multiple QA lab returns, the MS pump failed activation tests 2 and 3 despite passing leak testing. This pattern — pump structurally intact but functionally failing on activation testing — is not explained by KRT wear alone and represents a discrete mechanism. BSC's conclusion: "could affect product performance" without corrective action flagged.
   
5. Tenacio PRV (Pressure Relief Valve) dysfunction — identifiable cluster. At least 3 events specifically name the Tenacio pump PRV: premature engagement causing deflation before full inflation, difficulty inflating beyond a threshold. In one case, the surgeon left the device implanted at suboptimal inflation because the patient was believed unlikely to reach PRV engagement threshold. Multiple Tenacio-to-MS pump conversions documented. This is a functionally distinct signal from generic "inflation difficulty."
   
6. Tubing failure modes: kink, disconnection, fraying. Tubing kinks causing failure to cycle, connector disconnection confirmed in at least one explant, and fraying at the pump-cylinder junction. Kinking sometimes attributed to deep SOR reservoir placement interfering with tubing geometry.
   
7. Reservoir as a distinct failure locus. Reservoir holes documented in multiple events, confirmed on QA return in at least one case where the pump was flat, the reservoir was empty, and two holes were identified on analysis. Reservoir failures are less frequent than cylinder failures but well-represented.
   
8. Reservoir herniation — clinically coherent cluster. Multiple events describe reservoir migrating out of its pocket into the groin/inguinal region, one causing nerve compression, one requiring SOR repositioning from ectopic placement. Hernia requiring IPP explant for inguinal hernia repair also documented. These cluster around ectopic/high submuscular placement as expected.
   
9. Erosion events — bilateral urethral erosion in one catastrophic case. Multiple distal erosion events; most surgically managed with cylinder explant and repair. One event stands out: bilateral cylinder erosion through the urethra after deferred revision — no new cylinders placed, future staged reimplantation planned. Glans erosion with visible cylinder tip also documented.
   
10. Infection events — Pseudomonas flagged. At least 5 infection events. The most severe: febrile patient requiring ambulance transport, IV antibiotics, Pseudomonas aeruginosa confirmed, scrotal washout with drain placement, persistent swelling and 90-degree penile curvature at follow-up, device retained. Others managed with washout and salvage to Tactra Malleable.
    
11. Auto-inflation — multiple events. At least 4–5 discrete auto-inflation events. Some managed with referral to post-op troubleshooting; others required explant/replacement. One event features concurrent auto-inflation and deflation difficulty.
    
12. Sizing and positioning errors — coded as user error. Multiple events: cylinder too short, undersized cylinders causing glans droop and penetration difficulty, pump riding too high, pump positioned too high making inflation difficult, supersonic transport deformity from inadequate initial dilation, and reservoir positioned too deep in SOR impairing cycling.
    
13. Intraoperative cylinder perforation. At least 2 events with suspected or confirmed sharp instrument damage during implant or explant: tool marks with hole at KRT junction confirmed on QA return in one case, scratch on cylinder side during implant with confirmed perforation in another.
    
14. Early post-implant failure. One event describes fluid loss within days of implant — right cylinder fully deflated, left partially filled, reservoir empty, no disconnection or holes identified. Mechanism indeterminate. This timing pattern is distinct from wear-related KRT failure.
    
    Abbreviations
    
    KRT = Kink Resistant Tubing
    MS Pump = Momentary Squeeze pump
    PRV = Pressure Relief Valve
    SOR = Space of Retzius
    

Thanks man. Don’t you also study the average and median time to mechanical failure anymore? If you’d like to include those data as well, they were very important and interesting.