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The root cause of the incident is unknown at the time of the initial report.The complaint device will be returned for an evaluation.The dhr review, which examines the dhr, ncrs, and ecos will be done as part of the root cause investigation.
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The customer reported as follows: unable to use device: attempted.The problem was indicated as "the sheath removal was attempted and the sheath broke inside the body into several pieces.The patient is fully recovered.Difficult bifurcation medical or surgical interventions.Type of procedure: angiogram.As reported device codes: 1048: break.As reported patient codes: 9124: hematoma.Patient present at time of event?: yes.Patient outcome: f11: minor injury, illness, impairment.Patient complications: bleeding, hematoma.
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The device was returned for the evaluation.The sheath was broken in 3 pieces.The portion closest to the hub and middle section were held together by the coil while the distal end with the marker band and tip was broken off (including the coil).In all three pieces of the shaft, it could be seen that portions of the sheath coil were undone and separated from the sheath jacket.Upon closer inspection of the breakage points, small portions of shaft jacket material could be seen still attached to coil.In addition to visually inspecting the different breakage sections along the sheath, the tip of the sheath was also checked for any signs of damage.No damage was observed on the tip.In the customer complaint report, it was mentioned a potential contributor to the procedure complication was a difficult bifurcation.Examining the closeup pictures of the breakage points, the material shows evidence of tearing which could confirm kinking of the sheath.Since the sheath removal force could have also contributed to breakage (if the material at the kink locations was already weakened), it is not clear if the breakage was a result of kinking alone or a combination of kinking and tensile force (during removal).The unwinding in coils would be a result of the removal action as the sheath would require a pull force.To account for bending of the sheath during use, kink testing was conducted on the sheaths based on en13868:2002: catheters - test methods for kinking of single lumen catheters and medical tubing during the design verification phase.In the case of the complaint, if the bifurcation curvature was smaller than the tested kink distance, then the sheath would be at risk of breakage (rk-134, dufmea no 11).Since the bifurcation curvature is not known, no comparison against the verified kink values could be done.Since direct kink damage could not be demonstrated, the sheath tear locations were inspected for potential material defects that could lead to breakage.Four sections of the sheath were prepared for tensile testing.The first sample was taken from the proximal end of the sheath, the second and third samples were taken from the middle section of the sheath, and the fourth sample was taken from the distal end of the sheath.For each sample, tensile testing was conducted as close as possible to the tear location.The tensile test was based on iso 11070:2014: sterile single-use intravascular introducers, dilators and guidewires, annex c.The iso minimum peak tensile force requirement is 15 n.All measured values were in a range of 41.75-50.99 n, with an average value of 48.11 n.From the tensile test data collected, all sections tested yielded values exceeding the minimum tensile force value required by the standard.Also, there were no tensile force changes between the samples.Lastly, the tear sections along the shaft were visually inspected under 3.5x magnification to see if there was any visual evidence of defective material (i.E., bubbling, voids).No defects were observed on the tear sections which could explain the breakage.The manufacturer performed dhr review of complained lot and has not identified any indication that could lead to the complained issue.Based on the analysis of the returned sheath, visual inspection, and tensile testing of the sample at tear locations, there was no indication of flaws in the material which could have led to premature breakage of the sheath during extraction.Additionally, dhr review done on eco, ncr and manufacturing documents didn't give any results that can be related to the defect.There is no indication of a design or process issue which would have resulted in the breakage of the sheath as the catapult family of sheaths was shown to pass kink stability and tensile strength test requirements.Further, tensile testing and visual inspection of the returned product did not reveal any material defects which could have led to breakage.It is possible that the sheath failure was a result of subsequent stresses introduced due to the complex vascular path leading to unintended breakage during removal.Since it was not possible to get additional information about the applied procedure after the operation, it is unknown whether the clinician had inserted the dilator during removal of sheath as required per ifu.However it is a possibility that the dilator might have not been used and it might have played a role on sheath unravelling.
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