The catheter was returned to origen, where it was sterilized and examined.After inspecting the device as received, it was clear that there was a difference in color and the layers of the catheter separated.To manufacture the catheters, an inner extrusion is produced, wire is wrapped around the extrusion, and cinched down using a teflon shrink tube; the teflon shrink tube is then removed and a final outer layer of blue pebax is fused over the wire layer.The most likely root cause is that the teflon shrink tube was not fully removed on this catheter, and that a thin layer of the final pebax layer covered the teflon.It is likely that the blue outer layer must have covered the teflon layer so it was not visible during inspections, but this was not secure and became dislodged during use.This supplier is no longer in use for unrelated reasons.
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