Qn#(b)(4).The customer returned one unit ae05ml autoend05 ml for investigation.The returned sample was visually examined with and without mag nification.Visual examination of the returned device revealed that the sample was returned with its trigger partially engaged.The jaw spring was disengaged and was slightly bent.Reference file (b)(4) for investigation photos.Dimensional inspection was performed on the jaw spring and the bottom jaw.A digital caliper (equipment id 10081388 and calibration due date nov.11, 2020) was used to take the measurements.The thickness of the jaw leg on the bottom jaw where the jaw spring connects was measured.The specification as outlined in part drawing g00455 is.010" +/-.001".The thickness was measured to be.0105" which meets the specification.Additionally, height of the jaw spring tips were measured.The specification as outlined in part drawing tfx-001524 is.0150" +.0025 "/-.0020".The height of the tip that connects to the bottom jaw was measured to be.0155".The height of the tip that connects to the top jaw was measured to be.0155".Both tips on the jaw spring were within the specification.First, the trigger cycle was completed.Functional inspection could not be performed due to the condition of the returned sample.However, the sample was disassembled in order to inspect the internal components.It was found that the clips were out of position and stacking on one another in the channel.The bottom jaw had a distinct scrape mark where the jaw spring connects to it.This indicates that the jaw spring was connected properly before the device was used and it appears that it disconnected during use.Dimensional inspection was performed on the bottom jaw and jaw spring.Both components were within specification.The sample was received with 11 clips remaining in the channel indicating that 4 clips were fired by the end user.The jaw spring being disengaged from the bottom jaw would prevent the bottom jaw from closing properly.If a clip misloads and is not manually cleared prior to loading another clip, the clips can be held up in the loading sequence and stack on one another in the channel.The root cause of this complaint issue was that the jaw spring disconnected from the bottom jaw.However, it could not be determined why or how this occurred.Reference file anp1900074921 for investigation photos.The ifu for this product, l06072, was reviewed as a part of this complaint investigation.The ifu for this product states, "mishandling of appliers may result in improper load and/or closure of the ligating clip." the part drawings for the bottom jaw, g00455, and jaw spring, tfx-001524, were also reviewed as a part of this complaint investigati on.A corrective action is not required at this time since the root cause of the complaint could not be determined.However, there is no evidence to suggest a manufacturing related cause since the affected components were found to be within specification.
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