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Model Number 300-20
Event Date 09/01/2014
Event Type  Malfunction  
Event Description

It was initially reported that the patient had high impedance at a recent appointment. The patient¿s generator was turned off and the patient was referred for surgery. The patient had a generator and lead replacement and the explanted products were returned to the manufacturer for evaluation. A comprehensive automated electrical evaluation showed that the pulse generator performed according to functional specifications. The battery, 2. 986 volts as measured shows an ifi=no condition. The data in the diagaccumconsumed memory locations revealed that 2. 444% of the battery had been consumed. There were no performance or any other type of adverse conditions found with the pulse generator. Note that a large portion of the lead assembly (body) including the (+) white electrode was not returned for analysis and therefore a complete evaluation could not be performed on the entire lead product. During the visual analysis of the returned 91mm portion the (+) marked connector quadfilar coil appeared to be broken approximately 238mm past the end of the cut / torn / connector silicone / inner silicone tubes. Scanning electron microscopy was performed and identified the area as being mechanically damaged which prevented identification of the coil fracture type with fine pitting. Pitting was observed on the coil surface. It is believed that stimulation was present for a certain period of time as evidenced by the presence of metal pitting. Low magnification sem analysis of the quadfilar coil shows characteristics typical of a lead discontinuity which may include: material fracture, rough or pitted surface, thinned material thickness, electro-etching or material dissolution. The abraded openings found on the outer silicone tubing and the cut ends that were made during the explanted process, most likely provided the leakage path for the dried remnants of what appeared to have once been body fluids found inside the outer silicone tubing. For the observed inner tubing fluid remnants, there was no obvious path for fluid ingress other than the cut ends that were made during the explanted process. What appeared to be white deposits were observed in various locations. Eds (energy dispersion spectroscopy ¿ provides chemical or element identity/composition analysis) was performed and identified the deposit as containing silicon, phosphorus, sodium, magnesium, aluminum and calcium. With the exception of the observed discontinuity the condition of the returned lead portions is consistent with conditions that typically exist following an explant procedure. No other obvious anomalies were noted. The setscrew marks found on the lead connector pins provide evidence that, at one point in time, a good mechanical and electrical connection was present. Continuity checks of the returned lead portions were performed, during the visual analysis, and no other discontinuities were identified. Based on the findings in the product analysis lab, there is evidence to suggest discontinuities in the returned portions of the device which may have contributed to the stated allegations of high impedance. Note that since a large portion of the lead assembly (body) including the (+) white electrode was not returned for analysis, an evaluation and resulting commentary cannot be made on that portion of the lead.

Manufacturer Narrative

Device failure occurred, but did not cause or contribute to a death or serious injury.

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Type of DeviceLEAD
Manufacturer (Section D)
100 cyberonics blvd
houston TX 77058
Manufacturer (Section G)
100 cyberonics blvd
suite 600
houston TX 77058
Manufacturer Contact
njemile crawley
100 cyberonics blvd
suite 600
houston , TX 77058
MDR Report Key4198813
Report Number1644487-2014-02815
Device Sequence Number1
Product CodeLYJ
Report Source Manufacturer
Source Type Health Professional,Company Representative
Reporter Occupation
Type of Report Initial
Report Date 09/30/2014
1 Device Was Involved in the Event
0 PatientS WERE Involved in the Event:
Date FDA Received10/24/2014
Is This An Adverse Event Report? No
Is This A Product Problem Report? Yes
Device Operator LAY USER/PATIENT
Device EXPIRATION Date03/31/2002
Device MODEL Number300-20
Device LOT Number36236C
Was Device Available For Evaluation? Device Returned To Manufacturer
Date Returned to Manufacturer10/07/2014
Is The Reporter A Health Professional? Yes
Event Location Other
Date Manufacturer Received09/30/2014
Was Device Evaluated By Manufacturer? Yes
Date Device Manufactured03/08/2000
Is The Device Single Use? Yes
Is this a Reprocessed and Reused Single-Use Device? No
Type of Device Usage Initial