Description of Event or Problem · 1
PATIENT WAS IMPLANTED WITH FREEHAND IRS IN 2001 AS PART OF A LOWER EXTREMITY STUDY NOT SPONSORED BY THE MANUFACTURER. THE FREEHAND IMPLANTABLE INTRAMUSCULAR (IM) ELECTRODE TO CHANNEL 1 ORIGINALLY GAVE POOR RESPONSE FOR APPROX. 1 1/2 YEARS, THEN GAVE NO RESPONSE AT ALL. NEW IM ELECTRODE WAS IMPLANTED DURING A REVISION SURGERY IN 2003 AND DID ELICIT A GOOD MUSCLE RESPONSE FROM ALL SOURCES EXCEPT CHANNEL 1 OF THE IRS DURING TESTING. REPLACEMENT IM ELECTRODE WAS LEFT CONNECTED TO CHANNEL 1 EVEN THOUGH THERE WAS NO APPARENT OUTPUT; THE IRS HAS PROGRAMMABLE CURRENT ON THE OTHER 7 CHANNELS AND APPEARS TO OPERATE CORRECTLY. IT IS SUSPECTED THAT THE IM CONNECTOR MAY HAVE MALFUNCTIONED. FOLLOW UP REPORT WILL BE SUBMITTED ONCE FURTHER INFORMATION IS AVAILABLE.