Patent ID: 6379338
Filing Date: 2002-04-30
Classification: A61M

Abstract:
In the combination of a catheter and a retracting cannula removably located in said catheter, said retracting cannula comprising an inner barrel telescoped into an outer barrel, the forward end of said inner barrel telescoped into one end of a tubular outer barrel, the other end of said outer barrel having a restricted opening, said forward end of said inner barrel formed with an enlarged circumferential ring and carrying a resiliently expandable tubular collet engaging said restricted opening, said collet including a portion extending through said restricted opening of said outer barrel, said portion of said collet having an expanded dimension greater than the restricted opening, a tubular cannula holder inserted through said collet, one end of said cannula holder extending through said collet and having a connection for removably attaching a cannula and catheter, said cannula holder having a shoulder trap adjacent said connection, said other end of said cannula holder disposed in said forward end of inner barrel, said other end of said cannula holder having an enlarged flange, a first resilient spring disposed in said outer barrel about said restricted opening, said spring engaging said circumferential ring of said inner barrel and urging said cannula holder toward said outer barrel, said shoulder trap engaging said portion of said collet thereby wedging said collet in said restricted opening, a second spring disposed in said collet about said cannula holder and engaging said enlarged flange thereby urging said cannula holder into said inner barrel.