US Patent 6,361,541
United States Patent and Trademark Office
University of Iowa Research Foundation (Iowa City, IA, US)
A surgical instrument for extracting tissue ingrowth from a permeable member of a catheter implanted in a patient is disclosed. The surgical instrument includes a first extracting component and a second extracting component pivotally coupled to the first extracting component. Both extracting components include a wedge having a blunted leading edge sized and shaped to be lodged adjacent an adhesion interface between the permeable member and tissue of a patient when the extracting components are pivoted to a closed position. The extracting components can then be pivoted to an open position to forcibly pull the tissue ingrowth out of the permeable member. Each wedge further has a concave surface sized and shaped such that, after the complete extraction of the tissue ingrowth from the permeable member, the wedges can clench the permeable member when the first extracting component and the second extracting component are pivoted to a closed position.
Barnhart, William H. Surgical instrument for extracting tissue ingrowth from a permeable member of an implanted catheter. US Patent 6,361,541 filed July 17, 1998 and issued March 26, 2002. https://ir.uiowa.edu/patents/297