Patent DE-102007055417-A1 (DE)
Title: Surgical forceps comprises handle part comprising two branches pressable against each other, forceps head carried by the handle part, fixing elements and locking means for protecting the elements and the branches against axial displacement
Inventor: KIENZLE KARL-ERNST
IPC: A61B17/30
Filed: 2007-11-20
Abstract: The surgical forceps comprises a handle part comprising two branches (4, 5) pressable against each other, a forceps head (20) carried by the handle part, fixing elements (6, 7), and locking means for protecting the fixing elements and the branches against an axial displacement, when the fixing elements are attached on the branches. Each forceps head is a part of the fixing elements fixed on one of the branches and secured at the branches. Alignment members are intended on the fixing elements and branches and guide the fixing elements and the branches, when fixing the elements on the branches. The surgical forceps comprises a handle part comprising two branches (4, 5) pressable against each other, a forceps head (20) carried by the handle part, fixing elements (6, 7), and locking means for protecting the fixing elements and the branches against an axial displacement, when the fixing elements are attached on the branches. Each forceps head is a part of the fixing elements fixed on one of the branches and secured at the branches. Alignment members are intended on the fixing elements and the branches, and guide the fixing elements and the branches, when fixing the fixing elements on the branches in a defined length relative to the branches. For forming a socket connection between the branches and the fixing elements, one of the two parts comprises a receptacle and the other comprises a bearing pin lying in the inner wall. The locking means comprises a projection and a return switch, which is flexibly engaged in the attachment of the fixing element. The receptacle has a window, in which the projection merges at the bearing pin, if the fixing element is attached on the branches, and is surrounded in the area of the window of a stabilization housing. The bearing pin in the range of the locking protuberance comprises a diametric passage and is partitioned into two flexible arms lying next to each other. The alignment members of the branches and the fixing elements are orientation guides, which have a guidance surface, which is present together with the attachment of the fixing element on the branches so that the fixing element guides relative to the branches into the defined position. One of the orientation guides is a spring, so that the guidance surface is flexibly pressed against each other. One of the two orientation guides is an extension of the bearing pin. One of the guidance surfaces is bent relative to the direction of attachment of the fixing elements. Each forceps head is formed as ceramic component with an electrically insulating region (22) from a ceramic material and with a region (21) from an electrically conductive ceramic material, which has electrical conductivity by embedding electrically conductive particles (30-70 vol.%). The electrically insulative region and the electrically conductive region form a monolithic sintered body. The size of the non-conducting ceramic particles and the conductive particles in the electrically conductive ceramic material is 3-50 mu m. Empty spots are arranged between non-conducting ceramic particles and electrically conductive particles in the electrically conductive ceramic material. The size of the empty spots is 0.5-0.6 mu m. An independent claim is included for a holding device for fixing elements of surgical forceps.