Device and method for preparing a recess in a bone

Abstract

A punching device for preparing a recess in a bone has a punching tool usable for such a punching device. An implant usable with the punching tool is provided and a method for preparing a recess in a bone are disclosed. The punching device comprises an ultrasonic sonotrode and a punching tool which is fixable to the sonotrode at its proximal extremity. At its distal extremity, the punching tool has a thin-walled portion having a non-rotational symmetric cross-section. By ultrasonic vibration of the punching tool, the thin-walled portion can be forced into a bone thereby preparing a recess of which is not rotationally symmetric. Subsequently, an implant can be held in such recess. Due to its lack of rotational symmetry, the implant may absorb rotational forces around its longitudinal axis.

1 . A punching device for preparing a recess in a bone, the punching device comprising:
 an ultrasonic sonotrode,   a punching tool being fixable to the sonotrode at its proximal extremity,   wherein, at its distal extremity, the punching tool has a thin-walled portion having a cross section not being rotationally symmetric.   
     
     
         2 . The punching device according  claim 1 ,
 wherein the thin-walled portion has a wall thickness (t) of less than 2 mm.   
     
     
         3 . The punching device according to  claim 1 ,
 wherein the thin-walled portion has an annular cross section.   
     
     
         4 . The punching device according to  claim 1 ,
 wherein the thin-walled portion has a non-symmetric cross section.   
     
     
         5 . The punching device according to  claim 1 ,
 wherein the punching tool comprises a bio-compatible material.   
     
     
         6 . The punching device according to  claim 1 ,
 wherein the punching tool comprises a bio-resorbable material.   
     
     
         7 . The punching device according to  claim 1 ,
 wherein the thin-walled portion has a lateral surface providing a high surface friction.   
     
     
         8 . The punching device according to  claim 1 ,
 further comprising an ultrasonic generator.   
     
     
         9 . The punching device according to  claim 8 ,
 wherein the ultrasonic generator is adapted to excite the punching tool with a vibration frequency of between 10 kHz and 100 kHz.   
     
     
         10 . The punching device according to  claim 8 ,
 wherein the ultrasonic generator is adapted to excite the punching tool with a vibration amplitude of between 1 μm and 300 μm.   
     
     
         11 . A punching tool usable for preparing a recess in a bone,
 wherein the punching tool is adapted to be used in a punching device according to  claim 1 .   
     
     
         12 . An implant to be inserted into a bone,
 wherein the implant is adapted to be used as a punching tool for a punching device according to  claim 1 .   
     
     
         13 . A method for preparing a recess in a bone, the method comprising:
 providing a punching device according to  claim 1 ;   abutting the punching tool on the bone;   vibrating the punching tool with ultrasonic vibrations and pushing the punching tool into the bone.   
     
     
         14 . The method of  claim 13 , further comprising:
 removing the punching tool from the bone.   
     
     
         15 . The method of  claim 13 , further comprising:
 releasing the punching tool from the sonotrode.