Surgical instrument

Abstract

In a surgical instrument comprising a tool which is oscillatingly pivotable about an axis of rotation and a rotatingly driven drive shaft which by means of an eccentric causes an oscillating lever which is rotationally fixedly connected to the tool to pivot oscillatingly back and forth, in order to achieve a simplified adaptation of the pivoting angle to the respective tool, it is proposed that the drive shaft comprise adjacent to each other at least two eccentrics with different eccentricity, that an oscillating lever pivotable about the axis of rotation of the tool be associated with each eccentric, and that the tool be rotationally fixedly connected to only one of the oscillating levers.

1 . Surgical instrument comprising a tool which is oscillatingly pivotable about an axis of rotation and a rotatingly driven drive shaft which by means of an eccentric causes an oscillating lever which is rotationally fixedly connected to the tool to pivot oscillatingly back and forth, wherein the drive shaft comprises at least two eccentrics with different eccentricity adjacent to each other, an oscillating lever pivotable about the axis of rotation of the tool is associated with each eccentric, and the tool is rotationally fixedly connected to only one of the two oscillating levers.  
     
     
         2 . Instrument in accordance with  claim 1 , wherein different tools are rotationally fixedly connected to different oscillating levers.  
     
     
         3 . Instrument in accordance with  claim 1 , wherein the tool in a working position is releasably connected to one oscillating lever and is pullable out of this working position out of the instrument.  
     
     
         4 . Instrument in accordance with  claim 3 , wherein the tool is securable in the pushed-in working position against axial displacement in the instrument.  
     
     
         5 . Instrument in accordance with  claim 1 , wherein the rotationally fixed connection is formed by radial recesses and projections which enter into and rest against these recesses in circumferential direction interlocking with one another and allowing axial displacement of the tool relative to the drive shaft.  
     
     
         6 . Instrument in accordance with  claim 2 , wherein the rotationally fixed connection is formed by radial recesses and projections which enter into and rest against these recesses in circumferential direction interlocking with one another and allowing axial displacement of the tool relative to the drive shaft.  
     
     
         7 . Instrument in accordance with  claim 5 , wherein the projection is formed by an axially parallel, radially protruding rib.  
     
     
         8 . Instrument in accordance with  claim 5 , wherein the recess is formed by an axially parallel groove.  
     
     
         9 . Instrument in accordance with  claim 6 , wherein the recess is formed by an axially parallel groove.  
     
     
         10 . Instrument in accordance with  claim 8 , wherein each oscillating lever carries a recess, and each tool has only one projection which is arranged in axial direction along the tool so as to form a rotational connection with only one oscillating lever.  
     
     
         11 . Instrument in accordance with  claim 5 , wherein the angular position of the projections and recesses, respectively, on the oscillating levers is the same.  
     
     
         12 . Instrument in accordance with  claim 11 , wherein guides which narrow in the direction of insertion of the tool are provided to rotate the tool such that the projections and recesses are oriented in alignment with one another.  
     
     
         13 . Instrument in accordance with  claim 12 , wherein the guides are formed by a narrowing longitudinal groove in a bearing sleeve surrounding the tool.  
     
     
         14 . Instrument in accordance with  claim 1 , wherein the eccentrics are arranged in a different angular position.  
     
     
         15 . Instrument in accordance with  claim 14 , wherein in the case of two eccentrics, these are offset in opposite direction.