Fixation device for surgical instrument parts

A method for fixing first and second instrument parts of a surgical instrument to each other using a fixation device having a longitudinal axis, the fixation device comprising:

• a fixation body configured to accommodate a portion of the first instrument part and a portion of the second instrument part therein, the fixation body comprising a first fastening member and movable first clamping members configured to clampingly engage at least the first instrument part so as to fix at least the first instrument part to the fixation device;
• and
• a first actuation member configured to receive at least a portion of the fixation body and comprising a second fastening member configured to engage with the first fastening member, wherein the first actuation member is configured to exert a clamping force on the first clamping members when the second fastening member is in engagement with the first fastening member, wherein the actuation member comprises cylindrical radially inner and outer surfaces and the clamping members are inclined and have a cone-shape radially outer surface, wherein the first clamping members are dimensioned so that a cross-section of the fixation body at an end of the first clamping members directed towards the first actuation member is smaller than an inner cross section of the cylindrical first actuation member and that the cross-section of the fixation body at the end of the first clamping members directed away from the first actuation member is larger than the inner cross section of the cylindrical first actuation member, wherein the method comprises:
• accommodating a portion of the first instrument part and a portion of the second instrument part in the fixation body;
• and
• fastening the second fastening member of the first actuation member to the first fastening member of the fixation body for fixing at least the first instrument part to the fixation device.

A fixation system comprising:

• a surgical instrument having a first instrument part and a second instrument part;
• and
• a fixation device for fixing the first instrument part to the second instrument part, the fixation device having a longitudinal axis and comprising:
• a fixation body configured to accommodate a portion of the first instrument part and a portion of the second instrument part therein, the fixation body comprising a first fastening member and movable first clamping members configured to clampingly engage at least the first instrument part so as to fix at least the first instrument part to the fixation device;
• and
• a first actuation member configured to receive at least a portion of the fixation body and comprising a second fastening member configured to engage with the first fastening member, wherein the first actuation member is configured to exert a clamping force on the first clamping members when the second fastening member is in engagement with the first fastening member, wherein the first actuation member comprises cylindrical radially inner and outer surfaces and the first clamping members are inclined and have a cone-shape radially outer surface, wherein the first clamping members are dimensioned so that a cross-section of the fixation body at an end of the first clamping members directed towards the first actuation member is smaller than an inner cross section of the cylindrical first actuation member and that the cross-section of the fixation body at the end of the first clamping members directed away from the first actuation member is larger than the inner cross section of the cylindrical first actuation member.