Surgical trephine
AssigneeBenoist Girard SAS
InventorsJohn Andrew Storer, Jean-Claude Bachelier
Life of this patent
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Abstract
A surgical trephine is adapted for boring an opening in tamped bone chips and includes a hollow elongate body portion having an internal bore and the distal end of which has an annular cutting rim. A piston is located in the bore with a piston surface facing towards the cutting rim and a tool for moving the piston in the bore. With this device an elongate cavity can be cut in the bone chips. The debris from the cutting the bore enters the distal end of the internal bore and slowly pushes the piston up the bore away from the distal end. When the hollow elongate body portion is withdrawn from the cavity, the chips can then be easily dislodged from the bore by displacing the piston.
Claims20
The method for using a surgical trephine in forming a cavity in the medullary canal of a femur comprising:
- inserting a guide wire into the medullary canal;
- inserting a trephine having a distal end, a proximal, and a hollow tubular portion over the guide wire, the trephine including a bore with cutting teeth formed around an annular end surface of said bore, the hollow tubular portion including a piston, said piston having a cannulation for slidably receiving the guide wire;
- rotating the trephine to cut a cavity in the canal;
- limiting the movement of the piston with respect to said hollow tubular portion by providing a stop on an inner surface of the bore for engaging a stop on said piston to prevent the disassembly of said piston from said trephine;
- and
- removing material cut from the canal from the trephine by removing said trephine from the canal and activating said piston to force material within the hollow tubular portion from the annular end of said bore.
A surgical trephine adapted for boring an opening in the tamped bone chips comprising a distal end and a hollow elongate body portion having an internal bore, a stop extending from said body portion into said bore, the distal end has an annular cutting rim, a piston located in said bore with a piston surface facing towards said cutting rim, said piston movable in the bore, said piston having a stop for engaging the stop on the inner bore for limiting movement of the piston in the bore in a direction away from the distal end.
A surgical cutting instrument for cutting a bore in a bone comprising:
- an elongate tubular body having a wall surrounding an internal bore and an annular open end;
- a cutting element formed around said annular open end;
- a piston having a stop thereon slidably received within said bore;
- a piston actuator coupled to said piston for moving said piston towards said open end of said tubular body;
- and
- a stop extending from said wall into said bore for engaging said stop on the piston to limit the movement of the piston away from the open end of said tubular body.
Dependencies are inferred from the claim text.