Surgical reamer
OwnerKevin T. Stone, Daniel E. Williamson +1inventors
InventorsKevin T. Stone, Daniel E. Williamson, Jane A. Sheetz
Life of this patent
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Abstract
A surgical reamer is used in conjunction with a femoral neck cutting guide to enlarge the intramedullary canal of a resected host femur to expose hard cortical bone. The reamer has a longitudinally fluted cutting head that is flexible and able to bend relative to its longitudinal axis whereby to conform to axial or curved cortical bone surfaces to be engaged by like mating surfaces of a hip prosthesis to be implanted therein. In this regard, the cutting head includes a helical band spiralling between the ends of the cutting head.
Claims24
A set of surgical instrumentalities for replacing a joint with a prosthetic joint, said set of surgical instrumentalities comprising:
- a prosthetic device;
- and
- a surgical reamer for preparing the joint to receive said prosthetic device, said surgical reamer including:
- (a) a cutting head with a longitudinal axis and opposing ends,
- (b) a helical band spiralling around said longitudinal axis and at least partially between said opposing ends of said cutting head, and
- (c) a cutting flute formed in said helical band, wherein said helical band allows said cutting head to flex with said opposed ends lying along relatively offset axes and allows said cutting head to remain along said relatively offset axes during rotation of said reamer.
A surgical reamer for enlarging a cavity within a bone to receive the prosthetic device, said surgical reamer including:
- (a) an elongated shaft having a longitudinal axis;
- and
- (b) a substantially hollow cylindrical cutting head disposed on said elongated shaft having opposed ends, said cutting head having at least one cutting flute and a helical band spiralling around said longitudinal axis at least partially between the ends of the cutting head, said helical band defining a plurality of loops that are spaced from one another and being operable to allow said cutting head to flex relative to said longitudinal axis of said elongated shaft wherein said helical band allows said cutting head to flex with said opposed ends lying along relatively offset axes and allows said cutting head to remain along said relatively offset axes during rotation of said reamer.
A set of surgical instrumentalities for use in the replacement of a hip joint having a femur with a neck portion, said set of surgical instrumentalities comprising:
- a hip prosthesis including a distal segment and a proximal segment,
- a distal canal reamer operable to ream a diaphyseal cavity in the femur for receiving said distal segment of said hip prosthesis;
- a proximal reamer operable to ream a metaphyseal cavity in the femur for receiving a portion of said proximal segment;
- a femoral neck reamer operable to ream the neck portion of the femur for receiving a portion of said proximal segment, said femoral neck reamer having a shaft and a cylindrical longitudinally fluted cutting head having opposed ends, at least a portion of said cutting head being a helical band defining a plurality of cutting portions that are spaced from one another to enable said cutting head to flex relative to said shaft, said helical band allowing said cutting head to flex with said opposed ends lying along relatively offset axes and allowing said cutting head to remain along said relatively offset axes during rotation of said reamer;
- and
- a proximal reaming guide for positioning said neck reamer relative to the femur to ream said neck portion, said proximal reaming guide including a guide arm operable to guide said shaft of said femoral neck reamer.
A set of surgical instrumentalities for replacing a hip joint having a femur in which a metaphyseal cavity has been formed, said set of surgical instrumentalities comprising a prosthetic device, a reamer adapted to extend into the metaphyseal cavity of a host femur, and a reaming guide for use with the reamer in preparing the metaphyseal cavity of the femur for said prosthetic device,
- said reamer comprising a hollow cutting head having at least one cutting flute and a shaft arranged coaxially along a longitudinal axis, the cutting head having a helical band spiralling between the opposing ends of said cutting head, wherein said helical band allows said cutting head to flex with said opposed ends lying along relatively offset axes and allows said cutting head to remain along said relatively offset axes during rotation of said reamer;
- and
- said reaming guide comprising an axial guide body having an upper end formed as a handle and a lower end supported in the femur, and a guide arm extending from the guide body, said guide arm having a bearing surface for engagement by said shaft of said reamer to guide said shaft when said cutting head is rotated in the metaphyseal cavity whereby to enlarge the metaphyseal cavity.
Dependencies are inferred from the claim text.