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US 5,683,399 AGranted
Acetabular cup insertion tool
AssigneeStelkast Incorporated
InventorScott A. Jones
Life of this patent
Estimating the term…
Abstract
The present invention provides an insertion tool and an associated acetabular cup implant. The tool includes a housing and an inner expansion pin for expanding the curved ends of resilient expandable arms of a collet on the distal end of the housing. The expandable arms engage corresponding curved surfaces in a groove in the concave surface of an acetabular cup. The tool also includes an actuation assembly which translates a slight rotation of a sleeve member on the housing to longitudinal movement of the expansion pin to radial expansion or contraction of the arms of the collet to engage or disengage the acetabular cup. A positioning assembly is also provided.
Claims20
An apparatus for insertion and extraction of an implant in a desired anatomical location comprising:
- an elongate outer housing having a distal end and a proximal end and defining a hollow portion in at least the distal end thereof, a portion of the distal end being comprised of a plurality of expandable gripping segments;
- an expansion member housed in the hollow portion of the outer housing;
- an actuation assembly for moving the expansion member between an extended position wherein the expansion member expands the gripping segments and a retracted position wherein the gripping segments contract, the actuation assembly comprising a rotatable shell on the outer housing operatively connected to the expansion member such that rotational movement of the shell causes the expansion member to move between the extended and the retracted positions and an actuation member for converting the rotational movement of the shell into movement of the expansion;
- and
- a biasing member for biasing the expansion member in the extended position.
2 more elements
An apparatus for insertion and extraction of an implant in a desired anatomical location comprising:
- an elongate outer housing having a distal end and a proximal end and defining a hollow portion in at least the distal end thereof, a portion of the distal end being comprised of a plurality of expandable gripping segments;
- an expansion member housed in the hollow portion of the outer housing;
- an actuation assembly for moving the expansion member between an extended position wherein the expansion member expands the gripping segments and a retracted position wherein the gripping segments contract, the actuation assembly comprising a rotatable shell on the outer housing operatively connected to the expansion member such that rotational movement of the shell causes the expansion member to move between the extended and the retracted positions and an actuation member for converting the rotational movement of the shell into movement of the expansion member, the actuation member comprising a rotatable sleeve affixed to the shell for movement therewith, the sleeve having opposing semi-spiral pathways in the surface thereof and a pin operatively attached to a proximal end of the expansion member, the pin having opposing ends for sliding engagement with the pathways.
An apparatus for insertion and extraction of an implant in a desired anatomical location comprising:
- an elongate outer housing having a distal end and a proximal end and defining a hollow portion in at least the distal end thereof, a portion of the distal end being comprised of a plurality of expandable gripping segments;
- an elongate rod housed in the hollow portion of the outer housing, the elongate rod having a distal end and a proximal end, the distal end having a beveled edge and the proximal portion having a member operatively connected to the actuation member and being configured for cooperation with the hollow portion of the outer housing for limiting the movement of the elongate rod in the extended direction;
- an actuation assembly for moving the elongate rod between an extended position wherein the elongate rod expands the gripping segments and a retracted position wherein the gripping segments contract, the actuation assembly comprising a rotatable shell on the outer housing operatively connected to the elongate rod such that rotational movement of the shell causes the elongate rod to move between the extended and the retracted positions and an actuation member for converting the rotational movement of the shell into movement of the elongate rod, the elongate rod comprising a rotatable sleeve affixed to the shell for movement therewith, the sleeve having opposing semi-spiral pathways in the surface thereof and a pin operatively attached to the proximal end of the elongate rod, the pin having opposing ends for sliding engagement with the pathways such that rotation of the shell and the sleeve slides the pin distally or proximally in the pathways for movement of the elongate rod in the extended or retracted positions, respectively.
An implant assembly comprising:
- an acetabular cup implant having an outer surface, a generally concave inner surface, and an annular groove formed in the inner surface;
- a tool for inserting and removing the implant from a desired anatomical location comprising:
- (a) an elongate outer housing having a distal end and a proximal end and defining a hollow portion in at least the distal end thereof, the distal end being comprised of a plurality of expandable gripping segments for engagement with the groove of the implant;
- (b) an expansion member housed in the hollow portion of the outer housing;
- (c) an actuation assembly for moving the expansion member between an extended position wherein the expansion member expands the gripping segments for locking engagement with the groove of the implant and a retracted position wherein the gripping segments contract for release of the gripping segments from the groove of the implant, the actuation assembly comprising a rotatable shell on the outer housing operatively connected to the expansion member such that rotational movement of the shell causes the expansion member to move between the extended and the retracted positions and an actuation member for converting the rotational movement of the shell into movement of the expansion member;
- (d) an assembly for aligning the implant in the desired anatomical location for insertion;
- and
- (e) a biasing member for biasing the expansion member in the extended position.
5 more elements
An implant assembly comprising:
- an acetabular cup implant having an outer surface, a generally concave inner surface, and an annular groove formed in the inner surface;
- a tool for inserting and removing the implant from a desired anatomical location comprising:
- (a) an elongate outer housing having a distal end and a proximal end and defining a hollow portion in at least the distal end thereof, the distal end being comprised of a plurality of expandable gripping segments for engagement with the groove of the implant;
- (b) an elongate rod housed in the hollow portion of the outer housing, the elongate rod having a distal end and a proximal end, the distal end having a beveled edge and the proximal portion having a member operatively connected to the actuation member and being configured for cooperation with the hollow portion of the outer housing for limiting the movement of the elongate rod in the extended direction;
- (c) an actuation assembly for moving the elongate rod between an extended position wherein the elongate rod expands the gripping segments for locking engagement with the groove of the implant and a retracted position wherein the gripping segments contract for release of the gripping segments from the groove of the implant, the actuation assembly comprising a rotatable shell on the outer housing operatively connected to the elongate rod such that rotational movement of the shell causes the elongate rod to move between the extended and the retracted positions and an actuation member for converting the rotational movement of the shell into movement of the elongate rod, the actuation member comprising a rotatable sleeve affixed to the shell for movement therewith, the sleeve having opposing semi-spiral pathways in the surface thereof and a pin operatively attached to the proximal end of the elongate rod, the pin having opposing ends for sliding engagement with the pathways such that rotation of the shell and the sleeve slides the pin distally or proximally in the pathways for movement of the elongate rod in the extended or retracted positions, respectively;
- and
- (d) an assembly for aligning the implant in the desired anatomical location for insertion.
4 more elements
Dependencies are inferred from the claim text.