Hip joint prosthesis to be permanently anchored within a femur of a patient
First Claim
1. A fixture for a hip joint prosthesis adapted in use to be permanently anchored in a channel provided in a human femur which extends forwardly into the femur neck from an opening in a femur neck section exposed by resection of the femur head towards a position below the greater trochanter of the femur and comprising a rearward section which extends forwardly from the opening and transversely to the outer surface layer of cortical bone of the femur in at least three locations and a co-axial forward section which extends forwardly from the rearward section, the fixture comprising:
- a rearward fixture component part for anchorage in the rearward section of the channel which is of such transverse dimensions as to extend to at least three cortical bone locations when anchored in the rearward section of the channel; and
a forward fixture component part for anchorage in the forward section of the channel;
wherein a forward end of the rearward fixture component part and a rearward end of the forward fixture component part are adapted to interlock when the fixture component parts are anchored in their respective sections of the channel and wherein securing means are provided for biasing the interlocking end of one of the fixture component parts transversely against the interlocking end of the other fixture component part to secure the forward and rearward fixture component parts together when the fixture component parts are anchored in their respective sections of the channel.
2 Assignments
0 Petitions
Accused Products
Abstract
A hip joint prosthesis to be permanently anchored in a patient'"'"'s hip is disclosed. The prosthesis comprises an attachment part for a ball unit designed to be anchored in the neck of a human femur. The attachment part comprises a primary fixture which may be an elongate anchoring element which is intended to be inserted into a channel extending through the femoral collum. The prosthesis also includes a secondary fixture for carrying a ball intended to be attached to the collum after removal of the head of the collum. The primary fixture and the secondary fixture are connected to each other. The prosthesis is preferably designed so that the length of the primary fixture terminates close to the head of the collum. The secondary fixture preferably comprises a plug-like part which is intended to be inserted in a cylindrical countersunk recess that is cut into the cancellous bone of the collum and which extends to the cortical bone in at least three locations.
151 Citations
12 Claims
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1. A fixture for a hip joint prosthesis adapted in use to be permanently anchored in a channel provided in a human femur which extends forwardly into the femur neck from an opening in a femur neck section exposed by resection of the femur head towards a position below the greater trochanter of the femur and comprising a rearward section which extends forwardly from the opening and transversely to the outer surface layer of cortical bone of the femur in at least three locations and a co-axial forward section which extends forwardly from the rearward section, the fixture comprising:
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a rearward fixture component part for anchorage in the rearward section of the channel which is of such transverse dimensions as to extend to at least three cortical bone locations when anchored in the rearward section of the channel; and a forward fixture component part for anchorage in the forward section of the channel; wherein a forward end of the rearward fixture component part and a rearward end of the forward fixture component part are adapted to interlock when the fixture component parts are anchored in their respective sections of the channel and wherein securing means are provided for biasing the interlocking end of one of the fixture component parts transversely against the interlocking end of the other fixture component part to secure the forward and rearward fixture component parts together when the fixture component parts are anchored in their respective sections of the channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification