Apparatus and method for implanting a prosthetic acetabular cup and then testing the stability of the implant
First Claim
1. A method for implanting a prosthetic acetabular cup comprising the steps of:
- providing a prosthetic acetabular cup;
preparing a recess within the acetabular area of the pelvic bone to receive prosthetic acetabular cup;
implanting the prosthetic acetabular cup within said recess by imparting an implantation force upon the prosthetic acetabular cup; and
testing the stability of the implanted acetabular cup by imparting a torquing moment to said implanted acetabular cup and monitoring the relationship between the magnitude of the torquing moment and movement of the acetabular cup.
2 Assignments
0 Petitions
Accused Products
Abstract
An implantation instrument and methods for reliably implanting a prosthetic acetabular cup in the acetabular area of the pelvic bone during a total prosthetic hip implant operation are disclosed. Such implantation device and methods also provide means for determining the adequacy or strength of the implant.
The implantation device includes means for receiving an implantation force from, for example a mallet, and imparting this force to press fit the prosthetic acetabular cup into a recess formed in the acetabular area of the pelvic bone. The apparatus also includes means for testing the strength or adequacy of the acetabular cup implant by receiving and imparting a torquing moment. Finally, the apparatus includes an alignment arm which is laterally displaced from the longitudinal axis of the apparatus, and selectively fixed or rotatably connected, in order to implant the prosthetic acetabular cup in the desired orientation.
The prosthetic acetabular cup contains a threaded recess therethrough, while the implantation instrument contains a threaded tip, for releasably connecting the acetabular cup and the implantation device. The cup is able to withstand forces associated with the steps of applying an implanting force and a torquing moment to test the stability of the implant.
376 Citations
58 Claims
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1. A method for implanting a prosthetic acetabular cup comprising the steps of:
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providing a prosthetic acetabular cup; preparing a recess within the acetabular area of the pelvic bone to receive prosthetic acetabular cup; implanting the prosthetic acetabular cup within said recess by imparting an implantation force upon the prosthetic acetabular cup; and testing the stability of the implanted acetabular cup by imparting a torquing moment to said implanted acetabular cup and monitoring the relationship between the magnitude of the torquing moment and movement of the acetabular cup. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A method for implanting a prosthetic acetabular cup comprising the steps of:
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providing a prosthetic acetabular cup having a threaded recess therein; preparing a recess within the acetabular area of the pelvic bone to receive the prosthetic acetabular cup by removing bone and other surrounding tissue in the acetabular area, the diameter of said recess being slightly smaller that the diameter of said cup; releasably fixing said acetabular cup to an implantation instrument comprising; an end which is proximal to the prosthetic acetabular cup and another end which is distal thereto; a threaded connector tip at the proximal end for releasably fixing said implantation instrument to said acetabular cup; an enlarged head at the distal end for receiving an implantation force; a rigid shaft disposed between said enlarged head and said threaded connector tip for imparting an implantation force from said enlarged head to the prosthetic acetabular cup; and a flange disposed along said rigid rod for receiving a torquing moment, said rigid rod imparting said torquing moment from said flange to said connector tip, said acetabular cup being threadably attached by screwing said threaded connector tip of the implantation instrument into said threaded recess of the acetabular cup; implanting said acetabular cup in a desired orientation by exerting an implantation force upon said implantation instrument sufficient to conformingly fit the prosthetic acetabular cup within said recess within the acetabular area; and exerting a torquing moment upon the implantation instrument whereby the stability of the implant is determined while simultaneously applying a stabilizing force to the implantation instrument, said stabilizing force maintaining said acetabular cup in substantially the same orientation as it was after the implanting step, wherein an adequate implant is determined by observing the immobility of the prosthetic acetabular cup relative to tissue in the acetabular area upon applying a predetermined torquing moment. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44)
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45. An apparatus comprising an implantation instrument for implanting a prosthetic acetabular cup, the apparatus including:
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a central shaft; attachment means disposed at a first end of said central shaft for releasably fixing the implantation instrument to a prosthetic acetabular cup; means for receiving an implantation force disposed at a second end of said central shaft; means for imparting an implantation force disposed at a second end of said central shaft; means for imparting an implantation force to a prosthetic acetabular cup, said means for imparting an implantation force including said central shaft and said attachment means; means for receiving a torquing moment including a flange disposed on said central shaft, said flange having a surface that is complementary to the shape of a connecting end of a torquing device, said complementary surface including at least one substantially flat surface, wherein the torquing device can be releasably connected to said flange by engaging the connecting end of the torquing device and the complementary surface of the flange; and means for imparting a torquing moment to a prosthetic acetabular cup, said means for imparting a torquing moment including said central shaft and said attachment means. - View Dependent Claims (46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58)
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Specification