Prosthetic hip implantation method and apparatus
First Claim
1. A method for preparing the medullary canal of a femur to receive a prosthetic fernoral implant having proximal and distal stem portions, comprising the steps:
- providing a template, a gauge, a reamer, a metaphyseal template, a chise and a broach;
placing the template generally corresponding to the prosthetic hip implant on an x-ray of the femur to determine the level of an osteotomy cut with respect to the sulcus of the femur;
marking said determined position on the femur using the gauge locating off the sulcus;
performing the osteotomy by resecting the femur;
reaming the distal medullary canal to a predetermined depth with the reamer having an elongated shaft and a shape mimicking the shape of the distal stem portion of the prosthetic femoral implant;
placing the metaphyseal template on said elongated shaft to determine a proper anteversion/retroversion orientation thereof;
locking said metaphyseal template in place upon determining said proper anteversion/retroversion orientation;
placing the chisel having a shape generally corresponding to a lateral portion of the fernoral implant at a proper alignment on said metaphyseal template and removing bone at the osteotomy level to form the proper lateral opening in said canal;
removing said template and said chisel; and
placing the proximal broach over said elongated shaft of said reamer and shaping the proximal portion of said cavity with a broach having a shape generally conforming to the proximal portion of said implant.
6 Assignments
0 Petitions
Accused Products
Abstract
A surgical instrument system for preparing the medullary canal of the femur for implanting a prosthetic femoral component includes a template to be used in determining osteotomy position from an x-ray. A gauge is provided to locate and mark this position on the anterior femur. A distal reamer having an elongated drive shaft is used to form the canal to receive the distal stem of the femoral component. A metaphyseal template is used to determine the proper anteversion/retroversion and a chisel is used to cut the lateral area of the femur, both of which are guided by the elongated reamer shaft. A proximal broach also guided by the reamer shaft is used to shape the proximal medullary canal.
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Citations
23 Claims
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1. A method for preparing the medullary canal of a femur to receive a prosthetic fernoral implant having proximal and distal stem portions, comprising the steps:
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providing a template, a gauge, a reamer, a metaphyseal template, a chise and a broach; placing the template generally corresponding to the prosthetic hip implant on an x-ray of the femur to determine the level of an osteotomy cut with respect to the sulcus of the femur; marking said determined position on the femur using the gauge locating off the sulcus; performing the osteotomy by resecting the femur; reaming the distal medullary canal to a predetermined depth with the reamer having an elongated shaft and a shape mimicking the shape of the distal stem portion of the prosthetic femoral implant; placing the metaphyseal template on said elongated shaft to determine a proper anteversion/retroversion orientation thereof; locking said metaphyseal template in place upon determining said proper anteversion/retroversion orientation; placing the chisel having a shape generally corresponding to a lateral portion of the fernoral implant at a proper alignment on said metaphyseal template and removing bone at the osteotomy level to form the proper lateral opening in said canal; removing said template and said chisel; and placing the proximal broach over said elongated shaft of said reamer and shaping the proximal portion of said cavity with a broach having a shape generally conforming to the proximal portion of said implant. - View Dependent Claims (2, 3)
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4. A set of instruments for preparing the femoral canal of a femur for receiving a fernoral component having a proximal and distal stem portion comprising:
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a reamer having a shape corresponding to the distal stem portion and having an elongated drive shaft extending proximally therefrom; a template having a bore therein for slidably receiving said elongated drive shaft and being rotatable thereon, said template having an alignment element thereon; a chisel having a bore for slidably receiving said elongated drive shaft and having an alignment element thereon for engaging said alignment element on said template, said chisel for partially forming a lateral side of said femoral canal; and a first broach having a bore therein for receiving said elongated shaft for forming a proximal portion of said fernoral canal while mounted on said shaft. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A kit of instruments for preparing the medullary canal of the femur to receive a hip prosthesis fernoral component comprising:
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a distal reamer having an elongated shaft extending proximally from a distal portion, said distal portion having a shape generally corresponding to the shape of a distal portion of said fernoral component; a metaphyseal template having a body including a first bore for slidably receiving said elongated shaft of said reamer and a second bore for receiving an anchor element, said template having a proximally extending alignment element; and a chisel having a body with a bore therein for slidably receiving said elongated shaft of said reamer and an aperture for receiving said proximally extending alignment element of said template. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A fernoral neck resetlion and reaming depth guide for using the sulcus of the femur as a guide surface and exclusive support surface comprising:
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an elongated guide shaft having a calibrated scale along the length thereof; an arm integral with said guide shaft and extending transversely from said guide shaft for engaging the sulcus of the femur and positioning said guide shall in a fixed position externally to the femur with said shall extending in a direction generally parallel to the longitudinal axis of the femur; a marking platform slidably mounted on said guide shaft and having a looking element for locking the platform on said guide shaft with respect to the calibrations thereon; and where said arm integral with said guide shaft rests on said sulcus to provide the sole support of said femoral neck resection and reaming depth guide. - View Dependent Claims (17)
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18. A reaming device for forming the medullary canal and the trochanteric region of the femur for receiving a prosthetic hip stem comprising:
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a distal reamer having a shape corresponding to the distal portion of the hip stem; an elongated drive shaft coupled to a proximal end of said distal reamer and extending in a proximal direction therefrom; a burr sleeve having a bore for receiving said drive shaft; and an interengagable drive element on said burr and said distal reamer for driving said burr sleeve in unison with said distal reamer upon rotation of said drive shaft. - View Dependent Claims (19, 20, 21)
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22. A set of instruments for preparing the proximal femoral canal of a resected femur for receiving a femoral component having a proximal and distal stem portion comprising:
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a reamer having a shape corresponding to the distal stem portion and having an elongated shaft extending proximally therefrom; a template having a bore therein for slidably receiving said elongated drive shaft and being rotatable thereon, said template having an alignment element thereon; a chisel having a bore for slidably receiving said elongated drive shall and having an alignment element thereon for engaging said alignment element on said template, said chisel for partially forming a lateral side of said proximal femoral canal; a first broach having a bore therein for receiving said elongated shaft for forming a proximal portion of said fernoral canal while mounted on said shaft; and a second broach having a bore for receiving said elongated shaft. - View Dependent Claims (23)
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Specification