MECHANICALLY GUIDED IMPACTOR FOR HIP ARTHROPLASTY
First Claim
1. An impactor for positioning and inserting an acetabular cup into an acetabulum of a pelvis during hip arthroplasty, the impactor comprising:
- an elongated body including a stem having a proximal end and an opposed distal end;
a cup-engaging element disposed at the proximal end of the stem, the cup-engaging element being adapted to engage the acetabular cup for insertion into the acetabulum;
an impact element disposed at the distal end of the stem and adapted to receive a force used to drive the acetabular cup into the acetabulum, the stem defining a longitudinal axis extending between the cup-engaging element and the impact element, the longitudinal axis thereby defining an impact axis;
a guide element mounted to the elongated body, the guide element having first and second openings aligned with each other to define an axial passage extending therebetween, a guide axis centrally disposed within the first and second openings and extending through the axial passage, the first and second openings being spaced apart an axial distance along said guide axis, the first and second openings and the axial passage receiving a guide pin therethrough, the guide pin adapted to be pinned in a fixed position relative to the pelvis, the guide pin defining a pin axis extending longitudinally through a center thereof; and
wherein the guide element provides a mechanical orientation guide which restricts an angular orientation of the impactor relative to the guide pin when the guide pin is pinned in the fixed position relative to the pelvis and received through the first and second openings of the guide element, and wherein centering the openings of the guide element relative to the guide pin in the fixed position achieves a desired orientation of the impactor within a predetermined angular tolerance.
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Accused Products
Abstract
An impactor for positioning and inserting an acetabular cup into an acetabulum of a pelvis during hip arthroplasty is described. The impactor includes a guide element mounted to an elongated body and including first and second openings aligned with each other to define an axial passage. The first and second openings and the axial passage receive a guide pin therethrough that is pinned in a fixed position to the pelvis. The guide element provides a mechanical orientation guide which restricts an angular orientation of the impactor relative to the guide pin when the guide pin is pinned in the fixed position relative to the pelvis and received through the first and second openings of the guide element. Centering the openings of the guide element relative to the guide pin in the fixed position accordingly achieves a desired orientation of the impactor within a predetermined angular tolerance.
37 Citations
22 Claims
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1. An impactor for positioning and inserting an acetabular cup into an acetabulum of a pelvis during hip arthroplasty, the impactor comprising:
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an elongated body including a stem having a proximal end and an opposed distal end; a cup-engaging element disposed at the proximal end of the stem, the cup-engaging element being adapted to engage the acetabular cup for insertion into the acetabulum; an impact element disposed at the distal end of the stem and adapted to receive a force used to drive the acetabular cup into the acetabulum, the stem defining a longitudinal axis extending between the cup-engaging element and the impact element, the longitudinal axis thereby defining an impact axis; a guide element mounted to the elongated body, the guide element having first and second openings aligned with each other to define an axial passage extending therebetween, a guide axis centrally disposed within the first and second openings and extending through the axial passage, the first and second openings being spaced apart an axial distance along said guide axis, the first and second openings and the axial passage receiving a guide pin therethrough, the guide pin adapted to be pinned in a fixed position relative to the pelvis, the guide pin defining a pin axis extending longitudinally through a center thereof; and wherein the guide element provides a mechanical orientation guide which restricts an angular orientation of the impactor relative to the guide pin when the guide pin is pinned in the fixed position relative to the pelvis and received through the first and second openings of the guide element, and wherein centering the openings of the guide element relative to the guide pin in the fixed position achieves a desired orientation of the impactor within a predetermined angular tolerance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 21)
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20. A patient-specific guide pin installation jig for installing a guide pin in a predetermined fixed position and orientation on a pelvis in preparation for hip arthroplasty, comprising:
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an acetabular element having an acetabular shell mounted thereto which is configured and formed for a precise mating fit within the acetabulum of the specific patient; a jig body spaced apart from the acetabular element and proximally extending so as to abut with at least one of a rim of the acetabular and another preselected anatomical landmark to define a predetermined position and/or orientation of the jib body; and a pin guide element connected with the jig body and the acetabular element, the pin guide element having a guide hole extending therethrough and adapted to receive at least one of a drill bit and the guide pin, the guide element permitting the guide pin to be pinned to the pelvis in the predetermined position and orientation.
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22. A method for installing an acetabular cup into an acetabulum of a pelvis during hip arthroplasty, comprising:
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a) seating a guide pin installation jig into the acetabulum; b) using the guide pin installation jig to dispose a guide pin in a pre-planned position and orientation, and driving the guide pin into the pelvis at said pre-planed position and orientation; c) providing an impactor having at least a guide element with first and second axially spaced apart rings circumscribing respective openings which receive the guide pin therethrough, wherein the guide element provides a mechanical orientation guide which restricts an angular displacement of the impactor relative to the guide pin within a predetermined angular tolerance; d) feeding the guide pin through the openings of the guide element of the impactor, and placing a cup-engaging element on a proximal end of the impactor within the acetabulum; e) aligning the impactor at an angular orientation such that the guide pin is substantially centered within the openings of the guide element on the impactor, whereby the impactor is disposed at a pre-planed desired orientation within the predetermined angular tolerance; and f) once the impactor is in the desired orientation as defined by the guide element, impacting the prosthetic acetabular cup into the acetabulum using the impactor.
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Specification