Self Retaining Acetabular Component Alignment Device for Total Hip Arthroplasty
First Claim
1. An alignment device for guiding the placement of the acetabular component during total hip arthroplasty comprising an aligner and an insertion rod, said aligner comprising a longitudinal member with two ends, wherein the distal end is adapted to engage with an anatomical landmark, and the proximal end is provided with means of coupling in a reproducible way to the insertion rod, said insertion rod comprising a longitudinal member with a distal end adapted to detachably hold the acetabular component, a midsection adapted to be releasably coupled to the proximal end of the aligner, and a proximal end adapted for impaction, whereby when the aligner is engaged with the anatomical landmark, the acetabular component is placed in the desired orientation.
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Abstract
A spring-loaded, self-retaining, clamp like alignment device used to guide the placement of the acetabular component during total hip arthroplasty is disclosed. The device comprises two longitudinal elements: the first longitudinal element has a proximal end with a handle, a groove within and a spring loaded into the groove. The second longitudinal element has a distal end to which an acetabular component is attached and a mid-section that fits into the groove of the first longitudinal element and a proximal end with a knob. When the hook present at the distal end of the first longitudinal element is placed into the sciatic notch in the pelvic bone and the proximal end clipped to the mid-section of the second longitudinal element, the acetabular component at the distal end of the second longitudinal element is consistently positioned in the acetabulum at 45-degree abduction and 20-degree anteversion. While the surgeon impacts the acetabular component into place the spring located in the proximal end of the first longitudinal element maintains the proper alignment of the acetabular component and keeps the deep part of the clamp from injuring structures traversing the sciatic notch.
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Citations
16 Claims
- 1. An alignment device for guiding the placement of the acetabular component during total hip arthroplasty comprising an aligner and an insertion rod, said aligner comprising a longitudinal member with two ends, wherein the distal end is adapted to engage with an anatomical landmark, and the proximal end is provided with means of coupling in a reproducible way to the insertion rod, said insertion rod comprising a longitudinal member with a distal end adapted to detachably hold the acetabular component, a midsection adapted to be releasably coupled to the proximal end of the aligner, and a proximal end adapted for impaction, whereby when the aligner is engaged with the anatomical landmark, the acetabular component is placed in the desired orientation.
- 9. A method of placing an acetabular component in desired orientation during hip replacement, comprising the steps of (a) attaching the acetabular component to a distal end of the insertion rod, (b) engaging a distal end of an aligner with an anatomical landmark, (c) inserting the acetabular component into the entrance of the acetabulum, (d) coupling a proximal end of the aligner with a mid-section of the insertion rod, thereby positioning the acetabular component in the desired orientation, (e) impacting the proximal end of the insertion rod thereby seating the acetabular component in place, and (f) detaching the acetabular component from the insertion rod.
Specification