Medical implant extraction device

Abstract

Extraction instruments and systems for use in revision arthroplasty are provided. The extraction instruments are shaped and configured to fit within the typically tight confines in which revision arthroplasty is performed, and to enhance the surgeon's control over the axis, quantum and speed of the force that is required be applied to disrupt a bone-to-prosthesis bond. This enables completion of a revision arthroplasty to proceed more quickly, and with reduced risk that unwanted movements might cause accidental injury to nearby vital structures.

1 . An orthopedic extraction instrument for use in revision arthroplasty, the extraction instrument comprising an elongate shaft having a proximal end and a distal end, and an elongate reverse extraction blade connected to and spaced apart from said proximal end of said shaft by a bridge, said reverse extraction blade extending from said bridge generally parallel to and in an direction towards the distal end of said shaft, said reverse extraction blade comprising at least one cutting edge disposed at the free end thereof. 
     
     
         2 . The orthopedic extraction instrument of  claim 1 , wherein said reverse extraction blade further comprises at least one cutting edge disposed along at least one lateral edge thereof. 
     
     
         3 . The orthopedic extraction instrument of  claim 2 , wherein said reverse extraction blade has a cross-section that is one of flat, convex and skewed convex. 
     
     
         4 . The orthopedic extraction instrument of  claim 1 , wherein said reverse extraction blade is inclined at between 0° and 45° relative to the longitudinal axis of the shaft. 
     
     
         5 . The orthopedic extraction instrument of  claim 1 , wherein said bridge has a cross-section that is one of flat, convex and concave along the portion thereof that is disposed toward the distal end of said shaft. 
     
     
         6 . The orthopedic extraction instrument of  claim 1 , further comprising a handle at the distal end of said shaft. 
     
     
         7 . The orthopedic extraction instrument of  claim 6 , further comprising a striking plate proximally adjacent the handle. 
     
     
         8 . The orthopedic extraction instrument of  claim 7 , further comprising a slap hammer slidably engaged with said shaft proximal to said striking plate. 
     
     
         9 . An orthopedic extraction instrument for use in revision arthroplasty, the extraction instrument comprising an elongate shaft having a proximal end and a distal end, and a generally planar reverse extraction blade connected to the proximal end of the shaft and extending generally perpendicularly therefrom. 
     
     
         10 . The orthopedic extraction instrument of  claim 9 , wherein said reverse extraction blade comprises at least one cutting edge along the edge of the blade that is disposed closest to the distal end of said shaft. 
     
     
         11 . The orthopedic extraction instrument of  claim 9 , wherein said at least one cutting edge is angled relative to the axis of said shaft at an angle of between 75° to 120°. 
     
     
         12 . The orthopedic extraction instrument of  claim 9 , wherein a notch is formed in said at least one edge. 
     
     
         13 . The orthopedic extraction instrument of  claim 9 , further comprising a handle at the distal end of said shaft. 
     
     
         14 . The orthopedic extraction instrument of  claim 13 , further comprising a striking plate proximally adjacent the handle. 
     
     
         15 . The orthopedic extraction instrument of  claim 14 , further comprising a slap hammer slidably engaged with said shaft proximal to said striking plate. 
     
     
         16 . An orthopedic extraction instrument for use in revision arthroplasty, the extraction instrument comprising an elongate shaft having a proximal end and a distal end, a pivot edge formed at or near the proximal end of the shaft, and an elongate extraction blade connected to the pivot edge at one of a plurality of inclinations and angles with respect thereto. 
     
     
         17 . The orthopedic extraction instrument of  claim 16 , wherein said pivot edge is flush. 
     
     
         18 . The orthopedic extraction instrument of  claim 16 , wherein said pivot edge has a height that is between 0.5 mm and 15 mm. 
     
     
         19 . The orthopedic extraction instrument of  claim 16 , wherein the cross-section of said pivot edge is one of flat, convex and concave along the portion thereof that is disposed toward the proximal end of said shaft. 
     
     
         20 . The orthopedic extraction instrument of  claim 16 , wherein said extraction blade further comprises at least one cutting edge disposed along at least one lateral edge thereof. 
     
     
         21 . The orthopedic extraction instrument of  claim 16 , wherein said extraction blade has a cross-section that is one of flat, convex and skewed convex. 
     
     
         22 . The orthopedic extraction instrument of  claim 16 , wherein the axial length of said extraction blade is relatively short as compared to the length of said shaft. 
     
     
         23 . The orthopedic extraction instrument of  claim 16 , further comprising a handle at the distal end of said shaft. 
     
     
         24 . The orthopedic extraction instrument of  claim 21 , further comprising a striking plate proximally adjacent the handle. 
     
     
         25 . The orthopedic extraction instrument of  claim 22 , further comprising a slap hammer slidably engaged with said shaft proximal to said striking plate. 
     
     
         26 . A system of orthopedic extraction instruments use in revision arthroplasty of a knee joint, said system comprising the orthopedic extraction instruments of at least  claims 1 ,  9  and  16 . 
     
     
         27 . A kit of orthopedic extraction instruments use in revision arthroplasty of a knee joint, said kit comprising the orthopedic extraction instruments of at least  claims 1 ,  9  and  16 .