Implant extractor
An implant extractor including a shaft body and a telescoping push rod extending from the shaft body. An adjustor is engaged with the telescoping push rod for adjusting a length of the telescoping push rod. A support arm extends laterally away from the shaft body and a jaw assembly extends from the support arm. The jaw assembly includes a jaw moveable between a locking position and an unlocking position, and a rocker arm operatively engaged with the telescoping push rod and the jaw. The implant extractor provides a line of force spaced from and substantially parallel to an implant to be extracted. As a consequence, there is substantial clearance for an extension handle such as a C-frame or the like which is oftentimes needed to dislodge the implant from surrounding bone. In addition, the implant extractor is capable of gripping a wide range of sizes of hip stem implant trunnions.
1. An implant extractor comprising:
a shaft body;
a telescoping push rod extending from the shaft body, the telescoping push rod including a proximal rod segment and a distal rod segment moveable relative to the proximal rod segment;
an adjustor engaged with the push rod for adjusting a length of the telescoping push rod;
a support arm extending laterally from the shaft body; and
a jaw assembly extending from the support arm, the jaw assembly including:
a jaw moveable between a locking position and an unlocking position, and
a rocker arm operatively engaged with the push rod and the jaw.
2. The implant extractor of claim 1 , further comprising a cam lock operatively engaged with the telescoping push rod.
3. The implant extractor of claim 2 , wherein the cam lock includes a cam housed within the shaft body, and a lever extending from the cam.
4. The implant extractor of claim 1 , wherein the telescoping push rod is housed within the shaft body.
5. The implant extractor of claim 4 , wherein a distal end of the telescoping push rod extends past a distal end of the shaft body.
6. The implant extractor of claim 1 , wherein the telescoping push rod is moveable relative to the shaft body.
7. The implant extractor of claim 1 , wherein the telescoping push rod includes a distal rod segment having a planar side.
8. The implant extractor of claim 1 , wherein the telescoping push rod includes a proximal rod segment having a rotation limiter.
9. The implant extractor of claim 1 , wherein the adjustor is positioned about a distal end of the shaft body.
10. The implant extractor of claim 1 , wherein the adjustor includes an adjustment knob engaged with the telescoping push rod.
11. The implant extractor of claim 1 , wherein the support arm extends from a distal end of the adjustor.
12. The implant extractor of claim 1 , wherein the support arm has a longitudinal axis that extends from a longitudinal axis of the shaft body at an angle of about 100 to 170 degrees.
13. The implant extractor of claim 1 , wherein the support arm has a length of about 10 to 400 mm.
14. The implant extractor of claim 1 , wherein the jaw extends from a distal end of the support arm.
15. The implant extractor of claim 1 , wherein the jaw is a sliding jaw.
16. The implant extractor of claim 1 , wherein the jaw assembly includes a central passageway having a longitudinal axis substantially parallel to a longitudinal axis of the support arm.
17. The implant extractor of claim 16 , further comprising a gripping insert configured to be received in the central passageway.
18. The implant extractor of claim 17 , wherein the gripping insert includes grip-enhancing structure.
19. The implant extractor of claim 17 , wherein the gripping insert is annular with a lateral opening for receiving the jaw.
20. The implant extractor of claim 1 , wherein the rocker arm is pivotably connected to the support arm.
21. The implant extractor of claim 1 , wherein the rocker arm has a rocker arm ratio of about 1.5:1 to 8:1.
22. The implant extractor of claim 1 , wherein the rocker arm has at least one arm of about 10 to 100 mm.
23. The implant extractor of claim 1 , further comprising a tool connector extending laterally from the shaft body in a direction substantially opposite from the direction the support arm is extending laterally from the shaft body.
24. An implant extractor comprising:
a shaft body;
a tool connecter extending laterally away from a proximal end of the shaft body;
a telescoping push rod mounted within and extending from the shaft body, the telescoping push rod including a proximal rod segment and a distal rod segment moveable relative to the proximal rod segment;
a cam lock mounted within the shaft body for engaging a proximal end of the telescoping push rod;
an adjustor mounted to a distal end of the shaft body, the adjustor including an adjustment knob engaged with the telescoping push rod for adjusting a length of the telescoping push rod;
a support arm mounted to a distal end of the adjustor and extending laterally away from the shaft body; and
a jaw assembly extending from a distal end of the support arm, the jaw assembly including:
a jaw moveable between a locking position and an unlocking position, and
a rocker arm mounted to the support arm and operatively engaged with the telescoping push rod and the jaw.