Dip fusion spike screw
First Claim
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1. A bone fusion screw comprising:
- (a) a first threaded portion having a uniform first diameter, first threads having a first thread pitch and a uniform first thread height, and a driver head; and
(b) a second threaded portion with second threads having a second thread pitch and a second thread height, wherein the second threaded portion tapers from a second diameter to a smaller, third, diameter, wherein the second thread pitch is greater than the first thread pitch and the second thread height is greater than the first thread height; and
(c) a central portion between the first threaded portion and the second threaded portion, wherein the central portion has a uniform diameter.
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Abstract
Devices and methods are disclosed for the fusion of joints (particularly finger joints or toe joints) in a bent (or angled) position. The device is not cannulated, straight and inserted into the joint in its straight configuration. The device is configured to have a thicker portion at its proximal end than at its distal end. The device is preferably inserted into a finger joint that is already bent at an angle, and the thin, distal end is configured to screw into and attach to the bone of second joint thereby fusing the first joint to the second joint.
148 Citations
23 Claims
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1. A bone fusion screw comprising:
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(a) a first threaded portion having a uniform first diameter, first threads having a first thread pitch and a uniform first thread height, and a driver head; and (b) a second threaded portion with second threads having a second thread pitch and a second thread height, wherein the second threaded portion tapers from a second diameter to a smaller, third, diameter, wherein the second thread pitch is greater than the first thread pitch and the second thread height is greater than the first thread height; and (c) a central portion between the first threaded portion and the second threaded portion, wherein the central portion has a uniform diameter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification