Bone screw system and method
First Claim
1. A fracture compressive system comprising:
- a sleeve comprising a proximal sleeve portion and a distal sleeve portion, wherein the sleeve is configured to contact a first bone portion, wherein the sleeve includes a surface which forms a ridge on the inside surface of the sleeve;
a stop cap;
a shaft comprising a distal shaft portion, a proximal shaft portion, and a body portion, wherein an exterior of the distal shaft portion is configured to anchor into a second bone portion, wherein the proximal shaft portion of the shaft is received within the sleeve such that shaft and sleeve move longitudinally relative to one another,wherein the stop cap attaches to the proximal shaft,wherein the shaft includes a flat surface such that the ridge impacts a distal portion of the stop cap to limit the outward longitudinal movement of the shaft and the ridge impacts a distal portion of the flat surface to limit the inward longitudinal movement of the shaft; and
a compressive device engaged between the sleeve and the shaft, wherein the proximal end of the sleeve comprises a recessed region comprising a ledge, wherein the compression device has one end abutting the ledge, and wherein the compressive device is configured to shorten in direct relationship with collapse of the shaft relative to the sleeve, and wherein the shaft, the sleeve and the compressive device cannot move rotationally relative to one another.
4 Assignments
0 Petitions
Accused Products
Abstract
An improved bone screw is disclosed which includes a shaft with distal portion having a threaded surface thereon, a sleeve having an opening which receives the shaft such that the shaft is able to move within the sleeve without moving the sleeve. A compressive device may be incorporated between the sleeve and the proximal portion of the shaft such that the compressive device forces the shaft and sleeve towards at least a portion each other, thereby maintaining the compressive load at the union of the fracture. As additional compression is exerted on the load from weight bearing, the force may be reduced, but the head of the sleeve is still substantially maintained against the lateral cortex.
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Citations
11 Claims
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1. A fracture compressive system comprising:
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a sleeve comprising a proximal sleeve portion and a distal sleeve portion, wherein the sleeve is configured to contact a first bone portion, wherein the sleeve includes a surface which forms a ridge on the inside surface of the sleeve; a stop cap; a shaft comprising a distal shaft portion, a proximal shaft portion, and a body portion, wherein an exterior of the distal shaft portion is configured to anchor into a second bone portion, wherein the proximal shaft portion of the shaft is received within the sleeve such that shaft and sleeve move longitudinally relative to one another, wherein the stop cap attaches to the proximal shaft, wherein the shaft includes a flat surface such that the ridge impacts a distal portion of the stop cap to limit the outward longitudinal movement of the shaft and the ridge impacts a distal portion of the flat surface to limit the inward longitudinal movement of the shaft; and a compressive device engaged between the sleeve and the shaft, wherein the proximal end of the sleeve comprises a recessed region comprising a ledge, wherein the compression device has one end abutting the ledge, and wherein the compressive device is configured to shorten in direct relationship with collapse of the shaft relative to the sleeve, and wherein the shaft, the sleeve and the compressive device cannot move rotationally relative to one another. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification