Upload shank swivel head bone screw spinal implant

a technology of spinal implants and shanks, which is applied in the field of polyaxial bone screws, can solve the problems of difficult or impossible to do, undesirable for implant pieces to be free to move around within the body, and achieve the effects of preventing further rotation, reducing the height of the screw head, and improving the mechanical

Inactive Publication Date: 2012-04-12
JACKSON ROGER P
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This design allows for easy positioning and secure locking of the rod, reduces the likelihood of screw disassembly, and maintains structural integrity by providing a low-profile, lightweight solution that resists unintentional disassembly, ensuring effective support and stability during and after surgery.

Problems solved by technology

This is sometimes very difficult or impossible to do so polyaxial bone screws are commonly used.
It is very undesirable for pieces of the implant to be free to move around within the body after surgery is completed and it also assures that the implant retains an ability to correct the structural problem for which it was implanted.

Method used

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  • Upload shank swivel head bone screw spinal implant
  • Upload shank swivel head bone screw spinal implant
  • Upload shank swivel head bone screw spinal implant

Examples

Experimental program
Comparison scheme
Effect test

second embodiment

[0061]Illustrated in FIG. 19 is a retainer ring 88 in accordance with the present invention. The retainer ring 88 is quite similar to the retainer ring 8 of the previous embodiment except that it is noncontinuous and has a radially extending space or gap 90 from top to bottom along one side thereof. The gap 90 allows for expansion without requiring stretching of the material of construction of the ring 88, as is the case with the previous embodiment. The ring 88 includes a central bore 92, spline channels 93 and spline receivers 94 which are all similar to the similar structures described for the previous embodiment. The retainer ring 88 also has a partial hemispherical shaped surface 95 on the outer side thereof.

[0062]Illustrated in FIGS. 20 and 21 are elements of a third embodiment of the present invention including a shank 106 and a capture ring 107 which are used otherwise in the same manner as has been described in the first embodiment and, in particular, with a head such as he...

first embodiment

[0063]The capture ring 107, shown in FIG. 21, is otherwise similar to the retainer ring 8 except that it includes a set of four channels 126 and four recesses 127 that are sized shaped and positioned so as with respect to the channels 126 to allow the splines 120 to slidingly pass upwardly through and with respect to the recesses 127 to capture and receive the splines 120, as they move axially downwardly. The ring 107 has a partial hemispherical outer surface 129 that mates with the corresponding surface in the head 7 in the manner described for the

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Abstract

A polyaxial bone screw having a bone implantable shank, a head and a retaining ring. The retaining ring includes an outer partial hemispherical surface and an inner bore. The shank mates and polyaxially rotates with the retaining ring inside the head. The head includes an internal cavity having a spherical shaped surface that mates with the ring surface and has a lower restrictive neck that prevents passage of the ring once the ring is seated in the cavity.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 10 / 818,555 filed Apr. 5, 2004, now U.S. Pat. No. ______, which was a continuation of Ser. No. 10 / 464,633, filed Jun. 18, 2003, now U.S. Pat. No. 6,716,214 and a continuation-in-part of Ser. No. 10 / 651,003, filed Aug. 28, 2003, now U.S. Pat. No. ______, all of the disclosures of which are incorporated by reference herein.BACKGROUND OF THE INVENTION[0002]The present invention is directed to a polyaxial bone screw for use in spinal surgery and the like and especially to such a screw adapted to receive a rod member and secure the rod member to a vertebra or the like.[0003]Many spinal surgery procedures require securing various implants to bone and especially to vertebrae along the spine. For example, elongate rods are often required that extend along the spine to provide support to vertebrae that have been damaged or weakened due to injury, disease or the like. Such rods m...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): A61B17/86B23P11/00A61B17/58A61B17/70
CPCA61B17/7032Y10T29/49826A61B17/7037
InventorJACKSON
OwnerJACKSON ROGER P