Polyaxial bone screw locking mechanism
First Claim
Patent Images
1. A swivel head bone screw for surgical implantation comprising:
- a) a head having structure associated therewith for receiving a rod member;
said head having a body;
b) a shank having a lower threaded portion adapted for implantation into bone and an upper portion operably received within said head;
said shank being swivelable about said upper portion relative to said head during certain stages of implantation so as to allow rotational movement therebetween to a selected configuration;
c) said head body having a threaded aperture passing through a side thereof so as to be generally aligned with said shank upper portion when said shank upper portion is received in said head; and
d) a set screw operably received in said aperture so as to directly abut against said shank upper portion and lock said shank and head in said selected configuration.
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Abstract
A bone screw having a head and a shank. The shank having a ball thereon and the head having a socket for receiving the ball. The ball being externally threaded and the chamber communicating with the exterior of the head through a threaded bore. The ball being threadably received through the bore and being swivelable in the chamber after passing through the bore. The bone screw including at least one set screw that operably engages the ball to lock the head in position relative to the shank.
303 Citations
5 Claims
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1. A swivel head bone screw for surgical implantation comprising:
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a) a head having structure associated therewith for receiving a rod member;
said head having a body;b) a shank having a lower threaded portion adapted for implantation into bone and an upper portion operably received within said head;
said shank being swivelable about said upper portion relative to said head during certain stages of implantation so as to allow rotational movement therebetween to a selected configuration;c) said head body having a threaded aperture passing through a side thereof so as to be generally aligned with said shank upper portion when said shank upper portion is received in said head; and d) a set screw operably received in said aperture so as to directly abut against said shank upper portion and lock said shank and head in said selected configuration. - View Dependent Claims (2, 3, 4)
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5. In a swivel head bone screw having a shank with an upper portion that is received in a head of the screw and that is rotatable in said head to a selected configuration;
- the improvement comprising;
a) said head having a threaded aperture through a body of the head; and b) a set screw operably positioned in said aperture and advanceable against said shank upper portion to lock said shank upper portion is said selected configuration relative to said head.
- the improvement comprising;
Specification