Bone screw threaded plug closure with central set screw
OwnerRoger P. Jacksoninventor
Life of this patent
Estimating the term…
Abstract
A threaded plug closure for an open-ended bone screw has a center bore and is threaded to receive a set screw. The set screw includes a breakaway head and a base which is slotted to permit removal following installation. The base includes an axial point and circumferential ring which engage the center portion of an associated spinal rod. The plug closure and the set screw can be independently installed and the set screw tightened to cooperatively provide capture and locking of the rod or connector in order to secure the rod or connector against translational and rotational movement relative to the bone screw.
Claims9
A plug closure adapted for use in securing a rod member to a bone screw implant;
- said closure comprising:
- a) a plug having an axis of rotation and a threaded cylindrical shaped outer surface;
- b) a central bore axially located in and passing entirely through said plug;
- and
- c) said central bore having an internal threaded surface spaced from said outer surface and sized and shaped to receive a set screw.
A medical implant comprising:
- a) an open bone screw having a threaded shaft adapted to be received in a bone of a patient and an open head with a pair of branches forming a rod receiving yoke therebetween;
- each of said branches being threaded on facing surfaces thereof;
- b) a closure plug having a body with an axis of rotation and an outer threaded surface;
- the threads on each of said branch threaded surfaces and said closure plug being mateable to allow said closure plug to the threadably received between said branches during use;
- said closure plug also having a central threaded bore coaxially located with respect to the axis of rotation of and passing entirely through said plug;
- and
- c) a set screw having an outer threaded surface that is threadably received in said bore during use so as to be adapted to operably secure a member between said yoke and said plug closure.
A medical implant apparatus, comprising:
- a) a first implant having a rod member receiving surface and a threaded aperture above said surface;
- b) a plug closure having a threaded outer surface and a central bore passing entirely through said closure;
- c) said closure outer surface being matingly receivable in said first implant second threaded aperture;
- d) a set screw having a threaded outer set screw surface and being threadably receivable in said closure central threaded bore;
- and
- e) said set screw having a base including said threaded set screw surface and having a bottom with a coaxial tip positioned to operably engage a rod member during usage.
Dependencies are inferred from the claim text.