Sacroiliac implant
OwnerMichael R. Mooreinventor
Life of this patent
Estimating the term…
Abstract
An implant is provided which facilitates enhanced structural stability across a joint to be immobilized. The sacroiliac implant is an elongate structure having two cylindrical sections of differing diameters. The implant further has like-handed, but dissimilar pitched threaded sections at the proximal and distal ends thereof to produce compressive forces across the joint. A hollow core traverses the length of the implant. A plurality of apertures or openings are formed through the implant transversely to the longitudinal axis and communicate with the hollow core. Bone graft or a BMP-soaked carrier fill the hollow core. The openings or apertures provide a conductive path of healing for bony ingrowth. The proximal end of the implant provides for engagement with a tool to drive the implant.
Claims19
An implant for immobilizing a joint between opposing bone structures, said implant comprising:
- a cylindrical proximal section having, a first outer diameter, and a first uniform helical thread having a first pitch;
- a cylindrical distal section having a second smaller outer diameter and a second uniform helical thread having a second pitch which is greater than said first pitch;
- an intermediate section interconnecting said proximal section and said distal section;
- said proximal, distal and intermediate sections having a contiguous interior surface defining a hollow core;
- at least one of said proximal and distal sections having a plurality of openings extending radially from and in communication with said hollow core and aligned transversely to a longitudinal axis of said implant;
- and
- means on said proximal section for accommodating a tool to drive said implant.
An implant for immobilizing a joint between opposing bone structures, said implant comprising:
- a body extending along a longitudinal axis and having proximal and distal sections, an intermediate section interconnecting said proximal and distal sections, a hollow core formed along said longitudinal axis, and a plurality of openings formed through said body in communication with said hollow core and extending transversely to said longitudinal axis;
- a first set of threads formed on said proximal section having a first uniform pitch and a thread crest defining a first larger diameter;
- and
- a second set of threads formed on said distal section having a second greater uniform pitch, and a thread crest de fining a second smaller diameter.
An implant for immobilizing a joint between opposing bone structures, said implant comprising:
- means for producing compression between the opposing bone structures across the joint, said means for producing compression comprising dissimilarly pitched, externally threaded sections of said implant;
- means for allowing bony ingrowth to occur through said implant to help fuse said bone structures, said means for allowing formed integrally with said means for producing compression;
- a bone producing material placed inside a hollow core of said implant, and said material being selected from the group consisting of a bone graft or a bone morphogenic substance;
- and
- means on said implant for accommodating a tool to drive said implant.
Dependencies are inferred from the claim text.