Interbody fusion device and components

Abstract

This invention provides an interbody fusion device comprising a body, a first positioning unit, and two second positioning units. The front end of the body has a first oblique arc surface, a second oblique arc surface, and an arc surface. Each side of the body has a first rack and a second rack disposed opposite to each other. The first rack has a plurality of first teeth, and the second rack has a plurality of second teeth, which are staggered. The rear end of the body has a convex tooth on its top surface, the crown of which is lower than the crown of the first tooth. The first positioning unit is disposed at the front end, and the second positioning units are disposed at each side or at the junction of each side and the rear end. This invention also provides an interbody fusion component. These methods achieve the effects of reducing implantation resistance, preventing dislocation, increasing structural strength, and improving implantation accuracy.

Claims

1. An interbody fusion device, comprising: a body having a front end, two side sides and a rear end, the front end, the two side sides and the rear end forming a penetrating space, the front end having a first oblique arc surface, a second oblique arc surface and an arc surface connecting the first oblique arc surface and the second oblique arc surface, the distance between the first oblique arc surface and the second oblique arc surface gradually decreasing in the direction of the arc surface, each side side having a first rack and a second rack disposed opposite to each other, the first rack having a plurality of first teeth and the second rack having a plurality of second teeth, the first teeth and the second teeth being staggered, the rear end having a rear top surface, a rear bottom surface and a rear side surface connecting the rear top surface and the rear bottom surface, the rear top surface having a protruding tooth, the crown of the protruding tooth being lower than the crown of the first tooth and higher than the rear top surface; A first positioning unit is disposed at the front end; and two second positioning units are respectively disposed at each of the side portions or at the junction of each of the side portions and the rear end portion.

2. The interbody fusion device as claimed in claim 1, wherein the slope of the first oblique arc surface is greater than the slope of the second oblique arc surface.

3. The interbody fusion device as claimed in claim 1, wherein the first oblique arc surface is divided into an anterior oblique arc surface and a posterior oblique arc surface, the distance between the anterior oblique arc surface and each of the side portions is greater than the distance between the posterior oblique arc surface and each of the side portions, and the slope of the anterior oblique arc surface is greater than the slope of the posterior oblique arc surface.

4. The interbody fusion device as claimed in claim 1, wherein each of the first racks and each of the second racks are ratchet racks with their tooth profiles directed from the front end toward the rear end.

5. The interbody fusion device as claimed in claim 1, wherein each of the first racks is inclined toward the first oblique arc surface.

6. The interbody fusion device as claimed in claim 1, wherein the crowns of each of the first teeth are positioned between each of the second teeth.

7. The interbody fusion device as claimed in claim 1, wherein the first positioning unit is inserted into the anterior end portion from the apex of the arc surface toward the posterolateral side.

8. The interbody fusion device as claimed in claim 1, wherein each of the second positioning units is disposed through the first rack toward the second rack at the junction of the side portion and the rear portion, or through the junction of the first rack and the rear top surface toward the junction of the second rack and the rear bottom surface at the junction of the side portion and the rear portion.

9. The interbody fusion device as claimed in claim 1, wherein one or both ends of each of the second positioning units has a protruding tip that is higher than each of the first tooth or each of the second teeth.

10. The interbody fusion device as claimed in claim 1 further includes a third positioning unit disposed at the posterior end.

11. An interbody fusion assembly comprising: an interbody fusion device as claimed in claim 1, wherein the posterior side has a threaded hole, a first hole, and a second hole extending through the posterior end, wherein the first hole has a different shape from the second hole; an inserter having a connecting portion on one side and a gripping portion on the other side, the connecting portion having a screw, a first rod, and a second rod, the screw, the first rod, and the second rod respectively corresponding to the threaded hole, the first hole, and the second hole.

12. The interbody fusion assembly as claimed in claim 11, wherein the first hole is a circular hole and the second hole is an elongated hole.

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