External bone fixation system
An external fixation assembly for bone fusion or separation is disclosed. The assembly includes a fracture fusion tube, with a bracket slidably engaged thereon. The assembly further includes a collet clamp connected to the bracket, with a ball collet rotatably seated within the clamp, the ball collet having an aperture for receiving a bone bin therethrough and perforations for a compression engagement with a bone pin. The assembly uses a single screw for threadably engaging the ball collet, the clamp and the bracket such that the position of the bone pin, ball collet and bracket are all fixed.
1. A method for using an external bone fixation system, the method comprising:
sliding a bracket along a fracture fusion tube via a bracket throughbore, wherein the bracket includes a threaded bracket support aperture;
rotating a pin collet clamp relative to the bracket, the pin collet clamp including a threaded clamp support aperture and a clamp throughbore;
inserting a bone pin through a ball collet aperture of a monolithic ball collet rotatably disposed within the clamp throughbore;
substantially rotating the monolithic ball collet with the bone pin inserted therein in multiple planes within the clamp throughbore to allow a direction of the ball collet aperture to be independently adjusted in the multiple planes; and
tightening a single screw to simultaneously:
affix the bracket over the fracture fusion tube,
affix the bracket and the pin collet clamp, and
compress the clamp throughbore, thus preventing the monolithic ball collet from rotating within the clamp throughbore and tightening the ball collet aperture over the bone pin.
2. The method of claim 1 , wherein the fracture fusion tube further comprises at least two detents.
3. The method of claim 1 , wherein the pin collet clamp further comprises a sleeve disposed in the clamp throughbore of the pin collet clamp, wherein the monolithic ball collet is disposed in the sleeve.
4. The method of claim 3 , wherein the sleeve is made of plastic, and wherein the bracket, the pin collet clamp and the single screw are made of metal.
5. The method of claim 4 , wherein the monolithic ball collet is made of metal.
6. The method of claim 1 , wherein the pin collet clamp comprises a first surface feature on a side of the pin collet clamp, and wherein the bracket comprises a second surface feature on a side of the bracket, wherein the first surface feature and the second surface feature are configured to mate with one another when the side of the pin collet clamp and the side of the bracket are brought together by tightening the single screw.
7. The method of claim 1 , wherein the monolithic ball collet comprises:
a first pair of cuts extending from a first opening of the ball collet aperture over an outer surface of the ball collet toward a second opening of the ball collet aperture; and
a second pair of cuts extending from the second opening of the ball collet aperture over the outer surface of the ball collet toward the first opening of the ball collet aperture,
wherein each of the first pair of cuts and the second pair of cuts extends along approximately 90 percent of a length of the outer surface.
8. The method of claim 1 , further comprising providing multiple bone pins.
9. A method for using an external bone fixation system, the method comprising:
sliding a bracket along a fracture fusion tube via a bracket throughbore, wherein the bracket includes a threaded bracket support aperture;
rotating a monolithic pin collet clamp relative to the bracket, the pin collet clamp including a threaded clamp support aperture and a clamp throughbore;
inserting a bone pin through a ball collet aperture of a monolithic ball collet rotatably disposed within the clamp throughbore;
rotating the monolithic ball collet in multiple planes within the clamp throughbore to allow a direction of the ball collet aperture to be independently adjusted in the multiple planes; and
tightening a single screw to simultaneously:
affix the bracket over the fracture fusion tube,
affix the bracket and the pin collet clamp, and
compress the clamp throughbore, thus preventing the monolithic ball collet from rotating
within the clamp throughbore and tightening the ball collet aperture over the bone pin.
10. The method of claim 9 , wherein the fracture fusion tube further comprises at least two detents.
11. The method of claim 9 , wherein the pin collet clamp further comprises a sleeve disposed in the clamp throughbore of the pin collet clamp, wherein the monolithic ball collet is disposed in the sleeve.
12. The method of claim 9 , wherein the pin collet clamp comprises a first surface feature on a side of the pin collet clamp, and wherein the bracket comprises a second surface feature on a side of the bracket, wherein the first surface feature and the second surface feature are configured to mate with one another when the side of the pin collet clamp and the side of the bracket are brought together by tightening the single screw.
13. The method of claim 9 , wherein the monolithic ball collet comprises:
a first pair of cuts extending from a first opening of the ball collet aperture over an outer surface of the monolithic ball collet toward a second opening of the ball collet aperture; and
a second pair of cuts extending from the second opening of the ball collet aperture over the outer surface of the monolithic ball collet toward the first opening of the ball collet aperture,
wherein each of the first pair of cuts and the second pair of cuts extends along approximately 90 percent of a length of the outer surface.
14. A method for using an external bone fixation system, the method comprising:
sliding a bracket along a fracture fusion tube via a bracket throughbore, wherein the
bracket includes a threaded bracket support aperture;
rotating a U-shaped pin collet clamp relative to the bracket, the pin collet clamp including a threaded clamp support aperture and a clamp throughbore;
inserting a bone pin through a ball collet aperture of a monolithic ball collet rotatably disposed within the clamp throughbore;
rotating the monolithic ball collet in multiple planes within the clamp throughbore to allow a direction of the ball collet aperture to be independently adjusted in the multiple planes; and
tightening a single screw to simultaneously:
affix the bracket over the fracture fusion tube,
affix the bracket and the pin collet clamp, and
squeeze the pin collet clamp so as to compress the clamp throughbore, thus preventing the monolithic ball collet from rotating within the clamp throughbore and tightening the ball collet aperture over the bone pin.
15. The method of claim 14 , wherein the fracture fusion tube further comprises at least two detents.
16. The method of claim 14 , wherein the pin collet clamp further comprises a sleeve disposed in the clamp throughbore of the pin collet clamp, wherein the monolithic ball collet is disposed in the sleeve.
17. The method of claim 14 , wherein the pin collet clamp comprises a first surface feature on a side of the pin collet clamp, and wherein the bracket comprises a second surface feature on a side of the bracket, wherein the first surface feature and the second surface feature are configured to mate with one another when the side of the pin collet clamp and the side of the bracket are brought together by tightening the single screw.
18. The method of claim 14 , wherein the monolithic ball collet comprises:
a first pair of cuts extending from a first opening of the ball collet aperture over an outer surface of the monolithic ball collet toward a second opening of the ball collet aperture; and
a second pair of cuts extending from the second opening of the ball collet aperture over the outer surface of the monolithic ball collet toward the first opening of the ball collet aperture,
wherein each of the first pair of cuts and the second pair of cuts extends along approximately 90 percent of a length of the outer surface.