Bone distraction apparatus

• US 20060015118A1
• Filed: 07/19/2004
• Published: 01/19/2006
• Est. Priority Date: 07/19/2004
• Status: Active Grant

• Current Assignee: Synthes USA LLC (Johnson & Johnson)
• Original Assignee: Synthes USA LLC (Johnson & Johnson)
• Inventors: Richter, Jens, Noon, John
• Granted Patent: US 7,875,033 B2
• Time in Patent Office: Days
• US Class Current: 606/90
• CPC Class Codes: A61B 17/66 Alignment, compression or distraction mechanisms
• CPC Class Codes: A61B 17/666 for alveolar distraction

Abstract

A bone distractor, preferably an alveolar ridge distractor, having first and second bone plates sized and configured to engage opposing bone segments and an interconnecting mechanism operatively associated with the first and second bone plates such that rotation of an activation screw causes the second bone plate to move with respect to the first bone segment. The distractor may also a housing having a first housing member operatively associated with the first bone plate and a second housing member operatively associated with the second bone plate, the second housing member being pivotally coupled to the first housing member such that the orientation of the second bone plate may be varied with respect to the first bone plate. Moreover, the second housing member may include a releasable closure cap so that the second bone plate may be easily removed and/or replaced, the second bone plate being provided in varying shapes and sizes.

Claims

1. A distractor comprising:

a first bone plate having a top surface, a bottom surface, and a plurality of bores extending therethrough for receiving a plurality of bone screws;

a second bone plate having a top surface, a bottom surface, and a plurality of bores extending therethrough for receiving a plurality of bone screws, the second bone plate further including a threaded bore;

an activation screw sized and configured to engage the threaded bore; and

a housing including a first housing member and a second housing member, the first housing member being sized and configured to engage the first bone plate, the second housing member being sized and configured to receive at least a portion of the activation screw therein;

wherein the first housing member is pivotally coupled to the second housing member.

2. The distractor of claim 1, wherein the first and second bone plates are sized and configured to engage first and second bone segments so that rotation of the activation screw causes the second bone plate to move with respect to the first bone plate, and thus moves the second bone segment with respect to the first bone segment.

3. The distractor of claim 2, wherein the first bone plate comprises a generally rectangular central section and a plurality of elongated sections extending therefrom.

4. The distractor of claim 3, wherein the central section includes a notch and a slot, the notch and the slot being sized and configured to receive tabs formed on the first housing member.

5. The distractor of claim 1, wherein the first housing member includes a pair of arms for pivotally receiving a stem extending from the second housing member.

6. The distractor of claim 5, wherein each arm includes a circular aperture and the stem includes a circular bore for receiving a pin therethrough.

7. The distractor of claim 6, wherein the first housing member includes a compartment for housing a portion of the stem and a locking mechanism sized and configured to secure the relative position of the second housing member with respect to the first housing member.

8. The distractor of claim 1, further comprising a locking mechanism having an unlocked position wherein the second housing member is free to pivot with respect to the first housing member and a locked position wherein the orientation of the second housing member is fixed with respect to the first housing member.

9. The distractor of claim 8, wherein an end portion of the second housing member includes a plurality of teeth for engagement with a plurality of teeth formed on the locking mechanism so that the intermeshing of the teeth fixes the orientation of the second housing member with respect to the first housing member when the locking mechanism is moved to the locked position.

10. The distractor of claim 8, wherein the locking mechanism comprises a first member, a second member, and a locking screw, wherein rotation of the locking screw moves the locking mechanism from the unlocked position to the locked position thereby fixing the position of the second housing member with respect to the first housing member.

11. The distractor of claim 10, wherein the first and second members include tapered surfaces sized and configured such that rotation of the locking screw causes the second member to move upwards with respect to the first member, thus causing the first member to move laterally into engagement with the second housing member.

12. The distractor of claim 1, wherein the second housing member includes a longitudinal slot formed therein and the second bone plate includes a neck portion extending from the threaded bore, the slot being sized and configured to guide the neck portion.

13. The distractor of claim 1, wherein the second bone plate comprises first and second plate sections, wherein the first and second plate sections are provided in a closely spaced apart configuration and whereafter the first and second plate sections are capable of being separated to conform to the targeted bone segment.

14. The distractor of claim 13, wherein the first and second plate sections are initially separated by an angle of less than 90°

.

15. The distractor of claim 13, wherein the first and second plate sections are initially separated by an angle of approximately 15°

.

16. The distractor of claim 1, wherein the second housing member comprises an elongated body and a releaseably engaged closure cap.

17. The distractor of claim 16, wherein the elongated body has a rib formed on an outer surface thereof, the rib being sized and configured to engage a groove formed on an inner surface of the closure cap.

18. The distractor of claim 17, wherein the cap includes at least one slot for enabling the cap to flex.

19. The distractor of claim 1, further comprising a vector control device operatively associated with the first and second housing members, the vector control device being sized and configured to pivot the second housing member with respect to the first housing member.

20. The distractor of claim 19, wherein the vector control device comprises a vector control screw and a linkage, wherein rotation of the control screw moves the linkage and thus the second housing member with respect to the first housing member.

21. A distractor comprising:

a first bone plate having a top surface, a bottom surface, and a plurality of bores extending therethrough for receiving a plurality of bone screws;

a second bone plate having a top surface, a bottom surface, and a plurality of bores extending therethrough for receiving a plurality of bone screws, the second bone plate further including a threaded bore; and

an activation screw sized and configured to engage the threaded bore; and

a housing operatively associated with the first and second bone plates;

wherein the second bone plate includes a pair of deflectable bone plate sections, the bone plate sections projecting from the threaded bore in a closely spaced apart configuration and whereafter the first and second plate sections are capable of being separated to conform to the targeted bone segment.

22. The distractor of claim 21, wherein the first and second plate sections are initially separated by an angle of less than 90°

.

23. The distractor of claim 21, wherein the first and second plate sections are initially separated by an angle of approximately 15°

.

24. The distractor of claim 21, wherein the housing includes a first housing member and a second housing member, the first housing member being sized and configured to engage the first bone plate, the second housing member being sized and configured to receive at least a portion of the activation screw therein;

wherein the first housing member is pivotally coupled to the housing member.

25. The distractor of claim 24, wherein the first and second bone plates are sized and configured to engage first and second bone segments so that rotation of the activation screw causes the second bone plate to move with respect to the first bone plate, and thus moves the second bone segment with respect to the first bone segment.

26. The distractor of claim 25, wherein the first bone plate comprises a generally rectangular central section and a plurality of elongated sections extending therefrom.

27. The distractor of claim 26, wherein the central section includes a notch and a slot, the notch and the slot being sized and configured to receive tabs formed on the first housing member.

28. The distractor of claim 24, wherein the first housing member includes a pair of arms for pivotally receiving a stem extending from the second housing member.

29. The distractor of claim 28, wherein each arm includes a circular aperture and the stem includes a circular bore for receiving a pin therethrough.

30. The distractor of claim 29, wherein the first housing member includes a compartment for housing a portion of the stem and a locking mechanism sized and configured to secure the relative position of the second housing member with respect to the first housing member.

31. The distractor of claim 24, further comprising a locking mechanism having an unlocked position wherein the second housing member is free to pivot with respect to the first housing member and a locked position wherein the orientation of the second housing member is fixed with respect to the first housing member.

32. The distractor of claim 31, wherein an end portion of the second housing member includes a plurality of teeth for engagement with a plurality of teeth formed on the locking mechanism so that the intermeshing of the teeth fixes the orientation of the second housing member with respect to the first housing member when the locking mechanism is moved to the locked position.

33. The distractor of claim 32, wherein the locking mechanism comprises a first member, a second member, and a locking screw, wherein rotation of the locking screw moves the locking mechanism from the unlocked position to the locked position thereby fixing the position of the second housing member with respect to the first housing member.

34. The distractor of claim 33, wherein the first and second members include tapered surfaces sized and configured such that rotation of the locking screw causes the second member to move upwards with respect to the first member, thus causing the first member to move laterally into engagement with the second housing member.

35. The distractor of claim 21, wherein the housing includes a longitudinal slot formed therein and the second bone plate includes a neck portion extending from the threaded bore, the slot being sized and configured to guide the neck portion.

36. The distractor of claim 24, wherein the second housing member comprises an elongated body and a releaseably engaged closure cap.

37. The distractor of claim 36, wherein the elongated body has a rib formed on an outer surface thereof, the rib being sized and configured to engage a groove formed on an inner surface of the closure cap.

38. The distractor of claim 37, wherein the cap includes at least one slot for enabling the cap to flex.

39. The distractor of claim 24, further comprising a vector control device operatively associated with the first and second housing members, the vector control device being sized and configured to pivot the second housing member with respect to the first housing member.

40. The distractor of claim 39, wherein the vector control device comprises a vector control screw and a linkage, wherein rotation of the control screw moves the linkage and thus the second housing member with respect to the first housing member.

41. A kit comprising:

a bone distractor including;

a first bone plate having a top surface, a bottom surface, and a plurality of bores extending therethrough for receiving a plurality of bone screws;

a removeably coupled second bone plate having a top surface, a bottom surface, and a plurality of bores extending therethrough for receiving a plurality of bone screws, the second bone plate further including a threaded bore;

an activation screw sized and configured to engage the threaded bore; and

a housing including a first housing member and a second housing member, the first housing member being sized and configured to engage the first bone plate, the second housing member being sized and configured to receive at least a portion of the activation screw therein;

wherein the first housing member is pivotally coupled to the housing member;

wherein the kit further includes a variety of second bone plates, the second bone plate being provided in a variety of different shapes and sizes.

42. The kit of claim 41, wherein the kit includes at least one second bone plate having first and second plate sections, the first and second plate sections being provided in a closely spaced apart configuration and whereafter the first and second plate sections are capable of being separated to conform to the targeted bone segment.

43. The kit of claim 41, wherein the kit further includes a variety of activation screws being provided in a variety of different lengths.

44. The kit of claim 41, wherein the kit further includes a variety of activation screws being provided with a variety of different screw threads.

45. The kit of claim 41, wherein the kit further includes a variety of end caps for releasably engaging the second housing member.

46. The kit of claim 41, wherein the kit includes a variety of first bone plates in a variety of different shape and sizes.