A bone fixation element includes a threaded head and a shaft extending along a longitudinal axis from a proximal end to a distal end, an outer surface of the head being one of carburized and nitrided and including a first groove extending into an outer surface of the head along a path interrupting t
A bone fixation element includes a threaded head and a shaft extending along a longitudinal axis from a proximal end to a distal end, an outer surface of the head being one of carburized and nitrided and including a first groove extending into an outer surface of the head along a path interrupting the threading and extending along an angle counter to an angle of the threading.
대표청구항▼
1. A system for bone fixation, comprising: an elongated bone implant having a shaft configured for insertion into a bone in an operative configuration and being formed of a ferrite-free implant grade material, an outer surface of the bone implant being one of carburized and nitrided to have a first
1. A system for bone fixation, comprising: an elongated bone implant having a shaft configured for insertion into a bone in an operative configuration and being formed of a ferrite-free implant grade material, an outer surface of the bone implant being one of carburized and nitrided to have a first hardness and to increase a corrosion resistance; anda bone fixation plate having an opening extending therethrough from a first surface configured to contact the bone in an operative configuration to a second surface located opposite the first surface, the opening being configured to receive the bone implant therethrough, the bone fixation plate having a second hardness;wherein the first hardness is greater than the second hardness. 2. The system of claim 1, wherein the bone implant is a bone screw having a threaded head. 3. The system of claim 1, wherein a head of the bone implant includes a rounded outer profile. 4. The system of claim 1, wherein a head of the implant includes a substantially spherical outer profile. 5. The system of claim 1, wherein the opening is a variable angle hole. 6. The system of claim 1, wherein the first hardness in the range of 67-74 HRC and the second hardness is in the range of 74 HRB-44 HRC. 7. The system of claim 1, wherein the bone implant is formed of one of an implant quality austensitic stainless steel, cobalt alloys, MP35N, L605, ASTM-F-1058,Elgiloy, Titanium, and titanium alloys. 8. The system of claim 7, wherein the bone implant is formed of one of Biodur 108 and 316L stainless steel. 9. A bone fixation element comprising a threaded head and a shaft extending along a longitudinal axis from a proximal end to a distal end and formed of a ferrite-free implant grade material, an outer surface of the head being one of carburized and nitrided to increase a surface hardness thereof and including a first groove extending into the outer surface of the head along a path interrupting the threading and extending along an angle counter to an angle of the threading. 10. The bone fixation element of claim 9, wherein a material of the bone fixation element is selected to be harder than a material of a bone plate through which the bone fixation element is to be inserted. 11. The bone fixation element of claim 9, wherein the first groove extends along a groove axis perpendicular to the longitudinal axis of the bone fixation element. 12. The bone fixation element of claim 9, further comprising a notch formed adjacent the distal end of the shaft. 13. The bone fixation element of claim 9, further comprising a recess in a proximal end of the bone fixation element, the recess configured to engage a driving mechanism. 14. The bone fixation element of claim 9, wherein the head comprises one of five grooves and eight grooves. 15. The bone fixation element of claim 9, wherein the shaft is threaded. 16. The bone fixation element of claim 15, wherein a pitch of threads of the shaft is the same as a pitch of threads of the head. 17. The bone fixation element of claim 15, wherein the thread of the shaft includes multiple leads. 18. The bone fixation device of claim 9, wherein the head is substantially spherical. 19. A bone fixation system, comprising: a bone fixation element comprising a threaded head and a shaft extending along a longitudinal axis from a proximal end to a distal end and being formed of a ferrite-free implant garde material, an outer surface of the head being one of carburized and nitrided to increase a surface hardness thereof and including a first groove extending into the outer surface of the head along a path interrupting the threading and extending along an angle counter to an angle of the threading; andan elongated bone plate extending along a plate axis and having a plate hole extending therethrough from a first surface to a second surface configured to contact a bone in an operative configuration. 20. The bone fixation system of claim 19, wherein a material of the bone fixation element is selected to be harder than a material of the bone plate through which the bone fixation element is to be inserted. 21. The bone fixation system of claim 19, wherein the first groove extends along a groove axis perpendicular to the longitudinal axis of the bone fixation element. 22. The bone fixation system of claim 19, wherein the plate hole is one of a combination hole and a variable angle hole. 23. The bone fixation system of claim 19, wherein the second surface of the bone plate comprises a plurality of undercuts. 24. The bone fixation system of claim 19, wherein the plate hole comprises a first tapered portion adjacent the first surface, a second tapered portion adjacent the second surface and a threaded portion extending between the first and second tapered portions. 25. The bone fixation system of claim 19, further comprising a notch adjacent the distal end of the bone screw. 26. The bone fixation system of claim 19, further comprising a recess in a proximal end of the bone screw, the recess configured to engage a driving mechanism. 27. The bone fixation system of claim 19, wherein the shaft is threaded. 28. The bone fixation system of claim 19, wherein a pitch of threads of the shaft is the same as a pitch of threads of the head. 29. The bone fixation system of claim 19, wherein the plate hole is a variable angle hole including a slot extending along a wall of the hole and configured to interrupt threads thereof. 30. A method for treating a bone, comprising: placing a bone fixation device over a target bone, the bone fixation device extending along a plate axis and having a hole extending therethrough from a first surface to a second surface configured to contact the bone in an operative configuration; andinserting a bone fixation element through the hole and into the bone, the bone fixation element comprising a threaded head and a shaft extending along a longitudinal axis from a proximal end to a distal end and being formed of a ferrite-free implant grade material, an outer surface of the head being one of carburized and nitrided to increase a surface hardness thereof and including a first groove extending into the outer surface of the head along a path interrupting the threading and extending along an angle counter to an angle of the threading.
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이 특허에 인용된 특허 (14)
Frigg Robert,CHX ; Schavan Robert,CHX ; Hehli Markus,CHX, Bone plate.
Orbay, Jorge L.; Castaneda, Javier E.; Castaneda, Alfredo; Mebarak, Edward, Bone stabilization system including plate having fixed-angle holes together with unidirectional locking screws and surgeon-directed locking screws.
Grady, Jr., Mark P.; Haag, René; Didomenico, Scott; Koay, Kenny; Mast, Jeffrey W.; Bolhofner, Brett R.; Mayo, Keith A., Methods for implanting bone plates.
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