IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0958743
(2004-10-05)
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등록번호 |
US-8540753
(2013-09-24)
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발명자
/ 주소 |
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출원인 / 주소 |
|
대리인 / 주소 |
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인용정보 |
피인용 횟수 :
0 인용 특허 :
213 |
초록
▼
A polyaxial bone screw assembly includes a threaded shank body integral with an upper capture structure and a head having an inner cavity for receiving the capture structure. The capture structure is threaded and the head includes a threaded opening for rotatable assembly with the capture structure
A polyaxial bone screw assembly includes a threaded shank body integral with an upper capture structure and a head having an inner cavity for receiving the capture structure. The capture structure is threaded and the head includes a threaded opening for rotatable assembly with the capture structure and eventual locking frictional engagement between the capture structure and the head.
대표청구항
▼
1. A polyaxial bone screw assembly for implantation in a human comprising: a) an elongate shank having a body for fixation to a bone and a capture structure extending from the body, the capture structure having a first helically wound guide and advancement structure; andb) a head having an upper ope
1. A polyaxial bone screw assembly for implantation in a human comprising: a) an elongate shank having a body for fixation to a bone and a capture structure extending from the body, the capture structure having a first helically wound guide and advancement structure; andb) a head having an upper opening and a base with an inner surface defining a base cavity and a lower opening communicating with cavity having a second helically wound guide and advancement structure sized and shaped to rotatingly mate with the first guide and advancement structure, the capture structure being disposed and captured in the cavity upon operable mating and rotation of the first guide and advancement structure with the second guide and advancement structure until the first guide and advancement structure becomes disengaged from the second guide and advancement structure, the capture structure having a first orientation wherein the capture structure is disposed in the cavity and the shank body is swivelable relative to the head, and a second orientation, wherein the capture structure is in a non-threadedly mated frictional engagement with the second guide and advancement structure so that the shank cannot swivel relative to the head and wherein the shank capture structure can only be threadedly loaded into the cavity through the lower opening. 2. The assembly of claim 1 wherein the first and second guide and advancement structures are first and second threads. 3. The assembly of claim 2 wherein the first thread is an inverted buttress thread. 4. The assembly of claim 1 wherein a portion of the first guide and advancement structure frictionally engages with a portion of the second guide and advancement structure in said second orientation. 5. The assembly of claim 1 wherein the capture structure has a tool engagement formation disposed thereon adapted for non-slip engagement by a tool for driving the shank body into bone. 6. The assembly of claim 5 wherein the capture structure tool engagement formation is an upward axial projection having a hexagonal profile. 7. The assembly of claim 5 wherein the tool engagement formation is a projection and the capture structure has a tool seating surface, the projection and the tool seating surface partially defining a recess adapted for receiving a driving tool engaged with the tool engagement projection and wherein the driving tool is adapted to be in contact with the tool seating surface when driving the shank body into bone. 8. The assembly of claim 7 wherein the capture structure has at least one engagement wall disposed perpendicular to the tool seating surface and spaced from the projection, the engagement wall partially defining the recess for receiving the driving tool and wherein the driving tool is adapted to be in contact with the tool seating surface, the projection and the engagement wall when driving the shank body into bone. 9. The assembly of claim 1 wherein the shank is cannulated from the top to a bottom thereof. 10. The assembly of claim 1 further comprising a closure structure insertable into an upper opening of the head, the closure structure for indirectly operably urging the shank in a direction to frictionally lock the capture structure to the head in the second orientation thereof, thereby locking the shank body in a selected angle with respect to the head. 11. The assembly of claim 10 wherein the closure structure has a hexalobular internal driving feature. 12. The assembly of claim 10 wherein: (a) the head has upstanding spaced arms defining an open channel, the arms having a third guide and advancement structure on an inside surface thereof, the channel communicating with the cavity; and(b) the closure structure is sized and shaped to be positionable between the arms for closing the channel, the closure structure having a fourth guide and advancement structure for rotatably mating with the third guide and advancement structure, so as to be adapted to bias the closure structure upon advancement rotation against a rod disposed in the channel. 13. The assembly of claim 12 wherein the capture structure top has a dome sized and shaped to extend into the channel so as to be adapted to engage a rod received in the head and wherein the closure structure is adapted to operably urge the rod against the dome upon the closure structure being positioned in the head. 14. A polyaxial bone screw assembly for implantation in a human bone comprising: a) an elongate shank having a body for fixation in a bone and a capture structure extending from the body, the capture structure having a top and a radially outer surface with a first helically wound guide and advancement structure; andb) a head having a base and a top portion, the head top portion having an open channel, the base having a lower opening with a second helically wound guide and advancement structure therein that is sized and shaped to rotatingly mate with the first guide and advancement structure, the base further having a cavity openly joined to the opening, the channel communicating with the cavity, the cavity communicating with an exterior of the base through the opening, during assembly the capture structure being positionable in the cavity upon operable rotation of the first guide and advancement structure with the second guide and advancement structure until a disengagement between the first and second guide and advancement structures occurs such that the capture structure is substantially in the cavity and the shank body is exterior of the cavity whereby the shank capture structure can only be loaded into the head from below through the opening and thereafter locked in position relative to the head, the first and second guide and advancement structures configured for frictional engagement when the capture structure is urged toward the opening without rotation while the capture structure is within the head such that the shank body is locked in a fixed angular position with respect to the head. 15. The assembly of claim 14 wherein the first and second guide and advancement structures are first and second threads. 16. The assembly of claim 15 wherein the first thread is an inverted buttress thread. 17. The assembly of claim 14 wherein the capture structure has a lower substantially spherical surface, a portion of the spherical surface configured for frictional engagement with the second guide and advancement structure. 18. The assembly of claim 14 wherein the capture structure has a tool engagement formation disposed thereon adapted for non-slip engagement by a tool for driving the shank body into bone. 19. The assembly of claim 18 wherein the capture structure tool engagement formation is an axial projection having a hexagonal profile. 20. The assembly of claim 19 wherein the tool engagement formation is a projection and the capture structure has a tool seating surface, the projection and the tool seating surface partially defining a recess adapted for receiving a driving tool engaged with the tool engagement projection and wherein the driving tool is adapted to be in contact with the tool seating surface when driving the shank body into bone. 21. The assembly of claim 20 wherein the capture structure has at least one engagement wall disposed perpendicular to the tool seating surface and spaced from the projection, the engagement wall at least partially defining the recess for receiving the driving tool and wherein the driving tool is adapted to be in contact with the tool seating surface, the projection and the engagement wall when driving the shank body into bone. 22. The assembly of claim 14 wherein the shank is cannulated from the top to a bottom thereof. 23. The assembly of claim 14 further comprising a closure structure insertable into the head, the closure structure being adapted to operably urge the shank in a direction to frictionally lock the capture structure to the head, thereby locking the shank body in a selected angle with respect to the head. 24. The assembly of claim 23 wherein: (a) the head has upstanding spaced arms defining the open channel, the arms having a third guide and advancement structure on an inside surface thereof; and(b) the closure structure being sized and shaped to be positionable between the arms for closing the channel, the closure structure having a fourth guide and advancement structure for rotatably mating with the third guide and advancement structure. 25. The assembly of claim 24 wherein the capture structure top has a dome sized and shaped to extend into the channel so as to be adapted for engagement with a rod when received in the head and wherein the closure structure is adapted to operably urge the rod against the dome upon the closure structure being positioned in the head. 26. A polyaxial bone screw assembly for implantation into a human spine comprising: a) an elongate shank having a body for fixation to a bone and a capture structure extending from and integral with the body, the capture structure having a top, a radially outward facing surface with a first helically wound guide and advancement structure, and a tool engagement formation disposed adjacent the top, the tool engagement formation having a projection and a recessed tool seating surface having a bottom and an outer wall, both the bottom and outer wall sized and shaped for receiving and frictionally engaging a driving tool engaged with the tool engagement projection when driving the shank body into bone; andb) a head having a base with an inner surface defining a cavity, a portion of the inner surface having a second helically wound guide and advancement structure sized and shaped to rotatingly mate with the first guide and advancement structure, the base cavity communicating with an exterior of the base through an opening associated with the second guide and advancement structure such that the shank capture structure can only be upward loaded into the head through the lower opening in the head, the capture structure being pivotally disposed and captured in the cavity upon operable rotation of the first guide and advancement structure with the second guide and advancement structure until the first guide and advancement structure is disengaged from the second guide and advancement structure;(c) the head has upstanding spaced arms defining an open channel, the arms having a third guide and advancement structure on an inside surface thereof, the channel communicating with the cavity;(d) a closure structure insertable into an upper opening of the head, the closure structure being adapted for operably urging the shank in a direction to operably urge the shank capture structure against the head so as to frictionally lock the capture structure to the head, thereby locking the shank body in a selected angular position with respect to the head; and(e) the closure structure being sized and shaped to be positionable between the arms for closing the channel, the closure structure having a fourth guide and advancement structure for rotatably mating with the third guide and advancement structure. 27. The assembly of claim 26 wherein the capture structure top has a dome sized and shaped to extend into the channel when the capture structure is urged against the opening, the dome being adapted for engagement with a rod when received in the head and wherein the closure structure is adapted to operably urge the rod against the dome upon the closure structure being positioned in the head.
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