Fenestrated bone screw and method of injecting bone cement into bone structure
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
A61B-017/58
A61B-017/60
A61F-002/00
A61B-017/70
A61B-017/86
A61B-017/88
출원번호
US-0148270
(2014-01-06)
등록번호
US-9326801
(2016-05-03)
발명자
/ 주소
Poulos, Nicholas
출원인 / 주소
Poulos, Nicholas
대리인 / 주소
Polster, Lieder, Woodruff & Lucchesi LC
인용정보
피인용 횟수 :
1인용 특허 :
7
초록▼
A fenestrated bone screw and method of use is disclosed in which a bone cement injection tube may be readily and sealably connected to the head of the bone screw by means of a bayonet connector so that bone cement from a cement pump may be forced into a cannula of the bone screw and into the bone st
A fenestrated bone screw and method of use is disclosed in which a bone cement injection tube may be readily and sealably connected to the head of the bone screw by means of a bayonet connector so that bone cement from a cement pump may be forced into a cannula of the bone screw and into the bone structure proximate the fenestrations of the bone screw. Upon completion of the injection of the bone cement, the cement tube may be readily disconnected from the bone screw in such manner that leakage of bone cement is minimized. A surgical method of injecting bone cement into bone structure using such a cannulated, fenestrated bone screw is also disclosed.
대표청구항▼
1. A bone screw having a shank, a tip, and a head, at least a portion of said shank having threads thereon configured to be threaded into bone structure, said shank having a longitudinal cannula therein, at least one fenestration extending outwardly from said cannula to the exterior of said screw, a
1. A bone screw having a shank, a tip, and a head, at least a portion of said shank having threads thereon configured to be threaded into bone structure, said shank having a longitudinal cannula therein, at least one fenestration extending outwardly from said cannula to the exterior of said screw, a central opening in the outer end of the head configured to form a socket for receiving a driving tool for driving the screw into bone structure, said opening having a first connector inwardly of said socket and being adapted to be connected to a source of bone cement so that bone cement may be delivered to said cannula of said screw and forced out of said at least one fenestration and into bone structure proximate said at least one fenestration, said source of bone cement comprising a cement injection tube adapted to be connected to a suitable bone cement pump, said cement injection tube carrying a second connector adapted to be coupled to said first connector for the delivery of bone cement into said cannula of said bone screw, wherein one of said connectors is a male connector and the other of said connectors is a female connector, said female connector having an opening adapted to receive at least a portion of said male connector and having at least one connection slot comprising an axial slot and a circumferential slot, wherein said male connector has at least one tang configured to be received in a respective connection slot in said female connector so that upon said tang being aligned with the axial slot of its respective connection slot in said female connector and upon said tube being moved axially toward said screw, said tang moves along said axial slot in said female connector until the tang is in register with said circumferential slot whereupon upon rotation of said tube in one direction moves said tang into said circumferential slot thereby to secure said tube to said screw. 2. A bone screw as set forth in claim 1 wherein said cannula stops short of the distal end of the screw such that the screw is a blind end cannulated screw. 3. A bone screw as set forth in claim 1 wherein said cannula extends through the tip of the bone screw so that upon said injection of said cement into said cannula, said cement is forced out of the end of the cannula and into bone structure proximate the tip of the screw. 4. A bone screw as set forth in claim 1 wherein said threads each have a crest and a root, and wherein the outer end of said at least one of said fenestration is substantially centered on a thread crest. 5. A bone screw as set forth in claim 4 wherein said thread crest upon which said at least one fenestration is substantially centered has one edge constituting a leading edge and another edge constituting a trailing edge such that upon rotation of said screw into said bone structure said leading and trailing edges minimize the entry of bone material into said fenestration. 6. A bone screw as set forth in claim 1 wherein said first connector is said female connector and said second connector is said male connector. 7. A bone screw as set forth in claim 1 wherein said female connector has a pair of said connection slots and wherein said male connector has a pair of said tangs with each of said tangs being configured to be received in a respective one said connection slots. 8. A bone screw as set forth in claim 7 wherein each of said circumferential slots has a blind end and a detent proximate said blind end configured to receive a respective tang such that upon rotating said tube in said one direction said tube and said male connector are releasably secured to said connector with said seal being at least partially compressed such that the seal resiliently maintains said male connector and said connector in a mechanically coupled, sealed relation. 9. A bone screw as set forth in claim 8 wherein the end of each said detent toward its respective said axial slot has a sloped cam surface thereon, such that when it is desired to uncouple said tube from said screw, said tube is rotated in the opposite direction thus causing said tangs to encounter their respective said sloped cam surfaces thereby to guide each said tang into its respective said circumferential slot. 10. A bone screw as set forth in claim 9 whereupon further rotation of said tube in said opposite direction causes said tangs to move through said circumferential slots into register with said axial slots at which point said tube may be removed from said screw. 11. A bone screw as set forth in claim 1 further comprising a seal configured to be disposed between said male connector and said connector so that when said tangs are received within said circumferential slots said cement injection tube is sealably connected to said screw. 12. A bone screw as set forth in claim 11 wherein said seal is an O-ring. 13. A bone screw as set forth in claim 11 wherein said seal is carried by said male connector. 14. A bone screw having a shank, a tip, and a head, at least a portion of said shank having threads thereon configured to be threaded into bone structure, said shank having a central longitudinal cannula, one or more fenestrations extending outwardly from said cannula to the exterior of said screw, a central opening in the outer end of said head in communication with said cannula and being configured to form a socket for receiving a driving tool for driving the screw into bone structure, said opening having a female connector within said head inwardly of said socket configured to receive a male connector, the latter being adapted when in communication with a source of bone cement to deliver bone cement to said cannula and to introduce bone cement into said bone structure adjacent said one or more fenestrations when said bone screw is threaded into said bone structure, said female connector having a central opening therethrough adapted to receive said male connector and having a pair of axial slots with each of said axial slots having a circumferential slot extending in a first circumferential direction from its said axial slot, said male connector having a hub on its distal end, a pair of tangs extending outwardly from said hub with each said tang being adapted to be received in a respective said axial slot of said female connector when said hub is received in said central opening of said female connector so that said male connector may move axially with respect to said screw until said tangs are in register with said circumferential slots at which point said male connector may be rotated relative to said screw such that said tangs move into said circumferential slots to thereby sealably connect said male connector to said screw. 15. A bone screw as set forth in claim 14 further comprising a seal between said male connector and said connector. 16. A bone screw as set forth in claim 15 wherein said seal is an O-ring. 17. A bone screw as set forth in claim 14 wherein said male connector is carried on a cement delivery tube with the latter being adapted to be connected to a bone cement pump for delivery of bone cement to said cannula of said screw and to be injected into said bone structure adjacent said fenestrations.
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이 특허에 인용된 특허 (7)
Papay, Francis A.; Byerman, Bryan P., Bone anchoring system.
Sutter Franz (Niederdorf CHX) Straumann Fritz (Waldenburg CHX) Raveh Joram (Oberbottigen CHX), Device comprising an implant and screws for fastening said implant to a bone, and a device for connecting two separated.
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