IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0800314
(2010-05-12)
|
등록번호 |
US-8398682
(2013-03-19)
|
발명자
/ 주소 |
- Jackson, Roger P.
- Timm, Jens Peter
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
9 인용 특허 :
338 |
초록
▼
A polyaxial bone screw assembly includes a threaded shank body having an upper head portion with a mating segment and a first partial spherical surface, a retainer structure being mateable with the mating segment of the upper head portion, the retainer structure having a second partial spherical sur
A polyaxial bone screw assembly includes a threaded shank body having an upper head portion with a mating segment and a first partial spherical surface, a retainer structure being mateable with the mating segment of the upper head portion, the retainer structure having a second partial spherical surface such that when mated, the first and second partial spherical surfaces form a spherical ball member, a receiver defining an open channel and having a base with a seating surface partially defining a cavity, the open channel communicating with the cavity, the cavity communicating with an exterior of the base through an opening sized and shaped to receive the shank upper head portion therethrough, and a bushing sized and shaped to fit within open channel and cavity, the bushing having a lower rounded surface engageable with a top surface of the spherical ball member formed by the shank and retainer structure.
대표청구항
▼
1. A polyaxial bone screw assembly comprising: (a) a shank having a body for fixation to a bone and an upper head portion, the upper head portion having a mating segment and a first partial spherical surface;(b) a retainer structure being mateable with the mating segment of the upper head portion, t
1. A polyaxial bone screw assembly comprising: (a) a shank having a body for fixation to a bone and an upper head portion, the upper head portion having a mating segment and a first partial spherical surface;(b) a retainer structure being mateable with the mating segment of the upper head portion, the retainer structure having a second partial spherical surface such that when mated, the first and second partial spherical surfaces form at least a partial spherical ball member;(c) a receiver defining an open channel and having a base with a lower seating surface partially defining a cavity, the seating surface being sized and shaped to engage at least a portion of the spherical ball member, the open channel communicating with the cavity, the cavity communicating with an exterior of the base through an opening sized and shaped to receive the shank upper head portion by uploading the upper head portion through the opening; the upper head portion mating with the retainer within the cavity; and(d) a bushing sized and shaped to fit at least partially within the open channel and cavity, the bushing having a lower rounded surface engageable with at least a portion of the spherical ball member; wherein(e) the shank mating segment and the retainer structure cam together so as to form the spherical ball member. 2. The assembly of claim 1, wherein the shank mating segment includes a pair of recesses and a first engagement wall. 3. The assembly of claim 2, wherein the retainer structure further comprises a pair of protrusions and a second engagement wall. 4. The assembly of claim 3, wherein the pair of recesses of the shank are mateable with the pair of protrusions of the retainer structure, and the first engagement wall of the shank is mateable with the second engagement wall of the retainer structure. 5. The assembly of claim 1, wherein the retainer is loaded into the receiver through the open channel for assembly with the shank upper portion in the cavity. 6. The assembly of claim 1, further comprising a closure top engageable with the open channel of the receiver. 7. The assembly of claim 1, wherein a) the receiver base includes a pair of opposed symmetrical openings adapted for increased polyaxial motion of the receiver with respect to the shank, said increased polyaxial motion being in only one plane. 8. A polyaxial bone screw assembly, comprising: a shank comprising a threaded shaft and an upper head portion, the upper head portion including a first partial spherical surface;a retainer structure being mateable with the upper head portion, the retainer structure having a second partial spherical surface such that when the retainer structure is cammed together with the shank, the first and second partial spherical surfaces form at least a partial spherical ball member with a top surface;a receiver having an upper portion and a lower portion with a cavity, the receiver having a first opening at the upper portion and a second opening at the lower portion extending along a first axis, the second opening being sized and shaped to provide for uploading the shank upper head portion therethrough; the shank upper head portion mating with the retainer structure within the cavity; the upper portion comprising two spaced apart arms each being internally threaded and defining gaps therebetween, the upper portion further comprising a U-shaped channel extending along a second axis transverse to the first axis adapted to receive a rod member, the lower portion having a shaped wall, the wall being sized and shaped to at least partially engage the spherical ball member; anda bushing comprising a lower rounded surface, wherein the rounded surface is engageable with a surface of the spherical ball member formed by the shank and retainer structure. 9. The assembly of claim 8, wherein the upper head portion of the shank further comprises a mating segment including a pair of recesses and a first engagement wall. 10. The assembly of claim 9, wherein the retainer structure further comprises a pair of protrusions and a second engagement wall. 11. The, assembly of claim 10, wherein the pair of recesses of the mating segment are mateable with the pair of protrusions of the retainer structure, and the first engagement wall of the mating segment is mateable with the second engagement wall of the retainer structure. 12. The assembly of claim 8, wherein the retainer is loaded into the receiver through the open channel for assembly with the shank upper portion in the cavity. 13. The assembly of claim 8, further comprising a closure top engageable with open channel of the receiver. 14. The assembly of claim 8, wherein the bushing further comprises a pair of outwardly extending protrusions. 15. The screw assembly of claim 8, wherein the lower portion of the receiver further includes a restrictive neck with a cavity formed therein. 16. The assembly of claim 8, wherein a) the receiver lower portion includes a pair of opposed symmetrical openings adapted for increased polyaxial motion of the receiver with respect to the shank, said increased polyaxial motion being in only one plane. 17. A variable angle spinal screw assembly, comprising: a housing having an upper portion, an intermediate portion, and a lower portion and defining a first axis extending between the upper and lower portions, the housing having a first opening at the upper portion and a second opening at the lower portion, the upper portion comprising two spaced apart arms each being internally threaded and defining gaps therebetween, the upper portion further comprising a U-shaped channel extending along a second axis transverse to the first axis and adapted to receive a rod member, the lower portion of the housing comprising a lower restrictive neck below a cavity formed therein, and the intermediate portion comprising a substantially cylindrical inner wall below the two spaced apart arms and above the lower restrictive neck;a bushing comprising an upper surface defining a seat for receiving the rod member and a lower rounded surface, the bushing comprising on opposite sides thereof a pair of outwardly extending protrusions, wherein the bushing is receivable into the housing through the first opening with the protrusions passing through the gaps between the two spaced apart arms, and the protrusions are engageable with the substantially cylindrical inner wall of the intermediate portion by rotation of the bushing for frictional engagement therebetween;a shank comprising a threaded shaft and an upper head portion, the upper head portion comprising a first partial spherical surface proximate a mating segment including an engagement wall and a pair of recesses with the shank upper head portion being uploaded through the second opening of the housing; anda retainer structure comprising a second partial spherical portion proximate a pair of protrusions, the retainer structure being insertable through the first opening of the housing prior to insertion of the bushing through the first opening of the housing, wherein the pair of protrusions are mateable with the pair of recesses such that the retainer structure and the shank upper head structure cam together and the second partial spherical portion is engageable with the lower rounded surface when the retainer structure is positioned in the housing to form a spherical ball joint capable of engaging the lower rounded surface of the bushing upon insertion of the bushing into the housing. 18. The assembly of claim 17, wherein a) the housing lower portion includes a pair of opposed symmetrical openings adapted for increased polyaxial motion of the housing with respect to the shank, said increased polyaxial motion being in only one plane.
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