최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
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국제특허분류(IPC7판) |
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출원번호 | US-0385997 (2012-03-20) |
등록번호 | US-10194951 (2019-02-05) |
발명자 / 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 0 인용 특허 : 442 |
A polyaxial bone screw assembly includes a threaded shank body having an integral shank head receivable in a one-piece receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. A compression insert (some with an independent t
A polyaxial bone screw assembly includes a threaded shank body having an integral shank head receivable in a one-piece receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. A compression insert (some with an independent tool lock, lock and release feature and/or friction fit feature) and a split retaining ring articulatable with respect to both the shank head and the receiver (prior to locking) cooperate with the receiver to provide for pop- or snap-on assembly of the shank with the receiver either prior to or after implantation of the shank into a vertebra.
1. A bone anchor, comprising: a shank having a body for fixation to a bone and an upper portion having a partially spherical surface;a receiver having a top portion and a base with a lower opening, each of the top portion and the base being integrally formed with the receiver, the receiver top porti
1. A bone anchor, comprising: a shank having a body for fixation to a bone and an upper portion having a partially spherical surface;a receiver having a top portion and a base with a lower opening, each of the top portion and the base being integrally formed with the receiver, the receiver top portion defining a first open channel, the base defining an upper cavity portion and having a curved surface partially defining a lower cavity portion, the upper cavity portion having a diameter greater than a maximum diameter of the lower cavity portion, the channel communicating with the lower opening through each of the upper cavity portion and the lower cavity portion, the shank upper portion being bottom-loadable into the base through the lower opening;an insert disposed within the receiver, the insert having a bottom with a concave surface operatively frictionally slideably mateable with the shank upper portion spherical surface; anda resilient open retainer captured within the base and expandable within the upper cavity portion about the upper portion of the shank during bottom-loading of the upper portion of the shank, the open retainer having a partial spherical inner surface for a first polyaxial articulatable engagement with the shank upper portion during positioning and the open retainer having a partial spherical outer surface for a second polyaxial articulatable engagement with the receiver curved surface during positioning after bottom-loading of the upper portion of the shank,wherein the retainer pivots with respect to both the shank upper portion and the receiver prior to being locked within the receiver. 2. The bone anchor of claim 1, wherein the receiver curved surface has a first radius and the retainer outer surface has a second radius, the first radius being substantially equal to the second radius. 3. The bone anchor of claim 1, wherein the retainer inner surface has a first radius and the shank substantially spherical surface has a second radius, the first radius being substantially equal to the second radius. 4. The bone anchor of claim 1, wherein the insert further comprises a set of opposed arms such that one of the insert arms has an outer surface engaging the receiver top portion. 5. The bone anchor of claim 4, wherein the receiver top portion has a surface crimped inwardly against one of the insert arms. 6. The bone anchor of claim 1, wherein the insert is top loaded into the receiver and then rotated into a position above the retainer with the second channel aligned with the first channel. 7. The bone anchor of claim 1, wherein the receiver top portion has a first pair of opposed tool receiving through apertures formed therein and the insert has a second pair of opposed tool receiving apertures in alignment with the first pair of apertures, the first pair of apertures sized and shaped to provide tool access to the insert, each of the second pair of opposed tool receiving apertures having a tool receiving surface sized and shaped to allow a tool to press the insert downwardly into temporary locking engagement with the shank. 8. The bone anchor of claim 7, wherein the receiver top portion has a sloping surface communicating with each of the first pair of apertures, each sloping surface sized and shaped for aligning a tool with the respective insert tool receiving surface. 9. The bone anchor of claim 8, wherein the receiver top portion sloping surface is a first sloping surface and the insert has a second sloping surface substantially aligned with the first sloping surface, the second sloping surface being adjacent to and oriented at an obtuse angle with respect to one of the insert tool receiving surfaces. 10. The bone anchor of claim 1, wherein the retainer has a top surface and a slit. 11. The bone anchor of claim 10, wherein the slit is disposed at an obtuse angle with respect to the top surface. 12. The bone anchor of claim 10, wherein the retainer top surface is planar. 13. The bone anchor of claim 1, wherein the insert is spaced from the retainer in all angular orientations of the shank with respect to the receiver. 14. A bone anchor, comprising: a shank having a body for fixation to a bone and an integral head having a curved surface;a receiver having a top portion and a base, each of the top portion and the base being integrally formed with the receiver, the receiver top portion defining an open channel, the base defining an upper cavity portion and a first surface partially defining a lower cavity portion, the upper cavity portion having a diameter greater than a maximum diameter of the lower cavity portion, the receiver having a tool receiving through aperture in communication with the open channel through each of the upper cavity portion and the lower cavity portion, the shank upper portion being bottom-loadable into the receiver cavity through the lower opening;an insert disposed within the receiver, the insert sized and shaped to directly engage with the shank head curved surface and to cooperate with lock and release tools that extend through the receiver tool receiving aperture for pressing the insert downwardly against the shank head into one of non-floppy sliding engagement and temporary locking engagement with the shank head; anda resilient open retainer captured within the base and expandable within the upper cavity portion about a portion of the shank head during bottom-loading of the portion of the shank head, the retainer having a first polyaxial articulation with the shank head and a second polyaxial articulation with the receiver during positioning prior to the temporary locking engagement of the insert with respect to the shank,wherein expansion-only engagement occurs between the shank head and the retainer and between the retainer and the receiver. 15. The bone anchor of claim 14, wherein the tool receiving aperture is a pair of opposed tool receiving apertures and the insert has a pair of opposed recessed tool receiving surfaces formed in outer walls thereof, the recessed tool receiving surfaces formed in the outer walls thereof, the recessed tool receiving surfaces being accessible through the receiver tool receiving apertures. 16. The bone anchor of claim 14, wherein the receiver has a first tool receiving sloping surface adjacent the through aperture and the insert has a second tool receiving surface generally aligned with the first tool receiving sloping surface. 17. The bone anchor of claim 16, wherein the insert tool receiving surface forms a v-shaped recess. 18. A bone anchor comprising: a shank having a body for fixation to a bone and an integral head having a spherical surface;a receiver having a top portion and a base with a lower opening, each of the top portion and the base being integrally formed with the receiver, the receiver top portion having a first set of opposed arms defining an open channel, the base defining an upper cavity portion and having a spherical surface partially defining a lower cavity portion, the upper cavity portion having a diameter greater than a maximum diameter of the lower cavity portion, the channel communicating with the lower opening through each of the upper cavity portion and the lower cavity portion, each receiver arm having a tool receiving sloping surface and a through aperture, the shank upper portion being bottom-loadable into the base through the lower opening;a top loaded insert disposed within the receiver, the insert having a spherical surface sized and shaped to directly engage with the shank head spherical surface, the insert having a second set of opposed arms, each arm having a recessed surface aligned with one of the receiver sloping surfaces and sized and shaped for receiving lock and release tools that extend through the receiver tool receiving apertures for pressing the insert downwardly into a slideable engagement with the shank head; anda resilient open retainer captured within the base and expandable within the upper cavity portion about a portion of the shank head spherical surface during bottom-loading of the upper portion of the shank, the retainer having a first polyaxial articulation with the shank head spherical surface and a second polyaxial articulation with the receiver spherical surface during positioning after bottom-loading of the upper portion of the shank and prior to being positioned in a locked position, and wherein the retainer being in expansion-only engagement between the shank head and the receiver when the shank is in a locked position with respect to the receiver. 19. The bone anchor of claim 18, wherein the receiver has first and second inner surfaces, the first inner surface sized and shaped to engage the shank head spherical surface and the second inner surface sized and shaped to engage the receiver spherical surface. 20. The bone anchor of claim 18, wherein the insert is top loaded into the receiver. 21. The bone anchor of claim 18, wherein the retainer is top loaded into the receiver.
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