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 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0924802 (2010-10-05) |
등록번호 | US-8556938 (2013-10-15) |
발명자 / 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 28 인용 특허 : 490 |
A polyaxial bone screw assembly includes a threaded shank body having an integral upper portion receivable in a receiver, the receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. The upper portion expands a retaining mem
A polyaxial bone screw assembly includes a threaded shank body having an integral upper portion receivable in a receiver, the receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. The upper portion expands a retaining member in the receiver cavity to capture the shank upper portion in the receiver. In some embodiment either the retaining member or an insert provide for a friction fit of the shank upper portion in the receiver resulting in non-floppy placement of the shank with respect to the receiver. Some retainers and inserts have a lock-and-release feature. Final locking of the polyaxial mechanism is provided by frictional engagement between the shank upper portion and the retaining member. A pre-assembled receiver, retaining member and optional insert may be popped-on or snapped-on to the shank upper portion prior to or after implantation of the shank into a vertebra.
1. In a polyaxial bone anchor, the improvement comprising: a) a receiver defining a chamber communicating with a channel, the channel sized and shaped for receiving a portion of a longitudinal connecting member, the chamber having an upper and lower portion;b) a shank having an upper portion and the
1. In a polyaxial bone anchor, the improvement comprising: a) a receiver defining a chamber communicating with a channel, the channel sized and shaped for receiving a portion of a longitudinal connecting member, the chamber having an upper and lower portion;b) a shank having an upper portion and the chamber upper portion being wider than the shank upper portion; andc) an expandable a retainer having a non-expanded configuration and an expanded configuration, the retainer being narrower than the chamber upper portion in the non-expanded configuration, the retainer being located in the chamber lower portion in the non-expanded configuration, the retainer being pushed to the chamber upper portion during assembly when the shank upper portion is uploaded into the receiver chamber, and thereafter the retainer expanding to the expanded configuration, so as to receive the shank upper portion therethrough and capture the shank upper portion in the chamber by returning to the non-expanded configuration. 2. The improvement of claim 1 wherein the retainer has a super structure frictionally engaging the shank when the retainer and the shank are in an unlocked engagement. 3. The improvement of claim 1 wherein the shank upper portion is in spaced relation with the receiver when in the locked orientation with respect to the receiver. 4. The improvement of claim 1 wherein the retainer is expanded outwardly against the receiver when in locking engagement with the shank upper portion. 5. The improvement of claim 1, wherein the retainer has a surface releasably wedged against a surface of the receiver. 6. The improvement of claim 1 further comprising a compression insert in engagement with the shank upper portion and located between the shank upper portion and the portion of the longitudinal connecting member located in the receiver channel. 7. The improvement of claim 6 wherein the insert has at least one surface frictionally engaging the shank in a non-floppy manner when the shank is in an unlocked orientation with respect to the receiver. 8. The improvement of claim 1 further comprising an insert in one of a locking and non-locking engagement with the shank upper portion. 9. The improvement of claim 8 wherein the shank upper portion directly engages the longitudinal connecting member portion. 10. The improvement of claim 1 wherein the retainer is up-loadable into the receiver. 11. The improvement of claim 1 wherein the retainer is down-loadable into the receiver. 12. The improvement of claim 11 wherein the retainer is expandable only. 13. The improvement of claim 1 wherein the retainer is both expandable and compressible. 14. The improvement of claim 1 further comprising an up-loadable compression insert. 15. The improvement of claim 1 further comprising a down-loadable compression insert. 16. The improvement of claim 15 wherein the receiver channel is a first channel and the insert has a second channel, the insert is rotated into position above the retainer, the insert having a blocking feature and the receiver having a stop for abutment with the blocking feature when the second channel is aligned with the first channel. 17. The improvement of claim 15 wherein the insert further comprises a pair of crown collet extensions, the collet extensions engage and expand about the shank upper portion at the same time as the retainer expands around the shank when the shank is uploaded into the receiver chamber. 18. The improvement of claim 17 wherein the insert expands about the shank upper portion simultaneously with the retainer expanding about the shank upper portion. 19. The improvement of claim 1 further comprising a compression insert, the receiver having at least one of crimp tabs and spring tabs to capture the insert within the receiver. 20. The improvement of claim 19 wherein the receiver channel is a first channel and the insert has a second channel, the one of the crimp tabs and spring tabs aligning the second channel with the first channel. 21. The improvement of claim 1 wherein the retainer is an open ring. 22. The improvement of claim 21 wherein the ring has at least one planar surface. 23. The improvement of claim 1 wherein the retainer has an open, non-tapered body portion in engagement with the receiver and a super structure having panels for temporary frictional engagement with the shank upper portion when the retainer is not locked to the receiver. 24. The anchor according to claim 1, wherein: the chamber lower portion is approximately the same diameter as the retainer in the non-expanded configuration so as to prevent the retainer from expanding when the retainer is in the chamber lower portion. 25. In a polyaxial bone anchor, the improvement comprising: a) a receiver defining a chamber having an upper and lower portion communicating with a channel, the channel sized and shaped for receiving a portion of a longitudinal connecting member;b) a shank having an upper portion and the chamber upper portion being wider than the shank upper portion; andc) an expandable open retainer having a non-expanded configuration and an expanded configuration, the retainer being narrower than the chamber upper portion in the non-expanded configuration, and being located in the chamber lower portion in the non-expanded configuration, the retainer being pushed to the chamber upper portion during assembly when the shank upper portion is uploaded into the receiver chamber, and thereafter the retainer expanding to the expanded configuration, so as to receive the shank upper portion therethrough and capture the shank upper portion in the chamber by returning to the non-expanded configuration, and thereafter received between the shank upper portion and the receiver chamber lower portion, so as to prevent expansion of the retainer to the expanded configuration. 26. The improvement of claim 25 wherein the retainer has a super structure frictionally engaging the shank when the retainer and the shank are in an unlocked engagement. 27. The improvement of claim 25 further comprising an insert located at least partially in the chamber, the insert having at least one surface frictionally engaging the shank when the retainer and the shank are in an unlocked engagement. 28. The improvement of claim 27 wherein the insert has a lock and release feature in engagement with the receiver. 29. The improvement of claim 25 wherein the retainer has a lock and release feature in engagement with the receiver. 30. A medical implant comprising: a) a receiver having a base with an inner cavity and a pair of upstanding opposed arms partially defining a longitudinal connecting member receiving channel, the base inner cavity defined in part by a lower seating portion and an upper expansion chamber, the lower seating portion communicating with a bottom opening of the receiver base and the upper expansion chamber communicating with the longitudinal connecting member receiving channel;b) a bone screw shank having an upper portion sized for up-loading through the receiver lower opening and having a region of greatest diameter; andc) an open, expandable retaining member sized and shaped for expanding about the shank upper portion when the retaining member is pushed into the receiver upper expansion chamber by the shank upper portion being uploaded into the receiver bottom opening, so that the shank region of greatest diameter passes through the retainer when the retainer is in an expanded configuration and the retainer captures the shank upper portion in the inner cavity by the retainer returning to a non-expanded configuration, the retaining member thereafter preventing the shank upper portion from passing out of the receiver through the bottom opening. 31. A polyaxial bone anchor, comprising: a) a receiver defining a chamber communicating with a channel, the channel sized and shaped for receiving a longitudinal connecting member, the chamber having an upper and lower portion;b) a shank having an upper portion and the chamber upper portion being wider than the shank upper portion;c) an expandable retainer having a non-expanded configuration and an expanded configuration, the retainer being narrower than the chamber upper portion in the non-expanded configuration, the retainer being located in the chamber lower portion in the non-expanded configuration, the retainer being pushed to the chamber upper portion during assembly when the shank upper portion is uploaded into the receiver chamber, and thereafter the retainer expanding to the expanded configuration, so as to receive the shank upper portion therethrough and capture the shank upper portion in the chamber by returning to the non-expanded configuration; andd) a compression insert, the receiver having spring tabs cooperating with insert to capture the insert within the receiver. 32. A medical implant comprising: a) a receiver having a base with an inner cavity and a pair of upstanding opposed arms partially defining a longitudinal connecting member receiving channel, the base inner cavity defined in part by a lower seating portion and an upper expansion chamber, the lower seating portion communicating with a bottom opening of the receiver base and the upper expansion chamber communicating with the longitudinal connecting member receiving channel;b) a bone screw shank having an upper portion with a semi-spherical head sized for up-loading through the receiver lower opening; andc) an expandable retainer having a non-expanded configuration and an expanded configuration, the retainer being narrower than the chamber upper portion in the non-expanded configuration, the retainer being positionable in the chamber lower portion in the non-expanded configuration, the retainer being pushed to the chamber upper portion during assembly, when the shank upper portion is uploaded into the receiver chamber, and thereafter the retainer expanding to the expanded configuration, so as to receive the shank head therethrough and capture the shank upper portion in the chamber by returning to the non-expanded configuration; andd) a compression insert, the receiver having a spring tab adapted to cooperate with the insert to capture the insert within the receiver, the insert having at least one groove with an interior surface and at least a pair of crown collet extensions, the collet extensions expanding to receive and capture the head and thereafter push the retainer down into the lower seating portion, the insert frictionally locks by moveably holding the shank in a selected angular position relative to the receiver when the insert is positioned and rotated such that the spring tabs snap into the groove interior surface of the insert. 33. In a polyaxial bone screw having a receiver with an inner cavity and a shank with an upper portion that is at least partially spherically shaped and is widest at a first width, the shank upper portion being uploaded into the cavity through an aperture having a second width bigger than the first width; the screw having a retainer for maintaining the shank upper portion in the cavity of the receiver; the improvement wherein: the retainer is expandable and moveable between a non expanded configuration and an expanded configuration, in the non-expanded configuration the retainer has an outer third width larger than the first width, in the expanded configuration the retainer has an inner fourth width larger than the upper portion second width, such that when the shank upper portion is loaded into the receiver, the upper portion engages and expands the retainer to where the upper portion is widest, the upper portion passes through the retainer and thereafter the retainer returns to the non-expanded configuration so as to maintain the shank in the receiver.
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