IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0694032
(2012-10-22)
|
등록번호 |
US-8840652
(2014-09-23)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
268 |
초록
▼
Polyaxial bone anchors include a retainer for holding a shank within a receiver, the retainer being in at least two discrete pieces and cooperating with a variety of inserts, some of which independently lock the polyaxial mechanism. Polyaxial and mono-axial bone anchor assemblies include pivot and/o
Polyaxial bone anchors include a retainer for holding a shank within a receiver, the retainer being in at least two discrete pieces and cooperating with a variety of inserts, some of which independently lock the polyaxial mechanism. Polyaxial and mono-axial bone anchor assemblies include pivot and/or pressure inserts or pads that cooperate with longitudinal connecting members to provide a desired degree of continued control of angulation of the longitudinal connecting member in the sagittal plane or to hold the connecting member in place. Pressure pads for deformable rods may also be made from a deformable plastic material.
대표청구항
▼
1. A polyaxial bone screw assembly comprising: a) a shank having an elongate body and an upper portion, the body being configured for fixation to a bone, the shank supper portion having a lower neck and an upper region that extends radially outward from the neck and has a lower semispherical surface
1. A polyaxial bone screw assembly comprising: a) a shank having an elongate body and an upper portion, the body being configured for fixation to a bone, the shank supper portion having a lower neck and an upper region that extends radially outward from the neck and has a lower semispherical surface;b) a receiver having a top portion and a base, the receiver top portion having an upper channel adapted to receive a longitudinal connecting member, the base having an internal seating surface partially defining a cavity, the channel communicating with the cavity, the cavity communicating with an exterior of the base through an opening; the shank upper portion being received through the opening and positioned within the cavity;c) a retainer having an inner surface and an outer surface, the retainer inner surface configured to be in pivotal engagement with the shank upper portion semispherical surface and the retainer outer surface configured to be in engagement with the receiver seating surface when the retainer is captured between the shank upper portion and the seating surface, the retainer preventing the shank upper portion from passing through the receiver opening allowing the shank to move polyaxially relative to the receiver during positioning, the retainer includes two discrete portions that are not joined together. 2. The assembly according to claim 1 including: a) a compression insert disposed within the receiver, the insert being sized and shaped to frictionally engage the shank upper portion. 3. The assembly according to claim 2 including: a) at least one of a pivot insert and a compression pad located in a recess of the compression insert and having a surface adapted to engage a longitudinal connecting member received in the channel. 4. A polyaxial bone screw assembly comprising: a) a shank having an elongate body and an upper portion, the body being configured for fixation to a bone;b) a receiver having a top portion and a base, the receiver top portion having a channel adapted to receive a longitudinal connecting member, the base having an internal seating surface partially defining a cavity, the channel communicating with the cavity, the cavity communicating with an exterior of the base through an opening;c) a retainer having an inner surface and an outer surface, the inner surface configured to be engagement with the shank upper portion and the outer surface configured to be in engagement with the receiver seating surface when the retainer is captured between the shank upper portion and the seating surface, cooperating to prevent the shank upper portion from passing through the receiver opening; the retainer having two separate portions that are not physically joined together but abut against each other and the shank;d) a compression insert disposed within the receiver and configured to frictionally engage the shank upper portion and adapted to engage the connecting member. 5. A polyaxial bone screw assembly comprising: a) a shank having an elongate body and an upper portion, the body being configured for fixation to a bone;b) a receiver having a top portion and a base, the receiver top portion defining a channel to receive a longitudinal connecting member, the base having an internal seating surface partially defining a cavity, the channel communicating with the cavity, the cavity communicating with an exterior of the base through an opening sized and shaped to upwardly load the shank upper portion through the opening;c) a retainer having an inner surface and an outer surface, the inner surface configured to be in engagement with the shank upper portion and the outer surface configured to be in engagement with the receiver seating surface when the retainer is captured between the shank upper portion and the seating surface, the retainer preventing the shank upper portion from passing down through the receiver opening and the retainer moving with the shank in polyaxial rotation with respect to the receiver;d) a compression insert disposed within the receiver the insert sized and shaped to frictionally engage the shank upper portion at a location spaced from the retainer;e) a discrete compression pad located in a recess of the compression insert and having a first surface engaging a longitudinal connecting member and an opposed second surface engaging the shank upper portion. 6. A polyaxial bone screw assembly comprising: a) a shank having an elongate body and an upper portion, the body being configured for fixation to a bone;b) a receiver having a top portion and a base, the receiver top portion defining a channel to receive a longitudinal connecting member, the base having an internal seating surface partially defining a cavity, the channel communicating with the cavity, the cavity communicating with an exterior of the base through an opening;c) a retainer having an inner surface and an outer surface, the inner surface configured to be in engagement with the shank upper portion and the outer surface configured to be in engagement with the receiver seating surface when the retainer is captured between the shank upper portion and the seating surface, the retainer preventing the shank upper portion from passing down through the receiver opening and the retainer moving with the shank in polyaxial rotation with respect to the receiver;d) a compression insert disposed within the receiver, the insert being sized and shaped to frictionally engage the shank upper portion; ande) a discrete compression pad located in a recess of the compression insert and having a surface engaging a longitudinal connecting member.
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