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Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0507802 (2012-07-30) |
등록번호 | US-8696711 (2014-04-15) |
발명자 / 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 | 피인용 횟수 : 1 인용 특허 : 476 |
A medical implant assembly includes a polyaxial bone anchor having a shank, a receiver, a lower compression insert with planar surfaces for closely receiving an elongate connecting member with planar surfaces and a one-piece closure structure. The connecting member is made from a polymer. The closur
A medical implant assembly includes a polyaxial bone anchor having a shank, a receiver, a lower compression insert with planar surfaces for closely receiving an elongate connecting member with planar surfaces and a one-piece closure structure. The connecting member is made from a polymer. The closure structure engages both the connecting member and the insert with the engagement between the closure structure and the insert securely locking the polyaxial mechanism even if the connecting member exhibits creep.
1. In a medical implant assembly having a polyaxial bone screw attached to a longitudinal connecting member, the bone screw having a shank, a receiver, and a compression insert, the improvement wherein: a) the receiver has a central bore with a first diameter and a connecting member receiving first
1. In a medical implant assembly having a polyaxial bone screw attached to a longitudinal connecting member, the bone screw having a shank, a receiver, and a compression insert, the improvement wherein: a) the receiver has a central bore with a first diameter and a connecting member receiving first channelb) the insert has a circular base with an outer second diameter, the first diameter being larger than the second diameter, so as to allow the insert to be positionable within the first channel, and an upper portion with a pair of opposed arms each having an inward facing semi-circular surface defining a connecting member receiving second channel, the distance along a straight line intersecting the center of the central bore from one opposed arm inward facing surfaces to the other creating a third diameter, the third diameter being larger than the second diameter; andc) the insert is top-loadable in the receiver in a first orientation such that the second channel is substantially perpendicular to the first channel, and then rotated to a second orientation such that the second channel is substantially parallel to the first channel. 2. A medical implant comprising: a) a bone screw shank having an upper portion;b) a receiver having a cavity operably receiving the shank upper portion in the cavity thereof; the receiver having a pair of upstanding arms forming a channel therebetween and having a first width on sides of the channel; the receiver also having an axis and an axial bore between the arms having a first diameter; the channel being sized and shaped to receive a rod during use; and the receiver having a pair of opposed grooves located along the channel; andc) a compression insert loaded through the channel and being positioned above the shank in the receiver during use; the insert having a circular body with a second diameter sized such that the second diameter is less than the first diameter; the insert also having a pair of flanges that extend radially outward from diagonally opposite sides of the body; the flanges each having a side to side second width that is less than the channel first within; whereby the insert is insertable through the channel with the flanges extending from respective open sides of the channel and then rotatable ninety degrees so that the flanges enter the grooves to secure the insert in the receiver. 3. In a medical implant assembly having a polyaxial bone screw attachable to a longitudinal connecting member, the bone screw having a shank and a receiver for receiving the connecting member, the improvement wherein the bone screw includes: a) a compression insert having a base with a first diameter and a pair of opposed arms extending from the base, the opposed arms forming an insert channel with a second diameter larger than the first diameter such that the insert is top-loaded into the receiver, only when in a first orientation wherein the insert channel is substantially perpendicular to a receiver channel, and then rotatable to a second orientation, wherein the channels are aligned; andb) the arms being engageable by a single piece anti-splay closure when the connecting member is positioned within the insert channel and locked by the closure, the closure being sized and shaped for simultaneous engagement of a top surface of each of the insert arms. 4. In a medical implant assembly having a polyaxial bone screw attachable to a longitudinal connecting member, the bone screw having a shank and a receiver for receiving the connecting member, the improvement wherein the bone screw includes: a) a compression insert having a base, a pair of opposed upright arms with top surfaces, the arms forming an insert channel therebetween and an alignment structure configured to cooperate with the receiver, and wherein the insert channel has an engagement surface for seating the connecting member; andb) both top surfaces of the arms being engageable by a single piece anti-splay closure when the connecting member is positioned within the insert channel and locked by the closure, the closure being sized and shaped for simultaneous engagement of a top surface of each of the insert arms. 5. A polyaxial bone screw comprising: a) a shank having an upper portion;b) a receiver with a cavity sized and shaped to receive the shank upper portion, the receiver having an upper first channel sized and shaped to be adapted to receive an elongate member;c) a pressure insert received in the receiver above the shank capture portion and having a pair of upward extending arms forming a second channel that is adapted to receive the elongate member with the arms extending above the elongate member;d) a monolithic piece closure that is received in the first channel above the elongate member so as to capture the elongate member in the first channel, the closure having a bottom surface that engages a top of the pressure insert arms so that when the closure is advanced downwardly in the first channel a downward pressure is applied to the pressure insert; ande) wherein the elongate member is constructed of a plastic material and the closure does not compress the elongate member as the closure is advanced downwardly in the first channel.
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