摘要:
An intervertebral implant includes a first surface configured to engage a first vertebral body, a second surface configured to engage a second vertebral body, a side wall connecting the first surface and the second surface to define a hollow space of the implant, and a rotatable insert configured to be positioned in the space, wherein an elongate opening extends through the side wall into the space, and wherein the insert comprises a spring portion configured to hold the insert in the space by frictional engagement with the side wall and an engagement portion configured to engage with a tool through the opening when the insert is positioned in the space.
摘要:
An instrument for assembling a bone anchoring device includes a shank with a shaft section to be anchored in a bone and a engagement end, a head being separate from the shank and having a through bore, and a receiving part having a first end, a second end and a longitudinal bore extending from the first to the second end, the head being positionable within the bore at the second end. The instrument includes a holding portion arranged to hold a pin, which has a rod section with a length and a diameter suited to fit and extend at least through the bore of the head, and which has a free end portion extending from the rod section such as to project from the bore of the head when the pin is inserted, and configured to engage with the engagement end of the shank.
摘要:
A bone anchoring device includes a bone anchoring element having a head and a shaft, a receiving part for coupling the bone anchoring element to a stabilization element, the receiving part having a bore having a bore axis, a seat member configured to be arranged in the bore and to be rotatable around the bore axis, the seat member forming a seat for polyaxially holding the head, the seat member being configured to allow a greater pivot angle of the bone anchoring element in a first direction compared to other directions when the bone anchoring element and the seat member are in the receiving part, and a pressure member configured to contact the head to exert pressure onto the head, and to be connected to the seat member, such that the pressure member is rotatable together with the seat member around the bore axis.
摘要:
A method for assembling a bone anchoring device includes inserting a bone anchoring element in a first holder of a tool and inserting a receiving part in a second holder of the tool, actuating the tool from a first configuration towards a second configuration to insert a head of the bone anchoring element into the receiving part; continuing actuation of the tool towards the second configuration to move a locking ring and a receiving part body of the receiving part relative to each other until the locking ring assumes a second position with respect to the receiving part body in which the locking ring is latched to the receiving part body in a position where the locking ring compresses a portion of the receiving part body to compress the head, such that the head is held in and cannot be removed from the receiving part body and the bone anchoring element is held adjustably at a first angular position relative to the receiving part, and removing the attached bone anchoring element and receiving part from the tool. The tool is configured for the execution of the steps according to the method.
摘要:
A bone anchoring device includes a shaft for anchoring in a bone and a head, the shaft including a first section having a plurality of barb elements, the barb elements being elastically deformable relative to the body of the shaft, and a second section including a bone thread for engagement with the bone. The first section is located near the tip of the shaft and allows insertion by pushing whereas the second section provides enhanced resistance against pull-out.
摘要:
A bone anchoring device includes a receiving part for receiving a rod, the receiving part has a first bore coaxial with a longitudinal axis and a second bore, and an anchoring element having a first end for insertion into the bone and a second end positionable within a second bore, the anchoring element being movable relative to the receiving part in limited angular range about the longitudinal axis, the angles lying in a single plane. The bone anchoring device further includes a fixation element cooperating with the receiving part to lock the anchoring element relative to the receiving part. The anchoring element is pivotable relative to the receiving part around one rotational axis transverse to the longitudinal axis.
摘要:
A spacer for insertion between two vertebrae includes a variable axial length and comprises a first member having a hollow interior and a tubular wall and a second member having a hollow interior and a tubular wall the second member being slidable within the first member in an axial direction for adjusting an overall length. At least the first member or the second member comprises an access opening in its wall, the opening having a size which is adapted for inserting bone grafts through the opening into the interior. The spacer further comprises a length adjustment structure being engageable with an expansion tool for telescoping the second member relative to the first member and a locking structure for fixing the axial length. The access opening, the length adjustment structure and the locking structure are arranged so as to be accessible from the same side of the spacer. The spacer allows in situ filling of bone grafts into its interior and an improved handling.
摘要:
A receiving part for receiving a rod for coupling the rod to a bone anchoring element, the receiving part including: a receiving part body including a rod receiving portion with a channel for receiving a rod, and a head receiving portion for accommodating a head of a bone anchoring element, the head receiving portion having an open end and being flexible for inserting and clamping of the head; a locking ring around the head receiving portion to exert a first force onto the head receiving portion to lock the head therein; and a pre-locking ring separate from the locking ring and around the head receiving portion to exert a second force less than the first force onto the head receiving portion to clamp the head in a temporary pre-locking position.
摘要:
An implant for use in stabilizing vertebral bodies or bones includes a first end and a second end, a tubular section between the first end and the second end having a longitudinal axis. The tubular section is flexible in such a way that it is expandable in a radial direction when a force acts in an axial direction which reduces the distance between the first end and the second end.
摘要:
A rod assembly for spinal stabilization is provided comprising a flexible tubular element having a first end section and a second end section, an adapter connected to the second end section, the adapter having an engagement structure for connection to other rod portions or other rod assemblies of a spinal stabilization device, wherein at least a portion of the adapter extends into or onto the second end section, a longitudinal core extending through the tubular element, the core having a first end extending through at least a portion of the first end section and a second end extending into the portion of the adapter and being freely movable therein.