A fastener assembly for a spinal fixation system that is particularly useful in treatment of pediatric and small-statured patients includes a fastener, an attachment member, and a locking member The fastener has a lower portion for contacting a bone and an upper portion integral with the lower portion The upper portion has two open channels Each channel is configured and dimensioned to receive a portion of a longitudinal or connecting member along its circumference The attachment member is positionable on the fastener and at least partially covers the channel that receives the longitudinal or connecting member The locking member is operatively associated with the upper portion of the fastener and secures the attachment member and the longitudinal or connecting member to the fastener

Spinal fixation system

Devices and surgical methods treat various types of adult spinal pathologies, such as degenerative spondylolisthesis, spinal stenosis, degenerative lumbar scoliosis, and kypho-scoliosis. Various types of spinal joint replacement prostheses, surgical procedures for performing spinal joint replacements, and surgical instruments are used to perform the surgical procedures.

Facet arthroplasty devices and methods

A spinal plate system and method for fixation of the human spine is provided. In an embodiment, the system includes a bone plate, a bone screw and a ring. The bone screw preferably connects the bone plate to a bone, and the ring preferably fixes the bone screw into a borehole of the bone plate such that the bone screw extends from the bone plate at a selected angle. The ring is preferably capable of swiveling within the borehole to allow the bone screw to be angulated at a plurality of angles oblique to the plate. The bone screw may have a head having a tapered, threaded surface for engaging the ring. The ring preferably has threading on its inner surface for mating with the threading on the head. The inner surface of the ring may be tapered. Movement of the head through the ring preferably expands the ring against the bone plate to fix the bone screw at a selected angle relative to the bone plate.

System and method for stabilizing the human spine with a bone plate

A multi-axial bone screw assembly (10) includes a bone screw (11) having a partially spherical head (22). The bone screw head (22) is truncated at an upper surface (24) in which a tool receiving recess (25) is defined. The assembly includes a receiver member (12) including a central bore (34) that defines a tapered recess (35) to receive a contracting collet (13) carrying the head (22) of the bone screw (11). The bore (34) of the receiver member also defines a channel (33) communicating with the recess and configured to receive a spinal rod (R) therein. A portion (37) of the channel is threaded to receive a set screw (14) above the rod. The assembly (10) also includes a contracting collet (13) disposed between the rod (R) and the head (22) of the bone screw (11). The collet (13) defines a partially spherical recess (45) to receive the head (22) of the bone screw, and includes deflectable fingers (50) that substantially surround the screw head. As the set screw (14) is tightened into the receiver member (12), the set screw (14) compresses the rod (R) against the collet (13), which presses the collet (13) into the tapered recess (35) of the receiver member (12), thereby deflecting the fingers (50) of the collet against the bone screw head.

Multi-axial bone screw assembly

The disclosure relates to devices and methods for implantation of an orthopedic device between skeletal segments using limited surgical dissection. The implanted devices are used to adjust and maintain the spatial relationship(s) of adjacent bones. Depending on the implant design, the motion between the skeletal segments may be increased, limited, modified, or completely immobilized.

Devices and methods for inter-vertebral orthopedic device placement

A spinal screw or hook has a slotted head to receive a support rod. A two-piece rod retainer is provided with an outer ring-like collar locked into the interior of the slotted head and a fastener extending through the collar to contact a support rod in the bottom of the slot.

Posterior spinal implant

An osteosynthetic fixation device consists of a fixation element 1 which has a conical head section 11 and an anchoring element 12 abutting it which is for attachment into the bone. The fixation device also consists of a spherically formed, layered, slotted clamping piece 2 which has a conical borehole 21 for installation of the conical head section 11, and which is meant for locking within a connecting piece 3 equipped with a spherically shaped layered borehole 31. Fixation piece 1 has an axially arrayed tension element 4, permitting axial displacement and wedging of conical head section 11 in the borehole 21 that corresponds with it. The fixation device is appropriate for use as a plate/screw system, an internal or external fixator, and in particular for spinal column fixation.

Osteosynthetic fixation device

A clamp connection serves to connect two construction components, in particular for an osteo-synthetic fixation device in a structure in which the construction components are off-set from the force axis of the loading force that retains them.

Clamp connection for connecting two construction components for a setting device, particularly an osteosynthetic setting device

A posterior vertebral column implant is useful for a vertebral column supporting device having a supporting rod (1). The implant has an anchoring section (2) designed as a screw or hook, a fastening head (3) provided with a U-shaped slit (6) for the supporting rod (1) which forms two branches (4, 5), and fixing means (7, 8) for fixing the fastening head (3) to the supporting rod. The fixing means (7, 8) are made of two pieces. One cylindrical locking piece (7) may be axially introduced from above into the U-shaped slit (6) and be blocked there and a fixing piece (8) may be brought to bear on the supporting rod (1) through the first locking piece (7).

Posterior vertebral column implant

A clamping joint (10) is intended for connecting two construction elements (12, 14), in particular for an osteosynthetic fixator. It comprises a connecting element (15), two clamping elements (18) and two bracing means (16, 16') allocated thereto and beside each of which a transverse construction element which can be clamped between the connecting element (15) and the clamping element (18) is provided. Opposite thereto the clamping element (18) rests on the connecting element (15) in parallel with the bracing direction and it is thereby pressed against the connecting element with a bearing force acting perpendicularly to the bracing force, due to the moment generated by the bracing force, the bearing force bringing about a friction force between the clamping element (18) and the connecting element (15) which is the only one which reduces the bracing force on the construction element (12). For the two bracing means there are provided in each case a threaded screw (16) coaxial with the connecting element (15) and a nut (16') which comes to bear against the clamping element (18). This clamping connection (10) achieves a maximum clamping force on the construction elements (12) and, in addition, its elastic design effects bracing which is satisfactorily maintained even after a fairly long time.

Johannes Fridolin Schläpfer

Papers

Posterior spinal implant

Osteosynthetic fixation device

Clamp connection for connecting two construction components for a setting device, particularly an osteosynthetic setting device

Posterior vertebral column implant

Clamping joint for connecting two construction elements, in particular for an osteosynthetic fixator