摘要:
A spinal fixation device that includes a first engagement member. The first engagement member includes a first body and at least one extension. The first body includes a first aperture for receipt of a fastener. The at least one extension extends outwardly from the first body. Also included in the device, a second engagement member including a second body and a threaded extension that extends from the second body. The second body includes a second aperture for receipt of a fastener. Further, an expansion ring including a first end and a second end is included. The first end includes a threaded surface in threaded communication with the threaded extension. The second end is in rotatable communication with the at least one extension of the first engagement member. Where a torque is applied to the expansion ring, the second engagement member moves with respect to the first engagement member.
摘要:
An implant has a bone plate with a bone contacting surface and an opposite outwardly facing surface. The plate includes a split-ring receiving recess open to the outwardly facing surface located intermediate first and second bone screw receiving openings in the plate. The first and second bone screw receiving openings each having a slot spaced from the outwardly facing surface towards the bone contacting surface. The slot is formed in a wall of the first and second bone screw receiving openings. The slot is open to the split ring receiving recess. A resilient split-ring has a thickness less than a height of the slots in the first and second bone screw openings when measured along the bone screw receiving opening axis. The split-ring having a contracted position wherein its maximum dimension is less than a maximum dimension of the split-ring receiving recess and an expanded position wherein an outer circumference of the split-ring extends through the slots and into the first and second bone screw receiving openings.
摘要:
A spinal implant apparatus that is an expandable spacer including features to minimize or eliminate spacer cant or offset during and after completing the expansion process. The spacer includes a top component, a base component in engagement with the top component, and an expansion mechanism arranged to change the top component's position with respect to the base component. The mechanism for causing expansion may be a screw, a cam, a wedge or other form of distracting device. In one embodiment, the expandable spacer includes a base component with a set of towers and a top component with a set of corresponding silos, where the towers and silos are configured to minimize or eliminate tilt of the top component as it extends upwardly from the base component. In another embodiment, the spacer may include a stepped arrangement around the perimeter of the top component and the base component for engagement during height expansion with minimal canting or slippage. In another embodiment, the spacer may include texturing modification at the opposite ends of the longitudinal axis of the spacer to prevent tilting, slipping, or canting. Additionally, a portion of one or more exterior surfaces of the spacer may be textured, sawtoothed, dovetailed or the like to increase frictional intervertebral contact. The spacer may contain one or more passageways of selectable shape/dimension for bone growth through the spacer.
摘要:
Pedicle screws are designed to provide polyaxial coupling to pedicles of a vertebra. Intermediate pieces are attached to the pedicles screws and receive extender shafts. Extenders are inserted in the intermediate piece. The extenders project the anatomic points located in the cage outside the patient's body to facilitate proper contouring of a rod. An alignment linkage is used to ensure that the extenders are parallel to each other. The alignment linkage includes a linkage frame, an articulating linkage and a locking member. The articulating linkage has all rotational degrees of freedom and thereby adapts to any varying trajectories of the extenders and distance between the extenders. The alignment linkage includes a locking member with a pop-up indicator. The pop-up indicator notifies the users when the locking member is tightened with two of the extenders in non-parallel configuration.
摘要:
Anatomic points within the body are projected outside the body through the use of extenders (180, 182, 188). The projected points may then be used for measurement, or to facilitate the selection or configuration of an implant that is positioned proximate the anatomic points using a slotted cannula (143). Such an implant may be a rod (270) for a posterior spinal fusion system. Pedicle screws (140, 142, 148) may be implanted into pedicles of the spine, and may then serve as anchors for the extenders. The extenders (180, 182, 188) may have rod interfaces (214, 216, 218) that receive the rod (270) in a manner that mimics the geometry of the pedicle screws (140, 142, 148) so that the selected or configured contoured rod (270) will properly fit into engagement with the pedicle screws (140, 142, 148).
摘要:
An insertion tool for positioning intervertebral spacers into disc spaces. The insertion tool has a proximal end and a distal end, a T-handle secured to the proximal end and a pair of alignment rails extending to the distal end. The insertion tool includes a handle secured to the proximal end of the guide rails, and a shaft that extends through the handle, whereby the shaft has a threaded portion that extends to the T-handle. The insertion tool also includes a blocker that is secured to the distal end of the shaft. The blocker includes stop arms that guide the blocker through the guide rails and toward the distal end of the shaft. The blocker may be provided in a plurality of different sizes corresponding to the sizes of the implants to be inserted into a disc space. A lock is provided for locking the implant to the shaft.
摘要:
A device for use as a portal in percutaneous minimally invasive surgery performed within a patient's body cavity includes a first elongated hollow tube having a length adjusted with a self-contained mechanism. The first elongated tube includes an inner hollow tube and an outer hollow tube and the inner tube is adapted to slide within the outer tube thereby providing the self-contained length adjusting mechanism. This length-adjustment feature is advantageous for percutaneous access surgery in any body cavity. Two or more elongated tubes with adjustable lengths can be placed into two or more adjacent body cavities, respectively. Paths are opened within the tissue areas between the two or more body cavities, and are used to transfer devices and tools between the adjacent body cavities. This system of two or more elongated tubes with adjustable lengths is particularly advantageous in percutaneous minimally invasive spinal surgeries, and provides the benefits of minimizing long incisions, recovery time and post-operative complications.
摘要:
An intervertebral stabilization device and method is disclosed. The device preferably includes a planar spring enclosed within a housing. The housing is joined to an articulation component at either end, and the articulation components have couplings connectable to anchoring components which are securable to adjacent vertebrae. The planar spring can flex and retract providing relative motion between the adjacent vertebrae. The articulation components are ball and socket joints which allow the entire assembly to flexibly follow the curvature of the spine. A fusion rod with articulation components and couplings at either end may be substituted for the spring device. The couplings enable interchangeability between a fusion rod assembly and spring assembly, so that dynamic stabilization can occur at one vertebral level and fusion at the adjacent vertebral level. An overhung spring assembly with a sideways displaced housing which allows for a shorter pedicle to pedicle displacement is also disclosed.
摘要:
A method of dilating an incision to provide access to a surgical site. Such method may include the steps of making an incision in the skin of a patient near a predetermined surgical site, inserting into the incision a dilator, inserting at least one shoe horn in juxtaposition or in direct apposition with the dilator, removing the dilator from the incision, inserting a blunt dissector adjacent the at least one shoe horn, removing the at least one shoe horn, inserting a retractor or a tube over the blunt dissector and into the incision such that the retractor or tube is at or adjacent the predetermined surgical site, removing the blunt dissector from the incision, and performing a surgical procedure at the predetermined surgical site through the retractor or tube.
摘要:
A prosthetic intervertebral spacer is disclosed. The spacer preferably includes a body and an interface extending away from the body for use during implantation of the spacer. Methods of implanting the spacer and tools used during such procedure are also disclosed.