摘要:
A device of performing osteosynthesis includes an osteosynthesis element, e.g., a bone plate, having an upper face, a lower face and an opening with a central axis linking the upper and lower faces. The opening receives a multi-axial pivotable insert for a longitudinal bone fixing element, such as a bone screw. The insert has a central passage with a longitudinal axis for housing the bone fixing element. The insert may be configured as a helical spring with an external sheath surface and an internal sheath surface that defines the central passage. When placed in the through hole, the insert is rotationally fixed relative to its longitudinal axis, but remains pivotally adjustable within the through hole relative to the osteosynthesis element.
摘要:
An expandable portion of an implant has a total volume and includes a plurality of chambers, each having a volume less than the total volume. At least one of the chambers includes a biocompatible media which is liquid at room temperature. The at least one chamber is closed, so that by increasing the temperature of the liquid, the pressure in the chamber increases.
摘要:
A method for replacing a portion of a target bone in a living body includes the steps of attaching one or more first markers to a target bone, establishing a medical three-dimensional representation of the target bone, performing a virtual resection of a resection portion, the virtual resection constructing a three-dimensional representation of the resection portion and a three-dimensional representation of the remaining target bone including cutting edges, providing a virtual pattern of the resection portion, obtaining an implant or graft portion for replacing the resection portion of the target bone by using the virtual pattern of the resection portion, resecting the resection portion from the target bone according to the virtual resection using the first reference system of coordinates and coupling the implant or graft portion to the target bone in a position substantially matching a position of the resection portion before the actual resection.
摘要:
A flexible dampening intervertebral spacer (100) to replace a spinal disc comprising upper and lower plates (101,103), an articulation element (102) and optional intermediate members (804,805). The articulation element has a plurality of interposed, concentric ring shaped segments (202) separated by one or more spaces (201) and one or more bridging elements (203) connecting the interposed segments. A first portion of the articulation element, preferably an innermost segment, is preferably fixedly connected to the upper plate while a second portion of the articulation element, preferably the outermost segment, is preferably connected to the lower plate to permit relative movement of the endplates by elastic deflection or flexing of the articulation element without opposed surfaces rubbing against each other.
摘要:
Implants and methods for osteopathic augmentation and repositioning of vertebrae may comprise a chain having one or more beads or bodies configured for insertion into a vertebral body. The one or more bodies may be expandable. As the chain is inserted into the vertebral body, it may fill a central portion thereof and can push against the inner sides of the endplates of the vertebral body, thereby providing structural support and tending to restore the vertebral body to its original height. The one or more bodies may have a first configuration dimensioned to pass through a catheter or other introducer, and may expand to a second, larger configuration after insertion into the bone in order to secure the chain within the bone.
摘要:
An implant system includes a fixation device that, in turn can include an expandable implant alone or in combination with an auxiliary implant. The expandable implant includes an expandable implant body that is made from an expandable material. The expandable material includes a polymer matrix and an expandable gas source contained within at least a portion of the polymer matrix. The implant system can further include an energy source configured to heat the polymer matrix to a temperature above its glass transition temperature, thereby causing the gas source to expand inside the polymer matrix. The fixation device can further include an insertion instrument configured to implant the fixation device into an anatomical cavity.
摘要:
A bone fixation element comprises a shaft extending longitudinally from a proximal end to a distal end and a head connected to the proximal end of the shaft. The head includes a radially outer abutting structure deformable to lockingly engage an inner wall of an opening through a bone plate. Deformation of the abutting structure permits the head to lock the bone fixation element within the opening at any user-selected angle with respect to a central axis of the opening within a permitted range of angulation.
摘要:
A bone screw (1) is used for locking an articular facet between the superior and inferior articular processes of two vertebral bodies and is provided with a threaded shaft (2), a screw head (3) and a central axis (4). The screw head (3) is further provided with a number of grooves (5) on the periphery of the screw head (3) which run essentially parallel to said central axis (4).
摘要:
The intramedullary nail has a longitudinal axis, a proximal end, a distal end, at least one hole that extends transversely to the longitudinal axis and is situated in a plane with a defined diameter to accommodate a locking element, as well as a longitudinal slot extending in the plane parallel to the longitudinal axis. In the unexpanded state of the intramedullary nail the longitudinal slot has a width b, measured perpendicularly to the plane in the region outside of the holes, said slot being maximum 0.6 times that of the smallest defined diameter of the holes.
摘要:
A method for joining two or more segments of a bone implant comprises the steps of placing a plurality of thin layers of an intermetallic material between first and second segments of the bone implant and applying a mechanical load to the plurality of layers. In a subsequent step, the plurality of layers are ignited by applying an external activation energy thereto, the ignition heating the plurality of layers to a reaction temperature and causing the segments to become affixed to one another after cooling.