315 results about "Osteosynthesis" patented technology

A bone fixing device, in particular for fixing to the sacrum for osteosynthesis of the backbone, comprises elongate link means receiving at least one bone-fastening screw, which passes through an orifice formed in the link means. In the bottom of the link means there is included a bearing surface of essentially circular cross-section. The head of the screw includes an essentially spherical surface for bearing against said bearing surface. The link means include a first thread in the vicinity of said orifice. The device further includes a plug having a second thread suitable for co-operating with the first thread, the plug being suitable for coming into clamping contact against said screw head to hold it in a desired angular position. According to the invention, the link means are constituted by a single-piece plate-shaped element having the orifice and the first thread formed therein, and said bearing surface is essentially spherical.

PCT No. PCT / FR97 / 01617 Sec. 371 Date Jul. 28, 1998 Sec. 102(e) Date Jul. 28, 1998 PCT Filed Sep. 12, 1997 PCT Pub. No. WO98 / 10722 PCT Pub. Date Mar. 19, 1998An expandable osteosynthesis implant has branches (5) each connected at one end to a seat (7) which is pierced by an orifice (8), suitable for being slid from a posterior direction between the facing faces of two consecutive vertebrae in order to hold them a given distance apart and restore stability of the spinal column. According to the invention, the branches (5) and the seat (7) define a hollow cage (1) which, in a "rest" position, has an outside general shape that is a cylinder of circular section, and a portion at least of the inside volume (9) of the cage (1) towards the distal ends of the branches (5) is in the form of a circular truncated cone whose large base is towards the seat (7), which implant has at least three branches (5) and, inside the inside volume (9) at least one spacer (2) suitable for passing through the orifice (8) and the large base of the truncated cone.

An expandable osteosynthesis implant has branches (5) each connected at one end to a seat (7) which is pierced by an orifice (8), suitable for being slid from a posterior direction between the facing faces of two consecutive vertebrae in order to hold them a given distance apart and restore stability of the spinal column. According to the invention, the branches (5) and the seat (7) define a hollow cage (1) which, in a "rest" position, has an outside general shape that is a cylinder of circular section, and a portion at least of the inside volume (9) of the cage (1) towards the distal ends of the branches (5) is in the form of a circular truncated cone whose large base is towards the seat (7), which implant has at least three branches (5) and, inside the inside volume (9) at least one spacer (2) suitable for passing through the orifice (8) and the large base of the truncated cone.

In the osteosynthesis device of the invention, the elastically deformable connection system comprises: a deformable connection member presenting: in a "sagittal" plane, determined stiffness for exerting a return force on flexion-extension movements between the fixing portions; in a "frontal" plane perpendicular to the sagittal plane, determined stiffness for exerting a return force on lateral inflexion movements between the fixing portions, the stiffness of the deformable connection member in the frontal plane being less than its stiffness in the sagittal plane; and along an axis defined by the intersection between the sagittal and frontal planes, determined stiffness for exerting a return force on traction-compression movements between the fixing portions; and means for limiting flexion-extension, traction-compression, and lateral inflexion movements between the fixing portions.

A clamp designed for use in the heart-surgery field for osteosynthesis following on sternotomy has a roughly C-shaped configuration with a core (11) terminating at opposite ends with hooks (12) set opposite to one another. In the centre, the said core (11) extends vertically according to a plane which is substantially perpendicular to the one on which the end hooks (12) lie, with a loop (13) which is elastically compliant. The said clamp is made of a so-called “shape-memory” metallic alloy, i.e., an alloy which is malleable at a low temperature and which re-acquires its original form at body temperature, exerting a semi-rigid compression on the ends or edges of the bones requiring synthesis.

An axial intramedullary screw having a straight cylindrical outer surface for the operative treatment of long bones, the screw having two tips and a screw thread extending between the tips. At each of the tips there is a connection portion for screwdriver. The screw thread is used for cutting into the cortical bone of the medullary canal and due to the screwdriver connection at both ends it can be driven from either end through the cortical bone. This allows a method to be used in which the screw is threaded into one portion of a bone fragment and then after connecting a further bone fragment at the fracture site, screwed in a different direction into that further fragment. The screw also includes a transverse screw hole at one or both ends for the passage of an interlocking transverse screw therethrough.

A multiaxial connection osteosynthesis system for the spine having a bone anchor, a connector and a connecting member. The bone anchor may be implanted into a vertebral body with a connector being attached to a head of the bone anchor. The connector includes a seat for receiving the connecting member. As the connecting member is locked into position it causes walls of the connector to inwardly deform and lock the head of the bone anchor relative to the connector.

A system for mandibular reconstruction generally includes an elongated locking plate having a plurality of internally threaded apertures and a plurality of fasteners. Each fastener includes a main body portion having an upper threaded shaft and a lower threaded shaft. The lower threaded shaft is adapted to engage the mandible. Each fastener further includes a removable head portion internally threaded for engaging the upper shaft portion and externally threaded for engaging a selected one of the internally threaded apertures of the locking plate. In the preferred embodiment, the thread leads of the head portion and lower shaft of the main body portion are identical. A method of mandibular osteosynthesis utilizes the system of osteosynthesis and generally comprises the steps of temporarily securing the elongated locking plate to the mandible with at least one fastener by engaging the threads of the lower portion with the mandible and threadably engaging the head with the locking plate, unthreading the head portion from the main body of the fastener to thereby allow displacement of the locking plate from the mandible without removing the fasteners from the mandible, performing a surgical procedure (e.g., removal of a cancerous growth), and re-securing the elongated plate to the fastener with the removable head portion.

An implant for the purpose of osteosynthesis, for the immobilization and stabilization of tubular bones, especially of tubular bones that have a fracture or an osteotomy, especially of rib bones, comprises at least a first implant component that has an attachment section with means of attachment for the purpose of attaching the first implant component to a tubular bone, especially in a region of the tubular bone close to a fracture or osteotomy. The first implant component further has a connection section, with the connection section being formed for insertion of a second implant component and immobilization of the second implant component in a position adjustable relative to the first implant component. The connection section comprises a guide device for the purpose of guiding the second implant component as the second implant component is being positioned relative to the first implant component. The guide device permits movement of the second implant component relative to the first implant component only in one direction relative to a longitudinal axis of the connection section. A third implant component, which matches the first implant component in functionality, is attached to the other end of the second implant component.

A system for mandibular reconstruction generally includes an elongated locking plate having a plurality of internally threaded apertures and a plurality of fasteners. Each fastener includes a main body portion having an upper threaded shaft and a lower threaded shaft. The lower threaded shaft is adapted to engage the mandible. Each fastener further includes a removable head portion internally threaded for engaging the upper shaft portion and externally threaded for engaging a selected one of the internally threaded apertures of the locking plate. In the preferred embodiment, the thread leads of the head portion and lower shaft of the main body portion are identical. A method of mandibular osteosynthesis utilizes the system of osteosynthesis and generally comprises the steps of temporarily securing the elongated locking plate to the mandible with at least one fastener by engaging the threads of the lower portion with the mandible and threadably engaging the head with the locking plate, unthreading the head portion from the main body of the fastener to thereby allow displacement of the locking plate from the mandible without removing the fasteners from the mandible, performing a surgical procedure (e.g., removal of a cancerous growth), and re-securing the elongated plate to the fastener with the removable head portion.

The invention concerns a backbone osteosynthesis system comprising an elongated element, a vertebral screw, and a connecting element comprising two branches for clamping between them the linking element, at least one first branch being capable of being engaged onto the screw. The system comprises a second vertebral screw, the first branch having an extension capable of being engaged onto the second screw. The system may comprise a second elongated linking element.

A connecting device for spinal osteosynthesis has an osseous anchoring device, a connector that accommodates a joining shaft and is fixed to one end of the anchoring device, and a tightening device for immobilizing the joining shaft. The connecting device is characterized in that the connector is fixed to the anchoring device with the aid of a pin that penetrates the anchoring device and embodies a pivot joint. Furthermore, the device comprises an arrangement for stabilizing the connector relative to the anchoring device when the device is implanted in the patient, the stabilizing arrangement being located on the plane encompassing the shaft and the anchoring device.

A anti-splay and rod securing member for use with vertebral implants of the hook, monoaxial and polyaxial types, in which a pair of arcuate upstanding internally threaded posts define a transverse opening for securing a rod to immobilize bone segments comprises an integrally formed cap and set screw with the cap having opposed curved side walls extending around the posts and flat end walls, the set screw being positioned within the posts and free to rotate within the cap so that rotation of the set screw will advance the cap and set screw in unison along the implant posts to clamp the rod and implant together. The implant may be provided with opposed catch basins for releasably securing the distal end of a rod persuasion instrument.

A spinal osteosynthesis device comprising a bone anchorage element, a vertebral rod, a connector for interconnecting the rod and the anchorage element so that the anchorage element is capable of being angularly oriented in a polyaxial manner relative to the rod. A fixation element is provided for fixing the position of the connector in translation and in rotation relative to the rod. A clamp element is provided for clamping the bone anchorage element to the connector in a predetermined angular position independent of the fixation element.

This invention relates to a spinal osteosynthesis assembly comprising the head of an anchoring member consisting of at least one arm and a tool for fixing said head to a spinal osteosynthesis system. The inventive assembly is characterized in that the tool can hold the head by creating at least one lateral support on at least one lateral edge of the arm and an additional support on the head in the opposite direction of the lateral support.

A system for connecting a spinal osteosynthesis rod and a crossbar include a passage for receiving the corssbar and hinge mounted jaws for clamping the rod. A locking device biases the crossbar against the jaws. A return spring pulls the jaws relatively close to one another independently of the crossbar such that the jaws may clamp the osteosynthesis rod to ensure a stable mounting of the connection system to the osteosynthesis rod.

Intramedullary osteosynthesis implant, permitting in particular arthrodesis (1) of a joint, for example an interphalangeal joint, or diaphyseal osteosynthesis of the upper limb or of the lower limb, comprising two sets of at least two rods (2, 3, 4, 5) each extending on either side of a central zone (6), said rods (2, 3; 4, 5) being substantially parallel at ambient temperature within the same set, each set of rods being intended to be impacted in the medullary canal of a diaphysis, said implant being made from a shape-memory material so that, at body temperature, the rods (2, 3; 4, 5) of the same set spread apart so as to be able to immobilize themselves in said medullary canal.

A system for connecting a spinal osteosynthesis rod and a crossbar include a passage for receiving the crossbar and hinge mounted jaws for clamping the rod. A locking device biases the crossbar against the jaws. A return spring pulls the jaws relatively close to one another independently of the crossbar such that the jaws may clamp the osteosynthesis rod to ensure a stable mounting of the connection system to the osteosynthesis rod.

To be able to secure a bone screw, in particular one that can be aligned polyaxially, especially fixedly and nevertheless easily and detachably in an osteosynthesis plate or a comparable implant, a clamping bore is proposed in addition to a receiving bore, whereby the receiving bore holds a bone screw directly or indirectly, and the clamping bore runs essentially perpendicular to the osteosynthesis plate or parallel to the receiving bore, and with a recess in the area of the bores, preferably between the bores, being arranged in relation to the receiving bore in such a way that widening of the clamping bore results in a constriction of the receiving bore.

The invention concerns a backbone osteosynthesis system, in particular for anterior fixing comprising: an elongated linking element; a vertebral screw with a threaded head; a connector comprising two branches capable of being engaged onto the screw and clamping between them the linking element; and a threaded clamping member capable of co-operating with the head for clamping the branches. The head has a threaded orifice, the clamping member comprising a threaded rod capable of being urged to be engaged in the orifice.

The self-locking osteosynthesis device includes a plate equipped with holes for the passage of fixation screws. The invention is characterised in that, at least in the areas defining the screw holes, the aforementioned plate is made from a material having mechanical properties such that the periphery of the holes can be self-tapped by means of tapping screws which can be used to fix the plate.

An apparatus for osteosynthesis of a mandible. An elongated plate has a plurality of apertures. The plate has a first portion, a second portion, and a central portion intermediate the first and second portions. Each of the apertures within the first portion and within the second portion are disposed in relatively close spaced relationship, and each of the apertures within the central portion are disposed in relatively widely spaced relationship. The width of the plate between apertures is less in the central portion than in the first portion. The plate is more easily bent within the central portion than within the first portion, and can be bent to a relatively small radius in the central portion without distorting the apertures within the central portion. The central portion is sized and located to overlie the symphysis of the mandible.

A system for mandibular reconstruction generally includes an elongated locking plate having a plurality of internally threaded apertures and a plurality of fasteners. Each fastener includes a main body portion having an upper threaded shaft and a lower threaded shaft. The lower threaded shaft is adapted to engage the mandible. Each fastener further includes a removable head portion internally threaded for engaging the upper shaft portion and externally threaded for engaging a selected one of the internally threaded apertures of the locking plate. In the preferred embodiment, the thread leads of the head portion and lower shaft of the main body portion are identical. A method of mandibular osteosynthesis utilizes the system of osteosynthesis and generally comprises the steps of temporarily securing the elongated locking plate to the mandible with at least one fastener by engaging the threads of the lower portion with the mandible and threadably engaging the head with the locking plate, unthreading the head portion from the main body of the fastener to thereby allow displacement of the locking plate from the mandible without removing the fasteners from the mandible, performing a surgical procedure (e.g., removal of a cancerous growth), and re-securing the elongated plate to the fastener with the removable head portion.

The invention concerns an osteosynthesis system, comprising at least a linking element in the form of a rod, at least two fixing elements each capable of being anchored in a vertebra, and a locking screw. The invention is characterized in that the base of the head has a general horse-saddle shape, and the head has guide means for an independent closure component designed to be fixed on the head after the linking element has been positioned in the fork of the head, said closure component being generally U-shaped whereof the branches are urged to co-operate with the branches of-the fork-shaped part of the head and whereof the base comprises an internal thread for co-operating with the locking screw and the guide means provided on the head is formed by an arc-shaped shoulder on the outer side surfaces of the fork-shaped part. The invention also concerns an ancillary and an element for fixing such a system.

A clamping nut suitable for co-operating with a threaded shank of an osteosynthesis appliance, the nut including an annular body and a tapped bore for cooperating with the threaded shank. The annular body is provided with a structure which enables turning the body and with a transverse bearing face. The osteosynthesis nut further includes a ring mounted in a housing of the annular body which is provided internally with the tapped bore, and which cooperates externally with the annular body.