摘要:
L'implant d'interposition trapézien (1) selon l'invention comporte un corps (2) présentant une surface articulaire métacarpienne et une surface articulaire scaphoïdienne. Ces deux surfaces sont situées de part et d'autre d'un plan médian du corps, sont reliées l'une à l'autre par une surface périphérique (8) du corps, dans laquelle est ménagée une gorge périphérique (81) de réception glissante d'un ligament (L) ceinturant partiellement le corps, et correspondent chacune à un segment axial de cylindre, de cône ou de tore, ces deux segments axiaux de cylindre, de cône et/ou de tore étant centrés sur des axes respectifs (X 4 , X 6 ) qui, projetés sur le plan médian, sont sensiblement perpendiculaires l'un à l'autre. Cet implant présente les avantages de pouvoir être mis en place de manière pérenne et facile, ainsi que de fournir une mobilité articulaire proche de la mobilité naturelle de l'os du trapèze, tout en préservant la colonne du pouce.
摘要:
The invention relates to a surgical implant that provides an artificial diarthroidal-like joint, suitable for use in replacing any joint, but particularly suitable for use as an intervertebal disc endorprosthesis. The invention contains two rigid opposing shells, each having an outer surface adapted to engage the surfaces of the bones of a joint in such a way that the shells are immobilized by friction between their outer surfaces and the surfaces of the bone. These outer surfaces are sufficiently rough that large frictional forces strongly resist any slippage between the outer surface and the bone surfaces in the joint. They may be convex, and when inserted into a milled concavity, are immediately mechanically stable. Desirably, the outer surfaces of the shells are adapted to allow for bony ingrowth, which further stablizes the shells in place. The inner surfaces of the shells are relatively smooth, and adapted to slide easily across a portion of the outer surface of a central body disposed between the shells. The central body has a shape that cooperates with the shape of the inner surface of the shell so as to provide a range of motion similar to that provided by a healthy joint. A flexible sheath extends between edges of the opposing shells. The inner surface of this sheath, together with the inner surfaces of the rigid shells, defines a cavity encasing the central body. At least a portion of this cavity is filled with a fluid lubricant, further decreasing the frictional force between inner surfaces of the shell and the surface of the central body.
摘要:
A buffer (10) for placement in a human knee between the femur and tibia comprises an outer sack (14) formed of a pliable material and having a one-way valve (22), a generally circularly shaped inner ring (16) received within the outer sack (14), and a friction reducing fluid (18) received within the outer sack (14) via the one-way valve (22). The inner ring (16) includes top and bottom surfaces (38,40) angled inwardly with respect to each other, such that the ring (16) is generally concave. The buffer (10) is configured for insertion between the femur and tibia so as to at least partially prevent the bones from contacting each other, which reduces the pain and discomfort associated with a loss of articular cartilage (12). The buffer (10) is arthroscopically inserted in the knee using an especially designed sleeve (20) configured for support of the buffer (10) during insertion.
摘要:
A surgically implantable device having at least one first part made from a shape-memory alloy; and at least a second part made from a polymer material, wherein the device is designed for surgical replacement of cartilage in a mammalian joint.
摘要:
A device for compressing cancellous bone within a vertebral body is described. The device comprises an elongated expandable body (300) having an elongated axis. The expandable body includes an internal membrane that directs expansion of the body to expand into an irregular shape that, when expanded, comprises a first region having a first expanded diameter, a second region having a second expanded diameter and a third region having a third expanded diameter. The first and third expanded diameters are greater than the second expanded diameter and the first and third regions are separated by the second region.
摘要:
A system for supporting and strengthening a damaged bone that includes inner cancellous bone and outer cortical bone is described. The system comprises a cannula that is adapted to establish an access path to inside bone,a hollow balloon body comprising a flexible, non-elastic material that is capable of inflation from a collapsed configuration, when it is adapted for passage through the cannula into bone, to an expanded configuration. The balloon body has a predetermined size in the expanded configuration that is selected to compress at least a portion of the inner cancellous bone into the outer cortical bone to strengthen the outer cortical bone. The non-elastic material of the balloon body is capable of supporting the outer cortical bone when the balloon body is in the expanded configuration and the balloon body defines an inner passage for allowing an inflating fluid to pass into the body. The system also comprises means for scaling the inner passage of the balloon body when the balloon is in the expanded configuration to provide a support structure for the outer cortical bonc.
摘要:
An encapsulation device (5) for repair of articular cartilage defects includes a body for disposition adjacent a bone in an area of the cartilage defect (55), and elongated leg structure (25) extending from the body and for disposition in the bone in the area of the cartilage defect. The leg structure is provided with a length which is a plurality of magnitudes greater than a thickness of the body, and is of a generally conical configuration.
摘要:
A system for supporting and strengthening a damaged bone that includes inner cancellous bone and outer cortical bone is described. The system comprises a cannula that is adapted to establish an access path to inside bone,a hollow balloon body comprising a flexible, non-elastic material that is capable of inflation from a collapsed configuration, when it is adapted for passage through the cannula into bone, to an expanded configuration. The balloon body has a predetermined size in the expanded configuration that is selected to compress at least a portion of the inner cancellous bone into the outer cortical bone to strengthen the outer cortical bone. The non-elastic material of the balloon body is capable of supporting the outer cortical bone when the balloon body is in the expanded configuration and the balloon body defines an inner passage for allowing an inflating fluid to pass into the body. The system also comprises means for scaling the inner passage of the balloon body when the balloon is in the expanded configuration to provide a support structure for the outer cortical bonc.
摘要:
Eine Bandscheibenprothese weist eine kraniale Scheibe (10) und eine kaudale Scheibe (12) auf, die durch Federmittel (16) druckelastisch gegeneinander abgestützt sind. Die Federmittel (16) bestehen aus einer Memory-Metalllegierung, die bei Körpertemperatur superelastische Eigenschaften aufweist.