58 results about "Acetabular fossa" patented technology

An acetabular reamer (10, 10′, 10″) is intended in particular for the shaping of the cotyloid cavity in the event of a replacement of a hip joint by total prosthesis. The reamer (10, 10′, 10″) is typically of a truncated hemispherical form and is adapted for attachment to a reamer spindle in order to be driven in rotation about a cutter axis (11). The ability to cut a full, continuous hemisphere to the apex (12) of the hemispherical body (14) is suppressed, so as to attain the principal advantage of the invention, namely, to adequately prepare the acetabulum for receipt of a prosthesis while minimizing the possibility of breakthrough of the fovea / acetabular fossa. The reamer (10, 10′, 10″) has an interface 16 typically made tip of cross bars (20) which a holder engages for rotationally activating the reamer for cutting.

A hip resurfacing femoral prosthesis has a partial ball component having an outer surface shaped to conform to an acetabular socket and has a mating sleeve component with an internal bore adapted to receive a femoral head. The head has been shaped and dimensioned to engage the bore and is retained by bone ingrowth, an interference fit or by bone cement. The ball component and sleeve axes may be offset to reposition the outer surface.

A hip resurfacing femoral prosthesis has a partial ball component having an outer surface shaped to conform to an acetabular socket and has a mating sleeve component with an internal bore adapted to receive a femoral head. The head has been shaped and dimensioned to engage the bore and is retained by bone ingrowth, an interference fit or by bone cement. The ball component and sleeve axes may be offset to reposition the outer surface.

The invention provides a customized acetabulum guide plate which is assembled on the acetabulum and used for guiding implantation of an acetabular prosthesis. The customized acetabulum guide plate comprises a semi-spherical cup body, two positioning arms which extend from the edge of the cup body in an upward bending mode and are arranged in a spaced mode, an abutting foot protrusively extending from the outer surface of the cup body and a guide portion upwards extending from the bottom of the cup body. The positioning arms are provided with contacting portions which abut against the surrounding portions of the acetabulum, and the abutting foot abuts against the acetabular fossa. The guide portion is provided with a longitudinally-arranged guide hole. When the acetabulum guide plate is assembled on the acetabulum, the axis where the extending direction of the guide hole is located is set through pre-operation planning and coincides with the central axis of the acetabulum. According to the customized acetabulum guide plate, by abutting the contact portions of the positioning arms against the surrounding portions of the acetabulum and abutting the abutting foot against the acetabular fossa, the customized acetabulum guide plate is stably and firmly assembled at the pre-positioned position of the acetabulum, the structure is simple, and operation is convenient.

The invention provides an acetabulum side guide plate assembly for hip joint replacement and an assembling method of the acetabulum side guide plate assembly. The acetabulum side guide plate assembly for hip joint replacement comprises a fitting guide plate, a supporting rod, a surgical instrument supporting piece and a positioning nail. The fitting guide plate comprises an attaching base, a guide rod and a positioning connecting piece, the attaching base is suitable for being attached and matched with the acetabular fossa of the human body, and the guide rod extends from the top face of the attaching base in the radial direction of the attaching base; the supporting rod is suitable for being matched with the positioning connecting piece for positioning and is suitable for being separated from the positioning connecting piece; and the positioning nail is suitable for fixing the supporting rod to the outer area of an acetabular fossa, the surgical instrument supporting piece is suitable for being fixed to the supporting rod in a matched mode, and the surgical instrument supporting piece is arranged to be capable of being matched with the supporting rod for positioning and detachably connected with the supporting rod. According to the acetabular side guide plate assembly for hip joint replacement and the assembling method of the acetabulum side guide plate assembly, it can be guaranteed that an acetabular cup prosthesis can be accurately placed, the operation precision is improved, the ideal operation effect is achieved, and the occurrence rate of postoperative complications is reduced.

A hip implant assembly including a ball and stem. An annular rim separates the ball from the stem and abuts over an exterior reconditioned surface of the femur upon inserting the stem within an interior femur passageway. A cup shaped support seats the ball in articulating fashion via a ligament which extends from the ball and is received within a recess passageway of the cup. The cup includes a mounting surface with a central projecting portion which in turn resistively fits within an undercut recess formed in the ilium bone in communication with a base surface of the reconditioned acetabulum socket. An installation kit assists the preparation of the femur and ilium bones, as well as the installation of the implant body into the conditioned femur end and the cup outer socket support to a reconditioned acetabulum defined in the ilium bone.

The invention provides an acetabular cup and an artificial hip joint. The acetabular cup comprises a hemispherical body and an extension component or a plurality of extension components. The body comprises an acetabular cup opening, and femoral heads can penetrate the acetabular cup opening; the extension components are connected onto the body in an extensible manner and can be extended towards the outer side of the acetabular cup opening. According to the technical scheme, the acetabular cup and the artificial hip joint have the advantages that extension and retraction of the extension components can be adjusted according to the acetabular fossea of the anatomical structures of different patients, the original peripheral portion of the body is in contact with the cancellous bones of the patients, and accordingly excellent bone ingrowth effects can be realized; the extension components which are extended out of the edge of the outer wall of the acetabular cup opening are in contact with the cortical bones at the outer edges of the acetabular fossea of the patients, accordingly, force can be effectively transferred to the cortical bones of the patients, stress generated between the acetabular cup and the cancellous bones can be reduced, the cancellous bones are difficult to collapse, the acetabular cup can be firmly fixed into the acetabular fossea and is excellent in stability, the problems of collapse of the cancellous bones and fixing failures of existing acetabular cups due to excessively high stress can be solved, and the service life of the artificial hip joint can be prolonged.

A patient-specific acetabular guide comprises a cup body, a plurality of alignment arms extending from the cup body and engaging periacetabular areas of a pelvis, and a supporting leg protruding from the cup body and abutting against a portion of an acetabular fossa. Each alignment arm has a fixing hole extending inclinedly therethrough to allow a Kirschner pin to pass through and enter the periacetabluar area of the pelvis for positing and orienting the acetabular guide on a predetermined location of an acetabulum.

A hip implant assembly including body exhibiting a substantially spherical shaped ball and an elongated stem. An annular defining rim separates the ball from the stem and abuts, in a maximum inserting condition, an exterior surface of a reconditioned femur upon inserting the stem within an interior passageway associated with the femur. A three dimensional and interior volume defining support secures around the ball in a universally articulating permitting fashion, the support being fixed to a reconditioned acetabulum socket associated with an ilium bone by interconnecting posts and anchors established between the fixed support and the reconditioned surface of the acetabulum. A corresponding installation kit assists the preparation of the femur and ilium bones defining the hip joint, as well as the installation of the implant body into the upper conditioned femur end and the outer socket support to a reconditioned acetabulum defined in the ilium bone.