51 results about "Replacement implant" patented technology

Improved nucleus pulposus implants are provided to better accommodate the disc nucleus space, to provide a modified compressive modulus, to facilitate positioning, to enhance fixation, and to facilitate effective implantation and use. Some implants have sloped upper and/or lower surfaces to provide a “wedge-shaped” implant, while other implants have circumferential grooves, and/or have radiographic markers, and/or are modified by including a material having a compression profile that differs from the compression profile of the predominant material of the implant. Some implants have surface features to enhance fixation to surrounding surfaces.

The invention consists of disc replacement implant for the lumbar spine designed for insertion into the disc space via a posterior approach. The implant can be stabilized in the disc space by connection to the vertebra or can be connected to dynamic spinal stabilization device consisting of interconnected bullets nested in a spring nested in a woven sleeve. By controlling the limits of elongation and compression the device prevents movement beyond normal physiological limits. In the midrange of movement flexibility is allowed. A method for using the dynamic spinal stabilization device is also provided.

Arrangement for the intra-operative determination of the spatial position and angular position of a joint replacement implant, especially a hip socket or shoulder socket or an associated stem implant, or a vertebral replacement implant, especially a lumbar or cervical vertebral implant, using a computer tomography method, having: a computer tomography modeling device for generating and storing a three-dimensional image of a joint region or vertebral region to be provided with the joint replacement implant, an optical coordinate-measuring arrangement for providing real position coordinates of defined real or virtual points of the joint region or vertebral region and/or position reference vectors between such points within the joint region or vertebral region or from those points to joint-function-relevant points on an extremity outside the joint region or vertebral region, the coordinate-measuring arrangement comprising a stereocamera or stereocamera arrangement for the spatial recording of transducer signals, at least one multipoint transducer, which comprises a group of measurement points rigidly connected to one another, and an evaluation unit for evaluating sets of measurement point coordinates supplied by the multipoint transducer(s) and recorded by the stereocamera, and a matching-processing unit for real position matching of the image to the actual current spatial position of the joint region or vertebral region with reference to the real position coordinates of the defined points, the matching-processing unit being configured for calculating transformation parameters with minimalization of the normal spacings.

A method for making a dental implant by obtaining images of the tooth pre-atraumatic tooth extraction and post extraction and using those images to computer generate and mill a titanium replacement implant employing CAD/CAM equipment. The implant includes a scalloped neck interface similar to the replaced tooth's scalloped cementoenamel junction, a polished neck area between a root portion and a crown portion, and the numeral for the tooth number imprinted on the implant's facial surface. Chevron retention fins are provided on the root portion for engaging the bone of the tooth socket or osteotomy when the implant is tapped into position. Retention grooves are provided on the crown portion to which a provisional crown is cemented slightly out of occlusion at the time the implant is placed. The provisional crown will be replaced with a permanent crown after osteointegration of the implant has occurred.

An intervertebral prosthesis implantable within a disc space and disposed between upper and lower vertebral endplates is provided. The prosthesis comprises a plurality of prosthesis modules insertable into the disc space, wherein the modules have at least one set of complementarily-shaped and sized surfaces, and wherein at least one of the modules is expandable. The modules have surfaces configured to engage within the disc space in a manner such that the modules form an assembled prosthesis of a size substantially preventing it from being outwardly expelled from the disc space, and the modules have bearing surfaces slidably engageable with the endplates to permit articulation between upper and lower vertebral endplates. In one embodiment, the at least one expandable module of the intervertebral prosthesis expands by inflation. In another embodiment, the at least one expandable module expands by unfolding into its intended form.

To improve a cartilage replacement implant for the biological regeneration of a damaged cartilage area of articular cartilage in the human body, comprising a cell carrier which has a defect-contacting surface for placement on the damaged cartilage area and is formed and designed for colonization with human cells, so that after implantation of the cartilage replacement implant, formation of a gap between adjacent contact surfaces of the implant and surrounding recipient tissue is minimized, it is proposed that the cell carrier rest with surface-to-surface contact on a carrier and be joined to the carrier at a cell carrier surface that faces away from the defect-contacting surface. A method for producing a cartilage replacement implant is also proposed.

Devices and methods are provided for replacing a spinal disc, and in particular devices and methods are provided that rely on buckling to control movement of adjacent vertebrae. In one embodiment, an artificial disc replacement implant is provided and includes an implantable body having a superior surface adapted to be positioned adjacent to an endplate of a superior vertebra, and an opposite inferior surface adapted to be positioned adjacent to an endplate of an adjacent inferior vertebrae. The implantable body includes at least one wall formed therein and extending between the superior and inferior surfaces. The wall(s) can be adapted such that, when the implantable body is disposed between the endplates of adjacent superior and inferior vertebrae, the wall(s) will buckle by moving laterally and shorting in height under a load applied thereto by movement of the adjacent vertebrae. The implantable body can also include at least one opening formed adjacent to the wall(s) and extending between the superior and inferior surfaces of the implantable body.

The invention provides high molecular weight, crystalline or semi crystalline biodegradable and biocompatible poly(ester urea) (PEU) polymers useful for making vascular stents and hard tissue replacement implants, such as bone substitutes. The PEU polymers are based on α amino acids and are made by a polycondensation reaction. PEU polymer compositions can contain a therapeutic diol incorporated into the polymer backbone that is released from such an implant in situ. Bioactive agents, such as analgesics, antibiotics, and the like, can also be covalently attached to certain PEU polymers for release into tissue surrounding an implant during biodegradation of the polymer.

A vertebral replacement implant includes two longitudinal elements slidably mounted with respect to each other, and locking elements. These locking elements include, on one of the longitudinal elements, an anchor surface, and on the other of the longitudinal elements, an anchor shoe guided in translation to take up a first position in which the elements slide freely with respect to each other, and a second position in which the anchor shoe cooperates with the anchor surface to lock the elements together, with a system converting a rotational movement into a translational movement transmitted to the anchor shoe.

A multi-piece disc replacement implant for replacing a disc removed by a discectomy including an upper plate member, a lower plate member, and an intermediate resilient member providing movement between te two plate members replicating the natural movement of the spine. The plate members are rigid and have orthogonal sidewalls forming an enclosure. The resilient member is an elastic solid or a multi-chamber balloon structure of fluid-filled sacks that collectively define a non-uniform shape such as an oblate spheroid, or a helically coiled string of beads. Such an implant is capable of supporting the compressive and cyclic loads required of a natural disc. The upper and lower plate members are cooperatively formed to selectively limit the allowable range of motion in any given direction and a provided with protrusions to be received in one or more channels cooperatively formed in the vertebrae and secured in place by a bone screw.

Provided is a novel hip replacement implant system that includes a ball assembly having a ball trunion, the ball assembly being configured as a replacement for the head of the femur and capable of being secured by the ball assembly trunion to a calcar implant element that can be securely seated in the calcar bone of the femoral neck, thus maintaining the load transfer function of the calcar bone of the femoral neck. A method of using the device is also provided.

Methods and devices are provided for replacing a nucleus of a spinal disc, and in particular for preventing nucleus disc replacement expulsion. The nucleus of a spinal disc can be removed from the annulus by forming a small opening in the annulus. Once the nucleus is removed, one or more insert devices can be implanted within the annulus of a spinal disc and they can be mated to one or both endplates of the adjacent vertebrae. The insert(s) is configured to interact with a nucleus disc replacement implant to prevent expulsion of the implant from the annulus.