Abstract:
A prosthetic device includes a first component and a second component. The first component of the prosthetic device includes a polymer composite configured as an articular surface and having a wear rate of less than approximately 10 -7 mm 3 /Nm. The polymer composite includes a first polymer and a second polymer. The first polymer comprises at least 10 weight percent of the polymer composite. The second component of the prosthetic device is configured to be implanted on a bone and includes a region of porosity that is customized for bone in-growth in a specific joint of a patient.
Abstract:
An intervertebral prosthetic disc (400) is disclosed and can be installed within an intervertebral space between a first vertebra and a second vertebra. The intervertebral prosthetic disc can include a first component (500) that can have a first compliant structure (520) that can be configure to engage the first vertebra. Further, the first compliant structure can at least partially conform to a shape of the first vertebra. The intervertebral prosthetic disc can also include a second component (600) that can be configured to engage the second vertebra.
Abstract:
An intervertebral prosthetic disc (400) is disclosed and can be installed within an intervertebral space between an inferior vertebra and a superior vertebra. The intervertebral prosthetic disc includes a superior component (500) that can be configured to engage the superior vertebra and an inferior component (600) that can be configured to engage the inferior vertebra. A nucleus can be disposed between the superior component and the inferior component. The nucleus (700) can be configured to allow relative motion between the superior component and the inferior component. Further, the intervertebral prosthetic disc can include at least one nucleus containment feature (530,532,630) that can be configured to prevent the nucleus from migrating with respect to the superior component and the inferior component without interfering with the relative motion between the superior component and the inferior component in any direction.
Abstract:
The invention relates to an orthopedic prosthetic device and a method of implanting such device. More particularly, the invention relates. to a knee replacement prosthesis having femoral (100), patellar (410), and tibial (10) components having surfaces for receiving bone cement and surfaces which promote bone ingrowth.
Abstract:
A canine femoral stem system provides a set of sizes of stems designed to fit in a reamed femoral bone canal with controlled interference. The canine femoral stems can be implanted using either a cemented or cementless procedures. Cementless stems have a porous coating of sintered beads on the tapered proximal section providing interference with reamed femoral canal causing friction and initial stability. The distal end of the stem has a tapered fit and contacts the lower region of the reamed femoral bone canal due to curvature of the stem providing distal stability. The porous coating encourages bone ingrowth in the cementless system or cement penetration resulting in long term stability. The cementless system uses either cast cobalt chromium stems with 250 ± 50 µm beads of cobalt chromium or Ti- 6A1- 4V stem with 250 ± 50 µm beads of chemically pure titanium.
Abstract:
A prosthetic intervertebral disc (10) containing two opposing shells (20, 40), a central body (60) disposed between the shells, and a flexible sheath (70) extending between edges of the opposing shells. The sheath provides for resisting at least one predetermined type of relative directional motion. In one embodiment, this resistance is acieved by the sheath having an anterior aspect (d1) which is greater in height than the posterior aspect (d2).
Abstract:
A minimally invasive, fluoroscopically guided system is disclosed for stabilizing the articular facet joints of adjacent vertebrae. Ring and dowel implants are disclosed for installation into the facet joint. The invention includes a novel spine surgical training aid used in the initial surgeon training process for refreshing the surgeon's perspective of the critical three dimensional anatomy of the vertebrae. The invention also includes a surgical kit having a range of size-specific drills, inserters, impactors and custom-length long k-wires matched to the internal diameter of the instrumentation system.
Abstract:
An implant and method for producing an implant are proposed. The implant forms a joint with a micro-rough bearing surface formed by sintered portion. Thus, better wear and friction properties can be achieved.
Abstract:
A plurality of canine acetabular cups designed to fit within different sized spherical reamed bone cavities to produce controlled interference without use of cements, screws or nails. Each of the canine acetabular cups, regardless of size, mates with a common femoral head, providing interchangeability. The controlled interference is obtained through use of a multiple curvature Ti-Al-V shell having a porous coating. The interference starts from zero at 50 degrees from the apex of the shell and extends to full interference value at 90 degrees from the apex. The Ti-Al-V shell carries a UHMW polyethylene insert, which is locked by interference, a non-circular post mated with an elongated opening and a circumferential locking groove mated with an interior projection. Initial stability is provided immediately after surgery due to the interference arrangement; long term stability is afforded by bone ingrowth.
Abstract:
The device (10) includes a disc prothesis or artificial disc (12) having an upper plate (14) and a lower plate (16) . It is understood that the disc is an articulating joint, configured for disposition within an intervertebral space between adjacent berterbral bodies in a human spine, that maintains or restores motion by providing relative bending and rotational motion between the vertebral bodies. A convex-shaped projection (26) extends from the lower plate and engages an articular surface defined by a concave recess (28) formed in the upper plate. A flexible construct (30) extends vertically from the upper plate to the lower plate. The construct is sized so that it is relaxed and not undergoing tension when the disc is in its neutral position. After the upper plate pivots to a certain predermined degree, the construct is tensioned so that it begins to resist or restrict this bending.