Abstract: The presented disclosure is a prosthesis for performing radial head replacement in the setting of fractures or degenerative conditions of the radial head, and other conditions including avascular necrosis. The presented radial head replacement prostheses can be implanted in a cement-less or cemented fashion. The prosthesis of the presented disclosure comprises a radial head replacement which in various embodiments includes (1) one or more interlocking screw holes along the stem, (2) a radial head replacement prosthesis with a two component design and with a tapered connection, (3) a radial head replacement prosthesis with a two component design and with a cylindrical connection, (4) a radial head replacement prosthesis with a two component design and with a curved stem, (5) a radial head replacement prosthesis with a two component design and with an inter-component screw connection, and (6) a radial head replacement prosthesis with a one-piece design.

Abstract: The presented invention is a reusable multi-chamber coin container with means for storage and transport of coin-based currency or coin-shaped objects and is comprised of two symmetrical interchangeable halves which, when assembled with two halves in an opposing orientation, contain a plurality of chambers to accommodate multiple stacks of coins or stacks of coin-shaped objects. When assembled, the multi-chamber coin container allows for ease of storage of coin-based currency or coin-shaped items and is reusable.

Abstract: The presented invention is a system for performing reverse ankle replacement in the setting of ankle joint osteoarthritis, and other degenerative conditions of the ankle joint including avascular necrosis. The presented tibial and talar components can be implanted in a cement-less or cemented fashion. The prosthesis of the presented invention consists of (1) a tibial component which includes a planar undersurface with porous texture applied to its upper, non-bearing surfaces, (2) a talar component which includes a bearing surface which is concave, (3) a polyethylene component which includes a bearing undersurface which is convex, and (4) multiple talar component embodiments with or without flanges and/or screw holes for accommodation of bone screws for additional fixation and for permitting sub-talar joint fusion.

Abstract: A patella resurfacing prosthesis may include a patella resurfacing implant. The patella resurfacing prosthesis may include one or more threaded holes along a front aspect of the patella resurfacing implant, wherein the one or more threaded holes along the front aspect of the patella resurfacing implant may be configured to fixate the patella resurfacing implant to a patella of a user.

Abstract: A scalable modular hip resurfacing arthroplasty system includes (1) an alignment guide for precise guide pin insertion, (2) a modular cannulated cylindrical reamer assembly for accurate femoral head cylindrical reaming and central bone channel drilling, (3) a saw guide for an accurate femoral head osteotomy, (4) a soft tissue protector with a stepped design to shield and retract tissues, (5) a hip retractor that seats onto a prepared femur, (6) an outer hole drill guide aiding drilling of peripheral holes, and (7) a femoral resurfacing implant with a cap portion and central stem adapted for multiple modular attachments including plates. A method for preparing the proximal femur for hip resurfacing with novel stepped cylindrical femoral head osteotomy and central bone channel drilling, leaving an intact collar of cortical bone above the femoral head articular rim.

Abstract: A variable hip resurfacing implant which allows for varying configuration options to account for characteristics of underlying degenerative hip joint disease and for both un-cemented and cemented application. The variable hip resurfacing implant generally includes a femoral head portion, bearing surface, outer rim, inner planar surface, central stem, and a central stem threaded hole.

Abstract: A scalable modular hip resurfacing arthroplasty system includes (1) an alignment guide for precise guide pin insertion, (2) a modular cannulated cylindrical reamer assembly for accurate femoral head cylindrical reaming and central bone channel drilling, (3) a saw guide for an accurate femoral head osteotomy, (4) a soft tissue protector with a stepped design to shield and retract tissues, (5) a hip retractor that seats onto a prepared femur, (6) an outer hole drill guide aiding drilling of peripheral holes, and (7) a femoral resurfacing implant with a cap portion and central stem adapted for multiple modular attachments including plates. A method for preparing the proximal femur for hip resurfacing with novel stepped cylindrical femoral head osteotomy and central bone channel drilling, leaving an intact collar of cortical bone above the femoral head articular rim.

Abstract: The thruster comprises, on a common plate, a plurality of main annular ionization and acceleration channels having axes that are not parallel and that converge in the outlet direction of the channels. A magnetic circuit sets up a magnetic field in the annular channels. The thruster also has a hollow cathode, a device for regulating the ionizable gas feed rate to each annular channel, and a device for controlling the ion discharge acceleration current in the channels. The direction of the thrust vector of the thruster can be controlled without significantly increasing the mass of the thruster.

Abstract: The closed electron drift plasma thruster uses a magnetic circuit to create a magnetic field in a main annular channel for ionization and acceleration, said magnetic circuit comprises: an essentially radial first outer pole piece; a conical second outer pole piece; an essentially radial first inner pole piece; a conical second inner pole piece; a plurality of outer magnetic cores surrounded by outer coils to interconnect the first and second outer pole pieces; an axial magnetic core surrounded by a first inner coil and connected to the first inner pole piece; and a second inner coil placed upstream from the outer coils. The thruster also comprises a plurality of radial arms included in the magnetic circuit, and a structural base which is separate from the magnetic circuit and which serves, amongst other things, to cool the coils.