31 results about "Cemented component fixation" patented technology

A system and method for joint arthroplasty may utilize one or more scaffolds to help support an arthroplasty prosthesis for the joint. A natural or prosthetic articulating surface may first be removed from one of the bones of the joint. This may expose a resection surface. A target portion of the resection surface may be identified based on, for example, fit and function testing of the joint with a trial arthroplasty prosthesis in place on the resection surface. One or more scaffolds may be placed on the target portion, and bone cement may be positioned adjacent to the scaffold(s) to define a raised surface that provides better fit and/or function than that which would be obtained with placement on the recessed surface. The arthroplasty prosthesis may be secured to the raised surface through the use of the bone cement.

A joint prosthesis system (10) is suitable for cemented fixation. The system has two metal implant components (12, 14) and a bearing (16). One of the metal implant components has an articulation surface (18, 20) for articulation with the bearing. The other metal implant component has a mounting surface (26) for supporting the bearing. One of the metal implant components includes a solid metal portion (80, 80A) and a porous metal portion (82, 82A). The porous metal portion has surfaces with different characteristics, such as roughness, to improve bone fixation, ease removal of the implant component in a revision surgery, reduce soft tissue irritation, improve the strength of a sintered bond between the solid and porous metal portions, or reduce or eliminate the possibility of blood traveling through the porous metal portion into the joint space. A method of making the joint prosthesis is also disclosed. The invention may also be applied to discrete porous metal implant components, such as augment.

A stem (100) for use in a joint prosthesis, such as a femoral stem for a hip joint prosthesis, the stem comprising: a solid central core (102); a proximal outer layer (127) disposed over a proximal portion (101a) of the central core, wherein the proximal outer layer comprises a set of longitudinal ribs (120), defining slots (130) there between; and a distal outer layer made of a deformable porous material disposed over a distal portion (101b) of the central core. The arrangement is such that the stem (100) can be made with a relatively large diameter yet without being excessively stiff, for cementless fixation in osteoporotic patients. The deformability of the distal outer layer also mitigates against the risk of intraoperative bone fractures.

A joint prosthesis system is suitable for cemented fixation. The system has two metal implant components and a bearing. One of the metal implant components has an articulation surface for articulation with the bearing. The other metal implant component has a mounting surface for supporting the bearing. One of the metal implant components includes a solid metal portion and a porous metal portion. The porous metal portion has surfaces with different characteristics, such as roughness, to improve bone fixation, ease removal of the implant component in a revision surgery, reduce soft tissue irritation, improve the strength of a sintered bond between the solid and porous metal portions, or reduce or eliminate the possibility of blood traveling through the porous metal portion into the joint space. A method of making the joint prosthesis is also disclosed. The invention may also be applied to discrete porous metal implant components, such as augment.

The present invention essentially relates to a hip joint endoprosthesis stem for cement-free or cemented anchoring in bones that is anchored in the femural neck and in the proximal metaphysis and preserves the internal spongiosa and compact structures that reinforce the femur, that gives the design element axial access to the medullary canal, and possesses parabolically curved outer surfaces to optimize the transfer of force to the bone.

The invention discloses a personalized femoral stem prosthesis easy to remove and renovate and a manufacturing method thereof. The prosthesis consists of a personalized NiTi alloy porous biological femoral stem casing and a personalized femoral stem body. In order to solve the problem that traditional bone fixed with cement is not easy to renovate, the prosthesis utilizes a biological porous femoral stem casing and is characterized in that the stem casing is matched with a medullary cavity structure, but is slightly smaller than the medullary cavity structure. The stem casing is formed by using NiTi alloy with memory effect through 3D printing method and subjected to a later memory training; the stem casing is a naturally expanded porous structure in the form; and according to the stress analysis, the porosities in the outer side and the inside of the femur is different to a certain extent; the phase-change temperature point of the memory effect of the stem casing is 10-20 DEG C lowerthan the body temperature. The stem casing is in a contracted state when the temperature is lower than the phase-change temperature point, and the stem casing is in an expanded state when the temperature is higher than the phase-change temperature point; the prosthesis has the advantages of simple structure design, high compatibility with the bone marrow cavity structure, good biocompatibility andthe like, and can prevent the femoral stem prosthesis from sinking, loosening or twisting and the like.

A medical device for fixation in a femoral bone of a patient is provided, the medical device comprises: a connecting portion adapted to be connected to a prosthetic hip joint contacting portion, an expanding portion, and a bone contacting surface on the expanding portion. The expanding portion could be adapted to be at least partially inserted into the femoral bone of a patient and to expand within the femoral bone, such that the bone contacting surface is placed in contact with the inside of the femoral bone for fixating the medical device to the femoral bone. By the fixation using an expanding portion a sturdy fixation is achieved without the need to go into or penetrate bone, or the need for fixation using bone cement.

A protective enclosure for protecting well head equipment at a surface location is made up of an open framework of structural members which surround and protect the well head. Individual steel panels are assembled to form a series of upstanding walls which are covered by a series of roof panels and which together define the quasi-enclosed area surrounding the well head. The roof panels are covered with a steel grating which forms a covered roof for the protective enclosure. The tubing which makes up the steel panels is spaced to allow access to the enclosed area by a worker needing to access the well head. Upright legs of the steel panels are joined together by hinged brackets. The panels can also be secured to the surrounding terrain by a cemented retainer arrangement.

A system, method and apparatus for dental of an anterior tooth. The system includes an abutment having a generally cylindrical post extending from a base. A bore is defined through an anterior face of the post and extends through the base. A protrusion extends from an aft end of the base and is configured to receive a threaded fastener to secure a crown to the abutment. The abutment is secured to a dental implant via a screw extending through the bore into the implant.

The invention discloses an acrylic cement fixation screw and an acrylic cement injection device. The acrylic cement injection device comprises a controller, a connecting rod, an injection syringe andthe acrylic cement fixation screw;the controller is provided with an operation channel, and the connecting rod is provided with an injection channel; the acrylic cement fixation screw is connected with one end of the controller, one end of the connecting rod extends into the operator channel of the controller, and the end of the connecting rod is in contact with the screw tail of the acrylic cement fixation screw; and the other end of the connecting rod is connected with the injection syringe. According to the acrylic cement fixation screw, acrylic cement can be well fixed to avoid postoperative displacement of the acrylic cement, meanwhile, zero incision is achieved after operation of the acrylic cement fixation screw, the screw is completely located in a vertebral pedicle of a diseased vertebra, muscle or skin abrasion is avoided, and side effects and influences on patients are avoided.

The invention discloses a Zeng's calcaneus osteotomy heighten operation and a false body therewith. The osteotomy plane of the Zeng's calcaneus osteotomy heighten operation is on a calcaneus long shaft plane, an unclenched gap after the calcaneus is internally planted with the false body, and the osteotomy plane is fixed with the false body by a tension bolt or medical bone cement. The invention can realize immediate heightening and has hidden scar, short time of leaving a sickbed and less complication diseases, thereby according with the aesthetics requirement and the social requirement of modern shaping and beauty.

The invention provides a tibial platform prosthesis assembly. The tibial platform prosthesis assembly comprises a platform prosthesis and many types of fixation assemblies, wherein the fixation assemblies can be selectively mounted on the platform prosthesis. Since the fixation assemblies are detachably arranged on the platform prosthesis of the tibial platform prosthesis assembly, the fixation assemblies can be used for mechanically fixing the platform prosthesis during actual use, and then bone cement is used for fixation. Compared with conventional structures of platform prostheses in whichthe fixing assemblies are not arranged, the tibial platform prosthesis assembly has the advantages that the platform prosthesis is mechanically fixed, a foundation is laid for long-term bone integration, favorable conditions are created, and thus the platform prosthesis can be prevented from moving or loosening after installation. The installation stability of the tibial platform prosthesis assembly is improved.

A torsional-mode ultrasonic vibration generator is manufactured with longitudinal slots extending along its horn which damp unwanted vibrational modes and allow it to be made significantly smaller than previous apparatus. The torsional-mode ultrasonic generator is operable with a suite of surgical tools, to perform portions of an orthopaedic arthroplasty revision procedure. Three of the tools are for removing bone cement from within a bone cavity on a prosthesis cemented into the bone cavity. Three other tools are for separating an uncemented prosthesis from ingrown bone by cutting the bone between the prosthesis and walls of the bone cavity. The seventh tool is provided with sensors to determine a separation between a bone-cutting tool head and a metal prosthesis, feedback from the sensors being used to control servo motors of an articulated mounting for the seventh tool, to maintain the separation at a desirable value.

The invention discloses a bone cement fixation device and method. The fixation device comprises a screw, a connector and a push rod, the screw comprises a screw head and a screw body, a bone cement channel is formed in the screw body, a groove is formed in the screw head, the connector is of a cylindrical structure, and the lower end of the connector is matched with the groove in shape; a push rodis inserted into the cylinder cavity of the connector; the fixation method comprises the following steps that the screw is screwed into a vertebral body, the lower end of a connector is connected tothe groove, the cylinder cavity of the connector is communicated with a bone cement channel, bone cement is injected into the cylinder cavity, a push rod is inserted into the cylinder cavity, the pushrod is pushed downwards, and part of the bone cement is injected into the vertebral body through the bone cement channel; and the bone cement channel is filled with the other part of the bone cement.According to the bone cement fixation device and method, bone cement in the vertebral body can be well fixed, and therefore the treatment effect is guaranteed.

The present invention disclosed resolves the main problems of bone-sparing hip resurfacing surgery by using only an acetabular component in which the femoral head articulates, being only shaved to a spherical shape and cleared of osteophytes that could impinge on the acetabulum and so restrict the range of motion. The inner surface of the resurfacing cup is aspherical in shape creating an annular contact with the femoral head. The inner, articulating surface of the cup (10) is ADLC or pyrolytic carbon coated to reduce friction and wear of the femoral head. The surgical approach is well developed with surgery time significantly reduced by avoiding the use of the femoral resurfacing component. The cup is preferably of the double¬shell type for cementless fixation, but it can also be made as a single shell for cementless or cemented fixation. Should a revision surgery due to wear of the femoral head become necessary, the cup can be retained and combined with a dual mobility femoral component.