38 results about "Cemented component fixation" patented technology

A bone screw anchor capable of securely fastening a fixation device to weak or brittle bone. The anchor includes a distal region terminating in an open aperture or a solid tapered terminus. The distal region may include cutting flutes and a helical thread extending through an intermediate region, so as to make the anchor self-cutting. The proximal region has a receptor for receiving a driver for driving the anchor within a bore or hole within the bone. The anchor has an interior bore with internal threads for receiving a bone screw used to secure a fixation device to the anchor. The bore may have a plurality of ports providing passage to the exterior of the anchor. Once seated entirely within the receptor, the anchor's position is secured using bone cement. Bone cement is delivered to the bore or hole before the anchor is placed in the receptor or after via the ports.

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 (18,20,22) 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 an extension (30,32,34,36,38,39), such as a stem or pegs, with an exposed outer surface (79). The metal implant component from which the extension extends comprises titanium and the exposed outer surface of the extension comprises a different form of titanium. A method of making the joint prosthesis is also disclosed.

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.

The invention belongs to the technical field of surgical implants and relates to an artificial joint prosthesis with biologically activated surface. The biological activation layer formed on the surface of the artificial joint prosthesis has good biocompatibility and bioactivity and forms natural chemical bonding with the bone tissues, thus improving the bond strength between the prosthesis and the bone tissues, ensuring the stress transfer to be more reasonable and reducing the negative effect of stress shielding. The biological activation layer on the surface of the artificial joint prosthesis is formed by chemical reaction and forms chemical bonding with the matrix, therefore, the problem that the biological activation layer on the surface sheds is avoided, thus ensuring the postoperative long-term effect of the prosthesis. The artificial joint prosthesis is biologically fixed; therefore, wear particles produced when bone cement is adopted for fixation are avoided, thus reducing the possibility of occurrence of aseptic loosening. Besides, the artificial joint prosthesis adopts simple raw materials and process, has low cost and is easy to realize.

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.

The spinal fusion device (100) of the invention is implanted within an intervertebral space between adjacent upper and lower vertebrae and secured to the vertebrae with cement. The fusion device includes upper and lower endplate facing surfaces (150, 160) each having at least one opening (120) for delivering cement material to adjacent contact surfaces of the vertebrae above and below the implant. Utilizing quick-setting cement compositions with the device <:an allow for almost immediate fusion of the vertebrae, thus, reducing or eliminating the need for adjuvant fixation devices such as screws, plates, and / or rods, while also simultaneously providing precise delivery of cement to contact surfaces between the fusion device and vertebrae.

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.

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.

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.

The invention discloses a joint prosthesis system which 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.

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.

The invention discloses a bionic type hydraulic artificial vertebral body design for spinal physiological function reconstruction. The bionic type hydraulic artificial vertebral body comprises a main cylindrical artificial vertebral body with a core structure, wherein the inner part of the core structure contains pistons (13 and 14) and hydraulic bags (10 and 11). An upper end plate (24) and a lower end plate (25), which are matched with semielliptical (spherical) motion shafts (21 and 22) in structure, are arranged at two ends of each piston. The end plates of the artificial vertebral body are normal adjacent vertebral end plate flats (cemented fixation) or fixed stings (31 and 32) with metal millipores and biological material coating millipores (biological type fixation), and the rear edge of the vertebral body can be further fixedly arranged at a pedicle of vertebral arch through card slots (40 and 41) of the fixed structure of a pedicle of vertebral arch staple bolt (45). The vertebral body design can be further shrunk as a hydraulic artificial intervertebral disc design (60).

The invention discloses an all-ceramic artificial hip-joint prosthesis and a preparation method thereof. The artificial hip-joint prosthesis includes a ceramic acetabulum and a ceramic femur. The outer surface of the ceramic acetabulum is hemispherical and is provided with mutually intersected annular grooves and longitudinal grooves; the inner surface of the ceramic acetabulum is in a ball-like shape; the ceramic femur comprises a femoral stem and a femoral head which are connected; the femoral head is attached to the ball-shaped inner surface of the ceramic acetabulum, and connects the ceramic femur with the ceramic acetabulum. Ceramic serves as the preparation material of the prosthesis, and the prosthesis has good abrasion resistance. Besides, the surface of the prosthesis is provided with the grooves, and therefore when the prosthesis is installed, people do not need to use bone cement for fixation and do not need the biological surface for bones to grow into. Stability is achieved through press fit of the prosthesis and bone tissue.

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 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 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 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 relates to the technical field of artificial joint replacement, and provides a femoral stem and a preparation method thereof.The femoral stem comprises a stem body, a microporous titanium layer and a rod body, the stem body is provided with a connecting section and a fixing section, and the connecting section is inclined relative to the fixing section; the microporous titanium layer is arranged on the outer side of the fixed section; the rod body is connected with the fixed section, and the diameter of the rod body is smaller than that of the fixed section; the fixed section is provided with a sight hole, an injection runner and a backflow runner, one end of the sight hole is open, and the other end of the sight hole extends towards the rod body; the injection runner penetrates through the fixed section and is communicated with the sight hole; the backflow flow channel and the injection flow channel are oppositely arranged, and the backflow flow channel is communicated with the sight hole and the injection flow channel. Two fixing modes of biological fixation and bone cement fixation are combined, the bone cement does not influence biological fixation interface tissues, the tissues can effectively grow and fuse, and the bone cement is matched to form long-term and stable fixation on the femoral stem, so that the immediate stability and the long-term stability are realized, and the application effect is excellent.

The present invention relates to the technical field of artificial joint replacement, and proposes a femoral stem and a preparation method thereof, comprising a stem body, a microporous titanium layer and a rod body, wherein the stem body has a connecting section and a fixed section, and the connecting section is inclined relative to the fixed section; the microporous titanium layer is arranged on the outside of the fixed section; the rod body is connected to the fixed section, and the diameter of the rod body is smaller than the diameter of the fixed section; the fixed section is provided with a viewing hole, an injection flow channel and a return flow channel, wherein one end of the viewing hole is open and the other end extends toward the rod body; the injection flow channel runs through the fixed section, and the injection flow channel is connected to the viewing hole; the return flow channel is arranged relative to the injection flow channel, and the return flow channel is connected to the viewing hole and the injection flow channel. The present invention combines two fixing methods, biological fixation and bone cement fixation, and bone cement will not affect the biological fixation interface tissue, the tissue can effectively grow and fuse, and the femoral stem is fixed for a long time and stably with bone cement, and has immediate stability and long-term stability, and has excellent application effect.

The invention belongs to the technical field of surgical implants and relates to an artificial joint prosthesis with biologically activated surface. The biological activation layer formed on the surface of the artificial joint prosthesis has good biocompatibility and bioactivity and forms natural chemical bonding with the bone tissues, thus improving the bond strength between the prosthesis and the bone tissues, ensuring the stress transfer to be more reasonable and reducing the negative effect of stress shielding. The biological activation layer on the surface of the artificial joint prosthesis is formed by chemical reaction and forms chemical bonding with the matrix, therefore, the problem that the biological activation layer on the surface sheds is avoided, thus ensuring the postoperative long-term effect of the prosthesis. The artificial joint prosthesis is biologically fixed; therefore, wear particles produced when bone cement is adopted for fixation are avoided, thus reducing the possibility of occurrence of aseptic loosening. Besides, the artificial joint prosthesis adopts simple raw materials and process, has low cost and is easy to realize.

An orthopedic augment (100) can be used where the patient's bone at an implantation site is structurally compromised to aid in securing the orthopedic prothesis at the implantation site. The orthopedic augment has, on an internal surface (2) thereof, cement fixation features (3) that receive an orthopedic cement therein and aid in resisting separation of the orthopedic prosthesis from the orthopedic augment. In addition, the orthopedic augment may include mechanical fixation mechanisms to engage the orthopedic prosthesis. Thus arranged, the orthopedic augment provides greater flexibility, in that it can be used in the form of a cone (e.g., cemented fixation) or a sleeve (e.g., mechanical fixation).

The invention discloses a large-wing-type knee joint pulley groove prosthesis. The large-wing-type knee joint pulley groove prosthesis comprises a pulley curved surface, a bone cement groove and a middle column, wherein the pulley curved surface and the bone cement groove integrally form the pulley groove prosthesis, and the middle column is integrally arranged at the bottom of the pulley groove prosthesis; and the bone cement groove comprises a bone cement fence, bone cement fixing blocks and a bone cement pool, the bone cement fence is arranged at the edge of the pulley groove prosthesis, the bone cement pool is arranged on the pulley groove prosthesis on the inner side of the bone cement fence, and the bone cement fixing blocks are arranged on the bone cement pool on the inner side of the bone cement fence. The large-wing-type knee joint pulley groove prosthesis has the advantages that bone cement is adopted for fixation, fixation is firm, micro-motion is allowed, and the service life is longer; ceramic or cobalt-chromium-molybdenum alloy materials are adopted, the strength is high, the hardness is high, deformation is not prone to occurring, the scratch resistance is good, the surface smoothness is high, and friction and abrasion are extremely small; and the operation difficulty is lower, the number of operation tools is smaller, the operation time is shorter, no fracture risk exists in the operation, the bone integrity is good, the looseness rate is low, and the service life is remarkably prolonged.

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.