44 results about "Articular head" patented technology

A radial-capitellar implant for surgical replacement of the capitellum of the humerus and, optionally, the head of the radius. The radial-capitellar implant includes a capitellar implant or surface replacement arthroplasty of the capitellum and a radial prosthesis for replacement of the head of the radius. In one embodiment the radial prosthesis includes an articular head which moveable articulates with a stem implantable in the radius.

A dual mobility femoral head construct has a secure acetabular shell received within an acetabular recess formed in a pelvis. An implantable prosthetic device is implantable after a failure of an originally installed articular head insert of an acetabular cup assembly. A hemispherical liner is formed from a cast cobalt-chromium alloy for thinness and elasticity. At least three spacers are annularly displaced about an outer diameter of the hemispherical liner to define a uniform cement thickness with the secure acetabular shell. Web shaped depressions are formed circumferentially in the outer diameter of the hemispherical liner to receive cement to resist lever out forces and to secure the cement bond with the secure acetabular shell. A replacement articular head insert is then received for dual mobility rotational movement in an inner diameter of the hemispherical liner. A femoral head implant is received for articulating movement in the articular head insert.

The invention discloses a multiaxial artificial joints tester, which comprises a timber frame. A central support, which is equipped with a cambered seat ring, is arranged at the middle of the timber frame. A spherical base, which is arranged on the cambered seat ring, is equipped with a solution basin. A ball cup is sleeved in the solution basin. A moving platform is fixed to the rim of the solution basin. A plurality of upper spherical hinges are disposed at the bottom of the moving platform. The bottom plate is equipped with a plurality of lower spherical hinges corresponding with the upper spherical hinges. A electric cylinder is obliquely connected between the upper spherical hinges and the lower spherical hinges. The cotyle matching the articular head is disposed above the ball cup. A guide block is disposed above the cotyle. A tension transducer is connected between the cotyle and the guide block. The guide block is disposed inside a guide sleeve. The guide sleeve is equipped with a hydraulic cylinder. The piston rod of the hydraulic cylinder is connected with the guide block. A heating device is disposed inside the solution basin. The top board is equipped with a temperature controller. The tester provided by the invention has the advantages of simple and compact structure, good simulation effect, convenient operation and low cost.

The invention discloses a titanium alloy artificial articular head with wear-resistant ceramic coating and a preparation method of the titanium alloy artificial articular head. The titanium alloy artificial articular head comprises a titanium alloy articular head body, wherein a micropore array texture is formed on the surface of the titanium alloy articular head body, an antifriction and wear-resistant ceramic coating is arranged on the surface of the titanium alloy artificial articular head, and the surface layer of the antifriction and wear-resistant ceramic coating is a compact ceramic coating subjected to pore filling and sealing with hard nanoparticles; the microproe array texture is a regular micropore array which is formed in the surface where the titanium alloy articular head is in contact with a joint cup; and an oxidation ceramic coating is a hard oxidation layer prepared by adopting a two-step plasma electrolytic oxidation process and is compounded on a textured surface. The artificial articular head with the wear-resistant ceramic coating capable of improving lubricating property has the advantages that wear resistance is enhanced, and the wear of paired friction parts, namely cotyle, can be obviously reduced; meanwhile, toughness of the titanium alloy body is maintained, and cost is obviously lower than that of a full ceramic articular head.

A radial-capitellar implant for surgical replacement of the capitellum of the humerus and, optionally, the head of the radius. The radial-capitellar implant includes a capitellar implant or surface replacement arthroplasty of the capitellum and a radial prosthesis for replacement of the head of the radius. In one embodiment the radial prosthesis includes an articular head which moveable articulates with a stem implantable in the radius.

The invention relates to a chute-embedded type humerus prosthesis for shoulder joint, which comprises an articular head prosthesis, chute embedded type cervical pads, a humerus prosthesis handle with a chute, a filling body of a sliding-in channel complementary to the chute, and a corresponding impactor design. The cervical pads are provided with different thickness and angle designs, through installation of which a three-dimensional structure at the proximal end of the humerus can be adjusted, to more reasonably simulate the original anatomical structures at the proximal end of the humerus, thus providing better prognosis, reducing operation difficulties and shortening the operation time. Especially when the implantation of the humerus prosthesis handle is not satisfactorily operated and data of the original anatomical structures can not be acquired, the advantages of the chute-embedded type humerus prosthesis for shoulder joint stand out.

Disclosed are orthopedic implant kits. One disclosed kit comprises an implant having a joint head portion, the joint head portion having a generally convex distal surface and generally concave proximal surface, the implant comprising a post portion protruding proximally from the proximal surface, the post portion having a dorsal surface and a ventral surface (which is a plantar surface in the case of a metatarsal bone) and including a first threaded aperture extending therebetween, and a bone screw. The bone screw has a threaded shaft complementary to the threaded surface of the post portion and preferably is configured to provide bicortical fixation of the implant.

The invention discloses a unidirectional servo-type centrifugal clutch which consists of a centrifugal block, a friction sheet, a spring, a driving hub and a driven hub. The unidirectional servo-type centrifugal clutch is characterized in that the outer circumference of the driving hub is uniformly provided with lugs at intervals; each lug is provided with an articular pan; one end of the centrifugal block is provided with an articular head which is movably installed on the articular pans; and two ends of the spring are respectively fixed on the centrifugal block and the lugs. The unidirectional servo-type centrifugal clutch disclosed by the invention has the characteristics of stable joint, difficulty in sliding, extremely small abrasion, and longer service life.

The invention discloses an articular head with a carbon basement membrane, comprising a metal articular head basal body and the carbon basement membrane arranged at the surface of the metal articular head basal body; the carbon basement membrane sequentially consists of a tantalum-titanium multilayered bottom layer, a tantalum-titanium-carbon transition layer and a tantalum-carbon multilayered top layer from bottom to top; the tantalum-titanium multilayered bottom layer is a lamination layer with alternated tantalum monolayer and titanium monolayer; tantalum-carbon multilayered top layer is a lamination layer with alternated tantalum-titanium composite monolayer and amorphous carbon monolayer; the tantalum-titanium composite monolayer consists of an amorphous carbon basal body and tantalum carbide crystal grains, in the tantalum-titanium composite monolayer, atomic percent of tantalum is 20-40at%, the atomic percent of carbon is 60-80at% and crystal grain size of the tantalum carbide is 2-6nm. The metal articular head with the carbon basement membrane has the characteristics of high biocompatibility, high carrying capacity, high anticorrosion and high wear resistance, the service life of the metal articular head is prolonged and biocompatibility thereof is improved.

The invention relates to the technical field of artificial prosthesis and particularly relates to a superficial replacement prosthesis for an elbow joint. The superficial replacement prosthesis for the elbow joint comprises a prosthetic elbow joint head, wherein a mounting groove is formed in the prosthetic elbow joint head and is mounted at a distal end of a humerus; a connecting part, wherein one end of the connecting part is connected with the prosthetic elbow joint head, and the other end of the connecting part stretches along a proximal end of the humerus; and a bone grafting groove, which is arranged in the mounting groove and is used for accommodating grafted bone scraps. According to the superficial replacement prosthesis for the elbow joint, provided by the invention, the degree of freedom of the elbow joint of a sufferer is not restricted, and the traditional problem that the movement of the elbow joint is restricted is solved; by using the superficial replacement prosthesis for the elbow joint, the mass of bone section of the elbow joint of the sufferer is little, and the recovery and later-stage reconditioning of the elbow joint of the sufferer are facilitated; and furthermore, the bone grafting groove is further arranged and is used for being implanted with bone so as to supplement bone mass of the sufferer, the reducing of the weight of the elbow joint part is facilitated, the degree of comfort of the sufferer is increased, and the bone in the bone grafting groove after long-term recovery can be ankylosed with the humerus, so that the normal form and function of the humerus are restored.

The invention relates to a method for preparing a PLGA (polylactic-co-glycolic acid) modified biological factor microsphere supported bone substituted material. The method comprises the following steps: 1, preparing a drug-loaded chitosan microsphere from carboxymethyl chitosan, recombinant human adiponectin, recombinant human bone morphogenetic protein and sodium tripolyphosphate; 2, modifying the metaphysis, serving as a bone raw material, of a newborn calf articular head or tibia with a modifying agent, calcining the modified bone raw material at 800-1100 DEG C to completely remove the immunizing antigenicity to obtain modified calcined bone powder; and 3, preparing the PLGA modified biological factor microsphere supported bone substituted material from PLGA, the modified calcined bone powder and the drug-loaded chitosan microsphere. The PLGA modified biological factor microsphere supported bone substituted material has certain morphological and mechanical strength, and can be used for sustainably releasing biological active factors for promoting bone formation and locally releasing calcium and phosphor ions on a bone defect position.

The invention provides a temporomandibular joint (TMJ) and mandible joint prosthesis which at least comprises a TMJ fossa prosthesis, a mandible prosthesis and a joint head prosthesis, wherein the mandible prosthesis comprises a mandible ascending ramus part and a mandible extending part, the mandible ascending ramus part and the mandible extending part are connected to form an individualized simulation mandible ascending ramus and at least part of mandible body form; the tail end of the mandible ascending ramus part of the mandible prosthesis is fixedly connected with the articular head prosthesis; and the bent concave surface of the mandible prosthesis is used as the upper side, and a continuous or discontinuous porous structure area is arranged in the middle of the mandible prosthesis.The TMJ and mandible joint prosthesis can repair TMJ functions, mandible forms, dentition defects and the like of various TMJ-mandible joint defects individually at the same time to achieve joint reconstruction of TMJ-mandible-dentitions.

The invention belongs to the technical field of artificial joints and particularly discloses a composite diamond-ene artificial joint. The composite diamond-ene artificial joint comprises an articular head and an articular fossa which are matched with each other. The articular head comprises a metal matrix, and a superfine diamond-ene layer formed by nano diamond-ene is arranged outside the metal matrix. The articular fossa comprises a polyethylene matrix, one side, matched with the articular head, of the polyethylene matrix is provided with a wear-resistant layer which is formed by nano diamond-ene and polyethylene, and the volume ratio of the nano diamond-ene to the polyethylene is 2:3 or 1:1. The composite diamond-ene artificial joint is high in hardness, good in wear resistance and long in service life.

The invention provides a muscle function preservation type all-temporal lower joint prosthesis which at least comprises an articular fossa piece and an articular head piece abutting against the articular fossa piece. The articular head piece comprises a lower jaw rear edge fixing plate, a Z-shaped incisura fixing plate and a joint head part; the lower jaw rear edge fixing plate is connected with the lower end of the joint head part, extends downwards, is of a plate-shaped structure and comprises a lower jaw rear edge surface fitting surface; the Z-shaped incisura fixing plate protrudes out ofone side of the lower jaw rear edge fixing plate, extends in the direction far away from the lower jaw rear edge fixing plate, is of a plate-shaped structure and comprises a lower jaw ascending and supporting second incisura portion attaching face. The prosthesis can effectively repair the normal anatomical structure of the temporal-mandibular joint, preserve attachment of normal extraprandial muscles and occlusal muscles, recover the functions of chewing, speaking, movement and the like of a patient, solve the problems of postoperative mandibular deflection and chewing weakness of the patient, is more precise and smaller in design, reduces operation wounds, shortens operation time and reduces operation difficulty.

In order to conveniently use a scissor trap and a simple fire extinguishing cover, and simplify a space installation structure such as a satellite television antenna, the invention especially provides a variable damping joint analogous to a biological joint. The technology scheme of the invention: the variable damping joint comprises an articular head, an articular fossa and a regulating device. The regulating device contains a nut, or contains a slide block. By the regulating device, variable damping sliding and locking between joints can be implemented. 2-5 such joints can be connected for using, and generally can be combined to a pull bar structure, to form a flexible mechanical arm-helper, which is analogous to a human arm and can extend in a certain range. The helper can be flexible operated, has characteristics of simple structure and simpler usage, can be widely used in industrial and agricultural production and household daily life, and can be produced to be cartoon, movie and television sceneries.

A radial head assembly is provided that includes a stem, a collar, a locking ring, and an articular member. The stem has a convex articular head on one end thereof. The locking ring has a ring wall, which has a ring opening. The ring wall has an angular outer surface and a slot configured to permit the ring wall to radially expand. The angular outer surface engages an angular portion of an interior surface of the collar. The articular member and the locking ring define an articular space within the collar. The articular space is configured to receive the convex articular head.

The invention relates to a myoelectric knee joint which mainly comprises a first-level piston rod, a second-level piston rod, an oil pipe, a small hydraulic cylinder piston rod, a crank, a speed reducer, a sensor, a battery, a control module, a motor, a large hydraulic cylinder body and a small hydraulic cylinder body, wherein the support shell is hinged with an articular head; the articular head is hinged with the first-level piston rod; the second-level piston rod is hinged with the support shell; the large hydraulic cylinder body is hinged with the support shell; the speed reducer and the motor constitute an integral unit (motor speed reducer) which is fixed to the crank; the crank is hinged with the small hydraulic cylinder piston rod; the small hydraulic cylinder piston rod and the small hydraulic cylinder constitute a sliding pair; the battery and the control module are fixed to the support shell; the oil pipe is connected with the large hydraulic cylinder body and the small hydraulic cylinder body; and an oil way control valve, the first-level piston rod and the second-level piston rod are arranged in the oil pipe. The invention enables a thigh amputee to naturally walk on stairs and slopes.

The invention relates to a juvenile development height increaser. The height increaser comprises a bracket, wherein the bracket is connected with a motor (4); the motor (4) is in drive connection with at least one winding roller (6); each winding roller (6) is provided with a pull rope (8); each pull rope (8) is connected with a foot fastener (9); the bracket is connected with a remote control box (13); the remote control box (13) is connected with the motor (4) and is also connected with a remote controller (14); two rows of symmetrical supporting plates (11) are longitudinally arranged in the bracket; a barbell (12) is placed on two symmetric supporting plates (11). The device has the advantages of simple structure, convenience in use, small floor space, suitability for families and capabilities of stimulating growth of articular heads and articular membrane through purposeful bone and joint exercise to scientifically and effectively promote development of bone and joints so as to achieve the purpose of quickly increasing height and filling the blank of domestic juvenile development height increasing training instruments.

The invention provides a glenoid fossa prosthesis and a joint prosthesis with the glenoid fossa prosthesis. An outer cup of the glenoid fossa prosthesis is arranged in a target bone; a liner is arranged in the outer cup; an articular head structure can be movably arranged in the liner; a first communicating channel which is communicated with a joint capsule is arranged on the outer cup; a second communicating channel which is communicated with the joint capsule is arranged in the liner; the first communicating channel is communicated with the second communicating channel so as to guide synoviato a contact surface between the liner and the articular head structure. According to the technical scheme of the invention, the problem of earlier failure of the joint prosthesis caused by high abrasion rate of a joint material resulted from a lack of effective lubrication on a friction surface of the joint prosthesis in the prior art can be solved.

A preparation method of an artificial metatarsophalangeal joint prosthesis, comprises the following steps: performing a CT scan on foot of a patient, and importing the CT scan data into three-dimensional reconstruction software Mimics to obtain a first three-dimensional reconstruction model covering metatarsal bone and toe marrow cavities; performing Boolean subtraction operation on the first three-dimensional reconstruction model and a second three-dimensional reconstruction model to obtain a first model (metatarsal bone and toe marrow cavity morphological model); selecting a model separationfunction of three-dimensional reconstruction software Mimics to obtain a second model (metatarsal bone and toe marrow cavity morphological model); designing a head and a stem of the metatarsophalangeal joint prosthesis separately: performing personalized design of an intramedullary stem according to a shape of morphology of marrow cavity, and performing personalized design of a prosthesis head according to a head shape of the foot metatarsal and phalangeal joints; carrying out 3D printing on the designed intramedullary stem prosthesis and then scanning the intramedullary stem prosthesis; andprinting the designed personalized metatarsophalangeal joint prosthesis model. The metatarsophalangeal joint prosthesis prepared through the method has an advantage of personalized manufacturing, theintramedullary stem morphology is matched with the marrow cavity morphology, the joint prosthesis head is close to the normal joint morphology, requirements of patients can be met to the maximum degree, and prosthesis manufacturing cost is reduced.

The invention relates to a hip implant for fastening to a hip bone (9), comprising a carrier having a pot (6). The convex outer surface of the carrier is designed to rest on the hip bone (9) and at the concave inner side of the carrier has a receptacle for a pelvic-side support designed to receive an articular head of a femoral component of a hip prosthesis. The hip joint implant comprises outwardly directed flat fastening webs (2, 3) which are arranged on the edge region of the pot (6) and are each provided with at least one receptacle for a fastening means. The fastening webs (2, 3) are made of a reformable biocompatible material and are connected to the pot-shaped part (6) via a non-releasable material-fit connection (7), the pot-shaped part (6) being made of a further, more rigid biocompatible material. The high robustness of the pot (6) is thereby combined with an improved adaptation to the anatomical situation of the corresponding hip bone due to the redeformability. Fixation reliability, stability and long-term behavior are thus improved.

A radial head assembly is provided that includes a stem, a collar, a locking ring, and an articular member. The stem has a convex articular head on one end thereof. The locking ring has a ring wall, which has a ring opening. The ring wall has an angular outer surface and a slot configured to permit the ring wall to radially expand. The angular outer surface engages an angular portion of an interior surface of the collar. The articular member and the locking ring define an articular space within the collar. The articular space is configured to receive the convex articular head.