257 results about "Artificial hip joints" patented technology

An orthopedic device and method of use are provided that incorporate complex, non-spherical articulating surfaces to allow a greater available range of motion compared with existing artificial shoulder joint and artificial hip joints. According to some embodiments, complex, non-spherical articulating surfaces can be incorporated on a humeral head and/or glenoid of a shoulder prosthesis. In other embodiments, complex, non-spherical articulating surfaces can be incorporated on the acetabulum and/or femoral head of a hip prosthesis. These non-spherical surfaces can be used to adjust constraint, joint thickness, soft tissue tension, moment and arc of motion, and in doing so, influence motion.

The invention shows a hip joint socket and its manufacture, with the hip joint socket including a thin walled metallic outer shell with anchoring pins which is firmly connected to an inner shell of plastic. Since the bearing surface of the inner shell is not produced until after the assembly, a high accuracy of shape of the bearing surface results together with a relatively elastic outer shell and with good anchoring aids for a primary anchoring.

Disclosed are a femoral stem for artificial coxal articulation, in which portions of the femoral stem interfering with and contacting an insertion in the joint movement of the femoral stem are removed from the femoral stem so as to maximize the range of the joint movement thereof while maintaining the cross sectional area thereof, and a method for processing a neck portion of the femoral stem. The method includes cutting symmetrical portions of the outer circle of a circular rod to form cutting planes inwardly inclined such that the cutting planes contact a virtual inner circle having the same center as that of the outer circle; and rounding a portion between the cutting planes along the inner circle so that the inner part of the outer circle is shorter than the outer part of the outer circle.

An artificial hip joint is provided including a generally hemispherical acetabular cup with a generally hemispherical liner mated within the acetabular cup and with a locking ring to secure the liner within the acetabular cup. The acetabular cup is adapted to be secured within a hip bone. The liner includes a hemispherical inside surface for pivotably supporting a head at an upper end of a femur. The locking ring resides within an annular groove in the acetabular cup and an annular seat in the liner. The locking ring includes a captured end and a free end. The captured end includes a slot which cooperates with a post in the acetabular cup to slidably hold the captured end to the acetabular cup. The locking ring removably attaches the liner to the acetabular cup.

A ball joint or cap for an artificial hip joint is described that is suitable for carrying out a rotating or pivoting motion in an artificial hip joint socket, with a gap being provided for a natural fluid film (synovial fluid) between itself and the artificial hip joint socket, and with regular depressions without interconnecting channels between them being recessed in areas of its surface. It is proposed that its surface in the polar area is smooth and without depressions, that an area is provided in an intermediate area between the smooth polar area and its equator, in which depressions are recessed with hole widths between 1.0 mm to 3.0 mm, that adjacently in the intermediate area in the direction of its base edge, further depressions are recessed, the hole widths of which become steadily smaller, the closer they lie to the base edge, with hole widths between 0.5 mm and 1.0 mm.

The invention provides a method for preparing a hydroxyapatite/titanium dioxide composite bioactive coating on the surfaces of medical metals such as a titanium alloy, and the like, and belongs to the technical field of the preparation of bioactive coatings on the surface of the titanium alloy. The composite coating is prepared by preparing precursor sols of HA and TiO2 respectively, then mixing the precursor sols of the HA and the TiO2, and performing aging, coating, drying and heat treatment. The coating has high bioactivity, low cost of preparation technology, and high bonding strength with a matrix, is applicable to the preparation of surface coatings of various complicated geometric structures, and can be used for surface modification of surgical implants such as artificial hip joints and dental implants as well as orthopedic instrument products.

A composite material for reparing tooth and human hard tissue is prepared through preparing the partly sintered ceramics, surficial coupling, and vacuum dipping in resin while in-situ polymerizing.

The invention provides an artificial hip joint without a shaft which includes an enhancing bone plate for supporting the femur, the plate having more than one hole on its surface, fixing elements for fixing the plate on the surface of the femur extending through these holes respectively; an enhancing bone screw which is expended through the plate and the femur; a center bone screw which is screwed with the enhancing bone screw; the other end of the center bone screw extending out of the femur neck; and a femur neck protecting device for protecting the femur neck, the device being fixed on the end which is not connected with the enhancing bone screw. With the fixation of the center bone screw, the protecting device can ride against the surface of the femur tightly so that it can protect the remaining bone cutting off the diseased or damaged. It can also enhance the rigidity and stabilization of the bone which is not well in function by the support of the enhancing bone plate.

A femoral stem 2 for artificial hip joint is provided that is capable of tightly fixing a greater trochanter and is suitable for treatment of transcervical fracture where it is necessary to fix the greater trochanter. The femoral stem 2 comprising: a stem member 20 including a distal part 21 of the stem member which is inserted in a medullary cavity of a femur and fixed therein and a proximal part 22 of the stem member which has a neck 26 for fixing an artificial head and is positioned at a proximal end of the distal part, the distal part and the proximal part being integrated or separable; a plate fixing portion 36 which is detachably attached at a top of the proximal part; and a greater trochanter plate 3 for depressing the greater trochanter 71, the greater trochanter being fixed to the plate fixing portion 36 at a certain angle or fixed to the plate fixing portion so as to adjust an angle. Since the greater trochanter plate 3 is fixed onto the femoral stem 2 of the present invention, the greater trochanter is tightly fixing and thus the fixation can be stabilized. Furthermore, since the greater trochanter plate 3 is fixed at the top of the proximal part 22, the greater trochanter plate 3 covers the top of the greater trochanter 71 when the greater trochanter 71 is fixed. Therefore upward displacement of the greater trochanter by a gluteus medius musculus can be effectively suppressed.

The invention relates to an artificial hip joint fatigue testing device. The artificial hip joint fatigue testing device comprises a framework, a moving mechanism, a loading mechanism and a test piece, wherein the framework is connected with the moving mechanism by screws; the loading mechanism is fixed on the framework; the test piece is positioned between the loading mechanism and the moving mechanism; the loading mechanism is internally provided with a force sensor and a thread adjusting mechanism, and is used for determining and adjusting load force on line; a motor drives a connecting rod mechanism so as to enable a middle moving platform to move up and down in a reciprocating mode; a spring is loaded on the upper part of the middle moving platform so as to test the prosthetic body fatigue performance in the motion state. The testing device provided by the invention can simulate the motion situation of a human body by the reciprocating motion, can test the artificial hip joint prosthetic body fatigue performance under different load conditions, and is low in manufacturing and maintaining cost, convenient to operate and easy to popularize and apply.

The invention discloses a nanoparticle-reinforced polyether-ether-ketone joint prosthesis material as well as a preparation method and application thereof. Nanoparticles filled in polyether-ether-ketone serve as crosslinking points to form a polymer composite material of a net crosslinking structure; the composite material is used as manual hip joint in a joint prosthesis; the inner surface layer of the hip joint is made of a nanoparticle-reinforced polyether-ether-ketone joint prosthesis material, and the thickness of the inner surface layer is 2-4mm; and the outer surface layer of the hip joint is made of polyether-ether-ketone, and the thickness of the outer surface layer is 8-10mm. The nanoparticle/PEEK (polyether-ether-ketone) composite material prepared by the preparation method has low nanoparticle filling amount which is less than 10wt%. The abrasive resistance of the preferable composite material is improved by 8 times compared with that of the pure PEEK, a friction coefficient is lowered to 1/2 of that of the pure PEEK; the hardness and wettability of the nanoparticle-reinforced PEEK composite material are improved, and abrasion on friction couples can be lightened.

The invention discloses a multi-workbench detecting and experimenting device for artificial hip joint abrasion. The multi-workbench detecting and experimenting device for artificial hip joint abrasion comprises a frame, an artificial hip joint driver and a controller. The artificial hip joint driver which is an artificial hip joint motion synthesizing mechanism comprises an artificial hip joint simulating workbench module, a tester workbench transmission module and a tester workbench loading module. Actual application conditions of the artificial hip joint can be reproduced authentically and reliably and abrasive particles similar to actual applications can be generated. The detecting and experimenting device has multiple workbenches, driven by a single motor, for testing a plurality of artificial hip joints simultaneously and has high compatibility, and is applicable to experiments on different specifications of artificial hip joints, high in work efficiency, low in manufacturing cost, and easy to operate.

The invention discloses a production method of an acetabulum navigation template. The production method comprises building a three-dimensional model of a pelvis according to computed tomography scanning data of the pelvis; extracting surface point clouds of an acetabulum in the three-dimensional model; fitting the surface point clouds to an optimal sphere and enabling a sphere centre coordinate to be a rotation center coordinate of the acetabulum; utilizing a triangle function relation and the rotation center coordinate of the acetabulum to calculate to obtain a direction vector of a navigation tube in the acetabulum navigation template; and utilizing a rapid prototyping technology to produce an entity of the acetabulum navigation template. The production method of the acetabulum navigation template has the advantages of enabling the acetabulum navigation template entity which is highly matched with acetabulum fossa ovalis of patients to be produced; enabling physicians to perform planning and simulation according to actual conditions of skeletons of the patients before operation; enabling a convenient contact to be established between a preoperative plan and intraoperative operation; and providing a new method and an effective auxiliary means for accurate implantation of acetabular cup prosthesis in artificial hip replacement.

The invention relates to an artificial hip joint dynamic fatigue wear sample clamp and a tester. The clamp comprises a femoral head sample fixing part for driving femoral head samples to rotate and an acetabulum sample fixing part, wherein the acetabulum sample fixing part comprises a base and an inclined tray; and acetabulum samples are mounted on the base which is arranged in the inclined tray. The tester comprises a femoral head sample rotating part, a sample clamp and a sample loading part, which are positioned at the upper part of the tester, wherein the femoral head sample rotating part comprises a rotating motor and an upper spindle rotating under the driving of the motor; tail conical holes for mounting the femoral head samples are formed in the lower end part of the upper spindle; and the sample loading part comprises a loading motor, a speed reducer and a loading drive part for applying load to the acetabulum samples. The test clamp is simple in structure and convenient to install. The tester has the advantages that the structure is advanced, the control is accurate and the test data reliability is high.

The invention discloses a UHMWPE (Ultra High Molecular Weight Polyethylene) artificial joint with a surface wear-resistant layer and a preparation method of the UHMWPE artificial joint. Vacuum irradiated UHMWPE or a composite material thereof is used as a wear-resistant surface layer for forming a polymer composite material with a lamellar structure; and the material is applied to an artificial hip joint and an artificial knee joint tibia pad in the field of artificial joints, wherein the wear-resistant surface layer is formed by the vacuum irradiated UHMWPE or the composite material thereof and a matrix layer is prepared from unirradiated UHMWPE. Compared with the wear resistance of the unirradiated pure UHMWPE, the wear resistance of the UHMWPE artificial joint material with the surface wear-resistant layer, which is prepared by the invention, is improved for three times under the condition that a calf serum knee joint is worn; the matrix material keeps the related characteristics of original UHMWPE; physical impact resistance capacity of the material can be improved; and service life of the artificial joint is prolonged.

The invention relates to a multifunctional experimental device for tribology, comprising a machine station frame and a variable speed motor. The invention is characterized in that: a middle cross beam is arranged on the machine station frame, and a rotary tray is pivotally inserted in the middle cross beam through a planar bearing; a downward extended rotating shaft of the rotary tray is connected with the variable speed motor through a coupling, while the tray at the upper end is connected with a lower turntable fixture of an experiment module; a loading plate is arranged in the top part of the machine station frame, a loading top compression leg is fixedly connected with the center of the loading plate, and the loading top compression leg is connected with an upper axle pin fixture of the experiment module. The experimental device has the advantages of the use for artificial hip joint simulation and experiment and pin-disk type friction experiment, and strong compatibility, low cost and easy operation.

The invention relates to a titanium alloy artificial hip joint provided with a wear-resistant ceramic coat and a manufacturing method thereof, which relates to the titanium alloy artificial hip joint and the manufacturing method thereof. The invention solves the problems existing in the existing caput femoris provided with a film of thin film thickness, low bonding strength of the film and a matrix, poor mechanical bearing strength and bad wear resistance and durable stability. The wear-resistant ceramic coat is coated on the spherical surface of the titanium alloy caput femoris and the surface of a titanium alloy articulation coax cup. A cylindrical slot that has fit connection with a femur handle is arranged on the upper end surface of the titanium alloy caput femoris. The method of the invention is that the joint is polished, shielded, installed and blocked; then the joint is processed by spark intensifying electrochemical oxidation to produce the wear-resistant ceramic coat; the joint is taken out, cleaned and dried; and finally, the surface of the joint is processed by polishing treatment. The artificial hip joint of the invention has the advantages of thick caput femoris film, strong bonding strength of the film and the matrix, good mechanical bearing strength and sound wear resistance and durable stability, etc. And the manufacturing method of the invention has simple process flows.