72 results about "Femoral head" 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.

A checking jig comprising: a body having an aperture therethrough which in use can be placed over a guide wire located in a well in the head of the femur; an arm extending from the body and shaped to extend around the head of the femur; a tip located on the end of the arm remote from the body said tip representing the diameter at which a particular size of sleeve cutter will cut; and means for adjusting the position of the tip between different positions representing different cut diameters.

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.

A real-time visualization assistant positioning system for the interior of a hip joint in total hip replacement arthroplasty is divided into two portions of hardware and software, wherein the hardware can be divided into three modules of a sensing data gathering module, a data merging and processing module and a data transmission module according to functions, and takes charge of gathering information of images, accelerated speed and the like, encapsulating the information into data of an image, and transmitting the data of the image to a computer or a flat computer, and the software can be divided into four portions of a data extraction portion, a position and posture measurement and calculation module, a data fusion portion and a three dimensional (3D) display module, and takes charge of figuring out a relative position and a relative posture of an artificial thigh bone and acetabulum through various sensing data, improving precision and reliability of measurement and calculation through fusion of redundant data, and showing the relative position and the relative posture to a doctor in 3D mode. The real-time visualization assistant positioning system for the interior of the hip joint in the total hip replacement arthroplasty presents movement status of the thigh bone in the acetabulum and a relative position relation of the thigh bone and the acetabulum in real time, assists the doctor in visually observing installation status of the artificial thigh bone with the acetabulum during the operation process, and greatly improves success rate and operation curative effects of the total hip replacement arthroplasty.

A femoral neck fixation prosthesis and method of using same which reduces bone loss and the avoids the other shortcomings of the prior art by allowing the fixation of a stable femoral head replacement while reducing the amount of the femur which must be reamed for the insertion of the prosthesis. The preferred embodiment provides that the femoral head is attached to a fixation prosthesis, which extends coaxially through the canal of the femoral neck, into the femur, and is then attached to the opposite lateral wall of the femur. In this manner, the prosthesis serves to imitate the original structure of the femoral neck. No other support members, either crosspins or arms extending into the length of the femur, are required.

Revision hip implants and prosthesis systems include femoral heads, cups, screws, bridges, and segmental prostheses for revision surgeries.

The invention provides a thighbone positioning method of robot full-knee joint replacement. First, abstract the problem to determine the center of thighbone into a geometric model to find the sphere center according to the known point on the sphere, combine three arbitrary points according to the collected spacing-socket central data of the thighbone, determine the coordinate information of the thighbone center by numerical calculation, then build the thighbone reference frame, then make the vectors on coordinate axes of three thighbone reference frame in the robot reference frame and ones on three coordinate axes of the robot reference frame compose a one-to-one relationship, and thus, find and build the corresponding relationship of the robot and thighbone reference frames, which accurately positions the thighbone.

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.

The invention discloses a method for determining the biological force line of lower limbs in a three dimensional space. A caput femoris central point, a knee joint central point and an ankle joint central point are determined respectively in the three dimensional space, the caput femoris central point is used for three-dimensional reconstruction of the lower limbs of the human body, perfusion is conducted on collum femoris, caput femoris and greater trochanter after three-dimensional reconstruction, and then the geometric center of a perfusion body is found through Mimics or 3D Slicer; the knee joint central point adopts the center of a knee joint non-bony space perfusion body; the ankle joint central point adopts the center of an ankle joint non-bony space perfusion body. The method avoids the defects that in the prior art, the measurement result, obtained by visual inspection, protractor measurement and body X-ray measurement on a two-dimensional platform, of the force line of the lower limbs is greatly affected by interference, data has no standard and the subjectivity is high; the accuracy of the method is higher, and the method is more in line with the measurement of the forceline of the lower limbs.

Methods and devices for treatment of osteonecrosis of the femoral head with core decompression include a dowel adapted for placement into a core decompression channel of a femoral head. A cathode at the distal end of the dowel provides electrical stimulation of bone growth in the femoral head. A method of treating osteonecrosis of the femoral head involves placing a dowel having a cathode thereon into a core decompression channel of a femoral head in a state of osteonecrosis. Electrical current is supplied to the cathode for electrical stimulation of bone growth in the femoral head.

The surgical simulator contains a one-piece simulated uterus having a uterine fundus and body. A rigid hollow support base has a recess in its support surface that is complementary to the shape of at least a portion of the uterine fundus and body so that at least a posterior portion of the uterine fundus and body fit securely into the recess to retain the simulated uterus in position during use. Liquid can be introduced into the base to add weight, and the liquid can be heated to heat the simulated uterus to body temperature. The base can also provide a rigid hard tissue component that simulates the surface topography of the pelvic bone, portion of the spine, hip joints and heads of the femurs. The hard tissue component can be encased in an elastomeric material that simulates muscles and skin to practice obstetric procedures such as a C-section, insertion of an intrauterine tamponade balloon, insertion of an intrauterine contraceptive device, or insertion of compression sutures such as the B-Lynch suture.

The invention discloses a novel artificial hip joint and a manufacturing method thereof. The novel artificial hip joint comprises an advanced porous layer PCA (porous coated anatomic) spherical crown (1), an alloy acetabular cup (2), a metal ceramic acetabular lining (3), a metal ceramic femoral head (4), a metal handle (5), a collar (6), an advanced porous layer PCA plane ring (7), a metal handle guide pipe (8) and an advanced porous layer PCA net ring (9). According to the invention, the stress shielding of the artificial hip joint is removed and the proximal femoral osteopenia is prevented through femoral stem separation; the stress shielding on acetabular fossae is removed by increasing the pressure intensity; the osteolysis, the stem looseness and the femoral brittleness caused by wear debris are greatly reduced by using the metal ceramic acetabular lining and the femoral head with flexibility enhancement; and by improving the raw material selection and diffusion welding processes of the PCA structure part, the binding force of the PCA structure part and the bone tissues of a human body is increased, the postoperative problems of a patient are reduced, the comprehensive quality of the artificial hip joint is essentially improved, and the service life of the artificial hip joint is essentially prolonged to be longer than thirty or forty years at least.

The invention discloses a method for manufacturing an intra-head femur stent. The method manufactures the designed product by means of laser beam scanning controlled by a computer to sinter and superpose metal powder materials in layers. The essential microstructure of each part of the intra-head femur stent prepared by the method is formed of units of the same structure that are superposed, and each small unit is a rectangular hexagonal frame formed of 12 edges. The finished product of the stent has enough strength and meanwhile, is coarse in the surface of the body, provided with a regular porous structure inside the body and suitable for the growth of bone tissue.

The invention discloses an artificial joint femoral stem which comprises a joint femoral stem body and at least one titanium alloy layer on the partial outer surface of the end part, close to a femoral ball head, of the joint femoral stem body, wherein the titanium alloy layer adopts a sponge hole structure; walls of holes in the sponge hole structure are made of titanium alloy materials; the holes are distributed in an irregular three-dimensional net-shaped manner in the thickness direction so as to form communicated hole channels. Integration of the artificial joint femoral stem and human body bone tissue is increased, so that looseness between the artificial joint femoral stem and the bone is effectively prevented.

A single use bone cutter comprised of a plate with a plurality of insert blade enclosures is described. The insert blade enclosures are arranged in a spiral pattern about the plate and are further positioned at varying height intervals through the thickness of the plate. The bone cutter provides a means whereby the insert blades can be easily positioned within the plurality of blade enclosures to provide a wide array of cutting diameters.

A method based on the hand-eye robot for locating the center of femur includes calibrating the hand and eye of robot by Tsai method to obtain the their position transform relation, simultaneously moving the far end of femur and the camera fixed to the hand jaw of robot to make the center of fossa intercondyloidea in the vision field of camera in large covered spherical range, acquiring the data about said center and hand jaw state at each position, converting the data to the coordinate system based on robot, fitting the data to a spherical equation, and calculation.