68 results about "Bone positioning" patented technology

The present invention relates to a clamp, and, more particularly, to a clamp for securing the position of a bone anchor with respect to a longitudinal rod, preferably for use in the spine. The clamp may include a housing, a rod clamping assembly, and a bone anchor clamping assembly. The clamp preferably enables the longitudinal axis of the rod to be offset or laterally displaced from the longitudinal axis of the bone anchor. The rod clamping assembly and the bone anchor clamping assembly are preferably moveably coupled to the housing in order to provide increased flexibility to better accommodate the location and geometry of the longitudinal rod and to better accommodate bone positioning.

A device for positioning a cutting guide with respect to a bone comprising a body forming the cutting guide or intended to be fixed to the cutting guide; a least two contact members intended to freely contact the bone; and adjustment means for individually varying the relative position of the body with respect to each contact member.

A method for positioning a bone cutting guide on a tibia may begin with coupling a bone cut positioning apparatus with a tibia. The method may also include adjusting the positioning apparatus in a varus / valgus orientation to shine a light emitted by a light emitter approximately along a midline of an anterior surface of the tibia, swinging a pivoting arm about a pivot joint to direct the emitted light along a medial surface of the tibia, adjusting the positioning apparatus in an anterior / posterior orientation to shine the light approximately along a midline of the medial surface, contacting a stylus with a proximal end of the tibia to select a cutting depth for a bone cut to be made on the tibia, and attaching the bone cutting guide to the tibia in a position determined by the positioning apparatus.

The present invention proposes a femur positioning method for robotic total knee arthroplasty. First, the problem of determining the center of the femoral head is abstracted into points on a known spherical surface to solve the geometric model of the center of the sphere, and the collected data of the center of the intercondylar fossa are analyzed at any three points. Combination, the coordinate information of the center of the femoral head is determined by the numerical calculation method, and the coordinate information of the highest point of the medial epicondyle, the highest point of the lateral epicondyle and the center of the intercondylar notch are collected to establish the femoral coordinate system, and then the robot coordinate system is lowered to three The unit vectors of the coordinate axes of the femoral coordinate system form a one-to-one correspondence with the unit vectors of the three coordinate axes of the robot coordinate system. Based on this, the corresponding relationship between the robot coordinate system and the femoral coordinate system is solved and established to realize the precise positioning of the femoral part. Utilizing the positioning results of the present invention, a specific operation plan for robot total knee replacement can be designed, and the operation is performed by the robot, which simplifies the operation steps, reduces the complexity of the re-matching algorithm, and reduces the pain of the patient and the operation cost.

The invention discloses a device for rehabilitating functions of an elbow joint of an upper limb after an operation. The device is characterized by comprising an elbow joint bushing, upper arm bone positioning plates, front arm bone positioning plates, a hinge shaft, a function rehabilitator, a longitudinal connecting fabric strap, a transverse connecting fabric strap, positioning airbags, air tubes and an air valve, wherein at least four upper arm bone positioning plates are fixedly arranged on the outer periphery of the upper half part of the elbow joint bushing; at least four front arm bone positioning plates are fixedly arranged on the outer periphery of the lower half part of the elbow joint bushing; the function rehabilitator is arranged on the lateral surface of the elbow joint bushing; and the positioning airbags are arranged between the upper arm bone positioning plates and the elbow joint bushing as well as between the front arm bone positioning plates and the elbow joint bushing respectively, and are communicated with the air valve through the air tubes. Due to the adoption of the structure, the device has the advantages of novel structure, simplicity in use, convenience for operation, high function rehabilitation speed, active exercises, combination of fixation and rehabilitation, and the like.