87 results about "Flexion extension" patented technology

A dynamic spacer is provided for measuring flexion-extension gap during total knee arthroplasty. The dynamic spacer is an improved surgical instrumentation system that it easy to use, simple in construction, and accurately measures flexion-extension gaps under repeatable soft tissue tension. The dynamic spacer generally comprises a first planar member having a lower tissue engaging surface, a second planar member having an upper tissue engaging surface. A tensioner is disposed between the first planar member and the second planar member for applying a tensile force acting upon the first and second planar members. The tensioner is fixedly attached to the first and second planar members, such that the first planar member is held substantially parallel to the second planar member in the absence of compressive load. The dynamic spacer allows for accurately measuring flexion-extension gaps and angular deviation in flexion indicating the appropriateness of femoral rotation.

A prosthetic intervertebral disc includes an upper plate and a lower plate and employs congruent stepped features to provide limited articulating motion between the plates. The stepped features can be used to provide articulating motion of a rocking type rather than a rubbing or translating type of motion provided in many artificial discs. Each of two parts of the intervertebral disc includes two or more stepped bearing surfaces, having curved or flat shapes, which mate with one another to provide the articulation to the disc. The stepped features can be designed to restrict motion in flexion-extension or lateral bending to less than a predetermined angle. The stepped design can be modified to either allow or prevent rotational motion between the plates. The limited motion disc substantially prevents translation, however some limited translation can be provided by modification of the relative sizes of the stepped features.

A device for increasing the range of motion of a patient's knee joint comprising of a longitudinal track frame, having a sitting platform at one end and a movable leg and foot platform at the other end, driven back and forth by a foot actuation mechanism in a flexion-extension motion, linearly along the longitudinal track by an electronically controlled motor in accordance with user defined settings and operable in a passive, active or resistive mode in either a supine or sitting position.

An artificial knee joint including a femoral component to be attached to a femur and a tibial component to be attached to a tibia, wherein in the femur component a medial condyle thereof is thicker than a lateral condyle thereof; in the tibial component, a medial articular surface thereof, which supports the medial condyle of the femur component, is thinner or deeper than a lateral articular surface thereof, which supports the lateral condyle of the femur component; and a joint line joining the lowest points of contact surfaces between the medial and lateral condyles of the femur component and the medial and lateral articular surfaces of the tibial component in a longitudinal cross section in a medial-lateral direction is inclined inward at virtually the same angle over the entire region of an angle of flexion-extension.

A knee brace having adjustment mechanisms that are easy and economical to produce while being very user friendly, and which is more comfortable to wear. The brace has a joint mechanism formed of a plurality of plates with notches, openings and range of motion surfaces, the relative positions of which are used as part of a flexion-extension stop arrangement and also as part of an adjustable locking arrangement by which the brace can be locked, temporarily released or indefinitely released. Furthermore the lateral-medial angulation of the femoral strut is able to be adjusted relative to the joint mechanism and tibial strut.

A hinge system for a knee brace features a flexion-extension regulating device which is adapted to engage an end portion of the knee brace's upper strut. An elongated main slot is formed through the regulating device to provide a fixed boundary for limiting range of motion. A motion limiting member is connected to the regulating device and is further adapted for connection to an end portion of the knee brace's lower strut. The motion limiting member includes a motion limiter that is disposed within the main slot. The motion limiter is caused to move therealong when the upper and lower struts pivot about a user's knee joint. By confining the motion limiter within the fixed boundary formed by the main slot, the hinge system ensures that the user's knee joint flexes and extends within the prescribed range of motion.

A locking intramedullary alignment jig for use in bone resection, especially for the proximal tibial has an axially extending intramedullary rod for insertion into the medullary canal of the tibia. A slidable anchoring block is mounted on the rod for movement along the rod in the axial direction, which on the tibia is the proximal-distal direction. The anchoring block has a pivot point at one end thereof and a tooth portion at a second end thereof. A first rotating body is pivotally coupled to the pivot point on the anchoring block for rotation about a first axis. The rotating body includes a toothed locking member for releasable locking engagement with the toothed portion the anchoring block. A second rotating body, including a bone resection guide is connected to the first rotating body. Movement of the first and second rotating bodies allow rotation of the resection guide in both the flexion-extension and varus-valgus directions.

An interbody fusion implant with deployable bone anchors includes a support member, a monolithic body that accommodates the support member, and a longitudinal hole along a vertical length of the support member. The support member includes a first end and a second end. The second end includes two flanges. The flanges are configured to dig into an endplate of a vertebral body. The flanges of the support member provide a location fixation on an implantation of the interbody fusion implant into the vertebral body. The support member may also include at least one of a clip shaped support member and an I-shaped support member. The I-shaped support member may allow a rigidity and a support in flexion-extension through a living-hinge positioned in a middle of the I-shaped support member. The longitudinal hole sustains loads imported on the interbody fusion implant and allows the interbody fusion implant to flex freely.

The invention discloses an exoskeleton assisting mechanism for a lower limb. The exoskeleton assisting mechanism comprises a waist bearing unit, a thigh unit, a shank unit and a foot unit. The waist bearing unit and the thigh unit are fixed through the connection of an AA connecting piece and a CE connecting piece; the thigh unit and the shank unit are fixed through the connection of a CB connecting piece and a shank regulating rod; and the shank unit and the foot unit are fixed through the connection of a shank swing rod and an ankle joint shaft. The exoskeleton assisting mechanism for the lower limb is a single-leg seven-degree-of-freedom connecting rod bionic mechanism and is driven by three hydraulic mechanisms. In a human walking process, a thigh connecting rod is matched with a flexible coupling of a hip joint to finish flexion-extension motion in a sagittal section under the push of one of the hydraulic mechanisms, a shank connecting rod is matched with a flexible coupling of a knee joint to finish flexion-extension motion in the sagittal section under the push of the other hydraulic mechanisms, and the foot unit finishes flexion-extension motion in the sagittal section around a DC rotating shaft under the push of another hydraulic mechanism.

The invention relates to a vertical type total knee replacement patella movement test device. The vertical type total knee replacement patella movement test device is composed of a supporting structure, a femur movement mechanism, a patella movement mechanism, a tibia movement mechanism and a driving mechanism of the tibia movement mechanism; the supporting structure can realize fixed connection of the test device and movement support of a femur; the movement support is provided by the piston rod of a hydraulic cylinder and is connected with the femur movement mechanism; the femur movement mechanism drives a proximal femur to move up and down and rotate, so that the flexion-extension movement of the femur can be realized; a linkage mechanism of patella and femur movement is adopted, so that patella movement which is coordinated and consistent with the flexion-extension process of the femur can be generated; and the tibia movement mechanism and the driving mechanism thereof are installed at the bottom plate of the supporting structure, and generate flexion-extension movement and self rotation movement of a tibia. According to the vertical type total knee replacement patella movement test device of the invention, the actual movement situation of a replacement prosthesis in the knee of a human being is simulated, so that the movement of the patella can be tested; multiple kinds of movement such as the upward/downward movement of the proximal femur, the flexion-extension movement of the femur, the displacement of patellar ligaments as well as the flexion-extension movement and self rotation movement of the tibia are measured, so that the movement performance of the patella can be obtained.

An artificial knee joint comprises a femoral component a tibial plate slidably receive the femoral component. The femoral component includes medial and lateral condyles, an opening and an elliptical spherical sliding portion are formed therebetween. The elliptical spherical sliding portion couples posterior ends of the medial and lateral condyles, and slides with respect to the tibial plate when flexing the knee joint. The tibial plate includes a medial fossa and a lateral fossa, and a spine and a concave sliding surface are formed therebetween. The spine moves within the opening in an antero-posterior direction in response to flexion-extension action of the knee joint, and comes into contact with the sliding portion when flexing. The concave sliding surface forms a posterior surface of the spine, and slidably receives the elliptical spherical portion. A width of the elliptical spherical sliding portion is widened from the opening toward a posterior end.

Methods and apparatus are disclosed for performing spinal reconstructive surgery, including measuring spinal length in the Y-axis at the middle column, measuring intervertebral spacing in the Y-axis at the middle column, measuring intervertebral tension applied to the posterior longitudinal ligament, establishing the height of intervertebral spacers along the Y-axis at the middle column based on one or more of such measurements, measuring intervertebral rotation around the Y-axis, and measuring flexion-extension or anterior-posterior rotation around the X-axis.

The invention discloses a reconfigurable exoskeleton upper limb rehabilitation robot for different body types. According to the reconfigurable exoskeleton upper limb rehabilitation robot, a shoulder joint internal and external rotation assembly, a scapulohumeral adjustment assembly, a shoulder joint flexion extension and retraction assembly, an upper arm length adjustment assembly, an upper arm rotary motion assembly, an elbow joint flexion and extension assembly, a forearm rotary motion assembly, a forearm length adjustment assembly and a wrist joint flexion and extension assembly are connected in sequence; the robot has six freedom degrees, and six-freedom-degree rehabilitation movement and compound movement of the upper limbs can be achieved corresponding to six active executing mechanisms; a liftable base is suitable for people with different heights; the scapulohumeral adjustment assembly is suitable for rising and sitting postures of different patients; the forearm length adjustment assembly and the upper arm length adjusting assembly are suitable for patients with different forearm and upper arm lengths. The reconfigurable exoskeleton upper limb rehabilitation robot has reconfigurability, multiple passive adjusting mechanisms, a left and right hand interchange using mode, and a light exoskeleton structure, requirements of patients with different disease conditions can bemet, and the treatment cost is reduced.

The invention provides a hand exoskeleton device on the basis of pre-bending elastic wire tube drive. The hand exoskeleton device comprises a thumb movement assembly, a thumb drive assembly, four-finger movement assemblies and a four-finger drive assembly. The thumb drive assembly is rotatably connected to the thumb movement assembly, the thumb movement assembly can be driven by the thumb drive assembly to bend, extend and swing, the four-finger drive assembly is connected to the four-finger movement assemblies, the four-finger movement assemblies can be driven by the four-finger drive assembly to bend and extend, the thumb drive assembly is rotatably connected to the four-finger drive assembly, and the thumb movement assembly and the four-finger movement assemblies are based on the pre-bending elastic wire tube drive. The hand exoskeleton device has the advantage that the hand exoskeleton device can rotate in consistency with flexion-extension and swinging of human fingers and is highin flexibility.

The embodiment of the invention discloses a pressure orthotics device. The pressure orthotics device comprises a knee guard part and a leg guard part, wherein the knee guard part and the leg guard part are of an integral type or a sleeving-wearing type; the knee guard part is woven by three-dimensional knitting, and forms a plurality of functional blocks which are differently stretched in a limb biaxial direction, apply support force or pressure on a knee joint and the periphery thereof, and are seamlessly connected; the leg guard part is woven by three-dimensional knitting, and forms a plurality of pressure blocks which produce pressures decreasing step by step from bottom to top in a lower limb circumference direction, and are seamlessly connected. The pressure orthotics device can be used for preventing and treating lower limb knee pain and chronic venous insufficiency; by means of systemic pressure management, the tensioned state of thigh muscles can be relieved, the knee joint and a flexion-extension angle thereof are controlled and stabilized, and lower limb blood circulation is promoted; besides, the woven blocks of the knee guard part and the leg guard part are respectively seamlessly connected, so the wearing comfort of the pressure orthotics device can be improved.

The invention discloses a load-balanced knee joint orthopedic brace and a 3D printing method thereof. The printing method includes designing and printing of a thigh supporting part, a shank supporting part and a connecting part; both the thigh supporting part and the shank supporting part are represented as an annular curved surface; the connecting part comprises a leg inner side connecting unit and a leg outer side connecting unit; and the designing includes 3D scanning and modeling, manifold, relaxation, offsetting and shelling. The brace disclosed by the invention is simple in structure and reasonable in design, and is capable of preventing further abrasion of a knee joint under a flexion-extension state; and the printing method, which conducts 3D printing by virtue of polylactic acid fiber, has a good physical effect.

The invention relates to a system and method for capturing a hand movement function based on a data glove and a position tracker, relates to the field of hand movement function capturing systems, and aims to solve the problems that the hand movement function is difficult to capture and the existing data glove is difficult to record hand grasping posture data scaling. According to the system and method for capturing the hand movement function based on the data glove and the position tracker disclosed by the invention, hand joint flexion-extension angle information is acquired through the data glove; scaling of the data glove is completed rapidly and accurately through 8-posture data glove scaling experimental paradigms; according to hand movement function experimental requirements, multiple grasping postures of many people for many times can be effectively recorded in combination with wrist position posture data of the position tracker; therefore, the hand movement function capturing accuracy and efficiency are greatly increased; and the system and the method are applied to capturing hand postures.