The joint prosthesis

 

(57) Abstract:

The invention relates to protestosterone and can be used in the prostheses of the upper and lower extremities. The joint prosthesis includes a fixed sleeve, a Central axis, a movable sleeve, a roller clutch cage, wheel hub and rollers rotating in opposite directions, the pushers and the lever. It introduced two additional pusher, and all the pushers, and the primary and secondary, with openings for communication with the axes of the rollers, rotating in one direction, and slits to avoid interaction with the axes of the rollers, rotating in the opposite direction. Pushers are paired with each other and with the respective axes rotating in the opposite side of the rollers, the length of which is equal to the width of the hub and mounted on the hub rigidly mounted on the fixed sleeve, on which is mounted a lever. The technical result is the elimination of unbalanced loading, reduction of contact stresses, resulting in reduced weight, increased durability and simplify the design and improve operational properties of the prosthetic joint. 3 Il.

The invention relates to medicine, to protestosterone connect the two parts of the prosthesis with the possibility of rotation of one part relative to another.with. The USSR 995779 class. A 61 F 1/04, 1/06). Such artificial joints have a fixed sleeve, the sliding sleeve, the Central axis and the locking device. However, the locking device they are designed so that the fixation of the movable sleeve relative to the fixed based on the principle of "drafts" one of the other items. This leads to rapid wear of the parts and replace worn-out parts, which is possible only with the complete disassembly of the prosthesis.

This disadvantage is eliminated in the prosthesis joint, in which the fixation is based on the principle of jamming.

The closest technical solution to the proposed invention is a prosthetic joint (RF patent 2118521, class a 61 F 2/54, 2/60), comprising a fixed sleeve, a Central axis, a movable sleeve, a roller clutch cage, wheel hub and rollers rotating in opposite directions, the pushers and the lever. Ferrule rigidly mounted on the fixed sleeve coaxially to the Central axis and on the hub rigidly connected to the movable sleeve, made of two rows of sockets, which are spring-loaded rollers. The slots of each row are directed in opposite directions. On the Central axis with two pusher with tabs for inter the bottom position, the rollers are pushed by their springs into the wedge gap, formed by the yoke and the sockets of the hub. Each row of the rollers prevents rotation in one direction. Thus, the movable sleeve relative to the stationary fixed. For the released plungers are rotated by means of the lever and its protrusions push the rollers of each row of V-slots.

The main drawback of this design is that depending on the direction of the load, or one or the other row of rollers, i.e., for the perception of load half load bearing section of the shroud and hub. Therefore, due to unbalanced loading, required to increase the thickness of the shroud, which leads to an increase in the mass of the prosthesis joint. In addition, the length of the roller is determined by the width of the slot, which may not be greater than half the width of the hub. Consequently, for the perception of contact stresses during operation, requires a greater number of rollers and sockets (because the width of the hub is limited by physiological parameters of the joint). This, in turn, leads to considerable complexity of the design, and its appreciation. In addition, the control lever is located on the movable sleeve. As the thrust control lever is always set to a fixed Gil what about the affects the performance properties of the prosthesis joint.

The technical result of the proposed solution is the elimination of unbalanced loading, reduction of contact stresses, resulting in reduced weight, increased durability, and simplification of the structure, as well as improving the operational properties of the prosthesis joint.

The essence of the proposed technical solution is that in a prosthetic joint, comprising a fixed sleeve, a Central axis, a movable sleeve, a roller clutch cage, wheel hub and rollers rotating in opposite directions, tappets and rocker, introduced two additional pusher, and all the pushers, and the primary and secondary, with openings for communication with the axes of the rollers, rotating in one direction, and slits to avoid interaction with the axes of the rollers, rotating in the other direction, while the pushers are paired with each other and with the respective axes rotating in the opposite side of the rollers, the length of which is equal to the width of the hub and mounted on the hub rigidly mounted on the fixed sleeve, on which is mounted a lever.

In Fig. 1 shows a General view of the prosthesis joint mechanism control lever pushers, installed with one sertraline axis, arm and its control mechanism).

In Fig.3 shows a hub with spring-loaded rollers and plungers.

The joint prosthesis includes a fixed sleeve 1, the Central axis 2, the sliding sleeve 3, a holder 4, is rigidly fixed on the movable sleeve 3 coaxially with the Central axis 2, the hub 5 is mounted on the axis 2 in the holder 4 and is rigidly connected with the stationary sleeve 1 by the bracket 6. On the hub 5 is made surfaces 7, 8, which form the inner surface of the cage 4, the wedge slots 9 and 10 are directed in opposite directions. In the wedge slots 9, 10 mounted rollers 11, 12, which are held there by springs 13. On the rollers 11, 12 is the axis 14. On each side on the hub 5 coaxially to the axis 2 set the main follower 15 and the additional pusher 16.

The main pushers 15 have openings 17 to communicate with the axes of the rollers 12, rotating in one direction, and the slots 18, which prevents the interaction with rollers 11, rotating in the opposite direction. Additional pushers 16 have respective holes 19 to communicate with the axes of the rollers 11 and the slots 20, which prevents the interaction with the rollers 12. The main pushers 15, interacting with the rollers rotating in one direction is s between the axes 21. The axis of the rods 21 and 22 pivotally connected to the axle 23. The axis 23 is installed in the guide groove 24, made in the bracket 6, and cooperates with the lever 25, rotating on the axis 26, fixed to the sleeve 1. The length L of the rollers 11 and 12 equal to the width H of the hub 5.

The prosthesis joint works as follows. In the initial position of the rollers 11 and 12 under the action of springs 13 are pushed into the wedge slots 9, 10, and thereby prevent rotation of the holder 4 relative to the hub 5 in any direction. Thus, the sleeve 3 is fixed relative to the sleeve 1. The lever 25 is exposed relative to the axis 23 in the desired position. Adjusting the position of the lever is effected by means of the control mechanism lever. For the released of the prosthesis joint of the lever 25 is rotated on the axis 26 in a counterclockwise direction. Under the action of the lever 25 the axis 23 is moved in the guide groove 24. This movement of the rods 22 is transmitted to the plungers 15, 16 are rotated in different directions, and their holes 17, 19 output rollers 11, 12 of the V-slits 9, 10, compressing the spring 13. Thereafter, the sleeve 3 freely rotates and is mounted on an axis 2 in any desired position. The lever 25 is released, the spring 13 pushes the rollers 11, 12 in the V-slits 9, 10, translating VI. As the thrust control lever is always installed on the fixed sleeve and the lever is also on the fixed sleeve, the rotation of the movable sleeve relative to the stationary has no effect on the position of the thrust.

A prosthetic joint, comprising a fixed sleeve, a Central axis, a movable sleeve, a roller clutch cage, wheel hub and rollers rotating in opposite directions, the pushers and the lever, characterized in that it introduced two additional pusher, and all the pushers, and the primary and secondary, with openings for communication with the axes of the rollers, rotating in one direction, and slits to avoid interaction with the axes of the rollers, rotating in the other direction, while the pushers are paired with each other and with the respective axes rotating in the opposite side of the rollers, the length of which is equal to the width of the hub and mounted on the hub rigidly mounted on the fixed sleeve, on which is mounted a lever.

 

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FIELD: medical engineering.

SUBSTANCE: device has femur part and crural part connected to each other with rotation mechanism. Braking mechanism, mounted in the knee joint on its axle, has compression unit and unit for controlling the compression force composed of an elastic member and adjusting screw. Threaded hole for receiving the screw is available in one of the parts. The braking mechanism has lubrication unit enveloping the compression unit and is engageable with the axle.

EFFECT: wide range of exoprostheses rehabilitation applications; simplified design; high design reliability.

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FIELD: medical engineering.

SUBSTANCE: device has femur part and crural part connected to each other with restricted rotation mechanism having at least one axle and bearings, braking mechanism having overrunning clutch mounted on axle and enveloped with bushing having slit and screw for controlling overrunning clutch pressure on the part of the bushing. The knee joint additionally has an overrunning clutch identical with the above mentioned, bushing with slit, screw for controlling overrunning clutch pressure on the part of the bushing and lubrication unit as well. Both clutches are back-to-back mounted on axle along permissible direction and the bushings have length being less than clutches length. Each screw for controlling overrunning clutch pressure on the part of the bushing is mounted in a notch on its external surface in perpendicular to bushing axis and intersects slit, and the threaded openings for receiving the screws are produced in body of one of knee joint part. Elastic member is arranged between screw head and bushing. The member surrounds the screw and the lubrication unit envelopes the bushings and is engageable with external surfaces of the overrunning clutches.

EFFECT: improved comfort conditions; reduced patient power consumption when walking.

6 cl, 5 dwg

FIELD: medical engineering.

SUBSTANCE: device has femur part having supporting member for fastening and controllably rotating prosthesis bucket and fixing members; crural part having supporting member for fastening crus mounted on rotation axle. The prosthesis bucket supporting member is mounted in a way allowing rotation about symmetry axis and has cylindrical tail part having ring-shaped groove. The fixing means are manufactured as two pairs of threaded boss-bushing type arranged in parallel when passing through openings in the femoral part on both sides of the ring-shaped cylindrical tail part groove. They have rims pressed with screws to ring-shaped groove surface. The bosses have sharp edges and are positioned on the same side with one lateral casing surface and the bushings having rounded edges are arranged on the opposite side. Compression spring is mounted between each threaded boss and bushing.

EFFECT: improved rotation conditions with any type of supporting members without taking off the prosthesis bucket.

6 cl, 4 dwg

FIELD: medical engineering.

SUBSTANCE: device has femoral part having modular mount of femoral prosthesis bucket and crural part having crural fastening members mounted on rotation axis and locking mechanism having spring-loaded latch and socket having cylindrical surfaces. A socket is an extended member one end of which is mounted on an additional axle arranged in parallel to the rotation axis and fixed in the femoral part. The other end has cylindrical surface is spring-loaded towards locking side. Compression spring is mounted in the femoral part. Radii of the cylindrical latch surface R1 and of the socket R2 satisfy the following conditions R1 = 0.3-0.5 R; R2 = 0.7-0.9 R, where R is the distance from cylindrical surfaces contact line to latch rotation axis. Plane passing through the cylindrical surfaces contact line and latch rotation axis makes angle of α with plane being in perpendicular relation to cylindrical surfaces and passing through their contact line, The angle satisfies condition of 0≤α<0.4ϕ, where ϕ is the friction angle between the contacting surfaces.

EFFECT: enhanced effectiveness in locking a joint without backlash regardless of friction wear of its surfaces.

5 cl, 5 dwg

FIELD: medical engineering.

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EFFECT: prolonged service life; operation reliability.

34 cl, 51 dwg

FIELD: medical engineering.

SUBSTANCE: method involves measuring instantaneous axial force and moment magnitude, and knee angle value of prosthesis knee. Automatic shock absorption adjustment is carried out on basis of instantaneous data read from transducers and relations binding transducer data and shock absorption in standing phase determined in clinical studies on people having one leg lost and various body dimensions saved in computer memory. Prosthesis foot and ground contact time is continuously measured for each period observed during one walking cycle when carrying out adaptive prosthesis knee shock absorption control. The contact time is saved in computer memory in temporary windows conforming to patient locomotor speed. Iterative shock absorption modulation is carried out in walking phase for straightening knee with patient movement speed. Shock absorption values are used for automatically controlling shock absorption in walking phase at all locomotor speed magnitudes. The prosthesis knee has knee drive, transducers for measuring force and moment applied to the prosthesis knee, controller having memory and capable of sending command signals to the knee drive and receiving input signals from transducers. The knee drive is designed as magnetic rheological brake operating in shift mode. The prosthesis unit has prosthesis knee, recess for receiving stump, prosthesis shin part and prosthesis foot subjected to mechanical binding.

EFFECT: high accuracy and exactness in controlling prosthesis knee in wide range of locomotor parameter values.

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FIELD: medical equipment.

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EFFECT: improved functionality; high degree of bending at standing position; restricted second degree of freedom of movement.

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EFFECT: reduced number of compensatory motions; simplified design; reduced cost.

4 dwg

FIELD: medicine; orthopaedics.

SUBSTANCE: orthopaedic auxiliary unit contains mutually mobile parts (15, 16) and fixation blocking both parts (15, 16) in preset relative position and unblocking parts (15, 16) to provide their mutual mobility. Fixation is electromechanically actuated by control box (8, 8'). Actuation signal is wireless transferred by actuating unit (9', 14) to control box (8, 8').

EFFECT: invention provides simplification of appropriate unblocking.

FIELD: medicine; orthopaedics.

SUBSTANCE: orthopaedic auxiliary unit contains mutually mobile parts (15, 16) and fixation blocking both parts (15, 16) in preset relative position and unblocking parts (15, 16) to provide their mutual mobility. Unit is equipped with at least one indicator (36, 40, 41, 42) which generates proper characteristic or warning signal of blocking or unblocking of fixation.

EFFECT: prevented traumatism associated with operation of orthopaedic auxiliary unit due to incomplete mutual blocking of unit parts.

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