SU1326263A1 - Knee mechanism for shin prosthesis - Google Patents

Abstract

To reduce the trauma of the knee joint when walking, the device-v contains upper 1 and lower 2 bases with fastening elements to hip tires 3 and lower leg 4, a mobile link 5 connected to the bases by means of uniaxial hinges 6 and 7. Base ends 1 and 2 are filled in the form of curvilinear elements 8 and 9, provided with an emphasis 10 against recursion. The relative swing unit of curvilinear elements 8 and 9 does not exceed 15. The upper base 1 is connected to the hip splint 3 by means of a hinge 11. 2 Il. f, (L i-} Flg /

Description

The invention relates to medical, medical engineering, namely prosthesis engineering.

The purpose of the invention is to reduce the trauma of the knee joint when walking.

FIG. 1 shows the knee mechanism of the shank prosthesis at the elevated position of the limb; in fig. 2 - the same, with the knee bent.

The device comprises upper 1 and lower 2 bases with fastening elements to tires 3 of the femur and tires 4 of the lower leg and a movable link 5 connected to the bases by means of single hinges 6 and 7. The ends of the bases 1 and 2 are made in the form of curvilinear elements 8 and 9, fitted with focus

10 Against recursion. The relative swing unit of curvilinear elements 8 and 9 does not exceed 15. Top base 1 is connected to the bus

3 thighs by means of a hinge 11.

The device works as follows.

Tires 3 and 4 are attached to the femoral and tibial parts of the prosthetic leg or orthosis so that the curvilinear elements 8 and 9 and the stop 10 are located at the level of the joint space, and the uniaxial hinges 6 and 7 are on the same vertical straight line. ; her with the line of the resulting net load. In this case, when standing on a straightened prosthesis, the moment of forces relative to the uniaxial hinges 6 and 7 is close to zero, and the direction of the moment relative to the hinge

11 contributes to its locking that

in general, provides resistance to stamina sufficient to use the shank prosthesis. In the n-front push phase, due to the rolling of the curvilinear element 8, movable along the curvilinear element 9, a congruent flexure in the knee joint of the prosthesis through an angle of 15 is provided. In this case, the stop 10 prevents an excessive increase in the angle of the flexure. The movements in the knee joint and the knee joint are kinematically compatible, since they are performed ana-logically - rolling similar profiles along the matching surfaces.

 line of the centers of the arc of a large circle of the oval, approximating the articular surface of the epiphysis of the femoral bone. Rolling the curved elements 8 and 9 of the upper and lower 2 bases and offset posteriorly of the contact point of the femoral and the calf parts of the prosthesis, allows you to maintain the support

the ability of the femoral part in spite of bending in the knee joint reduces the load on the stump due to the force of the weight. The proximity to zero of the moment of forces makes it possible to further expand the prosthesis due to

effort stump, which also reduces the load on it. Rotation around the hinge 11 in the support phase does not occur, because the moment of forces acting on

mechanism aimed at locking.

In the phase of transfer, with an increase in the angle of the lower extremity of the prosthesis with respect to the femoral more than 15, most of the movements are provided by movements of the upper base 1 and the movable link 5 with the lower base 2 around the hinge 11. This provides a range of relative angular displacements of up to 65 in the period of walking and up to 135 when sitting. Rotation around hinges 6 and 7 is kept in the range of 0–15 and plays a trimming (adaptive) role. This achieves the kinematic compatibility of the movements of the mecha- nism and the movements of the knee joint, which significantly reduces the trauma of the cultus.

Invention Formula

The knee mechanism of the lower leg prosthesis containing upper and lower bases with fastening elements to the thigh and shin tires and a movable link connected to the bases by means of uniaxial hinges, so that, in order to reduce knee trauma, joint at. walking, the ends of the bases are made in the form of curvilinear elements that form a rolling pair, the roll angle does not exceed 15, the upper base is connected to the thigh splint hinge.

Editor L.Pcholinsk

Compiled by N.Nikitin

Tehred I.Popovich Proofreader A.Zimokosov

Order 3214 / 3Tirage 595 - Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

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Production and printing company, Uzhgorod, st. Project, 4

FIG. 2

Claims (1)

Claim The knee mechanism of the lower leg prosthesis ^ containing the upper and lower bases with fastening elements to the hip and shin splints and a movable link connected to the bases via uniaxial hinges, so that in order to reduce knee injury joint with. walking, the ends of the bases are made in the form of curvilinear elements forming a rolling pair, and the rolling angle of ¹ does not exceed 15 °, the upper base is pivotally connected to the hip tire. · · A