SU1498490A1 - Tolacrural unit for prosthesis of the lower limb - Google Patents

Abstract

The ankle prosthesis of the lower limb is designed to provide an anthropomorphic roll across the forefoot. Ankle node contains ankle 1, ankle joint 2, plantar plate 3, the nose part 7 of which is bifurcated for lateral and medial elements having two like roll lines, the distances of which to center of ankle 1 are chosen in accordance with the bionic principle. This allows, when walking, to change the length of the roll lever and to use muscle work rationally. As a result, the biomechanical characteristics of walking are improved. Here, the distance from the center of the ankle 1 to the lateral line of the roll refers to the distance from the center of the ankle 1 to the medial line of the roll as 1: 1.2. 3 il.

Description

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The invention relates to a medical technique, namely to prosthetic lower limbs.

The purpose of the invention is to provide an anthropomorphic roll across the forefoot.

FIG. 1 shows the ankle node of the lower limb prosthesis, general view; in fig. 2 is a diagram of the arrangement of the roll lines on the bottom surface; FIG. 3 - projection of the ankle joint in norm with marked on it.

The ankle assembly contains the ankle tray 1, the ankle joint 2, the frame in the form of a curved hanging plate 3, and an elastic facing 4 with yn-i. The lateral layer of the cord 5. The horizontal plane 6, drawn on the lower surface of the forked toe part 7 of the plantar plate 3, forms it with the medial 8 and lateral 9 elements of the contact zone in the form of the medial 10 and lateral 11 roll lines (shown by a dotted line in Fig. 2). The medial line 10 of the roll perpendicular to the longitudinal O.S. 12 ankles, lateral; on the line 11 of the rolling is located at an angle of 58-62 ° to the longitudinal axis 12 of the ankle 1.

The distance from the center 13 of the ankle 1 to the lateral line 11 of the roll (g) refers to the distance from the center of the 13 ankle 1 to the medial line 11 of the roll (g) as 1: 1.2. The distances from the center 13 of the ankle 1 to the lateral line 11 of the roll (g) and from the center 13 of the ankle 1 to the medial line 10 of the roll are 0.8 times, respectively, from the center of the ankle joint 14 to the inclined axis 15 of the roll (Rj) and from the center of the ankle joint 14 to the transverse axis 16 of the rolling (R) of the metatarsophalangeal articulation of the natural foot in the norm according to the size (Fig. 3):

0.8

It should be noted that, according to biomechanics, the beginning of rolling over the toe section of the natural foot from the moment of the detachment of the heel coincides with the frontal movement of the body, which, in combination with the movement in the ankle joint, causes lateral

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located inclined axis 15 rolling over the metatarsophalangeal joint (Fig. 3). At the same time, from the moment of the detachment of the heel from the support, the body is given a vertically upward directional acceleration, while the posterior group of muscles of the supporting limb is strained, facilitating the work which justifies the expediency of placing the inclined axis of the plus-nephalangeal articulation closer to the center of the ankle joint 14 along relative to the more distant transverse axis 16, the roll relative to which occurs in subsequent phases after a certain amount of movement to the body.

Ankle works as follows.

During the period of reliance on the prosthesis, the load from the overlying part of the body with the prosthesis and inertial forces is transmitted through the ankle 1 and the ankle joint 2

5 on the plantar plate 3 and the elastic lining 4 with a reinforcing cord layer 5. In the initial period of rolling over the forefoot (the toe part 7 of the plantar plate 3) after 30 heals due to one-time movement of the anvil 1 relative to the axis ankle joint 2 and the frontal movement of the body towards the supporting limb, the lateral line 11 rolls over the lateral element 9. sole plate 3. As the amount of movement increases and the body is deflected towards the transferred limbs movement of the front

The foot moves to the medial.

Claims (2)

I line 10 ijepeKaTa medial element 8. Due to the location of the lateral 9 and medial 8 elements of the toe part 7 of the plantar plate 3 opposite to the longitudinal axis 12 of the ankle, a balanced body of the human is rational in the frontal plane. Due to the above ratios of the roll line distances to the center of the ankle 13, it is easier to roll through the lateral and necessary acceleration of the body in the direction of travel when rolling through the medial part of the foot. Walking on prostheses with the proposed ankle unit providing 5 0 0 five It makes it impossible for people with disabilities to relieve effort when rolling through the toe section of an artificial foot, approaching the trajectory to the point where the foot's support reaction applies to normal, increasing the values of the dynamic and kinematic symmetry coefficients. the sole plate is made in the toe part forked on the lateral, and the medial elements having the same roll lines in the contact areas of these elements with the horizontal plane, the medial roll line perpendicular to the longitudinal axis of the ankle, lateral The supply of the lower surface of the elas-u - at an angle of 58-62 to this axis, and Distal from the center of the ankle to the lateral and medial lines of the roll refer to 1: 1.2. 2. The node of the lower extremity according to claim 1, 15 differs in that the distance from the center of the ankle to the medial and lateral lines of the roll is 0.75–0.85 distances from the center of the axis of the ankle joint, respectively, to the transverse and inclined axes of the right phangal joint of the natural foot of the appropriate size. Tricky lining with reinforcing cortex ensures greater durability of the foot. Formula of the invention 1. The ankle prosthesis of the lower limb, which contains the ankle, the ankle joint, the skeleton in the form of a curved sole plate and the elastic lining of the foot, in order to provide an anthropomorphic roll through the forefoot. 1g S y s Figg / 18 one phage.Z