WO1984000681A1 - Artificial foot - Google Patents

Abstract

In an artificial foot of the structure shown in Fig. 2, the hardness of front and rear elastic units is prepared according to body weight, thereby producing the relationship between the amount of compression and the repulsion force of the elastic units shown by the solid line in Fig. 3, and approximating the motion of the heel when a healthy person walks, as shown in Fig. 1. As shown in Fig. 4, since the foot is tilted slightly downward and the centroid of the body is displaced slightly forward of the heel when standing erect, the amount of compression and the repulsion force provided by the forward elastic units necessary to obtain stability move to the point marked with a dot in Fig. 3. Accordingly, it is better to produce a relationship between compression and repulsion force shown by the broken line to obtain stability when standing erect, and approximate the walking motion of The structure of the foot capable of performing this is as shown in Fig. 5. Stability when standing erect can be obtained by the repulsion force of one front elastic unit (4, 1) compressed from its initial condition, and when the body centroid moves forward from the erect position, the foot is tilted forward from the state in which only the front elastic unit (4, 1) is compressed relatively softly to one in which another front elastic unit (4, 2) is compressed, so that both the front elastic units (4, 1) and (4, 2) are compressed, thereby producing a relatively strong repulsion force and enabling a walk similar to normal walking.

Description

 Specification

 "Title of Invention"

 Prosthesis

 "Technical field"

 Invention concerning the structure of the prosthesis to enable the prosthesis user to walk normally without any inconvenience

 "Background technology" and "Disclosure of device"

 Conventional prostheses have ankle joints to support their weight.]? The anterior part is made of non-elastic material or has a very hard elastic body built in. The bottom could be chosen at an appropriate sharp angle. Therefore, we have developed a prosthetic foot structure to achieve stability when standing upright and normal movement when walking.

 "Brief description of drawings J

 Fig. 1 is an explanatory diagram of changes in the posture of the right body during one cycle of human walking

 Fig. 2 is a diagram for explaining a prosthesis that can accurately approximate the motion of the ankle joint shown in Fig. 1.

 Fig. 3 shows the relationship between the amount of compression of the elastic body and the reaction force shown in Figs. 2 and 5.

 Figure 4 shows the position of the center of gravity when standing upright

 FIG. 5 is a diagram showing an embodiment of the present invention.

 Lower leg 2 · · · Ankle joint ¾

 Back elastic bodyFront elastic body

 Front elastic body 4.2 Front elastic body

 Sole 6

O PI JWA 0 7

 "Best mode for carrying out sprouting"

 In the prosthesis of the present invention, two front elastic bodies are built in the foot part in front of the ankle joint.?, When standing upright, one of the front elastic bodies (4.1) is an elastic body holder (61). In a state where the elastic body is pressed slightly and compressed in advance.], The upward movement of the elastic body holding part is prevented by the stopper (7). In addition, the other front elastic body (4, There is a slight gap between 2) and the elastic retainer.

O PI

 WIPO

Claims

 The scope of the claims

 The prosthesis is connected to the lower leg and foot by the ankle joint axis, and is provided with an elastic body that acts as a human muscle between the lower leg and the foot before and after the axis, and restricts the elastic body from stretching. And attach a stopper to stop the elastic body], and incorporate the front elastic body in a pre-compressed state, or divide the front elastic body into two parts. Prosthesis with one side pre-compressed

OMPI