JPS6240576Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hip joint for a prosthetic leg.

Generally, a prosthesis used by a person who has had their leg amputated at the hip requires a hip joint that can stably support the body's weight and has a rotational axis as a joint, and various hip joints have been devised in the past. There is.

However, conventional hip joint joints are large and difficult to use for people with small bodies, or the hip joint cannot be finely adjusted, making it difficult to create a prosthesis suitable for each user.

The present invention was developed to eliminate the above-mentioned drawbacks of the conventional joints, and it is made smaller by incorporating a coil spring that exerts a restoring force on the joint, and also connects the socket base and hip joint to a spherical contact area. By communicating through the prosthetic leg, the relative angle between the prosthetic leg and the socket for attaching it to the body can be easily fine-tuned, and an adjustment member is also provided to adjust the rotation range of the joint axis. It is characterized by:

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

First, the overall structure of the prosthetic leg will be explained with reference to FIG. Reference numeral 1 designates a hip joint according to the present invention. The hip joint 1 is connected to a known knee joint 3 through a pipe 2, and the knee joint 3 is further connected to a foot 5 through a pipe 4. 6 is a decorative cover made of foamed synthetic resin, and 7 is a socket made of synthetic resin, through which the prosthetic leg is attached to the body.

Next, the configuration of the hip joint 1 of the present invention will be explained with reference to FIGS. 2 to 5. Reference numeral 8 denotes a substantially cylindrical base member, and the upper end of the base member 8 has a pair of support parts 8a, 8.
b is provided protrudingly. Reference numeral 9 denotes a rotating member, one end of which is rotatably attached to the support portions 8a, 8b of the base member 8 by a shaft 10, and a concave portion on the upper surface of the other end of the rotating member 9. 11 is formed, and a hole 12 is bored in the center of the concave portion 11. Reference numeral 13 denotes a substantially bowl-shaped socket base, and the socket base 13 is configured to come into spherical contact with the concave surface portion 11 of the rotating member 9. A disc-shaped abutment member 14 is disposed inside the socket base 13, and a bolt 1 fixed to the center of the abutment member 14 is disposed inside the socket base 13.
5 protrudes outward through a window 13a provided at the center of the bottom of the socket base 13. Further, a bolt 15 protruding from the socket base 13 is inserted into a hole 12 of the rotating member 9, and a nut 16 is screwed into the tip of the bolt 15. Therefore, when the nut 16 is tightened, the peripheral edge of the abutment member 14 presses the socket base 13 toward the concave portion 11 of the rotating member 9, so that the socket base 13 is stably fixed to the rotating member 9 in a state of spherical contact. It's summery. 17
is a connecting plate fixed to the upper opening of the socket base 13. The front and back of the connecting plate 17 are bent appropriately and embedded and fixed in the synthetic resin socket 7, and the socket 7 and the socket base 1 are connected through the connecting plate 17.
3 are connected and fixed. Reference numeral 19 denotes a disk-shaped friction member made of an elastic material. The friction member 19 is disposed inside the socket base 13 between the contact member 14 and the connecting plate 17, and the friction member 19 and the contact member 14 and The frictional force acting between the bolt 15 and the connecting plate 17 prevents the bolt 15 and the contact member 14 from rotating relative to the socket base 13 when the nut 16 is tightened. 20 is a cylinder made of synthetic resin, the upper end of the cylinder 20 is fixed to the base member 8 using a screw portion 8a formed inside the base member 8, and a cap 21 is screwed to the lower end of the cylinder 20. has been done. A piston 22 is slidably fitted into the cylinder 20, and a coil spring 23 is disposed between the piston 22 and the coil spring 23 to exert a restoring force on the joint. It is set to be pressed. 24 is a link piece, and one end of the link piece 24 is attached to the piston 22.
The other end of the link piece 24 extends above and outside the base member 8 and is rotatably connected to the hinge portion 9a of the rotating member 9 by a shaft 26. ing.

Reference numeral 27 denotes an adjusting member made of synthetic resin having a wedge surface 27a, and a window 27b and two elongated holes 27c and 27d are provided in the center of the adjusting member 27 through which the link piece 24 is inserted. 28 is a substantially U-shaped pressure contact member, and bolts 29 and 30 are inserted into the long holes 27c and 27 of the adjustment member 27 with the pressure contact member 28 interposed therebetween.
d, and the adjustment member 27 and the pressure contact member 28 are inserted into the support portion 8 of the base member 8 by the bolts 29 and 30.
It is fixed between a and 8b. In addition, bolt 2
By loosening 9 and 30, the long holes 27c and 27
It is possible to move the adjustment member 27 within a length range of d. Reference numeral 31 denotes a cylindrical buffer member, and the buffer member 31 is locked and fixed to the lower surface of the rotating member 9, and the buffer member 31 is connected to the adjustment member 27.
It is set so as to come into contact with the wedge surface 27a of. Reference numeral 32 denotes a groove provided in the base member 8, and the pipe 2 is fixed to the base member 8 by narrowing the groove 32 with a bolt 33.

Next, adjustment of the hip joint 1 configured as described above will be explained.

When the nut 16 is loosened, the socket base 13 is movable relative to the rotating member 9 along the spherical contact portion. The movement of the socket base 13 is within a certain solid angle range determined by the window 13a of the socket base 13 or the distance between the contact member 14 and the connecting plate 17, and when the socket base 13 is moved, the socket base 13 and the bolt 15 are fixed together. The relative angle with the abutting member 14 changes, and a portion of the friction member 19 is compressed and deformed. Furthermore, when the adjusting member 27 is moved by loosening the bolts 29 and 30, the contact position between the wedge surface 27a and the buffer member 31 changes, and the relative angle between the rotating member 9 and the base member 8 with the shaft 10 as the fulcrum changes. can be adjusted. Therefore, by adjusting the positions of the socket base 13 and the adjustment member 27, the relative position between the socket 7 and the hip joint 1 can be finely adjusted.
It is possible to create a prosthesis that is most suitable for each individual user.

Next, walking with a prosthetic leg using the above hip joint will be explained.

When standing upright, the hip joint 1 is in the state shown in FIGS. 1 to 3, the weight of the user is applied to the prosthetic leg via the socket 7, and the rotating member 9 is rotated around the shaft 10 by the coil spring 23. The buffer member 31 elastically contacts the wedge surface 27a of the adjustment member 27, and the hip joint 1
is inactive. In this state, put your entire weight on the prosthetic leg through the socket 7, move your center of gravity forward in the direction of arrow Q, step out with the other foot, and then, with the prosthetic leg in the air, twist your hips and push the prosthetic leg through the socket 7. When the prosthetic leg is swung forward in the direction of arrow Q, the base member 8, knee joint 3, and foot 5 rotate forward about the axis 10 of the hip joint 1 as a fulcrum against the elastic force of the coil spring 23. . (Relatively, the rotating member 9 rotates in the direction of the arrow R.) Therefore, when the foot 5 rotates to an appropriate forward position, the entire weight is applied to the socket 7, the foot 5 is brought into contact with the ground, and the center of gravity is again adjusted. When you move forward in the direction of arrow Q and step out with your other foot, the elastic force of the coil spring 23 causes the shaft 1 to move forward.
The base member 8 rotates in the opposite direction about 0 as a fulcrum and returns to its original state. Thereafter, by repeating the same actions, the user can walk with the prosthesis.

As is clear from the above description, the hip joint of the present invention is miniaturized by incorporating a coil spring that exerts a restoring force on the joint, and the socket base and the hip joint are connected through a spherical contact part. The socket is connected to the prosthetic leg so that the relative angle between the socket and the prosthetic leg can be easily finely adjusted.The structure also includes an adjustment member that adjusts the rotation range of the joint axis, making it suitable for people with small bodies. In addition, fine adjustment of the hip joint makes it possible to easily create a prosthesis suitable for each user.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the overall configuration of the prosthetic leg. Figures 2 to 5 are views showing a hip joint in an embodiment of the present invention, where Figure 2 is a side view, Figure 3 is a sectional view, Figure 4 is a front view, and Figure 5 is a hip joint. It is a perspective view showing the adjustment member of a joint. Explanation of symbols, 1...Hip joint, 7...Socket, 8...Base member, 9...Rotating member, 10...
Shaft, 11... Concave part, 12... Hole, 13... Socket base, 17... Connection plate, 20... Cylinder, 22... Piston, 23... Coil spring, 24... Link piece, 27... Adjustment Part, 31
...Buffer member.

Claims (1)

[Scope of utility model claims] One end of a rotating member 9 is rotatably attached to the upper end of the substantially cylindrical base member 8 by a shaft 10, and a substantially bowl-shaped socket base 13 fixed to the socket 7 is provided on the upper surface of the rotating member 9. The cylinder 20 is attached to the concave portion 11 so as to be adjustable within a certain solid angle in spherical contact, and a cylinder 20 housing a coil spring 23 that applies a restoring force to the joint is disposed inside the base member 8. A piston 22 that compresses a coil spring 23 is slidably fitted into the rotary member 9 and the piston 22 via a link piece 24.
In addition, the buffer member 31 is fixed to the lower surface of the rotating member 9, and the adjustment member 27 having a wedge surface 27a that contacts the buffer member 31 is adjustably attached to the base member 8, and the adjustment member 27 is attached. It is characterized in that the rotation range of the rotary member 9 is adjusted by changing the position.
Hip joint for prosthetic leg.