JP2003250823A - Prosthetic leg - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a prosthetic leg which allows a user to match a prosthetic foot part with clothes, to change the prosthetic foot part depending on a walking place, walking conditions, and exercise conditions, and to attach and detach the prosthetic foot part to and from a prosthetic lower thigh part easily without using a special tool. <P>SOLUTION: The prosthetic leg is provided with an attachable and detachable joint 4 to connect the prosthetic lower thigh part 1 and the prosthetic foot part 2 at a prosthetic ankle part 3 on the prosthetic ankle part 3. the joint 4 comprises a pair of main bodies 4a, 4b of the connection with the same structure. The proximal end of the main body 4a of the connection is connected to the prosthetic lower thigh part 1, and the proximal end of the other main body 4b of the connection is connected to the prosthetic foot part 2. A plurality of mating protrusions, aligned in the circumferential direction of the front end surfaces of the pair of the main bodies 4a, 4b and protruding in the axial direction, and a plurality of dented parts for mating formed between the mating protrusions are provided on the front end surfaces of the main bodies 4a, 4b. The mating protrusions and the dented parts for mating on a main body 4a, 4b mate with them on the other main body mutually in the axial direction. The mating protrusion has a hooking part for catching which regulates movements in the axial direction by catching on the mating protrusion on the other main body of the joint in the circumferential direction and catches the pair of the main bodies of the joint in the axial direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prosthesis in which a lower leg of a prosthesis and a prosthetic foot are detachably connected by a joint of a prosthetic foot by a joint.

[0002]

2. Description of the Related Art In recent years, the prosthesis has been improved, and when it is worn by a person with a disability on his / her foot, he / she can walk in a state close to normal, and in addition to walking, he / she can run and jump. Possible high performance prostheses have been developed.

FIGS. 9A and 9B show a conventional artificial leg,
The prosthetic lower leg part a and the prosthetic foot part b are detachably connected by a prosthetic foot joint part c. A joint d is used for the artificial leg ankle joint portion c, and the joint d is provided with an upper connecting member f having a plurality of bolt holes e. Further, the upper connecting member f is provided with a fitting hole h into which the lower connecting member g is fitted. Then, the lower connecting member g is fitted into the fitting hole h, and the bolt hole e
By inserting the hexagon socket head cap bolt i into the screw and screwing the bolt i, the tip of the bolt i is fastened to the lower connecting member g, and the artificial leg leg a and the artificial leg foot b are connected via the joint d. ing.

[0004]

However, in the conventional prosthesis, the prosthesis lower leg portion a and the prosthesis foot portion b are connected via the joint d by a plurality of hexagon socket head bolts i, so that the prosthesis foot is provided. When attaching / detaching the part b, it is necessary to loosen or tighten the plurality of hexagon socket head bolts i one by one with a dedicated tool such as a hexagon wrench, and the attaching / detaching operation is troublesome. Moreover, the hexagon socket head cap screw i may be gradually loosened due to vibration, impact, etc. during walking, and it is necessary to firmly tighten it. On the other hand, although the artificial leg lower leg part a and the artificial leg part b are connected via the joint d, the artificial leg part b has the shape,
There is only one type of material and heel height. Therefore, there is no known one that can satisfy the demand for changing the artificial leg foot b according to clothes, walking place, walking condition, and exercise condition. The present invention has been made in view of the above circumstances, and an object thereof is to easily attach and detach the artificial leg lower leg and the artificial leg foot, and to fit the artificial leg foot to clothes or shoes, and to walk. It is to provide a prosthesis that can be changed depending on the place, walking condition, and exercise condition.

[0005]

In order to achieve the above object, the present invention provides a prosthetic ankle joint for connecting a prosthetic leg lower leg and a prosthetic foot with a prosthetic ankle joint. In a prosthesis provided with a detachable joint in the section, the joint is composed of a pair of joint bodies having the same structure, the proximal end of one joint body is connected to the leg of the artificial leg, and the base of the other joint body. An end portion is connected to the artificial leg portion, and a plurality of fitting protrusions arranged in the circumferential direction on the front end faces of the pair of joint main bodies and protruding in the axial direction, and a fitting recess formed between them. Equipped with
The fitting protrusion and the fitting recess of the pair of joint bodies are axially fitted to the fitting recess and the fitting protrusion of the mating joint body on the other side,
In addition, these fitting projections are provided with locking hooks that are circumferentially locked to the fitting projections of the mating joint body to restrict axial movement and lock the pair of joint bodies in the axial direction. It is characterized by being formed. According to a second aspect of the present invention, an urging mechanism that urges an elastic force in the circumferential direction is provided on a side surface of the fitting protrusion of the first aspect opposite to the locking hook portion.
It is characterized in that the joint main bodies are detachably connected to each other by the engagement of the locking hook portions with each other and the elastic biasing force of the biasing mechanism. According to a third aspect of the present invention, the joint of the first aspect comprises a joint body made of a pair of synthetic resin materials having the same structure, and an elastic force is applied to a side surface of the fitting protrusion opposite to the locking hook in the circumferential direction. An urging mechanism for urging is provided, and the joint main bodies are detachably coupled with each other by the engagement of the locking hooks with each other and the elastic urging force of the urging mechanism. A fourth aspect of the present invention is that the prosthetic foot portion according to claim 1, 2 or 3 comprises a plurality of types of prosthetic foot portions having different shapes and a prosthetic foot portion provided with an elastically deformable member in a vertical direction with respect to a ground plane, It is characterized in that the artificial leg part can be attached to and detached from the lower leg part of the artificial leg.

According to a fifth aspect of the present invention, the connecting portion between the lower leg of the artificial leg and the joint according to any one of the first to fourth aspects is engaged with each other and twisted about the axis of the joint. It is characterized in that a receiving member for receiving a bending moment is provided.

According to a sixth aspect of the present invention, the joint according to any one of the first to fourth aspects receives the torsional moment about the axis of the joint body, so that the artificial leg is provided separately from the joint body. It is characterized in that a connecting member for connecting to the foot portion is provided.

According to a seventh aspect of the present invention, in the artificial leg in which the artificial leg joint part is provided with a detachable joint in order to connect the lower leg part of the artificial leg and the artificial leg part with the artificial leg joint part, the joint part is a male side. A joint and a female joint, one of the male joint and the female joint has one proximal end connected to the artificial leg leg, the other proximal end connected to the artificial leg, the male side The fitting and the female joint have a fitting tubular portion that fits with each other, the fitting tubular portion of the male joint is provided with a fitting groove, and the fitting tubular portion of the female fitting is fitted into the fitting groove. And a means for preventing the male side joint and the female side joint from being pulled out. According to the above configuration, even a person with a foot disorder can match the prosthesis foot with clothes, and can change the foot depending on the walking place, walking condition, and exercise condition, and moreover, the leg and leg of the prosthesis and the prosthesis foot can be combined. It can be easily attached and detached without using a special tool. In addition, the joint is formed in a cylindrical shape, so that it is easy to receive a torsion moment about the axis of the joint while walking, but the rigidity is increased by providing the receiving member that receives the torsion moment described above. Can be achieved.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment, and FIG.
Indicates a prosthesis, and the leg part 1 and the leg part 2 of the prosthesis are detachably connected to each other by a joint 4 provided on the joint part 3 of the leg. A knee joint portion 5 is provided at an upper end portion of the artificial leg lower leg portion 1, and a joint portion 6 with one joint body 4a is provided at a lower end portion thereof. Further, the prosthetic foot part 2 cushions a first prosthetic foot part 2a having a flat sole such as a sneaker, a second prosthetic foot part 2b having a high heel such as high heels, and a shock when exercising. CFR on the ankle and arch
The third artificial leg portion 2c is provided with the elastically deformable member 7 made of P (carbon fiber reinforced plastic).

On the upper part of the prosthetic foot part 2 (prosthetic foot joint part), there is provided a connecting part 8 with the other joint body 4b.
Then, by connecting the joint bodies 4a and 4b,
The artificial leg lower leg part 1 and the artificial leg foot part 2 are joined by the artificial leg ankle joint part 3 and the joint main bodies 4a and 4b are released from each other, so that the artificial leg lower leg part 1 and the artificial leg foot part 2 are joined together. It can be separated in part 3.

The prosthetic foot portion 2 includes a first prosthetic foot portion 2a and a second prosthetic foot portion 2a.
By preparing a plurality of types such as the artificial leg part 2b and the third artificial leg part 2c, it is possible to match the clothes and shoes and change the shoes depending on the walking place, walking condition, and exercise condition. The type of the prosthetic foot portion 2 is not limited to the above-mentioned embodiment, and the material, color, design, etc. may be changed and further increased. Next, regarding the joint 4, FIG.
~ It demonstrates based on FIG. The joint 4 is made of metal such as aluminum, and has a pair of joint bodies 4a and 4b having the same structure.
And a coupling receiving portion 9a such as a female screw that is coupled to the coupling portion 6 of the artificial leg lower leg portion 1 is provided at the proximal end portion of the one coupling body 4a, and the proximal end of the other coupling body 4b. The portion is provided with a coupling receiving portion 9b such as a female screw that is coupled to the coupling portion 8 of the artificial leg and ankle joint portion 2.

Each of the joint main bodies 4a and 4b is provided with a cylinder main body 10. The cylinder main body 10 has a substantially cylindrical shape, and a cylindrical abutting member 11 is provided on the inner circumference thereof. Therefore, when the joint main bodies 4a and 4b are fitted and coupled to each other in the axial direction, the abutting members 11 are abutted against each other, and the cylinder main bodies 10 are
Keeps the inside of the unit connected.

A plurality of, for example, six fitting protrusions 12 are integrally provided on the front end of the cylinder body 10 so as to integrally project. These fitting projections 12 are arranged at equal intervals in the circumferential direction and project in the axial direction from the abutting surface of the abutting member 11. A fitting recess 13 is formed between the fitting protrusions 12, and the fitting main body 4 is provided.
When a and 4b are abutted against each other in the axial direction, the fitting protrusion 12 of one joint body 4a fits into the fitting recess 13 of the other joint body 4b, and Mating protrusion 1
2 fits in the fitting recess 13 of the one joint body 4a, and fits in a complementary shape to each other.

In the first embodiment, the width of the fitting recess 13 is slightly wider than the width of the fitting projection 12. Therefore, the fitting projections 12 are fitted in the fitting recesses 13 in the axial direction and are rotatable in the circumferential direction by a predetermined amount.

A stepped hook-shaped locking hook 14 is formed on one side surface of the fitting protrusion 12, and these hooks 14 engage with each other on the mating protrusion 12 on the other side. Is configured to engage in the circumferential direction. Therefore, in a state where the fitting protrusions 12 are axially fitted in the mating fitting recesses 13, the joint bodies 4a and 4b are rotated relative to each other and one side surface of the fitting protrusions 12 is rotated. When the two are close to each other, these locking hooks 14 are engaged with each other as shown in FIG.
Are connected to each other.

A curved portion 15 is formed at the root of each of the locking hooks 14 to prevent stress concentration at this portion. The tip corners of the other side surface of these fitting protrusions 12 are formed in an arc shape to form guide portions 16, and when these are fitted, these guide portions 16 contact each other. Contact.

A biasing mechanism 17 is provided on the other side surface of each of the fitting projections 12. These urging mechanisms 17 include a urging member such as a steel ball 19 housed in a cylindrical case member 18 so as to project and retract, and the steel ball 1.
9 and a spring 20 for urging 9 in the protruding direction, and these urging mechanisms 17 are embedded in the other side surface of these fitting projections 12. Therefore, when these fitting protrusions 12 are fitted in the mating fitting recesses 13 as shown in FIG. 4, the steel balls 19 abut against each other and press and urge each other. The other side surfaces of 12 are biased away from each other, and as a result, the one side surfaces of these fitting projections 12 are biased toward each other, and the locking hook portions 14 of these one side surfaces are mutually biased. It is biased into engagement.

Next, the operation of the joint 4 will be described. When connecting the joint bodies 4a and 4b, as shown in FIG. 2, the joint bodies 4a and 4b are made to face each other in a substantially concentric manner, and they are abutted in the axial direction so that the fitting protrusions 12 are opposed to each other. It fits in the fitting recess 13 on the side. In this case, all the fitting protrusions 12 have the same shape, and since six fitting protrusions 12 are arranged at equal intervals, these fitting protrusions 12 fit with any mating recesses 13 on the other side. be able to. Therefore, in order to make these fitting protrusions 12 and the mating fitting recesses 13 face each other, these fitting bodies 4 can be joined by up to about 30 °.
The operation is easy because it is only necessary to relatively rotate a and 4b.

When these are fitted in the axial direction, the tip ends of one side surface of the fitting projection 12 come into contact with each other,
The gap between the other side surfaces is reduced. However, since the guide portion 16 is formed at the tip corner portion of the other side surface, the arc-shaped guide portions 16 abut each other and smoothly guide each other. It is possible to prevent the tip of the collision portion 12 from being caught. Then, when the fitting projection 12 is fitted in the axial direction in this manner, the biasing mechanism 10 provided on the other side surface of the other.
Steel balls 19 of the above press each other, and urge the fitting projections 12 so that one side surfaces of the fitting projections 12 approach each other. When the locking hooks 14 formed on one of the side surfaces pass over the tips of the other, the locking hooks 14 are circumferentially moved relative to each other by the urging force of the urging mechanism 17, as shown in FIG. To make it impossible to move in the axial direction, and in this state, the pair of joint bodies 4a, 4b are joined. That is, the prosthetic leg 1 and the prosthetic leg 2 are joined by the joint 4.
Next, when releasing the joint bodies 4a and 4b in the coupled state, the joint bodies 4a and 4b are grasped by both hands and twisted in opposite directions. As a result, the joint bodies 4a, 4b rotate against the urging force of the urging mechanism 17, and the engagement of the engagement hook portion 14 in the engagement state is released.
Then, if the joint bodies 4a and 4b are pulled apart from each other in the axial direction together with them, the coupling is released. That is, the prosthetic leg 1 and the prosthetic foot 2 are uncoupled at the joint 4. According to the above-described embodiment, for example, when performing a light exercise such as a walk, the first sole having a flat sole such as a sneaker.
The joint body 4b of the artificial leg portion 2a can be joined to the joint body 4a. In addition, the joint body 4b of the second prosthetic foot portion 2b having a high heel such as high heels depending on the clothes worn by the woman.
Can be connected to the joint body 4a. Further, the joint body 4b of the third artificial leg portion 2c, which is capable of cushioning and running when moving, can be coupled to the joint body 4a. The third prosthetic foot portion 2c has elastic deformation members 7 made of CFRP (carbon fiber reinforced plastic) provided at the ankle portion and the arch portion, and therefore has cushioning properties against the ground contact surface, so that it can run or jump. Even so, the burden on the knee joint part 3 is reduced.

As described above, even a person with a leg disorder can wear the prosthetic foot 2 according to clothes, and can switch the prosthesis 2 according to the walking place, the walking condition, and the exercise condition, and the prosthetic leg 1 and the prosthetic foot. There is an effect that the part 2 can be easily attached and detached without using a special tool. 5 and 6 are the second
In this embodiment, a joint 24 integrally formed of a synthetic resin material is adopted for connecting the leg part 1 of the artificial leg and the leg part 2 of the artificial leg. The joint 24 is composed of a pair of joint main bodies 24a and 24b having the same structure, and the base end of one joint main body 24a is a joint receiving portion 29a which is joined to the joint portion 6 of the prosthetic lower leg 1. And a coupling receiving portion 29b that is coupled to the coupling portion 8 of the prosthetic ankle joint portion 2 is provided at the base end portion of the other joint body 24b.

Each of the joint bodies 24a and 24b is provided with a cylinder body 30 having a substantially cylindrical shape. A plurality of, for example, three fitting protrusions 3 are provided on the front end of the cylinder body 30, respectively.
2 is integrally projected. These fitting protrusions 32 are
They are arranged at equal intervals in the circumferential direction. A fitting recess 33 is formed between the fitting protrusions 32.
When these joint bodies 24a and 24b are abutted against each other in the axial direction, the fitting protrusion 32 of one joint body 24a fits into the fitting recess 33 of the other joint body 24b, and the other one. The fitting protrusion 32 of the joint body 24b is one joint body 24
They are fitted in the fitting recess 33 of a and are fitted in a complementary shape to each other.

In the second embodiment, the width of the fitting recess 33 is slightly wider than the width of the fitting protrusion 32. Therefore, the fitting protrusions 32 are fitted in the fitting recesses 33 in the axial direction and are rotatable in the circumferential direction by a predetermined amount.

A stepped hook-shaped locking hook 34 is formed on one side surface of the fitting projection 32. The locking hooks 34 of the mating projection 32 on the other side are formed with each other. Is configured to engage in the circumferential direction. Therefore, in a state in which these fitting protrusions 32 are fitted in the mating fitting recesses 33 in the axial direction, the joint bodies 24a and 24b are rotated with respect to each other to one side surface of the fitting protrusions 32. When they come close to each other, these locking hooks 34 engage with each other as shown in FIG.
a and 24b are connected to each other. In addition, the tip corners of the other side surface of these fitting protrusions 32 are formed in an arc shape to form guide portions 36, and when these are fitted, these guide portions 36 contact each other. Contact.

A biasing mechanism 37 is provided on the other side surface of each of the fitting protrusions 32. These urging mechanisms 37 extend from the tip end to the root of the side surface of the fitting projection 32 opposite to the locking hook 34, and are elastically deformable in the circumferential direction of the tube body 30. Elastic arm 38
Are provided, and the convex portions 39 protruding laterally are provided at the tip ends of these elastic arm portions 38.

Therefore, when these fitting projections 32 are fitted into the mating fitting recesses 33 as shown in FIG. 6, the projections 39 of the elastic arms 38 come into contact with each other and press them against each other. Biasing the other side surfaces of the fitting protrusions 32 away from each other, and as a result, the one side surfaces of the fitting protrusions 32 are biased toward each other. The engaging hook portions 34 of are urged to engage with each other.

Next, the operation of the joint 24 will be described. When connecting the joint bodies 24a and 24b, as shown in FIG. 5, the joint bodies 24a and 24b are opposed to each other in a substantially concentric manner, and they are abutted in the axial direction so that the fitting protrusion 32 is opposed to the mating protrusion 32. It fits in the fitting recess 33 on the side. In this case, all the fitting protrusions 32 have the same shape, and since three fitting protrusions 32 are arranged at equal intervals, these fitting protrusions 32 fit into any mating recesses 33 on the mating side. be able to. Therefore, in order to make the fitting protrusion 32 and the mating fitting recess 33 face each other, it is only necessary to relatively rotate the joint bodies 24a and 24b by about 60 ° at the maximum, and the operation is easy. is there.

When these are fitted in the axial direction, the tips of one side surface of the fitting projection 32 come into contact with each other,
The gap between the other side surfaces is reduced. However, since the guide portion 36 is formed at the tip corner portion of the other side surface, the arc-shaped guide portions 36 abut each other and smoothly guide each other. It is possible to prevent the tip of the collision portion 32 from being caught. Then, when the fitting protrusion 32 is fitted in the axial direction in this manner, the biasing mechanism 30 provided on the other side surface of the other.
The convex portions 39 of the two press each other, and urge the one side surfaces of the fitting protrusions 32 to approach each other. When the locking hooks 34 formed on one of the side surfaces pass over the tips of the other, the locking hooks 34 are circumferentially moved by the urging force of the urging mechanism 37, as shown in FIG. , So as to be immovable in the axial direction, the pair of joint bodies 24a and 24b are joined together in this state.

Next, the joint bodies 24a, 2 in the coupled state
When uncoupling 4b, these joint bodies 24a,
24b is gripped with both hands and twisted in opposite directions. As a result, the joint bodies 24a and 24b are connected to each other by the urging mechanism 3
Locking hook part 3 in a locked state by rotating against the biasing force of 7
4 is released. Then, if the joint bodies 24a and 24b are pulled apart from each other in the axial direction together with these, the joints are released.

According to the second embodiment, the same effect as that of the first embodiment can be obtained, and since the joint 24 is integrally molded with the synthetic resin material, the weight of the artificial leg itself can be reduced and the walking can be performed. There is an effect that it is easy and structurally simple and can be provided at a low price. FIG. 7 shows a third embodiment, in which a joint 4 for connecting the leg part 1 of the artificial leg and the leg part 2 of the artificial leg is provided with a receiving member for receiving a torsion moment about the axis of the joint 4. It is a thing. That is, in FIG. 7 (A), a pair of protrusions 40 are symmetrically provided on the outer peripheral portion of one joint body 4a so as to be symmetrical about the axis of the joint body 4a. These protrusions 40 project to the front end side from the joint surface of the joint body 4a. Further, an engaging recess 41 is provided by a pair of protrusions at a position corresponding to the protrusion 40 on the outer peripheral portion of the other joint body 4b. When the joint bodies 4a and 4b are joined together, the projection 40 engages with the engagement recess 41 and receives a twisting moment about the axis of the joint 4.

In FIG. 7B, a base end of a substantially L-shaped connecting member 42 is connected to one joint body 4a separately from the joint body 4a. The tip of this connecting member 42 projects toward the upper surface of the artificial leg portion 2, and a fitting recess 43 is provided at the lower end thereof. In addition, a fitting convex portion 44 that fits into the fitting concave portion 43 is provided on the upper surface of the artificial leg portion 2 in a protruding manner. When the joint bodies 4a and 4b are joined together, the fitting recess 4
3 is fitted with the fitting convex portion 44, and is configured to receive a torsion moment about the axis of the joint 4.

According to the present embodiment, the joint 4 is formed in a cylindrical shape, and the structure is apt to receive a torsion moment about the axis of the joint 4 during walking. The rigidity can be increased by providing the receiving member that receives the above. FIG. 8 shows a fourth embodiment and shows a male-female type joint 45. That is, the joint 45 includes a male joint 45a and a female joint 45b. The male side joint 45a is provided at its proximal end with a joint 46 with the leg part 1 of the artificial leg. Male side joint 45a
At the tip end of the fitting cylindrical portion 47 fitted with the female side joint 45b
Is provided, and a fitting groove 48 is provided in the middle portion.

A coupling portion 49 for coupling the artificial leg portion 2 is provided at the base end portion of the female joint 45b. At the tip of the female joint 45b, there is provided a fitting cylinder portion 50 that is fitted to the outer circumference of the fitting cylinder portion 47 of the male joint 45a. A plurality of ball holes 51 are provided in the circumferential direction on the front end side of the fitting tubular portion 50, and balls 52 as retaining means are provided in the ball holes 51 so as to project and retract in the radial direction.

Further, a sleeve 53 which is movable in the axial direction is fitted on the outer peripheral portion of the fitting tubular portion 50. The sleeve 53 is biased in the tip direction by a spring 54, and when the spring 54 advances, the ball 5
2 is pushed inward in the radial direction of the fitting tubular portion 50. Therefore, the sleeve 53 of the female side joint 45b is connected to the spring 5
4, the fitting cylinder portion 50 is fitted into the fitting cylinder portion 47 of the male joint 45a. In this state, when the fitting tubular portion 50 is fitted further deeply into the fitting tubular portion 47 of the male side joint 45a, the balls 52 are fitted into the fitting groove 4 of the male side joint 45a.
Face 8 Then, when you release your hand from the sleeve 53,
The sleeve 53 advances by the biasing force of the spring 54, and the sleeve 53 presses the ball 52 inward in the radial direction of the fitting tubular portion 50. Therefore, the ball 52 fits in the fitting groove 48, and the male side joint 45a and the female side joint 45b are prevented from coming off. On the contrary, when the male side joint 45a and the female side joint 45b are separated, if the sleeve 53 is retracted against the urging force of the spring 54, the ball 52 retreats outward in the radial direction of the fitting tubular portion 50. It becomes possible, and the female side joint 4 is compared with the male side joint 45a.
When 5b is pulled out, the ball 52 is released from the fitting groove 48 and the engagement is released, so that the male joint 45a and the female joint 45b can be separated.

Therefore, according to this embodiment, there is an effect that the artificial leg lower leg portion 1 and the artificial leg foot portion 2 can be easily attached and detached without using a special tool.

[0036]

As described above, according to the present invention, even a person with a foot disorder can change his or her prosthetic foot according to clothes, and change his / her clothes depending on the walking place, walking condition, and exercise condition. Moreover, there is an effect that the artificial leg lower leg and the artificial leg can be easily attached and detached without using a special tool.

[Brief description of drawings]

FIG. 1 is a perspective view of a prosthesis showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the joint of the same embodiment.

FIG. 3 is a side view showing a cross section of one side of the joint of the same embodiment.

FIG. 4 is a partially cutaway lower side view showing the joint urging mechanism of the same embodiment.

FIG. 5 is a side view of the joint according to the second embodiment of the present invention in a separated state.

FIG. 6 is a side view of the connection state of the joint of the same embodiment.

FIG. 7 shows a third embodiment of the present invention, (A)
(B) is a perspective view of the artificial leg.

FIG. 8 is a vertical sectional side view showing a joint according to a fourth embodiment of the present invention in a separated state.

9A and 9B show a conventional artificial leg, in which FIG. 9A is a perspective view and FIG. 9B is a vertical side view of a joint.

[Explanation of symbols]

1 ... Prosthesis Lower leg 2 ... Prosthetic leg 3 ... Prosthetic ankle joint 4 ... Fitting 4a, 4b ... Joint body 12 ... Mating protrusion 13 ... Fitting recess 14 ... Engaging hook

Continued front page    (72) Inventor Tetsuya Nakamura             1-21-17 Sasazuka, Shibuya-ku, Tokyo             Within the corporation (72) Inventor Akira Horimoto             1-21-17 Sasazuka, Shibuya-ku, Tokyo             Within the corporation (72) Inventor Makoto Kawakatsu             1-21-17 Sasazuka, Shibuya-ku, Tokyo             Within the corporation F-term (reference) 4C097 AA02 BB02 CC01 CC14 TA08

Claims (7)

[Claims] 1. A prosthesis provided with a detachable joint in the prosthetic ankle joint in order to connect the prosthesis lower leg and the prosthetic foot in the prosthetic ankle joint, wherein the joint comprises a pair of joints having the same structure. The joint main body, the proximal end of one joint main body is connected to the artificial leg leg, the proximal end of the other joint main body is connected to the artificial leg, the front end surface of the pair of joint main body. A plurality of fitting projections arranged in the circumferential direction and projecting in the axial direction and a fitting recess formed between them are provided, and the fitting projections and the fitting recesses of the pair of joint bodies are opposed to each other. Axially fits into the fitting recesses and fitting projections of the joint body of the above, and these fitting projections are circumferentially locked to the fitting projections of the mating joint body to move in the axial direction. A prosthetic foot, characterized in that a locking hook portion is formed to restrict the pair of joint bodies in the axial direction. 2. A biasing mechanism for biasing an elastic force in a circumferential direction is provided on a side surface of the fitting protrusion opposite to the locking hook, and the fitting hooks are engaged with each other in the joint main body. The artificial leg according to claim 1, wherein the joint bodies are detachably connected to each other by the elastic biasing force of the biasing mechanism. 3. The joint is composed of a pair of joint bodies made of a synthetic resin material having the same structure, and is provided with a resilient force in the circumferential direction on a side surface of the fitting protrusion opposite to the locking hook. A biasing mechanism is provided to engage the locking hooks with each other in the joint body,
The artificial leg according to claim 1, wherein the joint bodies are detachably connected to each other by the elastic biasing force of the biasing mechanism. 4. The prosthetic foot portion includes a plurality of types of prosthetic foot portions having different shapes and a prosthetic foot portion having an elastically deformable member in a vertical direction with respect to a ground plane, and the prosthetic foot leg portion. The artificial leg according to any one of claims 1 to 3, wherein the artificial leg part is detachable and replaceable. 5. A receiving member, which is engaged with each other and receives a torsion moment about an axis of the joint, is provided at a connecting portion between the lower leg of the artificial leg and the joint. The artificial leg according to any one of claims 1 to 4. 6. The joint is provided with a connecting member that is connected to the artificial leg portion separately from the joint body in order to receive a torsion moment about the axis of the joint body. The artificial leg according to any one of claims 1 to 4. 7. A prosthesis provided with a detachable joint at the prosthetic ankle joint in order to connect the prosthetic leg and the prosthetic foot to the prosthetic foot joint, wherein the joint comprises a male joint and a female joint. A side joint, one of the male joint and the female joint has a proximal end connected to the prosthetic leg and the other proximal end connected to the artificial leg, the male joint and the female joint. The side joint has a fitting tubular portion that fits with each other,
A fitting groove is provided in the fitting tubular portion of the male side joint, and means for fitting the male side fitting and the female side fitting into the fitting tubular portion of the female side fitting is fitted in the fitting groove. The prosthesis characterized by that.