Artificial limb knee joint connecting structure and knee joint

Abstract

The utility model relates to the technical field of bionic devices. The utility model discloses an artificial limb knee joint connecting structure, an artificial limb knee joint comprises a linkage rod, a cylinder body and a piston, the piston is arranged in the cylinder body, and the connecting structure comprises a first connecting part, a second connecting part, a third connecting part and a main plate; the two main plates are arranged in a spaced mode, each main plate comprises a first end, a second end and a third end, the first connecting part is arranged at the first ends of the two main plates, the first connecting part is hinged to the linkage rod, the second connecting part is arranged at the second ends of the two main plates, the second connecting part is hinged to the cylinder body, and the third connecting part is arranged at the third ends of the two main plates. The third connecting part is hinged to the piston. According to the artificial limb knee joint connecting structure, the first connecting part, the second connecting part and the third connecting part are connected through the two light-weight main plates, the weight of the artificial limb knee joint connecting structure is reduced on the premise that the strength is optimized, more labor is saved when a user uses the artificial limb knee joint connecting structure, and parts are more durable.

Description

Technical Field

[0001] The utility model relates to the technical field of bionic devices, in particular to a prosthetic knee joint connection structure and a knee joint. Background Art

[0002] With the continuous advancement of modern science and technology, prosthetics have made remarkable achievements in compensating for human missing functions, especially in the design of prosthetics for patients with lower limb loss. The knee joint is considered to be the most critical functional component. The knee joint needs to be flexible and needs to withstand constant changes in load. The relative friction between parts causes wear and tear on the joint parts.

[0003] The connection structure in the existing prosthetic knee joint has the problem of being too heavy or insufficiently strong, which makes the disabled people with lower limb loss feel laborious to use or the parts are not durable. Utility Model Content

[0004] In view of this, the utility model provides a prosthetic knee joint connection structure and a knee joint.

[0005] Specifically, the following technical solutions are included:

[0006] In a first aspect, a prosthetic knee joint connection structure is provided, wherein the prosthetic knee joint comprises a linkage rod, a cylinder body and a piston, wherein the piston is disposed in the cylinder body, and the connection structure comprises:

[0007] A first connection part, a second connection part, a third connection part and a main board;

[0008] Two main boards are provided, and the two main boards are spaced apart. The main boards include a first end, a second end and a third end. The first connecting portion is provided at the first ends of the two main boards, and the first connecting portion is hinged to the connecting rod. The second connecting portion is provided at the second ends of the two main boards, and the second connecting portion is hinged to the cylinder body. The third connecting portion is provided at the third ends of the two main boards, and the third connecting portion is hinged to the piston.

[0009] Preferably, the main board is Y-shaped, and the body of the main board is a streamlined structure.

[0010] Preferably, the first connecting portion is a cylindrical tube structure.

[0011] Preferably, the second connecting portion is a cylindrical tube structure.

[0012] Preferably, the third connecting portion includes two circular ring structures, one of the circular ring structures is arranged at the third end of one of the main boards, and the two circular ring structures are coaxially arranged opposite to each other.

[0013] Preferably, the first end of the main board is connected to the outer wall of the first connecting portion in a smooth transition;

[0014] The second end of the main board is smoothly transitionally connected to the outer wall of the second connecting portion;

[0015] The third end of the main board is connected to the outer wall of the third connecting portion in a smooth transition.

[0016] Preferably, the connection structure further includes a sub-plate, a first end of the sub-plate is connected to the first connection portion, and a second end of the sub-plate is connected to the second connection portion.

[0017] Preferably, the plane where the axis of the first connecting part and the axis of the second connecting part are located is a reference plane;

[0018] The main board is arranged on one side of the reference surface, and the sub-board is arranged on the other side of the reference surface.

[0019] Preferably, the projection of the secondary board on the reference surface is located between two projections of the two main boards on the reference surface.

[0020] In a second aspect, a knee joint is provided, on which is provided a prosthetic knee joint connection structure as described in the first aspect.

[0021] The beneficial effects of the technical solution provided by the utility model include at least:

[0022] The present application uses two lightweight main boards to connect the first connection part, the second connection part and the third connection part. The shape and setting position of the main boards are obtained through numerical simulation. The weight of the prosthetic knee joint connection structure is reduced while the strength is optimized, which makes it easier for users to use and the parts more durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic diagram of the existing structure of the prosthetic knee joint connection structure;

[0025] Figure 2 A schematic diagram of the installation structure of the existing structure of the prosthetic knee joint connection structure in the knee joint;

[0026] Figure 3 A schematic diagram of the installation structure of a prosthetic knee joint connection structure in a knee joint according to an embodiment of the utility model;

[0027] Figure 4 A cross-sectional view of the installation structure of a prosthetic knee joint connection structure in a knee joint according to an embodiment of the utility model;

[0028] Figure 5 A schematic diagram of a prosthetic knee joint connection structure according to an embodiment of the utility model;

[0029] Figure 6 It is a front view of a prosthetic knee joint connection structure according to an embodiment of the utility model;

[0030] Figure 7 It is a right side view of a prosthetic knee joint connection structure according to an embodiment of the utility model;

[0031] Figure 8 This is a top view of a prosthetic knee joint connection structure according to an embodiment of the utility model.

[0032] The reference numerals in the figures represent respectively:

[0033] 1′-existing connection structure; 1-connection structure; 11-first connection part; 12-second connection part; 13-third connection part; 14-main board; 15-sub-board; 2-base; 3-connecting rod; 4-cylinder body; 41-support; 5-piston; 6-connecting rod.

[0034] The above drawings have shown a clear embodiment of the utility model, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the utility model in any way, but to illustrate the concept of the utility model for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In order to make the technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] Existing prosthetic knee joint connection structure 1′ is as follows Figure 1 As shown. Figure 2As shown, during use, the base 2 is connected to the residual limb of the patient, the connecting rod 3 is provided with a connecting ball, the base 2 is provided with a ball socket, the connecting ball is arranged in the ball socket, and the connecting rod 3 and the base 2 are hinged through the connecting ball and the ball socket (refer to Figure 4 ). The piston 5 is arranged in the cylinder body 4, and the support 41 is arranged at one end of the cylinder body 4, and the cylinder body 4 is hinged to the existing connection structure 1′ through the support 41. The support 41 includes a first end and a second end, and the first end and the second end are arranged opposite to each other. The existing connection structure 1′ is connected to the first end of the support 41, and the second end of the support 41 is connected to the connecting rod 3 through the connecting rod 6. The connecting rod 6 can rotate relative to the support 41 and can also rotate relative to the connecting rod 3. Now the connection structure 1′ is a regular structure. The existing connection structure 1′ is provided with a first circular hole, a second circular hole and two third circular holes arranged oppositely. The existing connection structure 1′ is hinged to the connecting rod 3 through the first circular hole, hinged to the support 41 through the second circular hole, and hinged to the piston 5 rod through the two third circular holes arranged oppositely. The existing connection structure 1′ has the problem of being too heavy or insufficient in strength, which causes the disabled people with lower limb loss to have a laborious use process or the problem of the structure being not durable.

[0038] The present application provides a prosthetic knee joint connection structure 1 including: a first connection part 11, a second connection part 12, a third connection part 13 and a main board 14. Two main boards 14 are provided, and the two main boards 14 are arranged at intervals. The main boards 14 include a first end, a second end and a third end. The first connection part 11 is provided at the first end of the two main boards 14, and the first connection part 11 is hinged to the connecting rod 3. The second connection part 12 is provided at the second end of the two main boards 14, and the second connection part 12 is hinged to the cylinder body 4. The third connection part 13 is provided at the third end of the two main boards 14, and the third connection part 13 is hinged to the piston 5. The present application uses two lightweight main boards 14 to connect the first connection part 11, the second connection part 12 and the third connection part 13. The shape and setting position of the main board 14 are obtained through numerical simulation. The weight of the prosthetic knee joint connection structure 1 is reduced under the premise of optimizing the strength, which makes it easier for users to use and the parts are more durable.

[0039] Specifically, Figures 3 to 8 As shown, the main board 14 is Y-shaped, and the main board 14 has a streamlined structure. The main board 14 includes a long end and two short ends, the first connecting portion 11 is connected to the long end, and the two short ends are connected to the second connecting portion 12 and the third connecting portion 13 respectively.

[0040] Specifically, Figure 4 and Figure 5As shown, the first connecting part 11 is a cylindrical tube structure. The first connecting part 11 and the connecting rod 3 are hinged by a connecting shaft. The connecting shaft runs through the second connecting part 12, which is a cylindrical tube structure. The second connecting part 12 and the support 41 on the cylinder body 4 are hinged by a connecting shaft. The third connecting part 13 includes two circular ring structures, one circular ring structure is arranged at the third end of a main board 14, and the two circular ring structures are coaxially arranged opposite to each other. One end of the piston 5 is arranged between the two circular ring structures, and the piston 5 and the two circular ring structures are hinged by a connecting shaft, and there is surface contact between the piston 5 and the two circular ring structures. The third end of the main board 14 and the outer wall of the third connecting part 13 are smoothly transitionally connected.

[0041] Specifically, Figure 5 and Figure 6 As shown, the first end of the main board 14 is connected to the outer wall of the first connecting portion 11 in a smooth transition. The second end of the main board 14 is connected to the outer wall of the second connecting portion 12 in a smooth transition.

[0042] Specifically, Figure 6 As shown, the first end of the main board 14 is the upper end of the main board 14 , the second end of the main board 14 is the lower left end of the main board 14 , and the third end of the main board 14 is the lower right end of the main board 14 .

[0043] Specifically, Figure 5 and Figure 6 As shown, the end surface of the first end of the main board 14 is an arc structure, and is consistent with the shape of the outer wall surface of the first connecting portion 11. The end surface of the second end of the main board 14 is an arc structure, and is consistent with the shape of the outer wall surface of the second connecting portion 12. Both end surfaces of the third end of the main board 14 are arc structures, and are consistent with the shape of the outer wall surface of the third connecting portion 13.

[0044] Specifically, Figures 5 to 7 As shown, the connection structure 1 further includes a sub-plate 15 , a first end of the sub-plate 15 is connected to the first connection portion 11 , and a second end of the sub-plate 15 is connected to the second connection portion 12 .

[0045] Specifically, Figure 6 As shown, the first end of the sub-plate 15 is the upper end of the sub-plate 15, and the second end of the sub-plate 15 is the lower end of the sub-plate 15. The end surface of the first end of the sub-plate 15 is an arc structure, and is consistent with the shape of the outer wall surface of the first connecting portion 11, and the first end of the sub-plate 15 is smoothly connected to the outer wall of the first connecting portion 11. The end surface of the second end of the sub-plate 15 is an arc structure, and is consistent with the shape of the outer wall surface of the second connecting portion 12, and the second end of the sub-plate 15 is smoothly connected to the outer wall of the second connecting portion 12.

[0046] Specifically, Figure 6 As shown, the plane where the axis of the first connecting portion 11 and the axis of the second connecting portion 12 are located is the reference plane (reference Figure 6The main board 14 is arranged on one side of the reference surface, and the sub-board 15 is arranged on the other side of the reference surface.

[0047] Specifically, Figure 6 As shown, the main board 14 is arranged on the right side of the reference surface, and the sub-board 15 is arranged on the left side of the reference surface. The first end of the sub-board 15 and the first end of the main board 14 are both arranged close to the reference surface. The connection position between the first end of the sub-board 15 and the first connection part 11 and the connection position between the first end of the main board 14 and the first connection part 11 are located on the same semicircular surface of the first connection part 11. The connection position between the second end of the sub-board 15 and the second connection part 12 and the connection position between the second end of the main board 14 and the second connection part 12 are located on the same semicircular surface of the second connection part 12. Figure 6 As shown, the connection position between the first end of the sub-board 15 and the first connection part 11 and the connection position between the first end of the main board 14 and the first connection part 11 are located on the lower semi-cylindrical surface of the first connection part 11. The connection position between the second end of the sub-board 15 and the second connection part 12 and the connection position between the second end of the main board 14 and the second connection part 12 are located on the upper semi-cylindrical surface of the second connection part 12.

[0048] Specifically, Figure 7 As shown, the projection of the secondary board 15 on the reference surface is located between the two projections of the two main boards 14 on the reference surface.

[0049] Specifically, Figure 7 As shown, the projection width of the two main boards 14 on the reference surface is smaller than the projection width of the first connection part 11 on the reference surface, and is also smaller than the projection width of the second connection part 12 on the reference surface, so as to prevent the two main boards 14 from interfering with other parts of the knee joint.

[0050] Specifically, the projection width of the first connection portion 11 on the reference surface is equal to the projection width of the second connection portion 12 on the reference surface.

[0051] Specifically, Figure 1 The connection structure 1 shown is angular, simple, and relatively regular, and has problems of stress concentration and material redundancy. The present application optimizes and reconstructs the original structure without changing the material, and can achieve the requirements of weight reduction and safety.

[0052] This application is for Figure 5The load change of the connection structure 1 shown in the figure during movement is simulated. Simulation steps: first determine the immovable parts, that is, the base 2; then connect the various parts, including bolt connection, hinge, etc.; then set the gravity direction and set the material; finally connect the drive motor to the piston 5 to apply the driving force to move the connection structure 1. After the conditions are set, perform a dynamic finite element analysis on the knee joint connection structure. After the analysis is completed, the changes in the deformation, stress and minimum safety factor of the prosthetic knee joint connection structure 1 during movement can be obtained. During the simulation analysis, the setting of the initial conditions is very important, and it is necessary to fully simulate the various load conditions of the connection structure 1 during movement.

[0053] While meeting technical requirements, the volume of the connecting structure should be reduced as much as possible. The smaller the volume, the lighter the weight, and the less burden on the user; less material will be used, reducing production costs.

[0054] The simulation results show that the maximum deformation of the existing connection structure 1' is 0.04354mm, the maximum Mises equivalent stress is 95.41MPa, the minimum safety factor is 2.5, and the weight is 55.52g. The maximum deformation of the optimized connection structure 1 is 0.006782mm, the maximum Mises equivalent stress is 72.22MPa, the minimum safety factor is 3.3, and the weight is 17.58g. It can be seen that after the lightweight design, the connection structure 1 of the present application has reduced its weight by 68.34%, greatly reduced the overall consumables, reduced the deformation, and increased the minimum safety factor. Therefore, the connection structure 1 of the present application has a reasonable structure and a smooth and beautiful appearance.

[0055] The connection structure of the present application is obtained by continuous optimization based on simulation results.

[0056] The present application also provides a knee joint, on which the prosthetic knee joint connection structure 1 as described above is provided.

[0057] like Figure 3 and Figure 4As shown, the base 2 is connected to the residual limb of the patient, a connecting ball is provided on the connecting rod 3, a ball socket is provided on the base 2, the connecting ball is arranged in the ball socket, and the connecting rod 3 and the base 2 are hinged through the connecting ball and the ball socket. The piston 5 is arranged in the cylinder 4, and the support 41 is arranged at one end of the cylinder 4. The cylinder 4 is hinged to the second connecting part 12 of the connecting structure 1 through the support 41. The support 41 includes a first end and a second end, and the first end and the second end are arranged oppositely. The second connecting part 12 of the connecting structure 1 is connected to the first end of the support 41, and the second end of the support 41 is connected to the connecting rod 3 through the connecting rod 6. The connecting rod 6 can rotate relative to the support 41 and can also rotate relative to the connecting rod 3. The first connecting part 11 of the connecting structure 1 is hinged to the connecting rod 3, and the third connecting part 13 of the connecting structure 1 is hinged to the piston 5. The connecting structure 1 is light in weight and strong in strength, labor-saving in use, and durable in structure.

[0058] In the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0059] Those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the present invention disclosed herein. The present invention is intended to cover any variation, use, or adaptation of the present invention that follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and examples are to be regarded as exemplary only.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A prosthetic knee joint connection structure, the prosthetic knee joint comprising a linkage rod, a cylinder and a piston, the piston being arranged in the cylinder, characterized in that: The connection structure comprises: A first connection part, a second connection part, a third connection part and a main board; Two main boards are provided, and the two main boards are spaced apart. The main boards include a first end, a second end and a third end. The first connecting portion is provided at the first ends of the two main boards, and the first connecting portion is hinged to the connecting rod. The second connecting portion is provided at the second ends of the two main boards, and the second connecting portion is hinged to the cylinder body. The third connecting portion is provided at the third ends of the two main boards, and the third connecting portion is hinged to the piston.

2. A prosthetic knee joint connection structure according to claim 1, characterized in that: The main board is Y-shaped, and the body of the main board is a streamlined structure.

3. The prosthetic knee joint connection structure according to claim 1, characterized in that: The first connecting portion is a cylindrical tube structure.

4. The prosthetic knee joint connection structure according to claim 1, characterized in that: The second connecting portion is a cylindrical tube structure.

5. The prosthetic knee joint connection structure according to claim 1, characterized in that: The third connecting portion includes two circular ring structures, one of the circular ring structures is arranged at the third end of one of the main boards, and the two circular ring structures are coaxially arranged opposite to each other.

6. The prosthetic knee joint connection structure according to claim 1, characterized in that: The first end of the main board is smoothly transitionally connected to the outer wall of the first connecting portion; The second end of the main board is smoothly transitionally connected to the outer wall of the second connecting portion; The third end of the main board is connected to the outer wall of the third connecting portion in a smooth transition.

7. The prosthetic knee joint connection structure according to claim 1, characterized in that: The connection structure further includes a sub-plate, a first end of the sub-plate is connected to the first connection portion, and a second end of the sub-plate is connected to the second connection portion.

8. The prosthetic knee joint connection structure according to claim 7, characterized in that: The plane where the axis of the first connecting part and the axis of the second connecting part are located is a reference plane; The main board is arranged on one side of the reference surface, and the sub-board is arranged on the other side of the reference surface.

9. The prosthetic knee joint connection structure according to claim 8, characterized in that: The projection of the secondary board on the reference surface is located between two projections of the two main boards on the reference surface.

10. A knee joint, characterized in that: A prosthetic knee joint connection structure as claimed in any one of claims 1 to 9 is arranged thereon.

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