Bionic finger prosthesis

Abstract

The utility model relates to bionic finger artificial limb technical field discloses a bionic finger artificial limb, including the back of the hand shell cover, the top side fixed connection of back of the hand shell cover has the support component of providing support, the inner wall sliding connection of support component has the guide rail, the right end rotation connection of guide rail has the guide link, the inside fixed connection of guide link has the curved link through the shaft, the outside sliding connection of curved link has the curved rail, the left end sliding connection of guide rail has the lever through the shaft, the inside rotation connection of lever has the link rod. In the utility model, through the bending of healthy finger, based on the transmission mechanism of crank slider - lever linkage, realize the complex movement of artificial finger, highly simulate the action of real finger, provide simple and efficient finger artificial limb scheme.

Description

Technical Field

[0001] This utility model relates to the field of bionic finger prosthesis technology, and in particular to a bionic finger prosthesis. Background Technology

[0002] According to patient statistics, some groups have issues with missing finger roots, such as having the thumb but missing the other four fingers, or having other fingers but missing the thumb. Therefore, there is a need to design a bionic finger prosthesis that bends along with the joints of the healthy fingers, thereby flexing the corresponding prosthesis. The aim is to provide more natural and flexible gestures and grasping abilities, achieving compatibility and functionality with human tissues.

[0003] Simply wear the corresponding ring on the healthy finger to enable the corresponding finger prosthesis to bend. After becoming familiar with the operation of the finger joints, practice simple movements, such as bending and extending one or more fingers. Next, try grasping different objects, adjusting finger posture and force to achieve a stable grasp. Finally, apply it in daily life scenarios such as picking up objects, writing, and eating, continuously practicing to improve proficiency.

[0004] In existing technologies, some bionic finger prostheses convert circular motion into linear motion during force transmission, such as lead screw and nut mechanisms. Although this conversion is possible, lead screw transmission is inefficient, laborious to operate, complex in structure, and has high maintenance costs. Moreover, its operating speed is limited, making it difficult to adapt to high-speed operating scenarios. Therefore, to address these shortcomings, a bionic finger prosthesis is proposed to solve the above problems. Utility Model Content

[0005] To overcome the problems of low transmission efficiency, laborious operation, and complex structure in the use of existing bionic finger prostheses, a bionic finger prosthesis transmission mechanism based on crank-slider-lever linkage is provided. This mechanism converts the circular motion of the healthy finger joint bending into linear motion, thereby driving the bending of the prosthetic finger.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A bionic finger prosthesis includes a back-of-hand shell. A support assembly is fixedly connected to the top side of the back-of-hand shell to provide support. A guide rail is slidably connected to the inner wall of the support assembly. A guide rod is rotatably connected to the right end of the guide rail. A curved link is fixedly connected to the inside of the guide rod via a shaft. A finger ring is fixed below the curved link to facilitate the insertion of the proximal joint of the healthy finger. A curved guide rail is slidably connected to the outside of the curved link. A lever is slidably connected to the left end of the guide rail via a shaft. A connecting rod is rotatably connected to the inside of the lever. A cross link is rotatably connected to the bottom end of the lever via a shaft. A rotating plate is rotatably connected to the right end of the cross link via a shaft. A prosthesis root fulcrum is rotatably connected to the right end of the prosthesis root fulcrum via a shaft. A middle phalanx is rotatably connected to the right end of the prosthesis root fulcrum. A transmission plate is rotatably connected to the right end of the transmission plate. A distal phalanx is rotatably connected to the right end of the transmission plate.

[0008] As a further description of the above technical solution:

[0009] The support assembly includes a support plate, the bottom side of which is fixedly connected to the top side of the back of the hand shell, and a guide groove is fixedly connected to the front side of the support plate.

[0010] As a further description of the above technical solution:

[0011] The guide groove is slidably connected to the outside of the guide rail, and the left side of the curved guide rail is fixedly connected to the right side of the support plate.

[0012] As a further description of the above technical solution:

[0013] The rear side of the connecting rod is fixedly connected to the front side of the back of the hand shell, and the right end of the cross link is rotatably connected to the left end of the distal phalanx via a shaft.

[0014] As a further description of the above technical solution:

[0015] The left end of the rotating plate is rotatably connected to the inside of the right end of the back of the hand shell via a shaft, and a strip-shaped opening is provided inside the lever.

[0016] This utility model has the following beneficial effects:

[0017] In this invention, the mid-segment phalanx is driven to bend and extend, simulating the mid-segment joint movement of a real finger. At the same time, the fulcrum at the root of the prosthesis transmits the movement to the transmission plate, which then drives the distal phalanx to move, completing the distal movement of the prosthesis finger. The right end of the cross linkage is rotatably connected to the left end of the distal phalanx, realizing the complex movement of the prosthesis finger and highly simulating the movement of a real finger. This utilizes levers to transmit force, reducing wear in existing technologies and extending its service life. Attached Figure Description

[0018] Figure 1 This is a three-dimensional view of a bionic finger prosthesis proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of a curved guide rail for a bionic finger prosthesis proposed in this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of a guide rail for a bionic finger prosthesis proposed in this utility model;

[0021] Figure 4 This is a schematic diagram of the cross linkage structure of a bionic finger prosthesis proposed in this utility model.

[0022] Legend:

[0023] 1. Healthy metacarpophalangeal joints; 2. Healthy proximal phalangeal joints; 3. Back of hand shell; 4. Support plate; 5. Guide groove; 6. Guide rail; 7. Guide link; 8. Bending link; 9. Bending rail; 10. Lever; 11. Cross link; 12. Rotating plate; 13. Prosthesis root fulcrum; 14. Transmission plate; 15. Middle phalanx; 16. Distal phalanx. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Reference Figures 1 to 3 This utility model provides an embodiment of a bionic finger prosthesis, including a back-of-hand shell 3. The back-of-hand shell 3 can be made of alloy or plastic materials and has good structural stability. A support assembly is fixedly connected to the top side of the back-of-hand shell 3, providing support. The support assembly includes a support plate 4, the bottom side of which is fixedly connected to the top side of the back-of-hand shell 3. This support plate 4 can be fixed by welding, riveting, or screws to provide stable support for the support plate 4. A guide groove 5 is fixedly connected to the front side of the support plate 4, and is fixed by welding to provide stable support for the guide groove 5. A guide rail 6 is slidably connected to the inner wall of the support assembly, and the guide rail 6 is adapted to the guide groove 5.

[0026] The guide groove 5 is slidably connected to the outside of the guide rail 6, and the sliding fit between the two is tight and smooth, allowing the guide rail 6 to slide stably along the guide groove 5. A guide connecting rod 7 is rotatably connected to the right end of the guide rail 6, allowing the guide rail 6 to rotate and change its angle under the drive of the guide connecting rod 7. A bending connecting rod 8 is fixedly connected inside the guide connecting rod 7 via a shaft, transmitting rotational force to the guide connecting rod 7. A bending guide rail 9 is slidably connected to the outside of the bending connecting rod 8, sliding through a pre-set slide rail. Its smooth surface effectively reduces friction, providing stable guidance for the bending movement of the bending connecting rod 8 and ensuring smooth bending action. The left side of the bending guide rail 9 is fixedly connected to the right side of the support plate 4, and can be fixed using an integrated molding process, thus providing stable support for the bending guide rail 9.

[0027] Reference Figures 2 to 4 A lever 10 is slidably connected to the left end of the guide rail 6 via an shaft. The lever 10 is slidably connected to the guide rail 6 via the shaft, allowing the guide rail 6 to transmit rotational force to the lever 10 via the shaft. A connecting rod is rotatably connected inside the lever 10, which restricts the lever 10 and allows it to rotate around the connecting rod. The rear side of the connecting rod is fixedly connected to the front side of the back of the hand shell 3 with screws, thus providing stable support for the connecting rod. A strip-shaped opening is provided inside the lever 10, which is adapted to the shaft at the top of the lever 10, thereby transmitting the rotational force of the guide rail 6 to the lever 10. A cross link 11 is rotatably connected to the bottom end of the lever 10 via an shaft, transmitting rotational force to the cross link 11 via the lever 10. A rotating plate 12 is rotatably connected to the right end of the cross link 11 via an shaft. The rotating plate 12 is rotatably connected to the cross link 11 via an shaft, providing a flexible connection. With the rotation of the cross link 11, the rotating plate 12 can rotate around the shaft to adjust its angle.

[0028] The right end of the back-of-hand shell 3 is rotatably connected to the prosthesis root fulcrum 13 via an axle. The left end of the rotating plate 12 is rotatably connected to the inside of the right end of the back-of-hand shell 3 via an axle, allowing the rotating plate 12 to rotate stably with the support of the back-of-hand shell 3. The right end of the prosthesis root fulcrum 13 is rotatably connected to the middle phalanx 15, which is rotatably connected to the prosthesis root fulcrum 13 via an axle. Driven by the prosthesis root fulcrum 13, the middle phalanx 15 can perform flexion and extension movements, simulating the movement of the middle joint of a real finger. The right end of the prosthesis root fulcrum 13 is rotatably connected to the transmission plate 14, which is rotatably connected to the prosthesis root fulcrum 13 via an axle. During the movement of the prosthesis, the transmission plate 14 transmits the movement of the prosthesis root fulcrum 13, realizing the transmission of force and motion. The right end of the transmission plate 14 is rotatably connected to the distal phalanx 16. The distal phalanx 16 is rotatably connected to the transmission plate 14 via a shaft. Driven by the transmission plate 14, the distal phalanx 16 can perform corresponding movements to complete the distal movements of the prosthetic finger, enhancing the biomimetic effect of the prosthesis. The right end of the cross link 11 is rotatably connected to the left end of the distal phalanx 16 via a shaft, allowing the cross link 11 to transmit its own movement to the distal phalanx 16, coordinating with other components to achieve complex movements of the prosthetic finger and better simulate the movements of a real finger.

[0029] Working principle: When the prosthesis needs to perform an action, the proximal joint 2 of the healthy finger is first inserted into the ring on the bending link 8. When the proximal joint 2 of the healthy finger bends, it drives the bending link 8 to rotate, which in turn drives the guide link 7 to rotate. The guide link 7 then drives the guide rail 6 to rotate. Guided by the guide groove 5, the guide rail 6 drives the lever 10 to rotate around the connecting rod as the center. Subsequently, the lever 10 drives the cross link 11 to rotate, which in turn drives the rotating plate 12 to rotate around the axis to adjust the angle. The rotation of the rotating plate 12 then drives the prosthesis root fulcrum 13 to rotate. With the rotation of the prosthesis root fulcrum 13, the middle phalanx 15 is driven to bend and extend, simulating the middle joint movement of a real finger. At the same time, the prosthesis root fulcrum 13 also transmits the motion to the transmission plate 14, which then drives the distal phalanx 16 to move, completing the distal movement of the prosthesis finger. The right end of the cross link 11 is rotatably connected to the left end of the distal phalanx 16, enabling complex movements of the prosthetic finger and highly simulating the movements of a real finger.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bionic finger prosthesis, characterized in that: The device includes a back-of-the-hand shell (3), on the top side of which a support assembly is fixedly connected. A guide rail (6) is slidably connected to the inner wall of the support assembly. A guide rod (7) is rotatably connected to the right end of the guide rail (6). A curved link (8) is fixedly connected to the inside of the guide rod (7) via a shaft. A finger ring is fixed below the curved link (8) to facilitate the insertion of the proximal joint (2) of a healthy finger. A curved guide rail (9) is slidably connected to the outside of the curved link (8). A lever (10) is slidably connected to the left end of the guide rail (6) via a shaft. The lever (10) is internally connected to a connecting rod, and the bottom end of the lever (10) is rotatably connected to a cross link (11) via a shaft. The right end of the cross link (11) is rotatably connected to a rotating plate (12) via a shaft. The right end of the back of the hand shell (3) is rotatably connected to a prosthesis root fulcrum (13) via a shaft. The right end of the prosthesis root fulcrum (13) is rotatably connected to a middle phalanx (15). The right end of the prosthesis root fulcrum (13) is rotatably connected to a transmission plate (14). The right end of the transmission plate (14) is rotatably connected to a distal phalanx (16).

2. The bionic finger prosthesis according to claim 1, characterized in that: The support assembly includes a support plate (4), the bottom side of which is fixedly connected to the top side of the back of the hand shell (3), and a guide groove (5) is fixedly connected to the front side of the support plate (4).

3. The bionic finger prosthesis according to claim 2, characterized in that: The guide groove (5) is slidably connected to the outside of the guide rail (6), and the left side of the curved rail (9) is fixedly connected to the right side of the support plate (4).

4. The bionic finger prosthesis according to claim 2, characterized in that: The rear side of the connecting rod is fixedly connected to the front side of the back of the hand shell (3), and the right end of the cross link (11) is rotatably connected to the left end of the distal phalanx (16) via a shaft.

5. A bionic finger prosthesis according to claim 2, characterized in that: The left end of the rotating plate (12) is rotatably connected to the right end of the back of the hand shell (3) via a shaft, and the inside of the lever (10) has a strip-shaped opening.

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