Knee prosthesis device

Abstract

This utility model discloses a knee joint prosthesis device, relating to the field of prosthetic technology. It aims to solve the technical problem of current linear cylinder-driven methods, which are not smooth enough in use and cause discomfort to users. The device includes a lower mounting mechanism and an upper mounting mechanism rotatably connected to each other, and a drive mechanism disposed on the lower mounting mechanism. The upper mounting mechanism includes a thigh connecting arm, and the lower mounting mechanism includes a foot connecting arm. The drive mechanism includes a cylinder embedded in the foot connecting arm and an electrically operated telescopic rod disposed in a mounting groove. A buffer energy storage plate is mounted on the cylinder. This utility model can simulate the natural movement trajectory of the human knee joint. Compared with the linear cylinder-driven method, it can achieve smoother and more natural rotation angle changes at the prosthetic knee joint, making the user's walking posture closer to that of a normal person, thus enhancing the user's mobility and quality of life.

Description

Technical Field

[0001] This utility model relates to the field of prosthetics technology, and more specifically, to a knee joint prosthetic device. Background Technology

[0002] Knee prostheses are designed specifically for patients who have lost their knee joints, helping them regain mobility. They utilize advanced materials, with the main body primarily made of lightweight yet strong titanium alloy, ensuring durability. The prosthesis is designed to closely fit the residual limb, and the soft, comfortable lining reduces skin abrasion. These features significantly improve patients' quality of life and restore their confidence.

[0003] In pneumatically driven knee prostheses, the knee joint flexion is achieved by adjusting the air pressure through a straight-rod cylinder. However, this straight-rod cylinder drive method suffers from a lack of smoothness, making it difficult to accurately simulate the natural movement trajectory of the human knee joint and causing discomfort to the user. Therefore, we propose a knee prosthesis device. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology, adapt to the needs of reality, and provide a knee joint prosthesis device to solve the technical problem that the current method of using a straight rod cylinder drive is not smooth enough in use and causes discomfort to the user.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a knee joint prosthesis device, including a lower mounting mechanism and an upper mounting mechanism rotatably connected to each other, and a drive mechanism disposed on the lower mounting mechanism. The upper mounting mechanism includes a thigh connecting arm, and the lower mounting mechanism includes a foot connecting arm. The upper end of the foot connecting arm is symmetrically provided with mounting plates, which are circular in shape. A mounting shaft is disposed between the mounting plates. A mounting groove is disposed at the lower part of the side end of the foot connecting arm. The drive mechanism includes a cylinder embedded in the foot connecting arm and an electric telescopic rod disposed in the mounting groove. A buffer energy storage plate is mounted on the cylinder.

[0006] Preferably, a positioning plate is provided at the lower end of the thigh connecting arm, the lower end surface of the positioning plate is an arc surface adapted to the mounting plate, the positioning plate is attached to the outer surface of the mounting plate, and a protrusion is provided at the front of the upper end of the mounting plate, the protrusion being limited at the front end of the positioning plate.

[0007] Preferably, a rotating bushing is installed at the lower end of the positioning plate. The rotating bushing is a circular tubular structure and is sleeved on the mounting shaft.

[0008] Preferably, the cylinder includes a first cylinder body and a second cylinder body, the second cylinder body and the first cylinder body are distributed at a 90-degree angle, the first cylinder body is arranged in an arc along the long axis, the center of the first cylinder body is consistent with the axis of the mounting shaft, a piston rod is provided in the first cylinder body, and the end of the piston rod is connected to the thigh connecting arm.

[0009] Preferably, a piston plate is provided inside the second cylinder, and the end of the telescopic rod of the electric telescopic rod is located inside the second cylinder, and the end of the telescopic rod is connected to the piston plate.

[0010] Preferably, the buffer energy storage plate is made of elastic metal and is generally arc-shaped. The arc of the buffer energy storage plate is consistent with the arc of the first cylinder. The buffer energy storage plate includes a curved part and vertical parts disposed at both ends of the curved part. The curved part is configured with several bends and the bending shape of the curved part is V-shaped. Cylinder sleeve holes and rod sleeve holes are respectively opened on the two vertical parts. The two vertical parts are respectively sleeved on the outside of the first cylinder and the piston rod.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model designs a cylinder structure in which the first cylinder body is arc-shaped along its long axis, with the center of the arc coinciding with the axis of the mounting shaft. When the electric telescopic rod pushes the piston plate to change the air pressure of the second cylinder body, the piston rod in the first cylinder body moves along the arc trajectory of the cylinder body, thereby driving the thigh connecting arm to rotate around the mounting shaft, simulating the natural movement trajectory of the human knee joint. Compared with the straight rod cylinder drive method, it can achieve a smoother and more natural rotation angle change at the knee joint of the prosthesis, making the walking posture of the prosthesis user closer to that of a normal person, improving the bionic performance of the prosthesis, and enhancing the user's mobility and quality of life. Secondly, the arc-shaped cylinder can position the knee joint bending, ensuring the stability of the bending, and solving the problem that the current straight rod cylinder drive method is not smooth enough in use and causes discomfort to the user.

[0013] 2. This utility model also incorporates a buffer energy storage plate structure. The buffer energy storage plate is made of elastic metal and is arc-shaped with the same curvature as the first cylinder. Its curved part consists of several V-shaped bends. During the bending process of the prosthetic knee joint, the buffer energy storage plate can effectively buffer the impact force generated when the user walks, reduce the impact of vibration on the user, and reduce discomfort. Secondly, while buffering the impact force, the buffer energy storage plate stores elastic potential energy. When the piston rod extends and releases energy, the elastic potential energy stored in the buffer energy storage plate can assist the piston rod in its movement, making the flexion and extension movements of the prosthesis smoother and more natural. It also reduces the burden on the drive mechanism to a certain extent, reduces energy consumption, and makes it easier for the user to walk.

[0014] 3. This utility model also designs an installation plate and a positioning plate structure. The lower end surface of the positioning plate at the lower end of the thigh connecting arm is an arc surface that matches the installation plate, and the protrusion on the installation plate limits the positioning plate. This structural design not only ensures the flexibility of rotation between the thigh connecting arm and the foot connecting arm, but also positions and limits the connection part to prevent the prosthetic knee joint from rotating forward, thereby enhancing the stability of the overall structure. Attached Figure Description

[0015] Figure 1 This is a front view structural diagram of the present utility model;

[0016] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the thigh connecting arm structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the lower leg connecting arm structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the arc-shaped cylinder structure of this utility model;

[0020] Figure 6 This is a schematic diagram of the buffer energy storage plate structure of this utility model.

[0021] The following are the labeling instructions in the diagram: 100, lower mounting mechanism; 101, foot connecting arm; 102, mounting plate; 1021, protrusion; 103, mounting shaft; 104, mounting groove; 200, upper mounting mechanism; 201, thigh connecting arm; 202, positioning plate; 203, rotating bushing; 300, drive mechanism; 301, cylinder; 3011, first cylinder body; 3012, second cylinder body; 3013, piston plate; 3014, piston rod; 302, electric telescopic rod; 303, buffer energy storage plate; 3031, bending part; 3032, vertical part; 3033, cylinder liner hole; 3034, rod sleeve hole. Detailed Implementation

[0022] like Figures 1 to 6As shown, the present invention relates to a knee joint prosthesis device, including a lower mounting mechanism 100 and an upper mounting mechanism 200 rotatably connected to each other, and a drive mechanism 300 disposed on the lower mounting mechanism 100. The upper mounting mechanism 200 includes a thigh connecting arm 201, and the lower mounting mechanism 100 includes a foot connecting arm 101. Mounting plates 102 are symmetrically arranged on the upper end of the foot connecting arm 101. The mounting plates 102 are circular. A mounting shaft 103 is disposed between the mounting plates 102. A mounting groove 104 is disposed at the lower part of the side end of the foot connecting arm 101. The drive mechanism 300 includes a cylinder 301 embedded in the foot connecting arm 101 and an electric telescopic rod 302 disposed in the mounting groove 104. A buffer energy storage plate 303 is mounted on the cylinder 301. This invention features a special drive structure that can simulate the natural movement trajectory of the human knee joint. Compared with the straight rod cylinder drive method, it can achieve smoother and more natural rotation angle changes at the prosthetic knee joint, making the walking posture of the prosthetic user closer to that of a normal person, improving the bionic performance of the prosthesis, and enhancing the user's mobility and quality of life.

[0023] Specifically, a positioning plate 202 is provided at the lower end of the thigh connecting arm 201. The lower end surface of the positioning plate 202 is an arc surface adapted to the mounting plate 102. The positioning plate 202 is attached to the outer surface of the mounting plate 102. A protrusion 1021 is provided at the front of the upper end of the mounting plate 102, and the protrusion 1021 limits the front end of the positioning plate 202. The lower end surface of the positioning plate 202 is adapted to the arc surface of the mounting plate 102, and the protrusion 1021 on the mounting plate 102 limits the positioning plate 202. This structural design not only ensures the flexibility of rotation between the thigh connecting arm 201 and the foot connecting arm 101, but also positions and limits the connection part to prevent the prosthetic knee joint from rotating forward, thus enhancing the stability of the overall structure.

[0024] Furthermore, a rotating bushing 203 is installed at the lower end of the positioning plate 202. The rotating bushing 203 is a circular tubular structure and is sleeved on the mounting shaft 103. The rotating bushing 203 and the mounting shaft 103 are provided for the rotatable connection between the thigh connecting arm 201 and the foot connecting arm 101.

[0025] It is worth noting that the cylinder 301 includes a first cylinder body 3011 and a second cylinder body 3012. The second cylinder body 3012 is distributed at a 90-degree angle to the first cylinder body 3011. The first cylinder body 3011 is arranged in an arc along its long axis. The center of the first cylinder body 3011 is consistent with the axis of the mounting shaft 103. A piston rod 3014 is provided inside the first cylinder body 3011. The end of the piston rod 3014 is connected to the thigh connecting arm 201. The first cylinder 3011 is set in an arc along its long axis and its center is consistent with the axis of the mounting shaft 103. When the electric telescopic rod 302 pushes the piston plate 3013 to change the air pressure of the second cylinder 3012, the piston rod 3014 in the first cylinder 3011 can move along the arc trajectory of the cylinder, thereby driving the thigh connecting arm 201 to rotate around the mounting shaft 103, simulating the natural movement trajectory of the human knee joint. Compared with the straight rod cylinder drive method, a smoother and more natural rotation angle change can be achieved at the prosthetic knee joint, making the walking posture of the prosthetic user closer to that of a normal person.

[0026] It is worth mentioning that a piston plate 3013 is installed inside the second cylinder 3012, and the end of the telescopic rod of the electric telescopic rod 302 is located inside the second cylinder 3012, and the end of the telescopic rod is connected to the piston plate 3013. When the electric telescopic rod 302 is working, its end pushes the piston plate 3013 inside the second cylinder 3012 to move, which can change the air pressure inside the second cylinder 3012. The change in air pressure in the second cylinder 3012 is transmitted to the first cylinder 3011, thereby realizing the bending adjustment of the prosthetic knee joint.

[0027] It is worth noting that the buffer energy storage plate 303 is made of elastic metal. The buffer energy storage plate 303 is arc-shaped, and the arc of the buffer energy storage plate 303 is consistent with the arc of the first cylinder 3011. The buffer energy storage plate 303 includes a bent part 3031 and vertical parts 3032 provided at both ends of the bent part 3031. The bent part 3031 is configured with several bends, and the bending shape of the bent part 3031 is V-shaped. The two vertical parts 3032 are respectively provided with cylinder sleeve holes 3033 and rod sleeve holes 3034. The two vertical parts 3032 are respectively sleeved on the outside of the first cylinder 3011 and the piston rod 3014. The buffer energy storage plate 303 is made of elastic metal and is arc-shaped with the same curvature as the first cylinder 3011. Its curved part 3031 is composed of several V-shaped bends. During the bending process of the prosthetic knee joint, the buffer energy storage plate 303 can effectively buffer the impact force generated when the user walks, reduce the impact of vibration on the user, and reduce discomfort. Secondly, while buffering the impact force, the buffer energy storage plate 303 stores elastic potential energy. When the piston rod 3014 extends and releases energy, the elastic potential energy stored in the buffer energy storage plate 303 can assist the piston rod 3014 in its movement, making the flexion and extension movements of the prosthesis smoother and more natural, and to a certain extent reducing the burden on the drive mechanism 300 and reducing energy consumption.

[0028] Working Principle: This embodiment provides a knee prosthesis device. During use, when the user wears and walks, the electric telescopic rod 302 is activated. The end of the telescopic rod pushes the piston plate 3013 inside the second cylinder 3012 to move, changing the air pressure inside the second cylinder 3012. This pressure change is transmitted to the first cylinder 3011. Because the first cylinder 3011 is arc-shaped along its long axis, and its center coincides with the axis of the mounting shaft 103, under the action of air pressure, the piston rod 3014 inside the first cylinder 3011 moves along the cylinder trajectory. The end of the piston rod 3014 is connected to the thigh connecting arm 201. The movement of the piston rod 3014 causes the thigh connecting arm 201 to rotate around the mounting shaft 103, simulating the natural movement trajectory of the human knee joint. This allows for smoother and more natural rotation angle changes at the prosthetic knee joint, making the user's walking posture closer to that of a normal person. The improved bionic performance of the prosthesis enhances the user's mobility and quality of life. Secondly, the arc-shaped cylinder 301 can position the knee joint flexion, ensuring the stability of the flexion. During the knee flexion process of the prosthesis, the buffer energy storage plate 303 installed on the cylinder 301 will undergo elastic deformation. The buffer energy storage plate 303 is made of elastic metal and is arc-shaped. Its curvature is consistent with that of the first cylinder 3011. The curved part 3031 of the buffer energy storage plate 303 is composed of several V-shaped bends. This special structure can effectively buffer the impact force generated when the user walks. At the same time, the buffer energy storage plate 303 stores elastic potential energy during the deformation process. When the piston rod 3014 extends and releases energy, the elastic potential energy stored in the buffer energy storage plate 303 can assist the piston rod 3014 to move, further optimizing the flexion and extension movements of the prosthesis, making them smoother and more natural.

[0029] The embodiments disclosed herein are preferred embodiments, but are not limited thereto. Those skilled in the art can readily grasp the spirit of this utility model based on the above embodiments and make different extensions and variations. However, as long as they do not depart from the spirit of this utility model, they are all within the protection scope of this utility model.

Claims

1. A knee joint prosthesis device, characterized in that, The device includes a lower mounting mechanism (100) and an upper mounting mechanism (200) that are rotatably connected to each other, and a drive mechanism (300) disposed on the lower mounting mechanism (100). The upper mounting mechanism (200) includes a thigh connecting arm (201), and the lower mounting mechanism (100) includes a foot connecting arm (101). The upper end of the foot connecting arm (101) is symmetrically provided with mounting plates (102). The mounting plates (102) are circular. A mounting shaft (103) is disposed between the mounting plates (102). A mounting groove (104) is provided at the lower part of the side end of the foot connecting arm (101). The drive mechanism (300) includes a cylinder (301) embedded in the foot connecting arm (101) and an electric telescopic rod (302) disposed in the mounting groove (104). A buffer energy storage plate (303) is mounted on the cylinder (301).

2. The knee joint prosthesis device according to claim 1, characterized in that, The lower end of the thigh connecting arm (201) is provided with a positioning plate (202). The lower end surface of the positioning plate (202) is an arc surface adapted to the mounting plate (102). The positioning plate (202) is attached to the outer surface of the mounting plate (102). The upper front part of the mounting plate (102) is provided with a protrusion (1021), which is limited to the front end of the positioning plate (202).

3. A knee joint prosthesis device according to claim 2, characterized in that, The lower end of the positioning plate (202) is equipped with a rotating bushing (203), which is a circular tubular structure and is sleeved on the mounting shaft (103).

4. A knee joint prosthesis device according to claim 3, characterized in that, The cylinder (301) includes a first cylinder body (3011) and a second cylinder body (3012). The second cylinder body (3012) and the first cylinder body (3011) are distributed at a 90-degree angle. The first cylinder body (3011) is arranged in an arc along its long axis. The center of the first cylinder body (3011) is consistent with the axis of the mounting shaft (103). A piston rod (3014) is provided inside the first cylinder body (3011). The end of the piston rod (3014) is connected to the thigh connecting arm (201).

5. A knee joint prosthesis device according to claim 4, characterized in that, A piston plate (3013) is provided inside the second cylinder (3012), and the end of the telescopic rod of the electric telescopic rod (302) is located inside the second cylinder (3012), and the end of the telescopic rod is connected to the piston plate (3013).

6. A knee joint prosthesis device according to claim 5, characterized in that, The buffer energy storage plate (303) is made of elastic metal. The buffer energy storage plate (303) is arc-shaped. The arc of the buffer energy storage plate (303) is consistent with the arc of the first cylinder (3011). The buffer energy storage plate (303) includes a bent part (3031) and vertical parts (3032) provided at both ends of the bent part (3031). The bent part (3031) is configured with several bends. The bending shape of the bent part (3031) is V-shaped. The two vertical parts (3032) are respectively provided with cylinder sleeve holes (3033) and rod sleeve holes (3034). The two vertical parts (3032) are respectively sleeved on the outside of the first cylinder (3011) and the piston rod (3014).

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