Knee joint stability training device

Abstract

The knee joint stability training device comprises a base, a support, an electric cylinder, a belt, a first pressure sensor, a control unit and a display unit. The base is arranged on the ground; the bracket is arranged at the front part of the base; the electric cylinder is mounted at the upper part of the bracket; the output end of the electric cylinder extends forwards; the two ends of the belt are combined to the output ends of the electric cylinders, a first pressure sensor is installed in the middle of the belt, and the first pressure sensor is located on the bent portion of the U shape and used for supporting the rear side of the knee joint of the subject to be trained; the electric cylinder comprises an electric cylinder driving unit, and the electric cylinder driving unit is controlled by the control unit to drive the electric cylinder to work; the first pressure sensor feeds back a pressure value measured by the first pressure sensor as a first pressure value to the control unit, and the control unit outputs a control instruction to the electric cylinder driving unit according to the first pressure value so as to adjust the output force of the electric cylinder; the display unit is connected with the control unit, and the first pressure value is displayed on the display unit.

Description

TECHNICAL FIELD

[0001] The present application relates to a medical device, in particular to a knee stability training device. BACKGROUND

[0002] In the knee stability training, one training method is that (taking the right knee as an example) the subject is in a standing position, the soles press the ground with force, the body is straight, the operator places both hands under the popliteal fossa of the right knee of the patient, and applies a backward-to-forward pulling force. The subject does uniform flexion and extension movement of the right knee under the continuous action of the pulling force, 3 times per group, and 3 groups in total. During the training, the feet cannot move or slide.

[0003] The mechanism of the knee stability training of this method is that the operator places both hands under the popliteal fossa of the right knee of the patient, and applies a backward-to-forward force, so as to make the right knee capsule tense, increase the stimulation of the proprioceptors of the knee, and do flexion and extension movement of the knee in this state, so as to activate the central nervous system through effective external stimulation, and strengthen the stability of the knee.

[0004] When the knee stability training of this form is performed, it is expected that the force output by the knee against the backward-to-forward pulling force is constant. Without the help of special equipment, the force output by the knee can only be based on the subjective feeling of the operator or the subject, but the subjective feeling is affected by factors such as physical fatigue and mood, and is not objective. SUMMARY

[0005] In view of the above problems, the present application aims to provide a knee stability training device which can help the subject to perform knee stability training, and can directly feedback the force output by the knee of the subject in the forward-to-backward direction, so as to facilitate the subject to keep the force output in the forward-to-backward direction stable during the training. The present application also aims to provide a knee stability training device which can feedback the downward pressing force of the subject in time, so as to facilitate the subject to make timely adjustment, so that the force output by the knee in the upward-to-downward direction during the training can also be kept stable.

[0006] The knee stability training device of the present application comprises a base, a support, an electric cylinder, a belt, a first pressure sensor, a control unit and a display unit. The base is arranged on the ground; the support is arranged at the front of the base; the electric cylinder is installed at the upper part of the support; the output end of the electric cylinder extends forward; the two ends of the belt are respectively provided with through circular holes, the two ends of the belt are folded into a U shape after being aligned, the two ends of the belt are rotatably combined on the output end of the electric cylinder through the circular holes, the middle part of the belt is located above the rear part of the base, and the first pressure sensor is installed at the middle part of the belt; the first pressure sensor is located at the bending part of the U shape and is used for supporting the rear side of the knee joint of the subject during training to measure the force output by the subject against the pulling force of the belt during uniform flexion and extension of the knee joint; The electric cylinder comprises an electric cylinder driving unit, which is controlled by the control unit to drive the electric cylinder to work; the first pressure sensor feeds back the pressure value measured by it as a first pressure value to the control unit, and the control unit compares the first pressure value with a preset pressure value, thereby outputting a control instruction to the electric cylinder driving unit to adjust the output force of the electric cylinder; The display unit is connected with the control unit and displays the first pressure value thereon.

[0007] Preferably, a second pressure sensor is further included; The second pressure sensor is arranged on the upper surface of the rear part of the base and is used for supporting the lower side of the corresponding foot bottom of the knee joint to measure the force output by the subject in the up-down direction during uniform flexion and extension of the knee joint as a second pressure value; the second pressure value is also displayed on the display unit.

[0008] Preferably, the display unit is arranged at the upper end of the support.

[0009] Preferably, the base is formed in a H shape; the front part of the base is formed with a slot; a through threaded hole is formed in the side wall of the slot; a bolt is installed in the threaded hole; the lower part of the support is inserted into the slot and fastened at a desired height position in the slot by the bolt.

[0010] Preferably, the rear part of the support is formed with a recess, and the second pressure sensor is arranged in the recess.

[0011] Preferably, a mounting block is fixedly installed on the output end of the electric cylinder; cylindrical mounting rods are respectively formed on the left and right sides of the mounting block and extend outward; the circular holes at the two ends of the belt are correspondingly installed on the two mounting rods.

[0012] Preferably, the support is formed in an L shape.

[0013] The knee stability training device of this application uses an electric cylinder to drive a belt, applying a forward-backward pulling force to the subject's knee joint. A first pressure sensor located in the middle of the belt measures the force output by the subject's knee joint against the pulling force and provides visual feedback to the subject, facilitating adjustments to the knee joint's output. Since the subject is performing uniform knee flexion and extension movements, the force sensed by the first pressure sensor is also the output force of the electric cylinder, which can be used as feedback to adjust the cylinder's output via a control unit, ensuring a constant external stimulus force on the subject's knee. The knee stability training device of this application also includes a pressure sensor at the point where the subject steps, further sensing the subject's vertical output force during training and providing visual feedback to the subject, facilitating knee joint adjustments. This ensures a constant output force not only in the forward-backward direction but also in the vertical direction, promoting the objective and smooth progress of knee joint stability training. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the knee joint stability training device of the present invention.

[0015] Figure 2 for Figure 1 A top view of the knee joint stability training device.

[0016] Figure 3 for Figure 1 A three-dimensional structural diagram of the base of the knee joint stability training device.

[0017] Figure 4 for Figure 1 A three-dimensional structural diagram of the knee stability training device after removing the base and belt.

[0018] Figure 5 for Figure 1 A three-dimensional structural diagram of the belt of the knee joint stability training device.

[0019] Figure 6 for Figure 1 The schematic diagram of the circuit part of the knee joint stability training device. Detailed Implementation

[0020] The knee joint stability training device of this application will now be described in detail with reference to the accompanying drawings.

[0021] The knee joint stability training device of this application includes: a base 10, a bracket 20, an electric cylinder 30, a belt 40, a first pressure sensor 41, a second pressure sensor 13, a control unit 60, and a display unit 50.

[0022] The base 10 is for mounting on the ground. The bracket 20 is located at the front of the base 10. The electric cylinder 30 is mounted on the upper part of the bracket 20. The output end of the electric cylinder 30 extends forward. The belt 40 has through-holes at both ends; after the two ends of the belt 40 are aligned, it is bent into a U-shape, as shown below. Figure 5 As shown. The two ends of the belt 40 are rotatably connected to the output end of the electric cylinder 30 through its circular holes. The middle part of the belt 40 is located above the rear of the base 10. A first pressure sensor 41 is installed in the middle of the belt 40. The first pressure sensor 41 is located in the U-shaped bend and is used to support the back of the knee joint of the subject during training to measure the force output by the subject against the tension of the belt during the uniform flexion and extension of the knee joint.

[0023] The electric cylinder 30 includes an electric cylinder drive unit 61, which is controlled by the control unit 60 to drive the electric cylinder 30 to operate. A first pressure sensor 41 feeds back its measured pressure value as a first pressure value to the control unit 60. The control unit 60 compares the first pressure value with a preset pressure value, thereby outputting a control command to the electric cylinder drive unit 61 to adjust the output force of the electric cylinder 30. During the uniform flexion and extension of the knee joint, the output end of the electric cylinder 30 extends and retracts accordingly to ensure that the tension on the knee joint remains at a predetermined value.

[0024] The display unit 50 is connected to the control unit 60 and displays the first pressure value on it.

[0025] The second pressure sensor 13 is located on the upper surface of the rear of the base 10 and is used to support the foot under the knee to measure the force output by the subject in the vertical direction during the uniform flexion and extension of the knee joint as a second pressure value; the second pressure value is also displayed on the display unit 50.

[0026] The display unit 50 is located at the top of the support, making it convenient for the subject to observe the first and second pressure values ​​during training.

[0027] The base 10 is I-shaped; a slot 14 is formed at the front of the base 10; a through threaded hole is opened on the side wall of the slot 14; a bolt is installed in the threaded hole; the lower part of the bracket 20 is inserted into the slot 14 and fastened to the desired height position in the slot 14 by bolts. The slot is designed mainly to accommodate subjects with different lower leg lengths, and the height position of the electric cylinder can be adjusted according to the subject's condition.

[0028] A recess 12 is formed at the rear of the bracket 10, and a second pressure sensor 13 is disposed in the recess 12.

[0029] A mounting block 31 is fixedly mounted on the output end of the electric cylinder 30; cylindrical mounting rods 32 extend outward from the left and right sides of the mounting block 31 respectively; the round holes at both ends of the belt 40 are correspondingly mounted on the two mounting rods 32. The ends of the mounting rods 32 may have stoppers to prevent the belt from falling off.

[0030] The support 20 is L-shaped.

[0031] During use, the subject places the foot corresponding to the knee to be trained in the recessed area, with the back of the knee resting against the middle of the belt. The electric cylinder is activated via the control unit; the extension and retraction of the cylinder's output corresponds to the subject's knee flexion and extension movements. During training, the force output by the knee joint in the forward-backward direction is measured by a first pressure sensor and displayed on the display unit, while the force output by the knee joint in the vertical direction is measured by a second pressure sensor and displayed on the display unit. The subject adjusts the tension of the knee joint based on the displayed values, keeping the first and second pressure values ​​stable, thus ensuring a stable tension state during flexion and extension movements. Because the knee joint flexes and extends at a uniform speed, the output force of the electric cylinder is essentially consistent with the first pressure value; therefore, the first pressure value can also serve as feedback for adjusting the electric cylinder's output.

Claims

1. A knee joint stability training device, comprising: Base, bracket, electric cylinder, belt, first pressure sensor, control unit, display unit; The base is used to set on the ground; the bracket is set at the front of the base; the electric cylinder is installed on the upper part of the bracket; the output end of the electric cylinder extends forward; the two ends of the belt are respectively provided with through round holes, and the two ends of the belt are aligned and bent into a U-shape. The two ends of the belt can be rotatably connected to the output end of the electric cylinder through their round holes. The middle part of the belt is located above the rear of the base. The first pressure sensor is installed in the middle part of the belt. The first pressure sensor is located at the bend of the U-shape and is used to support the back of the knee joint of the subject during training, so as to measure the force output by the subject against the tension of the belt during the uniform flexion and extension of the knee joint. The electric cylinder includes an electric cylinder drive unit, which is controlled by the control unit to drive the electric cylinder to work; a first pressure sensor feeds back the pressure value it measures as a first pressure value to the control unit, which compares the first pressure value with a preset pressure value and thereby outputs a control command to the electric cylinder drive unit to adjust the output force of the electric cylinder; The display unit is connected to the control unit and displays the first pressure value on it.

2. The knee joint stability training device according to claim 1, characterized in that: It further includes a second pressure sensor; The second pressure sensor is located on the upper surface of the rear of the base and is used to support the foot under the knee to measure the force output by the subject in the vertical direction during the uniform flexion and extension of the knee joint as the second pressure value; the second pressure value is also displayed on the display unit.

3. The knee joint stability training device according to claim 2, characterized in that: The display unit is located at the top of the bracket.

4. The knee joint stability training device according to claim 2, characterized in that: The base is I-shaped; a slot is formed at the front of the base; a through threaded hole is provided on the side wall of the slot; a bolt is installed in the threaded hole; the lower part of the bracket is inserted into the slot and fastened to the desired height position in the slot by the bolt.

5. The knee joint stability training device according to claim 4, characterized in that: The rear part of the bracket has a recessed portion, and the second pressure sensor is disposed in the recessed portion.

6. The knee joint stability training device according to claim 1, characterized in that: A mounting block is fixedly installed on the output end of the electric cylinder; cylindrical mounting rods extend outward from the left and right sides of the mounting block respectively; the round holes at both ends of the belt are correspondingly installed on the two mounting rods.

7. The knee joint stability training device according to claim 4, characterized in that: The support is L-shaped.

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