Wearable human body joint angle measurement mechanism

Abstract

The invention discloses a wearable human body joint angle measurement mechanism. The wearable human body joint angle measurement mechanism comprises a first clamping groove, a second clamping groove, a first elastic rope, a second elastic rope, a flexible substrate and a resistance card, wherein the flexible substrate cannot expand and contract but can freely bend; the upper end surface of the resistance card is fixedly connected with the bottom surface of the flexible substrate, and the resistance value can change along with the bending angle; and two ends of the flexible substrate are respectively and fixedly connected with the first clamping groove and the second clamping groove through the first elastic rope and the second elastic rope. The wearable human body joint angle measurement mechanism disclosed by the invention can measure the joint bending angle, has high interference resistance and high adaptability, and is low in cost, free from the influence of the using environment, light, portable and wearable, and free moving of joints of a human body is not influenced.

Description

technical field [0001] The invention relates to the field of measuring limb joint bending angles, in particular to a wearable human body joint angle measuring mechanism. Background technique [0002] The bending angle of limb joints is mainly measured by machine vision, optical fiber, inertial sensor, exoskeleton and bending resistance. [0003] The method of measuring by machine vision requires a set of expensive and not easy to carry machine vision sensing equipment, and the joints of the limbs can only be measured within the field of view of the equipment, and are easily disturbed by factors such as the environment and light, affecting the limbs Accuracy of joint measurements. [0004] The method of measuring through optical fiber can accurately measure the bending angle of limb joints, but the optical fiber is expensive. [0005] The bending angle can be obtained by calculating the gravitational acceleration and angular velocity measured by the inertial sensor. However...

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Problems solved by technology

[0003] The method of measuring by machine vision requires a set of expensive and not easy to carry machine vision sensing equipment, and the joints of the limbs can only be measured within the field of view of the equipment, and are easily disturbed by factors such as the environment and light, affecting the limbs Accuracy of joint measurements

[0004] The method of measuring through optical fiber can accurately measure the bending angle of limb joints, but the optical fiber is expensive

[0005] The bending angle can be obtained by calculating the gravitational acceleration and angular velocity measured by the inertial sensor, but this type of sensor is susceptible to electromagnetic wave interference in the environment, which causes the measured bending angle to be inaccurate

[0006] The method of measuring through the exoskeleton requires the human body to wear the exoskeleton equipment. The exoskeleton equipment is generally thick, difficult to wear and will affect the free movement of the human joints.

[0007] The way of measuring by bending resistance, due to the inflexibility of bending resistance, there will be problems when measuring the bending angle of limb joints, figure 1 (a), figure 1 (b) respectively represent the schematic diagrams of the bending resistance applied to the angle measurement when the knee joint is bent and straightened, such as figure 1 (a), figure 1 As shown in (b), when the knee joint is bent at 90 degrees, the bending resistance can be well attached to the surface of the knee joint to measure the bending angle of the knee joint. Sex, the bending resistance will gradually bulge and cannot be tightly attached to the surface of the knee joint, resulting in inaccurate measurement of the bending angle, such as figure 1 As shown in (b), when the knee joint is straightened, the actual angle is 0 degrees, and the bending resistance is still raised and bent, which cannot truly reflect the state of the knee joint straightened

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