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Non-invasive measurement method of wrist joint axis motion model

A technology of motion models, measurement methods, applied in the fields of ergonomics and measurement

Active Publication Date: 2018-03-16
BEIJING UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Non-invasive measurement uses marking points to be placed on the surface of human skin for measurement, so non-invasive measurement reduces the damage to the human body to a certain extent, but non-invasive measurement is greatly affected by skin movement

Method used

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  • Non-invasive measurement method of wrist joint axis motion model
  • Non-invasive measurement method of wrist joint axis motion model
  • Non-invasive measurement method of wrist joint axis motion model

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Experimental program
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Embodiment

[0049] The specific steps of the present invention are as follows:

[0050] 1. Data measurement

[0051] Such as figure 1 As shown, 8 marker points are placed on the tester's hand and forearm, and the positions of the 8 marker points are collected by the vicon optical motion capture system. Take flexion and extension exercises as an example. During the experiment, when collecting flexion / extension exercise data, the wrist moves from flexion to extension for three cycles.

[0052] At time t, the positions of the 8 mark points are:

[0053] P 1 (235.6984 219.5886 960.4167),P 2 (236.211 295.7337 957.716),

[0054] P 3 (194.9982 258.908 957.5391),P 4 (273.4254 256.3104 959.5434),

[0055] P 5 (180.4009 409.6366 942.4073),P 6 (233.7286 467.6213 947.0558),

[0056] P 7 (235.792 412.195 946.8046),P 8 (178.0265 466.1292 942.5173).

[0057] From equation (1), the forearm local coordinate system O 1 (9) Origin:

[0058] O 1 (235.0832 257.6352 958.8038), x, y, z axis is: O 1x (0.9991,-0.0331,0.0255)...

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Abstract

The invention, which belongs to the field of ergonomic and measurement technologies, discloses a non-invasive measurement method of a wrist joint axis motion model. The method comprises the followingthree steps: (1), motion data of a wrist joint are collected; to be specific, a flange is bound to each of a forearm and a hand respectively and four marking points are pasted to each flange to prevent mutual interference between the marking points, the flanges of the forearm and the hand are away from the wrist joint as much as possible, and the flange of the forearm is fixed on a lifting platform; (2), a wrist joint axis motion model is established; to be specific, the forearm and the hand are viewed as rigid bodies, and a two-freedom-degree spatial connecting lever mechanism is established;and (3), a wrist joint motion axis pose is calculated; to be specific, on the basis of the collected wrist joint motion data, a spatial vector closed-loop equation is constructed and parameters of the wrist joint axis motion mode are optimized by using an matlab optimization tool box. With the method provided by the invention, an axis pose of the wrist joint motion at a certain time is obtained accurately; and a theoretical basis is provided for an artificial limb design and a design of a wrist joint rehabilitation device.

Description

Technical field [0001] The present invention relates to the field of human engineering and measurement, in particular to a non-invasive wrist joint axis motion model measurement method. Background technique [0002] In the field of ergonomics and metrology, the model of wrist joint axis motion is very important. After reviewing the literature, it is found that the wrist joint model is two oblique and disjoint axes, that is, there is a certain angle between the wrist joint flexion, extension and extension axis. And distance. The establishment of a wrist joint model can provide a theoretical basis for the design of artificial limbs and wrist joint rehabilitation devices on the one hand, and on the other hand, it can also be used as input to evaluate the functional evaluation of human wrist joints. The current wrist joint measurement methods are divided into invasive and non-invasive methods. Invasive measurement is often used to directly act on the bones with markers. Because of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
CPCG01B11/24
Inventor 李剑锋高亚楠张雷雨张春召李国通张凯周帅锋
Owner BEIJING UNIV OF TECH
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