CN201200503Y - Three-dimensional device for measuring centre of mass of prosthetic limb - Google Patents

Abstract

The utility model relates to an artificial limb three-dimensional mass center measuring device comprising a rotary clamp, a clamp holder, bearing disks and a base. The utility model is characterized in that the artificial limb three-dimensional mass center measuring device also comprises three weighting sensors, a data acquisition module and a computer processing system, wherein the rotary clamp and the clamp holder are arranged on one of the bearing disks, the bearing disks are arranged on the three weighting sensors, the three weighting sensors are fixed on the base and transfer the data of measured opposite force to the data acquisition module and the computer processing system, and then the data is processed by a computer to work out the quality of the artificial limb and the coordinate of the mass center. The utility model has simple structure and convenient and easy operation, and can accurately measure the quality of the artificial limb and the coordinate of the mass center. The utility model provides the measuring device with double functions of measuring and testing as well as research and development. The same measuring principle can be applied to mass center measuring devices of other types of complex objects.

Description

The three-dimensional centroid measuring device of artificial limb

Technical field

This utility model relates to a kind of centroid measuring device, particularly a kind of determinator that is used for the three-dimensional barycenter of artificial limb.

Background technology

In the existing national standard, be primarily aimed at the crudy of artificial limb at prosthetic product.In the artificial limb industry, the device that artificial limb centroid is measured also is in space state at home.

Modern prosthetic product makes artificial limb have better bionic function by adopting new material, improve the kind of drive, improving means such as intelligent level.And in order to make artificial limb and strong limb more approaching, further minimizing patients with amputation is the difference on physiology and mental impression to artificial limb and strong limb, except it is had the characteristics such as lightweight, high strength, high-performance, also should make the weight of artificial limb each several part consistent, just make artificial limb reach static balance with center of gravity and strong limb each several part.In order to make wearing artificial limb person can recover normal person's limb function to greatest extent, artificial limb must have reliable stability, to keep the equilibrium function and the good gait of health.

The centroid position of regular shape uniform distribution object can obtain by calculating, but for complex-shaped irregular object as artificial limb, just calculates quite trouble.

Summary of the invention

This utility model is to provide a kind of quick, simple and easy and obtain artificial limb quality and centroid position accurately, with the three-dimensional centroid measuring device of the artificial limb that discloses various artificial limb equilibrium function characteristics.

In order to achieve the above object, the technical scheme that this utility model adopted is: the three-dimensional centroid measuring device of a kind of artificial limb, comprise rotatable clamp and clamping fixture seat, the load-bearing disk, base, be characterized in: also comprise three LOAD CELLSs, data acquisition module and computer processing system, rotatable clamp and clamping fixture seat place on the load-bearing disk, the load-bearing disk then is shelved on three LOAD CELLSs, three LOAD CELLSs are fixed on the base, and the transfer of data that will measure support reaction is calculated the quality and the center-of-mass coordinate of artificial limb to data acquisition module and computer processing system by computer processing data.

The diameter of load-bearing disk is 450mm; It is on the circumference of 400mm that three LOAD CELLS RA, RB, RC are fixed on base 4 diameters, and is on three summits that connect equilateral triangle in this circumference.

Substantive distinguishing features and the remarkable advantage that the utlity model has are: the utlity model has simple in structurely, convenience operation can be convenient, measure the quality and the center-of-mass coordinate of artificial limb accurately.This utility model is a determinator that has test, research and development dual-use function concurrently.Same measuring principle extends in the centroid measuring device of other complex forms object.

Description of drawings

Fig. 1 is anchor clamps figure of the present utility model;

Fig. 2 is a load-bearing pie chart of the present utility model;

Fig. 3 is three-dimensional center-of-mass coordinate measuring principle figure;

Fig. 4 is a structural upright sketch map of the present utility model;

Fig. 5 is a front view of the present utility model;

Fig. 6 is the left view of Fig. 5;

Fig. 7 is the vertical view of Fig. 5.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment this utility model is further described.

To shown in Figure 7, the three-dimensional centroid measuring device of artificial limb of the present utility model comprises anchor clamps (rotatable clamp and clamping fixture seat) 1, load-bearing disk 2, three LOAD CELLSs 3, base 4, data acquisition module 5 and computer processing systems 6,7 as Fig. 4.

Whole clamping fixture seat places on the load-bearing disk 2 together with rotatable clamp 1,2 in disk is shelved on three LOAD CELLSs 3, three LOAD CELLSs 3 are fixed on the base 4, three LOAD CELLSs 3 are measured support reaction, and its measurement data is transferred to data acquisition module 5 and computer processing system 6, calculate the quality and the center-of-mass coordinate of artificial limb by computer 6 deal with data.

This utility model is based on the static weighing technology, by the equilibrium relation equilibrium establishment Equation for Calculating of power and moment between support reaction and the gravity, determines quality and centroid position.

Quality is the prosthetic weight p=mg of m, and it is clipped in the anchor clamps of an optional dress, and these anchor clamps can be around x axle rotation (Fig. 1) in clamping fixture seat.It is on the load-bearing disk 2 of 450mm that whole clamping fixture seat places a diameter together with rotatable clamp 1.2 in disk is shelved on R _A, R _B, R _COn three LOAD CELLSs 3.R _A, R _B, R _CIt is on the circumference of 400mm that three LOAD CELLSs 3 are fixed on base 4 diameters, and is on three summits that connect equilateral triangle in this circumference.(Fig. 2)

If the weight of anchor clamps and clamping fixture seat 1 and load-bearing disk 2 can be disregarded, then active force (prosthetic weight) p=mg and end reaction R _A, R _B, R _CForm space parallel power system, wherein a R _A, R _B, R _CNumerical value can directly read by LOAD CELLS.

In Fig. 3 left side, p is a prosthetic weight, and it acts on the center of gravity (barycenter) of artificial limb and locates, establish its coordinate in the xyz coordinate system for (x, y, z), R _AH, R _BH, R _CHIt then is the end reaction that records by LOAD CELLS.Can get by the force system in equilibrium condition:

∑z＝0 R _AH+R _BH+R _CH-P＝0

P＝R _AH+R _BH+R _CH

$m=\frac{R_{\mathrm{AH}}+R_{\mathrm{BH}}+R_{\mathrm{CH}}}{g}$ Be the artificial limb quality.

${\mathrm{\&Sigma;<figure-callout\; id="1"\; label="m\; y"\; filenames="Y200820058101E00091.png"\; state="\{\{state\}\}">m</figure-callout>}}_{y_{}}=0$ $R_{\mathrm{AH}}100\sqrt{3}+R_{\mathrm{CH}}200\sqrt{3}-P(x+100\sqrt{3})=0$

${\mathrm{\&Sigma;m}}_{x_1}=0$ R _AH300-P(y+100)＝0

$\left\{\begin{array}{c}x=\frac{R_{\mathrm{AH}}100\sqrt{3}+R_{\mathrm{CH}}200\sqrt{3}}{P}-100\sqrt{3}\\ y=\frac{R_{\mathrm{AH}}300}{P}-100\end{array}\right.$

(x y) is the centroid position of artificial limb in the xoy plane.But barycenter does not obtain as yet at the position of short transverse mark z.In order to obtain z, with anchor clamps around x axle half-twist (Fig. 3 right side), so moving coordinate system position this moment is by the y level, z upwards becomes the z along continuous straight runs, and y vertically downward, tested artificial limb also upwards transfers level (but the tiptoe direction is consistent with z axle forward all the time) to by tiptoe, and this moment, three support reaction numerical value became R _AV, R _BV, R _CV, by ${\mathrm{\&Sigma;m}}_{x_1}=0,$ R _AV300-P (z+100)=0, thus $z=\frac{R_{\mathrm{AV}}300}{P}-100,$ Be the short transverse coordinate of barycenter.

Claims (3)

1. the three-dimensional centroid measuring device of an artificial limb, comprise rotatable clamp and clamping fixture seat (1), load-bearing disk (2), base (4), also comprise three LOAD CELLSs (3), data acquisition module (5) and computer processing system (6,7), it is characterized in that described rotatable clamp and clamping fixture seat (1) place on the load-bearing disk (2), described load-bearing disk (2) then is shelved on three LOAD CELLSs (3), three LOAD CELLSs (3) are fixed on the base (4), and the transfer of data that will measure support reaction is calculated the quality and the center-of-mass coordinate of artificial limb to data acquisition module (5) and computer processing system (6) by computer (6) deal with data.

2. the three-dimensional centroid measuring device of artificial limb according to claim 1, the diameter that it is characterized in that described load-bearing disk (2) is 450mm.

3. the three-dimensional centroid measuring device of artificial limb according to claim 1 is characterized in that it is on the circumference of 400mm that described three LOAD CELLSs (3) are fixed on base (4) diameter, and is on three summits that connect equilateral triangle in this circumference.

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