CN204484137U - Finger muscular strength quantitative measurement instrument - Google Patents

Abstract

The utility model discloses a quantitative measuring instrument for finger muscle strength, which belongs to the technical field of diagnosis. The quantitative measuring instrument for finger muscle strength comprises a muscle strength measuring device and a signal acquisition and processing system. The muscle strength measuring device includes an elastic force-bearing arm and a support and the bottom plate, the support is fixed to the bottom plate, and the elastic force arm is arranged on the end of the support away from the bottom plate to form a cantilever structure, the end of the cantilever structure is provided with a muscle force hole, and the muscle force A finger fixing device is arranged in the force hole. The utility model realizes the quantitative and real-time measurement of finger muscle strength in any direction and movement direction and the measurement of special individual finger muscle strength, and realizes intelligent muscle strength measurement and evaluation through computer-aided calculation and automatic conversion.

Description

Quantitative Measuring Instrument for Finger Muscle Strength

technical field

The utility model belongs to the technical field of diagnosis, in particular to a quantitative real-time measuring instrument for finger muscle strength and motion direction.

Background technique

Hand movement is one of the most important activities of the human body, involving the work and life of patients. Among the changes in finger muscle strength caused by various diseases, the finger movement center occupies the largest area in the cerebral cortex. The movement area of the thumb is equivalent to 10 times the movement area of the entire thigh. The human hand is capable of billions of different movements, all of which are closely linked to brain activity. Muscle strength testing is particularly important in lesions of the muscles, bones, nervous system, especially the peripheral nervous system. Finger muscle strength examination is a commonly used evaluation technique in early diagnosis and treatment of various diseases and rehabilitation medicine. The current muscle strength test refers to the determination of the strength of muscle contraction, and the determination of the contraction force of the muscles or muscle groups during active exercise, so as to evaluate the functional state of the muscles. There are two commonly used clinical muscle strength test methods: manual test (manual test) muscle test, MMT) and instrument inspection. MMT is a simple and most commonly used inspection method. It makes the tested muscles perform standard test actions in a certain posture and position, and observes their ability to complete the action. However, the test results are qualitative and are less affected by the subjective factors of the tester. The degree of cooperation of the subjects will also affect the accuracy of the results.

At present, finger pinch force measurement can be carried out: the pinch force can be measured by pinching the thumb and other fingers relative to the grip meter or pinch meter. Accurate quantitative measurement of finger muscle strength below grade 3 also lacks simple and effective instruments and methods for measuring the muscle strength of each individual finger.

In view of the above problems, it is necessary to develop a measuring device and measuring method with a new structure, which can not only carry out the quantitative measurement of finger muscle strength below grade 3, but also carry out the measurement of special individual finger muscle strength. At the same time, it has the advantages of simple structure, The advantages of convenient operation and accurate measurement.

Utility model content

In view of this, the purpose of this utility model is to provide a quantitative finger muscle strength measuring instrument to solve the problems in the prior art that the finger muscle strength below grade 3 cannot be measured and the special individual finger muscle strength cannot be measured.

The purpose of this utility model is achieved by the following technical solutions:

A quantitative measuring instrument for finger muscle strength, including a muscle strength measuring device and a signal acquisition and processing system, the muscle strength measuring device includes an elastic force-bearing arm, a support and a base plate, the support is fixed to the base plate, and the elastic force-bearing arm It is arranged at the end of the support away from the bottom plate to form a cantilever structure. The end of the cantilever structure is provided with a muscle force receiving hole, and a finger fixing device is arranged in the muscle force receiving hole. The signal acquisition and processing system It includes a fiber grating connected with a muscle strength measuring device, a spectrum analyzer, and a data analysis system.

Further, there are at least two fiber gratings, and they are evenly distributed on the outer surface of the elastic force-bearing arm, which is located in the middle area of the muscle force force-bearing hole.

Further, the opening of the muscle force receiving hole is provided with a limiting hole for fixing the finger fixing device.

Further, the limiting hole is a straight hole, and the finger fixing device includes a finger fixing ring made of magnetic material that is slidably matched with the limiting hole, a magnetic pole that generates magnetic force on the finger fixing ring, and a magnetic switch that controls the magnetic pole. , the magnetic poles are bipolar and symmetrically arranged on the outer surface of the elastic force-bearing arm, the magnetic switch is arranged on one of the poles, and a plurality of finger fixing rings are arranged according to different inner diameters.

Further, the limiting hole is a tapered hole, and the finger fixing device includes a finger fixing ring that can closely match the taper of the limiting hole, and multiple finger fixing rings are arranged according to different inner diameters.

The beneficial effects of the utility model are:

1. The utility model is provided with a cantilever structure. Since the deflection value of the cantilever structure in any direction is the same, the muscle force of the finger in any direction can be obtained by the same process, which makes data processing simpler. The finger muscle strength test can realize the muscle strength measurement of the finger in any direction, avoiding the problems in the prior art that the quantitative measurement of the finger muscle strength below level 3 and the measurement of the special finger muscle strength cannot be carried out. At the same time, it has a structure The advantages of simplicity, convenient operation and accurate measurement.

2. The utility model realizes signal acquisition, computer-aided calculation, automatic conversion and display of measurement results through the signal acquisition and processing system, and can detect abnormal muscle strength, such as increased, decreased, asymmetrical, abnormal muscle strength of a single finger, Vibration frequency, maximum force, minimum force, impact force, change slope, etc., and self-comparison, front-to-back comparison, can dynamically and accurately measure slight changes, and finally realize intelligent muscle strength measurement and evaluation.

Other advantages, objectives and features of the present utility model will be set forth in the following description to some extent, and to some extent, based on the investigation and research below, it will be obvious to those skilled in the art, or can be Get teaching from the practice of the utility model. The objectives and other advantages of the utility model can be realized and obtained through the following description.

Description of drawings

In order to make the purpose, technical solutions and beneficial effects of the utility model clearer, the utility model provides the following drawings:

Fig. 1 is the structural representation of the utility model first embodiment;

Fig. 2 is a schematic structural diagram of the second embodiment of the present invention.

Reference signs: 1-elastic force arm; 2-support; 3-bottom plate; 4-muscle force force hole; 5-finger fixing device; 6-fiber grating; 7-spectral analyzer; 8-data analysis system ; 9-limit hole; 10-finger fixing ring 11-magnetic pole; 12-magnetic switch.

Detailed ways

Preferred embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the utility model, rather than limiting the protection scope of the utility model.

Example 1

As shown in Figure 1, the finger muscle strength quantitative measuring instrument of this embodiment includes a muscle strength measuring device and a signal acquisition and processing system, and the muscle strength measuring device includes an elastic force-bearing arm 1, a support 2 and a base plate 3, and the The support 2 is fixed to the base plate 3, and the elastic force-bearing arm 1 is arranged on the end of the support 2 away from the base plate 3 to form a cantilever structure. The end of the cantilever structure is provided with a muscle force force hole 4, and the muscle force is A finger fixing device 5 is arranged in the force receiving hole 4 , and the signal acquisition and processing system includes a fiber grating 6 , a spectrum analyzer 7 , and a data analysis system 8 connected to a muscle strength measurement device.

The demodulation principle of the fiber Bragg grating sensor adopted in this embodiment: the light with a certain bandwidth will be incident into the fiber grating through the circulator by a wide-spectrum light source (such as SLED or ASE). The qualified light is reflected back, and then sent to the demodulation device through the circulator to measure the reflection wavelength change of the fiber grating. When a fiber Bragg grating is used as a probe to measure the temperature, pressure or stress of the outside world, the grating pitch of the grating itself changes, which causes a change in the reflected wavelength. or stress. The specific derivation is as follows:

The reflected light wavelength λ _B (Bragg wavelength) of the fiber Bragg grating satisfies the following Bragg equation:

λ _B = 2n _eff Λ (2.1)

Among them, λ _B is called Bragg fiber reflection wavelength.

Affected by the temperature and stress environment of the fiber, the reflection wavelength λ _B of the Bragg fiber will change. When the temperature changes ΔT, the Bragg wavelength offset Δλ _B is obtained by calculating the partial derivative transformation according to the formula (2.1):

Δλ _B ＝λ _B {α _Λ +α _n }ΔT (2.2)

here is the thermal expansion coefficient of the fiber; is the thermo-optic coefficient of the fiber.

When the force applied along the fiber direction changes ΔF to produce a stress change Δε, the offset Δλ _B of the Bragg wavelength is

Δλ _B =λ _B {ρ _Λ +ρ _n }Δε (2.3)

here It can be called the elastic deformation coefficient of optical fiber under stress; is the photoelastic coefficient of the fiber.

It can be seen that as long as the offset of Bragg wavelength Δλ _B is accurately measured, the temperature, strain and their variation of the Bragg grating in the fiber can be calculated. In this embodiment, the muscle strength can be calculated only by using formula 2.3 .

In this embodiment, by setting the cantilever structure, since the deflection value of the cantilever structure in any direction is the same, the muscle force of the finger in any direction can be obtained by the same process, which makes the data processing simpler. The force test can realize the measurement of the muscle strength of the finger in any direction, avoiding the problems in the prior art that the quantitative measurement of the finger muscle strength below grade 3 and the measurement of the special finger muscle strength cannot be carried out. At the same time, it has a simple structure, The advantages of convenient operation and accurate measurement.

This embodiment also realizes signal acquisition, computer-aided calculation, automatic conversion and display of measurement results through the signal acquisition and processing system, and can detect abnormal muscle strength, such as increased, decreased, asymmetrical, abnormal muscle strength of a single finger, and shaking Frequency, maximum force, minimum force, impact force, change slope, etc., and self-comparison, front-to-back comparison, can dynamically and accurately measure slight changes, and finally realize intelligent muscle strength measurement and evaluation.

Further, there are at least two fiber gratings 6, and they are evenly distributed on the outer surface of the elastic force arm 1, which is located in the middle area of the muscle force force hole. In this embodiment, there are six, and they are evenly distributed on the elastic force force arm. 1, the deformation around the elastic force arm 1 can be measured, so as to realize the measurement of muscle strength in any direction of the finger without being limited by the direction. At the same time, the fiber grating 6 is arranged on the muscle force of the elastic force arm 1 The middle area of the force-bearing hole 4 makes the measured value closer to the actual deformation and reduces the systematic error caused by fitting.

Further, the opening of the muscle force receiving hole 4 is provided with a limit hole 9 for fixing the finger fixing device, the limit hole 9 is coaxial with the muscle force force receiving hole 4 and has a diameter larger than the muscle force force receiving hole, The finger fixing device 5 can be fixed in the limiting hole 9, and the root of the finger can be fixed on the device through the finger fixing device 5, so as to prevent the movement of the palm or limbs from being superimposed on the shaking of the fingers during measurement, resulting in a large measurement error.

Further, the limiting hole 9 is a straight hole, and the finger fixing device 5 includes a finger fixing ring 10 made of magnetic material that is slidably fitted with the limiting hole, a magnetic pole 11 that generates a magnetic force on the finger fixing ring 10, and an opposing magnetic pole. 11 to control the magnetic switch 12, the magnetic pole 11 is two poles, and is symmetrically arranged on the outer surface of the elastic force arm 1, and the magnetic switch 12 is arranged on one of the poles. When the magnetic switch is opened, the magnetic force will Next, fix the finger fixing ring 10 in the limit hole 9, so that the movement of the finger will not include the movement of the finger fixing ring 10, reduce the measurement error, and make the measurement result more accurate; at the same time, when the magnetic switch 12 is closed, the magnetic force can be removed, It is convenient to take out the finger fixing ring 10. The finger fixing ring 10 is provided with a plurality of different inner diameters to facilitate the measurement of fingers of different thicknesses and the measurement of different patients. Of course, the limiting hole in this embodiment can also be a tapered hole.

Example 2

The difference between this embodiment and Embodiment 1 is that the limiting hole 9 is a tapered hole, and the finger fixing device 9 includes a finger fixing ring 10 that can closely match the taper of the limiting hole, and the finger fixing ring is set according to different inner diameters. Multiple, as shown in Figure 2, this kind of taper fitting structure is simpler, the fitting effect is better, and the operation is more convenient. When in use, only the thrust of fingers can be used to achieve fastening. Other structures are the same as in Embodiment 1, and will not be described here again.

Finally, it is noted that the above preferred embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that it can be described in the form Various changes can be made in the above and in the details without departing from the scope defined by the claims of the present invention.

Claims (5)

1. finger muscle strength quantitative measuring instrument, it is characterized in that: comprise muscle strength measuring device and signal acquisition and processing system, described muscle strength measuring device comprises elastic force-bearing arm, bearing and base plate, described bearing and base plate are fixed, The elastic force-bearing arm is arranged on the end of the support away from the bottom plate to form a cantilever structure. The end of the cantilever structure is provided with a muscle force force hole, and a finger fixing device is arranged in the muscle force force force hole. The signal acquisition and processing system includes a fiber grating connected with a muscle strength measuring device, a spectrum analyzer, and a data analysis system. 2. The quantitative measuring instrument for finger muscle strength according to claim 1, characterized in that: said fiber gratings are provided with at least two, and are evenly distributed on the elastic force arm, on the outer surface of the middle region of the muscle force force hole . 3. The quantitative measuring instrument for finger muscle strength according to claim 1, characterized in that: the opening of the muscle force receiving hole is provided with a limit hole for fixing the finger fixing device. 4. The quantitative measuring instrument for finger muscle strength according to claim 3, characterized in that: the limiting hole is a straight hole, and the finger fixing device includes a finger fixing device made of magnetic material that slides and fits with the limiting hole. ring, a magnetic pole that generates magnetic force on the finger fixing ring, and a magnetic switch that controls the magnetic pole. The magnetic pole has two poles and is symmetrically arranged on the outer surface of the elastic force-bearing arm. The magnetic switch is arranged on one of the poles. A plurality of finger fixing rings are arranged according to different inner diameters. 5. The quantitative measuring instrument for finger muscle strength according to claim 4, characterized in that: the limiting hole is a tapered hole, and the finger fixing device includes a finger fixing ring that can closely match the taper of the limiting hole, and the A plurality of finger fixing rings are arranged according to different inner diameters.