CN210354694U - Use cramp detection alarm device of magnetic localization technique - Google Patents

Abstract

The utility model belongs to the technical field of the mechanical skill and specifically relates to a swimming cramp detection device based on magnetic positioning technique, including shank fixing device, shank fixing device includes knee joint bandage and shank bandage, and triaxial magnetic sensor has been placed to the inside of first waterproof bag, and the inside little magnet of having placed of second waterproof bag. This swimming cramp detection device based on magnetic positioning technique, shank fixing device through setting up can be with triaxial magnetic sensor location in knee joint one side, and fix a position little magnet in shank gastrocnemius one side, be convenient for detect the shank motion, shank fixing device wholly adopts elastic material to make simultaneously, whole size is adjustable, be fit for different crowds and use, and can not influence swimming effect, whether the spasm takes place through the knee joint angle that contraction acceleration or the shank linear velocity sudden change of the muscle that easily takes place the spasm in the motion such as real-time supervision gastrocnemius angle that corresponds, the spasm is in case taken place, send out the police dispatch newspaper to the rescuer immediately.

Description

Use cramp detection alarm device of magnetic localization technique

Technical Field

The utility model relates to the technical field of machinery, specifically be an use cramp detection alarm device of magnetism location technique.

Background

Cramps, i.e., muscle spasms. Muscle spasm is a movement disorder characterized by velocity-dependent, tonic stretch reflex enhancement with tendon reflex exceedingly common, caused by hyperexcitability of stretch reflex. When a muscle is cramped, the muscle becomes significantly stiffer and deformed, often with a strong sensation of pain. Spasm of calf gastrocnemius is usually caused by rapid exercise or working fatigue or severe twisting of the shank, and when the spasm occurs, the gastrocnemius deforms obviously, and the muscle bulges obviously when being normal. Swimming as a sport with very high popularization rate has many health benefits, but at the same time, once cramps on legs occur in the swimming process and timely rescue cannot be achieved, the life safety of swimmers is easily threatened. Compared with professional swimmers, beginners and children have higher probability of cramping during swimming and weaker water, and are high-risk groups which easily lose lives due to cramping. At present, life-saving safety personnel are required to be arranged in swimming places, but the death accident caused by cramping and drowning of swimmers due to carelessness and carelessness of life-saving personnel and incapability of timely rescue often occurs. Therefore, the alarm reminding sent to the lifeguard and other workers at the first time when the cramp occurs is an important measure for greatly reducing drowning in swimming caused by sudden cramp. In view of this, we propose a cramp detection alarm device using magnetic positioning technology.

SUMMERY OF THE UTILITY MODEL

To solve the above problems, an object of the present invention is to provide an alarm method for leg cramp and a device for implementing the same, which can determine whether cramp occurs by monitoring the contraction acceleration of muscles such as gastrocnemius which are easy to generate cramp in motion or the knee joint angle corresponding to the sudden change of the linear velocity of the calf, and immediately send an alarm to a rescuer in case of the cramp occurring. The system is suitable for cramp detection and alarm when the swimmer swims.

In order to achieve the above object, the utility model provides an use cramp detection alarm device of magnetic positioning technique, including shank fixing device, shank fixing device includes knee joint bandage and shank bandage, knee joint bandage internal surface mounting has first waterproof bag, triaxial magnetic sensor has been placed to the inside of first waterproof bag, the internal surface mounting of shank bandage has the second waterproof bag, the inside little magnet of having placed of second waterproof bag, the knee joint bandage with be provided with a plurality of connecting bands between the shank bandage, knee joint bandage one side through knee joint bandage connect cloth with connecting band fixed connection, shank bandage one side through shank bandage connect cloth with connecting band fixed connection.

Preferably, the knee joint bandage and the lower leg bandage are both circular.

Preferably, the size of the knee strap is larger than the size of the calf strap.

Preferably, the size of the three-axis magnetic sensor is matched with the size of the first waterproof bag.

Preferably, the size of the small magnet is matched with the size of the second waterproof bag.

Preferably, the size of the connecting band is matched with the size of the knee joint strap connecting cloth, and the size of the connecting band is matched with the size of the calf strap connecting cloth.

Compared with the prior art, the beneficial effects of the utility model are that:

1. this use cramp detection alarm device of magnetic positioning technique can fix a position triaxial magnetic sensor in knee joint one side through the shank fixing device that sets up to with little magnet location in shank gastrocnemius one side, be convenient for detect the shank motion, shank fixing device wholly adopts elastic material to make simultaneously, whole size is adjustable, is fit for different crowds and uses, and can not influence swimming effect.

2. This use cramp detection alarm device of magnetic localization technique, whether take place the spasm through the knee joint angle that real-time supervision gastrocnemius muscle is easy to take place the muscle's that the spasm takes place in the motion acceleration of contraction or shank linear velocity sudden change correspond, spasm in case takes place, immediately sends out the police dispatch newspaper to the rescuer.

Drawings

Fig. 1 is a schematic structural view of a leg fixing device of the present invention;

FIG. 2 is an overall block diagram of the present invention;

fig. 3 is a circuit diagram of a wireless transmission module according to the present invention;

fig. 4 is a schematic diagram of the permanent magnet positioning module of the present invention;

FIG. 5 is a diagram of a magnetic field positioning model of the present invention;

fig. 6 is a flowchart of the LM algorithm of the present invention;

fig. 7 is a schematic diagram of the alarm module of the present invention.

In the figure: 1. a leg fixing device; 11. a knee joint strap; 12. a shank binding band; 13. a first waterproof bag; 14. a three-axis magnetic sensor; 15. a second waterproof bag; 16. a small magnet; 17. the knee joint bandage is connected with the cloth; 18. the shank bandage is connected with the cloth; 19. and a connecting belt.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Example 1

On one hand, the utility model provides a cramp detection alarm device using magnetic positioning technology, as shown in figure 1, including a leg fixing device 1, the leg fixing device 1 includes a knee joint bandage 11 and a calf bandage 12, a first waterproof bag 13 is installed on the inner surface of the knee joint bandage 11, a three-axis magnetic sensor 14 is placed inside the first waterproof bag 13, a second waterproof bag 15 is installed on the inner surface of the calf bandage 12, a small magnet 16 is placed inside the second waterproof bag 15, a plurality of connecting bands 19 are arranged between the knee joint bandage 11 and the calf bandage 12, one side of the knee joint bandage 11 is fixedly connected with the connecting band 19 through a knee joint bandage connecting cloth 17, one side of the calf bandage 12 is fixedly connected with the connecting band 19 through a calf bandage connecting cloth 18, the knee joint bandage 11 and the calf bandage 12 are both in a circular ring shape, the size of the knee joint bandage 11 is larger than that of, the size of the three-axis magnetic sensor 14 is matched with that of the first waterproof bag 13, the size of the small magnet 16 is matched with that of the second waterproof bag 15, the size of the connecting belt 19 is matched with that of the knee-joint-strap connecting cloth 17, and the size of the connecting belt 19 is matched with that of the calf-strap connecting cloth 18.

In this embodiment, the knee joint bandage 11 and the calf bandage 12 are made of elastic cloth, and the materials thereof have good elasticity and good ventilation effect, and are tightly bound at the knee joint of the user through the knee joint bandage 11, and are tightly bound at the calf of the user through the calf bandage 12, so that the leg fixing device 1 is fixed at the leg position of the user.

Further, first waterproof bag 13 and second waterproof bag 15 all adopt the PVC plastic film material to make, and its material has waterproof characteristic, and the material is light, and stand wear and tear effectually.

Specifically, the first waterproof bag 13 is fixed to the knee joint bandage 11 in an adhesion manner, so that the first waterproof bag 13 can be conveniently installed on one side of the knee joint bandage 11, the second waterproof bag 15 is fixed to the lower leg bandage 12 in an adhesion manner, and the second waterproof bag 15 can be conveniently installed on one side of the lower leg bandage 12.

In addition, the connecting band 19 is made of an elastic cloth material, so that the connecting band 19 has good elasticity, and the length of the connecting band 19 can be conveniently adjusted, and the distance between the knee joint strap 11 and the calf strap 12 can be further adjusted.

In addition, the fixing manner of the knee joint strap connecting cloth 17 and the connecting band 19 can be any one of the fixing manners in the prior art, in this embodiment, it is preferable to fix the knee joint strap connecting cloth 17 by sewing with needle thread, and the other side of the knee joint strap connecting cloth 17 is fixed on the knee joint strap 11 by sewing with needle thread, so that the connecting band 19 can be fixed on one side of the knee joint strap 11.

It should be noted that the fixing manner of the lower leg strap connecting cloth 18 and the connecting band 19 can be any one of the fixing manners in the prior art, in this embodiment, it is preferable to fix the lower leg strap connecting cloth 18 and the connecting band 19 by sewing with needle thread, and the other side of the lower leg strap connecting cloth 18 is fixed on the lower leg strap 12 by sewing with needle thread, so as to fix the connecting band 19 on one side of the lower leg strap 12.

When the cramp detection alarm device using the magnetic positioning technology in the embodiment is worn on the leg fixing device 1, the user penetrates the leg from the knee joint bandage 11 side, and makes the foot of the user penetrate from the calf bandage 12, and ties up the knee joint bandage 11 on the knee joint side of the user, so that the three-axis magnetic sensor 14 inside the first waterproof bag 13 is pasted on the knee joint side, and ties up the calf bandage 12 on the calf gastrocnemius of the user, so that the small magnet 16 inside the second waterproof bag 15 is pasted on the calf gastrocnemius side, the three-axis magnetic sensor 14 can be positioned on the knee joint side through the arranged leg fixing device 1, and the small magnet 16 is positioned on the calf gastrocnemius side, thereby facilitating the detection of the leg movement, meanwhile, the whole leg fixing device 1 is made of elastic materials, and the whole size is adjustable, and is suitable for different people to use, and the swimming effect is not influenced.

Example 2

As the utility model discloses a second kind of embodiment, for the convenience of realizing the data transmission between permanent magnetism orientation module and the alarm module, the utility model discloses personnel set up wireless transmission module, as an preferred embodiment, as shown in fig. 2, still are provided with permanent magnetism orientation module and alarm module in the triaxial magnetic sensor 14, and permanent magnetism orientation module passes through wireless transmission module and alarm module and realizes data transmission.

In this embodiment, the wireless transmission module includes a transmitting end and a receiving end, the transmitting end performs a/D conversion and wireless transmission through the single-chip microcomputer, the receiving end receives data through nRF24L01, and then sends the data to the STC12C5a60S2 single-chip microcomputer for display and analysis, all configuration operations of the wireless module nRF24L01 are completed through SPI, and 30B configuration words are common, and an enhanced shockburst transceiving mode is generally adopted, in which programming of the system is simpler and stability is higher, the configuration words of the enhanced shockburst enable nRF24L01 to process a radio frequency protocol, and after configuration is completed, in the working process of nRF24L01, switching between a receiving mode and a transmitting mode can be realized only by changing the content of the lowest byte during the operation process of the nRF24L01

Example 3

As a third embodiment, in order to facilitate the location of the coordinate and the direction of knee joint and shank, the utility model discloses the personnel set up permanent magnetism orientation module, as a preferred embodiment, permanent magnetism orientation module includes coordinate orientation module, magnetic field orientation module, continuous orientation module and data processing module, coordinate orientation module is used for fixing a position the coordinate and the direction of knee joint and shank, magnetic field orientation module is used for confirming the spatial position and the magnetic moment vector of permanent magnet, continuous orientation module is used for in the shank motion process, fix a position knee joint and shank in succession, data processing module is used for integrating and exporting the data of the coordinate and the direction of knee joint and shank.

In this embodiment, the coordinate positioning module uses the three-axis magnetic sensor 14 as the origin of coordinates to position the corresponding small magnet 16, the positioning result includes coordinates and a direction, the three-axis magnetic sensor 14 is placed at the knee joint to perform spatial positioning on the small magnet 16, the distance between the small magnet 16 and the three-axis magnetic sensor 14 is known to be h0, and the three-axis magnetic sensor 14 is used as the origin of coordinates to solve the spatial position (x) of the small magnet 16₀，y₀，z₀) The coordinates of the magnet a are (a0, b0, c0) and the direction is (α 0, β 0, γ 0).

Further, as shown in fig. 5, in the magnetic field positioning module, M is a position of the permanent magnet, R is a magnetic moment of the permanent magnet, and according to the magnetic dipole model, magnetic induction at an observation point a (x, y, z) in space is:

in the formula (I), the compound is shown in the specification,

specifically, the continuous positioning module adopts an LM algorithm, and the codes are set as follows:

cal_func(x,t,y,func)；//f＝y-f(x,t)

cal_jacob(x,t,jacob)；//j＝f'(x,t)

cal_hessian(jacob,hessian)；//A＝j(T)*j

cal_grad(jacob,func,grad)；//g＝j(T)*f

bFound ═ (cal _ max (grad) < ═ e 1); the general initial value of// end flag is 0 unless the initial solution is the optimized solution

miu cal _ max2 (sessian) × 1 e-6; initial value of/falling length

for(n＝0；n<500&&！bFound；n++)

{

cal_hess_miu(hessian,miu,hess_miu)；//A'＝A+miu*I

gauss_jordan(hess_miu,grad,h_lm)；//h_lm＝h^-1*grad

if(cal_norm(h_lm)<＝e2*(e2+cal_norm(x)))

bFound＝true；

else

{

for(i＝0；i<N；i++)

x_new[i]＝x[i]+h_lm[i]；//x_new＝x+h_lm

objFi＝cal_objFi(func)；//φ＝∑f^2

cal_func(x_new,t,y,fun_new)；//f_new＝y-f(x_new,t)

objFi_new＝cal_objFi(fun_new)；//φ_new＝∑f_new^2

rou＝(objFi-objFi_new)/cal_l(h_lm,grad,miu)；

if(rou>0)

{

for(i＝0；i<N；i++)

x[i]＝x_new[i]；

cal_func(x,t,y,func)；//f＝y-f(x,t)

cal_jacob(x,t,jacob)；//j＝f'(x,t)

cal_hessian(jacob,hessian)；//A＝j(T)*j

cal_grad(jacob,func,grad)；//g＝j(T)*f

bFound＝cal_max(grad)<＝e1；

miu*＝(1.0f/3.0f)>(1-pow(2*rou-1,3))？(1.0f/3.0f):(1-pow(2*rou-1 ,3))；

v＝2；

cout<<n<<"\t"<<miu<<"\t"<<cal_max(grad)<<"\t"<<objFi<<endl；

}

else

{

miu*＝v；

v*＝2；

cout<<n<<"\t"<<miu<<"\t"<<cal_max(grad)<<"\t"<<objFi<<endl；

}

}

}

It should be noted that the LM algorithm flow is shown in fig. 6, and the steps are as follows:

(1) defining a function

Given an initial value x⁽⁰⁾Setting an error limit epsilon, an iteration parameter mu, a scaling factor β and a maximum iteration number k_maxThe current iteration number k is 1.

(2) Calculating step length h, calculating x^(k+1)＝x^(k)+ h, calculation

(3) And updating the mu. If F (x)^(k+1))＞F(x^(k)) Then it indicates that the nearest one of the solutions is farther away, and then the value of μ is increased, where μ is μ ═ μβ, making the algorithm approach the fastest descent method to ensure the global convergence, if F (x)^(k+1))＜F(x^(k)) It indicates that the closest solution is closer to the optimal solution, and then the value of mu is decreased,

the algorithm is closer to a Gauss-Newton method, and the convergence speed is accelerated.

(4) When k is equal to k_maxOr

When so, the algorithm terminates; otherwise, k is k +1, and the step 2 is returned.

When the cramp detection alarm device using the magnetic positioning technology in the embodiment detects leg movement, the coordinate and the direction of the knee joint and the lower leg are positioned through the coordinate positioning module, the spatial position and the magnetic moment vector of the permanent magnet are determined through the magnetic field positioning module, the knee joint and the lower leg are continuously positioned through the continuous positioning module in the leg movement process, and data of the coordinate and the direction of the knee joint and the lower leg are integrated and output through the data processing module.

Example 4

As the utility model discloses a fourth embodiment, for the convenience when taking place the cramp, timely warning that sends out reminds, the utility model discloses personnel set up alarm module, as an preferred embodiment, as shown in fig. 7, alarm module includes signal intercepting module, integral algorithm module, normal value range algorithm module, alarm value decision module and audio alert module, signal intercepting module is used for carrying out the intercepting to the signal that permanent magnetism orientation module measured according to the time, integral algorithm module is used for carrying out the integral processing to the signal of intercepting, normal value range algorithm module is used for confirming normal worth the scope, alarm value decision module is used for confirming the scope of alarm value, audio alert module is used for sending out audio alert when surpassing the alarm value.

In this embodiment, the signal intercepting module is used for acquiring a spatial displacement data signal of gastrocnemius on a plane perpendicular to a calf bone, and the specific steps are as follows:

(1) establishing a space rectangular coordinate system by taking the position of the three-axis magnetic sensor 14 as a coordinate origin to obtain a space position (a) of the small magnet 16₀，b₀，c₀)；

(2) When cramping, muscle spasm generates obvious deformation towards the central contraction, the deformation protrudes outwards, the displacement of the small magnet 16 in the Z direction is obviously increased, the deformation in the X and Y directions is very small and can be approximately ignored, and the spatial position of the small magnet 16 is (a)₁，b₁，c₁)；

(3) Calculating S as x + y + z at intervals of 0.5S, and calculating the sum of S and y + z when S is greater than S_n+1-S_n|≥5％S_nWhen the signal is intercepted, the signal is cut by t being 3 s.

Further, the integral algorithm module has the following formula:

specifically, the normal value range algorithm module can obtain the delta through analysis of a plurality of groups of experimental data₁、δ₂、δ₃Within the normal value range of (d), let δ be (δ ∈)_L，δ_H)。

It is worth to be noted that the alarm value determination module is expressed as: when cramp occurs, muscle contracts rapidly and violently, displacement becomes large obviously, and the obtained delta' is beyond the normal range of delta obviously. Let | delta' -delta_HMu is calculated as₁、μ₂、μ₃Three sets of data, for μ₁、μ₂、μ₃And carrying out weighted summation to obtain a parameter lambda, and when lambda is more than or equal to epsilon, judging that the cramp occurs, namely, obtaining an alarm value.

When the alarm module of the cramp detection alarm device using the magnetic positioning technology works, leg movement signals detected by the permanent magnet positioning module are transmitted into the alarm module through the wireless transmission module, signals measured by the permanent magnet positioning module are intercepted according to time through the signal intercepting module, the intercepted signals are subjected to integral processing through the integral algorithm module, a normal value range is determined through the normal value range algorithm module, the range of an alarm value is determined through the alarm value determination module, and the voice alarm module is used for sending out voice alarm when the alarm value is exceeded.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (6)

1. The utility model provides a swimming cramp detection device based on magnetic localization technique, includes shank fixing device (1), its characterized in that: leg fixing device (1) includes knee joint bandage (11) and shank bandage (12), knee joint bandage (11) internal surface mounting has first waterproof bag (13), triaxial magnetic sensor (14) have been placed to the inside of first waterproof bag (13), the internal surface mounting of shank bandage (12) has second waterproof bag (15), little magnet (16) have been placed to second waterproof bag (15) inside, knee joint bandage (11) with be provided with a plurality of connecting bands (19) between shank bandage (12), knee joint bandage (11) one side through knee joint bandage connecting cloth (17) with connecting band (19) fixed connection, shank bandage (12) one side through shank bandage connecting cloth (18) with connecting band (19) fixed connection.

2. A swimming cramp detection apparatus based on magnetic positioning technology according to claim 1, characterized in that: the knee joint bandage (11) and the lower leg bandage (12) are both circular.

3. A swimming cramp detection apparatus based on magnetic positioning technology according to claim 1, characterized in that: the size of the knee joint strap (11) is larger than that of the calf strap (12).

4. A swimming cramp detection apparatus based on magnetic positioning technology according to claim 1, characterized in that: the size of the three-axis magnetic sensor (14) is matched with that of the first waterproof bag (13).

5. A swimming cramp detection apparatus based on magnetic positioning technology according to claim 1, characterized in that: the size of the small magnet (16) is matched with the size of the second waterproof bag (15).

6. A swimming cramp detection apparatus based on magnetic positioning technology according to claim 1, characterized in that: the size of the connecting band (19) is matched with that of the knee joint bandage connecting cloth (17), and the size of the connecting band (19) is matched with that of the calf bandage connecting cloth (18).

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