CN110141486B - Improved electromagnetic pulse wave therapeutic apparatus - Google Patents

Abstract

The invention discloses an improved electromagnetic pulse wave therapeutic apparatus, which comprises a magnetic core and a coil, wherein the coil comprises a hollow bobbin and a lead wound on the hollow bobbin, the magnetic core is at least partially made of a permanent magnetic material, and the Curie temperature of the permanent magnetic material is not lower than 80 ℃; the front end of the magnetic core is fixed with a striking head, and the magnetic core can move along the axis in the hollow spool; and a first spring is coaxially arranged between the impact head and the transmission rod. Through the improvement and optimization of the structure and materials of the existing electromagnetic pulse wave therapeutic apparatus, the energy efficiency ratio is improved, the temperature rise rate is reduced, the single use time is prolonged, and the use strength of clinical treatment is met.

Description

Improved electromagnetic pulse wave therapeutic apparatus

[ technical field ] A method for producing a semiconductor device

The invention belongs to the technical field of medical instruments, and particularly relates to an improved electromagnetic pulse wave therapeutic apparatus.

[ background of the invention ]

Dislocation or other disorders or subluxation of the spine and skeleton of the human body can lead to musculoskeletal discomfort and various associated symptoms for which the application of low frequency mechanical waves (typically 2-100Hz) to affected areas has been proven to be an effective treatment in clinical trials (see: lier, liongwen, Liaoyun, Qi hong, Liufei, Zhang acass. Pulstar for supraspinatus calcified myositis 45 cases of clinical report [ J ]. journal of aerospace medicine, 2016, 27 (02): 271) 272.). The current low-frequency mechanical wave generator mainly has the following two forms: 1. a sine wave generator; 2. a pulse wave generator.

The sine wave generator mainly adopts a motor as power and is divided into an eccentric wheel type generator and a connecting rod type generator according to the conversion mode. For example, patent documents CN2341627Y and CN2254745Y disclose an eccentric wheel type sine wave generator, which is driven by a motor to rotate an eccentric wheel to generate vibration and output, and since the vibration locus is circular, the projection in each direction in the plane is a sine wave; however, the vibration generated by the eccentric wheel can directly act on the rotating shaft of the motor, which is not beneficial to the service life of the motor bearing, and the structure is limited by the mass of the eccentric wheel and the power of the motor, the power density of the structure is not very high, and the structure is generally applied to civil massage health care equipment and is difficult to meet the medical treatment application. Patent documents CN205964432U and CN204618806U disclose a crankshaft-link type sine wave generator, in which a motor drives a crankshaft link to move, and one end of the link is constrained on a straight track, and the circular motion output by the motor is projected in one direction to generate sine wave type linear vibration. For the sine wave generator, it is advantageous that the rotor motor is used as the power source, and the tail end of the rotor output shaft can be conveniently provided with fan blades to cool the coil, such as the vibration therapeutic device disclosed in patent document CN86101310A, so the heat dissipation of the generator is not a problem in general; however, the disadvantages are also evident: when the mass of the sine wave generator and the hand-held force of an operator are fixed, the force acting on the human body is only related to the output frequency (the amplitude is fixed, the acceleration is the second derivative of the position function, and the maximum value is obtained at the zero crossing point of the position), so the frequency and the force of the sine wave generator cannot be independently adjusted, the higher the frequency is, the larger the output force is, and the smaller the output force is vice versa. This inability to adjust individually between frequency and force makes it inflexible to use and difficult to meet a wide variety of therapeutic needs.

A pulse wave generator was first found in US5632765A, which discloses a manually powered pulse wave therapy device to replace the traditional manual massage of the spine, and the instantaneous impact force of up to 400N can be provided by manually pushing and pulling a spring to store energy and then release the energy in a concentrated manner. However, such devices have the disadvantage that manual energy input is still required, causing fatigue to the operator; and is limited by the energy storage structure, and it is difficult for the operator to continuously output the pulse wave at a certain frequency (for example, above 2 Hz), so that the device is not widely accepted in the market.

At present, the common pulse wave generating devices mainly include mechanical wave conduction type and electromagnetic type. Mechanical wave conduction type pulse wave generators, such as those disclosed in patent documents CN202982589U and CN104983557A, each comprise a main cavity body capable of generating pulse waves and a pulse wave output head for outputting the pulse waves to a human body, wherein the main cavity body (such as an air cylinder) generates mechanical waves in the form of pulses, and the mechanical waves are transmitted to the pulse wave output head through a medium (such as water or air); however, the transmission pipeline of such a device requires strict tightness and is limited by the conductive property of the medium, the pulse wave generated by such a device usually does not exceed 20Hz, otherwise the energy of the wave is seriously lost in the transmission process of the medium, and the body generating the mechanical wave is usually large in volume, so that the whole machine cannot be miniaturized and portable.

An electromagnetic pulse wave generator, for example, US8083699B2, uses a transistor to output pulse current to a coil of a pulse wave output head, and then a magnetic field generated by the coil drives an iron core therein to vibrate, so as to convert the electric pulse into mechanical pulse wave; in the process, the electric energy is converted into mechanical energy and heat energy, wherein the heat energy mainly comes from copper loss of the coil and iron loss of the iron core.

Compared with the two pulse wave generators, the two pulse wave generators can respectively adjust the output frequency and force, and the electromagnetic pulse generator has the advantages that the size can be small, various processes of the existing electronic products are mature, and the pulse frequency is flexible and controllable; the electromagnetic pulse wave generator has the disadvantages that heat energy is continuously accumulated on the coil and the iron core, and the damage of components can be caused by overhigh temperature, so the electromagnetic pulse wave generator usually cannot work continuously, and the equipment needs to rest for a period of time after being used for a period of time to be used again.

Due to the flexible and adjustable pulse frequency and strength of the electromagnetic pulse wave generator, the electromagnetic pulse vibration therapeutic apparatus product formed by the electromagnetic pulse wave generator has been widely accepted by the market and is applied to clinical use in a plurality of hospitals. However, their inherent drawbacks are also exposed in use. For example, the improved electromechanical adjusting device disclosed in patent document CN101437482A, whose similar product is already in clinical use, has its coil exterior cooled by natural heat dissipation, and its housing is made of plastic material as a whole. When the device is actually used indoors at 27 ℃, under a medium-level force output mode (pulse force is about 250N), after 2000 pulse waves are continuously output (about 5 minutes), the device needs to stop working to cool the device, the time for cooling to the initial temperature is usually not less than 10 minutes, and an operator and a patient can only wait during the period, so that the device cannot be independently applied to busy treatment occasions. In clinical use in certain secondary hospitals, it is found that each operator is usually equipped with 4 sets of the electromagnetic pulse vibration therapeutic apparatus for alternate use to meet the treatment requirement, which greatly increases the equipment budget of the hospital. In addition, because the shell of the product is made of plastic, the heat conducting performance is poor, and no temperature control assembly is arranged, when an operator forgets to rest to enable the product to continuously work (for example, the continuous work lasts for more than 20 minutes), the accidents of coil framework burnout and enameled wire insulating layer melting discharge explosion of the coil occur once because the coil and the iron core are overheated. The operator also finds that the output force is gradually reduced from the initially set force along with the lapse of the working time, for example, when the initially set force gear of the electromagnetic pulse vibration therapeutic apparatus product is a high gear (pulse force is about 400N), the force starts to be gradually reduced after the continuous working exceeds 2 minutes, and when the continuous working lasts for 5 minutes, the output force is less than 250N, that is, at least one gear is reduced, so that the consistency of the therapeutic effect cannot be ensured. The pulser in the aforementioned reference also belongs to an electromagnetic pulse wave generator, which is designed and manufactured by the american sensor Technology limited (sensor Technology, Inc.) and approved by the national drug administration for import (national institutes of health 20182261957), and unlike the aforementioned other electromagnetic pulse generators, the pulser can output pulse waves at a higher frequency (20-90Hz), and the temperature rise speed of the coil is still fast despite the addition of the aluminum heat dissipation fins outside the coil; in order to avoid burning, the short-term continuous use pulse frequency prompt is arranged in the software, the prompt is given in the software interface when the pulse is output for 2000 times in the short term, an operator is reminded to manually interrupt the pulse output, the coil is prevented from being burnt due to overheating, and in actual use, after about 3000 times of pulse output, the handle of the coil shell reaches nearly 60 ℃, and the coil shell cannot be continuously held for use. The same product of Pulstar can also refer to patent document CN105407855A, and the core structures of both are the same.

The electromagnetic pulse wave generators have the problems of large heat productivity and lack of effective heat dissipation, and the electromagnetic pulse wave generators need to be used temporarily after outputting pulses of about 2000-3000 times or after being continuously used for 5 minutes, and can be reused after dissipating heat for more than 10 minutes. According to the feedback of clinical users, each patient needs at least 10000 times of pulse or is continuously used for 8 minutes, and the electromagnetic pulse wave generator cannot meet the requirement, so that the further acceptance of the electromagnetic pulse wave generator by the market is limited; domestic imitations thereof, such as patent documents CN104013524A and CN107252388A, have the same problems because they completely inherit the design of the aforementioned products in terms of core structure; although CN108670782A also has a heat generation problem, it only has a fan at the rear end of the hand tool, and its air path is too long to effectively dissipate heat from the coil; and the domestic imitations can not reach the working frequency of CN105407855A or Pulstar, namely 20-90 Hz.

The research and development team of the inventor concentrates on the heat dissipation improvement of the electromagnetic pulse wave therapeutic apparatus for many years so as to prolong the single use time of the electromagnetic pulse wave therapeutic apparatus. Fig. 1 shows an electromagnetic pulse wave therapeutic apparatus hand tool with a heat radiation fan, which is designed by the inventor in advance, wherein a cylindrical shell is made of aluminum alloy, an aluminum alloy heat radiator is further installed outside the shell, and a pair of axial flow fans are arranged in the heat radiator. CN107362451A is an electromagnetic pulse vibration therapeutic apparatus and control method thereof proposed by the inventor in the past, which uses an adjustable high-power cold air source to generate low-temperature gas, and transmits the low-temperature gas to the heat dissipation fins at the coil part through a pipeline, so as to improve the heat dissipation power; when the heat dissipation power and the heating power are kept balanced, the temperature of the coil is not increased any more, and therefore the purpose of continuous and safe work is achieved. However, the device has the defect of high processing cost, and due to the special structural design of the air duct, the matched connector is required to be customized; in addition, the introduction of the high-power refrigerating plate and the cooling fins matched with the high-power refrigerating plate leads the volume of the whole machine to be incapable of being further reduced, and is not beneficial to portable design. Therefore, there is still a need for an electromagnetic pulse wave generator with a low temperature rise which can operate for a long time.

[ summary of the invention ]

It is an object of the present invention to overcome the above-mentioned deficiencies of the prior art and to provide an improved electromagnetic pulse wave therapy apparatus having an extended duration of single continuous use compared to the prior art.

In order to achieve the above object, the present invention provides an improved electromagnetic pulse wave therapeutic apparatus, comprising: the coil comprises a hollow bobbin and a lead wound on the hollow bobbin, the magnetic core is at least partially made of a permanent magnetic material, and the upper limit of the working temperature of the permanent magnetic material is not lower than 100 ℃; the front end of the magnetic core is fixed with a striking head, and the magnetic core can move along the axis in the hollow spool; the transmission rod is coaxially arranged with the magnetic core, and a first spring is coaxially arranged between the impact head and the transmission rod; the first retaining piece is arranged behind the magnetic core and provided with a groove coaxial with the magnetic core; in a rest state, the magnetic core is at least partially located in the recess of the first holder.

Preferably, the magnetic core is at least partially made of a neodymium iron boron permanent magnet material, and the upper limit of the working temperature of the neodymium iron boron permanent magnet material is not lower than 120 ℃.

Preferably, the magnetic coil further comprises a magnetic sleeve and a magnetic ring, the magnetic sleeve is arranged outside the coil, the magnetic ring is arranged at the front end of the coil, and the magnetic sleeve and the magnetic ring are made of soft magnetic materials, wherein the soft magnetic materials include, but are not limited to, 304 stainless steel, 316 stainless steel, 430 stainless steel, silicon steel, and 1J50 permalloy; and a heat transfer medium is filled between the magnetic conduction sleeve and the lead of the coil.

Preferably, said hollow spool and said first holder are at least partially made of a non-metallic material; the non-metallic materials include, but are not limited to, silicon nitride ceramics, zirconia ceramics, carbon fiber reinforced Polycarbonate (PC), carbon fiber reinforced nylon (PA), carbon fiber reinforced Polyetheretherketone (PEEK), carbon fiber reinforced Polytetrafluoroethylene (PTFE); among the above materials, carbon fiber reinforced PEEK has high wear resistance, temperature resistance, and impact resistance, and is less expensive to process than ceramic materials, and thus is more preferable.

Preferably, the transmission rod further comprises an anvil plate fixedly arranged at the rear end of the transmission rod, wherein the anvil plate is at least partially made of flexible materials; the flexible material has a hardness of more than 70 ℃ and a heat-resistant temperature of not less than 100 ℃, and is preferably selected from rubber, nitrile rubber, silica gel and polyurethane; in a static state, the shortest distance between the impact head and the chopping board is not more than 12 mm; and also preferably a cushion pad provided at the bottom of the recess of the first retaining member, the cushion pad being at least partially made of a flexible material.

Preferably, the magnetic conduction sleeve further comprises a second holding piece, the second holding piece is connected with the front end of the magnetic conduction sleeve, the transmission rod is held in the second holding piece and only allows the transmission rod to move along the axis, a limiting protrusion is arranged on the transmission rod, and a second spring is arranged between the limiting protrusion and the second holding piece.

Preferably, the temperature sensor further comprises a third holding member, the third holding member is connected with the rear end of the magnetic conductive sleeve, the first holding member is at least partially fixed by the third holding member, the third holding member further fixedly holds the temperature sensor and the optical coupler thereon, and the third holding member is made of an electrically conductive material, and the electrically conductive material is preferably an aluminum alloy.

More preferably, the magnetic conduction device further comprises a shell, the inner wall of the shell is in sliding fit with the outer wall of the magnetic conduction sleeve, and a heat dissipation groove is formed in the shell; the shell rear end is connected with the handle, the inside of handle is equipped with the opto-coupler separation blade, the handle with still be equipped with the third spring between the third keeper.

Preferably, the pulse power supply controller is electrically connected with the coil and outputs pulse current to the coil; the pulse power controller is also electrically connected with the temperature sensor and used for reading temperature data returned by the temperature sensor; the pulse power controller is also electrically connected with the optical coupler and reads the state information of the optical coupler.

More preferably, the wire diameter of the wire on the coil is 0.40-0.55mm, the number of turns of the coil is 400 and 700 turns, and the peak voltage output by the pulse power controller does not exceed 80V.

The inventors have noted that in existing products using electromagnetic pulse wave generators (including those mentioned in the background), a soft magnetic material is used as a magnetic core. This is probably because in these products, whether the high temperature environment inside the coil (usually close to 180 ℃) or the working condition of continuous impact vibration during the operation of the coil is very easy to cause the demagnetization or the fragmentation of the permanent magnetic material. Soft magnetic materials, such as soft iron or silicon steel, do not have this problem and are therefore used in existing electromagnetic pulse wave generators. However, soft magnetic materials do not usually exhibit magnetism in the absence of an external magnetic field, when a coil is energized, an electromagnetic field causes the soft magnetic core to be magnetized, and then an interaction force occurs with the soft magnetic core, in order to generate a strong enough acting force, the energized coil needs to have enough ampere turns, in the previous design scheme CN107362451A, the inventor adopts a wire with a wire diameter of 0.47mm to wind a coil with 580 turns, and adopts soft iron as a magnetic core material, and then a pulse voltage with a peak value of 176V needs to be energized, so that an instantaneous current as high as 30A can be generated to achieve a sufficient strength (in the prior art, for example, CN101437482A directly loads 220V alternating current on the coil after half-bridge rectification and filtration, and the instantaneous voltage exceeds 300V, and the current is larger). The inventor measures the average current of the coil of the product when the coil works, calculates the power of the coil to be about 200W, calculates the heating power of about 150W according to the weight and the heating speed of the coil, and deduces that more than 70% of the electric energy input into the coil is used for heating under the arrangement, so that the energy efficiency ratio not only wastes the electric energy, but also influences the working life of the coil, and restricts the time length of single continuous use.

Therefore, the inventor tries to modify the magnetic core from the aspect of improving the energy efficiency ratio, the soft iron magnetic core is replaced by the magnetic core made of the neodymium iron boron strong magnet with the same specification, and surprisingly discovers that under the same coil parameters, the pulse wave strength which is the same as that of the prior art can be achieved only by inputting the pulse voltage with the peak value of about 42V (the pulse width is slightly prolonged); this is probably because the permanent magnet itself has the magnetic field, no longer needs the magnetization of coil electromagnetic field, and after the coil lets in the electric current, the electric current directly takes place the effect with the magnetic field of permanent magnet. In order to avoid that the coil temperature rises too high and causes the permanent magnet to demagnetize, the permanent magnet material preferably has a high upper operating temperature limit, for example an upper operating temperature limit of not less than 100 ℃, more preferably not less than 120 ℃. In practical use, the inventor finds that the heat generation power is greatly reduced due to the improvement of the energy efficiency ratio, the heat generation speed is reduced, and the temperature of the permanent magnet magnetic core part is far lower than that of the original soft iron magnetic core. On the other hand, in order to avoid demagnetization caused by impact vibration and breakage of the permanent magnet, the inventor arranges an impact head made of a non-metal material at the front end of the permanent magnet to weaken the stress acting on the permanent magnet core at the moment of impact. The lower pulse voltage and less power consumption provide more options for the form of its power source, for example, a battery as a power source to form a portable instrument. In addition, even if a certain degaussing is caused by unavoidable high temperature and vibration working conditions, the permanent magnet can be continuously magnetized by the magnetization effect of the coil electromagnetic field. Generally, the material of the permanent magnet can be selected from an aluminum-nickel-cobalt permanent magnet alloy, an iron-chromium-cobalt permanent magnet alloy, a permanent magnetic ferrite, a rare earth permanent magnet material and a composite permanent magnet material, and based on different properties of the permanent magnet and a soft magnetic material, the permanent magnet can generate better energy efficiency ratio than that of a soft magnetic iron core; however, rare earth permanent magnet materials, such as neodymium iron boron, have higher magnetic field density, are more reactive with wire current, and have much higher resistivity than permanent magnet alloys, and are therefore preferred.

In the present invention, the center line of the coil is defined as an "axis", and the direction in which the pulse wave is output is defined as "front", whereas the direction is defined as "rear". The single continuous use duration in the invention refers to the time spent on the coil to rise from the normal temperature to the temperature limit value when the coil works under full load, and the shorter the time is, the larger the heating power of the coil is, the faster the temperature rise of the coil is; correspondingly, the number of continuous pulses refers to the total number of pulses output between the normal temperature and the temperature limit value; the temperature limit value is a temperature value corresponding to the situation that the pulse power supply controller judges that the pulse current is to be stopped outputting according to the value returned by the temperature sensor, the value is a safety limit value obtained by combining different temperature sensor positions through multiple tests, and when the temperature exceeds the limit value, the coil is in danger of being burnt; for example, in the present invention, a temperature sensor is provided on the third holder, which measures a temperature with hysteresis, and therefore the lower 50 ℃ is selected as the temperature limit. The hand tool is a device which is composed of a handle, a shell and all internal parts and is held by an operator for use, and when the hand tool further comprises a pulse power controller (such as a structure similar to CN 101437482A), the hand tool is basically identical to the electromagnetic pulse wave therapeutic apparatus. It should be emphasized that the electromagnetic pulse wave therapeutic apparatus of the present invention is a magnetic therapeutic apparatus that converts electromagnetic field into pulse mechanical wave to treat human body, and does not directly apply electromagnetic field to human body. The "upper working temperature limit" of the permanent magnet material refers to the upper temperature limit at which the permanent magnet material can maintain the inherent magnetic field density, and when the temperature of the permanent magnet exceeds the upper temperature limit, the magnetic field density of the permanent magnet material gradually decreases (i.e., the material deteriorates), and the permanent magnet material is converted into a paramagnetic material after continuously rising to the curie temperature; for example, the curie temperature of the neodymium iron boron permanent magnet material is about 320 ℃, but the upper limit of the working temperature is far lower than that of the neodymium iron boron permanent magnet material, so that the neodymium iron boron permanent magnet with the upper limit of the working temperature of 100 ℃, 120 ℃, 150 ℃ or even 180 ℃ can be obtained through the control of the raw material proportion and the manufacturing process in the prior art and can be used in the invention; a higher upper operating temperature limit means that it can operate more permanently without damage. The 'static state' in the invention means that the electromagnetic pulse wave therapeutic apparatus is not in a working state or a triggering state, and all parts are in respective initial positions under the action of the spring; for example, specifically, the optocoupler blade is located outside the optical center of the optocoupler, the magnetic core is located in the recess of the first holder and its bottom is in contact with the buffer pad, and the striking head has the furthest distance from the anvil.

In order to optimize the magnetic circuit, the inventor arranges a magnetic conduction sleeve and a magnetic conduction ring outside and at the front end of the coil, and the arrangement ensures that the magnetic circuit of the electromagnetic field at the front end of the coil is restrained in the magnetic conduction material as much as possible to reduce the magnetic resistance and avoid the leakage of the electromagnetic field, because the magnetic field does not act with the permanent magnet. Depending on the purpose of the arrangement, the magnetic conductive material should be a material with high magnetic permeability, low coercive force and high resistivity, such as 304 stainless steel, 316 stainless steel, 430 stainless steel, silicon steel and 1J50 permalloy. In addition to magnetic conduction, the magnetic conduction sleeve also has the heat conduction function of conducting the heat of the coil, so a heat transfer medium, such as heat conduction silica gel with the weight of at least 1W/(m.k), is arranged between the magnetic conduction sleeve and the coil lead.

The cross-sectional shape of the inner wall of the hollow bobbin is preferably circular in consideration of processing and manufacturing difficulty, so that the magnetic core matched with the hollow bobbin can be correspondingly arranged into a cylinder so as to facilitate axial movement in the hollow bobbin. Since the outer surface of the magnetic core rubs against the inner wall of the hollow bobbin during operation and the coil generates a high temperature, the material of the hollow bobbin should be selected to be wear-resistant, high temperature-resistant, impact-resistant, self-lubricating, such as silicon nitride ceramic, zirconia ceramic, carbon fiber reinforced Polycarbonate (PC), carbon fiber reinforced nylon (PA), carbon fiber reinforced Polyetheretherketone (PEEK), carbon fiber reinforced Polytetrafluoroethylene (PTFE), and carbon fiber reinforced PEEK has high wear resistance, high temperature resistance, and self-lubricity in plastic materials and is less expensive to process than ceramic, which is more preferable. The first holder is also preferably of the above-mentioned material for similar reasons.

The pulse wave generation of the invention adopts an impact structure (different from a direct pushing structure of the prior application CN 107362451A), the impact head is pushed by the magnetic core to move in an accelerated way, the impact head collides with the transmission rod and instantly transmits kinetic energy to the transmission rod, and pulse type explosive force as high as 400N is generated; the structure has stronger pulse force than a direct-pushing structure, but in practical tests, the impact sound of a rigid part is very large, and the user experience is poor, so that the inventor arranges a chopping block made of a flexible material at the rear end of the transmission rod to reduce the impact noise, wherein the flexible material can be exemplarily selected from rubber, nitrile rubber, silica gel and polyurethane; tests on flexible materials with different hardness show that the explosion force of collision is greatly weakened by the excessively low hardness, and the flexible material has the hardness of not less than 70 degrees in order to ensure the strength of the output pulse wave. When the core is reset, it collides with the first holder, and therefore, a cushion pad is preferably provided therebetween to further reduce noise. By such an arrangement, the noise of the instrument operation can be limited to below 50 db. In addition, unlike other products of similar construction, the distance between the impact head and the anvil in the rest condition of the invention does not exceed 12mm, which ensures that it can output higher frequencies, such as 90Hz pulse waves, as in the same US products; in case a higher frequency needs to be output, this distance may be further shortened, e.g. not more than 9mm, 8mm, 7mm, e.g. preferably not more than 5 mm.

The second retainer is arranged to limit the movement range of the transmission rod, so that the transmission rod can only move along the output shaft of the pulse wave and cannot move laterally, the limiting protrusion on the transmission rod ensures that the transmission rod cannot be separated from the retainer forwards, and the use safety is ensured, and the second spring enables the transmission rod to be in a position close to the impact head in a static state.

The third holder is used to secure the circuitry (including the coil) in the hand piece. For the convenience of wiring, the temperature sensor of the present invention is provided on a circuit board fixed to the third holder; in order to transmit the temperature of the coil to the temperature sensor in time, the third holding member is preferably a metal material with high thermal conductivity, and in order to avoid attraction with the magnetic core and weakening of pulse force, the third holding member should be a non-magnetic material, and such a material can be selected from aluminum alloy. Because the temperature sensor is arranged on the third holding piece instead of the outer side of the coil, the temperature sensing of the temperature sensor has certain hysteresis, but the arrangement reduces the wiring difficulty, on the other hand, the temperature sensor does not need to bear the high-temperature environment at the coil, the temperature of the coil can be reversely pushed through the sensed temperature rise curve, and the service life of the sensor is prolonged.

The setting of shell for the hand has more the sense of unity, and through its large tracts of land contact with the magnetic conduction sleeve pipe, can further derive the heat of coil in addition to evenly spread on the surface of shell, through the setting of radiating groove, then increased heat radiating area. The third spring is used for making the optical coupler separation blade be in under quiescent condition outside the optics center of opto-coupler to recoil when can cushion the vibration reduces its damage to the operator. The back end of the handle can be also provided with a flexible sleeve with an ergonomic appearance, so that the hand feeling of holding is optimized, and the recoil is dispersed. In order to further enhance the heat dissipation, a heat sink structure as shown in fig. 1 mentioned in the background art, or a heat dissipation scheme disclosed in CN107362451A can be incorporated into the electromagnetic pulse wave therapy apparatus of the present invention.

In the invention, the trigger signal of the hand tool work is generated by cutting off the optical path of the optical coupler by the optical coupler baffle sheet; this is not necessary, and any means capable of providing a trigger signal may be used, such as a travel switch, a key switch, etc.; optocouplers have a longer lifetime, a lower failure rate than mechanical switches and are therefore preferred.

The pulse power supply controller mainly has the following functions: 1. reading the current temperature, judging whether temperature drift compensation is needed or not, and stopping working or not; 2. reading the state of the optocoupler, and judging whether a trigger signal enters; 3. and outputting pulse current to the coil. The inventor has already described in CN107362451A in detail how to perform temperature drift compensation and how to stop the operation after reaching the temperature limit, and therefore, the detailed description is omitted here. The pulse power controller may be integrated with a hand tool, similar to that disclosed in CN 101437482A; or can be arranged separately from the hand tool, and the hand tool are connected through a cable. A communication module can be further arranged in the pulse power controller, and communication modes include but are not limited to WIFI, GPRS, Bluetooth, USB, 485 and 232; through the communication module, the pulse power controller can receive control instructions from a computer, a mobile phone or other remote hosts and feed back state information.

The inventor finds that when the wire diameter of the coil is 0.47mm and the number of turns is 580 turns, the electromagnetic pulse wave instrument structure can be driven by direct current pulse voltage (wave width is 3ms) of 42V, the direct current voltage can be obtained by filtering through a capacitor of more than 3000 muF after 220V alternating current is transformed through an isolation transformer of converting 220V into 30V, and the pulse modulation can be finished by controlling a high-power switching tube (such as MOS or IGBT) through a single chip microcomputer. The wire diameter and the number of turns of the coil are selected to be matched with the voltage of the pulse power supply. Generally, with the same coil volume, the thinner wire diameter can allow more turns to be wound, the coil resistance is correspondingly increased, and higher pulse voltage is required for driving; for example, a wire with 0.40mm can be wound on a bobbin with the same volume for 700 turns, and 80V voltage is required for driving; and the wire with the diameter of 0.55mm can only be wound for 400 circles, and can be driven at 28V.

In combination with the above description, it can be seen that the present invention achieves at least the following advantages:

1. through the selection of the magnetic core material and the matching of the magnetic core material and each structural component, the energy efficiency is improved from the source, the heating power of the coil is reduced, the single use time and the continuous output pulse frequency are prolonged, and the use strength of clinical treatment is better met;

2. the low-voltage driving is adopted, so that the possibility is provided for further miniaturization and portability transformation of the high-voltage LED lamp;

3. lower noise, greater impulse force, and more reliable protection for the operator;

[ description of the drawings ]

FIG. 1 is a schematic structural diagram of an electromagnetic pulse wave therapeutic apparatus with a cooling fan in the prior art;

FIG. 2 is a schematic diagram of the electromagnetic pulse wave therapeutic apparatus of the present invention;

FIG. 3 is a cross-sectional view of the electromagnetic pulse wave therapy apparatus of FIG. 2 at rest, taken along section A-A;

FIG. 4 is a cross-sectional view of the electromagnetic pulse wave therapy apparatus of FIG. 2 at section A-A in a first state;

FIG. 5 is a cross-sectional view of the electromagnetic pulse wave therapy apparatus of FIG. 2 at section A-A in a second state;

FIG. 6 is a graph showing the temperature rise of the electromagnetic pulse wave therapeutic apparatus of the present invention and a control group.

Description of the reference numerals: 1. the magnetic core, 2, the hollow bobbin, 3, the conducting wire, 4, the impact head, 5, the transmission rod, 6, the first spring, 7, the first retaining piece, 8, the magnetic conduction sleeve, 9, the magnetic conduction ring, 10, the chopping block, 11, the buffer pad, 12, the second retaining piece, 13, the second spring, 14, the third retaining piece, 15, the optical coupler, 16, the shell, 17, the handle, 18, the optical coupler blocking piece and 19, and the third spring.

[ detailed description ] embodiments

The invention is further described below with reference to the accompanying drawings and specific embodiments.

Example 1

Fig. 2 and 3 show a specific form of the electromagnetic pulse wave therapeutic apparatus of the present invention, which comprises: the coil comprises a magnetic core 1 and a coil, wherein the coil comprises a hollow bobbin 2 and a lead 3 wound on the hollow bobbin, an impact head 4, a transmission rod 5, a first spring 6, a first retaining piece 7, a magnetic conduction sleeve 8, a magnetic conduction ring 9, a chopping board 10, a cushion pad 11, a second retaining piece 12, a second spring 13, a third retaining piece 14, an optical coupler 15, a shell 16, a handle 17, an optical coupler blocking piece 18 and a third spring 19.

The hollow spool 2 is made of carbon fiber reinforced PEEK, the lead is a C + grade high-temperature-resistant enameled wire with the wire diameter of 0.47mm and is wound by 580 turns, the magnetic core 1 is made of a neodymium iron boron permanent magnet material, and the upper limit of the working temperature of the permanent magnet material is not lower than 120 ℃; the front end of the magnetic core 1 is fixed with a striking head 4 made of carbon fiber reinforced PA, and the magnetic core 1 can move along the axis in the hollow bobbin 2; the transmission rod 5 and the magnetic core 1 are coaxially arranged, and a first spring 6 is coaxially arranged between the impact head 4 and the transmission rod 5; a first holder 7 made of carbon fiber reinforced PA is disposed behind the magnetic core 1, the first holder 7 being provided with a groove coaxial with the magnetic core 1; in the rest state (i.e. the state shown in fig. 3), the magnetic core 1 is at least partially located in the recess of the first holder 7.

The magnetic conduction sleeve 8 is arranged outside the coil, the magnetic conduction ring 9 is arranged at the front end of the coil, the magnetic conduction sleeve 8 is made of 1J50 permalloy and 304 stainless steel, and the magnetic conduction ring 9 is made of 304 stainless steel or 1J50 permalloy; and heat-conducting silica gel with the heat conductivity coefficient of 1.6W/(m.K) is filled between the magnetic-conducting sleeve 8 and the lead 3 of the coil.

The chopping board 10 is fixedly arranged at the rear end of the transmission rod 5, and the chopping board 10 is made of nitrile rubber with the hardness of more than 70 ℃ and the temperature resistance of 100 ℃; the buffer pad 11 is disposed at the bottom of the groove of the first holder 7, and the buffer pad 11 is made of silicone rubber with a hardness of 60 ℃ and a temperature resistance of 200 ℃.

The second holder 12 is connected to the front end of the magnetically conductive sleeve 8, and the transmission rod 5 is held in the second holder 12 and is allowed to move only along the axis. And a limiting protrusion is arranged on the transmission rod, and a second spring 13 is arranged between the limiting protrusion and the second retaining piece 12. More specifically, as shown in fig. 3, a longitudinal groove is formed in the second holder 12, and a bead hole is formed in the convex side surface of the limit position of the transmission rod 5, and a silicon nitride ceramic bead is arranged in the bead hole and is embedded between the bead hole and the groove, so that the transmission rod 5 can only move longitudinally along the second holder 12, but cannot move in translation or rotation.

The third holder 14 is connected to the rear end of the magnetic conductive sleeve 8, the first holder 7 is fixed by the third holder 14, the third holder 14 fixedly holds a temperature sensor and an optical coupler 15, and the third holder 14 is made of an aluminum alloy.

The inner wall of the shell 16 is in sliding fit with the outer wall of the magnetic conduction sleeve 8, and a heat dissipation groove is formed in the shell 16; the rear end of the housing 16 is connected with a handle 17, the light coupling blocking piece 18 is arranged inside the handle 17, and the third spring 19 is arranged between the handle 17 and the third holder 14.

The electromagnetic pulse wave therapeutic apparatus also comprises a pulse power supply controller (not shown in the figure), wherein the pulse power supply controller is electrically connected with the coil and outputs pulse current to the coil (peak voltage 42V, wave width 0.3-1ms, and frequency 2-90 Hz); the pulse power controller is also electrically connected with the temperature sensor and used for reading temperature data returned by the temperature sensor; the pulse power controller is also electrically connected with the optical coupler and reads the state information of the optical coupler.

Example 2

Fig. 3-5 show different states of the electromagnetic pulse wave therapeutic apparatus according to the present invention.

Fig. 3 shows a rest state in which the optocoupler blade 18 is located outside the optical centre of the optocoupler 15, the core 1 is located in the recess of the first holder 7 and its bottom is in contact with the bumper pad 11, and the striking head 4 is at the furthest distance from the anvil 10.

Fig. 4 shows a first state, in which the core 1 is in the recess of the first holder 7 and its bottom is in contact with the cushion 11, the striking head 4 being kept at the furthest distance from the anvil 10 by the action of the first spring 6; an operator holds the handle 17 to press downwards, the optical coupler blocking piece 18 enters the optical center of the optical coupler 15, the optical path of the optical coupler 15 is cut off, the state of the optical coupler 15 is changed, and the optical coupler 15 returns a trigger signal to the pulse power supply controller.

Fig. 5 shows a second state, in this state, the optical coupler blocking piece 18 continuously blocks the optical path of the optical coupler 15, the pulse power controller receives a trigger signal returned by the optical coupler 15 and outputs a pulse current to the coil, an acting force occurs between the coil current and the magnetic field of the magnetic core 1, so that the magnetic core 1 pushes the impact head 4 to move forward to compress the first spring 6 and further impact the chopping board 10 to generate an explosive pulse wave, and the pulse wave is led out to an affected part through the transmission rod 5. It will be appreciated that at the moment of impact the transmission rod 5 will move forward in its axial direction for a short displacement, after which it will return under the combined action of the external pressure and the second spring, which is very short and therefore not explained as a state alone.

Because the duration of the current output by the pulse power supply is extremely short, when the magnetic core 1 impacts the chopping board 10, the magnetic core is no longer under the action of the electromagnetic field of the coil, so that the magnetic core 1 is reset under the action of the rebounding force of the chopping board and the elasticity of the first spring 6, namely, the magnetic core returns to the first state. When the optical coupling blocking piece 18 continuously blocks the optical path of the optical coupling 15, the pulse power supply continuously outputs pulse current to the coil, the electromagnetic pulse wave therapeutic apparatus is switched between the first state and the second state at a constant frequency (for example, 45Hz), and the transmission rod 5 continuously outputs pulse waves with corresponding frequencies.

When an operator lifts the handle 17, the optical coupler blocking piece 18 is separated from the optical center of the optical coupler 15, the trigger signal is terminated, and the electromagnetic pulse wave therapeutic apparatus returns to a static state.

When the temperature value returned by the temperature sensor is higher than the limit value (for example, 50 ℃), even if the operator presses the handle 17, the pulse power controller can not output pulse current, and at the moment, the electromagnetic pulse wave therapeutic apparatus is kept in the first state and does not enter the second state, so that the function of protecting the coil from being damaged by overheating is achieved.

Example 3

In order to compare the temperature rise rates of the electromagnetic pulse wave therapeutic apparatus described in the present invention with those of the prior product structures, three combinations were set up to determine respective temperature rise curves. Wherein the first combination adopts a soft ferromagnetic core and a natural heat dissipation structure of an aluminum alloy shell which is the same as the soft ferromagnetic core; the second combination also adopts a soft iron core and adopts a heat dissipation structure of a heat dissipation fin and an axial flow fan as shown in fig. 1, wherein the specification of the axial flow fan is 4010/12V/0.15A; the third combination is the electromagnetic pulse wave therapeutic apparatus structure of the invention, namely the permanent magnet magnetic core and the aluminum alloy shell are adopted for natural heat dissipation. The remaining parameters (coil wire diameter, number of turns, etc.) of the three combinations are identical except for the conditions specifically described above.

The first set of test conditions was: the method comprises the steps of continuously working at a temperature limit value of 40 ℃ under the conditions of 45Hz pulse current, current width of 1.5ms and peak voltage of 176V, naturally cooling, and recording the value of a temperature sensor every 30 s.

The second set of test conditions was: the pulse current with the frequency of 45Hz, the current width of 1.5ms and the peak voltage of 176V are continuously worked to the temperature limit value of 50 ℃, the pulse current and the peak voltage are cooled by the self-contained axial flow fan during and after the work is stopped, and the numerical value of the temperature sensor is recorded every 30 s.

The third set of test conditions was: the method comprises the steps of continuously working at a temperature limit value of 50 ℃ under the conditions of 45Hz pulse current, current width of 3ms and peak voltage of 42V, naturally cooling, and recording the value of a temperature sensor every 30 s.

It should be noted about the test conditions that, for the first group and the second group using soft iron as the magnetic core, if the same peak voltage (i.e., 42V) as that of the third group is used, the pulse wave cannot be output at all because the electromagnetic attractive force is weak. Furthermore, the inventor has found that for the combination of the magnetic cores of different materials and different driving voltages, the linear relationship between the current width and the output force is different, and the output force in the above three sets of test conditions is approximately the same through measurement and adjustment, that is, for the combination of the pulse voltage of 42V and the permanent magnet core, the force output by the current width of 3ms is the same as the force output by the combination of 176V and the soft iron core at the current width of 1.5 ms. That is, the premise of the comparison among the three is as follows: the same frequency and output force.

In addition, the temperature sensor is arranged at a certain distance from the coil, the heat transfer has time lag, the temperature rise of the first group of test conditions is too fast, and the temperature limit value is set to be 40 ℃ in order to avoid the danger caused by burning the coil; three sets of temperature measurement all adopt DS18B20 digital temperature sensors.

Figure 6 shows the temperature rise curves for the three combinations. As can be seen from fig. 6, the first group reaches the limit value of 40 ℃ in about 3 minutes, and although the input of the pulse current is stopped at 40 ℃, the temperature of the first group continuously rises to about 50 ℃ and slowly falls under the natural heat dissipation condition, because the temperature of the coil rises too fast, the temperature value obtained by the temperature sensor has a large difference from the actual temperature of the coil, the temperature of the coil is far higher than 50 ℃ when the first group stops working, that is, the coil accumulates much heat, and continuously transfers the heat to the temperature sensor after the first group stops working, so that the temperature read after the first group stops working continuously rises.

The second group adopts an effective heat dissipation means, the temperature rise curve of the second group is gentler than that of the first group, the temperature limit value is reached in about 7 minutes, and the second group can be cooled more rapidly after stopping working, and the second group is represented by a more inclined temperature reduction curve. The second group and the first group adopt the same magnetic core and pulse voltage parameters, so that the heating power of the coils is the same; but the second group has a greater heat dissipation power resulting in a difference in the curves.

The third group, namely the electromagnetic pulse wave therapeutic apparatus of the present invention, has a temperature rise curve which is more gradual than that of the second group, and the temperature rise curve does not reach the temperature limit value until 13 th minute, and the slope of the curve changes more rapidly before and after the operation is stopped, i.e. the curve shows a sharp peak, and the reason is presumed to be that the coil is slow in temperature rise and does not have excessive heat accumulation and storage amount, so that the temperature sensor loses heat inflow quickly after the operation is stopped, and the temperature starts to decrease.

Tests show that the electromagnetic pulse wave therapeutic apparatus can meet the requirement of a practitioner on continuous treatment of one patient without an additional radiator, and can be used for treating the next patient only by short rest. For the case of a large number of patients and frequent use, it is contemplated to add the heat dissipation structure shown in fig. 1 to the housing of the apparatus of the present invention to further extend the single continuous use time. The electromagnetic pulse wave therapeutic apparatus solves the problem of over-quick heating in the electromagnetic pulse wave therapeutic apparatus through the original combination of the structure and the material; such solutions are not suggested by the prior art and their effectiveness is unexpected to those skilled in the art.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, combinations, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. An electromagnetic pulse wave therapeutic apparatus, comprising: a magnetic core (1) and a coil, the coil comprising a hollow bobbin (2) and a wire (3) wound thereon; the front end of the magnetic core (1) is fixed with a striking head (4), and the magnetic core (1) can move along the axis in the hollow spool (2); the transmission rod (5) is coaxially arranged with the magnetic core (1), and a first spring (6) is coaxially arranged between the impact head (4) and the transmission rod (5); a first holder (7) arranged behind the magnetic core (1), the first holder (7) being provided with a groove coaxial with the magnetic core (1); in the rest state, the magnetic core (1) is at least partially located in the recess of the first holder (7); the method is characterized in that: the magnetic core (1) is at least partially made of a permanent magnetic material, and the upper limit of the working temperature of the permanent magnetic material is not lower than 100 ℃; the hollow spool (2) and the first holder (7) are made of a non-metallic material; the transmission rod (5) is fixedly arranged at the rear end of the transmission rod (10), and the transmission rod is characterized by further comprising an anvil plate (10), wherein the anvil plate (10) is fixedly arranged at the rear end of the transmission rod (5), and at least part of the anvil plate (10) is made of flexible materials; when the chopping board is in work, the magnetic core (1) pushes the impact head (4) to move forwards to compress the first spring (6) so as to impact the chopping board (10) to generate explosive pulse waves, and the pulse waves are led out through the transmission rod (5); the pulse power supply controller is electrically connected with the coil and controllably loads direct-current pulse voltage to the coil; the wire diameter of the lead (3) is 0.40-0.55mm, the number of turns of the coil is 400-700 turns, and the peak voltage loaded on the coil by the pulse power supply controller does not exceed 80V.

2. The electromagnetic pulse wave therapeutic apparatus according to claim 1, wherein: the magnetic core (1) is at least partially made of a neodymium iron boron permanent magnet material, and the upper limit of the working temperature of the neodymium iron boron permanent magnet material is not lower than 120 ℃.

3. The electromagnetic pulse wave therapeutic apparatus according to claim 1, wherein: the coil is characterized by further comprising a magnetic conduction sleeve (8) and a magnetic conduction ring (9), wherein the magnetic conduction sleeve (8) is arranged outside the coil, the magnetic conduction ring (9) is arranged at the front end of the coil, the magnetic conduction sleeve (8) and the magnetic conduction ring (9) are made of soft magnetic materials, and the soft magnetic materials are selected from 304 stainless steel, 316 stainless steel, 430 stainless steel, silicon steel and 1J50 permalloy; and a heat transfer medium is filled between the magnetic conduction sleeve (8) and the lead (3) of the coil.

4. The electromagnetic pulse wave therapeutic apparatus according to claim 1, wherein: the non-metallic material used to make the hollow bobbin (2) and the first holder (7) is selected from one of silicon nitride ceramic, zirconia ceramic, carbon fiber reinforced polycarbonate, carbon fiber reinforced nylon, carbon fiber reinforced polyetheretherketone, carbon fiber reinforced polytetrafluoroethylene or a combination thereof.

5. The electromagnetic pulse wave therapeutic apparatus according to claim 1, wherein: in a static state, the shortest distance between the impact head (4) and the chopping board (10) is not more than 12 mm; the flexible material used to make the anvil has a hardness of not less than 70 degrees and a heat resistance temperature of not less than 100 ℃.

6. The electromagnetic pulse wave therapeutic apparatus according to claim 1, wherein: further comprising a cushioning pad (11), said cushioning pad (11) being arranged at the bottom of said recess of said first holding member (7), said cushioning pad (11) being at least partly made of a flexible material.

7. The electromagnetic pulse wave therapeutic apparatus according to claim 3, wherein: the magnetic conduction sleeve is characterized by further comprising a second holding piece (12), the second holding piece (12) is connected with the front end of the magnetic conduction sleeve (8), the transmission rod (5) is held in the second holding piece (12) and only allows the transmission rod to move along the axis, a limiting protrusion is arranged on the transmission rod, and a second spring (13) is arranged between the limiting protrusion and the second holding piece (12).

8. The electromagnetic pulse wave therapeutic apparatus according to claim 3, wherein: the magnetic conductive sleeve is characterized by further comprising a third retaining piece (14), the third retaining piece (14) is connected with the rear end of the magnetic conductive sleeve (8), the first retaining piece (7) is at least partially fixed by the third retaining piece (14), a temperature sensor and an optical coupler (15) are further fixedly arranged on the third retaining piece (14), and the third retaining piece (14) is at least partially made of aluminum alloy.

9. The electromagnetic pulse wave therapeutic apparatus according to claim 8, wherein: the magnetic conduction sleeve is characterized by further comprising a shell (16), the inner wall of the shell (16) is in sliding fit with the outer wall of the magnetic conduction sleeve (8), and a heat dissipation groove is formed in the shell (16); the rear end of the shell (16) is connected with a handle (17), an optical coupling blocking piece (18) is arranged inside the handle (17), and a third spring (19) is further arranged between the handle (17) and the third retaining piece (14).

10. The electromagnetic pulse wave therapeutic apparatus according to claim 8, wherein: the pulse power controller is also electrically connected with the temperature sensor and used for reading temperature data returned by the temperature sensor; the pulse power controller is also electrically connected with the optical coupler and reads the state information of the optical coupler.

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