CN104399187B - A kind of method demarcating the effective laser power of low power laser therapeutic instrument - Google Patents
A kind of method demarcating the effective laser power of low power laser therapeutic instrument Download PDFInfo
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- CN104399187B CN104399187B CN201410737823.2A CN201410737823A CN104399187B CN 104399187 B CN104399187 B CN 104399187B CN 201410737823 A CN201410737823 A CN 201410737823A CN 104399187 B CN104399187 B CN 104399187B
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Abstract
The present invention relates to a kind of method and apparatus demarcating the effective laser power of low power laser therapeutic instrument, described device is provided with detecting head, data acquisition unit and computer；Detecting head includes photodiode and pre-amplifying module, and data acquisition unit includes data collecting card and power supply；Data collecting card connects the pre-amplifying module of detecting head, is converted to digital signal by photodiode collection and via the analogue signal of pre-amplifying module output, and transfers data to computer to complete data processing；Power supply connects pre-amplifying module, is responsible for pre-amplifying module and powers.During use, detector is arranged on laser therapeutic apparatus front end, ensure that photodiode is arranged in laser head surrounding volume and can be accepted the rear laser-bounce into nearly 180 degree of laser head beam direction and the scattered light of laser therapeutic apparatus, carry out the mensure of effective laser power.First passage of the present invention monitors laser retroreflection and scattered signal obtains entering accurately effective laser power of body surface.
Description
【Technical field】
The present invention relates to medical laser instrument technical field, specifically, it is related to a kind of demarcation low power laser therapeutic instrument
The method and apparatus of effective laser power.
【Background technology】
Laser can produce biologic effect, promotes cell regeneration, improve blood circulation, anti-inflammatory analgetic, mitigate edema,
Adjust body's immunity.The shorter laser of wavelength (as 650nm) has good curative effect to superficial tissue pathological changes, infrared band
Laser (as 810nm) has very big penetration capacity to skin, fat and the tissue such as muscular tissue and osseous tissue, therefore to deep
Lesion tissue has good curative effect.The population effect of different optical maser wavelength combinations can realize the therapeutical effect to different depth.
Therefore low power laser treatment has obtained increasing application, such as in bone pain, myalgia, soft tissue pain, nerve
Bitterly, it is used widely in the naturopathy of the orthopaedics such as the edge of a knife and wound pain, the traumatology department and Pain Management disease.
But medical circle has ratio to some diseases, the curative effect of the low power laser treatment of such as carpal tunnel syndrome (abbreviation CTS)
Larger dispute, DB Piazzini in 2007 et al. all delivering between in January, 1985 in May, 2006 (provides with regard to CTS
Clinical symptoms and electro physiology test and appraisal are made a definite diagnosis) document (based on MEDLINE data base) of expectant treatment done systematic commentary,
It is highly inconsistent for particularly pointing out to laser therapy effect understanding.In laser radiation, the parameter of laser, particularly arrives
Time interval between the laser power reaching affected part, the area irradiating affected part, laser action time and the irradiation of each laser etc. is all
Closely related to the effect of tissue with laser, therefore want the effect of accurate evaluation laser therapy it is necessary to accurate control reaches
The laser parameter of affected part body surface, even up to therapy target, this point is to ignore in most clinical trials.Boston in 2006
Commentary paper to seven laser therapy CTS research that University Medical College neuroscience system M.Naesera delivers [M.Naesera,
Photobiomodulation of Pain in Carpal Tunnel Syndrome:Review of Seven Laser
Therapy Studies, Photomedicine and Laser Surgery, 24,101-110 (2006) .] analysis finds：?
Laser radiation dose (9J, 12-30J, the 32J/cm adopting in laser therapy CTS curative effect certainly five cases of conclusion2,
225J/cm2) apparently higher than in two cases obtaining laser therapy CTS curative effect negative decision laser radiation dose (1.8J or
6J/cm2).But in the report of this five affirmative laser curative effects, laser parameter diversity is also very big, and optical maser wavelength has significance difference
Not, 830nm, the Single wavelength of 632.8nm, 904nm, 670nm or combined wave length is had to irradiate, laser energy density there is also substantially poor
Different, not to mention the difference of laser action time and time interval.Laser power and laser energy density height ensure that sharp
The curative effect of light treatment CTS？Answer is negative.Bergen university of Norway J.Bjordal in 2007 [J.Bjordal,
Inadequate statistical analysis hides significant effect of low level laser
therapy in carpel tunnel syndrome,Photomedicine and Laser Surgery,25,530-531
(2007) .] report the unfavorable factor that too high laser energy in laser therapy CTS and energy density may be brought.So,
What the optimal parameter of CTS laser therapy is？There is the threshold value of laser power, laser energy density and total irradiation laser energy
?？The laser parameter reaching therapy target was also never monitored in past clinical experimental study.
In the prior art, (upper Heyman's enlightening is gloomy for for example more widely used Man Disen Pain Therapy by Laser Diode instrument
Photoelectric Co., Ltd.), the only nominal value of laser therapeutic head output, all do not comprise the laser irradiating part to treated object
The laser-bounce of position and the measurement apparatus of scattering.The nominal output parameter of the laser therapeutic apparatus of such as model MDC-500-I is such as
Under：Output 0-500mW continuously adjustabe, laser spot diameter 50mm.But laser beam is irradiated to can be sent out during human body skin
Raw significantly reflection and scattering, lead to effective laser power to be decreased obviously.
Understand in sum, accurately measurement and the parameter of control laser are very necessary, but this point is majority faces
Ignore in bed test, and because human body skin has very big individual variation to the reflection of laser and scattering ratio, therefore low
It is highly desirable to treating the demarcation all carrying out effective laser power each time in power laser therapeutic process.Therefore need foundation badly
Laser parameter actual measurement means, reach the effective laser parameter of affected part body surface in quantitative measurement treatment, be that low power laser treatment determines
Suitable laser parameter scope, and develop the laser parameter monitoring auxiliary equipment in clinical low power laser treatment.
【Content of the invention】
The purpose of the present invention is for deficiency of the prior art, provides a kind of laser therapeutic apparatus reflected light and scattered light to visit
Survey device.
Another purpose of the present invention is to provide a kind of method demarcating the effective laser power of low power laser therapeutic instrument.
Another purpose of the present invention is to provide described laser therapeutic apparatus reflected light and the purposes of detector for scattered light.
For achieving the above object, the present invention adopts the technical scheme that：
A kind of laser therapeutic apparatus reflected light and detector for scattered light, it is provided with detecting head, data acquisition unit and computer；Institute
The detecting head stated is provided with photodiode and pre-amplifying module；Described data acquisition unit includes data collecting card and power supply；
Described data collecting card connects pre-amplifying module, the simulation exporting by photodiode collection and via pre-amplifying module
Signal is converted to digital signal, and transfers data to computer, completes data processing in a computer；Described power supply connects
Pre-amplifying module, is responsible for pre-amplifying module and powers.
The number of described photodiode is 20.
Under use state, described photodiode is arranged in the laser head surrounding volume of laser therapeutic apparatus, for accepting to swash
Laser-bounce in the near backward 180 degree of the laser head beam direction of photo-therapeutic instrument and scattered power signal.
Described photodiode is uniformly distributed in sector, and the incident laser radiation window of laser head is equivalent to two photoelectricity
The vacancy of diode, the angle of the photodiode of nearly coplanar laser illumination of incident laser radiation window side is 5 °, incident sharp
The angle of the photodiode of nearly coplanar laser illumination of light irradiation window opposite side is 170 °.
For realizing above-mentioned second purpose, the present invention adopts the technical scheme that：
A kind of method demarcating the effective laser power of low power laser therapeutic instrument, comprises the following steps：
A) as above arbitrary described laser therapeutic apparatus reflected light and detector for scattered light are arranged on laser therapeutic apparatus front end,
Ensure that photodiode is arranged and can be accepted the laser head light of laser therapeutic apparatus in the laser head surrounding volume of laser therapeutic apparatus
Laser in the near backward 180 degree of Shu Fangxiang；
B) all of photodiode is calibrated to identical amplification via the output of pre-amplifying module；
C) coefficient between calibration photodiode exports via pre-amplifying module analogue signal and laser power；
D) start low power laser therapeutic instrument, low power laser is obtained by detecting head, data acquisition unit and computer and controls
Treat effective laser power of instrument.
The concrete grammar of step b) is：Each photodiode be correspond to same light source, record each photoelectricity two
Pole pipe, via the output signal of pre-amplifying module, then calculates corresponding amplification and is corrected.
The concrete grammar of step c) is：By on the laser light incident of laser therapeutic apparatus to one block of clouded glass, and after clouded glass
An energy meter record transmitted optical power is placed in face, the photodiode of reflectance to be corrected is placed on the position of energy meter,
Transmitted optical power calibration photodiode using record.
For realizing above-mentioned 3rd purpose, the present invention adopts the technical scheme that：
As above arbitrary described laser therapeutic apparatus reflected light and detector for scattered light have in demarcation low power laser therapeutic instrument
Application in effect laser power.
The invention has the advantages that：
The present invention has following innovative point：The present invention establishes laser parameter actual measurement means, have developed laser therapeutic apparatus anti-
Penetrate light and detector for scattered light, first passage monitors laser backscatter and reflected signal obtains entering the accurately effective of body surface
Laser power.It is right in being treated that method proposed by the present invention can be widely applied to practical function in low power laser therapeutic process
The quantitative measurement of effective laser power of elephant, makes great sense to the curative effect comparing and judging low power laser treatment, is expected to
Clarify the dispute that long-standing low power laser treats curative effect, and the suitable laser parameter of determination can be treated for low-power,
It is expected to develop into the clinical auxiliary equipment of practical low power laser therapeutic instrument, implement individual character for being directed to individual variation future
Changing medical treatment selects suitable parameters to provide important means.
【Brief description】
Accompanying drawing 1 is the structural representation of laser therapeutic apparatus reflected light of the present invention and detector for scattered light.
Accompanying drawing 2 is the ultimate principle figure of laser therapeutic apparatus reflected light of the present invention and detector for scattered light.
Accompanying drawing 3 is the use state schematic diagram of laser therapeutic apparatus reflected light of the present invention and detector for scattered light.
Accompanying drawing 4 and Fig. 5 are the coefficient calibration schematic diagrams between the analogue signal of photodiode and laser power.
Accompanying drawing 6 is laser reflectivity (or reflection coefficient) result to 30 CTS patient's wrist actual measurements.
【Specific embodiment】
The specific embodiment below in conjunction with the accompanying drawings present invention being provided elaborates.
The reference being related in accompanying drawing and ingredient are as follows：
1. detecting head 11. photodiode
12. pre-amplifying module 2. data acquisition unit
21. data collecting card 22. power supply
3. computer 4. laser head
5. clouded glass 6. energy meter
The laser therapeutic apparatus reflected light of embodiment 1 present invention and detector for scattered light
Refer to Fig. 1, Fig. 1 is the structural representation of laser therapeutic apparatus reflected light of the present invention and detector for scattered light.Described
Laser therapeutic apparatus reflected light and detector for scattered light be provided with detecting head 1, data acquisition unit 2 and computer 3.Described detecting head
1 comprises 20 photodiodes 11 and pre-amplifying module 12, and described photodiode 11 is with pre-amplifying module 12 even
Connect, the output current signal of photodiode 11 is converted to 0-10V voltage signal by described pre-amplifying module 12.Described
Data acquisition unit 2 includes data collecting card 21 and power supply 22.Described data collecting card 21 connects pre-amplifying module 12, will be front
The analogue signal putting amplification module 12 output is converted to digital signal, and transfers data to computer 3, complete in computer 3
Become data processing.Described power supply 22 connects pre-amplifying module 12, is responsible for pre-amplifying module 12 and powers.Described calculating
Machine 3 is provided with signal acquiring system, control system, Data Analysis Services system.
It should be noted that it is in the laser head surrounding volume row of laser therapeutic apparatus when described photodiode 11 uses
Cloth, for accepting the laser head beam direction of the laser therapeutic apparatus laser power signal backward in nearly 180 degree；Described data is adopted
Truck 21 can be usb data capture card, such as NI USB-6210, for receiving each photodiode 11 via preposition amplification mould
The signal of block 12 output is simultaneously transferred to computer 3；Described computer 3 is used for calculating all reflections and scattering laser power is total
Value；The current signal that described pre-amplifying module 12 is used for exporting photodiode 11 is converted to 0-10V voltage signal, just
Obtain in subsequent acquisition.Described signal acquiring system, control system, Data Analysis Services system are used for gathering, store and dividing
The various information (including the reflectance of different angles) of analysis patient, at the convenient subsequently information tracing to patient and historical data
Reason, these systems are known to those skilled in the art.
The method that embodiment 2 present invention demarcates the effective laser power of low power laser therapeutic instrument
Refer to Fig. 2, Fig. 2 is the ultimate principle figure of laser therapeutic apparatus reflected light of the present invention and detector for scattered light.This
The ultimate principle of bright method is：Because the laser beam irradiation of laser head transmitting can be in space ± 90 ° to after scattering surface (skin)
Interior scatter, 16 photodiodes 11 (in addition 4 is that test is used) are distributed on one in the section of scattering surface,
The laser-bounce performance number of each photodiode 11 collection, as the mean power of its place annulus, is then passed through filtering, is intended
The laser-bounce power that operation obtains in whole space such as close and weight, the reflectance to laser for the different skin is judged with this.
(power that 4 photodiodes of wherein lowermost end detect is extremely low can as shown in Fig. 2 20 photodiodes 11
With without) be uniformly distributed in sector at grade, the angle of two neighboring photodiode 11 is 7.86 °, due to pushing up most
End needs to leave illumination window for incident laser, and therefore top has two photodiode vacancies, first, right side photoelectricity two
The angle of pole pipe is 5 ° (with respect to anticlockwise angle of coplanar laser illumination), the angle of first photodiode in left side
For 170 ° (with respect to anticlockwise angles of coplanar laser illumination), then total angle is configured to 21 × 7.86 ° of+5 ° of+10 ° of ≈
180 °, substantially can cover whole hemisphere.
The calculation procedure of laser reflectivity is as follows：
1. filter：For filtering the electronic noise of detecting head 1 data harvester 2, filtering method has many, according to this is
The measuring characteristic (acquisition rate is slower) of system determines to adopt frequency domain filtering method, filters high-frequency noise.
2. calibrate：Because the parameters such as the enlargement ratio of each photodiode 11, light sensitivitys have differences it is therefore desirable to first
Each photodiode 11 is calibrated to identical amplification via the output of pre-amplifying module 12 it is assumed that each photoelectricity two
Pole pipe 11 is V via the voltage signal that pre-amplifying module 12 exportsi, calibration factor is ei, then the numerical value after calibrating is eiVi.
3. matching：Because the restriction in space, top has two photodiode vacancies, and uneven because of reflected light
Property may lead to the detectable signal of certain photodiode especially high or especially low it is therefore desirable to carry out curve plan to return signal
Close, obtain the value of each photodiode (including the photodiode of 2 vacancies).Approximating method can using fitting of a polynomial,
Spline curve fitting, and least square fitting etc., the simple curve of the system can be competent at, this programme adopts multinomial to intend
Close.Data after matching is：M is polynomial order, and a is the multinomial coefficient of matching.
4. weighted integral：Each data measured by photodiode 11 represents the meansigma methodss of 7.68 ° of spherical zones at its place,
And the area difference of each spherical zone is it is therefore desirable to the data that each photodiode 11 is detected is weighted integrating.Spherical zone
Areal calculation formula is：
Wherein, R is the radius of photodiode place sphere, the angle (θ=5 °+i* δ) that θ arranges for photodiode, δ
For the angle of spherical zone, δ=7.86 ° in the system.As can be seen from the above equation, the area of spherical zone is only relevant with | cos θ |, therefore plus
Data after power can be expressed as：
5. power conversion：Treated data before is converted to final power signal.Due to before to every
The signal of individual photodiode is calibrated and has been weighted, as long as being therefore multiplied by the coefficient of a fixation to data before and asking
With can be obtained by power signal.Therefore final reflected optical power can be expressed as：
Wherein c is to be between the analogue signal and laser power that photodiode 11 exports via pre-amplifying module 12
Number, n is the quantity (n=22) of detector.The bearing calibration of c is given by next section.
Refer to Fig. 3, Fig. 3 is the use state schematic diagram of laser therapeutic apparatus reflected light of the present invention and detector for scattered light.
During use, the laser therapeutic apparatus reflected light of the present invention and detector for scattered light are directly installed on existing laser therapeutic apparatus front end, no
Laser therapeutic apparatus need to be transformed, and be only connected with common computer by USB line, there is the suitability and the strong spy of portability
Point.Demarcate the effective laser power of low power laser therapeutic instrument concrete grammar be：
(1) all of photodiode 11 is calibrated to identical amplification via the output of pre-amplifying module 12
All of photodiode 11 is calibrated to identical amplification via the output of pre-amplifying module 12, needs
The light source of one stable and uniform, and the sun as nature energy supplier have the incomparable stability of artificial light sources,
Uniformity, therefore can select, a sunny daytime, all photodiodes 11 to be placed in one plane, and is aligned
The sun, is now equivalent to each photodiode 11 and correspond to same light source, records each photodiode 11 via front
Put the output signal of amplification module 12, then can calculate corresponding amplification and be corrected.
(2) between calibration photodiode 11 exports via pre-amplifying module 12 analogue signal and laser power it is
Number
Referring to Fig. 4 and Fig. 5, by the laser light incident of laser therapeutic apparatus to one block of clouded glass 5, and place after clouded glass
One energy meter 6 records transmitted optical power (need to as far as possible select photosurface near the energy meter of front surface)；By reflectance to be corrected
Detector be placed on the position of energy meter 6, using the transmitted optical power calibration detectors of record.
(3) start low power laser therapeutic instrument, low power laser is obtained by detecting head, data acquisition unit and computer and controls
Treat effective laser power of instrument.
The laser therapeutic apparatus reflected light of the present invention and detector for scattered light use 16 photodiodes to be used for entirely anti-
Penetrate detection reflected optical power in space, there is higher accuracy.
Embodiment 3 application example
The laser therapeutic apparatus reflected light of the application present invention and detector for scattered light 30 acceptance of actual measurement in clinic are low
The wrist of the CTS patient of power laser treatment exports the reflectance of laser to laser therapeutic apparatus, to verify its implementation result.
Specific laser therapeutic apparatus reflected light and detector for scattered light are configured to：Laser therapeutic apparatus reflected light by the present invention
It is directly anchored to the existing laser therapeutic apparatus (model that upper Heyman Di Sen Photoelectric Co., Ltd. produces with detector for scattered light
MDC-500-I Pain Therapy by Laser Diode instrument) on, described photodiode 11 specifically adopts the S2386- of Bin Song company
18K photodiode, its parameter is as shown in table 1.Photodiode is connected with pre-amplifying module, and pre-amplifying module is by photoelectricity
Diode output current signal is converted to 0-10V voltage signal, is easy to subsequent acquisition and obtains.Described data collecting card 21 is concrete
Using USB capture card (NI USB-6210), its parameter is as shown in table 2.Remove original output laser head of laser therapeutic apparatus, visit
The overall dimensions of gauge head are about：172mm×62mm×40mm.
Table 1 photodiode parameter
■General ratings/Absolute maximum ratings
■ Electrical and optical characteristics (Typ.Ta=25 DEG C, unless
otherwise noted)
The parameter of table 2 USB capture card
Method according to embodiment 2 calibrates the laser therapeutic apparatus reflected light of the present invention and detector for scattered light, and commercial
Laser therapeutic apparatus support the use, and by the clinical measurement of 30, find that patient individual difference is very notable, effective laser irradiation work(
Rate is very big with the proportional difference of the output of laser therapeutic apparatus, and the laser-bounce coefficient of actual measurement is between 1.32%-53.95%
Wide fluctuations, as shown in Figure 6.Absolutely proved present invention firstly provides the important evidence of laser therapy Outcome measure be real
Survey effective importance of this thinking of laser power and the novelty of the inventive method and feasibility.
The above is only the preferred embodiment of the present invention it is noted that ordinary skill people for the art
Member, on the premise of without departing from the inventive method, can also make some improvement and supplement, these improve and supplement also should be regarded as
Protection scope of the present invention.
Claims (5)
1. a kind of method demarcating the effective laser power of low power laser therapeutic instrument is it is characterised in that comprise the following steps：
a）Laser therapeutic apparatus reflected light and detector for scattered light are arranged on laser therapeutic apparatus front end it is ensured that photodiode is swashing
The laser head surrounding volume arrangement of photo-therapeutic instrument and can accept laser therapeutic apparatus laser head beam direction near 180 degree backward
Interior laser power signal；Described laser therapeutic apparatus reflected light and detector for scattered light be provided with detecting head, data acquisition unit and
Computer；Described detecting head is provided with photodiode and pre-amplifying module；Described data acquisition unit includes data acquisition
Card and power supply；Described data collecting card connects pre-amplifying module, by photodiode collection and via pre-amplifying module
The analogue signal of output is converted to digital signal, and transfers data to computer, completes data processing in a computer；Described
Power supply connect pre-amplifying module, be responsible for pre-amplifying module and power；
b）All of photodiode is calibrated to identical amplification via pre-amplifying module output；
c）Coefficient between analogue signal that calibration photodiode exports via pre-amplifying module and laser power；
d）Start low power laser therapeutic instrument, low power laser therapeutic instrument is obtained by detecting head, data acquisition unit and computer
Effective laser power.
2. method according to claim 1 is it is characterised in that step b）Concrete grammar be：By each photodiode
Correspond to same light source, record the output signal via pre-amplifying module for each photodiode, then calculate phase
The amplification answered simultaneously is corrected.
3. method according to claim 1 is it is characterised in that step c）Concrete grammar be：Swashing laser therapeutic apparatus
Light incides on one block of clouded glass, and places an energy meter record transmitted optical power after clouded glass, by reflection to be corrected
The photodiode of rate is placed on the position of energy meter, using the transmitted optical power calibration photodiode of record.
4. method according to claim 1 is it is characterised in that the number of described photodiode is 20.
5. method according to claim 1 is it is characterised in that described photodiode is uniformly distributed in sector, laser
The incident laser radiation window of head is equivalent to the vacancy of two photodiodes, and the nearly laser of incident laser radiation window side shines
The angle penetrating the photodiode in face is 5 °, the photodiode of nearly coplanar laser illumination of incident laser radiation window opposite side
Angle is 170 °.
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| CN106932175B (en) * | 2017-04-07 | 2019-02-01 | 吉林省科英激光股份有限公司 | A kind of laser cure apparatus power/energy detection device and method |
| CN112445168A (en) * | 2020-11-27 | 2021-03-05 | 南京亿高微波系统工程有限公司 | Power correction system and method for semiconductor laser therapeutic instrument |
| CN116107194B (en) * | 2023-04-13 | 2023-06-09 | 北京新科以仁科技发展有限公司 | Automatic switching control method, device and equipment of laser and storage medium |
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