CN1305447C

CN1305447C - Pulse carbon dioxide laser therapeutic apparatus

Info

Publication number: CN1305447C
Application number: CNB021337101A
Authority: CN
Inventors: 周志康
Original assignee: JINGYU LASER TECHNOLOGY Co Ltd CHONGQING
Current assignee: JINGYU LASER TECHNOLOGY Co Ltd CHONGQING
Priority date: 2002-09-04
Filing date: 2002-09-04
Publication date: 2007-03-21
Anticipated expiration: 2022-09-04
Also published as: CN1480106A

Abstract

The present invention relates to a pulse CO2 laser treatment apparatus which is mainly composed of a CO2 laser device, a joint device, a cooling system, a high-pressure pulse generator and a pulse parameter controller, wherein the CO2 laser device is excited by the high-pressure pulse generator, the treating apparatus is used for pulse output, and the pulse laser energy, the pulse width and the pulse frequency of the treating apparatus are continuously adjustable. The range of the laser pulse width tau is from 0.1 ms to 20 ms. Thereby, the heat injury and corresponding scars and eschar caused by the existing CO2 laser treatment apparatus can be obviously reduced, and the quality of operations is increased.

Description

Pulse carbon dioxide laser therapeutic apparatus

Technical field

The invention belongs to laser medicine device technical field, be specifically related to a kind of pulse carbon dioxide laser therapeutic apparatus.

Technical background

Existing CO ₂Laser therapy aparatus is by high-voltage DC power supply, sealed-off type CO ₂Several parts such as laser instrument, cooling system, joint arm are formed.Because it is simple in structure, safe, reliable, obtained using widely at medical domain.But owing to be output as continuous output, and power regulating range is very little, particularly can not do burst pulse output, and bigger during treatment to organizing the hot injury, easily produce cicatrix or eschar, the operation quality is affected.

Summary of the invention

The object of the present invention is to provide a kind of pulse carbon dioxide laser therapeutic apparatus, by changing electronic pulse width, amplitude and the frequency of excitation power supply, make therapy apparatus do pulse output, its laser pulse width, pulsed laser energy and pulse frequency are adjustable continuously, thereby hot injury and corresponding cicatrix and the eschar eliminating or produce when significantly having reduced existing therapy apparatus treatment, enlarge range of application, improved the operation quality.

Theoretical and experiment shows that laser therapy effect tissue produces after absorbing laser.The laser therapy effect is as if represent the optical parametric T of therapeutic effect F Stimulated Light wavelength X, power density P, irradiation time t (or laser pulse width τ), tissue with a function F ₀With organize thermal parameters T _QInfluence.Promptly

F＝F(T ₀、T _Q、λ、τ、P) ……(1)

After treated tissue and treatment wavelength are determined, establish the therapeutic effect F of this moment ₁Expression, then F ₁It is the function of laser pulse width and power density.Promptly

F ₁＝F ₁(τ、P) ……(2)

Therefore, essence of the present invention is how to change τ and P makes therapeutic effect the best.Traditional CO ₂The major defect of laser therapy aparatus is that the hot injury is big.And the essence that reduces the hot injury is the thermal penetration depth to organizing when reducing laser therapy.Known thermal penetration depth

Z(t)＝(4Kτ) ^1/2 ……(3)

τ is a laser pulse width, and K is the thermal diffusion coefficient of tissue.Penetration depth is the distance of peak temperature 1/e.After being determined by treated tissue, thermal penetration depth mainly is subjected to the influence of τ.Table 1 is the thermal penetration depth of water.

The thermal penetration depth of table 1 water

Time t	1μs	10μs	100μs	1ms	10ms	100ms	1s
Time t	1μs	10μs	100μs	1ms	10ms	100ms	1s	Thermal penetration depth Z (t)	0.7μm	2.2μm	7μm	22μm	70μm	0.22mm	0.7mm

Tissue 70% is a water, the CO of 10.6 μ m ₂Laser water absorbance is very high.The thickness of human body skin epidermis is 66-178 μ m, and the thickness of corium is 400-4000 μ m.The thermal relaxation time of skin is 9ms.Therefore, use the pulse CO of pulse width less than 9ms ₂The hot injury who produces when pulse laser can reduce irradiation greatly simultaneously more can not damage deep tissues.

Technical scheme of the present invention is as follows:

The CO that this pulse carbon dioxide laser therapeutic apparatus is had at existing laser therapy aparatus ₂On laser instrument, joint arm, the cooling system basis, replace original high-voltage DC power supply by high-voltage pulse generator and pulse parameter controller.Pulse parameter controller output pulse control signal is given high-voltage pulse generator, CO ₂Laser instrument is excited by high-voltage pulse generator, makes therapy apparatus do pulse output, and pulsed laser energy E, the pulse width τ of output, frequency f are all adjustable continuously.

High-voltage pulse generator can a high-voltage switch gear element be set in the electrion loop such as 4-3 constitutes, and also can be obtained by high-frequency pulse transformer.

In order to enlarge range of application, the scope of the laser pulse width τ of this therapy apparatus output is set between the 0.1ms-20ms.

Advantage of the present invention is by changing electronic pulse width, amplitude and the frequency of excitation power supply, make laser pulse width, pulsed laser energy and the pulse frequency of therapy apparatus output adjustable continuously, thereby hot injury and corresponding cicatrix and the eschar eliminating or produce when significantly having reduced existing therapy apparatus treatment have improved the operation quality.

Description of drawings

Fig. 1 is pulse CO ₂The structural principle block diagram of laser therapy aparatus;

Fig. 2 is the high electric field pulse Parameter Map of this machine;

Fig. 3 is the schematic diagram of a kind of high-voltage pulse generator of this machine.

The specific embodiment

Fig. 1 is the schematic diagram of this kind therapy apparatus.Among Fig. 1,1 is sealed-off type CO ₂Laser instrument, 2 is exported through joint arm 2 couplings for the laser of joint arm, laser instrument 1 output and is treated.3 is cooling system, in order to laser instrument is cooled off.4 is high-voltage pulse generator, and the high-voltage pulse of its generation is in order to excitation laser 1.5 is the pulse parameter controller, in order to the electronic pulse width (τ of control high-voltage pulse generator generation ₀), amplitude (V) and repetition rate (f=1/T).The high electric field pulse parameter as shown in Figure 2.The minimum of pulse voltage V is CO ₂Laser tube firing voltage V _F(i.e. the voltage that just triggers).At electronic pulse width τ ₀Under the situation about determining, along with the increase of electric pulse voltage, in certain scope, the also corresponding increase of ENERGY E of the laser pulse of therapy apparatus output.Along with the increase of frequency f, the also corresponding increase of the average output power of therapy apparatus.

Fig. 3 is a kind of implementation of the high-voltage pulse generator of this machine.High voltage power supply is in series by high-voltage capacitance 4-1 and 4-2, and the voltage of 4-1 is V ₁, the voltage of 4-2 is V ₂V ₁With V ₂Voltage select like this: (V ₁+ V ₂) greater than the firing voltage V of laser instrument 1 _F, V ₂Minimal maintenance voltage V less than laser instrument 1 ₀, general V ₂≈ 80%V ₀4-3 is an impulse modulator tube, and its control gate is by 5 controls of pulse parameter controller.Before pulse parameter controller 5 did not provide pulse control signal, laser instrument 1 discharge that is not triggered did not produce laser.After pulse parameter controller 5 provides pulse control signal, impulse modulator tube 4-3 conducting, laser instrument 1 two ends add (V ₁+ V ₂) voltage discharge generation laser at once.After signal removed, impulse modulator tube 4-3 turn-offed, and laser instrument 1 stops discharge, and laser stops output.Pulse width and frequency and trigger impulse parameter correspondence that laser produces.

High voltage power supply is in series by electric capacity 4-1,4-2, is in order to reduce the insulation voltage of impulse modulator tube.

Certainly, also available other high-voltage switch gear element of impulse modulator tube 4-3 is replaced.The high electric field pulse generator can also produce by other method, obtains as available high-frequency pulse transformer.

As an example, by changing electric pulse parameter τ ₀, V, f, the pulsed laser energy E of its therapy apparatus is that a few milli Jiao-hundreds of milli is burnt, laser pulse width τ is 0.1ms-20ms, the repetition rate of laser pulse is 1-99 time/second.The clinical experiment of the therapy apparatus of this example shows than existing CO ₂Hot injury when the laser therapy function significantly reduces treatment has improved the operation quality.

Claims

1, a kind of pulse carbon dioxide laser therapeutic apparatus comprises CO ₂Laser instrument (1), joint arm (2), cooling system (3), high-voltage pulse generator (4) and pulse parameter controller (5), pulse parameter controller (5) output pulse control signal is given high-voltage pulse generator (4), CO ₂Laser instrument (1) is excited by high-voltage pulse generator (4), it is characterized in that: it excites electrical pulse amplitudes V, pulse width τ ₀Adjustable continuously with frequency f, make therapy apparatus do pulse output, pulsed laser energy E, pulse width τ, the frequency f of output are adjustable continuously, and the width τ of laser pulse is between 0.1ms-20ms.

2, pulse carbon dioxide laser therapeutic apparatus according to claim 1 is characterized in that in the electrion loop of high-voltage pulse generator (4) a high-voltage switch gear element being arranged.

3, pulse carbon dioxide laser therapeutic apparatus according to claim 2 is characterized in that the high-voltage switch gear element is impulse modulator tube (4-3).