CN2762395Y - Medical green laser generator and system - Google Patents
Medical green laser generator and system Download PDFInfo
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- CN2762395Y CN2762395Y CN 200520000745 CN200520000745U CN2762395Y CN 2762395 Y CN2762395 Y CN 2762395Y CN 200520000745 CN200520000745 CN 200520000745 CN 200520000745 U CN200520000745 U CN 200520000745U CN 2762395 Y CN2762395 Y CN 2762395Y
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Abstract
The utility model relates to a medical green laser generator and system, which includes a laser pumping source, a current supply and a total reflector, a laser crystal, a frequency doubling crystal, an output mirror which are on the same light path, and also a controller, an acoustic-optic actuator and a switch Q which is on the same light path. The switch Q is electrically connected with the acoustic-optic actuator, and the laser pumping source is electrically connected with the laser crystal. The controller is electrically connected with the acoustic-optic actuator, and the laser pumping source and the current supply are electrically connected with theacousto-optic actuator, the controller and the laser pumping source. The utility model also relates to a medical green laser system including the forenamed medical green laser generator, and also a refrigeration machine and a refrigeration circulating system which are used for refrigerating the laser generator. The refrigeration machine connects with and controls the refrigeration circulating system. Therefore, when the laser of the medical green laser generator and system acts on tissues which are rich in hemoglobin, which realizes excellent vaporization cutting and blood stopping and avoids interferences of hot wind and noise produced by the laser system.
Description
Technical field
The utility model relates to a kind of medical green generating device of laser and system, and especially a kind of green laser that uses two width pulses acts on the medical green generating device of laser and the system that are rich in the erythrocyte tissue.
Background technology
Laser has high brightness (high power), high directivity (forms high power density/high-energy-density, be easy to control and light is focused on the target spot, the laser of some wavelength can also be used fiber optic transmission, import light into body cavity), characteristics such as the monochromaticjty selectivity of different material (be beneficial to absorb) and coherence, make laser in medical science, obtain extensive use.Wherein most of medical applications are that the thermal effect of utilizing laser energy is solidified, carbonization and vaporization tissue, make when injected organism tissue vaporization or cutting and reach the purpose of treatment.Successively have many lasers to be used for medical treatment, be semiconductor laser of 810nm or 980nm or the like as Nd:YAG (1.06 μ m), frequency multiplication Nd:YAG (532nm), Ho:YAG (2.09 μ m), Er:YAG (2.9 μ m), CO2 (10.6 μ m), wavelength for this reason.
Human body soft tissue is because of its composition, and is as the difference of protein, hemoglobin, moisture tissue and pigment, therefore also different to the absorption of different wavelength of laser.As oxygen base hemoglobin to the absorptivity of the light of 532nm than high about 15 times of the semiconductor laser of 830nm, than high about 120 times of the Ho:YAG laser of the Nd:YAG laser of 1064nm wavelength and 2.1 microns.And for the soft tissue that contains a large amount of moisture, water to the absorptivity of the light of 532nm than low about 100 times of the absorptivity of the semiconductor laser of 830nm, than low about 500 times of the Nd:YAG laser of 1064nm wavelength, low about 100,000 times of the Ho:YAG laser than 2.09 microns.1.44 the Nd:YAG laser of mum wavelength is similar to the Ho:YAG laser activity.When tissue was high to the laser absorption rate of certain wavelength, its infiltration was organized shallow, and the vaporization tissue is fast, was suitable for melting and cut this tissue.When tissue was low to the laser absorption rate of certain wavelength, then infiltration was organized deeplyer, and heated perimeter is big, and temperature rise is slow, and its function is suitable for solidified structure and hemostasis.This shows that particular organization is the principal element of its cutting of decision or hemostatic function to the absorptivity of this wavelength laser.Therefore the best optical maser wavelength that is used to be rich in the cutting of hemoglobin tissue vaporization is the green laser of 532nm.This is just after 1064nm Nd:YAG laser is used to be rich in the resection of hemoglobin tissue, when the average power of pulse green laser can reach power demand, select green laser to substitute the reason that 1064nm Nd:YAG is applied to the benign prostatic hyperplasis stereotomy.
The green laser system that is applied to be rich in the hemoglobin tissue resection at present all is the green laser that the near infrared light frequency multiplication of logical 1064nm wavelength to Nd:YAG output obtains the 532nm wavelength.But the shg efficiency of the Nd:YAG laser of output is very low continuously, so equipment is difficult to reach the desired power that undergos surgery.And Pulse Nd: the shg efficiency of YAG laser is very high, all is pulse lasers so be used for the medical green laser system of this operation, and its average power output can be arrived tens of watts.
The acquisition of 1064nm pulse near-infrared laser can utilize xenon flash lamp pumping source Nd:YAG laser crystal directly to produce the pulse laser of 1064nm, its mode of operation is called static state (non-accent Q state), pulse duration is in hundred microsecond magnitudes, and peak power is about kilowatt magnitude; Above-mentioned pulse laser obtains the narrower 1064nm laser pulse of pulsewidth through transferring Q, and its pulse duration is the 10ns magnitude, so peak power can surpass megawatt.Produce the 1064nm laser of output continuously with continuous krypton lamp pumping source Nd:YAG laser crystal, obtain pulse laser with acousto-optic Q modulation again, but only hundreds of hours krypton lamp life-span, available semiconductor laser substitutes it and makes pumping source, and the life-span was thousands of hours; With the diode-end-pumped Nd:YAG laser crystal of continuous output, obtain the 1064nm pulse laser through acousto-optic Q modulation.
The acquisition of the green laser of 532nm pulse can obtain the green laser of 532nm through KTP nonlinear crystal frequency multiplication with the 1064nm fundamental frequency light of pulse, so abbreviate KTP laser again as; Also can obtain the green laser of 532nm through LBO nonlinear crystal frequency multiplication with the 1064nm fundamental frequency light of pulse.The green laser of 532nm pulse that laser produces all is transferred to laser coupled in the optical fiber target position of treated tissue with fiber coupler.
At present, acting on the medical laser generator that is rich in the hemoglobin tissue all is the laser of single wavelength, and therefore for same tissue, cutting and vaporization effect are good or coagulation is effective.For the soft tissue that is rich in hemoglobin, use the laser of 1064nm wavelength, coagulation effective, and cutting power is poor, uses the laser of 532nm wavelength, cutting and vaporization are relatively good, and the coagulation ability.But it is when acting on the soft tissue that is rich in water, then just in time opposite.
To a certain specific wavelength and particular organization, the height of laser power can change its cutting performance or anthemorrhagic performance.For example, continuously output wavelength is semiconductor laser some lasers that get both between coagulation and vaporization cutting function like this of Nd:YAG, the 810nm of 1.06 μ m or 980nm, can reach several millimeters more deeply to moisture abundant soft tissue infiltration, therefore coagulation function is preferably arranged.When they are output as the low-power of watt level, be not enough to vaporization tissue rapidly, so the coagulation effect is better, is rendered as the hemostasis cutter; But when power is increased to tens of watts high power, can make irradiated local organization temperature rise,, cut and organize until vaporization from being solidified to carbonization.Being unfavorable for healing although cause the damage that surrounding tissue is bigger, is to be rendered as the cutter performance.So the power height also is one of factor of its hemostasis of decision or cutting function.For the laser of a certain specific wavelength, the width of pulse laser output pulse is narrower, and peak power is higher.Because the pulsed laser action time is short, heat has little time diffusion just can make local organization heating carbonization or vaporization, so cutting performance is better than the continuous laser of this wavelength.If pulse laser transfers Q to obtain giant pulse again, the vaporization cutting performance will be better.
In order to improve the cutting performance of continuous laser, can use the method for acousto-optic Q modulation to make continuous wave laser form hard pulse output.Because pulse duration shortens dramatically, can make average power is that the pulse peak power of the pulse laser of ten watts of levels reaches hundreds of watts even thousands of watts.Thereby improved cutting power, reduced damage, also weakened but the thing followed is a hemostatic function to surrounding tissue.This shows, for the laser of specific wavelength, the mode of operation of laser (continuously/pulse), the power height, and the adjustment of pulse duration (adjustment that peak power changes thereupon) also is one of principal element of its cutting of decision or hemostatic function.
The pulse laser that average power to a certain specific wavelength laser is identical, repetition rate is also identical, the laser cutting performance that pulse width and peak power are high after ovennodulation is good; Otherwise pulsewidth is very wide, and power just has anthemorrhagic performance preferably when low.
At present, medical green generating device of laser has following shortcoming:
1, the shortcoming of single wavelength generating device of laser.
Because existing medical green generating device of laser all can only produce the laser of single wavelength, therefore as seen the analysis that the optical maser wavelength selectivity is absorbed from tissue or is applicable to the vaporization cutting very much, or is more suitable for coagulation.As use the cutting of vaporizing of green laser to be rich in hemoglobin tissue, and the cutting performance of vaporizing is fine, and the coagulation performance is just poor, so it can not solidify cut blood vessel well and avoid bleeding in the art.This is the deficiency of the green laser of single 532nm wavelength.
2, the shortcoming of the medical pulse green laser system existence of the frequency multiplication Nd:YAG in diode-end-pumped source.
The pumping advantage in a steady stream that semiconductor laser is made Nd:YAG laser is the efficient height, and life-span length can reach ten thousand hours, exempts the maintenance of changing.Therefore be advanced technology, but deficiency is also arranged.Because the increase and decrease of the supply current of semiconductor laser must be very slow, otherwise will damage semiconductor laser.For example green laser to be transferred to the operation power demand and need 20 minutes approximately, need to regulate power in the operation and also must slowly carry out, be not easy to use.
3, the deficiency of static pulse green laser.
Directly produce the static pulse laser of 1064nm with xenon flash lamp pumping source Nd:YAG laser crystal, because of its pulse duration in hundred microsecond magnitudes, peak power is about kilowatt magnitude.Through frequency multiplication, green peak-power of laser pulse is the hectowatt magnitude only.The maximum peak power of the green generating device of laser that present average power is 80W is less than 300W.Because the speed of vaporization cutting is relevant with peak power,, therefore influenced its vaporization cutting performance because the peak power of this structure laser is high not enough.
4, the shortcoming of present medical laser syste.
Present medical pulse green laser system is mostly by laser (containing Q-switch, frequency-doubling crystal etc.), Optical Fiber Transmission, Laser Power Devices, compositions such as cooling water circulation and refrigeration machine.And this system is contained in these parts in the complete machine at present, for reduced volume is not adorned refrigeration machine, needs external running water cooling, as installs refrigeration machine additional, and then machine volume is inevitable bigger; Some dresses up the annex of standalone chassis as complete machine in addition with refrigeration machine and cooling circulating water.The more important thing is that noise was bigger when refrigerating units was opened, ventilating fan heat is disturbed big, and the dust and the bacterium of also easily kicking up operating room are unfavorable for surgical environments.
The utility model content
The purpose of this utility model is when the laser action of generating device of laser is rich in the tissue of hemoglobin, can realize that good vaporization cutting can realize good coagulation again.
Second purpose of the present utility model is to realize the long service life of generating device of laser.
The 3rd purpose of the present utility model is that the use power of realizing generating device of laser is regulated easily.
The 4th purpose of the present utility model is to realize the high-peak power of generating device of laser, makes laser have good vaporization cutting performance.
The 5th novel purpose of this use is to realize avoiding the hot blast of laser system generation and the interference of noise.
For achieving the above object, the utility model provides a kind of medical green generating device of laser, comprise laser pump source and power supply, and the completely reflecting mirror on a light path, laser crystal, frequency-doubling crystal and outgoing mirror, also include controller, Q switching on the acousto-optic driver and the described light path that coexists, described Q switching is electrically connected mutually with acousto-optic driver, described laser pumping source is electrically connected mutually with laser crystal, described controller and acousto-optic driver, laser pumping source phase is electrically connected, described power supply and acousto-optic driver, controller is electrically connected mutually with laser pump source.
Also has optical gate on the light path of the described outgoing mirror outside.Also have the light microscopic that closes that becomes 45 degree with described light path on the light path of the described outgoing mirror outside, a pilot light generator that is connected with described power supply, the laser vertical of its generation is injected the described intersection point that closes light microscopic and light path in described light path.Described pilot light generator is a 650nm pilot light generator.The described light microscopic that closes is two-sided plating film, and this film has high permeability to the green laser of 532nm, and the indication laser of 650nm has high reflectance.Also have fiber coupler on the light path of the described outgoing mirror outside, this fiber coupler also is connected with optical fiber.Also has attenuator on the light path of the described outgoing mirror outside.Described attenuator is a multi-disc, the attenuation rate difference of each sheet.Described laser pumping source is the semiconductor laser pumping source.Described laser crystal is Nd YAG.Described frequency-doubling crystal is lbo crystal or ktp crystal.
The utility model also provides a kind of system that comprises above-mentioned medical green generating device of laser, also is included as the refrigeration machine and the cooling cycle system of described generating device of laser refrigeration, and described refrigeration machine connects and the control cooling cycle system.
Therefore, medical green generating device of laser of the utility model and system have the following advantages:
1, generating device of laser is realized the output of distinct pulse widths laser, makes laser action when being rich in the tissue of hemoglobin, has not only realized good vaporization cutting but also realized good coagulation.
2, the long service life of generating device of laser.
3, the use power of laser is easy to adjust.
4, realize the high-peak power of generating device of laser, make laser have good vaporization cutting performance.
5, the interference that hot blast and noise produced of having avoided laser system to produce.
Below in conjunction with drawings and Examples, the technical solution of the utility model is described in further detail.
Description of drawings
Fig. 1 is the structural representation of the medical green generating device of laser of the utility model.
The timing chart that Fig. 2 is produced for the medical green generating device of laser of the utility model.
Fig. 3 is the structural representation of the medical green laser system of the utility model.
Fig. 4 is another structural representation of the medical green laser system of the utility model.
Embodiment
As shown in Figure 1, be the structural representation of the medical green generating device of laser 1 of the utility model.Completely reflecting mirror 10, acoustooptic Q-switching 11, Nd YAG laser crystal 12, LBO frequency-doubling crystal 13 (also can use ktp crystal), outgoing mirror 14, attenuator 15, optical gate 16 and fiber coupler 17 are all on same light path 100, fiber coupler 17 connects optical fiber 2, have on the light path 100 between optical gate 16 and the fiber coupler 17 with 100 one-tenth 45 of light paths degree close light microscopic 7, close the anti-reflection film that light microscopic 7 and optical gate 16 adjacent one sides are coated with 532nm, be coated with the high-reflecting film of 650nm in the one side adjacent with fiber coupler 17, and 532nm had high-permeability, the laser vertical that the pilot light generator 8 of 650nm sends 650nm is injected in light path 100 and is closed the intersection point that light microscopic 7 is coated with high-reflecting film one side with the light path 100 of 650nm, enter output in the optical fiber 2 through the reflection of closing light microscopic 7 by fiber coupler 17, in use, the red laser of 650nm is used to indicate the target spot of the green laser action of 532nm.Semiconductor laser pumping source 3 pumping laser crystal 12, controller 4 guide sound CD-ROM driver 6 and laser pumping source 3, acousto-optic driver 6 drives Q switching 11, and power supply 5 is acousto-optic driver 6, laser pumping source 3 and controller 4 power supplies.
Power supply produces near-infrared laser pumping Nd:YAG laser crystal to semiconductor laser by controller 4 controls, excite neodymium (Nd) ion to form population inversion to upper laser level, the particle of last energy level is when ground state transition, produce the light radiation of 1064nm wavelength, (between two eyeglasses) produce stimulated radiation vibration amplification in resonant cavity, form pulse through the acoustooptic switch modulation, produce the green laser output of 532nm again through the frequency-doubling crystal frequency multiplication.
As required laser output is modulated, the cutting of vaporizing of output high-power burst pulse, or low power wide pulse/low-power is exported continuously and is carried out coagulation.
Modulator approach is to drive acoustooptic Q-switching 11 by controller 4 by acousto-optic driver 6, cuts through the vaporization that the green laser of the narrow pulsewidth high-peak power of acoustooptic Q-switching 11 modulation outputs is organized.Also can drive the modulating frequency that acoustooptic Q-switching 11 outputs are higher than 10kHz by acousto-optic driver 6 by controller 4, increase the width of output laser pulse, the shg efficiency of modulated 1064nm broad pulse laser is very low, thereby helps to produce lower powered green laser, is used for coagulation.
The method that control is switched can be mechanical switch mode: adopt both feet to step on switch switching controls narrow pulsewidth high-peak power laser pulse and low power wide pulse or continuous laser respectively, alternately realize vaporization cutting and coagulation.Also can be automatically controlled switch mode: alternately export narrow pulsewidth high-peak power laser pulse and low power wide pulse or continuous laser with the program control that can be provided with by electronic circuit.Output waveform as shown in Figure 2.
To change green laser output power slowly time-consuming and can not satisfy the shortcoming of operation demand with adjusting the semiconductor laser electric current in order to solve, and just can regulate power output rapidly with the attenuator of the different transmitances of insertion.
Because only some is absorbed and is converted to excitation energy laser crystal when pumping is imported lot of energy in a steady stream, remainder will change heat into makes laser crystal produce thermal lensing effect.When regulating power with the method that changes the semiconductor laser operating current, the variation of pumping source power can change the size of heat, also can cause the variation of thermal lensing effect and changed the shake running parameter in chamber of chamber, destroy the optimum Working of laser and the stability of work.
Regulate laser output power with inserting attenuator outside the chamber, not only both simple and efficient, can regulate at any time according to the operation needs; And bring another benefit, it can not change the running parameter of resonant cavity, and laser is operated under the stable optimum state of rated power always.Like this in when design, can adjust the parameter of resonant cavity eyeglass according to the size of the thermal lensing effect of laser when the rated output power, make laser operating state the best when rated power is exported.
Therefore this generating device of laser is realized the output of distinct pulse widths laser, makes laser action when being rich in the tissue of hemoglobin, has not only realized good vaporization cutting but also realized good coagulation.Can also the value of peaking power, make laser have good vaporization cutting performance.
Use the attenuator of similar and different attenuation rate, can obtain the various use power of laser very easily, as use 10%, 20%, 30%, 40% and 50% attenuator.
During use, when being 100W as whole power of laser of output, all attenuators do not add light path, and laser is not through overdamping; When needing the power of 90W, 10% attenuator is put into light path; When needing the power of 80W, 70W, 60W or 50W, use 20%, 30%, 40% or 50% attenuator; When needing the power of 40W, put into 20% and 50% attenuator simultaneously; When needing 30W, 20W or 10W, use 40% to add 50%, 60% and add 50% or 80% and add 50% attenuator,, can obtain needed luminous power so the use power of laser is easy to adjust,
As shown in Figure 3, be the structural scheme of mechanism of a kind of medical green laser system of the utility model.Medical green laser system comprises generating device of laser 1, and its structure as above embodiment is described, repeats no more herein, and controller 4 control refrigeration machine 90 and circulating cooling systems 91 drive cooling system 91 by refrigeration machine 90 and give described laser system cooling cooling.
In use, controller 4 and optical fiber 2 can be put into the operating room use, and other structures of medical green laser system can place equipment room, in addition, can transmit laser 200 and a control cable 40 transmission of control signals (as shown in Figure 4) between two controllers 4 by a optical fiber 2 by between with same connector 20, avoid the interference of noise and hot blast, kept the environment of operating room.Small and exquisite being convenient to of controller placed at operating room, is convenient to operation simultaneously again.Perhaps refrigeration machine 90 is placed out operating-room, other structures of system place in the operating room, are connected the interference that can avoid noise and hot blast like this with cable by water pipe, have kept the environment of operating room.The refrigeration machine 90 and the circulatory system 91 can be placed out operating-room again, other structures of system place in the operating room, can avoid the interference of noise and hot blast like this, have kept the environment of operating room.
It should be noted last that, above embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (12)
1, a kind of medical green generating device of laser, comprise laser pump source and power supply, and completely reflecting mirror, laser crystal, frequency-doubling crystal and outgoing mirror on a light path, it is characterized in that: also include controller, acousto-optic driver and the described light path that coexists on Q switching, described Q switching is electrically connected mutually with acousto-optic driver, described laser pumping source is electrically connected mutually with laser crystal, described controller and acousto-optic driver, laser pumping source phase are electrically connected, and described power supply is electrically connected mutually with acousto-optic driver, controller and laser pump source.
2, medical green generating device of laser according to claim 1 is characterized in that: also have optical gate on the light path of the described outgoing mirror outside.
3, medical green generating device of laser according to claim 1 and 2, it is characterized in that: also have the light microscopic that closes that becomes 45 degree with described light path on the light path of the described outgoing mirror outside, a pilot light generator that is connected with described power supply, the laser vertical of its generation is injected the described intersection point that closes light microscopic and light path in described light path.
4, medical green generating device of laser according to claim 3 is characterized in that: described pilot light generator is a 650nm pilot light generator.
5, medical green generating device of laser according to claim 3 is characterized in that: the described light microscopic that closes is two-sided plating film, and this film has high permeability to the green laser of 532nm, and the indication laser of 650nm is had high reflectance.
6, medical green generating device of laser according to claim 1 is characterized in that: also have fiber coupler on the light path of the described outgoing mirror outside, this fiber coupler also is connected with optical fiber.
7, medical green generating device of laser according to claim 1 is characterized in that: also have attenuator on the light path of the described outgoing mirror outside.
8, medical green generating device of laser according to claim 7, it is characterized in that: described attenuator is a multi-disc, the attenuation rate difference of each sheet.
9, medical green generating device of laser according to claim 1, it is characterized in that: described laser pumping source is the semiconductor laser pumping source.
10, medical green generating device of laser according to claim 1, it is characterized in that: described laser crystal is Nd YAG.
11, medical green generating device of laser according to claim 1, it is characterized in that: described frequency-doubling crystal is lbo crystal or ktp crystal.
12, a kind of system that comprises the described medical green generating device of laser of claim 1 is characterized in that: also be included as the refrigeration machine and the cooling cycle system of described generating device of laser refrigeration, described refrigeration machine connects and the control cooling cycle system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520000745 CN2762395Y (en) | 2005-01-12 | 2005-01-12 | Medical green laser generator and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520000745 CN2762395Y (en) | 2005-01-12 | 2005-01-12 | Medical green laser generator and system |
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| CN2762395Y true CN2762395Y (en) | 2006-03-01 |
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| CN 200520000745 Expired - Fee Related CN2762395Y (en) | 2005-01-12 | 2005-01-12 | Medical green laser generator and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107046224A (en) * | 2017-06-07 | 2017-08-15 | 中国科学院半导体研究所 | The laser of the double width pulses of pulse pump actively Q-switched output |
| CN109755852A (en) * | 2017-11-07 | 2019-05-14 | 核工业理化工程研究院 | Based on the controllable Solid State Laser output-controlling device of multimode and control method |
| CN111201063A (en) * | 2017-10-16 | 2020-05-26 | 杰希思医疗集团株式会社 | Therapeutic laser device for combined irradiation of skin with different pulse widths |
-
2005
- 2005-01-12 CN CN 200520000745 patent/CN2762395Y/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107046224A (en) * | 2017-06-07 | 2017-08-15 | 中国科学院半导体研究所 | The laser of the double width pulses of pulse pump actively Q-switched output |
| CN107046224B (en) * | 2017-06-07 | 2020-04-03 | 中国科学院半导体研究所 | Laser for pulse pump active Q-switching output double-pulse width pulse |
| CN111201063A (en) * | 2017-10-16 | 2020-05-26 | 杰希思医疗集团株式会社 | Therapeutic laser device for combined irradiation of skin with different pulse widths |
| CN109755852A (en) * | 2017-11-07 | 2019-05-14 | 核工业理化工程研究院 | Based on the controllable Solid State Laser output-controlling device of multimode and control method |
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