WO2020159017A1

WO2020159017A1 - Medical multi-laser amplification output device

Info

Publication number: WO2020159017A1
Application number: PCT/KR2019/009032
Authority: WO
Inventors: 김정현; 백영준; 문준영; 조성철
Original assignee: 원텍 주식회사
Priority date: 2019-01-30
Filing date: 2019-07-22
Publication date: 2020-08-06
Also published as: KR102004169B1

Abstract

The present invention relates to a medical multi-laser amplification output device comprising: an optical resonance unit including a plurality of laser cavities, and an optical system for forming a single output laser beam by guiding, in a single path, lights sequentially outputted from the plurality of laser cavities; a processor unit for controlling the optical resonance unit by determining the energy that excites a medium of the laser cavity; and a cooling unit for controlling the temperature of the optical resonance unit, wherein, in a step of controlling an initial pulse of the laser cavity, the processor unit applies an offset signal of which a pulse width gradually increases so as to fix the pulse width of the offset signal when approaching a set output value of the laser cavity, thereby adjusting the offset of the optical resonance unit.

Description

Medical multi-laser amplification output device

The present invention relates to a medical multi-laser amplification output device that amplifies laser output with a plurality of laser cavities and outputs laser light capable of hemostasis simultaneously with incision.

The laser, which is recognized as a basic tool in medical procedures, is hundreds of milliseconds (10 ^-3 ) seconds in short pulses of femto (10 ^-15 ) seconds depending on various wavelengths, high energy density, and operation method. As a method for selectively treating pigmented lesions or vascular lesions by utilizing the characteristics of a laser providing a pulse width ranging from is introduced, it is actively applied in medical applications. The laser is an argon laser that incinerates human tissues according to the wavelength and energy characteristics, a CO ₂ laser using properties such as a helium neon laser used for laser acupuncture or blood flow velocity measurement, and a tissue removed with a knife, which can be identified with the eye. It is classified as a yag (YAG) laser used for treatment by using incision properties.

Compared to the need to open a large field of view in order to perform a mechanical surgery, the surgical laser enters the human body through a very narrow hole and connects it with an optical fiber or a small endoscope camera, thereby providing the advantage of minimally invasive surgery. Have Examples of the application include prostate treatment, laryngeal cancer treatment, heart laser treatment, and disc surgery. Surgical laser equipment has been actively applied in all medical fields due to the spread of minimally invasive surgical methods, and research on improving shorter pulses and high-power laser equipment has been actively conducted.

When describing the surgical laser applied to the prostate procedure as an example, in the conventional case, an Andy Yag (Nd:YAG) laser was mainly used. Since the Andy Yag laser is a low-power method, the power of the laser is weak, so it is unable to vaporize unnecessary tissue properly. When the laser is cut on the prostate tissue, the surrounding normal tissue burns or swells. Andiyag lasers have been treated with urine for more than two weeks because of prostate swelling after the procedure. Thereafter, the KTP laser technique was introduced. The KTP laser had the advantage of accurately targeting only the prostate enlarged by a high-power method with strong power and burning it. However, KTP lasers also showed limitations when the prostate tissue was greatly enlarged. Recently, as a more advanced technique, a prostate procedure (HoLEP technique) using a holmium laser having a wavelength of about 2100 nm has attracted attention. Holmium lasers insert instruments through the urethra and tear tissue from the inside out. Holmium laser has the advantage of being able to completely remove the enlarged prostate tissue with fewer side effects than conventional laser techniques for crushing and removing tissue.

In the present specification, a multi-laser amplification output device that can be applied to the above-mentioned treatment laser, in particular, holmium laser equipment is disclosed. Medical laser equipment uses light pumping means to excite the solid-state gain medium into the laser state. For example, the gain medium may be a cylindrical laser rod and the light pumping means may be a flash lamp positioned parallel to the rod and extending in the longitudinal direction. Most gain media must be maintained at a high temperature during the razing operation. However, it is desirable that the Ho:YAG (holmium yag) or Ho:YLF material and other Holmium doped gain media be kept at a low temperature during the razing operation. Since most light pumping means increase the temperature to a high level, a cooling system is required in the above laser system, and should be maintained in the range of approximately +10°C to -10°C.

As a related art, U.S. Patent No. 999631 (hereinafter abbreviated as'prior patent') discloses a device having a plurality of laser cavities that are sequentially pumped. The preceding patent suggests a control configuration for controlling the output lasers of the plurality of laser cavities to the center point of the servo mirror.

Surgical laser equipment used for medical purposes requires a high degree of precision in the process of forming an output laser. Great sensitivity is required in the arrangement, angle, and curvature of the optical system mirror for laser focusing, and adjustment of the offset is also a very difficult technical problem due to the characteristics of the optical resonator having a multi-channel laser cavity. In addition, the temperature control of the laser cavity affects the performance of the laser and, unlike the conventional gain medium maintained at a high temperature, the holmium laser equipment must be properly equipped with a cooling system for maintaining a low temperature. In addition, due to the nature of medical equipment, stability in the event of equipment failure must also be ensured.

Accordingly, the present applicant has devised a medical multi-laser amplification output device capable of controlling the optical system configuration, precise offset adjustment, and stable sequence control that are advantageous for laser focusing of the servo mirror, and capable of appropriately controlling the temperature of the optical resonator.

[Advanced technical literature]

[Patent Document]

Patent Document 1. U.S. Registered Patent No. 9939631

The present invention is to provide a medical multi-laser amplification output device having an optical system configuration that is advantageously incident on the optical fiber by minimizing the divergence angle of the laser resonating in the laser cavity.

In addition, the present invention is to provide a medical multi-laser amplification output device capable of controlling the offset to eliminate errors that may be sensitive to output pulses such as overshoot depending on the environment such as equipment and temperature.

In addition, the present invention is to provide a medical multi-laser amplification output device that can ensure the continuity of output even if an error occurs in any one optical resonance system in a multi-channel laser cavity.

In addition, the present invention is to provide a cooling system having a high cooling efficiency with a minimum volume to provide a medical multi-laser amplification output device capable of maintaining the optical resonator at a low temperature.

In order to achieve the above object, the present invention, in a medical multi-laser amplification output device, a plurality of laser cavities, and the optical system to form a single output laser by guiding the light sequentially output by the plurality of laser cavities in a single path An optical resonator configured; A processor unit configured to control the optical resonance unit by determining energy to excite the medium of the laser cavity; And a cooling unit that controls the temperature of the optical resonance unit, and the processor unit, when controlling an initial pulse of the laser cavity, applies an offset signal that gradually increases in pulse width to reach a set output value of the laser cavity. The offset of the optical resonator is adjusted by fixing the pulse width of the offset signal.

Preferably, when the offset signal is applied, the processor may gradually increase the pulse width of the offset signal while the voltage of the offset signal is fixed.

Preferably, the optical system, each of the laser cavity, a pair of reflector mirrors provided before and after the laser rod; And a relay mirror for focusing light output through the pair of reflector mirrors, and further guiding a light reflected from each relay mirror provided in each laser cavity to an output line, The servo mirror, while being rotated under the control of the processor unit, focuses light output by each laser cavity sequentially into a single path of the output line, and the reflector mirror includes a rear reflector mirror positioned at the rear side of the laser rod. A front surface reflector mirror having a negative curvature surface and located on the front surface of the laser rod may have a flat surface.

Preferably, when an error occurs in any one of the laser cavities of each of the laser cavities, the output order of the laser cavity in which the error occurs is excluded from the sequence, and the sequence is skipped to the next laser cavity to output the output. The optical resonator may be controlled to ensure continuity.

Preferably, the cooling unit is connected to the optical resonance unit, a cooling pump for supplying cooling water; And a supply line connected to the optical resonator unit of the cooling pump, and a radiator having a line through which some of the cooling water supplied to the optical resonator unit is introduced.

In addition, the present invention is a medical multi-laser amplifying output device, comprising: a plurality of laser cavities and an optical resonator comprising an optical system that guides light sequentially output by the plurality of laser cavities into a single path to form a single output laser; A processor unit configured to control the optical resonance unit by determining energy to excite the medium of the laser cavity; And a cooling unit that controls the temperature of the optical resonator, and the processor unit, when an error occurs in any one of the laser cavities of each of the laser cavities, excludes an output sequence of the laser cavity in which the error occurred in a sequence, and the next laser. Another feature is to control the optical resonator to ensure continuity of output by instructing the cavity to skip the sequence.

According to the present invention, the problem that the offset value theoretically calculated due to the problem of the stabilization section and overshoot of the laser was not accurately reflected in the actual output value is solved. In addition, the present invention has an optical system structure in which incident on the output line is advantageous by minimizing the divergence angle of the resonant laser. In addition, the present invention can provide high cooling efficiency in a small volume by providing a cooling system in which cooling water flows in parallel by a supply line connected to an optical resonator branch. In addition, the present invention controls to ensure the continuity of the output by excluding the output order of the laser cavity in which the error occurred from the sequence and skipping the order to the next laser cavity. Accordingly, the present invention can provide a medical multi-laser amplification output device capable of precise laser output and stable control.

1 shows a medical multi-laser amplification output device according to an embodiment of the present invention.

2 shows an optical resonator according to an embodiment of the present invention.

3 shows an optical system according to an embodiment of the present invention.

4 shows a control driving state of a servo mirror according to an embodiment of the present invention and an optical path accordingly. 4A shows an optical path when a first laser cavity is output among four laser cavities according to this embodiment. 4B shows the optical path when the second laser cavity is output among the four laser cavities according to the present embodiment.

5 shows a cooling unit according to an embodiment of the present invention.

6 shows a cooling water circulation path of a cooling unit according to an embodiment of the present invention.

7 shows a control screen of a processor unit according to an embodiment of the present invention.

8 shows the offset control principle of the processor unit according to an embodiment of the present invention. 8A shows a conventional offset signal and thus an output waveform. 8B shows an offset signal and a corresponding output waveform of the processor unit according to an embodiment of the present invention.

9 illustrates a sequence control principle of a processor unit according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the contents described in the accompanying drawings. However, the present invention is not limited or limited by the exemplary embodiments. The same reference numerals in each drawing denote members that perform substantially the same function.

The objects and effects of the present invention may be naturally understood or more apparent by the following description, and the objects and effects of the present invention are not limited only by the following description. In addition, in the description of the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

1 shows a medical multi-laser amplifying output device 1 according to an embodiment of the present invention. Referring to FIG. 1, the multi-laser amplification output device 1 may include an optical resonance unit 10, a processor unit 30, a cooling unit 50, and a display unit 70. In FIG. 1, the cooling unit 50 is located on the opposite side of the body where the processor unit 30 is located. Therefore, the shape of the cooling unit 50 will be described later with reference to FIGS. 5 and 6.

The medical multi-laser amplifying output device 1 according to the present embodiment is a device having a plurality of laser rods that are sequentially pumped, and combining the outputs of each laser bar with a single pulse laser for output.

When pumping and outputting one laser rod at a high repetition rate, the system requires high cooling efficiency. On the other hand, when a plurality of laser rods are used, the repetition rate of pumping and outputting each cavity may be reduced, and thermal accumulation may be reduced compared to a single cavity system, so temperature control may be possible with an air/water cooling system. In the present embodiment, the optical resonator 10 is composed of multi-channels that implement a plurality of laser cavities 101 for optical resonance.

The output laser of the optical resonator 10 is the sum of the laser rod outputs in the laser cavity 101, and the speed of the output pulse and the average energy level are high. In this embodiment, the laser cavity 101 is composed of four, Ho:YAG laser rod may be used. Each laser cavity 101 is pulsed at 10 Hz, and the four cavity 101 outputs are combined and interleaved into a single output laser. The interleaved output laser has a pulse frequency of 40 Hz.

2 shows an optical resonator 10 according to an embodiment of the present invention. Referring to FIG. 2, the optical resonator unit 10 guides a plurality of laser cavities 101 and light sequentially output by the plurality of laser cavities 101 in a single path to form a

single output laser

103 , 105, 107, 109).

The plurality of laser cavities 101 are fixed to the fourth quadrant. The first laser cavity 101(a) and the second laser cavity 101(b) are a pair of laser cavities arranged on the same x-axis. The third laser cavity 101(c) and the fourth laser cavity 101(d) are also a pair of laser cavities arranged on the same x-axis. The first laser cavity 101(a) and the third laser cavity 101(c), the second laser cavity 101(b) and the fourth laser cavity 101(d) are each on the same y-axis. Is placed. The laser cavity 101 may be provided with a gain medium for laser excitation and an optical pump.

The first to fourth laser cavities 101(a), 101(b), 101(c), and 101(d) are sequentially pumped to oscillate the laser. In this embodiment, the first to fourth laser cavities 101(a), 101(b), 101(c), 101(d) are pulsed at 10 Hz, respectively. The lasers sequentially output from the first to fourth laser cavities 101(a), 101(b), 101(c), and 101(d) at a pulse frequency of 10 Hz are

optical systems

103, 105, 107, and 109. Through, they are combined into a single laser, and the pulse frequency of the output laser is amplified to 40 Hz.

Figure 3 shows the optical system (103, 105, 107, 109) according to an embodiment of the present invention. Referring to FIG. 3, the

optical systems

103, 105, 107, and 109 may include a plurality of reflector mirrors 103, a plurality of relay mirrors 105, and a servo mirror 107. 3 shows an optical path of a laser output from one laser cavity 101 together.

The reflector mirror 103 may be amplified by resonating the output laser of the laser cavity 101 with a reflector disposed before and after the laser cavity 101. The reflector mirror 103 includes a rear reflector mirror 103(b) located at the rear of the laser cavity 101 and a front reflector mirror 103(a) located at the front of the laser cavity 101.

The front reflector mirror 103(a) and the rear reflector mirror 103(b) are optical systems that configure a resonator to oscillate a laser, and are configured to determine a resonance system. The front reflector mirror 103(a) is partially reflective coated to resonate some of the output lasers of the laser cavity 101, and to output some of them. On the other hand, the rear reflector mirror 103(b) is coated with a front reflection. The front reflector mirror 103(a) and the rear reflector mirror 103(b) are provided for each pair of laser cavities 101. In this embodiment, the optical resonator 10 includes first to fourth laser cavities 101(a), 101(b), 101(c), and 101(d), so that the reflector mirror 103 A total of eight are arranged in four laser cavities 101(a), 101(b), 101(c), and 101(d) with one pair of front-rear.

In this embodiment, the rear reflector mirror 103(b) has a negative curvature surface, and the front reflector mirror 103(a) is configured to have a flat surface. The curvature of the front reflector mirror 103(a) and the rear reflector mirror 103(b) is closely related to the output of the resonant laser. In the prior art, the configuration corresponding to the rear reflector mirror 103(b) of the present embodiment has been disclosed as a high reflector mirror in FIG. 1 of U.S. Patent No.9939631 described above, and corresponds to the front reflector mirror 103(a) The configuration to be started was described as an output coupler (partial reflector). In FIG. 1 of U.S. Patent No. 9939631, the high reflector mirror has a flat surface and the output coupler (partial reflector) has a concave surface. Note that this is in contrast to Figure 3 of the Examples.

In the optical system according to the present embodiment, the rear reflector mirror 103(b) of total reflection is configured as a concave surface to minimize the divergence angle of the resonant laser. Accordingly, it is designed to advantageously enter the optical fiber of the output line. Further, the front reflector mirror 103(a) has a flat mirror surface. If the surface of the front reflector mirror 103(a) is concave, the divergence angle increases when the laser is emitted, which may cause more technical difficulties in adjusting the incident of the optical fiber.

The plurality of relay mirrors 105 collectively refers to a configuration of an optical system that transmits a laser oscillated from the reflector mirror 103 to the servo mirror 107 and transmits light incident on the servo mirror 107 to the output line. In this embodiment, as shown in FIG. 3, the plurality of relay mirrors 105 are first relay mirrors 105(a) through which an oscillation laser of the front reflector mirror 103(a) is directly incident and reflected at a predetermined angle. ). The first relay mirror 105(a) is disposed coaxially with the front reflector mirror 103(a). In this embodiment, the first relay mirror 105(a) may be configured as a concave surface to minimize the divergence of the laser.

In addition, the plurality of relay mirrors 105 includes a second relay mirror 105(b) that causes the laser reflected from the first relay mirror 105(a) to enter the servo mirror 107. In addition, the plurality of relay mirrors 105 includes a third relay mirror 105(c) that causes the laser reflected from the servo mirror 107 to enter the output line. Both the first relay mirror 105(a) and the second relay mirror 105(b) are disposed in the laser cavity 101, one pair each. In the third relay mirror 107, the paths of the lasers sequentially output from the first to fourth laser cavities 101(a), 101(b), 101(c), and 101(d) are servo mirrors 107 Since it was unified by ), only one can be disposed in the optical system.

The servo mirror 107 may rotate under the control of the processor unit 30 and focus light output from each laser cavity 101 in a single path of the output line. The servo mirror 107 is a reflector that is rotated 360°, and a servo motor that rotates the servo mirror 107 and an encoder that controls the rotation angle of the mirror 107 may be modularized together. The servo mirror 107 is rotated to reflect the sequential laser outputs of the four laser cavities 101(a), 101(b), 101(c), 101(d) in a single path. Therefore, the rotation angle of the servo mirror 107 is adjusted in the range of 90° for each laser cavity 101(a), 101(b), 101(c), 101(d).

After the sequential laser output is integrated into a single path through the servo mirror 107, an optical path is formed through the third relay mirror 105(c) to the output line of the optical resonator 10 where the optical fiber is provided. . In FIG. 3, the optical system of the output line is collectively designated by reference numeral 109. A plurality of reflection mirrors may be additionally provided in the optical system 109 of the output line according to the characteristics of the arrangement and design of the optical fiber.

4 shows a control driving state of the servo mirror 107 according to an embodiment of the present invention and an optical path accordingly. FIG. 4A shows the first laser cavity 101(a) among the four laser cavities 101(a), 101(b), 101(c), and 101(d) according to the present embodiment. Optical path. FIG. 4B shows the second laser cavity 101(b) among the four laser cavities 101(a), 101(b), 101(c), and 101(d), according to the present embodiment. Optical path.

The optical path of the optical resonator 10 according to this embodiment is summarized as follows. The laser rod of the laser cavity 101 is excited, and the outputted laser oscillates through the front reflector mirror 103(a) and the rear reflector mirror 103(b). The pumped laser is a front reflector mirror (103(a))-a first relay mirror (105(a))-a second relay mirror (105(b))-a servo mirror 107-a third relay mirror (105(c) )) to the optical system 109 of the output line. In this case, the optical resonator 10 is formed with a considerable distance of the optical path of the laser to the optical fiber of the output line. Due to the nature of the laser, it is required to minimize the divergence of the laser because the size of the laser increases when relaying a long distance. The key is to minimize the divergence of the laser and focus the output laser on the center point of the servo mirror 107. In this process, the optical resonator unit 10 according to the present embodiment configures the front reflector mirror 103(a) as a flat surface, and configures the first relay mirror 105(a) as a concave surface.

5 shows a cooling unit 50 according to an embodiment of the present invention. The multi-laser amplifying output device 1 according to the present embodiment has been described above as a Holmium Yag (Ho:YAG) laser that needs to be maintained at a relatively low temperature. The cooling system of the multi-laser amplifying output device 1 can be one of the main technical challenges to improve the overall laser output. Therefore, a cooling unit 50 system is provided in a configuration for cooling the heat generated by the optical resonator unit 10 generated in the pumping process. The cooling unit 50 includes a temperature sensor to control the temperature of the optical resonance unit 10.

The cooling unit 50 includes a cooling pump 51, a cavity cooling line 52, a filter 53, a branch line 54, a radiator 55, a cooling tank 57, a supply line 58, and a fan ( 59).

The cooling pump 51 is connected to the optical resonator 10 to supply cooling water. The cooling pump 51 is connected to the cooling tank 57 through a supply line 58. Cooling water from the cooling tank 57 flows into the cooling pump 51, and the cooling pump 51 flows the cooling water through the cavity cooling line 52 into the optical resonator 10, and the optical resonator 10 is constant. Controlled by temperature. The cavity cooling line 52 may include one or more filters 53. In this embodiment, the filter 53 may include a micro filter 53(a) and a DI filter 53(b).

The radiator 55 is composed of vertical pillar folds. The radiator 55 forms a circulation path of the cooling water therein and discharges heat energy of the cooling water to the outside during the circulation process of the cooling water. A fan 59 is disposed on the rear of the radiator 55 to increase the cooling efficiency of the radiator 55.

The radiator 55 has a line through which a supply line connected to the optical resonator 10 of the cooling pump 51 branches, and a portion of cooling water supplied to the optical resonator 10 flows in. The configuration in which a part of the cooling water supplied to the optical resonator 10 is branched into a line flowing into the radiator 55 is referred to as a branching line 54.

The branch line 54 is formed in the cavity cooling line 52. The branch line 54 is connected to the radiator 55. Cooling water is introduced into the radiator 55 through the branch line 54 to release heat energy. Note that in this embodiment, the inflow path of the radiator 55 is a branch line 54 branched from the cavity cooling line 52. In general, it is common for a line of coolant discharged by circulating the optical resonator 10 to flow into the radiator 55. However, in this embodiment, the line of cooling water discharged by circulating the optical resonator 10 is connected to the cooling tank 57. That is, the cavity cooling line 52 is connected to the cooling tank 57 via the optical resonator 10.

The multi-laser amplification output device 1 is required to be controlled in a certain range by minimizing the displacement of temperature. In the present embodiment, the cooling water whose temperature has increased through the optical resonator 10 is collected into the cooling tank 57 through the cavity cooling line 52. As a large amount of cooling water having a high temperature is accommodated on the cooling tank 57, the displacement of the temperature is lowered and the temperature value of the cooling water becomes constant. Here, it is noted that the cooling water whose temperature is lowered through the radiator 55 also flows into the cooling tank 57. That is, in the cooling unit 50 system as in the present embodiment, the radiator 55 not only lowers the temperature of the cooling water, but also the cooling tank 57 also lowers the temperature of the cooling water and equalizes the temperature value.

6 shows a cooling water circulation path of the cooling unit 50 according to an embodiment of the present invention. Referring to FIG. 6, the cooling unit 50 according to an embodiment of the present invention is divided into a cooling water path of C1 and a cooling water path of C2.

The cooling water path of C1 flows through the cooling water from the cooling tank 57 through the cooling pump 51 and the cavity cooling line 52 sequentially to the optical resonator 10. The cooling water path of C2 flows into the radiator 55 through the branch line 54 in which the cavity cooling line 52 supplied from the cooling pump 51 to the optical resonator 10 is branched. Cooling water circulated through the radiator 55 flows into the cooling tank 57 again. The path of C1 is a path for cooling the laser of the optical resonator 10, and the path of C2 is a path for cooling the cooling water. In the cooling unit 50 system according to the present embodiment, a path discharged from the cooling tank 57 to the cooling pump 51 is common. Accordingly, the laser is cooled on the cooling tank 57 to be combined with the cooling water having a high temperature and the cooled cooling water, and the temperature is evenly leveled to enable more stable temperature control.

7 shows a control screen of the processor unit 30 according to an embodiment of the present invention. The control screen of the processor unit 30 according to FIG. 7 may be displayed through the display unit 70. The display unit 70 is provided as a control panel, and can change the operating conditions of the processor unit 30 or display the operation status of the equipment.

Referring to FIG. 7, the display unit 70 includes a status window (READY), a guide beam UI (PILOT), an information button (i), a system power button, a frequency control UI (FREQUENCY), an energy control UI (ENERGY), and power A status window (POWER), an offset parameter load UI (DEFAULT) of the equipment, a main alarm UI (FIBER, SAFETY GLASS, LAMP, TEMP), a temperature display (TEMP), and other alarm and equipment information windows may be provided.

The status window (READY) provides a function that can be switched between standby and ready mode to provide safe eye laser output operation. In ready mode, the laser is emitted when the user presses a separate foot switch. The guide beam UI (PILOT) can adjust the brightness of the guide beam of the laser output path. It is possible to adjust the brightness of the guide beam hard or weak by touching or dragging. The information button (i) provides information such as S/N of the system, lamp usage, time, and manufacturing date. The system power button can display a button operation sequence or an image together to safely shut down the device.

The frequency control UI (FREQUENCY) allows you to set the number of shots per second of the laser. The user can set the pulse frequency of the output laser by operating the buttons (+) and (-). In the present embodiment, indicated as 40 Hz, the frequency of the output laser is 40 Hz, where the four laser cavities 101 (a), 101 (b), 101 (c), and 101 (d) each output a laser of 10 Hz. do. The energy control UI (ENERGY) allows the energy of the output laser to be set. The power status window (POWER) displays the power (Frequency x Energy) set by the frequency control UI (FREQUENCY) and the energy control UI (ENERGY). The main alarm UI (FIBER, SAFETY GLASS, LAMP, TEMP) displays the status of major alarms that the user needs to know. The temperature display (TEMP) displays the current instrument temperature.

Loading the offset parameter of the device UI (DEFAULT) loads the set parameter of the device that is offset. The offset parameter can be set by selecting the administrator mode on the display unit 70.

The processor unit 30 controls the optical resonator unit 10 by determining energy to excite the medium of the laser cavity 101. In the process of controlling the initial pulse of the laser cavity 101, the processor unit 30 applies an offset signal that gradually increases in pulse width to fix the pulse width of the offset signal when reaching the set output value of the laser cavity 101. The offset of the optical resonator 10 can be adjusted. When the offset signal is applied, the processor unit 30 may gradually increase the pulse width of the offset signal while the voltage of the offset signal is fixed.

Referring to Figure 8a, the conventional offset control is set to output a predetermined output value of the laser by applying an offset signal having a constant pulse width (for example, 600 ㎲). In theory, it is assumed that the pulse width of the offset signal for outputting the laser output 1J is 600 Hz. Here, when the offset signal is applied, an overshooting value exceeding 1J exists as a laser pumping process, and the output value converges to 1J through a stabilization period. However, the laser is an extremely sensitive device and cannot accurately derive the theoretical value of the offset setting due to hardware characteristics, temperature of the installed place, and the like. In the example of FIG. 8A, in some cases, the laser power may exceed 1J and may not reach 1J.

Accordingly, the processor unit 30 according to the present embodiment applies an offset signal having a variable pulse width as shown in FIG. 8B. Here, the voltage value of the offset signal is fixed. The offset signal applied by the processor unit 30 has the shortest pulse width of the initial signal, and the pulse width increases as time passes. The processor unit 30 checks the energy of the output laser and subsequently determines an offset signal having a pulse width at that time when it reaches a set value (for example, 1J).

As a result of the processor 30 performing the offset control process in the above-described form, the initial energy is stabilized, and the system is prevented from being damaged by excessive overshoot even in the output stabilization section. In the offset process, the user can set an initial pulse width of the offset signal and an increase amount of the pulse width at the start.

9 shows a sequence control principle of the processor unit 30 according to an embodiment of the present invention. 9 shows the operation signals of the four laser cavities 101(a), 101(b), 101(c), and 101(d) controlled by the processor unit 30 as time (x-axis) lines. The processor unit 30 sequentially from the operation signal of the first laser cavity 101(a), the second laser cavity 101(b), the third laser cavity 101(c), and the fourth laser cavity ( 101(d)).

At this time, the processor unit 30, each of the laser cavity (101 (a), 101 (b), 101 (c), 101 (d)) of any one of the laser cavity (101 (b)) when an error occurs, The optical resonator 10 so as to ensure the continuity of the output by instructing to skip the order of the output of the laser cavity 101(b) in which the error occurred in the sequence, and to skip the order to the next laser cavity 101(c) Can be controlled.

In FIG. 9, when the life of the flash lamp of the second laser cavity 101(b) has expired, or an abnormality has occurred in the optical system disposed in the second laser cavity 101(b), the laser reaches the output line Otherwise, the laser output value different from the setting is displayed. At this time, the processor unit 30 detects an error of the second laser cavity 101(b). When the above error signal is detected, the processor unit 30 omits the operation signal of the second laser cavity 101(b). Also, the processor unit 30 outputs the output sequence to the first laser cavity 101(a)-the second laser cavity 101(b)-the third laser cavity 101(c)-the fourth laser cavity 101 In (d)), the first laser cavity 101(a)-third laser cavity 101(c)-fourth laser cavity 101(d) is changed, and the sequence at this time is stored, Continuous control is performed in the above order.

By changing the sequence of the processor unit 30, although the output laser has a smaller power than the conventional one, the operation time may be extended, but at least the continuity of the output is maintained, so that it is possible to systematically prevent medical accidents that may occur. There will be.

Although the present invention has been described in detail through exemplary embodiments above, those skilled in the art to which the present invention pertains understand that various modifications are possible within the limits of the embodiments described above without departing from the scope of the present invention. will be. Therefore, the scope of rights of the present invention should not be limited to the described embodiments, but should be determined by all modified or modified forms derived from the claims and equivalent concepts as well as the claims described below.

[Description of codes]

1: Multi laser amplification output device

10: optical resonator

101: laser cavity

103: reflector mirror

105: relay mirror

107: servo mirror

109: output line optical system

30: processor unit

50: cooling unit

51: cooling pump

52: cavity cooling line

53: filter

54: branch line

55: Radiator

57: cooling tank

59: fan

70: display unit

Claims

In the medical multi-laser amplification output device,

An optical resonator composed of a plurality of laser cavities and an optical system that guides the lasers sequentially output by the plurality of laser cavities in a single path to form a single output laser;

A processor unit configured to control the optical resonance unit by determining energy to excite the medium of the laser cavity; And

It includes a cooling unit for controlling the temperature of the optical resonance unit,

The processor unit,

In the process of controlling the initial pulse of the laser cavity, adjusting the offset of the optical resonator by fixing the pulse width of the offset signal when a preset output value of the laser cavity is reached by applying an offset signal whose pulse width gradually increases. Medical multi-laser amplification output device characterized by.
According to claim 1,

The processor unit,

When applying the offset signal, a medical multi-laser amplification output device, characterized in that the pulse width of the offset signal is gradually increased while the voltage of the offset signal is fixed.
According to claim 1,

The optical system,

In each of the above laser cavities,

A pair of reflector mirrors provided before and after the laser cavity; And

It includes a relay mirror for focusing the light output through the pair of reflector mirrors,

Further comprising a servo mirror to guide the light reflected from each of the relay mirror provided in each of the laser cavity to the output line,

The servo mirror,

While rotating under the control of the processor unit, each laser cavity sequentially outputs light to focus on a single path of the output line,

The reflector mirror,

Medical multi-laser amplification output device, characterized in that the rear reflector mirror located on the rear surface of the laser cavity has a negative curvature surface, and the front reflector mirror located on the front surface of the laser cavity has a flat surface.
According to claim 1,

The processor unit,

When an error occurs in any one of the above laser cavities,

A multi-amplification medical output device for medical use, characterized in that the optical resonator is controlled to ensure the continuity of the output by excluding the output sequence of the laser cavity in which an error occurs in a sequence, and then skipping the sequence to the next laser cavity.
According to claim 1,

The cooling unit,

A cooling pump connected to the optical resonance unit and supplying cooling water; And

A medical multi-laser amplifying output device including a radiator having a line in which a supply line connected to the optical resonator of the cooling pump is branched and a portion of cooling water supplied to the optical resonator is introduced.
In the medical multi-laser amplification output device,

An optical resonator composed of a plurality of laser cavities and an optical system that guides light sequentially output from the plurality of laser cavities in a single path to form a single output laser;

A processor unit configured to control the optical resonance unit by determining energy to excite the medium of the laser cavity; And

It includes a cooling unit for controlling the temperature of the optical resonance unit,

The processor unit,

When an error occurs in any one of the above laser cavities,

A multi-amplification medical output device for medical use, characterized in that the optical resonator is controlled to ensure the continuity of the output by excluding the output sequence of the laser cavity in which an error occurs in a sequence, and then skipping the sequence to the next laser cavity.