CN212725947U

CN212725947U - Novel thulium laser medical treatment device

Info

Publication number: CN212725947U
Application number: CN202021793930.4U
Authority: CN
Inventors: 李胜同; 王秀时
Original assignee: Individual
Current assignee: Cheng Renbin; Dong Qiao
Priority date: 2020-08-25
Filing date: 2020-08-25
Publication date: 2021-03-16
Anticipated expiration: 2030-08-25

Abstract

The utility model provides a novel thulium laser medical treatment device, including laser resonator, focusing mirror and optical coupler, including high mirror and output mirror in the laser resonator high mirror with be equipped with the pumping source between the output mirror and mix thulium ion laser crystal. The utility model discloses both can produce accurate continuous thulium laser and also can produce pulse thulium laser, accurate continuous thulium laser is used for the excision of soft tissue gasification, and pulse thulium laser is used for internal rubble. The utility model discloses a tractor serves several purposes improves clinical availability factor, practices thrift the operation cost, this device simple structure, safety control, wide and convenient to use of adaptability.

Description

Novel thulium laser medical treatment device

Technical Field

The utility model belongs to the technical field of laser therapy device, especially, relate to a novel thulium laser medical treatment device.

Background

The thulium laser medical equipment has good application prospect in the aspect of treating soft tissues such as prostate and the like, and in-vivo broken stones and other diseases. The high-energy holmium laser medical equipment is widely applied to laser lithotripsy, but the holmium laser medical equipment with high average power is easy to form fissile damage when prostate tissues are gasified and easy to bleed during operation, and the high-average power laser is limited by a radiation pump source device, so that the working repetition frequency is low, the operation cutting speed is reduced, and the holmium laser medical equipment is not suitable for gasification cutting of soft tissues.

The high-average-power thulium laser medical equipment has the advantages that the wavelength is just near the absorption peak of water molecules of a human body, the speed of cutting soft tissues such as prostate and the like is high, the hemostatic effect is good, and the operation difficulty is reduced. However, the wavelength of the existing high-average-power solid thulium laser medical equipment is 2013nm, and the existing high-average-power solid thulium laser medical equipment is continuous laser and has poor effect on in-vivo lithotripsy.

The technical scheme that a continuous wave 785nm semiconductor laser pump is utilized to pump thulium ion doped Tm, YAG laser crystals generate a thulium laser source with high average power in an optical resonant cavity is mainly that the wavelength is 2013nm and the output power is 100W grade, but after the obtained pulse laser is output by adopting the structural scheme and combining a Q adjusting technology, the single pulse energy is low and the in-vivo lithotripsy effect is poor.

SUMMERY OF THE UTILITY MODEL

The utility model provides a novel thulium laser medical treatment device, the technical problem that bleeds easily, the monopulse energy is on the low side, the internal rubble is poor effect when having solved among the prior art operation.

In order to solve the technical problem, the utility model discloses a technical scheme is:

the utility model provides a novel thulium laser medical treatment device, includes laser resonator, focusing mirror and optical coupler, including high mirror and output mirror in the laser resonator high mirror with be equipped with the pumping source between the output mirror and mix thulium ion laser crystal.

Further, the thulium ion doped laser crystal is Tm: YAP crystals.

Further, the pump source comprises an odd number of QCW semiconductor lasers, and the wavelength of the QCW semiconductor lasers is 793nm or 777 nm.

Further, the high-reflection mirror and the output mirror form the laser resonant cavity with a flat cavity structure.

Further, the QCW semiconductor laser is along mix thulium ion laser crystal periphery evenly spaced arrangement and form the pumping source.

Further, the output wavelength of the quasi-continuous thulium laser and the pulse thulium laser generated by the laser resonant cavity is 1940nm or 1980 nm.

The optical resonant cavity in the technical scheme selectively works in a quasi-continuous operation mode or a pulse operation mode; when the optical resonant cavity works in a quasi-continuous operation mode, the thulium laser medical device realizes high-average-power quasi-continuous laser output, has the repetition frequency of 500-2000Hz, and is used for soft tissue gasification and ablation; when the optical resonant cavity works in a pulse operation mode, the thulium laser medical device realizes large-energy pulse laser output, has a repetition frequency of 10-500Hz and is used for crushing stones in a body; the two functions can be realized by switching each other.

When the optical resonant cavity is in a pulse operation mode, the pulse laser adopts a mixing modulation mode, a mixing pulse sequence is composed of a plurality of sub-pulses, and the width, the amplitude and the interval of each sub-pulse can be programmed.

Compared with the prior art, the thulium laser medical device of the utility model has the advantages that the laser with the wavelength of 1940nm is closer to the absorption peak value of water, and the absorption of water can reach 2.5 times of the laser with the wavelength of 2013nm used in the prior art; compared with the traditional thulium laser equipment with the wavelength of 2013nm, the thulium laser equipment has the advantages of better in-vivo lithotripsy function and soft tissue gasification excision effect, difficulty in bleeding during operation, high single pulse energy, good in-vivo lithotripsy effect, good treatment effect, high treatment efficiency and operation cost saving. The device has the advantages of simple structure, safety control, wide applicability and convenient use.

Drawings

Fig. 1 is a schematic structural diagram of a solid-state laser according to an embodiment of the present invention;

fig. 2 is a schematic diagram of the positions of three pump sources and a laser crystal according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a mixing mode according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a solid-state laser according to another embodiment of the present invention.

In the figure:

10. high-reflection mirror 20, output mirror 30 and thulium-doped ion laser crystal

40. Pump source 41, QCW semiconductor laser 50, laser resonant cavity

60. Focusing mirror 70, coupler

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

The present embodiment provides a novel thulium laser medical device, as shown in fig. 1, which includes a laser resonator 50, a focusing mirror 60 and an optical coupler 70, wherein the laser resonator 50 includes a high-reflectivity mirror 10 and an output mirror 20, and a pumping source 40 and a thulium-doped ion laser crystal 30 are disposed between the high-reflectivity mirror 10 and the output mirror 20; the focusing mirror 60 and the coupler 70 are sequentially disposed at one end of the laser resonator 50 close to the output mirror 20, and the focusing mirror 60 is disposed close to one side of the output mirror 20. The thulium ion doped laser crystal 30 is Tm: YAP crystal, and rod-like structure.

The pump source 40 comprises an odd number of QCW semiconductor lasers 41, the QCW semiconductor lasers 41 having a wavelength of 793nm or 777 nm. The high reflection mirror 10 and the output mirror 20 form the laser resonator of a flat cavity structure. The QCW semiconductor lasers 41 are arranged at regular intervals along the periphery of the thulium ion doped laser crystal 30 to form the pump sources 40. The output wavelengths of the quasi-continuous thulium laser and the pulse thulium laser generated by the laser resonant cavity 50 are 1940nm or 1980 nm. The optical cavity 50 is selectively operated in a quasi-continuous mode of operation or a pulsed mode of operation; when the optical resonant cavity 50 is in a quasi-continuous operation mode, quasi-continuous laser output with high average power can be realized, the repetition frequency is 500-2000Hz, and the quasi-continuous laser output is used for soft tissue gasification and ablation; when the optical resonant cavity works in a pulse operation mode, the repetition frequency is 10-500Hz, and the high-energy pulse laser output can be realized for in vivo lithotripsy; the two functions can be realized by switching each other.

Specifically, as shown in FIG. 1, the high reflection mirror 10 is coated with a 1940nm wavelength total reflection film, and the reflectivity R is more than 99%; the output mirror 20 is coated with a 1940nm wavelength partially reflective film, and the reflectivity R is 90%. The laser resonator 50 further comprises a pump source 40 consisting of 3 QCW semiconductor lasers 41 with a wavelength of 793nm and a thulium ion doped laser crystal 30. When the optical resonant cavity works in a quasi-continuous operation mode, quasi-continuous laser with high average power can be output for soft tissue gasification and ablation; when the optical resonant cavity works in a pulse operation mode, high-energy pulse laser can be output and used for crushing stones in a body; the two functions can be realized by switching each other.

As shown in fig. 2, no matter how the structures of the thulium-doped laser crystal 30 and the pumping source 40 in the laser resonator 50 are arranged, the pumping source 40 includes odd number of QCW semiconductor lasers 41 with a wavelength of 793nm, the QCW semiconductor lasers 41 are uniformly spaced along the periphery of the thulium-doped ion laser crystal 30 to form the pumping source, and the generated quasi-continuous thulium laser or pulse thulium laser is output after being processed by the focusing mirror 60 and the coupler 70 in sequence. In the present embodiment, the selective pump source 40 includes three QCW semiconductor lasers 41.

In this embodiment, the pumping mode of the pump source 40 is side pumping. That is, the pump source 40 adopts the QCW semiconductor laser 41 with the wavelength of 793nm or 777nm, so that the wavelengths of the quasi-continuous thulium laser and the pulse thulium laser generated by the laser resonant cavity 50 are 1940nm or 1980nm, the wavelength of the frequency band is closer to the absorption peak value of water, and the absorption of the water can reach 2.5 times that of the 2013nm thulium laser used in the prior art; and the quasi-continuous thulium laser and pulse thulium laser medical device with the wavelength band of 1940nm or 1980nm has better functions of gasifying and cutting the internal broken stone and soft tissue. The high average power output can be realized during quasi-continuous operation, and the device is suitable for soft tissue gasification and resection; when the pulse operation mode is adopted, a mixing modulation mode is adopted, namely the generated pulse thulium laser is pulse sequence laser in the mixing modulation mode, and at the moment, high peak power and high energy pulse laser output is realized, so that the in-vivo lithotripsy effect can be improved; the single device has two functions, can be switched and realized, and has shorter operation time.

Furthermore, the traditional thulium laser is output by continuous laser, the common power of the traditional thulium laser is 100W grade, the traditional thulium laser is mainly used for the gasification and excision of soft tissues such as prostatic hyperplasia bladder tumor and the like in clinic, and the traditional thulium laser does not have the function of crushing stones. As shown in fig. 3, the waveform of the pulsed thulium laser in this embodiment is a mixed modulation type pulse sequence, each pulse sequence is composed of several sub-pulses, and the width, amplitude, and interval of each sub-pulse can be programmed. The high peak power of the sub-pulse laser is ensured, the large energy of the pulse sequence can be realized, and the stone breaking effect can be effectively improved.

As shown in fig. 4, a solid-state laser structure according to another embodiment is shown, that is, two sets of pumping sources 40 and thulium-doped ion laser crystals 30 are disposed in a laser resonant cavity 50, and both the two sets of thulium-doped laser crystals 30 and the pumping sources 40 are in a serial structure.

In this embodiment, the thulium-doped ion laser crystal 30 is Tm: YAP crystal, the wavelength of the pump source 40 is 793nm, and the peak power of the pump source is 7200W. When the laser resonant cavity operates in a quasi-continuous mode, the laser resonant cavity 50 generates quasi-continuous thulium laser, the average power can reach 100W grade, the repetition frequency is 500-2000Hz, the peak power is far higher than the average power, and the quasi-continuous thulium laser is more suitable for soft tissue gasification excision and blood coagulation effects than the continuous thulium laser.

When the pulse thulium laser adopts the traditional uniform pulse mode, the pulse width is 0.5ms, the peak power of the pulse laser is 300W, and the single pulse energy is 0.15J.

When the pulse thulium laser adopts the mixing modulation type pulse mode described in this embodiment, each pulse sequence has 20 sub-pulses, the pulse sequence width is 2ms, the pulse width of the sub-pulse is 0.05ms, the peak power of a single sub-pulse laser can be increased to 500W, the energy of a single sub-pulse is 0.025J, and the pulse energy of the pulse sequence is 0.5J. The high peak power of the pulse thulium laser is realized, the high energy of a pulse sequence is ensured, the stone breaking efficiency can be greatly improved, and the performance of the pulse thulium laser is superior to that of the uniform pulse thulium laser.

The utility model relates to a novel thulium laser medical treatment device both possesses soft tissue gasification excision function, also possesses internal rubble function. A single device realizes two functions, and the two functions are switched at any time according to clinical needs. The quasi-continuous thulium laser has a faster soft tissue gasification ablation effect than the continuous thulium laser, and the operation time is shorter; the pulse thulium laser output in a mixing modulation pulse mode has the characteristics of high peak power and high pulse energy, and can greatly improve the stone breaking efficiency; the utility model discloses the wavelength of the accurate continuous thulium laser of production and pulse thulium laser is 1940nm or 1980nm, and the wavelength of this frequency channel is more close the absorption peak value of water, and the absorption of water can reach that the wavelength that uses among the prior art is 2.5 times of 2013nm thulium laser, and is better, internal rubble efficiency is higher to the gasification excision effect of soft tissue, and the operation time is shorter, has practiced thrift the operation cost. The device has the advantages of simple structure, safety control, wide applicability and convenient use.

The embodiments of the present invention have been described in detail, and the description is only for the preferred embodiments of the present invention, and should not be construed as limiting the scope of the present invention. All the equivalent changes and improvements made according to the application scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. The utility model provides a novel thulium laser medical treatment device, its characterized in that, includes laser resonator, focusing mirror and optical coupler, including high mirror and output mirror in the laser resonator high mirror with be equipped with the pumping source between the output mirror and mix thulium ion laser crystal.

2. The novel thulium laser medical device according to claim 1, wherein the thulium doped ion laser crystal is Tm: YAP crystals.

3. A novel thulium lasing medical device according to claim 1 or 2, wherein the pump source comprises an odd number of QCW semiconductor lasers having a wavelength of 793nm or 777 nm.

4. A novel thulium laser medical device according to claim 3, wherein the high reflection mirror and the output mirror form the laser resonator in a flat cavity configuration.

5. The novel thulium laser medical device as claimed in claim 4, wherein the QCW semiconductor lasers are uniformly spaced along the periphery of the thulium doped ion laser crystal to form the pump source.

6. A novel thulium-lasing medical device as claimed in any of claims 1-2 and 4-5 wherein the quasi-continuous thulium laser and pulsed thulium laser generated by the laser cavity have output wavelengths of 1940nm or 1980 nm.