A super-pulsed solid-state thulium laser

Abstract

A super-pulsed solid-state thulium laser comprises a resonant cavity, one end of which is closed and the other end is connected to a coupler. A high-reflection mirror, an acousto-optic Q-switch, a thulium rod, a high-power lens, and a focusing mirror are coaxially mounted within the resonant cavity. A LD (light-dispersed laser) semiconductor palladium bar is mounted on the periphery of the thulium rod, projecting light onto the rod. Both the thulium rod and the LD (light-dispersed laser) are connected to a power supply. The acousto-optic Q-switch is mounted on one end of the thulium rod, while a high-power lens, a focusing mirror, and a coupler are mounted on the other end of the rod. The high-reflection mirror is mounted on the other end of the acousto-optic Q-switch. This laser, with the thulium rod and the LD (light-dispersed laser) semiconductor palladium bar jointly emitting light, is amplified by the resonant cavity to produce a laser with output power several tens of times higher than the output power. This laser significantly outperforms existing pulsed holmium lasers in terms of increasing pulse frequency, pulse peak value, and tissue absorption rate.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, in particular to a laser surgical device, and in particular to an ultra-pulsed solid-state thulium laser. Background Art

[0002] Lasers are widely used in defense, medical and biological research, especially in medical equipment such as laser cutting and lithotripsy. Current lasers mostly use pulsed holmium lasers for surgical cutting and lithotripsy, but the maximum frequency of pulsed holmium lasers is only 80HZ, and the pulse peak value and tissue absorption rate are relatively low, which will directly lead to: 1. Low pulse frequency, prolonged operation time; 2. Low pulse peak power, resulting in the inability to completely crush hard or large stones; 3. Low tissue absorption rate leads to increased power consumption, high energy consumption and poor surgical results.

[0003] After searching the published patents, the following patent documents were found to be most relevant to this technical solution:

[0004] 1940nm thulium-doped all-fiber laser and medical device based on the laser (CN109950781A) disclose a 1940nm thulium-doped all-fiber laser and a medical device based on the laser, relating to the field of optical fiber medical technology. To solve the problems of poor 2μm wavelength effect, low output power, large size, poor stability and poor heat dissipation of existing devices, the laser includes a semiconductor laser, a beam combiner, a high-reflection grating, two sections of thulium-doped optical fiber, a low-reflection grating, a reverse beam combiner, a reverse pump laser, a cladding light stripper, a first optical fiber output head, an optical fiber water cooling plate and a refrigerant cooling device. Through a good cooling and heat dissipation structure and high-quality optical fiber fusion technology, a high-power laser output of 300W is achieved; the medical device includes the above-mentioned laser, as well as a driving device, a power conversion module, a second optical fiber output head, an optical fiber coupling connection device and a medical optical fiber. Direct coupling is adopted between the laser and the medical optical fiber to achieve a higher coupling efficiency; the invention is used for lithotripsy and tissue cutting in medical treatment.

[0005] Through comparative analysis of the above-mentioned patent documents, the applicant believes that the light source generation method and the optical resonant cavity enlargement method of the patent are different. After analysis, the above-mentioned patent does not affect the novelty of this application. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a super-pulsed solid-state thulium laser. The laser is composed of a thulium rod and an LD semiconductor palladium bar that jointly emit a light source. The light source is amplified by a resonant cavity to form a laser with an output power several dozen times higher than that of the laser. The laser is significantly superior to the pulsed holmium laser in the existing technology in terms of improving the pulse frequency, pulse peak value and tissue absorption rate.

[0007] A super-pulsed solid-state thulium laser comprises a resonant cavity, one end of which is closed and the other end is connected to a coupler; a high-reflection mirror, an acousto-optic Q-switch, a thulium rod, a high-power lens and a focusing mirror are coaxially fixedly installed in the resonant cavity, wherein an LD semiconductor palladium bar is installed on the periphery of the thulium rod for projecting a light source onto the thulium rod, and both the thulium rod and the LD semiconductor palladium bar are connected to a power supply; the acousto-optic Q-switch is installed on one end of the thulium rod, and the high-power lens, the focusing mirror and the coupler are installed on the other end of the thulium rod; and the high-reflection mirror is installed on the other end of the acousto-optic Q-switch.

[0008] Moreover, both ends of the thulium rod are fixedly supported by brackets, and the brackets, the acousto-optic Q-switch, the high-reflection mirror, the high-reflection lens and the focusing mirror are all fixedly connected to the inner wall of the resonant cavity.

[0009] Moreover, the power supply converts 220V AC into 36V DC and passes it to the thulium rod and LD semiconductor palladium bar.

[0010] Moreover, when the LD semiconductor palladium bar is energized, it irradiates a light source with a wavelength of 785nm toward the thulium rod.

[0011] Moreover, when the direct current of 13A is passed into the thulium rod and it is irradiated by the light source of the LD semiconductor palladium bar, the two ends of the thulium rod emit 2000nm continuous light.

[0012] The advantages and technical effects of the present invention are:

[0013] The invention discloses an ultra-pulsed solid-state thulium laser. The semiconductor laser with a wavelength of 785 nm is generated by electrifying an LD semiconductor palladium bar. The semiconductor laser is irradiated and a 13A direct current is supplied to the thulium rod, so that the thulium rod generates mixed continuous light with a wavelength of 2000 nm. The mixed continuous light is emitted from one end of the thulium rod to an acousto-optic Q-switch and is compressed for the first time. The mixed continuous light is reflected by a high-reflection mirror and then compressed for the second time by the acousto-optic Q-switch. The mixed continuous light compressed twice is then emitted from the other end of the thulium rod to a high-reflection lens and a focusing mirror for filtering and focusing. The focused mixed continuous light is irradiated into an optical fiber of a coupler and can be used for surgery.

[0014] The ultra-pulsed solid-state thulium laser of the present invention differs from the prior art in that: 1. Mixed light is emitted by the LD semiconductor palladium bar and the thulium rod to achieve a 2000nm mixed continuous light output; 2. The mixed continuous light in the resonant cavity can be compressed back and forth through an acousto-optic Q-switch, so that the energy of the generally output mixed continuous light is compressed into extremely narrow pulses for emission, thereby doubling the peak power of the mixed continuous light.

[0015] The advantages of the ultra-pulsed solid-state thulium laser of the present invention over the existing technology are: 1. It can effectively increase the pulse rate and speed up the operation; 2. It can effectively increase the pulse peak power and improve the lithotripsy effect on large stones or extremely hard stones; 3. It improves the absorption rate of tissue (the wavelength of the holmium laser in the existing technology is 2140nm, which has a relatively high absorption rate in the human body, while the wavelength of the thulium laser is 2000nm, which has the highest absorption rate in the human body among the lasers that can be input into optical fiber transmission. That is, the absorption rate of 100W thulium laser to human tissue is equivalent to that of 170W holmium laser). BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the first embodiment of the present invention;

[0017] Figure 2 2 is a schematic structural diagram of a second embodiment of the present invention;

[0018] Figure 3 A comparison chart of the absorption rate curves of different light sources to tissues of the present invention and the prior art;

[0019] In the figure: 1-high reflective mirror; 2-acousto-optic Q-switch; 3-bracket; 4-thulium rod; 5-LD semiconductor palladium bar; 6-resonant cavity; 7-high lens; 8-focusing mirror; 9-coupler; 10-first thulium rod; 11-second thulium rod. DETAILED DESCRIPTION

[0020] In order to further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings. It should be noted that the embodiments are illustrative and not restrictive, and the scope of protection of the present invention cannot be limited thereby.

[0021] A super-pulsed solid-state thulium laser comprises a resonant cavity 6, one end of which is closed and the other end is connected to a coupler 9; a high-reflection mirror 1, an acousto-optic Q-switch 2, a thulium rod 4, a high-power lens 7 and a focusing mirror 8 are coaxially fixedly installed in the resonant cavity, wherein an LD semiconductor palladium bar 5 for projecting a light source toward the thulium rod is installed on the periphery of the thulium rod, and both the thulium rod and the LD semiconductor palladium bar are connected to a power supply; the acousto-optic Q-switch is installed at one end of the thulium rod, and the high-power lens, the focusing mirror and the coupler are installed at the other end of the thulium rod; and the high-reflection mirror is installed at the other end of the acousto-optic Q-switch.

[0022] Moreover, both ends of the thulium rod are fixedly supported by a bracket 3, and the bracket, the acousto-optic Q-switch, the high-reflection mirror, the high-reflection lens and the focusing mirror are all fixedly connected to the inner wall of the resonant cavity.

[0023] Moreover, the power supply converts 220V AC into 36V DC and passes it to the thulium rod and LD semiconductor palladium bar.

[0024] Moreover, when the LD semiconductor palladium bar is energized, it irradiates a light source with a wavelength of 785nm toward the thulium rod.

[0025] Moreover, when the direct current of 13A is passed into the thulium rod and it is irradiated by the light source of the LD semiconductor palladium bar, the two ends of the thulium rod emit 2000nm continuous light.

[0026] In addition, the present invention preferably uses mature products in the existing technology for the power supply, acousto-optic Q-switch and coupler, and the fixed connection method of the LD semiconductor palladium bar, bracket, acousto-optic Q-switch, high reflective mirror, high lens and focusing mirror to the resonant cavity all uses mature means in the existing technology.

[0027] In order to more clearly illustrate the specific embodiments of the present invention, an example is provided below:

[0028] The first embodiment is a BGⅠⅠ type central Q-switched laser: it includes a resonant cavity, one end of which is closed and the other end is connected to a coupler; a high-reflection mirror, an acousto-optic Q-switch, a thulium rod, a high-power lens and a focusing mirror are coaxially fixed in the resonant cavity in sequence, and an LD semiconductor palladium bar is installed on the outer periphery of the thulium rod to project a light source onto the outer peripheral wall of the thulium rod.

[0029] The advantage of this structure is that mixed continuous light can be emitted by the LD semiconductor palladium bar and the thulium rod. The mixed continuous light is reflected by a high-reflectivity mirror and compressed twice by the acousto-optic Q-switch in the same unit volume of the LD semiconductor palladium bar and the thulium rod, thereby improving the laser pulse rate, pulse peak power and tissue absorption rate.

[0030] The second embodiment is a BGⅠ type central Q-switched laser: it includes a resonant cavity, one end of which is closed and the other end is connected to a coupler; in the resonant cavity, a high-reflection mirror, a first thulium rod 10, an acousto-optic Q-switch, a second thulium rod 11, a high-reflection lens, a focusing mirror and a coupler are coaxially fixed in sequence from the closed end to the end connected to the coupler, and the outer periphery of the first thulium rod and the second thulium rod are both installed with LD semiconductor palladium bars that project light sources onto the circumferential outer wall of the thulium rod.

[0031] Compared with the first embodiment, the mixed continuous light in the second embodiment is reflected by a high-reflection mirror and compressed three times by an acousto-optic Q-switch under the same unit volume of the LD semiconductor palladium bar, the first thulium rod and the second thulium rod. The pulse rate, pulse peak power and tissue absorption rate of the mixed continuous light in the second embodiment are higher than those in the first embodiment.

[0032] It's important to note, as shown in Table 1: 1. How many times faster the pulse rate is correlated with how much faster the lithotripsy is during surgery; 2. A higher pulse peak power indicates a higher ability to break down hard stones; and 3. Tissue absorption is determined by wavelength. Holmium lasers, with a wavelength of 2140nm, have a relatively high absorption rate in the human body. Thulium lasers, with a wavelength of 2000nm, have the highest absorption rate in the human body among currently available fiber-optic transmission lasers. This means that a 100W thulium laser has the same absorption in human tissue as a 170W holmium laser.

[0033] In addition, Table 2 shows the technical parameters of the thulium lasers of the first and second embodiments of the present invention.

[0034] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the appended claims of the present invention.

[0035] Table 1. Comparison of output parameter values ​​of holmium laser and pulsed thulium laser

[0036]

[0037] Table 2. Technical specifications of ultra-pulsed all-solid-state thulium lasers

[0038] Output pulse frequency Single pulse energy Average maximum output power Pulse Width BGⅠtype 200HZ—1000HZ 300mJ—50mJ 60W 0.5—1.5us BGⅡ type 200HZ—1000HZ 200mJ—40mJ 40W 0.5—1.5us

Claims

1. A super-pulsed solid-state thulium laser, characterized in that: The invention comprises a resonant cavity, one end of which is closed and the other end is connected to a coupler; a high-reflection mirror, an acousto-optic Q-switch, a thulium rod, a high-reflection lens and a focusing mirror are coaxially fixed in the resonant cavity, wherein an LD semiconductor palladium bar is installed on the periphery of the thulium rod for projecting a light source toward the thulium rod, and both the thulium rod and the LD semiconductor palladium bar are connected to a power supply; the acousto-optic Q-switch is installed on one end of the thulium rod, and the high-reflection lens, the focusing mirror and the coupler are installed on the other end of the thulium rod; and the high-reflection mirror is installed on the other end of the acousto-optic Q-switch; After the LD semiconductor palladium bar is powered on, it irradiates the thulium rod with a light source having a wavelength of 785 nm; When the thulium rod is supplied with a direct current of 13A and is irradiated by a light source of a LD semiconductor palladium bar, both ends of the thulium rod emit 2000nm continuous light; Both ends of the thulium rod are fixedly supported by brackets, and the brackets, the acousto-optic Q-switch, the high-reflection mirror, the high-reflection lens and the focusing mirror are all fixedly connected to the inner wall of the resonant cavity.

2. The super-pulsed solid-state thulium laser according to claim 1, characterized in that: The power supply converts 220V alternating current into 36V direct current which is passed to the thulium rod and the LD semiconductor palladium bar.

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