A portable liquid nitrogen jet therapy device that is not prone to clogging

Abstract

The present invention relates to the field of medical device technology, and proposes a portable liquid nitrogen spray therapy device that is not easy to clog. The device comprises a threaded kettle body, a kettle lid, and an insulating liner installed inside the kettle body and the kettle lid. The upper end of the insulating liner is connected to a rubber plug, and the inside of the rubber plug is connected to a thick straight stainless steel capillary and an L-shaped 304 stainless steel capillary. The spray device and the kettle lid are connected by an auxiliary mechanism. The extension and contraction of the electric push rod can push the spray device up and down, and adjust the bending angle of the spray device so that the nozzle can be bent freely to adapt to more application scenarios, thereby improving the ease of use of the device. The thick straight stainless steel capillary and the spray device are connected by a rotating structure, which is different from the existing practice of directly bending the capillary. This ensures the circulation of liquid nitrogen between the thick straight stainless steel capillary and the spray device, and avoids clogging at the bend of the capillary due to the reduction of the bending radius.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a portable liquid nitrogen jet therapeutic device that is not prone to clogging. Background Art

[0002] Liquid nitrogen cryotherapy is a new technology in the field of modern therapeutics. It utilizes a comprehensive cryobiological effect. Normal cells undergo irreversible damage when extremely frozen. This treatment rapidly kills cells in the affected area, allowing the affected area to recover normally. It is generally used to treat benign skin lesions such as common warts, trichoepithelioma, verrucous nevus, seborrheic keratosis, facial sebaceous adenoma, and porokeratosis, with good therapeutic effects.

[0003] Existing liquid nitrogen therapy devices are made primarily of stainless steel and utilize the principle of phase change refrigeration. The pressure generated by the evaporation of liquid nitrogen causes the liquid nitrogen to flow from the liquid nitrogen cup through an infusion tube into the cold head, thereby achieving the desired cryotherapy effect. However, existing liquid nitrogen therapy devices are heavy, both in terms of the liquid nitrogen and the device itself. This can lead to unsteady hands and misaligned aiming for medical personnel performing liquid nitrogen therapy, especially spray therapy, which can damage surrounding skin. Furthermore, existing products rely on the pressure generated by the evaporation of liquid nitrogen to operate, requiring the liquid nitrogen cup to be shaken or pressure to be generated after phase change. This is time-consuming and laborious, resulting in poor temperature maintenance at the cryo head and a prone to clogging of the liquid nitrogen spray tube. Furthermore, maintenance and cleaning between uses are difficult, resulting in a short service life.

[0004] Therefore, we have made improvements to this problem and proposed a portable liquid nitrogen jet therapy device that is not easy to clog. Summary of the Invention

[0005] The object of the present invention is to provide a portable liquid nitrogen jet therapy device that is not easily clogged, so as to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned purpose of the invention, the present invention provides a portable liquid nitrogen spray therapy device that is not easy to clog, comprising a threaded kettle body, a kettle lid and an insulation liner installed inside the kettle body and the kettle lid, the upper end of the insulation liner is connected to a rubber stopper, the inside of the rubber stopper is connected to a thick straight stainless steel capillary and an L-shaped 304 stainless steel capillary, the upper end of the thick straight stainless steel capillary is movably connected to a spray device, the top end of the spray device is threadedly connected to a nozzle, and the middle part of the spray device is connected to an auxiliary mechanism, the auxiliary mechanism is fixedly installed on the edge of the kettle lid, the upper end of the L-shaped 304 stainless steel capillary is threadedly connected to a trigger device, and the trigger device is fixedly connected to the handle of the kettle body.

[0007] As a further solution of the present invention, the thermal insulation inner liner includes a glass liner, the upper end of the glass liner is fixedly connected with a spacer, the lower section of the L-shaped 304 stainless steel capillary is installed through the spacer, and the lower section of the thick straight stainless steel capillary is installed inside the glass liner through the spacer.

[0008] As a further solution of the present invention, the rubber stopper includes a conical stopper, the upper end of the conical stopper is connected to a spring washer, the spring washer is fixedly connected to the pot lid, a first through hole and an L-shaped second through hole are opened on the conical stopper, the thick straight stainless steel capillary is fixed inside the first through hole, and the L-shaped 304 stainless steel capillary is fixed inside the second through hole.

[0009] As a further solution of the present invention, the thick straight stainless steel capillary includes a connecting tube, the upper end of the connecting tube is fixedly connected to a V-shaped bend, both ends of the bend are simultaneously sleeved on the injection device, and the bottom end of the connecting tube is fixedly connected to a metal tube, which extends to one centimeter above the bottom surface of the glass bladder.

[0010] As a further solution of the present invention, the injection device includes a T-shaped injection pipe, a limiting ring is fixedly installed on one side of the internal T-shaped structure of the injection pipe, the tail end of the injection pipe is connected to a sealing plug, a piston is movably installed on the front side of the internal limiting ring of the injection pipe, the rear end of the piston is fixedly connected to a guide rod, the guide rod penetrates the sealing plug and is connected to a first spring, and the first spring fixedly connects the guide rod and the sealing plug, a plug is provided between the piston and the guide rod, and the plug is movably sleeved inside the piston.

[0011] As a further solution of the present invention, the piston includes a plug shell, a tapered barrel is connected to the middle of the plug shell, and the plug shell.

[0012] As a further solution of the present invention, a spike cone is fixedly connected to the top end of the injection pipe, and the middle part of the spike cone is a metal rod with the same length as the piston.

[0013] As a further solution of the present invention, the plug includes a conical block, a pressing groove is provided at the top of the block, the pressing groove and the nail cone are located on the same axis, the bottom end of the block is connected to a connecting plate, and a second spring is connected between the connecting plate and the piston.

[0014] As a further solution of the present invention, the trigger device includes an airbag, the upper end of the airbag is fixedly connected to a rubber tube, the bottom end of the airbag is fixedly connected to an exhaust pipe, the rubber tube is threadedly connected to the L-shaped stainless steel capillary, a limiting plate is provided inside the airbag, the bottom end of the limiting plate is connected to a bolt, the bolt penetrates the handle of the kettle body and is connected to a nut.

[0015] As a further solution of the present invention, the auxiliary mechanism includes a protective sleeve and a fixing part, the bottom end of the protective sleeve is connected to a heat-insulating cylinder, the heat-insulating cylinder is wrapped around the upper end of a thick straight stainless steel capillary, the fixing part is fixedly installed on the upper end of the kettle lid, an electric heating wire is installed in the interlayer space between the protective sleeve and the kettle lid, a switch key is fixedly installed on the end of the protective sleeve, the protective sleeve is sleeved on the middle part of the outer side of the spray device, and connecting parts are fixedly installed on both sides of the protective sleeve, an electric push rod is connected to the connecting part, and the bottom end of the electric push rod is movably connected to the fixing part.

[0016] The present invention provides a portable liquid nitrogen jet therapy device that is not prone to clogging, and its beneficial effects are:

[0017] 1. A spray device is movably installed on the upper end of a thick straight stainless steel capillary tube, and the spray device is connected to the kettle lid through an auxiliary mechanism. The extension and retraction of the electric push rod can push the spray device up and down, and adjust the bending angle of the spray device, so that the nozzle can be freely bent to adapt to more application scenarios, thereby improving the ease of use of the device. The thick straight stainless steel capillary tube and the spray device are connected by a rotating structure, which is different from the existing method of directly bending the capillary tube. This ensures the circulation of liquid nitrogen between the thick straight stainless steel capillary tube and the spray device, and avoids blockage at the bend of the capillary tube due to the reduction of the bending radius.

[0018] 2. A movable piston and guide rod are installed inside the injection tube. The guide rod and the injection tube are squeezed by a first spring, and a plug is installed between the piston and the guide rod. When liquid nitrogen is ejected from the thick straight stainless steel capillary into the injection device, the ejected liquid nitrogen pushes the piston and the guide rod to slide in the injection tube. When the liquid nitrogen reaches the top of the injection tube, the plug is pushed by the spike to separate the plug from the piston. The liquid nitrogen is ejected quickly along the gap between the piston and the plug. After the injection is completed, the first spring pulls the piston and the guide rod back. The inner wall of the injection tube is wiped by the pushing and pulling process. Maintenance and cleaning can be achieved every time it is used, preventing water molecules and carbon dioxide impurities in the air from entering the container after injection and condensing into ice to cause blockage in the low temperature environment formed by liquid nitrogen, and also avoiding liquid nitrogen residue.

[0019] 3. An auxiliary mechanism is installed inside the injection pipe, and the auxiliary mechanism includes a protective sleeve and an insulation cylinder wrapped around the thick straight stainless steel capillary and the outside of the injection device. The thick straight stainless steel capillary and the injection device are insulated by the protective sleeve and the insulation cylinder. At the same time, an electric heating wire is installed inside the protective sleeve. The electric auxiliary heating of the electric heating wire heats the injection device before and after the injection of liquid nitrogen, and dries the moisture inside and outside the injection device, so as to prevent water molecules and carbon dioxide impurities in the air from entering the container and condensing into ice and causing blockage in the low temperature environment formed by liquid nitrogen, and ensure smooth pushing and pulling between the injection pipe and the piston of the injection device.

[0020] 4. By connecting an auxiliary mechanism to the outside of the injection device, the protective sleeve insulates the injection device, thereby improving the insulation effect of the injection device and controlling the temperature of the liquid nitrogen. At the same time, since the interior of the glass bladder is connected to the outside, the extrusion trigger device maintains a negative pressure environment inside the glass bladder, squeezing out the liquid nitrogen inside the glass bladder. At the same time, a limit plate is installed inside the airbag. The position of the limit plate inside the airbag is adjusted by rotating the nut to make the pressing depth of the airbag different, thereby controlling the amount of liquid nitrogen sprayed each time, which will not change due to the number of uses, improving the user experience and lowering the usage threshold. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of the structure of a portable liquid nitrogen jet therapy device that is not prone to clogging provided by this application;

[0023] Figure 2 A cross-sectional view of the structure of a portable liquid nitrogen jet therapy device that is not easily clogged provided by the present application;

[0024] Figure 3 A schematic diagram of the heat preservation inner tank structure of a portable liquid nitrogen jet therapy device that is not easily clogged provided by this application;

[0025] Figure 4 A schematic diagram of the rubber stopper structure of a portable liquid nitrogen jet therapy device that is not prone to clogging provided in this application;

[0026] Figure 5 A schematic diagram of the connection structure of a thick straight stainless steel capillary and a spray device of a portable liquid nitrogen spray therapy device that is not easily clogged provided by the present application;

[0027] Figure 6 This is a partially enlarged structural diagram of the spray device of a portable liquid nitrogen spray therapy device that is not easily clogged provided by the present application;

[0028] Figure 7 This is a schematic diagram of the piston and guide rod structure of a portable liquid nitrogen jet therapy device that is not easily clogged provided by the present application;

[0029] Figure 8 A schematic diagram of the structure of a trigger device of a portable liquid nitrogen jet therapy device that is not prone to clogging provided by this application;

[0030] Figure 9This is a schematic diagram of the auxiliary mechanism structure of a portable liquid nitrogen jet therapy device that is not easily clogged provided in this application.

[0031] In the figure: 1. kettle body; 2. kettle lid; 3. heat-insulating liner; 31. glass liner; 32. spacer; 4. rubber stopper; 41. tapered stopper; 42. first through hole; 43. second through hole; 44. spring washer; 5. thick straight stainless steel capillary; 51. connecting pipe; 52. elbow; 53. metal pipe; 6. injection device; 61. injection pipe; 62. sealing plug; 63. piston; 631. plug shell; 632. barrel; 64. guide rod; 65. first spring; 66. limit ring; 67. plug; 671 , block; 672, press groove; 673, connecting plate; 674, second spring; 68, nail cone; 7, nozzle; 8, L-shaped 304 stainless steel capillary; 9, trigger device; 91, airbag; 92, rubber tube; 93, limit plate; 94, bolt; 95, nut; 96, exhaust pipe; 10, auxiliary mechanism; 1001, protective cover; 1002, connector; 1003, electric push rod; 1004, fixing part; 1005, electric heating wire; 1006, switch; 1007, insulation cylinder. DETAILED DESCRIPTION

[0032] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0033] like Figures 1-9 As shown, this embodiment proposes a portable liquid nitrogen spray therapy device that is not easy to be clogged, including a kettle body 1, a kettle cover 2 and a heat-insulating liner 3 installed inside the kettle body 1 and the kettle cover 2. The upper end of the heat-insulating liner 3 is connected to a rubber plug 4, and the inside of the rubber plug 4 is connected to a thick straight stainless steel capillary 5 and an L-shaped 304 stainless steel capillary 8. The upper end of the thick straight stainless steel capillary 5 is movably connected to a spray device 6, the top end of the spray device 6 is threadedly connected to a nozzle 7, and the middle part of the spray device 6 is connected to an auxiliary mechanism 10, which is fixedly installed on the edge of the kettle cover 2, and the upper end of the L-shaped 304 stainless steel capillary 8 is threadedly connected to a trigger device 9, which is fixedly connected to the handle of the kettle body 1.

[0034] The thermal insulation liner 3 includes a glass liner 31, the upper end of which is fixedly connected to a spacer 32. The lower section of the L-shaped 304 stainless steel capillary tube 8 is installed through the spacer 32, and the lower section of the thick straight stainless steel capillary tube 5 is installed inside the glass liner 31 through the spacer 32, so that the internal pressure of the glass liner 31 is consistent with the external air pressure. When the trigger device 9 is squeezed, a negative pressure environment is formed inside the glass liner 31, and the pressure difference pushes the liquid nitrogen inside the glass liner 31 to be discharged, thereby preventing the concentration of liquid nitrogen inside the glass liner 31 from decreasing and controlling the amount of each spray to be controlled so that it does not change with the number of uses.

[0035] The rubber stopper 4 includes a tapered plug 41, the upper end of which is connected to a spring washer 44, which is fixedly connected to the pot lid 2. A first through hole 42 and an L-shaped second through hole 43 are provided on the tapered plug 41. A thick straight stainless steel capillary 5 is fixed inside the first through hole 42, and an L-shaped 304 stainless steel capillary 8 is fixed inside the second through hole 43. The first through hole 42 and the second through hole 43 seal and fix the installation of the thick straight stainless steel capillary 5 and the L-shaped 304 stainless steel capillary 8. There is no jamming between the tapered plug 41 and the thermal insulation liner 3, and the spring washer 44 presses on the glass liner 31. If the pressure inside the glass liner 31 increases, the tapered plug 41 will be pushed up for exhaust, eliminating safety hazards.

[0036] The thick straight stainless steel capillary 5 includes a connecting tube 51, the upper end of which is fixedly connected to a V-shaped bend 52, both ends of which are simultaneously sleeved on the injection device 6, and the bottom end of the connecting tube 51 is fixedly connected to a metal tube 53, which extends to one centimeter above the bottom surface of the glass liner 31. The thick straight stainless steel capillary 5 is connected to the interior of the thermal insulation liner 3 to discharge the liquid nitrogen inside the thermal insulation liner 3.

[0037] The injection device 6 includes a T-shaped injection tube 61, a limiting ring 66 is fixedly installed on one side of the internal T-shaped structure of the injection tube 61, the tail end of the injection tube 61 is connected to a sealing plug 62, a piston 63 is movably installed on the front side of the limiting ring 66 inside the injection tube 61, and the rear end of the piston 63 is fixedly connected to a guide rod 64, the guide rod 64 penetrates the sealing plug 62 and is connected to a first spring 65, and the first spring 65 fixes the guide rod 64 and the sealing plug 62. A plug 67 is provided between the piston 63 and the guide rod 64, and the plug 67 is movably sleeved inside the piston 63. The ejected liquid nitrogen pushes the piston 63 and the guide rod 64 to slide in the injection tube 61, and when it reaches the top of the injection tube 61, it passes through the spike 68 Push the plug 67 to separate the plug 67 from the piston 63, and the liquid nitrogen will be quickly ejected along the gap between the piston 63 and the plug 67. After the injection is completed, the first spring 65 will pull the piston 63 and the guide rod 64 back. The inner wall of the injection pipe 61 will be wiped during the pushing and pulling process of the piston 63. Maintenance and cleaning can be achieved every time it is used to prevent water molecules and carbon dioxide impurities in the air from entering the container after injection and condensing into ice in the low temperature environment formed by liquid nitrogen to cause blockage, and also to avoid liquid nitrogen residue. Ultra-low temperature resistant LNG sealing rings are used at the connections between the sealing plug 62 and the injection pipe 61, and the guide rod 64 and the sealing plug 62. The applicable temperature is between -200 and +300°C to prevent liquid nitrogen leakage.

[0038] The piston 63 includes a plug shell 631, and a tapered barrel 632 is connected to the middle of the plug shell 631. When liquid nitrogen is ejected, the plug shell 631 drives the plug shell 631 to slide inside the injection tube 61, wiping the inside of the injection tube 61 to remove impurities attached to the inside of the injection tube 61 and prevent impurities from condensing into ice and causing blockage.

[0039] A spike 68 is fixedly connected to the top of the injection tube 61. The middle part of the spike 68 is a metal rod with the same length as the piston 63. After the spike 68 contacts the front end of the plug 67, it limits the movement of the plug 67, so that the piston 63 and the plug 67 are separated, and the channel for liquid nitrogen to be sprayed out is opened, which facilitates the injection of liquid nitrogen.

[0040] The plug 67 includes a conical block 671, a top of which is provided with a pressing groove 672, which is coaxial with the spike 68. The bottom of the block 671 is connected to a connecting plate 673, and a second spring 674 is connected between the connecting plate 673 and the piston 63. When the plug 67 blocks the opening of the piston 63 and does not contact the spike 68, liquid nitrogen cannot be ejected through the piston 63, and the thrust generated drives the piston 63 to slide.

[0041] The trigger device 9 includes an airbag 91, the upper end of the airbag 91 is fixedly connected to a rubber tube 92, the bottom end of the airbag 91 is fixedly connected to an exhaust pipe 96, the rubber tube 92 is threadedly connected to the L-shaped 304 stainless steel capillary 8, a limit plate 93 is provided inside the airbag 91, the bottom end of the limit plate 93 is connected to a bolt 94, the bolt 94 penetrates the handle of the kettle body 1 and is connected to a nut 95, the rubber tube 92 and the airbag 91 blow gas into the glass liner 31, and squeeze the liquid nitrogen in the glass liner 31 into the thick straight stainless steel capillary 5 for spraying the liquid nitrogen.

[0042] The auxiliary mechanism 10 includes a protective sleeve 1001 and a fixing part 1004. The bottom end of the protective sleeve 1001 is connected to a heat preservation tube 1007, which is wrapped around the upper end of the thick straight stainless steel capillary 5. The fixing part 1004 is fixedly installed on the upper end of the pot cover 2. An electric heating wire 1005 is installed in the interlayer space between the protective sleeve 1001 and the pot cover 2. A switch key 1006 is fixedly installed at the end of the protective sleeve 1001. The protective sleeve 1001 is sleeved on the middle part of the outer side of the injection device 6, and connecting parts 1002 are fixedly installed on both sides of the protective sleeve 1001. An electric push rod 1003 is connected to the connecting part 1002. The bottom end of the electric push rod 1003 is movably connected to the fixing part 1004. The protective sleeve 1001 insulates and protects the injection device 6 and controls the temperature of the liquid nitrogen. At the same time, the electric push rod 1003 is extended and retracted to drive the injection device 6 to adjust its angle, which is convenient for the use of the nozzle 7 in different application modes.

[0043] Specifically, when the portable liquid nitrogen spray therapy device that is not easy to clog is in use: the kettle body 1 and the kettle lid 2 are screwed tightly, the kettle lid 2 presses the rubber plug 4 on the heat-insulating liner 3, and before operation, the L-shaped 304 stainless steel capillary 8 is separated from the trigger device 9, the kettle lid 2 is unscrewed, and the rubber plug 4 is pulled out to add liquid nitrogen to the heat-insulating liner 3. The upper end of the thick straight stainless steel capillary 5 is movably equipped with a spray device 6, and the spray device 6 and the kettle lid 2 are connected by an auxiliary mechanism 10. The extension and contraction of the electric push rod 1003 can push the spray device 6 up and down to adjust the bending angle of the spray device 6. The interior of the glass liner 31 is kept under negative pressure. The trigger device 9 is squeezed, and the rubber tube 92 and the air bag 91 are used to blow gas into the glass liner 31, squeezing the liquid nitrogen in the glass liner 31 into the thick straight stainless steel capillary 5. The thick straight stainless steel capillary 5 flows the liquid nitrogen into the injection device 6. The ejected liquid nitrogen pushes the piston 63 and the guide rod 64 to slide in the injection tube 61. When the liquid nitrogen reaches the top of the injection tube 61, the spike 68 pushes the plug 67 to separate the plug 67 from the piston 63. The liquid nitrogen is ejected quickly along the gap between the piston 63 and the plug 67. After the injection is completed, the first spring 65 pulls the piston 63 and the guide rod 64 back. The inner wall of the injection pipe 61 is wiped during the process, and maintenance and cleaning can be achieved every time it is used, so as to prevent water molecules and carbon dioxide impurities in the air from entering the container after injection and condensing into ice to cause blockage in the low temperature environment formed by liquid nitrogen, and also to avoid liquid nitrogen residue; an auxiliary mechanism 10 is sleeved on the outer side of the injection device 6, and the protective sleeve 1001 insulates the injection device 6, and the switch key 1006 is turned on to start the electric auxiliary heating of the electric heating wire 1005, and the injection device 6 is heated before and after the injection of liquid nitrogen, and the injection pipe 61 and the piston 63 are heated to ensure the smooth movement of the piston 63 when it is pushed outward. The liquid nitrogen is sprayed out smoothly through the piston 63, and after the liquid nitrogen is sprayed, the switch key 1006 is closed, so that the electric heating wire 1005 is no longer heated, and the sprayed liquid nitrogen contacts the lesion and then vaporizes, which plays a role in lowering the temperature of the lesion. At the same time, after the liquid nitrogen treatment is completed, the electric auxiliary heating of the electric heating wire 1005 is reopened to assist the closure of the piston 63. At this time, the remaining small amount of liquid nitrogen remaining in the injection tube 61 is heated and vaporized and discharged through the exhaust pipe 96 to avoid excessive pressure in the thermal insulation liner 3. The content not described in detail in this specification belongs to the existing technology known to professional and technical personnel in this field.

[0044] The above embodiments are intended to illustrate the present invention only and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various combinations, modifications, or equivalent substitutions of the technical solutions of the present invention do not depart from the spirit and scope of the technical solutions of the present invention and should be encompassed by the scope of the claims of the present invention.

Claims

1. A portable liquid nitrogen jet therapy device that is not easily clogged, comprising a pot body and a pot cover connected by threads, and a heat-insulating liner installed inside the pot body and the pot cover, characterized in that: The upper end of the heat-insulating liner is connected with a rubber stopper, and the interior of the rubber stopper is connected with a thick straight stainless steel capillary and an L-shaped 304 stainless steel capillary. The upper end of the thick straight stainless steel capillary is movably connected with a spray device, the top end of the spray device is threadedly connected to a nozzle, and the middle part of the spray device is connected with an auxiliary mechanism, and the auxiliary mechanism is fixedly installed on the edge of the pot cover, and the upper end of the L-shaped 304 stainless steel capillary is threadedly connected to a trigger device, and the trigger device is fixedly connected to the handle of the pot body; the spray device includes a T-shaped spray pipe, and a limiting ring is fixedly installed on one side of the internal T-shaped structure of the spray pipe, and a sealing plug is connected to the tail end of the spray pipe, and a piston is movably installed on the front side of the limiting ring inside the spray pipe, and the rear end of the piston is fixedly connected to a guide rod, and the guide rod penetrates the sealing plug and is connected to a first spring Spring, and the first spring fixedly connects the guide rod and the sealing plug, a plug is provided between the piston and the guide rod, and the plug is movably sleeved inside the piston. After the injection is completed, the first spring pulls the piston and the guide rod back, and the inner wall of the injection pipe is wiped through the push-pull process; the auxiliary mechanism includes a protective sleeve and a fixing piece, the bottom end of the protective sleeve is connected with a heat-insulating cylinder, the heat-insulating cylinder is wrapped around the upper end of the thick straight stainless steel capillary, the fixing piece is fixedly installed on the upper end of the pot cover, an electric heating wire is installed in the interlayer space between the protective sleeve and the pot cover, and a switch key is fixedly installed on the end of the protective sleeve, and the protective sleeve is sleeved on the middle part of the outer side of the injection device. The protective sleeve insulates the injection device, and the switch key is turned on to start the electric auxiliary heating of the electric heating wire, so that the injection device is heated before and after the injection of liquid nitrogen, and the injection pipe and the piston are heated.

2. The portable liquid nitrogen jet therapy device that is not easily clogged according to claim 1, characterized in that: The heat-insulating inner liner includes a glass liner, the upper end of the glass liner is fixedly connected to a spacer, the lower section of the L-shaped 304 stainless steel capillary is installed through the spacer, and the lower section of the thick straight stainless steel capillary is installed inside the glass liner through the spacer.

3. The portable liquid nitrogen jet therapy device that is not easily clogged according to claim 1, characterized in that: The rubber stopper includes a conical stopper, the upper end of the conical stopper is connected to a spring washer, the spring washer is fixedly connected to the pot lid, a first through hole and an L-shaped second through hole are opened on the conical stopper, the thick straight stainless steel capillary is fixed inside the first through hole, and the L-shaped 304 stainless steel capillary is fixed inside the second through hole.

4. The portable liquid nitrogen jet therapy device that is not easily clogged according to claim 2, characterized in that: The thick straight stainless steel capillary includes a connecting tube, the upper end of which is fixedly connected to a V-shaped elbow, both ends of which are simultaneously sleeved on the injection device, and the bottom end of the connecting tube is fixedly connected to a metal tube, which extends to one centimeter above the bottom surface of the glass bladder.

5. The portable liquid nitrogen jet therapy device that is not easily clogged according to claim 1, characterized in that: The piston comprises a plug shell, and a tapered barrel is connected to the middle of the plug shell.

6. The portable liquid nitrogen jet therapy device that is not easily clogged according to claim 1, characterized in that: The top end of the injection pipe is fixedly connected with a spike cone, and the middle part of the spike cone is a metal rod with the same length as the piston.

7. The portable liquid nitrogen jet therapy device that is not easily clogged according to claim 6, characterized in that: The plug includes a conical block, a top end of the block is provided with a pressing groove, the pressing groove and the spike are located on the same axis, the bottom end of the block is connected to a connecting plate, and a second spring is connected between the connecting plate and the piston.

8. The portable liquid nitrogen jet therapy device that is not easily clogged according to claim 1, characterized in that: The trigger device includes an airbag, the upper end of the airbag is fixedly connected to a rubber tube, the bottom end of the airbag is fixedly connected to an exhaust pipe, the rubber tube is threadedly connected to an L-shaped 304 stainless steel capillary, a limit plate is provided inside the airbag, the bottom end of the limit plate is connected to a bolt, the bolt penetrates the handle of the kettle body and is connected to a nut.

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