Nitrogen discharge controllable liquid nitrogen cryotherapy pen for dermatology

Abstract

The application discloses a skin nitrogen-discharging controllable liquid nitrogen cryotherapy pen and relates to the technical field of cryotherapy. The surface of the upper pen body is fixedly connected with a limiting block one, the surface of the lower pen body is fixedly connected with a limiting block two, the outer surfaces of the upper pen body and the lower pen body are slidably connected with a sleeve, and the surface of the sleeve is provided with limiting grooves suitable for the sliding of the limiting block one and the limiting block two. The skin nitrogen-discharging controllable liquid nitrogen cryotherapy pen can control the height of the stop block by pulling the pull plate and controlling the moving rod one, so that the flow of the liquid nitrogen flowing down to the lower pen body through the hopper can be controlled, the individualized treatment requirements of different patients with different lesion thicknesses and areas can be met, the upper movement of the pull plate drives the piston cylinder to generate negative pressure under the linkage cooperation of multiple structures, the transparent suction disc is firmly adsorbed to the skin lesion, the physical isolation of the liquid nitrogen from sliding to the normal skin of the patient is realized, and secondary cold injury to the skin of the patient is avoided.

Description

Technical Field

[0001] This invention relates to the field of cryotherapy technology, specifically to a liquid nitrogen cryotherapy pen with controllable nitrogen removal for dermatological use. Background Technology

[0002] Liquid nitrogen cryotherapy is a novel technology in the field of modern therapeutics. It is a comprehensive effect of cryobiology, where normal cells suffer irreversible damage under extreme freezing conditions. Liquid nitrogen cryotherapy rapidly kills the diseased cells under extreme freezing conditions, allowing the affected area to recover normally. It is generally used to treat benign skin growths such as warts, trichoepitheliomas, verrucous nevi, seborrheic keratosis, facial sebaceous adenomas, and porokeratosis, with good treatment results. To improve the efficiency of cryotherapy, many liquid nitrogen cryotherapy pens have appeared on the market.

[0003] However, current liquid nitrogen cryotherapy pens still have the following problems during use: 1. The amount of liquid nitrogen discharged each time in existing liquid nitrogen cryotherapy pens is mostly a fixed value, making it difficult to adjust the amount of liquid nitrogen discharged according to different patient conditions; 2. Existing liquid nitrogen cryotherapy lacks protective components during use, and the discharged liquid nitrogen can easily slip onto the patient's normal skin, potentially causing secondary cryotherapy damage.

[0004] Therefore, there is an urgent need for a liquid nitrogen cryotherapy pen with controllable nitrogen removal in dermatology to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a liquid nitrogen cryotherapy pen with controllable nitrogen removal for dermatological use, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a liquid nitrogen cryotherapy pen for dermatological nitrogen removal controllable, comprising an upper pen body and a lower pen body, wherein three fixed rods arranged in a circular array are fixedly connected between the upper pen body and the lower pen body, a limiting block one is fixedly connected to the surface of the upper pen body, a limiting block two is fixedly connected to the surface of the lower pen body, a sleeve is slidably connected to the outer surfaces of the upper pen body and the lower pen body, a limiting groove is provided on the surface of the sleeve for the limiting block one and the limiting block two to slide and adapt, a cover plate is provided on the upper surface of the upper pen body, a sealing plug is fixedly connected to the lower surface of the cover plate, a pen tip is fixedly connected to the lower surface of the lower pen body, and a transparent suction cup is fixedly installed on the surface of the pen tip; The sleeve is equipped with an auxiliary component for controlling the amount of liquid nitrogen discharged from the upper pen body; The lower pen body is equipped with an isolation component for sucking up the patient's lesion skin when a large amount of liquid nitrogen is discharged from the upper pen body.

[0007] Optionally, the auxiliary component includes two symmetrically arranged fixing blocks fixedly connected to the surface of the sleeve, a pull plate fixedly connected to the surface of each of the two fixing blocks, a connecting ring slidably connected to the surface of the upper pen body, the ends of the two pull plates fixedly connected to the connecting ring, and a slider fixedly connected to the surface of the pull plate.

[0008] Optionally, the surface of the upper pen body is provided with a groove for the slider to extend and slide. A limiting rod is fixedly connected to the inner wall of the groove. The limiting rod passes through the slider and is slidably connected to it. A spring is provided between the slider and the inner wall of the groove.

[0009] Optionally, a funnel is fixedly connected to the surface of the upper pen body, a second sliding groove is provided on the inner wall of the upper pen body, a first movable plate is slidably connected to the inner wall of the second sliding groove, a connecting column is fixedly connected to the lower surface of the first movable plate, and a stop block that fits against the funnel is fixedly connected to the end of the connecting column. A support plate is fixedly connected to the inner wall of the sleeve, and a movable rod is fixedly connected to the surface of the support plate.

[0010] Optionally, the isolation component includes a piston cylinder fixedly installed on the surface of the lower pen body, a piston plate slidably connected to the inner wall of the piston cylinder, a piston rod fixedly connected to the surface of the piston plate, a connecting block fixedly connected to the end of the piston rod extending out of the piston cylinder, a second spring being provided between the connecting block and the piston cylinder, and an abutment block one and an abutment block two fixedly connected to the surface of the sleeve.

[0011] Optionally, an air outlet pipe is fixedly connected to the surface of the piston cylinder, an elastic rope is provided on the surface of the air outlet pipe, a sealing block is fixedly connected to the end of the elastic rope, and an air suction pipe is fixedly connected to the surface of the piston cylinder, with the end of the air suction pipe away from the piston cylinder being fixedly connected to the transparent suction cup.

[0012] Optionally, a one-way valve is provided on the surface of the air outlet pipe, and a one-way valve is provided on the surface of the air intake pipe.

[0013] Optionally, a support plate two is fixedly connected to the inner wall of the pen tip, a limit rod two is slidably connected to the surface of the support plate two, a blocking ball is fixedly connected to the end of the limit rod two away from the support plate two, a spring three is provided between the blocking ball and the support plate two, and a rubber pad is provided on the surface of the pen tip.

[0014] Optionally, a heater is fixedly installed on the surface of the lower pen body, a temperature display panel is provided on the surface of the heater, control button one and control button two are provided on the surface of the heater, an air inlet pipe and a connecting pipe are fixedly connected to the surface of the heater, an arc-shaped shell is fixedly installed on the surface of the lower pen body, the end of the connecting pipe away from the heater is fixedly connected to the arc-shaped shell, and a one-way valve three is provided on the surface of the connecting pipe.

[0015] Optionally, a movable plate 2 is slidably connected to the inner wall of the arc-shaped shell, and two symmetrically arranged movable rods 2 are fixedly connected to the surface of the movable plate 2. The ends of the two movable rods 2 extending out of the arc-shaped shell are jointly fixedly connected to a pressure plate. A spring 4 is jointly provided between the pressure plate and the arc-shaped shell. A heating tube is jointly fixedly connected between the arc-shaped shell and the transparent suction cup. A one-way valve 4 and a valve are provided on the surface of the heating tube.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, by pulling the pull plate and moving the sleeve upwards, simultaneously drives the piston plate to move upwards within the piston cylinder, generating negative pressure. This ensures the transparent suction cup firmly adheres to the skin lesion, physically preventing liquid nitrogen from slipping onto the patient's normal skin and avoiding secondary freezing damage. Furthermore, for thicker lesions, increasing the pull plate displacement allows the liquid nitrogen cryotherapy pen to expel more liquid nitrogen while simultaneously increasing the negative pressure within the piston cylinder. This causes a slight bulge in the patient's skin lesion, reducing skin tension and blood supply, thus improving the freezing depth and therapeutic effect of liquid nitrogen therapy. It is particularly suitable for stubborn, thick skin lesions, achieving precise control of nitrogen expulsion and efficient cryotherapy, solving the problems of fixed nitrogen expulsion and lack of protection during use in traditional treatment pens.

[0017] Second, by pulling the pull plate, the sleeve moves upward, and the height of the moving rod lifting the stop block can be controlled, thus precisely controlling the flow rate of liquid nitrogen through the funnel to the lower pen body. This can meet the personalized treatment needs of different patients with different lesion thicknesses and areas, and improve the applicability of the liquid nitrogen cryotherapy pen.

[0018] Third, by turning on the heater and repeatedly pressing the pressure plate, the heated air can be introduced into the transparent suction cup to heat the lesion skin and pen tip of the patient after cryotherapy, melting the ice crystal adhesion formed between the pen tip and the frozen necrotic tissue. This achieves automated processing after cryotherapy, solving the clinical problem that the pen tip and frozen necrotic tissue are stuck together due to low temperature after cryotherapy, and that forced separation can easily lead to tissue tearing or severe pain. This simplifies the doctor's operation process and improves the efficiency of diagnosis and treatment. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of a liquid nitrogen cryotherapy pen for dermatological treatment with controllable nitrogen removal, provided by the present invention.

[0020] Figure 2 This invention provides a dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal. Figure 1 Enlarged view of point A in the middle.

[0021] Figure 3 This is a cross-sectional view of a liquid nitrogen cryotherapy pen for dermatological treatment with controllable nitrogen removal, provided by the present invention.

[0022] Figure 4 This invention provides a dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal. Figure 3 Enlarged view of point B in the middle.

[0023] Figure 5 This invention provides a dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal. Figure 3 A magnified view of point C in the middle.

[0024] Figure 6 This invention provides a dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal. Figure 3 Enlarged view of point D in the middle.

[0025] Figure 7 This is a cross-sectional view of the cannula structure in a liquid nitrogen cryotherapy pen with controllable nitrogen removal for dermatology, provided by the present invention.

[0026] Figure 8 This is a cross-sectional view of the arc-shaped shell structure of a liquid nitrogen cryotherapy pen with controllable nitrogen removal for dermatology, provided by the present invention. Figure 9 This is a cross-sectional view of the lower part of the pen body structure in a dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal provided by the present invention.

[0027] Figure 10 An exploded view of the structure of a liquid nitrogen cryotherapy pen with controllable nitrogen removal for dermatology, provided by the present invention.

[0028] In the diagram: 1. Upper pen body; 2. Cover plate; 3. Sleeve; 4. Lower pen body; 5. Transparent suction cup; 6. Pen tip; 7. Pull plate; 8. Slider; 9. Limiting block one; 10. Fixing block; 11. Abutting block two; 12. Piston cylinder; 13. Connecting block; 14. Piston plate; 15. Heating tube; 16. Valve; 17. Temperature display panel; 18. Control button one; 19. Control button two; 20. One-way valve three; 21. Connecting pipe; 22. Moving rod two; 23. Arc-shaped housing; 24. One-way valve four; 25. Spring four; 26. Pressure plate; 27. Limiting block two; 28. Heater; 29. ​​Sealing plug 30. Slide groove II; 31. Moving plate I; 32. Funnel; 33. Connecting column; 34. Stop block; 35. Fixing rod; 36. Support plate I; 37. Limiting groove; 38. Moving rod I; 39. Connecting ring; 40. Slide groove I; 41. Limiting rod I; 42. Spring I; 43. Suction pipe; 44. Abutting block I; 45. Spring II; 46. Exhaust pipe; 47. Elastic rope; 48. Sealing block; 49. One-way valve I; 50. One-way valve II; 51. Piston rod; 52. Spring III; 53. Limiting rod II; 54. Support plate II; 55. Rubber pad; 57. Moving plate II; 58. Barrier ball. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 10 This invention provides a technical solution: a liquid nitrogen cryotherapy pen for dermatological nitrogen removal controllable, comprising an upper pen body 1 and a lower pen body 4. The upper pen body 1 and the lower pen body 4 are fixedly connected by three fixed rods 35 arranged in a circumferential array. A limiting block 9 is fixedly connected to the surface of the upper pen body 1, and a limiting block 27 is fixedly connected to the surface of the lower pen body 4. A sleeve 3 is slidably connected to the outer surfaces of the upper pen body 1 and the lower pen body 4. A limiting groove 37 is opened on the surface of the sleeve 3 for the limiting block 9 and the limiting block 27 to slide and adapt. A cover plate 2 is provided on the upper surface of the upper pen body 1, and a sealing plug 29 is fixedly connected to the lower surface of the cover plate 2. A pen tip 6 is fixedly connected to the lower surface of the lower pen body 4, and a transparent suction cup 5 is fixedly installed on the surface of the pen tip 6.

[0031] The cannula 3 is equipped with an auxiliary component for controlling the amount of liquid nitrogen discharged from the upper pen body 1; the lower pen body 4 is equipped with an isolation component for sucking up the patient's lesion skin when the amount of liquid nitrogen discharged from the upper pen body 1 is large.

[0032] The auxiliary components include two symmetrically arranged fixing blocks 10 fixedly connected to the surface of the sleeve 3. Pull plates 7 are fixedly connected to the surface of each of the two fixing blocks 10. A connecting ring 39 is slidably connected to the surface of the upper pen body 1. The ends of the two pull plates 7 are fixedly connected to the connecting ring 39. A slider 8 is fixedly connected to the surface of the pull plate 7.

[0033] The surface of the upper pen body 1 is provided with a groove 40 for the slider 8 to extend and slide. A limit rod 41 is fixedly connected to the inner wall of the groove 40. The limit rod 41 passes through the slider 8 and is slidably connected to it. A spring 42 is provided between the slider 8 and the inner wall of the groove 40.

[0034] A funnel 32 is fixedly connected to the surface of the upper pen body 1. A second sliding groove 30 is provided on the inner wall of the upper pen body 1. A first moving plate 31 is slidably connected to the inner wall of the second sliding groove 30. A connecting post 33 is fixedly connected to the lower surface of the first moving plate 31. A stop block 34 that fits against the funnel 32 is fixedly connected to the end of the connecting post 33.

[0035] A support plate 36 is fixedly connected to the inner wall of the sleeve 3, and a moving rod 38 is fixedly connected to the surface of the support plate 36.

[0036] The isolation component includes a piston cylinder 12 fixedly installed on the surface of the lower pen body 4. A piston plate 14 is slidably connected to the inner wall of the piston cylinder 12. A piston rod 51 is fixedly connected to the surface of the piston plate 14. A connecting block 13 is fixedly connected to the end of the piston rod 51 that extends out of the piston cylinder 12. A second spring 45 is provided between the connecting block 13 and the piston cylinder 12. An abutment block 44 and an abutment block 11 are fixedly connected to the surface of the sleeve 3.

[0037] An air outlet pipe 46 is fixedly connected to the surface of the piston cylinder 12. An elastic rope 47 is provided on the surface of the air outlet pipe 46. A sealing block 48 is fixedly connected to the end of the elastic rope 47. An air suction pipe 43 is fixedly connected to the surface of the piston cylinder 12. The end of the air suction pipe 43 away from the piston cylinder 12 is fixedly connected to the transparent suction cup 5.

[0038] One-way valve 49 is provided on the surface of the air outlet pipe 46, and one-way valve 50 is provided on the surface of the air intake pipe 43.

[0039] A support plate 2 54 is fixedly connected to the inner wall of the pen tip 6. A limit rod 2 53 is slidably connected to the surface of the support plate 2 54. A blocking ball 58 is fixedly connected to the end of the limit rod 2 53 away from the support plate 2 54. A spring 3 52 is provided between the blocking ball 58 and the support plate 2 54. A rubber pad 55 is provided on the surface of the pen tip 6.

[0040] More specifically, in this embodiment: as Figure 1 and Figure 3As shown, open the cover plate 2, remove the sealing plug 29 from the upper pen body 1, and then pour liquid nitrogen into the upper pen body 1. Then, put the sealing plug 29 back into the upper pen body 1. At this time, the baffle 34 is in a position that fits against the funnel 32. The liquid nitrogen poured into the upper pen body 1 will not enter the lower pen body 4, and thus will not flow out from the pen tip 6 below the lower pen body 4.

[0041] Position the pen tip 6 against the lesion on the patient's skin, ensuring the transparent suction cup 5 adheres to the skin at the lesion site. Figure 6 As shown, when the pen tip 6 comes into contact with the patient's skin, it will push the barrier ball 58 to move upward, and at the same time the spring 3 52 will contract upward. At this time, the opening between the barrier ball 58 and the pen tip 6 will open a space for liquid nitrogen to flow out.

[0042] Next, pull the two pull plates 7 upwards. Under the connecting action of the fixing block 10, the sleeve 3 moves upwards, as shown. Figure 3 and Figure 4 As shown, as the sleeve 3 moves upward, the moving rod 38 moves upward synchronously under the connecting action of the support plate 36. When the moving rod 38 comes into contact with the stop block 34, it will push the stop block 34 to move upward, thereby causing the stop block 34 to disengage from the funnel 32.

[0043] It should be noted that the longer the upward displacement of the pull plate 7, the higher the stop block 34 will be lifted. As the height of the stop block 34 lifted by the moving rod 38 increases, the space between the stop block 34 and the funnel 32 becomes larger, allowing more liquid nitrogen to flow into the inner cavity of the lower pen body 4 through the space between the stop block 34 and the funnel 32. This achieves the effect of controlling the amount of nitrogen discharged by the liquid nitrogen cryotherapy pen. The discharged liquid nitrogen will flow to the lesion on the patient's skin through the gap between the barrier ball 58 and the opening of the pen tip 6. By letting the liquid nitrogen cryotherapy pen stand still for a period of time, the cryotherapy on the lesion on the patient's skin can be completed. The barrier ball 58 is designed to allow liquid nitrogen to slowly flow out from the gap between the barrier ball 58 and the opening of the pen tip 6 to the lesion on the patient's skin, avoiding large-scale spraying of liquid nitrogen. On the other hand, when the liquid nitrogen cryotherapy pen is not in use, the barrier ball 58 will block the opening of the pen tip 6 to ensure good sealing of the pen tip 6.

[0044] During the upward pulling of the two pull plates 7, the slider 8 will also slide upward within the slide groove 40, and the spring 42 will be compressed. After one nitrogen purging cycle is completed, the pull plates 7 are released, and under the action of the elastic potential energy of the spring 42, the two pull plates 7 and the sleeve 3 will be reset. As the sleeve 3 resets, the moving rod 38 will disengage from the stop block 34. Figure 2 and Figure 7As shown, under the action of gravity, the stop block 34 will return to the position where it fits against the funnel 32. At this time, the liquid nitrogen in the upper pen body 1 can no longer flow into the lower pen body 4.

[0045] like Figure 3 , Figure 4 and Figure 5 As shown, the sealing block 48 is inserted into the vent pipe 46, preventing the piston cylinder 12 from venting. During the upward pulling of the two pull plates 7, as the sleeve 3 moves upward, the abutment block 44 moves upward synchronously. As the abutment block 44 moves upward, the connecting block 13 moves upward synchronously, causing the piston rod 51 to drive the piston plate 14 to move upward within the piston cylinder 12. Since the vent pipe 46 is sealed at this time, and the flow direction of the one-way valve 50 on the surface of the suction pipe 43 is from the suction pipe 43 into the piston cylinder 12, as the piston plate 14 moves upward, under the negative pressure inside the piston cylinder 12, the transparent suction cup 5 below can be made to suck air, so that the transparent suction cup 5 can be tightly attached to the lesion on the patient's skin, thereby preventing liquid nitrogen from flowing onto the patient's normal skin and causing secondary damage to the patient.

[0046] It should be noted that for patients with more severe skin lesions, the upward displacement of the pull plate 7 should be increased first to allow more liquid nitrogen to be discharged for cryotherapy of the lesions. On the other hand, as the upward displacement of the pull plate 7 increases, the upward movement of the piston plate 14 within the piston cylinder 12 also increases, resulting in a stronger negative pressure in the piston cylinder 12. The strong negative pressure transmitted from the piston cylinder 12 to the transparent suction cup 5 can lift and bulge the lesion, bringing the liquid nitrogen outflow point closer to the base of the lesion. Furthermore, the increased skin tension and temporary reduction in blood supply during the bulging state result in a deeper and more thorough freezing effect, making it particularly suitable for patients with excessively thick lesions.

[0047] In summary, doctors only need to pull the pull plate 7 to move the cannula 3 upwards and control the height of the stop block 34 by the moving rod 38 to precisely control the flow rate of liquid nitrogen through the funnel 32 to the lower pen body 4. This allows for personalized treatment needs based on the thickness and area of ​​different lesions, improving the adaptability of clinical operations. Furthermore, the upward movement of the cannula 3 creates negative pressure inside the piston cylinder 12, causing the transparent suction cup 5 to firmly adhere to the skin lesion, physically preventing liquid nitrogen from slipping onto the patient's normal skin and avoiding secondary frostbite. Crucially, when targeting thicker lesions, the increased displacement of the pull plate 7 allows the liquid nitrogen cryotherapy pen to expel more liquid nitrogen while simultaneously increasing the negative pressure within the piston cylinder 12. This enables the pen to slightly lift the patient's skin lesions, reducing skin tension and blood supply, thus enhancing the freezing depth and therapeutic effect. This is particularly suitable for stubborn, thick skin lesions, achieving precise control of nitrogen expulsion and efficient cryotherapy. It also solves the problems of fixed nitrogen expulsion volume and lack of protection during use associated with traditional cryotherapy pens.

[0048] Furthermore, a heater 28 is fixedly installed on the surface of the lower pen body 4. A temperature display panel 17 is provided on the surface of the heater 28. A control button 18 and a control button 29 are provided on the surface of the heater 28. An air inlet pipe and a connecting pipe 21 are fixedly connected to the surface of the heater 28. An arc-shaped housing 23 is fixedly installed on the surface of the lower pen body 4. The end of the connecting pipe 21 away from the heater 28 is fixedly connected to the arc-shaped housing 23. A one-way valve 3 20 is provided on the surface of the connecting pipe 21.

[0049] The inner wall of the arc-shaped housing 23 is slidably connected to a movable plate 57. Two symmetrically arranged movable rods 22 are fixedly connected to the surface of the movable plate 57. The ends of the two movable rods 22 extending out of the arc-shaped housing 23 are fixedly connected to a pressure plate 26. A spring 4 25 is provided between the pressure plate 26 and the arc-shaped housing 23. A heating tube 15 is fixedly connected between the arc-shaped housing 23 and the transparent suction cup 5. A one-way valve 4 24 and a valve 16 are provided on the surface of the heating tube 15.

[0050] More specifically, in this embodiment: after liquid nitrogen cryotherapy, the pen tip is prone to forming ice crystals that adhere to the frozen necrotic tissue due to the low temperature. Forcibly separating them may cause tissue tearing or severe pain to the patient. After the existing liquid nitrogen cryotherapy pen is used, doctors usually need to leave the pen tip in the air for a while to wait for the ice crystals to melt naturally, or wipe it with a cotton swab. This operation is inconvenient and inefficient.

[0051] like Figure 1 , Figure 2 , Figure 8 and Figure 9As shown, after pulling the pull plate 7 once to discharge an appropriate amount of liquid nitrogen and complete the cryotherapy of the patient's skin lesion, press the control button 18 to start the heater 28. At the same time, open the valve 16 on the heating tube 15 and press the pressure plate 26 repeatedly. Since the flow direction of the one-way valve 20 on the surface of the connecting pipe 21 is from the heater 28 to the arc-shaped housing 23, and the flow direction of the one-way valve 24 on the surface of the heating tube 15 is from the arc-shaped housing 23 to the heating tube 15, similarly, as the pressure plate 26 moves back and forth in the arc-shaped housing 23, the air heated by the heater 28 can be drawn into the arc-shaped housing 23 through the connecting pipe 21 and discharged into the transparent suction cup 5 through the heating tube 15. This can heat the patient's lesion skin and the pen tip 6 after cryotherapy, so as to melt the ice crystals formed between the pen tip 6 and the frozen necrotic tissue. This realizes the automated processing after the cryotherapy is completed, improving the convenience of using the liquid nitrogen cryotherapy pen and the patient's comfort.

[0052] It should be noted that while pressing the pressure plate 26 repeatedly to inject hot air into the transparent suction cup 5, the air outlet pipe 46 is sealed. Therefore, as hot air is injected into the transparent suction cup 5, the piston plate 14 will be pushed to move upward in the piston cylinder 12. As the piston plate 14 moves, the piston rod 51 and the connecting block 13 will move upward synchronously until the connecting block 13 abuts against the second abutment block 11. This indicates that the transparent suction cup 5 is filled with hot air. After waiting for half a minute, the ice crystals formed between the pen tip 6 and the frozen necrotic tissue will melt. Then, the sealing block 48 on the air outlet pipe 46 can be removed, and the hot air can be discharged through the air outlet pipe 46. At the same time, the negative pressure in the transparent suction cup 5 will be released. At this time, the pen tip 6 can be removed from the lesion on the patient's skin. Thus, one liquid nitrogen cryotherapy is completed.

[0053] In summary, by adding a heater 28, after treatment, the heated air can be injected into the transparent suction cup 5 by repeatedly pressing the pressure plate 26 to gently rewarm the lesion area and the pen tip 6, allowing the ice crystals to melt quickly and safely, avoiding secondary damage and pain to the patient caused by physical tearing, and significantly improving treatment comfort. At the same time, the hot air injection process can also push the piston plate 14 to move upward in the piston cylinder 12. By observing the position change of the connecting block 13, the air injection status can be intuitively indicated, avoiding burns to the patient caused by continuous hot air injection. This solves the clinical problem of the pen tip 6 and frozen necrotic tissue sticking together due to low temperature after cryotherapy, and the easy tearing or severe pain caused by forced separation. It simplifies the doctor's operation process and improves the efficiency of diagnosis and treatment. The transparent suction cup 5 is made of medical-grade transparent silicone, which has good flexibility and biocompatibility, making it easy to observe the skin condition of the adsorption area.

[0054] It should be noted that the parts that come into direct contact with liquid nitrogen, such as funnel 32, stop block 34, spring 42, moving rod 38, sealing plug 29, pen tip 6, etc., are all made of low-temperature resistant materials, such as 304 stainless steel, polytetrafluoroethylene (PTFE) or low-temperature resistant rubber.

[0055] Working Principle: This is a dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal. In use: Position the pen tip 6 against the lesion on the patient's skin, ensuring the transparent suction cup 5 is in contact with the skin at the lesion site. Pull the pull plate 7 upwards. Through the coordinated action of multiple mechanisms, the stop block 34 moves upwards, disengaging it from the funnel 32. The greater the upward displacement of the pull plate 7, the higher the stop block 34 is lifted. As the height of the stop block 34 by the moving rod 38 increases, the space between the stop block 34 and the funnel 32 becomes larger, allowing more liquid nitrogen to pass through the stop block 34 and the funnel 32. The space between the buckets 32 flows into the inner cavity of the lower pen body 4, thereby controlling the amount of liquid nitrogen discharged by the liquid nitrogen cryotherapy pen. The discharged liquid nitrogen flows through the gap between the barrier ball 58 and the opening of the pen tip 6 to the lesion on the patient's skin. After the liquid nitrogen cryotherapy pen is left to stand for a period of time, the cryotherapy on the patient's skin lesion can be completed. For patients with more severe skin lesions, it is necessary to increase the upward displacement of the pull plate 7 to discharge more liquid nitrogen for cryotherapy on the patient's skin lesion. As the upward displacement of the pull plate 7 increases, the piston plate 14 will be positioned within the piston cylinder 1. The increased upward movement within 2 allows the piston cylinder 12 to transmit stronger negative pressure to the transparent suction cup 5. This strong negative pressure within the transparent suction cup 5 can lift and bulge the patient's lesion skin, bringing the liquid nitrogen outflow point closer to the base of the lesion. In this bulging state, skin tension increases and blood supply is temporarily reduced, resulting in a deeper and more thorough freezing effect. This is especially suitable for patients with thick lesions. After liquid nitrogen cryotherapy, the pen tip and the frozen necrotic tissue are prone to adhesion due to the low temperature. Forcible separation may cause tissue tearing, leading to severe pain for the patient. Pressing control button 18 activates heater 28. Simultaneously, valve 16 is opened and pressure plate 26 is pressed repeatedly to expel heated air into transparent suction cup 5. This heats the lesion skin and pen tip 6 of the patient after cryotherapy, melting the ice crystals that adhere between the pen tip 6 and the frozen necrotic tissue. This achieves automated processing after cryotherapy. After transparent suction cup 5 is filled with hot air, it is left to stand for half a minute. Then, the sealing block 48 is removed, and the hot air is discharged through the air outlet 46. At the same time, the negative pressure in transparent suction cup 5 is released. Then, the pen tip 6 is removed from the lesion on the patient's skin. Thus, liquid nitrogen cryotherapy is completed.

[0056] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A dermatologically controlled liquid nitrogen cryotherapy pen, comprising an upper pen body (1) and a lower pen body (4), characterized in that: The upper pen body (1) and the lower pen body (4) are fixedly connected by three fixed rods (35) arranged in a circular array. The surface of the upper pen body (1) is fixedly connected to a limiting block one (9), and the surface of the lower pen body (4) is fixedly connected to a limiting block two (27). The outer surfaces of the upper pen body (1) and the lower pen body (4) are slidably connected to a sleeve (3). The surface of the sleeve (3) is provided with a limiting groove (37) for the limiting block one (9) and the limiting block two (27) to slide and adapt. The upper surface of the upper pen body (1) is provided with a cover plate (2), and the lower surface of the cover plate (2) is fixedly connected to a sealing plug (29). The lower surface of the lower pen body (4) is fixedly connected to a pen tip (6), and the surface of the pen tip (6) is fixedly installed with a transparent suction cup (5). The sleeve (3) is provided with an auxiliary component for controlling the amount of liquid nitrogen discharged from the upper pen body (1); The lower pen body (4) is provided with an isolation component for sucking up the patient's lesion skin when the liquid nitrogen discharge from the upper pen body (1) is large.

2. The liquid nitrogen cryotherapy pen with controllable nitrogen removal for dermatology according to claim 1, characterized in that: The auxiliary component includes two symmetrically arranged fixing blocks (10) fixedly connected to the surface of the sleeve (3). The surfaces of the two fixing blocks (10) are fixedly connected to pull plates (7). The surface of the upper pen body (1) is slidably connected to a connecting ring (39). The ends of the two pull plates (7) are fixedly connected to the connecting ring (39). The surface of the pull plates (7) is fixedly connected to a slider (8).

3. The dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal according to claim 2, characterized in that: The surface of the upper pen body (1) is provided with a groove (40) for the slider (8) to extend and slide. A limiting rod (41) is fixedly connected to the inner wall of the groove (40). The limiting rod (41) passes through the slider (8) and is slidably connected to it. A spring (42) is provided between the slider (8) and the inner wall of the groove (40).

4. The dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal according to claim 3, characterized in that: A funnel (32) is fixedly connected to the surface of the upper pen body (1). A second sliding groove (30) is provided on the inner wall of the upper pen body (1). A first moving plate (31) is slidably connected to the inner wall of the second sliding groove (30). A connecting column (33) is fixedly connected to the lower surface of the first moving plate (31). A stop block (34) that fits against the funnel (32) is fixedly connected to the end of the connecting column (33). The inner wall of the sleeve (3) is fixedly connected to a support plate (36), and the surface of the support plate (36) is fixedly connected to a moving rod (38).

5. The dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal according to claim 1, characterized in that: The isolation component includes a piston cylinder (12) fixedly installed on the surface of the lower pen body (4). A piston plate (14) is slidably connected to the inner wall of the piston cylinder (12). A piston rod (51) is fixedly connected to the surface of the piston plate (14). A connecting block (13) is fixedly connected to the end of the piston rod (51) extending out of the piston cylinder (12). A spring (45) is provided between the connecting block (13) and the piston cylinder (12). An abutment block (44) and an abutment block (11) are fixedly connected to the surface of the sleeve (3).

6. The dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal according to claim 5, characterized in that: The piston cylinder (12) is fixedly connected to an air outlet pipe (46), and an elastic rope (47) is provided on the surface of the air outlet pipe (46). A sealing block (48) is fixedly connected to the end of the elastic rope (47). An air suction pipe (43) is fixedly connected to the surface of the piston cylinder (12), and the end of the air suction pipe (43) away from the piston cylinder (12) is fixedly connected to the transparent suction cup (5).

7. A dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal according to claim 6, characterized in that: The surface of the air outlet pipe (46) is provided with a one-way valve (49), and the surface of the air intake pipe (43) is provided with a one-way valve (50).

8. The dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal according to claim 1, characterized in that: The inner wall of the pen tip (6) is fixedly connected to a support plate two (54), and a limit rod two (53) is slidably connected to the surface of the support plate two (54). A blocking ball (58) is fixedly connected to the end of the limit rod two (53) away from the support plate two (54). A spring three (52) is provided between the blocking ball (58) and the support plate two (54). A rubber pad (55) is provided on the surface of the pen tip (6).

9. A dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal according to claim 1, characterized in that: A heater (28) is fixedly installed on the surface of the lower pen body (4). A temperature display panel (17) is provided on the surface of the heater (28). A control button one (18) and a control button two (19) are provided on the surface of the heater (28). An air inlet pipe and a connecting pipe (21) are fixedly connected to the surface of the heater (28). An arc-shaped housing (23) is fixedly installed on the surface of the lower pen body (4). The end of the connecting pipe (21) away from the heater (28) is fixedly connected to the arc-shaped housing (23). A one-way valve three (20) is provided on the surface of the connecting pipe (21).

10. A dermatological liquid nitrogen cryotherapy pen with controllable nitrogen removal according to claim 9, characterized in that: The inner wall of the arc-shaped shell (23) is slidably connected to a movable plate two (57). The surface of the movable plate two (57) is fixedly connected to two symmetrically arranged movable rods two (22). The ends of the two movable rods two (22) extending out of the arc-shaped shell (23) are fixedly connected to a pressure plate (26). A spring four (25) is provided between the pressure plate (26) and the arc-shaped shell (23). A heating tube (15) is fixedly connected between the arc-shaped shell (23) and the transparent suction cup (5). A one-way valve four (24) and a valve (16) are provided on the surface of the heating tube (15).

Images