A needle tip temperature control and cooling device and a radiofrequency microneedle device equipped with the same.

Abstract

This invention relates to the field of medical aesthetics and skin repair devices. The invention discloses a needle tip temperature control and cooling device and a radiofrequency microneedle device equipped with the same. The needle tip temperature control and cooling device includes a housing with a receiving cavity and an opening facing the treatment area. A negative pressure chamber is located at the opening facing the receiving cavity, and the negative pressure chamber also has a negative pressure through-hole for communication with a negative pressure output device. It also includes an adaptive cold conduction component disposed at the opening. The adaptive cold conduction component includes independent first and second cold conduction components. The second cold conduction components are U-shaped, and several second cold conduction components are arranged in a three-sided arrangement away from the first cold conduction component. When the first and second cold conduction components have an axial displacement difference, a fitting gap is formed. This fitting gap is configured to form an airflow channel under negative pressure, using airflow shear force to remove condensate from the surfaces of the first and second cold conduction components.

Description

Technical Field

[0001] This invention relates to the field of medical aesthetics and skin repair device technology, specifically to a needle tip temperature control and cooling device and a radiofrequency microneedle device equipped with the same. Background Technology

[0002] Radiofrequency microneedling technology delivers treatment by inserting microneedles into the dermis to deliver radiofrequency energy. To assist needle insertion and protect the epidermis, existing microneedling heads typically apply negative pressure to stabilize the skin and are used in conjunction with contact cooling components.

[0003] However, existing technologies, such as the microneedle treatment head and microneedle treatment device disclosed in Chinese patent document CN106821493A, typically employ an integral rigid cooling plate combined with negative pressure adsorption. Under negative pressure, the skin tissue usually bulges in a "dome" shape after being stressed. The rigid flat cooling plate can often only contact the highest point of the bulge (the central area). Since the extension stroke of the microneedles is usually fixed relative to the rigid shell, if the degree of skin bulging is uneven, the actual depth of penetration into the dermis by the microneedles in the center is often greater than that of the microneedles at the edges, making it difficult to ensure the consistency of the treatment layers of the entire array of microneedles.

[0004] Furthermore, in high-humidity clinical environments or after prolonged skin contact (moistening), condensation easily forms on the low-temperature metal contact tip. Since the needle holes are open, condensation accumulates at these points. If this condensation further accumulates between needle holes, it can form "liquid bridges" between adjacent microneedles. At the moment of radiofrequency energy emission, the energy is conducted laterally along the low-resistivity water film on the surface, rather than penetrating vertically into deeper tissues. This energy runaway can not only trigger the device's protective shutdown but, in severe cases, can cause thermal damage to the skin's surface. Summary of the Invention

[0005] The purpose of this invention is to provide a temperature control and cooling device for the tip of a needle and a radio frequency microneedle instrument equipped with the same, in order to solve the problems of poor adhesion of rigid cold plates and short circuits caused by condensation in the prior art.

[0006] To achieve the above objectives, the present invention provides a needle tip temperature control and cooling device, comprising: a housing having a receiving cavity and an opening facing the treatment site, wherein a negative pressure chamber is provided at the opening facing the receiving cavity, and the negative pressure chamber is further provided with a negative pressure through hole for communication with a negative pressure output device; and further comprising:

[0007] An adaptive cold conduction component is disposed at the opening. The adaptive cold conduction component includes a first cold conduction element and a second cold conduction element that are independent of each other. The second cold conduction element is arranged in a U-shape, and a plurality of the second cold conduction elements are arranged in a three-sided arrangement around the first cold conduction element in a direction away from the first cold conduction element.

[0008] When the first cold conductor and the second cold conductor have an axial displacement difference, a fitting gap is formed. The fitting gap is configured to form an airflow guiding channel under negative pressure, and the airflow shear force is used to remove the condensate on the surface of the first cold conductor and the second cold conductor.

[0009] Furthermore, the airflow guiding channel is configured as a U-shaped structure along the shape of the second cold conduction component, with both ends of the airflow guiding channel facing the negative pressure through hole.

[0010] Furthermore, both the first and second cold conductive components are provided with arrayed microneedle through holes for microneedles to pass through. The surfaces of the first and second cold conductive components facing the treatment area are also provided with annular guide grooves. The annular guide grooves are arranged at intervals at the outlet of the microneedle through holes and are connected to the mating gap.

[0011] Furthermore, it also includes:

[0012] A cooling output component is fixedly disposed within the housing, and the first and second cold conduction components are connected to the cold end of the cooling output component via a flexible thermally conductive connector.

[0013] Furthermore, it also includes:

[0014] A differential suspension system is configured to axially floatably mount a first cold conductor and a second cold conductor within the accommodating cavity, the differential suspension system including a first elastic member supporting the first cold conductor and a second elastic member supporting the second cold conductor, the stiffness coefficient of the first elastic member being less than that of the second elastic member, such that the axial backward displacement of the first cold conductor is greater than that of the second cold conductor.

[0015] Furthermore, the flexible thermal conductive connector is a multi-strand braided metal strip or a multi-layer flexible graphite thermal conductive sheet; wherein the flexible thermal conductive connector connecting the first cold conductive component passes through the hollow area of ​​the second cold conductive component and does not contact the second cold conductive component.

[0016] Furthermore, the negative pressure chamber is arranged around the second cold conduction element.

[0017] Furthermore, the surfaces of the first and second cold conductive elements facing the treatment area are provided with an insulating coating.

[0018] The present invention also provides a radiofrequency microneedle device, comprising:

[0019] The needle tip temperature control and cooling device described above;

[0020] A microneedle assembly includes a microneedle base and a plurality of microneedles fixed to the microneedle base by micro spring seats;

[0021] A drive mechanism is used to drive the microneedle assembly to move axially;

[0022] A stop portion is provided on the surface of the first and second cold conductive components facing away from the treatment area, and corresponds to the inlet of each of the microneedle holes;

[0023] A stop ring is disposed on the microneedle and configured such that when the microneedle extends to a preset length, the stop ring abuts against the stop portion after displacement, and the micro spring seat absorbs the remaining stroke.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. This invention utilizes the difference in stiffness coefficient between the first elastic element and the second elastic element to enable the cooling component to automatically reconstruct a stepped concave surface according to the force distribution of the skin bulge under negative pressure adsorption, effectively reducing the air gap between the cold plate and the edge of the bulging skin and improving cooling uniformity.

[0026] 2. This invention utilizes the fitting gap formed by the split structure under displacement difference as an airflow guiding channel. In a negative pressure environment, the airflow velocity increases when flowing through this gap, and the generated airflow shear force can blow away and remove the condensate around the needle hole, thereby reducing the risk of conductive liquid bridges forming between adjacent microneedles and improving the safety of the treatment process.

[0027] 3. This invention achieves fixed-depth needle insertion based on the real-time contact with the skin surface by mechanically contacting the stop structure on the microneedle assembly with the back of the cold conduction component after the skin displacement. Combined with the buffer energy absorption link in the drive link, it helps to ensure the uniformity of the insertion depth of the entire array of microneedles. Attached Figure Description

[0028] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a needle tip temperature control and cooling device according to the present invention;

[0030] Figure 2 for Figure 1 Enlarged view of number A;

[0031] Figure 3 This is a front view of the adaptive cold conduction component in a needle tip temperature control and cooling device according to the present invention;

[0032] Figure 4 for Figure 3 Enlarged view of number B;

[0033] Figure 5 for Figure 3 Sectional view at point CC.

[0034] In the figure: 10. Shell; 11. Receiving cavity; 12. Opening; 13. Negative pressure chamber; 14. Negative pressure through hole; 15. Adaptive cold conduction component; 16. First cold conduction component; 17. Second cold conduction component; 18. Fitting clearance; 19. Microneedle; 20. Microneedle through hole; 21. Cooling output component; 22. Microneedle assembly; 23. Microneedle base; 24. Miniature spring seat; 25. Stop part; 26. Stop ring; 27. Annular guide groove; 28. Airflow guide channel. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0036] Example:

[0037] Please see Figures 1 to 5 This invention provides a needle tip temperature control and cooling device, mainly used in the front handle of a radiofrequency microneedle therapy device. The device includes a housing 10, with a cavity 11 formed inside the housing 10, and an opening 12 at the front end facing the treatment area (i.e., the skin surface). A negative pressure chamber 13 is provided in the area facing the cavity 11 at the opening 12. This negative pressure chamber 13 is connected to an external negative pressure source (not shown in the figure) through a negative pressure through-hole 14, and is used to adsorb and fix the skin during treatment.

[0038] like Figure 2 and Figure 3 As shown, an adaptive cold conduction component 15 is provided at the opening 12. This component adopts a split design, including an independent first cold conduction element 16 (central cold island) and a second cold conduction element 17 (outer cold ring). In this embodiment, the second cold conduction element 17 is U-shaped, and the two second cold conduction elements 17 surround the first cold conduction element 16 on three sides. Of course, the number of second cold conduction elements 17 can be set according to actual usage requirements, and the outermost second cold conduction element 17 can act as a support to prevent axial displacement differences.

[0039] To achieve adaptive fit to skin bulges, this invention introduces a differential suspension system. For example... Figure 5 As shown, the first cold conductive element 16 and the second cold conductive element 17 are axially floatably installed in the accommodating cavity 11 via a first elastic element and a second elastic element (not shown in the figure, which may be a spring or a sheet). The key design feature of this embodiment is that the stiffness coefficient (k1) of the first elastic element is smaller than the stiffness coefficient (k2) of the second elastic element.

[0040] Its working principle is as follows: When the negative pressure is turned on, the skin bulges into a dome shape under the suction. Due to the large normal thrust at the center of the skin and the relatively soft first elastic element, the first cold conduction element 16 will produce a large axial backward displacement; while the edge thrust is small and the second elastic element is relatively hard, the second cold conduction element 17 remains in place or only produces a slight backward displacement. As a result, an axial displacement difference is generated between the first cold conduction element 16 and the second cold conduction element 17, causing the surface of the cold conduction assembly to be reconstructed into a stepped concave surface that matches the dome of the skin, thereby eliminating the edge air gap.

[0041] The aforementioned displacement difference is also used to construct the active dehumidification structure. For example... Figure 5 As shown, when the first cold conduction component 16 and the second cold conduction component 17 have a displacement difference, a fitting gap 18 is formed between them. The airflow guiding channel 28 is structurally manifested as a groove structure extending along the fitting gap 18.

[0042] It is worth noting that in this embodiment, both ends of the airflow guiding channel 28 are oriented towards the negative pressure through hole 14 and are connected to the negative pressure source. This arrangement does not cause airflow stagnation, but rather aims to construct a flow field architecture of "bidirectional convergence" and "homogeneous adsorption".

[0043] The specific fluid dynamics mechanism is as follows: the airflow guiding channel 28 is not a closed transmission pipeline, but a laterally open distributed air intake system. The driving pressure difference for airflow is not generated between the two ends of the channel, but between the inside of the channel (negative pressure environment) and the outside of the mating gap 18 (atmosphere / skin contact environment).

[0044] In operation, due to the non-absolute sealing of the skin texture and the physical steps created by the floating of the cold conduction components, high-pressure air from the outside will be laterally drawn into the airflow guide channel 28 at extremely high velocity along the entire length of the mating gap 18. According to the principle of fluid continuity, these airflows continuously entering from the middle and sides of the U-shaped structure will quickly split after entering the channel and flow at high speed towards the two ends with the least resistance, eventually converging into the negative pressure through hole 14.

[0045] This "full-length lateral air intake and bidirectional split exhaust" mode has significant technical advantages: on the one hand, it ensures the uniform distribution of negative pressure adsorption force throughout the entire U-shaped cold conduction component area, preventing distal skin peeling caused by single-end suction; on the other hand, it significantly shortens the airflow exhaust path, eliminates the distal airflow dead zone that may be caused by single-end suction, and ensures that the airflow shear force can efficiently cover the entire boundary edge, thereby thoroughly removing condensate.

[0046] like Figure 4 As shown, both the first cold conductive element 16 and the second cold conductive element 17 have arrayed microneedle through-holes 20 for the microneedles 19 to pass through. On the surface facing the treatment area, the annular guide grooves 27 are arranged in a spaced-out manner (e.g., in a checkerboard or staggered pattern). Specifically, the annular guide grooves 27 are only provided around the outlet periphery of some of the microneedle through-holes 20, and each annular guide groove 27 is in fluid communication with the mating gap 18.

[0047] Specifically, the above-mentioned spaced arrangement structural design aims to balance thermal conductivity stability and electrical safety, and the specific principle is as follows:

[0048] On the one hand, it ensures the effective contact area between the cooling conductor and the skin. This is because the efficiency of contact cooling is highly dependent on the physical contact area between the metal cold plate and the skin. If guide grooves were provided around the exit periphery of all microneedle holes 20, the flat area on the surface of the cooling conductor would be significantly reduced, leading to increased contact thermal resistance. This embodiment ensures sufficient close contact between the cooling conductor and the skin by maintaining a flat, groove-free structure around some of the microneedle holes 20, thereby guaranteeing efficient cooling of the epidermis during treatment.

[0049] On the other hand, a physical mechanism for blocking conductive liquid bridges was constructed. The occurrence of radio frequency short circuits depends on the formation of a continuous low-impedance liquid film (i.e., a conductive liquid bridge) between adjacent microneedle electrodes. This embodiment employs a graded blocking strategy: First, for the risk of liquid bridges between the first cold conductive element 16 and the second cold conductive element 17, physical isolation is mainly achieved through the aforementioned axial displacement difference and the airflow shearing effect at the fitting gap 18; Second, for the risk of liquid bridges between adjacent microneedle vias 20 within the same cold conductive element (such as the first cold conductive element 16), the continuity of the liquid film is disrupted using the aforementioned spacing arrangement structure. Specifically, even if a small amount of condensate accumulates at a microneedle via without a flow channel, the condensate at the adjacent via is rapidly drawn away by the negative pressure airflow, remaining dry. Since adjacent points cannot simultaneously meet the wetting conditions, this discontinuous state of "one dry, one wet" physically cuts off the path of lateral current conduction, thereby effectively preventing creepage short circuits within the microneedle array.

[0050] like Figure 1 As shown, the housing 10 is also equipped with a cooling output component 21, which is connected to the first and second cooling conduction components through a flexible heat-conducting connector (such as a multi-strand braided metal strip) to accommodate its floating displacement.

[0051] This embodiment also provides a radiofrequency microneedle device, which further includes a microneedle assembly 22. For example... Figure 1 and Figure 2 As shown, the microneedle 19 is floatingly fixed to the microneedle base 23 via a micro-spring seat 24. A stop 25 is provided on the back of the cold conduction element, and an adjustable stop ring 26 is provided on the microneedle 19. During treatment, when the microneedle extends a preset length, the stop ring 26 mechanically abuts against the stop 25, which has retracted with the skin. At this time, the depth of the microneedle relative to the cold plate surface (i.e., the skin surface) is locked, and the remaining travel is absorbed by the micro-spring seat 24. This mechanism ensures the physical normalization of the microneedle insertion depth.

[0052] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A needle tip bevel temperature control cooling device, comprising: The housing (10) has a receiving cavity (11) and an opening (12) facing the treatment site, wherein the opening (12) has a negative pressure chamber (13) facing the receiving cavity (11), and the negative pressure chamber (13) is further provided with a negative pressure through hole (14) for communication with a negative pressure output device; characterized in that it further includes: An adaptive cold conduction component (15) is disposed at the opening (12). The adaptive cold conduction component (15) includes a first cold conduction element (16) and a second cold conduction element (17) that are independent of each other. A plurality of second cold conduction elements (17) are arranged in a three-sided arrangement around the first cold conduction element (16) in a direction away from the first cold conduction element (16). The first cold conduction element (16) and the second cold conduction element (17) are respectively axially floatably installed in the accommodating cavity (11) through a first elastic element and a second elastic element. The stiffness coefficient of the first elastic element is smaller than that of the second elastic element. When the first cold conductor (16) and the second cold conductor (17) have an axial displacement difference, a fitting gap (18) is formed between them. The fitting gap (18) itself constitutes an airflow guiding channel (28) under negative pressure. The airflow guiding channel (28) is configured as a full-length lateral air intake and bidirectional split air intake airway structure, using airflow shear force to remove condensate from the surfaces of the first cold conductor (16) and the second cold conductor (17).

2. A device for thermally conditioning the tip of a hypodermic needle according to claim 1, characterized in that The airflow guiding channel (28) is configured as a U-shaped structure along the shape of the second cold conduction component (17), and both ends of the airflow guiding channel (28) are set towards the negative pressure through hole (14).

3. A needle tip temperature control and cooling device according to claim 1, characterized in that, The first cold conductor (16) and the second cold conductor (17) are both arrayed with microneedle through holes (20) for microneedles (19) to pass through. The surfaces of the first cold conductor (16) and the second cold conductor (17) facing the treatment site are also provided with annular guide grooves (27). The annular guide grooves (27) are arranged at intervals at the outlet of the microneedle through holes (20). The annular guide grooves (27) are connected to the mating gap (18).

4. A needle tip temperature control and cooling device according to claim 1, characterized in that, Also includes: Cooling output assembly (21) is fixedly disposed inside the housing (10). The first cold conduction component (16) and the second cold conduction component (17) are connected to the cold end of the cooling output assembly (21) through a flexible heat-conducting connector.

5. A needle tip temperature control and cooling device according to claim 1, characterized in that, Also includes: A differential suspension system is configured to axially floatably mount the first cold conductor (16) and the second cold conductor (17) in the accommodating cavity (11), the differential suspension system including a first elastic member supporting the first cold conductor (16) and a second elastic member supporting the second cold conductor (17), the stiffness coefficient of the first elastic member being less than the stiffness coefficient of the second elastic member, such that the axial backward displacement of the first cold conductor (16) is greater than the axial backward displacement of the second cold conductor (17).

6. A needle tip temperature control and cooling device according to claim 4, characterized in that, The flexible thermal conductive connector is a multi-strand braided metal strip or a multi-layer flexible graphite thermal conductive sheet; wherein the flexible thermal conductive connector connecting the first cold conductive component (16) passes through the hollow area of ​​the second cold conductive component (17) and does not contact the second cold conductive component (17).

7. A needle tip temperature control and cooling device according to claim 1, characterized in that, The negative pressure chamber (13) is arranged around the second cold conduction element (17).

8. A needle tip temperature control and cooling device according to claim 1, characterized in that, The surfaces of the first and second cold conductive elements facing the treatment area are provided with an insulating coating.

9. A radiofrequency microneedle device, characterized in that, include: The needle tip temperature control and cooling device as described in any one of claims 1 to 8; The microneedle assembly (22) includes a microneedle base (23) and a plurality of microneedles (19) fixed to the microneedle base (23) by a micro spring seat (24). A drive mechanism is used to drive the microneedle assembly (22) to move axially; The stop part (25) is provided on the surface of the first cold conductor (16) and the second cold conductor (17) facing away from the treatment site, and corresponds to the inlet of each of the microneedle through holes (20); A stop ring (26) is adjustablely disposed on the microneedle (19) and configured such that when the microneedle (19) extends to a preset length, the stop ring (26) abuts against the stop portion (25) after displacement, and the micro spring seat (24) absorbs the remaining stroke.

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