Needle head front end temperature control cooling device and radio frequency microneedle instrument with needle head front end temperature control cooling device

Abstract

The invention relates to the technical field of medical cosmetology and skin repair instruments, and discloses a needle head front end temperature control cooling device and a radio frequency microneedle instrument with the needle head front end temperature control cooling device. The needle head front end temperature control cooling device comprises a shell which is provided with a containing cavity and an opening facing a to-be-treated part, and the opening is provided with a negative pressure bin facing the containing cavity; the negative pressure bin is further provided with a negative pressure through hole communicated with the negative pressure output device. The self-adaptive cold conduction assembly is arranged at the opening, the self-adaptive cold conduction assembly comprises first cold conduction pieces and second cold conduction pieces which are independent from each other, the second cold conduction pieces are arranged in a U shape, and the multiple second cold conduction pieces are arranged in a three-face surrounding mode in the direction away from the first cold conduction pieces; when the first cold conduction piece and the second cold conduction piece generate an axial displacement difference, a fit clearance is formed, the fit clearance is configured to form an airflow guide channel under the action of negative pressure, and condensate water on the surfaces of the first cold conduction piece and the second cold conduction piece is removed through airflow shear force.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical cosmetology and skin repair instruments, in particular to a needle tip front end temperature control cooling device and a radio frequency microneedle instrument with the same. BACKGROUND

[0002] The radio frequency microneedle technology emits radio frequency energy through microneedles penetrating into the dermis layer for treatment. In order to assist in needle insertion and protect the epidermis, the existing microneedle treatment head usually applies negative pressure to fix the skin and cooperates with a contact type cooling component.

[0003] However, the existing technology such as the microneedle treatment head and microneedle treatment device disclosed in Chinese patent document CN106821493A usually adopts a whole rigid cold plate cooperating with negative pressure adsorption. Under the action of negative pressure, the skin tissue is usually in a "dome-shaped" uplift after being stressed. The rigid flat cold plate can only contact the highest point (central area) of the uplift. Since the extension stroke of the microneedle is usually fixed relative to the rigid shell, if the degree of skin uplift is different, the actual depth of the microneedle located in the center penetrating into the dermis layer is usually greater than that of the edge microneedle, which is difficult to ensure the consistency of the treatment level of the whole array of microneedles.

[0004] In addition, after being in contact with the skin (wet) for a long time in a high humidity environment, the low-temperature metal contact end is easy to produce condensed water. Since the needle hole is open, the condensed water will accumulate at the needle hole. If the condensed water between the needle holes further converges, a "liquid bridge" will be formed between the adjacent microneedles. At the moment of radio frequency energy emission, the energy will conduct laterally along the low-impedance water film on the surface instead of vertically into the deep tissue. This uncontrolled energy will not only trigger the device protection shutdown, but also cause thermal damage to the skin surface layer in severe cases. SUMMARY

[0005] The present application aims to provide a needle tip front end temperature control cooling device and a radio frequency microneedle instrument with the same, which aims to solve the problems of poor rigidity of the cold plate and easy short circuit caused by condensed water in the prior art.

[0006] To achieve the above-mentioned purpose, the present application provides a needle tip front end temperature control cooling device, comprising: a shell having a containing cavity and an opening open to the treated part, the opening has a negative pressure chamber facing the containing cavity, and the negative pressure chamber is further provided with a negative pressure through hole for communicating with a negative pressure output device; further comprising:

[0007] An adaptive cold conduction component is arranged at the opening, the adaptive cold conduction component comprises a first cold conduction component and a second cold conduction component which are independent of each other, the second cold conduction component is arranged in a U shape, and a plurality of second cold conduction components are arranged in a three-sided surrounding ring in a direction away from the first cold conduction component;

[0008] Wherein, the first cold conducting element and the second cold conducting element generate axial displacement difference, forming a matching gap, the matching gap is configured to form an airflow guide channel under the action of negative pressure, and the airflow shear force is used to remove the condensed water on the surface of the first cold conducting element and the second cold conducting element.

[0009] Further, the airflow guide channel is arranged in a U-shaped structure along the shape of the second cold conducting element, and both ends of the airflow guide channel are arranged towards the negative pressure through hole.

[0010] Further, the first cold conducting element and the second cold conducting element are both arrayed with microneedle through holes for microneedles to pass through, and the surface of the first cold conducting element and the second cold conducting element towards the treatment site is further provided with annular flow guide grooves arranged at the outlets of the microneedle through holes, and the annular flow guide grooves are in communication with the matching gap.

[0011] Further, it further comprises:

[0012] A refrigeration output assembly is fixedly arranged in the shell, and the first cold conducting element and the second cold conducting element are connected with the cold end of the refrigeration output assembly through a flexible heat conducting connecting piece.

[0013] Further, it further comprises:

[0014] A differential suspension system is arranged to float the first cold conducting element and the second cold conducting element in the accommodating cavity along the axial direction, and the differential suspension system comprises a first elastic member supporting the first cold conducting element and a second elastic member supporting the second cold conducting element, and the stiffness coefficient of the first elastic member is smaller than the stiffness coefficient of the second elastic member, so that the axial backward displacement amount of the first cold conducting element is greater than the axial backward displacement amount of the second cold conducting element.

[0015] Further, the flexible heat conducting connecting piece is a plurality of braided metal belts or a plurality of layers of flexible graphite heat conducting sheets, and the flexible heat conducting connecting piece connected with the first cold conducting element passes through the hollow area of the second cold conducting element and does not contact the second cold conducting element.

[0016] Further, the negative pressure chamber surrounds the second cold conducting element.

[0017] Further, the surface of the first cold conducting element and the second cold conducting element towards the treatment site is provided with an insulating coating.

[0018] The application further provides a radio frequency microneedle instrument, comprising:

[0019] The needle head front end temperature control cooling device as described above;

[0020] A microneedle assembly comprising a microneedle base and a plurality of microneedles fixed on the microneedle base by a micro spring seat;

[0021] A driving mechanism for driving the microneedle assembly to move axially;

[0022] A stopper arranged on the surface of the first and second cold conductive members facing away from the treatment site and corresponding to the inlet of each microneedle through hole;

[0023] A stopper block arranged on the microneedle and configured to abut against the stopper block after displacement when the microneedle protrudes to a preset length, and the micro spring seat absorbs the remaining stroke.

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

[0025] 1. The present application utilizes the difference in stiffness coefficient between the first and second elastic members, so that the cooling assembly can automatically reconstruct into a stepped concave surface under negative pressure adsorption according to the stress distribution of the skin protrusion, effectively reducing the air gap between the cold plate and the edge of the protruding skin, and improving the cooling uniformity.

[0026] 2. The present application utilizes the cooperation gap formed by the split structure under displacement difference as an airflow guide channel. In a negative pressure environment, the airflow increases in speed when flowing through the gap, and the generated airflow shear force can blow away and separate the condensate water around the needle hole, thereby reducing the risk of forming a conductive liquid bridge between adjacent microneedles and improving the safety of the treatment process.

[0027] 3. The present application realizes depth control of the microneedle by mechanical abutment of the stop structure on the microneedle assembly with the back of the cold conductive member after displacement of the skin, which is based on the real-time contact with the skin surface, and cooperates with the buffer energy absorption link in the driving link, which helps to ensure the uniformity of the penetration depth of the full array microneedle. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0029] Figure 1 A schematic view of a needle head front end temperature control cooling device structure of the present application;

[0030] Figure 2 A Figure 1 Enlarged view of reference sign A;

[0031] Figure 3 Front view of self-adaptive cold conduction assembly in needle front end temperature control cooling device of the present application;

[0032] Figure 4 For Figure 3 Enlarged view of reference sign B;

[0033] Figure 5 For Figure 3 Sectional view at C-C.

[0034] In the figure: 10. housing; 11. accommodating cavity; 12. opening; 13. negative pressure bin; 14. negative pressure through hole; 15. self-adaptive cold conduction assembly; 16. first cold conduction part; 17. second cold conduction part; 18. fit gap; 19. microneedle; 20. microneedle through hole; 21. refrigeration output assembly; 22. microneedle assembly; 23. microneedle base; 24. micro spring seat; 25. stop; 26. stop ring; 27. annular flow guide groove; 28. air flow guide channel. DETAILED DESCRIPTION

[0035] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0036] Embodiment:

[0037] Please refer to Figures 1 to 5 The present application provides a needle front end temperature control cooling device, mainly applied to the front handle of a radio frequency microneedle treatment device. The device includes a housing 10, the housing 10 inside which forms an accommodating cavity 11, and the front end is provided with an opening 12 open to the treatment site (i.e. the skin surface). A negative pressure bin 13 is provided at the opening 12 towards the accommodating cavity 11, which communicates with an external negative pressure source (not shown in the figure) through a negative pressure through hole 14, for adsorbing and fixing the skin during treatment.

[0038] As Figure 2 and Figure 3 shown, a self-adaptive cold conduction assembly 15 is provided at the opening 12. The assembly adopts a split design, including a first cold conduction part 16 (central cold island) and a second cold conduction part 17 (peripheral cold ring) independent of each other. In this embodiment, the second cold conduction part 17 is arranged in a U shape, and two second cold conduction parts 17 are arranged in a three-sided surrounding ring away from the first cold conduction part 16. Of course, the number of second cold conduction parts 17 can be set according to actual use requirements, and the second cold conduction part 17 located at the outermost periphery can be used as a support to prevent axial displacement difference.

[0039] In order to achieve adaptive fitting to the skin bulging state, the differential suspension system is introduced in the present application. As shown in the figure, the first cold conducting element 16 and the second cold conducting element 17 are respectively installed in the accommodating cavity 11 in the axial direction by the first elastic element and the second elastic element (not shown in the figure, which can be springs or elastic sheets). The key design of the present embodiment is that the stiffness coefficient (k1) of the first elastic element is smaller than the stiffness coefficient (k2) of the second elastic element. Figure 5

[0040] The working principle is as follows: when the negative pressure is turned on, the skin bulges in a dome shape under the action of suction. Due to the large central normal force of the skin and the softness of the first elastic element, the first cold conducting element 16 will produce a large axial backward displacement; while the edge force is small and the second elastic element is hard, the second cold conducting element 17 remains in place or only produces a small amount of backward movement. Thus, the axial displacement difference between the first cold conducting element 16 and the second cold conducting element 17 is generated, so that the surface of the cold conducting assembly is reconstructed into a stepped concave surface that matches the skin dome, thereby eliminating the edge air gap.

[0041] As shown in the figure, when the first cold conducting element 16 and the second cold conducting element 17 produce a displacement difference, a fitting gap 18 is formed between them. The airflow guide channel 28 is structurally embodied as a groove structure extending along the fitting gap 18. Figure 5

[0042] It is particularly worth mentioning that in the present embodiment, both ends of the airflow guide channel 28 are arranged towards the negative pressure through hole 14 and are in communication with the negative pressure source. This layout does not cause airflow stagnation, but is to build a "bidirectional confluence" and "homogeneous adsorption" flow field architecture.

[0043] The specific fluid mechanics mechanism is as follows: the airflow guide channel 28 is not a closed transmission pipeline, but a laterally open distributed air intake system. The driving pressure difference of the airflow flow 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 fitting gap 18 (atmosphere / skin contact environment).

[0044] In the working state, due to the non-absolute sealing of the skin texture and the physical steps generated by the floating of the cold conducting element, the air with higher pressure from the outside will be laterally rolled into the airflow guide channel 28 along the full length range of the fitting gap 18 at a very high flow rate. According to the principle of fluid continuity, these airflows constantly entering from the middle and both sides of the U-shaped structure will be quickly divided after entering the channel, and will flow at high speed in the direction of the two end heads with the smallest resistance, and finally converge into the negative pressure through hole 14.

[0045] ​​This "full-length lateral air intake, bidirectional air exhaust" mode has significant technical advantages: on the one hand, it ensures the uniformity of the negative pressure adsorption force in the entire U-shaped cold conduction element area, preventing the distal skin from peeling off due to single-end suction; on the other hand, it significantly shortens the air flow exhaust path, eliminates the distal air flow dead zone that may be caused by single-end suction, and ensures that the air flow shear force can efficiently cover the entire interface edge, thereby thoroughly removing the condensed water.

[0046] As shown in Figure 4 The first cold conduction element 16 and the second cold conduction element 17 are both arrayed with microneedle through holes 20 for the microneedles 19 to pass through. On the surface facing the treatment site, the annular flow guide grooves 27 are arranged in a spaced manner (for example, in a chessboard or plum blossom stake staggered distribution). Specifically, the annular flow guide grooves 27 are only arranged on the periphery of part of the microneedle through holes 20, and each annular flow guide groove 27 is in fluid communication with the matching gap 18.

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

[0048] On the one hand, it ensures the effective contact area between the cold conduction element and the skin. Because the efficiency of contact cooling is highly dependent on the physical contact area between the metal cold plate and the skin. If flow guide grooves are arranged on the periphery of all microneedle through holes 20, the flat area of the cold conduction element surface will be greatly reduced, leading to an increase in thermal contact resistance. This embodiment ensures that the cold conduction element and the skin maintain sufficient close-fitting surface by retaining flat and groove-free structure around part of the microneedle through holes 20, thereby ensuring efficient cooling of the epidermis during treatment.

[0049] On the other hand, it constructs a physical mechanism to block the conductive liquid bridge. The occurrence of radio frequency short circuit depends on the formation of a continuous low impedance liquid film (i.e. conductive liquid bridge) between adjacent microneedle electrodes. This embodiment adopts a hierarchical blocking strategy: first, for the liquid bridge risk between the first cold conduction element 16 and the second cold conduction element 17, it is mainly physically blocked by the aforementioned axial displacement difference and the air flow shear effect at the matching gap 18; second, for the liquid bridge risk between adjacent microneedle through holes 20 within the same cold conduction element (such as the first cold conduction element 16), the spaced arrangement structure is used to destroy the continuity of the liquid film. The specific principle is: even if a small amount of condensed water accumulates at the microneedle through hole where no flow guide groove is arranged, the condensed water at this place will be quickly removed by the negative pressure air flow and remain dry due to the annular flow guide groove 27 connected to the negative pressure at the adjacent through hole. Due to the fact that the two adjacent points cannot simultaneously meet the wet condition, this "one dry and one wet" discontinuous state physically cuts off the path of lateral conduction of electric current, thereby effectively preventing the occurrence of creeping arc short circuit within the microneedle array.

[0050] AsFigure 1 As shown, a refrigeration output assembly 21 is also provided in the housing 10, which is connected to the first and second cold conductors through flexible heat-conductive connectors (e.g. multi-strand woven metal belt) to accommodate the floating displacement thereof.

[0051] The present embodiment also provides a radio frequency microneedle device, which further comprises a microneedle assembly 22. As shown, Figure 1 and Figure 2 As shown, the microneedle 19 is floatingly fixed to the microneedle base 23 through a micro spring seat 24. A stopper 25 is provided at the back of the cold conductor, and an adjustable position stop ring 26 is provided on the microneedle 19. During treatment, when the microneedle is extended to the preset length, the stop ring 26 mechanically abuts against the stopper 25 which has retreated with the skin. At this time, the depth of the microneedle relative to the surface of the cold plate (i.e. the surface of the skin) is locked, and the remaining stroke is absorbed by the micro spring seat 24. This mechanism ensures the physical normalization of the microneedle penetration depth.

[0052] Obviously, the above-mentioned embodiments are only examples for the purpose of clarity, and are not intended to limit the embodiments. Based on the above description, those skilled in the art can make other different forms of changes or variations. Here, it is not necessary and impossible to exhaust all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A needle tip temperature control and 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). When the first cold conductor (16) and the second cold conductor (17) have an axial displacement difference, a fitting gap (18) is formed. The fitting gap (18) is configured to form an airflow guiding channel (28) under negative pressure, and the airflow shear force is used to remove the condensate on the surface of the first cold conductor (16) and the second cold conductor (17).

2. A needle tip temperature control and cooling device 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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