Needle structure and handpiece for applying high-frequency energy to treatment tissue

Abstract

The utility model discloses a needle structure and a handpiece for applying high-frequency energy to a treatment tissue, and relates to the technical field of medical instruments, the needle structure comprises a conductive plate, a hollow needle and a temperature sensor; the hollow needle comprises a cylindrical needle body and a tip, the needle body is inserted into the conductive plate, and the tip comprises at least one first tangent plane; the temperature sensor is arranged in the hollow needle, and at least part of the temperature sensor is exposed out of the hollow needle through the first tangent plane; according to the technical scheme, the experience of a patient can be improved.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a needle structure and handheld device for applying high-frequency energy to therapeutic tissues. Background Technology

[0002] High-frequency point sculpting is an invasive radiofrequency heating technology widely used in the beauty industry. It delivers radiofrequency energy deep into the treated tissue, stimulating collagen production and remodeling to achieve firming, wrinkle reduction, and improved skin texture. Due to its safety and effectiveness, this technology has become an important means of anti-aging and shaping for the face, neck, and other parts of the body. High frequency refers to radiofrequency pulse energy with frequencies exceeding 1000Hz.

[0003] In related technologies, radiofrequency treatment handpieces deliver radiofrequency energy after minimally invasive insertion through a solid needle. However, existing solid needles are usually designed as tapered shapes that gradually taper to a point. Due to the small size of the radiofrequency dot-carving invasive microneedles, it is impossible to install contact temperature sensors on the needle body, making it difficult to monitor treatment parameters such as the real-time heating temperature of the microneedle-invasive treatment tissue. This makes it difficult to reasonably control the output of radiofrequency energy. Utility Model Content

[0004] The main purpose of this invention is to provide a radiofrequency therapy handpiece designed to improve the patient's experience.

[0005] To achieve the above objectives, the present invention proposes a needle structure for applying high-frequency energy to therapeutic tissue, comprising:

[0006] conductive plate;

[0007] A hollow needle, comprising a cylindrical needle body and a tip, the needle body being inserted into the conductive plate, and the tip including at least one first slit; and

[0008] A temperature sensor is disposed inside the hollow needle, and the temperature sensor is at least partially exposed outside the hollow needle via the first cross-section.

[0009] In one embodiment, the tip further includes at least a second slit and at least a third slit; the first slit, the second slit, and the third slit are not coplanar, and at least two of them form a cone shape at the tip position.

[0010] In one embodiment, along the length of the hollow needle, the first cut surface is disposed closer to the needle body, and the second cut surface and the third cut surface are respectively disposed on opposite sides of the first cut surface.

[0011] In one embodiment, the angle between the first cut surface and the axis of the needle body is α, where 10°≤α≤12°;

[0012] The angle between the second cut surface and the first cut surface is β, where 38°≤β≤42°;

[0013] The angle between the third cut surface and the first cut surface is γ, where 38°≤γ≤42°.

[0014] In one embodiment, the temperature sensor includes a detection end disposed within the tip and exposed outside the hollow needle via the first cut surface.

[0015] In one embodiment, the radiofrequency treatment handle further includes a first insulating tube housed within the hollow needle, and the detection end passes through the first insulating tube.

[0016] In one embodiment, the radiofrequency treatment handpiece further includes a second insulating tube and a third insulating tube, both of which are housed within the first insulating tube;

[0017] The detection end includes a first conductive wire and a second conductive wire. One of the first conductive wire and the second conductive wire is inserted through the second insulating tube, and the other is inserted through the third insulating tube. The two ends of the first conductive wire are respectively connected to the two ends of the second conductive wire to form a thermocouple circuit.

[0018] In one embodiment, the temperature sensor further includes a thermocouple supplement terminal, which is located at the end of the detection end away from the tip.

[0019] In one embodiment, the end of the detection end away from the housing is bonded to the inner wall of the receiving channel.

[0020] This invention also proposes a handheld device for applying high-frequency energy to therapeutic tissue, comprising a needle structure as described above for applying high-frequency energy to therapeutic tissue. The handheld device further comprises a display window and a circuit board electrically connected to the temperature sensor. The circuit board is used to detect the temperature data of the temperature sensor and transmit it to the display window for real-time display.

[0021] In this invention, a conductive plate transmits high-frequency energy to a hollow needle, which is then inserted into the treatment skin to apply the high-frequency energy for treatment. The tip of the hollow needle has a first slit, forming a conical ridge between the first slit and its adjacent surface. This conical ridge reduces resistance during the needle's penetration into the treatment tissue and also acts as a guide. This first slit reduces resistance during penetration, minimizing damage to the treatment tissue and improving the patient's experience. Furthermore, a portion of the temperature sensor extends through the first slit of the hollow needle, allowing for real-time monitoring of the temperature near the tip, ensuring optimal treatment effectiveness.

[0022] The tip has a conical ridge formed at the junction of any two adjacent cut surfaces. This conical ridge acts like a "blade" during the hollow needle's penetration into the treatment tissue. The conical ridge is set at an acute angle to the axial direction of the hollow needle, allowing it to be relatively long and improving sharpness. It also serves as a guide. The multiple conical ridges reduce the resistance encountered by the hollow needle during penetration, correspondingly reducing the force applied by the operator. This facilitates needle insertion and reduces damage to the treatment tissue, improving the patient's experience. Furthermore, a temperature sensor for measuring the temperature of the treatment tissue is installed within the hollow needle. At least part of the temperature sensor is exposed outside the hollow needle via the first cut surface of the tip, allowing it to contact the treatment tissue for temperature measurement, thus improving the accuracy of temperature measurement. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0024] Figure 1 An exploded view of an embodiment of the handheld device for applying high-frequency energy to therapeutic tissue provided by this utility model;

[0025] Figure 2 A schematic diagram (partial structure) of an embodiment of a handheld device for applying high-frequency energy to therapeutic tissue provided by this utility model;

[0026] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0027] Figure 4 A cross-sectional view of an embodiment of the handheld device for applying high-frequency energy to therapeutic tissue provided by this utility model;

[0028] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle.

[0029] Explanation of icon numbers:

[0030] 1000. Handheld device for applying high-frequency energy to therapeutic tissue; 1. Housing; 11. Display window; 2. Hollow needle; 21. Needle body; 22. Tip; 221. First cut surface; 222. Second cut surface; 223. Third cut surface; 3. Circuit board; 4. Detection end; 41. First conductive wire; 42. Second conductive wire; 5. First insulating tube; 6. Second insulating tube; 7. Third insulating tube; 8. Thermocouple supplementary end; 9. Fixing base.

[0031] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0033] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0035] This invention proposes a needle structure for applying high-frequency energy to therapeutic tissues.

[0036] Please see Figures 1 to 3 In one embodiment of the present invention, the needle structure includes a conductive plate, a hollow needle 2, and a temperature sensor; the hollow needle 2 includes a cylindrical needle body 21 and a tip 22, the needle body 21 is inserted into the conductive plate, and the tip 22 includes at least one first cross-section 221; the temperature sensor is disposed inside the hollow needle 2, and the temperature sensor is at least partially exposed outside the hollow needle 2 through the first cross-section 221.

[0037] The conductive plate is electrically connected to the high-frequency energy source inside the main body and transmits the high-frequency energy to the hollow needle 2. The hollow needle 2 is used to insert into the interior of the treatment object and emit radio frequency energy, thereby performing radio frequency therapy.

[0038] It should be noted that the first cut surface 221 is the surface formed by cutting during the production of the hollow needle 2. That is, the first cut surface 221 is not limited to a plane, so that the first cut surface 221 can be connected with other surfaces to form a conical edge, or it can be a curved surface.

[0039] Understandably, high-frequency energy source treatments include various methods, such as radiofrequency ablation of fat and pigmentation, stimulation of collagen production, and destruction of apocrine gland cells to treat underarm odor. Different treatment purposes require different treatment temperatures. By setting up a temperature sensor and exposing part of the temperature sensor structure outside the hollow needle 2 through the first cut surface, this part of the structure can directly contact the treatment tissue after the hollow needle 2 minimally invasively invades the treatment tissue, making temperature detection more accurate.

[0040] In this invention, a conductive plate transmits high-frequency energy to a hollow needle 2, which is then inserted into the treatment tissue to apply the high-frequency energy for treatment. The tip 22 of the hollow needle 2 has a first cut surface 221. This first cut surface 221 forms a penetration ridge with the adjacent surface. This penetration ridge acts like a "blade" during the minimally invasive treatment process, while also serving as a guide. This first cut surface 221 reduces the resistance experienced by the hollow needle 2 during minimally invasive treatment, correspondingly reducing the force applied by the operator. This minimizes damage to the treatment tissue and improves the patient's experience. Furthermore, a portion of the temperature sensor structure is exposed outside the hollow needle 2 through the first cut surface 221, allowing for real-time monitoring of the temperature near the tip 22 and ensuring treatment effectiveness.

[0041] A conical ridge is formed at the junction of any two adjacent cut surfaces. This conical ridge acts like a "blade" during the minimally invasive treatment with the hollow needle 2. The conical ridge forms an acute angle with the axial direction of the hollow needle 2, allowing it to be relatively long, increasing sharpness, and also serving a guiding function. The multiple conical ridges reduce the resistance encountered by the hollow needle 2 during minimally invasive treatment, correspondingly reducing the penetration force. This minimizes damage to the treated tissue and improves the patient's experience. Furthermore, because the cut surfaces are not coplanar, the contact points between the tip 22 and the treated tissue during minimally invasive treatment are distributed on different planes, reducing pressure in one direction and making the microneedle application process smoother for the operator.

[0042] Specifically, in one embodiment of this utility model, please refer to Figure 3 The tip 22 further includes at least a second cut surface 222 and at least a third cut surface 223; the first cut surface 221, the second cut surface 222, and the third cut surface 223 are not coplanar, and at least two of them form a cone shape at the tip 22. The multiple cut surfaces correspond to more conical ridges, which can better reduce the resistance encountered by the hollow needle 2 during minimally invasive treatment, correspondingly reducing the application force. This reduces damage to the treated tissue and improves the patient's experience. Furthermore, the non-coplanar arrangement of the multiple cut surfaces ensures that the contact points between the tip 22 and the treated tissue are distributed on different planes during minimally invasive treatment, reducing pressure in one direction and making the application of the microneedle smoother, further reducing damage to the treated skin and improving the patient's experience.

[0043] Further, in an embodiment of the present utility model, along the length direction of the hollow needle 2, the first cutting surface 221 is closer to the needle body 21, and the second cutting surface 222 and the third cutting surface 223 are respectively arranged on opposite sides of the first cutting surface 221. That is, along the extension direction of the hollow needle 2, the first cutting surface 221, the second cutting surface 222, and the third cutting surface 223 are in a "pin" - shaped structure, where the first cutting surface 221 is closer to the needle body direction of the hollow needle. Thus, during the minimally invasive treatment of the hollow needle 2, when minimally invasive treatment of the surface of the treatment tissue is first performed by the conical edges formed by the connection of the second cutting surface 222 with other surfaces of the tip 2 and the conical edges formed by the connection of the third cutting surface 223 with other surfaces of the tip 22, the tip 22 penetrates into the treatment tissue. Then, under the guidance of the conical edge formed by the connection of the first cutting surface 221 with other surfaces of the tip 22, the needle body 21 can smoothly penetrate into the treatment tissue. Among them, the conical edges formed by the second cutting surface 222 and the third cutting surface 223 are more numerous, that is, there are more conical edges acting during the process of the tip 22 penetrating into the treatment tissue, which helps to reduce the resistance suffered by the hollow needle 2 during minimally invasive treatment, correspondingly reducing the force applied by the operator to the micro - needle, reducing the damage to the treatment tissue, and improving the patient experience; on this basis, only a small number of conical edges formed by the first cutting surface 221 can smoothly guide the needle body 21 to penetrate into the treatment tissue. In addition, the second cutting surface 222 and the third cutting surface 223 are not coplanar, which can also make the penetration force of the tip 22 stronger and the minimally invasive treatment process smoother. In addition, the "pin" - shaped structure enables the second cutting surface 222 and the third cutting surface 223 to contact the treatment tissue in two directions simultaneously, which helps the hollow needle 2 to maintain stability during the minimally invasive treatment process. In other embodiments, the first cutting surface 221, the second cutting surface 222, and the third cutting surface 223 may also be linearly arranged or spirally arranged, or more cutting surfaces may be provided.

[0044] In an embodiment of the present utility model, please refer to Figure 3 , the second cutting surface 222 and the third cutting surface 223 are symmetrically arranged about the center line of the first cutting surface 221. The symmetric cutting surface design makes the tip 22 more balanced during penetration treatment, reducing the possibility of deflection, thereby improving the accuracy of penetration treatment. And the symmetric arrangement of the second cutting surface 222 and the third cutting surface 223 makes the force distribution on the tip 22 relatively uniform when penetrating into the tissue, thereby reducing the damage to the treatment tissue and improving the patient experience. In addition, while the second cutting surface 222 and the third cutting surface 223 are symmetric about the axis of the needle body 21, they can be set to be symmetric about the central axis of the first cutting surface 221. In this way, the first cutting surface 221 can better guide the needle body 21 to smoothly penetrate into the treatment tissue.

[0045] Furthermore, the angle between the first cut surface 221 and the axis of the needle body 21 is set as α, 10°≤α≤12°; the angle between the second cut surface 222 and the first cut surface 221 is set as β, 38°≤β≤42°; and the angle between the third cut surface 223 and the first cut surface 221 is set as γ, 38°≤γ≤42°. The sizes of these angles correspond to the inclination of the first cut surface 221, the second cut surface 222, and the third cut surface 223. Among them, the first cut surface 221, as the transition surface between the tip 22 and the needle body 21, needs to be relatively gentle, so the value of α will be smaller to make the transition smoother. During the process of hollow needle 2 penetrating the skin, the cone-shaped edge formed by the second cut surface 222 and the third cut surface 223 is used for penetration treatment first. When the tip 22 penetrates for treatment, the second cut surface 222 and the third cut surface 223 need to have a larger inclination angle to make the penetration power of the tip 22 stronger and the minimally invasive treatment process smoother. In one embodiment of this utility model, α is 11°, and β and γ are both 40°. However, β and γ cannot be too large, that is, the tilt angles of the second cut surface 222 and the third cut surface 223 cannot be too large. If the tilt angles of the second cut surface 222 and the third cut surface 223 are too large, the length of the corresponding tip 22 will be too small. This will increase the difficulty of hollow needle invasive treatment, thus requiring greater application force and making it easier to cause damage to the treated tissue, affecting the patient's experience.

[0046] For higher detection accuracy, please refer to one embodiment of this utility model. Figure 1 , Figure 4 and Figure 5 The temperature sensor includes a detection end 4, which is disposed within the tip 22 and exposed outside the hollow needle 2 via a first cut surface 221. By exposing the detection end 4 outside the hollow needle 2, it can directly contact the treated tissue, enabling real-time temperature detection. This allows for increased radiofrequency energy output when the temperature is lower than expected, ensuring treatment effectiveness, and timely reduction of radiofrequency energy output when the temperature is higher than expected, avoiding burns and unnecessary tissue damage, thus improving treatment safety.

[0047] For safety reasons, please refer to one embodiment of this utility model. Figure 5It also includes a first insulating tube 5, which is housed within the hollow needle 2, and the detection end 4 passes through the first insulating tube 5. The first insulating tube 5 provides insulation between the detection end 4 and the hollow needle 2, ensuring that there is no direct electrical connection between them, preventing short circuits or electrical interference, and thus ensuring safety during the treatment process. The first insulating tube 5 is made of PI (polyimide) material, an excellent electrical insulator that ensures good electrical isolation between the temperature sensor's detection end 4 and the hollow needle 2. Furthermore, PI tubes have excellent high-temperature resistance, remaining stable in the high-temperature environment generated during radiofrequency treatment without deformation or damage due to high temperatures.

[0048] Furthermore, in one embodiment of this utility model, please refer to... Figure 5 The device also includes a second insulating tube 6 and a third insulating tube 7, both housed within the first insulating tube 5. The detection end 4 includes a first conductive wire 41 and a second conductive wire 42. One of the first conductive wire 41 and the second conductive wire 42 passes through the second insulating tube 6, and the other passes through the third insulating tube 7. The two ends of the first conductive wire 41 are connected to the two ends of the second conductive wire 42 to form a thermocouple circuit. Thermocouples are highly sensitive to temperature changes and can accurately detect minute temperature variations in the treatment area. Thus, the thermocouple circuit formed by the first conductive wire 41 and the second conductive wire 42 provides high-precision temperature measurement, ensuring accuracy. Furthermore, placing the first conductive wire 41 and the second conductive wire 42 within the second insulating tube 6 and the third insulating tube 7 respectively reduces mutual interference between them, ensuring the stability of the temperature measurement. The first conductive wire 41 and the second conductive wire 42 can also be pre-assembled with the second insulating tube 6 and the third insulating tube 7, facilitating subsequent overall assembly of the device. The two ends of the first conductive wire 41 and the two ends of the second conductive wire 42 are exposed at the two ends of the second insulating tube 6 and the two ends of the third insulating tube 7, respectively, to form a thermocouple circuit. The first conductive wire 41 and the second conductive wire 42 are two different metal wires, and the connection method is preferably welding to ensure a stable connection. The second insulating tube 6 and the third insulating tube 7 are made of PI (polyimide) tubes. PI material is an excellent electrical insulator, ensuring good electrical isolation between the detection end 4 of the temperature sensor and the hollow needle 2. At the same time, PI tubes have excellent high-temperature resistance, remaining stable in the high-temperature environment generated during radiofrequency treatment without deformation or damage due to high temperatures.

[0049] To improve measurement accuracy, please refer to one embodiment of this utility model. Figure 4The temperature sensor also includes a thermocouple supplement terminal 8, which is located at the end of the sensing end 4 furthest from the tip. The thermocouple supplement terminal 8 can provide cold junction compensation for the sensing end 4, reducing the influence of ambient temperature on the sensing end 4 and ensuring the accuracy of temperature measurement by the sensing end 4.

[0050] In this embodiment, the inner and outer diameters of the hollow needle 2 are designed with reference to the size of medical injection needles (the outer diameter of the hollow needle is about 0.3mm-0.4mm, and the inner diameter is about 0.18mm-0.22mm). At the same time, under the premise of safety and reliability, the inner diameter is increased as much as possible to facilitate the assembly of thermocouple wires. The first insulating tube 5 is a PI tube with an inner diameter of 0.12mm, and the second insulating tube 6 and the third insulating tube 7 are PI tubes with an inner diameter of 0.05mm.

[0051] Furthermore, in one embodiment of this utility model, please refer to... Figure 4 It also includes a fixing base 9, through which the hollow needle 2 is inserted. The fixing base 9 can prevent the hollow needle 2 from shaking during treatment, thereby ensuring the treatment effect of the radiofrequency treatment handpiece 1000. The fixing base 9 is made of insulating material.

[0052] To improve structural stability, in one embodiment of this invention, the detection end 4 is bonded to the inner wall of the tip 22. Bonding ensures that the detection end 4 is fixed in position within the tip 22, preventing displacement during operation, enhancing the overall structural stability of the hollow needle 2, and guaranteeing the accuracy and consistency of measurements. The adhesive used for bonding is selected from those with high thermal conductivity and chemical and biological safety, such as silicone rubber or polydimethylsiloxane.

[0053] Please see Figure 1This utility model also proposes a handheld device 1000 for applying high-frequency energy to treated tissues. The handheld device 1000 includes the aforementioned needle structure for applying high-frequency energy to treated tissues. The specific structure of the needle structure is as described in the above embodiments. Since this handheld device 1000 adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here. The handheld device 1000 also includes a display window 11 electrically connected to a temperature sensor and a circuit board 3. The display window 11 receives and displays the temperature data detected by the circuit board 3 in real time. The circuit board 3 is used to electrically connect the temperature sensor to form a temperature measurement circuit. Specifically, the electronic components in the circuit board 3 can measure the thermoelectric potential difference between the thermocouple compensation end 8 and the detection end 4 in the thermocouple circuit and then convert it into temperature data. Of course, the circuit board 3 also has other functions for controlling the treatment operation of the handheld device 1000, which will not be elaborated here. The display window 11 can display key parameters during the treatment process in real time, such as temperature and energy output. Through the data provided by the display window 11, the operator can precisely control the output of radio frequency energy to ensure the accuracy and effectiveness of the treatment. The handheld device 1000 also includes a housing 1, a display window 11 is disposed on the housing 1, a conductive plate, a circuit board 38, a thermocouple supplementary end, and a fixing base 9 are all disposed inside the housing 1, and a hollow needle 2 is disposed at one end inside the housing 1 and at the other end extends out of the housing 1 to different preset depths to invade the target tissue at different depths for radiofrequency treatment of the tissue.

[0054] In the embodiments of this invention, the non-coplanar first cut surface 221, second cut surface 222, and third cut surface 223 improve the patient's experience. During minimally invasive treatment, the tip 22 of the hollow needle 2 first penetrates the treatment area through the conical ridge formed by the second cut surface 222 and the third cut surface 223 with a larger tilt angle. Then, guided by the conical ridge formed by the first cut surface 221 with a smaller tilt angle, the needle body 21 of the hollow needle 2 smoothly penetrates the treatment tissue. This process requires less force from the operator and causes less damage to the treatment tissue. Furthermore, during treatment, a thermocouple-type detection end 4 is provided inside the tip 22 of the hollow needle 2, which can monitor the temperature in real time. This allows for increased radiofrequency energy output when the temperature is lower than expected to ensure treatment effectiveness, and timely reduction of radiofrequency energy output when the temperature is higher than expected to avoid burns and unnecessary tissue damage, thus improving the safety of the treatment.

[0055] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A needle structure for applying high frequency energy to a treatment tissue, characterized by, The needle structure comprises: a conductive plate; a hollow needle comprising a needle body and a tip, the needle body is inserted into the conductive plate, the tip comprises at least a first facet; and a temperature sensor is arranged in the hollow needle, the temperature sensor is at least partially exposed outside the hollow needle through the first facet.

2. The needle structure of claim 1, wherein, The tip further comprises at least a second facet and at least a third facet; the first facet, the second facet and the third facet are arranged non-coplanarly, and at least two of them form a taper at the position of the tip.

3. The needle structure of claim 2, wherein, Along the length direction of the hollow needle, the first facet is arranged closer to the needle body, and the second facet and the third facet are arranged on the opposite sides of the first facet respectively.

4. The needle structure of claim 2, wherein, The included angle between the first facet and the axis of the needle body is α, 10°≤α≤12°; The included angle between the second facet and the first facet is β, 38°≤β≤42°; The included angle between the third facet and the first facet is γ, 38°≤γ≤42°.

5. The needle structure of claim 1, wherein The temperature sensor comprises a detection end, which is arranged in the tip and exposed outside the hollow needle through the first facet.

6. The needle structure of claim 5, wherein, Further comprising a first insulating tube, which is arranged in the hollow needle, and the detection end is arranged in the first insulating tube.

7. The needle structure of claim 6, wherein Further comprising a second insulating tube and a third insulating tube, both of which are arranged in the first insulating tube; The detection end comprises a first conductive wire and a second conductive wire, one of which is arranged in the second insulating tube, and the other is arranged in the third insulating tube, and the two ends of the first conductive wire are connected to the two ends of the second conductive wire to form a thermocouple loop.

8. The needle structure of claim 7, wherein, The temperature sensor further comprises a thermocouple complementary end, which is arranged at the end of the detection end away from the tip.

9. The needle structure of claim 5, wherein, The detection end is bonded to the inner wall of the tip.

10. A handpiece for applying high frequency energy to a treatment tissue, characterized by, The handpiece comprises the needle structure for applying high-frequency energy to the treatment tissue as claimed in any one of claims 1-9, and further comprises a display window and a circuit board electrically connected to the temperature sensor, the circuit board is used for detecting the temperature data of the temperature sensor and transmitting to the display window for real-time display.

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