Needle tip for applying current

Abstract

To provide a needle tip to apply an electric current that can transmit electric energy only to a skin site positioned at a specific depth.SOLUTION: The needle tip includes a cylinder 610 adhering to skin, a plunger 323 that is reciprocally movable in the cylinder 610, and at least one needle that is opposed to the skin and coupled to the plunger 623. The needle includes a first insulating region formed by coating an end part with an insulator, and an active region that is formed on the needle in at least one region excluding the first insulating region and is electromagnetically energized.SELECTED DRAWING: Figure 10

Description

[Technical Field]

[0001] The present invention relates to a needle tip for applying electric current, a handpiece, and a skin treatment device, which are provided with a needle having an active region formed therein, whereby a portion of the needle except for the distal end is non-insulated and thereby electromagnetically conductive. [Background technology]

[0002] Generally, the skin serves as a primary barrier, protecting against environmental influences such as sun, cold, wind, etc. As we age, environmental influences cause the skin to lose its vital appearance and wrinkles appear.

[0003] Human skin is composed of the epidermis, which is 100 μm thick, the underlying dermis, which extends up to 4 mm from the skin, and finally the subcutaneous layer. These three layers determine the overall appearance of the skin. The dermis is composed of elastin collagen, glycosaminoglycans, and proteoglycans. The subcutaneous layer has vertical fibrous bands that cross this layer and connect the dermal collagen to the subcutaneous layer. Collagen fibers provide stiffness and elasticity to the skin.

[0004] However, collagen can lose its elasticity due to aging and exposure to sunlight, causing people to lose their youthful, firm appearance. Therefore, many methods for revitalizing skin have been proposed. Generally, skin treatment methods for treating various scars or skin diseases, or for cosmetic purposes such as skin improvement or wrinkle reduction, involve applying various energy sources to the affected area to coagulate the tissue. For example, methods that transmit thermal energy are widely known.

[0005] These methods involve applying various energies to the target area of the skin to intentionally induce wounds, stimulating the collagen in the dermis and inducing collagen regeneration, thereby regenerating the skin. According to research papers, collagen denaturation is most reliably induced at temperatures between 65℃ and 75℃.

[0006] 1, conventionally, an insulated needle 10 shown in FIG. 1(a) or a non-insulated needle 30 shown in FIG. 1(b) has been inserted into the epidermis 21 and dermis 22 of the skin 20 to apply electrical (RF) energy to the treatment area of the skin 20. However, due to the tendency of electrical energy to concentrate at the sharp end, both the insulated needle 10, whose entire body except for the distal end 12 is coated with an insulator 11, and the non-insulated needle 30 tend to concentrate electrical energy around the distal end. This has led to the problem of excessive lacerations occurring only in the area of the skin 20 where the distal end is located.

[0007] Furthermore, the insulated needle 10 has the problem that it can transmit electrical energy only to the skin 20 where the distal end 12 is located, and cannot transmit electrical energy to the skin 20 located on the sides of the needle.

[0008] Furthermore, since the entire area 31 of the non-insulated needle 30 is not coated with an insulator, electrical energy can be transmitted to the sides of the needle, but transmitting electrical energy to all surfaces that the needle is in contact with increases the overall energy, which can lead to excessive energy. As mentioned above, the non-insulated needle 30 also has the problem of electrical energy concentrating at the distal end, which can cause unnecessary pain.

[0009] Furthermore, the non-insulated needle 30 has the problem that it cannot transmit electrical energy only to a specific depth in the skin 20, and cannot treat only the skin 20 corresponding to a specific target depth by transmitting electrical energy to all parts where the needle is inserted. Summary of the Invention [Problem to be solved by the invention]

[0010] The present invention has been made in consideration of the above circumstances, and its purpose is to provide a current-applying needle tip, handpiece, and skin treatment device that can transmit electrical energy only to skin areas located at different depths in order to treat specific skin, without damaging skin tissue to an unnecessary extent.

[0011] Another object of the present invention is to provide a needle tip for applying electric current, a handpiece and a skin treatment device that prevent electrical energy from concentrating at the distal end of the needle.

[0012] The problems to be solved by the present invention are not limited to those mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0013] A needle tip for applying electric current according to one embodiment of the present invention includes a needle fixing portion and a plurality of needles arranged on one side of the needle fixing portion, each of which includes at least one active area that is electromagnetically conductive and is formed by not coating an insulator in a portion of the area except for the end portion, and the plurality of needles are connected to electrodes of alternately different polarities.

[0014] In another embodiment, when the plurality of needles includes a plurality of active areas spaced apart from one another, electrical energy is transmitted between the plurality of spaced apart active areas by adjusting the intensity of the current applied to each electrode connected to the plurality of needles.

[0015] Furthermore, in another embodiment, the device further includes a casing that contacts the skin surface to form a first space between the skin surface and the needle fixing portion, and the needle fixing portion moves to insert and eject the needle into and from the skin surface, and the first space is characterized in that negative pressure is formed before the needle is inserted into the skin surface.

[0016] In another embodiment, the needle tip is connected to a handpiece that moves the needle fixing part, and the position of the electromagnetically energized active area of the multiple needles on the skin surface is determined by controlling the drive part within the handpiece.

[0017] In yet another embodiment, the needles each include one or more electromagnetically energized active areas of the same size at a uniform location other than the distal end, and the needle tips are configured to generate tissue heating at the depth at which the active areas are located as the needles are inserted into the skin surface.

[0018] In another embodiment, the plurality of needles include a plurality of active areas of the same size at the same position other than the distal end, and the needle tip is characterized in that, when the needle is inserted into the skin surface and a current of a certain intensity or greater is applied, electromagnetic field tissue heating is generated throughout the area where the plurality of electromagnetically energized active areas are located and the area between the plurality of electromagnetically energized active areas.

[0019] In another embodiment, among the plurality of needles, a needle adjacent to a needle connected to an electrode of (+) polarity is connected to an electrode of (-) polarity.

[0020] A skin treatment device according to another embodiment of the present invention includes a casing for suctioning a target area on the skin surface, a plurality of needles disposed inside the casing, a needle fixing portion into which the plurality of needles are inserted and fixed, a control portion for controlling the operation of the casing and the plurality of needles, an electrical energy transmission portion electrically connected to the plurality of needles for transmitting electrical energy, and an electrical energy generation portion for generating electrical energy that is transmitted to the plurality of needles via the electrical energy transmission portion.

[0021] In addition, a method for manufacturing a needle tip for applying current according to another embodiment of the present invention includes the steps of providing a conductive material of a thickness that will form an electromagnetically conductive active region corresponding to a non-insulated portion, connecting a plurality of needles to a needle fixing portion, inserting the plurality of needles into the conductive material up to the position of the plurality of needles where the electromagnetically conductive active region is to be formed, and injecting an insulating material while the plurality of needles are inserted into the conductive material to form an end portion and an insulating region. [Effects of the Invention]

[0022] The present invention as described above has the following various effects.

[0023] The present invention also allows the needle to transmit electrical energy only to a skin site located at a specific depth of the skin by means of an electromagnetically energized active area, thereby preventing damage to skin tissue to an unnecessary extent.

[0024] Furthermore, the present invention allows for the simultaneous transfer of electrical energy to each of the skin sites adjacent to the active areas by forming multiple electromagnetically energized active areas on the needle.

[0025] Additionally, the present invention allows for the adjustment of the depth into the skin at which the active area of the needle can be placed by adjusting the length of the needle inserted into the skin.

[0026] Furthermore, the present invention can prevent the electrical energy from concentrating at the distal end of the needle, thereby preventing unnecessary pain for the skin patient and improving the efficiency of the electrical energy.

[0027] Furthermore, the present invention transmits electrical energy only to the depth of the skin where treatment is required, thereby preventing unnecessary tissue heating in the skin area and preventing waste of electrical energy. [Brief explanation of the drawings]

[0028] [Figure 1]FIG. 1 shows a needle used in an existing skin treatment device. [Figure 2] 1 is an exploded perspective view of a skin treatment device according to one embodiment of the present invention; [Figure 3] 3 is a cross-sectional view of the skin treatment device shown in FIG. 2. [Figure 4] 1 illustrates a needle according to one embodiment of the present invention. [Figure 5] FIG. 10 illustrates the polarity arrangement of needles according to one embodiment of the present invention. [Figure 6] 10A and 10B illustrate electrical energy delivered to the skin by needles according to one embodiment of the present invention. [Figure 7] 1A and 1B are diagrams showing needles suitable for different skin depths according to an embodiment of the present invention. [Figure 8] 10A and 10B are diagrams illustrating the electrical energy transmission effect of a needle according to one embodiment of the present invention. [Figure 9] 1 is a perspective view of a handpiece according to an embodiment of the present invention; [Figure 10] 1 is a cross-sectional view of a needle tip for applying electric current according to an embodiment of the present invention. [Figure 11] 10 is a cross-sectional view showing a pumping effect generated when a needle tip for applying current according to an embodiment of the present invention is operated. DETAILED DESCRIPTION OF THE INVENTION

[0029] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Advantages and features of the present invention, as well as methods for achieving them, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, and can be realized in a variety of different forms. However, these embodiments are provided to complete the disclosure of the present invention and to allow those skilled in the art to fully understand the scope of the present invention, and the present invention is only defined by the scope of the claims. The same reference symbols throughout the specification refer to the same elements.

[0030] Unless otherwise defined, all terms (including technical and scientific terms) used in this specification are used in the sense that they can be commonly understood by a person having ordinary skill in the art to which the present invention belongs. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless they are clearly and specifically defined.

[0031] The terms used in this specification are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular includes the plural unless otherwise specified. As used in the specification, "comprises" and / or "comprising" does not exclude the presence or addition of one or more other elements other than the elements mentioned.

[0032] Figure 2 is an exploded perspective view of a skin treatment device according to one embodiment of the present invention, and Figure 3 is a cross-sectional view of the skin treatment device shown in Figure 2.

[0033] 2 and 3, a skin treatment device according to an embodiment of the present invention may include a casing 120, a needle 110, a driving unit 140, an electricity providing unit 150, a connector 160, a cartridge 170, and a connecting member 180.

[0034] In one embodiment, the cartridge 170 is a needle tip for applying current, and may be connected to the driving unit 140 and may include a needle fixing unit and the needle 110. The cartridge 170 also serves to contact the skin surface from which the needle protrudes and is inserted. For example, in order to insert the needle after flattening the skin surface, the cartridge 170 may have a flat surface and a plurality of holes in the path along which the needle 110 moves so that the needle 110 can protrude.

[0035] In another embodiment, the cartridge 170 serves to define the skin area into which the needle 110 is inserted. The cartridge 170 is formed only as a wall that defines the area into which the needle is inserted, and thus serves to aspirate the target area on the skin surface when the needle 110 is inserted. This solves the problem of the active area of the needle 110 not being positioned accurately due to pressure being applied to the skin surface when the needle 110 is inserted, and raises the target area so that the needle 110 can be inserted with the skin surface flat.

[0036] In one embodiment, after the surface of the cartridge 170 is adhered to the skin, the cartridge 170 adjusts the pressure directly inside or switches the inside of the cartridge 170 (i.e., the space between the skin surface and the needle fixing part) to a negative pressure state by moving the needle fixing part, and since the inside of the cartridge 170 in a vacuum state is negative pressure, the skin is sucked up and the target area to be treated rises.

[0037] In one embodiment, the surface of cartridge 170 (i.e., the area that comes into contact with the skin surface) is made of rubber or silicone material so that it can adhere closely to the target area of the skin, and the cross section of cartridge 170 is preferably circular or polygonal, but since an important function is to easily suck up the target area, the cross section of the suction part is not limited to circular or polygonal.

[0038] In one embodiment, the needle 110 is at least partially coated with an insulator and is inserted into the cartridge 170 and fixed to the cartridge 170. For example, the needle 110 forms a fine hole in the target site that rises due to negative pressure when the cartridge 170 converts the target site into a vacuum state.

[0039] In one embodiment, the needle 110 is sharpened and made of a hard, conductive material such as metal, or made of a silicon material. The needle 110 may be hollow or made of a non-conductive material plated with a conductive material, and at least a portion of the needle, including the distal end, may be coated with any one of a parylene coating, a Teflon coating, or a ceramic coating. Specific examples of coating a portion of the needle (specifically, a portion of the needle, including the distal end) will be described in detail below.

[0040] In one embodiment, the size of the microholes is the same as the diameter of the needle 110, and the depth varies depending on the insertion depth of the needle 110. Also, if the needle 110 inserted into the skin always comes out of the skin within a certain time, the risk of an accident is eliminated and pain is reduced.

[0041] In one embodiment, the needles 110 may be connected separately as positive and negative poles. That is, the needle tip may be bipolar, including both positive and negative pole needles. The arrangement of the positive and negative pole needles on the needle tip will be described later, as will the arrangement of the active areas of each needle.

[0042] In one embodiment, multiple needles may have the same number of electromagnetically energized active regions at the same location. For example, when multiple needles are inserted while the skin surface is maintained flat, one or more active regions in each needle may be provided at the same location, so that the active regions are positioned at the same depth below the skin surface and can provide electrical energy to a specific depth layer.

[0043] Furthermore, the multiple needles may include electromagnetically energized active regions at different positions. As an example, to compensate for the fact that the skin surface does not flatten when the needles are inserted into the skin surface but is pressed by the pressure applied by the needles, the positions of the active regions may vary depending on the two-dimensional (coplanar) placement positions of the needles. Specifically, considering that multiple needles may not be inserted to the same depth due to the skin surface being pressed when the needles are inserted into the skin surface, the positions of the active regions may be adjusted depending on the placement positions of the needles on the needle fixing portion so that energy is applied to the same depth from the skin surface after insertion. For example, because the central region of the needle fixing portion 170 is more likely to sag during needle insertion, the active regions of the needles placed in the central region of the needle fixing portion 170 may be positioned closer to the distal end.

[0044] In another embodiment, by arranging different positions or different numbers of electromagnetically conductive active areas on multiple needles, energy can be provided to the entire skin layer to be treated through the needles. For example, if a first needle and a second needle are arranged adjacent to each other and connected with different polarities, and the first needle has one active area in the middle of the needle rather than at the end, and the second needle has active areas at positions below the active area of the first needle, the active areas of the first needle and the multiple active areas of the second needle are electrically connected to each other (e.g., form an electric field), so that electrical energy can be provided over a wide area.

[0045] In one embodiment, the casing 120 can accommodate the drive unit 140 therein, and the left and right casings can be connected to each other via a bolt 113, an insert member 114, a first connecting member 111, and a second connecting member 112, and can be connected to the connector 160 via a connecting member 180. The third connecting member 115 and the fourth connecting member 116 can be connected to the connecting member 180 in communication with each other.

[0046] In one embodiment, although not shown, a control unit controls the operation of the driving unit 140 or the multiple needles 110. That is, when the needles are inserted into the skin surface, the control unit applies a current to damage the skin tissue around the depth where the active area is located. In addition, the control unit controls the needles to protrude out of the cartridge 170 and be inserted into the skin surface after the device is placed on the skin surface without the needles protruding, and then controls the needles to be ejected after applying energy to the active area at a desired depth below the skin surface.

[0047] In another embodiment, when the pressure inside the cartridge (e.g., the space between the needle fixing portion and the skin surface) is directly adjusted, the control unit controls the cartridge 170 so that the inside of the cartridge 170 is in a negative pressure state by adjusting the air pressure inside the cartridge 170 when the surface of the cartridge 170 is brought into close contact with the target area, or controls the needle 110 to be activated when the inside of the cartridge 170 (i.e., the space between the needle fixing portion and the skin surface) is in a negative pressure state so that the needle 110 is inserted to a uniform depth into the skin surface.

[0048] In one embodiment, the electrical provider 150 generates energy that is transmitted to multiple needles 110 .

[0049] At this time, the current provided by the electricity provider 150 is used to raise the temperature of the active region (i.e., the target region) electromagnetically energized below the skin surface through the needle to a level that results in tissue heating. Also, the electricity provider 150 provides an AC current to the active region (or active zone) of the needle 110.

[0050] In one embodiment, the driver 140 directly or indirectly transmits force to the cartridge 170 so that multiple needles 110 fixed to the cartridge 170 are inserted into the skin.

[0051] For example, in the direct case, the driving unit 140 is directly and fixedly attached to the cartridge 170, and the multiple needles 110 are inserted into the skin by up and down movement. On the other hand, in the indirect case, the driving unit 140 strikes the cartridge 170, thereby applying force to move the cartridge 170 downward.

[0052] In this case, the driving unit 140 is preferably driven by any one of electromagnetic force, hydraulic force, pneumatic force, and a solenoid valve that is operated by an electric signal.

[0053] Fig. 4 is a diagram showing a needle according to an embodiment of the present invention. Fig. 5 is a diagram showing the arrangement of needles according to polarity according to an embodiment of the present invention. Fig. 6 is a diagram showing electrical energy transmitted to the skin by a needle according to an embodiment of the present invention. Fig. 7 is a diagram showing needles suitable for different skin depths according to an embodiment of the present invention. Fig. 8 is a diagram explaining the electrical energy transmission effect of a needle according to an embodiment of the present invention.

[0054] 4 to 8, the needle 110 includes distal ends 111a and 111b coated with an insulator, active regions 112a and 112b that are not coated with an insulator and are electromagnetically conductive, and insulating regions 113a and 113b that are coated with an insulator. For convenience of explanation, the first needle 110a and the second needle 110b shown in FIG. 4 will be used as an example.

[0055] In one embodiment, the distal ends 111a, 111b can be coated with an insulator, and the insulating distal ends 111a, 111b of the needle 110 can prevent bell-shaped tissue damage. That is, the insulating coating can cancel out the electromagnetic field caused by electrical energy applied to the needle 110.

[0056] In one embodiment, active regions 112a, 112b that are electromagnetically conductive may be formed on the needle 110 by making a portion of the needle 110 non-insulated except for the distal end thereof. That is, each needle 110 may include at least one active region 112a, 112b.

[0057] 5, multiple needles 110 having the same electromagnetically energized active areas 112a, 112b may be arranged two-dimensionally in a cartridge 170. That is, multiple first needles 110a may be arranged, or multiple second needles 110b may be arranged.

[0058] In one embodiment, the driver 140 or controller can provide electrical current after the needle 110 has been inserted to reach a target depth within the skin.

[0059] In one embodiment, the needle 110 can be electromagnetically energized and include multiple spaced apart active areas 112 a, 112 b, in which case electrical energy can be delivered to multiple skin locations corresponding to the respective skin depths at which the active areas 112 a, 112 b are located. That is, by forming multiple active areas 112 a, 112 b on the needle 110, electrical energy can be delivered to multiple skin locations.

[0060] In one embodiment, the needles 110 may be connected to electrodes of different polarities alternately in rows and columns. For example, as shown in FIG. 5, electrodes of (+) polarity and electrodes of (-) polarity may be connected to the needles 110 alternately in rows, and electrodes of (+) polarity and electrodes of (-) polarity may be connected to the needles 110 alternately in columns. In this case, electrodes of different polarities may be arranged above, below, left, and right of one electrode. That is, by arranging the needles 110 in a bipolar manner in which different polarities are alternately arranged, an electric field is formed with four (-) polarities surrounding a specific (+) polarity, corresponding to the top, bottom, left, and right of the specific (+) polarity, and electrical energy can be applied only to a skin region corresponding to a specific depth in the skin.

[0061] In another embodiment, at least two of the adjacent electrodes of the plurality of needles 110 may have the same polarity. For example, unlike in FIG. 5, electrodes of the same polarity may be arranged on at least one of the top, bottom, left, and right sides of one electrode.

[0062] In one embodiment, when the needle 110 includes multiple electromagnetically energized active areas 112a, 112b, the electrical energy can be delivered to the skin site to include the range between each active area 112a, 112b by adjusting the current intensity.

[0063] In one embodiment, the depth into the skin at which the active areas 112a, 112b can be positioned can be adjusted by adjusting the depth to which the needle 110 is inserted into the skin using the cartridge 170 of the skin treatment device in FIG. 2, the control unit, or the drive unit 140 in FIG. 3.

[0064] In one embodiment, needles 110 with differently positioned active areas 112a, 112b can be switched for skin treatment purposes corresponding to specific skin depths.

[0065] The above-described features of the needle 110 will be further described below with specific examples. The needle 110 has electromagnetically energized active areas 112a, 112b, which correspond to non-insulated areas, and can transmit electrical energy to skin areas located at specific depths in the skin. Furthermore, the active areas 112a, 112b can be separated into two or more areas as needed, thereby allowing energy to be applied to multiple skin areas located at desired specific skin depths.

[0066] Meanwhile, the energy transfer region (electromagnetic field formation region) of the electromagnetically energized active regions 112a and 112b may be determined depending on the intensity of the transferred electrical energy. For example, when the intensity of the transferred electrical energy is strong, an electromagnetic field may be formed to cover the gap between the active regions 112a and 112b. That is, as shown in FIG. 6, the active region 112a formed below the first needle 110a and the active region 112a formed above the first needle 110a may transfer electrical energy to the upper region A and the lower region A, respectively, and when the intensity of the electrical energy is strong, some region B may overlap. Therefore, when the intensity of the electrical energy is weak, unlike in FIG. 6, the overlap region B may not occur, and the electromagnetic field may be formed only in the regions of the first needle 110a adjacent to the active regions 112a and 112b.

[0067] In one embodiment, the length of the coating on the distal ends 111a, 111b, the length and number of the electromagnetically energized active areas 112a, 112b, and the length and number of the insulating areas 113a, 113b of the needle 110 can be determined taking into account the depth of the skin to be treated and the corresponding disease.

[0068] In one embodiment, the distal ends 111a, 111b, the electromagnetically conductive active regions 112a, 112b, and the insulating regions 113a, 113b may be arranged sequentially. For example, the electromagnetically conductive active regions 112a, 112b and the insulating regions 113a, 113b may each be formed in a plurality of numbers on the needle 110, and the active regions 112a, 112b and the insulating regions 113a, 113b may be arranged alternately.

[0069] In one embodiment, the length of the end portions 111a and 111b coated with the insulator may be 0.2mm to 0.3mm. If the insulator is coated within the range of 0.2mm to 0.3mm, it is possible to prevent electrical energy from concentrating on the end portions 111a and 111b.

[0070] In one embodiment, the length and number of the electromagnetically energized active areas 112a, 112b can be selected to be appropriate in consideration of the depth of the skin that needs to be treated.

[0071] 5, needles 110 to which different polarities are supplied are arranged alternately in a matrix, so that electrical energy can be delivered intensively only to the depth of the skin located between the needles 110. Specifically, the needles 110 installed in the needle holder 170 may include needles to which positive polarity electrical energy is supplied and needles to which negative polarity electrical energy is supplied. That is, the needles to which positive polarity electrical energy is supplied and the needles to which negative polarity electrical energy are supplied can be arranged alternately. For example, in a bipolar manner, an electromagnetic field can be formed between adjacent needles to which positive polarity electrical energy is supplied and needles to which negative polarity electrical energy is supplied. As a result, electrical energy can be delivered to a desired depth range of the skin, inducing tissue regeneration such as collagen. Furthermore, electrical energy can be delivered intensively only to skin regions corresponding to the depth of the skin adjacent to the active regions 112a and 112b, so that tissue in unnecessary areas is not damaged.

[0072] In one embodiment, as shown in FIG. 4, the first needle 110a may include two active regions 112a, the length t1 of the insulator-coated end portion 111a being 0.28 mm to 0.32 mm, the length t2 of the active regions 112a being 0.23 mm to 0.27 mm, and the length t1 of the insulating region 113a located between the active regions 112a being 0.28 mm to 0.32 mm. The insulating region 113a located at the top of the drawing and occupying the remainder of the first needle 110a is not limited to a particular length.

[0073] In one embodiment, as shown in FIG. 4, the second needle 110b may include one active region 112b, the length t3 of the insulator-coated end portion 111b being 0.18 mm to 0.22 mm, the length t4 of the active region 112b being 0.48 mm to 0.52 mm, and the insulating region 113b located at the top of the drawing and occupying the remainder of the second needle 110b is not limited to a specific length.

[0074] The reason why the first needle 110a and the second needle 110b have the above-mentioned ranges of values will be explained with reference to Figures 6 and 7. As shown in the photograph on the left side of Figure 6, it was confirmed that when the needle 110 is actually inserted into the skin, energy diffusion occurs over a length of about 0.23 mm to 0.25 mm above and below the length of the active regions 112a, 112b. That is, the length t5 of region A where energy spreads above and below the active region 112a of the first needle 110a may be 0.23 mm to 0.25 mm, and the length t7 of region C where energy spreads above and below the active region 112b of the second needle 110b may be 0.23 mm to 0.25 mm. That is, when the lengths of the distal ends 111a and 111b, the active regions 112a and 112b, and the insulating regions 113a and 113b are determined as shown in Fig. 5, taking into consideration the extension lengths of the energy regions A, B, and C, the length t6 of the energy transmission region of the first needle 110a may be 1.25 mm to 1.32 mm, and the length t8 of the energy transmission region of the second needle 110b may be 0.98 mm to 1.02 mm. In fact, as shown in Fig. 7, the skin depth C1 between the epidermis and the stratum corneum to which electrical energy should be transmitted for treating dark spots may be 0 to 0.5 mm, the skin depth C2 between the epidermis and the dermis to which electrical energy should be transmitted for skin tone, skin texture, and skin titining may be 0 to 1 mm, and the skin depth C3 between the epidermis and the dermis to which electrical energy should be transmitted for treating pores and rosacea may be 0 to 1.25 mm. That is, the depth of the skin to which electrical energy should be delivered can vary depending on the target of skin treatment (e.g., age spots), and the first needle 110a and second needle 110b of the present invention can be configured to deliver electrical energy according to each target. That is, the first needle 110a can deliver electrical energy to improve age spots, skin tone, skin texture, titaning, pores, and rosacea, and the second needle 110b can deliver electrical energy to improve age spots, skin tone, skin texture, and titaning.

[0075] That is, the needle 110 of the present invention can appropriately select the number and length of the active regions 112a, 112b so that electrical energy is delivered only to a specific depth of the skin. In addition to the number and length of the active regions 112a, 112b, the control unit can adjust the intensity of the electrical energy applied to the needle 110 to adjust the size of the electrical energy region delivered to the depth of the skin. That is, by adjusting the intensity of the electrical energy, the overlap region B can be present or absent.

[0076] Meanwhile, as described above, the needle 110 of the present invention alternately supplies electrical energy of opposite polarities to each needle, as shown in Fig. 5, so that electrical energy can be evenly transmitted to the skin between each needle, and electrical energy does not concentrate at the distal end by coating the distal end with an insulator. Therefore, as shown in Fig. 8, in the conventional needle 10, as can be seen in the photograph on the left, energy is concentrated at the distal end, and the electrical energy is not evenly transmitted in the direction of needle insertion into the skin, whereas in the needle 110b of the present invention, electrical energy does not concentrate at the distal end, and electrical energy is evenly transmitted in the direction of needle insertion into the skin, as can be seen in the photograph on the right of Fig. 8.

[0077] Fig. 9 is a perspective view of a handpiece according to an embodiment of the present invention, Fig. 10 is a cross-sectional view of a current applying needle tip according to an embodiment of the present invention, and Fig. 11 is a cross-sectional view showing a pumping effect generated when the current applying needle tip according to an embodiment of the present invention is operated.

[0078] 9-11, a skin treatment device of the present invention may include a handpiece 500.

[0079] The handpiece 500 is a part that is held by the physician, and the physician can move the handpiece 500 while it is in contact with the subject's skin to change the target location (for example, a part of the face). The handpiece 500 can be connected to a skin treatment device via a cable.

[0080] The handpiece 500 may have a built-in drive module 700 and a power supply module. Therefore, a cable can electrically connect each of the drive module 700 and the power supply module built into the handpiece 500 to an electronic control module built into the skin treatment device. A current application tip 600 can be attached to the end of the handpiece 500. In this case, the current application needle tip 600 can be switchably attached to the end of the handpiece 500 in the form of a cartridge.

[0081] A first conductive member 501 for electrically connecting the needle unit 620 of the current-applying needle tip 600 to the power supply module and a second conductive member 502 for docking with the cable connector 503 to electrically connect the power supply module to the cable may be disposed on the outside of the handpiece 500. In this case, the first conductive member 501 and the second conductive member 502 may be fabricated in the form of a film. For example, the first conductive member 501 and the second conductive member 502 may be a flexible printed circuit board (FPCB). As will be described later, the needle unit 620 of the current-applying needle tip 600 moves back and forth (drives). Therefore, the conductive lines between the needle unit 620 of the current-applying needle tip 600 and the power supply module, and the conductive lines between the power supply module and the cable are disposed on the outside of the handpiece 500 to prevent contact between the conductive lines during the reciprocating movement of the needle unit 620 of the current-applying needle tip 600.

[0082] The current-applying needle tip 600 may be a member that applies high frequency waves deep into the skin at a target location. The current-applying needle tip 600 may be detachably attached to the end of the handpiece 500. That is, the current-applying needle tip 600 of the present invention is manufactured in the form of a cartridge and is switchable.

[0083] The current application needle tip 600 may include a cylinder 610 and a needle unit 620. The cylinder 610 is a "stator" and may be a member detachably attached to the end of the handpiece 500. The needle unit 620 is a "moving element (moving vertically)" that includes one or more needles 621 and can invade deep into the skin at a target location at a constant period (the driving period of the driving module), and may be a member that applies radio frequency (RF) to the dermis layer of the skin as needed.

[0084] The cylinder 610 may have a vertically extending hole. A needle unit 620 may be disposed in the internal space of the cylinder 610. The bottom of the cylinder 610 may be open, and the bottom end of the cylinder 610 may be placed on the skin surface at the target location. Therefore, the open portion of the cylinder 610 may be closed by the skin surface at the target location.

[0085] The cylinder 610 may include a first cylinder 611 and a second cylinder 612. In this case, the first cylinder 611 may be located on the upper side, and the second cylinder 612 may be located on the lower side. The lower end of the first cylinder 611 may be connected to the upper end of the second cylinder 612. The lower surface of the second cylinder 612 may be open.

[0086] A needle unit 620 may be disposed inside the first cylinder 611 and the second cylinder 612, and the connecting portion between the first cylinder 611 and the second cylinder 612 may be closed by the needle unit 620.

[0087] A connecting rod 625 of the needle unit 620 can pass through the top surface of the first cylinder 611. A first space 1 and a surplus space 1-1 can be formed in the first cylinder 611 by the first plunger 623-1 of the needle unit 620. That is, the internal space of the first cylinder 611 can be closed vertically by the first plunger 623-1 of the needle unit 620, and can be divided into the first space 1 located on the upper side and the surplus space 1-1 located on the lower side.

[0088] In order to maintain the airtightness of the first space 1 of the first cylinder 611, a gasket 626 may be disposed between the upper surface of the first cylinder 611 and the connecting rod 625 of the needle unit 620. In addition, a gasket 626 may be disposed between the inner peripheral surface of the first cylinder 611 and the outer peripheral surface of the first plunger 623-1 of the needle unit 620.

[0089] The lower end of the second cylinder 612 can be placed on the surface of the skin at the target location. Therefore, the open portion of the lower surface of the second cylinder 612 can be closed by the surface of the skin at the target location. A second space 2 with an open lower surface can be formed in the second cylinder 612 by the second plunger 623-2 of the needle unit 620. The internal space of the second cylinder 612 can be closed vertically by the second plunger 623-2 of the needle unit 620, and the holder 622 of the needle unit 620 and the second plunger 623-2 of the needle unit 620 can be disposed on the upper side, and the second space 2 with an open lower surface can be located on the lower side.

[0090] One or more grooves 612-1 may be formed in the lower surface of the second cylinder 612 (see FIG. 3). The one or more grooves 612-1 of the second cylinder 612 may be formed from the outer peripheral surface of the second cylinder 612 to the inner peripheral surface of the second cylinder 612. That is, the one or more grooves 612-1 of the second cylinder 612 may be formed penetrating the second cylinder 612. Furthermore, the one or more grooves 612-1 of the second cylinder 612 may be arranged spaced apart from each other along the periphery of the lower surface of the second cylinder 612. That is, the one or more grooves 612-1 of the second cylinder 612 may be formed spaced apart from each other in the circumferential direction.

[0091] Meanwhile, as described above, the open portion of the lower surface of the second space 2 can be closed by the surface of the skin at the target location. In this case, a gasket 626 can be disposed between the inner circumferential surface of the second cylinder 612 and the outer circumferential surface of the second plunger 623-2 of the needle unit 620 to maintain airtightness of the second space 2. Meanwhile, while maintaining airtightness of the second space 2, only the lower end portion thereof is selectively connected to the outside through one or more grooves 612-1 of the second cylinder 612, thereby improving the pumping effect described below.

[0092] One or more needles 621 of the needle unit 620 may be disposed in the second space 2. As described above, the lower surface of the second space 2 is open, so that the one or more needles 621 can pass through the open portion of the second space 2 and enter the surface of the skin at the target location.

[0093] The cross-sectional area perpendicular to the vertical direction of the first cylinder 611 can be larger than the cross-sectional area perpendicular to the vertical direction of the second cylinder 612. Therefore, the amount of change in the volume of the first space 1 of the first cylinder 611 due to the reciprocating movement of the plunger 623 of the needle unit 620 in the vertical direction can be larger than the amount of change in the volume of the second space 2 of the second cylinder 612.

[0094] The cylinder 610 may additionally include a seat (see FIG. 11 ). The seat may be located in the second space 2. The seat may be arranged so as to slope downward inward from the inner circumferential surface of the second cylinder 612. The seat may be ring-shaped and arranged along the inner circumferential surface of the second cylinder 612. In this case, the seat of the present invention may be arranged along the periphery of one or more needles 621 of the needle unit 620, similar to the shape of a “valve seat.” In other words, the seat may cover the periphery of one or more needles 621 of the needle unit 620.

[0095] The outer edge of the seat may be a fixed edge, and the inner edge of the seat may be a free edge. Therefore, the angle of the downward tilt of the seat may be changed depending on the airflow around the seat. To improve the change of the tilt angle, the seat may be made of an elastic material.

[0096] The outer edge of the sheet may be positioned above one or more grooves 612-1 of the second cylinder 612. As a result, the inclination angle of the sheet may be varied by the flow of air through the one or more grooves 612-1 of the second cylinder 612. The sheet may interact with the one or more grooves 612-1 of the second cylinder 612 to improve the pumping effect described below.

[0097] The needle unit 620 can be disposed inside the cylinder 610. The needle unit 620 can be reciprocated in the vertical direction by the driving module 700. That is, the needle unit 620 can be disposed inside the first cylinder 611 and the second cylinder 612, and can reciprocate like a piston. Furthermore, a plunger 623 can be provided to partition the internal spaces of the first cylinder 611 and the second cylinder 612, and the volume of the internal spaces of the first cylinder 611 and the second cylinder 612 can be changed.

[0098] The needle unit 620 can repeatedly (periodically) invade the skin at the target location by vertically reciprocating movement. Furthermore, the needle unit 620 generates high frequency waves from deep within the skin at the target location, and collagen and elastic fibers damaged by the thermal energy of the high frequency waves are regenerated over time, thereby increasing skin firmness.

[0099] The needle unit 620 may include one or more needles 621 , a holder 622 , a plunger 623 and a connecting rod 625 .

[0100] The one or more needles 621 can be reciprocated with the plunger 623 to alternately insert and eject the needles 621 into the skin. Radio frequency energy can be applied to the one or more needles 621 to generate thermal energy deep within the skin at the target location.

[0101] However, the present invention is not limited to this, and electric energy and ultrasonic waves of various wavelength bands other than high frequency waves may be applied to one or more needles 621. Furthermore, as described above, it is also possible that electric energy and ultrasonic waves are not applied to one or more needles 621.

[0102] When electrical energy such as high frequency is applied to the one or more needles 621, the needles 621 may be electrically connected to the power supply module to receive power. To this end, the one or more needles 621 may be electrically connected to the power supply module via the first conductive member 501 described above.

[0103] Meanwhile, the one or more needles 621 may be a bipolar type electrode unit in which multiple electrodes have two polarities and high frequency is generated between adjacent electrodes, or may be a monopolar type electrode unit in which multiple electrodes all have the same polarity. Meanwhile, if the one or more needles 621 are of the monopolar type, a ground electrode module (not shown) for returning the high frequency generated from the one or more needles 621 may be additionally provided.

[0104] The one or more needles 621 may be supported by a holder 622. The one or more needles 621 may extend downward from the holder 622. The one or more needles 621 may be disposed in the second space 2 of the second cylinder 612.

[0105] The one or more needles 621 can move back and forth in the vertical direction by the driving force of the driving module 700. When the needle unit 620 is at the bottom dead center, the lower end of the one or more needles 621 can be positioned deep in the skin at the target point, and when the needle unit 620 is at the top dead center, the lower end of the one or more needles 621 can be positioned above the skin surface at the target point.

[0106] Therefore, the one or more needles 621 can repeatedly penetrate deep into the skin at the target location. In this case, the one or more needles 621 can pass through an opening formed on the lower surface of the second space 2 of the second cylinder 612, protrude downward, and then return (return) upward. Meanwhile, the penetration depth of the one or more needles 621 can be approximately 2.1 mm.

[0107] The holder 622 can be a member that supports one or more needles 621. The holder 622 can be arranged in the second space 2 of the second cylinder 612, as can the one or more needles 621. The holder 622 can also be arranged on the underside of the second plunger 623-2 and coupled to the second plunger 623-2. Furthermore, the holder 622 can be omitted in some cases, in which case the one or more needles 621 can be arranged directly on the plunger 623.

[0108] The plunger 623 reciprocates upward and downward, forming a first space 1 and a second space 2 inside the cylinder 610. In addition, the plunger 623 may be formed with a first channel 3 connecting the first space 1 and the second space 2.

[0109] Since the change in volume of the first space 1 due to the reciprocating movement of the plunger 623 is greater than the change in volume of the second space 2, when the plunger 623 moves downward, the gas in the second space 2 can move to the first space 1 through the first channel 3, and when the plunger 623 moves upward, the gas in the first space 1 can move to the second space 2 through the first channel 3.

[0110] Therefore, when the plunger 623 moves downward, one or more needles 621 penetrate the skin, creating a negative pressure state (pressure reduction) in the second space 2, and when the plunger 623 moves upward, one or more needles 621 are expelled from the skin, creating a positive pressure state (pressure increase) in the second space 2.

[0111] The plunger 623 may include a first plunger 623-1 and a second plunger 623-2. The first plunger 623-1 may be disposed in the internal space of the first cylinder 611. The first plunger 623-1 may close the internal space of the first cylinder 611 in the vertical direction, thereby forming a first space 1-1 located above the first cylinder 611 and a surplus space 1-1 located below the first cylinder 611.

[0112] The first plunger 623-1 can move back and forth in the vertical direction by the driving force of the driving module 700. When the first plunger 623-1 moves downward, the volume of the first space 1-1 can increase and the volume of the surplus space 1-1 can decrease (see (1) in FIG. 11). When the first plunger 623-1 moves upward, the volume of the first space 1-1 can decrease and the volume of the surplus space 3-1 can increase (see (2) in FIG. 11).

[0113] The second plunger 623-2 may be located in the internal space of the second cylinder 612. The second plunger 623-2 may close the internal space of the second cylinder 612 in the vertical direction to form a second space 2 in the second cylinder 612.

[0114] The second plunger 623-2 can reciprocate vertically by the driving force of the driving module 700. When the second plunger 623-2 moves downward, the volume of the second space 2 can decrease (see (1) in FIG. 11). When the second plunger 623-2 moves upward, the volume of the second space 2 can increase (see (2) in FIG. 11).

[0115] A first channel 3 connecting the first space 1 and the second space 2 may be formed in the first plunger 623-1 and the second plunger 623-2. In this case, the first channel 3 formed in the first plunger 623-1 and the second plunger 623-2 may be one or more flow paths 3-1 that vertically penetrate the first plunger 623-1 and the second plunger 623-2 (formed in the first plunger and the second plunger).

[0116] The connecting rod 625 may be disposed above the first plunger 623-1. The connecting rod 625 may be moved vertically by the driving force of the driving module 700. The connecting rod 625 is connected to the driving module 700 and the first plunger 623-1, and functions to transmit the driving force of the driving module 700 to the first plunger 623-1.

[0117] The operation (pumping effect) of the current application needle tip 600 will be described below with reference to Figure 11. When the skin treatment device of the present invention is operated, the needle unit 620 reciprocates vertically (up and down) to repeatedly invade the skin at the target location (when high frequency is applied, thermal energy is generated deep in the skin). Meanwhile, a drug to relieve pain caused by the intrusion or to promote wound regeneration can be applied to the surface of the skin at the target location.

[0118] When the needle unit 620 moves downward, the volume of the first space 1 may increase and the volume of the second space 2 may decrease. In this case, due to the difference in the cross-sectional areas of the first space 1 and the second space 2 in the vertical direction, the change in the volume of the first space 1 may be greater than the change in the volume of the second space 2. That is, the increase in the volume of the first space 1 may be greater than the decrease in the volume of the second space 2. Meanwhile, because the first space 1 and the second space 2 are connected by the first channel 3, gas in the second space 2 can move to the first space 1 through the first channel 3 (see (1) in FIG. 11; movement due to the pressure difference resulting from the difference in the change in volume). Therefore, the second space 2 is in a "negative pressure state (decreased pressure; conversely, the first space is in a positive pressure state due to increased pressure)," which sucks in the surface of the skin at the target point and equalizes the height of the skin at the surface of the target point. As a result, one or more needles 621 can penetrate to a uniform depth (the effect of penetrating to a uniform depth is that each of the multiple needles emits high frequency at an penetration depth (previously set depth) that meets the medical design requirements).

[0119] As the needle unit 620 moves upward, the volume of the first space 1 may decrease and the volume of the second space 2 may increase. In this case, due to the difference in the cross-sectional areas of the first space 1 and the second space 2 in the vertical direction, the change in the volume of the first space 1 may be greater than the change in the volume of the second space 2. That is, the decrease in the volume of the first space 1 may be greater than the increase in the volume of the second space 2 of the second cylinder 612. Meanwhile, because the first space 1 and the second space 2 are connected by the first channel 3, gas in the first space 1 can move to the second space 2 through the first channel 3 (see (2) in FIG. 11 , movement due to the pressure difference resulting from the difference in the change in volume). As a result, the second space 2 is in a "positive pressure state (increased pressure; conversely, the first space is in a negative pressure state due to a decreased pressure)," allowing the drug applied to the surface of the skin at the target location to be deeply injected into the invasive site (the hole formed by the insertion and ejection of the needle electrode) (the effect of deeply injecting the drug into the depths of the skin).

[0120] Meanwhile, a second channel 4 connecting the surplus space 1-1 to the outside may be formed in the first cylinder 611. The second channel 4 prevents the gas pressure in the surplus space 1-1 from interfering with the vertical reciprocating movement of the first plunger 623-1. That is, when the needle unit 620 moves downward, the air in the surplus space 1-1 can be discharged to the outside, thereby eliminating resistance.

[0121] In one embodiment, the needle 110 of the present invention can be manufactured as follows: First, silicon is provided to a thickness to form the active regions 112a, 112b corresponding to the non-insulated portions, the needle 110 is coupled to the cartridge 170, the needle 110 is inserted into the silicon up to the position where the active regions 112a, 112b of the needle 110 are to be formed, and an insulating material is sprayed with the needle 110 inserted into the silicon to form the distal ends 111a, 111b and the insulating regions 113a, 113b. Alternatively, the needle 110 can be manufactured so that some regions are not insulated and then finally assembled, or the needle 110 can be manufactured and then inserted into a silicon layer for insulation.

[0122] Specifically, when fabricating needle tips including the same number of active areas at the same specific positions, needles without insulation are first fixed to the cartridge 170 and then inserted into silicon with a thickness corresponding to the range of the active areas. At this time, a silicon pad with a specific thickness can be pulled from both sides to prevent loosening during needle insertion, so that multiple needles can be positioned at a consistent depth simultaneously. When multiple active areas are to be formed at the same positions on each needle, multiple needles are inserted while maintaining a silicon pad with a thickness corresponding to the range of each active area, the distance between the active areas being maintained. Then, with the silicon positioned at the positions where the active areas are to be formed, the multiple needles are insulated. This allows multiple needles to form active areas at the same positions.

[0123] Here, the silicon can be replaced with various materials that can be penetrated by needles and positioned at desired locations and can be formed to a thickness within the range desired to form the active region. That is, the silicon can be replaced with any material that can be penetrated by one or more needles and prevents the insulating material from being sprayed onto the surface of the active region. For example, any soft material such as silicon or rubber can be used.

[0124] A needle tip for applying electric current according to one embodiment of the present invention includes a needle fixing portion and a plurality of needles arranged two-dimensionally on the needle fixing portion, each of which includes at least one active area formed by not coating an insulator in a portion of the area except for the terminal end, and the plurality of needles are connected to electrodes of alternately different polarities, and four needles surrounding a needle connected to an electrode of (+) polarity are connected to an electrode of (-) polarity. When the plurality of needles includes a plurality of spaced-apart active areas, electrical energy can be transmitted between the spaced-apart active areas by adjusting the intensity of the current applied to each electrode connected to the plurality of needles.

[0125] A skin treatment device according to one embodiment of the present invention may include a casing for sucking in a target area on the skin surface, a plurality of needles disposed inside the casing, a needle fixing portion into which the plurality of needles are inserted and fixed, a control portion for controlling the operation of the casing and the plurality of needles, an electrical energy transmission portion electrically connected to the plurality of needles for transmitting electrical energy, and an electrical energy generation portion for generating electrical energy to be transmitted to the plurality of needles via the electrical energy transmission portion.

[0126] A handpiece according to an embodiment of the present invention can be equipped with a current-applying needle tip according to an embodiment of the present invention.

[0127] A method for manufacturing a needle tip for applying current according to one embodiment of the present invention may include the steps of providing silicon of a thickness to be formed as an active region corresponding to a non-insulated portion, attaching a plurality of needles to a needle fixing portion, inserting the plurality of needles into the silicon up to the position of the plurality of needles where the active region is to be formed, and injecting an insulating material while the plurality of needles are inserted into the silicon to form an end portion and an insulating region.

[0128] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art will understand that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the above-described embodiments should be understood as illustrative in all respects and not restrictive.

Claims

1. A cylinder; a plunger provided in the cylinder so as to be reciprocable; a plurality of needles coupled to the plunger so as to be inserted into and ejected from the skin by reciprocating movement of the plunger; Each of the needles is a first insulating region formed by coating an insulating material on the end portion; an active region formed in at least one region on the needle excluding the first insulating region, the active region being electromagnetically energized; Including, the plurality of needles includes a plurality of first needles and a plurality of second needles arranged alternately one by one along both columns and rows; the electric energy supplied to the first needle and the electric energy supplied to the second needle have opposite polarities; The plunger separates the interior of the cylinder into a first space and a second space, The first space is formed between one side of the cylinder and one side of the plunger, the second space is formed between the other side of the cylinder, the skin, and the other side of the plunger; a first channel is formed through the plunger to connect the first space and the second space; a change in volume of the first space due to the reciprocating movement of the plunger is larger than a change in volume of the second space, and therefore, when the plunger moves in a first direction, the gas in the second space moves to the first space through the first channel, and when the plunger moves in a second direction, the gas in the first space moves to the second space through the first channel, the first direction is a direction in which the plunger approaches the skin, and the second direction is a direction in which the plunger moves away from the skin; When the plunger moves in the first direction relative to the skin, the skin is sucked into the second space, creating a negative pressure in the second space so that the needle is inserted into the skin; A needle tip for applying electric current, in which the needle is expelled from the skin and a positive pressure state is created in the second space by moving the plunger in the second direction opposite to the first direction.

2. 2. The current application needle tip of claim 1, wherein when the needle is inserted into the skin, electrical energy is transmitted only to a specific depth of the skin adjacent to the active area.

3. The active region is configured as a plurality of regions in one region excluding the distal end portion of the needle, The current application needle tip according to claim 1, wherein when the needle is inserted into the skin, electrical energy is simultaneously transmitted to a plurality of the skin regions adjacent to the plurality of active areas.

4. 2. The needle tip for applying electric current according to claim 1, wherein the depth into the skin at which the active area is located is adjusted according to the length of the needle inserted into the skin.

5. 2. The needle tip for applying electric current according to claim 1, wherein the first insulating region prevents electrical energy from concentrating at the distal end of the needle.

6. The needle tip for applying electric current according to claim 1, wherein a hole is formed in the skin when the plunger moves in the second direction, and a drug previously applied to the skin is injected into the hole due to the positive pressure state in the second space.

7. The cylinder includes a first cylinder and a second cylinder, The plunger a first plunger that forms the first space and an excess space in the first cylinder; a second plunger that forms the second space in the second cylinder, 2. The current application needle tip according to claim 1, wherein a second channel is formed in the first cylinder to connect the excess space with the outside.

8. The needle 2. The needle tip for applying electric current according to claim 1, further comprising a second insulating region formed by coating the insulator on at least one region excluding the distal end.

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