Needle unit for drug injection and skin treatment device comprising same

Abstract

The present invention relates to a needle unit for drug injection according to one embodiment of the present invention and a skin treatment device comprising the same. The needle unit for drug injection according to the present invention comprises: a cylinder; a plunger provided so as to be capable of reciprocating inside the cylinder; a plurality of needles arranged to be connected to the plunger such that at least a partial region is selectively exposed to the outside of the cylinder; and a pressurizing member that is interposed between the plunger and the needles so as to separate the space between the needles exposed to the outside of the plunger, in which a drug is injected through an expansion hole formed in the skin while the tips of the needles are spaced apart from each other in a state in which the needles are inserted into the skin.

Description

Technical Field

[0001] This invention relates to a drug injection needle unit and a skin treatment device including the same. Background Technology

[0002] Recently, a drug injection tip has been developed for use in scar treatment, hair regrowth treatment, axillary odor treatment, vascular treatment, fat reduction, wrinkle removal, skin elasticity restoration, sebum removal, and acne treatment.

[0003] The drug injection tip can treat skin conditions by repeatedly inserting multiple needles into the skin to remove malignant tissue and promote the formation of new tissue. Furthermore, the tip can utilize the heat generated by an electric current applied by the handpiece to remove collagen, elastin fibers, and other substances from the skin and promote new tissue formation, thus improving skin pigmentation, acne scars, and wrinkles.

[0004] Furthermore, during the insertion and withdrawal of multiple needles into the skin, in order to alleviate pain and treat skin wounds, medication can be injected into the holes formed in the skin due to the insertion and withdrawal of the needles. In this case, to improve the efficacy of the medication, it is preferable to inject the medication into the skin over as wide an area as possible.

[0005] However, the problem with existing drug injection tips is that the diameter of the hole formed in the skin due to the insertion and withdrawal of multiple needles is limited by the diameter of the needles, resulting in a narrow range of drug injection through the hole formed in the skin. Summary of the Invention

[0006] Technical issues The present invention was proposed to solve the above-mentioned problems. The purpose of the present invention is to provide a drug injection needle unit and a skin treatment device including the needle unit, which expands the drug injection range of the skin by forming an expansion hole for drug injection after the needle is inserted into the skin.

[0007] The technical problems to be solved by this invention are not limited to those mentioned above. Those skilled in the art can clearly understand other technical problems not mentioned from the following description.

[0008] Technical solution A skin treatment device equipped with a drug injection needle according to an embodiment of the present invention may include: a cylinder; a plunger configured to reciprocate within the cylinder; at least two needles arranged to be connected to the plunger such that at least a portion of the needles are selectively exposed outside the cylinder; and a pressurizing member sandwiched between the plunger and the needles to separate the needles exposed outside the plunger, wherein, while the needles are inserted into the skin, the drug is injected through an expansion hole formed in the skin while the tips of the needles are spaced apart from each other.

[0009] In addition, the pressurizing component may include: a plate disposed at the lower part of the plunger; an interference portion protruding from the lower part of the plate and forming a receiving groove for receiving at least a portion of each of the needles; and a connecting portion protruding from the upper part of the plate for selective insertion into an extension protruding from the lower center of the plunger.

[0010] In addition, the cylinder may include at least one guide portion protruding on the inner peripheral surface in a manner corresponding to the moving direction and range of the pressurizing component, and the plate may include a guide groove formed on the outer peripheral surface in a manner for at least a portion of the guide portion to be inserted, and the plate may be guided to reciprocate within the cylinder by the guide portion.

[0011] In addition, the skin treatment device equipped with the drug injection needle may also include: an elastic member sandwiched between the plunger and the pressure member and providing elastic restoring force so that the pressure member is always in close contact along the plunger direction.

[0012] Furthermore, the skin treatment device equipped with the drug injection needle may also include: an actuator that generates kinetic energy from the reciprocating movement of the pressure member; and a rod connecting the actuator and the pressure member, wherein if the rod causes the pressure member to descend, an elastic member connected to the pressure member descends by pulling the plunger until the plunger contacts the upper end of the guide portion; after the plunger has descended, if the rod descends further, only the pressure member descends further, while the interference portion separates the front ends of the needle.

[0013] Furthermore, the needle may include: a first region; and a second region bent from the first region, wherein, with the first region housed in the receiving groove, the first region is formed at the same angle as the inner circumferential surface of the receiving groove, and the second region is formed at a different angle from the inner circumferential surface of the receiving groove.

[0014] Furthermore, the needle can be connected in a manner that allows it to be tilted from the plunger.

[0015] Furthermore, the cylinder may include: a first space disposed above the plunger; and a second space disposed below the plunger, the plunger may include: a channel connecting the first space and the second space.

[0016] In addition, the pressurizing component may include a plurality of drug discharge holes formed through the plate to allow drugs supplied through the channels to be discharged toward the skin in a second space.

[0017] In addition, the pressurizing component may include a plurality of needle insertion holes penetrating the plate, such that each of the needles is connected to the plunger.

[0018] In addition, it may include: a communication passage formed in communication between the pressurizing member and the rod, for the entry and exit of a fiber laser for supplying medication to the tip region of the needle or for irradiating the epidermal layer of the skin.

[0019] Invention Effects The advantage of a skin treatment device equipped with a drug injection needle according to an embodiment of the present invention is that, after the needle is inserted into the skin, the pressure member expands the gap between the needles, thereby forming an expanded expansion hole in the skin to allow for drug injection and to expand the drug injection range of the skin.

[0020] The effects of the present invention are not limited to those mentioned above, and those skilled in the art will clearly understand other effects not mentioned through the following description. Attached Figure Description

[0021] Figure 1 This is a perspective view of a skin treatment device according to an embodiment of the present invention, showing a drug injection needle unit disposed in a handheld component.

[0022] Figure 2 This is a cross-sectional view showing a drug injection needle unit according to an embodiment of the present invention.

[0023] Figure 3 This is a perspective view showing the pressurization component of a drug injection needle unit combined with a needle.

[0024] Figure 4 This is a perspective view showing the lower part of the pressure component of the drug injection needle unit.

[0025] Figure 5 It is a cross-sectional view and a plan view of the skin showing a state in which a portion of the needle is exposed to the outside of the cylinder while the plunger of the drug injection needle unit is lowered.

[0026] Figure 6It is a cross-sectional view and a plan view of the skin showing the state in which the drug is supplied to the skin through the connecting passage while the pressure component of the drug injection needle unit is lowered and the gaps between the needles are separated.

[0027] Figure 7 It is a cross-sectional view and a plan view of the skin showing that, while the pressure component of the drug injection needle unit is lowered and the gaps between the needles are separated, a fiber laser is introduced through a connecting passage to irradiate the epidermis of the skin with laser light. Detailed Implementation

[0028] The advantages, features, and methods for implementing the invention will be readily understood by referring to the embodiments described in detail below with reference to the accompanying drawings. However, the invention is not limited to the embodiments disclosed below, which can be implemented in various different forms. These embodiments are provided merely to complete the disclosure of the invention and to fully inform those skilled in the art of the scope of the invention, which is defined only by the scope of the claims.

[0029] Unless otherwise defined, all terms used in this specification (including technical and scientific terms) are to be understood in a meaning commonly understood by one of ordinary skill in the art to which this invention pertains. Furthermore, terms as defined in commonly used dictionaries should not be interpreted ideally or excessively unless specifically defined.

[0030] Terms such as "below," "below," "lower," "above," and "upper," which are spatially relative, can be used to conveniently describe the relationship between one component and another, as shown in the figure. Spatially relative terms should be understood to include not only the directions shown in the figure but also terms indicating the different orientations of the components during use or operation. For example, when flipping the components shown in the figure, a component described as "below" or "below" of another component can be placed "above" of that component. Therefore, the illustrative term "below" can include both the directions of below and above. Components can also be oriented in other directions, so spatially relative terms can be interpreted according to orientation.

[0031] Before describing the present invention, in several embodiments, the same reference numerals are used for constituent elements having the same configuration, and a representative description is given in one embodiment. In other embodiments, configurations different from those in one embodiment are described.

[0032] In the direction indication of this invention, the upper side of the figure is defined as the upper side, the lower side of the figure is defined as the lower side, and the vertical direction of the figure is defined as the vertical direction.

[0033] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0034] Figure 1 This is a perspective view showing a skin treatment device equipped with a drug injection needle unit according to an embodiment of the present invention. Figure 2 This is a cross-sectional view showing a drug injection needle unit according to an embodiment of the present invention.

[0035] According to an embodiment of the present invention, a drug injection needle unit 100 can be detachably attached to the lower end of a skin treatment device 30.

[0036] The handpiece 35 can be used as a handle for the practitioner to hold. Specifically, the practitioner holds the skin treatment device 30 to bring it into contact with the patient's skin. If a portion of the needle 110 is inserted into the skin, an expansion hole 11 is formed in the skin 10 by separating the front ends of each of the needles 110 (see figure). Figure 6 This allows medication applied to the skin 10 or supplied to the skin 10 from within the skin treatment device 30 to easily flow into the dilation port 11 of the recipient. Of course, the practitioner can change the target site for injecting the medication into the recipient's skin 10 by moving the handpiece 35.

[0037] Furthermore, the skin treatment device 30 may be provided with a drug supply unit (not shown) for supplying the drug 20 to the tip region of the needle 110 and a power supply unit (not shown) for selectively applying current to each of the needles 110. Such drug supply unit and power supply unit may be controlled by a control unit 40.

[0038] As an example, the control unit 40 is provided in the handheld part, which, when the needle 110 is inserted into the skin 10, can be controlled to make the drug supply part connect along the central axis of the pressure member 140 and the rod 150 (see below) to form a communication passage 150a. Figure 2 The control unit 40 can supply medication to the tip region of the needle 110, or apply current to the needle 110 via the power supply unit. Furthermore, the control unit 40 can control the fiber laser 50 (see reference 150a) to enter and exit through the communication path 150a. Figure 7 Laser is irradiated onto the epidermal layer of skin 10. Drug or fiber laser can be selectively introduced into the connecting pathway 150a. Furthermore, the connecting pathway 150a can be selectively configured. In addition, multiple connecting pathways can be configured.

[0039] Furthermore, when the needle 110 is removed from the skin 10, the control unit 40 can control the supply of medication to the needle 110 to be interrupted or the application of current to the needle 110 to be interrupted.

[0040] According to an embodiment of the present invention, a drug injection needle unit 100 includes a cylinder 120, a plunger 130, a needle 110, and a pressurizing component 140.

[0041] First, the cylinder 120 is detachably attached to the lower end of the handheld component 35. In another embodiment, although not shown, the drug injection needle unit 100 is not detachably attached to the handheld component 35, and the cylinder 120 can also be shaped like a handheld component to have the function of a handheld component.

[0042] The cylinder 120 has a receiving space, which allows the plunger 130 to reciprocate. The receiving space includes a first space 121 arranged above the plunger 130 and a second space 122 arranged below the plunger 130. Of course, the cross-sectional area or volume of the first space 121 and the second space 122 can be changed relative to each other due to the reciprocating movement of the plunger 130.

[0043] The cylinder 120 has a shape that closes the upper side of the first space 121 and a structure that opens the lower (or outer) front end of the second space 122. That is, an opening 123 is formed on the lower side of the second space 122. Of course, although not shown, the opening 123 can also be configured to allow only the needle 110 to enter and exit while the remaining area is partially closed. In this embodiment, the opening 123 can be formed at the lower end of the cylinder 120, and the periphery of the opening 123 can contact the skin 10.

[0044] A shielding portion 124, protruding inward in a flange shape from the inner peripheral surface of the cylinder 120, may be provided on the first space 121 of the cylinder 120. The shielding portion 124 has a through hole formed in its center to allow the rod 150 to move. An O-ring 151 for maintaining an airtight seal may be provided between the inner peripheral surface of the shielding portion 124 and the rod 150. Therefore, a separate third space 125 is provided above the first space 121 of the cylinder 120 with reference to the shielding portion 124.

[0045] An actuator 160 is provided in the third space 125, and a lever 150 provides the function of transferring the kinetic energy generated from the actuator 160 to the plunger 130. At this time, the upper region of the lever 150 can be arranged to span the middle of the first space 121 and the third space 125, and the lower region can be arranged to penetrate the center of the interior of the plunger 130.

[0046] Furthermore, the plunger 130 is arranged to reciprocate in the vertical direction as the rod 150 moves. Although not shown in the figures, a guide structure (not shown) for limiting the direction or distance of movement between the cylinder 120 and the rod 150 may be provided. The plunger 130 may be sized to correspond to the diameter of the cylinder 120, and an O-ring 131 for maintaining an airtight seal may be provided between the plunger 130 and the cylinder 120.

[0047] A channel 132 can be formed inside the plunger 130, extending through the plunger 130 in a vertical direction. The channel 132 can provide a passage connecting the first space 121 and the second space 122, and preferably, multiple channels are formed in a predetermined pattern.

[0048] Multiple needles 110 and pressure components 140 are arranged in the second space 122.

[0049] Figure 3 This is a perspective view showing the pressurization component of a drug injection needle unit combined with a needle. Figure 4 This is a perspective view showing the lower part of the pressure component of the drug injection needle unit.

[0050] Reference Figures 2 to 4 The needles 110 are engaged at the lower end of the plunger 130 in a manner adjacent to the edge region. At this time, each of the needles 110 can be engaged with the plunger 130 at an angle. This is to allow for a wider spacing of the needles 110, as described later, to maintain engagement with the plunger 130.

[0051] Each of the needles 110 can be coupled via a bracket 135 located at the lower end of the plunger 130.

[0052] Next, at least two needles 110 are provided. In this embodiment, an example is described where four needles 110 are arranged at equal intervals or at equal angles to each other.

[0053] The four needles 110 can be arranged at right angles to each other in the lower edge region of the plunger 130. Of course, the direction or angle of the needles 110 is not limited, as long as the front end of each of the needles 110 is spaced apart from each other.

[0054] The needle 110 includes a first region 111 disposed on the upper part and a second region 112 disposed below the first region 111. The needle 110 is configured such that the tilt angles of the first region 111 and the second region 112 are different from each other, and are configured with a tilt angle that gradually approaches the central axis 133 from the first region 111 towards the second region 112, based on the virtual central axis 133 of the plunger 130. That is, the first region 111 of the needle 110 is arranged with a larger tilt angle relative to the central axis 133, and the second region 112 is arranged with a smaller tilt angle relative to the central axis 133. Furthermore, the tip of the second region 112 is the sharpest region, such that the tips of each of the needles 110 are arranged closely together, pointing towards a single point. The separation of the tips of each of the needles 110 will be described later.

[0055] Furthermore, the pressurizing component 140 is sandwiched between the plunger 130 and the needle 110, and is arranged to maintain the same height relative to each of the needles 110.

[0056] The pressurizing component 140 includes a plate 141, an interference portion 142, and a connecting portion 143.

[0057] Plate 141 has a generally circular disk shape, and a plurality of guide grooves 144 can be formed on its outer peripheral surface. The guide grooves 144 are arranged to correspond to the guide portion 113 protruding from the inner peripheral surface of the second space 122 of the cylinder 120 along the moving direction of the plunger 130, and are guided along the guide portion 113 in a manner that allows the pressurizing member 140 to reciprocate. Therefore, the moving direction and moving range of the pressurizing member 140 can be set by the guide portion 113.

[0058] The upper end of the guide portion 113 can be arranged to interfere with the lower end of the plunger 130. Therefore, if the plunger 130 descends and contacts the guide portion 113, its movement can be stopped.

[0059] In addition, a plurality of drug discharge holes 145 are formed on the plate 141, and four needle insertion holes 146 may be formed for each of the needles 110 to pass through.

[0060] A connecting portion 143 protrudes from the upper part of the plate 141. The connecting portion 143 can be selectively inserted into the interior of the extension 134 that protrudes downward from the lower end of the central region of the plunger 130. Therefore, the connecting portion 143 can have a shape corresponding to the extension 134.

[0061] An elastic member 170 is provided between the connecting portion 143 and the extension portion 134. The elastic member 170 generates a spring force to bring the plunger 130 and the pressurizing member 140 close to each other. Therefore, in the absence of a force generated by the movement of the plunger 130 or the pressurizing member 140, the connecting portion 143 is arranged to be inserted into or closely fitted to the extension portion 134 by the spring force of the elastic member 170.

[0062] Therefore, the pressurizing member 140 is directly connected to the rod 150, so that it can move with the movement of the rod 150, and can be indirectly connected to the plunger 130 through the elastic member 170.

[0063] An interference portion 142 protrudes from the lower part of the plate 141. A receiving groove 147 is formed in the interference portion 142 to receive at least a portion of the first region 111 of each of the needles 110. The interference portion 142 may have a shape with a gradually decreasing cross-sectional area towards the lower part, with reference to the virtual central axis 133 of the plunger 130, and a cross-section is generally formed in a triangular or trapezoidal shape.

[0064] At this time, the needle insertion hole 146 and the receiving groove 147 can be arranged such that at least a portion of them overlap each other in the vertical cross section. Therefore, while the needle 110 penetrating the needle insertion hole 146 is inserted into the receiving groove 147 in a portion of the first region 111, the spacing of the front ends of each of the needles 110 can vary according to the rise and fall of the interference portion.

[0065] Figure 5 It is a cross-sectional view and a plan view of the skin showing the state in which a portion of the needle is exposed to the outside of the cylinder while the plunger of the drug injection needle unit is lowered. Figure 6 It is a cross-sectional view and a plan view of the skin showing the state in which the pressure component of the drug injection needle unit is lowered while the gaps between the needles are separated.

[0066] Reference Figure 5 and Figure 6 The drug injection needle unit 100 is operated starting from the movement of the rod 150.

[0067] With the cylinder 120 in close contact with the skin 10, if the rod 150 descends, the pressure member 140 will simultaneously pull the plunger 130 downwards to the upper end of the guide portion 113. At this time, if the plunger 130 contacts the upper end of the guide portion 113, the tip of the needle 110 will protrude outwards from the opening 123 and be inserted into the skin 10.

[0068] If the plunger 130 contacts the upper end of the guide portion 113, the plunger 130 stops descending, and only the pressurizing component 140 can descend further.

[0069] The plunger 130 is connected to the pressure member 140 via the elastic member 170.

[0070] Figure 5 The image shows the state in which the plunger 130 moves together with the pressurizing member 140 to contact the upper end of the guide portion 113.

[0071] and, Figure 6 This illustrates the state where, if the plunger 130 stops descending, only the pressure member 140 descends further. The pressure member 140 moves downwards as the lever 150 descends; at this point, because the plunger 130 has stopped descending, the needle 110 will not descend further within the skin 10.

[0072] Furthermore, if the pressure member 140 is further lowered while the rod 150 is further lowered, the interference portion 142 can rotate or elastically deform the tip of each of the needles 110 in a direction away from each other while pressurizing the first region 111 of the needles 110. Since the needles 110 are coupled to the lower end of the plunger 130 via the bracket 135, they can be tilted or elastically deformed (e.g., bent) relative to the plunger 130.

[0073] Thus, the front ends of the second region 112 of each of the needles 110 can be arranged to be spaced apart from each other. The situation where the front ends of each of the needles 110 are spaced apart corresponds to the situation where an expansion hole 11 is formed when the needles 110 are inserted into the skin 10. That is, after the needles 110 are inserted into the skin 10, they will be spaced apart from each other, and an expansion hole 11 will be formed when the needles 110 that were originally converging at one point are spaced apart from each other.

[0074] The operation of a drug injection needle unit 100 according to an embodiment of the present invention will be described in more detail, such as Figure 5 As shown, with the cylinder 120 tightly fitted against the skin 10, the plunger 130 is moved downwards. At this time, the needle 110 protrudes from the second space 122 of the cylinder 120 into the skin 10, and the second region 112 of the needle 110 is inserted into the skin 10, forming an entry hole in the skin 10.

[0075] Next, as Figure 6 As shown, the plunger 130 is moved further downward. At this time, with the second region 112 of the needle 110 inserted into the skin 10, the pressure member 140 separates the intervals between each of the needles 110, while forming an expanded expansion hole 11 in the skin 10.

[0076] As described above, during the downward movement of the plunger 130, the gas in the second space 122 moves to the first space 121 through the channel 132, creating a negative pressure in the second space 122, thereby drawing the skin 10 into the second space 122 of the cylinder 120. Consequently, the surface of the skin 10 drawn into the second space 122 of the cylinder 120 becomes flat, allowing for easy insertion of the needle 110.

[0077] Furthermore, if the pressure member 140 descends further, then in the state where the second region 112 of each of the needles 110 is inserted into the intrusion hole, as... Figure 6 As shown, the front ends of the second region 112 of each of the needles 110 are spaced apart from each other and form an expansion hole 11 in the skin 10.

[0078] With the needle 110 inserted into the skin 10 to form an expansion hole 11, the medication 20 applied to the skin 10 is injected deeper into the skin 10 through the expansion hole 11. At this time, the control unit 40 can also control the medication supply unit to supply the medication 20 to the skin 10 located at the tip region of the needle 110 through the connecting passage 150a. Alternatively, the control unit 40 can control the medication supply unit to supply the medication 20 to the first space 121 instead of through the connecting passage 150a, thereby supplying the medication 20 to the skin 10 through the channel 132 and the second space 122 and through the medication discharge hole 145.

[0079] Furthermore, with the needle 110 inserted into the skin 10 to form an expansion hole 11, the control unit 40 can control the power supply unit to apply current to the needle 110. By utilizing the heat generated by the current applied to the needle 110, collagen, elastin fibers, etc., of the skin can be removed, skin regeneration can be promoted, and skin pigmentation, acne scars, and wrinkles can be improved.

[0080] Among them, such as Figure 6 As shown, drug 20 will not be further supplied to skin 10 through connecting pathway 150a, such as Figure 7 As shown, while the pressure component 140 of the drug injection needle unit 100 is lowered and the gap between the needles 110 is separated, the fiber laser 50 can be introduced through the communication channel 150a to irradiate the epidermal layer of the skin 10 with laser light to protect the epidermal layer.

[0081] Additionally, with the cylinder 120 tightly pressed against the skin 10, the plunger 130 is moved upward. At this time, as the spacing between each of the needles 110 narrows again, each of the needles 110 presses tightly against each other and is discharged from the skin 10, thereby exposing the expansion hole 11 formed in the skin 10 on the surface of the skin 10.

[0082] In these exposed expansion holes 11, when the plunger 130 moves upward, the gas in the first space 121 of the cylinder 120 moves through the channel 132 to the second space 122 and creates positive pressure in the second space 122, so that the drug 20 applied to the skin 10 or the drug 20 contained in the needle 110 can be injected deeper into the expansion holes 11.

[0083] Therefore, the advantage of the drug injection needle unit according to an embodiment of the present invention is that, after the needle is inserted into the skin, an expansion hole for injecting the drug is formed, thereby expanding the drug injection range of the skin.

[0084] Furthermore, in the above embodiments, although it is shown that the front ends of each of the plurality of needles are closely arranged to form a point on the virtual central axis of the plunger, and the front ends of each of the plurality of needles are closely attached to or separated from each other as the pressure member moves, the present invention is not limited thereto. The plurality of needles may also be arranged separately at the lower end of the plunger, and each of the needles may form an expansion hole in the skin according to the movement and operation of the pressure member.

[0085] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, those skilled in the art will understand that the invention can be implemented in other specific forms without altering the technical concept or essential features of the invention. Therefore, the embodiments described above should be understood as exemplary in all respects, and not limiting.

Claims

1. A drug injection needle unit, comprising: cylinder; The plunger is configured to reciprocate within the cylinder; Multiple needles are arranged to connect to the plunger so that at least a portion of the area is selectively exposed to the outside of the cylinder; as well as A pressurizing component is sandwiched between the plunger and the needle to separate the gaps between the needles exposed outside the plunger. While the needles are inserted into the skin, the medication is injected through an expansion hole formed in the skin, with the tips of the needles spaced apart from each other.

2. The drug injection needle unit according to claim 1, wherein, The pressurizing component includes: A plate is disposed at the lower part of the plunger; An interference portion protrudes from the lower part of the plate and forms a receiving groove for receiving at least a portion of each of the needles; and The connecting portion protrudes from the upper part of the plate to selectively insert into an extension protruding from the lower center of the plunger.

3. The drug injection needle unit according to claim 2, wherein, The cylinder includes: At least one guide portion protrudes on the inner circumferential surface in a manner corresponding to the moving direction and range of movement of the pressurizing component. The plate includes: A guide groove is formed on the outer peripheral surface such that at least a portion of the guide portion can be inserted. The plate is guided to reciprocate inside the cylinder by the guide.

4. The drug injection needle unit according to claim 3 further comprises: An elastic component is sandwiched between the plunger and the pressurizing component and generates elastic force to bring the pressurizing component closer to each other.

5. The drug injection needle unit according to claim 4, further comprising: A lever connects the actuator for raising and lowering the pressurizing component to the pressurizing component. If the rod causes the pressurizing component to descend, the elastic component connected to the pressurizing component will also descend by pulling the plunger until the plunger contacts the upper end of the guide portion. After the plunger has descended, if the rod descends further, only the pressurizing component descends further, while the interference portion separates the tip of the needle.

6. The drug injection needle unit according to claim 5, wherein, The needle includes: First region; and The second region curves from the first region. Wherein, when the first region is housed in the receiving groove, the first region is formed at the same angle as the inner circumferential surface of the receiving groove, and the second region is formed at a different angle from the inner circumferential surface of the receiving groove.

7. The drug injection needle unit according to claim 5, wherein, The needle is connected in a manner that allows it to be tilted from the plunger.

8. The drug injection needle unit according to claim 2, wherein, The cylinder includes: A first space is arranged above the plunger; and The second space is located at the lower part of the plunger. The plunger includes: The passage connects the first space and the second space.

9. The drug injection needle unit according to claim 8, wherein, The pressurizing component includes: Multiple drug discharge holes are formed through the plate to allow drugs supplied through the channels to be discharged toward the skin in a second space.

10. The drug injection needle unit according to claim 2, wherein, The pressurizing component includes: Multiple needle insertion holes penetrate the plate, such that each of the needles is connected to the plunger.

11. The drug injection needle unit according to claim 5, further comprising: A connecting passage is formed in communication between the pressurizing component and the rod to allow access for a fiber laser for supplying medication to the tip region of the needle or for irradiating the epidermal layer of the skin.

12. A skin treatment device comprising a drug injection needle unit according to any one of claims 1 to 11.

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