Drug spray device

Abstract

The present invention has been made in order to solve the problems of the prior art as described above and is to provide a device for spraying a drug without a needle to inject the drug into the body of a person to be treated, wherein even after the device is used many times or for long time, the device for spraying a drug can steadily maintain drug spray performance without reduction in pressure for spraying a drug. The drug spray device comprises a packing guard member which is provided at the rear end of a drug chamber to pack the drug chamber, and is pushed inward into the drug chamber by the elasticity of the edge portion thereof as a piston applies pressure thereto, thereby delivering the drug filled in the drug chamber to a nozzle tip.

Description

Drug dispensing device

[0001] The present invention relates to a drug injection device that injects a drug into the body of a treatment subject without a needle, by driving a piston to operate inside the device and enabling the injection of a drug by the operation of the piston.

[0002] Drug injectors, also known as needleless syringes, are medical devices that deliver medication without using traditional subcutaneous needles. Needleless syringes utilize high-pressure technology to eject a liquid stream of medication to penetrate the skin.

[0003] A standard needleless syringe pushes medication through a nozzle using a piston. These needleless syringes are gaining popularity due to their advantages, such as providing better administration effects compared to conventional needle syringes, allowing people who are afraid of needles to undergo vaccinations without fear, and reducing medical waste.

[0004] As such, various methods are used as mechanisms to operate the piston to spray the drug, including methods utilizing the pressure of compressed air or combustion gases, methods utilizing the elastic force of a spring, and methods utilizing the magnetic force of a solenoid coil.

[0005] In this regard, prior art documents such as US Published Patent US 2016-0199579 and US Published Patent US 2004-0158195 have been disclosed.

[0006] In any method, a piston is moved to pressurize the interior of a space containing the drug to be injected, and the drug is injected by that pressure. Conventionally, a thin elastic membrane was installed between the drug-containing space and the cylinder through which the piston moves, and the configuration involved moving the piston to pressurize the elastic membrane, thereby pushing the drug in the drug-containing space for injection.

[0007] In this regard, prior art documents such as Korean Registered Patent Publication No. 10-2093951 and Korean Published Patent Publication No. 2021-0070883 have been disclosed.

[0008] However, since drug injection devices typically perform thousands to tens of thousands of drug injections, there is a problem in that the elastic membrane loosens or loses elasticity during this process, causing a drop in pressure and a decrease in the efficacy of the drug injection; additionally, there was a problem in that the elastic membrane tears as the piston repeatedly pushes against the thin elastic membrane.

[0009] [Prior Art Literature]

[0010] US Patent Publication US 2016-0199579

[0011] US Patent Publication US 2004-0158195

[0012] Korean Registered Patent Publication No. 10-2093951

[0013] Korean Patent Publication No. 2021-0070883

[0014] The present invention aims to solve the problems of the conventional technology described above and to provide a drug injection device capable of consistently maintaining drug injection performance without decreasing the pressure for drug injection even when used frequently or for a long period of time, in a device for injecting drugs into the body of a treatment subject by spraying without a needle.

[0015] A drug injection device according to one embodiment of the present invention comprises: a handpiece case; a handpiece having a driving cylinder provided inside the handpiece case and an operating cylinder provided at the tip of the driving cylinder; a plunger driven and moved inside the driving cylinder; a piston operated by the plunger inside the operating cylinder; a drug cylinder having a drug chamber that is detachably coupled to the tip of the handpiece and receives a drug supplied from a drug supply unit; a nozzle tip detachably coupled to the tip of the drug cylinder and sprays the drug from the drug chamber to the outside; and a packing guard member provided at the rear end of the drug chamber, which packs the drug chamber and is pushed inward into the drug chamber by the elasticity of its rim portion as the piston applies pressure, thereby delivering the drug filled in the drug chamber to the nozzle tip.

[0016] Additionally, preferably, the drug cylinder comprises a cylinder body forming the drug chamber and a cap body coupled to the rear end of the cylinder body and coupled to the front end of the handpiece, and the packing guard member is provided to pack the circumference of the drug chamber between the cylinder body and the cap body.

[0017] Additionally, preferably, the packing guard member is characterized by being integrally formed with a rigid pushing guard that is not deformed by the pressure applied by the piston, and an elastic support rim provided on the edge of the pushing guard, which is packed around the opening of the drug chamber and provides elasticity to the movement of the pushing guard.

[0018] Additionally, preferably, the pushing guard is characterized by being formed with a size such that it can be inserted a predetermined distance from the opening of the drug chamber into the inside of the drug chamber as the piston applies pressure from the rear.

[0019] Additionally, preferably, the pushing guard is characterized in that the rear surface contacted by the tip of the piston forms a concave surface with a curvature corresponding to the curvature of the tip of the piston, and the surface facing the drug chamber forms a convex surface.

[0020] Additionally, preferably, the elastic support rim is characterized by being integrally formed with a packing edge that is fitted into a packing fixing groove formed around the perimeter of the drug chamber to pack the inside of the drug chamber, and an elastic connecting part that connects the packing edge and the pushing guard and expands and contracts according to the movement of the pushing guard to elastically support the pushing guard.

[0021] Additionally, preferably, the packing guard member is characterized by being formed by integrating the hard pushing guard and the elastic support rim of an elastic material by double injection molding.

[0022] Meanwhile, a drug injection device according to another embodiment of the present invention comprises: a handpiece case, a handpiece having a driving cylinder provided inside the handpiece case and an operating cylinder provided at the tip of the driving cylinder; a plunger driven and moved inside the driving cylinder; a piston operated by the plunger inside the operating cylinder; a drug cylinder having a drug chamber that is detachably coupled to the tip of the handpiece and receives a drug supplied from a drug supply unit; a nozzle tip detachably coupled to the tip of the drug cylinder and sprays the drug from the drug chamber to the outside; an elastic support rim member made of an elastic material that is packed and coupled to the perimeter of the drug chamber and has a central opening of a predetermined size; and a pushing guard member that is seated in the opening of the elastic support rim member and coupled to the rear surface of the elastic support rim member, and is pushed into the inside of the drug chamber by the elasticity of the elastic support rim member as the piston applies pressure, thereby delivering the drug filled in the drug chamber to the nozzle tip.

[0023] The drug injection device according to the present invention is a device that injects a drug into the body of a treatment subject by spraying it without a needle, and has the effect of improving product reliability by ensuring that the pressure for drug injection does not decrease even with frequent use or prolonged use, and that the performance of drug injection can be consistently maintained.

[0024] FIG. 1(a) shows a state in which the handpiece and the drug spray head of a drug spray device according to one embodiment of the present invention are separated, and FIG. 1(b) shows a state in which the drug spray head is coupled to the handpiece shown in FIG. 1(a).

[0025] Figure 2 shows a cross-section II of the handpiece and drug injection head of the drug injection device shown in Figure 1(a) in a separated state.

[0026] FIG. 3 is a diagram showing the main components of the drug injection head (300) illustrated in FIG. 2 in disassembly.

[0027] Figure 4 is an enlarged view of the cross-section II-II and the drug chamber portion of the drug injection device shown in Figure 1(b).

[0028] FIG. 5 shows the operation of a plunger, a piston, and a packing guard member for injecting a drug in a drug injection device according to an embodiment of the present invention shown in FIG. 4.

[0029] FIG. 6 shows the return operation of the packing guard member, piston, and plunger after the operation for drug injection of the drug injection device shown in FIG. 5.

[0030] FIG. 7 illustrates a configuration in which, instead of a packing guard member used in a drug injection device according to one embodiment of the present invention, an elastic support rim member and a pushing guard member are each provided as independent structures and combined with each other to perform the same function as the packing guard member.

[0031] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0032] Where it is stated that one component is "connected," "combined," or "joined" to another component, it should be understood that while the components may be directly connected or joined to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "joined" through another component.

[0033] As used in this specification, singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, terms such as “composed” or “comprising” should not be interpreted as necessarily including all of the various components or steps described in the specification, and should be interpreted as meaning that some of the components or steps may be omitted or additional components or steps may be included.

[0034] Hereinafter, specific details regarding the drug injection device according to the present invention will be described in detail with reference to the drawings.

[0035] First, the configuration of a drug injection device according to one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

[0036] FIG. 1(a) shows a state in which the handpiece (100) and the drug injection head (300) of a drug injection device according to one embodiment of the present invention are separated, and FIG. 1(b) shows a state in which the drug injection head (300) is coupled to the handpiece (100) shown in FIG. 1(a). FIG. 2 shows a cross-section II of the drug injection device in the separated state of the handpiece and the drug injection head shown in FIG. 1(a). FIG. 3 is a disassembled view showing the main components of the drug injection head (300) shown in FIG. 2. FIG. 4 is an enlarged view showing the cross-section II-II and the drug chamber portion of the drug injection device shown in FIG. 1(b).

[0037] A drug injection device according to one embodiment of the present invention is a device for administering a drug into the skin for skin treatment of a patient, and is capable of injecting the drug into the skin without an injection needle.

[0038] For example, when injecting a filler into the skin of a patient, the filler can be injected into the skin without a needle by using a drug injection device according to one embodiment of the present invention.

[0039] A drug injection device according to one embodiment of the present invention may be configured to include a handpiece (100) that can be held by a practitioner's hand, and a drug injection head (300) coupled to the tip of the handpiece (100). The drug injection head (300) is replaceable as a consumable and is detachably coupled to the tip of the handpiece (100).

[0040] The drug injection head (300) may be configured to include a drug cylinder (200) having a drug chamber to be described later, and a nozzle tip (310) coupled to the tip of the drug cylinder (200).

[0041] The nozzle tip (310) can be detachably coupled to the tip of the drug cylinder (200), and the drug cylinder (200) can be detachably coupled to the tip of the handpiece (100).

[0042] As illustrated in FIGS. 2 and 3, the drug cylinder (200) may be configured to have a cylinder body (210), a drug supply head (230) provided on one side of the cylinder body (210), and a cap body (220) coupled to the rear end of the cylinder body (210).

[0043] A drug supply head (230) coupled to a drug cylinder (200) is for supplying a drug from an external drug source into the cylinder body (210), and the drug supply head (230) may be provided with a drug source coupling part (232) to enable coupling to a drug source.

[0044] The cylinder body (210) is provided with a drug chamber (216) that receives a drug supplied from a drug supply head (230).

[0045] The drug supply head (230) may be equipped with a drug source coupling part (232) to which an external drug source is connected, and a drug injection part (212) to which a drug is injected from the drug source into the drug chamber (216). A syringe, ampoule, or vial in which a drug is stored may be coupled to the drug source coupling part (232) as a drug source.

[0046] The drug injection part (212) is equipped with an injection part valve (234), which is a one-way valve that opens when the drug is supplied from the drug source coupling part (232) and closes when the drug is not supplied, thereby preventing the drug stored in the drug chamber (216) from flowing back toward the drug supply head (230).

[0047] As shown in FIG. 3, an outlet (214) of the drug chamber (216) is formed at the front end of the drug chamber (216) formed in the cylinder body (210) and communicates with a drug delivery hole (312) formed in the nozzle tip (310). A spring (322) and an opening / closing member (321) are provided at the drug delivery hole (312) and the outlet (214), and a packing guard member (250) may be provided at the rear end of the drug chamber (216), that is, at the inlet (217) of the drug chamber.

[0048] As shown in FIG. 3, a spring (322) is installed in the drug delivery hole (312) of the nozzle tip (310) which is in communication with the outlet (214) of the drug chamber (216), and an opening / closing member (321) may be provided to block the outlet (214) of the drug chamber (216) by the elastic force of the spring (322) installed in the drug delivery hole (312). The opening / closing member (321) is equipped with a body part (VB) fitted onto a spring (322) and a head part (VH) positioned at the outlet of the drug chamber (216). Since the head part (VH) is pushed by elastic force while the spring (322) is compressed in a predetermined state in the drug delivery hole (312), and the head part (VH) blocks the outlet (214) of the drug chamber (216), the drug inside the drug chamber (216) is prevented from leaking toward the nozzle tip. Additionally, since the inlet of the drug chamber (216) is sealed by a packing guard member (250), the drug inside the drug chamber (216) is prevented from leaking toward the handpiece.

[0049] The outlet (214) of the drug chamber is formed (215) such that the diameter of the hole gradually increases as it moves forward from the drug chamber (216), so that the outlet (214) can be easily opened and closed as the hemispherical shape of the head portion (VH) of the opening / closing member (321) moves back and forth.

[0050] In this state, when the pushing guard (252) of the packing guard member (250) moves into the drug chamber (216) by the piston and pressurizes it, the head part (VH) of the opening / closing member (321) further compresses the spring (322) due to that pressure, thereby opening the outlet (214) of the drug chamber (216) so that the drug is delivered to the drug delivery hole (312) and sprayed out through the nozzle (330).

[0051] As illustrated in FIGS. 2 to 4, a cap body (220) provided at the rear end of a drug cylinder (200) can be inserted between an operating cylinder (110) provided at the front of a handpiece (100) and a front case (115) to be coupled. At this time, a piston hole (225) is formed inside the cap body (220), and as the cap body (220) is coupled to the front case (115) of the handpiece, the operating cylinder (110) and the piston hole (225) are connected, so that the front end (151) of the piston (150) is positioned inside the piston hole (225), allowing the piston (150) to move within the piston hole (225) and the operating cylinder (110).

[0052] The handpiece (100) is the part that the operator holds in their hand. The drug cylinder (200) receives and receives drug through a drug source (not shown) connected to the drug source coupling part (232) of the drug supply head (230), and the tip (151) of the piston (150) provided inside the handpiece (100) pressurizes the drug contained in the drug cylinder (200) and delivers it to the nozzle tip (310) through the drug delivery path. The nozzle tip (310) sprays the drug delivered from the drug cylinder (200) through the nozzle (330) by the pressurizing force of the piston (150).

[0053] The piston (150) of the handpiece (100) can repeatedly pressurize the drug cylinder (200) at high speed, and accordingly, drug can be sprayed repeatedly at high speed through the nozzle (330).

[0054] As illustrated in FIGS. 2 to 4, a handpiece (100) of a drug injection device according to one embodiment of the present invention comprises a handpiece case (101) forming an exterior, a driving cylinder (140) mounted inside the handpiece case (101), and an operating cylinder (110) mounted at the tip of the driving cylinder (140) inside the handpiece case (101).

[0055] A cable (not shown) is connected to the rear end of the handpiece case (101) to transmit electrical signals for power and control to the handpiece case (101). An operating cylinder (110) may be provided at the front end of the driving cylinder (140) to guide the piston (150) to move forward and backward. The operating cylinder (110) may be provided by combining a first operating cylinder (112) and a second operating cylinder (114), or the first operating cylinder (112) and the second operating cylinder (114) may be integrated to form a single component.

[0056] As illustrated in FIGS. 2 and 4, the piston (150) is provided inside the first operating cylinder (112) and the second operating cylinder (114), and the piston protrusion (153) may be positioned between the piston stopper (122) provided in the first operating cylinder (112) and the piston seat (123) provided in the second operating cylinder (114).

[0057] Accordingly, when the piston (150) moves forward, the movement of the piston projection (153) is restricted by the piston stopper (122), and when the piston (150) moves backward, the movement of the piston projection (153) is restricted by the piston seat (132), so that the piston (150) can move forward or backward by the distance the piston projection (153) moves between the piston stopper (122) and the piston seat (132).

[0058] A driving cylinder (140) may be provided at the rear of the above-mentioned operating cylinder (110), and the rear end of the piston (150) may be positioned in the driving cylinder (140).

[0059] A plunger seat (142) is disposed at the rear end of the driving cylinder (140). A plunger (144) is provided between the rear end (152) of the piston and the plunger seat (142) inside the driving cylinder (140) so as to be able to advance and retract a predetermined distance, and a solenoid coil (146) is disposed on the outer surface of the driving cylinder (140).

[0060] Inside the drive cylinder (140), the plunger seat (142) and the rear end (152) of the piston (150) are separated by a predetermined distance, and the plunger (144) can move by that distance.

[0061] The plunger seat (142) may be a permanent magnet. The plunger seat (142) may be fixed inside the rear end of the drive cylinder (140), and the solenoid coil (146) may be wound and positioned on the outer surface of the front part of the drive cylinder (140) and configured to be insulated so as not to be affected even if liquid is present outside.

[0062] As current is applied to the solenoid coil (146) wound on the outer circumference of the front part of the driving cylinder (140), a magnetic field is generated inside and around the coil (146), that is, inside and around the front side of the driving cylinder (140). The direction of the magnetic field changes depending on the direction of the current applied to the solenoid coil (146), and the plunger (144) provided inside the driving cylinder (140) can move forward or backward depending on the direction of the magnetic field generated by the solenoid coil (146).

[0063] The plunger (144) may be a permanent magnet that is provided inside the driving cylinder (140) and can move according to the magnetic field of the solenoid coil (146). The plunger (144) is positioned between the rear end of the piston (150) and the plunger seat (142). The plunger (144) advances by the solenoid coil (146) to apply an impact force to the rear end (152) of the piston (150), and the piston (150) can move forward by that force.

[0064] The plunger (144) can be pushed backward by the piston (150) as the piston (150) moves backward. The plunger (144) moves backward by the piston (150) and comes into contact with the plunger seat (142). At this time, the mutually facing surfaces of the plunger seat (142), which is a permanent magnet, and the plunger (144), which is a permanent magnet, can each have different polarities so that the plunger (144) can be attached to the plunger seat (142) by magnetic force.

[0065] In this state, when a predetermined current is applied to the solenoid coil (146), the plunger (144) moves toward the piston (150) by the magnetic field generated in the driving cylinder (140), applying an impact force to the rear end (152) of the piston, and the piston (150) moves forward by that impact force. After the piston moves forward, if the application of current to the solenoid coil (146) is stopped or a current in the opposite direction is applied, the piston (150) moves backward, pushing the plunger (144) back toward the plunger seat (142), and the plunger (144) moving accordingly can be reattached to the plunger seat (142) by magnetic force. In this way, the plunger (144) can repeatedly move forward and backward at high speed to repeatedly advance the piston (150).

[0066] The plunger (144) may be formed with a hollow interior, thereby reducing the impact that may occur when the plunger (144) is attached to the plunger sheet (142). The plunger sheet (142) or the plunger (144) may be provided with a cushioning member to further reduce the impact that may occur when the plunger (144) is attached to the plunger sheet (142).

[0067] The plunger (144) described above may be implemented as an electromagnet so that the polarity of the plunger (144) changes when current is applied to the solenoid coil (146). The faces of the plunger (144) and the plunger sheet (142) facing each other have different polarities and attract each other, but when current is applied to the solenoid coil (146) and a magnetic field is generated, the plunger (144) also changes its polarity so that the faces of the plunger (144) and the plunger sheet (142) face each other with the same polarity, thereby allowing the plunger (144) to be pushed forward by the repulsive force between the plunger sheet (142) and the plunger (144), and accelerated forward by the magnetic force of the solenoid coil (146).

[0068] That is, when a repulsive force is generated between the plunger (144) and the plunger seat (142), the plunger (144) is separated from the plunger seat (142) by the repulsive force with the plunger seat (142) and can be moved toward the front side of the driving cylinder (110) by the repulsive force with the plunger seat (142) and the magnetic force from the solenoid coil (146). At this time, since the plunger (144) is moved toward the front side of the driving cylinder (140) by receiving a combination of the repulsive force with the plunger seat (142) and the magnetic force from the solenoid coil (146), the movement can be further accelerated.

[0069] After the plunger (144) applies an impact force to the piston (150) to move the piston (150), the piston (150) moves backward due to elasticity and pushes the plunger (144). The plunger (144) then changes its polarity again so that the mutually facing surfaces of the plunger (144) and the plunger seat (142) each have the same polarity, allowing the plunger (144) to reattach to the plunger seat (142) by the pulling force of the plunger seat (142).

[0070] The plunger (144) may be composed of a permanent magnet, and the plunger sheet (142) may be composed of an electromagnet. The plunger sheet (142) composed of an electromagnet attracts the plunger (144) by magnetic force by having a polarity different from the opposite part of the plunger (144) before current is applied to the solenoid coil (146), and when current is applied to the solenoid coil (146), the polarity can be changed to have the same polarity as the opposite part of the plunger (144). As the polarity of the plunger sheet (142) changes in this way, a repulsive force is generated between the plunger (144) and the plunger sheet (142), causing the plunger sheet (142) to push the plunger (144), and the plunger (144) can be accelerated forward and moved by the magnetic field generated by the solenoid coil (146).

[0071] When the plunger (144) retracts after the piston operation, the polarity of the plunger seat (142) is changed again to attract the plunger (144) with magnetic force so that the plunger (144) comes into contact with the plunger seat (142), thereby ensuring sufficient travel distance of the plunger (144).

[0072] Meanwhile, in the drug cylinder (200) which is detachably coupled to the tip of the handpiece (100), drug supply from the drug supply head (230) and drug delivery to the nozzle tip (310) are performed. The drug cylinder (200) is a consumable and can be separated from the handpiece (100) and replaced.

[0073] A drug delivery hole (with a spring (322) and an opening / closing member (321) installed) connected to a nozzle tip (310) is provided at the front end of a drug chamber (216) formed in the cylinder body (210) of a drug cylinder (200), and a packing guard member (250) may be provided at the rear end of the drug chamber (216). The configuration of the packing guard member (250) is specifically shown in FIG. 3, and the state in which the packing guard member (250) is mounted is specifically shown in FIG. 4.

[0074] As illustrated in FIG. 3, the packing guard member (250) is provided at the rear end of the drug chamber (216), i.e., the inlet (217), to seal the drug chamber (216), and is a component that pushes into the inside of the drug chamber (216) by the elasticity of the rim portion as the piston applies pressure, thereby delivering the drug (DS) filled in the drug chamber (216) to the nozzle tip (310).

[0075] The packing guard member (250) is provided between the cylinder body (210) and the cap body (220) and packs the circumference of the drug chamber (216) to seal it.

[0076] As illustrated in FIGS. 3 and 4, the packing guard member (250) may be formed by integrating a hard pushing guard (252) that is not deformed by the pressure applied by the piston (150) and an elastic support rim (254, 256) that is provided on the edge of the pushing guard (252), is packed around the opening of the drug chamber (216), and provides elasticity to the movement of the pushing guard (252).

[0077] The pushing guard (252) can be formed with a size that allows it to be inserted inward a predetermined distance from the opening (217) of the drug chamber (216) as the piston (150) applies pressure from the rear. The section in which the pushing guard (252) can be inserted into the drug chamber (216) may vary depending on the size of the pushing guard (252). It is preferable to pre-set a size corresponding to the size of the tip portion (151) of the piston (150) so that sufficient injection pressure can be produced as the drug is inserted into the drug chamber (216) and pressurized, and to provide the pushing guard with that pre-set size.

[0078] The pushing guard (252) is configured such that the rear surface to which the tip (151) of the piston (150) contacts forms a concave surface with a curvature corresponding to the curvature of the tip (151) of the piston (150), and the surface facing the drug chamber (216) forms a convex surface, so that the tip (151) of the piston is seated on the concave surface of the pushing guard (252) and the convex surface pressurizes the inside of the drug chamber (216).

[0079] The elastic support rim surrounding the pushing guard (252) includes an elastic connecting part (254) that is integrated with the pushing guard (252) and forms a rim around the rim, made of a material that expands and contracts due to elasticity such as rubber, and a packing edge (256) formed thicker than the elastic connecting part (254) at the edge around the rim of the elastic connecting part (254).

[0080] The packing edge (256) of the elastic support rim is fitted into and packed into the packing fixing groove (219) formed around the drug chamber (216) to seal the inside of the drug chamber (216), and the elastic connecting part (254) connects the packing edge (256) and the pushing guard (252) and covers the protruding ridge (218) formed between the entrance (217) of the drug chamber (216) and the packing fixing groove (219), thereby expanding and contracting as the pushing guard (252) moves into and out of the drug chamber (216), elastically supporting the pushing guard (252).

[0081] The packing guard member (250) described above can be formed by integrating a hard pushing guard (252) and an elastic support rim (254, 256) made of an elastic material by double injection molding.

[0082] The packing guard member (250) seals the drug chamber (216) by the configuration described above to prevent the drug inside the drug chamber (216) from flowing toward the handpiece, and as the piston (150) presses the pushing guard (252), the pushing guard (252) is drawn into the drug chamber (216) by the elasticity of the elastic connecting part (254) to transmit the pressurizing force so that drug injection is performed.

[0083] As shown in FIG. 4, when the drug cylinder (200) is coupled to the tip of the handpiece (100), the cap body (220) is fitted and coupled to surround the first operating cylinder (112) of the handpiece (100), so that the tip portion (151) of the piston (150) is seated on the concave surface of the pushing guard (252) of the packing guard member (250).

[0084] Accordingly, the tip (151) of the piston (150), which is driven and moved from the handpiece (100), presses the pushing guard (252) of the packing guard member (250). Since the pushing guard (252) is a rigid structure whose shape is not substantially deformed by pressure, it is drawn directly into the drug chamber (216) according to the pushing force of the piston to pressurize the drug.

[0085] Therefore, even if the number of uses increases significantly or the usage period increases drastically, the shape of the pushing guard (252) does not change due to its material characteristics, so it has the characteristic of being able to solve the problem of reduced elasticity and reduced pressure, as in conventional elastic membranes.

[0086] When the pushing guard (252) of the packing guard member (250) pressurizes the drug in the drug chamber (216) by means of the piston, the opening / closing member (321) provided at the outlet (214) of the drug chamber (216) moves due to the pressure, causing the outlet (214) to open, and accordingly, the drug can be delivered to the nozzle (330) through the drug delivery hole (312).

[0087] And the pushing guard (252) of the packing guard member (250) returns to the elasticity of the elastic support rim (254, 256) and pushes the piston (150) toward the handpiece, and the rear end (152) of the piston (150) pushes the plunger (144), allowing the plunger (144) to move to the plunger seat (142).

[0088] The drug chamber (216) is in communication with the drug injection part (212) of the drug supply head (230) and is also in communication with the drug delivery hole leading to the nozzle tip (310). As described above, when the piston (150) pressurizes the pushing guard (252) of the packing guard member (250), the volume of the drug chamber (216) decreases rapidly and the internal pressure increases, so the drug inside the drug chamber (216) can move toward the nozzle and toward the drug injection part (212), respectively. However, since the drug injection part (212) of the drug supply head (230) is equipped with an injection part valve (234) which is a one-way valve, the drug inside the drug chamber (216) cannot go toward the drug injection part (212) and can be delivered to the nozzle tip (310).

[0089] After the packing guard member (250) is pressurized by the piston (150), the packing guard member (250) pushes the piston (150) with elastic force, causing the volume inside the drug chamber (216) to increase rapidly again and the internal pressure to decrease. Accordingly, the valve of the drug injection part (212) of the drug supply head (230) is opened, and the drug can be supplied from the drug source to the drug chamber (216) and filled.

[0090] A nozzle tip (310) coupled to the tip of a drug cylinder (200) is equipped with a nozzle (330) that sprays the drug delivered from the drug chamber (216).

[0091] When the piston (150) pushes the pushing guard (252) of the packing guard member (250) to apply pressure to the drug chamber (216), the opening / closing member (321) opens due to the pressure, and the drug can be sprayed through the nozzle (330). After pressurizing the drug chamber (216), when the pushing guard (252) of the packing guard member (250) pushes the piston (150) with the elastic force of the elastic support rim (254, 256), the pressure inside the drug chamber (216) is lowered, and the inlet valve (234) of the drug inlet part (212) of the drug supply head (230) opens, so that the drug is supplied from the drug source to the drug chamber (216) and filled, and at the same time, the opening / closing member (321) blocks the outlet of the drug chamber (216) by the spring (322), so that the drug inside the drug chamber (216) can be sealed and contained.

[0092] The nozzle (330) of the nozzle tip (310) is the end of the drug being sprayed, and can be formed in various shapes to control the spraying distance, intensity, and thickness of the drug. Since the viscosity or density varies depending on the type of drug, various nozzle tips equipped with various shapes of nozzles can be provided so that the spraying distance, intensity, and thickness of the drug can be controlled by replacing the necessary nozzle tip.

[0093] More specific details regarding the operation of a drug injection device according to one embodiment of the present invention as described above and the operation of a packing guard member therein will be explained with reference to FIGS. 4 to 6.

[0094] FIG. 4 shows a side cross-sectional view of a drug injection device according to an embodiment of the present invention as described above, FIG. 5 shows the operation of a plunger and a piston for injecting a drug in the drug injection device according to an embodiment of the present invention shown in FIG. 4, and FIG. 6 shows the return operation of the piston and the plunger after the operation for injecting a drug in the drug injection device shown in FIG. 5.

[0095] As shown in FIG. 4, in the pre-operation state, the plunger (144) and the plunger seat (142) inside the handpiece (100) are attached to each other by magnetic force, and the drug cylinder (200) is coupled to the tip of the handpiece (100), so that the tip (151) of the piston (150) is seated on the rear surface, i.e., the concave surface, of the pushing guard (252) of the packing guard member (250).

[0096] As shown in FIG. 5, when the nozzle (330) end is in close contact with the treatment target (person or animal) and current is applied to the solenoid coil (146) of the driving cylinder (140), a magnetic field is generated and the plunger (144) moves forward by the magnetic field and strikes the rear end (152) of the piston (150).

[0097] The piston (150) moves forward by the impact of the plunger (144), and the tip portion (151) of the piston (150) pushes the pushing guard (252) of the packing guard member (250) that is packing the inlet of the drug chamber (216) of the drug cylinder (200), causing the pushing guard (252) to be drawn into the drug chamber (216) and pressurize the drug inside. At this time, since the pushing guard (252) is a rigid structure without elasticity, it is not deformed by the piston (150) and is drawn into the drug chamber (216) in its original state, and the elastic connecting portion (254) connected to the pushing guard (252) stretches due to elasticity and elastically supports the pushing guard (252).

[0098] As the pushing guard (252) of the packing guard member (250) is inserted, the pressurized drug pushes the opening / closing member (321) to open the outlet of the drug chamber (216), and the drug coming out of the outlet of the drug chamber (216) is transferred to the nozzle tip (310) and strongly sprayed through the nozzle (330) to be injected into the body of the treatment target.

[0099] And, as illustrated in FIG. 6, the pushing guard (252) returns to its original position by the elastic restoring force of the elastic connecting part (254) of the packing guard member (250), thereby pushing the piston (150) backward, and accordingly, the rear end of the piston (150) pushes the plunger (144) backward and moves toward the plunger seat (142). At this time, the plunger (144) and the plunger seat (142) are attached by magnetic force. In this case, the application of current to the solenoid coil (146) may be interrupted, or a current in the opposite direction to that applied when advancing the plunger (144) may be applied to cause the plunger (144) to retract.

[0100] As described above, as the pushing guard (252) returns to its original position, the pressure inside the drug chamber (216) is lowered, so drug supply (ST) is provided from the drug supply head (230) to the drug chamber (216), and drug (DS) can be filled inside the drug chamber (216).

[0101] In this way, drug injection can be performed repeatedly by repeating the drive of the plunger and the movement of the piston.

[0102] Meanwhile, in the embodiments illustrated in FIGS. 2 to 6 above, a case was described in which the packing guard member is formed by double injection molding of a hard material forming the pushing guard and an elastic material forming the elastic support rim, but the present invention is not limited thereto and may include a case in which the elastic support rim and the pushing guard are each formed as independent structures combined with each other.

[0103] FIG. 7 illustrates a configuration in which, instead of a packing guard member used in a drug injection device according to one embodiment of the present invention, an elastic support rim member and a pushing guard member are each provided as independent structures and combined with each other to perform the same function as the packing guard member.

[0104] As illustrated in FIG. 7, a drug injection device according to one embodiment of the present invention may separately provide an elastic support rim member (400) and a pushing guard member (500) as packing and pressurizing means for the drug chamber.

[0105] The elastic support rim member (400) is made of a material that expands and contracts due to elasticity, such as rubber, and is implemented in a ring shape with an open center. It is equipped with a packing edge (410) forming the outer part and an elastic connecting part (420) extending inward, and a coupling groove (422) may be formed on the rear surface of the elastic connecting part (420).

[0106] The pushing guard member (500) is made of a hard material that does not undergo elastic deformation and may be equipped with a pushing dome (510) formed in a dome shape in the center and a connecting part (520) formed around the perimeter.

[0107] As shown in FIG. 7(a), the packing edge (410) of the elastic support rim member (400) is inserted into the packing fixing groove (218) formed around the drug chamber (216) to form a packing connection, and then the pushing dome (510) of the pushing guard member (500) is inserted into the central opening of the elastic support rim member (400), and the connecting part (520) of the pushing guard member (500) is inserted into the connecting groove (422) formed on the rear of the elastic connecting part, thereby connecting the pushing guard member (500) to the elastic support rim member (400) as shown in FIG. 7(b), so that the whole can perform the role of a single packing guard member as described above.

[0108] Here, it goes without saying that the coupling groove (422) formed in the elastic support rim member and the coupling part (520) formed in the pushing guard member can be formed opposite to each other.

[0109] Since the combined component of the elastic support rim member (400) and the pushing guard member (500) as shown in FIG. 7 performs substantially the same function and operation as the pushing guard member described above, the description of the function and operation of the combined component of the elastic support rim member (400) and the pushing guard member (500) will be omitted.

[0110] As described above, the drug injection device according to the present invention is a device for injecting a drug into the body of a treatment subject by spraying it without a needle. Since drug injection is achieved by utilizing a pushing guard member in which a rigid pushing guard and an elastic support rim made of an elastic material are integrated, or by a mechanical combination configuration of a rigid pushing guard member and an elastic support rim made of an elastic material, it has the special advantage of being able to consistently maintain the performance of drug injection without the pressure for drug injection decreasing even with frequent use or prolonged use.

[0111] The drug injection device according to the present invention can be used in medical device-related fields or skin beauty-related fields for administering drugs into the body of a patient.

Claims

1. Handpiece; A piston driven inside the handpiece and moving linearly through the tip of the handpiece; A drug cylinder coupled to the tip of the handpiece and having a drug chamber that receives a drug supplied from a drug supply unit; A nozzle tip coupled to the tip of the above drug cylinder and spraying the drug of the above drug chamber to the outside; and A packing guard member provided at the rear end of the drug chamber, packing the drug chamber, and, as the piston applies pressure, is pushed inward into the drug chamber by the elasticity of the rim portion to deliver the drug filled in the drug chamber to the nozzle tip; A drug injection device including 2. In paragraph 1, the drug cylinder is, It includes a cylinder body forming the above drug chamber and a cap body coupled to the rear end of the cylinder body and coupled to the front end of the handpiece, A drug injection device characterized in that the above packing guard member is provided to pack the circumference of the drug chamber between the cylinder body and the cap body.

3. In paragraph 1, the packing guard member is, A drug dispensing device characterized by being integrally formed with a rigid pushing guard that is not deformed by the pressure applied by the piston and an elastic support rim provided on the edge of the pushing guard, packed around the opening of the drug chamber, and providing elasticity to the movement of the pushing guard.

4. In paragraph 3, the pushing guard is, A drug injection device characterized by being formed with a size that allows it to be inserted a predetermined distance from the opening of the drug chamber into the inside of the drug chamber as the piston applies pressure from the rear.

5. In paragraph 4, the pushing guard is, A drug injection device characterized by being configured such that the rear surface contacted by the tip of the piston forms a concave surface with a curvature corresponding to the curvature of the tip of the piston, and the surface facing the drug chamber forms a convex surface.

6. In paragraph 3, the elastic support rim is, A drug injection device characterized by having an integrally formed packing edge that is fitted into a packing fixing groove formed around the perimeter of the drug chamber to pack the inside of the drug chamber, and an elastic connecting part that connects the packing edge and the pushing guard and expands and contracts according to the movement of the pushing guard to elastically support the pushing guard.

7. In paragraph 3, the packing guard member is, A drug injection device characterized by the hard pushing guard and the elastic support rim made of an elastic material being integrally formed by double injection molding.

8. Handpiece; A piston driven inside the handpiece and moving linearly through the tip of the handpiece; A drug cylinder coupled to the tip of the handpiece and having a drug chamber that receives a drug supplied from a drug supply unit; A nozzle tip coupled to the tip of the above drug cylinder and spraying the drug of the above drug chamber to the outside; An elastic support rim member made of an elastic material, provided at the rear end of the above drug chamber, packed and coupled around the perimeter of the above drug chamber, and having a central opening of a predetermined size; and A pushing guard member that is seated in the opening of the elastic support rim member and coupled to the rear surface of the elastic support rim member, and is pushed into the inside of the drug chamber by the elasticity of the elastic support rim member as the piston applies pressure, thereby delivering the drug filled in the drug chamber to the nozzle tip; A drug injection device including

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