Needleless injector

Abstract

The needleless injector according to the present application is configured to advance the movable magnetic body and the piston by generating a magnetic field by supplying a current to the electromagnetic coil, and to retract the movable magnetic body by the elastic member of the movable magnetic body and to retract the piston by the elastic member of the piston when the current to the electromagnetic coil is cut off, so that the piston for pressurizing the injection medicine can be repeatedly moved forward and backward, and thus a predetermined medicine can be repeatedly injected at a high speed. Also, the present application can minimize the backlash without increasing an additional backlash canceling structure by adjusting the time of the current applied to the electromagnetic coil, so that the usability can be improved while the structure is simple.

Description

[0001] This application is a divisional application of Chinese patent application No. 202180003941.9, filed on March 4, 2021, entitled "Needleless Injector". Technical Field

[0002] This invention relates to needleless syringes, and more specifically to a needleless syringe capable of high-speed, repeated injection of drugs without an injection needle. Background Technology

[0003] Generally, a syringe is a device used to inject medication into the tissues of a living organism. A syringe consists of a needle that is inserted into the body, a syringe containing the medication, and a piston that reciprocates within the syringe to push the medication through the needle. The needle has a needle hole to inject the drug during injection.

[0004] Recently, research and development on needle-free syringes has been active in order to eliminate fear of syringe needles and prevent infections caused by needles.

[0005] However, since existing needleless injectors are designed to inject a predetermined amount of medication into only one spot on the skin at a time, they may cause damage to the skin tissue.

[0006] In addition, due to the inconvenience of needing to reload after each injection, it has limitations in fields such as cosmetic dermatology, as it cannot be used to inject drugs evenly onto large areas of skin multiple times. Summary of the Invention

[0007] Technical issues

[0008] The purpose of this invention is to provide a needleless syringe that can inject small amounts of medication at high speed and repeatedly to uniformly inject them onto a large area of ​​skin.

[0009] Technical solution

[0010] The needleless syringe according to the present invention comprises: a body formed in a hollow shape; an electromagnetic coil wound around the outer peripheral surface of the body; a cylinder connected in communication with the front of the opening of the body, having formed a drug receiving portion for receiving a drug and a nozzle portion for dispensing the drug received in the drug receiving portion forward; a movable magnetic body extending in the length direction and inserted into the interior of the body, which moves forward by magnetic force generated when an electric current is applied to the electromagnetic coil; a piston configured to be inserted into the interior of the body and through the front of the movable magnetic body, so as to move forward by an impact force applied by the movable magnetic body when it moves forward, thereby pressurizing the drug in the drug receiving portion to the nozzle portion; and a piston disposed between the movable magnetic body and the piston, which applies force to the movable magnetic body in the direction of its rearward movement. An elastic member for a movable magnetic body with added elastic force; a communication hole between the nozzle and the drug receiving part, configured to open and close, the communication hole being pushed open by hydraulic pressure applied from the drug receiving part when the piston moves forward, and elastically restoring to close the communication hole when the hydraulic pressure is released; a nozzle opening / closing valve for repeatedly supplying and cutting off current to the electromagnetic coil at a preset cycle to repeatedly move the piston forward and backward, the forward / backward driving member comprising: a current supply part that repeatedly supplies current to the electromagnetic coil to move the movable magnetic body forward when the piston moves forward and cuts off the current to the electromagnetic coil when the piston moves backward; and an elastic member for a piston that applies an elastic force to the piston in the backward direction when the current supply part is cut off.

[0011] The current supply unit applies a current to the electromagnetic coil for a preset first set time and then cuts off the current. The mass of the movable magnetic body is set to be less than 100g and the first set time is less than 250ms.

[0012] The elastic component for the movable magnetic body includes a first coil spring that is compressed when the movable magnetic body moves forward and applies an elastic force to the movable magnetic body in the direction of its backward movement.

[0013] The piston includes a first flange portion formed on the outer circumference of the front portion located inside the cylinder, protruding in a radial direction. The piston is provided with an elastic member including a second coil spring inserted into the piston, with both ends located between the cylinder and the first flange portion, which is compressed when the piston moves forward and applies an elastic force to the first flange portion in the direction of the piston's backward movement.

[0014] The piston has a first flange portion that protrudes radially from the outer periphery of the rear portion located inside the cylinder. The piston is equipped with an elastic member including a third coil spring that is inserted into the piston, with both ends located between the body and the second flange portion, is compressed when the piston moves forward, and applies an elastic force to the second flange portion in the direction of the piston's rearward movement.

[0015] The piston has a first flange portion protruding radially from the outer circumference of the front portion inside the cylinder and a second flange portion protruding radially from the outer circumference of the rear portion inside the body. The piston is provided with elastic components including a second coil spring inserted into the piston, with both ends located between the cylinder and the first flange portion, which is compressed when the piston moves forward and applies an elastic force to the first flange portion in the direction of the piston's rearward movement; and a third coil spring inserted into the piston, with both ends located between the body and the second flange portion, which is compressed when the piston moves forward and applies an elastic force to the second flange portion in the direction of the piston's rearward movement.

[0016] It also includes a stopper located between the piston and the cylinder, which locks the first flange portion to limit the forward movement distance of the piston as it moves forward.

[0017] The stopper includes a fixed stopper that is fixedly disposed on the inner circumferential surface of the cylinder, the inner circumferential surface having a female thread forming an annular shape; and a length adjusting stopper that is engaged with the inner circumferential surface of the fixed stopper and is configured to lock the first flange portion when the piston moves forward, and is capable of adjusting the engagement length of the screw with the fixed stopper.

[0018] The drug receiving section is formed into a diffuser nozzle shape comprising a narrow section with a decreasing cross-sectional area toward the front and an enlarged section extending from the narrow section and having an increased cross-sectional area again. The narrow section is formed with a drug supply port for receiving drugs from the outside through the pressure difference generated when the piston moves backward.

[0019] The nozzle opening / closing valve includes a ball disposed in the communicating hole and an elastic component disposed in the nozzle to support the ball.

[0020] It also includes a piston cap located inside the cylinder and formed to cover the end of the piston, which is made of a stretchable material and can extend and retract as the piston moves forward and backward.

[0021] It also includes a cooling chamber that surrounds the outside of the electromagnetic coil on the outside of the body and is cooled by a cooling fluid absorbing the heat generated by the electromagnetic coil.

[0022] According to another aspect of the invention, a needleless syringe includes: a body formed in a hollow shape; an electromagnetic coil wound around the outer peripheral surface of the body; a cylinder connected in communication with the front of the opening of the body, having a drug receiving portion for receiving a drug and a nozzle portion for dispensing the drug received in the drug receiving portion forward; a movable magnetic body extending in the length direction and inserted into the interior of the body, which moves forward by magnetic force generated when current is applied to the electromagnetic coil; a piston configured to be inserted into the interior of the body and through the front of the movable magnetic body, moving forward by an impact force applied by the movable magnetic body when it moves forward, thereby pressurizing the drug in the drug receiving portion onto the nozzle portion; an elastic member for the movable magnetic body provided between the movable magnetic body and the piston, which applies an elastic force to the movable magnetic body in the direction of rearward movement of the movable magnetic body; and a communication hole configured to open and close the communication hole between the nozzle portion and the drug receiving portion, which is opened by hydraulic pressure applied from the drug in the drug receiving portion when the piston moves forward. The system includes: a nozzle opening / closing valve that elastically recovers during hydraulic pressure to close the connecting hole; a forward / backward drive member that repeatedly supplies and cuts off current to the electromagnetic coil at a preset cycle to repeatedly move the piston forward and backward; a piston cover located inside the cylinder and formed to cover the end of the piston, made of a stretchable material to extend and retract during the forward and backward movement of the piston; and a cooling chamber that surrounds the outside of the electromagnetic coil on the outside of the main body and is cooled by absorbing the heat generated by the electromagnetic coil with a cooling fluid. The forward / backward drive member includes: a current supply section that repeatedly supplies current to the electromagnetic coil to move the movable magnetic body forward when the piston moves forward and cuts off the current to the electromagnetic coil when the piston moves backward; a piston elastic member that applies an elastic force to the piston in the backward direction when the current supply section cuts off the current after applying current to the electromagnetic coil for a preset first set time, wherein the mass of the movable magnetic body is set to be 100g or less, and the first set time is 250ms or less.

[0023] Technical effect

[0024] The needleless syringe according to the present invention is configured to generate a magnetic field by supplying current to an electromagnetic coil to move a movable magnetic body and a piston forward. When the current to the electromagnetic coil is cut off, the movable magnetic body is moved backward by an elastic member, and the piston is moved backward by an elastic member, thereby enabling the piston for pressurized drug injection to move back and forth repeatedly, thus enabling high-speed and repeated injection of a predetermined drug.

[0025] Furthermore, by adjusting the duration of the current applied to the electromagnetic coil, the present invention minimizes the recoil force without the need for a separate recoil force cancellation structure, thereby simplifying the structure and improving ease of use.

[0026] Furthermore, the moving magnetic body impacts the piston, causing it to move forward, thus offering the advantage of injecting drugs at a higher speed with less energy.

[0027] Furthermore, it has the advantage of allowing multiple injections rather than a single treatment on a large area of ​​skin, such as the face, in fields such as skin rejuvenation.

[0028] Furthermore, it has the advantage of being able to automatically and repeatedly inject small amounts of medication at high speed without requiring additional loading by the user.

[0029] Furthermore, by changing the voltage applied to the electromagnetic coil and adjusting the length of the blocking device, the amount of drug injected at one time can be adjusted.

[0030] Furthermore, by setting up a cooling chamber around the electromagnetic coil, it is possible to prevent the magnetic force from weakening due to the heat generated in the electromagnetic coil.

[0031] Furthermore, the presence of a piston cap between the cylinder and the piston prevents medication from adhering to the piston end, thus eliminating the need for the user to wipe the piston end. Attached Figure Description

[0032] Figure 1 This is a schematic longitudinal section of a needleless syringe according to a first embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram showing the forward movement state of the piston of a needleless syringe according to a first embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram showing the backward movement state of the piston of a needleless syringe according to a first embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram illustrating the nozzle opening and closing valve of a needleless syringe according to a first embodiment of the present invention;

[0036] Figure 5 This is a graph illustrating an example of the current supply waveform applied to the electromagnetic coil of a needleless injector according to a first embodiment of the present invention.

[0037] Figure 6 This is a graph illustrating another example of the current supply waveform applied to the electromagnetic coil of a needleless injector according to a first embodiment of the present invention;

[0038] Figure 7It is a graph showing a comparison of different displacements corresponding to the time when current is applied to the electromagnetic coil in the needleless syringe according to the first embodiment of the present invention;

[0039] Figure 8 It is a graph showing the recoil force corresponding to the time when current is applied to the electromagnetic coil in the needleless injector according to the first embodiment of the present invention;

[0040] Figure 9 This is a longitudinal cross-sectional schematic diagram showing the configuration of a needleless syringe with a cooling chamber according to a second embodiment of the present invention;

[0041] Figure 10 This is a longitudinal cross-sectional schematic diagram showing the configuration of a needleless syringe with a piston cap according to a third embodiment of the present invention. Detailed Implementation

[0042] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0043] Figure 1 This is a schematic longitudinal section of a needleless syringe according to a first embodiment of the present invention.

[0044] See Figure 1 According to a first embodiment of the present invention, a needleless syringe 100 includes: a body 10, a cylinder 20, an electromagnetic coil 30, a movable magnetic body 90, an elastic member 110 for the movable magnetic body, a piston 40, a nozzle opening and closing valve 50, a forward and backward driving member (not shown), and a stopper 70.

[0045] The needleless syringe 100 is an impact syringe in which the movable magnetic body 90 moves forward by the magnetic force generated by the electromagnetic coil 30, and the movable magnetic body 90 impacts the piston 40 to move forward.

[0046] The body 10 is formed in a hollow shape and extends in the length direction. An opening is formed on the front of the body 10.

[0047] The cylinder 20 is screwed to the front of the body 10. The cylinder 20 is connected to the front of the opening of the body 10.

[0048] The cylinder 20 is hollow and has a main bore 21, a drug receiving part 22, and a nozzle part 23 connected in a continuous manner.

[0049] The main hole 21 of the cylinder is formed on the inner rear side of the cylinder 20, and at least a portion of it is threaded for screw engagement after the front end of the body 10 is inserted.

[0050] The cross-sectional area of ​​the drug-containing section 22 is smaller than that of the cylindrical main hole 21. The drug-containing section 22 is a channel for the piston 40 to move in close contact with the piston and is a storage space for containing drugs.

[0051] The drug receiving section 22 is formed in the shape of a diffusion nozzle, comprising a narrowing section 22a whose cross-sectional area gradually decreases forward and an enlarging section 22b extending from the narrowing section 22a and whose cross-sectional area increases again. The narrowing section 22a has a drug supply hole 22c for supplying drug from the outside through the pressure difference generated when the piston 40 moves backward. The drug filler 25 is attached to the drug supply hole 22c.

[0052] The nozzle portion 23 is connected to the drug receiving portion 22 and is configured with a gradually decreasing cross-sectional area to spray the drug contained in the drug receiving portion 22.

[0053] In this embodiment, the cylinder 20 is exemplified by combining a first piece having the main bore 21 and the drug receiving portion 22 with a second piece having the nozzle portion 23. However, it is not limited to this; of course, the first piece and the second piece can also be formed as a single unit.

[0054] The electromagnetic coil 30 is a coil wound around the front side of the outer periphery of the body 10 and is energized when the piston 40 moves forward.

[0055] When an electric current is applied to the electromagnetic coil 30, it generates a magnetic force in the direction of the forward movement of the movable magnetic body 90, thereby causing the movable magnetic body 90 to move forward.

[0056] The piston 40 extends in the length direction and is inserted into the interior of the body 10 and the cylinder 20, thereby squeezing out the drug contained in the drug receiving part 22.

[0057] The piston 40 is disposed independently of the movable magnet 90 inside the body 10 and is inserted in front of the movable magnet 90. When the movable magnet 90 moves forward, the piston 40 moves forward by the impact force applied by the movable magnet 90, so as to pressurize the drug in the drug receiving part 22 into the nozzle part 23.

[0058] The piston 40 has a first flange portion 41 protruding in the radial direction on the outer peripheral surface of the front part located inside the cylinder 20.

[0059] The first flange 41 gets stuck in the length adjustment stop 72 (described later) when the piston 40 moves forward, limiting the forward movement distance of the piston 40.

[0060] A second flange portion 42 protruding in the radial direction is formed on the outer peripheral surface of the piston 40 located at the rear part inside the body 10.

[0061] The stopper 70 is detachably attached between the cylinder 20 and the piston 40.

[0062] The blocker 70 includes a fixed blocker 71 that is fixed to the main hole 21 of the cylinder, and a length adjusting blocker 72 that is screwed to the inner circumferential surface of the fixed blocker 71 and is capable of adjusting the length of the fixed blocker 71.

[0063] The inner circumferential surface of the fixed stopper 71 is formed with a female thread, forming a ring shape.

[0064] The outer peripheral surface of the length adjusting stop 72 is formed with a male thread, forming a ring shape. A predetermined gap is formed between the length adjusting stop 72 and the piston 40, and the piston 40 can move forward and backward through the interior of the length adjusting stop 72.

[0065] The length adjusting stop 72 is screwed to the rear of the fixed stop 71, so the engagement length of the length adjusting stop 72 screw can be adjusted according to the amount of drug injected at one time.

[0066] The longer the engagement length of the length adjusting stop 72 screw with the fixed stop 71, the shorter the rearward protrusion of the length adjusting stop 72. If the rearward protrusion of the length adjusting stop 72 becomes shorter, the distance d between the length adjusting stop 72 and the first flange 41 becomes longer, and therefore the forward movement distance d of the piston 40 becomes longer. The longer the forward movement distance d of the piston 40, the greater the amount of drug injected at one time.

[0067] The shorter the engagement length of the length adjusting stop 72 screw with the fixed stop 71, the longer the length adjusting stop 72 protrudes rearward. The longer the rearward protrusion of the length adjusting stop 72, the shorter the distance d between the length adjusting stop 72 and the first flange 41, and therefore the shorter the forward movement distance d of the piston 40. The shorter the forward movement distance d of the piston 40, the smaller the amount of drug injected at one time.

[0068] Therefore, the user can finely adjust the amount of drug injected at one time by adjusting the length of the length adjusting blocker 72 combined with the fixed blocker 71.

[0069] The movable magnetic body 90 extends in the length direction and is inserted into the interior of the body 10, and moves forward and backward by the magnetic force generated when current is applied to the electromagnetic coil 30.

[0070] The movable magnetic body 90 is formed of a material that temporarily acquires magnetism when a current is applied to the electromagnetic coil 30, and whose magnetism disappears when the external magnetic field disappears, rather than a permanent magnet. The description will be based on an example where the movable magnetic body 90 is an iron core.

[0071] The elastic member 110 for the movable magnetic body is disposed inside the body 10, extending along the length of the body 10 between the movable magnetic body 90 and the piston 40. The elastic member 110 applies an elastic force to the movable magnetic body 90 in the direction of its rearward movement. The elastic member 110 is a first coil spring that is compressed when the movable magnetic body 90 moves forward and applies an elastic force to the movable magnetic body 90 in the direction of its rearward movement. One end of the elastic member 110 is attached to the rear end of the piston 40, and the other end can be attached to the front end of the movable magnetic body 90.

[0072] The nozzle opening / closing valve 50 is configured to open and close the communication hole between the nozzle section 23 and the drug receiving section 22. When the piston 40 moves forward, the hydraulic pressure applied to the drug in the drug receiving section 22 pushes the nozzle opening / closing valve 50 open to open the communication hole, and when the hydraulic pressure is released, it elastically returns to its original position to close the communication hole.

[0073] The nozzle opening / closing valve 50 includes a ball 51 disposed in the communicating hole and an elastic member 52 disposed in the nozzle 23, providing an elastic force that directs the ball toward the drug receiving portion 22. The ball 51 is configured to clamp into the enlarged portion 22b. In this embodiment, the nozzle opening / closing valve 50 is exemplified as a ball valve. However, it is not limited to this; the nozzle opening / closing valve 50 can also be a duckbill valve, a plate check valve, an electrically controlled valve, or other types of valves.

[0074] The forward and backward driving component then supplies and cuts off current to the electromagnetic coil 30 at a preset cycle, enabling the piston 40 to move forward and backward repeatedly.

[0075] The forward and backward drive component includes a current supply unit (not shown) and the piston elastic component 120.

[0076] The current supply unit (not shown) applies current to the electromagnetic coil 30 as the piston 40 moves forward, causing the movable magnetic body 90 to move forward. The current to the electromagnetic coil 30 is cut off when the piston 40 moves backward.

[0077] The current supply unit (not shown) may use either an energy storage device (not shown) that stores current supplied from an external power source or a DC power supply unit (not shown) that supplies current supplied from the external power source.

[0078] The energy storage device (not shown) supplies stored current to the electromagnetic coil 30 for discharge when the movable magnetic body 90 moves forward, and stores and stores electricity when the movable magnetic body 90 moves backward without supplying current to the electromagnetic coil 30. Therefore, the electrical energy applied when the movable magnetic body 90 moves forward is greater than the electrical energy applied when it moves backward, thus increasing the forward speed.

[0079] The piston elastic member 120 is an elastic member that applies an elastic force to the piston 40 in the direction of rearward movement when the current supply of the current supply unit is cut off.

[0080] The piston elastic component 120 includes a second coil spring 121 and a third coil spring 122 attached to the outer peripheral surface of the piston 40.

[0081] The second coil spring 121 is inserted into the piston 40 and its two ends are located between the cylinder 20 and the first flange 41. When the piston 40 moves forward, the second coil spring 121 is compressed by the first flange 41, and when the piston 40 moves backward, it applies an elastic force to the first flange 41 in the direction of the backward movement of the piston 40.

[0082] The third coil spring 122 is inserted into the piston 40 and its two ends are located between the body 10 and the second flange 42. The second coil spring 121 is compressed by the second flange 42 when the piston 40 moves forward, and applies an elastic force to the second flange 42 in the direction of the piston 40's backward movement when the piston 40 moves backward.

[0083] The operation of the needleless injector 100 according to the first embodiment of the present invention, as described above, is explained below.

[0084] Figure 2 This is a schematic diagram showing the forward movement state of the piston of a needleless syringe according to a first embodiment of the present invention. Figure 3 This is a schematic diagram showing the backward movement state of the piston of a needleless syringe according to a first embodiment of the present invention.

[0085] See Figure 2 When the piston 40 moves forward, a current in a preset first direction is applied to the electromagnetic coil 30. The first direction is defined as the direction in which a magnetic force is generated around the electromagnetic coil 30 in the direction of the piston 40's forward movement.

[0086] The movable magnetic body 90 moves forward by the magnetic force generated by the electromagnetic coil 30.

[0087] When the movable magnetic body 90 moves forward, the movable magnetic body is compressed by the elastic member 110.

[0088] When the movable magnetic body 90 moves forward a predetermined distance or more, the movable magnetic body 90 impacts the piston 40.

[0089] The piston 40 moves forward by the impact force applied during the impact of the movable magnetic body 90.

[0090] The impact force is proportional to the mass and moving speed of the movable magnetic body 90. The moving speed can be adjusted according to the voltage applied to the electromagnetic coil 30 and the moving distance of the movable magnetic body 90. By adjusting the voltage to change the impact force, the dosage of a single drug injection can be adjusted.

[0091] In this embodiment, because the piston 40 moves forward by impact force, it can move forward at a higher speed compared to the case where the piston 40 and the movable magnetic body 90 move forward together. Therefore, the electrical energy required for the forward movement of the piston 40 can be further reduced.

[0092] When the piston 40 moves forward, it compresses the piston elastic member 120. That is, when the piston 40 moves forward, it compresses the second coil spring 121 through the first flange 41 and the third coil spring 122 through the second flange 42.

[0093] The piston 40 can only move forward until the first flange 41 is blocked by the length adjustment stopper 72.

[0094] When the piston 40 moves forward, the piston 40 pressurizes the drug in the drug receiving section 22.

[0095] See Figure 4 In (a), when the drug in the drug containing the drug container 22 is pressurized, the nozzle opening / closing valve 50 is opened by hydraulic pressure.

[0096] When the nozzle opening / closing valve 50 is open, the drug in the drug receiving section 22 can be sprayed forward through the nozzle section 23.

[0097] As described above, when the piston 40 moves forward, it can only move forward until the first flange 41 is blocked by the length adjustment stopper 72, thus limiting the forward movement distance of the piston 40.

[0098] Therefore, by adjusting the engagement length of the length adjusting stop 72 with the fixed stop 71, the length protruding towards the rear of the first flange portion 41 can be adjusted, thereby adjusting the forward movement distance of the piston 40. Adjusting the forward movement distance of the piston 40 allows for adjustment of the amount of drug injected in a single injection.

[0099] That is, the amount of drug injected at one time can be adjusted according to the magnitude of the voltage applied to the electromagnetic coil 30 and the forward movement distance of the piston 40.

[0100] Then, the current supply unit supplies current to the electromagnetic coil 30 for a preset first set time Δt, and cuts off the current supply to the electromagnetic coil 30 after the first set time Δt has elapsed.

[0101] The first set time Δt is set to approximately 250 ms or less. The first set time Δt will be explained in detail later.

[0102] See Figure 3 When the piston 40 moves backward, it cuts off the current supply to the electromagnetic coil 30.

[0103] When the current to the electromagnetic coil 30 is cut off, the magnetic field caused by the electromagnetic coil 30 disappears, thereby eliminating the force that propels the movable magnetic body 90 forward.

[0104] The movable magnetic body 90 moves backward under the elastic restoring force of the elastic member 110. That is, the movable magnetic body 90 returns to its original position by the elastic force of the elastic member 110.

[0105] Furthermore, the piston 40 moves back to its original position by the elastic restoring force of the piston elastic member 120.

[0106] See Figure 4 In (b), when the piston 40 moves backward, the pressure inside the drug receiving section 22 decreases, and therefore the nozzle opening and closing valve 50 elastically recovers and closes.

[0107] Furthermore, when the pressure inside the drug receiving section 22 decreases, the drug can be filled into the drug receiving section 22 from the drug filler 25 through the drug supply hole 22c. That is, the piston 40 can automatically fill the drug when it moves backward.

[0108] Figure 8 This is a graph showing a comparison of different recoil forces corresponding to the time when current is applied to the electromagnetic coil in the needleless injector according to the first embodiment of the present invention.

[0109] In addition, the current supply unit supplies the electromagnetic coil 30 with a current for a preset first set time Δt, and then cuts off the current after the first set time Δt.

[0110] The first set time Δt is the time difference between the time point t1 when current is applied to the electromagnetic coil 30 and the time point t2 when current to the electromagnetic coil 30 is cut off.

[0111] The first set time Δt is set to the time that can mutually cancel out the first recoil impact I1 that occurs when the movable magnetic body 90 moves forward and the second recoil impact I2 that occurs when the movable magnetic body 90 impacts the piston 40.

[0112] When the movable magnetic body 90 moves forward, it generates a backward movement in the opposite direction to the forward movement of the needleless syringe 100 or the hand of the user holding the needleless syringe 100 through the action-reaction law.

[0113] When the movable magnetic body 90 impacts the piston 40, it generates a secondary recoil in the forward movement direction on the needleless syringe 100 or in the hand of the user holding the needleless syringe 100 through the action-reaction law.

[0114] See Figure 8 I1 represents the amount of the first recoil impact during the first recoil, and I2 represents the amount of the second recoil impact during the second recoil.

[0115] The primary recoil impact I1 caused by the first set time difference Δt is the same as the secondary recoil impact I2.

[0116] Therefore, by reducing the first set time Δt, the user experiences the primary recoil impact I1 and the secondary recoil impact I2 almost simultaneously, thus achieving the effect of counteracting the primary recoil impact I1 and the secondary recoil impact I2. That is, as... Figure 8 In (b), by reducing the first set time Δt, the optimal time to counteract the recoil force can be derived, thus achieving the effect of counteracting the recoil force.

[0117] Figure 7 It is a graph showing the displacement corresponding to the time when current is applied to the electromagnetic coil in the needleless injector according to the first embodiment of the present invention.

[0118] See Figure 7 In order to derive the optimal value of the first set time Δt, an experiment was conducted to measure the recoil distance while changing the first set time.

[0119] In the experiment, the first set time Δt was gradually decreased from 800 ms, and the moving distance of the movable magnetic body was fixed at 60 mm. The weight of the movable magnetic body was reduced as the first set time Δt decreased, while the impact force of the movable magnetic body 90 remained constant.

[0120] The recoil distance is the distance the needleless syringe travels during a single injection. A smaller recoil distance results in a smaller recoil impact felt by the user.

[0121] Increasing the voltage applied to the electromagnetic coil 30 increases the moving speed of the movable magnetic body 90, thereby reducing the first set time Δt.

[0122] Here, when the moving speed of the movable magnetic body 90 is increased, the impact applied to the piston 40 increases. Therefore, in order to keep the impact constant, the mass of the movable magnetic body 90 should be reduced accordingly based on the moving speed. The mass of the movable magnetic body 90 can be adjusted by adjusting its length or reducing its cross-sectional area. Rather than adjusting the length, it is preferable to adjust the mass by forming a hole inside.

[0123] In this experiment, the first set time Δt was reduced by increasing the voltage applied to the electromagnetic coil 30, and the experiment was conducted while reducing the mass of the movable magnetic body 90 in order to maintain the impact applied to the piston 40.

[0124] As can be seen from the experimental results, see [link / reference] Figure 7 When the first set time Δt is less than 250ms, there is almost no change in recoil displacement.

[0125] Therefore, the first set time Δt is less than 250ms, and the optimal weight of the active magnetic body 90 corresponding to the reduction of the first set time Δt is less than 100g.

[0126] By setting the duration of the current applied to the electromagnetic coil 30 to less than 250ms, the recoil felt by the user when using the needleless syringe 100 is counteracted, thereby improving ease of use.

[0127] As described above, the present invention can repeatedly move the piston 40 forward and backward by periodically supplying or cutting off current to the electromagnetic coil 30.

[0128] Furthermore, it can rapidly and repeatedly inject small amounts of medication, thus enabling the injection of small amounts of medication into the entire skin multiple times each time in fields such as cosmetic dermatology.

[0129] Furthermore, in this embodiment, the piston 40 moves forward by impact force, thus enabling it to move at a higher speed compared to the case where the piston 40 and the movable magnetic body 90 move forward together. Therefore, the electrical energy required for the forward movement of the piston 40 can be reduced.

[0130] Furthermore, by adjusting the time when current is applied to the electromagnetic coil 30, the recoil of the needleless syringe 100 can be minimized, thus eliminating the need for an additional recoil cancellation structure. Therefore, the structure is simple and the ease of use is improved.

[0131] also, Figure 5 This is a graph illustrating an example of the current supply waveform applied to the electromagnetic coil of a needleless injector according to a first embodiment of the present invention.

[0132] See Figure 5 The current supply unit (not shown) applies a voltage of approximately 100V for the first set time Δt to the electromagnetic coil 30 when the piston 40 moves forward, and cuts off the voltage to the electromagnetic coil 30 when the piston 40 moves backward.

[0133] An example will be described where the time for cutting off the voltage to the electromagnetic coil 30 is the same as the time for applying the voltage to the electromagnetic coil 30.

[0134] The amount of drug, etc., can be considered to differentiate the time or voltage applied to the electromagnetic coil 30.

[0135] also, Figure 6 This is a graph illustrating another example of the current supply waveform applied to the electromagnetic coil of a needleless injector according to a first embodiment of the invention.

[0136] See Figure 6 The current supply unit (not shown) can periodically change the direction of the magnetic force generated in the electromagnetic coil 30 by repeatedly changing the direction of the current applied to the electromagnetic coil 30 at a preset period.

[0137] An example will be described in which the current supply unit (not shown) applies a voltage of approximately 100V for the first set time Δt to the electromagnetic coil 30 when the movable magnetic body 90 moves forward, and applies a voltage of approximately -100V for the first set time Δt to the electromagnetic coil 30 when the movable magnetic body 90 moves backward.

[0138] Therefore, when a voltage of 100V is applied to the electromagnetic coil 30, a magnetic force is generated in the direction of the forward movement of the movable magnetic body 90, thereby enabling the movable magnetic body 90 to move forward.

[0139] Furthermore, when a voltage of -100V is applied to the electromagnetic coil 30, a magnetic force is generated in the direction of the backward movement of the movable magnetic body 90, thereby enabling the movable magnetic body 90 to move backward.

[0140] Furthermore, not limited to this, the current supply unit (not shown) may also be configured to include an energy storage device (not shown) that stores current supplied from an external power source, supplies the stored current to the electromagnetic coil 30 when the piston 40 moves forward, and cuts off the current supply to the electromagnetic coil 30 when the piston 40 moves backward, and a DC power supply unit that supplies current supplied from the external power source to the electromagnetic coil 30 when the piston 40 moves backward.

[0141] That is, the current supply unit (not shown) repeatedly changes the direction of the current applied to the electromagnetic coil 30 according to a preset cycle, and supplies the current stored in the energy storage device (not shown) when the piston 40 moves forward, and supplies the current from the DC power supply unit when the piston 40 moves backward, thereby greatly increasing the moving speed of the piston 40 when it moves forward.

[0142] Figure 9 This is a longitudinal cross-sectional schematic diagram showing the structure of a needleless syringe with a cooling chamber according to a second embodiment of the present invention.

[0143] See Figure 9 The needleless syringe 200 according to the second embodiment of the present invention also includes a cooling chamber 210 for cooling the heat generated in the electromagnetic coil 30 by a cooling fluid, which is different from the first embodiment. The remaining configuration and function are similar to the first embodiment, so the description of similar configurations is omitted below and the description focuses on the different configurations.

[0144] The cooling chamber 210 is detachably attached to the outside of the body 10.

[0145] The cooling chamber 210 is configured to surround the electromagnetic coil 30 on the outer peripheral surface of the body 10. The cooling chamber 210 is combined with a cooling fluid supply pipe 211 and a cooling fluid discharge pipe 212.

[0146] The cooling fluid supply pipe 211 is a flow path for supplying cooling fluid from the outside to the cooling chamber 210. The cooling fluid discharge pipe 212 is a flow path for discharging the cooling fluid from the cooling chamber 210 to the outside. On / off valves (not shown) may be provided on the cooling fluid supply pipe 211 and the cooling fluid discharge pipe 212 respectively.

[0147] Furthermore, in this embodiment, a cooling fluid is used to cool the electromagnetic coil 30, and water or air is used as an example of the cooling fluid, but it is not limited to this. Of course, conductive cooling methods can also be used.

[0148] The needleless syringe 200 according to the second embodiment of the present invention configured as described above can absorb the heat of the electromagnetic coil 30 by having a cooling chamber 210 for cooling the electromagnetic coil 30 to maintain it at a certain temperature, thereby preventing the heat generated by the electromagnetic coil 30 from causing a decrease in magnetic force.

[0149] Figure 10 This is a longitudinal cross-sectional schematic diagram showing the structure of a needleless syringe with a piston cap according to a third embodiment of the present invention.

[0150] See Figure 10 The needleless syringe 300 according to the third embodiment of the present invention has a piston cap 310 located between the cylinder 20 and the piston 40, which is different from the first and second embodiments. The remaining configuration and function are similar to those of the above embodiments, so only the different configurations are described.

[0151] The piston cap 310 can be applied in both the first and second embodiments.

[0152] The piston cap 310 is fixedly disposed on the cylinder 20. The piston cap 310 is located inside the cylinder 20 and is configured to cover the end of the piston 40. The piston cap 310 can also be inserted into the inside of the cylinder 20, or it can be fixed to the inner circumferential surface of the cylinder 20 by means of adhesive or bonding.

[0153] The piston cover 310 is formed of a stretchable material that extends forward through the piston 40 when the piston 40 moves forward and returns to its original position when the piston 40 moves backward. In this embodiment, the piston cover 310 is described using a rubber membrane as an example.

[0154] The piston cap 310 prevents the drug from directly adhering to the end of the piston 40.

[0155] Therefore, the user does not need to wipe the end of the piston 40.

[0156] Furthermore, since the piston cover 310 is located on the cylinder 20, the piston cover 310 can be replaced simultaneously when the cylinder 20 is replaced.

[0157] The present invention has been described with reference to the embodiments shown in the accompanying drawings, but these are merely illustrative, and those skilled in the art will understand that various modifications and equivalent embodiments can be made therefrom. Therefore, the true scope of protection of the present invention depends on the technical concept outlined in the appended claims.

[0158] Industry availability

[0159] The advantage of the present invention is that it is a needleless syringe capable of rapidly and repeatedly injecting a predetermined drug.

Claims

1. A needleless injector comprising: a body; an electromagnetic coil wound around an outer circumference of the body; a front face of an opening communicatively coupled to the body, a cylinder formed with a drug receiving portion for receiving a drug and a nozzle portion for ejecting the drug received in the drug receiving portion in a forward direction; a movable magnetic body inserted in an inside of the body in a lengthwise direction and advanced by a magnetic force generated when a current is applied to the electromagnetic coil; a piston provided to be inserted in the inside of the body in front of the movable magnetic body, to pass through the body and the cylinder, and to be advanced by an impact force applied by the movable magnetic body when the movable magnetic body is advanced, to pressurize the drug in the drug receiving portion toward the nozzle portion; a nozzle opening and closing valve provided to open and close a communication hole between the nozzle portion and the drug receiving portion; and a forward and backward driving member that repeats an advancing movement and a retreating movement of the piston by repeatedly supplying and cutting off a current to the electromagnetic coil at a predetermined cycle, the forward and backward driving member comprising: a current supply portion that repeats a process of supplying a current to the electromagnetic coil to advance the movable magnetic body when the piston is advanced and cutting off the current to the electromagnetic coil when the piston is retreated, the current supply portion applying a current to the electromagnetic coil for a predetermined first set time and then cutting off the current, the mass of the movable magnetic body being set to be 100 g or less and the first set time being set to be 250 ms or less. further comprising:

2. The needle-free injector of claim 1, wherein, a movable magnetic body elastic member provided between the movable magnetic body and the piston and applying an elastic force to the movable magnetic body in a direction in which the movable magnetic body retreats; the movable magnetic body elastic member including a first coil spring that is compressed when the movable magnetic body is advanced and applies an elastic force to the movable magnetic body in a direction in which the movable magnetic body retreats.

3. The needleless injector according to claim 1, wherein: the forward and backward driving member further comprises: a piston elastic member that applies an elastic force to the piston in a direction in which the piston retreats when the current supply of the current supply portion is cut off; the piston is formed with a first flange portion that protrudes in a radial direction from an outer circumference of a front portion located in the inside of the cylinder, the piston elastic member includes a second coil spring that is inserted outside the piston, both ends of which are located between the cylinder and the first flange portion, is compressed when the piston is advanced, and applies an elastic force to the first flange portion in a direction in which the piston retreats.

4. The needleless injector according to claim 1, wherein: the forward and backward driving member further comprises: a piston elastic member that applies an elastic force to the piston in a direction in which the piston retreats when the current supply of the current supply portion is cut off; the piston is formed with a second flange portion that protrudes in a radial direction from an outer circumference of a rear portion located in the inside of the body, ​ The elastic member for the piston includes a second coil spring that is externally inserted in the piston, both ends of which are positioned between the cylinder and the first flange portion, is compressed when the piston moves forward, and exerts an elastic force on the first flange portion in the direction in which the piston moves backward.

5. The needle-free injector of claim 1, wherein: The forward and backward driving member further includes: An elastic member for the piston that exerts an elastic force on the piston in the direction in which the piston moves backward when the supply of the electric current to the electric current supply portion is cut off; The piston is formed with a first flange portion that protrudes in the radial direction from the outer circumferential surface of the front portion positioned inside the cylinder and a second flange portion that protrudes in the radial direction from the outer circumferential surface of the rear portion positioned inside the body, The elastic member for the piston includes a second coil spring that is externally inserted in the piston, both ends of which are positioned between the cylinder and the first flange portion, is compressed when the piston moves forward, and exerts an elastic force on the first flange portion in the direction in which the piston moves backward; and a third coil spring that is externally inserted in the piston, both ends of which are positioned between the body and the second flange portion, is compressed when the piston moves forward, and exerts an elastic force on the second flange portion in the direction in which the piston moves backward.

6. The needle-free injector of claim 3, wherein, Further includes: A stopper that is positioned between the piston and the cylinder, and in which the first flange portion is caught to limit the distance of forward movement of the piston when the piston moves forward.

7. The needle-free injector of claim 6, wherein, The stopper includes: A fixed stopper that is fixedly provided to the inner circumferential surface of the cylinder, has an annular shape, and has a female screw formed on the inner circumferential surface; and A length-adjustable stopper that is screw-coupled to the inner circumferential surface of the fixed stopper, is formed to catch the first flange portion when the piston moves forward, and is capable of adjusting the coupling length of the screw-coupled fixed stopper.

8. The needle-free injector of claim 1, wherein: The medicine accommodation portion is formed in a diffusion nozzle shape including a reduced portion in which the cross-sectional area decreases toward the front, and an enlarged portion that is extended from the reduced portion and in which the cross-sectional area increases again, The reduced portion is formed with a medicine supply hole that receives medicine from the outside by a pressure difference generated when the piston moves backward.

9. The needle-free injector of claim 8, wherein: The nozzle portion opening and closing valve is pushed away by hydraulic pressure applied by the medicine from the medicine accommodation portion to open the communication hole when the piston moves forward, and elastically returns to close the communication hole when the hydraulic pressure is removed; The nozzle portion opening and closing valve includes a ball provided at the communication hole, and an elastic member provided at the nozzle portion to support the ball.

10. The needle-free injector of claim 1, wherein, Further includes: A piston cover that is positioned inside the cylinder and is formed to shield the end portion of the piston, is formed of a stretchable material to be stretchable when the piston moves forward and backward.

11. The needle-free injector of claim 1, wherein, Further includes: A cooling chamber that is provided outside the body to surround the electromagnetic coil, and cools by absorbing heat generated in the electromagnetic coil through a cooling fluid.

12. A needle-free injector, comprising: A body; An electromagnetic coil that is wound around the outer circumferential surface of the body; An elastic member for the piston that exerts an elastic force on the piston in the direction in which the piston moves backward when the supply of the electric current to the electric current supply portion is cut off; a front face of an opening communicatively coupled to the body, the front face formed with a medicine accommodation portion for accommodating medicine and a nozzle portion for ejecting the medicine accommodated in the medicine accommodation portion in a forward direction; a movable magnetic body inserted into the inside of the body in a length direction and advanced by a magnetic force generated when a current is applied to the electromagnetic coil; a piston provided to pass through the body and the cylinder in front of the movable magnetic body inserted into the inside of the body, the piston advanced by the movable magnetic body and an impact force caused thereby when the movable magnetic body is advanced, the piston pressurizing the medicine in the medicine accommodation portion toward the nozzle portion during the advancement of the piston; a nozzle portion opening and closing valve provided to open and close a communication hole between the nozzle portion and the medicine accommodation portion; and a forward and backward driving member that repeats the advancement and the backward movement of the piston by repeatedly supplying and cutting off a current to the electromagnetic coil at a predetermined cycle, the forward and backward driving member including: a current supply portion that repeats a process of supplying a current to the electromagnetic coil to advance the movable magnetic body when the piston is advanced and cutting off the current to the electromagnetic coil when the piston is moved backward, the current supply portion applying a current to the electromagnetic coil for a predetermined first set time and then cutting off the current, the movable magnetic body being set to have a mass of 100 g or less and the first set time being set to 250 ms or less.

13. A needleless injector comprising: a body; an electromagnetic coil wound around an outer circumferential surface of the body; a front face of an opening communicatively coupled to the body, the front face formed with a medicine accommodation portion for accommodating medicine and a nozzle portion for ejecting the medicine accommodated in the medicine accommodation portion in a forward direction; a movable magnetic body inserted into the inside of the body in a length direction and advanced by a magnetic force generated when a current is applied to the electromagnetic coil; a piston provided to pass through the body and the cylinder in front of the movable magnetic body inserted into the inside of the body, the piston advanced by the movable magnetic body and an impact force caused thereby when the movable magnetic body is advanced, the piston pressurizing the medicine in the medicine accommodation portion toward the nozzle portion during the advancement of the piston; a nozzle portion opening and closing valve provided to open and close a communication hole between the nozzle portion and the medicine accommodation portion; and a forward and backward driving member that repeats the advancement and the backward movement of the piston by repeatedly supplying and cutting off a current to the electromagnetic coil at a predetermined cycle, the forward and backward driving member including: a current supply portion that repeats a process of supplying a current to the electromagnetic coil to advance the movable magnetic body when the piston is advanced and cutting off the current to the electromagnetic coil when the piston is moved backward, the current supply portion applying a current to the electromagnetic coil for a predetermined first set time and then cutting off the current, the movable magnetic body being set to have a mass of 100 g or less and the first set time being set to 250 ms or less. ​

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