Needleless syringe

Abstract

To provide a needleless syringe capable of rapidly and repeatedly injecting a drug.SOLUTION: A needleless syringe according to the present invention is configured to move a movable magnetic body and a piston forward by a magnetic field generated by current supplied to a solenoid coil and, when current is blocked to the solenoid coil, allow an elastic member for the movable magnetic body to move the movable magnetic body backward and allow an elastic member for a piston to move the piston backward so that the piston for pressurizing and injecting a drug can repeatedly and reciprocally move forward or backward. Thereby rapid and repeated injection of a predetermined drug is possible. Moreover, the present invention minimizes, through controlling of a time of applying current to the solenoid coil, recoil without need to add a separate recoil offset structure thereto, and thus can improve convenience in use while having a simple structure.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a needleless injector, and more particularly to a needleless injector that can inject drugs repeatedly at high speed. The present invention relates to a needleless syringe that can inject [Background technology]

[0002] Generally, a syringe is an instrument that injects a liquid medicine into the tissue of a living organism. The needle that pricks the syringe and the syringe that contains the liquid medicine move back and forth inside the syringe. It consists of a piston that pushes the medicine into the needle. The needle has a hole, and when you inject the medicine Inject something.

[0003] Recently, needleless syringes have been developed to eliminate fear of needles and prevent needle-related infections. Research and development into launchers is becoming more active.

[0004] However, conventional needleless injectors are designed to inject a predetermined amount of drug into only one spot on the skin at a time. Because of this, there is a risk of damage to skin tissue. In addition, since there is the inconvenience of having to refill after one injection, it is not suitable for use on large areas in the field of skin beauty. There is a limitation in that it cannot be used to inject drugs uniformly into the skin multiple times. Summary of the Invention [Problem to be solved by the invention]

[0005] The object of the present invention is to inject small amounts of drug repeatedly at high speed to uniformly inject the drug into a larger area of ​​skin. The present invention aims to provide a needleless syringe capable of injecting a drug. [Means for solving the problem]

[0006] The needleless syringe according to the present invention comprises a hollow body; a solenoid coil connected to the open front surface of the body so as to be in communication with the A drug storage section in which an object is stored, and a nozzle that ejects the drug stored in the drug storage section to the front. a cylinder formed with a portion; a cylinder inserted into the body in the longitudinal direction, A moving magnetic body that moves forward due to the magnetic force generated when a current is applied to a magnetoid coil; The body and the cylinder are inserted in front of the moving magnetic body. When the moving magnetic body moves forward, the moving magnetic body applies A piston that moves forward by impact force and pressurizes the drug in the drug storage portion into the nozzle portion. a spring provided between the moving magnetic body and the piston, which moves the moving magnetic body backward; an elastic member for the moving magnetic body that applies elastic force to the moving magnetic body in the direction of the nozzle portion; The piston is provided to open and close a communication hole between the piston and the container. The communicating hole is pushed by the hydraulic pressure applied by the drug from the drug storage portion. A nozzle opening / closing valve that opens and elastically restores its original shape when the hydraulic pressure is released to close the communication hole. The piston is driven by repeatedly supplying and cutting off current to the solenoid coil at a predetermined cycle. and a forward and backward driving means for repeatedly moving the pin forward and backward. When the stone moves forward, a current is supplied to the solenoid coil to move the moving magnetic body forward. and when the piston moves backward, the current to the solenoid coil is cut off. A repeating current supply unit; a direction in which the piston retracts when the current supply unit cuts off a piston elastic member for applying an elastic force to the piston;

[0007] The current supply unit applies a current to the solenoid coil for a first predetermined time. , the current is interrupted, the mass of the moving magnetic body is 100 g or less, and the first set time is: Set to 250ms or less.

[0008] The elastic member for the moving magnetic body is compressed when the moving magnetic body moves forward, The first coil spring applies elastic force to the moving magnetic body in the direction in which the moving magnetic body moves backward. The piston protrudes radially from the outer circumferential surface of the front part located inside the cylinder. The piston elastic member is fitted onto the piston, and both flange portions are formed. an end provided between the cylinder and the first flange portion for forward movement of the piston; When the piston is compressed, it applies an elastic force to the first flange portion in the direction in which the piston moves backward. The second coil spring is included. The piston is a piston that protrudes radially from the outer circumferential surface of the rear side portion located inside the body. A second flange portion is formed, and the piston elastic member is fitted onto the piston, and both ends is provided between the body and the second flange portion, and when the piston moves forward, and a second flange portion that is compressed and applies an elastic force to the second flange portion in a direction in which the piston moves backward. Includes 3 coil springs.

[0009] The piston protrudes radially from the outer circumferential surface of the front part located inside the cylinder. a first flange portion projecting radially from the outer peripheral surface of the rear side portion located inside the body; and a second flange portion formed thereon, and the piston elastic member is fitted onto the piston. and both ends are provided between the cylinder and the first flange portion, and When the piston moves forward, it is compressed, and an elastic force is applied to the first flange portion in the direction in which the piston moves backward. a second coil spring that is inserted around the piston and has both ends connected to the body and the second flange; The piston is compressed when it moves forward and the piston moves backward. and a third coil spring that applies an elastic force to the second flange portion in the retracting direction. A spring is provided between the piston and the cylinder, and when the piston moves forward, The first flange portion is caught by a blocker that limits the forward movement distance of the piston. This includes:

[0010] A ring-shaped fixed block having a female screw thread formed on the inner peripheral surface of the cylinder is fixed to the inner peripheral surface of the cylinder. and the fixed blocker is threadedly engaged with the inner peripheral surface of the fixed blocker, and when the piston moves forward, the The first flange portion is formed to be hooked, and the coupling length to be screwed into the fixed blocker is and an adjustable length adjustment blocker. The drug storage section has a narrowed section whose cross-sectional area decreases toward the front, and a narrowed section whose cross-sectional area decreases toward the front. The area of ​​the nozzle is increased again by a widening portion, and the narrowing portion has the pin Drug supply hole that supplies drugs from the outside by the pressure difference that occurs when the stone moves backward is formed.

[0011] The nozzle opening / closing valve is provided with a ball provided in the communication hole and a valve provided in the nozzle. and an elastic member supporting the ball. The piston is provided in the cylinder and is formed to cover the end of the piston. The piston is made of an expandable material so that it can expand and contract when moving forward and backward. It further includes a cover. A solenoid coil is provided outside the body so as to surround the solenoid coil. a cooling chamber that absorbs and cools the heat generated by the magnetron coil through a cooling fluid; Included.

[0012] According to another aspect of the present invention, a needleless syringe includes a hollow body; A solenoid coil wound around the periphery; connected to the open front of the body so as to communicate with the body. The drug storage section is a section that stores a drug, and the drug stored in the drug storage section is discharged to the front. a cylinder formed with a nozzle portion from which the nozzle is ejected; A moving magnetic body moves forward due to the magnetic force generated when a current is applied to the solenoid coil. ; inserted inside the body in front of the moving magnetic body, When the moving magnetic body moves forward, the moving magnetic body The impact force applied by the body causes the drug in the drug storage section to be moved forward, and the drug is pressed against the nozzle section. a piston; a piston provided between the moving magnetic body and the piston, the moving magnetic body being an elastic member for the moving magnetic body that applies an elastic force to the moving magnetic body in the direction of retraction; a communicating hole between the piston and the drug storage portion, During the forward movement, the connecting portion is pushed by the hydraulic pressure applied by the drug from the drug storage portion. When the hydraulic pressure is released, the nozzle is elastically restored to close the communication hole. The solenoid coil is repeatedly supplied with and cut off current at a predetermined cycle, and the A forward and backward driving means for repeating the forward and backward movement of the piston; The piston is formed to cover the end of the piston, and when the piston moves forward or backward, a piston cover formed of a stretchable material so as to be stretchable; The solenoid coil is provided with a coil that surrounds the outside of the solenoid coil. a cooling chamber that absorbs generated heat through a cooling fluid and cools the device; The means supplies a current to the solenoid coil when the piston moves forward, thereby The moving magnetic body is moved forward, and when the piston moves backward, a current is applied to the solenoid coil. a current supply unit that repeatedly cuts off the current; and a current supply unit that cuts off the current supply to the piston. a piston elastic member that applies an elastic force in a direction in which the piston retracts; A current is applied to the solenoid coil for a first predetermined time, and then the current is cut off. The mass of the moving magnetic body is set to 100 g or less, and the first set time is set to 250 ms or less. will be done. [Effects of the Invention]

[0013] The needleless syringe of the present invention supplies a current to a solenoid coil to generate a magnetic field, which controls the movement. When the magnetic body and piston are moved forward and the current to the solenoid coil is cut off, the moving magnetic body The elastic member for the piston moves the moving magnetic body backward, and the elastic member for the piston moves the piston backward. By configuring the syringe so that the piston that pressurizes and injects the drug is repeatedly advanced and The syringe is configured to reciprocate, thereby allowing rapid and repeated injection of a given drug. It is possible.

[0014] In addition, the present invention adjusts the time during which current is applied to the solenoid coil to provide separate recoil cancellation. By minimizing recoil without the need for additional structure, the structure is simple yet This can improve the convenience of use.

[0015] In addition, the moving magnetic body collides with the piston, causing the piston to move forward, The advantage is that the drug can be injected at a higher speed using less energy. In addition, in the field of skin beauty, when treating a wider area of ​​skin such as the face, multiple treatments can be performed instead of just one. It has the advantage that it can be injected multiple times. In addition, it allows for automatic repeated injection of small amounts of medicine at high speed without the need for the user to load the medicine separately. This has the advantage of being

[0016] Also, by changing the voltage applied to the solenoid coil and the coupling length of the length-adjusting blocker, The amount of drug injected at one time can be adjusted. In addition, by providing a cooling chamber around the solenoid coil, This can prevent the magnetic force from being weakened by the heat generated from the magnetic field. In addition, a piston cover is provided between the cylinder and the piston, so that the drug is prevented from being injected into the piston. This prevents the oil from getting on the end of the piston, eliminating the need for the user to wipe the end of the piston. This has the advantage that [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a longitudinal cross-sectional view showing a needle-free syringe according to a first embodiment of the present invention. [Figure 2] 4 is a view showing a state in which a piston of the needle-free syringe according to the first embodiment of the present invention moves forward. [Figure 3] 4 is a view showing a retracted state of the piston of the needle-free syringe according to the first embodiment of the present invention. [Figure 4] 1 is a view showing a nozzle opening / closing valve of a needleless syringe according to a first embodiment of the present invention. [Figure 5] 4 is a graph showing an example of a current supply waveform applied to a solenoid coil of the needle-free syringe according to the first embodiment of the present invention. [Figure 6] 5 is a graph showing another example of a current supply waveform applied to the solenoid coil of the needle-free syringe according to the first embodiment of the present invention. [Figure 7] 4 is a graph showing a comparison of recoil forces depending on the time during which a current is applied to a solenoid coil in the needle-free syringe according to the first embodiment of the present invention. [Figure 8] 4 is a graph showing displacement as a function of time during which current is applied to a solenoid coil in the needle-free syringe according to the first embodiment of the present invention. [Figure 9] FIG. 10 is a longitudinal cross-sectional view showing a configuration in which a cooling chamber is provided in a needle-free syringe according to a second embodiment of the present invention. [Figure 10] FIG. 10 is a longitudinal cross-sectional view showing a configuration in which a needle-free syringe according to a third embodiment of the present invention is provided with a piston cover. DETAILED DESCRIPTION OF THE INVENTION

[0018] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a needle-free syringe according to a first embodiment of the present invention.

[0019] Referring to FIG. 1, a needleless syringe 100 according to a first embodiment of the present invention comprises a body 10, a syringe 11, a syringe 12, a syringe 13, a syringe 14, a syringe 15, a syringe 16, a syringe 17, a syringe 18, a syringe 19, a syringe 20, a syringe 21, a syringe 22, a syringe 23, a syringe 24, a syringe 25, a syringe 26, cylinder 20, solenoid coil 30, moving magnetic body 90, elastic member 110 for moving magnetic body, It includes a piston 40, a nozzle opening / closing valve 50, a forward / backward driving means 60, and a blocker 70. The needle-free syringe 100 is driven by the magnetic force generated by the solenoid coil 30. When the moving magnetic body 90 moves forward, the moving magnetic body 90 collides with the piston 40 and moves forward. This is an impact type syringe that moves the piston 40 forward. The body 10 is hollow and elongated in the longitudinal direction. The front surface of the substrate is formed to be open.

[0020] The cylinder 20 is screwed to the front side of the body 10. The cylinder 20 is The body 10 is connected to the open front surface thereof so as to be in communication with the body 10 . The cylinder 20 is hollow and has a cylinder main hole 21, a drug storage portion 2 2 and the nozzle portion 23 are formed so as to be in communication with each other.

[0021] The cylinder main hole 21 is formed at the rear side of the inside of the cylinder 20. A screw thread is formed on both parts so that the front end of the body 10 can be inserted and screwed into them. The drug storage portion 22 is shaped to have a smaller cross-sectional area than the body connection hole 21. The drug storage portion 22 is a passage through which the piston 40 moves in close contact with the drug storage portion 22. This is the storage space where the drug is stored.

[0022] The drug storage section 22 has a tapered section 22a whose cross-sectional area gradually decreases toward the front, and the tapered section 22b. The nozzle is formed in a divergent nozzle shape including an enlarged portion 22b extending from the small portion 22a and having an increased cross-sectional area. The reduction portion 22a is filled with a pressure difference generated when the piston 40 moves backward. A drug supply hole 22c is formed to supply a drug from the outside. A drug loading device 25 is connected to c.

[0023] The nozzle portion 23 is connected to the drug storage portion 22 and has a cross-sectional area that gradually decreases. The drug contained in the drug containing portion 22 is sprayed.

[0024] In this embodiment, the cylinder 20 has the body coupling hole 21 and the drug receiving portion. a first block in which the nozzle portion 22 is formed, and a second block in which the nozzle portion 23 is formed. However, it is not limited to this, and the first block and the second block may be bonded to each other. The second block may be integrally formed. The solenoid coil 30 is wound around the front side of the outer circumferential surface of the body 10. This is a coil to which a current is applied when the actuator 40 moves forward.

[0025] When a current is applied to the solenoid coil 30, the moving magnetic body 90 moves forward in the direction of the solenoid coil 30. It generates a magnetic force to move the moving magnetic body 90 forward. The piston 40 is arranged inside the body 10 and the cylinder 20 and extends in the longitudinal direction. It is inserted and serves to push out the drug contained in the drug containing portion 22. The piston 40 is provided separately from the motion magnetic body 90 inside the body 10, The piston 40 is inserted in front of the moving magnetic body 90. During the forward movement of the drug-collecting agent, the drug-collecting agent moves forward due to the impact force applied by the moving magnetic body 90. The drug in the container portion 22 is pressurized into the nozzle portion 23 . The piston 40 has a front outer circumferential surface located inside the cylinder 20, and is provided with a groove 21 extending radially outward. A first flange portion 41 is formed so as to protrude outward.

[0026] The first flange portion 41 is configured to be in contact with a length adjusting blocker (described later) when the piston 40 moves forward. -7, limiting the forward movement distance of the piston 40. The piston 40 has a rear outer peripheral surface located inside the body 10, and is provided with a groove extending radially therefrom. A protruding second flange portion 42 is formed. The blocker 70 is detachably coupled between the cylinder 20 and the piston 40. will be done.

[0027] The blocker 70 is a fixed block connected to the cylinder main hole 21. The locker 71 is screwed to the inner peripheral surface of the fixed blocker 71. and a length adjustment blocker 72 that is adjustable in length and coupled to the

[0028] The fixed blocker 71 is formed in a ring shape with a female screw thread formed on the inner circumferential surface. The length adjustment blocker 72 is formed in a ring shape with a male screw thread formed on the outer circumferential surface. A predetermined gap is formed between the length adjusting blocker 72 and the piston 40, The piston 40 moves forward and backward through the length adjusting blocker 72. .

[0029] The length adjustment blocker 72 is screwed onto the rear side of the fixed blocker 72, The length of the blocker 72 is adjusted depending on the amount of drug injected. It is possible.

[0030] The longer the coupling length of the length-adjusting blocker 72 screwed to the fixed blocker 71, the In this way, the length of the length adjusting blocker 72 protruding rearward is shortened. When the length of the car 72 protruding rearward is shortened, the length adjusting blocker 72 and the first frame Since the distance (d) between the piston 40 and the lunge portion 41 is longer, the forward movement distance (d) of the piston 40 is The longer the forward movement distance (d) of the piston 40, the greater the amount of medicine injected at one time. do.

[0031] The shorter the coupling length of the length-adjusting blocker 72 screwed to the fixed blocker 71, the In this case, the length of the length adjusting blocker 72 protruding rearward becomes longer. The longer the length of the car 72 that protrudes rearward, the closer the length of the length adjusting blocker 72 and the first Since the distance (d) between the flange portion 41 and the piston 40 is shortened, the forward movement distance (d) of the piston 40 is The shorter the forward movement distance (d) of the piston 40, the smaller the amount of drug injected at one time. do.

[0032] Therefore, the user can adjust the length of the length-adjusting blocker 72 by adjusting the length of the length-adjusting blocker 72. By adjusting the length of the injection, the amount of drug injected at one time can be finely adjusted. The moving magnetic body 90 is inserted into the body 10 in the longitudinal direction. When a current is applied to the id coil 30, a magnetic force is generated, causing it to move back and forth.

[0033] The moving magnetic body 90 is not a permanent magnet, but generates a magnetic field when a current is applied to the solenoid coil 30. It is made of a material that becomes temporarily magnetic due to the external magnetic field and loses its magnetism when the external magnetic field disappears. The moving magnetic body 90 is described as an iron core.

[0034] The elastic member 110 for the moving magnetic body is in front of the moving magnetic body 90 inside the body 10. The moving magnetic body 10 is provided between the piston 40 and the moving magnetic body 10 in the longitudinal direction. The elastic member 110 is attached to the moving magnetic body 110 in the direction in which the moving magnetic body 90 moves backward. The elastic member 110 for the moving magnetic body applies an elastic force to the moving magnetic body 90. When the moving magnetic body 90 is compressed, an elastic force is applied to the moving magnetic body 90 in the direction in which the moving magnetic body 90 moves backward. One end of the elastic member 110 for the moving magnetic body is the first coil spring. The other end may be connected to the front end of the moving magnetic body 90 .

[0035] The nozzle part opening / closing valve 50 is a communication hole between the nozzle part 23 and the drug storage part 22. The nozzle opening / closing valve 50 is provided to open and close the nozzle when the piston 40 moves forward. At this time, the drug is pushed by the hydraulic pressure applied by the drug contained in the drug containing section 22, The connecting hole is opened, and when the hydraulic pressure is released, the connecting hole is closed by being elastically restored. do.

[0036] The nozzle portion opening / closing valve 50 has a ball 51 provided in the communication hole and a nozzle portion 2 3, and the ball provides an elastic force in a direction toward the drug storage portion 22. The ball 51 is formed to be inserted into the enlarged portion 22b. In this embodiment, the nozzle opening / closing valve 50 is described as a ball valve. However, the nozzle opening / closing valve 50 is not limited to this, and may be a duckbill. ) valves, plate check valves, electric control valves and various other valves can be used. The forward / backward driving means repeatedly supplies and cuts off current to the solenoid coil 30 at a predetermined cycle. In this way, the piston 40 can be repeatedly moved forward and backward a number of times. The advancing / retreating drive means includes a current supply unit (not shown) and the elastic member 120 for the piston. .

[0037] The current supply unit (not shown) supplies the solenoid coil with current when the piston 40 moves forward. Applying a current to the coil 30 causes the moving magnetic body 90 to move forward. When the actuator is retracted, the current to the solenoid coil 30 is cut off.

[0038] The current supply unit (not shown) is a capacitor ( a DC power supply unit (not shown) for supplying current from the external power supply source; Either one of the above may be used.

[0039] The capacitor (not shown) transfers the stored current to the storage capacitor when the moving magnetic body 90 moves forward. When the moving magnetic body 90 moves backward, the solenoid coil 30 is supplied with a current to discharge the magnetic body 90. The electric current is not supplied to the coil 30, but is stored and stored. The electrical energy applied during forward movement is greater than the electrical energy applied during backward movement. The forward speed can be increased because the forward speed is also large.

[0040] The piston elastic member 120 is configured to resiliently move the piston 4 when the current supply from the current supply unit is cut off. 0 is an elastic member that applies elastic force to the piston 40 in the backward direction. The piston elastic member 120 is a second coil spring coupled to the outer circumferential surface of the piston 40. The spring 121 and the third coil spring 122 are included.

[0041] The second coil spring 121 is fitted around the piston 40, and both ends of the second coil spring 121 are connected to the cylinder 20. The second coil spring 121 is provided between the piston and the first flange portion 41. When the piston 40 moves forward, the first flange portion 41 compresses the piston 40. When the piston 40 moves backward, an elastic force is applied to the first flange portion 41 in the direction in which the piston 40 moves backward. Grant.

[0042] The third coil spring 122 is fitted onto the piston 40 and has both ends connected to the body 10. The second coil spring 122 is provided between the piston and the second flange portion 42. When the piston 40 moves forward, the second flange portion 42 compresses the piston 40. When the piston 40 moves backward, an elastic force is applied to the second flange portion 42 in the direction in which the piston 40 moves backward. is granted.

[0043] The operation of the needleless syringe 100 according to the first embodiment of the present invention configured as above will now be described. For example, it is as follows:

[0044] FIG. 2 is a view showing a state in which the piston of the needleless syringe according to the first embodiment of the present invention moves forward. 3 shows the state in which the piston of the needle-free syringe according to the first embodiment of the present invention is retracted. This is a drawing.

[0045] Referring to FIG. 2, when the piston 40 moves forward, the solenoid coil 30 A current is applied in a predetermined first direction, where the first direction is the current flowing through the solenoid coil 3. The direction is set to generate a magnetic force in the direction in which the piston 40 advances around 0. The magnetic force generated by the solenoid coil 30 causes the moving magnetic body 90 to move forward. Take action.

[0046] When the moving magnetic body 90 moves forward, the elastic member 110 for the moving magnetic body is compressed. When the moving magnetic body 90 moves forward by a predetermined distance or more, the moving magnetic body 90 moves forward by the piston.

[0047] Collision with 40. The piston 40 moves forward due to the impact force applied when the moving magnetic body 90 collides. do.

[0048] The impact force is proportional to the mass and moving speed of the moving magnetic body 90. The voltage applied to the solenoid coil 30 and the moving distance of the moving magnetic body 90 are adjusted. By adjusting the voltage to change the impact force, the amount of drug injected at one time can be adjusted. This can be done.

[0049] In this embodiment, the piston 40 moves forward due to the impact force. 0 and the moving magnetic body 90 move forward together at a higher speed than when they move forward together. Therefore, the electrical energy required to move the piston 40 forward can be reduced. do.

[0050] When the piston 40 moves forward, the piston elastic member 120 is compressed. That is, when the piston 40 moves forward, the first flange portion 41 presses the second coil. The third coil spring 121 is compressed, and the third coil spring 122 is compressed by the second flange portion 42. It is compressed.

[0051] The piston 40 is rotated such that the first flange portion 41 is caught on the length adjusting blocker 72. Move forward until When the piston 40 moves forward, the piston 40 pushes the drug in the drug storage portion 22. Apply pressure.

[0052] Referring to FIG. 4(a), when the drug in the drug storage portion 22 is pressurized, the drug is compressed by hydraulic pressure. The nozzle opening / closing valve 50 is opened. When the nozzle opening / closing valve 50 is opened, the drug in the drug storage portion 22 flows through the nozzle It is injected forward through 23.

[0053] As described above, when the piston 40 moves forward, the piston 40 The pin 41 moves forward until it is caught by the length adjusting blocker 72. The forward movement distance of the Stone 40 is limited.

[0054] Therefore, the length of the length-adjusting blocker 72 is connected to the fixed blocker 71. By adjusting the length of the flange 41, the length of the flange 41 that projects rearward can be adjusted. , the forward movement distance of the piston 40 can be adjusted. By adjusting the amount of the drug injected at one time, it is possible to adjust the amount of the drug injected at one time.

[0055] That is, the amount of drug injected at one time is determined by the magnitude of the voltage applied to the solenoid coil 30 and the The forward movement distance of the piston 40 can be adjusted. Thereafter, the current supply unit supplies the solenoid coil 30 with current for a first predetermined time (Δt). After the first set time (Δt) has elapsed after the current is supplied to the solenoid coil 3, 0 to cut off the current supply.

[0056] The first set time (Δt) is set to approximately 250 ms or less. ) will be explained in detail later. Referring to FIG. 3, when the piston 40 moves backward, the solenoid coil 30 The current supply is cut off.

[0057] When the current to the solenoid coil 30 is cut off, the magnetic field generated by the solenoid coil 30 The force that moves the moving magnetic body 90 forward disappears. The moving magnetic body 90 moves backward by the elastic restoring force of the moving magnetic body elastic member 110. That is, the moving magnetic body 90 is moved by the elastic force of the moving magnetic body elastic member 110. and returns to the original position.

[0058] In addition, the piston 40 is returned to its original position by the elastic restoring force of the piston elastic member 120. Move backward to.

[0059] Referring to FIG. 4(b), when the piston 40 moves backward, the inside of the drug container 22 As the pressure in the nozzle decreases, the nozzle opening / closing valve 50 elastically restores its original shape and closes. When the pressure in the drug storage section 22 decreases, the drug supply unit 25 supplies the drug. The drug is filled into the drug storage portion 22 through the hole 22c. Drugs are automatically recharged when moving backwards at 40.

[0060] FIG. 7 shows the state in which a current is applied to the solenoid coil in the needleless syringe according to the first embodiment of the present invention. 10 is a graph showing a comparison of different recoil forces over time.

[0061] On the other hand, the current supply unit supplies the solenoid coil 30 with current for a predetermined first set time (Δt). After the first set time (Δt) has elapsed after supplying current to the power supply, the current is cut off. The first set time (Δt) is the time (t1) at which current is applied to the solenoid coil 30. This is the time difference from the time (t1) to the time (t2) when the current to the solenoid coil 30 is cut off.

[0062] The first set time (Δt) is the time for the first reaction impact generated when the moving magnetic body 90 moves forward. The amount (I1) and the amount of secondary recoil impact generated when the moving magnetic body 90 collides with the piston 40. (I2) is set to a time that can offset each other. When the moving magnetic body 90 moves forward, the needleless syringe 100 The user's hand holding the needleless syringe 100 is in the reverse direction to the forward direction. Primary recoil occurs in the direction of movement.

[0063] When the moving magnetic body 90 collides with the piston 40, the law of action and reaction is The needle-free syringe 100 and the user's hand holding the needle-free syringe 100 are A secondary reaction occurs in the opposite direction.

[0064] Referring to FIG. 7, I1 is the amount of primary recoil impact generated during the primary recoil, and I2 is Indicates the amount of secondary recoil impact that occurs during the secondary recoil. The first recoil impulse (I1) and the second recoil impulse occur at the first set time (△t) difference. The quantities (I2) are identical to each other.

[0065] Therefore, if the first set time (△t) is reduced, the user can reduce the first recoil impact (I 1) and the secondary recoil impact (I2) occur almost simultaneously, so the primary recoil The effect of canceling out the impact (I1) and the secondary recoil impact (I2) is seen. , as shown in FIG. 7(b), the first set time (Δt) is decreased to offset the reaction force. By deriving it at the optimal time possible, a recoil cancellation effect can be achieved. FIG. 8 shows a state in which a current is applied to a solenoid coil in the needleless syringe according to the first embodiment of the present invention. 1 is a graph showing recoil distance over time.

[0066] Referring to FIG. 8, in order to derive the optimum value of the first setting time (Δt), An experiment was conducted to measure the recoil distance while changing the time. In the experiment, the first set time (Δt) was gradually decreased from 800 ms, and the motional magnetic The moving distance of the moving magnetic body was fixed at 60 mm in the experiment. The impact force of the moving magnetic body 90 is kept constant by decreasing the time (Δt). Ta.

[0067] Here, the recoil distance is the distance traveled by the needle-free syringe during one injection of a drug. The shorter the movement distance, the less recoil the user will feel.

[0068] When the voltage applied to the solenoid coil 30 is increased, the movement of the moving magnetic body 90 Since the speed is increased, the first set time (Δt) can be reduced. At this time, if the moving speed of the moving magnetic body 90 increases, the impact force applied to the piston 40 increases. As the impact volume increases, the forward speed is increased compared to the movement speed in order to keep the impact volume constant. The mass of the moving magnetic body 90 must be reduced. Since it is possible to adjust the thickness and reduce the cross-sectional area, it is better to adjust the mass by forming a hole inside rather than adjusting the length. It is desirable to do so.

[0069] In this experiment, the voltage applied to the solenoid coil 30 was increased to The time (Δt) is reduced, but in order to maintain the amount of impact applied to the piston 40, The experiment was carried out while decreasing the mass of the moving magnetic body 90.

[0070] As a result of the experiment, referring to FIG. 8, when the first set time (Δt) is 250 ms or less, It can be seen that there is almost no change in recoil distance.

[0071] Therefore, the first set time (Δt) is 250 ms or less, and the first set time ( The optimum weight of the moving magnetic body 90 due to the reduction in Δt is 100 g or less.

[0072] By setting the time for which a current is applied to the solenoid coil 30 to 250 ms or less, This offsets the recoil felt by the user when using the needleless syringe 100, improving ease of use. To rise.

[0073] As described above, in the present invention, the current is periodically supplied to and cut off from the solenoid coil 30. This allows the piston 40 to repeatedly move forward and backward. In addition, since it allows for the rapid and repeated injection of small amounts of drugs, it is useful in fields such as skin cosmetics. The drug may be injected in small amounts over the skin several times.

[0074] In this embodiment, the piston 40 moves forward due to the impact force. The tonnage 40 and the moving magnetic body 90 move forward at a higher speed than when they move forward together. Therefore, the electrical energy required to move the piston 40 forward is reduced. A little noisy.

[0075] In addition, by adjusting the time during which the current is applied to the solenoid coil 30, In order to minimize the recoil of the needle syringe 100, a separate recoil offset structure is added. Since there is no need for a separate device, the structure is simple and the ease of use is improved. On the other hand, FIG. 5 shows a configuration of a solenoid coil of a needleless syringe according to a first embodiment of the present invention. 10 is a graph showing an example of a current supply waveform.

[0076] Referring to FIG. 5, the current supply unit (not shown) supplies the following current to the piston 40 when the piston 40 moves forward: A voltage of about 100 V is applied to the solenoid coil 30 for the first set time (Δt). When the piston 40 moves backward, the voltage is cut off to the solenoid coil 30. do.

[0077] The time during which the voltage to the solenoid coil 30 is cut off is is set to the same time as the applied time. The time and magnitude of the voltage applied to the solenoid coil 30 are determined taking into consideration the amount of drug, etc. It can be set in a variety of ways.

[0078] On the other hand, FIG. 6 shows a state where a needle is added to the solenoid coil of the needleless syringe according to the first embodiment of the present invention. 10 is a graph showing another example of a current supply waveform.

[0079] Referring to FIG. 6, the current supply unit (not shown) applies a current to the solenoid coil 30. The direction of the current generated in the solenoid coil 30 is repeatedly changed at a predetermined cycle. The direction of the magnetic force can be reversed periodically.

[0080] The current supply unit (not shown) supplies the solenoid coil 92 with current when the moving magnetic body 90 moves forward. A voltage of about 100 V is applied to the coil 30 for the first set time (Δt), and the motional magnetic When the actuator 90 is moved backward, the solenoid coil 30 is It explains that a voltage of approximately -100V is applied between them.

[0081] Therefore, when a voltage of 100 V is applied to the solenoid coil 30, the moving magnetic material A magnetic force is generated in the direction in which the moving magnetic body 90 moves forward, and the moving magnetic body 90 moves forward. Furthermore, when a voltage of −100 V is applied to the solenoid coil 30, the moving magnetic body 90 A magnetic force is generated in the direction in which the moving magnetic body 90 moves backward, causing the moving magnetic body 90 to move backward.

[0082] In addition, the current supply unit (not shown) may be supplied with power from an external power supply source. When the piston 40 moves forward, the stored current is transferred to the solenoid coil. When the piston 40 moves backward, a current is supplied to the solenoid coil 30. a capacitor (not shown) for cutting off the external power supply when the piston 40 moves backward; a DC power supply unit that supplies current from a power supply to the solenoid coil 30; It is also possible to

[0083] That is, the current supply unit (not shown) supplies the current to the solenoid coil 30. The direction of the piston 40 is repeatedly changed at a predetermined cycle. When the piston 40 moves backward, the current stored in the capacitor (not shown) is supplied to the piston. By supplying current from the DC power supply unit, the piston 40 can be moved forward at a faster speed. Make it bigger.

[0084] FIG. 9 shows a configuration in which a cooling chamber is provided in a needleless syringe according to a second embodiment of the present invention. FIG.

[0085] Referring to FIG. 9, a needleless syringe 200 according to a second embodiment of the present invention includes a solenoid coil. The cooling chamber 210 cools the heat generated from the cooling device 30 through a cooling fluid. The remaining configuration and operation are the same as those of the first and second embodiments. Therefore, the following explanation will be omitted and the different configuration will be mainly explained. do.

[0086] The cooling chamber 210 is detachably coupled to the outside of the body 10 .

[0087] The cooling chamber 210 is provided on the outer circumferential surface of the body 10 and is configured to accommodate the solenoid coil 30. The cooling chamber 210 is provided with a cooling fluid supply pipe 211 and a cooling fluid supply pipe 212. A body drainage tube 212 is connected.

[0088] The cooling fluid supply pipe 611 is a flow path for supplying cooling fluid from the outside to the cooling chamber 210. The cooling fluid discharge pipe 212 is a passage for discharging the cooling fluid in the cooling chamber 210 to the outside. The cooling fluid supply pipe 211 and the cooling fluid discharge pipe 212 are provided with:

[0089] Each may be provided with an on-off valve (not shown).

[0090] In this embodiment, a cooling fluid is used to cool the solenoid coil 30. The cooling fluid is described as being water or air, but is not limited to these, and may also be conductive cooling. Of course, it is also possible to use a cooling method.

[0091] The needleless syringe 200 according to the second embodiment of the present invention configured as above has the solenoid The cooling chamber 210 for cooling the coil 30 is provided, so that the The heat of the solenoid coil 30 can be absorbed and maintained at a constant temperature. This can prevent the magnetic force from being weakened by the heat generated from the oid coil 30. FIG. 10 shows a needleless syringe according to a third embodiment of the present invention, which is provided with a piston cover. FIG.

[0092] Referring to FIG. 10, a needleless syringe 300 according to a third embodiment of the present invention includes a cylinder 20 The piston cover 310 is provided between the piston 40 and the piston cover 310 in the first and second embodiments. The remaining configuration and operation are similar to those of the above embodiment. Only the configuration will be described.

[0093] The piston cover 310 is applicable to both the first and second embodiments.

[0094] The piston cover 310 is fixed to the cylinder 20. 10 is provided inside the cylinder 20 and is arranged to cover the end of the piston 40. The piston cover 310 may be inserted into the cylinder 20. It can also be fixed to the inner circumferential surface of the cylinder 20 by adhesive or bonding. is.

[0095] The piston cover 310 is secured to the piston 40 when the piston 40 moves forward. The piston 40 is made of a stretchable material so that it extends forward when the piston 40 moves backward and is restored to its original shape when the piston 40 moves backward. In this embodiment, the piston cover 310 is described as a rubber membrane. .

[0096] The piston cover 310 prevents the drug from directly contacting the end of the piston 40. It is possible.

[0097] Therefore, the user does not need to wipe the end of the piston 40 .

[0098] In addition, the piston cover 310 is provided on the cylinder 20, When the cylinder 20 is replaced, the piston cover 310 can also be replaced.

[0099] The present invention has been described with reference to the embodiments illustrated in the drawings, which are given by way of example only. However, it should be understood that various modifications and equivalent embodiments are possible by those skilled in the art. Therefore, it can be understood that the true technical scope of protection of the present invention is within the scope of the claims. The technical concept must be determined by the industrial applicability.

[0100] The present invention provides the advantages of a needleless syringe that can inject a predetermined drug repeatedly at high speed. There is.

Claims

1. A hollow body; a solenoid coil wound around the outer circumferential surface of the body; a drug container connected to the open front surface of the body so as to be in communication with the body and containing a drug; and a nozzle portion for discharging the drug contained in the drug containing portion to the front side. Under and The solenoid coil is inserted longitudinally into the body and generates a current when a current is applied to the solenoid coil. A moving magnetic body that moves forward due to the magnetic force generated, The magnetic body is inserted in front of the magnetic body inside the body. When the moving magnetic body moves forward, the moving magnetic body The nozzle moves forward due to the impact force applied by the nozzle, and pressurizes the drug in the drug storage portion against the nozzle portion. The piston and The moving magnetic body is provided between the moving magnetic body and the piston, and the moving magnetic body moves backward. an elastic member for the moving magnetic body that applies an elastic force to the moving magnetic body; The nozzle portion is provided to open and close a communication hole between the nozzle portion and the drug storage portion, and the pin When the stone moves forward, it is pushed by the hydraulic pressure applied by the drug from the drug storage section. When the hydraulic pressure is released, the valve is elastically restored to close the communication hole. a nozzle portion opening / closing valve that covers the nozzle portion; The solenoid coil is repeatedly supplied with and cut off current at a predetermined cycle, and a forward / backward driving means for repeating forward movement and backward movement, The forward and backward driving means is When the piston moves forward, a current is supplied to the solenoid coil, and the moving magnetic body When the piston moves backward, the current to the solenoid coil is cut off. a current supply unit that repeats this; When the current supply from the current supply unit is cut off, the piston is elastically moved in a direction in which the piston retracts. a piston elastic member for applying a force; 1. A needleless syringe comprising:

2. The current supply unit applies a current to the solenoid coil for a first predetermined time. , interrupting the current, The mass of the moving magnetic body is 100 g or less, and the first set time is 250 ms or less. The needle-free injector of claim 1 .

3. The elastic member for the moving magnetic body is The moving magnetic body is compressed when it moves forward, and the moving magnetic body is compressed in the direction in which it moves backward. The needle-free syringe according to claim 1 , further comprising a first coil spring that imparts a resilient force to the magnetic body.

4. The piston is a first flange portion that protrudes radially from the outer peripheral surface of the front portion located inside the cylinder; is formed, The piston elastic member is The piston is fitted around the piston, and both ends are provided between the cylinder and the first flange portion. When the piston moves forward, the first pressure is compressed, and when the piston moves backward, the first pressure is The needle-free syringe according to claim 1, further comprising a second coil spring that applies elastic force to the flange portion.

5. The piston is a second flange portion projecting radially from the outer peripheral surface of the rear side portion located inside the body; formed, The piston elastic member is The piston is fitted onto the piston, and both ends are provided between the body and the second flange portion. When the piston moves forward, the second flow is compressed in the direction in which the piston moves backward. The needle-free syringe according to claim 1 , further comprising a third coil spring that imparts elastic force to the lunge portion.

6. The piston is a first flange portion that protrudes radially from the outer peripheral surface of the front portion located inside the cylinder; and, a second flange portion protruding in a radial direction from an outer peripheral surface of a rear side portion located inside the body; , is formed, The piston elastic member is The piston is fitted around the piston, and both ends are provided between the cylinder and the first flange portion. When the piston moves forward, the first pressure is compressed, and when the piston moves backward, the first pressure is a second coil spring that applies elastic force to the flange portion; The piston is fitted onto the piston, and both ends are provided between the body and the second flange portion. When the piston moves forward, the second flow is compressed in the direction in which the piston moves backward. The needle-free syringe according to claim 1, further comprising: a third coil spring that applies elastic force to the lunge portion.

7. A spring is provided between the piston and the cylinder, and when the piston moves forward, The first flange portion is caught by a blocker that limits the forward movement distance of the piston. The needleless injector of claim 4, further comprising:

8. A ring-shaped fixed block having a female screw thread formed on the inner peripheral surface of the cylinder is fixed to the inner peripheral surface of the cylinder. With The first flange is threadedly engaged with the inner peripheral surface of the fixed blocker, and when the piston moves forward, The screw part is formed to hook, and the coupling length that is screwed into the fixed blocker is adjustable. and a length adjustment blocker.

9. The drug storage section has a narrowed section whose cross-sectional area decreases toward the front, and a narrowed section whose cross-sectional area decreases toward the front. and an expanding portion whose area increases again, The contracting portion is supplied with a drug from the outside by a pressure difference generated when the piston moves backward.

10. The needleless injector of claim 1, wherein a drug supply hole is formed.

10. The nozzle opening / closing valve is provided with a ball provided in the communication hole and a valve provided in the nozzle.

10. The needle-free syringe of claim 9, further comprising: a resilient member supporting the ball.

11. The piston is provided in the cylinder and is formed to cover the end of the piston. The piston is made of a stretchable material so that it can expand and contract when moving forward and backward. The needle-free injector of claim 1 further comprising a cover.

12. A solenoid coil is provided outside the body so as to surround the solenoid coil. a cooling chamber that absorbs and cools the heat generated by the magnetron coil through a cooling fluid; The needle-free injector of claim 1 ,

13. A hollow body; a solenoid coil wound around the outer circumferential surface of the body; a drug container connected to the open front surface of the body so as to be in communication with the body and containing a drug; and a nozzle portion for discharging the drug contained in the drug containing portion to the front side. Under and The solenoid coil is inserted longitudinally into the body and generates a current when a current is applied to the solenoid coil. A moving magnetic body that moves forward due to the magnetic force generated, The magnetic body is inserted in front of the magnetic body inside the body. When the moving magnetic body moves forward, the moving magnetic body The nozzle moves forward due to the impact force applied by the nozzle, and pressurizes the drug in the drug storage portion against the nozzle portion. The piston and The moving magnetic body is provided between the moving magnetic body and the piston, and the moving magnetic body moves backward. an elastic member for the moving magnetic body that applies an elastic force to the moving magnetic body; The nozzle portion is provided to open and close a communication hole between the nozzle portion and the drug storage portion, and the pin When the stone moves forward, it is pushed by the hydraulic pressure applied by the drug from the drug storage section. When the hydraulic pressure is released, the valve is elastically restored to close the communication hole. a nozzle portion opening / closing valve that covers the nozzle portion; The solenoid coil is repeatedly supplied with and cut off current at a predetermined cycle, a forward and backward driving means for repeating forward and backward movement; The piston is provided in the cylinder and is formed to cover the end of the piston. The piston is made of a stretchable material so that it can expand and contract when moving forward and backward. Cover and A solenoid coil is provided outside the body so as to surround the solenoid coil. a cooling chamber that absorbs heat generated by the toroidal coil through a cooling fluid to cool the toroidal coil; Including, The forward and backward driving means is When the piston moves forward, a current is supplied to the solenoid coil, and the moving magnetic body When the piston moves backward, the current to the solenoid coil is cut off. a current supply unit that repeats this; When the current supply from the current supply unit is cut off, a piston applies elastic force in a direction in which the piston retracts. and a stone elastic member, The current supply unit applies a current to the solenoid coil for a first predetermined time. , interrupting the current, The mass of the moving magnetic body is 100 g or less, and the first set time is 250 ms or less. A needleless syringe is set up.

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