Liquid jet injection device

Abstract

A liquid jet injection device for injecting a drug solution without using an injection needle is disclosed. The device includes a cylinder, a casing, a hammer movable between one end and the other end of the cylinder, a compressed air generating unit that generates compressed air supplied to the inside of the cylinder, an intake passage connecting the cylinder to one end, and an exhaust passage connecting the cylinder to the outside, a control valve for selectively opening and closing these passages, a pressurizing unit, and a nozzle unit. When the hammer strikes a piston facing an opening formed at the other end of the cylinder, the drug solution stored inside is discharged to the outside. Between the casing and the cylinder is provided a filling section that communicates with the other end of the cylinder and is filled with compressed air when the intake passage is opened. The hammer is configured to move from one end to the other end of the cylinder when the exhaust passage is opened, and then move from the other end to the one end of the cylinder by the compressed air filled in the filling section.

Description

Technical Field

[0001] The present invention relates to a device that can accelerate a liquid and inject it into a desired tissue such as the skin of a user.

Background Art

[0002] Generally, techniques for accelerating a liquid to cut an object or inject it into an object are widely used. An ultra-high pressure cutting method called water jet cutting is a typical example. A water jet is a device that injects water or an abrasive mixture pressurized at ultra-high pressure onto the surface of an object through an orifice and a nozzle, and cuts the object into a desired shape.

[0003] On the other hand, generally, a syringe is used to inject a drug into a tissue. The structure of a syringe is composed of a needle part inserted into a tissue, a cylinder filled with a drug solution, and a piston inserted and moved inside the cylinder. Such a syringe is configured to inject the drug filled in the cylinder into the tissue by moving it with the piston.

[0004] Although a syringe is an efficient drug delivery means, there have been pointed out risks of infection by a needle, fear of a needle, inconvenience in use, etc. Therefore, recently, research on needleless syringes has been continuously conducted.

[0005] As an example of a needleless syringe, it is possible to realize a drug delivery device that can stably transmit a drug while continuously supplying it by constructing an energy source that can pressurize the piston of a syringe cylinder and using an orifice and nozzle structure like a water jet. At this time, a high-pressure water jet stream is mixed with a mixture supplied from the outside and passes through the nozzle at a very high speed. Using this, it is possible to control the water jet to operate only at a specific moment and supply drugs from the outside in order according to the corresponding operation procedure.

[0006] On the other hand, some needleless syringes use strong air pressure to compress air, then apply pressure to the cylinder's piston to inject the drug contained in the cylinder into the skin. In this method, an excessive amount of drug is consumed, the high output intensity can damage skin tissue, and the continuous injection rate is relatively low, resulting in many limitations in actual use. To solve these conventional problems, the development of needleless syringes with a simpler operating mechanism for drug injection is being considered. [Overview of the project] [Problems that the invention aims to solve]

[0007] One objective of the present invention is to provide a liquid jet injection device in which the process of generating a water jet by the movement of a piston that moves a drug using air pressure can be stably and repeatedly operated, and the configuration is simplified. [Means for solving the problem]

[0008] To achieve the object of the present invention, a liquid jet injection device according to one embodiment of the present invention includes a cylinder, a casing surrounding the cylinder, a cylinder section having a hammer housed inside the cylinder and formed to be movable between one end and the other end of the cylinder, a control valve configured to selectively open and close an intake passage connecting a compressed air generating section that generates compressed air supplied to the inside of the cylinder and one end of the cylinder, and an exhaust passage connecting one end of the cylinder to the outside, a pressurizing section having a piston facing an opening formed at the other end of the cylinder, and a nozzle section coupled to the pressurizing section and formed to discharge the liquid drug stored inside to the outside when the hammer collides with the piston, wherein a filling section is provided between the casing and the cylinder, communicating with the other end of the cylinder, and filled with compressed air when the intake passage is opened, and the hammer is configured to move from the other end to the one end of the cylinder when the exhaust passage is opened, by the compressed air that has been compressed and filled into the filling section.

[0009] According to one example of the present invention, the hammer may be configured such that, when the intake passage is opened, it moves to the other end of the cylinder by the compressed air supplied to one end of the cylinder and collides with the piston, and when the exhaust passage is opened while the hammer is at the other end of the cylinder, it is pushed to the one end of the cylinder by the airflow that escapes to the outside of the cylinder through the exhaust passage due to the pressure difference between the inside and outside of the cylinder caused by the compressed air filled in the filling section.

[0010] According to one example of the present invention, the filling portion may be formed to surround a part of the side surface of the cylinder.

[0011] According to one example of the present invention, a partition plate is provided between the other end of the cylinder and the piston, and the partition plate may be provided with a communication portion formed to connect an opening formed at the other end of the cylinder with the filling portion.

[0012] According to one example of the present invention, a connecting passage is provided between the intake passage and the exhaust passage, communicating with the inside of the cylinder, the intake passage, and the exhaust passage, and the control valve may be controlled so that the connecting passage selectively communicates with either the intake passage or the exhaust passage.

[0013] According to one example of the present invention, the piston may include a first piston that faces an opening formed at the other end of the cylinder and collides with the hammer, and a second piston that is positioned in the nozzle section, faces the first piston, and is configured to collide with the first piston that has collided with the hammer when the intake passage is opened, thereby discharging the liquid drug stored inside the nozzle section to the outside.

[0014] According to one example of the present invention, the nozzle portion may include a nozzle housing that accommodates the second piston, and a piston cushion interposed between the nozzle housing and the second piston, which applies an elastic force to the second piston to return it to its original position after it has moved due to a collision with the first piston.

[0015] According to one example of the present invention, the casing facing one end of the cylinder is provided with a magnetic material having magnetic force, and the hammer may be formed to be coupled to the magnetic material by magnetic force.

[0016] According to one example of the present invention, at least one of the two opposing surfaces of the magnetic material and the hammer may be provided with a hammer cushion formed to absorb impact when they collide with each other.

[0017] A liquid jet injection device according to another embodiment of the present invention includes a cylinder, a casing surrounding the cylinder, a cylinder section having a hammer housed inside the cylinder and formed to be movable between one end and the other end of the cylinder, a control valve configured to selectively open and close an intake passage connecting a compressed air generating section that generates compressed air supplied to the inside of the cylinder and one end of the cylinder, and an exhaust passage connecting one end of the cylinder to the outside, a pressurizing section having a piston facing an opening formed at the other end of the cylinder, and a nozzle section coupled to the pressurizing section and formed to discharge the liquid drug stored inside to the outside when the hammer collides with the piston, wherein the hammer is configured to return from the other end to one end of the cylinder when the exhaust passage is opened, by the compressed air configured to be compressed inside the casing when the intake passage is opened. [Effects of the Invention]

[0018] The effects of the present invention obtained by the above-described solution are as follows.

[0019] The liquid jet injection device includes a cylinder section having a cylinder that houses a hammer and a casing that surrounds the cylinder. A filling section is provided between the casing and the cylinder, which is filled with compressed air and communicates with the other end of the cylinder. The filling section is filled with compressed air when the intake passage, which forms a flow path for compressed air inside the cylinder, is opened. When the exhaust passage formed at one end of the cylinder is opened, the compressed air in the filling section moves the hammer back to its initial position due to the pressure difference between the inside and outside of the cylinder.

[0020] According to the configuration of such a liquid jet injection device, no separate configuration is required to move the hammer moved by compressed air back to the initial position, and it can be realized by the operation of opening the exhaust flow path with a control valve. Therefore, the configuration for the operation of the liquid jet injection device can be simplified, the manufacturing cost of the liquid jet injection device can be reduced, and price competitiveness can be ensured. Furthermore, the components of the liquid jet injection device can be simplified, the failure rate can be reduced, and the maintenance cost can be reduced.

Brief Description of the Drawings

[0021] [Figure 1] It is a conceptual diagram of a liquid jet injection device according to an embodiment of the present invention. [Figure 2] It is a conceptual diagram showing a state where a part of the liquid jet injection device shown in FIG. 1 is separated. [Figure 3] It is a cross-sectional view taken along the line A-A shown in FIG. 2. [Figure 4] It is a conceptual diagram showing a state before the intake flow path of the liquid jet injection device shown in FIG. 1 is opened. [Figure 5] In the liquid jet injection device shown in FIG. 4, it is a conceptual diagram showing a state where the intake flow path is opened and the hammer moves from one end of the cylinder to the other end. [Figure 6] In the liquid jet injection device shown in FIG. 5, it is a conceptual diagram showing a state where the hammer moves to the other end of the cylinder and collides with the piston, and the piston moves a certain distance by the impact. [Figure 7] In the liquid jet injection device shown in FIG. 6, it is a conceptual diagram showing a state where after the hammer collides with the piston, the exhaust flow path is opened and the hammer moves toward one end of the cylinder. [Figure 8] In the liquid jet injection device shown in FIG. 7, it is a conceptual diagram showing a state where the hammer moves to one end of the cylinder and returns to the initial position.

Embodiments for Carrying Out the Invention

[0022] Hereinafter, the liquid jet injection device 100 according to the present invention will be described in more detail with reference to the drawings.

[0023] In this specification, even in different embodiments, the same or similar configurations are denoted by the same or similar reference numerals, and redundant descriptions thereof are omitted.

[0024] The singular forms include the plural forms unless the context clearly dictates otherwise.

[0025] FIG. 1 is a conceptual diagram of a liquid jet injection device 100 according to an embodiment of the present invention. FIG. 2 is a conceptual diagram showing a state in which a part of the liquid jet injection device 100 shown in FIG. 1 is separated. FIG. 3 is a cross-sectional view taken along the line A-A shown in FIG. 2.

[0026] Referring to FIGS. 1 to 3, the liquid jet injection device 100 includes a cylinder part 110, a control valve 120, a pressurizing part 130, and a nozzle part 140.

[0027] The cylinder part 110 has a cylinder 111, a casing 112, and a hammer 113.

[0028] The cylinder 111 extends in one direction. Inside the cylinder 111, a space is provided in which the hammer 113 is movable between one end and the other end of the cylinder 111. The cylinder 111 may be formed in a cylindrical shape with both ends open, or may be formed with only the other end open. Further, the shape of the cylinder 111 is not limited to a cylindrical shape, and may be formed in a non-cylindrical, other polygonal columnar shape provided with a space for the movement of the hammer 113 inside. [[ID=?]]

[0029] [[ID=?]] The casing 112 is disposed outside the cylinder 111 and is formed to surround the cylinder 111.

[0030] It seems there are some tags in the original text that are not properly closed or might be incorrect. I've translated as much as possible while keeping the tags intact. If you can correct the original text for those tags, it would be better for a more accurate translation.The hammer 113 is housed inside the cylinder 111a and is formed to be movable between one end and the other end of the cylinder 111. The hammer 113 may be formed corresponding to the inner surface of the cylinder 111. For example, if the shape of the cylinder 111 is cylindrical, the shape of the hammer 113 may also be formed as a cylinder or cylindrical shape. The opposing surfaces of the cylinder 111 and the hammer 113 are formed corresponding to each other, so that the hammer 113 can be stably guided and moved inside the cylinder 111.

[0031] The control valve 120 may be configured to selectively open and close the intake passage 161 and the exhaust passage 162.

[0032] The intake passage 161 forms a passage through which compressed air flows into the inside of the cylinder 111. The intake passage 161 is configured to connect the compressed air generation unit 11, which generates compressed air, with one end of the cylinder 111. That is, one side of the intake passage 161 is in communication with the compressed air generation unit 11, and the other side is in communication with one end of the cylinder 111. The compressed air generation unit 11 may be provided with a pressure valve 11a that adjusts the pressure of the compressed air supplied to the inside 111a of the cylinder 111.

[0033] The exhaust passage 162 forms a passage connecting one end of the cylinder 111 to the outside of the cylinder 111. The outside of the cylinder 111 may be the atmosphere.

[0034] A connecting passage 163 may be provided between the intake passage 161 and the exhaust passage 162. The connecting passage 163 communicates with the interior 111a of the cylinder 111 and the intake passage 161, and also communicates with the interior 111a of the cylinder 111 and the exhaust passage 162.

[0035] The control valve 120 can control the connection passage 163 to selectively communicate with either the intake passage 161 or the exhaust passage 162. That is, the control valve 120 may be configured to close the communication between the connection passage 163 and the exhaust passage 162 when the connection passage 163 is connected to the intake passage 161. Conversely, the control valve 120 may be configured to close the communication between the connection passage 163 and the intake passage 161 when the connection passage 163 is connected to the exhaust passage 162.

[0036] The control valve 120 can open and close the intake passage 161 and the exhaust passage 162 depending on whether power is applied or not. For example, the control valve 120 may be configured to connect the intake passage 161 and the connecting passage 163 when power is applied, and to connect the exhaust passage 162 and the connecting passage 163 when power is cut off.

[0037] The pressurizing section 130 has a piston 131 facing an opening formed at the other end of the cylinder 111. The pressurizing section 130 may also have a pressurizing section cover 132 that surrounds at least a portion of the piston 131.

[0038] The nozzle section 140 is connected to the pressurizing section 130 and is configured to discharge the liquid chemical stored inside to the outside when the hammer 113 collides with the piston 131.

[0039] The cylinder section 110, the pressurizing section 130, and the nozzle section 140 are formed to be separable from each other and may be provided as a disposable treatment configuration for purposes such as diversifying injection techniques and preventing infection.

[0040] On the other hand, a filling section 150 is provided between the casing 112 and the cylinder 111.

[0041] The filling section 150 communicates with the other end of the cylinder 111 and forms a space into which compressed air is compressed and filled when the intake passage 161 is opened.

[0042] Furthermore, the filling section 150 may be formed to surround a portion of the side surface of the cylinder 111. For example, the filling section 150 may be formed only on the lower part of the cylinder 111, excluding the upper part, relative to the liquid jet injection device 100 shown in Figure 1. This allows for a wider variety of shapes and / or arrangements of the filling section 150, enabling a wider range of designs for the liquid jet injection device 100. However, the filling section 150 may be formed to surround the entire side surface of the cylinder 111, rather than just a portion of it.

[0043] Here, the hammer 113 may be configured to return to one end of the cylinder 111 from the other end when the exhaust passage 162 is opened, by the compressed air that is compressed within the casing 112 when the intake passage 161 is opened.

[0044] More specifically, the hammer 113 is configured to move from one end to the other end of the cylinder 111 when the intake passage 161 is opened, and then when the exhaust passage 162 is opened, it moves from the other end to the one end of the cylinder 111 by the compressed air that has been compressed and filled into the filling section 150.

[0045] For example, when the intake passage 161 is opened, the hammer 113 moves to the other end of the cylinder 111 by the compressed air supplied to one end of the cylinder 111 and collides with the piston 131.

[0046] Alternatively, when the exhaust passage 162 is opened while the hammer 113 is moved to the other end of the cylinder 111, the compressed air that has been compressed and filled into the filling section 150 may be pushed to one end of the cylinder 111 by the airflow escaping to the outside of the cylinder 111 via the exhaust passage 162 due to the pressure difference between the inside 111a of the cylinder 111 and the outside.

[0047] On the other hand, the liquid jet injection device 100 may include a control unit 12 that performs control-related functions, such as a control valve 120 and a compressed air generation unit 11. The control unit 12 may also include a display module (not shown) for a user interface.

[0048] On the other hand, a partition plate 123 may be provided between the other end of the cylinder 111 and the piston 131, as shown in Figure 3.

[0049] The partition plate 123 may be provided with a connecting portion 123a.

[0050] The communication portion 123a is formed to connect the opening formed at the other end of the cylinder 111 with the filling portion 150.

[0051] Furthermore, the communication portion 123a of the partition plate 123 may have a first hole 123a1 that communicates with an opening formed at the other end of the cylinder 111, and a second hole 123a2 that communicates with the first hole 123a1 and the filling portion 150.

[0052] According to the structure of the first hole 123a1 and the second hole 123a2, even without providing a separate hole structure to connect the opening formed at the other end of the cylinder 111 with the filling portion 150, a flow path for compressed air can be formed between the opening formed at the other end of the cylinder 111 and the filling portion 150 through the first hole 123a1 and the second hole 123a2, with a thickness equal to the thickness of the connecting portion 123a.

[0053] On the other hand, the piston 131 may have a first piston 131a and a second piston 131b.

[0054] The first piston 131a is formed to face an opening formed at the other end of the cylinder 111 and to collide with the hammer 113.

[0055] The second piston 131b is positioned in the nozzle section 140 so as to face the first piston 131a. The second piston 131b is configured to collide with the first piston 131a, which has collided with the hammer 113, when the intake passage 161 is opened, and to discharge the liquid chemical stored inside the nozzle section 140 to the outside.

[0056] A first piston seal 131a1 and a second piston seal 131b1 may be formed on the outer circumferential surfaces of the first piston 131a and the second piston 131b, respectively, for sealing the first piston 131a and the second piston 131b.

[0057] On the other hand, the nozzle portion 140 may also have a nozzle housing 141 and a piston cushion 142.

[0058] The nozzle housing 141 is formed to surround the second piston 131b so as to accommodate the second piston 131b. The second piston 131b may be formed to be movable forward and backward while surrounded by the nozzle housing 141.

[0059] Furthermore, the nozzle housing 141 may have an inlet 141a provided on the side and a discharge port 141b provided at the end through which the liquid chemical is discharged to the outside.

[0060] The piston cushion 142 is interposed between the nozzle housing 141 and the second piston 131b, and can apply an elastic force to the second piston 131b so as to return the second piston 131b, which has moved due to collision with the first piston 131a, to its original position.

[0061] Furthermore, the nozzle section 140 may further include a chemical injection valve 143 and a chemical discharge valve 144.

[0062] Furthermore, fluids such as chemical solutions need to move stably in one direction from inlet to outlet. Check valves are very commonly used to block or control the flow of fluid in a particular direction. Various types of check valves are commercially available and readily accessible, and can be selectively applied based on the fluid flow direction, pressure, material, etc.

[0063] The chemical injection valve 143 is positioned between the inlet 141a and the inside of the nozzle portion 140, and can be configured to selectively open and close the inlet 141a based on the pressure difference.

[0064] The chemical discharge valve 144 is positioned between the discharge port 141b and the inside of the nozzle portion 140, and can be configured to selectively open and close the discharge port 141b based on the pressure difference.

[0065] Here, the piston 131 may be configured to increase the internal pressure of the nozzle portion 140 when it collides with the hammer 113.

[0066] The process by which the chemical injection valve 143 and the chemical discharge valve 144 operate will be described later with reference to other drawings of the present invention.

[0067] On the other hand, a magnetic material 112a having magnetic force may be provided on the casing 112 facing one end of the cylinder 111. Here, the hammer 113 may be formed to be magnetically coupled to the magnetic material 112a. This allows the hammer 113 to stably maintain its initial position after it has returned to its initial position when the hammer 113 moves from the other end of the cylinder 111 back to the first end.

[0068] Furthermore, a hammer cushion 113a may be provided on at least one of the two opposing surfaces of the magnetic material 112a and the hammer 113, so as to absorb the impact when the magnetic material 112a and the hammer 113 collide with each other.

[0069] The operation process of the liquid jet injection device 100 will be explained below with reference to Figures 4 to 8.

[0070] Figure 4 is a conceptual diagram showing the state of the liquid jet injection device 100 shown in Figure 1 before the intake passage 161 is opened. Figure 5 is a conceptual diagram showing the state of the liquid jet injection device 100 shown in Figure 4 after the intake passage 161 is opened and the hammer 113 moves from one end to the other end of the cylinder 111. Figure 6 is a conceptual diagram showing the state of the liquid jet injection device 100 shown in Figure 5 after the hammer 113 has moved to the other end of the cylinder 111 and struck the piston 131, causing the piston 131 to move a certain distance due to the impact. Figure 7 is a conceptual diagram showing the state of the liquid jet injection device 100 shown in Figure 6 after the hammer 113 has struck the piston 131, after the exhaust passage is opened and the hammer 113 moves towards one end of the cylinder 111. Figure 8 is a conceptual diagram showing the state of the liquid jet injection device 100 shown in Figure 7 after the hammer 113 has moved to one end of the cylinder 111 and returned to its initial position.

[0071] Referring to Figures 4 to 8, compressed air generated in the compressed air generation unit 11 is supplied to the interior 111a of the cylinder 111, and the air pressure from the compressed air supplied to the interior 111a of the cylinder 111 causes the hammer 113 to move forward. In this way, the air pressure energy is first converted into kinetic energy, the kinetic energy is secondarily converted into collision energy by the collision between the hammer 113 and the first piston 131a, and the collision energy from the collision between the first piston 131a and the second piston 131b is again converted back into kinetic energy in a tertiary manner, thereby pressurizing the liquid chemical filled inside the nozzle unit 140 and causing it to be discharged through the discharge port 141b. Subsequently, when the exhaust passage 162 is opened, the compressed air that was compressed and filled in the filling unit 150 tries to escape through the exhaust passage 162, and the force causing the hammer 113 to return to its initial position.

[0072] More specifically, referring to Figure 4, in the initial state of the liquid jet injection device 100, as shown in Figure 5, when the intake passage 161 is opened via the control valve 120, compressed air generated in the compressed air generation unit 11 is supplied to the interior 111a of the cylinder 111 via the intake passage 161. The compressed air supplied to the interior 111a of the cylinder 111 moves the hammer 113 from one end of the cylinder 111 to the other end. At this time, compressed air is compressed and filled into the filling section 150 formed between the cylinder 111 and the casing 112.

[0073] Next, referring to Figure 6, the hammer 113 moves to the other end of the cylinder 111 by compressed air and collides with the first piston 131a. The impact energy between the hammer 113 and the first piston 131a is transmitted to the second piston 131b, pushing it out. At this time, the impact energy transmitted to the second piston 131b is converted into high-speed micro-motion by the piston cushion 142, pressurizing and pushing out the liquid chemical in the nozzle section 140 towards the discharge port 141b. Subsequently, the liquid chemical discharge valve 144 is pressurized and opened, causing the liquid chemical in the nozzle section 140 to be discharged to the outside through the discharge port 141b.

[0074] Next, referring to Figure 7, after the pressurization of the second piston 131b is completed, negative pressure is generated inside the nozzle section 140, and the drug injection valve 143, which is provided between the inlet 141a (connected to an external drug storage device, not shown) and the inside of the nozzle section 140, opens, and the drug is filled into the nozzle section 140 due to the pressure difference between the inside and outside of the nozzle section 140. After the filling of the drug is completed, when the negative pressure inside the nozzle section 140 is removed, the drug injection valve 143 automatically closes. At the same time, the drug discharge valve 144 is closed, which prevents the drug discharged through the discharge port 141b of the nozzle section 140 and blood generated by the wound from flowing back into the inside.

[0075] Furthermore, as shown in Figure 7, the hammer 113 returns to its initial position through a process in which it is pushed by the force of compressed air, which is compressed and filled into the filling section 150 formed between the cylinder 111 and the casing 112, attempting to escape through the exhaust passage 162. Alternatively, the hammer 113 may return to its initial position in part due to the impact repulsion force generated after the hammer 113 collides with the first piston 131a.

[0076] Finally, as shown in Figure 8, the hammer 113 returns to its initial position and can be stably maintained in its initial position by the magnetic body 112a positioned opposite one end of the cylinder 111.

[0077] The above description is merely illustrative and can be modified in various ways by a person with ordinary skill in the art to which the present invention pertains, without departing from the scope and technical idea of ​​the described embodiments. The above embodiments can be implemented individually or in any combination.

Claims

1. A cylinder section having a cylinder, a casing surrounding the cylinder, and a hammer housed inside the cylinder and formed to be movable between one end and the other end of the cylinder, A control valve configured to selectively open and close an intake passage connecting a compressed air generating unit that generates compressed air supplied to the inside of the cylinder and one end of the cylinder, and an exhaust passage connecting one end of the cylinder to the outside, A pressurizing section having a piston facing an opening formed at the other end of the cylinder, It includes a nozzle portion connected to the pressurizing portion and formed to discharge the liquid chemical stored inside to the outside when the hammer collides with the piston, Between the casing and the cylinder, there is a filling section that communicates with the other end of the cylinder and is filled with compressed air when the intake passage is opened. A liquid jet injection device characterized in that the hammer, while in a state where it has moved from one end to the other end of the cylinder when the intake passage is opened, moves from the other end to the one end of the cylinder by the compressed air that has been compressed and filled into the filling section when the exhaust passage is opened.

2. The aforementioned hammer, When the intake passage is opened, the compressed air supplied to one end of the cylinder moves to the other end of the cylinder and collides with the piston. The liquid jet injection device according to claim 1, characterized in that when the exhaust passage is opened while the hammer has moved to the other end of the cylinder, the compressed air filled in the filling section is pushed to one end of the cylinder by the airflow escaping to the outside of the cylinder through the exhaust passage due to the pressure difference between the inside and outside of the cylinder.

3. The liquid jet injection device according to claim 1, characterized in that the filling portion is formed to surround a part of the side surface of the cylinder.

4. A partition plate is provided between the other end of the cylinder and the piston. The liquid jet injection device according to claim 3, characterized in that the partition plate is provided with a communication portion formed to connect an opening formed at the other end of the cylinder with the filling portion.

5. Between the intake passage and the exhaust passage, a connecting passage is provided that communicates with the inside of the cylinder, the intake passage, and the exhaust passage. The liquid jet injection device according to claim 1, characterized in that the control valve controls the connecting passage to selectively communicate with either the intake passage or the exhaust passage.

6. The aforementioned piston is A first piston, which faces an opening formed at the other end of the cylinder and collides with the hammer, The liquid jet injection device according to claim 1, further comprising: a second piston disposed in the nozzle portion, facing the first piston, and configured to collide with the first piston upon impact with the hammer when the intake passage is opened, thereby discharging the liquid drug stored inside the nozzle portion to the outside.

7. The nozzle portion is The nozzle housing that houses the second piston, The liquid jet injection device according to claim 6, further comprising a piston cushion interposed between the nozzle housing and the second piston, which applies an elastic force to the second piston to return the second piston to its original position after it has moved due to a collision with the first piston.

8. The casing facing one end of the cylinder is provided with a magnetic material having magnetic force. The liquid jet injection device according to claim 1, characterized in that the hammer is formed to be coupled to the magnetic material by magnetic force.

9. The liquid jet injection device according to claim 8, characterized in that at least one of the two opposing surfaces of the magnetic material and the hammer is provided with a hammer cushion formed to absorb impact when they collide with each other.

10. A cylinder section having a cylinder, a casing surrounding the cylinder, and a hammer housed inside the cylinder and formed to be movable between one end and the other end of the cylinder, A control valve configured to selectively open and close an intake passage connecting a compressed air generating unit that generates compressed air supplied to the inside of the cylinder and one end of the cylinder, and an exhaust passage connecting one end of the cylinder to the outside, A pressurizing section having a piston facing an opening formed at the other end of the cylinder, It includes a nozzle portion connected to the pressurizing portion and formed to discharge the liquid chemical stored inside to the outside when the hammer collides with the piston, A liquid jet injection device characterized in that the hammer is configured to return to one end of the cylinder from the other end when the exhaust passage is opened, by compressed air which is configured to be compressed within the casing when the intake passage is opened.

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