CN112451807A

CN112451807A - Nozzle assembly, injector body and needleless injector comprising same

Info

Publication number: CN112451807A
Application number: CN201911071848.2A
Authority: CN
Inventors: 李芝银
Original assignee: Lee Jee Eun
Current assignee: Lee Jee Eun
Priority date: 2019-09-06
Filing date: 2019-11-05
Publication date: 2021-03-09
Also published as: KR20210029452A; KR102336021B1

Abstract

The invention relates to a nozzle assembly, an injector body and a needleless injector comprising the injector body. A needleless injector in accordance with one embodiment of the present invention comprises: a nozzle unit which contains a chemical liquid therein and discharges the chemical liquid; and a syringe body that applies pressure to the nozzle assembly to discharge the liquid medicine. The nozzle assembly includes: a nozzle container which provides a space for containing a chemical liquid therein and has a discharge hole for discharging the chemical liquid; and a plunger that applies pressure to the chemical liquid in the nozzle container. The syringe body includes: a piston connected to the plunger; a piston elastic member that applies elastic force to the piston in a first direction in which the plunger applies pressure to the drug solution; a charging portion that moves the piston in a second direction opposite to the first direction to a lock position; and a locking portion that locks at the locking position to stop the piston or to release the locking.

Description

Nozzle assembly, injector body and needleless injector comprising same

Technical Field

The present invention relates to a nozzle assembly, a syringe body and a needleless syringe including the same, and more particularly, to a nozzle assembly, a syringe body and a needleless syringe including the same, which can continuously inject a liquid medicine without a needle.

Background

Conventionally, a needle syringe is used to inject a drug, i.e., a liquid medicine, into an animal or human body. However, such a needle-containing syringe has various problems such as cross contamination of the subject to be injected, pain associated with such injection, and breakage and falling of the needle in the subject to be injected. Particularly in the event that the needle breaks or falls off within the subject receiving the injection, not only may the health and safety of the subject be compromised, but a considerable economic problem may be induced.

As an attempt to avoid the problems associated with needle-based injectors currently in use, various enterprises are tightening the development of needle-free injectors.

Needleless injectors do not have a needle that penetrates the skin of an animal or human to inject a drug solution, and inject the drug solution simply by pressure.

However, some of the conventional needleless injectors are configured such that a drug solution to be injected into a subject and an instrument part are integrally provided, and therefore, they are not hygienic enough and may be infected. Alternatively, some products of the manual needleless syringe are loaded once and only one injection of the liquid medicine is performed, which is inconvenient in continuous injection.

Disclosure of Invention

Solves the technical problem

The present invention aims to provide a nozzle assembly, an injector body and a needleless injector comprising the same which are hygienic and which are capable of reducing the risk of infection.

Further, the present invention is directed to a nozzle assembly capable of continuously injecting a liquid medicine, a syringe body, and a needleless syringe including the same.

The problem to be solved by the present invention is not limited thereto, and other problems not mentioned are clearly understood by those skilled in the art from the following description.

Technical scheme

The present invention provides needleless injectors. According to one embodiment, a needleless injector comprises: a nozzle unit which contains a chemical liquid therein and discharges the chemical liquid; and a syringe body that applies pressure to the nozzle assembly to discharge the liquid medicine; the nozzle assembly includes: a nozzle container which provides a space for containing a chemical liquid therein and has a discharge hole for discharging the chemical liquid; and a plunger for applying pressure to the chemical liquid in the nozzle container; the syringe body includes: a piston connected to the plunger; a piston elastic member that applies elastic force to the piston in a first direction in which the plunger applies pressure to the drug solution; a packing section that moves the piston to a Locking (packing) position in a second direction opposite to the first direction; and a locking portion that locks at the locking position to stop the piston or to release the locking.

The nozzle assembly is removable from the injector body.

The nozzle container may be formed with an injection hole into which a chemical solution can be injected from the outside.

The plunger may be injected into and separated from the nozzle container through the injection hole.

One end of the plunger may be exposed to the outside of the nozzle container through the injection hole, and the one end of the plunger and the one end of the piston may be engaged with each other so as to be fixed with respect to the first direction and the second direction.

The space of the nozzle container may include a first space adjacent to the discharge hole and communicating with the discharge hole, and a second space farther from the discharge hole than the first space, the first space having a diameter smaller than a diameter of the second space when viewed from the first direction, and the other end of the plunger may be inserted into the first space from the second space.

The plunger may be provided with a chemical solution passage that passes through a region of a side surface and the other end of the plunger, the first space may be provided with a backflow prevention portion that prevents backflow of fluid from the discharge hole to the first space, the region of the side surface may be located in the second space when the plunger is located at the lock position, and may be located in the first space when the plunger is located closer to the discharge hole than the lock position.

The present invention also provides a nozzle unit which contains a chemical liquid therein, is attachable to and detachable from a syringe body, and discharges the chemical liquid by pressure applied from the syringe body. According to one embodiment, a nozzle assembly comprises: a nozzle container which is provided with a space for containing a liquid medicine therein and is provided with a discharge hole for discharging the liquid medicine; and a plunger for applying pressure to the chemical liquid in the nozzle container; the plunger is attached to and detached from the piston of the syringe body, and is moved by the movement of the piston.

The nozzle container may be formed with an injection hole into which the chemical solution can be injected from the outside.

The plunger may be inserted into and removed from the nozzle container through a surface of the nozzle container opposite to a surface thereof on which the discharge hole is formed, one end of the plunger may be exposed to the outside of the nozzle container in a state where the plunger is inserted into the nozzle container, and a grip portion that can be gripped by a user may be provided at the one end of the plunger, and the grip portion may be removed from the plunger after the plunger is inserted into the nozzle container.

The plunger may be provided with a chemical solution passage that passes through a region of a side surface and the other end of the plunger, the first space may be provided with a backflow prevention portion that prevents backflow of fluid from the discharge hole to the first space, the region of the side surface may be located in the second space when the plunger is located at a lock position, and may be located in the first space when the plunger is located closer to the discharge hole than the lock position.

The first space may include: an insertion space into which the plunger is inserted; a flap providing space which communicates with the discharge hole and is adjacent to the discharge hole than the insertion space; an anti-backflow wall in which an anti-backflow hole opened and closed by the anti-backflow unit is formed between the insertion space and the flap providing space; the backflow prevention part may include: a flap member provided at a position corresponding to the backflow preventing hole of the flap providing space; a flap elastic member that applies an elastic force to the flap member in a direction from the discharge hole toward the backflow prevention hole.

In addition, the present invention provides a syringe body to which a nozzle unit containing a chemical liquid therein is attached and detached, and which applies pressure to the nozzle unit to discharge the chemical liquid. According to one embodiment, the injector body comprises: a piston for attaching and detaching a plunger of the nozzle assembly; a piston elastic member that applies elastic force to the piston in a first direction in which the plunger applies pressure to the drug solution; a charging section that moves the piston in a second direction opposite to the first direction to a lock position; a lock portion that locks at the lock position to stop the piston or releases the lock; and a housing formed with a space in which the piston is provided.

The housing may have a surface facing one end of the piston that is open, a nozzle block coupling hole that is open from the surface facing the one end of the piston to a region corresponding to the one end of the piston may be formed in a side surface of the housing so that the nozzle block can be inserted, and an opening/closing member that opens and closes the nozzle block coupling hole may be provided in the nozzle block coupling hole.

Effects of the invention

The nozzle assembly, the injector body and the needleless injector comprising the same of the embodiments of the present invention are hygienic and can reduce the risk of infection.

In addition, the nozzle assembly, the injector body and the needleless injector comprising the same of the embodiment of the invention can continuously inject the liquid medicine.

Drawings

Fig. 1 is a perspective view of a needleless injector of one embodiment of the present invention.

Fig. 2 is a side sectional view of the needle free injector of fig. 1, after the nozzle assembly has been attached to the injector body, in a ready to operate state.

Fig. 3 is a side sectional view of the area adjacent to the discharge orifice of the needleless injector of fig. 2.

Fig. 4 is a side sectional view of the area adjacent the other end of the plunger of the needleless injector of fig. 2.

Fig. 5 is a side sectional view of the piston of the needle free injector of fig. 1 moved to a locked position.

Fig. 6 is a side cross-sectional view of the area adjacent to the discharge orifice of the needleless injector of fig. 5.

Fig. 7 is a side sectional view of the piston of the needle free injector of fig. 1 in a locked position.

Fig. 8 is a side cross-sectional view of the area adjacent to the discharge orifice of the needleless injector of fig. 7.

Fig. 9 is a side sectional view of the area adjacent the other end of the plunger of the needleless injector of fig. 7.

Fig. 10 is a side sectional view of the needleless syringe of fig. 1 in a drug solution discharge state.

Fig. 11 is a side sectional view of a region adjacent to the discharge orifice of the needleless syringe of fig. 1 in a state where the drug solution is being discharged.

Fig. 12 is a side cross-sectional view of the needleless injector of fig. 10.

Fig. 13 is a side cross-sectional view of the needle-less syringe of fig. 1 showing the relaxation of the force applied to the handle after discharge of the medical fluid.

Fig. 14 to 16 are views sequentially showing an example of a method of injecting a chemical solution into the nozzle assembly of fig. 1.

Detailed Description

Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The present embodiments are provided to more fully explain the present invention to those of ordinary skill in the art. Therefore, the shapes of the elements in the drawings are exaggerated to emphasize more clear description.

Fig. 1 is a perspective view of a needleless injector 10 of one embodiment of the present invention. Fig. 2 is a side sectional view of the needle free injector 10 of fig. 1, with the nozzle assembly 1000 attached to the injector body 2000, in a ready to operate state. Fig. 3 is a side sectional view of the area adjacent the discharge orifice 1120 of the needle free injector 10 of fig. 2. Fig. 4 is a side sectional view of the area adjacent the other end of the piston 2100 of the needle free injector 10 of fig. 2. Referring to fig. 1-4, needleless injector 10 includes a nozzle assembly 1000 and an injector body 2000.

The nozzle assembly 1000 contains a liquid medicine inside. The nozzle assembly 1000 causes the liquid medicine contained therein to be discharged by means of the pressure applied by the syringe body 2000. According to one embodiment, the nozzle assembly 1000 includes a nozzle container 1100, a plunger 1200, and a backflow prevention part 1300. The nozzle assembly 1000 can be disassembled from the injector body 2000.

The nozzle container 1100 provides a space 1110 in which the liquid medicine is contained. The nozzle container 1100 is formed with a discharge hole 1120 through which the chemical liquid contained therein is discharged. The discharge hole 1120 is exposed to the outside of the syringe body 2000 of the nozzle container 1100 and is formed in a region facing a body part to which a drug solution is to be injected. For example, the discharge hole 1120 may be formed in a distal end surface of the nozzle container 1100 opposite to the direction toward the syringe body 2000.

The nozzle container 1100 is provided with an injection hole 1130 into which a chemical solution can be injected from the outside. According to one embodiment, the injection hole 1130 may be formed at a surface of the nozzle container 1100 facing the injector body 2000 in a state of being coupled to the injector body 2000. The injection hole 1130 may be formed on a surface of the nozzle container 1100 opposite to the surface on which the discharge hole 1120 is formed.

According to one embodiment, the space 1110 of the nozzle container 1100 includes a first space 1111 and a second space 1112.

The first space 1111 is a region adjacent to the discharge hole 1120 of the space 1110 of the nozzle container 1100 and communicating with the discharge hole 1120. According to one embodiment, the first space 1111 includes an insertion space 1111a and a flap providing space 1111 b.

The plunger 1200 is inserted into the insertion space 1111 a. The flap providing space 1111b directly communicates with the discharge hole 1120. The flap providing space 1111b is disposed closer to the ejection hole 1120 than the insertion space 1111 a. Between the insertion space 1111a and the flap providing space 1111b, a reverse flow preventing wall 1310 is provided. An anti-backflow hole 1311 is formed in the anti-backflow wall 1310. When the liquid medicine is discharged, the liquid medicine inserted into the space 1111a flows into the valve supply space 1111b through the backflow prevention hole 1311.

The second space 1112 is a region farther from the discharge hole 1120 than the first space 1111 of the space 1110 of the nozzle container 1100.

The diameter of the first space 1111 is smaller than the diameter of the second space 1112 when viewed from the first direction. According to one embodiment, the first direction is a direction from the injector body 2000 towards the nozzle assembly 1000.

According to an embodiment, in a region of the first space 1111 adjacent to the second space 1112, an O-ring (O-ring)1140 may be provided. The inner side of the O-ring 1140 is provided against the side of the plunger 1200. The O-ring 1140 is provided with a waterproof material having elasticity. By providing the O-ring 1140, the chemical liquid can be prevented from moving between the side surface of the plunger 1200 and the inner surface of the first space 1111.

The plunger 1200 applies pressure to the chemical liquid in the nozzle container 1100. The plunger 1200 can be inserted into and removed from the nozzle container 1100 through the surface opposite to the surface on which the discharge hole 1120 is formed. For example, the plunger 1200 may be inserted into and removed from the nozzle container 1100 through the injection hole 1130.

The plunger 1200 may be provided to be detachable from the piston 2100 of the syringe body 2000. The plunger 1200 may be moved by movement of the piston 2100. One end of the plunger 1200 may be exposed to the outside of the nozzle container 1100 through the injection hole 1130 in a state where the plunger 1200 is inserted into the nozzle container 1100. One end of the plunger 1200 and one end of the piston 2100 are engaged with each other so as to be fixed with respect to the first direction and the second direction. The second direction is a direction opposite to the first direction.

The other end 1220 of the plunger 1200 is inserted into and disengaged from the first space 1111 from the second space 1112 in the first and second directions.

According to one embodiment, a medical fluid moving passage 1230 is formed in the plunger 1200. The chemical solution moving passage 1230 is formed to penetrate between one region of the side surface of the plunger 1200 and the other end 1220 of the plunger 1200. The one region on the side surface of the plunger 1200 is located in the second space 1112 when the plunger 1200 is located at the lock position, and is located in the first space 1111 when the plunger 1200 is disposed closer to the discharge hole 1120 than the lock position.

The first space 1111 provides a backflow prevention part 1300. The backflow prevention unit 1300 prevents the liquid chemical, the outside air, and the like from flowing backward from the discharge hole 1120 to the first space 1111. According to one embodiment, the backflow prevention part 1300 opens and closes the backflow prevention hole 1311, so that the backflow may be prevented. For example, the backflow prevention unit 1300 includes a flap member 1320 and a flap elastic member 1330.

The flap member 1320 is provided corresponding to the backflow prevention hole 1311 of the flap providing space 1111 b. The flap member 1320 is moved by the elastic force of the flap elastic member 1330 and the flow of the liquid medicine generated by the movement of the plunger 1200, and is brought into close contact with and spaced from the backflow prevention wall 1310, thereby opening and closing the backflow prevention hole 1311.

The flap elastic member 1330 applies an elastic force to the flap member 1320 in a direction from the discharge hole 1120 toward the backflow prevention hole 1311. The flap elastic member 1330 may be provided as a coil spring having a diameter gradually decreasing from the discharge hole 1120 to the flap member 1320 so as to form a gap through which the medical fluid can be discharged through the discharge hole 1120 in a compressed state.

The syringe body 2000 applies pressure to the nozzle assembly 1000 so that the liquid medicine in the nozzle assembly 1000 is discharged. According to one embodiment, the nozzle assembly 1000 containing the medical fluid therein can be attached to and detached from the syringe body 2000. The syringe body 2000 includes a piston 2100, a piston elastic member 2200, a loading portion 2300, a locking portion 2400, and a housing 2500.

The piston 2100 is connected to the plunger 1200. According to one embodiment, plunger 1200 is removably attached to piston 2100. An inner ball receiving groove 2130 is formed in a side surface of the piston 2100. When the piston 2100 is at the lock position, the lock ball 2420 moves inward and is accommodated in the inner ball accommodation groove 2130.

The piston elastic member 2200 applies an elastic force to the piston in a first direction in which the plunger 1200 applies pressure to the chemical solution in the nozzle container 1100. The piston elastic member 2200 may be provided as a coil spring.

The packing section 2300 moves the piston 2100 to a Locking (packing) position in the second direction. According to one embodiment, the loading portion 2300 includes a handle 2310 and a hooking protrusion 2320.

The handle 2310 extends from a side surface of the housing 2500 so as to be rotatable between a position where it is connected to the housing 2500 and a position where it is separated from the housing 2500, with one end connected to the housing 2500 being the center.

On the side of the handle 2310 facing the housing 2500, according to one embodiment, a hooking protrusion 2320 is provided that extends toward the housing. The hooking protrusion 2320 is centered at one end connected to the side surface of the handle 2310, and the other end can rotate along a plane parallel to the rotation plane of the handle 2310.

According to one embodiment, the area of the side of the housing 2500 corresponding to the handle 2310 is open. In a region of the side of the piston 2100 corresponding to the region of the handle 2310, a hooking member 2110 for hooking the other end of the hooking protrusion 2320 in the second direction is provided.

Accordingly, if the other end of the handle 2310 is moved from a position away from the housing 2500 to an adjacent position, the other end of the hooking protrusion 2320 is thus hooked to the hooking member 2110 and applies a force to the hooking member 2110 in the second direction.

A hooking protrusion elastic member may be provided at the loading part 2300, and the other end thereof applies an elastic force to the hooking protrusion 2320 in a direction away from the handle 2310. Accordingly, the handle 2310 is moved again to a position away from the housing 2500 by the elastic force of the hooking protrusion elastic member after the user moves to the housing 2500 direction in order to position the piston 2100 at the locking position.

The locking portion 2400 locks in the locking position so that the piston 2100 stops, or releases the locking. According to one embodiment, the lock 2400 includes a button 2410, a lock ball 2420, a ball receiving member 2430, and a ball receiving member resilient member 2440.

The button 2410 is provided on the opposite face of the housing 2500 from the face opposite the end of the piston 2100 connected to the plunger 1200.

Locking ball 2420 is provided in a manner to be rotatable at a location within housing 2500. Locking ball 2420 may be provided in plurality in such a manner as to surround the side surface adjacent to the other end of piston 2100. Locking ball 2420 is provided in a fixed manner relative to the first and second directions. Lock ball 2420 is provided in a movable manner in a direction perpendicular to the first and second directions.

The ball receiving member 2430 is moved in a first direction by means of the button 2410. An outer ball receiving groove 2431 is formed in the ball receiving member 2430. Outer ball receiving groove 2431 provides a space in which lock ball 2420 can move outward when the position of ball receiving member 2430 is at a position corresponding to lock ball 2420.

The ball receiving member elastic member 2440 applies an elastic force to the ball receiving member 2430 in the second direction. The ball receiving member elastic member 2440 may be provided as a coil spring.

The housing 2500 has a space inside to provide the piston 2100. According to one embodiment, the piston 2100 of the housing 2500 has an open face at one end. A nozzle assembly coupling hole is formed at a side of the housing 2500 so that the nozzle assembly 1000 can be inserted into the housing 2500.

The nozzle block coupling hole is formed to open from a surface of the piston 2100 facing one end to a region corresponding to one end of the piston 2100.

An opening/closing member 2520 for opening and closing the nozzle block coupling hole may be provided in the nozzle block coupling hole. According to one embodiment, the opening/closing member 2520 is connected to the housing 2500 at one end thereof facing the second direction by means of a hinge 2521, and rotates at the other end thereof between a position facing the first direction and a position spaced apart from the housing, thereby opening and closing the nozzle assembly coupling hole.

A method of injecting a drug solution using the needle-less injector 10 of fig. 1 will be described.

Referring to fig. 2 to 4, the nozzle assembly 1000 in a state where the liquid medicine has been supplied to the space of the nozzle container 1100 is combined with the syringe body 2000. According to one embodiment, the nozzle assembly 1000 is inserted into the housing 2500 through the nozzle assembly coupling hole in a state where the opening and closing member 2520 is opened, such that one end of the plunger 1200 protruding toward the injection hole 1130 is coupled to one end of the piston 2100, and is coupled to the syringe body 2000. At this time, the piston 2100 is unlocked. Therefore, the plunger 1200 is inserted into the insertion space 1111a to the maximum. Further, the lock ball 2420 is inserted into the outer ball receiving groove 2431, and the inner ball receiving groove 2130 is moved in the first direction from the position facing the lock ball 2420.

Fig. 5 is a side sectional view of the piston 2100 of the needle free injector 10 of fig. 1 moved to a locked position. Fig. 6 is a side sectional view of the area adjacent the discharge orifice 1120 of the needle free injector 10 of fig. 5. Referring to fig. 5 and 6, after the process of fig. 2 is performed, if a user applies a force to the handle 2310 to move the handle 2310 in the direction of the housing 2500, the piston 2100 is moved to the locking position in the second direction. At this time, the plunger 1200 also moves in the second direction together with the piston 2100, and at the same time, the space between the backflow preventing wall 1310 inserted into the space 1111a and the other end of the piston 2100 is vacuumed before the hole formed in the side surface of the piston 2100 of the chemical solution moving passage 1230 is exposed to the second space 1112. The user can apply a force to the handle 2310 toward the side of the housing 2500 by simultaneously grasping the handle 2310 and the outer circumference of the side of the housing 2500 with the hand. At this time, in a state where the handle 2310 is completely moved toward the housing 2500, the end of the auxiliary protrusion protruding from one end of the hooking protrusion 2320 in the vertical direction protrudes outward from the region corresponding to the auxiliary protrusion on the side surface of the housing, and rotates along the inclined surface of the inclined protrusion having the inclined surface inclined in the first direction as the side surface is outward, and thereby the hooking protrusion 2320 rotates, and the other end of the hooking protrusion 2320 is separated from the hooking member 2110.

Fig. 7 is a side sectional view of the piston 2100 of the needle free injector 10 of fig. 1 in a locked position. Fig. 8 is a side sectional view of the area adjacent the discharge orifice 1120 of the needle free injector 10 of fig. 7. Fig. 9 is a side sectional view of the area adjacent the other end of the piston 2100 of the needle free injector 10 of fig. 7. Referring to fig. 7-9, upon completion of the process of fig. 5 and 6, inner ball receiving groove 2130 of piston 2100 is positioned to correspond with lock ball 2420. Accordingly, the locking balls 2420 are received in the inner ball receiving groove 2130, and the locking balls 2420 of the ball receiving member 2430 are prevented from moving to the inner ball receiving groove 2130, so that the ball receiving member 2430 moves in the second direction by the elastic force of the ball receiving member elastic member 2440. Therefore, the lock ball 2420 is prevented from moving outward by the region of the ball receiving member 2430 on the first direction side of the outer ball receiving groove 2431, and the piston 2100 is stopped at the lock position by the lock ball 2420 received in the inner ball receiving groove 2130. At this time, the hole formed outside the plunger 1200 of the chemical solution moving passage 1230 is exposed to the second space 1112, and the chemical solution in the second space 1112 flows into the insertion space 1111a in a vacuum state through the chemical solution moving passage 1230.

Fig. 10 is a side sectional view of the needleless syringe 10 of fig. 1 in a drug solution discharge state. Fig. 11 is a side sectional view of a region adjacent to the discharge hole 1120 in the state in which the medical fluid is being discharged in the needleless syringe 10 of fig. 1. Fig. 12 is a side sectional view of the needleless injector 10 of fig. 10. If referring to fig. 10 to 12, in a state where the user holds the needle-less injector 10 by hand as described above, if the button 2410 is pressed by a thumb or the like, the ball receiving member 2430 moves in the first direction until the outer ball receiving groove 2431 reaches a position corresponding to the locking ball 2420. Therefore, the locking ball 2420 once accommodated in the inner ball accommodation groove 2130 moves to the outer ball accommodation groove 2431, and the locking ball 2420 is inserted into the inner ball accommodation groove 2130, so that the piston 2100 once locked moves in the second direction by the elastic force of the piston elastic member 2200. At this time, the plunger 1200 connected to the piston 2100 is moved in the second direction by the movement of the piston 2100, and the medical fluid contained in the insertion space 1111a is discharged through the discharge hole 1120. At this time, the flap member 1320 is moved in the discharge hole direction by the pressure of the liquid medicine applied by the piston 2100, and the liquid medicine passes between the flap member 1320 and the backflow prevention hole 1311 and is delivered to the discharge hole.

Fig. 13 is a side cross-sectional view of the needle-less injector 10 of fig. 1 showing a relaxed force applied to the handle 2310 after discharge of the medical fluid. Referring to fig. 13, if the user releases the hand that has been holding the needle-less injector 10 after the liquid medicine is discharged, the hooking protrusion 2320 is rotated by the elastic force of the elastic member of the hooking protrusion to rotate the handle 2310 in a direction away from the housing 2500, so that the needle-less injector 10 is brought back into the same state as that of fig. 1, and the above-described method is repeated, thereby allowing the liquid medicine to be injected again and again in a predetermined amount. In particular, as described above, in the needle-less syringe 10 according to the embodiment of the present invention, only the chemical liquid flowing into the insertion space 1111a out of the chemical liquid stored in the nozzle container 1100 is discharged at one discharge, and the nozzle unit 1000 storing the chemical liquid is coupled to the syringe main body 2000, so that the chemical liquid can be continuously injected several times at a predetermined amount.

A method of injecting a medical fluid into the nozzle assembly 1000 of the needle-less injector 10 in accordance with one embodiment of the present invention is described below.

Fig. 14 to 16 are views sequentially showing an example of a method of injecting a chemical solution into the nozzle assembly 1000 of fig. 1. Referring to fig. 14 to 16, a chemical liquid is injected into the empty nozzle assembly 1000 through the injection hole 1130 by using the pipette 30 or the like.

Then, the plunger 1200 is inserted into the nozzle assembly 1000 into which the chemical solution is injected from the other end 1220 through the injection hole 1130.

According to one embodiment, a grip 1240 may be provided at one end of the plunger 1200. The user can move the plunger 1200 easily while holding the grip 1240. The grip 1240 is removed from the plunger 1200 after the plunger 1200 is inserted into the nozzle container 1100. A cut-off region that is recessed inward in the outer circumferential direction of the side surface of the plunger 1200 may be formed in a region of the grip portion 1240 adjacent to the side surface of the plunger 1200. Therefore, when force is applied to the grip 1240 and the grip 1240 is removed from the plunger 1200, the cutoff region is cut off, and the grip 1240 can be easily removed.

As described above, the needleless injector 10 of one embodiment of the present invention can continuously inject a predetermined amount of liquid medicine a plurality of times by replacing the nozzle assembly 1000 once. In addition, the needleless injector 10 of one embodiment of the present invention is used in place of the nozzle assembly 1000 containing a medical fluid, thereby being sanitary and reducing the risk of infection.

The foregoing detailed description is illustrative of the invention. The foregoing shows and describes preferred embodiments of the present invention, which can be used in many different combinations, permutations and environments. That is, the present invention may be modified or revised within the scope equivalent to the concept of the invention disclosed in the present specification, the scope equivalent to the foregoing disclosure, and/or the scope of the art or knowledge in the industry. The foregoing embodiments have described the best mode required for embodying the technical idea of the present invention, and various modifications required for specific application fields and uses of the present invention can be made. Therefore, the above summary of the present invention is not intended to limit the present invention to the disclosed embodiments. In addition, the appended claims should be construed to include other embodiments as well.

Claims

1. A needleless injector, comprising:

a nozzle unit which contains a chemical liquid therein and discharges the chemical liquid; and

a syringe body that applies pressure to the nozzle assembly to discharge the liquid medicine;

the nozzle assembly includes:

a nozzle container which provides a space for containing a chemical liquid therein and has a discharge hole for discharging the chemical liquid; and

a plunger for applying pressure to the chemical liquid in the nozzle container;

the syringe body includes:

a piston connected to the plunger;

a piston elastic member that applies elastic force to the piston in a first direction in which the plunger applies pressure to the drug solution;

a charging portion that moves the piston in a second direction opposite to the first direction to a lock position; and

a locking portion that locks at the locking position to stop the piston or releases the locking.

2. The needle free injector of claim 1,

the nozzle assembly is removable from the injector body.

3. The needle free injector of claim 1,

the nozzle container is provided with an injection hole into which a chemical solution can be injected from the outside.

4. The needle free injector of claim 3,

the plunger is injected into and separated from the nozzle container through the injection hole.

5. The needle free injector of claim 4,

one end of the plunger is exposed to the outside of the nozzle container through the injection hole,

one end of the plunger and one end of the piston engage each other so as to be fixed with respect to the first direction and the second direction.

6. The needle free injector of claim 1,

the space of the nozzle container includes a first space adjacent to the discharge hole and communicating with the discharge hole and a second space farther from the discharge hole than the first space,

a diameter of the first space is smaller than a diameter of the second space when viewed from the first direction,

the other end of the plunger is inserted into the first space from the second space.

7. The needle free injector of claim 6,

the plunger is formed with a chemical solution moving passage which passes through one region of a side surface and the other end of the plunger,

the first space is provided with a backflow prevention part for preventing the backflow of the fluid from the discharge hole to the first space,

the one region of the side surface is located in the second space when the plunger is located at the lock position, and is located in the first space when the plunger is located closer to the discharge hole than the lock position.

8. A nozzle unit which contains a chemical liquid therein, is attachable to and detachable from a syringe body, and discharges the chemical liquid by pressure applied from the syringe body, the nozzle unit comprising:

a nozzle container which is provided with a space for containing a liquid medicine therein and is provided with a discharge hole for discharging the liquid medicine; and

a plunger for applying pressure to the chemical liquid in the nozzle container;

the plunger is attachable to and detachable from the piston of the syringe body, and is moved by the movement of the piston.

9. The nozzle assembly of claim 8,

the nozzle container is formed with an injection hole into which a chemical solution can be injected from the outside.

10. The nozzle assembly of claim 8,

the plunger is inserted into and removed from the nozzle container through a surface of the nozzle container opposite to the surface on which the discharge hole is formed,

one end of the plunger is exposed to the outside of the nozzle container in a state where the plunger is inserted into the nozzle container,

a grip portion that can be gripped by a user is provided at the one end of the plunger,

the grip portion is removed from the plunger after the plunger is inserted into the nozzle container.

11. The nozzle assembly of claim 8,

12. The nozzle assembly of claim 9,

the plunger is provided with a chemical solution moving passage which penetrates through one region of a side surface and the other end of the plunger,

the one region of the side surface is located in the second space when the plunger is located at a lock position, and is located in the first space when the plunger is located closer to the discharge hole than the lock position.

13. The nozzle assembly of claim 12,

the first space includes:

an insertion space into which the plunger is inserted;

a flap providing space which communicates with the discharge hole and is adjacent to the discharge hole than the insertion space;

a backflow prevention wall in which a backflow prevention hole opened and closed by the backflow prevention unit is formed is provided between the insertion space and the flap providing space,

the backflow prevention unit includes:

a flap member provided at a position corresponding to the backflow preventing hole of the flap providing space;

a flap elastic member that applies an elastic force to the flap member in a direction from the discharge hole toward the backflow prevention hole.

14. A syringe body to which a nozzle unit for containing a medical fluid therein is attached and detached, and which applies pressure to the nozzle unit to discharge the medical fluid, the syringe body comprising:

a piston for attaching and detaching a plunger of the nozzle assembly;

a charging section that moves the piston in a second direction opposite to the first direction to a lock position;

a lock portion that locks at the lock position to stop the piston or releases the lock; and

a housing formed with a space in which the piston is provided.

15. Syringe body according to claim 14,

the housing has a surface that faces one end of the piston and is open,

a nozzle assembly coupling hole opened from a surface of the housing facing the one end of the piston to a region corresponding to the one end of the piston is formed at a side surface of the housing so that the nozzle assembly can be inserted,

an opening/closing member for opening and closing the nozzle block coupling hole is provided in the nozzle block coupling hole.