JP2008093331A - Needle-less syringe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a needle-less syringe capable of performing injecting in an optional direction including a syringe axial direction. <P>SOLUTION: The needle-less syringe adopts a compression spring or gas pressure as the power source of injecting a liquid medicine. A nozzle 1 has a smooth tip outer shape without a projection/recession like a spherical shape, a length to be fitted to the size of a body shape in an injection object and the injection place, and a smooth cylindrical body part. The nozzle 1, where a spray hole for spraying the liquid medicine in the center axial direction of the syringe and spray holes for spraying the liquid medicine from optional positions on the side surface are punctured, is mounted on the front cylinder 12 of a syringe body. Thus, the syringe is safely and easily abutted onto the small injection place and the liquid medicine is efficiently injected. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a needleless syringe that performs injection by jetting a certain amount of chemical solution sucked from an injection hole of a nozzle or a chemical solution filled in a nozzle in advance.

  A needleless syringe is designed to jet a chemical solution in a nozzle that has been inhaled from the injection port at the tip of the needle, or a chemical solution that has been filled in the nozzle in advance, by jetting it from the injection hole. A syringe for injection). In other words, since injection with a needleless syringe does not use an injection needle at the time of injection, there are advantages such as prevention of needle stick accidents and use for patients with advanced phobias. For example, diabetics themselves self-inject insulin on a daily basis It is also used in some cases. In addition, it has been announced that it is used for gene drugs and has higher medicinal properties than syringes with needles.

  As such a needleless syringe, a system in which a spring is compressed, and a piston in the nozzle is advanced at a high speed by using this compression force as a power source to jet a drug solution is often used. FIG. 7 is a side sectional view showing a configuration example of a conventional needleless syringe. As shown in the figure, the needleless syringe includes a cylindrical body 15A formed by screwing a front cylinder 12 and a rear cylinder 14 having both end surfaces open at a screw portion 13, and a nozzle 11 screwed to the tip portion thereof. A latch release button 16 inserted in the rear end portion so as to be movable in the axial direction, a rod 18 in the hollow portion of the cylindrical body 15A and connected to the piston 17 so as to be movable in the axial direction, and a latch groove to be described later 21, a rod driving mechanism 19 including a fixing ring 22, a latch ball 23, a small hole 24, and a compression spring 25.

  A flange ring 20 is integrally coupled to the front portion of the rod 18, and a latch groove 21 is provided on the rear circumferential portion. A fixing ring 22 is fixed to the rear side of the rear cylinder 14, and a compression spring 25 having a rod inserted is interposed between the flange ring 20 and the fixing ring 22. A plurality of small holes 24 are formed in the rear circumferential portion of the fixing ring 22, and latch balls 23 are fitted therein. A compression spring 26 is interposed between the fixing ring 22 and the latch release button 16 through the rod 18. Due to the repulsive force of the compression spring 26, a force in the backward direction is always applied to the latch release button 16. It is energized.

  In order to inhale the drug solution with the needleless syringe, the front cylinder 12 is held firmly, the tip of the nozzle 11 is applied to the suction port of the drug solution vial (not shown), and the rear cylinder 14 is rotated backward to rotate. A required amount is sucked into the space between the nozzle 11 and the piston 17 while looking at the scale numbers (not shown) on the display window 27. Then, when the nozzle 11 of the needleless syringe that has inhaled the medicinal solution by the above method is applied to the injection site of the patient and the latch release button 16 is pressed, the latch ball 23 jumps out of the latch groove 21, the rod 18 becomes free and the compression spring 25 Moves forward at high speed in response to repulsive force. The chemical liquid in the space chamber is pressed at a high pressure by the piston 17 and jetted at high speed from the injection hole 11a to perform subcutaneous injection (see Patent Document 1).

JP 2003-79725 A

The conventional needleless syringe is configured as described above, but for the purpose of subcutaneous injection, the outer shape of the syringe and its injection hole is designed to firmly touch the outer skin such as the arm or abdomen. There is a problem that it can be injected only in the axial direction. For this reason, injection into sites other than the outer skin, for example, efficient injection into narrow injection sites such as in the oral cavity, nasal cavity, and vagina has been difficult or impossible.
The present invention has been made in view of such circumstances, and an object thereof is to provide a needleless syringe capable of efficient injection into a narrow injection site such as in the oral cavity, nasal cavity, and vagina. To do.

In order to achieve the above object, the needleless syringe of the present invention jets a liquid medicine from the injection hole by pressing the liquid medicine in the nozzle sucked from the injection hole or the liquid medicine previously filled in the nozzle with a piston. In a needleless syringe that performs hypodermic injection, the nozzle has a cylindrical shape with an injection hole formed in a direction different from the axial direction of the syringe.
Further, the nozzle of the needleless syringe of the present invention has a cylindrical shape in which a plurality of injection holes are bored in the direction perpendicular to the syringe axis and along the syringe axis direction.
Furthermore, the needleless syringe of the present invention is a needleless syringe configured as described above, which is equipped with a nozzle having a smooth tip outer shape without irregularities, a length suitable for the injection site, and a smooth cylindrical portion. is there.
By using the above-described configuration, the needleless syringe of the present invention can enable efficient injection to a narrow injection site such as in the oral cavity, nasal cavity, and vagina.

  Since the needleless syringe of the present invention has an injection hole directed in an arbitrary direction other than the injection hole in the syringe axial direction, it is safe in a narrow place other than the outer skin, for example, an injection site such as in the oral cavity, nasal cavity, and vagina. And injection can be performed easily. Moreover, since a plurality of injection holes are provided in an arbitrary direction, the number of injections can be reduced.

  An embodiment of a needleless syringe according to the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of a needleless syringe according to an embodiment of the present invention, and FIG. 2 is a side sectional view (A) and a AA sectional view (B) of a nozzle 1 used in the needleless syringe. Since this needleless syringe uses the same configuration as that of the conventional needleless syringe shown in FIG. 7 except for the tip including the nozzle 1, these components are denoted by the same reference numerals.

  As shown in FIG. 1, this needleless syringe is fitted with a gasket 2 for preventing chemical leakage at the tip opening of a cylinder block 3A embedded by integral molding, and the nozzle 1 is screwed onto the tip of the cylinder block 3A. The cylinder 15 formed by screwing the front cylinder 3 and the rear cylinder 14 attached to each other at the threaded portion 13 and the piston 4 which is in the hollow portion of the cylinder 15 and is movable in the axial direction are connected. A rod 18, a rod drive mechanism 19 that latches the rod 18 in the rear cylinder 14, compresses the compression spring 25 and biases forward force, and releases the latch of the rod drive mechanism 19 to release the latch in the cylinder block 3A. In order to move the piston 4 forward at high speed, it is composed of a latch release button 16 or the like inserted in the rear end of the rear cylinder 14 so as to be movable in the axial direction.

  As shown in FIG. 2, the nozzle 1 has a cylindrical body portion 1c in which a tip end portion is spherical and a rear end portion is expanded in the circumferential direction, and a body portion that connects them is formed in a cylindrical shape. Manufactured using a metal material with high hardness. The nozzle 1 is provided with an injection hole 1a for injecting the chemical liquid in the axial direction of the syringe and an injection hole 1b for injecting the chemical liquid from an arbitrary position on the side surface. The piston 4 is formed of a metal or resin molded member that is in close contact with the inner wall of the nozzle 1 during injection. Since this needleless syringe is equipped with a cylindrical nozzle 1 having a spherical tip and a circular cross section, it can be easily inserted into a narrow injection site such as in the oral cavity, nasal cavity, or vagina of a human or animal for injection. It can be performed.

  In order to perform injection using the needleless syringe in the state shown in FIG. 1, first, the rear cylinder 14 is rotated clockwise to advance, the latch ball 23 is fitted in the latch groove 21, and the rod 18 is latched in the rear cylinder 14. Then, with the nozzle 1 immersed in the chemical solution stored in the container, the rear cylinder 14 is rotated counterclockwise to retract the chemical solution M in the space formed between the nozzle 1 and the piston 4 as shown in FIG. Inhale. For example, when the injection is performed in the inner part of the oral cavity and the upper side thereof, as shown in FIG. 4, the injection hole 1b of the nozzle 1 is inserted upward into the injection site, and the latch release button 16 is applied to the injection site. Press. As a result, the latch of the rod 18 is released and the chemical liquid is pressed by the piston 4, and the chemical liquid is jet-injected from the injection hole 1a at the tip and the injection hole 1b at the side surface, and is injected into the vicinity of the inner part of the oral cavity.

  FIG. 5 shows a sectional view of a nozzle 5 as another embodiment of the nozzle 1. This nozzle 5 is provided with an injection hole 5a for injecting a chemical solution in the axial direction of the syringe and a plurality of injection holes at arbitrary positions on the side surface, and the chemical solution is applied in a direction perpendicular to the syringe axis at intervals of 90 degrees. Injecting holes 5b, 5c, 5d, and 5e are provided. These injection holes 5b to 5e are selected and processed according to the target injection site. The nozzle 5 can efficiently inject a large amount of chemical solution by one injection compared to the case where the nozzle 1 is used, and can reduce the number of injections.

  Further, as another embodiment of the nozzle 1, FIG. 6 shows a sectional view of the nozzle 6 and FIG. This nozzle 6 has a plurality of injection holes 6b arranged in parallel at an arbitrary position in a direction perpendicular to the syringe axis. The needleless syringe equipped with this nozzle 6 can inject a medicinal solution into a necessary injection site by one injection when the injection site spreads along, for example, the side wall in the oral cavity, and can perform an efficient injection.

  The nozzles 1, 5, and 6 are all preferably provided with a smooth outer shape that has no irregularities such as a spherical tip, a length that fits the injection site, and a smooth cylindrical portion. The thickness and length are determined by the injection object and the injection site. For example, nozzles used for animals larger than humans, such as pigs, cows, and horses, have larger thicknesses and lengths than human nozzles, and smaller mice and rats are used.

  The present needleless syringe is not limited to the configuration shown in the above embodiment. For example, as shown in FIG. 1, the needleless syringe uses the compression force of the compression spring 25 as a power source for the piston starting force, but the gas pressure may be used as the power source. Alternatively, the nozzle 1 and the cylinder block 3A may be provided with attachment holes and fixed with bolts and nuts. It is also possible to fix the bolt by cutting a fool hole on one side and a female screw on the other side. Alternatively, the nozzle 1 and the front cylinder 3 may be integrated. If it is detachable, the syringe body can be injected multiple times and is economical, and if it is integrated, it becomes a disposable needleless syringe and a hygienic syringe.

  The present invention relates to a needleless syringe that performs injection by jetting a certain amount of chemical solution inhaled from an injection hole of a nozzle or a chemical solution previously filled in the nozzle, particularly a needle that is injected into a narrow injection site such as in the oral cavity. Available for syringeless.

It is side surface sectional drawing which shows the structure of the needleless syringe by the Example of this invention. It is side surface sectional drawing (A) of the nozzle 1 concerning an Example, and its AA sectional drawing (B). It is side surface sectional drawing of the front-end | tip part of the needleless syringe in the state which inhaled the chemical | medical solution. It is a figure which shows the state at the time of performing intraoral injection using the needleless syringe by an Example. It is side surface sectional drawing (A) of the other nozzle 5 concerning an Example, and its AA sectional drawing (B). It is side surface sectional drawing (A) of the other nozzle 6 concerning an Example, and its AA sectional drawing (B). It is side surface sectional drawing which shows the structure of the conventional needleless syringe.

Explanation of symbols

1 Nozzle 1a, 1b, 1c Injection hole 2 Gasket 3 Front cylinder 3A Cylinder block 4 Piston 5 Nozzle 5a, 5b, 5c, 5d, 5e Injection hole 6 Nozzle 6b Injection hole 11 Nozzle 11a Injection hole 12 Front cylinder 13 Screw part 14 Rear Side cylinder 15 Cylinder 15A Cylinder 16 Latch release button 17 Piston 18 Rod
19 Rod drive mechanism 20 Flange ring 21 Latch groove 22 Fixing ring 23 Latch ball 24 Small hole 25 Compression spring 26 Compression spring 27 Chemical quantity display window

Claims (3)

In a needleless syringe that performs subcutaneous injection by pressing a drug solution in a nozzle sucked from an injection hole or a drug solution previously filled in the nozzle by a piston and jetting the drug solution from the injection hole, the nozzle is in the direction of the syringe axis. A needleless syringe characterized by having a cylindrical shape with injection holes drilled in different directions. In a needleless syringe that performs subcutaneous injection by pressing a drug solution in a nozzle sucked from an injection hole or a drug solution previously filled in the nozzle with a piston and jetting the drug solution from the injection hole, the nozzle is connected to the syringe shaft. A needleless syringe characterized by having a cylindrical shape in which a plurality of injection holes are bored in the vertical direction and along the syringe axial direction. 3. The needleless syringe according to claim 1, wherein the nozzle has a smooth tip outer shape having no irregularities, a length suitable for the injection site, and a smooth cylindrical portion.

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