JP2000093513A - Needleless syringe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the error of using a disposable nozzle beyond its limit of use due to the forgetting of the limit of use in a needleless syringe using such a nozzle. SOLUTION: The error of using a disposable nozzle 2 beyond its limit of use is prevented by designing life seal 2b showing replacement time to be naturally recognized when the mark 2c of the disposable nozzle 2 and the life seal 2b are bonded together with their centers aligned and a mark 8c and the mark 2c are aligned in order for a chemical adapter 8 storing a chemical vial 7 to be coupled to the disposable nozzle 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needleless injector for performing subcutaneous injection by jetting an inhaled drug solution, and more particularly to a needleless injector using a disposable nozzle.

[0002]

2. Description of the Related Art A needleless syringe is a syringe for injecting a drug solution into a patient's subcutaneous skin by injecting a predetermined amount of a drug solution from a nozzle at a tip portion thereof and jetting the drug solution again from the nozzle. In other words, injection with a needleless syringe is a needleless injection that does not use a needle at the time of subcutaneous injection. It is also used when insulin is self-injected.

[0003] The nozzles of such needleless syringes are classified into a continuous use type and a disposable type. However, since the continuous use type is used for a long time, hygiene management is particularly difficult. Things are heavily used. Although this disposable type nozzle has a fixed expiration date, the expiration date is only described in the manual, and the actual management is performed by the patient who uses it. The replacement time was recognized by using a method such as keeping a log in a diary, and replacing it with a new nozzle.

[0004]

The conventional needleless syringe is constructed as described above. However, when a disposable nozzle is used, the management of the expiration date relies on the memory and the contents of the treatment diary. Even if the nozzle has reached the expiration date, there is a risk of using it unnoticed, resulting in the risk that the nozzle part may be damaged and lead to a serious accident,
There was a serious problem of lack of safety as a medical device.

[0005] The present invention has been made in view of such circumstances, and an object of the present invention is to provide a needleless syringe that can always be used with the expiration date of a disposable nozzle.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a needleless syringe for jetting a predetermined amount of a chemical solution inhaled from an injection port of a nozzle at a tip portion of the nozzle and subcutaneously injecting the jetted liquid from the injection port. , Wherein a disposable nozzle indicating an expiration date is used as the nozzle.

[0007] The needleless syringe of the present invention is configured as described above. Since the expiration date of the nozzle can be inevitably checked every time the patient injects himself, the nozzle can be replaced without exceeding the expiration date. Can be used.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to examples. FIG. 1 is a cross-sectional view of a needleless syringe using a disposable nozzle (hereinafter, abbreviated as a nozzle) of the present invention, FIG. 2 is a cross-sectional view showing a state where the needleless syringe is connected to a drug solution vial, and FIG. It is a top view which shows the state before a chemical | medical solution vial is couple | bonded with a syringeless syringe.

As shown in FIG. 1, the needleless syringe 1 has a front cylinder 4 and a rear cylinder 5 each having an open end face.
A cylindrical body 6 made of metal or hard resin, which is screwed together with a nozzle 2 having a jet port 2a at the tip and a piston 21 inside, The piston 2 is located in the hollow portion of the body 6 so as to be movable in the axial direction.
1 comprises a rod 3 connected thereto and a driving mechanism thereof.

[0010] The piston 21 has an O
The ring 21b is wound around and the T-shaped connecting portion 21
c is connected to the rod 3 by fitting it into the long hole 3 a of the rod 3. Further, the rod 3 has a flange ring 31 integrally joined at a position about 1/4 from the tip thereof, and a plurality of latch holes 35 on the rear circumference thereof.
A recess 36 is provided at the rear end. A guide pipe 32 with a flange 33 is fitted in the axial direction of the rear part of the rod 3, and a compression spring 34 is disposed between the flange ring 31 and the flange 33 through the rod 3.
As a result, the rod 3 is given a biasing force in the forward direction.

On the other hand, the projection 51 on the circumference in the rear cylinder 5
A fixing ring 52 is fixedly provided at the rear, and a latch ball 53 is fitted into a plurality of small holes 54 provided on the circumference of the rear part. A slide ring 57 is inserted behind the fixing ring 52 so as to be movable in the axial direction, and a latch release button 56 is fitted to the rear end of the slide ring 57 so as to be movable in the axial direction. A movable small piece 58 is fitted to the rear end of the fixed ring 52 so as to be movable in the axial direction. A compression spring 55 is interposed between the movable small piece 58 and the slide ring 57,
The slide ring 57 is constantly urged in the backward direction by the compression spring 55.

As means for supplying a chemical solution from the chemical vial 7 to the needleless syringe 1, as shown in FIG. 2, a chemical solution adapter 8 for screwing the upper case 8a and the lower case 8b to accommodate the chemical vial 7, A suction needle 9 inserted into a rubber stopper (not shown) of the chemical vial 7 is used. The liquid medicine adapter 8 is inserted into the cylindrical recess of the nozzle 2 of the needleless syringe 1 and rotated to fix the liquid medicine adapter 8 to the needleless syringe 1.

The inhalation and injection of a drug solution by the needleless syringe 1 constructed as shown in FIG. 2 are performed as follows. The entire needleless syringe 1 is in the state shown in FIG. 1. When the rear cylinder 5 is rotated in the forward direction, the fixed ring 52 advances while the compression spring 34 is compressed, and the movable small piece 58 is inserted into the recess 36. Then, the advancement stops, but the fixing ring 52 advances, and the latch ball 53 enters the recess 36 and is held down by the inner surface of the tip of the slide ring 57 at the same time. Further, when the piston 21 is pushed to the stop position, and then the rear cylinder 5 is rotated in the retreating direction, the piston 21 and the rod 3
Moves backward in a state in which the compression spring 34 remains compressed, and a low-pressure space (chemical solution chamber) is formed between the inner surface of the distal end portion of the nozzle 2 and the conical surface of the threaded body 21a of the piston 21. The drug solution in the drug solution vial 7 is taken into the drug solution chamber through the suction needle 9 and the ejection port 2a of the nozzle 2 which is in close contact with the suction needle 9.

Next, in order to obtain a required amount of the chemical solution,
After the front end of the rear cylinder 5 is aligned with the scale (not shown) on the surface of the front cylinder 4 to take in a predetermined amount of the liquid medicine, the liquid medicine adapter 8 is removed, the nozzle 2 is applied to the injection position of the patient, and the latch release button 56 is pressed. When pressed, the inner surface at the tip of the slide ring 57 rides over the latch ball 53 and the latch hole 3
5, the latch ball 53 jumps out, and the rod 3 becomes free and moves forward at high speed. At this time, the piston 21
Does not decelerate the initial speed due to the play of the long hole, but gains momentum to move the piston 21 forward. The medicinal liquid in the medicinal liquid chamber is compressed at a high pressure by the piston 21, and is ejected at high speed from the injection port 2a to perform subcutaneous injection.

In order to prevent the nozzle 2 from being used after its expiration date, for example, as shown in FIG. 3, a replaceable life seal 2b in which "replacement is every Saturday" is aligned with the center of the mark 2c. Affixed to The mark 2c is used when a drug solution is sucked into the needleless syringe 1 before injection, and the drug solution adapter 8 is inserted into the nozzle 2 by aligning the mark 8c of the drug solution adapter 8 with the same line as the mark 2c. By rotating the liquid medicine adapter 8 clockwise until the line 8d becomes the same line as the mark 2c, the liquid medicine adapter 8
Is fixed to the nozzle 2. During this operation, the user of the needleless syringe recognizes the expiration date of the nozzle 2 for each injection, so that replacement with a new nozzle 2 is performed without exceeding the expiration date.

The time for replacing the nozzle 2 is as follows.
It's normal pace to change about once a week,
The date or day of the week is suitable as the expiration date (lifetime) described on the lifespan seal 2b. The present invention, as described above,
A lifetime seal 2b is attached to the upper surface of the disposable nozzle 2,
When the chemical liquid adapter 8 is attached to the needleless syringe, the user can always recognize it, and various modifications other than the embodiment can be used for the coupling method between the nozzle 2 and the needleless syringe main body. . For example, a method of inserting the nozzle 2 into the needleless syringe, rotating the nozzle 2 by a fixed angle, and fitting the nozzle 2 together can be used.

[0017]

The needleless syringe according to the present invention is constructed as described above, and the nozzle replacement time is always recognized in the operation stage before injecting the drug solution, so that the nozzle can be used without depending on the memory or the treatment diary. Replacement mistakes can be prevented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a needleless syringe using a disposable nozzle according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state where the needleless syringe is connected to a drug solution vial.

FIG. 3 is a plan view showing a state before a drug solution vial is connected to the needleless syringe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Needleless syringe 2 ... Nozzle 2a ... Injection port 2b ... Lifetime seal 2c ... Mark 3 ... Rod 3a ... Long hole 4 ... Front cylinder 5 ... Rear cylinder 6 ・ ・ ・ Cylindrical body 7 ・ ・ ・ Chemical vial 8 ・ ・ ・ Chemical liquid adapter 8a ・ ・ ・ Case upper 8b ・ ・ ・ Case lower 9 ・ ・ ・ Suction needle 21 ・ ・ ・ Piston 21a ・ ・ ・ Barring Body 21b ... O-ring 21c ... T-shaped connecting part 31 ... flange ring 32 ... guide pipe 33 ... flange 34, 55 ... compression spring 36 ... recess 42, 43 ...・ Screw part 51 ・ ・ ・ Protrusion part 52 ・ ・ ・ Fixing ring 53 ・ ・ ・ Latch ball 54 ・ ・ ・ Small hole 56 ・ ・ ・ Latch release button 57 ・ ・ ・ Slide ring 58 ・ ・ ・ Movable small piece

Claims (1)

[Claims] In a needleless syringe for subcutaneously injecting a predetermined amount of a drug solution from a nozzle at a tip end portion through a nozzle and jetting the liquid from the nozzle, a disposable nozzle indicating an expiration date is used as the nozzle. A needleless syringe.