JP2001212237A - Neeldeless syringe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a needleless syringe allowing a user to easily adjust the scale of the quantity of medicine liquid to be sucked. SOLUTION: A click mechanism is constitute of a projection 2d formed in a front barrel 2 having a medicine liquid quantity set value display window 2c and a groove 3b formed in a rear barrel 3 around which a numeral seal 10 is wound. The click mechanism prevents the excessive scale adjustment by the click feeling and the difference of rotation force generated from the rotation of the rear barrel 3, so that the secure scale adjustment can be achieved easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needleless syringe for performing subcutaneous injection by jetting a predetermined amount of a chemical solution inhaled from an injection hole of a nozzle.

[0002]

2. Description of the Related Art A needleless syringe is a syringe that injects a drug solution into a patient's subcutaneous skin by injecting a predetermined amount of a drug solution from a nozzle orifice of a nozzle at the tip and jetting the drug solution again from the nozzle orifice. In other words, injection using a needleless syringe does not use a needle at the time of subcutaneous injection, and thus has the advantages of not causing pain, leaving no injection mark, and having no injection mistakes. It is also used for injection.

Conventionally, a method as shown in FIG. 6 has been used as a method for taking a drug solution from a drug solution vial into such a needleless syringe. That is, the needleless syringe 21 has a nozzle 25 at a tip end of a cylindrical body 24 in which a rear cylinder 23 is screwed to a front cylinder 22, and a piston rod 28 connected to a piston 27 having a seal member 26 mounted inside the cylinder 25. , A display window 22c provided in the front cylinder 22 and a number seal 10 which displays a group of numbers in a helical arrangement as shown in FIG. ing. The piston rod 28 is connected to a driving mechanism (not shown) in the cylindrical body 24 and is disposed so as to be movable in the axial direction.

[0004] After the rear cylinder 23 of the needleless syringe 21 is rotated and advanced to make the number of the display window 22c 0 or less,
The space formed by the inner wall of the nozzle and the seal member 26 by pressing the nozzle 25 against the chemical vial 30 housed in the fixed box 29 via the suction needle 31 and rotating the rear cylinder 23 in the reverse direction to retract the seal member 26. The chemical is taken into the (cell), and the number in the display window matches the amount of the chemical.

For example, as a drug solution, insulin U-10 is used.
When 0 is used, one unit amount corresponds to 0.01 cc. When the rear cylinder 16 is rotated by 72 ° as shown in FIG. 7, one unit amount and five unit amounts of the chemical liquid per rotation pitch are taken in. .

[0006]

The conventional needleless syringe is constructed as described above. However, in order to inhale a required amount of the liquid medicine, the rear cylinder is rotated counterclockwise and retracted to the required amount of the liquid medicine. When trying to match the corresponding scale number, the rear cylinder can be turned monotonously with a constant rotational force, so that turning may exceed the required scale number. Once
When the required scale number is exceeded, even if the rear cylinder is rotated clockwise and advanced to return to the required scale, the piston rod 28 is moved between the piston 27 and the piston rod 28 in order to make the movement at the time of injection of the chemical liquid faster. Is provided with a certain amount of play in the axial direction.
Since there is little return of 7, there is a problem that the scale number and the required amount of chemical solution do not match, and it is necessary to start over from the beginning. If the rear cylinder is carefully rotated and set in order to avoid such a problem at the time when the scale is over, there is a problem that it takes time and effort to adjust the scale, and a heavy burden is imposed on the user, particularly when the frequency of use is large. The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a needleless syringe which can easily adjust the scale without excessively moving.

[0007]

In order to achieve the above object, a needleless syringe according to the present invention comprises a front cylinder having a front end connected to a nozzle for sucking a drug solution, and a piston for pressurizing the drug solution in the nozzle. A connected piston rod, a latch mechanism for fixing the piston rod, and a release switch for releasing the latch mechanism are provided, and a rear cylinder screwed to the front cylinder is provided. In a needleless syringe that presses the energized piston at a high speed and injects a drug solution, a click mechanism that has a projection on the front cylinder and a groove on the rear cylinder generates a click action at a constant rotation angle of the rear cylinder It is characterized in that it is made to be.

Further, the needleless syringe according to the present invention is characterized in that a slit is provided in the vicinity of the protruding portion so that the protruding portion of the front cylinder has a radial spring property. Is characterized by the asymmetrical rising shape of both side walls of the groove provided on the rear cylinder, and the provision of a plurality of protrusions and grooves corresponding to the circumference of the front cylinder and the rear cylinder. It is assumed that. The needleless syringe of the present invention is configured as described above, and by providing a click operation for the rotation of the rear cylinder, it is possible to obtain a needleless syringe that can be easily calibrated without going too far.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a needleless syringe according to the present invention will be specifically described below with reference to FIGS. FIG.
1 is a top view (a) and a vertical cross-sectional view (b) of the needleless syringe of the present invention, and FIG. 2 is a cross-sectional view including the protrusion 2d of FIG. As shown in FIG. 1, the needleless syringe of the present invention has a hard resin cylinder 4 in which a front cylinder 2 and a rear cylinder 3 each having both open end faces are screwed together with a screw portion 2b. It has.

The front cylinder 2 has a display window 2c on its outer peripheral surface for displaying the amount of liquid chemical taken, a projection 2d inside the rear thin portion as shown in FIG.
, A nozzle 5 having an injection hole 5a is screwed, and a ring-shaped stopper plate 6 is fixed to the inside of the tip. The rear cylinder 3 has grooves 3a as shown in FIG. 2 formed at regular intervals on the circumference of the rear end of the thin portion, and a ball receiver 14 is screwed into the rear cylinder 3 to slightly protrude from the rear end opening. In this state, the release switch 15 is inserted so as to be able to advance and retreat, and a number sticker 10 (FIG. 7) corresponding to the amount of chemical solution taken in is wound around the thin portion.

A piston rod 11 which is concentric with the cylindrical body 4 and is movable in the axial direction is provided, and a distal end portion thereof is provided with a sealing member 12 for sealing the inhaled chemical liquid.
Is connected to the piston 13, and a groove 11 a is formed circumferentially behind the piston 13, and the flange ring 8 is integrally attached thereto. Between the flange ring 8 and the end face 14a of the ball receiver 14, the piston rod 1
1, a strong compression spring 9 is interposed, and the piston rod 11 is always urged forward. Further, a compression spring 16 is interposed between the ball receiver 14 and the release switch 15, and the release switch 15 is always urged with a retreating force.

The ball receiver 14 has a plurality of small holes 14b penetrating therethrough in the circumferential direction.
The latch ball 18 is fitted in b. When the release switch 15 is pressed, the flat portion of the ball retainer 17 advances beyond the latch ball 18, and the recess of the ball retainer 17 is locked with the latch ball 18 by the retreat force of the compression spring 16, Parts from the ball receiver 14 to the latch ball 18 can be advanced together with the rear cylinder 3.

The inhalation and injection of a drug solution by the needleless syringe 1 having the above-described structure are performed in the following procedure. When the front cylinder 2 is gripped with one hand and the rear cylinder 3 is rotated and advanced with the other hand, the display number in the display window 2c decreases to 0 or less,
The latch ball 18 falls into the groove 11a. At the same time, the release switch 15 is
The latch ball 18 protrudes backward until limited by b, the latch ball 18 is pressed by the flat portion of the ball retainer 17, the piston rod 11 is latched by the rear cylinder 3, and the preparation for inhalation of the drug solution is completed.

Next, a chemical vial 3 as shown in FIG.
The distal end of the nozzle 5 is pushed into the fixed box 29 containing the cartridge 0, and the drug solution vial 30 and the needleless syringe 1 are connected.
Then, the liquid medicine is sucked while the rear cylinder 3 is retracted.
The retracting distance of the piston rod 11, that is, the retracting distance of the rear cylinder 3 (proportional to the rotation angle of the numeral seal 10) is 1
It corresponds to the amount of the chemical solution injected in each injection.

A feature of the present invention is that, during this liquid medicine inhaling operation, the projection 2d provided on the front cylinder 2 comes into and out of the groove 3a provided on the rear cylinder 3 corresponding to the number of the display window. The click feeling is transmitted to the user and the protrusion 2
The rotation brake applied to the rear cylinder 3 when d comes out of the side wall of the groove 3a prevents excessive graduation.

When the release switch 15 is pressed while the injection port 5a is in contact with the injection point of the patient after setting the amount of the chemical solution to be taken, the flat portion of the ball retainer 17 is
, The latch ball 18 jumps out of the groove 11a, the piston rod 11 advances at a high speed, the chemical liquid is injected, and the state returns to the state shown in FIG.

FIG. 3 shows a projection 2d of the front cylinder 2 and a groove 3a of the rear cylinder 3 for explaining another embodiment of the front cylinder 2.
FIG. 2 shows a side view (a) of the vicinity and a cross-sectional view (b) of FIG. This embodiment is characterized in that slits 2e are provided on both sides of the projection 2d. As a result, the protrusion 2d can be provided with a spring property in the radial direction with the innermost portion of the slit 2e as a fulcrum, so that smooth rotation of the rear cylinder 3 and a good click feeling can be obtained, and the protrusion 2d can be obtained.
Wear can be reduced.

FIG. 4 shows the shape of the groove 3a of the rear cylinder 3 according to another embodiment of the rear cylinder 3. As shown in FIG. The feature of the present embodiment is that the rising angle of the side wall surface of the groove 3b is increased with respect to the advancing direction (arrow direction) of the protrusion 2d when the rear cylinder 3 is retracted, as shown in FIG. That is, the angle is reduced. Thus, when the rear cylinder is rotated in the forward direction, the resistance due to the protrusion 2d is small, and the cylinder can be easily rotated. A strong rotational force is required to get out of the groove 3a provided, and the click feeling and the rotational resistance force at this time are transmitted to the user accurately, and the visual sense and the click feeling are used in combination to adjust the scale. Can be prevented from going too far.

FIG. 5 shows another embodiment of the front cylinder 2, which shows a cross section of a projection 2 d of the front cylinder 2 and a groove 3 a of the rear cylinder 3. That is, this embodiment is characterized in that the front cylinder 2 is provided with the grooves 3a in accordance with the scale numbers, and the rear cylinder 3 is provided with a plurality of projections 2d. As a result, the height of the protrusion 2d of the front cylinder 2 can be reduced, the contact pressure between the rear cylinder 3 and the front cylinder 2 is averaged on the circumference, rotation unevenness is eliminated, and the gap between the grooves 2d is reduced. Smooth rotation of the rear cylinder can be obtained. In this embodiment, the number of the protrusions 2d is three, but the number is not limited to three as long as it is plural.

[0020]

The needleless syringe of the present invention is constructed as described above, and each time the scale number changes, the change in the rotational force and the click feeling are transmitted to the user. Can be easily grasped, the target number can be matched without going too far, and the feeling of fatigue, especially when the number of injections is large, can be reduced.

[Brief description of the drawings]

FIG. 1 is a top view (a) and a longitudinal sectional view (b) of a needleless syringe according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a click mechanism according to the present invention.

FIGS. 3A and 3B are a partial side view and a sectional view taken along line AA of a click mechanism according to another embodiment. FIGS.

FIG. 4 is a cross-sectional view of a groove of a click mechanism according to another embodiment.

FIG. 5 is a cross-sectional view of a click mechanism according to another embodiment.

FIG. 6 is a connection diagram of a conventional needleless syringe and a drug solution vial.

FIG. 7 is a development view of a number sticker.

[Explanation of symbols]

1, 21 ... needleless syringe 2, 22 ... front side cylinder 2a, 2b ... screw part 11, 28 ... piston rod 2c, 22c ... display window 11a ... groove 2d ... Projection parts 12, 26 ... Seal member 2e ... Slit 13, 27 ... Piston 3, 23 ... Rear cylinder 14 ... Ball receiver 3a ... Groove 14a ... End face 3b ... -Stop hole 14b-Small hole 4, 24-Cylindrical body 15-Release switch 5, 25-Nozzle 15a-Stopper 5a-Injection hole 17-Ball holder 6- -Stopper plate 18-Latch ball 8-Flange ring 29-Fixed box 9, 16-Compression spring 30-Chemical vial 10-Numeral seal 31-Suction needle

Continued on the front page (72) Inventor Haruhide Udagawa 1 Shiwazu Nishinokyo Kuwabaracho, Nakagyo-ku, Kyoto Co., Ltd. Shimadzu Corporation (72) Inventor Kazumi Morishita 1 Shiwazu Nishinokyo Kuwabaracho, Nakagyo-ku, Kyoto Co., Ltd. Shimadzu 72 Co., Ltd. Inventor Masahiko Yoneya 1-11-13 Shimizu, Asahi-ku, Osaka-shi F-term in Nippon Pharmaceutical Co., Ltd. 4C066 AA10 BB01 CC01 DD13 EE06 FF02 HH26 QQ22

Claims (4)

[Claims] 1. A front cylinder connected to a nozzle for sucking a chemical solution at a distal end thereof, a piston rod connected to a piston for pressurizing a chemical solution in the nozzle, a latch mechanism for fixing the piston rod, and release of the latch mechanism. In a needleless syringe that includes a rear cylinder that is provided with a release switch to be screwed to the front cylinder and that pushes a piston urged forward in a latched state at a high speed to inject a drug solution, the front cylinder A needleless syringe, wherein a click operation is generated at every constant rotation angle of the rear cylinder by a click mechanism having a projection and a groove formed in the rear cylinder. 2. The needleless syringe according to claim 1, wherein a slit is provided in the vicinity of the projection so that the projection of the front cylinder has a radial spring property. 3. The rising shape of both side walls of the groove provided in the rear cylinder is asymmetric.
The needleless syringe as described. 4. The needleless syringe according to claim 1, wherein a plurality of protrusions and grooves are provided on the circumference of the front cylinder and the rear cylinder in a corresponding manner.