JP3028227B1 - Disposal needleless syringe - Google Patents

Abstract

An object of the present invention is to provide a needle-free injector capable of filling a drug solution with a small force in a short time by a simple operation, and reducing skin damage and eliminating infection. SOLUTION: An injection opening 7 is provided in front of a chemical liquid storage cylinder configured to be mounted on a driving device 10 for driving a piston 5 at high pressure, and an inner unit 8 in which the piston 5 is built in the cylinder. In front of the outer cylinder fixed to the inner unit 8 in the fitted state, the nozzle communicates with the injection opening 7 in front of the cylinder of the inner unit 8 and has a smaller diameter than the injection opening 7. And an outer unit 3 provided with a small-diameter nozzle 1 functioning as a nozzle. When the chemical solution 4 is filled, the outer unit 3 is filled out from the injection opening 7 of the inner unit 8 without or with the outer unit 3 removed. Disposable needleless syringe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle-free injector used for medical purposes, and more particularly to a disposable needle-free injector eliminating infection.

[0002]

2. Description of the Related Art Needleless syringes, which are driven at a high pressure by a piston or the like and eject a drug solution from a nozzle, are capable of instantaneous injection and have a fear of needles and pain of needle insertion. It was an excellent syringe, but there was a risk of infection.

[0003] Therefore, similarly to a needle-type syringe, a syringe cylinder containing a drug solution having a nozzle and a piston is detachably attached to a driving device driven at high pressure by a locking portion of the unit as a disposable unit. In recent years, disposable needle-free injectors have been developed which are disposable. These have a configuration in which a through-hole is formed in the skin by injection flow from the nozzle and injection is performed. For this reason, for example, when the diameter of the nozzle hole is φ0.6, the diameter of the through-hole in the skin becomes large, so that the skin is greatly damaged. It is known that pain increases.

Therefore, ideally, it is desirable to use a nozzle having a small diameter of about 0.1 to reduce damage to the skin and to reduce pain as much as possible.

On the other hand, it is necessary to previously fill the disposable unit with a chemical solution. The method is to push and fill the chemical solution from the front of the nozzle, or to withdraw the piston and move it using negative pressure to move the chemical solution through the nozzle. It was configured to be filled.

However, in this filling operation, as described above, as the diameter of the nozzle is ideally made smaller, the force of the push-in filling and the pull-back force of the piston increase due to the viscosity of the chemical solution (hereinafter, the force required for this filling). Is abbreviated as filling power.) Unless a device capable of imparting a specially high filling power is used, filling in a short time is difficult.

In the case of manual filling, filling with a small diameter takes a longer time than a needle type syringe, and the filling time becomes a problem for a doctor who treats many patients.

Therefore, the conventional nozzle diameter is set by finding a compromise in consideration of the pain caused by skin damage, the filling power and the filling time.
The filling operation was very cumbersome and tended to cause severe skin damage.

As described above, in the conventional disposable needleless syringe, although the possibility of eliminating infection can be obtained for a time, the filling power of the chemical liquid filling work is increased and the time required for the operation is increased in terms of actual use at medical sites. There were issues such as the problem and the inhibition of miniaturization of the nozzle diameter related to skin damage.

The present invention finds such problems (problems) in conventional needle-free injectors, and provides an epoch-making disposable needle-free injector that solves these problems by an inexpensive method.

[0011]

The gist of the present invention will be described with reference to the accompanying drawings.

[0012] An injection opening 7 is provided in front of a chemical liquid storage cylinder which is configured to be mounted on a driving device 10 for driving the piston 5 at high pressure. The front of the outer cylinder fixed to the inner unit 8 in a fitted state is communicated with the ejection opening 7 in front of the cylinder of the inner unit 8, and the ejection opening 7 is provided.
An outer unit 3 provided with a small-diameter nozzle 1 functioning as a nozzle having a smaller diameter, and an injection opening of the inner unit 8 in a state where the outer unit 3 is not provided or the outer unit 3 is removed when the chemical liquid 4 is filled. The present invention relates to a disposable needle-free injector characterized in that the liquid medicine 4 can be filled from the part 7.

A disposable unit (disposable unit 9) in which a chemical liquid 4 and the piston 5 are provided in a driving device 10 for driving the piston 5 at high pressure by the force of gas, spring, or the like.
The injection unit 7 is provided with an injection opening 7 in front of a cylinder for accommodating a drug solution, and an inner unit 8 in which a piston 5 is provided in the cylinder. An outer unit 3 provided with a small-diameter nozzle 1 that communicates with the injection opening 7 and has a smaller diameter than the injection opening 7 and functions as a nozzle in front of an outer cylindrical body fixed in a fitted state.
Constitutes the disposable unit 9, and fills the inner unit 8 with the chemical solution 4 and then fits the outer unit 3 to form the disposable unit 9 as the disposable unit 9.
The present invention relates to a disposable needle-free injector characterized in that it is configured to be mounted on the needle.

A retracting portion 11 for pulling the piston 5 is provided at the rear of the piston 5 provided in the cylindrical body of the inner unit 8. When the chemical 4 is filled, the retracting portion 11 is moved rearward. The liquid medicine 4 is drawn into the cylindrical body from the injection opening 7 of the cylindrical body by being pulled and the piston 5 is pulled rearward, whereby the cylindrical body can be filled. The present invention relates to the disposable needle-free injector according to the above section.

The retraction unit according to claim 3, wherein the retraction unit (11) is configured to cut or remove or bend the piston (5) after filling the liquid chemical so that the piston (5) cannot be pulled. It relates to a needle syringe.

Further, the outer cylinder of the outer unit 3 is detachably mounted on the driving device 10 so that the outer unit 3 is fixedly fitted to the inner unit 8. A disposable needleless syringe according to any one of claims 1 to 4.

The inner unit 8 is provided with the injection opening 7 having a diameter larger than the diameter of the minute nozzle 1 of the outer unit 3 at the front of a cylindrical body formed of a transparent resin, and at the outer periphery at the rear. A flange 19 which is locked behind the outer unit 3 and which is locked to a mounting portion of the driving device 10
The disposable needle-free injector according to any one of claims 1 to 5, characterized in that:

The outer cylinder of the outer unit 3 having an inner diameter substantially matching the outer diameter of the inner unit 8 is provided with the minute nozzle 1 having a small diameter at the front and the driving device at the rear.
A locking portion 23 that can be detachably attached to 10 is provided,
The needleless needle according to any one of claims 1 to 6, wherein the outer unit (3) is configured to increase its strength so as to prevent expansion and rupture by high-pressure driving of the inner unit (8). It relates to a syringe.

Further, when the disposal unit 9 composed of the inner unit 8 and the outer unit 3 is mounted on the driving device 10, the engaging unit is fixed so that the inner unit 8 and the outer unit 3 are fixed at predetermined positions. 8. The disposable needleless syringe according to claim 7, wherein the flange 23 and the flange 19 are configured to correspond to a mounting portion of the drive device 10.

Further, the length of the piston 5 is set so that the predetermined amount of the chemical solution 4 can be set by the mutual position between the rear end of the piston 5 and the rear end of the cylindrical body of the inner unit 8. The disposable needle-free injector according to any one of claims 1 to 8.

Further, a small nozzle piece 20 having a small-diameter nozzle 1 at the center thereof is provided in front of the outer unit 3 with an outer shape not falling off from the outer unit 3 by the high-pressure driving. A disposable needle-free injector according to any one of claims 1 to 9.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment (how to carry out the invention) of the present invention, which is considered to be the best, will be briefly described with reference to the drawings, showing its operational effects.

When the chemical solution 4 is filled into the cylinder of the inner unit 8, the piston 5 provided in the cylinder of the inner unit 8 before the outer unit 3 is fitted or the inner unit 8 from which the outer unit 3 is removed. Is moved backward to fill the liquid medicine 4 from the injection opening 7 at the front of the cylinder.

In this case, since the injection opening 7 is set to be relatively large as the opening for filling the chemical solution, the filling can be easily performed.

After the filling is completed, the large opening 7 has a large through-hole in the skin, causing greater damage to the skin and increased pain. Small diameter nozzle 1 of about φ0.1
The outer cylinder provided with is fitted and fixed to the inner unit 8 as the outer unit 3.

A driving device for driving the piston 5 at high pressure
By pushing the piston 5 by 10, the inner unit 8
Of the chemical liquid 4 in the cylinder through the injection opening 7 and the outer unit 3
Is injected into the skin from the micro-diameter nozzle 1.

Therefore, the small-diameter nozzle 1 functioning as a nozzle for injecting into the skin does not need to take into account the operation of filling with a chemical solution.
Pain can be reduced.

Further, since the inner unit 8 is fitted by the outer unit 3, the inner unit 8 has a structure capable of improving the strength against expansion, rupture and the like during high-pressure driving. In addition, since the disposal unit 9 including the inner unit 8 and the outer unit 3 can be detachably attached to the drive unit 10 and can be disposable, infection can be prevented, and as described above, the liquid medicine can be easily filled in a short time. Yes, and it can reduce pain.

Further, if a retraction portion 11 is provided at the rear of the piston 5 provided in the cylindrical body of the inner unit 8, the retraction portion 11 can be easily pulled out from the injection opening 7 designed to be large. If the liquid medicine 4 can be filled in the cylindrical body of the disposal unit (inner unit 8), and if the piston 5 is made non-pullable by, for example, cutting off the retraction part 11, the retraction part is filled after the liquid medicine 4 is filled. By cutting, for example, 11, it is possible to reliably prevent reuse, that is, refilling with a drug solution after use, thereby causing the risk of infection.

That is, according to the present invention, the chemical liquid 4 is first filled in the inner unit 8 by pulling back the piston 5 like a needle type syringe through the injection opening 7 having a relatively large diameter. Since the diameter of the opening 7 is set to be large, the liquid medicine 4 can be filled with a small filling force, and the operation can be completed in a short time by manual operation.

The filled inner unit 8 is combined with the outer unit 3 having the small-diameter nozzle 1 to be combined with the outer unit 3 to form the disposable unit 9, so that the function and performance are not compromised, but rather the needle type. It can be designed so that the filling operation can be performed in a shorter time with better operability than that of the syringe described above, and since the nozzle at the time of injection has a very small diameter, the injection can be performed with less damage to the skin and eliminating infection.

[0032]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic sectional view of the first embodiment. The outer unit 3 is shown in FIG. 2, the inner unit 8 is shown in FIG. FIG. 6 shows the combined configuration of the disposal unit 9 and FIG. 1 shows the situation in which the disposal unit 9 is mounted on the drive device 10. The specific configuration and operation and effect of each will be described. An inner unit 8 comprising a cylindrical body having a wall surface 6 provided with an injection opening 7 having a relatively large diameter (for example, φ0.6) at the front center is provided as shown in FIG.

The cylinder has an inner diameter (for example, φ5) corresponding to a single injection amount (for example, 0.1 ml) of the drug solution 4, and is made of a transparent and chemically resistant resin so that the medicine can be seen.

The expansion or rupture caused by the high-pressure drive is
Therefore, the thickness may be smaller than the outer unit 3 (for example, 1 mm). Further, the outer diameter of the cylindrical body is set to a diameter (slidable) corresponding to the inner diameter of the outer unit 3. A flange 19 is formed at the rear end of the inner unit 8 so as to be in contact with the rear end of the outer unit 8 so that the inner unit 8 does not break through the front of the outer unit 3 when pressed from behind.

A piston 5 is provided inside the cylindrical body with a retraction portion 11 for rearward retraction projecting rearward.

The length of the piston 5 is set so that the rear end of the piston 5 coincides with the position of the rear end of the flange 19 when a predetermined amount of the chemical solution 4 is filled.

The pull-back portion 11 has a cut portion 12 which can be bent, cut and separated at the rear end of the piston 5, and the pressing strength of the material is such that the piston 5 can be pushed to the front position in an empty state without the chemical solution 4. Good strength. Further, the tensile strength may be in a range that can withstand pulling back of the piston 5 at the time of filling a chemical solution, which will be described later, so that a thin rod-shaped structure as shown in FIG. 3 may be used.

As another example of the pull-back portion 11, the lower portion of FIG. 3 shows an example in which the pull-back portion 11 is a thread-like pull-back portion 11 '. In this case, a special rod (not shown) is required to push and move the piston 5 to the front position when there is no chemical liquid, but the retraction part 11 'is easily cut off near the rear end of the piston 5 with scissors or the like. There are benefits to doing things.

Next, an outer unit 3 comprising an outer cylindrical body having a wall surface 2 provided with a small-diameter nozzle 1 at the front center is constructed as shown in FIG. The diameter of the small diameter nozzle 1 is set to a small diameter (for example, φ0.1) so as to reduce damage to the skin, and a locking portion 23 for detachably attaching to a driving device 10 described later is provided at the rear end of the outer unit 3. Provide. The locking portion 23 can be arbitrarily made, such as a structure in which a key groove is provided or a structure in which the locking portion 23 is pressed from the outside by a chuck. However, for simplification of description, in FIG. The inner diameter of the outer cylinder is set to a diameter (so that it can slide) according to the outer shape of the inner unit 8.

Also, the material of the outer cylinder is made transparent so that the liquid medicine can be seen, and the expansion or rupture due to the high-pressure drive of the inner unit 8 is further suppressed from the outside so that the minute diameter nozzle 1 is not deformed during one injection. The inner unit 8 is made thicker (for example, 3 mm) so as to have sufficient strength so as to keep sufficient strength.

Further, behind the small diameter nozzle 1 and the injection opening 7
Is provided with a rubber-like seal ring 15 to be installed in front of.

The inner diameter is larger than the diameter of the injection opening 7 (when pressed). Thus, the inner unit 8 and the outer unit 3 are configured in a simple form.

Next, the filling of the chemical solution 4 will be described. However, since this operation can be performed in substantially the same manner as a conventional needle type syringe, it will be briefly described.

As shown in FIG. 4, a resin needle 13 which is slidable on the outer diameter of the front face of the inner unit 8 and has a large inner diameter (for example, φ0.7) is provided. Install the inner unit 8 with 5 set at the front position,
The chemical solution 4 is filled into the inner unit 8 by the pull-back operation of the pull-back unit 11. Since the injection opening 7 of the inner unit 8 is large, the filling power is smaller than that of the conventional needle type syringe and the filling can be completed in a short time.

Thus, the inner unit 8 is filled with the chemical solution 4 with good operability.

Thereafter, as shown in FIG. 5, the unnecessary pull-back portion 11 is cut (bent) at the cut portion 12 at the rear end of the piston 5.

Here, as shown in FIG. 6, a cover 16 (provided with a recess or a hole so as to avoid the remaining portion of the cut portion) is placed behind the inner unit 8 where the retraction member 11 has been removed, and the piston 5
Prevent them from moving.

When the length of the piston 5 is set so that the rear end of the piston 5 coincides with the position of the rear end of the inner unit 8 when a predetermined amount of the chemical is filled, the rear lid 16 is attached. Thus, the position of the rear end of the piston 5 and the position of the rear end of the inner unit 8 can be made to coincide with each other, so that an accurate amount of the chemical solution 4 can be secured and the air that has entered the inner unit 8 can be removed.

Alternatively, if the surface of the lid 16 in contact with the piston 5 is made concave or convex, fine adjustment of the amount of the chemical solution is possible. Further, a recess or a through hole as shown in FIG. 6 may be provided at the center of the lid 16 attached to the rear so as to avoid the remaining protrusion of the cut portion 12. Next, as shown in FIG. 6, the outer unit 3 is gently slid and covered with the seal ring 15 interposed therebetween.

Since the air inside the outer unit 8 has a low viscosity coefficient, it is easily discharged through the small diameter nozzle 1. The lid 16 is placed in front of the outer unit 8 in consideration of the movement and the like.

Thus, the composite unit 9 is completed under sterile conditions. The completed disposal unit 9 has the lid 16 removed during use as shown in FIG.
At the same time, the inner unit 8 is pushed forward and presses the seal ring 15 to be set at a predetermined position with the outer unit 3 at the same time as being attached to the driving device 10 by the locking portion 23 and the flange 19 as described above.

The driving device 10 has a driving rod 18 at the rear end of the piston 5 to push the piston 5 forward with high pressure by gas or spring force to inject and inject the chemical solution 4 from the small diameter nozzle 1. Becomes Since a part of the above-mentioned cut portion 12 may remain at the tip of the drive rod 18, a recess may be provided at the center of the front surface as shown in the figure.

In the case of gas drive, it is also possible to directly push the rear of the piston 5 without the drive rod 18.

Of course, at the end of the injection, the disposable unit 9 is detached by the attachment portion 23 and discarded to eliminate the infection. In the above description, the system has been described as a system in which the medical solution 4 is filled in advance and provided to the physician as a completed disposal unit 9. However, since the configuration and operation are simple as described above, each part (outer unit, inner unit) is used. , Lid, etc.) may be provided to the physician in a separated state, and a new chemical solution may be selected or mixed with a chemical solution whenever necessary, and then filled and then assembled into a system for use at the medical site (resin needle 13 may be used). Even if it is not necessary, the front of the inner unit 8 can be directly filled with a chemical solution and filled, and at the time of group administration or the like, there is only one resin needle 13).

In this system, after the high-pressure drive, the inner unit 8 expands, making it difficult to easily remove it from the outer unit 3, and more importantly, the retraction unit 11 is cut and discarded after the chemical solution is filled. So refilling is not possible,
It has the effect of eliminating infection due to reuse, such as a needle syringe that has been discarded.

Further, since the composite unit of this embodiment has a structure in which the function and performance are separated into two units, the filling power and the filling time can be reduced as compared with the needle type syringe, and further, the damage to the skin can be reduced.

As described above, since the first embodiment is constructed and operates, there is no fear of the needle, the injection can be performed in a short time, and the merits of the needleless syringe which is considered to be less painful can be utilized. An inexpensive system that completely eliminates infection with operability and performance can be provided. The second embodiment will be described with reference to FIG.

The components having the same function and function are given the same reference numerals for the sake of simplicity of description, and the description is omitted.

As shown in FIG. 7, the outer unit 3 is made of a chemical-resistant metal, and a small-diameter nozzle 1 having a small diameter is provided at the center of the front wall surface.
And the locking portion 23 is provided at the rear end.

The outer unit 3 is required to have a function of injecting the chemical solution of the small-diameter nozzle 1 and a function of holding the expansion and rupture of the inner unit 8, but in the case of metal, sufficient strength is obtained, so that the thickness of the cylinder is thin (for example, 1 mm ), It is possible to reduce the size of the combined disposal unit 9. In this case, a small window (not shown) may be provided on the side surface of the outer unit 3 so that the chemical solution 4 can be seen.

In the third embodiment, a resin-molded outer unit 3 is used.
FIG. 8 shows an example in which a nozzle piece 20 is provided at a lower portion and the outer shape is a beam structure to reduce the cost.

A small nozzle piece 20 having an outer shape with a larger diameter at the rear end than the diameter at the front end and a small diameter nozzle 1 having a small diameter provided at the center thereof is provided. Provide a hole with a larger diameter at the rear than at the front,
The outer unit 3 is formed by attaching the nozzle piece 20 by press fitting, welding, bonding or the like.

The nozzle piece 20 is formed of a hard material having chemical resistance. A hard resin may be used, but if a glass or ceramic or the like as known in an optical fiber ferrule or the like is used, a small diameter nozzle 1 having a small diameter without variation can be easily formed. Further, the size of the nozzle piece 20 can be reduced by reducing the size (for example, the outer diameter of the rear end is φ3 and the length is 2 mm).

Further, by reducing the size, it becomes possible to easily produce a small-diameter nozzle 1 having a small diameter with a smaller distortion than a large-sized one. In the figure, a convex outer shape is shown, but under the above conditions, a gentle taper that does not come off by high-pressure driving may be used.

The structure in which the nozzle piece 20 does not fall out of the outer unit 3 due to high-pressure driving has been described with a taper or the like so that the nozzle piece 20 can be easily seen. It is good also as a structure which adheres. Alternatively, the outer shape of the nozzle piece 20 may be shaped like a drum, the hole of the outer unit 3 may be straightened, press-fitted, and then fixed by welding.

Since the outer unit 3 is constructed as described above, only the inner unit 8, the seal ring 15 and the nozzle piece 20 are in contact with the chemical solution 4 in the combined disposal unit 9; The transparent resin in the outer cylinder is independent of the chemical, and it is possible to select an inexpensive resin only by considering the strength that can prevent the expansion and rupture of the inner unit 8.

In this case, a seal ring 15 whose outer diameter is larger than the outer diameter of the rear end of the nozzle piece 20 when pressed and whose inner diameter is larger than the diameter of the injection opening 7 is appropriate in this case. Further, a configuration for reducing the cost of the outer unit 3 will be described with reference to FIG.

A horizontal beam 22 is provided on the outer periphery of the outer unit 3 in the longitudinal direction, and a vertical beam 21 is further provided in the circumferential direction so that the thickness of the straight portion of the outer cylinder is reduced (for example, 1.5 mm). May be configured.

With this configuration, even if the wall thickness is small, sufficient strength is obtained by the two beams, and the expansion of the inner unit 8 and the holding of the wall surface with the nozzle piece 20 can withstand high-pressure driving. Since the amount of material used is reduced, the outer unit 3 can be provided at a low cost in accordance with the weight reduction.

FIG. 9 shows a fourth embodiment.
In the case of a system that provides a doctor with a disposable unit 9 filled with, there is an example of automatic filling in a drug factory as shown in FIG. First, the inner unit 8 is set in the factory line as shown in FIG. 9, the piston 5 is set to the front position by the push rod 24 attached to the device as shown in FIG. The liquid 4 is filled from 25.

The outer unit 3 is put on the inner unit 8 as shown after completion of filling, and the inner unit 8 is completed as shown in the figure. In this case, since the chemical solution 4 is filled through the injection opening 7 having a large diameter, the operation is completed in a short time. . Further, since the filling is performed from the front, the retraction portion 11 behind the piston 5 is not particularly required here. Therefore, the piston 5 used in this system can be one without the retraction portion 11.

As described in the first, second, third, and fourth embodiments, the present embodiment is configured such that the disposal unit 9 is separated into the outer unit 3 and the inner unit 8 so that the required functions and performance can be reduced. Since there is no compromise as in the prior art, the function and performance can be easily enhanced, and it can be provided at a lower cost.

If the effect of this system is summarized from the user's point of view, doctors who are more busy in the future will have better operability than conventional needle-type syringes and will have a greater number of patients (group administration, etc.) in a short time. Injections can be given to patients of all kinds (including those with needle afraids and non-cooperative patients and animals who are rampaging) without fear of infection.

Further, since the system can be provided as a system in which the drug solution is filled in the disposal unit, the medical work can be simplified.

Further, since the structure and the operation are simple and easy, each part can be provided as a separated system, so that it is easy to fill and can be suitably used when preparing and injecting a necessary drug solution at a medical site.

In addition, there is no danger of a needle accident as in the case of the conventional needle type syringe, and even if a doctor tries to reuse a disposable unit which has been used once by mistake, it is impossible to refill the drug solution, so confusion is caused. Infected healthcare settings can completely eliminate infection.

[0078]

Since the present invention is constructed as described above, when filling the liquid medicine into the cylinder of the inner unit, the inner unit before the outer unit is fitted or the inner unit from which the outer unit is removed is removed. In order to move the piston inside the cylinder to the rear and fill the medicinal solution from the injection opening at the front of the cylinder,
Since the injection opening is set to be large as this liquid filling opening, it can be easily filled in a short time, while the small-diameter nozzle of the outer unit that functions as a nozzle that injects into the skin can be used for liquid filling. Since there is no need to consider this, an extremely small diameter can be ideally achieved, so that a revolutionary disposable needle-free injector that can reduce pain can be obtained.

Further, since the disposal unit including the inner unit and the outer unit can be detachably attached to the drive unit and can be disposable, infection can be prevented. Further, as described above, the chemical solution can be easily filled in a short time. In addition, it is an extremely innovative disposable needle-free injector that can reduce pain.

According to the third aspect of the present invention, since the retraction portion 11 is provided behind the piston, the retraction portion can be easily pulled and the chemical solution can be more easily dispensed from the oversized injection opening. Filling can be done,
Furthermore, in the invention according to the fourth aspect, it is possible to prevent the risk of infection by reusing the pull-back portion after filling with the drug solution, for example, by refilling the drug solution after use, thereby reliably preventing infection. It is an extremely innovative disposable needle-free syringe that can be achieved.

According to the fifth aspect of the present invention, since the inner unit is fitted by the outer unit, the inner unit has a structure capable of improving the strength against expansion, rupture, and the like during high-pressure driving.

According to the sixth and seventh aspects of the present invention, it is possible to easily realize the present invention which further exerts the above-mentioned effects.

In addition, the invention according to the eighth, ninth, and tenth aspects is an epoch-making disposable needleless syringe which is extremely easy to use and more excellent in practicality.

[Brief description of the drawings]

FIG. 1 is a schematic configuration explanatory view of a use state of a disposable needleless syringe according to a first embodiment.

FIG. 2 is a schematic configuration explanatory view of an outer unit of the first embodiment.

FIG. 3 is an explanatory diagram of a schematic configuration of an inner unit of the first embodiment.

FIG. 4 is a schematic structural explanatory view of the first embodiment at the time of filling a chemical solution.

FIG. 5 is a schematic structural explanatory view of the first embodiment at the time of cutting off the retraction portion.

FIG. 6 is a schematic structural explanatory view of a combined disposal unit of the first embodiment.

FIG. 7 is a schematic diagram illustrating the configuration of a disposable unit according to a second embodiment.

FIG. 8 is a schematic diagram illustrating a configuration of a disposal unit according to a third embodiment.

FIG. 9 is a schematic structural explanatory view showing a process from filling a chemical solution of a disposal unit according to a fourth embodiment to completion of provision thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Micro-diameter nozzle 3 Outer unit 4 Chemical solution 5 Piston 7 Injection opening 8 Inner unit 9 Disposal unit 10 Driving unit 11 Pullback unit 19 Flange 20 Nozzle piece 23 Locking unit

Claims (10)

(57) [Claims] 1. An inner unit in which an injection opening is provided in front of a cylinder for accommodating a chemical liquid, which is configured to be mounted on a driving device for driving a piston at high pressure, and an inner unit having the piston built in the cylinder, and an inner unit A small-diameter nozzle communicating with the injection opening in front of the cylindrical body of the inner unit, and having a smaller diameter than the injection opening, is provided in front of the outer cylindrical body fixed in a fitted state with respect to the nozzle. And an outer unit which is configured to be capable of being filled with a drug solution from the injection opening of the inner unit without the outer unit or with the outer unit removed when filling the drug solution. Needle syringe. 2. A needle-free injector comprising a drive device for driving a piston at a high pressure by the force of a gas, a spring, or the like, and a disposable unit (disposable unit) containing a drug solution and the piston. An injection opening is provided in front of a housing cylinder, an inner unit having a piston built in the cylinder, and the injection opening is provided in front of an outer cylinder fixed to the inner unit in a fitted state. The disposable unit is constituted by an outer unit provided with a small-diameter nozzle communicating with and having a smaller diameter than the injection opening and functioning as a nozzle, and after filling the inner unit with a chemical solution, the outer unit is fitted. A needleless needleless disposable syringe, wherein the disposable unit is configured to be mounted on the driving device. 3. A retracting portion for retracting the piston is provided behind the piston provided in the cylindrical body of the inner unit, and when filling the liquid medicine, the retracting portion is retracted rearward to move the piston. The disposable needleless syringe according to any one of claims 1 and 2, characterized in that the disposable needleless syringe according to any one of claims 1 and 2, wherein the liquid medicine is drawn into the cylindrical body from the injection opening of the cylindrical body by being pulled rearward. 4. The disposable needleless syringe according to claim 3, wherein the withdrawal portion is configured to be cut and removed or bent from the piston after filling the liquid medicine so that the piston cannot be pulled. 5. The apparatus according to claim 1, wherein the outer cylinder of the outer unit is detachably mounted on the driving device so that the outer unit is fixedly fitted to the inner unit. 5. The disposable needle-free injector according to any one of items 4 to 4. 6. The inner unit is provided with the injection opening having a diameter larger than the diameter of the minute nozzle of the outer unit in front of a cylindrical body formed of a transparent resin, and the outer unit of the outer unit is provided on the outer periphery in the rear. The disposable needleless syringe according to any one of claims 1 to 5, further comprising a flange that locks rearward and locks the mounting portion of the driving device. 7. The outer cylinder of the outer unit having an inner diameter substantially matching the outer diameter of the inner unit is provided with the minute nozzle having a small diameter at the front and detachably attachable to the driving device at the rear. The locking unit according to any one of claims 1 to 6, wherein the outer unit is further configured to increase strength so as to prevent expansion and rupture by high-pressure driving of the inner unit. The disposable needleless syringe according to the above. 8. The locking unit and the flange are driven so that the inner unit and the outer unit are fixed at predetermined positions when the disposal unit including the inner unit and the outer unit is mounted on a driving device. The needleless syringe according to claim 7, wherein the syringe is configured to correspond to a mounting portion of the device. 9. The length of the piston is set such that a predetermined amount of the chemical can be set by the mutual position between the rear end of the piston and the rear end of the cylindrical body of the inner unit. The disposable needle-free injector according to any one of claims 1 to 8. 10. A small nozzle piece having an outer shape not falling off from the outer unit by the high-pressure driving and having the small-diameter nozzle at the center thereof is provided in front of the outer unit. 10. The disposable needle-free injector according to any one of items 9.