JPH08243160A - Injection implement - Google Patents

Abstract

PURPOSE: To provide injection implement having an injection needle which is easily and inexpensively exchangeable at the time of use at one time each at the front end of a syringe by screwing a tip having a tube to a plug having screw threads on the outer peripheral surface formed at the front end of a cylinder body. CONSTITUTION: This injection implement A has the cylinder body provided with a flange 1a at the hand side end and is provided with the plug 2 having the screw threads on the outer peripheral part at the front end of the body 1. The plug 2 is provided with a through hole 2 formed to such a circular truncated cone shape that its diameter is decreased gradually toward the outside along the axial lien at its center. The plug 2 has an opening at its front end. The body 1 and the plug 2 of the injection implement A are produced by integral molding by using a polypropylene. The propylene tip 3 which has a through hole 3a and a through hole 3d continuing with the through hole 3a and having the diameter decreasing gradually toward the front end from the same diameter as the diameter of the through hole 3a at its center and is provided with screw threads in the internal part 3b so as to be screwed to the plug 2 is screwed to the outer periphery of the plug 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection device used for medical treatment and preventive treatment in the medical and dental fields, and more specifically to medical and dental treatment fields, especially in the oral cavity. The present invention relates to an injection device which can be used and can safely administer or apply a liquid or pasty medicine locally.

[0002]

2. Description of the Related Art In the fields of medicine and dentistry, medical treatments and preventive treatments such as locally applying or applying a liquid or paste-like drug locally (affected area) are frequently performed. For example, for subcutaneous injection or intravenous injection, it is common to use an injection syringe with an injection needle filled with a drug as an injection tool. Usually, the injection needle is detachably fitted to the head of the syringe tip so that it can be easily replaced in each treatment. However, it has been pointed out that the mounting by merely fitting may cause the injection needle to fall off due to the pressure of the drug when the piston is pushed in. In particular, such a syringe cannot be used because the possibility of dropping out becomes extremely high when a paste-like or highly viscous drug is injected.

In order to solve such a problem, a screw thread is provided on the outer peripheral surface of the tip of the syringe, and a needle-like fixing member screwed to the screw thread fixes the injection needle to prevent the round lock from falling off. A system syringe has been proposed (for example, Round Lock Syringe: manufactured by Terumo Corporation). Since such a syringe does not drop the injection needle,
Although it can be used for injection treatment of a medicine such as a dental paste composition, the fixing member made of metal or plastic used for preventing falling off is bulky, and thus the operability of the syringe is deteriorated.

Particularly in the dental field, a round-lock type syringe (for example, a root canal washing needle: Fujisawa) is used for the procedure of injecting a drug into the oral cavity of a child or injecting a drug into the root canal or periodontal pocket of an adult molar. However, there is a problem that the movable range of the syringe in the oral cavity is narrowed and fine treatment cannot be performed due to the bulkiness of the tip of the syringe. Therefore, it has been desired to provide a syringe in which the injection needle does not fall off even when a paste-like drug is used, and the tip of the syringe is not bulky.

[0005] On the other hand, a syringe formed by melting a tip of a plastic syringe having a small outer diameter and extending it into an integral capillary shape is used for dental treatment (for example, root canal syringe, Vitapex: Neopharmaceutical). Ltd.). This dental syringe is provided in a pre-filled form with about 2 ml of dental paste, and the capillary (corresponding to an injection needle) at the tip does not fall off when the paste is injected, and the tip part is not dropped. In addition, it is characterized by not using bulky members and having good operability.

However, from the viewpoint of hygiene, this dental syringe is provided on the assumption that it is to be thrown away after each use, and the syringe in which a considerable amount of the medicine still remains has to be thrown away. Therefore, it is not preferable from the viewpoint of suppressing medical expenses. In addition, in the treatment of the dental field, only a very small amount (about 10 to 100 μl) of the drug is often used at one time, so dentists do not use a single use of the syringe at one time, and many people use the same syringe. It was pointed out that there is a tendency to treat patients. Such a procedure is extremely dangerous in terms of hygiene. Therefore, it can be safely used for injection of dental paste.
It is important to provide an injection device that has good operability and that allows easy and inexpensive replacement of the injection needle for each use.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides an injection tool having a removable injection needle at the tip of a syringe so that the injection needle can be easily and inexpensively replaced at each use. The purpose is to do. Another object of the present invention is to provide an injection tool in which the injection needle does not fall off during injection even when used for injection of a paste or highly viscous drug. Still another object of the present invention is to provide an injection tool having the above-mentioned characteristics, having a syringe tip portion which is not bulky, and which can ensure good operability even in the oral cavity and the like.

[0008]

As a result of earnest efforts to solve the above problems, the present inventor has provided a tube for a plug provided at the tip of the cylinder body and having a thread on the outer peripheral surface. It has been found that an injection device having the above-mentioned characteristics can be provided by adopting a structure in which a tip is screwed, and has completed the present invention.

That is, according to the present invention, there are provided a plug provided at the tip of the cylinder body, having a thread on the outer peripheral surface thereof, and having a through hole extending along the axis, and a tube which can be screwed to the plug and fixed to the tip. And a tip having a through hole extending along the axis. From another point of view, according to the present invention, a plug provided at the tip of the cylinder body, having a thread on the outer peripheral surface, and having a through hole extending along the axis; screwable to the plug;
There is provided an injection device having a tip having a through hole extending along an axis; and a tube fixed to the tip of the tip.

According to a preferred aspect of each of the above inventions, the injection tool in which the tube can be replaced by screwing the tip in and out; the injection tool in which the tip and the tube are integrally molded of the same material; the cylinder body; The injection tool integrally molded with the plug; the injection tool in which the volume of the through hole of the chip is in the range of 1 to 50 times the total volume of the hollow portion of the tube; the through hole of the chip The volume of 5 to 10 relative to the total volume of the hollow portion of the tube
A double range of the injection device is provided.

According to another aspect of the present invention, the drug filled in the through-holes of the tip and the drug filled in the through-holes of the syringe main body and the plug and the contaminants stored in the tube. Each of the above injection devices characterized by preventing contact with a drug; and each of the above injection devices filled with a pasty drug; an injection including a storage tip screwable to the plug and the injection device. There is provided a device injection kit; a drug injection kit including the replacement chip and the injection device; and a drug injection kit further including a storage chip.

As a result of adopting the above-mentioned constitution, the injection device of the present invention prevents the tube from falling off even when a very high pressure is applied to the drug via the piston when a highly viscous paste drug is injected into the affected area. It is characterized by being able to carry out medical and dental treatments extremely safely without fear. Further, since the tube is fixed to the cylinder body by the tip, the tip portion of the cylinder is not bulky, and good operability can be ensured even in the oral cavity.

Furthermore, since the tube can be easily replaced by loosening the tip, it is convenient to replace the tube for each patient or to use a tube having a different tip shape according to various medical purposes. In addition, a certain amount of drug is stored inside the chip,
There is no direct contact between the drug inside the tube contaminated by the reverse flow of saliva or the like and the drug filled inside the main body. Therefore, even when it is repeatedly used, by exchanging the tip, the medicine inside the main body can be always kept in a non-contaminated state, which is very preferable from the viewpoint of hygiene.

[0014]

The preferred embodiments of the present invention will now be described more specifically with reference to the accompanying drawings, but the scope of the present invention is not limited to these embodiments. In addition,
FIG. 1 is an exploded view showing a cross section of a part of an injection tool A of the embodiment. FIG. 2 is a cross-sectional view of a main part of the injection device A according to the embodiment in use.

The injection tool A has a cylindrical main body 1 (outer diameter 7.0 mm × total length 90.0 mm × inner diameter 5.0 mm) having a flange 1a at the proximal end, and a screw is provided on the outer peripheral portion at the tip of the main body 1. A plug 2 having peaks is provided. The plug 2 has a conical trapezoidal through hole 2a whose diameter gradually decreases toward the outside.
Are provided along the central axis, and the plug 2 has an opening with a diameter of 2.0 mm at the tip. Injection tool A
The main body 1 and the plug 2 are manufactured by integral molding using polypropylene.

In addition, a 3.0 mm through hole 3a (total length 12.0 mm)
And a through hole 3d that is continuous with the through hole 3a and gradually narrows from the same diameter as the through hole 3a toward the tip end,
A polypropylene chip 3 having a screw thread on the inside 3b so as to be screwed in is screwed onto the outer periphery of the plug 2. At the tip of the tip, a hollow tube 3c (tip: outer diameter) whose outer diameter and inner diameter gradually narrow toward the tip
0.5 mm, inner diameter 0.3 mm; proximal part: outer diameter 2.0 mm, inner diameter 1.5
mm; total length 35 mm). The tip 3 and the tube 3c of the injection tool A are manufactured by integral molding using polypropylene.

The medicine 7 filled in the main body 1 is pressurized by a piston 6 having a silicon packing 9 at its tip, passes through the through holes 2a, 3a and 3d, and then the inside 3e of the tube. It moves and is discharged from the tip of the tube. After use, the tip is loosened, the tip is removed, and a new tip 3 is screwed on and used to treat another patient. When temporarily storing after use, the main body 1 is sealed by screwing a storage chip 8 in which the through holes 3a and 3d of the chip 3 are sealed with a filler 5 made of silicon rubber.

The shape of the main body 1 is particularly preferable as long as it has an internal hollow structure in which the medicine 7 can be filled and the piston 6 can pressurize the medicine, and a flange 1a for facilitating the pressing of the piston 6. Not limited. The material of the main body 1 is not particularly limited as long as it can ensure the mechanical strength of the plug 2 provided at the tip and is biologically and chemically inert. For example, polypropylene, polyethylene, metal, glass Materials such as acrylic resin, polystyrene, and fluororesin are suitable. The shape of the plug 2 is not particularly limited as long as it can be screwed into the chip 3, and the material thereof is not particularly limited as long as it is the same as the material of the main body 1, but the same material as the main body 1 is preferable.
For example, like the injection tool A, it is a preferred embodiment of the present invention that the main body 1 and the plug 2 are integrally molded using the same material (for example, polypropylene).

The material of the tube and the tip is not particularly limited as long as it can ensure the mechanical strength and is biologically and chemically inert. For example, it is possible to manufacture it with a material such as metal such as polypropylene, polyethylene, stainless steel, glass, acrylic resin, polystyrene, or fluororesin such as Teflon. It is preferable to manufacture the tube from annealed stainless steel because the tube can be easily bent according to the purpose of treatment.

The shape of the tip 3 is not particularly limited as long as it can be screwed into the plug 2 and can secure sufficient mechanical strength for fixing the tube 3c. However, if the outer diameter of the tip 3 becomes larger than the outer diameter of the main body 1, the tip of the injection tool may become bulky and the operability of the injection tool may deteriorate, so the outer diameter of the tip 3 is larger than the outer diameter of the main body 1. It is not preferable that the size becomes large. Further, if the outer diameter of the tip 3 is significantly different from the outer diameter of the main body 1, the interface between the tip 3 and the main body 1 may damage the oral mucosa when the injection device of the present invention is used for treatment of the oral cavity or the like. is there. Therefore,
It is preferable that the outer diameter of the tip 3 be substantially the same as or slightly smaller than the outer diameter of the main body 1 so that no step can be formed on the outer periphery of the boundary between the tip 3 and the main body 1.

The tube is not particularly limited as long as it has an appropriate outer shape according to the purpose of treatment and the condition of the affected area and an internal hollow structure capable of moving the drug, but for example, it is gradually tapered toward the distal end. It is preferably molded into a hollow pipe shape such that the outer diameter and the inner diameter are narrow. The shape of the tip of the tube is not particularly limited, but when used for injection such as subcutaneous injection or intravenous injection, it should have a slanted tip like the tip of a normal injection needle. Is. Further, in the case of simply applying the drug to the affected area or injecting the drug into the root canal or the periodontal pocket in the dental area, the one having a straightened tip shape is preferable.

The tip and the tube are arranged so that the tube does not fall off due to the pressing of the piston 6, for example, adequate mechanical strength can be secured by appropriate means such as screwing, fitting, or adhering. It should preferably be fixed to a non-detachable degree. In order to secure sufficient mechanical strength and reduce the manufacturing cost, the injection tool A
As described above, it is preferable to integrally mold the chip 3 and the tube 3c with the same material (for example, polypropylene). It is preferable that no step be formed on the outer circumference of the boundary between the tip 3 and the tube 3c so that the boundary between the tip 3 and the tube 3c does not damage the oral mucosa. It is also preferable that the outer periphery of the tip 3 is processed to prevent slipping so that the tip 3 can be easily screwed into the plug 2.

The shape of the through hole provided in each of the plug 2 and the tip 3 should be selected so that the drug can be efficiently moved to the hollow portion 3e of the tube by pressing the piston 6. Generally, a through hole is formed in the center of each of the plug 2 and the tip 3 so as to have a hollow cylindrical shape or a tapered truncated cone shape along the axis, or a hollow shape that is a combination of a cylindrical shape and a tapered truncated cone shape. Good. For example, a tapered frustoconical through hole 2a provided in the plug 2 of the injection tool A, and a cylindrical through hole 3a and a tapered frustoconical through hole provided in the tip 3 of the injection tool A
The combination of 3d is a preferred embodiment of the present invention.

One of the features of the injection tool of the present invention is that a certain amount of drug is stored in the through-hole inside the chip 3 and the drug inside the tube 3e contaminated by the reverse flow of saliva and the main body 1 are stored.
The point is that there is no direct contact with the drug filled inside. By adopting such a configuration, even if an erroneous operation is performed such that the piston is slightly pulled back during treatment, the main body 1
The medicine inside (and the through hole of the plug 2) can always be kept in a non-contaminated state. Therefore, it is preferable that the through holes 3a and 3d provided in the chip 3 have a volume that is several times to several tens of times the total volume of the hollow portion 3e of the tube. In addition, as another means for preventing the backflow of the contaminated drug, the diameter of the opening at the tip of the plug 2 is set to the through hole of the chip 3.
It is preferable that the diameter is substantially the same as or slightly smaller than the diameter of 3a, and / or the through hole 2a is formed in a truncated cone shape so that the diameter becomes gradually smaller toward the opening.

The storage chip 8 may be manufactured by sealing the through hole of the chip 3 with a filler 5 made of a material having a high elasticity such as silicon rubber, fluororubber, chlorinated rubber, and natural rubber. Alternatively, the storage chip 8 may be integrally molded into the same shape as the chip 3 without forming the through hole. Such a mode is preferable from the viewpoint of production cost. The material of the piston 6 is preferably the same as the material of the main body 1. Further, as the material of the packing 9, a material having high elasticity such as silicone rubber, fluororubber, chlorinated rubber, natural rubber can be used.

The infusion device of the present invention is used for locally injecting an injectable preparation such as a solution or suspension, or a paste-like semi-solid preparation in medical or dental treatment or preventive treatment. Can be used. For example, it can be preferably used for root canal filling of a dental paste composition. When using the injection device of the present invention, the drug 7
The inside of the main body 1 and the tip 3 is screwed into the plug 2 and then the piston 6 is pushed in, and the necessary amount of drug is put into the tube.
Discharge from the tip of 3c. When another patient is to be treated immediately after the treatment, the tip 3 is loosened, the tip 3 is removed, and then a new tip 3 is screwed onto the tube so that the drug is in the tube.
The next treatment is prepared by pushing the piston 6 to the tip of 3c. Chip 3 for temporary storage
Is loosened to remove the tip 3, and the storage tip 8 is screwed on.

[0027]

INDUSTRIAL APPLICABILITY The injection tool of the present invention has no fear of the tube falling off when injecting a highly viscous paste-like drug into the affected area, the cylinder tip portion is not bulky, and the operation is good even in the oral cavity. You can secure the sex. Further, it is convenient to exchange the tube for each treatment or to use a tube having a different tip shape according to various medical purposes. Furthermore, since a certain amount of drug is stored inside the chip, there is no direct contact between the drug inside the tube contaminated by the reverse flow of saliva and the drug inside the main body. By repeated use, the drug inside the main body can always be kept in a non-contaminated state.

[Brief description of drawings]

FIG. 1 is an exploded view showing a cross-sectional view of components of an injection device according to an embodiment.

FIG. 2 is a vertical cross-sectional view of the injection device of the embodiment in use.

[Explanation of symbols]

 A injection tool 1 cylinder body 1a flange 2 provided on the cylinder body 2 plug 2a through hole provided on the plug 3 tip 3a first through hole provided on the tip 3c tube 3d second through hole provided on the tip 5 filling Material 6 Piston 7 Drug 8 Storage tip 9 Packing

Claims (10)

[Claims] 1. A plug which is provided at a tip of a cylinder body, has a thread on an outer peripheral surface thereof, and has a through hole extending along an axis, and a tube which can be screwed to the plug and fixed to the tip. And a tip having a through hole extending therethrough. 2. A plug provided at the tip of a cylinder body, having a thread on the outer peripheral surface thereof, and having a through hole extending along the axis, a chip having a through hole which can be screwed into the plug and extends along the axis, And an injection device having a tube fixed to the tip of the tip. 3. The injection device according to claim 1, wherein the tube is replaceable by screwing the tip in and out. 4. The injection tool according to claim 1, wherein the tip and the tube are integrally molded of the same material. 5. The injection tool according to any one of claims 1 to 4, wherein the total volume of the through holes of the tip is in the range of 1 to 50 times the total volume of the hollow portion of the tube. 6. The medicine filled in the through hole of the tip prevents contact between the medicine filled in the through hole of the syringe body and the plug and the contaminated medicine stored in the tube. The injection device according to any one of claims 1 to 5, wherein: 7. The injection device according to claim 1, which is filled with a pasty medicine. 8. A storage tip that can be screwed onto the plug of the injection device according to any one of claims 1 to 7, and the injection device according to any one of claims 1 to 7. Infusion tool kit. 9. An agent for injecting a drug, comprising the injection device according to any one of claims 1 to 7 and the tip of the injection device according to any one of claims 1 to 7 as a replacement chip. kit. 10. The drug injection kit according to claim 9, further comprising the storage chip according to claim 8.