JPH0889515A - Syringe - Google Patents

Abstract

PURPOSE: To efficiently inject a treating material, such as dental paste and root canal filler, filled into a cylinder and to make the residual amt. in this cylinder as small as possible. CONSTITUTION: The front end of a plunger shaft 8 is provided with an ejection tip 10 consisting of a flexible material such as elastomer. This extruding tip 10 is bent in a cannula part 4 to eject the treating material encapsulated the cylinder as much as possible to lessen the residual amt. at the time of extruding the treating material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a syringe capable of efficiently using a viscous dental or medical treatment material (hereinafter referred to simply as "treatment material") such as a liquid or a glue root canal filling material. , Especially for disposable syringes.

[0002]

2. Description of the Related Art In recent years, a syringe of this type, particularly a disposable type, is composed of a plastic molded cylinder and a plunger, and a therapeutic material is contained in the cylinder in an amount required for one treatment. A lot of products that have been encapsulated are being used.
A technical problem at present in this type of syringe is that a large amount of the therapeutic material is wasted. In other words, even if the plunger is pushed all the way into the cylinder and the treatment material is injected, the volume equivalent to the volume of the cannula portion provided at the tip of the cylinder will not necessarily be pushed out and will remain, making it more than the amount necessary for one treatment. However, since it is necessary to fill the cylinder in an extra amount, and the excess therapeutic material is inevitably discarded, it is impossible to use the therapeutic material efficiently. is there.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a syringe capable of injecting as much therapeutic material as possible enclosed in a cylinder as much as possible and reducing the remaining amount.

[0004]

In order to achieve the above object, a syringe according to the present invention comprises a cylinder having a hollow portion filled with a therapeutic material and a cannula portion for injecting a therapeutic material connected to the tip of the hollow portion, and It consists of a plunger that inserts a plunger shaft into the hollow part and injects the therapeutic material from the cannula part.At the tip of the plunger shaft, a push-out part that is pushed into the cannula part when the therapeutic material is injected is provided, and the push-out part is provided. The structure is made of a flexible material that is deformable along the inner surface shape of the cannula portion.

The syringe according to the present invention may be arranged such that the pushing portion is a pushing tip made of an elastomer material fixed to the tip of the plunger shaft.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are cross-sectional views showing an embodiment of a syringe according to the present invention. As shown in FIGS. 1 and 2, the syringe of this embodiment mainly includes a cylinder 1 for enclosing a therapeutic material,
And a plunger 2 for pushing the therapeutic material out of the cylinder 1. Although the syringe according to the present embodiment will be described below as one for injecting and injecting a dental treatment material, it goes without saying that the present invention is not limited to such an application. The syringe according to the present invention has the shape of the illustrated embodiment,
It is obvious that the syringe is not limited to those having dimensions and structure, and can be applied to syringes of various aspects.

The cylinder 1 is formed by molding a plastic material into a hollow cylindrical shape, and has a hollow portion 3 for enclosing a dental treatment material, for example, a treatment material such as a paste-like root canal filling material, and a hollow portion. And a cannula 4 for injecting a therapeutic material, which is connected to the distal end of the portion 3. The hollow portion 3 has a finger collar 5 formed at the end opposite to the cannula portion 4, and an insertion opening 6 is provided at the center thereof. The distal end side of the cannula portion 4 is bent in the axial direction of the hollow portion 3 so that the work in the patient's oral cavity can be easily performed. On the other hand, the plunger 2 includes a thumb pad 7 and a plunger shaft 8,
The plunger shaft 8 is equipped at its tip with a push-out tip 10 for pushing out the therapeutic material from the cannula portion 4.

The extruded tip 10 is made of a synthetic resin such as Tuftec (trademark; manufactured by Asahi Kasei Corporation) or an elastomer such as elastic plastic. The extruded tip 10 is formed so that its tip portion is slightly thin and has a base portion. Is fixed to the projection 9 at the tip of the plunger shaft 8. As shown in FIG. 3, the length of the extrusion tip 10 is longer than the dimension of the portion of the cannula portion 4 that extends in the direction coaxial with the plunger shaft 8. The length and material may be selected in relation to the viscosity of the therapeutic material to be extruded, and when the therapeutic material is liquid, the extrusion tip 10
Is made of a very flexible material, and when the injection is completed, the tip 10 is extruded up to near the tip of the cannula part 4.
It is better to reach the tip of. When the therapeutic material is a material having a relatively large viscosity, such as a dental root canal filling material, the plunger 2 is inserted into the cylinder 1 after the therapeutic material is filled, and therefore the extrusion tip 10 is used.
It is also necessary to consider that if the hardness is too soft, the insertion of the plunger 2 into the cylinder 1 will be hindered. Further, the plunger shaft 8 is provided with a stopper portion 11 on the thumb pad 7 side for limiting the insertion dimension of the cylinder 1 into the hollow portion 3 and the cannula portion 4.

In a syringe used for injection and injection of a dental root canal filling material, as shown in FIG. 1, the therapeutic material A is tightly sealed in the cylinder 1 from the tip of the plunger shaft 8 to the cannula portion 4. As a state, the therapeutic material A is injected, and the therapeutic material A is filled from the cannula portion 4 to a necessary treatment site. Specifically, from the state shown in FIG. 1, an operator such as a dentist operates the finger collar 5 and the thumb pad 7 to push the plunger 2 into the cylinder 1 until the stopper portion 11 contacts the finger collar 5, and the cannula 1 An amount of the therapeutic material required for one treatment is injected from the tip of the portion 4, and the remaining amount of the therapeutic material is as shown in FIG.
Only a slight amount remains in the portion of the extra-fine diameter on the tip side of the cannula 4 where the tip of 0 does not reach.

Of course, the form of the extruding tip 10 is not limited to that of the illustrated embodiment, and the mounting structure to the plunger shaft 8 may adopt various other structures including integral molding.

[0011]

As described above, in the syringe according to the present invention, since the push-out portion made of the flexible material is provided at the tip of the plunger shaft, more therapeutic material can be ejected from the cannula portion. As a result, it is possible to efficiently use a treatment material that has been wasted, such as remaining in the cannula portion and being discarded as it is.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a syringe according to the present invention in which a therapeutic material is enclosed.

FIG. 2 is a cross-sectional view showing a state where a therapeutic material is injected in the syringe of FIG.

FIG. 3 is an enlarged partial sectional view showing an extrusion tip inserted into a cannula portion in the syringe of FIG.

[Explanation of symbols]

 1 Cylinder 2 Plunger 3 Hollow Part 4 Cannula Part 5 Finger Collar 6 Insertion Hole 7 Thumb Aim 8 Plunger Shaft 9 Plunger Shaft Tip Protrusion 10 Push-out Tip 11 Stopper Part

Claims (2)

[Claims] 1. A cylinder having a hollow portion filled with a therapeutic material and a cannula portion for injecting a therapeutic material which is continuous with a tip of the hollow portion, and a plunger shaft is inserted into the hollow portion to inject the therapeutic material from the cannula portion. And a push-out portion that is pushed into the cannula portion at the time of injection of a therapeutic material at the tip of the plunger shaft, and the push-out portion is formed of a flexible material that is deformable along the inner surface shape of the cannula portion. A syringe characterized by being formed. 2. The syringe according to claim 1, wherein the push-out portion is a push-out tip made of an elastomer material and fixed to the tip of the plunger shaft.