JP5101968B2 - Syringe - Google Patents

Description

  The present invention relates to a syringe used for treatment. In detail, it is related with the syringe used in order to discharge | emit high viscosity material.

  Conventionally, a photosensitive photosensitive filler has been used to repair a minute defect portion of a tooth. A method of polymerizing and curing the dental photosensitive filler by filling the minute defect portion with a dental photosensitive filler and then irradiating with an actinic ray is used.

When filling the defect with the dental photosensitive filler, a syringe-like instrument is used. Since the degree of freedom of operation is limited in order to perform the filling operation in the oral cavity, the filling operation of the photosensitive filler from the syringe-like instrument is performed outside the oral cavity. For this reason, it is necessary to provide a nozzle in a syringe-like instrument in order to fill the tooth filling with a photosensitive filler.

Many of these nozzles are bent so that their tips can easily reach the tooth defect. However, since the photosensitive filler is highly viscous, if the cross-sectional area of the nozzle suddenly decreases in the discharge direction (nozzle side) of the photosensitive filler, the shear stress of the photosensitive filler on the inner wall of the nozzle will be reduced. It becomes stronger rapidly and the efficiency of discharging the photosensitive filler is deteriorated.

  In view of this, there is one in which the nozzle portion is formed in a tapered shape so that the dental photosensitive filler can be easily extruded (Patent Document 1). By making the nozzle portion into a tapered shape, the rate of reduction of the cross-sectional area of the lumen that gradually decreases toward the tip is moderated. As a result, the rapid decrease in the cross-sectional area is suppressed, and the shear stress during extrusion applied to the inner wall of the dental photosensitive filler filled in the syringe is not suddenly applied.

JP 2000-107298 A

  However, when the shape of the nozzle provided at the tip of the syringe-like instrument is tapered as seen in the above document, the photosensitive filler discharged from the nozzle tip is not discharged directly below, and the nozzle tip The photosensitive filler may not be reliably discharged to the tooth defect portion because it is discharged in such a manner that it is wound around the outer peripheral surface of the tooth. Therefore, there is a need for an instrument that can reliably fill the tooth defect with the discharged photosensitive filler without lowering the discharge efficiency.

  An object of the present invention is to provide a syringe that is efficient in discharging a high-viscosity material and can be reliably discharged to a filling site.

  Therefore, as a result of intensive studies, the inventors have arrived at the following invention. A syringe used for treatment, a barrel having both ends open, a nozzle attached to the tip of the barrel and having a distal-end axis bent at an obtuse angle with respect to a proximal-end axis, and a proximal end of the barrel A plunger that is more inserted and slidable liquid-tightly within the barrel, and the lumen from the tip of the barrel to the tip of the nozzle has a tapered shape that decreases in diameter toward the tip, The tip of the nozzle is a syringe having a hollow frustoconical tip having no surface perpendicular to the axis on the nozzle tip side.

  Further, in the above-described syringe, the base end of the plunger is provided with an arcuate plate-like flange provided with a convex surface facing the base end.

  The tip position of the nozzle is the above syringe, which is a position that protrudes outward from the outer periphery of the barrel when viewed from the axial direction of the barrel.

When discharging a highly viscous material from the inside of the syringe by using the syringe, a hollow frustum-like shape having no surface perpendicular to the axis on the nozzle tip side provided at the tip of the tapered nozzle is provided. It is possible to suppress the behavior that the material inside the syringe wraps around the outer peripheral surface of the syringe tip at the time of discharge by the tip, and it is possible to reliably discharge the material to the portion to be originally filled. As a result, the present invention has been achieved. In addition, since the nozzle lumen is tapered, the cross-sectional area in the nozzle does not rapidly decrease toward the tip, and the discharge efficiency does not deteriorate.

  The syringe of the present invention can be suitably used for medical treatment because it is efficient when discharging a high-viscosity material and can be reliably discharged to a filling site.

  Hereinafter, the syringe of this invention is demonstrated using figures. However, the present invention is not limited to the exemplary embodiments described in these drawings.

  FIG. 1A is a longitudinal sectional view of an example of an embodiment of the syringe of the present invention, and FIG. 1B is a bottom view thereof. 2A is an enlarged view of the tip of the syringe of FIG. 1 and FIG. 2B is an enlarged view of the tip of the nozzle. FIG. 3 is a side view of a plunger provided in the syringe of FIG.

  The syringe of this invention is demonstrated using FIG. The barrel 1 has a hollow shape with both ends open, and has a connecting portion 11 provided with a screw thread for nozzle screwing at the tip, and a rectangular finger-hanging portion 12 projecting in all directions on the outer wall of the base end. ing. In the connecting portion 11, a tapered nozzle 2 that is bent with respect to the shaft near the middle and decreases in diameter toward the tip is connected to the connecting portion 11 by a screw groove provided on the inner wall of the base end of the nozzle. . A plunger 3 is accommodated in the barrel 1 so as to be slidable in a liquid-tight manner. The plunger 3 is provided with an O-ring 31 so that the plunger 3 can slide in a liquid-tight manner in the barrel 1, and the distal end shape of the plunger 3 is substantially the same as the space on the distal end side of the barrel. Has been. A flange 32 is formed at the base end of the plunger 3, and the flange 32 has an arcuate plate shape with a convex surface facing the base end side. As shown in FIG. 2 of the enlarged view, a tip portion is formed on the outer periphery of the nozzle tip.

  By having a hollow frustoconical tip at the nozzle tip that does not have a surface perpendicular to the axis on the nozzle tip side, the high-viscosity material extruded from the bending nozzle is affected by the nozzle tip. Because there is no, it is not discharged so as to wind. Therefore, it is possible to reliably fill the defect portion with the material.

  The material used for the syringe of the present invention is not particularly limited as long as it can be used as a syringe and does not react with the material filled in the syringe. Examples of the material used include propylene. In addition, when the material filled in the syringe is a photosensitive filler, it is only necessary to provide the syringe with light-shielding properties. A coating method may be used.

  As shown in FIG. 2, the nozzle 1 is formed in a tapered shape in each of the portions before and after the bending, and the bending angle is an angle formed by the axis on the proximal end side of the nozzle and the axis on the distal end side of the nozzle. It is sufficient if α forms an obtuse angle. The tip of the nozzle tip has an angle β formed by the axis on the nozzle tip side and the inclination of the nozzle tip, and an angle γ formed by the extension of the tapered outer peripheral surface on the nozzle tip side and the inclination of the nozzle tip. Both have an acute angle. Furthermore, the tip position of the nozzle is preferably a position that protrudes outward from the outer periphery of the barrel when viewed from the axial direction of the barrel.

  As shown in FIG. 3, the plunger 3 of the present invention has a distal end formed in substantially the same shape as a lumen (tapered shape) at the distal end of the barrel, and an O-ring 31 provided at the proximal end thereof. Is provided so as to be slidable in a liquid-tight manner. For this reason, even if the barrel is gradually reduced in diameter toward the tip, the material in the syringe can be discharged to the end. The plunger 3 has an arcuate plate-like flange 32 provided with a convex surface directed toward the base end, and a non-entry portion having an outer diameter larger than the inner diameter of the barrel on the distal end side of the flange, that is, on the proximal end side of the plunger. 33 is provided. When the flange is formed into an arcuate plate shape, when the material is pushed out, it fits into the thumb ball and is provided with a non-entry part, so that the force is applied between the finger hook part and the flange until the plunger is fully pushed into the barrel. Can be efficiently transmitted and material can be easily pushed out of the barrel. By adopting these configurations, when the material filled in the barrel has a high viscosity, the force is efficiently transmitted to the extrusion operation, which is preferable.

  Since the finger hook 12 protrudes in all directions, it is possible to turn the nozzle in the optimum direction by rotating the plunger. Efficient discharge is possible.

  As described above, the syringe of the present invention can be suitably used for medical treatment because it is efficient when discharging a high-viscosity material and can be reliably discharged to the filling portion.

(A) The longitudinal cross-sectional view of one embodiment of the syringe of this invention. (B) Bottom view of the syringe illustrated in (a). (A) The front-end | tip enlarged vertical cross section of the syringe of FIG. (B) Enlarged view of the tip of the nozzle. (A) The side view of the plunger with which the syringe of FIG. 1 was equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Barrel 11 Connection part 12 Finger hook part 2 Nozzle 21 Tip part 3 Plunger 31 O-ring 32 Flange 33 Non-entry part

Claims (3)

A syringe used for treatment,
A barrel open at both ends;
A nozzle attached to the barrel tip, the tip side axis being bent at an obtuse angle with respect to the base side axis;
A plunger inserted from the base end side of the barrel and capable of liquid-tight sliding in the barrel;
The lumen from the tip of the barrel to the tip of the nozzle is tapered to reduce the diameter toward the tip,
The tip of the nozzle is a syringe formed by forming a hollow frustoconical tip having no surface perpendicular to the nozzle tip side axis.   2. The syringe according to claim 1, wherein a proximal end of the plunger has an arcuate plate-like flange provided with a convex surface facing the proximal end.   The syringe according to claim 1 or 2, wherein a tip position of the nozzle is a position protruding outward from an outer periphery of the barrel when viewed from an axial direction of the barrel.

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