JP2015160636A - Spouting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inside plug capable of obtaining back suction easily and effectively.SOLUTION: A spouting device 1 comprises: a cylinder 2 filled with a paste material; a nozzle 7 provided at a tip part of the cylinder 2; a plunger 3 provided inside the cylinder 2 and movable back and forth inside the cylinder 2; an inside plug 4 for preventing leakage of the paste material, which is provided at the tip side of the plunger 3 and formed of an elastic material; a main seal part 22 which annularly protrudes outward in a radial direction of the cylinder 2 from a body part 21 of the inside plug 4, and closely contacts with the inner peripheral surface of the cylinder 2 at all times; and an auxiliary seal part 23 which is provided at an interval at the rear side of the main seal part 22, has an outer diameter slightly smaller than the inner diameter of the cylinder 2, and annularly protrudes outward in the radial direction of the cylinder 2 from the body part 21 of the inside plug 4.

Description

  The present invention relates to a dispenser that prevents the paste material from sagging from the tip of a nozzle after the paste-like material is dispensed from the nozzle.

  The caries teeth are treated by scraping the carious portion and filling the formed restoration site with a tooth restoration material paste and irradiating the oral cavity with light to photopolymerize it or by chemical polymerization as it is. This is done by curing.

As a filling tool for pastes and the like (hereinafter also simply referred to as paste) used for such dental restoration, a small amount of paste needs to be dispensed quantitatively, so the paste spout is nozzle-like at the tip. A syringe type paste dispenser comprising a protruding cylinder and a plunger inserted from the rear end opening of the cylinder is used.
There are two types of syringe-type paste dispensers that use an O-ring to maintain hermeticity in the cylinder, and one that uses an inner plug that plugs the cylinder into a plug shape, and uses an O-ring. Things are common.

In the type using an O-ring, an annular concave groove is formed around the vicinity of the tip of the plunger, and in the concave groove, an O-ring for sealing having an elastic property that the outer peripheral edge is in close contact with the inner peripheral wall of the cylinder. Is installed. And by pushing the plunger to the tip of the cylinder to a desired degree, the O-ring can maintain close contact with the inner peripheral surface of the plunger, and the internal pressure in the hollow portion of the cylinder can be increased, and the paste is repaired. The required amount is pushed out from the spout of the dispenser.
In the type using an inner plug, an inner plug that is in close contact with the inner peripheral surface of the cylinder is provided, and the front and rear of the cylinder are sealed with the inner plug. And by pushing the plunger to the tip of the cylinder to the desired extent, the outer peripheral surface of the inner plug can be brought into close contact with the inner peripheral surface of the plunger to increase the internal pressure in the hollow portion of the cylinder, and the paste is necessary for repair. As much as possible, it can be pushed out of the spout.

However, in the pouring of the tooth restorative material paste using such a pouring device, it has been a problem to improve the cutting of the paste at the pouring port after the necessary amount has been poured. That is, in such a paste dispensing, even after the plunger is stopped, a considerable internal pressure remains in the paste filled in the cylinder, and the paste outlet has a small diameter. The paste sometimes leaked from the spout. In particular, when a small-diameter member such as a syringe tip was used in combination, the leakage of the paste was significant.
The leakage of the paste not only impairs the quantitativeness of the amount of the paste dispensed, but also causes the drops to drop around unnecessarily and contaminate the surroundings.

At this time, since the O-ring type slides while closely contacting the inner peripheral wall of the plunger, when the pressing force of the plunger is released, the O-ring type is based on a form deformed by elastic variation when it is pushed forward. There is a repulsive force to return to the position, and the plunger can be returned backward by that amount (hereinafter, this return is called back suction).
However, by simply mounting the O-ring in the concave groove, an appropriate back suction cannot be obtained, and further, the O-ring is twisted or twisted, causing leakage of the paste material to the plunger side. It was.

JP 2006-204628 A JP 2008-18351 A

Therefore, for the O-ring type, the following countermeasures as described in Patent Documents 1 and 2 are taken.
In the dispenser of Patent Document 1, an annular concave groove is formed around the vicinity of the tip of the plunger, and an elastic O-ring for sealing is attached to the concave groove, and the O-ring has a maximum diameter. A plurality of protrusions projecting toward the rear wall surface side of the concave groove (the surface facing the front side of the plunger) are spaced from each other on the rear end surface of the O-ring. Is formed. With such a configuration, the dispenser prevents twisting and twisting of the O-ring by causing a plurality of protrusions to abut against the rear wall surface of the concave groove when the paste is dispensed. Has gained back suction.

Further, in the dispenser of Patent Document 2, an annular concave groove is formed around the vicinity of the distal end of the plunger, and an elastic O-ring for sealing is attached to the concave groove. On the rear wall surface side of the concave groove of the plunger, a convex portion that extends in the four directions radially outward and protrudes to the front side of the dispenser is formed. When the plunger is pushed in, the convex portion and the O-ring Are in contact with each other, and the O-ring is filled in the gap between the convex portions. When the plunger is released, the elastically displaced O-ring tries to restore the original shape while maintaining the position with respect to the cylinder, and the restoring force causes the plunger to slide in the direction opposite to the pushing direction. It is disclosed that a negative pressure is generated therein and the contents present in the dispensing nozzle are drawn into the filling space.
Thus, in the O-ring type, conventionally, various modifications have been made to the shape of the O-ring or the cylinder in order to obtain back suction. However, another member is still required and the cost is high, and there are problems such as complicated installation of a minute O-ring.

On the other hand, in the case of the inner plug type, the actual situation is that only the shape recovery after the elastic deformation of the inner plug is mainly entrusted, and sufficient measures have not yet been taken regarding the back suction.
Then, this invention is made | formed by such a situation, Comprising: It aims at providing the extraction device provided with the inside plug which can obtain a back suction easily and effectively.

In order to achieve the above object, the present invention provides a cylinder filled with a paste material, a nozzle provided at the tip of the cylinder, and a plunger disposed inside the cylinder and capable of moving back and forth in the cylinder. In the dispenser comprising an inner plug disposed on the distal end side of the plunger and formed of an elastic material, the inner plug has a main body portion pressed when the plunger is advanced, and a main body portion of the inner plug A main seal portion that protrudes radially outward from the cylinder and that is always in close contact with the inner peripheral surface of the cylinder, and is provided with a space behind the main seal portion and slightly outside the inner diameter of the cylinder. An auxiliary seal portion that is formed with a small diameter and protrudes radially outward of the cylinder from the main body portion of the inner plug, and when the plunger advances, the main seal portion bends backward, When the pressure is released, the auxiliary seal part returns to its original shape, and the auxiliary seal part is brought into close contact with the inner peripheral surface of the cylinder due to the expansion of the auxiliary seal part due to the compression and expansion of the main body part. It was formed so that the close contact state of the auxiliary seal part was released by returning the shape of the main body part.
In the dispenser, the position where the auxiliary seal portion is formed is preferably the same as the front end of the plunger or disposed in front of the front end.
In the dispenser, the distance between the main seal portion and the auxiliary seal portion is preferably 1 to 4 mm.
In the dispenser, the difference between the inner peripheral diameter of the cylinder and the outer peripheral diameter of the auxiliary seal portion is preferably 0.1 to 2 mm.
In the dispenser, it is preferable that the main seal portion and the auxiliary seal portion protrude in a pleated shape outward in the radial direction of the cylinder.
The main seal portion is adjacent to a front surface having a surface perpendicular to the axial direction of the cylinder body and a rear surface having a tapered surface whose diameter decreases from the front surface to the rear side, and the auxiliary seal portion is from the front to the rear side. It is preferable that the front surface having a tapered surface whose diameter increases toward the surface and the rear surface perpendicular to the axial direction of the cylinder body are adjacent to each other.
The cylinder is not limited to a cylindrical shape, and an elliptical or polygonal one can be used. In this case, the outer peripheral shape of the inner plug or plunger is formed to be similar to the inner peripheral shape of the cylinder, It is necessary to ensure hermeticity against the inner peripheral surface of the cylinder. In this case, the meaning of the outside of the cylinder of the main body of the present invention in the radial direction with respect to the elliptical or polygonal inner plug is from the outer peripheral surface of the main body toward the radial direction from the central axis of the ellipse or polygon. Also outside.
In the inner plug, the main seal part and the auxiliary seal part project in an annular shape from the main body part. The parts projecting radially outward from the outer peripheral surfaces of the main seal part and the auxiliary seal part continue in a string shape. It is formed around the main body. Accordingly, when the main body portion is discarded, the main seal portion and the auxiliary seal portion become an endless ring.

  The dispenser of the present invention has a main seal portion that protrudes in an annular shape from the inner portion of the inner plug to the outside in the radial direction of the cylinder, and that is always in close contact with the inner peripheral surface of the cylinder, with a space behind the main seal portion. And an auxiliary seal portion that is formed to have an outer diameter slightly smaller than the inner diameter of the cylinder and project annularly from the main body portion of the inner plug to the outside in the radial direction of the cylinder. Therefore, when the paste has been dispensed and the pressing of the plunger member is stopped, the outer peripheral edge of the main seal portion that has been bent backward acts a restoring force that tries to return the deflection to the initial state, and as a result, the inner plug And the plunger is pushed back a little by a small amount. The pushing back force of the inner plug and the plunger acts as a force for pulling the paste into the cylinder member at the paste spout (back suction). Therefore, after the paste is stopped, the paste is discharged from the paste spout. Leakage can be suppressed satisfactorily.

It is the top view which looked at the pouring device by the embodiment of the present invention from the upper part (note that only a cylinder is made into a section. Hereinafter, Drawings 2-4 are also the same). FIG. 2 is an enlarged plan view of a plunger tip portion of the dispenser of FIG. 1, A is before discharging a paste (before plunger pressing pressure), B is discharging (middle plunger pressing pressure), C is after discharging (plunger It is an enlarged plan view after pressing pressure release (the paste which is the contents is omitted). It is the modification (modification 1) of the extractor of this invention, and is the top view which looked at the extractor which formed the cylindrical surface between the main seal part and the auxiliary seal part from the upper direction. It is a schematic sectional drawing which shows the aspect ratio of the main seal part and the auxiliary seal part which carried out the shape of the tongue piece shape. It is sectional drawing which shows the aspect ratio and the shape of a triangular main seal part and an auxiliary seal part. It is a top view of the plunger and inner plug of the extractor by the modification (modification 2) of the dispenser of the present invention. It is a modification (modification 3) of the extractor of the present invention, and is a plan view of an extractor having two cylinders.

Hereinafter, an extractor according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of a paste dispenser as viewed from above according to an embodiment of the present invention.
The dispenser 1 includes a cylinder 2, a plunger 3, and an inner plug 4, and further includes a lid (not shown).
The cylinder 2 has a cylinder body 6 having a cylindrical shape and a hollow interior, and a nozzle 7 having a paste outlet 8 formed at the tip is projected forward from the tip. An opening 10 is formed at the rear end of the cylinder 2, and a plunger 3 is inserted from the opening 10. Here, the inner diameter of the inner peripheral surface 11 of the cylinder body 6 is 3 to 40 mm, and although it depends on the material of the inner plug 4, it is generally 4 to 20 mm because a back suction mechanism can be easily obtained. The cross-sectional shape and size of the cylinder are not limited, and may be circular, elliptical, or polygonal.

The shape of the nozzle 7 is not particularly limited, but is preferably reduced in diameter so that the paste can be poured out quantitatively. That is, it is preferable that the nozzle 7 has a thin conical shape having a gentle taper or a thin cylindrical tube shape. The inner diameter of the paste spout 8 of the nozzle 7 is about 0.1 to 2.0 mm. The shape of the nozzle 7 may be bent halfway. In addition, the nozzle 7 provided with such a paste spout 8 may be formed as a separate chip-like member from the cylinder body 6 and connected to the cylinder body 6 for use.
A tapered portion 9 is formed between the nozzle 7 and the cylinder body 6 so as to correspond to the front side shape of the inner plug 4 described later. The front side shape of the tapered portion 9 or the inner plug 4 is not particularly limited. However, when the shape of the front side tapered portion 9 of the inner plug 4 is the same as shown in FIG. 1, generally expensive dental materials can be discharged to the end. This is a preferred embodiment.
On the outer peripheral wall of the rear end opening 10 of the cylinder main body 6, there is a finger holding portion 12 for hooking a finger (usually an index finger and a middle finger) when the operator holds the cylinder 2. It is formed so as to project in two directions. The finger holder 12 may be formed in an appropriate shape such as an annular shape or a rectangular shape so as to be easily held.

On the other hand, the plunger main body 13 of the plunger 3 is described in a columnar shape formed so as to substantially match the inner diameter of the cylinder main body 6 in the drawing. The cross section of the plunger body 13 may be the same circle as in the drawing, or may be an oval shape or a cross shape. When the plunger main body 13 is thinner than the cylinder main body 6, the plunger may become unstable at the time of discharge. Therefore, one or a plurality of guide portions that substantially coincide with the inner diameter of the cylinder in order to stabilize the posture at the time of discharge. Can be provided.
The plunger main body 13 and the guide portion are guided by the inner peripheral surface of the cylinder main body 6, and the hollow portion of the cylinder main body 6 can be moved back and forth stably. When the plunger main body 13 or the guide portion moves back and forth, contact with the cylinder inner surface 11 may cause resistance when discharging. In this case, the distance between the plunger 13 and the guide portion and the cylinder inner diameter can be adjusted as appropriate.
A pressing portion 17 that presses the inner plug 4 is formed at the distal end portion of the plunger main body 13.
At the rear end of the plunger 3, a finger contact portion 14 of the thumb flat is formed so as to protrude in two directions outside the plunger 3 so that the plunger 3 can be easily pushed into the hollow portion of the cylinder body 6. . The thumb flat finger holder 14 can be arbitrarily set to be circular or polygonal.

The cylinder 2 and the plunger 3 are made of a material that is not deformed as compared with the inner plug, such as polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyethyl ether ketone, nylon and fluorocarbon resin, glass, metal, etc. On the other hand, the inner plug 4 is formed of an elastic member capable of elastic deformation.
Here, the elastic deformation refers to a deformation in which an object deformed by an external force returns to its original shape (or a relaxed shape) when the external force is removed (or loosened).
In the present embodiment, the inner plug 4 has a main body portion 21 having a conical shape on the front end side and a cylindrical shape on the rear end side, a main seal portion 22 formed on the outer periphery of the main body portion 21, and a space behind the main seal portion 22. And an auxiliary seal portion 23 that is disposed by opening. Therefore, the main body 21 is formed by removing the main seal portion 22 and the auxiliary seal portion 23. More specifically, a portion inside the outer periphery of the main body portion 21 indicated by a chain line 21 a in FIG. 2 becomes the main body portion 21, and portions outside the outer periphery 21 a become the main seal portion 22 and the auxiliary seal portion 23. In this embodiment, a V-shaped groove 25 is formed between the main seal portion 22 and the auxiliary seal portion 23. However, in addition to the V-shaped groove 25, a rectangular groove or a trapezoidal groove may be used. The surface may be rounded. FIG. 3 shows a state in which the trapezoidal groove 26 is formed in the inner plug 4 (Modification 1). In FIG. 3, the portion inside the outer periphery 21 a indicated by the solid line and the chain line is the main body portion 21 of the inner plug 4, and the portions outside the outer periphery 21 a are the main seal portion 22 and the auxiliary seal portion 23.

Among the above forms, the V-shaped groove 25 is most preferable from the viewpoint of improving the back suction function and the sealing property, and the angle of the V-shaped groove 25 is preferably 40 to 130 °, particularly 70 to 110 °. Is preferred. In the back suction mechanism according to the present invention, a pleat shape to be described later is important. When the angle is larger than the above range, the above pleat shape is not obtained, so that the back suction function is lowered. Further, since the distance between the main seal portion 22 and the auxiliary seal portion 23 is increased, the effect of improving the sealing performance in cooperation is reduced.
When the angle is smaller than the above preferred range, there is no space between the main seal portion and the auxiliary seal portion, so the main seal portion cannot be sufficient and the back suction mechanism does not function sufficiently.
As described above, the front end of the main body 21 has a shape corresponding to the tapered portion 9 on the front side of the cylinder main body 6, and can sufficiently extrude the material of the filling chamber 15 so as not to waste expensive dental material. It is formed as follows.

The main seal portion 22 and the auxiliary seal portion 23 have a shape that protrudes in an annular shape from the peripheral surface of the main body portion 21 to the outside in the radial direction of the cylinder, and the shapes of the main seal portion 22 and the auxiliary seal portion 23 are back suction. Since it directly affects, for example, a suitable amount of back suction may be adjusted by changing the length in the radial direction, or may be adjusted by changing the thickness (thickness in the longitudinal direction of the cylinder).
The main seal portion 22 can be formed integrally with the front surface of the main body portion 21. For example, as shown in FIG. 1, the front surface which is a conical portion of the main body 21 and the main seal portion 22 are integrated. Further, as shown in FIG. 1, the auxiliary seal portion 23 can also be formed integrally with the rear surface of the main body portion 21. In this case, the main seal portion 22 and the auxiliary seal portion 23 are portions protruding from the cylindrical portion with the circumferential portion on the rear side of the main seal portion as a base point.

In this embodiment, the example which protrudes circularly or triangularly is shown.
The cross-sectional shapes of the main seal portion 22 and the auxiliary seal portion 23 protruding in an annular shape shown in FIG. 4 are semicircular or semielliptical. The cross-sectional length of the main body 21 (or cylinder body 6) in the axial direction (front-rear direction) of the main body 21 (or cylinder body 6) in the cross-sectional shape when no load is applied to the seal part is set to be horizontally long. The cross-sectional length to the outer side in the radial direction of the main body 6) was set to be vertically long. If the aspect ratio is 0.5, it becomes a semicircular 22i (23i), and if it exceeds 0.5, it becomes a vertically long shape. The pleated shape refers to an elongated crease shape, and the pleated shape in the present invention includes an arc shape or an elliptical arc shape shown in FIG. 4 and a triangular shape shown in FIG. As described above, it is desirable that the aspect ratio of the pleat exceeds 0.5.

The range in which the back suction is suitable for the ratio of the aspect ratio (vertical / horizontal) was examined.
Back suction when the ratio of the aspect ratio (vertical / horizontal) exceeds 0.5 times for the size of the cylinder body 6 (inner diameter is 4 to 20 mm) that is generally used for tooth restoration material paste Tends to be effective, and conversely, if it exceeds 2.0 times, a tendency to lower the sealing property is recognized. Accordingly, the aspect ratio is preferably in the range of 0.6 to 2.0, such as the main seal portions 22a to 22e and the auxiliary seal portions 23a to 23e, and the main seal portions 22b to 22d and the auxiliary seal portions 23b to 23d Thus, the range of aspect ratio 0.7-1.5 is especially preferable.
The cross-sectional shapes of the main seal portion 22 and the auxiliary seal portion 23 protruding in an annular shape shown in FIG. 5 are triangular. By making such a triangular shape as shown in each shape of FIG. 5, the contact area and resistance with the cylinder body 6 are reduced and the feeling of extrusion is reduced compared to a semicircular shape or a semielliptical shape. There is. Further, since the bend of the seal portion is improved, the back suction mechanism described later functions effectively, which is preferable. In this respect, it is preferable that the seal portions 22 and 23, including the circular one shown in FIG. 4, are tapered from the proximal end side toward the distal end side.

Specifically, there are an isosceles triangular main seal portion 22f and auxiliary seal portion 23f with a sharp tip, and an isosceles triangle main seal portion 22g and auxiliary seal portion 23g with a circular tip. When the tip is circular, the radius of curvature (R) of the tip (outer edge portion) is in the range of 0.1 to 0.4 mm, particularly preferably in the range of 0.2 to 0.3 mm. When the radius of curvature (R) is too small, the sealing performance may be slightly lowered, and when the radius of curvature (R) is too large, the resistance may increase and the ejection feeling may become heavy.
Among the triangular shapes, the most preferable shape is a combination of the main seal portion 22h and the auxiliary seal portion 23h in FIG. The main seal portion 22h has a right triangular cross section in which a front surface having a surface perpendicular to the axial direction of the main body portion 21 (or the cylinder main body 6) and a rear surface having a tapered surface whose diameter decreases from the front surface to the rear side are adjacent to each other. The auxiliary seal portion 23h has a front surface having a tapered surface whose diameter increases from the front toward the rear side, and a surface perpendicular to the axial direction of the main body portion 21 (or the cylinder main body 6), and on the rear side of the front surface. It is a right-angled triangular cross section adjacent to the rear surface.

By making the front surface of the main seal portion 22h and the rear surface of the auxiliary seal portion 23h at right angles to the axial direction of the cylinder body 6, compared to the case where both the front surface and the rear surface are tapered, it is possible to discharge the paste. It becomes easy to spread in a right angle (radius) direction at the time of pressurization, and the sealing performance is most improved. Furthermore, since the space between the main seal part 22 and the auxiliary seal part 23 becomes wide and the main seal part can be sufficient, the effect of the back suction mechanism described later is further enhanced.
In the triangular shape shown in FIG. 5, the aspect ratio is preferably in the range of 0.6 to 2.0, particularly preferably in the range of 0.7 to 1.5 for the same reason as described above.

  The main seal portion 22 and the auxiliary seal portion 23 are disposed adjacent to each other, the outer diameter of the main seal portion 22 is formed larger than the diameter of the inner peripheral surface 11 of the cylinder 2, and the outer diameter of the auxiliary seal portion 23 is the inner periphery. It is formed smaller than the diameter of the surface 11. In this embodiment, the position where the auxiliary seal portion 23 is formed is the same as the distal end portion of the plunger 3 in a state where the plunger 3 and the auxiliary seal portion 23 are in contact with each other. It may be formed on the front side of the position where the plunger 3 presses the inner plug 4. Therefore, the inner plug 4 may have a shape in which the main body portion 21 protrudes behind the auxiliary seal portion 23.

  In addition, as shown in FIG. 6, there is a case in which a recess 26 is formed in the center of the rear end side of the inner plug 4. The plunger 3 used for the inner plug 4 has a multi-stage structure in which the front portion is convex and the step is enlarged in the rear direction, and the convex portion 25 is embedded in the concave portion 26 formed in the central portion of the inner plug 4. Then, the tip of the convex portion 25 is inserted into the through hole 27 communicating with the concave portion 26. In such a type, the auxiliary seal portion 23 is pressed by the second-stage pressing portion 17 a and / or the third-stage pressing portion 17 b of the plunger 3. In these cases, the distal end portion of the plunger is located on the front side of the auxiliary seal portion, but since the pressing portion 17b and the auxiliary seal portion 23 are in contact with each other, the distal end portion of the plunger 3 is at the same position as the auxiliary seal 23. Although it is slightly inferior to a certain case, the back suction described later functions (Modification 2). In addition, there is an advantage that the plunger and the inner plug can be firmly fixed.

  1 and 2, the pressing portion 17 of the plunger 3 is formed smaller than the outer diameter of the inner plug 4 and the inner diameter of the cylinder body 6 in the present embodiment. 11 may be substantially the same as the inner diameter so that 11 can slide. That is, you may abbreviate | omit the press part 17 shown in FIG. However, the outer diameter of the plunger pressing portion 17 with respect to the inner diameter of the cylinder body 6 is preferably 50% to 95%. If it is less than 50%, the deflection of the inner plug 4 will increase and the risk of leakage of the paste to the rear will increase, and if it is 96% or more, the deflection of the inner plug will decrease and the back suction will tend to decrease slightly. is there.

In the paste dispenser having such a basic structure, the filling chamber 15 formed by the hollow portion on the front side of the cylinder 2 is filled with paste. An inner plug 4 is provided at the tip of the plunger body 13.
Accordingly, in a normal time when the pressing force is not applied to the plunger 3, in the paste dispenser 1, the filling chamber 15 on the tip side of the inner plug 4 is provided by the main seal portion 22, and the cylinder main body behind this. 6 is sealed, and the paste filled in the filling chamber 15 is prevented from flowing out toward the rear end opening 10 of the plunger 3. For this reason, when the operator of the dispenser 1 puts his / her finger on the finger holders 12 and 14 of the cylinder body 6 and the plunger 3 and pushes the plunger 3 to the tip of the cylinder 2 to a desired degree, the filling chamber The internal pressure of the paste filled in 15 increases, and accordingly, a required amount of paste can be pushed out from the paste spout 8.

The greatest feature of the present invention lies in that the auxiliary seal portion 23 is formed in the vicinity of the main seal portion 22 in the paste dispenser 1. In the dispenser 1 having a structure in which the main seal portion 22 and the auxiliary seal portion 23 are formed, as shown in the enlarged view of FIG. Is sealed by the main seal portion 22, while the paste is viscous, the diameter of the spout 8 of the nozzle 7 is small, and the internal pressure of the filling chamber 15 is increased.
When the internal pressure of the paste increases, a force to push back the inner plug 4 toward the rear end opening 10 side of the cylinder 2 works, and the inner plug 4 is located between the filling material (paste) and the pressing portion 17 of the plunger 3. Compressed. Due to such a compressive force, the inner plug 4 contracts in the front-rear direction and elastically deforms so as to expand in the radial direction.
In particular, when the auxiliary seal portion 23 is formed at the same position as the front end of the plunger 3 or at the front side of the front end, the main body portion 21 can be effectively expanded radially outward. .

  When the main seal portion 22 expands radially outward, the main seal portion 22 is further brought into close contact with the inner peripheral surface of the cylinder 2 to increase the sealing force, while the internal pressure of the paste is further increased. At this time, since the auxiliary seal portion 23 has an outer diameter slightly smaller than the inner peripheral surface 11 of the cylinder 2 at the initial stage of pressing, it does not hinder the bending of the main seal portion 22 effective for the back suction function. Further, when pressed by the pressing portion 17, the main body portion 21 expands radially outward, and the entire annular auxiliary seal portion 23 is in close contact with the inner peripheral surface 11. When the inner peripheral surface 11 of the auxiliary seal portion 23 is in close contact with each other, resistance is generated and deterioration of the sealing performance due to excessive bending of the main seal portion can be prevented. In the present embodiment, since the pressing portion 17 is slightly smaller in diameter than the main body portion 21, the distal end sides of the main seal portion 22 and the auxiliary seal portion 23 that are outside the pressing portion 17 are more easily bent backward.

  Further, when the paste is poured out, if the distance between the main seal portion 22 and the auxiliary seal portion 23 is narrow, the ends of the main seal portion 22 and the auxiliary seal portion 23 may be sealed together. Or it may be sealed separately. At this time, in the state where the tips are integrated with each other, both cooperate to improve the sealing force, and in the separated state, even if the paste leaks from the main seal portion 22, the main seal portion Since the internal pressure is not as large as between the filling chamber 15 and the auxiliary seal portion 23, the paste that has entered between them can be sufficiently sealed by the sealing force of the auxiliary seal portion 23 and leaks to the plunger 3 side. To prevent it. In particular, since both the main seal portion 22 and the auxiliary seal portion 23 are located on the front side of the tip position of the plunger 3, the main seal portion 22 and the auxiliary seal portion 23 can be in close contact with the inner peripheral surface 11 effectively.

When a desired amount of paste is supplied from the spout 8 and the plunger 3 is released, the paste has viscosity, so that the internal pressure remains in the filling chamber 15. Therefore, the paste may leak from the spout 8, but back suction is generated due to the presence of the inner plug 4, and the plunger 3 is returned backward.
That is, the inner plug 4 moves forward when the plunger 3 is pushed in, while the main seal portion 22 and the auxiliary seal portion 23 move forward, while the tip end portion is deformed to bend rearward, and the main body portion 21 of the inner plug 4 It moves forward slightly forward relative to the seal portions 22 and 23. When the pushing of the plunger 3 is released, the pushing force of the plunger 3 is released with respect to the inner plug 4 that has been compressed, and only the internal pressure on the filling chamber 15 side remains. At the same time, the distal end portion of the main seal portion 22 that has been bent to the rear side is brought into close contact with the inner peripheral surface 11 of the cylinder 2 so that the position of the distal end portion that has been in contact remains unchanged, and the bending is restored to the original shape. Then, the main body 21 that has been moved forward relative to the main seal portion 22 is pulled back to the rear side.

Since the front end portion of the auxiliary seal portion 23 is in close contact with the inner peripheral surface 11 when the load on the plunger 3 is released, the main body portion 21 is pulled back to the rear side only at the initial time. By reducing the diameter, the tip portion is separated from the inner peripheral surface 11. Since the contact of the auxiliary seal portion 23 is eliminated, the resistance for restoring the bending of the main seal portion 22 to the original shape is reduced, and the restoration becomes easy. That is, the main body portion 21 is quickly pulled back.
By causing the back suction in the filling chamber 15 by the relative movement of the main body 21, the internal pressure of the filling chamber 15 is reduced, and leakage of the paste from the spout 8 can be prevented. Furthermore, since this back suction occurs quickly, there is no difference in the time from release of the discharge pressure until the paste is pulled back, and the feeling of operation becomes very good.

  When the position of the auxiliary seal portion 23 is brought close to the position of the main seal portion 22 as shown in FIGS. 2A and 2B, the inventor increases the back suction. As shown in FIG. It has been found that when the distance L between the auxiliary seal portion 23 is increased, the back suction is reduced (however, a space for the main seal portion to bend is necessary). Accordingly, when the position of the auxiliary seal portion 23 is adjusted to increase the back suction, the auxiliary seal portion 23 is brought close to the main seal portion 22 to prevent air from being mixed from the discharge port 8 due to excessive back suction. In some cases, the main seal portion 22 and the auxiliary seal portion 23 may be separated from each other.

  The length L (FIG. 3) between the main seal portion 22 and the auxiliary seal portion 23 is preferably 1 to 10 mm, and particularly preferably in the range of 1 to 4 mm where both the back suction function and the sealability are good. This is because when the length L is larger than 10 mm, the back suction function does not function sufficiently, and when the length L is smaller than 1 mm, the sealing performance is deteriorated. Moreover, it is preferable that the difference of the inner peripheral diameter of a cylinder and the outer peripheral diameter of the said auxiliary seal part is 0.01-3 mm, 0.1-2 mm. When the difference between the cylinder inner peripheral diameter and the outer peripheral diameter is too small, the function of the back suction is reduced as in the case of a normal seal. When the difference is too large, the auxiliary seal 23 cannot be brought into close contact with the cylinder at the time of pressing, and the function of the present invention is not exhibited.

  The material of the paste dispenser of the present invention having the above structure is not particularly limited and may be metal, glass, or the like, but is usually plastic, for example, polypropylene, nylon, Teflon (registered trademark). Etc. are adopted. In addition, about the nozzle-shaped paste spout of the front-end | tip, when forming separately from a cylinder main body, you may use a different material from a cylinder main body. The material of the inner plug 4 is preferably an elastic material made of a synthetic resin such as a silicone resin or a fluorine elastomer. These elastic materials generally have a Shore hardness of 100 or less, more preferably 40-100.

Next, the paste to be filled in the paste dispenser 1 of the present invention is not particularly limited, but from the viewpoint of remarkably exhibiting the effect of the present invention that improves the cutting of the paste from the paste spout. Low viscosity is preferable, and the viscosity measured at 23 ° C. is preferably 10 to 10,000 poise, more preferably 50 to 5,000 poise.
In particular, the paste filling the paste dispenser 1 of the present invention is preferably a tooth restoration material paste. Specific examples of these tooth restorative pastes include missing tooth filling restoration materials called composite resins, adhesive materials called dental cements, back layer materials for dental pulp protection, and filling suitable for foveal cleft sealing. Examples include restoration materials. These may be of a type that is cured by chemical polymerization, may be of a type that is cured by photopolymerization, or may be a dual cure type that includes both.

  Tooth restorative material paste generally comprises a filler, a polymerizable monomer, and a photopolymerization initiator. In this case, the filler is not particularly limited, and organic and inorganic fillers are used without any limitation. Specific examples include borosilicate glass as an inorganic filler, glass containing heavy metals (for example, barium, strontium, zirconium), aluminosilicate glass, glass ceramics, composite inorganic such as silica, silica / zirconia, silica / titania, silica / alumina, etc. An oxide etc. are mentioned. Examples of the organic filler include homopolymers or copolymers of acrylic acid ester or methacrylic acid ester, polyvinyl chloride, polystyrene, and polyester polyamide.

The polymerizable monomer is not particularly limited, and a known radical polymerizable monomer generally used as a dental monomer can be used. Examples of the polymerizable monomer that can be suitably used include monofunctional and polyfunctional (meth) acrylate monomers.
As the photopolymerization initiator, known photopolymerization initiators that generate radicals upon irradiation with ultraviolet or visible light can be used without any particular limitation. Specific examples include camphorquinone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, bis (2,4,6-trimethylbenzoyl) phenylphosphine oxide, and the like.
Further, in addition to the photopolymerization initiator, a tertiary amine or the like may be added as a removal catalyst.
As the chemical polymerization initiator, known chemical polymerization initiators used for dental applications can be used without particular limitation. Specifically, a redox system of a peroxide such as benzoyl peroxide or hydroperoxide and a tertiary amine can be used.

The present invention has been described in detail based on the embodiments with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and other modifications can be made without departing from the scope of the present invention. Or it can be changed.
For example, the dispenser of the above embodiment has been described using a series of cylinders. However, as shown in FIG. 7, in the case of a two-paste mixed system, the cylinders are arranged side by side (multiple). It can also be used for things. It can also be used for a gun-type dispenser (including two stations) (Modification 3).
Moreover, in the said embodiment (and modification), although the plunger 3 and the inner stopper 4 are not connected integrally, a rod-shaped shaft member is attached to the plunger in the axial direction of the plunger from the tip center surface of the plunger. A hole with a bottom that accepts the shaft member is formed in the center of the rear end on the inner plug side in the axial direction of the inner plug. You may connect with a stopper. There is an effect that the position of the inner plug is stabilized in the center.

Further, for the inner plugs of the first modification (FIG. 3) and the second modification (FIG. 6), the material of the inner plug of the embodiment (FIG. 1, FIG. 2) can be formed of the same material, and the paste to be handled The same material can also be used, and the present invention can also be applied to a cylinder in which two cylinders are arranged side by side as shown in Modification 3 (FIG. 7). In addition, the inner plug of the second modification may be a rectangular groove, a trapezoidal groove or the like in addition to the V-shaped groove.
Furthermore, about the inside plug of the said embodiment and the modification 1-the modification 3, you may make the cross-sectional shape of a main seal part and an auxiliary | assistant seal part one, respectively, and make the other semicircular.

DESCRIPTION OF SYMBOLS 1 Dispenser 2 Cylinder 3 Plunger 4 Inner plug 6 Cylinder main body 7 Nozzle 8 Outlet 10 Opening 11 Inner peripheral surface 13 Plunger main body 15 Filling chamber 17 Press part 21 Main body part 22 Main seal part 23 Auxiliary seal part

Claims (6)

A cylinder filled with a paste material, a nozzle provided at the tip of the cylinder, a plunger disposed inside the cylinder and capable of moving back and forth in the cylinder, and an elastic material disposed on the tip side of the plunger In the dispenser provided with the inner plug formed in
The inner plug is a main body that is pressed when the plunger is advanced,
A main seal portion that protrudes radially outward of the cylinder from the body portion of the inner plug, and is always in close contact with the inner peripheral surface of the cylinder;
Auxiliary seal portion provided on the rear side of the main seal portion with an interval and having an outer diameter slightly smaller than the inner diameter of the cylinder and protruding outward in the radial direction of the cylinder from the body portion of the inner plug And
When the plunger moves forward, the main seal portion bends backward, and when the plunger is released, the main seal portion returns to its original shape.When the plunger moves forward, the auxiliary seal portion moves due to the compression and expansion of the main body portion. A dispenser formed so that the auxiliary seal portion is in close contact with the inner peripheral surface of the cylinder, and when the plunger is released, the auxiliary seal portion is released from the close contact state by returning the shape of the main body portion. .   The dispenser according to claim 1, wherein a position where the auxiliary seal portion is formed is the same as the front end of the plunger or disposed in front of the front end.   The dispenser according to claim 1 or 2, wherein an interval between the main seal portion and the auxiliary seal portion is 1 to 4 mm.   The dispenser according to any one of claims 1 to 3, wherein a difference between an inner peripheral diameter of the cylinder and an outer peripheral diameter of the auxiliary seal portion is 0.1 to 2 mm.   The dispenser according to any one of claims 1 to 4, wherein the main seal portion and the auxiliary seal portion protrude in a pleated shape outward in the radial direction of the cylinder.   The main seal portion is adjacent to a front surface having a surface perpendicular to the axial direction of the cylinder body and a rear surface having a tapered surface whose diameter is reduced from the front surface to the rear side, and the auxiliary seal portion is front to rear side. The dispenser according to any one of claims 1 to 4, wherein a front surface having a tapered surface whose diameter increases toward the surface and a rear surface perpendicular to the axial direction of the cylinder body are adjacent to each other. .

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