JP6334975B2 - Dispenser and filling method of paste material into dispenser - Google Patents

Description

The present invention relates to a dispenser that prevents the paste material from sagging from the nozzle tip after the paste material is poured out from the nozzle after filling with the paste material (hereinafter also referred to simply as paste) , and a paste-like material to the cylinder. The present invention relates to a paste material filling method for an extractor capable of extracting air from a cylinder when filling the inside.

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.

In addition, 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. Is generally used (Patent Document 1, Patent Document 2).
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 the 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 by a seal portion formed on the inner plug. And by pushing the plunger to the tip of the cylinder to a desired extent, the outer peripheral surface or the seal portion of the inner plug is in close contact with the inner peripheral surface of the plunger, so that the internal pressure in the hollow portion of the cylinder can be increased. The paste can be pushed out of the spout as much as needed for repair.
This plug type has the advantage of having a stable posture at the time of filling and dispensing because it does not deform if a hard material is used as the material of the plug, but it is resistant to the inner peripheral surface of the cylinder. However, there is a drawback that the discharge feeling becomes worse. On the other hand, an elastic material for the inner plug has the disadvantage of having an unstable posture at the time of filling and dispensing, but has the advantage of being smooth against the inner peripheral surface of the cylinder and having a good discharge feeling. .

  When injecting the paste material into such a dispenser, the paste material is injected into the cylinder from the nozzle side with a plunger or an inner plug provided with an O-ring in the cylinder. Since the O-ring of the plunger and the seal portion of the inner plug are in close contact with the inner peripheral wall of the cylinder, the plunger and the inner plug are pushed by the paste material as the paste material is filled into the cylinder. Retreat inside. However, in the initial state, depending on the tip and shape of the nozzle, a space is formed between the inner plug and the nozzle, so that air remains in the gap at the tip of the cylinder. Therefore, when the paste material is injected into the cylinder with air remaining, the residual air becomes bubbles after the filling, and is mixed into the paste material. When bubbles remain in the paste material, there is a problem that the quality as a dental restoration material is lowered.

Moreover, in the extraction of the tooth restorative material paste using such an extractor, it has been a problem to improve the cutting of the paste at the outlet after the required amount has been extracted. 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.
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. In particular, when bubbles remain in the paste material as described above, there is a problem that the leakage of the paste is particularly remarkable because the air is compressed and the internal pressure is increased.

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 2011-004775 A JP 2006-204628 A

As described above, the inner plug type has the advantage of having a stable posture at the time of filling and dispensing because it does not deform if a hard material is used as the material, but with respect to the inner peripheral surface of the cylinder There is a drawback that resistance increases and discharge feeling becomes worse.
Therefore, the present invention provides a dispenser having a good discharge feeling and a paste filling method for the dispenser while maintaining a stable posture even when using an inner plug type. Objective.

Further, in the dispenser of Patent Document 2, 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. The outer peripheral surface having a diameter abuts the inner peripheral wall of the cylinder, and 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 the rear end surface of the O-ring. Open and 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.
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.
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.

Accordingly, a second object of the present invention is to provide a pouring device equipped with an inner plug capable of easily and effectively obtaining back suction and a method for filling the pouring device with paste.
As described above, when the paste material is injected into the cylinder with air remaining, the residual air becomes bubbles after the filling, and is mixed into the paste material.
Therefore, the present invention provides a dispenser that makes it easy to remove air from the cylinder and a method for filling the paste into the dispenser in order to improve the quality of the paste material as a dental restoration material and prevent leakage of the paste material. This is the third purpose.

In order to achieve the above object, the dispenser of the present invention has a cylinder provided with a filling chamber filled with a paste material, a nozzle provided at the tip of the cylinder, and the cylinder disposed inside the cylinder. A plunger that can move back and forth inside,
An dispenser comprising an inner plug disposed on the distal end side of the plunger and preventing leakage of the paste material, wherein the inner plug is disposed on the front plug disposed on the front side and on the rear side of the front plug. and a stopper after being set, the rear plug is formed of an elastically deformable material, said front plug is formed of a hard rigid material than the rear plug, the front plug, the maximum diameter of the cylinder Formed slightly smaller than the inner diameter,
The rear plug has a main seal portion whose outer peripheral surface is always in close contact with the inner peripheral surface of the cylinder, and when the paste material is filled in the cylinder, only the front plug is disposed in the cylinder, When the material was poured out, the rear plug was arranged behind the front plug.
The front plug of the dispenser is formed with a fitting hole from the center of the rear end surface toward the front, and the rear plug is formed with a body portion that fits into the fitting hole. An axial groove for removing air or bubbles from the filling chamber is formed on the inner peripheral surface of the inner circumferential surface, and the axial groove can communicate with the insertion hole.
The rear plug of the dispenser includes a main body portion that is pressed when the plunger is advanced, and a main seal portion that protrudes in an annular shape from the main body portion outward in the radial direction of the cylinder, and is always in close contact with the inner peripheral surface of the cylinder. And an outer diameter that is slightly smaller than the inner diameter of the cylinder and protrudes in an annular shape from the inner portion of the inner plug to the outer side in the radial direction of the cylinder. An auxiliary seal portion, and when the plunger moves forward when the paste material is dispensed, the main seal portion bends backward, and when the plunger is released, the main seal portion returns to its original shape, and the auxiliary seal portion Is in close contact with the inner peripheral surface of the cylinder due to the radial expansion of the auxiliary seal portion due to the compression and expansion of the main body, and when the plunger is released, the shape of the main body is restored. Can be formed as close contact of the auxiliary seal portion is released.
The inner plug of the dispenser is made of one resin material selected from polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyethyl ether ketone, nylon, and fluorocarbon resin, and the rear plug is It is preferably made of a soft resin material having a Shore hardness of 40 to 100.
In order to achieve the above object, a method of filling a paste material into the dispensing device of the present invention includes a cylinder filling the paste material, and a nozzle provided in the distal end portion of the cylinder, the cylinder And a plunger that can be moved back and forth in the cylinder, and an inner plug that is disposed on the distal end side of the plunger and prevents leakage of the paste material, and the inner plug is disposed on the front side. A front plug formed of a hard material and an elastically deformable rear plug disposed on the rear side, wherein the front plug has a maximum diameter slightly smaller than the inner diameter of the cylinder, and the rear plug Has a main seal part whose outer peripheral surface is always in close contact with the inner peripheral surface of the cylinder,
When filling the cylinder with the paste material, the cylinder is filled with the paste material from the front end side of the cylinder using only the front plug, and after filling the paste material into the cylinder, the front plug The rear plug was connected to the
The above-mentioned dispenser can be used for a two-paste mixed system, and can be used for a cylinder with two cylinders arranged side by side. A kneading instrument capable of kneading two kinds of pastes and discharging them as a mixed paste can be attached to a nozzle portion provided at the tip of the nozzle.

Pouring device of inner plug of the present invention, and a plug after being disposed on the rear side of the front stopper and the front stopper disposed on the front side, the rear plug is formed of an elastically deformable material The front plug is made of a hard material harder than the rear plug, the front plug is formed with a maximum diameter slightly smaller than the inner diameter of the cylinder, and the outer surface of the rear plug is always inside the cylinder. have a main seal portion which is in close contact with the peripheral surface, when the paste material in the cylinder is filled is arranged before stopper only in the cylinder, during pouring of the paste material, the rear plug before the plug since to be disposed on the rear side of the front plug without close contact with the inner peripheral surface of the cylinder body 6, the sliding resistance is hardly. Similarly, the front plug made of a hard material rather than the rear plug is only slightly smaller in diameter than the inner diameter of the cylinder main body, so that the paste can be poured out in a stable posture in the cylinder main body 6. Therefore, the main seal portion and the auxiliary seal portion that are easily deformed due to the elastic body are prevented from being displaced. In addition, since only the rear plug formed of an elastic member is in close contact with the inner peripheral surface of the cylinder body, there is a problem with the sealing performance without impairing the discharge feeling due to the presence of the hard front plug. Absent.
At the time of filling the paste material, only the front plug of the inner plug is used, so that the air can be easily removed.

It is sectional drawing which looked at the extractor of embodiment of this invention from the plane direction. It is a front stopper of the inside stopper of the pouring device of Drawing 1, A is a top view, B is a sectional view of the XX direction of Drawing 2C, and C is a bottom view. It is a back stopper of the inside stopper of the pouring device of Drawing 1, A is a top view, B is a sectional view of the YY line direction of A of Drawing 3, and C is a bottom view. It is sectional drawing which shows the modification of the back stopper of the inner stopper of FIG. 1 shows a state in which the cylinder in FIG. 1 is filled with paste, A is a cross-sectional view in a state where the cylinder is being filled with paste, B is a cross-sectional view in a state in which the cylinder is filled with paste, and C is a paste in the cylinder Is a cross-sectional view of a state in which the front plug is raised to the middle part of the cylinder. FIG. 2 is an enlarged plan view of a distal end portion of a plunger of the dispenser of FIG. 1, wherein A is a paste before discharging, B is discharging, and C is an enlarged plan view after discharging (a paste as a content is omitted). ). It is the modification of the cylinder of FIG. 1, Comprising: It is sectional drawing seen from the plane direction of the extractor provided with the double cylinder. It is an expanded sectional view of the kneading tool in the nozzle of the front-end | tip part of the cylinder of FIG.

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 the plunger 3 is inserted from the opening 10. Here, the inner diameter of the inner peripheral surface 11 of the cylinder body 6 is generally 3 to 20 mm.

The nozzle 7 is preferably reduced in diameter so that the paste can be dispensed 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 generally about 0.1 to 3.0 mm and the shape is generally circular, but may be oval, polygonal or trapezoidal. 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 on the inner peripheral surface side so as to correspond to the front side shape of the inner plug 4 described later.
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.

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 main body 13 may be the same circle as the drawing, or may be an oval shape or a cross shape (see FIG. 7). 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. At this time, there may be a resistance when the plunger main body 13 or the guide portion moves back and forth. In this case, the distance between the plunger 13 or 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 cylinder 2 and the plunger 3 are formed of a material that does not deform, and synthetic resins such as polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyethyl ether ketone, nylon, and fluorocarbon resin, glass, metal, and the like can be used.

The inner plug 4 includes a front plug 21 and a rear plug 22.
With reference to FIG. 2, the front plug 21 is provided with a conical portion 23 on the front end side and a cylindrical portion 24 on the rear end side, and the front end of the conical portion 23 corresponds to the tapered portion 9 on the front side of the cylinder body 6. The shape is formed so that the material of the filling chamber 15 can be sufficiently extruded so as not to waste expensive dental material. The front plug 21 has a circular insertion hole 25 formed therein in the axial direction. The insertion hole 25 is formed with an annular groove 26 projecting radially outward from the insertion hole 25. Two axial grooves 27 extending in the axial direction so as to face the central axis are formed on the peripheral surface. An annular rib 29 that protrudes in an arc shape radially outward from the outer peripheral surface 28 of the front plug 21 is formed at the outer peripheral rear portion of the front plug 21. The rear plug 22 includes the annular rib 29 and has an outer diameter slightly smaller than the inner peripheral diameter of the cylinder body 6 by about 0.01 to 2 mm, preferably about 0.1 to 0.5 mm. Further, the annular rib 29 may be continuous or intermittently formed.
The front plug 21 is formed of a material harder than the rear plug 22, but is preferably formed of a material that does not deform even when subjected to a pressing force or an internal pressure during the operation by the dispenser 1. It is made of hard synthetic resin.

Referring to FIG. 3, in this embodiment, the rear plug 22 is formed of an elastic material, and has a cylindrical main body 31 and a rear end side of the main body 31 that is radially outward from the rear end. The main seal part 32 which protrudes and the auxiliary seal part 33 arrange | positioned at intervals at the back side of the main seal part 32 are provided. In this embodiment, a V-shaped groove is formed between the main seal portion 32 and the auxiliary seal portion 33. However, in addition to the V-shaped groove, a rectangular groove or a trapezoidal groove may be used. You may form roundness. FIG. 4 shows a state in which the trapezoidal groove 36 is formed.
As shown in the present embodiment, the main seal portion 32 and the auxiliary seal portion 33 are preferably shaped like a pleat with tips (outer peripheral sides) that are pointed in a triangular shape. Both seal portions may have a general semicircular shape, but the pleated shape reduces the contact area and resistance with the cylinder body 6 and reduces the push-out feeling. Further, the back suction mechanism described later functions effectively. In the present embodiment, the front side forms a surface extending at right angles to the axial direction of the cylinder body 6, and the rear side forms a tapered surface whose diameter decreases toward the rear. On the other hand, the front surface side of the auxiliary seal portion 33 forms a tapered surface whose diameter increases toward the rear, and the rear surface side forms a surface extending perpendicular to the axial direction of the cylinder body 6, and the rear surface of the body portion 31. It is continuous.
By making the front surface of the main seal part and the rear surface of the auxiliary seal part at right angles to the axial direction of the cylinder body 6, it becomes easier to spread in the perpendicular direction at the time of pressurization for discharging the paste than in the case of taper shape. , Sealability is most improved.

The main seal portion 32 and the auxiliary seal portion 33 are disposed adjacent to each other, the outer diameter of the main seal portion 32 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 33 is the inner periphery. It is formed smaller than the diameter of the surface 11. The position where the auxiliary seal portion 33 is formed is the same as the front end portion of the plunger 3 or the front side of the front end portion (substantially 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 31 protrudes behind the auxiliary seal portion 33.
Further, in this embodiment, the pressing portion 17 of the plunger 3 is formed to be smaller than the outer diameter of the inner plug 4 and the inner diameter of the cylinder body 6 so that the inner peripheral surface 11 of the cylinder body 6 can slide. The inner diameter may be substantially the same. That is, you may abbreviate | omit the press part 17 shown in FIG.

An axial hole 34 is formed through the central axis of the main body 31. Further, an annular convex portion 35 protruding outward in the radial direction is formed on the outer peripheral surface of the main body portion 31.
The inner plug 4 is integrated by fitting the substantially cylindrical main body portion of the main body portion 31 of the rear plug 22 into the insertion hole 25 of the front plug 21. These are strongly combined without separation during operations such as when the paste is dispensed. Since the depth to the bottom of the fitting hole 25 (4.5 mm in this embodiment) is larger than the length from the tip of the main body 31 to the main seal portion 32 (4 mm), the front plug 21 and the rear plug 22 In an integrated state, a constant gap space (0.5 mm in simple calculation) remains at the bottom of the insertion hole 25. By providing this constant gap space, even when bubbles or excessive paste leaks from the side of the front plug 21 to the rear during filling, it can be retained in the insertion hole 25 when the rear plug 22 is inserted.
As described above, in a state where the front plug 21 and the rear plug 22 are fitted, the annular convex portion 35 is fitted and closely arranged in the annular concave portion 26. The axial groove 27 is substantially shielded by the annular convex portion 35 and has a structure that does not communicate with the fitting hole 25. Further, the front end surface of the main seal portion 32 and the rear end surface of the front plug 21 are disposed in close contact with each other.

In the paste dispenser 1 having such a basic structure, the filling chamber 15 formed in the front hollow portion of the cylinder 2 is filled with paste.
FIG. 5 shows a procedure for filling the cylinder 2 with paste.
When the paste is injected into the cylinder 2 of the dispenser 1, only the front plug 21 of the inner plug 4 is inserted from the rear end opening 10 of the cylinder 2 with the conical portion 23 of the front plug 21 facing the front side. The front plug 21 is set on the nozzle 7 side. In addition, since the outer diameter of the front plug 21 is slightly smaller than the inner diameter of the cylinder body 6, the axis of the front plug 21 and the axis of the cylinder body 6 are maintained in substantially the same direction. Is maintained substantially parallel (concentric) with the cylinder body 6.

The stock container 40 is a container filled with paste, and a paste extrusion port 41 is formed on one side surface. The extrusion port 41 is provided with means for airtightly setting the nozzle 7 side of the cylinder 1. Further, the stock container 40 is provided with a pressurizing means (not shown) for pressurizing the paste and pouring the paste from the extrusion port 41. Here, the paste having viscosity used for dentistry includes dental cement, crown restoration material, composite resin for dental filling restoration, and the like.
When the cylinder 2 is fixed to the stock container 40, the paste in the stock container 40 is pressurized by a pressurizing means (not shown).
As shown in FIG. 5A, the paste is injected from the extrusion port 41 to the nozzle 7 of the cylinder 2 by pressurizing the paste in the stock container 40. The gaps between the inner peripheral surface 11 of the cylinder body 6 and the outer peripheral surface 28 and the annular rib 29 (FIG. 6) of the front plug 21 allow air and bubbles to escape appropriately. In addition, the bubbles initially contained in the stock container 40 pass through these gaps, and the paste is injected into the filling chamber 15 without any gaps.

As shown in FIG. 5B, the front plug 21 is moved backward by the pressing force of the paste by the injection of the paste into the filling chamber 15. Since the gap between the cylinder body 6 and the front plug 21 is narrow, the paste is difficult to come out of the gap due to its viscosity. Further, since the front plug 21 is not in close contact with the inner peripheral surface of the cylinder body 6, the inside of the cylinder body 6 is retreated (raised) as if floating on the paste. When the paste has a high viscosity, etc., when air remains in the gap between the inner peripheral surface 11 of the cylinder body 6 and the outer peripheral surface 28 of the front plug 21 and the annular rib 29, the paste is filled. In addition, air can be completely extracted by applying a load that pushes the front plug 21 forward from the rear end opening 10 of the cylinder 2 after filling. The annular rib 29 of the front plug 21 serves to prevent the front plug 21 from making a linear contact with the cylinder body 6 in one direction, and has an effect of stabilizing the posture of the front plug 21. From the viewpoint of stability, the length of 21 is 1 to 20 mm, preferably 5 to 10 mm.
In addition, since the front plug 21 forms a gap with respect to the inner peripheral surface 11 of the cylinder body 6, no excessive pressure is applied to the paste.

With reference to C of FIG. 5 and A to C of FIG. 6, when the cylinder body 6 is filled with a desired amount of paste, the stock container 40 and the cylinder 2 are separated from the rear end opening 10 of the cylinder body 6, Insert the rear plug 22. When the rear plug 22 is inserted, air exists between the rear plug 22 and the front plug 21, but from the axial hole 34 as the front end of the main body portion 31 of the rear plug 22 is inserted into the insertion hole 25. Air escapes. Further, there may be a case where bubbles or excess paste wraps around the rear end of the front plug 21, but these bubbles and paste have a pair of axial grooves 27 formed on the peripheral surface of the insertion hole 25. Since the axial groove 27 communicates with the insertion hole 25 until just before the annular convex part 35 is attached to the annular concave part 26, air bubbles and paste are accumulated in the insertion hole 25, and the rear end side of the cylinder 2 Prevent air bubbles and paste from getting around.
In the present embodiment, air and bubbles that have entered the filling chamber 15 at the time of filling the paste can be extracted as described above.

In the paste dispenser having such a basic structure, the filling chamber 15 formed in the hollow portion in front of the inner plug 4 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 dispenser 1, the filling chamber 15 on the tip side of the inner plug 4 is connected to the cylinder body 6 behind the main seal portion 32. Is sealed, and the paste filled in the filling chamber 15 is prevented from flowing out from the plunger 3 toward the rear end opening 10. 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.

One of the features of the present invention is that in the middle plug 4 of the paste dispenser 1, a hard front plug 21 and a rear plug 22 formed of an elastic member are integrally provided as a double structure. . Therefore, in the present invention, although the hard front plug 21 is used as the inner plug 4, the diameter of the front plug 21 is slightly smaller than the inner diameter of the cylinder body 6. There is almost no sliding resistance without being in close contact with the inner peripheral surface 11 of the cylinder body 6. Similarly, since the front plug 21 made of a hard material is only slightly smaller in diameter than the inner diameter of the cylinder body 6, the paste can be poured out in a stable posture within the cylinder body 6. Further, since only the rear plug 22 formed of an elastic member is in close contact with the inner peripheral surface 11, the discharge feeling is not impaired, and there is no problem with the sealing performance. Thus, the present invention has an advantageous effect of drawing out the advantages of the hard material front plug 21 and the elastic rear plug 22 and eliminating the disadvantages.
For this effect, only the main seal portion 32 of the rear plug 22 may be provided, and the auxiliary seal portion 33 is not essential.

Another feature of the present invention is that an auxiliary seal portion 33 is formed in the vicinity of the main seal portion 32 for the rear plug 22. In the dispenser 1 having the structure in which the main seal portion 32 and the auxiliary seal portion 33 are formed, when the plunger 3 is pushed toward the tip of the cylinder 2, the paste as the filling material is always sealed by the main seal portion 32, On the other hand, while the paste has viscosity, the diameter of the spout 8 of the nozzle 7 is small, and the internal pressure of the filling chamber 15 is large.
When the internal pressure of the paste increases, a force that pushes the rear plug 22 back to the rear end opening 10 side of the cylinder 2 works, and the rear plug 22 presses the filling material (paste) and the plunger 3 through the front plug 21. Compressed with the unit 17. The front plug 21 is not deformed by such a compressive force, but the rear plug 22 is elastically deformed so as to contract in the front-rear direction and expand in the radial direction.
In particular, when the auxiliary seal portion 33 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 31 can be effectively expanded radially outward. . At this time, since the annular convex portion 35 of the rear plug 22 is fitted in the annular concave portion 26 of the front plug 21, the connection between the front plug 21 and the rear plug 22 is also firm.

When the main seal portion 32 expands radially outward, the main seal portion 32 is further brought into close contact with the inner peripheral surface 11 of the cylinder 2 to increase the sealing force, while the internal pressure of the paste is further increased.
At this time, when the auxiliary seal portion 33 is pushed by the pressing portion 17, the main body portion 31 expands radially outward, and the outer diameter of the auxiliary seal portion 33 is slightly smaller than the inner diameter of the inner peripheral surface 11 of the cylinder 2. Since it is only small, the entire annular auxiliary seal portion 33 is in close contact with the inner peripheral surface 11. In the present embodiment, since the pressing portion 17 is slightly smaller in diameter than the main body portion 31, the distal end sides of the main seal portion 32 and the auxiliary seal portion 33 that are outside the pressing portion 17 are more easily bent backward.

  Since the gap between the front plug 21 and the inner peripheral surface 11 is narrow, the paste is difficult to enter between them, but when it enters, the rear plug 22 prevents further penetration of the paste. When the paste is poured out, the rear plug 22 has the front ends of the main seal portion 32 and the auxiliary seal portion 33 integrated when the distance between the main seal portion 32 and the auxiliary seal portion 33 is narrow. It may seal or it may seal in a separated state. At this time, in the state where the tips are integrated with each other, both cooperate to improve the sealing force. In the separated state, even if the paste leaks from the main seal portion 32, the main seal portion Since the internal pressure is not as large as between the filling chamber 15 and the auxiliary seal portion 33, the paste that has entered between them can be sufficiently sealed by the sealing force of the auxiliary seal portion 33, Prevent leakage. In particular, since both the main seal portion 32 and the auxiliary seal portion 33 are located on the front side of the distal end position of the plunger 3, the main seal portion 32 and the auxiliary seal portion 33 are effectively in close contact with the inner peripheral surface 11. In particular, since the front plug 21 is formed of a hard material, displacement of the main seal portion 32 and the auxiliary seal portion 33 is prevented.

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 rear plug 22 of the inner plug 4, and the plunger 3 is returned backward (C in FIG. 6).
That is, the inner plug 4 (rear plug 22) moves forward when the plunger 3 is pushed in, the main seal portion 32 and the auxiliary seal portion 33 move forward, and the tip end portion is deformed so as to bend rearward, and the main body of the rear plug 22 The portion 31 advances slightly forward relative to the seal portions 32 and 33. When the pushing of the plunger 3 is released, the pushing force of the plunger 3 is released with respect to the rear plug 22 in the compressed state, 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 32 bent rearward is brought into close contact with the inner peripheral surface 11 of the cylinder 2 so that the position of the distal end portion being in contact remains unchanged and the bending is restored to the original shape. Then, the main body 31 that has been moved forward relative to the main seal portion 32 is pulled back to the rear side. On the other hand, the front plug 21 has almost no frictional resistance with the inner peripheral surface 11 and does not affect the restoration of the rear plug 22.
Since the front end portion of the auxiliary seal portion 33 is in close contact with the inner peripheral surface 11 when the load on the plunger 3 is released, the main body portion 31 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.
The relative movement of the main body 31 causes back suction in the filling chamber 15. Therefore, the internal pressure of the filling chamber 15 is reduced, and leakage from the paste spout 8 can be prevented.

The inventor increases the back suction when the position of the auxiliary seal portion 33 is brought close to the position of the main seal portion 32, and increases the distance L between the main seal portion 32 and the auxiliary seal portion 33 as shown in FIG. The knowledge that the back suction is reduced was obtained. Accordingly, when the position of the auxiliary seal portion 33 is adjusted to increase the back suction, the auxiliary seal portion 33 is brought close to the main seal portion 32 to prevent the air from being discharged from the discharge port 8 due to excessive back suction. In some cases, the main seal portion 32 and the auxiliary seal portion 33 may be separated from each other.
Further, since the shape of the main seal portion 32 directly affects the back suction, for example, the length in the radial direction may be changed to adjust a suitable amount of back suction, and the thickness (thickness with respect to the axial direction) may be adjusted. ) May be changed for adjustment.
Specifically, the radius of curvature (R) of the main seal portion 32 of the inner plug 4 and the tip (outer edge portion) of the auxiliary seal portion 33 is 0.1 to 0.4 mm from the viewpoint of both sealing performance and extrusion resistance. The range is particularly preferably 0.2 to 0.3 mm. The length L (FIG. 4) between the main seal portion 32 and the auxiliary seal portion 33 is preferably in the range of 1 to 4 mm, in particular, in which both the back suction function and the sealability are good. Moreover, it is preferable that the difference between the inner peripheral diameter of the cylinder and the outer peripheral diameter of the auxiliary seal portion is 0.1 to 2 mm in which both the back suction function and the sealing performance are favorable.

  The material of the paste dispenser of the present invention described above is not particularly limited, and may be metal or glass, but is usually a resin material such as polypropylene, polyethylene, polyethylene terephthalate, polybutylene. Fluorocarbon resins such as terephthalate, polyethyl ether ketone, nylon, and Teflon (registered trademark) are used. 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. As for the material of the inner plug 4, the front plug 21 is preferably the same material as the paste dispenser, and the rear plug 22 is preferably an elastic material made of a synthetic resin such as silicone resin or fluorine-based elastomer. These elastic materials generally have a Shore hardness of 100 or less, more preferably 40-100, and the back suction mechanism functions most effectively when the hardness is 50-80.

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.

  The tooth restorative material paste generally comprises a filler, a polymerizable monomer, and a photopolymerization initiator and / or a chemical polymerization 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 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 with a single cylinder, but as shown in FIG. 7, the two paste mixing system has two horizontal cylinders (multiple). It can also be used for lined items. Each of the filling chambers 15 in the cylinder 2 of the double cylinder dispenser 1 shown in FIG. 7 can be the same as the inner plug 4 shown in FIGS. 1 to 6, and the pair of plungers 3 have a cross section. Although it is a cross shape, guide portions 50a to 50c having a circular cross section are formed at three positions on the distal end side of the plunger 3, the action and effect of the inner plug 4 are the same. Further, the dispenser of the present application can be used for a gun-type dispenser (including two stations). In other words, when the dispenser 1 is used, it can be set in an extruder called an applicator such as a gun. By pulling the trigger of the applicator, the piston of the dispenser 1 is moved by the extrusion mechanism of the applicator. It is pushed and the filling material is discharged.
Further, in the case of a two-paste mixing system, a kneading instrument that can be discharged as a mixed paste obtained by kneading two pastes at the tips of the two discharge ports 8 can be attached.

  FIG. 8 shows a kneading instrument 52 provided in the nozzle portion 51 at the tip of the dispenser 1. In the kneading instrument 52, a plurality of screw-shaped wings 54 are spirally provided in the front-rear direction inside a nozzle 53. Such a mixing device 52 is capable of being mixed by repeatedly dividing and joining the flow path of the paste when the paste flows inside. Usually, when the mixing tool 52 is attached to the tip, the resistance increases, so that the pressure at the time of discharging the paste increases. When the pressure is high, the residual pressure after pressing tends to remain, and paste dripping tends to occur. Even when such a kneading instrument 52 is attached to the tip, even if the inner plug 4 of the present invention is an inner plug type, it functions as a back suction and an air vent while maintaining a stable posture. Sagging can be suppressed.

DESCRIPTION OF SYMBOLS 1 Dispenser 2 Cylinder 3 Plunger 4 Middle plug 6 Cylinder main body 7 Nozzle 8 Outlet 10 Opening 11 Inner peripheral surface 13 Plunger main body 15 Filling chamber 17 Pressing part 21 Front plug 22 Rear plug 25 Insertion hole 26 Annular recess 27 Axial groove 28 outer peripheral surface 29 annular rib 31 body part 32 main seal part 33 auxiliary seal part 34 axial hole 35 annular recess

Claims (5)

A cylinder provided with a filling chamber for filling the 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,
In the dispenser provided with an inner stopper disposed on the distal end side of the plunger and preventing leakage of the paste material,
The inner plug includes a plug after being disposed on the rear side of the front stopper and the front stopper disposed on the front side, the rear plug is formed of an elastically deformable material, said front plug the Made of hard material harder than the back plug,
The front plug is formed with a maximum diameter slightly smaller than the inner diameter of the cylinder,
The rear plug has a main seal portion whose outer peripheral surface is always in close contact with the inner peripheral surface of the cylinder, and when the paste material is filled in the cylinder, only the front plug is disposed in the cylinder, The pouring device is characterized in that, when the paste material is poured out, a rear plug is disposed on the rear side of the front plug.   The front plug is formed with an insertion hole from the center of the rear end surface toward the front, and the rear plug is formed with a main body portion that fits into the insertion hole. 2. The dispenser according to claim 1, wherein an axial hole for extracting air or bubbles is formed, and the axial hole communicates with the insertion hole. The rear plug includes a main body portion that is pressed when the plunger is advanced, a main seal portion that protrudes annularly from the main body portion outward in the radial direction of the cylinder, and that is always in close contact with the inner peripheral surface of the cylinder, and the main seal An auxiliary seal portion provided on the rear side of the portion with an interval and having an outer diameter slightly smaller than the inner diameter of the cylinder and projecting annularly from the inner portion of the inner plug to the outer side in the radial direction of the cylinder With
When the plunger moves forward when the paste material is dispensed, the main seal portion bends backward, and when the plunger is released, the main seal portion returns to its original shape, and the auxiliary seal portion compresses and expands the main body portion. The auxiliary seal portion is in close contact with the inner circumferential surface of the cylinder due to the radial expansion of the auxiliary seal portion, and when the plunger is released, the close-contact state of the auxiliary seal portion is released by returning the shape of the main body portion. The pouring device according to claim 1 or 2 formed.   In the inner plug, the front plug is made of one resin material selected from polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polyethyl ether ketone, nylon, and fluorocarbon resin, and the rear plug has a Shore hardness of 40 to 100. The pouring device according to any one of claims 1 to 3, comprising the soft resin material. A cylinder filling the paste material, and a nozzle provided in the distal end portion of the cylinder, and the inner allow back and forth movement of the disposed in the cylinder plunger of the cylinder is disposed on the distal end side of the plunger the An inner plug that prevents leakage of the paste material, and the inner plug includes a front plug formed of a non-deformable hard material disposed on the front side and an elastically deformable rear plug disposed on the rear side. The front plug is formed with a maximum diameter slightly smaller than the inner diameter of the cylinder, and the rear plug has a main seal portion whose outer peripheral surface is always in close contact with the inner peripheral surface of the cylinder. Use
When filling the cylinder with the paste material, the cylinder is filled with the paste material from the front end side of the cylinder using only the front plug, and after filling the paste material into the cylinder, the front plug A method of filling the pouring material into the dispenser, characterized in that a rear plug is connected to the plug.

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