Compule and syringe tip having discharge nozzle diameter widened at tip

Abstract

To provide a compule and syringe tip that can discharge viscous material in an intended shape by reducing deformation of the viscous material during discharge, can prevent viscous material from adhering to unintended portion by reducing an amount of viscous material that adheres to a nozzle tip, and can reduce dripping of viscous material to improve the anti-dripping property of the viscous material.SOLUTION: The discharge structure of a compule or a syringe tip has a flow passage 33a formed around a virtual center line and capable of moving viscous material, and a tapered flow passage 33c formed between the flow passage and a discharge port 33b and gradually increasing in cross section toward the discharge port.SELECTED DRAWING: Figure 13

Description

[Technical field]

[0001] The present invention relates to a compule and a syringe tip that are provided with a discharge structure that discharges a viscous material from a discharge port. [Background technology]

[0002] In the field of dentistry, pastes such as dental filling materials and materials for making dental crowns may be filled into an injector such as a compule that contains the paste inside as described in Patent Document 1, or a syringe as described in Patent Document 2, in order to optimize the amount of paste dispensed. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent No. 4,391,590 [Patent Document 2] U.S. Patent No. 5,445,523 Summary of the Invention [Problem to be solved by the invention]

[0004] In the conventional compule described in Patent Document 1 and the conventional syringe tip described in Patent Document 2, due to the characteristics of the paste (viscous material), a part of the paste discharged from the discharge port may adhere to the outer wall of the tip of the injector, such as the annular tip surface surrounding the discharge port or the outer wall along the flow path of the injector via this tip surface. If the amount of viscous material adhering to the outer wall of the tip of the injector increases, the viscous material falls from the outer wall of the tip of the injector, and the viscous material adheres to a portion where the viscous material is not intended to be applied. Therefore, with the conventional injector, it is difficult to apply the viscous material to a desired position. In addition, if the viscous material adhering to the outer wall of the tip of the injector falls to a desired position, more viscous material than the desired amount is applied, and this causes a problem that it is difficult to apply the desired amount of viscous material. Furthermore, if the viscous material adhering to the outer wall of the tip of the compule does not fall, the adhering viscous material is discarded, resulting in a problem of low efficiency in using the viscous material.

[0005] The object of the present invention is to provide a compule and syringe tip that can reduce deformation of viscous material during ejection, thereby ejecting the viscous material in the intended shape, reduce the amount of viscous material adhering to the nozzle tip, thereby preventing the viscous material from adhering to unintended areas, and reduce dripping of the viscous material, thereby allowing the viscous material to be easily cut off.

[0006] Another object of the present invention is to provide a compule and syringe tip that can apply a desired amount of viscous material to a desired location by reducing the amount of viscous material adhering to the outer wall, and preferably preventing adhesion of the viscous material to the outer wall, thereby increasing the efficiency of use of the viscous material. [Means for solving the problem]

[0007] In one embodiment, the present invention provides a syringe tip or a compule having an ejection structure for ejecting a viscous material from an ejection port, The discharge structure is a flow path formed around a virtual center line and capable of moving a viscous material; A compule or syringe tip is provided having a tapered flow path formed between the flow path and the discharge port, the cross-sectional area of ​​which gradually increases toward the discharge port. Effect of the Invention

[0008] According to the present invention, it is possible to provide a compule and syringe tip that can reduce deformation of the viscous material during ejection, thereby enabling the viscous material to be ejected in the intended shape, reduce the amount of viscous material adhering to the nozzle tip, thereby preventing the viscous material from adhering to unintended areas, and reduce dripping of the viscous material, thereby allowing the viscous material to be easily cut off. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a schematic diagram showing a state in which a compule having an ejection structure according to an embodiment is attached to an ejector holder; [Diagram 2] FIG. 1 is a perspective view of a computer according to an embodiment; [Diagram 3] FIG. 1 is a left side view of a computer according to an embodiment; [Figure 4] Cross-sectional view of plane AA in Fig. 2 [Diagram 5] FIG. 1 is an enlarged cross-sectional view of a discharge port of a Compule according to one embodiment. [Figure 6] FIG. 1 is a side view of a cap of a Compule according to one embodiment. [Figure 7] FIG. 1 is a cross-sectional view of a Compule according to one embodiment with a cap attached. [Figure 8] FIG. 1 is a perspective view of a computer according to another embodiment; [Figure 9] 1 is a left side view of a computer according to another embodiment. [Figure 10] Cross-sectional view of plane B in Figure 8 [Figure 11] FIG. 13 is an enlarged cross-sectional view of a discharge port according to another embodiment. [Figure 12] A perspective view of the piston [Figure 13] Schematic diagram of the outlet of a Compule according to one embodiment. [Figure 14] 1 is a schematic diagram showing the configuration of a syringe and a syringe tip according to one embodiment; [Figure 15] Syringe front view [Figure 16] Top view of syringe [Figure 17] Sectional view of line II in Figure 15 [Figure 18] FIG. 1 is a front view of a push bar according to an embodiment; [Figure 19] 1 is a plan view of a push rod according to an embodiment; [Figure 20] Sectional view of line III-III in Figure 18 [Figure 21] Syringe tip front view [Figure 22] Top view of the syringe tip [Figure 23] Sectional view of line II-II in Figure 21 [Figure 24] Enlarged cross-sectional view of the outlet of the syringe tip [Diagram 25] Schematic diagram of the outlet of the syringe tip [Figure 26] FIG. 2 is a cross-sectional view of the syringe tip and the syringe with the syringe tip attached to the tip of the syringe. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In one embodiment of the compule and syringe tip of the present invention, in a cross section including the imaginary center line, the angle between the extension direction of the peripheral wall of the flow path at the end on the discharge outlet side and the extension direction of the peripheral wall of the tapered portion can be 5° to 85°.

[0011] In one embodiment, the compule and syringe tip of the present invention may have a tapered portion having a frusto-conical shape.

[0012] In one embodiment of the compule and syringe tip of the present invention, the flow path may have a cylindrical shape.

[0013] In one embodiment of the compule and syringe tip of the present invention, the tapered flow path and the outer peripheral wall of the discharge container or the outer peripheral wall of the discharge device can be connected by an annular tip surface.

[0014] In one embodiment, the compule and syringe tip of the present invention may have an annular tip surface having a circular ring shape.

[0015] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. Fig. 1 is a schematic diagram showing a state in which a compule 1 having a discharge structure according to an embodiment of the present invention is mounted on an ejector holder 10, Fig. 2 is a perspective view of the compule 1, Fig. 3 is a left side view, Fig. 4 is a cross-sectional view of the AA plane in Fig. 2, and Fig. 5 is an enlarged cross-sectional view of the discharge port portion.

[0016] The ejector holder 10 has a barrel, and an inner hole extends from the rear end to the front end of the barrel. A plunger 18 having approximately the same diameter as the inner hole 12 is inserted into the inner hole, and a small-diameter extension is provided at the front end of the plunger 18. A first handle member 24 extending at an angle to the longitudinal direction of the barrel is fixed to the rear end of the barrel. A second handle member is provided to the first handle member 24 via a connecting member. A button 30 is provided at the rear end of the plunger 18, and by pressing this button 30, the plunger 18 is displaced toward the compule 1.

[0017] The Compule 1 is made of a resin material. Examples of the resin material that can be used include polyethylene, polyacetal, polypropylene, polyamide, vinyl chloride resin, nylon, phenol resin, polyurethane, saturated polyester resin, melamine resin, polyvinylidene chloride, unsaturated polyester resin, polybutadiene, polystyrene, EVA (ethylene-vinyl acetate copolymer) resin, styrene resin, polymethylpentene, methacrylic styrene, ABS (acrylonitrile, butadiene, styrene) resin, polycarbonate, etc. In this embodiment, the Compule 1 is made of polypropylene.

[0018] The Compule 1 of this embodiment has an engagement portion 31 that engages with the ejector holder 10, a cylindrical portion 32 having a hollow portion 32a centered on the imaginary center line IC, and a nozzle portion 33. The hollow portion 32a of the cylindrical portion 32 is filled with a viscous material, and the nozzle portion 33 ejects this viscous material. The viscous material can be, for example, a dental material such as a filling composite resin, a sealant material, a cement, a bonding material, a material for fixing loose teeth, an etching material, or a tooth surface polishing material.

[0019] The engagement part 31 of this embodiment has a hollow part 31a formed around the central axis. Therefore, the engagement part 31 of this embodiment has a cylindrical shape. A piston 34 is provided inside the engagement part 31. The outer diameter of the engagement part 31 can be, for example, 2.5 mm to 15 mm, and the dimension in the longitudinal direction of the compule 1 can be, for example, 10 mm to 50 mm. The inner diameter of the engagement part 31 of this embodiment can be, for example, 1 mm to 13 mm. One end of the hollow part 31a forms an insertion opening 31b into which the plunger 18 is inserted. The other end of the hollow part 31a is continuous with the hollow part 32a of the tubular part 32. An annular flange 35 is formed on the outer periphery of the engagement part 31.

[0020] The tubular portion 32 of this embodiment is a cylindrical member centered on the imaginary center line IC, and has a hollow portion 32a centered on the imaginary center line IC. Specifically, the tubular portion 32 of this embodiment has a cylindrical main body portion 32b with the hollow portion 32a formed therein. The outer diameter of the tubular portion 32 can be, for example, 2.5 mm to 15 mm, and the dimension in the longitudinal direction of the compule 1 can be, for example, 9 mm to 48 mm. One end of the hollow portion 32a of this embodiment is connected to the hollow portion 31a of the engagement portion 31, and can have an inner diameter of, for example, 1 mm to 13 mm. The main body portion 32b of this embodiment is formed so that the size of the cross section is constant. Moreover, the hollow portion 32a of this embodiment is formed so that the size of the cross section is constant. The other end of the hollow portion 32a of this embodiment is continuous with a flow path of the viscous material formed inside the nozzle portion 33.

[0021] In this specification, the virtual center line of the hollow portion means a line connecting the maximum Feret diameter in the cross section of the hollow portion perpendicular to the nozzle direction from the engagement portion, the maximum Feret diameter being taken as the diameter, the center of a virtual circle tangent to the contour of the cross section of the hollow portion being taken as the virtual center, and the virtual center being taken from the portion adjacent to the engagement portion to the portion adjacent to the nozzle.

[0022] In this embodiment, an imaginary center line IC located at the center of the hollow portion 32a is coaxial with the central axis of the hollow portion 31a.

[0023] The nozzle portion 33 discharges the viscous material contained in the hollow portion 32a. Specifically, the nozzle portion 33 of this embodiment has a flow path 33a for the viscous material formed therein, and one end of the flow path 33a is connected to the discharge port 33b. The nozzle portion 33 may have a dimension in the longitudinal direction of the cylindrical portion 32 of, for example, 1 mm to 40 mm. The nozzle portion 33 may have a dimension in the direction in which the flow path 33a extends of, for example, 5 mm or more, and may have a dimension in the direction in which the flow path 33a extends of, for example, 8 mm or more. By setting the dimension of the nozzle portion in the direction in which the flow path 33a extends to such a length, it is possible to easily fill the viscous material into, for example, the molar tooth located at the back of the oral cavity.

[0024] The nozzle portion 33 of this embodiment is formed so that the size of the cross section becomes smaller toward the discharge port 33b. The nozzle portion 33 may be formed so that the size of the cross section is constant toward the discharge port 33b, or may be formed so that the size of the cross section becomes larger toward the discharge port 33b. The flow path 33a of this embodiment is formed in a cylindrical shape so that the size of the cross section is constant toward the discharge port 33b. The flow path 33a may be formed so that the size of the cross section becomes smaller toward the discharge port 33b, or may have a truncated cone shape. Furthermore, the flow path 33a may be formed so that the size of the cross section becomes larger toward the discharge port 33b.

[0025] The nozzle portion 33 in this embodiment extends in a direction inclined with respect to the imaginary center line IC of the hollow portion 32 a of the cylindrical portion 32 .

[0026] In this embodiment, the flow path 33a is formed around the imaginary center line ICL, and a tapered flow path 33c whose cross-sectional area gradually increases toward the discharge port 33b is formed between the flow path 33a and the discharge port 33b. In this embodiment, the flow path 33a and the tapered flow path 33c are formed in the nozzle portion 33, and therefore, in this embodiment, the discharge structure of the present invention is configured in the nozzle portion 33.

[0027] The tapered flow passage 33c in this embodiment has a truncated cone shape, so that in a cross section including the imaginary center line of the flow passage 33a, the peripheral wall 33d of the tapered flow passage 33c has a linear shape.

[0028] As shown in Fig. 5, the flow path 33a of this embodiment is formed around an imaginary center line ICL. In this specification, the imaginary center line of the flow path can be defined as a line connecting the centers of gravity of the flow path in a cross section perpendicular to the moving direction of the viscous material. The nozzle portion 33 of this embodiment has a tapered flow path 33c formed between the flow path 33a and the discharge port 33b, and the cross-sectional area of ​​which gradually increases toward the discharge port 33b.

[0029] In the nozzle section 33 of this embodiment, the cross-sectional area gradually increases toward the outlet 33b in the tapered flow path portion continuing to the outlet 33b. Therefore, the internal pressure of the viscous material moving from the flow path 33a toward the outlet 33b can be reduced in the tapered section 33c, reducing the inherent distortion. If the viscous material is discharged while still having distortion, the internal pressure is released during discharge, causing deformation of the viscous material. By reducing the distortion, the deformation of the viscous material during discharge can be reduced, making it possible to discharge the viscous material in the intended shape.

[0030] In addition, the nozzle portion 33 of this embodiment has a tapered portion 33c that is continuous with the discharge port 33b. The presence of the tapered portion 33c reduces the area of ​​the annular tip surface 33h, which inevitably reduces the amount of viscous material that adheres to the annular tip surface 33h, and prevents the inner surface of the cap from becoming dirty when the cap is fitted. In addition, the adhesion of the viscous material to undesired areas due to the paste adhering to the annular tip surface 33h dripping is also suppressed. Furthermore, the presence of the tapered portion 33c allows the viscous material discharged through the peripheral wall 33e, the peripheral wall 33d, and the annular tip surface 33h to pass smoothly without being caught by the edge of the discharge port. Therefore, when the discharge of the viscous material is stopped, when the plunger 30 returns to its original position and the paste is drawn back, the viscous material is drawn back into the nozzle without remaining on the annular tip surface 33h, and therefore the sagging of the viscous material can be reduced. In addition, the viscous material is smoothly drawn back into the nozzle, which improves the cutting of the viscous material.

[0031] Furthermore, in the nozzle portion 33 of this embodiment, the cross-sectional area gradually increases toward the discharge port 33b at the tapered portion 33c continuing from the discharge port 33b, increasing the internal volume of the nozzle portion. Even if the plunger 30 is pulled back, the paste volume inside the nozzle increases, and therefore, even if pull-back occurs, the air sucked in from the tip portion remains at the nozzle tip, thereby reducing the inclusion of air bubbles.

[0032] The tapered flow passage 33c in this embodiment has a truncated cone shape. Therefore, in a cross section including the imaginary center line of the flow passage 33a, the peripheral wall 33d of the tapered flow passage 33c has a straight line shape. By making the peripheral wall 33d of the tapered flow passage 33c have a straight line shape in the cross section including the imaginary center line of the flow passage 33a, the cutting of the viscous material can be improved.

[0033] In the nozzle portion 33 of this embodiment, in a cross section of the flow path 33a including the imaginary center line ICL of the flow path 33a, the angle between the extending direction of the peripheral wall 33e of the flow path 33a at the end portion on the discharge port 33b side and the extending direction of the peripheral wall 33d of the tapered flow path 33c is preferably 5° to 85°, and more preferably 10° to 60°. By setting the angle to 5° to 85°, it is possible to prevent adhesion of the viscous material to the outer wall portion 33f of the nozzle portion 33. In this embodiment, the angle between the extending direction of the peripheral wall 33e of the flow path 33a at the end portion on the discharge port 33b side and the extending direction of the peripheral wall 33d of the tapered flow path 33c is 45°.

[0034] In the nozzle portion 33 of this embodiment, the tapered flow path 33c and the outer circumferential wall portion 33g of the nozzle portion 33 are connected by an annular tip surface 33h. In particular, in this embodiment, the annular tip surface 33h has a flat circular ring shape, which can improve the cutting of the viscous material.

[0035] Fig. 6 is a side view of the cap 36 of the compule according to one embodiment, and Fig. 7 is a cross-sectional view of the compule, cap, and piston according to one embodiment with the cap 36 attached. The compule 1 of this embodiment is configured such that, by attaching the cap 26 from the nozzle side during storage or when not in use, the light-shielding properties of the nozzle are improved to improve storage stability and prevent unintended dripping of the viscous material.

[0036] In the above embodiment of the Compule, the nozzle portion, the cylindrical portion, and the engagement portion are integrally molded from a resin material. This eliminates the need to press the nozzle in during manufacturing, making manufacturing easier. In addition, since the nozzle portion, the cylindrical portion, and the engagement portion are made only from a resin material, separation of metals is not required when disposing of the product, making disposal easier.

[0037] In the above embodiment of the compule, the nozzle portion, the cylindrical portion and the engagement portion are molded as a single unit, but the nozzle portion, the cylindrical portion and the engagement portion can be molded individually as separate members, as in the compule of other embodiments shown in Figures 8 to 11.

[0038] As shown in FIG. 12, the piston 34 of this embodiment has a substantially cylindrical shape.

[0039] The viscous material in the above embodiment may be a dental material, a pharmaceutical product, a medical material, a cosmetic product, a food product, or the like.

[0040] Although in the above embodiment the compule has a symmetrical shape, the compule may have an asymmetrical shape.

[0041] Although the Compule in the above embodiment is configured such that the extension direction of the nozzle portion is bent from the extension direction of the cylindrical portion, the nozzle portion and the cylindrical portion can be configured to be linear.

[0042] In the above embodiment of the Compule, the flow passage of the nozzle portion is formed linearly, but the flow passage of the nozzle portion can be formed in a curved shape.

[0043] In the Compule of the above embodiment, the cross-sectional size of the nozzle portion is formed to be constant toward the discharge port, but the cross-sectional size of the nozzle portion can be formed to become smaller toward the discharge port.

[0044] In the above embodiment of the compule, the flow path is formed so that the cross-sectional size is constant toward the discharge port, but the cross-sectional size of the flow path can be formed so that it becomes smaller toward the discharge port.

[0045] 14 is a schematic diagram showing the configuration of a nozzle-replaceable injector 101 having a discharge structure according to one embodiment of the present invention. In this embodiment, the injector 101 includes a syringe 102 and a syringe tip 103 that is detachably screwed onto a tip portion 121 of the syringe 102. The syringe tip 103 of this embodiment is attached and fixed to the tip portion of the syringe 102 by rotating the tip of the syringe 102 in a predetermined direction.

[0046] FIG. 15 is a front view of the syringe 102, FIG. 16 is a plan view of the syringe 102, and FIG. 17 is a cross-sectional view of the syringe 102 taken along line II in FIG. 15. The syringe 102 is also called a barrel. The syringe 102 is a cylindrical member centered on a central axis C1, and is made of, for example, a resin material or a glass material. Examples of the resin material that can be used include polyethylene, polyacetal, polypropylene, polyamide, vinyl chloride resin, nylon, phenolic resin, polyurethane, saturated polyester resin, melamine resin, polyvinylidene chloride, unsaturated polyester resin, polybutadiene, polystyrene, EVA (ethylene-vinyl acetate copolymer) resin, styrene resin, polymethylpentene, methacrylic styrene, ABS (acrylonitrile, butadiene, styrene) resin, and polycarbonate. In this embodiment, the syringe 102 is made of polypropylene.

[0047] The syringe 102 of this embodiment includes a push rod 104. The push rod 104 is sometimes referred to as a plunger. The syringe 102 of this embodiment includes a tip portion 121 having a discharge port 121a at one end, a rear end portion 122 having an insertion port 122a at one end into which the push rod 104 described below is inserted, and a main body portion 123 located between the tip portion 121 and the rear end portion 122. The outer diameter of the syringe 102 can be, for example, 3 mm to 15 mm.

[0048] The tip portion 121 of this embodiment is formed in a tapered tubular shape with a cross-sectional size decreasing toward the discharge port 121a. The dimension of the tip portion 121 in the longitudinal direction of the syringe can be, for example, 1 mm to 20 mm. The main body portion 123 of this embodiment is formed in a cylindrical shape so that the cross-sectional size is constant. The dimension of the main body portion 123 in the longitudinal direction of the syringe can be, for example, 30 mm to 150 mm. The rear end portion 122 of this embodiment is formed with a finger grip attachment portion 122b for attaching the finger grip 105. The dimension of the rear end portion 122 in the longitudinal direction of the syringe can be, for example, 1 mm to 20 mm.

[0049] The finger grip attachment portion 122b of this embodiment is composed of a pair of flange portions 122c and 122d formed around the entire circumference of the circumferential surface of the syringe 102, and eight recesses 122e formed between the pair of flange portions 122c and 122d. The pair of flange portions 122c and 122d restrict the movement of the finger grip 105 along the longitudinal direction of the syringe 102. In this embodiment, the flange portion 122d is formed larger than the flange portion 122c. In this embodiment, the flange portion 122d is formed at the rear end of the rear end portion 122. Eight protrusions (not shown) provided in a hollow portion (not shown) of the finger grip 105 are fitted into the eight recesses 122e. This fitting restricts the finger grip 105 from rotating in the circumferential direction of the syringe 102.

[0050] Inside the syringe 102, a hollow portion 124 for storing a viscous material is formed throughout the entire longitudinal direction centered on the central axis C1. At the tip 121, the hollow portion 124 is formed in a tapered shape in which the size of the cross section decreases toward the discharge port 121a. Specifically, at the tip 121, the hollow portion 124 is composed of a first tapered portion 124a, a first cylindrical portion 124b, a second tapered portion 124c, and a second cylindrical portion 124d. One end of the first tapered portion 124a is continuous with the main body 123, and the size of the cross section is configured to decrease toward the discharge port 121a from the size of the cross section at the main body 123. The first cylindrical portion 124b is continuous at one end with the first tapered portion 124a, and is configured to have an inner diameter of, for example, 0.1 mm to 13 mm so that the size of the cross section is constant. The second tapered portion 124c is continuous at one end with the cylindrical portion 124b, and is configured to have a size of the cross section that becomes smaller from the size of the cross section at the cylindrical portion 124b toward the discharge port 121a. The second cylindrical portion 124d is continuous at one end with the second tapered portion 124c, and is connected at the other end with the discharge port 121a, and is configured to have an inner diameter of, for example, 0.1 mm to 10 mm so that the size of the cross section is constant.

[0051] In the main body 123, the hollow section 124 is formed in a cylindrical shape with a constant cross-sectional size, for example, an inner diameter of 0.1 mm to 13 mm. In the rear end 122, the hollow section 121 is formed in a cylindrical shape with a constant cross-sectional size, for example, an inner diameter of 0.1 mm to 15 mm. Particularly in this embodiment, in the rear end 122, the hollow section 121 is formed in a portion continuous with the insertion opening 122a with a third tapered section 124e in which the cross-sectional size slightly increases toward the insertion opening 122a in order to facilitate the insertion of the push rod 104.

[0052] In the syringe 102 of this embodiment, a syringe tip mounting portion 125 is formed on the outer circumferential side of the tip portion 121. In this embodiment, the syringe tip mounting portion 125 is provided in an annular shape centered on the central axis C1. In this embodiment, the syringe tip mounting portion 125 is formed integrally with the syringe 102.

[0053] The syringe chip mounting part 125 of this embodiment has the same outer diameter as the main body part 123, and the outer peripheral surface 125a of the syringe chip mounting part 125 is configured to be substantially flush with the outer peripheral surface 123a of the main body part 123. The syringe chip mounting part 125 of this embodiment is provided so that a gap is formed between the inner peripheral surface 125b of the syringe chip mounting part 125 and the outer peripheral surface 121b of the tip part 121. The inner peripheral surface 125b of the syringe chip mounting part 125 of this embodiment is provided with a female thread. The syringe chip mounting part 125 of this embodiment is formed so that the inner peripheral surface 125b becomes slightly smaller in diameter as it reaches the tip side in the longitudinal direction. The tip part 121 is extended toward the tip side in the longitudinal direction from the syringe chip mounting part 125.

[0054] Tip portion 121 of syringe 102 of this embodiment has a shape capable of abutting against a cylindrical portion of syringe tip 103 in syringe tip 103 described later. Specifically, end face 121c on the longitudinal tip side of tip portion 121 of syringe 102 of this embodiment is formed to be capable of abutting against an end face on the longitudinal rear end side of the cylindrical portion of syringe tip 103.

[0055] 18 is a front view of the push bar 104 of this embodiment, FIG. 19 is a plan view of the push bar 104 of this embodiment, and FIG. 20 is a cross-sectional view of the push bar 104 taken along line III-III in FIG.

[0056] The push rod 104 is a member for pushing the viscous material contained in the syringe 102 toward the tip 121 (i.e., the discharge port 121a) of the syringe 102, and is made of, for example, a resin material. Examples of the resin material that can be used include polyethylene, polyacetal, polypropylene, polyamide, vinyl chloride resin, nylon, phenolic resin, polyurethane, saturated polyester resin, melamine resin, polyvinylidene chloride, unsaturated polyester resin, polybutadiene, polystyrene, EVA (ethylene-vinyl acetate copolymer) resin, styrene resin, polymethylpentene, methacrylic styrene, ABS (acrylonitrile, butadiene, styrene) resin, polycarbonate, and the like. In this embodiment, the push rod 104 is made of low-density polyethylene.

[0057] The push rod 104 of this embodiment has a hollow cylindrical main body 141, a seal portion 142 formed at one end of the main body, and a finger hook portion 143 formed at the other end of the main body.

[0058] Body portion 141 has an outer diameter smaller than the inner diameter of syringe 102. Therefore, when push rod 104 is housed in syringe 102, a gap is generated between body portion 141 and syringe 102.

[0059] The seal portion 142 is disk-shaped, and its outer circumferential end is in slidable and fluid-tight contact with the inner circumferential surface of the syringe 102. Although the seal portion 142 and the main body portion 141 are integrated as one component, the seal portion 142 and the main body portion 141 may be separate components.

[0060] Furthermore, since the outer peripheral end of seal portion 142 is in fluid-tight contact with the inner peripheral surface of syringe 102, seal portion 142 has an outer diameter larger than the inner diameter of syringe 102. The outer diameter of seal portion 142 is larger than the outer diameter of main body portion 141.

[0061] Figure 21 is a front view of a syringe chip of one embodiment, Figure 22 is a plan view of the syringe chip of one embodiment, Figure 23 is a cross-sectional view along line II-II of Figure 21, Figure 24 is an enlarged cross-sectional view of the outlet portion of the syringe chip of one embodiment, Figure 25 is a schematic diagram of the outlet portion of the syringe chip of one embodiment, and Figure 26 is a cross-sectional view of the syringe chip and syringe with the syringe chip attached to the tip of the syringe.

[0062] The syringe tip 103 of this embodiment is attached to the tip of the syringe 102 that contains a viscous material and discharges the viscous material. The syringe tip 103 has a syringe engaging portion 131 that engages with the syringe 102, a hollow portion 132a centered on the imaginary center line IC, and a cylindrical portion 132 that is held by the user when engaging the syringe tip 103 with the syringe 102, and a nozzle portion 133 that discharges the viscous material contained in the syringe 102.

[0063] The syringe engagement portion 131 of this embodiment is a cylindrical member centered on the central axis C2, and has a syringe insertion portion 131a into which the tip of the syringe 102 is inserted. The outer diameter of the syringe engagement portion 131 can be, for example, 0.1 mm to 13 mm, and the dimension in the longitudinal direction of the syringe tip 103 can be, for example, 7 mm to 50 mm. In this embodiment, the syringe insertion portion 131a is provided in an annular shape centered on the central axis C2, and can have an inner diameter of, for example, 0.1 mm to 12 mm. One end of the syringe insertion portion 131a constitutes an insertion port 131b into which the syringe 102 is inserted. The other end of the syringe insertion portion 131a is continuous with a hollow portion 132a of the cylindrical portion 132.

[0064] In particular, syringe insertion portion 131a of this embodiment is formed in a tapered shape in which the size of the cross section decreases toward cylindrical portion 132. In syringe insertion portion 131a of this embodiment, in order to facilitate the insertion of syringe 102, tapered portion 131c in which the size of the cross section increases slightly toward insertion port 131b is formed in a portion continuous with insertion port 131b.

[0065] In this embodiment, an engagement piece 131d that screws into the female screw of the syringe tip mounting part 125 is provided at the end of the outer periphery of the syringe engagement part 131 on the side of the insertion port 131b and protrudes radially outward. In this embodiment, a pair (two) of engagement pieces 131d are provided facing each other in the diameter direction, and each engagement piece 131d is configured as a flat protrusion in the circumferential direction. It is also possible to provide three or more engagement pieces 131d, and it is also possible to provide multiple engagement pieces 131d at different positions along the central axis C2. Each engagement piece 131d may be formed to be slightly inclined in a spiral shape.

[0066] The syringe engaging portion 131 can be formed of, for example, a resin material. Examples of the resin material that can be used include polyethylene, polyacetal, polypropylene, polyamide, vinyl chloride resin, nylon, phenol resin, polyurethane, saturated polyester resin, melamine resin, polyvinylidene chloride, unsaturated polyester resin, polybutadiene, polystyrene, EVA (ethylene-vinyl acetate copolymer) resin, styrene resin, polymethylpentene, methacrylic styrene, ABS (acrylonitrile, butadiene, styrene) resin, and polycarbonate. In this embodiment, the syringe engaging portion 131 is made of polypropylene. The material of the syringe engaging portion 131 may be the same as or different from the material of the syringe 102.

[0067] The tubular portion 132 of this embodiment is a cylindrical member centered on the imaginary center line IC, and has a hollow portion 132a centered on the imaginary center line IC. Specifically, the tubular portion 132 of this embodiment has a cylindrical main body portion 132b with the hollow portion 132a formed therein. The outer diameter of the tubular portion 132 can be, for example, 0.1 mm to 13 mm, and the dimension in the longitudinal direction of the syringe tip 103 can be, for example, 0.5 mm to 5 mm. One end of the hollow portion 132a of this embodiment is connected to the syringe insertion portion 131a of the syringe engagement portion 131, and can have an inner diameter of, for example, 0.1 mm to 12 mm. The other end of the hollow portion 132a of this embodiment is continuous with a flow path of the viscous material formed inside the nozzle portion 133. The main body portion 132b of this embodiment is formed so that the size of the cross section is constant. Moreover, the hollow portion 132a in this embodiment is formed so that the size of the cross section is constant.

[0068] The cylindrical portion 132 can be formed of, for example, a resin material. Examples of the resin material that can be used include polyethylene, polyacetal, polypropylene, polyamide, vinyl chloride resin, nylon, phenol resin, polyurethane, saturated polyester resin, melamine resin, polyvinylidene chloride, unsaturated polyester resin, polybutadiene, polystyrene, EVA (ethylene-vinyl acetate copolymer) resin, styrene resin, polymethylpentene, methacrylic styrene, ABS (acrylonitrile, butadiene, styrene) resin, and polycarbonate. In this embodiment, the syringe engaging portion 131 is made of polypropylene. The material of the cylindrical portion 132 may be the same as or different from the material of the syringe 102 and the syringe engaging portion 131.

[0069] In this embodiment, an imaginary center line IC located at the center of the hollow portion 132a is coaxial with the central axis C1 of the syringe 102 and the central axis C2 of the syringe insertion portion 131a.

[0070] Cylindrical portion 132 of the present embodiment has connecting portion 132c that connects main body portion 132b and syringe engaging portion 131. Connecting portion 132c of the present embodiment is configured to have a truncated cone shape.

[0071] In the connection portion 132c of this embodiment, a connection hollow portion 132d is formed inside, which connects the hollow portion 132a and the syringe insertion portion 131a of the syringe engagement portion 131. The connection hollow portion 132d of this embodiment is configured such that the radial dimension (hereinafter also simply referred to as the radial dimension) centered on the imaginary center line IC is larger than the radial dimension of the hollow portion 132a and smaller than the radial dimension of the syringe insertion portion 131a. The connection hollow portion 132d of this embodiment has an annular abutment surface 132e at the end on the hollow portion 132a side against which the end surface 121c on the longitudinal tip side of the tip portion 121 of the syringe 102 abuts.

[0072] In the present embodiment, the cylindrical portion 132 is provided with a pair of wing portions 134 on the outer wall of the main body portion 132b. The radial dimension of the wing portions 134 can be, for example, 8 mm to 12 mm, and the dimension in the longitudinal direction of the syringe tip 103 can be, for example, 0.5 mm to 5 mm. The pair of wing portions 134 in the present embodiment are provided facing each other in the radial direction centered on the imaginary center line IC. The pair of wing portions 134 in the present embodiment are formed from the end on the syringe engaging portion 131 side. In other words, the pair of wing portions 134 in the present embodiment are formed across the main body portion 132b and the connecting portion 132c. In particular, the pair of wing portions 134 in the present embodiment are formed so that the radial outer ends of the pair of wing portions 134 and the radial outer end of the syringe engaging portion 131 are flush with each other. Further, the pair of blades 134 in this embodiment are configured to have a reduced diameter portion 134 a on the nozzle portion 133 side, the radial dimension of which decreases toward the nozzle portion 133 .

[0073] In the above embodiment, the cylindrical portion 132 has a main body portion 132b in which a hollow portion 132a is formed, and a pair of blade portions 134 provided on the outer wall portion of the main body portion 132b.

[0074] Nozzle portion 133 discharges the viscous material contained in syringe 102. Specifically, nozzle portion 133 of the present embodiment has a flow path 133a for the viscous material formed therein, and one end of flow path 133a is connected to discharge port 133b. The dimension of nozzle portion 133 in the longitudinal direction of syringe tip 103 can be, for example, 1 mm to 40 mm. Furthermore, the dimension of nozzle portion 133 in the direction in which flow path 133a extends can be 5 mm or more, and can be 8 mm or more. By setting the dimension of nozzle portion in the direction in which flow path 133a extends to such a length, it is possible to easily fill the viscous material, for example, into the molar at the back of the oral cavity.

[0075] The nozzle portion 133 of this embodiment is formed so that the size of the cross section becomes smaller toward the discharge port 133b. The nozzle portion 133 may be formed so that the size of the cross section is constant toward the discharge port 133b, or may be formed so that the size of the cross section becomes larger toward the discharge port 133b. The flow path 133a of this embodiment is formed so that the size of the cross section becomes smaller toward the discharge port 133b. In particular, the flow path 133a of this embodiment has a truncated cone shape. The flow path 133a may be formed so that the size of the cross section is constant toward the discharge port 133b, or may be formed so that the size of the cross section becomes larger toward the discharge port 133b. The flow path 133a can be cylindrical.

[0076] The nozzle portion 133 is made of, for example, a resin material or a metal material. Examples of the resin material that can be used include polyethylene, polyacetal, polypropylene, polyamide, vinyl chloride resin, nylon, phenolic resin, polyurethane, saturated polyester resin, melamine resin, polyvinylidene chloride, unsaturated polyester resin, polybutadiene, polystyrene, EVA (ethylene-vinyl acetate copolymer) resin, styrene resin, polymethylpentene, methacrylstyrene, ABS (acrylonitrile, butadiene, styrene) resin, polycarbonate, and the like. In this embodiment, the nozzle portion 133 is made of polypropylene.

[0077] In the syringe tip of this embodiment, the nozzle portion, the cylindrical portion, and the syringe engaging portion are integrally formed.

[0078] The nozzle portion 133 of this embodiment extends in a direction inclined with respect to the imaginary center line IC of the hollow portion 132a of the cylindrical portion 132. Moreover, the nozzle portion 133 is provided such that the extension direction of the nozzle portion 133 is parallel to the pair of blade portions.

[0079] As clearly shown in FIG. 24, the flow path 133a of this embodiment is formed around the virtual center line ICL. In this specification, the virtual center line of the flow path can be defined as a line connecting the centers of gravity of the flow path in a cross section perpendicular to the moving direction of the viscous material. The nozzle portion 133 of this embodiment has a tapered flow path 133c formed between the flow path 133a and the discharge port 133b, and the cross-sectional area of ​​which gradually increases toward the discharge port 133b. In this embodiment, the flow path 133a and the tapered flow path 133c are formed in the nozzle portion 133, and therefore, in this embodiment, the discharge structure of the present invention is configured in the nozzle portion 133.

[0080] Since the nozzle portion 133 of this embodiment has the discharge structure of the present invention, the cross-sectional area of ​​the tapered flow path continuing to the discharge port 133b gradually increases toward the discharge port 133b. Therefore, the internal pressure of the viscous material moving from the flow path 133a toward the discharge port 133b is reduced in the tapered portion 133c, and the inherent distortion can be reduced. If the viscous material is discharged while it is distorted, the internal pressure is released during discharging, causing deformation of the viscous material. By reducing the distortion, the deformation of the viscous material during discharging can be reduced, and the viscous material can be discharged in the intended shape.

[0081] In addition, in the nozzle portion 133 of this embodiment, there is a tapered portion 133c that continues to the discharge port 133b. The presence of the tapered portion 133c reduces the area of ​​the annular tip surface 133h, which inevitably reduces the amount of viscous material that adheres to the annular tip surface 133h, and prevents the inner surface of the cap from becoming dirty when the cap is fitted. In addition, the adhesion of the viscous material to undesired areas due to the paste adhering to the annular tip surface 133h dripping is also suppressed. Furthermore, the presence of the tapered portion 133c allows the viscous material discharged through the peripheral wall 133e, the peripheral wall 133d, and the annular tip surface 133h to pass smoothly without being caught by the edge of the discharge port. Therefore, when the discharge of the viscous material is stopped, when the deformed push rod recovers to its original shape and the paste is pulled back, the viscous material does not remain on the annular tip surface 133h and is pulled back into the nozzle, so that the dripping of the viscous material can be reduced. Furthermore, the viscous material is smoothly drawn back into the nozzle, which allows the viscous material to be cut off smoothly.

[0082] Furthermore, in the nozzle portion 133 of this embodiment, the cross-sectional area gradually increases toward the discharge outlet 133b at the tapered portion 133c continuing from the discharge outlet 133b, increasing the internal volume of the nozzle portion. Even if the push rod 104 is pulled back, the paste volume inside the nozzle increases, and therefore, even if pull-back occurs, the air sucked in from the tip portion remains at the nozzle tip, thereby reducing the inclusion of air bubbles.

[0083] The tapered flow path 133c of this embodiment has a truncated cone shape. Therefore, in a cross section including the virtual center line of the flow path 133a, the peripheral wall 133d of the tapered flow path 133c has a straight line shape. By making the peripheral wall 133d of the tapered flow path 133c have a straight line shape in this way in a cross section including the virtual center line of the flow path 133a, it is possible to improve the cutting of the viscous material.

[0084] In the nozzle portion 133 of this embodiment, in a cross section of the flow path 133a including the imaginary center line ICL of the flow path 133a, the angle between the extending direction of the peripheral wall 133e of the flow path 133a at the end portion on the discharge port 133b side and the extending direction of the peripheral wall 133d of the tapered flow path 133c is preferably 5° to 85°, and more preferably 10° to 60°. By setting it to 5° to 85°, it is possible to prevent adhesion of the viscous material to the outer wall portion 133f of the nozzle portion 133. In this embodiment, the angle between the extending direction of the peripheral wall 133e of the flow path 133a at the end portion on the discharge port 133b side and the extending direction of the peripheral wall 133d of the tapered flow path 133c is 45°.

[0085] In the nozzle portion 133 of this embodiment, the tapered flow path 133c and the outer circumferential wall portion 133g of the nozzle portion 133 are connected by an annular tip surface 133h. In particular, in this embodiment, the annular tip surface 133h has a flat circular ring shape, which can improve the cutting of the viscous material.

[0086] In this embodiment, when viewed in the longitudinal direction of the syringe tip, the angle formed between the plane along which the pair of wing portions extend and the plane along which the nozzle portion extends can be 45° or less.

[0087] In the above embodiment, the tip of the syringe is configured to be able to abut against the syringe tip inside the syringe tip, which makes it possible to prevent air bubbles from being mixed in when the viscous material moves from the syringe to the syringe tip, and also makes it possible to reduce the amount of viscous material remaining in the syringe tip, thereby making it possible to prevent the viscous material from dripping from the syringe when replacing the syringe tip.

[0088] In the syringe tip of the above embodiment, the nozzle portion, the cylindrical portion, and the syringe engagement portion are integrally molded from a resin material. Therefore, the nozzle press-fitting operation is not required during manufacturing, making manufacturing easier. In addition, since the nozzle portion, the cylindrical portion, and the syringe engagement portion are made of only a resin material, separation of metals is not required when disposing of the syringe tip, making disposal easier.

[0089] In the above embodiment, a dental material is used as the viscous material, but the viscous material may be a medicine, a medical material, a cosmetic, a food, or the like.

[0090] In the above embodiment, the cylindrical portion has a main body portion having a hollow portion and a pair of wing portions provided on the outer wall portion of the main body portion, but the syringe tip does not have to have wing portions. Also, in the above embodiment, the syringe tip has two wing portions, but the number of wing portions is not limited to two, and may be one, or three or more.

[0091] Although in the above embodiment the syringe tip has a symmetrical shape, the syringe tip may have an asymmetrical shape.

[0092] Although the syringe tip of the above embodiment is configured such that the extension direction of the nozzle portion is bent from the extension direction of the cylindrical portion, the nozzle portion and the cylindrical portion can be configured to be linear.

[0093] In the syringe tip of the above embodiment, the flow channel of the nozzle portion is formed linearly, but the flow channel of the nozzle portion can be formed in a curved shape.

[0094] In the syringe tip of the above embodiment, the nozzle portion, the cylindrical portion, and the syringe engaging portion are integrally molded, but the nozzle portion, the cylindrical portion, and the syringe engaging portion can be molded individually as separate members.

[0095] In the syringe tip of the above embodiment, nozzle portion 133 is formed so that the size of the cross section decreases toward discharge port 133b, but the size of the cross section of nozzle portion 133 can be constant.

[0096] In the syringe tip of the above embodiment, flow channel 133a is formed so that the size of the cross section decreases toward discharge port 133b, but the size of the cross section of flow channel 133a can be constant.

[0097] In the above embodiment, the syringe tip and the syringe are screwed together using an internal thread. However, the syringe tip and the syringe can also be screwed together using a so-called external thread. [Industrial Applicability]

[0098] According to the present invention, a compule and a syringe tip can be provided that can apply a desired amount of viscous material to a desired location by reducing the amount of viscous material adhering to the outer wall portion, and preferably preventing adhesion of the viscous material to the outer wall portion, thereby increasing the efficiency of use of the viscous material. [Explanation of symbols]

[0099] IC virtual center line 1 Compule 10 Ejector holder 18 Plunger 20 Extension 22 Handle member 24 Operating lever 30 Buttons 31 Engagement part 31a Hollow part 31b Insertion port 32 Cylindrical section 32a Hollow part 32b Main body 33 Nozzle section 33a Flow path 33b Discharge port 33c Tapered flow path 33d surrounding wall 33g outer peripheral wall 33h Tip surface 34 Piston 35 Flange 101 Syringe 102 Syringe 121 Tip 121a Discharge port 121b Outer surface 121c end face 122 Rear end 122a Insertion port 122b Finger grip attachment part 122c Flange part 122d Flange part 122e Recess 123 Main body 123a Outer surface 124 Hollow part 124a first tapered portion 124b First cylindrical section 124c Second tapered section 124d Second cylindrical section 124e Third taper 125 Syringe tip attachment part 125a Inner surface 125b Outer surface 103 Syringe Tip 131 Syringe engagement part 131a Syringe insertion part 131b Insertion port 131c Tapered section 131d Engagement piece 132 Cylindrical part 132a Hollow part 132b Main body 132c Connection 132d Connection Hollow Section 132e Contact surface 133 Nozzle section 133a Channel 133b Discharge port 133c Tapered flow path 133d Peripheral wall 133e Surrounding wall 133f External wall 133g outer wall 133h Tip surface 134 Wing 134a Reducing diameter section 104 Push Stick 141 Main body 142 Seal part 143 Finger rest 105 Finger Grip C1 center axis C2 center axis IC virtual center line

Claims

1. A syringe tip or a syringe having a discharge structure for discharging a viscous material from a discharge port, The discharge structure is a flow path formed around an imaginary center line and through which a viscous material can move; a tapered flow path formed between the flow path and the discharge port, the cross-sectional area of ​​which gradually increases toward the discharge port; The compule or syringe tip includes a cylindrical portion having a hollow portion filled with a viscous material, and a nozzle portion for discharging the viscous material; The ejection structure is configured in the nozzle portion, A compule or syringe tip in which the nozzle portion is formed so that the size of the cross section becomes smaller toward the discharge port, or the size of the cross section is formed constant toward the discharge port.

2. A compule or syringe tip according to claim 1, wherein in a cross section of the flow path including the imaginary center line, the angle between the extension direction of the peripheral wall of the flow path at the end on the outlet side and the extension direction of the peripheral wall of the tapered flow path is 5° to 85°.

3. 2. The syringe tip of claim 1, wherein the tapered channel has a frusto-conical shape.

4. 2. The syringe tip of claim 1, wherein the channel has a truncated cone or cylindrical shape.

5. 2. The syringe tip according to claim 1, wherein the tapered flow path and the outer peripheral wall of the discharge container or the discharge implement are connected by an annular tip surface.

6. 6. The syringe tip according to claim 5, wherein the annular tip surface has a circular ring shape.

7. The compule according to any one of claims 1 to 6.

8. A compule as described in Claim 7, wherein the nozzle portion is formed so that the size of the cross section decreases toward the outlet.

9. The syringe tip according to any one of claims 1 to 6.

10. A syringe tip as described in Claim 9, wherein the nozzle portion is formed so that the size of the cross section becomes smaller toward the discharge port.

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