JP3836495B2 - Dental viscous material filled syringe - Google Patents

Description

  The present invention relates to a dental viscous material-filled syringe, and more particularly to a dental viscous material-filled syringe filled with a paste-like dental viscous material having a low viscosity to a high viscosity.

  2. Description of the Related Art Conventionally, a dental viscous material-filled syringe has a cap that is separate from the cylinder attached to the nozzle at the tip of the cylinder, removes the cap, and pushes the dental material filled inside the cylinder through the core with an extrusion rod. It is designed to be used by extruding it.

  Such a dental viscous material-filled syringe is used quite frequently (100 times or more) in daily dental treatment, and often opens and closes the cap. In this case, the cap may be accidentally dropped and lost. In addition, the cap may be mistaken for another cap. Loss of the cap leaves the nozzle open, which can contaminate the contents. In particular, dental photopolymerizable composite resins are expected to be altered by light irradiation even temporarily.

  The following is an example, but not limited to this. If the contents of the dental viscous material-filled syringe are of photopolymerization type, the contents will be deteriorated and the photosensitivity will be reduced by only being exposed to light. Degradation of characteristics can occur. In order for a dentist or technician to use a syringe filled with a viscous dental material alone, first hold the syringe in the left hand and the instrument 2 in the right hand, open the syringe cap with the right hand, and place the cap on the table. Then, the contents are scraped off with an instrument, the cap is removed from the table, the cap is capped, and then the contents of the instrument are used in the oral cavity and photocured. To use a syringe by two people, a dentist and a hygienist, the hygienist must first hold the syringe in the left hand and open the syringe cap with the right hand, and the dentist can use the syringe with the instrument. When the contents are scraped, the hygienist caps and the dentist uses the contents of the instrument in the mouth and light cures. In such a method, a lot of light hits the contents, photosensitivity occurs, and the contents deteriorate. In a dentist's treatment work or a technician's work, a syringe is used under a powerful light, so it is necessary to avoid any deterioration of the contents. For this reason, it is very important to create an environment in which contents can be taken out without shining light on the contents as much as possible.

  On the other hand, in order to press-fit the dental viscous material into the dental viscous material-filled syringe, there are a method of press-fitting from the tip nozzle of the cylinder and a method of press-fitting from the rear end of the cylinder. The method of press-fitting from the tip nozzle is preferable because the filling amount can be measured by the amount by which the push rod moves through the core, but usually the press-fitting from the tip nozzle is difficult if the dental viscous material has a high viscosity. is there. In the method of press-fitting from the rear end, since there is a space for housing the core at the rear part of the cylinder, the moving distance of the dental viscous material at the time of filling becomes longer by that amount. For this reason, depending on the nature of the dental viscous material, changes in properties and air entrainment often occurred.

  In the conventional press-fitting method, it cannot be said that there is no air entrainment. The inclusion of air bubbles by entrainment of air causes an important problem for dental viscous materials. For example, bubbles appear due to polishing and the tongue feels worse, and the inherent characteristics of the dental viscous material are reduced. A further problem is that the color tone changes due to the entrainment of air, and it is impossible to take advantage of the characteristics of the viscous dental material that should have the same color development, color tone and texture as natural teeth.

  An object of the present invention is to prevent the cap of the dental viscous material-filled syringe from being lost and to open and close the cap quickly and easily. It is another object of the present invention to make it possible to easily press-fit a dental viscous material without causing changes in its properties.

In order to solve the above-mentioned problems, in the present invention, a high-viscosity dental viscous material filled in a resin cylinder is extruded from a nozzle at the tip by rotating an extrusion rod screwed into the rear end of the cylinder. in the dental viscous material filled syringe to the tip of the cylinder, the cap for closure of the nozzle is formed integrally through the hinge, the space provided between the previous and the cap of the nozzle, said in the space The high-viscosity dental viscous material that has come out of the nozzle due to the residual pressure is accommodated.

  Further, the closed end of the cap is formed by an inclined surface, and a finger-hanging protrusion is provided at the end of the inclined surface.

Further, the cap covers the nozzle so that light is not directly applied to the contents exposed from the nozzle when the cap is half-closed so that the opening end of the cap does not fit into the fitting portion formed at the tip of the cylinder . .
Further, the inner wall of the cap is matted.

  As is clear from the above description, according to the present invention, the cap that covers the nozzle is formed integrally with the cylinder via the hinge, so that the cap does not fall when opening and closing the cap, and there is no risk of loss. In addition, since it can be opened and closed quickly and easily, photosensitivity can be prevented and the quality of the internal dental viscous material can be stabilized. Furthermore, it is possible to prevent the color tone from being mixed by mistakenly attaching caps having different color tones.

In addition, since a space is provided between the tip of the nozzle and the cap, the contents of the high-viscosity material that has come out of the nozzle due to the residual pressure do not contact the cap and do not open the cap.
  Since the closed end of the cap is formed with an inclined surface and the finger-hanging protrusion is provided at the end of the inclined surface, the cap can be opened with one touch by hooking the thumb on the finger-hanging protrusion.

In addition, since the cap covers the nozzle when half-closed, the contents exposed from the nozzle do not directly shine. In addition, the inner wall of the cap has been matted so that the light is reflected when it is half-closed and does not hit the contents.

  Hereinafter, embodiments of the present invention will be described. However, it is not limited to the following matters.

  FIG. 1 shows an example of a highly viscous dental viscous material-filled syringe 1A according to the present invention. This dental viscous material-filled syringe 1 </ b> A includes a cylinder 2, an extrusion rod 3, and a core 4. The cylinder 2 is filled with a dental viscous material 5 as shown in FIG. 2, and is divided into a main body 2a and a tip 2b.

  The main body 2a of the cylinder 2 has a cylindrical shape. A male screw 6 is formed on the outer surface on the front end side of the main body 2a, and a holding portion 7 having a roundness and a recess is formed on the outer surface on the rear end side in order to improve handling and gripping properties of the cylinder 2, and this holding A female screw 8 is formed on the inner surface of the portion 7 to which a male screw 15 on the outer surface of the push rod 3 described later is screwed.

  The front end portion 2b of the cylinder 2 has a cylindrical shape having substantially the same diameter as the main body portion 2a. A fitting portion 9 and a nozzle 10 having a diameter smaller than the outer diameter of the front end portion 2b are formed on the front end side of the front end portion 2b, and a female screw into which the male screw 6 of the main body portion 2a is screwed on the inner surface of the rear end side. 11 is formed. A cap 12 is integrally attached to the distal end portion 2b via a hinge 13. The opening end of the cap 12 is fitted into the fitting portion 9 so as to cover the nozzle 10. As shown in FIG. 2, the closed end of the cap 12 has a shape that projects from the outer peripheral edge P at the most distant point from the hinge 13 toward the outer peripheral edge opposite to the outer peripheral edge P, and protrudes toward the distal end side. The finger hooking projection 14 is formed.

  As shown in FIGS. 3 and 4, the hinge 13 includes a pair of first pieces 13 a and 13 b and a second piece 13 c positioned between the pair of first pieces 13 a and 13 b. As shown in FIG. 5A, the first pieces 13a and 13b are provided near the tip of the cylinder 2, and are formed by connecting an arm extending from the cylinder 2 side and an arm extending from the cap 12 side by a thin portion X. . The second piece 13c is provided behind the cylinder 2 relative to the first pieces 13a and 13b, and a thin arm extending at a right angle from the cylinder 2 side and a thin arm extending at a right angle from the cap 12 side are substantially U-shaped thick. Are connected by the spring portion Y. As shown in FIG. 5 (B), the spring force of the second piece 13c can be changed by changing its thickness, opening angle, and mounting position.

  As shown in FIG. 4C, when the cap 12 rotates around the thin portion X of the pair of first pieces 13a and 13b from the state in which the cap 12 is closed, the hinge 13 springs the second piece 13c. When the portion Y opens and the cap 12 opens about 90 °, the spring portion Y of the second piece 13c quickly returns to the original state, and the cap 12 is formed to be stationary at the point where the cap 12 is opened about 180 °. Has been. Since the spring portion Y of the second piece 13c is thick and has a large spring force, the opening / closing operation can be quickly performed, and the cap 12 can be stably maintained in the open state, and the dental viscous material 5 is extruded. The cap 12 never closes inside.

The hinge 13 is not limited to that shown in FIGS. 5A and 5B, and the hinge 13 shown in FIGS. 5C and 5D can also be used. Those shown in FIG. 5 (C), a pair of first strip 13a having a foldable thin wall portion X ₁ in two directions, 13b and, the pair of first strip 13a, positioned by one direction between 13b only having thereon a second piece 13c having a foldable thin wall portion X ₂ at substantially the same position, when the cap 12 is rotated about the thin portion X ₂ of the second piece 13c, the first strip 13a, in the thin portion X ₁ and 13b is changed is reversed to the bending direction, which enables the maintenance of an open state and rapid opening and closing. Similarly, as shown in FIG. 5 (D) located between 1 and the pair of first strip 13a, 13b having a thin portion X ₁ capable folded only in the direction, the pair of first strip 13a, 13b only one direction and which was provided at a position spaced slightly before a second piece 13c having a foldable thin wall portion X _2, the cap 12 is first piece 13a, around the thin portion X ₁ of 13b when rotated, that the thin portion X ₂ is bending direction by inversion of the second strip 13c is changed, which enables maintenance of an open state and rapid opening and closing. Particularly preferred are FIGS. 5A and 5B.

  On the other hand, the main body 2a and the front end 2b of the cylinder 2 are connected and fixed by screwing the male screw 6 of the main body 2a and the female screw 11 of the front end 2b. The connection may be fixed by welding or biting. Among these, screwing is preferable.

  The push rod 3 is formed with a male screw 15 that is engaged with the female screw 8 of the main body 2a of the cylinder 2 over almost the entire length. A protrusion 16 that fits into a core 4 to be described later is formed at the front end of the push rod 3, and a handle 17 for rotating the push rod 3 is provided at the rear end.

  The core 4 is accommodated in the cylinder 2 and has a recess 18 into which the protruding portion 16 of the push rod 3 is fitted on the rear end side. The core 4 moves to the tip end side of the cylinder 2 as the push rod 3 rotates, and serves as a piston for extruding the dental viscous material 5 press-fitted into the cylinder 2.

  Each component described above is made of resin or polypropylene containing a pigment having a shielding effect against light irradiation, such as a black pigment, and is manufactured by injection molding.

  Next, the assembly of the dental viscous material-filled syringe 1A having the above-described configuration and the filling method of the dental viscous material 5 into the cylinder 2 will be described.

  First, the core 4 is inserted into the main body 2a of the cylinder 2 from the tip thereof, and the dental viscous material 5 is press-fitted from the tip side, and the core 4 is moved to the rear end side and filled with a certain amount. Since this operation is performed through the tip opening of the main body 2a having a diameter larger than that of the nozzle 10, even a material having a high viscosity can be easily and quickly press-fitted. Then, the push rod 3 is screwed into the holding portion 7 of the main body 2 a of the cylinder 2, and the protruding portion 16 at the tip thereof is fitted into the concave portion 18 of the core 4. Subsequently, the tip 2b of the cylinder 2 integrated with the cap 12 via the hinge 13 is screwed into the main body 2a to be connected and fixed. A predetermined label is affixed on the entire circumference of the boundary between the main body 2a and the tip 2b of the cylinder 2 to be blinded. As a result, the aesthetic feeling is not impaired, and the assembled portion is prevented from loosening.

  Such press-fitting of the dental viscous material 5 from the front end side does not give excessive stress to the material and prevents air bubbles from being mixed in, so that the material is not deteriorated and is stored very well. It is possible to provide stability and maintain the characteristics of the original dental viscous material 5 such as color developability, color tone, and texture.

  In order to use this dental viscous material-filled syringe 1A, the cap 12 can be opened by holding the cylinder 2 with one hand and hooking and pushing the thumb on the finger hooking projection 14 of the cap 12. At this time, since the cap 12 is stationary with the opening of about 180 ° by the action of the hinge 13 described above, it does not interfere with the extruding operation of the dental viscous material 5. Next, when the handle 17 of the push rod 3 is rotated with the other hand, the push rod 3 enters the inside of the cylinder 2 and the core 4 moves toward the tip side. Thereby, the dental viscous material 5 inside the cylinder 2 is pushed out from the nozzle 10. Since the extrusion amount of the dental viscous material 5 can be adjusted by the number of rotations of the handle 17, a desired amount can be accurately obtained.

  The extruded dental viscous material 5 is once placed on a pasteboard and then used little by little with the instrument, or the dental viscous material 5 extruded from the nozzle 10 is directly taken with the instrument and used. . After use, while holding the cylinder 2 with one hand, put the thumb on the finger hooking projection 14 of the cap 12 and press the cap 12 back in the closing direction so that the opening edge of the cap 12 is fitted to the fitting portion 9 of the cylinder 2. And the cap 12 can be closed.

  Although the following is an example and the present invention is not limited to this, the dental viscous material-filled syringe 1A of the present embodiment has the cap 12 integrally attached to the tip 2b of the cylinder 2 via the hinge 13, and the cap is held with one hand. 12 can be opened and closed, so that in dental treatment work and technical work, the time during which the dental viscous material, which is the contents of the syringe, is exposed to light can be shortened to prevent deterioration, and the work can be performed quickly. . That is, for a dentist or technician to use alone, first, hold the syringe 1A in the left hand and the instrument in the right hand, and open the cap 12 of the syringe 1A with the left hand (one hand) and use the instrument to Is scraped off and the cap 12 is capped with the left hand (one hand), then the contents of the instrument are used in the oral cavity and photocured. In order for the dentist and hygienist to use the syringe 1A by two people, the hygienist first waits with the syringe 1A in his left hand and the left finger on the cap 12, and the hygienist at the required time. When the cap 12 of the syringe 1A is opened with the left hand (one hand) and the dentist scrapes the contents of the syringe 1A with the instrument, the hygienist wears the cap 12 with the left hand (one hand) and the dentist removes the instrument. The contents are used in the mouth and photocured. In addition, since it can prevent that the content of syringe 1A hits and degrades as mentioned above, the highly sensitive dental viscous material which was not able to be used with the conventional syringe can also be press-fitted and used.

  FIG. 6 shows an example of a low-viscosity dental viscous material-filled syringe 1B of the present invention. The syringe 1B is substantially similar to the high-viscosity dental viscous material-filled syringe 1A shown in FIG. 1 except that the main body 2a of the cylinder 2 and the shape of the extrusion rod 3 are different and there is no core. Corresponding portions are denoted by the same reference numerals, and description thereof is omitted.

  The main body 2a of the cylinder 2 has no female screw 6 like the dental viscous material-filled syringe 1A on the inner surface, and a pair of projections 21 for hooking the index finger and the middle finger at the rear end. Further, the push rod 3 does not have a male screw 15 like the dental viscous material-filled syringe 1 </ b> A, and has a diameter smaller than the inner diameter of the main body 2 a of the cylinder 2. An O-ring 22 that comes into contact with the inner surface of the main body 2a is attached to the tip of the push rod 3 and serves as a core or piston for extruding the dental viscous material 5 filled in the cylinder 2. A pair of protrusions 23 for pressing the thumb is formed at the rear end of the push rod 3.

  The opening and closing of the cap 12 of the dental viscous material-filled syringe 1B can be performed with one hand with one touch, as in the case of the high viscosity dental viscous material-filled syringe 1A. Next, the index finger and the middle finger are hooked on the protrusion 21 of the cylinder 2, the thumb is pressed against the protrusion 23 at the rear end of the push rod 3 and the push rod 3 is pushed, so that the dental viscous material 5 inside the cylinder 2 is discharged from the nozzle. Extruded.

  In addition, in the above embodiment, the tip portion 2b with a cap of the cylinder 2 is different in the nature of the dental viscous material 5 or a different diameter of the nozzle 10 according to the amount of use to be used. Can be manufactured and installed.

  In the embodiment, as the hinge 13 of the cap 12, the holding type composed of the first pieces 13a, 13b and the second piece 13c is used, but it may be composed of a single piece. However, it is preferable that the hinge structure can open and close the cap 12 quickly and can open the cap 12 to about 180 °.

  Further, the cap 12 is preferably capable of covering the nozzle 10 so that the light exposed to the contents exposed from the nozzle 10 when half-closed is not directly applied. The inner wall of the cap may be matted so that the light is reflected and does not hit the contents when half-closed. Providing a cap on the inside of the cap is undesirable, especially when the contents are a highly viscous material. This is because, after the high-viscosity material is pushed out and capped, the high-viscosity material may come out of the nozzle due to the residual pressure to push open the cap and open the cap. Therefore, it is preferable to determine the nozzle length and provide a space between the nozzle tip and the cap so that the contents of the high-viscosity material produced by the residual pressure do not contact the cap.

The disassembled front view of the high-viscosity dental viscous material filling syringe of this invention. Sectional drawing of the front-end | tip part of the syringe of FIG. The perspective view of the front-end | tip part of the syringe of FIG. (A), (B) is the figure seen from the front-end | tip which shows the state which opened the cap of the syringe of FIG. 1, and (C) is a front view which shows the state which closed the cap of the syringe of FIG. The enlarged view of the hinge shown in FIG. 4 (B) and its modification. The disassembled front view of the low-viscosity dental viscous material filling syringe of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1A High-viscosity dental viscous material filling syringe 1B Low-viscosity dental viscous material filling syringe 2 Cylinder 2a Body part 2b Tip part 5 Dental viscous material 10 Nozzle 12 Cap 13 Hinge
14 Finger hook

Claims (4)

In a dental viscous material-filled syringe in which a high-viscosity dental viscous material filled in a resin cylinder is pushed out from a nozzle at the tip by rotating an extrusion rod screwed into the rear end of the cylinder ,
A cap for covering the nozzle is integrally formed at the tip of the cylinder via a hinge,
A dental viscous material-filled syringe characterized in that a space is provided between the tip of the nozzle and the cap, and a high-viscosity dental viscous material that has come out of the nozzle due to residual pressure is accommodated in the space.   2. The dental viscous material-filled syringe according to claim 1, wherein the closed end of the cap is formed of an inclined surface, and a finger hooking protrusion is provided at an end of the inclined surface. The cap covers the nozzle so that light is not directly applied to the contents exposed from the nozzle when the cap is half-closed so that the opening end of the cap does not fit into the fitting portion formed at the tip of the cylinder. The dental viscous material-filled syringe according to claim 1, wherein 4. The dental viscous material-filled syringe according to claim 3 , wherein the inner wall of the cap is subjected to a matte treatment.

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