JP4133142B2 - Dental injector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dental injector configured to extrude dental material contained in a barrel.
[0002]
[Prior art]
The injector has a cylindrical barrel having an opening for filling the containing substance at the base end and a spout for discharging or discharging the containing substance at the tip, and the tip is located in the barrel. The base end portion includes a plunger projecting outward from the base end opening of the barrel, and the contained substance can be pushed out from the spout by sliding the plunger toward the barrel distal end side.
[0003]
By the way, the dental injector uses a paste-like substance such as a dentifrice, a tooth surface treatment material, an adhesive, a sealant material, an impression material, and a restoration material as a contained material, and therefore, relatively when the contained material is discharged. A large pressing force is required.
[0004]
From this point of view, the conventional dental injector is provided with a grip formed integrally with the barrel.
Since the grip can be used as a grip when the plunger is pushed toward the barrel tip side, the user can easily pour out the contained material.
[0005]
However, the conventional dental injector has a disadvantage in terms of operability because the grip is integrally formed with the barrel.
That is, the dental injector is mainly used in a limited space such as in the oral cavity. In the work in such a limited space, there is a problem that the grip may become an obstacle and the operability is deteriorated.
[0006]
Moreover, in a dental injector, a dispensing nozzle in which a spout is displaced from the axis of the cylindrical barrel may be provided as an administration member attached to the tip of the cylindrical barrel.
In such a case, if the grip is formed integrally with the cylindrical barrel, the relative position in the circumferential direction between the dispensing nozzle and the grip cannot be adjusted, and the following inconvenience arises.
That is, the pouring nozzle is mounted so as not to rotate relative to the cylindrical barrel. Further, the grip formed integrally with the cylindrical barrel is also not rotatable relative to the cylindrical barrel around the axis.
When the contained substance is dispensed using the conventional dental injector having such a configuration, the circumferential position of the grip is used when the dispensing nozzle is in an appropriate posture with respect to the portion to be dispensed. It is not always in a position that is easy for a person to hold. In other words, if the grip is placed at a position where it can be easily gripped, the pouring nozzle cannot take an appropriate posture with respect to the portion to be poured out.
[0007]
Further, depending on the type of substance to be accommodated, the cylindrical barrel needs to be formed of a light shielding material. In such a case, since the cylindrical barrel is generally formed of a material that is not visible from the outside, there is a risk of misunderstanding in use.
In this regard, conventional dental injectors have not been fully considered.
[0008]
[Problems to be solved by the invention]
The present invention has been made to solve the above-described problems of the prior art, and an object thereof is to provide a dental injector with a simple structure that can improve operability in a limited work space. .
Another object of the present invention is to provide a dental injector that can reliably identify a contained substance when the cylindrical barrel is formed of a material in which the contained substance is not visible from the outside.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a cylindrical barrel having a distal end portion to which an administration member can be attached, a distal end portion located in the barrel, and a proximal end portion outside the proximal end opening of the barrel. A plunger that is inserted into the barrel so as to be axially movable and a grip that is detachably attached to the cylindrical barrel, and the grip is inserted through the shaft portion of the cylindrical barrel. A cylindrical portion having a central hole and having a cylindrical portion that is larger in diameter than the outer diameter of the shaft portion of the cylindrical barrel, while the cylindrical barrel is located at the center of the grip on the outer peripheral surface of the shaft portion A plurality of protrusions that are in sliding contact with the inner peripheral surface of the hole and are separated along the axial direction, the grip is rotatable around the axis, and the plunger has an outer diameter of the shaft portion. It has a smaller diameter than the inner diameter of the cylindrical barrel and A bulge is bulged radially outward, providing a dental syringe having a plurality of protruding portions spaced along the axial direction.
[0010]
Preferably, when the grip is attached to the cylindrical barrel, the grip is not movable in the axial direction and rotatable about the axis.
Moreover, in one aspect | mode, the pouring nozzle by which the spout was displaced from the axis line of the said cylindrical barrel can be provided as the said administration member.
[0011]
Preferably, the cylindrical barrel includes a shaft portion and a flange portion extending radially outward from a base end portion of the shaft portion, and the shaft portion has an engaging protrusion on an outer peripheral surface. The grip includes a cylindrical portion having a central hole through which the shaft portion can be inserted, and a grip portion extending radially outward from the cylindrical portion, and the grip includes the flange portion and the grip portion. The shaft is connected to the shaft portion so as to be rotatable about the axis while being held so as not to slide in the axial direction by the engagement protrusion.
[0012]
Further, when the cylindrical barrel is formed of a material from which the contained substance cannot be visually recognized from the outside, a grip having a color corresponding to the contained substance can be attached.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a preferred embodiment of a dental injector according to the present invention will be described with reference to the accompanying drawings. FIG. 1A shows a longitudinal side view of a dental injector 1 according to the present embodiment. FIG. 1 (b) shows an end view of the dental injector 1 with the following plunger 20 removed. Further, FIG. 2 shows an enlarged view of part II in FIG. 1 with the plunger 20 removed.
[0014]
The dental injector 1 according to the present embodiment is suitably applied to a liquid substance or a paste-like substance used in the dental field. Specific examples of liquid or paste-like substances used in the dental field include, for example, liquid or paste-like dentifrices, tooth surface treatment materials, etching materials, primer materials, bonding materials, sealant materials, and fluid opaque materials. Examples include materials, color tone improving materials, and composite ranges.
[0015]
Specifically, as shown in FIG. 1, the dental injector 1 is detachably mounted on a cylindrical barrel 10, a plunger 20 inserted into the cylindrical barrel 10, and the cylindrical barrel 10. And a grip 30.
[0016]
The cylindrical barrel 10 has a nozzle-shaped spout 11 at the distal end and a proximal end opening 12 serving as a containing substance filling inlet and the plunger insertion opening at the proximal end.
The distal end portion of the cylindrical barrel 10 is configured such that an administration member such as an injection needle or a nozzle can be attached. In the present embodiment, the dispensing member includes a dispensing nozzle 50 whose dispensing port is displaced from the axis of the cylindrical barrel. The pouring nozzle 50 includes, for example, a base end 51 along the axis of the cylindrical barrel 10 and a deflecting portion 52 deflected from the base end 51, with the tip being a deflection outlet. Part 52 may be provided.
Such a cylindrical barrel 10 can be formed of various materials, but can be formed of, for example, metal, glass, plastic or the like.
[0017]
In FIG. 3, the enlarged view of the base end part of the said cylindrical barrel 10 is shown.
As shown in FIGS. 1 to 3, the cylindrical barrel 10 includes a shaft portion 14 having the nozzle-shaped spout 11 and the proximal end opening 12, and a radially outer portion from the proximal end portion of the shaft portion 14. And an extended flange portion 15.
Further, the shaft portion 14 is provided with an engagement protrusion 16 projecting radially outward in the vicinity of the distal end side of the flange portion 15. In the present embodiment, a plurality of engaging protrusions 16 are provided along the circumferential direction.
[0018]
The plunger 20 has an axial line in the cylindrical barrel 10 such that the distal end portion is located in the cylindrical barrel 10 and the proximal end portion extends outward from the proximal end opening 12 of the tubular barrel 10. It is inserted in a freely movable direction.
Specifically, the plunger 20 is axially movable in the barrel 10 such that the distal end portion is located in the barrel 10 and the proximal end portion extends outward from the proximal end opening 12 of the barrel 10. A shaft portion (plunger main body) 21 to be inserted into the shaft portion, and an operation portion 22 connected to the base end portion of the shaft portion 21.
[0019]
Preferably, the outer diameter of the shaft portion 21 is smaller than the inner diameter of the barrel 10 and is a bulging portion bulging radially outward on the outer peripheral surface of the shaft portion 21 along the axial direction. A plurality of bulging portions 21a, 21b, and 21c separated from each other can be provided. The bulging portions 21 a to 21 c may have an outer diameter slightly smaller than the inner diameter of the barrel 10. Such bulging portions 21 a to 21 c function as guide members when the plunger 20 is moved in the axial direction in the barrel 10.
[0020]
A seal body 25 that is in fluid-tight sliding contact with the inner peripheral surface of the cylindrical barrel 10 is provided at the tip of the plunger 20.
In the present embodiment, the seal body 25 is integrally formed with the shaft portion 21 of the plunger 20.
[0021]
As described above, in the dental injector 1 according to the present embodiment, the contained substance is placed between the seal body 25 provided at the distal end portion of the plunger 20 and the nozzle-like spout 11 of the cylindrical barrel 10. An accommodating space is defined, and the operating substance 22 provided at the proximal end of the plunger 20 is pressed to push the plunger 20 toward the distal end side in the axial direction with respect to the cylindrical barrel 10. Can be discharged from the nozzle-shaped spout 11.
[0022]
4 (a) and 4 (b) show a side view and an end view of the grip 30, respectively.
As shown in FIGS. 2 and 4, the grip 30 includes a cylindrical portion 31 having a central hole 31 a through which the shaft portion 14 of the cylindrical barrel 10 is inserted, and radially outward from the cylindrical portion 31. And an extended grip 32.
In the present embodiment, the gripping portion 32 is constituted by a pair of gripping pieces that extend in the radial direction across the cylindrical portion 31, thereby reducing the grip size and improving the operability. ing. In addition, the code | symbol 33 of FIG. 4 is a reinforcement piece.
[0023]
The central hole 31 a has a larger diameter than the outer diameter of the shaft portion 14 of the cylindrical barrel 10 and a smaller diameter than the outer diameter of the flange portion 15 of the cylindrical barrel 10.
The central hole 31 a is provided with a rib 31 b that protrudes inward in the radial direction and elastically engages with the engagement protrusion 16. Preferably, the rib 31b is an annular rib extending in the circumferential direction.
[0024]
By inserting the grip 30 having such a configuration from the distal end side of the shaft portion 14 of the cylindrical barrel 10 and elastically engaging the rib 31b with the engaging protrusion 16, the grip 30 is engaged with the engaging protrusion 16. And the flange portion 15 are connected to the cylindrical barrel 10 so as to be relatively rotatable around the axis line in a state in which the flange portion 15 cannot slide in the axial direction.
[0025]
As described above, in the dental injector 1 according to the present embodiment, the grip 30 is connected to the cylindrical barrel 10 so as not to be slidable in the axial direction and to be rotatable about the axis. The effect of can be obtained.
That is, since the grip 30 can be rotated around the axis without rotating the cylindrical barrel 10 around the axis, only the grip 30 is moved to the desired position without changing the posture of other members when the contained material is poured out. This makes it possible to improve the operability of the dental injector that dispenses the contained substance in a limited space such as in the oral cavity.
[0026]
Such an improvement in operability is particularly remarkable when a dispensing nozzle 50 whose dispensing port is displaced from the axis of the cylindrical barrel is mounted as the administration member, as in the present embodiment.
That is, the pouring nozzle 50 is attached to the cylindrical barrel 10 so as not to be relatively rotatable by screw connection or the like. Therefore, in the conventional dental injector in which the grip is not rotatable relative to the cylindrical barrel, the following inconvenience occurs.
[0027]
That is, in the conventional dental injector, the position around the axis of the cylindrical barrel when the deflecting portion of the dispensing nozzle takes an appropriate posture with respect to the discharge site, and the grip take an appropriate position for the user. When the position around the axis of the cylindrical barrel is different, the relative position around the axis of the pouring nozzle and grip cannot be adjusted, and either one must be displaced from the optimum position.
[0028]
On the other hand, in the dental injector 1 according to the present embodiment, the grip 30 is rotatable relative to the cylindrical barrel 10 around the axis, so that the deflecting portion of the dispensing nozzle 50 can be used. The circumferential relative position of the grip 30 with respect to 52 can be adjusted as appropriate.
Therefore, the cylindrical barrel 10 or the plunger 20 is rotated around the axis so that the deflecting portion 52 of the dispensing nozzle 50 faces an appropriate portion while the grip 30 is positioned so as to be easily grasped by the user. be able to.
That is, in the dental injector according to the present embodiment, the circumferential relative position of the grip 30 and the dispensing nozzle 50 is positioned at a desired position while the spout is positioned in a work space such as the oral cavity. Can do.
Further, in the present embodiment, the circumferential relative position between the grip 30 and the dispensing nozzle 50 can be adjusted via a portion separated from the location where the contained substance in the oral cavity is to be poured out.
That is, in the present embodiment, the relative position in the circumferential direction between the grip 30 and the dispensing nozzle 50 can be adjusted at a position apart without contacting the work site in the oral cavity. It is valid.
[0029]
In the present embodiment, as described above, the grip 30 is detachable from the cylindrical barrel 10. Therefore, when pouring out in a limited space such as in the oral cavity, the grip 30 can be removed as necessary and / or desired, thereby improving the operability.
That is, depending on the portion where the contained substance is to be discharged, the grip 30 may become an obstacle even if the grip 30 is rotated to any position around the axis of the cylindrical barrel 10.
In such a case, in the dental injector 1 according to the present embodiment, the grip 30 can be removed, and the contained material can be discharged without difficulty.
In the dental injector 1 according to this embodiment, as described above, the engagement protrusion 16 and the flange portion 15 are provided at the proximal end portion of the cylindrical grip 10. The engagement protrusion 16 and the flange portion 15 can act as a grip portion when discharging the containing material with the grip 30 removed.
[0030]
Furthermore, it is necessary to form the cylindrical barrel 10 with a light-shielding material depending on the type of the contained substance. In such a case, generally, the cylindrical barrel 10 is formed of a material incapable of visually recognizing the contained substance from the outside, such as opaque black. Therefore, there is a risk of misidentification during use.
In this regard, in the dental injector 1 according to the present embodiment, since the grip 30 is detachable from the cylindrical barrel 10, the grip 30 having a different color depending on the type of the contained substance. Can be used.
In other words, the color of the grip 30 can be used as a means for identifying the contained substance, which can effectively prevent the misidentification of the contained substance when the cylindrical barrel 10 is formed of a light shielding material.
[0031]
Preferably, an annular projection 17 can be provided between the engaging projection 16 and the flange portion 15 on the shaft portion of the cylindrical barrel 10.
The annular protrusion 17 is configured to be in sliding contact with the inner peripheral surface of the center hole of the grip 30.
By providing such an annular protrusion 17, the contact area between the grip 30 and the cylindrical barrel 10 can be reduced, thereby reducing the sliding resistance when the grip 30 is rotated about the axis.
[0032]
【The invention's effect】
According to the present invention, since the grip that acts as a grip portion when discharging the contained material is detachable from the cylindrical barrel, operability in a limited space can be improved.
Further, when the cylindrical barrel is formed of a material in which the contained substance cannot be visually recognized from the outside, the contained substance can be identified by using grips of different colors.
Furthermore, when the grip is attached to the cylindrical barrel, the operability can be further improved if the grip is not movable in the axial direction and rotatable about the axis.
[Brief description of the drawings]
FIG. 1 (a) is a longitudinal sectional view of a dental injector according to an embodiment of the present invention.
FIG. 1 (b) is an end view of the dental injector with the plunger removed.
FIG. 2 is an enlarged cross-sectional view of a portion II in FIG. 1, showing a state in which a plunger is removed.
3 is an enlarged side view of a proximal end portion of a cylindrical barrel in the dental injector shown in FIG. 1. FIG.
4 (a) and 4 (b) are a side view and an end view of a grip in the dental injector shown in FIG. 1, respectively.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Dental injector 10 Cylindrical barrel 14 Shaft part 15 Flange part 16 Engagement protrusion 20 Plunger 30 Grip 31 Cylindrical part 32 Gripping part 50 Pouring nozzle

Claims (5)

A cylindrical barrel in which the administration member can be attached to the tip,
A plunger that is axially movably inserted into the barrel such that a distal end is located within the barrel and a proximal end extends outwardly from the proximal opening of the barrel;
A grip that is detachably attached to the cylindrical barrel ,
The grip is a cylindrical portion having a central hole through which the shaft portion of the cylindrical barrel is inserted, and includes a cylindrical portion whose diameter is larger than the outer diameter of the shaft portion of the cylindrical barrel. Is provided on the outer peripheral surface of the shaft portion with a plurality of protrusions which are in sliding contact with the inner peripheral surface of the center hole of the grip, and are separated along the axial direction, so that the grip can rotate about the axis. ,
Furthermore, the plunger has an outer diameter of the shaft portion smaller than the inner diameter of the cylindrical barrel, and is a bulging portion that bulges radially outward on the outer peripheral surface of the shaft portion. A dental injector comprising a plurality of bulges spaced along the axis . 2. The dental injector according to claim 1, wherein when the grip is attached to the cylindrical barrel, the grip is not movable in the axial direction and rotatable about the axis with respect to the cylindrical barrel. 3. The dental injector according to claim 2, wherein the dispensing member includes a dispensing nozzle displaced from an axis of the cylindrical barrel. The cylindrical barrel includes a shaft portion and a flange portion extending radially outward from a base end portion of the shaft portion,
The shaft portion has an engaging protrusion on the outer peripheral surface;
The grip includes a cylindrical portion having a central hole through which the shaft portion can be inserted, and a grip portion extending radially outward from the cylindrical portion,
2. The grip is connected to the shaft portion so as to be rotatable about an axis while being held in a non-slidable manner in the axial direction by the flange portion and the engagement protrusion. The dental injector according to any one of 3 above. The cylindrical barrel is formed of a material in which the contained substance cannot be visually recognized from the outside,
The dental injector according to any one of claims 1 to 4, wherein the grip has a color corresponding to a contained substance.

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