JPH08173531A - Dental painless anesthetic apparatus - Google Patents

Abstract

PURPOSE: To reduce pain due to anesthetic needle inserting and injection of anesthetic solution. CONSTITUTION: This dental painless anesthetic apparatus is provided with a roughly cylindrical pressing syringe 10 having a head opening part 11 which is pressed on a gingival part and a free space 12 inside which an injection syringe is set in one body with the pressing syringe 10. This dental painless anesthetic apparatus has also an outer casing body 14 provided with the first finger position 13, a cartridge 20 as an injection syringe having an injection needle on one end and an movable plug 22 on the other end, a spring member 29 which supports the head part of the cartridge 20 and makes the injection needle 21 placed into the opening part 11, and a shaft 31 which is inserted into a bearing member 32 to be attached to the outer casing body 14. Also, a piston 34 is which a buffer device 33 for pushing the movable plug 22 is built in one end of the shaft 31 and a sliding member 30 provided with the second finger position 35 is attached on the other end of the shaft.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a painless anesthesia machine particularly suitable for dental anesthesia.

[0002]

2. Description of the Related Art Infiltrative anesthesia is used in order to make effective surgical treatments such as tooth extraction, pulp extraction, and other dentistry. The general method is a method in which an anesthesia needle is inserted from the alveolar mucosa toward the root of the tooth, and an anesthesia solution is injected under the periosteum to infiltrate the alveolar bone. There was considerable pain at the time of inserting the anesthesia needle, which was a discomfort point of dental treatment, but the pain sensation was densely distributed at the anesthesia point, and it was inevitable that pain was involved. Although it is said that this pain sensation extends to the periosteum, some people may cause a shock upon insertion, and some kind of countermeasure is desired.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its object is to reduce the pain sensation when inserting an anesthetic needle and slowly inject an anesthetic. By doing so, the patient does not feel pain.

[0004]

In order to solve the above problems, the present invention is directed to a tip opening portion 1 for blunting a sensation by pressing against a gingival part and compressing nerve tissue in that part.
1 has a substantially cylindrical compression tube 10 and a compression tube 10 connected to the other end of the compression tube 10 and integrally combined, and has a space 12 for setting a syringe therein, and a first finger for injection. Guess 13
A syringe body having an outer sheath body 14 and an injection needle 21 at the tip, and a movable stopper 22 for pushing out an anesthetic solution filled therein is provided in the other end opening portion, and the syringe set in the outer sheath body 14 is A spring member that is arranged between the constituting cartridge 20 and the tip end side of the compression cylinder and the tip end side of the cartridge, and holds the tip of the injection needle 21 in the tip opening 11 of the compression cylinder 10 before operation. 29, a shaft 31, and a shock absorber 33 for slidably attached to the base end of the outer cylindrical body 14 via a bearing member 32 in which the shaft 31 is fitted and for pushing the movable plug 22. With a sliding member 30 having a piston 34 at one end and a second finger rest 35 on the other end for applying a finger for injection, a means for constituting a dental painless anesthesia machine is taken. is there.

[0005]

By pressing the tip end opening 11 of the compression cylinder 10 against the gingiva, ischemia, compression, increase in internal pressure, and increase in gingival surface layer tension are caused. Since the compression cylinder 10 can move relative to the cartridge 20 by the spring member 29 interposed between the compression cylinder 10 and the cartridge 20, the compression cylinder 10 and the outer casing 1 are also covered when the gingiva portion is swelled by the injection of the anesthetic solution.
4 and the injection needle 21 is held in the gingiva.

[0006] When the injection needle 21 reaches the alveolar bone, a shock is generated. Since the shock is absorbed by the shock absorbing mechanism 33 built in the piston 34, the piston 34 can be slowly press-fitted thereafter. Even if the piston 34 is pushed too hard, the action of the built-in shock absorber 33 exerts only a certain pressure on the anesthetic solution, and a gentle injection can be performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a dental painless anesthesia machine according to the present invention will be described below with reference to the drawings. The anesthesia machine is generally composed of an outer shell 14 integrally combined with the compression cylinder 10, a cartridge 20, and a sliding member 30.

The compression cylinder 10 is for pressing against the gingiva and compressing the nerve tissue in that area to blunt the sensation. Therefore, the tip is a cylindrical thin tube portion 15 having a diameter capable of pressing the entire circumference against the gingival portion, and the edge of the end of the thin tube portion 15 serves as the tip opening 11. The tip opening 11 is chamfered and trimmed to prevent tissue damage and to fit the gingival surface (FIG. 4).

The other end of the compression cylinder 10 has a larger diameter in order to be connected and integrated with the outer jacket 14 so as to correspond thereto. In the illustrated example, the compression cylinder 10 and the outer jacket 14 have a threaded portion 16
They are connected by a and 16b. However, if necessary, the compression cylinder 10 and the outer jacket 14 may be integrally formed. The outer jacket 14 is a cylindrical member having a space 12 capable of accommodating the cartridge 20, and is provided at the other end or near the second member during injection.
A first finger rest 13 for placing a finger and a third finger is provided.
The finger rest 13 may be provided on a bearing member 32, which will be described later, or may be held between the outer jacket 14 and the bearing member 32.

The cartridge 20 is a part constituting a syringe for injecting an anesthetic solution into a tissue. In this example,
Disposable cylinder case 23 filled with anesthesia solution
A housing part 24 for accommodating the cylinder 23 for detaching and replacing
The holding frame 26 provided with is used. Cylinder case 23
Has at one end a sealing plug 25 which is pierced by the inner end 21 ′ of the disposable injection needle 21 protruding into the holding frame 26, and is pushed at the other end by a piston 34 described later to move. It has a movable stopper 22 for pushing out the anesthetic solution. Injection needle 21
Should be sharp enough to obey the all-or-nothing law of pain and be of the fineness necessary to limit the inflow of anesthetic fluid over time and to gently increase the internal pressure on the cells.

A replacement port 27 is opened on a side surface of the holding frame 26 to facilitate mounting and replacement of the disposable cylinder case 23. Similarly, an outer exchange port 27 'through which the cylinder case 23 is passed may be provided in the outer jacket body 14, thereby facilitating the handling.

The sliding member 30 is a portion for sliding the movable plug 22 of the cylinder case 23 by the piston 34. It has a shaft 31 of the required length and is held by the bearing member 32 attached to the proximal end of the jacket 14 so as to be slidable with respect to the jacket 14. The bearing member 32 is attached to the outer shell 14 by screw portions 17a and 17b.

At the tip of the sliding member 30, the above-mentioned piston 3 is attached.
4 is provided, the piston 34 has a built-in shock absorbing device 33, and can absorb an external force input from the injection needle 21 or the second finger rest 35. A shock absorber 33 for that purpose is shown in a mechanical model. This is a relative motion mechanism 36 having a cylinder 36b that causes a relative movement of a slide valve 36a attached to the shaft 31, and a relative movement mechanism 36 when the relative movement occurs. Orifice 37 for absorbing the momentum of movement
a, an absorption mechanism 37 including a spring 37b and the like, and a gas or liquid is sealed in the cylinder 36b (see FIG. 3). Therefore, it occurs when the movable plug 22 stops. The shock is absorbed by the absorption mechanism 37, and then the movable plug 22 is pushed by the piston 34 again.

A spring member 29 is arranged between the tip of the compression cylinder 10 and the tip of the cartridge 20. The spring member 29 is arranged at a position where the cartridge 20 is retracted, and the tip of the injection needle 21 is pressed against the compression tube 1 before the operation.
It is held in the tip opening 11 of 0. Further, the auxiliary spring member 39 acting in the direction of advancing the cartridge 20 is
It is arranged between the cartridge 20 and a member (for example, the bearing member 32) on the outer casing 14 side. The sub spring member 39 has a function of absorbing an external force applied to the injection needle 21, and also plays a role of holding the cartridge 20 together with the spring member 29.

The anesthesia machine according to the present invention thus constructed is in the state shown in FIG. 2 before the operation for anesthesia. By pressing the tip opening 11 against the affected area, the gingiva G in the cylindrical tip opening 11 as shown in FIG.
The bulge protrudes into the opening 11 to increase the tension of the superficial layer and increases the pressure inside the tissue to easily tear at the needle tip, so that the injection needle 21 is easily inserted.

When pushing the sliding member 30, a shock absorber 33
The cartridge 20 as a whole moves forward by a pushing force in a range where the injection needle 21 does not operate, and the injection needle 21 is inserted into the raised gingiva G. Moreover, the pushing force for insertion is alleviated by the auxiliary spring member 39, and a certain shock is generated when the tip of the injection needle 21 reaches the alveolar bone. This shock is mainly due to the shock absorber 33 built in the piston 34. It will be absorbed.

Generally, when the intensity of stimulation is increased, the action potential of the local response is also increased, but the action potential is hardly increased even if a certain level of stimulation is given. That is, the law of all or nothing is used for pain sensation. Therefore, use a thin and sharp injection needle 21,
As a result of accelerating the puncture speed, the pain sensation due to needle puncture is reduced, the inflow speed of the anesthetic is slow, the gingival tissue is not suddenly pressed, and the shock absorber 33 uses the piston 34 as described above. Since the pressing force of the anesthetic solution is made uniform, the overall pain is reduced.

[0018]

Since the present invention is constructed and operates as described above, prior to the insertion of the anesthesia needle 21, the gingival part is ischemized by the tip opening 11 and the nerve tissue is compressed,
Since the gingival surface layer is tensioned and the internal pressure is increased, the pain sensation associated with puncture is kept to a minimum,
In addition, the anesthetic is injected at a low speed little by little from the thin and sharp injection needle 21 under the action of the buffer device 33, so that the pain is not felt.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a dental painless anesthesia machine according to the present invention.

FIG. 2 is a vertical sectional view of the same.

FIG. 3 is an explanatory diagram of a shock absorber.

FIG. 4A is a cross-sectional view of a state in which the front end opening is pressed against the gingiva. (B) A sectional view of a state in which an injection needle is inserted into the tip opening.

Claims (5)

[Claims] 1. A substantially tubular compression tube 10 having a tip opening 11 for pressing the nerve tissue in the gingiva and pressing the nerve tissue in the area to blunt the sensation, and the other end of the compression tube 10. Has an empty space 12 for setting a syringe therein, which is combined with one another and has a sheath 14 having a first finger rest 13 for injection, and an injection needle 21 at the tip,
A cartridge 20 which has a movable stopper 22 for pushing out an anesthetic solution filled inside and which constitutes the syringe set in the outer casing 14 and has a movable stopper 22 in the other end opening portion, a distal end side in a compression cylinder and a distal end of the cartridge. And a spring member 29 for holding the tip of the injection needle 21 in the distal end opening 11 of the compression barrel 10 before operation and a shaft 31 and a bearing member 32 fitted and inserted therein. Firstly, a piston 34 slidably mounted on the proximal end of the outer cylinder body 14 for pushing the movable plug 22 and having a shock absorber 33 built in is provided at one end, and a finger is put on for injection. A painless anesthesia machine for dental use comprising a sliding member 30 having a second finger rest 35 provided at the other end. 2. The compression cylinder 10 has a small-diameter cylindrical thin cylinder portion 15 which can be pressed against the gingiva portion at the tip, and the entire circumference thereof is the tip opening 11. The dental painless anesthesia machine described. 3. The cartridge 20 comprises a container 2 for accommodating a disposable cylinder case 23 filled with a chemical solution.
4. A holding frame 2 having an inner end 21 ′ of an injection needle 21 having an injection needle 21 through which a sealing plug 25 at the tip of a cylinder case is inserted.
The dental painless anesthesia machine according to claim 1, further comprising: 4. The shock absorber 33 includes a piston 34 and a shaft 31.
Relative movement mechanism 36 that enables relative movement with respect to, and absorption mechanism 37 that absorbs the momentum of the movement when a relative movement occurs.
The dental painless anesthesia machine according to claim 1, which is constituted by 5. The injection needle 21 is of a fineness necessary for complying with the rule of pain sensation or not, and for limiting the inflow rate of anesthesia solution per hour, and for gently increasing the internal pressure on cells. The dental painless anesthesia machine according to claim 1.