JP2777996B2 - Dental painless anesthesia machine - Google Patents

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 Infiltration anesthesia is used to make tooth extraction, medulla extraction and other dental surgical procedures effective. The usual method is to insert an anesthesia needle from the alveolar mucosa toward the root of the tooth, inject an anesthetic solution below the periosteum, and infiltrate the alveolar bone. There was considerable pain at the time of anesthesia needle stimulation, which was an unpleasant point of dental treatment. However, pain distribution is dense at the point of anesthesia, and pain is inevitable. Although this pain sensation is said to extend to the periosteum, some people may cause a shock by piercing, and some measures are desired.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above points, and its object is to make the pain sensation slow at the time of insertion of an anesthesia needle and to inject an anesthetic slowly. This is to keep the patient from feeling pain.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a tip opening 1 for pressing a gingival part and compressing nervous tissue in that part to dull the sensation.
Combined in a substantially cylindrical compression cylinder 10 and integral with it having 1 has a cavity 12 for setting the syringe therein, or
One the overcoat member 14 having a first finger rest 13 projecting laterally to support against the fingers during the injection, the needle 2 to the distal end
1 and a movable stopper 22 for extruding an anesthetic solution filled therein in the opening at the other end, and a cartridge 20 constituting the syringe set in the mantle body 14; A spring member 29 that is disposed between the side of the cartridge and the distal end of the cartridge and retains the tip of the injection needle 21 in the distal opening 11 of the compression barrel 10 before operation, and a shaft 31.
A piston 34 having a built-in shock absorber 33 for pushing the movable plug 22 is provided at one end of the piston 34 slidably attached to the base end of the outer cylinder 14 via a bearing member 32 into which the piston 34 is inserted. A means for constituting a painless dental anesthesia machine with the sliding member 30 provided at the other end with a second finger pad 35 for applying a finger for injection is provided.

[0005]

When the distal end opening 11 of the compression unit 10 is pressed against the gingival part, ischemia, compression, an increase in internal pressure, and an increase in the gingival surface tension are caused. Since the compression unit 10 can move relative to the cartridge 20 by a spring member 29 interposed between the compression unit 10 and the cartridge 20, when the gingival part is increased by the injection of an anesthetic solution, the compression unit 10 is also moved to the mantle 1
4, and the injection needle 21 alone is held in the gingiva.

[0006] Injection needle 21 reaches the alveolar bone, but result in shock, the shock is absorbed by the buffer device 33 incorporated in the piston 34, it can be pressed into the subsequent slow piston 34. Even if the excessively pressed strongly piston 34, by the action of a built-in shock absorber 33, the anesthetic liquid can be carried a mild injection only takes a constant pressure.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a dental painless anesthesia machine according to the present invention. This anesthesia machine is generally composed of an outer casing 14 integrally combined with the compression unit 10, a cartridge 20, and a sliding member 30.

[0008] The compression cylinder 10 is for pressing the gingival part to compress the nerve tissue in that part, etc., so as to reduce the sense. For this reason, the distal end is a cylindrical thin cylindrical portion 15 having a diameter capable of pressing the entire circumference against the gingival portion, and the end edge of the narrow cylindrical portion 15 becomes the distal end 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 is enlarged in diameter in order to be connected and integrated with the mantle 14. In the illustrated case, the compression barrel 10 and the mantle body 14 have a threaded portion 16.
a and 16b. However, if necessary, the compression barrel 10 and the mantle 14 may be formed integrally. Overcoat member 14 is a cylindrical member having a cavity 12 capable of accommodating the cartridge 20, the first finger contacting the order to grip the other end or near, the overcoat member 14 against the finger during injection 13
Is provided. The finger pad 13 is used for a bearing member 3 described later.
2 may be provided, or may be arranged so as to be sandwiched between the mantle 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 case,
Disposable cylinder case 23 filled with anesthetic liquid
The accommodating part 24 for accommodating the cylinder 23
Is used. Cylinder case 23
Has a stopper 25 at one end that is pierced by the inner end 21 ′ of the disposable injection needle 21 protruding into the holding frame 26, and is moved by being pushed by a piston 34 described later at the other end. It has a movable stopper 22 for pushing out an anesthetic solution. Injection needle 21
Should be sharp to obey the all-or-nothing law of pain sensation and of the fineness necessary to limit the hourly inflow of anesthetic fluid and to moderately increase the internal pressure on the cells.

To facilitate the mounting and replacement of the disposable cylinder case 23, a replacement port 27 is opened on the side of the holding frame 26. Similarly, an outer exchange port 27 'through which the cylinder case 23 passes may be provided in the outer casing 14, thereby further facilitating the handling.

The sliding member 30 is a part for sliding the movable stopper 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 mounted on the proximal end of the mantle 14 so as to be slidable with respect to the mantle 14. In addition, the bearing member 32 is attached to the mantle body 14 by the screw portions 17a and 17b.

The tip of the sliding member 30 has the piston 3
4, the piston 34 has a built-in shock absorber 33, and can relieve an external force input from the injection needle 21 or the second finger pad 35. When showing the shock absorber 33 for the in dynamical model, this is a sliding valve 36a attached to the shaft 31, the relative movement mechanism 36 and a cylinder 36b that makes it rise to relative movement, the relative movement has occurred Sometimes it has an orifice 37a for absorbing the momentum of its operation, an absorption mechanism 37 composed of a spring 37b and the like, and a gas or liquid is sealed in a cylinder 36b (see FIG. 3). Thus once absorbed by the absorbing mechanism 37 raw <br/> Ji Resid Yokku when the movable stopper 22 is stopped, then so that the re-pressing the movable plug 22 by the piston 34.

A spring member 29 is disposed between the distal end of the compression barrel 10 and the distal end of the cartridge 20. The spring member 29 is disposed at a position where the cartridge 20 is retracted, and the tip of the injection needle 21 is moved to the compression cylinder 1 before operation.
0 is held in the front end opening 11. Further, a sub-spring member 39 acting in a direction to advance the cartridge 20 is provided.
It is arranged between the cartridge 20 and a member (for example, the bearing member 32) on the outer cover 14 side. The auxiliary spring member 39 has a function of absorbing an external force applied to the injection needle 21, and also serves to hold the cartridge 20 together with the spring member 29.

The anesthesia machine according to the present invention thus configured is in a state shown in FIG. 2 before the operation for anesthesia. From this state, the anesthesia machine is supported by two fingers with the first finger pad 13 and the distal end opening 11 is pressed against the affected part. It came ischemia, pressure, an increase in internal pressure thereby.
Also, increasing the surface tension to protrude FIG gingiva G in the opening portion 11 as rise in the cylindrical front end opening portion 11 as shown (a), a and in increasing the pressure inside the tissue needlepoint Since the needle 21 is easily torn, the piercing property of the injection needle 21 is facilitated.

The sliding member 30 is operated by operating the second finger pad 35.
Is pressed, the cartridge 20 advances as a whole with a pressing force in a range where the shock absorber 33 does not operate, and the injection needle 21 is inserted into the raised gingiva G. Injection needle 21
When the tip of the skull reaches the alveolar bone, a certain shock occurs,
The shock that the that Do is absorbed mainly by the piston 34 shock absorber 33 built in.

In general, the action potential of the local response increases as the intensity of the stimulus increases, but the action potential hardly increases even when a certain level of stimulus is given. That is, the rule of all or nothing is used for pain sensation. For this reason, a thin and sharp injection needle 21 is used,
Results hastened insertion speed, pain by injection HaritogeIri is reduced, and note input speed of the anesthetic is slow, without imposing a sudden pressure to the gum tissue, the buffer device 33 as the piston 34 The pressing force of the anesthetic solution is made uniform, so that the overall pain is reduced.

The above injection process is listed in time series.
Compression by compression cylinder 10 to make painless → thin and sharp needle 2
1 was stimulated into the gingiva at a high speed.
Absorption of shock → A fine and sharp needle 21 and piston 34
A sharp injection of anesthetic fluid is performed in a series. Departure
Ming systematically implements the above series of processes.
It can be said that it is a device for performing.

[0019]

Since the present invention is constructed and functions as described above, the gingival part is ischemized by the distal end opening 11 prior to the insertion of the anesthesia needle 21, and the nerve tissue is compressed.
As the gingival surface is strained and the internal pressure is increased, pain associated with puncture is minimized,
In addition, since the anesthetic is injected little by little at a low speed from the thin and sharp injection needle 21 under the action of the buffer device 33, there is an effect that pain is not felt.

[Brief description of the drawings]

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

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

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

FIG. 4A is a cross-sectional view of a state where a distal end opening is pressed against a gingival part. (B) Sectional drawing of the state which injected the injection needle in the front-end | tip opening part.

Claims (5)

(57) [Claims] 1. A substantially cylindrical compression cylinder 10 having a distal opening 11 for dulling a sensation by pressing against a gingival part and compressing nervous tissue in that part, and a compression cylinder combined with the compression cylinder and an internal syringe. It has a cavity 12 to set, and projecting laterally to support against the fingers during the injection
And a movable stopper 22 having an injection needle 21 at the tip thereof and for extruding an anesthetic solution filled therein in the opening at the other end. A cartridge 20 constituting the syringe set in the
A spring member 29 is disposed between the distal end side of the compression barrel and the distal end side of the cartridge, and retains the tip of the injection needle 21 in the distal end opening 11 of the compression barrel 10 before operation. A piston 34 having a built-in shock absorbing device 33 for pushing the movable plug 22 is attached to one end of the outer cylindrical body 14 slidably via a bearing member 32 into which the piston 34 is fitted. And a sliding member 30 provided at the other end with a second finger pad 35 for applying a finger for injection. 2. The compression barrel 10 is separate from the mantle 14.
Ri has a small diameter cylindrical tube member 15 which can be pressed against the gingival portion to the distal end of the compression unit 10, the dental entire circumference Claim first term has a distal opening 11 For painless anesthesia machine. 3. The cartridge 20 contains a disposable cylinder case 23 filled with a chemical solution.
A holding frame 2 having an inner end 21 ' of a syringe needle 21 through which a stopper 25 at the tip of a cylinder case is pierced.
The dental painless anesthesia machine according to claim 1, comprising: 4. The shock absorber 33 includes a piston 34 connected to the shaft 31.
Relative movement mechanism 36 which makes it possible to move relative to the head, and absorption mechanism 37 which absorbs the momentum of the relative movement when it occurs.
The dental painless anesthesia machine according to claim 1, comprising: 5. The injection needle 21 must be of the fineness necessary to obey the law of all or no pain sensation and to limit the flow of anesthetic fluid per hour and to moderately increase the internal pressure on the cells. The dental painless anesthesia machine according to claim 1.