JPS59131361A - Dental syringe - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to dental syringes, and more particularly to syringes and
It relates to a dental syringe for ligamentous injections of the type comprising a container containing the substance to be injected and a piston for displacing the bottom of the container.

A syringe of this type has already been described, for example, in French Patent No. 1,583,163 in the name of the applicant.

However, such a syringe is not suitable as it is for injection into the ligament located between the jawbone and the teeth.

In fact, the distance between the bone and the tooth [yo narrow uXbX et al.
Insert a sharp and flexible needle, therefore a very high (main pressure) is required to successfully get the substance to be injected through the 111 of this needle. Must be.

Pressure alone applied to the piston with the palm of the hand, as in the case of ordinary syringes, is insufficient l/X0.The present invention therefore aims to provide a syringe for ligamentous injections which eliminates these disadvantages.

According to the invention, this result is achieved by a tooth of the type that includes a 21% needle, a container containing the object to be fired, and a piston for moving the container. In this case, the movement of the piston into the container is controlled by the user by means of a lug (1') (-) cooperating with a rack disposed on the piston;
It is obtained using a dental syringe characterized in that the pressure is increased by 730 degrees by hand.

Since the pressure applied by the user's hands is increased, the substance to be injected is easily pushed out of the container.

Moreover, the working conditions are better and the insertion is more accurate, even though the force applied by the user is much less than in prior art syringes.

According to a first embodiment of the invention, the substance to be injected is a liquid and is provided in a cartridge capsule as described in the above-mentioned earlier patent, i.e. in the form of a small rectangular tank, the rear end of the cartridge capsule being It consists of a movable disc, the front end of which is stuffed with a rubber stopper that can be pierced with a needle.

In this embodiment, the invention further provides protection between the cartridge capsule holder and the plug of the cartridge capsule against accidental rupture due to deformation of the plug by the pressure of the liquid contained in the cartridge capsule. It has a sleeve. According to the invention, this sleeve encircles the rear part of the needle by widening at the rear end to match the shape of the cartridge capsule holder, and the central part of this rear end is at the same level as the end of the needle, and the sleeve encloses the rear part of the needle. It has a protrusion that gently pushes back on the rubber stopper.

According to a second embodiment, the injectable product is in the form of a paste, and in this case, instead of the above-mentioned cartridge capsule, it is an injection tube whose front part is optionally curved projectively, To provide a container of PACE 1 whose rear part is a flexible stopper capable of withstanding the action of an auxiliary piston moving within the container holder and of a main piston within the syringe body. The adjustment spring moves this auxiliary piston away from this bung,
The path of these auxiliary screws 1 to 2 is set in the container boulder.
The individual ukes are delimited by the part.

In the first embodiment, the cartridge capsule is inserted from the rear of the holder, but in this second embodiment, because there is an auxiliary piston, insertion from the rear is not possible, so the container is attached to the front of the container holder. This is done through a formed opening.

The invention will be better understood from the following description with reference to the accompanying drawings.

First of all, referring to FIGS. 1 to 3, the first embodiment of the present invention, in which the syringe is for injecting liquid into a ligament, is explained in more detail.
let's see,.

This lifting platform, as a whole, can be used as a syringe 1 as shown in Figure 1.
is essentially a main body 2 to which an operating lever 3 of the syringe is connected.
, a cartridge capsule holder 4 into which a cartridge capsule 5 is passed, and a cap 6 including an injection needle 7. Cartridge Power Brel 5 is a well-known unit, Note IJl
It has the shape of a rectangular tank containing liquid.

It includes a rubber stopper 8 at the end of the barrel through which the rear part 9 of the needle 7 passes. Therefore, the contents of the cartridge capsule 5 can be partially used.

The bottom of the cartridge capsule 5 consists of a disk, which is movable and, as it moves, forces the liquid to be injected towards the injection needle 7.

The cartridge capsule holder 4 includes an opening 10 for monitoring the filling level of the cartridge capsule 5.

For example, the cartridge capsule holder 4 can be used to attach or remove the cartridge capsule 5 using an insertion means 11 which will not be described in detail since it has a well-known structure.
? IlfJ Kawano has 18 copies for the main body.

A cylindrical piston 12 slides inside the main body 2, and the piston 1
2 includes a longitudinal guide 13 that co-operates with a bin 14 fixed to the body 2. Therefore, the piston 12 cannot rotate about its longitudinal axis.

On the pi plane of the piston 12 parallel to the generatrix, form a rack 15 whose teeth are directed toward the rear of the syringe.

The operating lever 3, which preferably has a U-shaped cross section, is connected to the main body 2 as described above; in this case, the operating lever 3
are two half shafts 16 aligned and fixed on both sides of the main body 2.
Attach it so that it rotates around [). The lever 3 thus wraps around the body 2 by the side 11 of the articulation.

An opening 18 is made in the body 2 between the lever 3 and the body 2 at the same level as the area covered by the lever 3.

Mounted on the lever 3 is a pawl 19 that pivots about a shaft 20 fixed to the lever 3.

The spring 21 presses the pawl 19 on the one hand and the inner surface of the lever 3 on the other hand, pushing the lever 3 away from the body, on which it rests against the shoulder 22.

On the other hand, the lever 23 is taken so as to pivot around a shaft 24 fixed within the main body 2. One end 2 of lever 23
5 engages with the rack 15, and the other end includes a button 26 that protrudes outside the body 2 and is manually pressed by the user. The end 25 of the lever 23 engaged with the spring 27j and the rack 15
Push with one branch, and push the inside of lever 3 with the other branch.

When the button 26 is pressed, the end 25 of the lever 23
Move the pawl 19 away from the rack 15 and move the pawl 19 away from the rack 15.
Let go.

This syringe operates as follows. First, the piston 12 is placed in the position shown in FIG.

To do this, hold the syringe vertically - C1 with the needle up and press button 26. The piston 12 settles at the bottom of the main body 2 due to the weight of the pawl 19 and the end 25 of the lever 23.

The cartridge capsule 5 is then introduced into its holder 4 and hooked onto the body using the insertion means 11. The whole thing is now ready for use.

To do this, when you press the lever 3, you just have to press it repeatedly with your thumb, as if you were actually pumping the water (shaft 20 and shaft 16
-C move against. The pawl 19 pushes the rack 15 one step at a time, and the piston 12 in turn pushes against the rubber disc forming the bottom of the cartridge capsule 5. Therefore, the force of the finger pressing on the lever 3 is transmitted to the rubber disc and thus to the contents of the cartridge capsule 5 with a multiplication factor of, for example, about 5.

As soon as the user releases the pressure on the lever 3, the lever 3 returns to the high position under the action of the spring 21. During this time, the end 25 of the lever 23 holds the screw 12 in place. When the operation is then repeated, the piston 12 moves one or more pitches of teeth with each pressure applied to the lever 3. move forward by the distance.

In the embodiment of FIG. 1, the injection needle 7 is attached to the cap 6. In the embodiment of FIG. The cap 6 may be joined to the holder 4 or alternatively may be attached in a replaceable manner, for example using bayonet means.

In the modification shown in FIG. 2, it is preferable that the cap 28 for supporting the injection needle be replaceably mounted.

In this variant, the needle is inclined with respect to the axis of the syringe, making certain injections easier.

In this case, proceed as follows. That is, the needle is placed in the cartridge capsule holder, the cartridge capsule is hooked onto the cartridge capsule holder syringe body, and the injection is performed.

In this case, a circle 111 is placed inside the cartridge capsule boulder 4 so that the rear part of the needle fully encloses the cartridge capsule 5.
A cylindrical member 33 having a shaped hole may also be used. The polygon 1 then slides within the cone in such a way that its rear part 9 is always substantially parallel to the longitudinal axis of the cartridge capsule 5.

In the modified example shown in FIG. Press the back of the working lever 3' and press them and the pawl 19.
′ in place.

When the user presses the lever 3', the piston 12 is advanced by a mechanism similar to that described above. When the pressure is released,
A spring-acted tongue 29 returns the lever 3' to the high position.

To release the pawl 19' and the lever 13' from the rack 5 of the piston 12, the lever 3' can be raised above its equilibrium position determined by the rest position of the tongue 29.

Then, the contact surface 31 of the lever 3' contacts the surface 3 of the lever 23'.
2 and rotate the lever 23' while releasing it from the rack 15.

Next, FIGS. 4 and 5 show a modified example in which the cartridge capsule is provided with a protective sleeve. A sleeve 3G is provided that surrounds the rubber stopper 8 of the cartridge capsule 5. As shown in the figure, the sleeve 36 expands in the shape of a morning glory at the rear, and has a protrusion 37 around the hole 17 that pushes back the rubber stopper 8, so that the cartridge capsule holder 4 Contact the surface in front of the

The primary purpose of this protrusion 37 is to prevent the rubber stopper 8 from bulging out under the pressure of the liquid.

When the rubber plug 8 bulges out, the needle 7 is particularly bent in projection.
(Fig. 2), there is a risk of cracking in the rubber stopper 8.

In addition, when the amount of liquid in the car 1 to the lid capsule 5 increases, the resultant force of the pressure acting on the rubber stopper 8 at the moment of use is the force F1 acting diagonally and the force F1 acting diagonally toward the needle, as shown in Figure 5. It is decomposed into the force F2 acting on In other words, the rubber stopper 8 can push the needle 7 very strongly at the moment of use, thereby avoiding leakage.

Now, in the second aspect of the present invention, the injectable product is in the form of a paste.
Please refer to FIGS. 6 and 7, which show an embodiment of the present invention.

40 designates a container holder similar to the cartridge capsule holder 4 of the first embodiment apart from the front part, this container holder 40 having a generally cylindrical shape and having a container 4 inside.
1 and a housing in which the auxiliary piston 46 is arranged.

Container 41 contains a paste-like material and includes a relatively thick-walled, generally cylindrical body 42 and a tapered injection tube 43 that extends beyond the front end 44 of container holster 40 .

The rear portion of this container 41 is closed with a flexible stopper 45.

The auxiliary piston 46 has the same diameter as the stopper 45, and its rear part 41 protrudes outward from the container holder 40.
0 comes into contact with the main piston 12 (not shown in FIGS. 6 and 7) when it is hooked onto the body 2 of the syringe by means of the insertion means 11. This auxiliary piston 46 is attached to the rear of the compression spring 48'r. That is, the compression spring 48 is pressed.
At the front, forward axial movement was restrained by a shoulder 50 arranged in the container holder 40 and cooperating with a corresponding stop 51 of the container holder 40. The ring 49 presses on the shoulder 52 of the auxiliary piston 46 with its rear part. The auxiliary piston 46 is therefore at rest ffp'Q in the position shown in the figure.

Since it is impossible to introduce the container 41 into the container holder 40 from the rear due to the auxiliary piston 46, the container 41 is installed through a frontage 53 formed vertically from the front end 44 of the container boulder 40 to the stop 51. For this one, ring 49
has a beveled portion 54 that facilitates this insertion and helps hold the container 41 in place.

The way the device works is the same as in FIGS. 1 and 2. Since the container boulder 40 loaded with the container 41 is latched onto the syringe body by applying manual pressure, the user advances the main piston 12 pitch by pitch, which resists the compression spring 48 and prevents its movement. is transmitted to the auxiliary piston 46. The auxiliary piston 46 comes into contact with the stopper 45 and pushes it progressively into the interior of the container 41 in a certain direction. The plug 45 acts as a piston for the paste, which is gradually forced into the injection tube 43 and from there slowly pushed out into the area of use. For example, by applying a series of pressures to the lever of a syringe, a user can easily force pasty amalgam into a tooth cavity.

The modification shown in FIG. 7 is an example in which the front end 44' of the container holder 40 is modified so that an injection tube 43' oblique to the axis of the device can be used.

[Brief explanation of drawings]

FIG. 1 is a longitudinal partial cross-sectional view of a dental syringe according to a first practical IM aspect of the present invention, and FIGS. 2 to 4 are explanatory views showing modifications of the embodiment shown in FIG. 1. second
The figure shows an example with an inclined needle, Fig. 3 shows an example with a different lever configuration, Fig. 4 shows an example with a protective sleeve, and Fig. 5 shows an example with a rubber stopper of a cartridge capsule. 6 is a partial longitudinal cross-sectional view of a dental syringe according to a second embodiment of the invention; FIG. 7 is a modification of the actual IM embodiment shown in FIG. 6 with an inclined injection tube; FIG. There is an explanatory diagram showing an example. 1... Injection device, 2... Main body, 3, 3'... Operation lever, 4... Cartridge capsule holder, 5...
Cartridge power barrel, 6... mouthpiece, 7... injection side, 8... rubber stopper, 11... insertion means, 12...
Piston, 13... Guide groove, 14... Pin, 15
... Rack, 19... Pawl, 20... Shaft, 21.
... Spring, 23.23' ... Lever, 24 ... Shaft, 25 ... End, 2G ... Button, 27 ... Spring,
28... Cap, 29... Tongue piece, 31... Contact surface, 32... Surface, 33... Cylindrical member, 35... Front part, 36... Sleeve, 37... ...Protrusion, 40...Container holter, 41...Container, 43.43'...Injection tube, 45...Bung, 46...Auxiliary piston, 48...
- Compression spring, 49...Ring, 52...Shoulder, 53...Opening. Procedures Amendment C Method) L Indication of nature 1982 Patent Application No. 164925 2 Name of the invention Dental syringe 3 Person making the amendment Patent applicant France 25000-Besançon Ludou Tournel 5-12 Micro-Mega Société Anonyme 4, Agent Yahagi 2nd Building 5, 3-5-3 Uchikanda, Chiyoda-ku, Tokyo Date of amendment order Drawing 7 Contents of amendment Submission of appropriate drawings 8 List of attached documents

Claims (1)

[Claims] 1) A syringe, a container containing an object to be injected,
For dental syringes of the type including a piston for displacing the bottom of the container-C1, the movement of the piston into the container is effected by an operating lever containing a pawl cooperating with a rack disposed on the piston, when the user manually presses the operating lever. A dental syringe characterized in that the applied pressure is increased. 2) The dental syringe according to claim 1, wherein the cylindrical piston includes a longitudinal guide Iz groove, and a pin fixed to the syringe body fits into the guide groove. 3) The pawl is attached so as to be pivotable around a shaft fixed to the operating lever, and the spring pushes the G front self-pawl on one side and the inside of the operating lever on the other to hold the lever in a position away from the syringe body. A dental syringe according to claim 1 or 2. 4) Another lever is attached to be pivotable about a shaft fixed to the syringe body, one end of the other lever engages with the rack, the other end is a button, and one branch of the other lever is attached to one end of the other lever. 4. The dental syringe according to claim 1, wherein the other branch of the spring that engages the rack presses the inner surface of the operating lever. 5) When one end of the other lever leaves the rack,
5. The dental syringe of claim 4, wherein the one end separates the pawl of the operating lever from the rack. 6) The dental device according to any one of claims 1 to 3, which includes a tongue-like piece fixed to the syringe body and having flexibility to push the back of the C lever and the back of another lever. Syringe. 7) By pulling up the operating lever above its equilibrium position, the contact surface of the operating lever pushes the surface of another lever and prevents the other lever from separating from the rack. Syringe. 8) The dental syringe according to any one of claims 1 to 7, wherein the injection needle is attached to a fixed mouthpiece. 9) Attach the injection needle to the replaceable cap connected to the holder of the container using the insertion means (=the dental syringe according to any one of claims 1 to 7). 10) Injection I!l according to any one of claims 1 to 9, wherein the needle is inclined with respect to the longitudinal axis of the syringe.
A medical sword tool. 11) A dental syringe according to claim 10, wherein the rear part of the needle is substantially parallel to the longitudinal axis of the syringe. 12) The dental syringe according to claim 10 or 11, wherein the container holder includes a cylindrical member having a conical hole. 13) The dental syringe according to any one of claims 1 to 12, wherein the injection material is a liquid, and a cartridge capsule containing the liquid is introduced into the container holder from the rear end of the container holder. . 14) Claim 1 comprising a sleeve extending between the front end of the holder and the cartridge capsule and protecting the rubber stopper from bursting due to the pressure of the liquid in the cartridge capsule.
The dental syringe described in item 3. 15) The sleeve expands in a morning glory shape at the rear end to match the shape of the holder and surrounds the rear part of the injection needle, and the rear end has a protrusion in the center that gently pushes back the rubber stopper at the same level as the rear end of the injection needle. A dental syringe according to claim 14. 16) The material to be extruded is a paste, and it is placed in a cylindrical container whose front part is an injection tube and whose rear part is closed with a flexible stopper that is pressed into the container. Claims 1 to 12 are characterized in that an auxiliary screw is slidably attached to the rear of the container in the container holder to withstand the action of the main screw of the syringe. dental syringe. 11) A dental syringe according to claim 16, in which the auxiliary piston is pressed rearward by a ring cooperating with the container holder and a compression spring pressing the shoulder of the piston. 18) The dental syringe according to claim 16 or 17, wherein the front part of the container holder is provided with an opening for inserting the container. 19) The dental syringe according to any one of claims 16 to 18, wherein the injection tube is arranged obliquely with respect to the axis of the syringe.