JPH0153071B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to dental syringes, and more particularly to dental syringes of the type that include a needle, a container containing the substance to be injected, and a piston for displacing the bottom of the container. Regarding dental syringes.

A syringe of this type has already been described, for example, in French Patent No. 1583163 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 space between the bone and the tooth is so narrow that very sharp and flexible needles must be inserted. In order to successfully force the substance to be injected through this needle, a very high injection pressure must therefore be applied.

Simply applying pressure to the piston with the palm of your hand, as with a regular syringe, is not adequate.

The present invention therefore aims to provide a syringe for intraligamentous injections which overcomes these disadvantages.

The present invention includes a syringe needle for injecting a liquid or an injection tube for injecting a paste-like substance, a hole for inserting the syringe needle or injection tube at one end, and an insertion means at the other end. A substantially hollow cylindrical holder having an open end into which a container containing a substance to be injected is loaded, and an open end that fits into an insertion means at the other end of the holder and is movable in the axial direction. A dental syringe comprising a hollow cylindrical main body having a cylindrical piston fitted therein, an opening extending in the axial direction is provided on the outer periphery of the main body, and an opening provided in the outer periphery of the main body on the outer periphery of the piston is provided with an opening extending in the axial direction. A rack having a plurality of teeth is provided at an opposing position along the axis of the piston, the rack having a plurality of teeth consisting of an inclined surface facing downward toward the injection needle or injection tube and an upright surface substantially perpendicular to the axis of the inclined surface; A semi-shaft extending in a direction perpendicular to the axis and parallel to the opening is fixed on the outer periphery of the main body and on the side away from the opening with reference to the axis, and the semi-shaft extends toward the injection needle or injection tube side. An operating lever that extends away from the axis of the main body as it moves is pivoted toward the main body until it becomes approximately horizontal and can be moved toward and away from the rack, A shaft parallel to the semi-shaft is provided at a position further away from the injection needle or injection tube, and a lever that extends toward the injection needle or injection tube and has a tip that engages with the rack is rotatably supported on the shaft. , a flexible body for pressing the lever into the easy position is disposed between the operating lever and the lever or between the operating lever and the main body, and the operating lever is provided with a shaft located closer to the injection needle or injection tube than the half shaft. is provided parallel to the semi-shaft, and a pawl is attached to the shaft to extend toward the injection needle or injection tube through an opening in the outer periphery of the main body and has a tip that engages with the rack, making the dental syringe. .

As the pressure applied by the user's hand is increased, the substance to be injected is effortlessly forced out of the container.

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

According to a first embodiment of the invention, the substance to be injected is a liquid and is contained in a cartridge capsule as described in the above-mentioned prior art, i.e. in the form of a small rectangular tank. ,
The rear end of the cartridge capsule consists of a movable disk, and the front end is filled with a rubber stopper that can be pierced with a needle.

In this embodiment, the invention further provides a structure between the front end of the cartridge capsule holder and the cartridge capsule to prevent accidental rupture due to deformation of the stopper under the pressure of the liquid contained in the cartridge capsule. A sleeve is provided to protect the cap of the cartridge capsule. According to the invention,
The sleeve widens at the rear end to fit the shape of the cartridge capsule holder and surrounds the rear of the needle, and the center of the rear end has a protrusion that gently presses back against the rubber stopper of the cartridge capsule at the same level as the end of the needle. have

According to a second embodiment, the substance to be injected is in the form of a paste, and in this case, instead of the above-mentioned cartridge capsule, there is an injection tube, the front of which is optionally curved in the form of an elbow. To provide a paste container whose rear part is a flexible stopper that can withstand the action of an auxiliary piston moving in a container holder and that can withstand the action of a main piston in a syringe body. An adjustment spring moves this auxiliary piston away from the stopper, and the path of this auxiliary piston is directed by a two-way line arranged in the container holder.
delimited by individual receptacles.

In the first embodiment, the cartridge capsule is inserted from the rear of the holder, but in this second embodiment, because of the 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 an opening formed in the.

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

1-3, let us first look at a first embodiment of the invention in which the syringe is for intraligamentous injection of liquid.

In this case, a syringe 1 as shown in its entirety in FIG.
It includes a cartridge capsule holder 4 through which an injection needle 7 is passed, and a cap 6 containing an injection needle 7. The cartridge capsule 5 takes the form of a rectangular tank containing the liquid to be injected, as is known. It includes at one end a rubber plug 8 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 disc which is movable and, when moving, forces the liquid to be injected towards the injection needle 7.

The cartridge capsule holder 44 has an opening 1 for monitoring the filling level of the cartridge capsule 5.
Contains 0.

The cartridge capsule holder 4 is removably connected to the main body 2 so that the cartridge capsule 5 can be installed or removed using, for example, an insertion means 11 which is of a conventional structure and will not be described in detail.

A cylindrical piston 12 slides within the body 2 and includes a longitudinal guide groove 13 that cooperates with a pin 14 fixed to the body 2. Therefore, piston 12 cannot rotate about its longitudinal axis.

On the cross-section of the piston 12 parallel to the generatrix, a rack 15 is formed whose teeth are directed towards 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 has two semi-shafts 16 aligned and fixed to both sides of the main body 2. Install it so that it can pivot around the center. The lever 3 is thus connected to the side 17 of the articulation.
The main body 2 is wrapped by.

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.

On the lever 3, a shaft 20 fixed to the lever 3
A pawl 19 that pivots around is attached.

The spring 21 pushes 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 connected to the shaft 2 fixed inside the main body 2.
4 Install so that it can rotate around the center. One end 25 of the lever 23 engages the rack 15, and the other end includes a button 26 projecting outside the body 2 and to which the user applies manual pressure. The spring 27 presses with one branch the end 25 of the lever 23 engaged with the rack 15;
Press the inner surface of lever 3 with the other branch.

When the button 26 is pressed, the end 25 of the lever 23 moves away from the rack 15 and moves the pawl 19, causing the rack 1
Release claw 19 from 5.

This syringe operates as follows. First, the piston 12 is placed in the position shown in FIG. To do this, hold the syringe vertically, with the needle facing up.
Press button 26. The piston 12 is settled at the bottom of the main body 2 only by the weight of the pawl 19 and the end 25 of the lever 23.

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

For this purpose, when lever 3 is pressed, operating lever 3
rotates toward the rack 15 about the half shaft 16 on the main body 2, and at the same time the shaft 20 on the operating lever 3 moves on an arc centered on the half shaft 16, changing its relative position with respect to the rack 15. That is, the shaft 20 is rack 1
5, it moves in a direction toward the injection needle 7. For this reason, the pawl 19 is rotatable about the shaft 20.
moves in the direction of the injection needle 7 together with the shaft 20 while being pushed by the spring 21 and meshing with the rack 15.
is advanced by one step of the rack 15 in the direction of the injection needle 7. Further, the tip 25 of the lever 23 is pushed by the spring 27 and meshes with the teeth of the rack 15, but when the piston 12 is advanced one step by the pawl 19, the inclined surface of the teeth of the rack 15 engages with the tip 25 of the lever 23. The tip 25 of the lever 23 is rotated upward about the shaft 24 while sliding against the rack 15.
When the lever 23 advances one step, the tip 25 of the lever 23 is moved by the spring 2.
7, the upright surface of the teeth of the rack 15 again engages with the rear rack 15 to prevent the piston 12 from moving back. Next, when the operating lever 3 is released, the operating lever 3 returns to the position having a predetermined angle from the main body 2 by the action of the spring 21. Thereafter, by repeatedly pressing the lever 3 with your thumb, the same operation will be repeated.
The piston 12 advances the rack 15 step by step toward the injection needle. And therefore, this time piston 1
2 presses 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 disk and thus to the contents of the cartridge capsule 5 with a multiplication factor of, for example, approximately 5 times.

In the embodiment of FIG.
Attach to. 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 base 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, connect as shown below. That is, the needle is placed in the cartridge capsule holder, the cartridge capsule is introduced into the cartridge capsule holder, the cartridge capsule holder is hooked onto the syringe body, and the injection is performed.

In this case, the rear part of the needle should be the cartridge capsule 5.
A cylindrical member 33 having a conical hole may be provided in the cartridge capsule holder 4 to sufficiently penetrate the cartridge capsule holder 4. The needle 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.
A flexible tongue 29 fixed at 0 presses the back of lever 23', which has the same function as lever 23, and the back of lever 3', which has the same function as lever 3, and presses them and the pawl 19'. to keep it in place.

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

To release the pawl 19' and the lever 23' from the rack 5 of the piston 12, the lever 3' can be pulled up above its equilibrium position determined by the rest position of the tongue 29. Then, the contact surface 31 of the lever 3'
presses the surface 32 of the lever 23', causing the lever 23' to rotate while being released from the rack 15.

Next, FIGS. 4 and 5 show a modification in which the cartridge capsule is provided with a protective sleeve, and the front part 35 of the cartridge capsule holder 4 is shown in FIG.
A sleeve 36 is provided to surround the injection needle 7 from the bottom of the mouthpiece 6 to the rubber stopper 8 of the cartridge capsule 5. As shown in the figure, the sleeve 36 widens in a morning glory shape at the rear, and has a protrusion 37 around the needle 7 that pushes back the rubber stopper 8, and comes into contact with the front surface of the cartridge capsule holder 4.

The primary purpose of this protrusion 37 is to prevent the rubber stopper 8 from bulging out under the pressure of the liquid.
If the rubber stopper 8 bulges out, there is a risk that the rubber stopper 8 will tear, especially when inserted with an elbow-shaped needle 7 (FIG. 2).

In addition, when the pressure of the liquid contained in the cartridge capsule 5 increases, the rubber stopper 8 closes at the moment of use.
The resultant force of the pressure acting on the needle is decomposed into a force F ₁ acting diagonally and a force F ₂ acting toward the needle, as shown in Figure 5.
In other words, the rubber stopper 8 presses the needle 7 very strongly at the moment of use, thereby making it possible to avoid leakage.

Reference is now made to Figures 6 and 7, which illustrate a second embodiment of the invention, in which the material to be injected is in the form of a paste.

Reference numeral 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 41 and an auxiliary piston 46 arranged therein. It forms a housing for

Container 41 contains a paste-like substance 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 holder 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 47 projects outside the container holder 40.
The main piston 12 when the container holder 40 is latched onto the syringe body 2 by the bayonet means 11
(not shown in FIGS. 6 and 7).
This auxiliary piston 46 is pressed rearward by a compression spring 48. That is, the compression spring 48 forces, at the front, a ring 49 which is restrained from forward axial movement by a shoulder 50 arranged in the container holder 40 and cooperating with a corresponding stop 51 of the container holder 40. , pushes the shoulder 52 of the auxiliary piston 46.
The auxiliary piston 46 is therefore in the position shown in the figure in the rest state.

Since it is impossible to introduce the container 41 into the container holder 40 from the rear due to the auxiliary piston 46, the stop 51 is inserted from the front end 44 of the container holder 40.
It is attached through an opening 53 formed in the vertical direction. To this end, the ring 49 has a beveled portion 54 that facilitates this insertion and serves to hold the container 41 in place.

The way the device works is the same as in FIGS. 1 and 2. The container holder 40 loaded with containers 41 is latched onto the body of the syringe by applying manual pressure so that the user can remove the main piston 1 for each pitch.
2, which transmits its movement to the auxiliary piston 46 against the compression spring 48. 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, thereby allowing the use of an injection tube 43' that is oblique to the axis of the device.

[Brief explanation of drawings]

FIG. 1 is a longitudinal partial sectional view of a dental syringe according to a first embodiment of the present invention, and FIGS. 2 to 4 are explanatory views showing modifications of the embodiment shown in FIG. Figure 2 shows an example with an inclined needle;
Fig. 3 shows an example in which the configuration of the lever is changed, Fig. 4 shows an example in which a protective sleeve is provided, Fig. 5 is an enlarged schematic diagram showing the shape of the rubber stopper of the cartridge capsule, and Fig. 6 is an example of the present invention. FIG. 7 is a partial longitudinal sectional view of a dental syringe according to a second embodiment of the present invention; FIG. 7 is an illustration of a modification of the embodiment shown in FIG. 1...Syringe, 2...Main body, 3, 3'...Operation lever, 4...Cartridge capsule holder, 5
... Cartridge capsule, 6... Base, 7...
Syringe needle, 8... Rubber stopper, 11... Insertion means, 1
2... Piston, 13... Guide groove, 14... Pin, 15... Rack, 19... Pawl, 20...
Shaft, 21... Spring, 23, 23'... Lever, 2
4...axis, 25...end, 26...button, 27...
...Spring, 28...Bag, 29...Language, 31...
...Abutting surface, 32... Surface, 33... Cylindrical member, 35
...Front part, 36...Sleeve, 37...Protrusion, 4
0... Container holder, 41... Container, 43, 43'
... Injection pipe, 45 ... Stopper, 46 ... Auxiliary piston, 48 ... Compression spring, 49 ... Ring, 52 ...
...Shoulder, 53...opening.

Claims (1)

[Claims] 1. Syringe needle 7 for injecting liquid or injection tubes 43, 43' for injecting paste-like material
and the injection needle 7 or injection tube 43, 4 at one end.
3' is inserted into the hole, and the insertion means 11 is inserted at the other end.
A substantially hollow cylindrical holder 4, 40 having an open end with a cylindrical shape and into which a container 5, 41 containing a substance to be injected is loaded, and an insertion means 11 at the other end of the holder 4, 40 is fitted A dental syringe comprising a hollow cylindrical body 2 having an open end and a cylindrical piston 12 fitted therein so as to be movable in the axial direction, an opening 18 extending in the axial direction on the outer circumference of the body 2. an opening 18 provided on the outer periphery of the piston 12 and opposite to the opening 18 provided on the outer periphery of the main body 2;
A rack 15 is provided along the axis of the piston 12 and has a plurality of teeth, which is a sloped surface facing downward toward the injection needle 7 or the injection tube 43, 43', and a vertical surface substantially perpendicular to the axis of the sloped surface. , the opening 18 on the outer periphery of the main body 2 and with the axis as a reference.
a half shaft 16 extending away from the axis in a direction perpendicular to the axis and parallel to said opening 18;
The operating levers 3, 3', which extend in a direction away from the axis of the main body 2 toward the injection needle 7 or the injection tubes 43, 43', are rotated toward the main body 2 side until they become approximately horizontal. The main body 2 is pivoted so that it can move and move toward and away from the rack 15.
A shaft 24 parallel to the half-shaft 16 is provided near the opening 18 on the outer periphery at a position farther from the injection needle 7 or the injection tube 43, 43' than the half-shaft 16, and the shaft 24
A lever 23, 23' extending toward the injection needle 7 or injection tube 43, 43' and having a tip 25 that engages with the rack 15 is rotatably supported, and the lever 23, 23' is attached to the rack 15. Flexible bodies 27 and 29 for pressing are arranged between the operating lever 3 and the lever 23 or between the operating lever 3' and the main body 2, and the injection needle 7 or the injection needle 7 or A shaft 20 located toward the injection tube 43, 43' side is provided parallel to the half shaft 16, and a shaft 20 is provided on the shaft 20 through the opening 18 on the outer periphery of the main body 2 and directed toward the injection needle 7 or the injection tube 43, 43' side. and extend the rack 1
5. A dental syringe characterized in that it is equipped with pawls 19, 19' having tips that engage with the syringe. 2. A guide groove 13 extending in the axial direction is provided on the outer peripheral surface of the piston 12 where the rack 15 is not provided, and a pin 14 that engages with the groove 13 is provided to protrude toward the inside of the main body 2. Dental syringe as described in section. 3. The pawl 19 is rotatably supported on the operating lever 3, and the pawl 19 and the operating lever 3 are pressed in a direction in which they are separated from each other to press the pawl 19 onto the rack 15 and perform the operation. a spring 21 for holding the lever 3 in a position apart from the main body 2;
A dental syringe according to claim 1 or 2, wherein the dental syringe is provided with: 4. The lever 23 provided inside the main body 2,
The lever 23 is rotatably supported on the main body 2, and the lever 23 is extended to the opposite side from the tip 25 to protrude from an opening 18 provided on the main body 2. While pressing the two in the direction of separating them, the tip 25 of the lever 23 is pressed.
A dental syringe according to any one of claims 1 to 3, further comprising a spring (27) for press-fitting the dental syringe (27) to the rack (15). 5. Connect the tip 25 of the lever 23 provided inside the main body 2 to the pawl 1 provided on the operating lever 3.
9 and the piston 1 of the pawl 19.
5. The dental syringe according to claim 4, wherein the dental syringe is disposed between the mating portion of the pawl 19 and the piston 12 and between the pawl 19 and the piston 12. 6. Around a portion where the lever 23' provided inside the main body 2 is pivotally supported on the main body 2, the lever 23' is placed at the same angle as the operating lever 3' with respect to the axis of the holder 4, and at the same angle as the operating lever 3'. A flexible piece formed of a square piece having an inclined surface that is colinear with the surface of the control lever 3', abutting both the square piece and the surface of the operating lever 3', and fixed to the main body 2 at the same time. A dental syringe according to any one of claims 1 to 3, which is provided with a letter-shaped tongue-like piece 29. 7. A shoulder 22 on the main body 2 connection side of the operating lever 3' that is closest to the part on the main body 2 facing the rack 15 is provided with a shoulder 22 that is capable of rotating the operating lever 3' in a direction to widen the angle with respect to the main body 2. A gap is provided between the shoulder 22 and the main body 2 in order to
and the square piece of the lever 23', and the center of rotation of the lever 23' is brought into contact with the shoulder 22.
7. The dental syringe according to claim 6, which is arranged within a radius of rotation of the dental syringe. 8. Claims 1 to 7, in which a mouthpiece 6 having a hole that communicates with a hole drilled at one end of the holder 4 to enable attachment and detachment of the injection needle 7 is externally fitted and fixed to the holder 4. A dental syringe according to any of the above. 9 the injection needle 7 bored into one end of the holder 4;
A cap 28 having a hole communicating with a hole for inserting the needle is removably provided in the holder 4, and the injection needle 7 is inserted and fixed into the hole provided in the cap 28. A dental syringe as described in any of the above. 10 The injection needle 7 provided at one end of the holder 4
10. The dental syringe according to claim 1, wherein the hole for inserting the piston is formed obliquely with respect to the axis of the piston 12. 11 The injection needle 7 provided at one end of the holder 4
10. The dental syringe according to claim 10, wherein the hole for inserting the substance to be injected is bent in the middle and the angle near the opening on the side of the container 5 containing the substance to be injected is made substantially parallel to the axis of the piston 12. . 12 Place a cylindrical member 33 having a funnel-shaped opening inside the portion of the holder 4 that contacts the container 5 containing the substance to be injected, with the small diameter opening side of the cylindrical member 33 facing the container 5. A dental syringe according to embedded claim 10 or 11. 13 An opening for attaching and detaching the container 5 containing the substance to be injected, which has a disk sealed at one end with a rubber stopper 8 and provided movably in the axial direction at the other end, is provided in the insert. A dental syringe according to any one of claims 1 to 12, comprising a holder (4) having an open end provided with means (11). 14 The injection needle 7 provided at one end of the holder 4
A hole for inserting the substance to be injected is embedded inside one end of the holder 4 with a flat end protruding into the holder 4 so as to come into contact with the rubber stopper 8 at the end of the container 5 containing the substance to be injected. 14. A dental syringe according to claim 13, which is formed by a substantially hollow cylindrical sleeve 36 inserted therein. 15 Insert the rubber stopper 8 at the end of the container 5 containing the substance to be injected into the container 5 around the opening of the hole into which the injection needle is inserted, which is made in the protrusion inside the holder 4 of the sleeve 36. The dental syringe according to claim 14, further comprising a protrusion 37 that can be pushed inward. 16 A cylinder having injection pipes 43, 43' at one end, an opening at the other end, a flexible plug 45 having a slightly larger diameter than the opening inserted into the opening, and a paste-like substance sealed inside. A cylindrical auxiliary piston 46 having a length such that one end has approximately the same diameter as the opening of the container 41 and is in contact with the container 41 and the other end is in contact with the piston 12 is attached to the plug 45 of the container 41. The container 41 and the auxiliary piston 4 are in contact with each other.
6 into the holder 40 and the injection tubes 43, 4
13. The dental syringe according to any one of claims 1 to 12, wherein the syringe 3' is inserted so as to protrude from the hole of the holder 40. 17 A stop 51 that protrudes inward is provided at the intermediate portion of the holder 40, and has a protrusion 50 that engages with the stop 51 and has a tip that holds the container 41 that encloses the paste-like contents. a ring 49 having a hole through which the auxiliary piston 46 passes;
is inserted into the holder 40 from the opening on the main body 2 side, and a shoulder 52 projecting like a brim is provided near the end of the auxiliary piston 46 on the main body 2 side, and a shoulder 52 is provided between the shoulder 52 and the protrusion 50 of the ring 49. 17. The dental syringe according to claim 16, further comprising a compression spring 48 that presses the auxiliary piston 46 and the ring 49 away from each other on the axis. 18 At an intermediate portion between the stop 51 on the outer periphery of the holder 40 and the hole into which the injection tubes 43 and 43' are inserted,
The dental syringe according to claim 16 or 17, further comprising an opening 53 into which the container 41 containing the paste-like contents is inserted. 19 Container 4 containing the paste-like contents
1, an injection tube 43' at one end of the container 41 is provided at an angle with respect to the axis of the container 41, and a hole in the holder 40 into which the injection tube 43' is inserted is formed at an angle corresponding to the injection tube 43'. A dental syringe according to any one of claims 16 to 18.