JPH032259Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a syringe (impression material injector) that is used to inject impression material into the affected area when taking an impression to make a mold of a denture to be loaded in dental treatment. Regarding the improvement of

As shown in FIG. 1, the impression material injector A usually consists of a cylinder a into which a cartridge 1 made by filling a glass tube 10 with an impression material (agar), and a cylinder a. A piston c is held in a piston holding cylinder b and attached to the cylinder a so as to be pushed into the glass tube 10 of the cartridge 1 loaded in the cylinder a.
and an injection tube d attached to the distal end side of the cylinder a.

When injecting the impression material into the affected area, the cartridge 1 is heated to melt the impression material in the glass tube 10, and the cartridge 1 is bent with the piston holding cylinder b to the side as shown in FIG. The cylinder 1 is rotated to open the proximal opening, and the cylinder is loaded from the open opening, and then
The piston holding cylinder b, which is connected to the base end side of the cylinder a so as to be able to bend and rotate freely by a hinge, is brought into a state in which the axial direction coincides with that of the cylinder a, as shown in FIG. Put your fingers on the finger rest e provided on the cylinder b and the finger rest f provided on the outer end of the piston c, and push the piston c slightly, thereby pushing the cartridge 1 into the tip side of the cylinder a. , a needle d' continuous to the proximal end of the injection tube d attached to the distal end of the cylinder a is inserted into the rubber membrane sealing the distal end of the glass tube 10, and the cartridge 1 is
The injection tube d is brought into communication with the inner cavity of the syringe A, and the syringe A is operated in this state to inject a desired amount of impression material into a predetermined location where an impression is to be taken.

By the way, when loading the cartridge 1 into the syringe A, which has been heated so that the impression material therein is melted, the piston holding cylinder b is rotated to a position bent laterally with respect to the cylinder a. The loading operation is troublesome because it requires operation and rotation to return it to a straight position with respect to the cylinder a. In addition, when removing the empty cartridge 1 after injection of the prescribed impression material or the cartridge 1 in which the impression material still remains from the cylinder a, the injection tube d is attached to the rubber membrane at the tip of the cartridge 1. needle on the proximal side of
Cartridge 1
However, there are cases where it does not come out easily from the opening on the rear end side of cylinder a, making it troublesome to take out the cartridge 1. Furthermore, the cylinder a has a window g formed in its cylindrical wall for visually confirming the remaining amount of impression material in the loaded cartridge 1, and corresponds to the cartridge 1 with a width that prevents the cartridge 1 from escaping. Because the long slit is open, the piston C can be strongly pressed without knowing that the impression material in the cartridge 1 has solidified.
If the glass tube 10 of the cartridge 1 is pushed in, the glass tube 10 of the cartridge 1 may burst, and at that time, glass fragments will fly out from the slit-shaped window g made in the wall of the cylinder a and enter the patient's mouth. There are problems such as damaging the

The present invention was devised to solve these problems that have arisen with conventional syringes. An object of the present invention is to provide a new means that can effectively prevent fragments of the ruptured glass tube 10 from flying out even if the glass tube 10 ruptures due to the pushing pressure of the piston c.

In the present invention, as a means to achieve this purpose, an injection tube is provided on the tip side,
A cartridge insertion opening for loading and unloading a cartridge filled with impression material is formed in the shape of a long split along the axial direction on one side of the cylindrical wall of the cylinder in which a piston is held on the rear end side so that it can be pushed and pulled freely. At the same time, a cartridge extrusion hole is formed in the shape of a small window hole on the side opposite to the cartridge insertion opening, at a portion closer to the rear end side, and on the outer periphery of the cylindrical wall of the cylinder,
A cover cylinder having a cleavage that overlaps with the cartridge insertion opening is rotatably fitted, and on the opposite side of the cylindrical wall of the cover cylinder from the cleavage, the cleavage overlaps with the cartridge insertion opening. This invention proposes a syringe for injecting an impression material, which has a window hole that overlaps with the cartridge extrusion hole in a region corresponding to the cartridge extrusion hole.

Next, embodiments will be described in detail with reference to the drawings. Note that the same reference numerals in the drawings as those in the conventional means are used for constituent members having the same effect.

FIG. 4 is a plan view of a syringe A in which the present invention can be implemented, with the cartridge insertion port open;
FIG. 5 is a side view of the same state as above, and in the same figure, a
is a cylinder, d is an injection tube attached to the tip side of cylinder a (left side in the figure), c is a piston,
h indicates a cover tube fitted around the outer periphery of cylinder a.

As shown in FIGS. 6 and 7, the cylinder a includes a cylindrical main body 2 made of metal, a tip 3 screwed into the front end of the main body 2, and a rear end of the main body 2. It consists of a rear end portion 4 that is screwed onto the end side.

As shown in FIGS. 8 and 9, the cylindrical main body 2 has a width D wider than the outer diameter of the cartridge 1 filled with the impression material on one side of the cylindrical wall 2a. A cartridge insertion port 20 that is continuous in the axial direction and has a length L longer than that of the cartridge 1 is provided, and a cartridge insertion port 20 that is continuous in the axial direction is provided on the side surface of the cylinder wall 2a opposite to the cartridge insertion port 20. A cartridge extrusion hole 21 is formed in the shape of a small window hole at the portion. Furthermore, screw grooves 22 and 23 are provided on the outer peripheral surfaces of the front end side and the rear end side of the main body portion 2, respectively.

The tip part 3 is formed of a metal material into the shape of a funnel with a diameter somewhat larger than that of the main body part 2, and the inner periphery of the rear end side (the right end side in FIG. 6) that expands in diameter and opens. The surface is provided with a female screw that is engaged with the thread groove 22 on the front end side of the main body part 2, and is thereby screwed into the front end side of the main body part 2, and by this screwing, the front end part 3 A step portion 3a is formed between the rear end surface 30 and the outer circumferential surface of the main body portion 2, and corresponds to the inner thickness of the cover tube h fitted to the outer circumference of the main body portion 2. Further, a threaded tube portion 31 is installed on the narrow constricted tip side of the tip portion 3, into which a connecting screw portion 50 installed on the outer periphery of the portion near the proximal end of the injection tube d is screwed. By fitting them together, the injection tube d is installed with its needle portion d' projecting into the cylinder a.

Further, as shown in FIG. 12, the rear end portion 4 is formed into a cap shape that is screwed onto the outer periphery of the rear end side of the main body portion 2, and the inner periphery of the rear end portion 4 on the front end side. It is integrally assembled to the main body part 2 by screwing the female thread 40 provided on the surface with the screw groove 23 on the rear end side of the main body part 2. The rear end portion 4 is provided with a sheath tube that encloses the outer periphery of the rear end side of the main body portion 2 and the rear end side of the cover tube h fitted to the outer periphery of the main body portion 2, on the front end side of the female thread 40. 41 is formed, and a guide cylinder 42 that guides the reciprocating operation of the piston c is fitted in the inner cavity so as to be able to freely slide in the axial direction.
It is urged by a spring 43 to be pushed toward the front end side. Further, a lid 45 having a through hole 44 in the center portion is screwed onto the rear end of the rear end portion 4, and the piston c passes through the through hole 4 of this lid 45 to the rear. It stands out.

As shown in FIGS. 10 and 11, the cover cylinder h has a semi-cylindrical shape in which a cleavage 61 is formed in the cylinder wall 60 along the axial direction, and the inner diameter of the cover cylinder h is the same as that of the main body of the cylinder a. It is formed into a cylindrical body whose length corresponds to the outer diameter of 2 and whose length is somewhat shorter than that of the main body 2, and
The width of the cleavage 61 is formed to be approximately equal to the width D of the cartridge insertion opening 20 provided in the main body portion 2. The cover cylinder h is connected to the cylinder a mentioned above.
When assembling by screwing the front end part 3 and the rear end part 4 onto the main body part 2, before screwing the rear end part 4 into the main body part 2, attach the rear end to the outer periphery of the main body part 2. Insert the cover tube h from the side, and in that state, insert the rear end portion 4.
By assembling it to the main body part 2 by screwing, the front end side abuts the rear end surface 30 of the tip part 3, as shown in FIG. It is designed to freely rotate around the outer periphery of the main body part 2 in a state where it is wrapped inside and prevented from escaping from the main body part 2. and,
The rotation with respect to the main body 2 is achieved by a notch 63 formed on the front edge of the cover tube h removably fitting into a protrusion (not shown in the drawing) provided on the step 3a. , a cleavage 6 provided in the cover tube h
1 and the cartridge insertion slot 20 provided in the main body part 2 coincide with each other, as shown in FIGS.
In the state in which the cartridge insertion opening 20 is covered, the cover tube h is lightly locked against the main body portion 2 so as not to move in the circumferential direction. Further, the cover tube h is provided with a cartridge extrusion hole 21 in a position overlapping with a cartridge extrusion hole 21 provided in the main body part 2 in the state position shown in FIG. 5 with the cartridge insertion opening 20 of the main body part 2 open. A window hole 62 that overlaps the hole 21 is provided.

e is a finger rest on which the piston c is pushed in, and as shown in FIGS. 15 and 16, it is formed into a blade shape with a through hole 70 in the center, and It is integrally assembled to the rear end portion 4 by fitting the through hole 70 in the center into the outer periphery of the rear end portion 4 and screwing the lid 45 onto the rear end of the rear end portion 4. .

f is a finger rest screwed onto the rear end of the piston c.

Note that 80 is a contact between the rear end surface of the cover tube h and the rear end portion 4 in the above-mentioned sheath tube 40 so as to push the cover tube h fitted onto the outer periphery of the main body portion 2 of the cylinder a toward the front. This is a spring installed in between.

The embodiment device constructed in this manner operates as follows.

When loading the cartridge 1 into the cylinder a of the syringe A, the cover tube h fitted around the outer periphery of the main body part 2 of the cylinder a is rotated relative to the main body part 2, and as shown in FIGS. The cartridge 1 is then inserted into the cartridge insertion slot 20 which is opened.

After completing this operation, push the piston c lightly and insert the tip of the piston c into the glass tube 1 of the cartridge 1, as shown in FIG.
Rubber piston 1 inserted as a seal in 0
By pressing 1, the state shown in FIG. 18 is created in which the needle d' at the rear end of the injection tube d has entered the rubber film at the tip of the cartridge 1.

Cartridge insertion slot 2 that is open in this state
0, the cover tube h is attached to the main body part 2.
Rotate 180 degrees in the circumferential direction. As a result, the cartridge insertion opening 20 is covered with the cover tube h, and the loading operation of the cartridge 1 is completed.

If you push the piston c strongly from this state, the tip of the piston c will push the rubber piston 11 inside the glass tube 10 of the cartridge 1, and the impression material inside the cartridge 1 will be pushed into the injection tube d.
It is extruded from the tip of the

At this time, if excessive pressure is applied inside the glass tube 10 of the cartridge 1 due to solidification of the impression material or clogging of the injection tube d, and the glass tube 10 ruptures, the resulting scattering of broken glass pieces can be prevented. The cover tube h confines the glass pieces inside the cylinder a to prevent glass fragments from flying out.

In addition, in a state where the cover tube h covers the cartridge insertion port 20 of the cylinder a, the cylinder a
is opened to the outside through a cartridge extrusion hole 21, which is provided in a portion close to the rear end of the main body 2, and a window hole 62, which is provided in a portion close to the rear end of the cover tube h. In relation to the cartridge 1, the glass tube 1 has almost no pressure applied to it.
Since it is located at a position corresponding to the rear end side of 0, no glass fragments will fly out from here.

Next, when taking out the cartridge 1 from the syringe A, rotate the cover tube h to the state shown in FIGS. If the rear end side of the cartridge 1 is pressed against the cartridge 1, the rear end side will come up from the cartridge insertion opening 20, so that it can be easily pulled out by grasping and pulling it out.

As explained above, the impression material injector according to the present invention is equipped with an injection tube d on the distal end side, and an impression material syringe on one side of the cylindrical wall 2a of the cylinder a, in which the piston c is held on the rear end side so as to be freely pushed and pulled. Cartridge insertion port 20 for loading and unloading the cartridge 1 filled with material
is formed into a long cleavage shape along the axial direction, and a cartridge extrusion hole 2 is formed in a portion of the side opposite to the cartridge insertion opening 20 and closer to the rear end side.
1 is formed in the shape of a small window hole, and a cover tube h having a cleavage 61 that overlaps with the cartridge insertion port 20 is rotatably fitted on the outer periphery of the cylinder wall 2a of the cylinder a. On the side opposite to the cleavage 61 of the cylindrical wall, a window hole 62 is formed at a portion corresponding to the cartridge ejection hole 21 and overlaps with the cartridge ejection hole 21 when the cleavage 61 wraps with the cartridge insertion opening 20. Therefore, loading and unloading of the cartridge 1 into the cylinder a of the cylinder A can be easily performed, and even if the loaded cartridge 1 ruptures due to the pushing pressure of the piston c, the ruptured glass tube 10 will not be damaged. This makes it possible to effectively prevent debris from flying out.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional means, Figure 1 is a side view of a conventional syringe, Figure 2 is a side view when the same cartridge as above is loaded, and Figure 3 is a side view of the same cartridge as above loaded. FIG. 3 is a partially cutaway side view of the state. 4 to 18 show examples of the means of the present invention, in which FIG. 4 is a plan view of a syringe according to the present invention, FIG. 5 is a side view of the same, and FIG. 6 is a plan view of the same cylinder, and FIG. Figure 7 is the front view of the same as above, Figure 8
The figures are a plan view of the main body of the cylinder, FIG. 9 is a vertical sectional front view of the main body, FIG. 10 is a plan view of the cover cylinder, and FIG. Figure 12 is a cross-sectional plan view of the same syringe, the first
3 is a plan view of the same piston as above, FIG. 14 is a rear view of the above piston, FIG. 15 is a rear view of the same finger rest, FIG. 16 is a plan view of the same finger rest, and FIG.
The figure and FIG. 18 are explanatory diagrams of the action of the syringe mentioned above. Explanation of drawing symbols, A...Syringe (impression material injector), D...Width, L...Length, a...Cylinder,
b... Piston holding cylinder, c... Piston, d...
Injection tube, d'...needle part, e, f...finger hook, g...
Window hole, h... Cover tube, 1... Cartridge, 10
...Glass tube, 11...Rubber piston,
2...Main part, 2a...Cylinder wall, 20...Cartridge insertion port, 21...Cartridge extrusion hole, 2
2, 23...Thread groove, 3...Tip part, 3a...Step part, 30...Rear end surface, 31...Thread cylinder part, 4...
Rear end, 40...Female thread, 41...Sheath tube, 42...
...Guide tube, 43...Spring, 44...Through hole, 45
... Lid, 50 ... Connection screw part, 60 ... Cylinder wall, 6
1... Cleavage, 62... Window hole, 63... Notch, 7
0...Through hole, 80...Spring.

Claims (1)

[Scope of utility model registration request] Cartridge insertion for loading and unloading the cartridge 1 filled with impression material into one side of the cylindrical wall 2a of the cylinder a, which is equipped with an injection tube d on the front end side and a piston c is held on the rear end side so as to be freely pushed and pulled. mouth 20,
It is formed into a long cleavage shape along the axial direction, and a cartridge extrusion hole 21 is formed in the shape of a small window hole on the side opposite to the cartridge insertion opening 20 and closer to the rear end. A cover tube h having a cleavage 61 that overlaps with the cartridge insertion opening 20 is rotatably fitted on the outer periphery of the cylindrical wall 2a, and the cleavage is provided on the opposite side of the cylindrical wall of the cover tube h to the cleavage 61. 61 is the cartridge insertion slot 2
0. A syringe for injecting an impression material, which has a window hole 62 formed in a region corresponding to the cartridge extrusion hole 21 and overlapping with the cartridge extrusion hole 21 in a state where the syringe overlaps with the cartridge extrusion hole 21.