TWI507176B - Can be used with two kinds of dental anesthesia with the cartridge of the electric syringe - Google Patents

Description

Two types of electric syringes with cassettes for dental anesthesia

The present invention relates to a power injector that can be commonly applied to two kinds of cassettes containing 1.0 ml and 1.8 ml of anesthetic solution.

The cassette used in such a power injector is made of transparent glass and is filled with a dental local anesthetic injection. In this type of cassette, the volume of the injection solution is 1.8 ml and 1.0 ml. Since the inner diameter and the outer shape of the cassette are the same, the length will be different. Two types of cassettes are used during anesthesia. For electric syringes, the cassette is usually loaded into the cassette holder, and the cassette holder is attached to the connection of the power injector, and then the two ends are injected. The needle is attached to the front end of the cassette holder to communicate with the inside of the cassette for use.

The electric syringe includes an actuating rod for pressing the plunger rubber plug of the cassette and an actuating means for moving the push rod forward in order to pass the anesthetic liquid from the cassette through the injection needle. The actuating device generally includes a pinion that rotates by power transmission of a driving unit including a motor and a speed reducer, and a pusher that is engaged with the pinion gear to linearly move the push rod. A rack formed by a pressure bar. In order to allow the anesthetic liquid to be loaded from the cassette of the cassette holder to be ejected through the injection needle, the linear movement of the push rod requires a distance corresponding to the length of the anesthetic liquid accommodated in the cassette. The linear movement distance of the push rod is such that the micro switch is turned off (0ff) by a specific portion of the push rod, thereby stopping the rotation of the motor to be limited. After the injection solution is discharged, the cartridge holder is detached from the coupling joint to dissipate the power of the drive unit, and the pinion gear is idling, and the push rod is pushed back to the syringe body by the same distance. In this process, the micro switch is in an open state on the outside of the push rod.

At present, the card-type electric syringe that the applicant sells in dental treatment has a length of 1.0 ml and 1.8 m of the anesthetic solution, so that the anesthetic liquid is discharged to push the plunger rubber plug of the cassette. Since the pushing distance is different, the cassette holder and the pressing rod mounted on the electric injector are separately used separately. With the spread of electric syringes, there is a desire in the dental industry for electric syringes that can be used in common in 1.0 ml and 1.8 ml anesthetic fluid cartridges. If you think about this problem with the composition of the electric syringes so far, of course, you should also make the cassette holders share the cassettes containing 1.0ml and 1.8ml anesthetic fluid, but for the 1.0ml and 1.8ml cassettes. If the forward end position of the common push rod is established, it is necessary for the 1.8 ml cassette to retract the starting position of the push rod into a distance corresponding to the difference in the length of the cassette. In this case, the push rod of the electric injector must have a sufficient length when pushing the plunger rubber plug of the 1.8 ml cassette, so the push rod must extend rearward to the length of the cassette. The difference in the amount of distance, so the motor injector body must be able to protrude rearward. The invention developed based on such considerations is disclosed in Patent Document 1. Patent Document 1 also discloses a plunger rubber plug that blocks a pressing bar against a clicker at a constant pressure regardless of the setting position of the clicker. However, the configuration of the invention disclosed in Patent Document 1 is not necessarily an ideal invention for the purpose of a compact electric syringe.

[Patent Document 1] Japanese Patent No. 4198435.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cartridge holder which can be used in combination with a cartridge of 1.0 ml and 1.8 ml of anesthetic solution, and which is necessary for a plunger rubber stopper that pushes a 1.0 ml cartridge. The length of the push rod can also be used to push the 1.8ml cartridge plunger rubber plug and use two kinds of electric syringes equipped with dental anesthesia cartridges.

SUMMARY OF THE INVENTION The above object of the present invention is achieved by providing a power injector which can be used in combination with two types of cartridges for dental anesthesia fluid, which is a cartridge holder which has been filled with an anesthetic fluid cartridge by means of a joint. Installed on the body of the electric injector, the pinion gear rotated by the driving unit is engaged with the rack of the pushing rod, so that the pushing rod slowly moves and pushes against the plunger rubber plug with the anesthetic liquid cartridge The dental anesthetic liquid composed of the anesthetic liquid in the cassette is discharged from the cassette through the injection needle, and the cassette type electric syringe is filled, and the cassette holder can be used for 1.0 ml cassette and 1.8. The cartridge retainer of the ml cartridge; the push rod is such that the movement of the push rod can be terminated at the end position common to the 1.0 ml cassette and the 1.8 ml cassette which are filled to the cassette holder The way has: 1.0ml card setting position and The position is retracted into the 1.8 ml cassette setting position; and includes a bottomed sleeve and a coil return spring for receiving the rear end portion of the push rod that is pressed back from the common end position And when the push rod is located at the set position of the 1.0 ml cassette, it is not interfered by the rear end surface of the push rod, and when the push rod is pressed back to the 1.8 ml cassette setting position, the push rod is pushed back. The end face pushes the sleeve toward the rear; the coil return spring is for moving the sleeve forward together with the push bar when the push bar moves forward.

Further, in the electric syringe according to the present invention, the coil return spring is disposed around the bottomed sleeve, and one end thereof abuts against a peripheral flange formed at a front end of the sleeve, and the other end thereof is Abutting: a shoulder of the inner hole provided at the rear end of the electric injector body, and in a normal state, the sleeve is elastically pressed against a part of the driving unit, and in this state, the sleeve is located at: Close to the position of the end face after the push bar.

Further, in the electric syringe according to the present invention, it is preferable that the sleeve has a size slightly longer than the length difference between the 1.0 ml anesthetic solution and the 1.8 ml anesthetic solution.

Further, in the electric syringe according to the present invention, when the sleeve is pressed rearward by the end surface after the pressing rod, the sleeve protrudes through the inner hole provided at the rear end of the motor injector body.

According to the present invention, the cartridge of the 1.0 ml anesthetic solution or the stopper of 1.8 ml is loaded into the cassette holder, and the cassette holder is coupled to the electric syringe by the joint. By the pinion gear rotated by the driving unit and the rack of the pressing rod, the pushing rod is slowly moved to push the plunger rubber plug with the anesthetic liquid cartridge to make the card The anesthetic solution is discharged from the cassette through the injection needle, wherein the movement of the push rod is set to be at the position common to the 1.0 ml cassette and the 1.8 ml cassette, so the position of the 1.8 ml cassette is set. The amount of difference in the length of the cassette is retracted from the position of the card set of 1.0 ml. When the push rod is pressed back from the common end position, the bottom sleeve receives the rear end portion of the push rod. When the push rod reaches the set position of the 1.0 ml cassette, it will not be pressed by the rear end surface of the push rod and stay there, when the push rod reaches the 1.8 ml cassette setting position, The rear end surface of the pressure bar is pressed rearward to store the return spring. Therefore, in any case of a click, in order to discharge the anesthetic liquid from the cassette through the injection needle, the plunger rubber plug of the cassette is pushed by the forward linear movement of the push rod, but In the case of a 1.8 ml cassette, the sleeve is moved forward with the push rod by the action of the return spring of the surrounding flange until it abuts against the drive unit.

Referring to Fig. 1 of the drawings, the electric syringe 1 of the present invention includes a syringe body 2 made of plastic, and is provided with a metal cassette that is detachably loaded with an anesthetic liquid-filled cassette 3 The device 4 is attached to the joint 5 at the front end portion thereof. The coupling joint 5 is attached to the syringe body 2, and the screw is coupled to a metal support body 9 having a through hole 7 through which a metal rod-shaped pressing rod 6 is passed through, and When the cassette holder 4 is mounted on the joint 5, the receiving opening 8 of the cassette holder 4 can be received.

The cassette holder 4 is provided on its opposite side with a convenient and practical window 4a, 4b for confirming the cassette loaded therein, and is provided as: a card shared with 1.0 ml of anesthetic solution匣3b and a cassette 3a containing 1.8 ml of anesthetic fluid, and having a rear end surface 4' of a cassette holder 4 that is abuttable to the bottom of the receiving opening 8 when it is mounted on the coupling joint 5 . The pressing rod 6 is provided with a contact body 11 having a plunger rubber plug 10 that abuts against the cassette 3 from the rear end, and a flat rack 12 is formed on one side of the pressing rod 6 at a rear side thereof. The pressing rod 6 may be any length that is required to push the plunger rubber plug 10 of the 1.0 ml cassette 3b to discharge all of the anesthetic liquid therein.

The electric injector 1 includes an actuating device 15 fixed to the main body 2, and the actuating device 15 is provided with a driving unit 16 including a motor and a speed reducer (not shown), and a pinion 17 fixedly mounted to the output shaft thereof. It is engaged with the rack 12 of the push rod 6. The component symbol 18 is a clutch lever 19 that can be connected to the clutch (not shown) of the drive unit 16 by pressing the rear end face 4' when the latch holder 4 is inserted into the receiving port 8. The clutch is released from the position to the lever of the clutch engagement position. The control rod 18 is inserted into the support body 9 through a through hole 20 provided in parallel with the through hole 7 for the pressing rod 6, and is sucked from the receiving port 8 when the cassette holder 4 is detached from the joint joint 5. At the time of pulling out, the clutch lever 19 is returned to the clutch release position by the action of the coil-shaped tension spring 21, thereby moving forward toward the receiving port 8. The clutching of the drive unit 16 is released by the application operation of the clutch lever 19, and the power transmission to the pinion gear 17 is blocked, and the push bar 6 can be manually moved.

In the retracted position of the push rod 6, there is a bottomed sleeve 22 which can receive the rear end portion thereof, and the sleeve 22 has a difference in length from the 1.0 ml anesthetic solution and 1.8 ml of the anesthetic solution. A slightly longer size is preferred. The coil return spring 23 is disposed around the sleeve 22, and has one end abutting against the peripheral flange 24 of the sleeve 22, and the other end abutting against the shoulder of the inner hole 25 provided at the rear end of the electric injector body 2. In the normal portion 26, the sleeve 22 is biased against a part of the drive unit 16 in an abutting state. In this state, the sleeve 22 is located at a position close to the rear end surface of the pressing rod 6. Further, the reference numeral 27 is a main switch of the electric injector, and the reference numeral 28 is a micro switch which is switched on when the push rod 6 is moved by a predetermined distance and is opposed to the recess 29 provided in the push rod 6. The rotation of the motor of the drive unit 16 is stopped for off. Reference numeral 30 is a battery case that is a power source of a motor or the like.

In the case of using the cartridge 3b of 1.0 ml of the anesthetic solution, the cartridge 3b is loaded into the cartridge holder 4, and the cartridge holder 4 is inserted into the receiving port 8 while being abutted to the bottom thereof. The joint 5 is joined. During this process, when the plunger rubber plug 10 of the cassette 3b abuts against the abutting body 11, the pressing rod 6 is pushed slightly rearward, thereby establishing that the rear end surface of the pressing rod 6 is not in contact with The extent of the bottom of the sleeve 22 is the set position of the closest cassette 3b.

In the case of using the cassette 3a of 1.8 ml of the anesthetic liquid, the cassette 3a is loaded into the cassette holder 4, and the cassette holder 4 is inserted into the receiving port 8 and connected to the bottom of the cassette holder 4. The joint 5 is joined in the same manner as the cassette 3b, but the plunger rubber plug 10 of the cassette 3b pushes the push rod 6 rearward after the abutment against the abutment body 11 and corresponds to the cassette 3a and Card 3b The distances that differ in length. At this time, since the rear end surface of the pressing rod 6 abuts against the bottom of the sleeve 22 to press the sleeve 22, the sleeve 22 passes through the inner hole 25 and protrudes rearward, and the coil return spring 23 is compressed. Therefore, the pressing rod 6 is pressed against the plunger rubber plug 10 of the cassette 3a under the large repulsive force of the coil return spring 23 to establish the set position of the cassette 3a.

In the electric syringe, a two-end injection needle (not shown) is attached to the front end of the cassette holder 4 to communicate with the inside of the cassette to complete the use preparation. The electric injector operates by operating the main switch 27 regardless of the type of jam. The push rod 6 is moved forward by the pinion 21 that is rotated by the power transmitted by the drive unit 16 and the rack 12, and the plunger rubber plug 10 of the cassette is pressed at the front end thereof to be inserted into the cassette. The anesthetic fluid is discharged through the injection needle. In the case of a 1.0 ml anesthetic solution, the linear movement of the push rod 6 is performed while pulling out from the sleeve 22 in the fixed state, pushing the front end of the rod, and finally reaching the end position to complete the injection. . In the case of a 1.8 ml anesthetic solution, the sleeve 22 is abutted against the push rod 6 with its front end surface abutting against the side surface of the drive unit 16 by the repulsive force of the compressed return spring 23. Move ahead. The movement of the sleeve 22 is stopped by abutment with the side surface of the drive unit 16, and the push rod 6 is pulled out from the sleeve 22 and linearly moved forward toward the front to reach the card located at 1.0 ml of the anesthetic solution. In the case of sputum, the injection is completed at the same terminal position.

Regardless of the type of click, the cassette holder 4 is detached from the joint joint 5 and taken out from the receiving opening 8 at the time of completion of the injection. At this point, as previously described, the push rod 6 can be freely pressed back toward the joint joint 5 by hand. In the pressback, the rear end portion of the push rod 6 enters the sleeve 22 in the set state. As described above, the set position of the sleeve 22 at the time of 1.0 ml of the cassette is not pressed by the rear end surface of the push rod and stays there, but at the set position of the 1.8 ml cassette, At the rear end surface of the push rod, one side is pressed toward the rear side as it is pressed against the return spring. Therefore, regardless of the type of click, in order to allow the anesthetic fluid to be discharged from the cassette through the injection needle, the plunger rubber plug of the cassette is pushed by the forward movement of the push rod, but the 1.8 ml card In the case of sputum, the sleeve is moved forward with the push rod by the action of the return spring.

According to the present invention, the cassette holder is used as a cassette holder which can be commonly used for a 1.0 ml cassette and a 1.8 ml cassette; the push rod is used to move the push rod in 1.0 ml cassette and 1.8 ml. The position common to the cassette has a position of 1.0 ml of the cassette setting position and a 1.8 ml cassette setting position that is retracted from the position, and includes: when the push rod is from the above-mentioned common terminal When the position is pressed back, the bottom sleeve of the rear end portion of the pressing rod can be received, and when the pressing rod is pressed back to the 1.8 ml chuck setting position, the sleeve is pushed rearward by pushing the rear end surface of the rod Pressing, a return spring for moving the sleeve forward with the push rod 6 when the push rod moves forward, so the push rod of the length necessary to push the plunger rubber plug of 1.0 ml is used. A plunger rubber plug of 1.8 ml can be pushed. From this, it can be understood that in the present invention, the size and shape of the electric injector can be made compact.

1. . . Electric injector

2. . . Syringe body

3. . . Anesthetic fluid filling card

3b. . . 1.0ml card

4. . . Cartridge holder

4a, 4b. . . Windows

4’. . . Rear end face

5. . . Link connector

6. . . Push rod

7. . . Through hole

8. . . Receiving mouth

9. . . Support

10. . . Plunger rubber plug

11. . . Abutment

12. . . rack

15. . . Actuating device

16. . . Drive unit

17. . . gear

18. . . Controller

19. . . Clutch lever

20. . . Through hole

twenty one. . . Tension spring

twenty two. . . Bottom sleeve

twenty three. . . Coil return spring

twenty four. . . Surrounding flange

25. . . Bore

26. . . Shoulder

27. . . Main switch

28. . . Micro Switch

29. . . Concave

30. . . Battery case

Fig. 1 is a cross-sectional side view showing the electric syringe of the present invention which is stuck with 1.0 ml of anesthetic solution.

Fig. 2 is a plan sectional view showing the electric injector of Fig. 1.

Fig. 3 is a cross-sectional side view of the electric injector of the present invention which is jammed with 1.8 ml of anesthetic fluid.

Figure 4 is a perspective view of the push rod.

1. . . Electric injector

2. . . Syringe body

3. . . Anesthetic fluid filling card

3b. . . 1.0ml card

4. . . Cartridge holder

4a, 4b. . . Windows

4’. . . Rear end face

5. . . Link connector

6. . . Push rod

7. . . Through hole

8. . . Receiving mouth

9. . . Support

10. . . Plunger rubber plug

11. . . Abutment

12. . . rack

15. . . Actuating device

16. . . Drive unit

17. . . gear

18. . . Controller

19. . . Clutch lever

twenty one. . . Tension spring

twenty two. . . Bottom sleeve

twenty three. . . Coil return spring

twenty four. . . Surrounding flange

25. . . Bore

26. . . Shoulder

27. . . Main switch

28. . . Micro Switch

29. . . Concave

30. . . Battery case

Claims (3)

The utility model relates to a power injector capable of using two kinds of cassettes for dental anesthesia liquid, wherein a cassette holder filled with an anesthetic liquid cassette is mounted on the electric injector body by a connecting joint, and is driven by the driving unit The rotating pinion gear is meshed with the rack of the push rod, so that the push rod moves slowly, and pushes the plunger rubber plug with the anesthetic liquid cartridge to make the anesthetic liquid in the cassette from the card牙科 A dental anesthetic fluid composed of a method of discharging by means of an injection needle is filled with a cartridge type electric syringe, which is characterized in that the cassette holder is used as a cassette holder which can be commonly used for a 1.0 ml cassette and a 1.8 ml cassette. The push rod is such that the movement of the push rod can be terminated at a terminal position common to the 1.0 ml cassette and the 1.8 ml cassette which are filled to the cassette holder: 1.0 ml card匣 setting position and a 1.8 ml cassette setting position retracted from the position; and including a bottomed sleeve and a coil return spring for receiving the push back from the common terminal position The rear end of the rod, and when the push rod is located in the 1.0ml cassette When the position is not interfered by the rear end surface of the push rod, when the push rod is pressed back to the 1.8 ml chuck setting position, the sleeve is pushed rearward by the rear end surface of the push rod; the coil is reset The spring is used to move the sleeve forward together with the push rod when the push rod moves forward. For example, in the first application of the patent scope, two types of electric syringes equipped with a cartridge for dental anesthetic fluid can be used, wherein the coil return spring is configured Around the bottomed sleeve, one end abuts against: a peripheral flange formed at a front end of the sleeve, and the other end abuts against a shoulder of the inner hole provided at the rear end of the power injector body And in a normal state, the sleeve is elastically pressed against a part of the driving unit in an abutting state, and in this state, the sleeve is located at a position close to the end surface of the pressing rod, and when the rod is pressed, the end surface will be When the sleeve is pressed rearward, the sleeve protrudes through the inner hole provided at the rear end of the motor injector body. For example, the electric syringe of the two types of cartridges containing dental anesthetic fluid can be used in combination with the first or second patent application, wherein the sleeve has a length of more than 1.0 ml of anesthetic solution and 1.8 ml of anesthetic solution. The difference is also slightly longer.