TWI573604B - Tooth - type electric syringe with anesthesia - Google Patents

Description

Dental anesthetic fluid filled with cartridge type electric syringe

The invention relates to an anesthetic liquid filling card type electric injector, in particular to a power injector with an improved pressing rod, which is used for pushing a plunger rubber plug for discharging the card. Anesthetic fluid in the sputum.

The card is made of glass and is filled with a local anesthetic injection for dental use. The content 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 varies depending on the amount of the content.

In any case, when anesthesia is being processed, the power injector generally loads the cassette in the cassette holder, and mounts the cassette holder to the connector of the power injector, and then mounts the two injection needles on the front end of the cassette. use. The electric injector includes a pressing rod for pressing a plunger rubber plug for pressing the cartridge to be discharged from the cassette through the injection needle, and an actuating mechanism for moving the pressing rod forward. The actuating mechanism generally includes a pinion gear that is rotated by power transmission of a driving unit including a motor and a speed reducer, and a rack that is formed on the pressing rod and engages the pinion gear. In order to completely discharge the anesthetic fluid from the cassette loaded in the cassette holder, it is necessary to push the plunger to advance the plunger by pushing the plunger through the rotation of the pinion, and the plunger is moved from the syringe. The distance from the anesthetic fluid contained in the card. The moving distance of the pressing rod is restricted by stopping the rotation of the motor by setting the limit switch to OFF at the rear end of the pressing rod. After the injection solution is discharged, the cassette holder is removed from the connector, the power transmission of the drive unit is cut off, the pinion gear is idling, and the pressing rod is pressed back to the same distance by the hand in the syringe body. In the process, the limit switch is set to an ON state outside the push bar. Although it is also related to the setting position of the limit switch, the pressing rod must be formed to extend rearward from the pinion gear, and the extension length thereof is only the length of the anesthetic liquid storage length corresponding to the cassette, plus the equivalent of the pinion gear and the limit switch. The length between the distances. Therefore, the push rod of the electric injector has a long size, and as a result, the electric syringe must be designed in a long and bulky form. Therefore, the dental physician industry is strongly looking forward to the emergence of a more compact card-type electric syringe.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dental anesthetic liquid filled with a cartridge type electric syringe, which is shorter in shortening the pressing rod in order to satisfy the expectation, and the pressing rod can be sent out from the cassette for the distance required to discharge the anesthetic liquid.

The object of the present invention is achieved by providing a dental anesthetic fluid filled with a cartridge type electric syringe, which uses a pinion gear and a circular shape rotated by a driving unit. Engaging the rack of the stick, causing the push rod to move slowly, pushing the plunger of the anesthetic fluid to fill the plunger, so that the anesthetic fluid is discharged from the cassette through the injection needle, characterized in that it comprises: an extension tube, It is movably disposed in a through hole of the support block, the pressing rod is movably inserted, and the side surface has a rack formed by integrating with the rack of the pressing rod; and means for pulling the extension tube, which is a pressing rod The means for pulling the extension tube in order to engage the rack of the extension tube with the pinion when reaching the middle of the distance corresponding to the anesthetic liquid storage length of the cassette; the pressing rod is a rack by the extension tube Engages with the pinion gear and moves with the extension tube to move the remaining distance of the distance corresponding to the anesthetic fluid storage length of the aforementioned cassette.

In a preferred embodiment of the present invention, the method comprises: means for liberably bonding to the support block, wherein the extension tube does not move the support block during the movement of the pressing rod, and the bonding means is formed by the front end portion of the extension tube a locking ball received by the holding hole; and a part of the locking ball pushed out from the outer surface of the extension tube 11 by the circular outer surface of the pressing rod is engaged in the holding hole in order to fix the extension tube to the support block And a recess formed in the through hole of the support block. Further preferably, the method further includes: when the pressing rod reaches the middle of the distance corresponding to the anesthetic liquid storage length of the cassette, in order to release the coupling of the extension tube to the support block, the concave portion is formed on the outer surface of the pressing rod opposite to the locking ball .

Preferably, the extension tube includes a front portion having an inner diameter substantially equal to an outer diameter of the pressing rod, and a rear portion having an inner diameter larger than an inner diameter of the front portion; the joint portion of the front portion and the rear portion is divided into a shoulder portion; the means for pulling the extension tube is provided at a rear end portion of the pressing rod, and is constituted by a protrusion that moves in a rear portion of the extension tube and abuts against the shoulder portion.

Referring to Fig. 1 of the drawings, the electric syringe 1 of the present invention includes a syringe body 2 indicated by a chain line, and a distal end portion thereof is provided with a connector 3 which is detachably mounted and filled with an anesthetic fluid filling cassette (none The card holder of the illustration) (not shown). The connector 3 is attached to the mounting block 4 of the syringe body 2, and is screwed tightly to the support body 7, and has a through hole 6 through which a metal round bar-shaped pressing rod 5 passes.

As shown in FIG. 1 and FIG. 3 to FIG. 6 , the pressing rod 5 is a contact body 8 having a projecting diameter of a plunger rubber plug (not shown) that abuts against the clicker at the distal end portion, and the pressing rod 5 is pressed on the rod. A flat rack 9 is formed on one side of the rear portion of 5. As is apparent from Figs. 1 to 4, the metal extension tube 11 is movably inserted into the through hole 14 of the support block 13 attached to the mounting block 12 of the syringe body 2, and the pressing rod 5 is inserted into the extension tube 11. The extension tube 11 is most clearly illustrated in Figures 7 and 8, and is formed to be horizontally cut along its longitudinal direction to the vicinity of its rear end, on both sides of the rack 9 of the pressing rod 5 and the teeth of the pressing rod 5. The strips 9 are in the same plane with the racks 15, 15 integrated with the rack 9. However, the front end portion of the extension pipe 11 has flat faces 16 and 16 which are not provided with rack teeth for the reason described later. The hollow front portion 17 of the extension pipe 11 has an inner diameter corresponding to the outer diameter of the pressing bar 5 until it is near the middle of the length of the longitudinal direction of the racks 15, 15, and the hollow rear portion 18 has a hollow portion therein. The inner diameter of the front portion 17 is also large, so that the outer protrusions 19 provided in the radial direction of the rear end portion of the pressing rod 5 are movable. As a result, the rear end surface of the inner surface of the hollow front portion 17 is divided into shoulders 20, which are where the protrusions 19, 19 abut when the pressing rod 5 moves against the extension tube 11.

The electric injector 1 is provided with a driving unit including a motor and a speed reducer, and is fixed to the output shaft thereof; the pinion gear 21 supported by the support block 13 is formed to form the rack 9 with the pressing rod 5, and then the rack 9 and the extension The racks 15, 15 of the tube 11 are engaged. Means 22 are provided for restricting the retracted position of the extension tube 11, and the extension tube 11 is coupled to the support block 13 so as not to move against the support block 13, the bonding means comprising: a retaining hole formed by the front end portion of the extension tube 11 23 of the locking ball 24 that is received; and a part of the locking ball 24 that is pushed out from the outside of the extension tube 11 by the circular surface of the pressing rod 5 in the holding hole 23 in order to join the extension tube to the support block The recess 25 formed in the through hole 14 of the support block 13 is formed. When the extension tube 11 is coupled to the support block 13, the pinion gear 21 is not meshed with the rack 9 of the pressing rod 5, but since the pinion gear 21 is opposed to the flat surfaces 16, 16 without the rack teeth, it does not The racks 15, 15 of the extension tube are engaged.

The moving distance of the pressing rod 5 corresponding to the anesthetic liquid storage length of the cassette is designed such that when the pressing rod 5 is moved by half the distance, that is, 25 mm, the projections 19 and 19 are engaged with the shoulder 20 when the pressing rod 5 is moved by half.

The extension pipe 11 is fitted with a stopper ring 26 that abuts against the front surface of the support block 13 at its front end in order to restrict its retracted position. Further, in order to push the extension tube 11 back to the retracted position by the retraction of the pressing rod 5, and to stop the stopper ring 27 on the front end surface of the extension tube 11 in order to restrict the retracted position of the pressing rod, the pressing rod 5 is disposed. Adjacent to the rack.

A cassette holder (not shown) filled with an anesthetic fluid filling cassette (not shown) is attached to the syringe 1 by the connector 3, whereby it is assumed that the pressing rod 5 and the extension tube 11 are in the retracted position ( Refer to Figure 1). The extension tube 11 is coupled to the support block 13 by the engagement of the locking ball 24 and the recess 25 as described above, and thus stays in its retracted position. The pressing rod 5 is advanced by the meshing of the pinion 21 and the rack 9 which are rotated by the power transmission of the drive unit, and presses the plunger rubber plug (not shown) at the front end thereof. Thereby, the anesthetic fluid is discharged from the cassette through the injection needle. When the rear end projections 19, 19 of the pressing rod 5 are engaged with the shoulder 20, the concave portion 28 formed on the circular surface of the pressing rod 5 is opposed to the locking ball 24 in the holding hole 23 and allows the locking ball 24 to be The concave portion 25 of the support block 13 is retracted, so that the combination of the extension tube 11 and the support block 13 is released (see Fig. 3). As a result, as the pressing rod 5 continues to advance, since the rear end projections 19, 19 of the pressing rod 5 are engaged with the shoulder 20, the racks 15, 15 of the extension tube 11 are pulled to the position where the pinion 21 is meshed. The pinion gear 21 meshes with the rack 9 of the pressing rod and the racks 15 and 15 of the extension tube 11, and advances the pressing rod 5 and the extension tube 11 together, and moves the pressing rod 5 to move the anesthetic liquid corresponding to the cassette. The distance of the length (refer to Figure 4). At this time, the limit switch 29 is closed at the rear end of the extension pipe 11, and the motor of the drive unit is stopped.

After the injection solution is discharged, the cassette holder is removed from the connector, and the power transmission of the drive unit is cut off to make the pinion gear idling, and the push rod is pushed back into the syringe body by hand. Since the pinion 21 meshes with the rack 9 of the push bar 5 and the racks 15, 15 of the extension tube 11, there is no relative movement between the push bar and the extension tube and is pushed back together by the stop ring 26 The extension tube 11 is stopped by abutting against the support block 13. At substantially the same time, the flat surfaces 16 and 16 of the extension tube 11 without the rack teeth face the pinion 21, and the locking ball 24 faces the recess 25 and is radially outward by the circular surface of the pressing rod 5. The push-out causes a part of the ball to engage with the recess 25, thereby joining the extension tube 11 to the support block 13, and only the pressing rod 5 continues to be pushed back toward the rear, but the stop ring 27 abuts against the front end surface of the extension tube 11. The push bar is stopped and pushed back (see Fig. 1).

According to the present invention, although it is also related to the installation position of the restriction switch, the push bar is designed such that the extension tube is made by the rack and the pinion in the middle of the distance of the anesthetic liquid storage length corresponding to the click of the click bar. The movement with the pressing bar allows the pressing bar to be shortened only by the length of the distance between the limit switch and the pinion, and a relatively compact card type electric injector can be provided.

1. . . Electric injector

2. . . Syringe body

3. . . Connector

4,12. . . Mounting block

5, 6. . . Press bar

7. . . Support

8. . . Abutment

9, 15. . . rack

11. . . Extension tube

13. . . Support block

14. . . Through hole

16. . . Flat surface

17. . . Hollow front part

18. . . Hollow rear part

19. . . Radial outward protrusion

20. . . shoulder

twenty one. . . gear

twenty two. . . means

twenty three. . . Hold hole

twenty four. . . Catch ball

25, 28. . . Concave

26, 27. . . Stop ring

29. . . Limit switch

Fig. 1 is a plan view schematically showing a cartridge-type electric syringe equipped with a pressure bar of the present invention and an anesthetic fluid for dental use.

Figure 2 is an elevational view of a portion of the drive unit that has been cut away to show the pinion and rack sections.

Fig. 3 is a view substantially similar to Fig. 1 in the middle of moving the pressing rod to a distance corresponding to the anesthetic liquid storage length of the cassette.

Fig. 4 is a view substantially the same as the first figure, in which the pressing rod and the extension tube are moved by the distance corresponding to the distance of the anesthetic liquid storage length of the cassette.

Figure 5 is a top view of the pressing rod.

Figure 6 is a side view of the pressure bar.

Figure 7 is a side view of the extension tube.

Figure 8 is a cross-sectional plan view of the extension tube.

1. . . Electric injector

2. . . Syringe body

3. . . Connector

4,12. . . Mounting block

5, 6. . . Press bar

7. . . Support

8. . . Abutment

9, 15. . . rack

11. . . Extension tube

13. . . Support block

14. . . Through hole

19. . . Radial outward protrusion

20. . . shoulder

twenty one. . . gear

twenty two. . . means

twenty three. . . Hold hole

twenty four. . . Catch ball

25, 28. . . Concave

26, 27. . . Stop ring

29. . . Limit switch

Claims (4)

A dental anesthetic liquid filled with a cartridge type electric syringe, which utilizes the meshing of a pinion rotated by a driving unit and a rack of a circular pressing rod to slowly move the pressing rod, and pushes the anesthetic liquid filling card a plunger rubber plug for discharging the anesthetic fluid from the cassette through the injection needle, characterized by comprising: an extension tube movably disposed in the through hole of the support block, the pressing rod being movably inserted, and a side surface having a rack formed by integration with a rack of the pressing rod; and means for pulling the extension tube, when the pressing rod reaches the middle of a distance corresponding to the anesthetic liquid receiving length of the cassette, the pressing rod is for the extension tube The rack is meshed with the pinion gear for pulling the extension tube; the pressing rod is moved by the extension tube to move the anesthetic liquid storage length corresponding to the aforementioned cassette by the engagement of the rack and the pinion of the extension tube The remaining distance among the distances. The dental anesthetic liquid filled with the cartridge type electric injector according to the first aspect of the patent application, wherein the method comprises: means for liberably bonding to the support block, so that the pressing rod moves, the extension tube does not support the support block Moving, the joining means is a locking ball received by the retaining hole formed by the front end portion of the extending pipe; and in order to fix the extending pipe to the supporting block, it is pushed from the outside of the extending pipe 11 by the circular outer surface of the pressing bar A part of the inserted ball is engaged with the recess formed in the through hole of the support block. The dental anesthetic liquid according to the first aspect of the patent application is filled with a cartridge type electric syringe, wherein when the pressing rod reaches the middle of the distance corresponding to the anesthetic liquid storage length of the cassette, the extension tube pair support block is released. a combination of the above-mentioned locking ball and formed on the outside of the pressing rod Concave. The dental anesthetic liquid according to claim 1 is filled with a cartridge type electric syringe, wherein the extension tube includes an inner portion having an inner diameter substantially equal to an outer diameter of the pressing rod, and has an inner portion than the front portion a rear portion of the inner diameter having a large diameter; the joint portion of the front portion and the rear portion is divided into a shoulder portion; and the means for pulling the extension tube is disposed at a rear end portion of the pressing rod, and is disposed in a rear portion of the extension tube It is formed by a protrusion that moves and abuts on the aforementioned shoulder.