JP2001000543A - Device for confirming injecting speed of injection liquid in motor-driven injector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit the injecting speed of an injection liquid to be correctly proportioned to the interval of flickering in an LED lamp and to be displayed in spite of a characteristic intrinsic to a motor which is assembled inside a motor-driven injector at every implement. SOLUTION: In the motor-driven injector A, a rotary board 7 having reflection bodies 70... at fixed interval in a peripheral direction on a peripheral surface is arranged in the reduction gear main shaft 50 of a reduction mechanism 5 which is incorporated to operate and decelerate a driving mechanism (d) in a body (a). A photosensor 8 having a light projecting element 60 and a light receiving element 81 is disposed in the circumference of the board 7 to permit the receiving element 81 to receive a reflection light which is projected from the projecting element 80 and reflected by a collision with the reflection bodies 70 on the peripheral surface of the board 7 and transmits a detecting signal. Whenever the photosensor 8 executes the detecting operation, an LED lamp 4 is turned on, which is disposed at the outer surface side of the main body (a) and consists of a light emitting diode.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a syringe used when a dentist injects an injection such as an anesthetic into a patient's gingiva in dental care. The present invention relates to an improvement in a confirmation means for visually discriminating an injection speed of an injection solution in a dental electric syringe in a form performed by a pushing pressure of a plunger driven by operation.

[0002]

2. Description of the Related Art A conventional dental electric syringe A is usually
As shown in FIG. 1, an operation is formed in the shape of a shaft cylinder having an axial direction in the front-rear direction on the upper end side of a grip portion 1 formed in a shape of an axial tube having a thickness that can be gripped by a palm and having an axial direction in the vertical direction. A main body a provided integrally with the unit case 2 so as to be substantially L-shaped or T-shaped, and a cartridge holder b removably mounted on a front end side of the operating unit case 2; When it is not used, the lower end of the holding portion 1 of the main body a is fitted to the holding base 3 which also functions as a charger when the holder b is detachably attached to the front end of the holder b. And, at the same time, charge the CADNICA storage battery 10 incorporated in the grip portion 1.

As shown in FIG. 2, the above-mentioned rechargeable CADNICA rechargeable battery 10 is incorporated in the gripping portion 1 and a contact 11. 1 for charging the rechargeable battery 10 is provided on the bottom thereof.
1 is provided so that the contacts 11 are brought into contact with the contacts provided on the holding base 3 and the adapter 30 connected to the holding base 3 is connected to a power socket so that charging is performed. Become.

[0004] In addition, an upper portion of the front side of the grip portion 1 includes:
By the pushing operation, the drive circuit of the motor M incorporated in the operation unit case 2 is turned on, and the motor M is rotated forward to rotate the motor M as shown in FIG.
The forward switch SW1 for moving the operating rod 20 incorporated in the motor in the forward direction, and the reverse switch SW2 for moving the operating rod 20 in the reverse direction by reversing the direction of the current flowing through the motor M by the pushing operation, and A control dial D is provided at the lower portion on the front side of the control dial D to rotate and operate a variable resistor provided in the drive circuit of the motor M to change and change the rotation speed of the motor M as desired. Is provided.

[0005] The operating part case 2 has a
And the drive mechanism d for performing the forward operation of pushing the operating rod 20 forward (to the left in FIG. 2) and the backward operation of retracting the same backward by driving the motor M.

The drive mechanism d includes a bevel gear G1 provided on the output shaft of the motor M, a bevel gear G2 supported in the operating portion case 2 so as to mesh with the bevel gear G1, and a small diameter provided on a rotating shaft of the bevel gear G2. Pinion gear G3
A large-diameter gear G4 pivotally supported so as to mesh with the gear G3, and a pinion p provided on a rotation shaft of the gear G4.
A rack r provided on the operating rod 20 so that the pinion p meshes with the rack r. When the motor M is driven, the gears G1, G2, G3, and G4 are sequentially transmitted to the pinion p to drive the rack r. In this way, the operation of the operating rod 20 is performed.

In this drive mechanism d, a frame f which supports a pinion p thereof is rotatably mounted around a fulcrum shaft g on an operating portion case 2 and is attached by a spring to the fulcrum shaft g in FIG. The pinion p is engaged with the rack r from the lower surface side by urging it to rotate clockwise to the center, and the release knob 12 provided at the upper end portion on the rear surface side of the grip portion 1 is provided with a spring. By pushing up against the bias, the frame f rotates counterclockwise about the fulcrum axis g, disengages the pinion p from the rack r, and the operating rod 20 freely moves back and forth. It is made to become.

The operating rod 20 has a front end provided with a harpoon section 200 and an annular connecting metal fitting 21 at the front end of the operating section case 2.
The rack r is engaged with the pinion p and integrally formed on the lower surface thereof so as to enter and exit through the through hole of the shaft portion.

An LED lamp 4 composed of a light emitting diode is mounted on a portion of the upper surface side of the operating portion case 2 which is closer to the front end, and the LED lamp 4 is a motor M built in the operating portion case 2. Is detected by a noise detection circuit by a noise detection circuit, and the detection signal is controlled by a control circuit for setting an appropriate frequency division ratio so as to be sent to the LED lamp 4.
When the motor M rotates, it is proportional to the rotation speed,
In addition, blinking is repeated at intervals much slower than the rotation speed.

This control circuit is provided with a function of rotating the dial D provided on the front side of the gripper 1 to operate the variable resistor, thereby changing the rotation speed of the motor M when the rotation speed of the motor M is changed. In the speed, the rotation pulse LED 81 repeats blinking at intervals according to the rotation speed.

Thus, for example, when an anesthetic is injected into a patient's gingiva, a cartridge e filled with the anesthetic is loaded into the cartridge holder b, and the proximal end of the cartridge holder b is Attach to the front end of the operating part case 2 of the main body a, attach both injection needles c to the tip side of the cartridge holder b, assemble the electric syringe A, and operate the gripper 1 with one hand. By doing so, the dentist, while holding a predetermined location in the oral cavity of the patient with the other hand, when the injection of anesthetic is performed by electric, the injection speed of the injection solution set by the dial D operation, The light emission interval of the LED lamp 4 provided at the front end portion of the upper surface of the operating portion case 2 of the main body a can be visually confirmed by looking at the interval.

[0012]

The means for confirming the injection speed of the injection solution in the conventional electric syringe described above is based on the fact that the flashing interval of the LED lamp changes in proportion to the rotation speed of the motor. Although the confirmation can be performed, since the rotation speed of the motor is detected by a brush, the LED lamp corresponding to the injection speed of the injection liquid blinks for each electric syringe due to the difference in the unique characteristics of the motor. Intervals become different, and in a clinic having many clinics, since the electric syringe is set for each clinics, the LED lamps of the motorized syringe blink at different intervals at the same injection speed. Therefore, there is a problem that a dentist may be confused when performing a medical treatment / treatment while changing a medical table.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem occurring in the conventional means, and is provided for each electric injector, even if the motor assembled in the body has a unique characteristic. It is another object of the present invention to provide a new means for displaying the injection speed of the injection solution in exactly proportion to the blink interval of the LED lamp.

[0014]

According to the present invention, as a means for achieving the above object, a motor M and a driving mechanism d driven by the motor M are provided inside a main body a.
And an operating rod 20 that moves in the front-rear direction by the operation of the drive mechanism d. The operation of the motor M causes the operating rod 20 to be mounted in the cartridge e loaded in the cartridge holder b mounted on the front end of the operating part case 2. In the electric syringe A for extruding the injection solution, the reduction gear main shaft 50 of the reduction mechanism 5 incorporated in the main body a so as to reduce the speed of the drive mechanism d.
, A rotating disk 7 provided with reflectors 70... At predetermined intervals in the circumferential direction on the peripheral surface, and a photosensor having a light projecting element 80 and a light receiving element 81 around the rotating disk 7. 8
Is reflected from the light projecting element 80 and collides with the reflector 70 on the peripheral surface of the turntable 7 and is reflected by the light receiving element 81.
Are arranged so as to receive light and transmit a detection signal, and each time the photosensor 8 performs a detection operation, the LED lamp 4 composed of a light emitting diode provided on the outer surface side of the main body a emits light. The present invention proposes a device for confirming the injection speed of an injection solution in an electric syringe.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The means for confirming the injection speed of an injection solution in a motor-operated syringe according to the present invention is the same as that of the conventional motor-operated syringe itself. A cylindrical operating portion case having an axial direction in the front-rear direction is integrally or continuously connected to the side to form a main body case having a substantially L-shaped or T-shaped overall shape,
At the front end of the operating part case, a cartridge holder is detachably mounted, and at the front end of the holder, both needles are removably mounted. Inside the main body case, the front end of the operating part case is provided. An operating rod which is slidably inserted in the operating part case in the front-rear direction so as to be able to enter and exit the cartridge holder from the side, a drive mechanism for operating the same, a motor and a deceleration mechanism for operating the drive mechanism, and a storage battery. A push-out switch and a pull-in switch for controlling the operation of the drive mechanism are provided on the outer surface side of the drive rod so that the operating rod is pushed forward and retracted backward. About the provision of a dial for operating a variable resistor for controlling the rotation speed of the motor by controlling the It may be configured similarly to that of the previous unit means.

When the injection liquid is injected into a patient using the electric syringe, the injection speed of the injection liquid is confirmed by the blinking interval of an LED lamp provided on the outer surface side of the main body case. This may be configured in the same manner as the conventional means. However, the blinking of the LED lamp is performed by the reduction mechanism and the drive mechanism that transmit to the motor shaft so that the drive mechanism for moving the operating rod in and out is operated at a reduced speed. A rotating disk is provided on a reduction gear main shaft provided therebetween, and a reflecting plate is provided on a peripheral surface thereof at a predetermined interval in a circumferential direction, and a photosensor including a light emitting element and a light receiving element is provided at a portion opposed to the reflecting plate. An LED lamp consisting of a light emitting diode is provided on the outer surface of the main body case every time the light emitted from the light emitting element is reflected by the reflector on the peripheral surface of the turntable and detected by the light receiving element. So as to light, so that light emission of the LED lamps is performed at an interval proportional to the rotational speed of the reduction gear spindle.

The rotating disk provided on the reduction gear main shaft utilizes a boss portion of a bevel gear mounted on the reduction gear main shaft, and a white portion and a black portion are formed on the peripheral surface thereof at a constant interval with a bar code shape. Or by forming a continuous groove along the axial direction on the peripheral surface of the boss portion of the reduction gear at a predetermined interval in the circumferential direction, and forming a bottom surface of the concave groove. A reflective plate or a light-colored paint may be applied to the surface, and the remainder may be coated with a black or dark-colored paint.

As a result, the LED lamp emits light at intervals directly proportional to the rotation speed of the reduction gear main shaft for decelerating the driving mechanism of the operating rod, and the light emission interval is a characteristic characteristic of the motor. Even if there is, the injection speed of the injection liquid according to the pushing speed of the operating rod by the drive mechanism is correctly proportional.

[0019]

Next, an embodiment will be described with reference to the drawings. In the drawings, the same reference numerals are used for components having the same effects as those of the conventional means.

FIG. 3 is a vertical sectional side view of the electric syringe A embodying the present invention, FIG. 4 is a cross-sectional plan view of the same, FIG. 5 is a vertical cross-sectional view of the drive mechanism part of the same, and FIG. FIGS. 3A and 3B are partially cutaway side views of a release mechanism portion of the drive mechanism. In these figures, a denotes a grip portion 1 and an operating portion case 2 integrally connected to an upper portion of the grip portion 1. The formed main body case, b is a cartridge holder removably attached to the front end of the operating part case 2 of the main body case a, and c is both needles detachably mounted on the front end of the cartridge holder b. Indicates a driving mechanism, and e indicates a cartridge loaded in the cartridge holder b.

Reference numeral 20 designates a front-rear direction (FIG. 3)
An operating rod that can be slidably stored in the left and right directions in FIG. 4, and a rack r is formed on a lower surface of the operating rod except for a front end (the left end in FIGS. 3 and 4). The front end formed in the shape of a shaft faces the opening 22 formed in the front end face of the operating part case 2, from which the drive mechanism d in which the pinion p meshes with the rack r is actuated.
The cartridge 22 protrudes into the cartridge holder b whose base end is connected to the opening 22, and is drawn into the operation unit case 2.

The driving device d is a small-diameter bevel gear G1 fitted on a reduction gear main shaft 50 projecting upward from a reduction mechanism 5 that communicates with an output shaft of a motor M housed in the grip portion 1.
0, a large-diameter bevel gear G11 supported in the operating portion case 2 by a left-right rotating shaft 60 crossing below the operating rod 20 in mesh therewith, and fitted to a shaft end of the rotating shaft 60. A small-diameter gear G12 and a small-diameter gear G1 which is disposed so as to traverse the lower side of the operating rod 20 to the left and right and is fitted to the shaft end of a rotating shaft 61 supported in the operating portion case 2.
2, a large-diameter gear G13 meshed with the rotary shaft 6
And a pinion p fitted into a portion of the operating rod 20 located below the operating rod 20.
Meshing with a rack r provided on the lower surface side of the gear, the rotation of the reduction gear main shaft 50 causes conduction from the small-diameter bevel gear G10 to the large-diameter bevel gear G11, the small-diameter gear G12, the large-diameter gear G13, and the pinion p in this order. By driving the pinion p, the rack r is driven, and the operating rod 20 is slid back and forth.

The pinion p of the driving mechanism d is
A frame 63 supported by the rotating shaft 61 so as to swing in the front-rear direction around a fulcrum shaft 62 in the operating part case 2.
The frame 63 is pivotally rotated clockwise around the fulcrum shaft 62 in FIG. 6 by a spring 64 and slides back and forth within a certain range in the operating part case 2. When it abuts against the piece 65 and pulls it to the endless range of the slide as shown in FIG.
The pinion p provided on the rotating shaft 61 occupies a position where the pinion p meshes with the rack r, and the release button 66 provided on the rear surface side of the grip portion 1 is pressed to push the pushing piece 65, whereby the frame 63 described above is pressed. Is tilted counterclockwise in FIG. 6 around the fulcrum shaft 62 so as to move downward with respect to the rack r and release the engagement with the rack r.

SW1 is a forward switch provided on the upper part on the front side of the gripping portion 1. When the switch is pressed, the drive circuit of the motor M is switched to the forward rotation side and turned on, and the reduction gear main shaft 50 is rotated forward. To cause the operating rod 20 to perform an operation of protruding forward. Then, the forward operation of the operating rod 20 is stopped when the projection 20a provided on the operating rod 20 abuts on the limit switch LSW1 provided on the ceiling in the operating section case 2, and the drive circuit is turned off. .

Reference numeral SW2 denotes a reverse switch, which is disposed below the forward switch SW1 and is provided on the front surface of the gripper 1. The drive circuit of the motor M is switched to the reverse side by being pushed to turn on, and the reduction gear main shaft is turned on. By reversely rotating 50, the operating rod 20 is caused to perform a reverse operation. The reverse operation is stopped when the projection 20a provided on the operating rod 20 abuts on the limit switch LSW2 provided on the rear part in the operating part case 2, and the drive circuit of the motor M is turned off.

D is the operating rod 20 by operating the switch SW1.
To advance the piston of the cartridge (ampoule) e loaded in the cartridge holder b to control the injection speed of the injection solution when the injection solution inside the cartridge is injected from the injection needle c into the patient's gingiva. The dial is provided at the lower part on the front side of the gripper 1, and by rotating the dial, the variable resistor is rotated to drive the motor M from the CADNICA storage battery 10 loaded at the bottom of the gripper 1. It regulates the current flowing through the circuit and acts to change and regulate the rotational speed of the motor.

B is a confirmation means for visually confirming the injection speed of the injection solution set by the operation of the dial D. The confirmation means B is provided on a reduction gear main shaft 50 projecting upward from the reduction mechanism 5 and an upper end thereof. The rotating disk 7 arranged and fitted below the small-diameter bevel gear G10 fitted on the side thereof, and the reflectors 70 mounted on the peripheral surface of the rotating disk 7 at regular intervals in the circumferential direction. And a photosensor 8 provided around the turntable 7 so that the light is emitted from the light emitting element 80 and the reflected light is received by the light receiving element 81, and the light receiving element 81 of the photosensor 8 sends out a detection signal by receiving the light. L consisting of a light emitting diode provided so as to emit light every time
The LED lamp 4 is arranged such that most of the LED lamp 4 is exposed to the outside through a through hole provided on the upper surface of the operating portion case 2 of the main body a, and the operating portion case 2
It is attached to the base plate provided inside.

As shown in FIG. 7, the rotary disk 7 has a disk-like shape in which cut-out concave grooves 71 extending along the axial direction are formed on the peripheral wall surface at regular intervals in the circumferential direction. Are formed on the reflectors 70 by applying a bright color paint such as white or by attaching a reflector to the bottom surfaces of the concave grooves 71.

Next, FIG. 8 shows another embodiment of the turntable 7. The rotating disk 7 in this example is formed in a disk shape,
A tape 74 on which a black portion 72 having a dark color such as black and a white portion 73 having a light color such as white is printed at a constant interval on the peripheral surface thereof is attached. The bright white portion 73 printed on the reflector 7 reflects the light emitted from the light emitting element 80 of the photo sensor 8.
This is an example in which it is set to 0.

FIGS. 9 to 12 show still another embodiment of the turntable 7 of the above. The turntable 7 in this example is
As shown in FIG. 9, when fitted to a reduction gear main shaft 50 protruding upward from the reduction mechanism 5, the small diameter bevel gear G10 fitted to the reduction gear main shaft 50 is previously fitted to the outer periphery of the boss portion 90. In combination, the small-diameter bevel gear G1
This is an example in which the rotating disk 7 is simultaneously mounted on the reduction gear main shaft 50 when the boss portion 90 of the 0 is assembled and fixed to the reduction gear main shaft 50 with the set screw 91.

The rotating disk 7 of this embodiment is made of a resin material and has a plurality of toothed rods 7 projecting downward on the lower end surface of the boss 7a fitted to the outer peripheral surface of the boss 90 of the bevel gear G10.
b ... are formed at positions spaced at regular intervals in the circumferential direction,
The boss 7a has a boss 90 of the bevel gear G10.
Is formed in a shape having an insertion hole 7c for the set screw 91 at a position overlapping with a screw hole 92 for fastening to the reduction gear main shaft 50 by the set screw 91.

The entire outer peripheral surface of the resin material molded into this shape is mirror-finished by vapor deposition and plating of a mirror agent such as mercury, so that the annularly arranged tooth rods 7b are mirror-finished. It is formed on the reflectors 70 of the body.

The boss 90 of the bevel gear G10 is
As shown in FIG. 9, the reflector 70
Are formed in a reduced diameter portion 93 having a small diameter, so that light from the light emitting element 80 of the photosensor 8 is transmitted to the tooth rod 7b. ... when passing between the reflectors 70 consisting of
The distance from collision with the peripheral surface of the reduced diameter portion 93 to reflection on the light receiving element 81 is increased so that detection by the light receiving element 81 is not performed.

[0034]

As described above, the means of the present invention comprises a reflector which is provided on a reduction gear main shaft of a reduction mechanism serving as a drive shaft for driving a drive mechanism of an operating rod at a constant circumferential interval on a peripheral surface. Is provided, and a photosensor consisting of a light emitting element and a light receiving element is arranged around it, and light is emitted from the light emitting element to a reflector on the peripheral surface of the rotating disk. The light receiving element receives the reflected light reflected by the collision and sends out the detection signal, and every time the photo sensor sends out the detection signal, an LED lamp consisting of a light emitting diode provided on the outer surface side of the main body is provided. Because it emits light, even if the motor has its own characteristics, the rotation speed of the reduction gear main shaft driven by the motor via the reduction mechanism is picked up, and the LED lamp of each electric syringe assembled The luminous interface Since the valve becomes correctly proportional to the pushing speed of the operating rod by the driving mechanism, the injection speed when the dentist injects the injection solution into the gingival part of the patient using the electric syringe is determined by each electric syringe. Without being affected by the individual differences of the LED lamps, it is possible to visually confirm the light emission intervals of the LED lamps accurately.

[Brief description of the drawings]

FIG. 1 is an overall side view of a conventional electric syringe.

FIG. 2 is a vertical sectional side view of the same.

FIG. 3 is a longitudinal side view of a motorized syringe according to the means of the present invention.

FIG. 4 is a cross-sectional plan view of the electric syringe according to the first embodiment.

FIG. 5 is a partially cutaway side view of a drive mechanism of the operating rod of the electric syringe.

FIG. 6 is an explanatory diagram of releasing means of the driving mechanism of the above.

FIG. 7 is a perspective view of a main part of a means for confirming the injection speed of the injection solution according to the first embodiment;

FIG. 8 is a perspective view of another embodiment of the main part of the checking means.

FIG. 9 is a longitudinal sectional side view of a main part of another embodiment of the checking means.

FIG. 10 is a vertical sectional side view of the turntable of the embodiment.

FIG. 11 is a perspective view of the turntable of the above.

FIG. 12 is a bottom view of the turntable of the above.

[Explanation of symbols]

A: electric syringe, B: confirmation means, D: dial, M: motor, SW1: forward switch, SW2: reverse switch, LSW1: limit switch, LSW2: limit switch, G1-G5 / G10-G13: gear, a ... Body case, b: cartridge holder, c: injection needle, d
... Drive mechanism, e. Cartridge, f. Frame, g .. fulcrum shaft, p .. pinion, r .. rack, 1.
Storage battery, 11 contact, 12 release knob, 2 operating section case, 20 operating rod, 20a projection, 22 opening
200: harpoon section, 4: LED lamp, 5: reduction mechanism, 50
... reduction gear main shaft, 60/61 ... rotating shaft, 62 ... fulcrum shaft,
63 ... frame, 64 ... spring, 65 ... push-in piece, 66 ... release button, 7 ... rotating plate, 7a ... boss portion of rotating plate, 7b ...
Tooth rod, 7c: insertion hole, 70: reflector, 71: concave groove, 72
... black part, 73 ... white part, 74 ... tape, 8 ... photosensor, 80 ... light emitting element, 81 ... light receiving element, 90 ... boss part, 91 ... set screw, 92 ... screw hole, 93 ... reduced diameter part.

Claims (6)

[Claims] 1. A motor M, a driving mechanism d driven by the motor M, and an operating rod 20 that moves in the front-rear direction by the operation of the driving mechanism d. In the electric syringe A in which the injection liquid in the cartridge e loaded in the cartridge holder b mounted on the front end of the operating part case 2 is pushed out, the drive mechanism d is incorporated in the main body a to decelerate. On the reduction gear main shaft 50 of the reduction mechanism 5, there is provided a rotary disk 7 provided with reflectors 70... At predetermined intervals in the circumferential direction on the peripheral surface, and a light emitting element 80 and a light receiving element are provided around the rotary disk 7. The photo sensor 8 including the element 81 is reflected by the light receiving element 81 to receive reflected light emitted from the light projecting element 80 and colliding with the reflector 70 on the peripheral surface of the turntable 7 and reflected. And send it out. A device for confirming the injection speed of an injection solution in an electric syringe, wherein an LED lamp 4 composed of a light emitting diode provided on the outer surface side of the main body a emits light every time the sensor 8 performs a detection operation. 2. A rotation provided on the reduction gear main shaft 50 by using a boss portion of the bevel gear G10 fitted on the reduction gear main shaft 50 and providing a reflector 70 on a peripheral surface thereof at a constant interval in a circumferential direction. The device for confirming an injection speed of an injection solution in an electric syringe according to claim 1, wherein the device is formed on a board (7). 3. A rotating disk 7 provided on a reduction gear main shaft 50,
A tape 74 having a black portion 72 and a white portion 73 printed thereon in a bar code shape at a fixed interval is adhered to the peripheral surface thereof, and the white portion 73. The device for confirming an injection speed of an injection solution in an electric syringe according to claim 1, wherein the device is formed so as to be formed as follows. 4. On the peripheral surface of the rotating disk 7 provided on the reduction gear main shaft 50, concave grooves 71 are formed along the axial direction at regular intervals in the circumferential direction, and a bright color such as white is formed on the bottom surface thereof. 2. A device for confirming the injection speed of an injection solution in an electric syringe according to claim 1, wherein said reflector is formed by applying a paint or attaching a reflector. 5. The rotating disk 7 is fitted to the outer periphery of a boss 90 of a bevel gear G10 mounted on the reduction gear main shaft 50 in advance, and the rotation disk 7 is reduced by assembling the bevel gear G10 to the reduction gear main shaft 50. The device for confirming an injection speed of an injection solution in an electric injector according to claim 1, wherein the device is mounted on a gear main shaft (50). 6. A boss portion 7a of the turntable 7 is fitted around the outer periphery of the boss portion 90 of the bevel gear G10 fitted to the reduction gear main shaft 50, and the lower end of the boss portion 7a of the turntable 7 extends downward. A plurality of toothed rods 7b projecting toward each other are provided at a certain distance in the circumferential direction, and the outer surfaces of the toothed rods 7b are mirror-finished to form reflectors 70. 2. A device for confirming an injection speed of an injection solution in an electric injector according to claim 1, wherein the lower end side of the boss portion 90 of the bevel gear G10 located inside the reflectors 70.