JPH10192400A - Transfusion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent malfunctions by external noise by providing a mechanical reverse rotation prevention device between an electric motor rotary shaft and a feed screw. SOLUTION: A small gear 7 is fixed to the rotary shaft of an electric motor 6 and is engaged with a large gear 8 mounted to the feed screw 5 through a unidirectional clutch 9. A parallelly movably provided slider 3 engaged with the feed screw 5 is engaged with the end part of a sucker 2. By the constitution, when the electric motor 6 is driven in a prescribed direction, the unidirectional clutch 9 is operated in a transmission direction, the feed screw 5 is rotated and the slider 3 is operated so as to make the sucker 2 push transfusion in a discharging direction. However, when the driving electric motor 6 is reversely rotated by the cause of some external noise, the unidirectional clutch 9 is slid and rotation is not transmitted to the feed screw 5. Thus, the reverse movement of the sucker 2 by the slider 3 is not present. In such a manner, the malfunction by the external noise is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an infusion device,
In particular, the present invention relates to a drive mechanism of an infusion device for injecting a medical solution, blood, and the like into a human body by moving a syringe of a syringe by rotation of a motor.

[0002]

2. Description of the Related Art Conventionally, there has been known an apparatus for automatically performing infusion by moving a suction tube of a syringe by rotation of an electric motor. In this type of infusion device, there is a strict regulation that the sucker must never move in the opposite direction (suction) to the direction in which the sucker is pushed out. And the processing is performed such that the rotation direction is only one of the driving programs and the electric circuit.

[0003]

With the recent development of electronic technology, electrical equipment that emits various kinds of transmission noises (electromagnetic waves) has been widely used in medical practice, and the problem of malfunction due to noise has increased.

[0004]

An infusion device according to the present invention has a feed screw driven by a prime mover, and presses a sucker of a syringe with a linearly movable slider engaged with the feed screw to transfer liquid. In the infusion device for sending out, a means for transmitting a driving force only in a direction of pressing the syringe is provided between an output shaft of the motor and a feed screw.

[0005]

In the construction of the infusion device according to the present invention, a mechanical reverse rotation preventing device is provided between the rotating shaft of the electric motor and the feed screw. There is no reversal and there is no danger of malfunction.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing one embodiment of an infusion device according to the present invention. In FIG. 1, reference numeral 1 denotes a syringe, 2 denotes a syringe sucker, 3 denotes a slider which engages with a feed screw 5 and presses the sucker 2, 5 is a feed screw, 6 is a drive motor, 7 is a small gear fixed to the motor shaft, 8 is a large gear that meshes with the small gear, 9 is a one-way clutch, and 10 is a housing.

The construction of the infusion device according to the present invention shown in FIG. 1 is such that a syringe 1 having the above-mentioned sucker 2 is fixed to a predetermined place of a housing 10,
A feed screw 5 parallel to the outer cylinder 1 of the syringe and an electric motor 6 for driving the feed screw 5 are fixed to each other, and a small gear 7 fixed to a rotation shaft of the electric motor 6 and a feed screw 5 A large gear 8 mounted via a directional clutch 9 is engaged with the slider, and a slider 3 which is engaged with the feed screw 5 and is provided so as to be movable in parallel is provided in engagement with the end of the sucker 2. . The one-way clutch used in the present invention is, for example, as shown in FIG.
And a plurality of triangular grooves 19 formed on the outer periphery of the cylindrical body 18.
And, the inner peripheral surface is brought into contact with the outer peripheral surface of the cylindrical body 18,
An outer cylinder 20 whose outer periphery is fixed to the large gear 8;
A conventionally known one comprising an inner peripheral surface of a zero and a ball 21 inserted in a space formed between the triangular grooves 19 is used.

In the infusion device according to the present invention shown in FIG. 1, when the electric motor 6 is driven in a predetermined direction (for example, clockwise rotation), the one-way clutch 9 operates in the transmission direction and the rotation of the electric motor 6 is controlled by the feed screw 5. Is rotated so as to push the slider 3 in the direction in which the sucker 2 discharges the infusion, whereby the infusion device operates properly. Next, when the drive motor 6 is rotated in the reverse direction (for example, counterclockwise rotation) for some reason,
Since the one-way clutch 9 acts in the sliding direction and the rotation of the electric motor 6 is not transmitted to the feed screw 5, there is no erroneous operation that the slider 2 moves the sucker 2 in the reverse direction (suction direction).

[0009]

As described above, the infusion device according to the present invention has an excellent function that can completely prevent a malfunction in which the sucker operates in the reverse direction even if the motor is reversed due to various kinds of electric noises, etc. Can be realized with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of an infusion device according to the present invention.

FIG. 2 is a sectional view of a one-way clutch used in the infusion device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Syringe 2 Syringe sucker 3 Slider 5 Feed screw 6 Drive motor 7 Small gear fixed to motor shaft 8 Large gear 9 One-way clutch 10 Housing 18 Cylindrical body 19 Triangular groove 20 Outer cylinder 21 Ball

Claims (2)

[Claims] An infusion device having a feed screw driven by a prime mover, wherein the liquid is delivered by pressing a syringe sucker by a linearly movable slider engaged with the feed screw.
An infusion device comprising means for transmitting a driving force only in a direction of pressing a syringe between an output shaft of the motor and a feed screw. 2. The infusion device according to claim 1, wherein the means for transmitting the driving force is a one-way clutch.