JPH0542213A - Transfusion equipment - Google Patents

Abstract

PURPOSE:To improve reliability by moving a slider with a feed screw to press sucker and by detecting its press force at one end side of the feed screw in transfusion equipment such as chemicals using a syringe. CONSTITUTION:The driving means 25 of a slider 24 comprises a feed screw 34 rotating at position by a motor and a driven member 32 engaged with the feed screw 34. The slider 24 is connected to the driven member 32 by a connecting member 30. In addition, one end 34a of the feed screw 34 is abutted to a detection means 40 through a hard ball 53 to detect press force for pressing sucker. A large toothed gear 41 is mounted on the other end of the feed screw 34 to engage and interlock with a small toothed gear at the motor side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infusion device for injecting various chemicals, blood, etc. into a human body using a syringe.

[0002]

2. Description of the Related Art Conventionally, an infusion device is known in which an infusion is automatically performed using a syringe. In this type of device, a syringe containing a drug solution is mounted, and a sucker of the syringe is pressed at a constant speed by a slider to perform infusion.

In such an infusion device, it is necessary to strictly monitor whether or not the drug solution or the like is reliably injected into the body during the infusion. Therefore, in the conventional infusion device of this type, for example, a load such as a motor for driving the slider for moving the sucker is detected, or a pressure sensor or the like is provided in a portion of the slider that presses the sucker. Thus, there is provided an infusion device which monitors the pressure when the medicinal solution is infused into a patient and discriminates whether or not the medicinal solution or the like is reliably infused into the body during infusion. For example,
An example thereof is disclosed in Japanese Examined Patent Publication No. 62-44505.

[0004]

However, when the injection state of the chemical liquid or the like is monitored by detecting the load of the motor, the slider is driven through the gear, so that the detection error is large and the reproducibility is poor. It was a thing. Further, when a pressure sensor or the like is provided in the portion of the slider that presses the sucker, the reaction force when the slider presses the sucker can be directly detected, so the detection error is small and the reproducibility is excellent. However, since a pressure sensor or the like is provided on the moving slider, there is a problem that a drip-proof structure must be provided so as not to break the lead wire that is routed around and to prevent the pressure sensor and the like from being contaminated.

The present invention solves the above-mentioned drawbacks of the infusion device, can reliably identify whether or not the liquid medicine or the like in the infusion liquid has been injected into the body, and has a simple structure and high reliability. It is intended to provide an infusion device.

[0006]

The infusion device according to the present invention is a transfusion device in which a slider provided movably is brought into contact with the sucker of a syringe, and the slider is moved to press the sucker. As a drive means for moving the slider, a feed screw rotating at a substantially constant position is provided, and a contact pressure for moving the slider by the drive means to press the sucker is provided on one end side of the feed screw. The detection means is used for detection.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the infusion device according to the present invention will be described below with reference to the drawings. FIG. 1 shows an external view of an infusion device according to an embodiment of the present invention. The case 2 of the infusion device 1 is provided with an operation section 4 for monitoring the infusion operation and infusion state of the syringe 3, and a pump mounting section 5 to which the syringe 3 can be attached. As the syringe 3, a standard product having a total capacity of 10 ml, 20 ml, 30 ml, 50 ml or the like is used depending on the application.

Further, the operation unit 4 has a capacity display 6 for displaying the capacity of the syringe 3 mounted therein, a centralized display 7 for displaying various operating states, an infusion start display 8, and an infusion stop display. A device 9 and a 4-digit numerical display device 10 for displaying the flow rate during infusion and the cumulative flow rate in ml / hour or ml are arranged.

The centralized indicator 7 is provided with various indicators for indicating the operating state of the infusion device, and the operation section 4 is also provided.
Includes a one-shot button 11 capable of sending a larger amount of liquid medicine than an ordinary liquid supply in an emergency, an infusion amount button 12 for selecting the displayed contents of the numerical display 10, and an infusion start / stop button 1.
3, a fast-forward button 14, a buzzer stop button 17, and a power button 15 are arranged. Furthermore, a flow rate setting button 16 is provided above and below the numerical display 10 so that the flow rate can be set for each digit.

The pump mounting portion 5 is an outer cylinder 21 of the syringe 3.
And a slider 24 that can press the sucker 23 that slidably moves in the syringe 3. The slider 24 is movably supported by a part of driving means covered with a bellows 29.

The outer cylinder 21 of the syringe 3 is held by the holding portion 26, and the rear end of the sucker 23 is brought into contact with the slider 24.
A flexible infusion pipe (not shown) communicating with the injection needle is connected to the tip of the syringe 3. Therefore, when the syringe 3 is mounted on the mounting portion 22 and the slider 24 is pressed by the driving means in the direction of the arrow a at the predetermined speed by the slider 24, the drug solution in the syringe 3 is pushed out at a predetermined flow rate, and the infusion pipe. And injected into the patient via a needle.

FIG. 2 shows a drive means 25 for the slider 24,
Detecting means 4 for detecting the pressure when the liquid medicine is injected into the patient
Indicates 0. The driving means 25 is composed of a feed screw 34 which is rotationally driven by a motor and a driven member 32 which engages with the feed screw 34, and the slider 24 is connected to the driven member 32 by a connecting member 30. Although not shown in detail, it is possible to manually move the slider 24 by operating the release button 28 attached to the slider 24 to release the engagement between the feed screw 34 and the driven member 32.

On the other hand, one end 34a of the feed screw 34 abuts on the detecting means 40 via a hard ball 53, and a large gear 41 is attached to the other end to mesh with a small gear (not shown) on the motor side. To do.

The slider 24 is moved by a feed screw 34 which is rotationally driven based on a set flow rate, and pushes the sucker 23 of the syringe 3 in the direction of arrow a to push out a predetermined amount of chemical solution. The reaction force of the slider 24 pressing the sucker 23 is transmitted through the connecting member 30 and the driven member 32 to the feed screw 3
4, the detection means 40 electrically converts the reaction force and outputs it as a pressure signal.

The infusion device 1 judges the infusion state based on the pressure signal output from the detecting means 40 and controls the infusion stop and the like.

FIG. 3 shows the details of the detecting means 40. The detection means 40 includes a frame 50 having an opening 51 on one side, a plate spring 52 held in the frame 50, and a pair of strain gauges 54 and 55 attached to the plate spring 52. As shown in FIG. 2, when the reaction force of the slider 24 pressing the sucker 23 is transmitted to the feed screw 34 through the connecting member 30 and the driven member 32, the feed screw 34 is moved by the arrow as shown in FIG. The ball 53 at one end 34a is biased in the b direction.
The leaf spring 52 to which the strain gauges 54 and 55 are attached is pressed via the. As shown by the alternate long and short dash line in FIG.
The leaf spring 52 is deformed by the feed screw 34 biased in the direction via the ball 53 at the one end 34a. This leaf spring 52
The strain gauges 54 and 55 output pressure signals due to the deformation of.

FIG. 4 shows a modification of the detecting means 40. Leaf spring 52 with strain gauges 54 and 55 attached
May be attached to the holding portion 61, the pressing means 60 having the pressing portion 60a may be provided near the one end 34a of the feed screw 34, and the leaf spring 52 held by the holding portion 61 may be pressed by the pressing portion 60a. This is effective when the detecting means 40 does not project in the length direction of the feed screw 34 and is restricted in the length direction of the feed screw 34.

The infusion device according to the present invention can take various forms without being limited to the above-mentioned embodiments. For example, the slider may be directly engaged with the feed screw, and the detection means is not limited to the leaf spring and the pair of strain gauges.

[0019]

In the infusion device according to the present invention, the contact pressure with which the slider presses the sucker is detected by the detection means provided at one end of the feed screw, so that mechanical adjustment is unnecessary. Further, since the detecting means is fixed, there is no disconnection accident due to movement of the wiring, and the reliability is high. Further, since the detecting means is not attached to the slider, the slider structure is simplified and the assembly is facilitated. Further, since the absolute reference value is electrically set, the detection accuracy is high and the reproducibility is excellent.

[Brief description of drawings]

FIG. 1 is an external perspective view of an infusion device according to an embodiment of the present invention.

FIG. 2 is a side view of the infusion device of FIG. 1 with a part thereof cut away.

FIG. 3 is an enlarged cross-sectional view of an embodiment of a detection means that is a main part of the present invention.

FIG. 4 is an enlarged cross-sectional view showing a modified example of the detection means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Infusion device 3 Syringe 23 Sucker 24 Slider 25 Driving means 34 Feed screw 40 Detecting means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Matsubara 3-18-15 Hongo, Bunkyo-ku, Tokyo Atom Co., Ltd.

Claims (1)

[Claims] 1. An infusion device in which a slider provided movably is brought into contact with a sucker of a syringe to press the sucker by the movement of the slider, as a driving means for moving the slider, An infusion device including a feed screw that rotates at a substantially constant position, and the contact pressure that presses the sucker when the slider moves by the drive unit is detected by a detection unit provided at one end of the feed screw. .