JPS59225067A - Transfusion apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an infusion device for injecting various medicinal solutions, blood, etc. into a human body using a single-finger infusion pump.

In such an infusion device, it is necessary to strictly monitor whether or not the liquid is being reliably injected during the infusion. If this is not done, it may be overlooked that the injection is not performed due to needle clogging, bending or dislocation of the fluid replacement tube, etc., and there is a risk that blood will flow backwards or the like. Furthermore, if the needle enters outside the blood vessel due to patient movement, adverse effects such as floating knee may occur. Furthermore, if the tube cracks, the liquid will leak outside. Furthermore, if the holding plate, which is opened and closed in a door manner and is used to press the tube against the finger, is accidentally opened, an excessive amount of liquid will flow.

Conventional devices are equipped with two detectors to monitor the state of the infusion: a detector that detects expansion and displacement of the tube due to abnormal occlusion of the tube, and a detector that detects the release of the number of pressers. . However, this method has the problem that even if the tube is not attached to the tube occlusion detector by mistake, no abnormality will be detected as long as the holding plate is closed. Furthermore, since these two detectors are expensive, only a detector for detecting occlusion is often provided, which leads to a lack of safety.

The present invention provides an infusion device that solves the above problems, and embodiments of the present invention will be described below with reference to the drawings.

In the figure, an infusion tube (II) is held between a presser member (3) and a finger (4) provided on a presser plate (2), and the finger (4) is rotated by a motor (5), so that the infusion tube (II) is is configured to flow in the direction of arrow C.The holding plate (2) is installed so that it can be opened and closed like a door, and when closed in the direction of arrow a, the tube (
Press 11, open it in the direction of the arrow, and release the pressure.

Further, this presser plate (2) is biased in the direction a by a spring (7) interposed between it and the substrate (6) to obtain the above-mentioned pressing force. A presser member (8) is provided at the lower part of the presser plate (2), and a pressure detector (9) such as a strain gauge is fixedly arranged in close opposition to the presser member (8). By suppressing and holding the tube (2) between the holding member (8) and the pressure detector (9) as shown in the figure, the pressure of the liquid pushed out by the finger (4) is detected.

The signal SP indicating the detected pressure value is transmitted through the amplifier 4 to the comparator circuit υ and the initial value storage circuit (121), which increases the output, and injects from this initial pressure value in the subsequent arithmetic circuit (3). By subtracting the pressure value when the pressure is present, temperature drift etc. are canceled out and only the true pressure increase is obtained.The signal 8P8 indicating the above pressure increase obtained by this arithmetic circuit OJ is compared. Circuit 04
). This comparison circuit includes an occlusion 11I generating circuit Uω, an open value generating circuit αe, and an abnormal value generating circuit A, each of which has a reference value S1. S2. S and are respectively compared with the signal SP8. The above-mentioned occlusion value S1 is a reference value when the load on the motor becomes heavy, such as due to a needle jam, and the above-mentioned open value S2 is a reference value when the load on the motor becomes light, such as when a needle comes out, a tube is dislodged, etc. It is.

Further, the abnormal value S5 is a reference value when the load changes rapidly.

The above comparison circuit ((old) detects each of the above abnormal conditions and applies the detection signal SA to the alarm generation circuit α.
8) displays a display according to the abnormal state on a display unit (not shown) and sends a signal Ss to the motor drive circuit a9 to stop the motor (5). According to the above, the state of the infusion can be constantly monitored.

On the other hand, the comparison circuit (II) compares the signal SP with the signal S4 obtained from the presser plate opening value generation circuit (20). This signal S4 is a signal indicating the pressure value inside the tube (2) when the presser plate (2) is opened in the direction indicated by the arrow.

The above comparison circuit 0υ applies the detection signal SB to the alarm generation circuit 08) when the signal SP becomes less than the signal 84.
This circuit marked a indicates that the presser plate (2) is released on the display, and also sends the signal Ss to the motor drive! The signal is sent to the output circuit 09 to stop the motor (5). According to the above, it is possible to reliably detect when the presser plate (2) is opened at the start of infusion, or when the presser plate (2) is erroneously opened during infusion. According to this embodiment, it is possible to detect two types of abnormal states, the above-mentioned abnormal state detection and the opening detection of the presser plate (2), with one pressure eater (9). .

As described above, the present invention provides a finger infusion device with a detector for detecting the pressure inside the infusion tube near the position where the infusion tube of the holding plate passes through the finger, and The detected value is compared with a reference value indicating an abnormal state of the infusion, and the detected value is compared with a reference value indicating that the presser plate is not in the predetermined position.

Therefore, according to the present invention, abnormalities such as needle dropouts and needle jams during infusion and the fact that the presser plate is erroneously opened can be detected.
Accurate detection can be performed using one detector, and infusion can always be performed safely.

[Brief explanation of the drawing]

The drawing is a block diagram showing an embodiment of the invention. In addition, in the symbols used in the drawings, (11...... Infusion tube (
2)・・・・・・・・・・・・・・・Press plate (4)・・
・・・・・・・・・・・・Finger (9)・・・・
......Pressure detector fllX14)...
・・・・・・・・Comparison circuit (I5)・・・・・・・
......Open value generation circuit 06)...
−・・・・・・Occupation value generation circuit (17)・・・・・・
......Abnormal value generation circuit 1'iv)...
......This is a presser plate release value generation circuit. Agent Katsu I Ueya, Yoshio Tsune, Toshihiro Sugiura

Claims (1)

[Claims] In an infusion device in which an infusion tube is held between a presser plate and a finger arranged at a predetermined position, pressure inside the infusion tube is detected near a position of the presser plate where the infusion tube passes through the finger. A detector is provided, and the detected value obtained by this detector is compared with a reference value indicating an abnormal state of the infusion, and the detected value is compared with a reference value indicating that the presser plate is not in the predetermined position. An infusion device characterized by: