JPS59228850A - 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, face numbers, etc. into the human body using a syringe type infusion pump.

BACKGROUND ART Infusion devices that automatically perform infusion using a syringe pump have been known.

This device is equipped with a syringe pump containing a medicinal solution, and infuses the patient by pressing the syringe's tip with a slider at a constant speed. Currently, there are various capacities of syringes used in such ring liquid devices, such as 1, 5, 10, and 20 degrees and 30.50 mA.

These syringes have a limited length so that they can be held and used as a syringe.
For this reason, the diameter of the syringe is changed depending on the capacity. In the above-mentioned infusion device, in order to inject liquid at the same flow rate when the diameter of the syringe is changed, it is necessary to change the feed speed of the syringe, but if this is done incorrectly, serious consequences may result. Become.

For example, there is a difference of about twice the inner diameter area between a 20ml syringe and a 50ml syringe, so if you accidentally set the feed speed of the 50ml syringe to be the same as that of a 20TL syringe, the injection rate will be about twice as much. If this happens, it will be very dangerous.

The present invention solves the above problems once and for all, and provides an infusion device that detects the diameter of a syringe and automatically sets the feeding speed of the syringe.

FIG. 1 shows the external appearance of the infusion device (11) according to the present invention, in which the case (2) is equipped with an operating section (3) and a pump fR=
(4) is provided. The operation section (3) has a syringe size display section (5), an injection error display section (6), and an end 6
Minute display section (7), driving display section (8), stop display section (
9), digital display section 00), flow rate setting button section u1),
Infusion start button tia.

Stop buttons t+, 3+, fast forward button, elapsed time display button (IE
il, feed amount display <D (1(il and operation button (17)
etc. are arranged. There is a slider Q in the pump mounting part (4).
Al is provided movably along the guide (E trench) and also includes a syringe holding part 121Ji.The syringe (
241 and Naruko (21), the pump head consists of the above-mentioned holding part (
The syringe C! (A) is held and attached to 2 (8), and the above-mentioned suppression part (2) is in contact with the rear end of Naruko (25). A pipe (27) is connected.

In the state shown in Fig. 1, the slider moves at a predetermined speed in the direction of the arrow a, and the cylinder ω is pressed, causing the syringe e to move at a predetermined speed.
The liquid in (a) is pushed out at a predetermined flow rate and is supplied to the patient through a pipe (2η).

Next, an embodiment of a slider (lal drive device) including the present invention will be described with reference to FIG.

This drive device is configured to have the following four functions including the function according to the present invention.

(1) Regardless of the injection speed of the liquid, an alarm is issued a predetermined time before the end of the infusion (6 minutes in the case of FIG. 1).

(2) Always accurately inject a set amount of liquid into the patient.

(3) Monitor whether the liquid is being infused normally during infusion by detecting the pressure within the syringe.

(4) Detect the diameter of the syringe, and adjust the autor according to the detection.
11. Set the liquid injection rate.

In FIG. 2, the slider θa is moved in the direction of the arrow a by a feed screw rotated by a motor, so that the slider θa is fed through a pressing portion rJ21. The above motor C781 is the injection speed setting circuit G
The injection speed generation circuit (
The motor control circuit 04 is controlled by the speed signal Ss output from the motor 31), thereby rotating at a set speed.

Above feed screw (linear potentiometer 0 parallel to 2 rows)
A contact Oa provided on the slider (18) is in contact with this potentiometer (33).Therefore, from this potentiometer 031, the position of the slider, that is, the position of Nariko (c) is indicated. A signal SP1 is obtained.

This signal SPI is applied to the student position detection circuit 051,
This circuit C3ω applies the iron position detection signal SP2 to the 6 minutes before end detection circuit (30 and the injection end detection circuit 07).

0 of the detection circuit calculates the time 3 minutes before the end of injection based on the signal SP2, the signal SR representing the diameter of the syringe Q41 obtained from the syringe diameter detector (21), and the signal S8. When the time comes, a signal S is applied to the alarm signal generating circuit. In response to this, the FF121 path 681 outputs an alarm signal, and by this alarm signal, the display section (7) in FIG. 1 enters the display state to notify that there are 6 minutes before the end. According to the above, the syringe diameter,
Regardless of the injection rate, an alarm can be obtained 6 minutes before the end, and the function of item 11 above can be achieved.

Next, the injection end detection circuit 07) detects that the injection of liquid has ended based on the signal S8 and the signal 8P2, and the signal SE
is added to the alarm signal generation circuit (2). In response to this, this circuit (c) sends a stop signal Ss to the control circuit 0.
T, thereby stopping the motor (28).

According to the above, a constant injection volume can always be given to the patient regardless of the syringe diameter, and the function (2) above can be achieved.

Next, the suppression part that presses Naruko (c) (the second part is the syringe C)
! A pressure sensor (31, j) is provided to detect the fluid pressure in (a). A signal SP□ indicating the pressure obtained from this pressure sensor (39) is sent to the initial value storage circuit (4) and It is added to the pressure conversion circuit 121.The initial value storage circuit (41) stores the pressure value when no liquid is injected at the time of stoppage, and the subsequent pressure conversion circuit (421) calculates the pressure value from this initial pressure value. By subtracting the pressure value during injection, temperature drift, resistance of the syringe (24j, etc.) are canceled out.The pressure conversion circuit (421) also calculates the syringe diameter based on the signal S. The pressure difference due to the difference is converted, the pressure per unit surface of the liquid is determined, and the signal SPs is sent to the comparison circuit (4F).This comparison circuit includes the blockage value generation circuit (44),
Each reference value indicating a pressure abnormality is given from the open value generation circuit (inquiry and abnormal value generation circuit (46)) and compared with the signal SPs.The above-mentioned occlusion value is determined by the load on the motor, such as needle jam, etc. The above-mentioned open value is the reference value when the load on the motor becomes light, such as when the needle is pulled out or the tube is dislodged.The above abnormal value is the reference value when the load changes rapidly. These closed values, open values, and abnormal values are configured to be updated according to the signal S.

The comparison circuit (431) detects each of the above-mentioned abnormal states and applies the eight detection signals to the alarm signal generation circuit. At the same time, send signal 5srt' to motor C.
2: Stop il. According to the above, the infusion state can be constantly monitored and the function (3) can be achieved.

Next, the Hiei circuit (47) receives the signal S1 and classifies the types of syringes with different syringe diameters. That is, A syringe, B syringe, and C syringe are l'l'? Comparing the different voltages A, B, O and the signal S8, respectively, ? Outputs another name (SJ) to '. The speed of the motor C'81 is controlled based on the injection speed set in the motor control circuit (in March, this signal SD and the injection speed setting circuit 0).
The upper signal SD is added to the storage circuit (4→ and stored as the size of the syringe currently being used. This stored syringe size and signal S8 are added to the syringe detection circuit 09) for comparison. be done. As a result, when the syringe (24) is removed or accidentally replaced with a syringe of another size, a detection signal S is output and added to the alarm signal generation circuit O!IO. is completed, and the motor C2F1l is stopped. According to the above, the diameter of the syringe is automatically detected to determine the speed of the motor (21'D), and it is also possible to detect incorrect attachment of the syringe. , the function of item (4) above can be achieved.

The alarm signal generating circuit □□□ outputs alarm signals having various contents, and it goes without saying that the display state of the alarm by sound, light, etc. may be changed depending on the contents. Further, each circuit in FIG. 2 can be constructed with a digital circuit, and a pulse motor may be used as the rough motor (2!g).

Next, an embodiment of the pressure sensor (39) will be described with reference to FIG.

In FIG. 6, a frame (50) is provided inside the slider holder, and an opening 6υ at one end of the frame 60 is provided with the pressing portion (2 hot water) made of Delrin resin or the like through a backing 62. A plate spring (53j) made of stainless steel or the like is further provided at the end of this frame, and a pair of strain gauges 54J and 05J are provided on this plate spring (53j). A protrusion (56) is buried therein, and the tip of the protrusion 56J is in contact with approximately the center of the leaf spring 6.

According to the above statement, when slider 0→ moves in the direction of arrow a and presses 11S (221 presses student (c),
The protrusion (5Gl) presses the leaf spring (531), and the amount of deflection is converted into voltage by the strain gauges (54) (55) to obtain the signal SP□.

Next, an embodiment of the syringe diameter detector will be described with reference to FIG.

In the figure, a pair of rotating arms 69) (FIG.) each provided with a detector (57) and an OJ (see FIG. 1) have their lower portions fixed to a rotating axis Gυ; These rotation axes fJ
Gears ((33) (6+r) are fixed to it- in mesh with each other. These rotating arms 69)- are attached by spring haze in the direction in which the pair of capsules s7j #81 approach each other. A magnet (ee) is glued to one end of one rotating arm 59), and a magnetic field detection element (such as a ball element) is attached close to this magnet (61i).
67) are fixedly arranged.

According to the above configuration, when the syringes (24) with different diameters are attached to the syringe attachment part (4) as shown by the virtual lines, the detector e5? ) The ff18+ contacts one part of both plates of the syringe (24) as shown in the virtual glands of Chang and Norihe. In other words, the rotation angle of the arm (!i9) (GO) differs depending on the syringe diameter, which causes the magnet (G
The detection element (the position relative to 6'θ changes, and the detection element ?) outputs the 1E pressure corresponding to the syringe diameter as the signal SR. Number 51 shows the output characteristics of the Hall element, in which linear characteristics are obtained in the range of S, and for example, the outputs shown in the figure are obtained for each of the A, B, and O syringes.

As described above, the present invention detects the diameter of the syringe,
In addition to memorizing this, the memorized syringe diameter is compared with the currently detected syringe size, so if a syringe of the wrong size is attached or the syringe has fallen off. In some cases, this can be reliably detected and the safety of infusion can be improved.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention, and FIG. 1 is an external perspective view of an infusion device, FIG. 2 is a block diagram of an actuation device,
FIG. 6 is a sectional front view of the main part of the pressure sensor, FIG. 4 is a sectional front view of the main part of the syringe diameter detector, and FIG. 5 is an output characteristic diagram of the Hall element. In addition, in the symbols used in the drawings, (18)・・・・・・・・・・・・Slider CD
・・・・・・・・・・・・・・・Syringe diameter detector (2
4・・・・・・・・・・・・Press part (24)...
・・・・・・・・・・・・Syringe (25)・・・・
・・・・・・・・・・・・My child06）・・・・・・・・・
・・・・・・Pump (48)・・・・・・・・・−・・
...Memory circuit (49)...
- Syringe detection circuit. Agents Masaru Ueya Yoshio Tsunekako Toshiki Sugi Waku

Claims (1)

[Claims] In an apparatus that performs infusion by pressing and moving a syringe-type pump element with a slider, the apparatus comprises: a means for detecting a syringe diameter; a means for storing a detected value of the detecting means; An infusion device characterized by being provided with a means for comparing the current detected value obtained from the infusion device.