JPS62197068A - Apparatus for displaying falling speed of drip liquid - 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 (Field of Industrial Application) The present invention relates to a falling speed display device for intravenous fluid in an intravenous drip device used in hospitals and the like.

(Prior Art and Problems) Since an intravenous drip device has the function of injecting medicine or blood into a patient's body, it is extremely important to accurately know the falling speed of the intravenous fluid.

However, until now, no suitable device has been provided for accurately measuring and displaying the falling speed of the intravenous fluid in such intravenous devices, and the reality is that this has been done solely by direct observation with the naked eye of doctors and nurses. It is. For this reason, it depends entirely on feel, and there is a need for a device that can accurately and easily determine the falling speed of the intravenous fluid.

(Means for Solving the Problems) The present invention aims to provide a falling speed display device for intravenous fluid that meets such demands, and can be achieved by the device configuration shown below.

In other words, the falling speed display device l according to the present invention (Fig. 1)
A holding frame part 3 that holds the liquid volume measuring tube 2 of the drip device, a light sensor part 4 provided in the holding frame part 3 so that the light path on the trajectory of the droplet intersects, and a light sensor part 4 of the light sensor part 4 are installed. According to the best embodiment of the present invention, the present invention is characterized by comprising a main body section 5 that calculates the falling speed of the drip from the output, and a display section 6 that displays the falling speed based on the output of the main body section 5. The falling speed is expressed as the number of drops falling per minute.

(effect) Next, the operation of the present invention will be explained.

First, each time the drip drops in the liquid volume measuring tube 2, it crosses the optical path of the optical sensor section 4, so that the output of the optical sensor section 4 obtains a signal corresponding to (synchronized with) the falling time of the drip.

In this way, from the output of the optical sensor unit 4, the drip interval time T
In order to obtain i, the main body 5 can easily calculate, for example, the number of infusions per minute.

Then, the calculated number of infusions per minute is displayed externally by the display unit 6.

(Example) Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

First, in order to clarify the present invention, the external structure of a falling speed display device 1 according to the present invention will be explained with reference to FIG. This figure is an external front view of the device.

5 is a main body portion, which is covered with an external cover 10. A display panel section 11 is provided on the front surface 10a of the external cover 10,
This panel section 11 includes a display section 6 that uses a fluorescent display tube, liquid crystal display, or other display device for digitally displaying two-digit numbers. In addition, the panel section 11 includes an indicator light 12 such as a light emitting diode that lights up when the power is turned on, an indicator light 13 that lights up when the intravenous fluid runs out, and an indicator light 13 that lights up when the liquid level detection element in the liquid level measuring tube 2 has deteriorated. An indicator light 14 is provided.

On the other hand, on the front surface 10a other than the panel part 11, there is a liquid volume measuring tube 2.
A surface detection sensitivity adjustment knob 15 and a drop detection sensitivity adjustment knob 16 are provided.

On the other hand, a holding frame part 3 for holding the liquid volume measuring tube 2 of the drip device is integrally provided on the side surface of the main body part 5.

In FIG. 1, reference numeral 17 indicates a connector to be connected to an infusion completion reporting device placed at a remote location, and reference numeral 18 indicates a power plug.

Next, the holding frame portion 3 will be explained with reference to FIG.

This figure is a longitudinal sectional view of the holding frame.

First, 2 indicates the liquid volume measuring tube of the dripping device. Liquid volume measuring tube 2
is formed in the shape of a cylindrical container, and liquid feeding tubes 19 and 20 are connected to the upper and lower ends, respectively. In particular, the tube 19 at the upper end is slightly protruded inward to function as a nozzle 21. Further, 22 is a flange integrally provided at the upper end.

In such a liquid amount measuring tube 2, a droplet falls from the nozzle 21 one by one, and the liquid is stored up to a reference liquid level line provided in the middle part.

Next, the holding frame portion 3 has a holding hole 23 extending in the vertical direction and locking and holding the liquid amount measuring tube 2 inserted from above into the hollow shaft. The diameter of the holding hole 23 is selected to be slightly larger than that of the liquid volume measuring tube 2, so that the flange 22 of the liquid volume measuring tube 2 is engaged at the upper end, and a small diameter portion is formed at the lower end. As a result, the holding frame 3 has a holding function of positioning and holding the liquid volume measuring tube 2, and also has a function of covering the periphery of the liquid measuring tube 2 and having a light shielding function for the intermediate tube 2.

On the other hand, a recess 24 is provided in the inner wall of the holding hole 23 in the holding frame 3, and the liquid is inserted into the recess 24 around the liquid level measuring tube 2 and above the reference liquid level line. Light-emitting elements such as light-emitting diodes arranged 180 degrees opposite 25.26
A light sensor section 29.30 consisting of a light receiving element 27.28 such as a phototransistor is provided.

In the optical sensor sections 29 and 30, the lower optical sensor section 29
is arranged on the reference liquid level line, and the upper optical sensor section 30 is provided at the midpoint between the reference liquid level line and the nozzle 21.

The intermediate point is set at a position where the falling drip completely separates from the nozzle 21 and becomes granular. Thereby, in particular, the optical path from the light emitting element 26 to the light receiving element 28 in the optical sensor section 30 intersects with the locus of the drip falling from the nozzle 21 .

The functions of the optical sensor section 29, 30 configured in this way will be explained with reference to FIGS. 3 to 6.

3 to 6 are schematic front views of the optical sensor section and the liquid volume measuring tube, respectively.

First, as shown in FIG. 3, when there is no falling drip, the upper optical sensor section 30 receives the light from the light-emitting element 26 as it is at the light-receiving element 28 and enters the light-receiving state, but as shown in FIG. When the W falls, the light from the light emitting element 26 is interrupted midway, so the light receiving element 28 enters a non-light receiving state and detects the presence or absence of the drip.

On the other hand, in the lower optical sensor section 29, when the liquid in the container is accumulated above or above the reference liquid level line as shown in FIG. 5, the light receiving element 27 is in a non-light receiving state. As shown in FIG. 6, when the liquid drops below the reference liquid level line, it enters a light receiving state and detects the liquid level.

Next, the main body portion 5 will be explained with reference to FIGS. 7 and 8. Figure 7 is a block circuit diagram of the electrical system of the main body.
FIG. 8 shows a timing chart of signals at various parts in FIG. 7.

First, in the block circuit of the main body 5, 50 is a clock pulse signal generation circuit, 51 is a frequency dividing circuit, 52 is a period counter, 53 is a gate circuit, 54 is a pulse synchronizer, 55 is a reset circuit, 56 is a divider, 57 is a latch circuit, 58 is a counter, 59 is a decoder, 60 is a driver, 61 is a power switch ON detection circuit, and 62 is a display (display section 6).

Next, the operational functions of the main body section 5 will be explained according to the timing chart of FIG. 8. It should be noted that the same signals are given the same reference numerals in each reference numeral in the timing chart of the figure and the reference numerals of each part in FIG.

First, Sl is a droplet signal, and one fl1 of pulses P1 is generated every time one drip falls.

The input of each pulse P1 is directly displayed by the indicator lamp 63 of the indicator 62 via the driver 60.

Further, in the pulse synchronizer 52, the pulse PL
As a result of the input of the clock pulse signal 32 (69,3411z) from the frequency dividing circuit 51 immediately after that, the inverted pulse is inverted (rises) at the rising edge of the clock pulse signal S2) P2
Output.

This inverted pulse P2 is quantized by a frequency-divided clock pulse signal Ql (142 KHz) via a gate circuit 53, and the quantized signal QS is applied to a divider 56.

On the other hand, as the inverted pulse P2 output from the pulse synchronizer 54 rises, the latch circuit 54 outputs a latch pulse P3, and the reset circuit 55 outputs a reset pulse P4. In this reset pulse P4, the time Tm between each pulse approximately matches the falling time interval of the drip, and this time Tm is the frequency-divided clock signal Q2 (
34,67 Hz) is counted by the period counter 52. The needle value M obtained by the counter 52 and the quantized signal QS are subjected to a calculation process of QS/M by a divider 56. Therefore, the output signal s5 of the divider 56 matches the number of drips per minute (drip rate). This output signal S5 is counted by a counter 58 and displayed on a display 62 via a deducer 59. Note that the launch signal S3
Therefore, the decoder 59 holds data in infusion interval units.

In addition, when the synchronization counter 52 is overcounted (when the number of drips is 2 or less per minute), the display 62 is turned off, and when the counter 58 is also counted over (when the number of drips is 1000 or more per minute), the display 62 is turned off. The display 62 is turned off.

With such a circuit configuration, the display range is 3 to 99 times/min, and the display error is ±2.5%rdg±ldigit. Note that the display error characteristics are shown in FIG.

Although the embodiments have been described in detail above, the present invention is not limited to these embodiments. For example, the other optical sensor section 29 detects whether or not the infusion has ended, and activates, for example, an infusion completion reporting device. Furthermore, the design of the block circuit of the main body 5 can be arbitrarily changed (for example, using a microcomputer, etc.), and the display method can be either digital or analog. Any changes may be made without deviating from the gist of the document.

(Effects of the Invention) As described above, the intravenous liquid falling speed display device according to the present invention uses an optical sensor to detect the falling speed of the intravenous drip from the liquid volume measuring tube of the intravenous device, and displays it numerically. As a result, the following benefits will be obtained:

■ Conventionally, the drip speed depended on the intuition of doctors, etc., but since this device automatically measures and displays the drop speed, it is extremely easy to know objective and accurate drip speed.

- Detection is performed using an optical sensor attached to the liquid volume measuring tube, so it is highly accurate and can be manufactured with a simple circuit configuration, providing high reliability and being available at low cost.

[Brief explanation of drawings]

FIG. 1 is an external front view of a falling speed display device according to the present invention;
Figure 2 is a longitudinal cross-sectional view of the holding frame in Figure 1, Figures 3 to 6 are schematic front views of the optical sensor unit and liquid volume measuring tube, respectively, and Figure 7 is a block diagram of the electrical system of the main body of the device. A circuit diagram, FIG. 8 is a timing chart of signals in the inner part of FIG. 7, and FIG. 9 is a graph showing display error characteristics. In addition, in the drawing, ■... Intravenous drop rate display device, 2...
Liquid volume measuring tube of dripping device, 3... Holding frame section, 4... Optical sensor section, 5... Main body section, 6... Display section. Figure 2 Figure 3 Figure 4 2 No. 7 2 No. 8 g Procedural Amendment May 21, 1986 Director General of the Patent Office Michibu Uga 1, Indication of $ 1986 Patent Application No. 38471 2, Invention Name of intravenous liquid falling speed display device 3, relationship with the case of the person making the amendment Patent applicant 4, agent

Claims (1)

[Scope of Claims] 1. A holding frame portion that holds a liquid volume measuring tube of an intravenous drip device, an optical sensor portion provided on the holding frame portion so that an optical path intersects with the locus of the falling drip, and A falling speed display device for an intravenous liquid, comprising: a main body that calculates and processes the falling speed of a liquid drip output from a sensor; and a display unit that displays the falling speed based on the output of the main body. 2. The falling speed display device of claim 1, wherein the displayed falling speed is the number of drips falling per minute.