CN112386258A

CN112386258A - Low-power consumption automatic monitoring device for urine volume of patient

Info

Publication number: CN112386258A
Application number: CN201910740827.9A
Authority: CN
Inventors: 高鹏; 杨运森; 刘鹏; 苏红森
Original assignee: 924th Hospital of the Joint Logistics Support Force of PLA
Current assignee: 924th Hospital of the Joint Logistics Support Force of PLA
Priority date: 2019-08-12
Filing date: 2019-08-12
Publication date: 2021-02-23

Abstract

The invention provides a low-power consumption automatic monitoring device for the urine volume of a patient, belonging to the field of automatic monitoring of the urine volume of the patient. The invention adopts a divide-and-conquer mode, the urine of the patient is divided into unit volumes and then counted, the product of the counting value and the unit volume is the urine volume of the patient, and then the urine volume and the urine flow rate per hour are calculated to be displayed, stored and sent. The invention adopts a low-power consumption design, monitors the urine volume of a patient accurately, stably and conveniently, and overcomes the influence of urine density, urine speed and change of the position of a urine bag on the urine volume monitoring.

Description

Low-power consumption automatic monitoring device for urine volume of patient

Technical Field

The application belongs to the field of design of automatic urine volume monitoring devices for patients, and particularly relates to an automatic urine volume monitoring device for a low-power-consumption patient.

Background

The urine flow can not only directly reflect the conditions of renal perfusion and renal function, but also indirectly reflect the hemodynamic state of an organism, is one of effective indexes for evaluating the circulating blood volume, the cardiac function state and the microcirculation perfusion, and is also an important physiological index for early identification of fluid resuscitation and acute renal injury. The urine flow rate indexes commonly used in clinic are urine flow rate per minute, urine flow rate per hour, urine flow rate at 24 hours and urine flow rate at 48 hours. The accurate measurement of the urine flow has important significance for mastering the illness state of a patient, adjusting a treatment scheme in due time and judging the outcome and the prognosis of the illness state, and can also greatly reduce the workload of clinical nursing personnel. In recent years, research on automatic urine flow monitoring is more and more, and several automatic urine flow monitoring devices are on the market, but the current clinical automatic urine flow monitoring devices are not widely applied, and measurement is still carried out in a manual mode of using a large number of measuring cylinders, primary and secondary urine bags and the like. The main methods and disadvantages adopted by the existing automatic urine flow monitoring equipment are as follows.

1. Drop number measurement: the urine flow is converted into urine drops by calibrating the volume of the urine drops, and the urine drops are counted to obtain the urine volume. After urine flow is converted into urine drops, the urine volume of the device passing through in unit time is not large, and when the urine volume of a patient is large, the urine can be accumulated to a certain degree, so that the real-time effect cannot be achieved, and even the normal urination of the patient can be influenced. And the urine component can change with treatment scheme and patient's renal function state, and its viscosity can change to the shape of urine drop, size also can change, and the volume that corresponds to the urine drop can change, and the error that this reason produced can accumulate along with monitoring time.

2. Weight measurement method: the weight of the urine discharged by the patient is monitored in real time, and the volume is converted according to the urine density. Hardly guarantee in the monitoring environment unstability, uncontrollable ward that the urine bag state of weighing is unchangeable, urine density can cause weight conversion to the volume to produce the error along with treatment scheme and renal function state change, and the evacuation in-process can't monitor after the urine bag is filled in addition.

3. Volume measurement: the liquid level of the container with the fixed volume is monitored through the liquid level sensor, and then the urine volume is directly obtained. The measuring result of the volume measuring method can be influenced by the fact that the liquid level does not fluctuate and change due to the shaking or posture change of the urine bag. Also, the emptying of the urine bag cannot be monitored.

4. Flow rate measurement: urine flow is measured directly using a flow rate sensor. The influence of urine composition changes, and it is difficult to establish accurate velocity of flow mathematical model, needs the calibration before the use, and flow sensor is difficult to accurate monitoring to the low velocity of flow moreover.

Disclosure of Invention

The invention aims to provide a stable, accurate and convenient low-power consumption automatic monitoring device for the urine volume of a patient.

The technical scheme adopted by the invention for solving the technical problems is as follows: a low-power consumption automatic monitoring device for the urine volume of a patient is characterized by comprising a liquid inlet electromagnetic valve, a liquid inlet electromagnetic valve driving circuit, a liquid outlet electromagnetic valve driving circuit, a filling detection electrode, a filling detection circuit, an emptying detection electrode, an emptying detection circuit, a urine collection tube, a single-chip microcomputer control circuit, a power management module, a data storage module, a wireless transmission module, a display module, a key control module and a clock module; the urine collecting pipe is connected between the liquid inlet electromagnetic valve and the liquid outlet electromagnetic valve; the filling detection electrode is positioned at the joint of the urine collecting pipe and the liquid inlet electromagnetic valve, and the distance between the two electrodes is the maximum value and is connected to the filling detection circuit; the filling detection circuit is connected to the analog-to-digital conversion AD port of the singlechip control circuit; the emptying detection electrode is positioned at the joint of the urine collecting pipe and the liquid outlet electromagnetic valve, the distance between the two pole pieces is the maximum value, and the emptying detection electrode is connected to the emptying detection circuit; the emptying detection circuit is connected with an analog-to-digital conversion (AD) port of the singlechip control circuit; the liquid inlet electromagnetic valve driving circuit is connected between the liquid inlet electromagnetic valve and the IO port of the single chip microcomputer control circuit; the liquid outlet electromagnetic valve driving circuit is connected between the liquid outlet electromagnetic valve and the IO port of the singlechip control circuit; the power management module, the data storage module, the wireless transmission module, the display module, the key control module and the clock module are all connected to the singlechip control circuit; the singlechip control circuit controls the opening and closing of the liquid inlet electromagnetic valve and the liquid outlet electromagnetic valve according to the conduction states of the filling detection electrode and the emptying detection electrode, so that the urine collection tube is filled and emptied, the urine of the patient is discharged by dividing the urine into unit volumes, the filling times of the urine collection tube are counted, the product of the count value and the volume of the urine collection tube is the urine volume of the patient, and the urine volume and the urine flow rate per hour are calculated according to the urine volume and the urine flow rate to be displayed, stored and sent.

Optionally, the liquid inlet electromagnetic valve and the liquid outlet electromagnetic valve both adopt two-way type bistable pulse electromagnetic water valves; the liquid inlet electromagnetic valve driving circuit and the liquid outlet electromagnetic valve driving circuit both adopt field effect tube H bridge driving circuits; the volume of the urine collecting tube is a constant, and the volume of the urine collecting tube determines the urine volume monitoring precision.

The invention has the beneficial effects that: the monitoring device is simple, accurate in measurement, stable and reliable, convenient to use, capable of measuring real-time urine volume under various flow speed conditions, and capable of avoiding errors caused by changes of urine density and urine bag body positions.

Drawings

FIG. 1 is a block diagram of the system of the present invention.

FIG. 2 is a schematic diagram of the fill and empty detection circuit of the present invention.

Fig. 3 is a flow chart of the program of the singlechip for controlling the electric path.

Detailed Description

The following describes the implementation of the present invention in detail with reference to the accompanying drawings, but the present invention is not limited to the implementation of the present invention, and all similar structures and similar variations thereof adopted by the present invention shall fall within the protection scope of the present invention.

The system block diagram of this embodiment is shown in fig. 1, and a low-power consumption automatic monitoring device for patient urine volume is characterized by comprising a liquid inlet solenoid valve 1, an filling detection electrode 2, an emptying detection electrode 3, a liquid outlet solenoid valve 4, a urine collecting tube 5, a liquid inlet solenoid valve driving circuit 6, a filling detection circuit 7, an emptying detection circuit 8, a liquid outlet solenoid valve driving circuit 9, a single-chip microcomputer control circuit 10, a display module 11, a wireless transmission module 12, a key control module 13, a data storage module 14, a power management module 15, and a clock module 16; the volume of the urine collecting tube 5 is set to be 1 ml, namely the urine volume monitoring precision is set to be 1 ml; the urine collecting pipe 5 is connected between the liquid inlet electromagnetic valve 1 and the liquid outlet electromagnetic valve 4; the filling detection electrode 2 is positioned at the joint of the urine collection pipe 5 and the liquid inlet electromagnetic valve 1, and the distance between the two electrodes takes the maximum value and is connected to the filling detection circuit 7; the filling detection circuit 7 is connected to an analog-to-digital conversion AD port of the single chip microcomputer control circuit 10, and the single chip microcomputer control circuit 10 adopts an ultra-low power consumption single chip microcomputer chip STM32L151CBT 6; the emptying detection electrode 3 is positioned at the joint of the urine collecting pipe 5 and the liquid outlet electromagnetic valve 4, the distance between the two electrodes is the maximum value, and the emptying detection electrode is connected to the emptying detection circuit 8; the emptying detection circuit 8 is connected with an analog-to-digital conversion AD port of the singlechip control circuit 10; the liquid inlet electromagnetic valve driving circuit 6 is connected between the liquid inlet electromagnetic valve 1 and an IO port of the single chip microcomputer control circuit 10 by adopting an integrated MOS tube H bridge driving circuit chip HR 2125; the liquid outlet electromagnetic valve driving circuit 4 adopts an integrated MOS tube H-bridge driving circuit chip HR2125 and is connected between the liquid outlet electromagnetic valve 9 and the IO port of the singlechip control circuit 10; the display module 11, the wireless transmission module 12, the key control module 13, the data storage module 14, the power management module 15 and the clock module 16 are all connected to the single chip microcomputer control circuit 10; display module 11 adopts 2.42 cun OLED screen, wireless transmission module 12 adopts the 4.0 modules of CC2541 bluetooth, data storage module 14 adopts the 16G SD card, power management module 15 adopts the TP4056 chip to supply power for whole device, clock module 16 adopts DS1306 clock chip.

As shown in fig. 2, a schematic diagram of the filling detection circuit 7 and the emptying detection circuit 8 includes a filter capacitor C1 with a value of 0.1uF connected between two electrode inputs S1 and S2; the electrode input S2 is grounded, the electrode input S1 is connected to VCC through an over pull-up resistor R1 with the value of 100K Ω, and is connected to the analog-to-digital conversion AD port of the singlechip control circuit 10 through a current-limiting resistor R2 with the value of 510 Ω.

The program flow chart of the single chip microcomputer control circuit 10 is shown in fig. 3, and the main program firstly initializes WDT, an external clock, a timer, ADC, UART, a display module, a data storage module, a wireless transmission module, and GUI, and then opens an interrupt, updates GUI content in real time, and detects the input of the key control module 13. During the timer interrupt process, the sampling rate is set to control the AD conversion, which in this example is set to 200 Hz. In an ADC interrupt processing program, processing the input AD conversion results of the filling detection circuit 7 and the emptying detection circuit 8, if the input of the filling detection circuit 7 is less than 3V, closing the liquid inlet electromagnetic valve 1, and opening the liquid outlet electromagnetic valve 4 after delaying for 10 milliseconds; if the input of the emptying detection circuit 8 is more than 3V, the liquid outlet electromagnetic valve 4 is closed, the liquid inlet electromagnetic valve 1 is opened after 10 milliseconds of delay, and the filling times are counted. Since the volume of the urine collection tube 5 is constant 1 ml, the product of the emptying frequency count value and the volume of the urine collection tube is the urine volume of the patient, the time is read from the clock module 16, the urine volume per hour and the urine flow rate are calculated and displayed on the display module 11 and stored in the data storage module 14, and meanwhile, the data are sent through the wireless transmission module 12.

Claims

1. A low-power consumption automatic monitoring device for the urine volume of a patient is characterized by comprising a liquid inlet electromagnetic valve, a liquid inlet electromagnetic valve driving circuit, a liquid outlet electromagnetic valve driving circuit, a filling detection electrode, a filling detection circuit, an emptying detection electrode, an emptying detection circuit, a urine collection tube, a single-chip microcomputer control circuit, a power management module, a data storage module, a wireless transmission module, a display module, a key control module and a clock module; the urine collecting pipe is connected between the liquid inlet electromagnetic valve and the liquid outlet electromagnetic valve; the filling detection electrode is positioned at the joint of the urine collecting pipe and the liquid inlet electromagnetic valve, and the distance between the two electrodes is the maximum value and is connected to the filling detection circuit; the filling detection circuit is connected to the analog-to-digital conversion AD port of the singlechip control circuit; the emptying detection electrode is positioned at the joint of the urine collecting pipe and the liquid outlet electromagnetic valve, the distance between the two pole pieces is the maximum value, and the emptying detection electrode is connected to the emptying detection circuit; the emptying detection circuit is connected with an analog-to-digital conversion (AD) port of the singlechip control circuit; the liquid inlet electromagnetic valve driving circuit is connected between the liquid inlet electromagnetic valve and the IO port of the single chip microcomputer control circuit; the liquid outlet electromagnetic valve driving circuit is connected between the liquid outlet electromagnetic valve and the IO port of the singlechip control circuit; the power management module, the data storage module, the wireless transmission module, the display module, the key control module and the clock module are all connected to the singlechip control circuit; the singlechip control circuit controls the opening and closing of the liquid inlet electromagnetic valve and the liquid outlet electromagnetic valve according to the conduction states of the filling detection electrode and the emptying detection electrode, so that the urine collection tube is filled and emptied, the urine of the patient is discharged by dividing the urine into unit volumes, the filling times of the urine collection tube are counted, the product of the count value and the volume of the urine collection tube is the urine volume of the patient, and the urine volume and the urine flow rate per hour are calculated according to the urine volume and the urine flow rate to be displayed, stored and sent.

2. The automatic low-power consumption patient urine volume monitoring device according to claim 1, wherein the inlet solenoid valve and the outlet solenoid valve are two-way type bistable pulse solenoid valves.

3. The automatic patient urine volume monitoring device with low power consumption as claimed in claim 1, wherein the driving circuit of the inlet solenoid valve and the driving circuit of the outlet solenoid valve both adopt a field effect transistor H bridge driving circuit.

4. The automatic low power consumption monitoring device for urine volume of patient as claimed in claim 1, wherein the volume of said urine collecting tube is constant, and the volume determines the urine volume monitoring accuracy.