CN102871655A - Small-size bladder disease monitor - Google Patents

Abstract

The invention provides a small-size bladder disease monitor which comprises a stabilized-voltage direct-current power supply, a miniature pressure sensor, a controller, a liquid crystal display screen and an A/D (analog/digital) converter. The stabilized-voltage direct-current power supply supplies power for the miniature pressure sensor, bladder-pressure voltage signals measured by the pressure sensor are amplified by a differential amplifier and then sent to a single-chip microcomputer to be processed, and finally bladder-pressure monitoring results are displayed. The small-size bladder disease monitor is easy and convenient to operate, causes small wound, is low-cost and good in relevancy, capable of monitoring the bladder pressure in real time, has the advantages of short measurement time, data accuracy, high automatization degree and the like, and brings convenience for medical staff to control patients' conditions in time.

Description

Small Bladder Disease Monitor

technical field

The present invention relates to a medical device for bladder diseases, in particular to a small monitor capable of real-time monitoring of intravesical pressure.

Background technique

In foreign countries, Kron first proposed to solve clinical medical problems by measuring bladder pressure and UBP (intravesical pressure); later, Pottecher advocated that abdominal compartment syndrome can be treated by continuous monitoring of UBP; in 1987, Takayama et al proposed the use of The pressure sensor they developed measures bladder pressure.

The aforementioned measurement of bladder pressure mostly involves inserting a urinary catheter into the bladder, slowly injecting about 50ml of normal saline into the bladder, and then measuring the pressure when the fluid flows out of the bladder. This method is simple and practical, and the measured value can truly reflect the human bladder pressure value. However, this method has a very fatal shortcoming, that is, every time the bladder pressure is measured, normal saline needs to be injected into the bladder. In general intensive care, it is injected and measured every 4 to 12 hours. This intermittent measurement may affect medical staff in time. Understand the changes in the patient's bladder pressure, and even delay the best time for rescue.

Contents of the invention

In order to overcome the deficiency that the bladder pressure needs to be injected into the bladder to measure the bladder pressure and cannot be measured in real time, the present invention provides a small bladder disease monitor, which can measure the bladder pressure in real time without injecting normal saline into the bladder, thereby achieving real-time monitoring Purpose of bladder disease.

To achieve the above object, the technical scheme of the present invention is as follows:

A small bladder disease monitor is provided, including a constant voltage direct current power supply, a miniature pressure sensor, a controller, a liquid crystal display and an A/D converter. The output terminals of the regulated DC power supply are respectively connected to the power pins of the miniature pressure sensor, the controller and the LCD display, the signal output terminal of the miniature pressure sensor is connected to the input terminal of the differential amplifier, and the output terminal of the differential amplifier is connected to an I/O port of the controller , the liquid crystal display and the A/D converter are respectively connected to one I/O port of the controller.

The output voltage of the stabilized DC power supply is a stable +5V DC voltage.

The miniature pressure sensor is a miniature probe type pressure sensor, which is a bridge circuit composed of four adjustable resistors R0, and generates double-terminal output signals u1 and u2.

The differential amplifier is composed of an operational amplifier A1, resistors R1-R3 and capacitors C1-C3.

The controller is a single-chip microcomputer.

The invention has the advantages of simple operation, small trauma, low price and good correlation, can realize real-time monitoring of bladder pressure, has the advantages of short measurement time, accurate data and high degree of automation, and is convenient for medical staff to grasp the patient's condition in time.

Description of drawings

Fig. 1 is a system structure block diagram of the present invention;

Fig. 2 is the miniature pressure sensor schematic diagram of the present invention;

Fig. 3 is a schematic diagram of the differential amplifier of the present invention;

Fig. 4 is the flow chart of the single-chip microcomputer software processing of the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the present invention will be further described:

The miniature pressure sensor adopts a probe type pressure sensor, the controller adopts a single-chip microcomputer model of STC12C5616AD, and the LCD display model is QC12864B. Amplifier, microcontroller and LCD display power supply. The pressure sensor senses changes in bladder pressure and generates double-ended output signals u1 and u2. The double-ended output signal is amplified by a differential amplifier to obtain a single-ended voltage signal Vctrl, which is collected by a single-chip microcomputer and converted into a digital signal and transferred to the memory for processing. As shown in Figure 4, after writing a program for data calculation, the converted data is converted into a real pressure value again, and then converted into point coordinates on the LCD screen and displayed on the screen one by one, which can support the pressure value within 30 seconds Display, thus forming a pressure-time (P-t) curve. This curve is intuitive and clear, which is conducive to data comparison and analysis, and a better grasp of the patient's condition.

As shown in Figure 2, the micro-probe pressure sensor is a bridge circuit composed of four adjustable resistors R0, which generate double-ended output signals u1 and u2; as shown in Figure 3, the differential amplifier consists of an operational amplifier A1, a resistor R1 -R3 and capacitors C1-C3, the type of operational amplifier A1 is LM358P, u1 is connected to the non-inverting input terminal 2 of A1 through the resistor R1, u2 is connected to the inverting input terminal 1 of A1 through the resistor R2, and the resistor R3 is connected to the inverting input terminal of A1 in parallel Between the inverting input terminal 1 and the output terminal Vctrl, one end of capacitor C1 is connected to u1 and the other end is grounded, one end of capacitor C2 is connected to u2 and the other end is grounded, one end of capacitor C3 is connected to Vctrl and the other end is grounded.

Claims (5)

1. a small-sized bladder disease monitoring instrument, is characterized in that, comprises regulated direct current power supply, miniature pressure sensor, controller, liquid crystal display and A/D converter, and described regulated direct current power supply output end connects miniature pressure transducer respectively , the power supply pins of the controller and the LCD display, the signal output of the miniature pressure sensor is connected to the input of the differential amplifier, the output of the differential amplifier is connected to an I/O port of the controller, the LCD and the A/D converter are respectively Connects to one I/O port of the controller. 2. The small bladder disease monitor according to claim 1, wherein the output voltage of the regulated DC power supply is a stable +5V DC voltage. 3. The small bladder disease monitor as claimed in claim 1, wherein the miniature pressure sensor is a miniature probe type pressure sensor, and is a bridge circuit composed of 4 adjustable resistors R0, which produces a double-ended output Signals u1 and u2. 4. The small bladder disease monitor according to claim 1, wherein the differential amplifier is composed of an operational amplifier A1, resistors R1-R3 and capacitors C1-C3. 5. The small bladder disease monitor as claimed in claim 1, wherein the controller is a single-chip microcomputer.

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