CN211434376U

CN211434376U - Negative pressure meter alarm device for accurately controlling negative pressure of VSD

Info

Publication number: CN211434376U
Application number: CN201922115546.2U
Authority: CN
Inventors: 孟吉平; 崔妙然
Original assignee: First Affiliated Hospital of Zhengzhou University
Current assignee: First Affiliated Hospital of Zhengzhou University
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-09-08
Anticipated expiration: 2029-11-29

Abstract

The utility model discloses a negative pressure meter alarm device for accurately controlling VSD negative pressure, which comprises a main pressure pipe, a pressure dividing pipe, a meter head main body, a pressure dividing meter and a pressure meter connecting shaft, wherein a negative pressure sensor for detecting the internal air pressure of the pressure dividing pipe is arranged in the meter head main body, the pressure dividing meter comprises a shell and an electronic dial plate, a controller, a wireless transmitter and a signal processing unit are arranged in the shell, and the signal processing unit comprises a signal amplifying and adjusting circuit and a power amplifying circuit. The monitoring personnel can make emergency treatment immediately after receiving the alarm information, and the method is convenient to use and strong in real-time performance.

Description

Negative pressure meter alarm device for accurately controlling negative pressure of VSD

Technical Field

The utility model relates to a negative pressure table technical field especially relates to a negative pressure table alarm device of accurate control VSD negative pressure.

Background

The current clinical suction apparatus has wide application range of the head, and is mainly used for sputum suction method, VDS negative pressure drainage, continuous thoracic and abdominal cavity suction and the like in various ways. The existing pointer type negative pressure gauge generally comprises a main pressure pipe 1, a pressure dividing pipe 2, a gauge head main body 3, a pressure dividing gauge 4 and a pressure gauge connecting shaft 5, and is used for adjusting air pressure by arranging a quick adjusting knob and a fine adjusting knob, as shown in fig. 1. In the use, the VSD drainage tube blocks up or the VSD pellicle can lead to atmospheric pressure not in normal range when not tightly sealed, consequently will set up alarm device on the negative pressure table usually to improve the accuracy degree that the negative pressure is attracted, play the guard action to patient life safety. The pressure loss alarm device of the existing negative pressure suction system controls alarm through a vacuum pressure gauge monitoring circuit, but a VSD negative pressure probe of the vacuum pressure gauge has inaccurate detection, system amplification noise is easily generated in the signal processing process, larger error exists, and the alarm accuracy is to be improved.

So the utility model provides a new scheme to solve the problem.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned condition, for overcoming prior art's defect, the utility model aims to provide a negative pressure table alarm device of accurate control VSD negative pressure.

The technical scheme for solving the problem is as follows: a negative pressure meter alarm device for accurately controlling VSD negative pressure comprises a main pressure pipe, a pressure dividing pipe, a meter head main body, a pressure dividing meter and a pressure meter connecting shaft, wherein a negative pressure sensor for detecting the internal pressure of the pressure dividing pipe is arranged in the meter head main body; the signal processing unit comprises a signal amplification regulating circuit and a power amplifier circuit, wherein the input end of the signal amplification regulating circuit is connected with the signal output end of the negative pressure sensor, and the output end of the signal amplification regulating circuit is connected with the input end of the controller; the input end of the power amplifier circuit is connected with the alarm instruction output end of the controller, the output end of the power amplifier circuit is connected with the wireless transmitter, and the wireless transmitter establishes remote communication with intelligent equipment in the monitoring room.

Preferably, the signal amplification and adjustment circuit comprises a capacitor C1, one end of a capacitor C1 is connected to the output end of the negative pressure sensor, the other end of the capacitor C1 is connected to one ends of capacitors C2, C3, resistors R3 and R4 through a resistor R1, the other end of the capacitor C2 is connected to one ends of resistors R2 and R5 and the output end of an operational amplifier AR1, the other end of the capacitor C3 is connected to the other end of the resistor R2 and the inverting input end of an operational amplifier AR1, the non-inverting input end of the operational amplifier AR1 and the other end of the resistor R4 are grounded, the output end of the operational amplifier AR1 is connected to the inverting input end of the operational amplifier AR2 through a resistor R5, and the non-inverting input end of the operational amplifier AR 2.

Preferably, the inverting input terminal of the op-amp AR2 is further connected to one end of a resistor R6 and one end of a capacitor C4, the other end of the resistor R6 is connected to one end of a varistor RL1, and the other ends of the capacitor C4 and the varistor RL1 are connected to the output terminal of the op-amp AR2 and the input terminal of the controller.

Preferably, the power amplifier circuit comprises a triode VT1, the base of the triode VT1 is connected to the alarm command output terminal of the controller through a capacitor C5 and is grounded through a resistor R7, the collector of the triode VT1 is connected to one end of a resistor R8 and a +5V power supply, the emitter of the triode VT1 is connected to the gate of a MOS transistor Q1, the source of the MOS transistor Q1 is grounded, the drain of the MOS transistor Q1 is connected to the other end of the resistor R8 and is connected to one end of an inductor L1 through a capacitor C6, and the other end of the inductor L1 is connected to the wireless transmitter.

Through the technical scheme, the beneficial effects of the utility model are that:

1. the signal amplification and adjustment circuit processes the output signal of the negative pressure sensor, the signal sent into the operational amplifier AR1 is firstly subjected to frequency selection output in a second-order band-pass filter network formed by resistors R1 and R2 and capacitors C2 and C3, so that clutter interference is effectively reduced, the signal is amplified by the operational amplifier AR1 and then sent into the inverting input end of the operational amplifier AR2, the signal-to-noise ratio of the detection signal can be effectively improved by using the differential amplification principle, and the precision of the negative pressure detection signal is effectively improved;

2. the operational amplifier AR2 utilizes the resistance-capacitance feedback principle to adjust the detection signal in the signal output process, so as to effectively reduce the system error, and the resistance value of the rheostat RL1 is adjusted to change the amplification coefficient of the operational amplifier AR2, thereby conveniently adjusting the amplitude range of the signal input into the controller;

3. after an alarm instruction signal sent by the controller is subjected to power amplification by the power amplification circuit, the alarm instruction is remotely transmitted to intelligent equipment in a monitoring room by the wireless transmitter to be displayed, and monitoring personnel immediately make emergency treatment after receiving the alarm information, so that the intelligent monitoring system is convenient to use and high in instantaneity.

Drawings

FIG. 1 is a schematic diagram of a prior art structure

Fig. 2 is a schematic diagram of the signal amplification and adjustment circuit of the present invention.

Fig. 3 is a schematic diagram of the power amplifier circuit of the present invention.

Detailed Description

The foregoing and other technical matters, features and effects of the present invention will be apparent from the following detailed description of the embodiments, which is to be read in connection with the accompanying drawings 2 to 3. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

A negative pressure meter alarm device for accurately controlling VSD negative pressure comprises a main pressure pipe, a pressure dividing pipe, a meter head main body, a pressure dividing meter and a pressure meter connecting shaft. Be provided with in the gauge outfit main part and be used for detecting the negative pressure sensor of the inside atmospheric pressure of minute pressure pipe, divide the manometer to include casing and electronic dial plate, inside controller, wireless transmitter and the signal processing unit of setting up of casing, the controller passes through serial ports connection electronic dial plate, and the electronic dial plate is used for showing the negative pressure detected value in real time.

The signal processing unit comprises a signal amplification regulating circuit and a power amplifier circuit, wherein the input end of the signal amplification regulating circuit is connected with the signal output end of the negative pressure sensor, and the output end of the signal amplification regulating circuit is connected with the input end of the controller. The input end of the power amplifier circuit is connected with the alarm instruction output end of the controller, the output end of the power amplifier circuit is connected with the wireless transmitter, and the wireless transmitter and the intelligent equipment in the monitoring room establish remote communication.

In order to improve the accuracy of negative pressure detection, a signal amplification and adjustment circuit is adopted to process the output signal of the negative pressure sensor. As shown in fig. 2, the signal amplification and adjustment circuit includes a capacitor C1, one end of the capacitor C1 is connected to the output end of the negative pressure sensor, the other end of the capacitor C1 is connected to one ends of the capacitors C2, C3, R3, and R4 through a resistor R1, the other end of the capacitor C2 is connected to one ends of the resistors R2 and R5 and the output end of the operational amplifier AR1, the other end of the capacitor C3 is connected to the other end of the resistor R2 and the inverting input end of the operational amplifier AR1, the non-inverting input end of the operational amplifier AR1 and the other end of the resistor R4 are grounded, the output end of the operational amplifier AR1 is connected to the inverting input end of the operational amplifier AR2 through a resistor R5, and the non-inverting input end.

Detection signals of the negative pressure sensor are coupled by a capacitor C1 and then are respectively sent to the operational amplifiers AR1 and AR2 in two ways, so that the operational amplifiers U1 and U2 form a composite differential amplifier. The signal sent into the operational amplifier AR1 is firstly subjected to frequency selection output in a second-order band-pass filter network formed by resistors R1 and R2 and capacitors C2 and C3, so that clutter interference is effectively reduced, and then the signal is amplified by the operational amplifier AR1 and sent to the inverting input end of the operational amplifier AR 2. The amplified signal of the operational amplifier AR1 and the input signal of the non-inverting input end of the operational amplifier AR2 form differential mode input, and the signal-to-noise ratio of the detection signal can be effectively improved by utilizing the differential amplification principle, so that the accuracy of the negative pressure detection signal is effectively improved.

The inverting input end of the operational amplifier AR2 is further connected to one ends of a resistor R6 and a capacitor C4, the other end of the resistor R6 is connected to one end of a varistor RL1, and the other ends of the capacitor C4 and the varistor RL1 are connected to the output end of the operational amplifier AR2 and the input end of the controller. The operational amplifier AR2 utilizes the RC feedback principle to adjust the detection signal in the process of outputting the signal, thereby effectively reducing the system error. Adjusting the resistance of rheostat RL1 changes the amplification factor of op-amp AR2, thereby facilitating adjustment of the amplitude range of the signal input to the controller.

After receiving the output signal of the signal amplification and adjustment circuit, the controller compares the signal amplitude with a system preset safety range value. When the signal amplitude exceeds the system safety range value, the controller sends out an alarm instruction signal. For example, the system sets the safe negative pressure range of the negative pressure drainage to be 0.04-0.06Mpa, when the VSD drainage tube is blocked or the VSD semipermeable membrane is not tightly sealed, and the like, the detection signal of the negative pressure sensor is processed by the signal amplification and adjustment circuit, the detection signal value sent into the controller exceeds the safe range, and then the controller sends out an alarm instruction signal.

As shown in fig. 3, the alarm command signal is power amplified by a power amplifier circuit. The power amplifier circuit comprises a triode VT1, the base electrode of the triode VT1 is connected with the alarm instruction output end of the controller through a capacitor C5 and is grounded through a resistor R7, the collector electrode of the triode VT1 is connected with one end of a resistor R8 and a +5V power supply, the emitter electrode of the triode VT1 is connected with the grid electrode of an MOS tube Q1, the source electrode of the MOS tube Q1 is grounded, the drain electrode of the MOS tube Q1 is connected with the other end of the resistor R8 and is connected with one end of an inductor L1 through a capacitor C6, and the other end of the inductor L1 is connected with a wireless transmitter.

Alarm command signals are subjected to high-pass filtering by an RC formed by a capacitor C5 and a resistor R7 and then sent into a triode VT1 and an MOS transistor Q1 to be subjected to power amplification, so that the signal transmission power is effectively improved, then after high-frequency signals are generated by series resonance of the capacitor C6 and an inductor L1, the processed alarm commands are remotely transmitted to intelligent equipment in a monitoring room by a wireless transmitter to be displayed, for example, a mobile phone, a tablet personal computer and the like, and monitoring personnel immediately perform emergency treatment after receiving alarm information.

To sum up, the utility model discloses a design signal amplification regulating circuit handles negative pressure sensor's output signal, reduces the system noise that produces among the signal processing process, reduces system error, effectively improves the degree of accuracy that the negative pressure detected, adopts wireless transmission's form to report to the police, and it is more convenient to use, with strong real-time, and negative pressure table warning degree of accuracy is high.

The above description is provided for further details of the present invention with reference to the specific embodiments, which should not be construed as limiting the present invention; to the utility model discloses affiliated and relevant technical field's technical personnel are based on the utility model discloses under the technical scheme thinking prerequisite, the extension of doing and the replacement of operating method, data all should fall within the utility model discloses within the protection scope.

Claims

1. The utility model provides a negative pressure gauge alarm device of accurate control VSD negative pressure, includes main pressure pipe, minute pressure pipe, gauge outfit main part, minute pressure meter and manometer connecting axle, its characterized in that: the gauge head main body is internally provided with a negative pressure sensor for detecting the air pressure in the partial pressure tube, the partial pressure tube comprises a shell and an electronic dial plate, the shell is internally provided with a controller, a wireless transmitter and a signal processing unit, and the controller is connected with the electronic dial plate through a serial port;

the signal processing unit comprises a signal amplification regulating circuit and a power amplifier circuit, wherein the input end of the signal amplification regulating circuit is connected with the signal output end of the negative pressure sensor, and the output end of the signal amplification regulating circuit is connected with the input end of the controller; the input end of the power amplifier circuit is connected with the alarm instruction output end of the controller, the output end of the power amplifier circuit is connected with the wireless transmitter, and the wireless transmitter establishes remote communication with intelligent equipment in the monitoring room.

2. The negative pressure gauge warning device according to claim 1, characterized in that: the signal amplification and adjustment circuit comprises a capacitor C1, one end of a capacitor C1 is connected with the output end of the negative pressure sensor, the other end of the capacitor C1 is connected with one ends of capacitors C2, C3, resistors R3 and R4 through a resistor R1, the other end of the capacitor C2 is connected with one ends of resistors R2 and R5 and the output end of an operational amplifier AR1, the other end of the capacitor C3 is connected with the other end of the resistor R2 and the inverting input end of an operational amplifier AR1, the non-inverting input end of the operational amplifier AR1 and the other end of the resistor R4 are grounded, the output end of the operational amplifier AR1 is connected with the inverting input end of the operational amplifier AR2 through a resistor R5, and the non-inverting input end of the operational amplifier AR 58.

3. The negative pressure gauge warning device according to claim 2, characterized in that: the inverting input end of the operational amplifier AR2 is further connected with one end of a resistor R6 and one end of a capacitor C4, the other end of the resistor R6 is connected with one end of a rheostat RL1, and the other ends of the capacitor C4 and the rheostat RL1 are connected with the output end of the operational amplifier AR2 and the input end of the controller.

4. The negative pressure gauge warning device according to claim 1, characterized in that: the power amplifier circuit comprises a triode VT1, the base of the triode VT1 is connected with the alarm instruction output end of the controller through a capacitor C5 and is grounded through a resistor R7, the collector of the triode VT1 is connected with one end of a resistor R8 and a +5V power supply, the emitter of the triode VT1 is connected with the grid of an MOS tube Q1, the source of the MOS tube Q1 is grounded, the drain of the MOS tube Q1 is connected with the other end of the resistor R8 and is connected with one end of an inductor L1 through a capacitor C6, and the other end of the inductor L1 is connected with the wireless transmitter.