WO2018184398A1

WO2018184398A1 - Air-pressure double-protection system and method for medical device

Info

Publication number: WO2018184398A1
Application number: PCT/CN2017/115170
Authority: WO
Inventors: 肖开华; 罗小兵; 谢洪
Original assignee: 广州龙之杰科技有限公司
Priority date: 2017-04-06
Filing date: 2017-12-08
Publication date: 2018-10-11
Also published as: CN107046275A; CN107046275B

Abstract

Disclosed is an air-pressure double-protection system for a medical device. The system comprises a single chip microprocessor. The single chip microprocessor generates a signal source and transmits the same to an air-pressure control circuit, and the air-pressure control circuit outputs a voltage control source. The voltage control source is divided into two paths, wherein one path is connected to an air-pressure control device through an air-pressure control switch, and the other path is connected to a circuit detection unit. When the air-pressure control circuit becomes abnormal, the circuit detection unit outputs a trigger control signal to trigger the air-pressure control switch to turn off the voltage control source, thereby cutting off the air-pressure control device. Further, when the single chip microprocessor determines, by means of a pressure sensor and a pressure acquisition circuit, that the pressure of an air-pressure output device becomes abnormal, a protection signal is outputted to control the air-pressure control switch to turn off, thereby cutting off the air-pressure control device. The present invention can overcome defects of an existing medical device, such as slow air-pressure control response and poor reliability, has an air-pressure double-protection function, and provides a first protection with a response speed that is far more rapid than the response speed of a traditional air-pressure protection measure.

Description

Medical equipment pressure double protection system and method

Technical field

The invention relates to the field of medical instruments, in particular to a dual protection system and method for medical equipment.

Background technique

With the continuous advancement and development of society and the changes in population structure, medical rehabilitation has gradually gained the attention and attention of the world. Medical equipment is a very important part of medical rehabilitation. In many medical and rehabilitation activities today, medical equipment is inseparable. In medical devices, many devices use air pressure control. In order to ensure the safe use of equipment, basically all equipment has certain airway protection measures.

At present, the existing air pressure protection measures generally involve the controller monitoring the pressure sensor signal in real time. When the gas path is abnormal, the signal collected by the pressure sensor is transmitted to the single chip microcomputer, and the single chip microcomputer responds to the process, so that the gas path stops working. This system of detecting response through a barometric sensor, although very fast, in the event of a race against time, when the gas path is abnormal, the system detects the signal, then issues an alarm or turns off the gas delivery, which is most likely Inflicted damage to the patient. Moreover, the reliability of a single gas path protection is insufficient. Once the pressure sensor is not working properly, or the program is abnormal, the system will lose the monitoring and control function of the gas circuit loop. At this time, the pressure is uncontrollable and the patient is extremely It may cause accidental injury.

Therefore, it is of great significance to design a system that can increase the speed of abnormal air pressure treatment and has dual air pressure protection.

Summary of the invention

The object of the present invention is to overcome the defects of the prior medical device, such as slow air control response and insufficient reliability, and provide a dual protection system for medical equipment, which has a dual pressure protection function. And the first heavy protection reaction speed is much faster than the traditional air pressure protection measures.

Another object of the present invention is to provide a method of dual protection of medical equipment pressure.

The object of the invention is achieved by the following technical solutions:

A medical equipment pressure double protection system, comprising a single chip microcomputer, a pneumatic control circuit, a circuit detecting unit, a pneumatic control switch, a pneumatic control device, a pneumatic output device, a pressure sensor, a pressure collecting circuit, wherein the single chip generates a signal source Ui of the air pressure control circuit and Transmission to the air pressure control circuit, the air pressure control circuit outputs a voltage control source, the voltage control source is divided into two ways: one through the air pressure control switch to the air pressure control device, as a control signal of the air pressure control device, to achieve the control of the air pressure; Connected to the circuit detection unit all the way, when the air pressure control circuit is abnormal, the circuit detection unit outputs a trigger control signal, triggers the air pressure control switch, and the air pressure control switch turns off the voltage control source, thereby cutting off the air pressure control device to realize the air pressure protection function; the air pressure control The device is used to control whether the air pressure output device works; the single chip microcomputer determines whether the pressure of the air pressure output device is normal through the pressure sensor and the pressure collecting circuit, and when the abnormality is determined, the protection signal is output to the air pressure control switch, and the air pressure control switch is controlled. Disconnected, thereby cutting off the pressure control device.

The air pressure control circuit includes an amplifying circuit, an integrating circuit, a differential circuit, a PNP type tube Q1, and a capacitor C6. The signal source Ui is amplified by an amplifying circuit and reaches an integrating circuit. After integration, it is transmitted to a PNP type tube Q1, and amplified by a PNP type tube Q1. Then, a non-inverting input terminal of the integrating circuit is connected through a differential circuit to form a closed-loop control network. One end of the capacitor C6 is grounded, and the other end is respectively connected with a differential circuit, a PNP type tube Q1, and an output voltage control source.

The gas pressure control circuit further includes a Zener diode D1, a resistor R3, a resistor R4, a resistor R6, a capacitor C1, and a capacitor C3;

The amplifying circuit comprises a resistor R1, a resistor R2, and an integrated operational amplifier U1B, wherein one end of the resistor R1 is The inverting input terminal of the integrated operational amplifier U1B is connected, and the other end is connected to the integrating circuit of the output terminal of the integrated operational amplifier U1B; one end of the resistor R2 is connected to the inverting input end of the integrated operational amplifier U1B, and the other end is input to the signal source Ui; The non-inverting input terminal of the integrated operational amplifier U1B is grounded;

The integrating circuit comprises a resistor R5, a capacitor C2, and an integrated operational amplifier U2B, wherein one end of the resistor R5 is connected to the output end of the integrated operational amplifier U1B, and the other end is connected to the inverting input end of the integrated operational amplifier U2B; one end of the capacitor C2 is The inverting input terminal of the integrated operational amplifier U2B is connected, and the other end is connected to the negative terminal of the Zener diode D1 together with the output end of the integrated operational amplifier U2B. The positive pole of the Zener diode D1 is connected to the base of the PNP type tube Q1 through the resistor R6. One end of the resistor R3 is connected to the anode of the Zener diode D1, and the other end is connected to the emitter of the PNP type tube Q1; one end of the resistor R4 is connected to the base of the PNP type tube Q1, and the other end is connected to the emitter of the PNP type tube Q1. Connection; one end of the capacitor C1 and the capacitor C3 is respectively connected to the emitter of the PNP type tube Q1, and the other end is grounded separately;

The differential circuit includes a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R13, and an integrated operational amplifier U3B. The output end of the integrated operational amplifier U3B is connected to the non-inverting input terminal of the integrated operational amplifier U2B, and one end of the resistor R13 is integrated. The inverting input of the operational amplifier U3B is connected, and the other end is connected to the non-inverting input of the integrated operational amplifier U2B; one end of the resistor R8 is connected to the non-inverting input of the integrated operational amplifier U3B, and the other end is grounded; one end of the resistor R7 is integrated with the operational amplifier The non-inverting input of U3B is connected, and the other end is connected to the collector of PNP type tube Q1; one end of resistor R9 is connected to the collector of PNP type tube Q1, and the other end is connected to capacitor C6.

The circuit detecting unit comprises a resistor R11, a resistor R12, and an integrated operational amplifier U4B. One end of the resistor R11 is connected to the air pressure control circuit, and the input voltage control source is connected, and the other end is connected with the non-inverting input terminal of the operational amplifier U4B; one end of the resistor R12 is The air pressure control circuit is connected and the other end is grounded; the inverting input of the integrated operational amplifier U4B is connected to the output of the integrated operational amplifier U4B, and the output of the integrated operational amplifier U4B is connected to the pneumatic control switch.

The air pressure control switch comprises a resistor R18, an NPN type tube Q2, a Zener diode D2, a relay, wherein one end of the resistor R18 is connected to the circuit detecting unit, and the other end is connected to the base of the NPN type tube Q2; the emission of the NPN type tube Q2 The pole is grounded, the collector is connected to the relay through the Zener diode D2, and the relay is connected to the air pressure control device.

The pressure collecting circuit comprises a resistor R15, a resistor R16, a resistor R17, a capacitor C8, a capacitor C9, and an integrated operational amplifier U5B. One end of the capacitor C8 is connected to the single chip microcomputer, and the other end is grounded; one end of the resistor R15 is connected to the single chip microcomputer, and the other end is connected with the single chip. The integrated operational amplifier U5B output is connected; the integrated operational amplifier U5B output is connected to the non-inverting input terminal, and the inverting input terminal of the integrated operational amplifier U5B is connected to the pressure sensor through the resistor R16; one end of the resistor R17 and the capacitor C9 is respectively connected with the integrated operational amplifier U5B The inverting input is connected and the other end is grounded.

The air pressure control device includes a solenoid valve, an air pump, and a proportional valve.

The air pressure output device includes a pneumatic shock wave handle, an air bag, and an air bag.

Another object of the invention is achieved by the following technical solutions:

A method for dual protection of medical equipment pressure includes the following steps:

The single chip generates a signal source Ui of the air pressure control circuit and transmits it to the air pressure control circuit, and the air pressure control circuit outputs a voltage control source;

The voltage control source is divided into two ways: one through the air pressure control switch to the air pressure control device, as the control signal of the air pressure control device, to achieve the control of the air pressure; the other is connected to the circuit detection unit, when the air pressure control circuit is abnormal, the circuit detection unit Output a trigger control signal to trigger the air pressure control switch, the air pressure control switch disconnects the voltage control source, thereby cutting off the air pressure control device to realize the air pressure protection function; the air pressure control device is used to control whether the air pressure output device works;

The single chip microcomputer determines whether the pressure of the air pressure output device is positive through the pressure sensor and the pressure collecting circuit. Normally, when an abnormality is determined, a protection signal is output to the air pressure control switch, and the air pressure control switch is turned off, thereby cutting off the air pressure control device.

The signal source Ui of the air pressure control circuit generated by the single chip microcomputer is completed by the following method: the PWM value generated by the single chip microcomputer generates the signal source Ui of the air pressure control circuit through low pass filtering or DAC conversion.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

1. The circuit detecting device of the present invention reacts more quickly and promptly when the air pressure is abnormal, and adds a heavy air pressure protection function, increases the circuit detecting module, and achieves the function of protecting the air pressure.

2. According to the implementation of the above technology, the invention reduces the risk of accidental injury to the patient, and can better meet the safe use requirements of the medical device, and has a more secure guarantee.

3. The circuit detecting unit, the air pressure control switch and the air pressure control device of the invention constitute a first heavy protection; the pressure sensor, the pressure collecting circuit, the single chip microcomputer, the air pressure control switch and the air pressure control device constitute a second heavy protection. In fact, the double protection of the present invention is not strictly differentiated, but the dual protection is at the same time, but most of the causes of the abnormality of the airway are caused by the abnormality of the control circuit, so the circuit detection unit and the air pressure control switch The protection scheme composed of the air pressure control device is often able to respond faster, so it is called the first heavy protection; and the abnormality of the air circuit is often detected by the pressure sensor, so it is called the second heavy protection. If the change in air pressure is fast enough, the second heavy protection may also become the first heavy protection, or the first heavy protection and the second heavy protection may be simultaneously activated.

DRAWINGS

1 is a schematic structural view of a dual pressure protection system for medical equipment according to the present invention.

2 is a circuit diagram of a dual pressure protection system for a medical device according to the present invention.

3 is a circuit diagram of the air pressure control circuit of the present invention.

detailed description

The present invention will be further described in detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto.

As shown in Fig. 1, a medical equipment pressure double protection system includes a single chip microcomputer, a pneumatic control circuit, a circuit detecting unit, a pneumatic control switch, a pneumatic control device, a pneumatic output device, a pressure sensor, a pressure collecting circuit, wherein the single chip generates a pneumatic control circuit. The signal source Ui is transmitted to the air pressure control circuit, and the air pressure control circuit outputs a voltage control source. The voltage control source is divided into two paths: one passes the air pressure control switch to the air pressure control device, and serves as a control signal of the air pressure control device to realize the air pressure. The other circuit is connected to the circuit detection unit. When the air pressure control circuit is abnormal, the circuit detection unit outputs a trigger control signal to trigger the air pressure control switch, and the air pressure control switch turns off the voltage control source, thereby cutting off the air pressure control device and realizing the air pressure protection. Function; the air pressure control device is used to control whether the air pressure output device works; the single chip microcomputer determines whether the pressure of the air pressure output device is normal through the pressure sensor and the pressure collecting circuit, and when the abnormality is determined, the protection signal is output to the air pressure control switch, and the air pressure is controlled. System switch is open, to cut off the pressure control device.

As shown in FIG. 3, the gas pressure control circuit further includes a Zener diode D1, a resistor R3, a resistor R4, a resistor R6, a capacitor C1, and a capacitor C3;

The amplifying circuit comprises a resistor R1, a resistor R2, and an integrated operational amplifier U1B, wherein one end of the resistor R1 is connected to the inverting input end of the integrated operational amplifier U1B, and the other end is connected to the integral end of the integrated operational amplifier U1B to the integrating circuit; One end of R2 is connected to the inverting input of the integrated operational amplifier U1B, and the other end is input signal. Source Ui; the non-inverting input of the integrated operational amplifier U1B is grounded; the model of the integrated operational amplifier U1B is LM358M;

2, the circuit detecting unit comprises a resistor R11, a resistor R12, and an integrated operational amplifier U4B, wherein one end of the resistor R11 is connected to the air pressure control circuit, the input voltage control source is connected, and the other end is connected with the non-inverting input terminal of the operational amplifier U4B; One end of R12 is connected to the air pressure control circuit, and the other end is grounded; the inverting input end of the integrated operational amplifier U4B is connected to the output end of the integrated operational amplifier U4B, and the output end of the integrated operational amplifier U4B is connected with the pneumatic control switch.

2, the pneumatic control switch includes a resistor R18, an NPN-type tube Q2, a Zener diode D2, and a relay, wherein one end of the resistor R18 is connected to the circuit detecting unit, and the other end is connected to the base of the NPN-type tube Q2. Connection; the emitter of the NPN tube Q2 is grounded, the collector is connected to the relay through the Zener diode D2; and the relay is connected to the air pressure control device.

As shown in FIG. 2, the pressure collecting circuit includes a resistor R15, a resistor R16, a resistor R17, a capacitor C8, a capacitor C9, and an integrated operational amplifier U5B. One end of the capacitor C8 is connected to the single chip microcomputer, and the other end is grounded; one end of the resistor R15 is connected to the single chip microcomputer. The other end is connected with the output terminal of the integrated operational amplifier U5B; the output terminal of the integrated operational amplifier U5B is connected with the non-inverting input terminal, and the inverting input terminal of the integrated operational amplifier U5B is connected with the pressure sensor through the resistor R16; the pressure sensor is arranged in the air pressure output device Or an accessory for monitoring the air pressure of the air pressure output device; one end of the resistor R17 and the capacitor C9 is respectively connected to the inverting input end of the integrated operational amplifier U5B, and the other end is grounded separately.

The air pressure control device includes a solenoid valve, an air pump, a proportional valve, and the like.

The PWM value generated by the microcontroller generates a signal source Ui of the air pressure control circuit through low-pass filtering or DAC conversion. In the air pressure control circuit, the signal source Ui is amplified by the amplifying circuit and reaches the integrating circuit. After integration, it is amplified to the amplifier tube Q1, Q1 is amplified, then passed through the differential circuit, and then connected to U2B to form a closed-loop control network. The C6+ terminal outputs a 6P image with U2B. Voltage; thus outputting a precise voltage control source.

The voltage control source is divided into two ways: one through the relay switch to the air pressure control device, as the control signal of the air pressure control device, to achieve the control of the air pressure; the other is connected to the first heavy protection circuit detection module, when the air pressure control circuit is abnormal, The circuit detection module outputs a trigger control signal, triggers the relay, and the relay disconnects the voltage control source, thereby cutting off the air pressure control device and realizing the air pressure protection function.

When the first heavy protection fails, the second heavy protection action: through the pressure sensor air pressure collecting circuit, the single chip passes the ADC to determine the abnormal air pressure, and outputs the control protection signal: the second heavy protection control signal. First The double protection control signal is connected to R19, which in turn is connected to Q2. When the second heavy protection control signal goes high, the relay can also be turned off, thereby cutting off the air pressure control device and realizing the air pressure protection function. Thereby achieving a dual protection function of the air pressure.

The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and combinations thereof may be made without departing from the spirit and scope of the invention. Simplifications should all be equivalent replacements and are included in the scope of the present invention.

Claims

A medical equipment pressure double protection system, comprising: a single chip microcomputer, a pneumatic control circuit, a circuit detecting unit, a pneumatic control switch, a pneumatic control device, a pneumatic output device, a pressure sensor, a pressure collecting circuit, wherein the single chip generates a pneumatic control circuit The signal source Ui is transmitted to the air pressure control circuit, and the air pressure control circuit outputs a voltage control source. The voltage control source is divided into two paths: one passes the air pressure control switch to the air pressure control device, and serves as a control signal of the air pressure control device to realize the air pressure. The other circuit is connected to the circuit detection unit. When the air pressure control circuit is abnormal, the circuit detection unit outputs a trigger control signal to trigger the air pressure control switch, and the air pressure control switch turns off the voltage control source, thereby cutting off the air pressure control device and realizing the air pressure protection. Function; the air pressure control device is used to control whether the air pressure output device works; the single chip microcomputer determines whether the pressure of the air pressure output device is normal through the pressure sensor and the pressure collecting circuit, and when the abnormality is determined, the protection signal is output to the air pressure control switch, and the control is performed. Pressure control switch is turned off, thereby cutting off the pressure control device.
The medical device pressure double protection system according to claim 1, wherein the air pressure control circuit comprises an amplifying circuit, an integrating circuit, a differential circuit, a PNP type tube Q1, and a capacitor C6, and the signal source Ui is amplified by the amplifying circuit to reach an integral. The circuit is integrated and transmitted to the PNP-type tube Q1. After being amplified by the PNP-type tube Q1, it is connected to a non-inverting input terminal of the integrating circuit through a differential circuit to form a closed-loop control network. One end of the capacitor C6 is grounded, and the other end is respectively connected to the differential circuit. The PNP type tube Q1 is connected and outputs a voltage control source.
The dual pressure protection system for medical equipment according to claim 2, wherein the air pressure control circuit further comprises a Zener diode D1, a resistor R3, a resistor R4, a resistor R6, a capacitor C1, and a capacitor C3;

The amplifying circuit comprises a resistor R1, a resistor R2, and an integrated operational amplifier U1B, wherein one end of the resistor R1 is connected to the inverting input end of the integrated operational amplifier U1B, and the other end is connected to the integral end of the integrated operational amplifier U1B to the integrating circuit; One end of R2 is connected to the inverting input end of the integrated operational amplifier U1B, and the other end is input to the signal source Ui; the non-inverting input end of the integrated operational amplifier U1B is grounded;

The integration circuit includes a resistor R5, a capacitor C2, and an integrated operational amplifier U2B, wherein one end of the resistor R5 is connected to the output end of the integrated operational amplifier U1B, and the other end is connected to the inverting input end of the integrated operational amplifier U2B; One end of C2 is connected to the inverting input terminal of the integrated operational amplifier U2B, and the other end is connected to the negative terminal of the Zener diode D1 together with the output end of the integrated operational amplifier U2B. The positive pole of the Zener diode D1 passes through the resistor R6 and the PNP type tube Q1. The base connection is connected; one end of the resistor R3 is connected to the anode of the Zener diode D1, and the other end is connected to the emitter of the PNP type tube Q1; one end of the resistor R4 is connected to the base of the PNP type tube Q1, and the other end is connected to the PNP type tube The emitter of Q1 is connected; one end of capacitor C1 and capacitor C3 is respectively connected to the emitter of PNP type tube Q1, and the other end is grounded separately;

The differential circuit includes a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R13, and an integrated operational amplifier U3B. The output end of the integrated operational amplifier U3B is connected to the non-inverting input terminal of the integrated operational amplifier U2B, and one end of the resistor R13 is integrated. The inverting input of the operational amplifier U3B is connected, and the other end is connected to the non-inverting input of the integrated operational amplifier U2B; one end of the resistor R8 is connected to the non-inverting input of the integrated operational amplifier U3B, and the other end is grounded; one end of the resistor R7 is integrated with the operational amplifier The non-inverting input of U3B is connected, and the other end is connected to the collector of PNP type tube Q1; one end of resistor R9 is connected to the collector of PNP type tube Q1, and the other end is connected to capacitor C6.
The medical device pressure double protection system according to claim 1, wherein the circuit detecting unit comprises a resistor R11, a resistor R12, and an integrated operational amplifier U4B, wherein one end of the resistor R11 is connected to the air pressure control circuit, and the input voltage control source is The other end is connected with the non-inverting input terminal of the operational amplifier U4B; one end of the resistor R12 is connected to the air pressure control circuit, and the other end is grounded; the inverting input terminal of the integrated operational amplifier U4B is connected with the output end of the integrated operational amplifier U4B, and the integrated operational amplifier U4B is connected. The output is connected to the air pressure control switch.
The medical device pressure double protection system according to claim 1, wherein the air pressure control switch comprises a resistor R18, an NPN type tube Q2, a Zener diode D2, and a relay, wherein one end of the resistor R18 is connected to the circuit detecting unit, and One end is connected to the base of the NPN type tube Q2; the emitter of the NPN type tube Q2 is grounded, the collector is connected to the relay through the Zener diode D2; and the relay is connected to the air pressure control device.
The dual pressure protection system for medical equipment according to claim 1, wherein the pressure collecting circuit comprises a resistor R15, a resistor R16, a resistor R17, a capacitor C8, a capacitor C9, and an integrated operational amplifier U5B, wherein one end of the capacitor C8 and the single chip microcomputer Connected, the other end is grounded; one end of the resistor R15 and a single piece The other end is connected to the output terminal of the integrated operational amplifier U5B; the output terminal of the integrated operational amplifier U5B is connected to the non-inverting input terminal, and the inverting input terminal of the integrated operational amplifier U5B is connected to the pressure sensor through the resistor R16; one end of the resistor R17 and the capacitor C9 Connect to the inverting input of the integrated op amp U5B and ground the other end.
The medical device air pressure dual protection system according to claim 1, wherein said air pressure control device comprises a solenoid valve, an air pump, and a proportional valve.
The medical device air pressure double protection system according to claim 1, wherein the air pressure output device comprises a pneumatic shock wave handle, an air bag, and an air bag.
A method for dual protection of medical equipment pressure, characterized in that it comprises the following steps:

The single chip generates a signal source Ui of the air pressure control circuit and transmits it to the air pressure control circuit, and the air pressure control circuit outputs a voltage control source;

The voltage control source is divided into two ways: one through the air pressure control switch to the air pressure control device, as the control signal of the air pressure control device, to achieve the control of the air pressure; the other is connected to the circuit detection unit, when the air pressure control circuit is abnormal, the circuit detection unit Output a trigger control signal to trigger the air pressure control switch, the air pressure control switch disconnects the voltage control source, thereby cutting off the air pressure control device to realize the air pressure protection function; the air pressure control device is used to control whether the air pressure output device works;

The single-chip microcomputer determines whether the pressure of the air pressure output device is normal through the pressure sensor and the pressure collecting circuit. When the abnormality is determined, the protection signal is output to the air pressure control switch, and the air pressure control switch is turned off, thereby cutting off the air pressure control device.
The dual pressure protection system for medical equipment according to claim 9, wherein the signal source Ui of the air pressure control circuit is generated by the single chip microcomputer, wherein the PWM value generated by the single chip generates air pressure through low-pass filtering or DAC conversion. The signal source Ui of the control circuit.