Air storage cylinder inflation system of air bag midwifery instrument

Abstract

The utility model relates to the technical field of medical equipment, and particularly discloses an air inflation system for an air storage cylinder of an air bag midwifery instrument, which can perform air inflation overpressure protection on the air storage cylinder so as to improve the use safety of the air bag midwifery instrument. Comprising an air storage cylinder, an air pump for inflating the air storage cylinder, an air bag communicated with the air storage cylinder, a pressure sensor for detecting the air pressure of the air storage cylinder, a first electromagnetic valve arranged on a communicating pipeline of the air storage cylinder and the air bag, a second electromagnetic valve for controlling opening and closing of the air bag, a control circuit board and an overpressure protection control circuit, the overvoltage protection control circuit comprises a voltage division circuit electrically connected with the pressure sensor, a voltage comparison circuit electrically connected with the voltage division circuit, a common collector circuit electrically connected with the voltage comparison circuit, and a logic AND gate circuit electrically connected with the common collector circuit and the control circuit board. The signal amplification circuit is electrically connected with the logic AND gate circuit, and the switching circuit is electrically connected with the signal amplification circuit and is electrically connected with the air pump.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to an air storage cylinder inflation system of an air bag midwifery instrument. Background Art

[0002] The airbag bionic midwifery technology uses a special airbag to simulate the action of the fetal head in advance through inflation and deflation to expand the soft birth canal, so that the birth canal reaches the size of the fetal head, thereby reducing the resistance of the fetal presenting part to descend, and temporarily turning primiparas into "multiparas", creating good conditions for smooth delivery in advance. The airbag midwifery instrument is a device that uses a computer program to control the inflation and deflation of a special airbag. It achieves mechanical stimulation and dilation of the cervix and vagina through inflation and deflation of the airbag, and also compresses the rectum and pelvic floor tissue to achieve the effect of midwifery. Figure 1 The schematic diagram of the module structure of the air cylinder inflation system of the existing air bag obstetric instrument is shown. When the air bag obstetric instrument is working, the solenoid valve 1 and the solenoid valve 2 are closed, and the control circuit board of the air bag obstetric instrument controls the air pump to inflate the air cylinder and detects the pressure of the air cylinder. When the pressure of the air cylinder reaches the expected value, the control circuit board controls the air pump to stop working. The control circuit board controls the solenoid valve 1 to inflate the airbag when it is opened, and deflates the airbag when it controls the solenoid valve 2 to open. During the process of the air pump inflating the air cylinder, when the control program of the control circuit board fails, it may cause the pressure of the air cylinder to be too high, which in turn causes the air cylinder to inflate the airbag with excessive pressure and cause harm to the human body. The safety of the air bag obstetric instrument is insufficient. Utility Model Content

[0003] Based on this, it is necessary to provide an air bag midwifery instrument air cylinder inflation system that can provide an air storage cylinder inflation overpressure protection to improve the safety of the air bag midwifery instrument in order to address the above-mentioned shortcomings.

[0004] A gas cylinder inflation system for an air bag midwifery instrument comprises a gas cylinder, an air pump for inflating the gas cylinder, an air bag connected to an output end of the gas cylinder, a pressure sensor for detecting the gas pressure in the gas cylinder, a first solenoid valve arranged on a pipeline connecting the gas cylinder and the air bag, a second solenoid valve for controlling the opening or closing of the air bag, a control circuit board, and an overvoltage protection control circuit, wherein the control circuit board is electrically connected to the pressure sensor, the first solenoid valve, the second solenoid valve, and the overvoltage protection control circuit, respectively; the overvoltage protection control circuit comprises a voltage divider circuit electrically connected to the pressure sensor, a voltage comparison circuit electrically connected to the voltage divider circuit, a common collector circuit electrically connected to the voltage comparison circuit, a logic AND gate circuit electrically connected to the common collector circuit and the control circuit board, a signal amplification circuit electrically connected to the logic AND gate circuit, and a switch circuit electrically connected to the signal amplification circuit, wherein the switch circuit is electrically connected to the gas pump.

[0005] In one embodiment, the voltage divider circuit includes a voltage divider resistor electrically connected to an output terminal of the pressure sensor.

[0006] In one embodiment, the voltage comparison circuit includes a voltage comparison chip electrically connected to a voltage dividing resistor.

[0007] In one embodiment, the common collector circuit includes a first transistor, the base of the first transistor is electrically connected to the voltage comparison chip, the emitter of the first transistor is grounded, and the collector of the first transistor is electrically connected to the logic AND gate circuit.

[0008] In one embodiment, the signal amplifying circuit includes a second transistor and a third transistor which are arranged in parallel and electrically connected to the logic AND gate circuit, and the emitter of the second transistor and the emitter of the third transistor are grounded respectively.

[0009] In one embodiment, the switching circuit includes a photoelectric coupler electrically connected to the second transistor and the third transistor respectively, and a first relay and a second relay arranged in parallel and electrically connected to the photoelectric coupler respectively, and the first relay and the second relay are both electrically connected to the air pump.

[0010] In one embodiment, the first relay and the second relay are both solid-state relays.

[0011] The air bag obstetric instrument air cylinder inflation system of the utility model is implemented by setting an overpressure protection control circuit. The circuit is connected to the pressure signal of the air cylinder detected by the pressure sensor, and after the pressure signal is divided by the voltage divider circuit, the voltage comparison circuit compares the pressure value of the cylinder with the standard pressure value, and outputs a high level when the cylinder pressure is higher than the standard pressure value. The high level is further transmitted to the common collector circuit, the signal amplification circuit and the switching circuit to control the air pump to stop working, so as to achieve overpressure protection when the air cylinder is inflated, avoid damage to the human body caused by excessive inflation pressure in the air bag, and improve the safety of the use of the air bag obstetric instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the module structure of the gas storage cylinder inflation system of the existing air bag midwifery instrument;

[0013] Figure 2 It is a schematic diagram of the module structure of the air storage cylinder inflation system of the air bag midwifery instrument in one embodiment of the utility model;

[0014] Figure 3 A module diagram of an overvoltage protection control circuit in one embodiment of the utility model;

[0015] Figure 4The figure is a circuit schematic diagram of an overvoltage protection control circuit in one embodiment of the utility model. DETAILED DESCRIPTION

[0016] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0017] Please combine Figure 2 and Figure 3 The utility model discloses an air bag midwifery instrument air cylinder inflation system 10 which can inflate an air cylinder for overpressure protection to improve the safety of the air bag midwifery instrument. The system comprises an air cylinder 100, an air pump 200 for inflating the air cylinder 100, an air bag 300 connected to the output end of the air cylinder 100, a pressure sensor 400 for detecting the air pressure of the air cylinder 100, a first solenoid valve 500 arranged on a pipeline connecting the air cylinder 100 and the air bag 300, a second solenoid valve 600 for controlling the opening or closing of the air bag 300, a control circuit board 700, and an overvoltage protection control circuit 800. The control circuit board 700 is electrically connected to the pressure sensor 400, the first solenoid valve 500, the second solenoid valve 600 and the overvoltage protection control circuit 800 respectively.

[0018] During the use of the airbag obstetric instrument, the control circuit board 700 first controls the first solenoid valve 500 and the second solenoid valve 600 to close, so that the connecting pipeline between the gas storage cylinder 100 and the airbag 300 is disconnected, and the air pressure in the airbag 300 remains unchanged (if the airbag 300 is filled with gas, the gas pressure is maintained; if the gas in the airbag 300 is emptied, the airbag 300 is maintained in a gas-emptied state). The control circuit board 700 sends an electrical signal to the overvoltage protection control circuit 800 to control the operation of the air pump 200. At the same time, the control circuit board 700 also controls the pressure sensor 400 to detect the air pressure value in the gas storage cylinder 100 in real time. Similarly, in this process, the overvoltage protection control circuit 800 receives the pressure detection value sent by the pressure sensor 400 and the air pump 200 motor driving signal sent by the control circuit board 700 in real time. After the overvoltage protection control circuit 800 compares the pressure value of the air storage cylinder 100 detected by the pressure sensor 400 with the control signal of the control circuit board 700, it outputs a signal for controlling the air pump 200 to inflate the air storage cylinder 100. When the air pressure value of the air storage cylinder 100 detected by the pressure sensor 400 reaches the standard pressure value set by the pressure sensor 400, the overvoltage protection control circuit 800 sends an electrical signal to the motor of the air pump 200 to control the motor of the air pump 200 to stop working, thereby stopping the inflation of the air storage cylinder 100. After the air storage cylinder 100 is filled with gas, the control circuit board 700 first controls the second solenoid valve 600 to close, and at the same time, the overvoltage protection control circuit 800 controls the first solenoid valve 500 to open, so that the air storage cylinder 100 inflates the airbag 300. When the airbag 300 needs to be deflated, the control circuit board 700 controls the first solenoid valve 500 to close, and the overvoltage protection control circuit 800 controls the second solenoid valve 600 to open, so as to discharge the gas in the airbag 300. In this embodiment, by sending the signal for controlling the operation of the air pump 200 issued by the control circuit board 700 to the overvoltage protection control circuit 800, the problem of excessive pressure in the airbag 300 caused by the control program failure of the control circuit board 700 when the control circuit board 700 independently controls the operation of the air pump 200 is avoided, thereby improving the safety of the use of the airbag midwifery instrument.

[0019] Please combine Figure 2-4In this embodiment, the overvoltage protection control circuit 800 includes a voltage divider circuit 810 electrically connected to the pressure sensor 400, a voltage comparison circuit 820 electrically connected to the voltage divider circuit 810, a common collector circuit 830 electrically connected to the voltage comparison circuit 820, a logic AND gate circuit 840 electrically connected to the common collector circuit 830 and the control circuit board 700, a signal amplifier circuit 850 electrically connected to the logic AND gate circuit 840, and a switch circuit 860 electrically connected to the signal amplifier circuit 850, and the switch circuit 860 is electrically connected to the air pump 200. Among them, the voltage divider circuit 810 is used to divide the pressure value detected by the pressure sensor 400. Preferably, the voltage divider circuit 810 includes a voltage divider resistor R27 electrically connected to the output end of the pressure sensor 400. The voltage comparison circuit 820 is used to compare the voltage value input by the pressure sensor 400 with the preset voltage value therein to determine whether the pressure condition of the gas storage cylinder 100 meets the requirements for safe use of the air bag midwifery instrument. Preferably, the voltage comparison circuit 820 includes a voltage comparison chip U4 electrically connected to the voltage-dividing resistor, and the voltage comparison chip U4 is a voltage detector of model TPS3710DDCR, which has a reference voltage set inside. The common collector circuit 830 is used to invert the level signal output by the voltage comparison circuit 820. In this embodiment, the common collector circuit 830 includes a first transistor Q4, the base of the first transistor Q4 is electrically connected to the voltage comparison chip, the emitter of the first transistor Q4 is grounded, and the collector of the first transistor Q4 is electrically connected to the logic AND gate circuit 840.

[0020] The logic AND gate circuit 840 is a digital logic circuit. Its output will become high only when all its input levels are high. Any low level input to the logic AND gate circuit 840 will generate a low level output at the output end of the logic AND gate circuit 840. In this embodiment, the logic AND gate circuit 840 simultaneously receives the control signal output by the control circuit board 700 and the signal output by the first transistor Q4. After the logic AND operation, a signal for controlling the operation of the air pump 200 is formed. By arranging the logic AND gate circuit 840 between the common collector circuit 830 and the control circuit board 700, the logic AND gate circuit 840 outputs a high level only when the control circuit board 700 and the common collector circuit 830 simultaneously output a high level for controlling the operation of the motor of the air pump 200, so as to control the operation of the motor of the air pump 200 and improve the reliability of the air pump 200 inflating the air storage cylinder 100. Of course, as long as at least one of the control circuit board 700 and the common collector circuit 830 outputs a low level, the logic AND gate circuit 840 outputs a low level to control the air pump 200 motor to stop and stop inflating the air storage cylinder 100.

[0021] The signal amplifying circuit 850 is used to amplify the control signal output by the logic AND gate circuit 840. In this embodiment, the signal amplifying circuit 850 includes a second transistor Q3 and a third transistor Q5 arranged in parallel and electrically connected to the logic AND gate circuit 840, and the emitter of the second transistor Q3 and the emitter of the third transistor Q5 are grounded respectively. The switch circuit 860 is used to realize the start and stop of the air pump 200 motor. In this embodiment, the switch circuit 860 includes a photoelectric coupler U5 electrically connected to the second transistor Q3 and the third transistor Q5, respectively, and a first relay K1 and a second relay K2 arranged in parallel and electrically connected to the photoelectric coupler U5, respectively, and the first relay K1 and the second relay K2 are both electrically connected to the air pump 200. Further preferably, the first relay and the second relay are both solid-state relays.

[0022] Please refer to Figure 2-4 In this embodiment, the pressure signal (Press Meterbottle) input by the pressure sensor 400 is divided by the voltage divider resistor R27, and then input into the voltage comparison chip U4 through the pin 3 of the voltage comparison chip U4. The voltage comparison chip U4 compares the pressure signal transmitted by the pressure sensor 400 with the internal reference voltage. When the pressure signal detected by the pressure sensor 400 is greater than the reference voltage, the voltage comparison chip U4 outputs a high level, otherwise it outputs a low level. After the level output by the voltage comparison chip U4 is inverted by the first transistor Q4, the logic AND gate circuit (not shown in the circuit schematic diagram) performs a logic AND on the inverted signal and the control signal Cylic ctl bottle output by the control circuit board 700, and then further inputs the processing result into the second transistor Q3 and the third transistor Q5 to control the on and off of the first relay K1 and the second relay K2. In this embodiment, the first relay K1 and the second relay K2 are electrically connected to the power supply of the air pump 200 through the relay J10, and the first relay K1 and the second relay K2 are also connected to the motor of the air pump 200 through the relay J11. In this way, according to the output of the photoelectric coupler, the overvoltage protection control circuit 800 can control the power supply of the air pump 200 to be turned off or the motor of the air pump 200 to be stopped, so as to ensure the safety of the air bag midwifery instrument. In this embodiment, by setting a voltage divider resistor, the resistance voltage divider ratio determines the critical pressure value of the air storage cylinder 100 to be protected. In actual use, the critical pressure value of the air storage cylinder 100 to be protected is slightly lower than the safety pressure value, so as to further improve the safety of the use of the air bag midwifery instrument.

[0023] The air bag obstetric instrument air cylinder inflation system 10 of the utility model is implemented by setting an overvoltage protection control circuit 800, which is connected to the pressure signal of the air cylinder 100 detected by the pressure sensor 400, and after the pressure signal is divided by the voltage divider circuit 810, the voltage comparison circuit 820 compares the pressure value of the cylinder with the standard pressure value, and outputs a high level when the cylinder pressure is higher than the standard pressure value. The high level is further transmitted to the common collector circuit 830, the signal amplification circuit 850 and the switch circuit 860 to control the air pump 200 to stop working, so as to achieve overpressure protection when the air cylinder 100 is inflated, avoid damage to the human body caused by excessive inflation pressure in the air bag 300, and improve the safety of the use of the air bag obstetric instrument.

[0024] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0025] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An air bag obstetric instrument air storage cylinder inflation system, characterized in that: It includes an air storage cylinder, an air pump for inflating the air storage cylinder, an airbag connected to the output end of the air storage cylinder, a pressure sensor for detecting the air pressure in the air storage cylinder, a first solenoid valve arranged on a pipeline connecting the air storage cylinder and the airbag, a second solenoid valve for controlling the opening or closing of the airbag, a control circuit board, and an overvoltage protection control circuit. The control circuit board is electrically connected to the pressure sensor, the first solenoid valve, the second solenoid valve and the overvoltage protection control circuit respectively. The overvoltage protection control circuit includes a voltage divider circuit electrically connected to the pressure sensor, a voltage comparison circuit electrically connected to the voltage divider circuit, a common collector circuit electrically connected to the voltage comparison circuit, a logic AND gate circuit electrically connected to the common collector circuit and the control circuit board, a signal amplification circuit electrically connected to the logic AND gate circuit, and a switch circuit electrically connected to the signal amplification circuit. The switch circuit is electrically connected to the air pump.

2. The air storage cylinder inflation system of the air bag obstetric instrument according to claim 1 is characterized in that: The voltage divider circuit includes a voltage divider resistor electrically connected to the output end of the pressure sensor.

3. The air storage cylinder inflation system of the air bag midwifery instrument according to claim 2 is characterized in that: The voltage comparison circuit includes a voltage comparison chip electrically connected to a voltage dividing resistor.

4. The air storage cylinder inflation system of the air bag obstetric instrument according to claim 3 is characterized in that: The common collector circuit comprises a first transistor, the base of the first transistor is electrically connected to the voltage comparison chip, the emitter of the first transistor is grounded, and the collector of the first transistor is electrically connected to the logic AND gate circuit.

5. The air storage cylinder inflation system of the air bag obstetric instrument according to claim 4 is characterized in that: The signal amplifying circuit comprises a second triode and a third triode which are arranged in parallel and electrically connected to the logic AND gate circuit, and the emitter of the second triode and the emitter of the third triode are grounded respectively.

6. The air storage cylinder inflation system of the air bag obstetric instrument according to claim 5, characterized in that: The switch circuit includes a photoelectric coupler electrically connected to the second transistor and the third transistor respectively, and a first relay and a second relay arranged in parallel and electrically connected to the photoelectric coupler respectively, and the first relay and the second relay are both electrically connected to the air pump.

7. The air storage cylinder inflation system of the air bag obstetric instrument according to claim 6, characterized in that: The first relay and the second relay are both solid-state relays.

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