Endoscope air supply control circuit and endoscope air supply device

Abstract

The utility model discloses an endoscope air supply control circuit and an endoscope air supply device, the endoscope air supply control circuit comprises a first detection module, a control module, a switch valve and an adjusting module, the first detection module comprises an air flow monitoring unit, an analog-to-digital conversion unit and a level conversion unit; a gas flow monitoring unit acquires a gas flow signal in a gas supply channel and converts the gas flow signal into a corresponding voltage, an analog-to-digital conversion unit converts the voltage into a digital signal, a level conversion unit performs level conversion on the digital signal and outputs the digital signal to a control module, and the control module controls the output voltage of an adjusting module according to the digital signal. According to the air supply system for the endoscope, the air supply flow is automatically adjusted, and the intelligent degree of the air supply system for the endoscope is improved.

Description

TECHNICAL FIELD

[0001] The utility model discloses endoscope product's gas supply flow control technology, especially relates to a kind of endoscope air supply control circuit and endoscope air supply device. BACKGROUND

[0002] Endoscope can assist physician to examine part (such as stomach, intestinal tract, trachea etc.) that naked eye cannot observe in human body, to facilitate doctor accurate diagnosis of illness, its clinical use demand is increasing day by day.In endoscope industry's endoscope product, endoscope air supply pump is as the matched equipment of endoscope use, market demand and endoscope demand amount are flat, and endoscope industry program same growth trend, become indispensable medical auxiliary equipment.

[0003] In gastroenterological diagnosis and treatment, it needs to inflate the lumen of the examinee to facilitate the insertion of endoscope and detailed observation. Since air is not easily absorbed by the mucosa, long-term injection of gas in the lumen can cause gastrointestinal distension, postoperative pain, abdominal pain, and even perforation. Carbon dioxide can be rapidly absorbed by the gastrointestinal mucosa, so how to control the gas flow of the endoscope air supply pump is of concern and favor to endoscopic physicians.

[0004] The existing endoscope gas circuit system generally includes a gas supply pump, a flow meter, a gas pressure sensor, a speed regulating valve, and an electromagnetic valve. During use, the physician observes the gas flow and pressure through the flow meter and gas pressure sensor. When the gas flow is not within the set range, the physician manually adjusts the opening of the speed regulating valve to control the gas flow. However, this method is inconvenient and not very intelligent. Therefore, the utility model provides an endoscope air supply control circuit and an endoscope air supply device. SUMMARY

[0005] In view of the shortcomings of the prior art, the utility model aims to provide an endoscope air supply control circuit and an endoscope air supply device that can automatically adjust the air supply flow.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions:

[0007] An endoscope air supply control circuit includes a first detection module, a control module, a switch valve, and an adjustment module. The first detection module includes a gas flow monitoring unit, an analog-to-digital conversion unit, and a level conversion unit. The gas flow monitoring unit obtains the gas flow signal in the air supply channel and converts it into a corresponding voltage. The analog-to-digital conversion unit converts the voltage into a digital signal. The level conversion unit performs level conversion and outputs the digital signal to the control module. The control module controls the output voltage of the adjustment module based on the digital signal to control the opening of the switch valve.

[0008] The endoscope gas supply control circuit, the first detection module further comprises a gas pressure detection unit and a shaping unit, the gas pressure detection unit detects the gas pressure data of the gas supply device, and the gas pressure data is shaped and amplified by the shaping unit and sent to the analog-digital conversion unit.

[0009] The endoscope gas supply control circuit further comprises a second detection module and a temperature control module, the second detection module detects the gas temperature and feeds back to the control module, and the control module controls the output power of the temperature control module according to the gas temperature.

[0010] The endoscope gas supply control circuit, the temperature control module comprises a temperature adjusting unit, a heating rod and a gas heating element, the second detection module and the gas heating element are arranged in the gas supply channel, the heating rod is connected with the gas heating element, and the control module is connected with the heating rod through the temperature adjusting unit.

[0011] The endoscope gas supply control circuit, the gas flow monitoring unit comprises a gas flow sensor, the analog-digital conversion unit comprises an analog-digital conversion chip, a first resistor, a second resistor and a first capacitor, the VOUT pin of the gas flow sensor is connected with the AIN0 pin of the analog-digital conversion chip through the first resistor, connected with the power supply end through the second resistor, and grounded through the first capacitor.

[0012] The endoscope gas supply control circuit, the gas pressure detection unit comprises a pressure sensor, the analog-digital conversion unit further comprises a third resistor, a fourth resistor and a second capacitor, the shaping unit comprises an operational amplifier, a fifth resistor and a third capacitor, the output end of the pressure sensor is connected with the non-inverting input end of the operational amplifier, the inverting input end of the operational amplifier is connected with the output end of the operational amplifier and one end of the fifth resistor, the other end of the fifth resistor is connected with the AIN3 pin of the analog-digital conversion chip through the third resistor, connected with the power supply end through the fourth resistor, and grounded through the second capacitor, and the third capacitor is connected with the fifth resistor in parallel.

[0013] The level conversion unit comprises a first conversion chip, a second conversion chip, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor and an eleventh resistor, a B2 pin of the first conversion chip is connected with a SCLK pin of the analog-digital conversion chip through the sixth resistor, a B1 pin of the first conversion chip is connected with a DOUT pin of the analog-digital conversion chip through the seventh resistor, a B2 pin of the second conversion chip is connected with a CS pin of the analog-digital conversion chip through the eighth resistor, a B1 pin of the second conversion chip is connected with a DIN pin of the analog-digital conversion chip through the ninth resistor, an A1 pin of the first conversion chip is connected with the control module through the tenth resistor, and an A1 pin of the second conversion chip is connected with the control module through the eleventh resistor.

[0014] The adjusting module comprises a twelfth resistor, a thirteenth resistor and a fourteenth resistor, one end of the twelfth resistor is connected with the control module, the other end of the twelfth resistor is connected with a first power module, also connected with the switch valve through the thirteenth resistor and connected with the ground through the fourteenth resistor.

[0015] The temperature adjusting unit comprises a fifteenth resistor, a sixteenth resistor and a seventeenth resistor, one end of the fifteenth resistor is connected with the control module, the other end of the fifteenth resistor is connected with a second power module, also connected with the heating rod through the sixteenth resistor and connected with the ground through the seventeenth resistor.

[0016] The utility model also provides a endoscope air feeding device, it includes gas supply bottle, air feeding pipeline and endoscope air feeding control circuit, gas supply bottle is connected with air feeding pipeline, and the first detection module of endoscope air feeding control circuit is connected with gas supply bottle and air feeding pipeline.

[0017] Compared with the prior art, the endoscope air feeding control circuit provided by the utility model obtains the gas flow signal in the air feeding channel by the gas flow monitoring unit and converts it into the corresponding voltage, converts it into the digital signal by the analog-digital conversion unit, and then outputs it to the control module after level conversion by the level conversion unit, the control module controls the output voltage of the adjusting module according to the digital signal, so as to control the opening degree of the switch valve, realizes the automatic regulation of the air feeding flow, and improves the intelligent degree of the endoscope air supply system. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The utility model provides the structure block diagram of endoscope air feeding control circuit.

[0019] Figure 2 The utility model provides the circuit principle drawing of gas flow monitoring unit, analog-digital conversion unit, gas pressure detection unit, whole single unit in endoscope air feeding control circuit.

[0020] Figure 3 The utility model provides a circuit principle drawing of level conversion unit in endoscope air supply control circuit.

[0021] Figure 4 The utility model provides a circuit principle drawing of control module in endoscope air supply control circuit.

[0022] Figure 5 The utility model provides a circuit principle drawing of adjusting module in endoscope air supply control circuit.

[0023] Figure 6 The utility model provides a circuit principle drawing of temperature adjusting unit in endoscope air supply control circuit.

[0024] BRIEF DESCRIPTION OF DRAWINGS

[0025] First detection module 10, gas flow monitoring unit 11, AD conversion unit 12, level conversion unit 13, gas pressure detection unit 14, integral unit 15, control module 20, switch valve 30, adjusting module 40, alarm module 50, display screen 60, second detection module 70, temperature control module 80, foot switch 90, interface board 100, temperature adjusting unit 81, heating stick 82, gas heating spare 83, control chip U01, connector J1, gas flow sensor U1, AD conversion chip U2, first resistance R1, second resistance R2, first capacitor C1, third resistance R3, fourth resistance R4, second capacitor C2, operational amplifier A1, fifth resistance R5, third capacitor C3, first conversion chip U3, second conversion chip U4, sixth resistance R6, seventh resistance R7, eighth resistance R8, ninth resistance R9, tenth resistance R10, eleventh resistance R11, twelfth resistance R12, thirteenth resistance R13, fourteenth resistance R14, fifteenth resistance R15, sixteenth resistance R16, seventeenth resistance R17 DETAILED DESCRIPTION

[0026] In order to make the utility model purposes, technical scheme and advantages more clearly, following combining with the drawings and example, this utility model is further detailedly explained. Should understand, the specific example described here is only used to explain the utility model, and is not used to limit the utility model.

[0027] The endoscope gas supply control circuit provided by the utility model is mainly used in matched use with electronic endoscopes, and is used for assisting the supply of carbon dioxide gas (CO2) in endoscopic surgery of medical institutions, for injecting carbon dioxide into the body of a subject through an endoscope, and facilitating the observation and treatment of the electronic endoscope. The utility model can filter impurities in the CO2 gas output by a gas source (such as a gas cylinder) through a gas supply device (such as a gas pump), and control the output of the CO2 gas after two-stage pressure reduction through a solenoid valve. The control circuit of the utility model can control the gas output rating to be about 45KPa suitable for endoscopic surgery, so as to realize the functions of CO2 gas pressure reduction, accurate flow detection, adjustable flow size, constant temperature preheating, accurate timing, pressure overrun alarm and the like.

[0028] Please refer to Figure 1 The endoscope gas supply control circuit provided by the utility model comprises a first detection module 10, a control module 20, a switch valve 30 and an adjusting module 40, and the first detection module 10, the switch valve 30 and the adjusting module 40 are connected with the control module 20. The gas output by a gas cylinder is sent into a gas supply pipeline through a pressure transmitter, and the detection part of the first detection module 10 is arranged in a gas supply channel (such as a gas supply pipeline), so that the gas pressure and flow can be monitored.

[0029] In the embodiment, the first detection module 10 detects the gas flow signal of the gas supply equipment, converts the gas flow signal into a digital signal and sends the digital signal to the control module 20, the control module 20 controls the output voltage of the adjusting module 40 according to the digital signal, controls the opening degree of the switch valve 30, that is, the opening degree, and realizes the carbon dioxide gas supply control.

[0030] Please refer to Figures 2 to 4 The first detection module 10 comprises a gas flow monitoring unit 11, an analog-digital conversion unit 12 and a level conversion unit 13, the gas flow monitoring unit 11, the analog-digital conversion unit 12, the level conversion unit 13 and the control module 20 are connected in sequence, the gas flow signal in the gas supply channel is acquired by the gas flow monitoring unit 11 and is converted into a corresponding voltage, is converted into a digital signal by the analog-digital conversion unit 12, is generally a 5V digital signal at this time, is converted into a 3.3V digital signal by the level conversion unit 13, and communicates with the control module 20 through an SPI communication mode.

[0031] Further, the first detection module 10 further comprises a gas pressure detection unit 14 and a shaping unit 15, the gas pressure detection unit 14 is connected with the analog-digital conversion unit 12 through the shaping unit 15, the gas pressure detection unit 14 detects the gas pressure data of the gas supply equipment, and the gas pressure data is shaped and amplified by the shaping unit 15 and is sent to the analog-digital conversion unit 12.

[0032] The air pressure detection unit 14 collects and converts the air pressure of the carbon dioxide output by the pressure transmitter into corresponding voltage, and the voltage is shaped and enhanced by the shaping unit 15 and converted into a digital signal by the analog-digital conversion unit 12, and then converted by the level conversion unit 13 and sent to the control module 20.

[0033] Further, the endoscope air supply control circuit provided by the utility model further comprises an alarm module 50 and a display screen 60, the alarm module 50 and the alarm module 50 are connected with the control module 20, when the gas pressure detected by the first detection module 10 exceeds or is lower than the set pressure range, the control module 20 makes the alarm module 50 output alarm information, and makes the display screen 60 display corresponding pressure data.

[0034] The display screen 60 can be connected with the control module 20 through a serial port, and is used for displaying the pressure collected by the air pressure detection unit 14, the high air pressure and the low air pressure of the set pressure range, and can also display the gas flow collected by the gas flow monitoring unit 11, an alarm signal and the like.

[0035] Please continue to refer to Figures 1 to 4 The control module 20 can comprise a control chip U01 and peripheral electronic elements thereof, wherein the control chip U01 can adopt a microprocessor of STM32F46VET6, the IO port of the microprocessor is rich, the function expansion is convenient, SPI communication is adopted between the microprocessor and the level conversion unit 13, and the communication response speed is fast. The PA2 pin of the control chip U01 is connected with the alarm module 50, the alarm module 50 can adopt a buzzer, and a group of USART ports of the control chip U01 are connected with the display screen 60.

[0036] The gas flow monitoring unit 11 comprises a gas flow sensor U1, the gas flow sensor U1 can adopt a pressure sensor of MPXV5050DP, is a piezoresistive sensor, can provide an accurate high-level analog output signal, the analog voltage is proportional to the applied pressure, the utility model can divide the analog voltage output by the gas flow sensor U1 into multiple levels, each level corresponds to corresponding gas flow, and a corresponding table of voltage levels and gas flow can be stored in the control chip U01, when the control chip U01 obtains the voltage feedback by the gas flow sensor U1, the corresponding gas flow can be known.

[0037] The analog-digital conversion unit 12 comprises an analog-digital conversion chip U2, a first resistor R1, a second resistor R2 and a first capacitor C1, the analog-digital conversion chip U2 can adopt an analog-digital converter of ADS1118IDGS, is an AD converter with small size and low power consumption, has an SPI interface and two groups of analog signal input ends (AIN0 and AIN2), and can carry out analog-digital conversion on two groups of analog data.

[0038] The first resistor R1 is a voltage dividing resistor, which prevents the voltage input to the analog-digital conversion chip U2 from being too high to damage the analog-digital conversion chip U2, the first capacitor C1 is a filter capacitor, which stabilizes the voltage input to the analog-digital conversion chip U2, and the second resistor R2 is a pull-up resistor, which pulls the AIN0 pin of the analog-digital conversion chip U2 to a high level of 5V.

[0039] The VOUT pin of the gas flow sensor U1 is connected to the AIN0 pin of the analog-digital conversion chip U2 through the first resistor R1, to the power supply end through the second resistor R2, and to the ground through the first capacitor C1. The power supply end can be a DVCC+5V voltage provided by an endoscope power supply. When the gas flow sensor U1 detects a gas flow signal, it outputs a corresponding analog voltage from the VOUT pin to the AIN0 pin of the analog-digital conversion chip U2, which converts it into a digital signal and outputs it to the level conversion unit 13 through the SCLK pin, the CS pin, the DIN pin, and the DOUT pin of the analog-digital conversion chip U2. The level conversion unit 13 converts the digital signal into a 3.3V SPI signal, which is then communicated to the control chip U01 through the level conversion unit 13. The control chip U01 processes the collected data (e.g., finds the corresponding quantity data according to the voltage value) and then causes the display screen 60 to display the data. If the recognized flow rate is lower than the lowest value of the set flow rate range or higher than the highest value of the set flow rate range, an alarm is triggered.

[0040] Please continue to refer to Figures 1 to 4 The gas pressure detection unit 14 includes a pressure sensor, which can be a 3100H30CPS05B000 pressure sensor. The pressure sensor is an external device and is electrically connected to the integration unit 15 through the connector J1. The connector J1 can be a B03B-PASK connector. The first pin of the connector J1 is the output pin of the pressure sensor, the second pin is connected to the ground, and the third pin is connected to a 15V power supply end. The pressure sensor is also connected to the ground through a capacitor, which stabilizes the power supply of the pressure sensor and ensures stable and reliable operation of the pressure sensor.

[0041] The analog-digital conversion unit 12 also includes a third resistor R3, a fourth resistor R4, and a second capacitor C2. The third resistor R3 is a voltage dividing resistor, which prevents the voltage input to the analog-digital conversion chip U2 from being too high to damage the analog-digital conversion chip U2. The second capacitor C2 is a filter capacitor, which stabilizes the voltage input to the analog-digital conversion chip U2. The fourth resistor R4 is a pull-up resistor, which pulls the AIN0 pin of the analog-digital conversion chip U2 to a high level of 5V.

[0042] The shaping unit 15 includes an operational amplifier A1, a fifth resistor R5 and a third capacitor C3, the operational amplifier A1 is used as a voltage follower, mainly for shaping and amplifying the voltage output by the pressure sensor, the fifth resistor R5 and the third capacitor C3 constitute an RC filter circuit to filter out noise and make the output signal of the operational amplifier A1 stable.

[0043] In this embodiment, the output end of the pressure sensor is connected to the non-inverting input end of the operational amplifier A1, the inverting input end of the operational amplifier A1 is connected to the output end of the operational amplifier A1 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the AIN3 pin of the analog-to-digital conversion chip U2 through the third resistor R3, also connected to the power supply end through the fourth resistor R4, and grounded through the second capacitor C2, and the third capacitor C3 is connected in parallel with the fifth resistor R5.

[0044] The analog voltage output by the pressure sensor is sent to the AIN3 pin of the analog-to-digital conversion chip U2 after being shaped and amplified by the operational amplifier A1, and then converted into a digital signal, and then output from the SCLK pin, CS pin, DIN pin and DOUT pin of the analog-to-digital conversion chip U2 to the level conversion unit 13, and converted into an SPI signal by the level conversion unit 13, and then communicated with the control chip U01 through the level conversion unit 13, and the control chip U01 displays the air pressure on the display screen 60 according to the collected data, and alarms when the recognized air pressure is lower than the low air pressure value of the set air pressure range or higher than the high air pressure value of the set air pressure range.

[0045] Please refer to Figures 1 to 4 , the level conversion unit 13 includes a first conversion chip U3, a second conversion chip U4, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10 and an eleventh resistor R11, all of which are current limiting resistors to prevent excessive current from damaging the first conversion chip U3 and the second conversion chip U4.

[0046] The B2 pin of the first conversion chip U3 is connected to the SCLK pin of the analog-digital conversion chip U2 through the sixth resistor R6, the B1 pin of the first conversion chip U3 is connected to the DOUT pin of the analog-digital conversion chip U2 through the seventh resistor R7, the B2 pin of the second conversion chip U4 is connected to the CS pin of the analog-digital conversion chip U2 through the eighth resistor R8, the B1 pin of the second conversion chip U4 is connected to the DIN pin of the analog-digital conversion chip U2 through the ninth resistor R9, the A1 pin of the first conversion chip U3 is connected to the control module 20 (such as the PA6 pin of the control chip U01) through the tenth resistor R10, the A1 pin of the second conversion chip U4 is connected to the control module 20 (such as the PA7 pin of the control chip U01) through the eleventh resistor R11, the A2 pin of the first conversion chip U3 is connected to the PA5 pin of the control chip U01, and the A2 pin of the second conversion chip U4 is connected to the PA4 pin of the control chip U01.

[0047] Optionally, the first conversion chip U3 and the second conversion chip U4 can both adopt a TXS0102DCUR bidirectional voltage level converter, which is mainly used for converting the digital signal output by the analog-digital converter into an SPI signal for reading and processing by the control chip U01. After the control chip U01 obtains the air pressure data and the air flow data through the SPI bus, the control adjustment module 40 performs corresponding processing. For example, when the air flow is too large, the control adjustment module 40 reduces the output power to reduce the air flow. For another example, when the air source pressure is too high, the output pressure of the pressure transmitter at the bottle mouth of the gas supply bottle is adjusted to reduce the air pressure of the air supply channel.

[0048] Please refer to Figure 5 , the adjustment module 40 includes a twelfth resistor R12, a thirteenth resistor R13 and a fourteenth resistor R14, one end of the twelfth resistor R12 is connected to the control module 20 (such as the PA0 pin of the control chip U01), the other end of the twelfth resistor R12 is connected to the first power module, also connected to the on-off valve 30 through the thirteenth resistor R13, and further connected to the ground through the fourteenth resistor R14.

[0049] Optionally, the switch valve 30 is an electromagnetic valve, and the suction state of the electromagnetic valve coil can be changed by changing the power supply voltage of the electromagnetic valve, so as to control the gas delivery flow. One end of the twelfth resistor R12 can be connected to the PA0 pin of the control chip U01, and an accurate external voltage is provided by the control chip U01. The twelfth resistor R12, the thirteenth resistor R13 and the fourteenth resistor R14 constitute a voltage regulating circuit. The power supply module includes a power supply chip, such as a DC-DC chip with model number TPS54331DDAR, which has two voltage output ends, namely a voltage output end and a reference voltage output end, which provide voltages for the thirteenth resistor R13 and the twelfth resistor R12, respectively. The control chip U01 outputs a corresponding voltage from the PA0 pin according to the obtained gas flow, so as to adjust the working voltage of the electromagnetic valve, control the suction degree of the electromagnetic valve coil, control the opening degree of the electromagnetic valve, and control the gas flow. The output voltage of the adjusting module 40 is obtained by the following formula:

[0050] V OUT1 =R 13 [0.8 / R 14 -(V DAC1 -0.8) / R 12 ]

[0051] Where, V DAC1 is the output voltage of the PA0 pin of the control chip U01, R 12 is the resistance value of the twelfth resistor R12, R 13 is the resistance value of the thirteenth resistor R13, and R 14 is the resistance value of the fourteenth resistor R14.

[0052] The utility model discloses the power size of electromagnetic valve is adjusted by adjusting the supply voltage of electromagnetic valve, that is, the opening size (such as the valve core suction degree) of electromagnetic valve is controlled, so as to control the gas flow size, to increase the gas flow control precision.

[0053] Please continue to refer to Figure 1 And Figure 6 The endoscope gas supply control circuit also includes a second detection module 70 and a temperature control module 80, the second detection module 70 is connected to the control module 20 through the temperature control module 80, the second detection module 70 detects the gas temperature and feeds back to the control module 20, the control module 20 controls the output power of the temperature control module 80 according to the gas temperature.

[0054] The temperature control module 80 comprises a temperature regulating unit 81, a heating rod 82 and a gas heating element 83, the second detection module 70 and the gas heating element 83 are arranged in the gas delivery channel, the heating rod 82 is connected with the gas heating element 83, and the control module 20 is connected with the heating rod 82 through the temperature regulating unit 81.

[0055] Optionally, the second detection module 70 can adopt a temperature sensor, and the gas heating element 83 can adopt a copper sheet or copper wire with good heat conduction performance, which is closely attached or wound on the heating rod 82. The heating rod 82 generates heat, which is quickly conducted to the gas heating element 83, so as to heat the carbon dioxide gas flowing through the gas delivery channel.

[0056] The temperature regulating unit 81 comprises a fifteenth resistor R15, a sixteenth resistor R16 and a seventeenth resistor R17. One end of the fifteenth resistor R15 is connected with the control module 20 (such as the PD10 pin of the control chip U01), the other end of the fifteenth resistor R15 is connected with a second power module (the second power module has the same circuit structure as the first power module), also connected with the heating rod 82 through the sixteenth resistor R16, and grounded through the seventeenth resistor R17.

[0057] The output power of the heating rod 82 is changed by changing the power supply voltage of the heating rod 82, that is, the heating temperature of the heating rod 82 is changed. One end of the fifteenth resistor R15 can be connected with the PD10 pin of the control chip U01, and an accurate external voltage is provided by the control chip U01. The fifteenth resistor R15, the sixteenth resistor R16 and the seventeenth resistor R17 constitute a voltage regulating circuit. The second power module has two voltage output ends, that is, a voltage output end and a reference voltage output end, which respectively provide voltages for the sixteenth resistor R16 and the fifteenth resistor R15. The control chip U01 outputs a corresponding voltage according to the obtained temperature value, so as to adjust the working voltage of the heating rod 82 and perform temperature control. The output voltage of the temperature regulating unit 81 is obtained by the following formula:

[0058] V OUT2 =R 16 [0.8 / R 17 -(V DAC2 -0.8) / R 15 ]

[0059] Wherein, V DAC2 is the output voltage of the PD10 pin of the control chip U01, R 15 is the resistance value of the fifteenth resistor R15, R 16 is the resistance value of the sixteenth resistor R16, and R 17 is the resistance value of the seventeenth resistor R17.

[0060] The current gas temperature is detected by a temperature sensor, and after the control chip U01 obtains the temperature data, the power of the heating rod 82 is adjusted by adjusting the voltage supplied to the heating rod 82 to control the temperature of the heating rod 82, so as to control the gas temperature, and the gas temperature is maintained stable, and the gas temperature is displayed through the display screen 60, and the super high temperature and the super low temperature are alarmed through the alarm module 50.

[0061] Optionally, the endoscope gas supply control circuit can be arranged on or connected to a driving board (not shown in the figure) and an interface board 100, wherein the first detection module 10, the control module 20, the adjusting module 40 and the like can be arranged on the driving board of the endoscope, and the external devices can be electrically connected to the driving board through the interface board 100, so that the spatial arrangement of the electrical part of the endoscope can be facilitated.

[0062] Further, the endoscope gas supply control circuit further comprises a foot switch 90, the foot switch 90 is connected with the interface board 100, the interface board 100 is connected with the driving board through a wire harness, and the start and end of the gas supply can be controlled through the foot switch 90, so that the hands of the doctor can be freed for the cavity examination work, and the operation is convenient.

[0063] In order to better understand the technical scheme of the utility model, the following takes the anesthesia machine as an application example, and combines the working principle of the anesthesia machine Figure 2 and Figure 3 The endoscope gas supply control circuit will be described in detail:

[0064] When the foot switch 90 is stepped on, the electromagnetic valve and the pressure transmitter are opened, the gas output by the gas cylinder is sent into the gas supply pipeline through the pressure transmitter, the gas flow is obtained by the gas flow sensor U1 and a corresponding voltage is generated, then the voltage is converted into a corresponding digital signal in the analog-digital conversion chip U2 through the first resistor R1, and then the SPI signal is sent to the control chip U01 through the first conversion chip U3 and the second conversion chip U4, after the control chip U01 obtains the gas flow, it is judged whether the gas flow is in the set range, when the gas flow is greater than the upper limit of the set value, the output voltage of the PA0 pin is used to reduce the output voltage of the adjusting module 40, so as to reduce the opening of the electromagnetic valve and reduce the gas flow, and the display screen 60 displays the corresponding gas flow data; when the gas flow is less than the lower limit of the set value, the output voltage of the PA0 pin is used to increase the output voltage of the adjusting module 40, so as to increase the opening of the electromagnetic valve and increase the gas flow; and when the gas flow is greater than or less than the set range, the PA2 pin of the control chip U01 outputs a high level to make the buzzer alarm.

[0065] Meanwhile, the analog voltage output by the pressure sensor is sent to the AIN3 pin of the analog-digital conversion chip U2 after being shaped and amplified by the operational amplifier A1, converted into a digital signal, and then output to the first conversion chip U3 and the second conversion chip U4 through the SCLK pin, the CS pin, the DIN pin and the DOUT pin of the analog-digital conversion chip U2, and sent to the control chip U01 after SPI signal transmission, so that the control chip U01 displays the air source air pressure on the display screen 60 according to the collected data, and alarms when the identified air pressure is lower than the low air pressure value of the set air pressure range or higher than the high air pressure value of the set air pressure range, and displays the corresponding pressure value on the display screen 60.

[0066] When the gas supply bottle outputs gas, the second detection module 70 acquires temperature data and converts the temperature data into a corresponding voltage signal and sends the voltage signal to the PE9 pin of the control chip U01, so that the control chip U01 identifies whether the temperature data is within a set range; if the temperature data is higher than the upper limit of the set range, the control chip U01 outputs a corresponding voltage through the PD10 pin to change the output voltage, i.e., V OUT2 value, of the temperature adjusting unit 81, so as to adjust the power supply voltage of the heating rod 82 and thus adjust the temperature of the gas.

[0067] The utility model also provides a endoscope air supply device, it includes gas supply bottle, air supply pipeline and endoscope air supply control circuit, gas supply bottle is connected with air supply pipeline, the first detection module of endoscope air supply control circuit is connected with gas supply bottle and air supply pipeline, is used for obtaining the air pressure of gas supply bottle output and the gas flow data in air supply pipeline, and adjusts air pressure and gas flow in real time. Since the endoscope air supply control circuit has been described in detail above, no further description is given here.

[0068] In summary, the endoscope air supply control circuit provided by the utility model detects the gas flow signal of the gas supply equipment through the first detection module, converts the gas flow signal into a digital signal and sends the digital signal to the control module, the control module controls the output voltage of the adjusting module according to the digital signal to control the opening degree of the on-off valve, so that the air supply flow is automatically adjusted and the intelligent degree of the endoscope air supply system is improved.

[0069] At the same time, the utility model also monitors the pressure of the gas cylinder and the gas temperature in the air supply channel in real time, and automatically adjusts the gas pressure and temperature to a set range, further improving the intelligent degree of the endoscope product. Moreover, the utility model also has the functions of alarming and real-time display.

[0070] It can be understood that, for those skilled in the art, equivalent replacement or change can be made according to the technical scheme and the utility model concept of the utility model, and all these changes or replacements shall belong to the protection scope of the claims attached to the utility model.

Claims

1. An endoscopic insufflation control circuit, comprising: The device comprises a first detection module, a control module, a switch valve and an adjusting module, the first detection module comprises a gas flow monitoring unit, an analog-digital conversion unit and a level conversion unit, the gas flow monitoring unit obtains the gas flow signal in the gas supply channel and converts it into corresponding voltage, the analog-digital conversion unit converts it into digital signal, and the level conversion unit converts the digital signal into level signal and outputs it to the control module, the control module controls the output voltage of the adjusting module according to the digital signal to control the opening degree of the switch valve.

2. The endoscopic insufflation control circuit of claim 1, wherein, The first detection module further comprises a gas pressure detection unit and a shaping unit, the gas pressure detection unit detects the gas pressure data of the gas supply device, and the shaping unit shapes, amplifies and sends the gas pressure data to the analog-digital conversion unit.

3. The endoscopic insufflation control circuit of claim 1, wherein, The device further comprises a second detection module and a temperature control module, the second detection module detects the gas temperature and feeds it back to the control module, and the control module controls the output power of the temperature control module according to the gas temperature.

4. The endoscopic insufflation control circuit of claim 3, wherein, The temperature control module comprises a temperature adjusting unit, a heating rod and a gas heating element, the second detection module and the gas heating element are arranged in the gas supply channel, the heating rod is connected with the gas heating element, and the control module is connected with the heating rod through the temperature adjusting unit.

5. The endoscopic insufflation control circuit of claim 2, wherein, The gas flow monitoring unit comprises a gas flow sensor, the analog-digital conversion unit comprises an analog-digital conversion chip, a first resistor, a second resistor and a first capacitor, the VOUT pin of the gas flow sensor is connected with the AIN0 pin of the analog-digital conversion chip through the first resistor, connected with the power supply end through the second resistor and grounded through the first capacitor.

6. The endoscopic insufflation control circuit of claim 5, wherein, The gas pressure detection unit comprises a pressure sensor, the analog-digital conversion unit further comprises a third resistor, a fourth resistor and a second capacitor, the shaping unit comprises an operational amplifier, a fifth resistor and a third capacitor, the output end of the pressure sensor is connected with the non-inverting input end of the operational amplifier, the inverting input end of the operational amplifier is connected with the output end of the operational amplifier and one end of the fifth resistor, the other end of the fifth resistor is connected with the AIN3 pin of the analog-digital conversion chip through the third resistor, connected with the power supply end through the fourth resistor and grounded through the second capacitor, and the third capacitor is connected with the fifth resistor in parallel.

7. The endoscopic insufflation control circuit of claim 5, wherein, The level conversion unit comprises a first conversion chip, a second conversion chip, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor and an eleventh resistor, the B2 pin of the first conversion chip is connected with the SCLK pin of the analog-digital conversion chip through the sixth resistor, the B1 pin of the first conversion chip is connected with the DOUT pin of the analog-digital conversion chip through the seventh resistor, the B2 pin of the second conversion chip is connected with the CS pin of the analog-digital conversion chip through the eighth resistor, the B1 pin of the second conversion chip is connected with the DIN pin of the analog-digital conversion chip through the ninth resistor, the A1 pin of the first conversion chip is connected with the control module through the tenth resistor, and the A1 pin of the second conversion chip is connected with the control module through the eleventh resistor.

8. The endoscopic insufflation control circuit of claim 1, wherein, The adjusting module comprises a twelfth resistor, a thirteenth resistor and a fourteenth resistor, one end of the twelfth resistor is connected with the control module, the other end of the twelfth resistor is connected with a first power module, is also connected with a switch valve through the thirteenth resistor, and is further connected with the ground through the fourteenth resistor.

9. The endoscopic insufflation control circuit of claim 4, wherein, The temperature adjusting unit comprises a fifteenth resistor, a sixteenth resistor and a seventeenth resistor, one end of the fifteenth resistor is connected with the control module, the other end of the fifteenth resistor is connected with a second power module, is also connected with a heating rod through the sixteenth resistor, and is further connected with the ground through the seventeenth resistor.

10. An endoscopic gas insufflation device, comprising: The endoscope gas supply control circuit comprises a gas supply bottle, a gas supply pipeline and the endoscope gas supply control circuit according to any one of claims 1-9, the gas supply bottle is connected with the gas supply pipeline, and the first detection module of the endoscope gas supply control circuit is connected with the gas supply bottle and the gas supply pipeline.

Images