CN220385111U - Pneumoperitoneum machine pressure detection device - Google Patents

Abstract

The utility model discloses a pneumoperitoneum machine pressure detection device, which comprises a main control circuit, an output pressure detection circuit and an input pressure detection circuit; the output pressure detection circuit is arranged at the air outlet of the air channel of the pneumoperitoneum machine, and the input pressure detection circuit is arranged at the air inlet of the air channel of the pneumoperitoneum machine; the output pressure detection circuit and the input pressure detection circuit are electrically connected with the main control circuit. The utility model can detect the pressure condition of the whole gas path output and the pressure condition of the gas which is transmitted to the pneumoperitoneum machine by the gas source, and the main control circuit can synthesize the detection results of the two pressures to analyze, thereby grasping the pressure state of the whole pneumoperitoneum machine, realizing more comprehensive pressure detection and high reliability and really ensuring the safety of gas transmission.

Description

Pneumoperitoneum machine pressure detection device

Technical Field

The utility model relates to the field of medical equipment, in particular to a pneumoperitoneum machine pressure detection device.

Background

During laparoscopic surgery, an operation space needs to be established in the abdominal cavity, which needs to beTo be infused with gas (commonly referred to as CO) ₂ Gas) to raise the anterior abdominal wall for good vision and for operation with the instrument. Pneumoperitoneum machines are devices necessary for establishing and maintaining pneumoperitoneum.

In the use process of the pneumoperitoneum machine, in order to ensure the safety of the poured gas after entering the human body, the pressure in the gas path of the pneumoperitoneum machine needs to be monitored and fed back in real time so as to realize the use safety of gas delivery. Thus, a pressure detecting device is typically provided for the pneumoperitoneum machine.

However, the current pressure detection device generally only detects the pressure at the air outlet of the air channel, and the pressure at the air inlet of the air channel also has an influence on the safety of gas delivery, so that the reliability of the existing pressure detection device is lower, and the safety of gas delivery cannot be really ensured.

Disclosure of Invention

In view of the above, the present utility model provides a pressure detection device for a pneumoperitoneum machine, so as to solve the problem that the reliability of pressure detection is low due to the fact that the existing pressure detection device only detects the pressure at the air outlet.

The utility model provides a pneumoperitoneum machine pressure detection device, which comprises a main control circuit, an output pressure detection circuit and an input pressure detection circuit;

the output pressure detection circuit is arranged at the air outlet of the air channel of the pneumoperitoneum machine, and the input pressure detection circuit is arranged at the air inlet of the air channel of the pneumoperitoneum machine;

the output pressure detection circuit and the input pressure detection circuit are electrically connected with the main control circuit.

Optionally, the output pressure detection circuit comprises a first power supply electronic circuit and two identical pressure acquisition sub-circuits;

the input ends of the two pressure acquisition sub-circuits are electrically connected with the output end of the first power supply circuit, and the output ends of the two pressure acquisition sub-circuits are electrically connected with the main control circuit.

Optionally, the first power supply electronic circuit includes a first dual-channel operational amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a seventh capacitor;

the positive power supply pin +VS of the first dual-channel operational amplifier is electrically connected with the +12V power supply end through the first resistor, the first end of the second capacitor is connected to the common connection end between the positive power supply pin +VS of the first dual-channel operational amplifier and the first resistor, the second end of the second capacitor is grounded, and the negative power supply pin-VS of the first dual-channel operational amplifier is grounded;

the first positive electrode signal input pin +IN/A and the second positive electrode signal input pin +IN/B of the first dual-channel operational amplifier are electrically connected with the +3V power supply end; the first end of the sixth capacitor is connected to a common connection end between a first positive signal input pin +IN/A of the first dual-channel operational amplifier and the +3V power supply end, and the second end of the sixth capacitor is grounded; the first end of the seventh capacitor is connected to a common connection end between the second positive signal input pin +IN/B of the first dual-channel operational amplifier and the +3V power supply end, and the second end of the seventh capacitor is grounded;

The first negative electrode signal input pin-IN/A of the first dual-channel operational amplifier is electrically connected with the input end of the first path of pressure acquisition subcircuit, and the first negative electrode signal input pin-IN/A of the first dual-channel operational amplifier is grounded through the fourth resistor; the second negative electrode signal input pin-IN/B of the first dual-channel operational amplifier is electrically connected with the input end of the second pressure acquisition sub-circuit, and the second negative electrode signal input pin-IN/B of the first dual-channel operational amplifier is grounded through the fifth resistor;

the first output pin OUT/A of the first dual-channel operational amplifier is grounded through the second resistor and the first capacitor IN sequence, the input end of the first path of pressure acquisition subcircuit is also connected to a common connection end between the second resistor and the first capacitor, the first end of the fourth capacitor is connected to the common connection end between the first output pin OUT/A of the first dual-channel operational amplifier and the second resistor, and the second end of the fourth capacitor is connected to the common connection end between the first negative electrode signal input pin-IN/A of the first dual-channel operational amplifier and the fourth resistor;

the second output pin OUT/B of the first dual-channel operational amplifier sequentially passes through the third resistor and the third capacitor to be grounded, the input end of the second pressure acquisition sub-circuit is further connected to a common connection end between the third resistor and the third capacitor, the first end of the fifth capacitor is connected to the common connection end between the second output pin OUT/B of the first dual-channel operational amplifier and the third resistor, and the second end of the fifth capacitor is connected to the common connection end between the second negative electrode signal input pin IN/B of the first dual-channel operational amplifier and the fifth resistor.

Optionally, the two pressure acquisition subcircuits each include a first pressure sensor, a first operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, and a first bidirectional diode;

in each pressure acquisition sub-circuit, a positive electrode pin LEXC+ of a power supply circuit and a negative electrode pin LEXC-of the power supply circuit of the first pressure sensor are electrically connected with the output end of the first power supply circuit; the signal output positive electrode pin SIG+ of the first pressure sensor is electrically connected with the positive input pin of the first operational amplifier, the first end of the eighth capacitor is connected to the common connection end between the signal output positive electrode pin SIG+ of the first pressure sensor and the positive input pin of the first operational amplifier, and the second end of the eighth capacitor is grounded; the signal output negative electrode pin SIG-of the first pressure sensor is electrically connected with the inverting input pin of the first operational amplifier, the first end of the ninth capacitor is connected to the common connection end between the signal output negative electrode pin SIG-of the first pressure sensor and the inverting input pin of the first operational amplifier, and the second end of the ninth capacitor is grounded;

The positive power pin of the first operational amplifier is electrically connected with a +12V power end through the ninth resistor, the first end of the eleventh capacitor is connected to a common connection end between the positive power pin of the first operational amplifier and the ninth resistor, and the second end of the eleventh capacitor is grounded; the reference voltage power supply pin of the first operational amplifier is electrically connected with a +0.11V power supply end, the grounding pin of the first operational amplifier is grounded, and the first gain pin of the first operational amplifier is electrically connected with the second gain pin of the first operational amplifier through the eighth resistor; the output pin of the first operational amplifier is electrically connected with the input end of the main control circuit through the sixth resistor, the first end of the seventh resistor and the first end of the tenth capacitor are both connected to a common connection end between the sixth resistor and the input end of the main control circuit, and the second end of the seventh resistor and the second end of the tenth capacitor are both grounded;

the first anode of the first bidirectional diode is electrically connected with the +3.3V power supply end, the second anode of the first bidirectional diode is grounded, and the cathode of the first bidirectional diode is connected to the common connection end between the sixth resistor and the input end of the main control circuit.

Optionally, the input pressure detection circuit includes a second power supply electronic circuit, a second pressure sensor, an operational amplifier sub-circuit, a pressure output sub-circuit, and a connector having 7 pins;

the No. 4 pin and the No. 5 pin of the connector are electrically connected with the output end of the second pressure sensor, the No. 6 pin and the No. 7 pin of the connector are also electrically connected with the output end of the second power supply electronic circuit, the No. 4 pin and the No. 5 pin of the connector are also electrically connected with the input end of the operational amplifier sub-circuit, the input end of the operational amplifier sub-circuit is also electrically connected with the output end of the second power supply electronic circuit, and the output end of the operational amplifier sub-circuit is electrically connected with the input end of the main control circuit through the pressure output sub-circuit; the No. 1 pin, the No. 2 pin and the No. 3 pin of the connector are all suspended.

Optionally, the second power supply electronic circuit includes a second dual-channel operational amplifier, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, and a sixteenth capacitor;

The positive power pin +VS of the second dual-channel operational amplifier is electrically connected with the +12V power end through the tenth resistor, the first end of the thirteenth capacitor is connected to the common connection end between the positive power pin +VS of the second dual-channel operational amplifier and the tenth resistor, the second end of the thirteenth capacitor is grounded, and the negative power pin-VS of the second dual-channel operational amplifier is grounded;

the first positive electrode signal input pin +IN/A of the second dual-channel operational amplifier is electrically connected with a +3V power supply end sequentially through the thirteenth resistor and the twelfth resistor, the first end of the fifteenth capacitor and the first end of the sixteenth resistor are both connected to a common connection end between the first positive electrode signal input pin +IN/A of the second dual-channel operational amplifier and the thirteenth resistor, the second end of the fifteenth capacitor is grounded, and the second end of the sixteenth resistor is electrically connected with the second positive electrode signal input pin +IN/B of the second dual-channel operational amplifier; the second positive signal input pin +IN/B of the second dual-channel operational amplifier is also grounded through the seventeenth resistor;

the first negative electrode signal input pin-IN/A of the second dual-channel operational amplifier is electrically connected with the No. 6 pin of the connector, and the first negative electrode signal input pin-IN/A of the second dual-channel operational amplifier is also grounded through the fourteenth resistor; the second negative electrode signal input pin-IN/B of the second dual-channel operational amplifier is electrically connected with the first end of the fifteenth resistor and the first end of the sixteenth capacitor, the second end of the fifteenth resistor and the second end of the sixteenth capacitor are connected together and are connected with the second output pin OUT/B of the second dual-channel operational amplifier, so that the second output pin OUT/B of the second dual-channel operational amplifier outputs +0.11V reference power supply;

The first output pin OUT/A of the second dual-channel operational amplifier is grounded through the eleventh resistor and the twelfth capacitor IN sequence, the No. 7 pin of the connector is connected to the common connection end between the eleventh resistor and the twelfth capacitor, the first end of the fourteenth capacitor is connected to the common connection end between the first output pin OUT/A of the second dual-channel operational amplifier and the eleventh resistor, and the second end of the fourteenth capacitor is connected to the common connection end between the first negative electrode signal input pin-IN/A of the second dual-channel operational amplifier and the fourteenth resistor.

Optionally, the operational amplifier sub-circuit includes a second operational amplifier, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty first resistor, a twenty second resistor, a seventeenth capacitor, an eighteenth capacitor, and a nineteenth capacitor;

the positive input pin of the second operational amplifier is electrically connected with the No. 5 pin of the connector, the first end of the eighteenth resistor and the first end of the seventeenth capacitor are both connected to a common connection end between the positive input pin of the second operational amplifier and the No. 5 pin of the connector, and the second end of the eighteenth resistor and the second end of the seventeenth capacitor are both grounded; the inverting input pin of the second operational amplifier is electrically connected with the pin 4 of the connector, the first end of the twentieth resistor and the first end of the eighteenth capacitor are both connected to a common connection end between the inverting input pin of the second operational amplifier and the pin 4 of the connector, and the second end of the twentieth resistor and the second end of the eighteenth capacitor are both grounded;

The positive power pin of the second operational amplifier is electrically connected with a +12V power end through the twenty-second resistor, the first end of the nineteenth capacitor is connected to a common connection end between the positive power pin of the second operational amplifier and the twenty-second resistor, and the second end of the nineteenth capacitor is grounded; the reference voltage power supply pin of the second operational amplifier is electrically connected with the +0.11V reference power supply output by the second output pin OUT/B of the second dual-channel operational amplifier, the grounding pin of the second operational amplifier is grounded, and the first gain pin of the second operational amplifier is electrically connected with the second gain pin of the second operational amplifier through the twenty-first resistor; and an output pin of the second operational amplifier is electrically connected with an input end of the pressure output sub-circuit through the nineteenth resistor.

Optionally, the pressure output subcircuit includes a twenty-third resistor, a twenty-fourth resistor, a twenty-first capacitor, and a second bidirectional diode;

the first end of the twenty-third resistor is electrically connected with the output end of the operational amplifier sub-circuit, the second end of the twenty-third resistor is electrically connected with the input end of the main control circuit, the first end of the twenty-fourth resistor and the first end of the twenty-first capacitor are both connected to a common connection end between the twenty-third resistor and the input end of the main control circuit, and the second end of the twenty-fourth resistor and the second end of the twenty-first capacitor are both grounded;

The first anode of the second bidirectional diode is electrically connected with the +3.3V power supply end, the second anode of the second bidirectional diode is grounded, and the cathode of the second bidirectional diode is connected to the common connection end between the twenty-third resistor and the input end of the main control circuit.

Optionally, the input pressure detection circuit includes a third pressure sensor, a twentieth capacitor, a pressure output sub-circuit, and a connector having 7 pins;

the No. 1 pin, the No. 2 pin and the No. 3 pin of the connector are electrically connected with the output end of the third pressure sensor; the pin 1 of the connector is also electrically connected with a +5V power supply end, the first end of the twentieth capacitor is connected to a common connection end between the pin 1 of the connector and the +5V power supply end, and the second end of the twentieth capacitor is grounded; the No. 2 pin of the connector is also electrically connected with the input end of the main control circuit through the pressure output sub-circuit, and the No. 3 pin of the connector is also grounded; the No. 4 pin, the No. 5 pin, the No. 6 pin and the No. 7 pin of the connector are all suspended.

The utility model has the beneficial effects that: the output pressure detection circuit arranged at the air outlet of the air channel can detect the pressure condition of the whole air channel output by the pneumoperitoneum machine; the pressure condition of the gas which is delivered to the pneumoperitoneum machine by the gas source can be detected through an input pressure detection circuit arranged at the gas inlet of the gas circuit; the main control circuit can synthesize the detection results of the two pressures to analyze, so that the pressure state of the whole pneumoperitoneum machine is mastered, the pressure detection is more comprehensive, the reliability is high, and the safety of gas delivery can be truly ensured.

Drawings

The features and advantages of the present utility model will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the utility model in any way, in which:

FIG. 1 is a block diagram showing a pressure detecting device of a pneumoperitoneum machine in an embodiment of the present utility model;

FIG. 2A is a schematic diagram of a first power supply circuit according to an embodiment of the utility model;

FIG. 2B is a schematic diagram of a first circuit of a pressure acquisition sub-circuit according to an embodiment of the present utility model;

FIG. 2C is a schematic diagram of a second pressure acquisition sub-circuit in accordance with an embodiment of the present utility model;

FIG. 3A is a schematic diagram of a second power supply circuit in a first input pressure detection scheme according to an embodiment of the present utility model;

FIG. 3B is a schematic diagram of an operational amplifier sub-circuit and a pressure output sub-circuit according to a first embodiment of the present utility model;

FIG. 3C shows a design of a connector in a first input pressure detection scheme in accordance with an embodiment of the present utility model;

FIG. 4 is a schematic diagram showing a connector in a second input pressure detection scheme according to an embodiment of the present utility model

Fig. 5 shows a complete structural diagram of the pneumoperitoneum machine pressure detecting device in the embodiment of the present utility model.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

As shown in fig. 1, a pneumoperitoneum machine pressure detection device comprises a main control circuit, an output pressure detection circuit and an input pressure detection circuit;

the output pressure detection circuit is arranged at the air outlet of the air channel of the pneumoperitoneum machine, and the input pressure detection circuit is arranged at the air inlet of the air channel of the pneumoperitoneum machine;

the output pressure detection circuit and the input pressure detection circuit are electrically connected with the main control circuit.

The pressure detection device of the pneumoperitoneum machine can detect the pressure condition of the whole gas circuit output and the pressure condition of the gas which is conveyed to the pneumoperitoneum machine by the gas source, and the main control circuit can synthesize the detection results of the two pressures to analyze, so that the pressure state of the whole pneumoperitoneum machine is mastered, the pressure detection is more comprehensive, the reliability is high, and the safety of gas conveying can be truly ensured.

Specifically, the functions of each circuit in the utility model are as follows:

based on the electric connection relation between the output pressure detection circuit and the main control circuit, the output pressure detection circuit is used for detecting the output gas pressure at the gas outlet of the gas circuit of the pneumoperitoneum machine and sending the output gas pressure to the main control circuit;

based on the electric connection relation between the input pressure detection circuit and the main control circuit, the input pressure detection circuit is used for detecting the input gas pressure at the gas inlet of the gas circuit of the pneumoperitoneum machine and sending the input gas pressure to the main control circuit;

and the main control circuit is used for obtaining the pressure state of the pneumoperitoneum machine according to the output gas pressure and the input gas pressure.

The pressure state comprises normal pressure and abnormal pressure, normal range values of the output gas pressure and the input gas pressure can be preset respectively, and when the output gas pressure and the input gas pressure are both in the corresponding normal range values, the pressure is normal; and when at least one of the output gas pressure and the input gas pressure is not within the corresponding normal range value, the pressure is abnormal.

The utility model improves the hardware circuit structure of the main control circuit, the output pressure detection circuit and the input pressure detection circuit and the electric connection relation among the circuits to realize the pressure detection device with high reliability, and does not relate to the improvement of computer programs. The main control circuit obtains the pressure state of the pneumoperitoneum machine according to the output gas pressure and the input gas pressure, wherein the related computer programs adopt the existing computer programs, and the corresponding computer programs can be stored in a memory or a storage area of the main control circuit in advance.

The master control circuit of the embodiment comprises a singlechip with a plurality of GPIO ports, ADC ports and communication ports, and the singlechip with the model STM32F407VGT6 is selected.

Preferably, the output pressure detection circuit comprises a first power supply electronic circuit and two identical pressure acquisition sub-circuits;

the input ends of the two pressure acquisition sub-circuits are electrically connected with the output end of the first power supply circuit, and the output ends of the two pressure acquisition sub-circuits are electrically connected with the main control circuit. .

Two paths of identical pressure acquisition subcircuits are arranged, so that the accuracy of pressure detection can be improved; the output end of the first power supply electronic circuit is electrically connected with the input ends of the two pressure acquisition sub-circuits, and the first power supply electronic circuit is independently used for supplying power to the two pressure acquisition sub-circuits, so that the problem of larger pressure detection deviation of the two pressure acquisition sub-circuits can be solved.

Specifically, as shown in fig. 2A, the first power supply circuit includes a first dual-channel operational amplifier U12, a first resistor R19, a second resistor R21, a third resistor R23, a fourth resistor R25, a fifth resistor R26, a first capacitor C58, a second capacitor C61, a third capacitor C62, a fourth capacitor C64, a fifth capacitor C65, a sixth capacitor C66, and a seventh capacitor C67;

The positive power supply pin +VS of the first dual-channel operational amplifier U12 is electrically connected with the +12V power supply end through the first resistor R19, the first end of the second capacitor C61 is connected to the common connection end between the positive power supply pin +VS of the first dual-channel operational amplifier U12 and the first resistor R19, the second end of the second capacitor C61 is grounded, and the negative power supply pin-VS of the first dual-channel operational amplifier U12 is grounded;

the first positive electrode signal input pin +IN/A and the second positive electrode signal input pin +IN/B of the first dual-channel operational amplifier U12 are electrically connected with the +3V power supply end; a first end of the sixth capacitor C66 is connected to a common connection end between the first positive signal input pin +in/a of the first dual-channel operational amplifier U12 and the +3v power supply end, and a second end of the sixth capacitor C66 is grounded; a first end of the seventh capacitor C67 is connected to a common connection end between the second positive signal input pin +in/B of the first dual-channel operational amplifier U12 and the +3v power supply end, and a second end of the seventh capacitor C67 is grounded;

the first negative electrode signal input pin-IN/A of the first dual-channel operational amplifier U12 is electrically connected with the input end of the first path of pressure acquisition subcircuit, and the first negative electrode signal input pin-IN/A of the first dual-channel operational amplifier U12 is also grounded through the fourth resistor R25; the second negative electrode signal input pin-IN/B of the first dual-channel operational amplifier U12 is electrically connected with the input end of the second pressure acquisition sub-circuit, and the second negative electrode signal input pin-IN/B of the first dual-channel operational amplifier U12 is also grounded through the fifth resistor R26;

The first output pin OUT/a of the first dual-channel operational amplifier U12 is grounded sequentially through the second resistor R21 and the first capacitor C58, the input end of the first channel pressure acquisition subcircuit is further connected to a common connection end between the second resistor R21 and the first capacitor C58, the first end of the fourth capacitor C64 is connected to a common connection end between the first output pin OUT/a of the first dual-channel operational amplifier U12 and the second resistor R21, and the second end of the fourth capacitor C64 is connected to a common connection end between the first negative electrode signal input pin-IN/a of the first dual-channel operational amplifier U12 and the fourth resistor R25;

the second output pin OUT/B of the first dual-channel operational amplifier U12 is grounded sequentially through the third resistor R23 and the third capacitor C62, the input end of the second channel pressure acquisition sub-circuit is further connected to a common connection end between the third resistor R23 and the third capacitor C62, the first end of the fifth capacitor C65 is connected to a common connection end between the second output pin OUT/B of the first dual-channel operational amplifier U12 and the third resistor R23, and the second end of the fifth capacitor C65 is connected to a common connection end between the second negative signal input pin-IN/B of the first dual-channel operational amplifier U12 and the fifth resistor R26.

IN the first power supply electronic circuit with the structure, the +VS pin of the U12 is connected with +12V power supply, the +IN/A pin and the-IN/B pin are respectively connected with +3V power supply required by two paths of power supply, the OUT/A pin and the-IN/A pin are respectively connected with the first path of pressure acquisition sub-circuit, the OUT/B pin and the-IN/B pin are respectively connected with the second path of pressure acquisition sub-circuit, and the independent power supply of the two paths of pressure acquisition sub-circuits can be realized by fewer components through the first power supply electronic circuit.

In the first power supply and electronic circuit, the first dual-channel op-amp U12 is an OPA2197IDR type op-amp, and the specifications or types of the resistors and capacitors are shown in fig. 3A, which is not described herein.

Preferably, as shown in fig. 2B and 2C, each of the two pressure acquisition sub-circuits includes a first pressure sensor, a first operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, and a first bidirectional diode;

in each pressure acquisition sub-circuit, a positive electrode pin +LEXC+ of a power supply circuit and a positive electrode pin +LEXC+ of the power supply circuit of the first pressure sensor are electrically connected with the output end of the first power supply circuit; the signal output positive electrode pin SIG+ of the first pressure sensor is electrically connected with the positive input pin of the first operational amplifier, the first end of the eighth capacitor is connected to the common connection end between the signal output positive electrode pin SIG+ of the first pressure sensor and the positive input pin of the first operational amplifier, and the second end of the eighth capacitor is grounded; the signal output negative electrode pin SIG-of the first pressure sensor is electrically connected with the inverting input pin of the first operational amplifier, the first end of the ninth capacitor is connected to the common connection end between the signal output negative electrode pin SIG-of the first pressure sensor and the inverting input pin of the first operational amplifier, and the second end of the ninth capacitor is grounded;

The positive power pin of the first operational amplifier is electrically connected with a +12V power end through the ninth resistor, the first end of the eleventh capacitor is connected to a common connection end between the positive power pin of the first operational amplifier and the ninth resistor, and the second end of the eleventh capacitor is grounded; the reference voltage power supply pin of the first operational amplifier is electrically connected with a +0.11V power supply end, the grounding pin of the first operational amplifier is grounded, and the first gain pin of the first operational amplifier is electrically connected with the second gain pin of the first operational amplifier through the eighth resistor; the output pin of the first operational amplifier is electrically connected with the input end of the main control circuit through the sixth resistor, the first end of the seventh resistor and the first end of the tenth capacitor are both connected to a common connection end between the sixth resistor and the input end of the main control circuit, and the second end of the seventh resistor and the second end of the tenth capacitor are both grounded;

the first anode of the first bidirectional diode is electrically connected with the +3.3V power supply end, the second anode of the first bidirectional diode is grounded, and the cathode of the first bidirectional diode is connected to the common connection end between the sixth resistor and the input end of the main control circuit.

Through the pressure acquisition subcircuit of the structure, the output gas pressure at the gas outlet of the gas circuit can be independently detected according to the two-way acquisition mode, and compared with the single-way acquisition mode, the accuracy of the output gas pressure can be effectively improved.

Specifically, in the first path of pressure acquisition sub-circuit shown in fig. 2B, U10 and U11 are the first pressure sensor and the first operational amplifier, R18, R20, R22 and R24 are the sixth resistor, the seventh resistor, the eighth resistor and the ninth resistor, C57, C59, C60 and C63 are the eighth capacitor, the ninth capacitor, the tenth capacitor and the eleventh capacitor, respectively, and D6 is the first bidirectional diode. The first pressure sensor U10 can select a pressure sensor with a proper model according to actual conditions, the first operational amplifier U11 selects an operational amplifier with INA826AIDR model, and the first bidirectional diode D6 selects a bidirectional diode with BAV99A7 model. IN the first path of pressure acquisition subcircuit, a positive pin LEXC+ of a calibration circuit of U10 is connected to a common connection end between a second resistor R21 and a first capacitor C58 IN FIG. 2A, a negative pin LEXC-of the calibration circuit is connected with an-IN/A pin of U12 IN FIG. 2A, and PRESS1 is finally acquired and input into a singlechip.

Specifically, in the second pressure acquisition sub-circuit shown in fig. 2C, U13 and U14 are the first pressure sensor and the first operational amplifier, R31, R32, R33, and R34 are the sixth resistor, the seventh resistor, the eighth resistor, and the ninth resistor, C68, C70, C69, and C71 are the eighth capacitor, the ninth capacitor, the tenth capacitor, and the eleventh capacitor, respectively, and D7 is the first bidirectional diode. Similarly, the first pressure sensor U13 may be a pressure sensor of a suitable model according to practical situations, the first operational amplifier U14 may be an operational amplifier of the INA826AIDR model, and the first bidirectional diode D7 may be a bidirectional diode of the BAV99A7 model. IN the second pressure acquisition sub-circuit, a positive pin LEXC+ of a calibration circuit of U13 is connected to a common connection end between a third resistor R23 and a third capacitor C62 IN FIG. 2A, a negative pin LEXC-of the calibration circuit is connected with an-IN/B pin of U12 IN FIG. 2A, and PRESS2 is finally acquired and input into the singlechip.

The two pressure acquisition sub-circuits are identical in structure, and the specifications or types of the resistors and the capacitors are shown in fig. 2B and fig. 2C in detail, which are not further described herein.

Preferably, the input pressure detection circuit comprises a second power supply electronic circuit, a second pressure sensor, an operational amplifier sub-circuit, a pressure output sub-circuit and a connector with 7 pins;

The No. 4 pin and the No. 5 pin of the connector J4 are electrically connected with the output end of the second pressure sensor, the No. 6 pin and the No. 7 pin of the connector J4 are also electrically connected with the output end of the second power supply electronic circuit, the No. 4 pin and the No. 5 pin of the connector J4 are also electrically connected with the input end of the operational amplifier sub-circuit, the input end of the operational amplifier sub-circuit is also electrically connected with the output end of the second power supply electronic circuit, and the output end of the operational amplifier sub-circuit is electrically connected with the input end of the main control circuit through the pressure output sub-circuit; and the No. 1 pin, the No. 2 pin and the No. 3 pin of the connector J4 are all suspended.

The input pressure detection circuit with the structure forms a first scheme of input gas pressure detection at the gas inlet, the power supply circuit directly supplies power to the connector and the operational amplifier sub-circuit of the later stage through the second power supply, the input gas pressure is directly collected by the second pressure sensor and the operational amplifier sub-circuit, and the input gas pressure is transmitted to the main control circuit by the pressure output sub-circuit, so that the input gas pressure detection is realized.

Specifically, as shown in fig. 3A and 3C, the second power supply circuit includes a second dual-channel operational amplifier U17, a tenth resistor R42, an eleventh resistor R43, a twelfth resistor R45, a thirteenth resistor R46, a fourteenth resistor R47, a fifteenth resistor R48, a sixteenth resistor R55, a seventeenth resistor R154, a twelfth capacitor C78, a thirteenth capacitor C79, a fourteenth capacitor C80, a fifteenth capacitor C83, and a sixteenth capacitor C86;

The positive power supply pin +vs of the second dual-channel operational amplifier U17 is electrically connected with the +12v power supply end through the tenth resistor R42, the first end of the thirteenth capacitor C79 is connected to the common connection end between the positive power supply pin +vs of the second dual-channel operational amplifier U17 and the tenth resistor R42, the second end of the thirteenth capacitor C79 is grounded, and the negative power supply pin-VS of the second dual-channel operational amplifier U17 is grounded;

the first positive signal input pin +in/a of the second dual-channel operational amplifier U17 is electrically connected to the +3v power supply terminal through the thirteenth resistor R46 and the twelfth resistor R45 IN sequence, the first terminal of the fifteenth capacitor C83 and the first terminal of the sixteenth resistor R55 are both connected to the common connection terminal between the first positive signal input pin +in/a of the second dual-channel operational amplifier U17 and the thirteenth resistor R46, the second terminal of the fifteenth capacitor C83 is grounded, and the second terminal of the sixteenth resistor R55 is electrically connected to the second positive signal input pin +in/B of the second dual-channel operational amplifier U17; the second positive signal input pin +IN/B of the second dual-channel operational amplifier U17 is also grounded through the seventeenth resistor R154;

The first negative electrode signal input pin-IN/a of the second dual-channel operational amplifier U17 is electrically connected with the pin 6 of the connector J4, and the first negative electrode signal input pin-IN/a of the second dual-channel operational amplifier U17 is also grounded through the fourteenth resistor R47; the second negative signal input pin-IN/B of the second dual-channel operational amplifier U17 is electrically connected to the first end of the fifteenth resistor R48 and the first end of the sixteenth capacitor C86, and the second end of the fifteenth resistor R48 and the second end of the sixteenth capacitor C86 are connected together and connected to the second output pin OUT/B of the second dual-channel operational amplifier U17, so that the second output pin OUT/B of the second dual-channel operational amplifier U17 outputs +0.11v reference power;

the first output pin OUT/a of the second dual-channel operational amplifier U17 is grounded through the eleventh resistor R43 and the twelfth capacitor C78 IN sequence, the pin 7 of the connector J4 is connected to a common connection end between the eleventh resistor R43 and the twelfth capacitor C78, the first end of the fourteenth capacitor C80 is connected to a common connection end between the first output pin OUT/a of the second dual-channel operational amplifier U17 and the eleventh resistor R43, and the second end of the fourteenth capacitor C80 is connected to a common connection end between the first negative signal input pin-IN/a of the second dual-channel operational amplifier U17 and the fourteenth resistor R47.

The second pressure sensor is the same as the first pressure sensor, and a pressure sensor chip with a proper model can be selected according to actual conditions.

Specifically, as shown in fig. 3B and 3C, the operational amplifier sub-circuit includes a second operational amplifier U18, an eighteenth resistor R44, a nineteenth resistor R49, a twentieth resistor R51, a twenty first resistor R54, a twenty second resistor R56, a seventeenth capacitor C81, an eighteenth capacitor C84, and a nineteenth capacitor C87;

the positive input pin of the second operational amplifier U18 is electrically connected with the pin No. 5 of the connector J4, the first end of the eighteenth resistor R44 and the first end of the seventeenth capacitor C81 are both connected to a common connection end between the positive input pin of the second operational amplifier U18 and the pin No. 5 of the connector J4, and the second end of the eighteenth resistor R44 and the second end of the seventeenth capacitor C81 are both grounded; the inverting input pin of the second operational amplifier U18 is electrically connected with pin No. 4 of the connector J4, the first end of the twentieth resistor R51 and the first end of the eighteenth capacitor C84 are both connected to a common connection end between the inverting input pin of the second operational amplifier U18 and pin No. 4 of the connector J4, and the second end of the twentieth resistor R51 and the second end of the eighteenth capacitor C84 are both grounded;

The positive power pin of the second operational amplifier U18 is electrically connected with the +12v power end through the twenty-second resistor R56, the first end of the nineteenth capacitor C87 is connected to the common connection end between the positive power pin of the second operational amplifier U18 and the twenty-second resistor R56, and the second end of the nineteenth capacitor C87 is grounded; the reference voltage power supply pin of the second operational amplifier U18 is electrically connected with the +0.11v reference power supply output by the second output pin OUT/B of the second dual-channel operational amplifier U17, the ground pin of the second operational amplifier U18 is grounded, and the first gain pin of the second operational amplifier U18 is electrically connected with the second gain pin of the second operational amplifier U18 through the twenty-first resistor R54; the output pin of the second operational amplifier U18 is electrically connected to the input terminal of the pressure output sub-circuit through the nineteenth resistor R49.

Specifically, as shown in fig. 3B, the pressure output sub-circuit includes a twenty-third resistor R50, a twenty-fourth resistor R52, a twenty-first capacitor C85, and a second bidirectional diode D9;

the first end of the twenty-third resistor R50 is electrically connected with the output end of the operational amplifier sub-circuit, the second end of the twenty-third resistor R50 is electrically connected with the input end of the main control circuit, the first end of the twenty-fourth resistor R52 and the first end of the twenty-first capacitor C85 are both connected to a common connection end between the twenty-third resistor R50 and the input end of the main control circuit, and the second end of the twenty-fourth resistor R52 and the second end of the twenty-first capacitor C85 are both grounded;

The first anode of the second bidirectional diode D9 is electrically connected to the +3.3v power supply terminal, the second anode of the second bidirectional diode D9 is grounded, and the cathode of the second bidirectional diode D9 is connected to the common connection terminal between the twenty-third resistor R50 and the input terminal of the master control circuit.

Specifically, as shown in fig. 3C, pin No. 3 of the connector J4 is grounded, and pin No. 1 and pin No. 2 of the connector J4 are suspended.

The input pressure detection circuit of the above-described structure of fig. 3A to 3C constitutes a first scheme of input gas pressure detection at the gas inlet, and the operational amplifier sub-circuit and the connector J4 (not shown in fig. 3A to 3C) are powered by the second power supply electronic circuit based on the connector J4; meanwhile, based on the connector J4, the second pressure sensor and the operational amplifier sub-circuit are utilized to directly collect the pressure of the input gas at the gas inlet, and the pressure output sub-circuit is utilized to convey the pressure to the main control circuit, so that the pressure detection of the input gas is realized. In the input pressure detection circuit, the operational amplifier sub-circuit outputs presin 1, and the input gas pressure presin is finally acquired by the pressure output sub-circuit and is input into the singlechip.

Wherein, the second output pin OUT/B of the second dual-channel operational amplifier U17 of FIG. 3A outputs +0.11V reference power, which can provide the reference voltage for the second operational amplifier U18 of FIG. 3B; in addition, in the two-way pressure acquisition sub-circuit of the output pressure detection circuit, the reference voltage power supply pins of the first operational amplifiers U11 and U14 are electrically connected with the +0.11v power supply terminal to respectively provide reference voltages for the two first operational amplifiers, so that in practical design, the reference voltage power supply pins of the two first operational amplifiers U11 and U14 can be electrically connected with the second output pin OUT/B of the second dual-channel operational amplifier U17 to realize the supply of the reference voltages in the first operational amplifiers U11 and U14.

Preferably, the input pressure detection circuit comprises a third pressure sensor, a twentieth capacitor C82, a pressure output sub-circuit and a connector with 7 pins;

the No. 1 pin, the No. 2 pin and the No. 3 pin of the connector are electrically connected with the output end of the third pressure sensor; the pin 1 of the connector is also electrically connected with a +5V power supply end, a first end of the twentieth capacitor C82 is connected to a common connection end between the pin 1 of the connector and the +5V power supply end, and a second end of the twentieth capacitor C82 is grounded; the No. 2 pin of the connector is also electrically connected with the input end of the main control circuit through the pressure output sub-circuit, and the No. 3 pin of the connector is also grounded; the No. 4 pin, the No. 5 pin, the No. 6 pin and the No. 7 pin of the connector are all suspended.

Specifically, as shown in fig. 4, pin 1, pin 2 and pin 3 of the connector J4 are all electrically connected with the output end of the third pressure sensor, pin 1 of the connector J4 is electrically connected with the +5v power supply end, pin 2 of the connector J4 is electrically connected with the input end of the pressure output sub-circuit, and pin 3 of the connector is grounded; the No. 4 pin, the No. 5 pin, the No. 6 pin and the No. 7 pin of the connector J4 are all suspended.

The circuit structure shown in fig. 4 is combined with the pressure output sub-circuit, the third pressure sensor and the twentieth capacitor C82, and the input pressure detection circuit formed by the circuit structure forms a second scheme of input gas pressure detection at the gas inlet, and based on the connector J4, on one hand, power is supplied to the third pressure sensor (not shown in fig. 4), on the other hand, input gas pressure at the gas inlet collected by the third pressure sensor is conveyed to the pressure output sub-circuit, and then conveyed to the main control circuit through the pressure output sub-circuit, so that the input gas pressure detection is realized. In the input pressure detection circuit, the input gas pressure is finally acquired and input into the singlechip.

The structure of the pressure output sub-circuit in the second scheme of the input gas pressure detection circuit is the same as that of the pressure output sub-circuit in fig. 3B, and when the second scheme is adopted, the pressure output sub-circuit in fig. 3B is respectively connected with the connector and the main control circuit, specifically, the first end of the twenty-third resistor R50 is connected with pin No. 2 of the connector, the second end of the twenty-third resistor R50 is connected with the main control circuit, and other circuit structures are the same as those of the pressure output sub-circuit in fig. 3B, which are shown in fig. 3B in detail and will not be repeated here.

And the third pressure sensor is the same as the second pressure sensor, and a pressure sensor chip with a proper model can be selected according to actual conditions.

In the two schemes of the input gas pressure detection, the same connector J4 can be used for realizing the detection, namely, when in actual design, one scheme can be independently designed and components in the one scheme can be electrically connected, or the two schemes can be simultaneously designed, and then one scheme can be selected for electrical connection according to specific conditions. In this embodiment, two schemes are designed simultaneously, and when the first scheme is selected, pins 1 and 2 of the connector J4 are suspended, and are disconnected from the third pressure sensor and the pressure output sub-circuit; and then, a pin 3, a pin 4, a pin 5, a pin 6 and a pin 7 of the connector J4 are respectively connected with the second pressure sensor, the pin 3 is also grounded, the pin 4 is also electrically connected with an inverting input pin of a second operational amplifier U18 IN the operational amplifier sub-circuit, the pin 5 is also electrically connected with a normal phase input pin of the second operational amplifier U18 IN the operational amplifier sub-circuit, the pin 6 is also connected between an-IN/A pin of a second dual-channel operational amplifier U17 IN the second power supply sub-circuit and a fourteenth resistor R47, and the pin 7 is also connected between an eleventh resistor R43 and a twelfth capacitor C78 IN the second power supply sub-circuit. When the second scheme is selected, the pin 4, the pin 5, the pin 6 and the pin 7 of the connector J4 are suspended, and are disconnected with the second pressure sensor, the second power supply electronic circuit and the operational amplifier sub-circuit; and then the No. 1 pin, the No. 2 pin and the No. 3 pin of the connector J4 are respectively connected with the second pressure sensor, the No. 3 pin is also grounded, the No. 1 pin is also electrically connected with the +5V power supply end, and the No. 2 pin is also electrically connected with a twenty-third resistor R50 in the pressure output sub-circuit.

Through designing two kinds of schemes simultaneously, can select another kind of detection scheme to realize the detection of input gas pressure when one of them detection scheme breaks down, further promote whole pressure detection device's reliability.

In the selection of the first scheme and the second scheme, the implementation is realized by using the nineteenth resistor R49 in the operational amplifier sub-circuit shown in fig. 3B, that is, when the first scheme is selected to realize the input gas pressure detection, besides the pin connection of the connector needs to be adjusted, the nineteenth resistor R49 needs to be implemented (that is, according to fig. 3B, the nineteenth resistor R49 is connected with the second operational amplifier U18 and the twenty third resistor R50 respectively) so as to ensure that the first scheme is adopted for the input gas pressure detection; when the second scheme is selected to realize the input gas pressure detection, besides the pin connection of the connector needs to be adjusted, the nineteenth resistor R49 needs to be not subjected to the piece-breaking (i.e., the nineteenth resistor R49 is not connected with the second operational amplifier U18 and the twenty third resistor R50), so as to ensure that the input gas pressure detection is performed by adopting the second scheme.

Specifically, in this embodiment, the second dual-channel op-amp U17 is an OPA2197IDR type op-amp chip, the second op-amp U18 is an INA826AIDR type op-amp chip, the second bidirectional diode D9 is a BAV99A7 type bidirectional diode chip, the connector J4 is an XH-7A type connector, and the types or specifications of the resistors and capacitors are shown in fig. 3A to 4 in detail, which are not listed here.

The complete structure of the pneumoperitoneum machine pressure detection device is shown in fig. 5, and the device can be used for detecting the pressure state in the gas circuit of the pneumoperitoneum machine more accurately, so that the reliability of pressure detection is higher, and the safety of gas conveying is truly ensured.

Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations are within the scope of the utility model as defined by the appended claims.

Claims (9)

1. The pneumoperitoneum machine pressure detection device is characterized by comprising a main control circuit, an output pressure detection circuit and an input pressure detection circuit;

the output pressure detection circuit is arranged at the air outlet of the air channel of the pneumoperitoneum machine, and the input pressure detection circuit is arranged at the air inlet of the air channel of the pneumoperitoneum machine;

the output pressure detection circuit and the input pressure detection circuit are electrically connected with the main control circuit.

2. The pneumoperitoneum machine pressure detection device of claim 1, wherein the output pressure detection circuit comprises a first power supply electronic circuit and two identical pressure acquisition sub-circuits;

The input ends of the two pressure acquisition sub-circuits are electrically connected with the output end of the first power supply circuit, and the output ends of the two pressure acquisition sub-circuits are electrically connected with the main control circuit.

3. The pneumoperitoneum machine pressure detection device of claim 2, wherein the first power supply electronic circuit comprises a first dual channel op amp, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a seventh capacitor;

the positive power supply pin +VS of the first dual-channel operational amplifier is electrically connected with the +12V power supply end through the first resistor, the first end of the second capacitor is connected to the common connection end between the positive power supply pin +VS of the first dual-channel operational amplifier and the first resistor, the second end of the second capacitor is grounded, and the negative power supply pin-VS of the first dual-channel operational amplifier is grounded;

the first positive electrode signal input pin +IN/A and the second positive electrode signal input pin +IN/B of the first dual-channel operational amplifier are electrically connected with the +3V power supply end; the first end of the sixth capacitor is connected to a common connection end between a first positive signal input pin +IN/A of the first dual-channel operational amplifier and the +3V power supply end, and the second end of the sixth capacitor is grounded; the first end of the seventh capacitor is connected to a common connection end between the second positive signal input pin +IN/B of the first dual-channel operational amplifier and the +3V power supply end, and the second end of the seventh capacitor is grounded;

The first negative electrode signal input pin-IN/A of the first dual-channel operational amplifier is electrically connected with the input end of the first path of pressure acquisition subcircuit, and the first negative electrode signal input pin-IN/A of the first dual-channel operational amplifier is grounded through the fourth resistor; the second negative electrode signal input pin-IN/B of the first dual-channel operational amplifier is electrically connected with the input end of the second pressure acquisition sub-circuit, and the second negative electrode signal input pin-IN/B of the first dual-channel operational amplifier is grounded through the fifth resistor;

the first output pin OUT/A of the first dual-channel operational amplifier is grounded through the second resistor and the first capacitor IN sequence, the input end of the first path of pressure acquisition subcircuit is also connected to a common connection end between the second resistor and the first capacitor, the first end of the fourth capacitor is connected to the common connection end between the first output pin OUT/A of the first dual-channel operational amplifier and the second resistor, and the second end of the fourth capacitor is connected to the common connection end between the first negative electrode signal input pin-IN/A of the first dual-channel operational amplifier and the fourth resistor;

the second output pin OUT/B of the first dual-channel operational amplifier sequentially passes through the third resistor and the third capacitor to be grounded, the input end of the second pressure acquisition sub-circuit is further connected to a common connection end between the third resistor and the third capacitor, the first end of the fifth capacitor is connected to the common connection end between the second output pin OUT/B of the first dual-channel operational amplifier and the third resistor, and the second end of the fifth capacitor is connected to the common connection end between the second negative electrode signal input pin IN/B of the first dual-channel operational amplifier and the fifth resistor.

4. The pneumoperitoneum machine pressure detection device of claim 2, wherein the two pressure acquisition subcircuits each comprise a first pressure sensor, a first operational amplifier, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, and a first bidirectional diode;

in each pressure acquisition sub-circuit, a positive electrode pin LEXC+ of a power supply circuit and a negative electrode pin LEXC-of the power supply circuit of the first pressure sensor are electrically connected with the output end of the first power supply circuit; the signal output positive electrode pin SIG+ of the first pressure sensor is electrically connected with the positive input pin of the first operational amplifier, the first end of the eighth capacitor is connected to the common connection end between the signal output positive electrode pin SIG+ of the first pressure sensor and the positive input pin of the first operational amplifier, and the second end of the eighth capacitor is grounded; the signal output negative electrode pin SIG-of the first pressure sensor is electrically connected with the inverting input pin of the first operational amplifier, the first end of the ninth capacitor is connected to the common connection end between the signal output negative electrode pin SIG-of the first pressure sensor and the inverting input pin of the first operational amplifier, and the second end of the ninth capacitor is grounded;

The positive power pin of the first operational amplifier is electrically connected with a +12V power end through the ninth resistor, the first end of the eleventh capacitor is connected to a common connection end between the positive power pin of the first operational amplifier and the ninth resistor, and the second end of the eleventh capacitor is grounded; the reference voltage power supply pin of the first operational amplifier is electrically connected with a +0.11V power supply end, the grounding pin of the first operational amplifier is grounded, and the first gain pin of the first operational amplifier is electrically connected with the second gain pin of the first operational amplifier through the eighth resistor; the output pin of the first operational amplifier is electrically connected with the input end of the main control circuit through the sixth resistor, the first end of the seventh resistor and the first end of the tenth capacitor are both connected to a common connection end between the sixth resistor and the input end of the main control circuit, and the second end of the seventh resistor and the second end of the tenth capacitor are both grounded;

the first anode of the first bidirectional diode is electrically connected with the +3.3V power supply end, the second anode of the first bidirectional diode is grounded, and the cathode of the first bidirectional diode is connected to the common connection end between the sixth resistor and the input end of the main control circuit.

5. The pneumoperitoneum machine pressure detecting device according to claim 1, wherein the input pressure detecting circuit comprises a second power supply electronic circuit, a second pressure sensor, an operational amplifier sub-circuit, a pressure output sub-circuit and a connector with 7 pins;

the No. 4 pin and the No. 5 pin of the connector are electrically connected with the output end of the second pressure sensor, the No. 6 pin and the No. 7 pin of the connector are also electrically connected with the output end of the second power supply electronic circuit, the No. 4 pin and the No. 5 pin of the connector are also electrically connected with the input end of the operational amplifier sub-circuit, the input end of the operational amplifier sub-circuit is also electrically connected with the output end of the second power supply electronic circuit, and the output end of the operational amplifier sub-circuit is electrically connected with the input end of the main control circuit through the pressure output sub-circuit; the No. 1 pin, the No. 2 pin and the No. 3 pin of the connector are all suspended.

6. The pneumoperitoneum machine pressure detection device of claim 5, wherein the second power supply electronic circuit comprises a second dual channel op amp, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a fifteenth capacitor, and a sixteenth capacitor;

The positive power pin +VS of the second dual-channel operational amplifier is electrically connected with the +12V power end through the tenth resistor, the first end of the thirteenth capacitor is connected to the common connection end between the positive power pin +VS of the second dual-channel operational amplifier and the tenth resistor, the second end of the thirteenth capacitor is grounded, and the negative power pin-VS of the second dual-channel operational amplifier is grounded;

the first positive electrode signal input pin +IN/A of the second dual-channel operational amplifier is electrically connected with a +3V power supply end sequentially through the thirteenth resistor and the twelfth resistor, the first end of the fifteenth capacitor and the first end of the sixteenth resistor are both connected to a common connection end between the first positive electrode signal input pin +IN/A of the second dual-channel operational amplifier and the thirteenth resistor, the second end of the fifteenth capacitor is grounded, and the second end of the sixteenth resistor is electrically connected with the second positive electrode signal input pin +IN/B of the second dual-channel operational amplifier; the second positive signal input pin +IN/B of the second dual-channel operational amplifier is also grounded through the seventeenth resistor;

the first negative electrode signal input pin-IN/A of the second dual-channel operational amplifier is electrically connected with the No. 6 pin of the connector, and the first negative electrode signal input pin-IN/A of the second dual-channel operational amplifier is also grounded through the fourteenth resistor; the second negative electrode signal input pin-IN/B of the second dual-channel operational amplifier is electrically connected with the first end of the fifteenth resistor and the first end of the sixteenth capacitor, the second end of the fifteenth resistor and the second end of the sixteenth capacitor are connected together and are connected with the second output pin OUT/B of the second dual-channel operational amplifier, so that the second output pin OUT/B of the second dual-channel operational amplifier outputs +0.11V reference power supply;

The first output pin OUT/A of the second dual-channel operational amplifier is grounded through the eleventh resistor and the twelfth capacitor IN sequence, the No. 7 pin of the connector is connected to the common connection end between the eleventh resistor and the twelfth capacitor, the first end of the fourteenth capacitor is connected to the common connection end between the first output pin OUT/A of the second dual-channel operational amplifier and the eleventh resistor, and the second end of the fourteenth capacitor is connected to the common connection end between the first negative electrode signal input pin-IN/A of the second dual-channel operational amplifier and the fourteenth resistor.

7. The pneumoperitoneum machine pressure detection device of claim 6, wherein the operational amplifier sub-circuit comprises a second operational amplifier, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty first resistor, a twenty second resistor, a seventeenth capacitor, an eighteenth capacitor, and a nineteenth capacitor;

the positive input pin of the second operational amplifier is electrically connected with the No. 5 pin of the connector, the first end of the eighteenth resistor and the first end of the seventeenth capacitor are both connected to a common connection end between the positive input pin of the second operational amplifier and the No. 5 pin of the connector, and the second end of the eighteenth resistor and the second end of the seventeenth capacitor are both grounded; the inverting input pin of the second operational amplifier is electrically connected with the pin 4 of the connector, the first end of the twentieth resistor and the first end of the eighteenth capacitor are both connected to a common connection end between the inverting input pin of the second operational amplifier and the pin 4 of the connector, and the second end of the twentieth resistor and the second end of the eighteenth capacitor are both grounded;

The positive power pin of the second operational amplifier is electrically connected with a +12V power end through the twenty-second resistor, the first end of the nineteenth capacitor is connected to a common connection end between the positive power pin of the second operational amplifier and the twenty-second resistor, and the second end of the nineteenth capacitor is grounded; the reference voltage power supply pin of the second operational amplifier is electrically connected with the +0.11V reference power supply output by the second output pin OUT/B of the second dual-channel operational amplifier, the grounding pin of the second operational amplifier is grounded, and the first gain pin of the second operational amplifier is electrically connected with the second gain pin of the second operational amplifier through the twenty-first resistor; and an output pin of the second operational amplifier is electrically connected with an input end of the pressure output sub-circuit through the nineteenth resistor.

8. The pneumoperitoneum machine pressure detection device of claim 5, wherein the pressure output subcircuit comprises a twenty-third resistor, a twenty-fourth resistor, a twenty-first capacitor, and a second bidirectional diode;

the first end of the twenty-third resistor is electrically connected with the output end of the operational amplifier sub-circuit, the second end of the twenty-third resistor is electrically connected with the input end of the main control circuit, the first end of the twenty-fourth resistor and the first end of the twenty-first capacitor are both connected to a common connection end between the twenty-third resistor and the input end of the main control circuit, and the second end of the twenty-fourth resistor and the second end of the twenty-first capacitor are both grounded;

The first anode of the second bidirectional diode is electrically connected with the +3.3V power supply end, the second anode of the second bidirectional diode is grounded, and the cathode of the second bidirectional diode is connected to the common connection end between the twenty-third resistor and the input end of the main control circuit.

9. The pneumoperitoneum machine pressure detection device of claim 1, wherein the input pressure detection circuit comprises a third pressure sensor, a twentieth capacitor, a pressure output sub-circuit and a connector having 7 pins;

the No. 1 pin, the No. 2 pin and the No. 3 pin of the connector are electrically connected with the output end of the third pressure sensor; the pin 1 of the connector is also electrically connected with a +5V power supply end, the first end of the twentieth capacitor is connected to a common connection end between the pin 1 of the connector and the +5V power supply end, and the second end of the twentieth capacitor is grounded; the No. 2 pin of the connector is also electrically connected with the input end of the main control circuit through the pressure output sub-circuit, and the No. 3 pin of the connector is also grounded; the No. 4 pin, the No. 5 pin, the No. 6 pin and the No. 7 pin of the connector are all suspended.