CN220558044U - Multi-channel flow detection device of pneumoperitoneum machine - Google Patents

Abstract

The utility model discloses a multi-channel flow detection device of a pneumoperitoneum machine, which comprises a main control circuit, a first flow detection circuit, a second flow detection circuit and a third flow detection circuit; the first flow detection circuit, the second flow detection circuit and the third flow detection circuit are all arranged in a gas circuit of the pneumoperitoneum machine; the first flow detection circuit, the second flow detection circuit and the third flow detection circuit are all electrically connected with the main control circuit. The multi-channel flow detection device for the pneumoperitoneum machine realizes that flow detection modules of different channels can be selected under the condition that the existing structure is unchanged, thereby greatly facilitating product maintenance and upgrading and greatly reducing the redevelopment cost and period.

Description

Multi-channel flow detection device of pneumoperitoneum machine

Technical Field

The utility model relates to the field of medical equipment, in particular to a multi-channel flow detection device of a pneumoperitoneum machine.

Background

Laparoscopic surgery requires the creation of an operative space in the abdominal cavity, which requires the infusion of a gas (commonly 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 infused gas after entering the human body, the flow 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 flow rate detection device is typically provided for pneumoperitoneum machines.

However, in the current flow detection device, only one flow detection scheme based on a flow meter is generally set to realize flow detection, and when abnormal conditions such as production stoppage, delay or damage of the flow meter occur, the product needs to be redeveloped, maintained or upgraded, so that the development cost is high, and the development period is prolonged.

Disclosure of Invention

In view of the above, the utility model provides a multi-channel flow detection device of a pneumoperitoneum machine, which solves the problems of high cost and long period of product redevelopment caused by single flow detection scheme in the existing flow detection device of the pneumoperitoneum machine.

The utility model provides a multi-channel flow detection device of a pneumoperitoneum machine, which comprises a main control circuit, a first flow detection circuit, a second flow detection circuit and a third flow detection circuit;

the first flow detection circuit, the second flow detection circuit and the third flow detection circuit are all arranged in a gas circuit of the pneumoperitoneum machine;

The first flow detection circuit, the second flow detection circuit and the third flow detection circuit are all electrically connected with the main control circuit.

Optionally, the first flow detection circuit includes a power supply sub-circuit, a flow acquisition sub-circuit, and a flow output sub-circuit;

the input end of the flow acquisition sub-circuit is electrically connected with the output end of the power supply sub-circuit, and the output end of the flow acquisition sub-circuit is electrically connected with the input end of the main control circuit through the flow output sub-circuit.

Optionally, the power supply electronic circuit includes a dual-channel operational amplifier U27, a first resistor R142, a second resistor R152, a third resistor R153, a first capacitor C143, a second capacitor C144, a third capacitor C145, and a fourth capacitor C146;

the positive power supply pin +vs of the dual-channel operational amplifier U27 is electrically connected with the +12v power supply end through the third resistor R153, the first end of the fourth capacitor C146 is connected to the common connection end between the positive power supply pin +vs of the dual-channel operational amplifier U27 and the third resistor R153, the second end of the fourth capacitor C146 is grounded, and the negative power supply pin-VS of the dual-channel operational amplifier U27 is grounded;

The first positive signal input pin +IN/A, the first negative signal input pin-IN/A and the first output pin OUT/A of the dual-channel operational amplifier U27 are suspended;

the second positive signal input pin +IN/B of the dual-channel operational amplifier U27 is electrically connected with the +3V power supply end, the first end of the first capacitor C143 is connected to the common connection end between the second positive signal input pin +IN/B of the dual-channel operational amplifier U27 and the +3V power supply end, and the second end of the first capacitor C143 is grounded; the second negative electrode signal input pin-IN/B of the dual-channel operational amplifier U27 is electrically connected with the input end of the flow acquisition sub-circuit, and the second negative electrode signal input pin-IN/B of the dual-channel operational amplifier U27 is grounded through the first resistor R142;

the second output pin OUT/B of the dual-channel operational amplifier U27 is grounded through the second resistor R152 and the third capacitor C145 in sequence, and the input end of the flow acquisition sub-circuit is also connected to a common connection end between the second resistor R152 and the third capacitor C145; the first end of the second capacitor C144 is connected to a common connection end between the second output pin OUT/B of the dual-channel op-amp U27 and the second resistor R152 sequentially, and the second end of the second capacitor C144 is connected to a common connection end between the second negative signal input pin-IN/B of the dual-channel op-amp U27 and the first resistor R142.

Optionally, the flow acquisition sub-circuit includes a pressure sensor U16, an operational amplifier U15, a fourth resistor R37, a fifth resistor R40, a sixth resistor R141, a fifth capacitor C72, a sixth capacitor C73, and a seventh capacitor C77;

the positive electrode pin LEXC+ of the power supply circuit and the negative electrode pin LEXC-of the power supply circuit of the pressure sensor U16 are electrically connected with the output end of the power supply electronic circuit; the signal output positive electrode pin sig+ of the pressure sensor U16 is electrically connected to the positive input pin of the operational amplifier U15, a first end of the sixth capacitor C73 is connected to a common connection end between the signal output positive electrode pin sig+ of the pressure sensor U16 and the positive input pin of the operational amplifier U15, and a second end of the sixth capacitor C73 is grounded; the signal output negative electrode pin SIG of the pressure sensor U16 is electrically connected to the inverting input pin of the operational amplifier U15, a first end of the fifth capacitor C72 is connected to a common connection end between the signal output negative electrode pin SIG of the pressure sensor U16 and the inverting input pin of the operational amplifier U15, and a second end of the fifth capacitor C72 is grounded;

the positive power pin of the operational amplifier U15 is electrically connected with the +12v power end through the fourth resistor R37, the first end of the seventh capacitor C77 is connected to the common connection end between the positive power pin of the operational amplifier U15 and the fourth resistor R37, and the second end of the seventh capacitor C77 is grounded; the reference voltage power supply pin of the operational amplifier U15 is electrically connected with a +0.11V power supply end, the grounding pin of the operational amplifier U15 is grounded, and the first gain pin of the operational amplifier U15 is electrically connected with the second gain pin of the operational amplifier U15 through the fifth resistor R40; and an output pin of the operational amplifier U15 is electrically connected with the flow output sub-circuit sequentially through the sixth resistor R141.

Optionally, the flow output subcircuit includes a seventh resistor R38, an eighth resistor R39, a tenth capacitor C74, and a bidirectional diode D8;

the first end of the seventh resistor R38 is electrically connected with the output end of the flow acquisition sub-circuit, the second end of the seventh resistor R38 is electrically connected with the input end of the main control circuit, the first end of the eighth resistor R39 and the first end of the tenth capacitor C74 are both connected to a common connection end between the seventh resistor R38 and the input end of the main control circuit, and the second end of the eighth resistor R39 and the second end of the tenth capacitor C74 are both grounded;

the first anode of the bidirectional diode D8 is electrically connected with the +3.3V power supply end, the second anode of the bidirectional diode D8 is grounded, and the cathode of the bidirectional diode D8 is connected to the common connection end between the seventh resistor R38 and the input end of the main control circuit.

Optionally, the second flow detection circuit includes an analog flowmeter, a flow output sub-circuit, and a connector J3 with 6 pins, and further includes an eighth capacitor C75;

the No. 1 pin, the No. 3 pin and the No. 4 pin of the connector J3 are electrically connected with the analog flowmeter; the pin 1 of the connector J3 is also electrically connected with a +12V power supply end, a first end of the eighth capacitor C75 is connected to a common connection end between the pin 1 of the connector J3 and the +12V power supply end, and a second end of the eighth capacitor C75 is grounded; the pin 4 of the connector J3 is also grounded, and the pin 3 of the connector J3 is also electrically connected with the input end of the main control circuit through the flow output sub-circuit; and the No. 2 pin, the No. 5 pin and the No. 6 pin of the connector J3 are all suspended.

Optionally, the second flow detection circuit includes an analog flow meter, a flow output sub-circuit, and a connector J3 having 6 pins, and further includes a ninth capacitor C76;

the No. 2 pin, the No. 3 pin and the No. 4 pin of the connector are electrically connected with the analog flowmeter; the pin 2 of the connector J3 is also electrically connected with a +5V power supply end, the first end of the ninth capacitor is connected to a common connection end between the pin 2 of the connector and the +5V power supply end, and the second end of the ninth capacitor is grounded; the pin No. 4 of the connector is also grounded, and the pin No. 3 of the connector is also electrically connected with the input end of the main control circuit through the flow output sub-circuit; the No. 1 pin, the No. 5 pin and the No. 6 pin of the connector are all suspended.

Optionally, the third flow detection circuit includes a digital flowmeter, a first MOS transistor Q3, a second MOS transistor Q4, a ninth resistor R27, a tenth resistor R35, an eleventh resistor R36, a twelfth resistor R140, a connector J3 with 6 pins, and an eighth capacitor C75;

the No. 1 pin, the No. 4 pin, the No. 5 pin and the No. 6 pin of the connector J3 are electrically connected with the digital flowmeter; the pin 1 of the connector J3 is also electrically connected with a +12V power supply end, a first end of the eighth capacitor C75 is connected to a common connection end between the pin 1 of the connector J3 and the +12V power supply end, and a second end of the eighth capacitor C75 is grounded; the pin 4 of the connector J3 is also grounded; the pin 5 of the connector J3 is further electrically connected to the drain electrode of the second MOS transistor Q4, the gate electrode of the second MOS transistor Q4 is electrically connected to the +3.3v power supply terminal, the source electrode of the second MOS transistor Q4 is electrically connected to the input terminal of the main control circuit, the first end of the twelfth resistor R140 is connected to the common connection terminal between the gate electrode of the second MOS transistor Q4 and the +3.3v power supply terminal, and the second end of the twelfth resistor R140 is connected to the common connection terminal between the source electrode of the second MOS transistor Q4 and the input terminal of the main control circuit; the No. 6 pin of the connector J3 is also electrically connected with the drain electrode of the first MOS tube Q3, the grid electrode of the first MOS tube Q3 is electrically connected with the +3.3V power supply end, the source electrode of the first MOS tube Q3 is electrically connected with the output end of the main control circuit, the first end of the ninth resistor R27 is connected to the common connection end between the grid electrode of the first MOS tube Q3 and the +3.3V power supply end, and the second end of the ninth resistor R27 is connected to the common connection end between the source electrode of the first MOS tube Q3 and the output end of the main control circuit; the first end of the tenth resistor R35 is electrically connected with the No. 6 pin of the connector J3, the first end of the eleventh resistor R36 is electrically connected with the No. 5 pin of the connector J3, and the second end of the tenth resistor R35 and the second end of the eleventh resistor R36 are electrically connected with a +5V power supply end; and the No. 2 pin and the No. 3 pin of the connector J3 are suspended.

Optionally, the third flow detection circuit includes a digital flowmeter, a first MOS transistor Q3, a second MOS transistor Q4, a ninth resistor R27, a tenth resistor R35, an eleventh resistor R36, a twelfth resistor R140, a connector J3 with 6 pins, and a ninth capacitor C76;

the No. 2 pin, the No. 4 pin, the No. 5 pin and the No. 6 pin of the connector J3 are electrically connected with the digital flowmeter; the pin 2 of the connector J3 is also electrically connected with a +5V power supply end, the first end of the ninth capacitor C76 is connected to a common connection end between the pin 2 of the connector J3 and the +5V power supply end, and the second end of the ninth capacitor C76 is grounded; the pin 4 of the connector J3 is also grounded; the pin 5 of the connector J3 is further electrically connected to the drain electrode of the second MOS transistor Q4, the gate electrode of the second MOS transistor Q4 is electrically connected to the +3.3v power supply terminal, the source electrode of the second MOS transistor Q4 is electrically connected to the input terminal of the main control circuit, the first end of the twelfth resistor R140 is connected to the common connection terminal between the gate electrode of the second MOS transistor Q4 and the +3.3v power supply terminal, and the second end of the twelfth resistor R140 is connected to the common connection terminal between the source electrode of the second MOS transistor Q4 and the input terminal of the main control circuit; the No. 6 pin of the connector J3 is also electrically connected with the drain electrode of the first MOS tube Q3, the grid electrode of the first MOS tube Q3 is electrically connected with the +3.3V power supply end, the source electrode of the first MOS tube Q3 is electrically connected with the output end of the main control circuit, the first end of the ninth resistor R27 is connected to the common connection end between the grid electrode of the first MOS tube Q3 and the +3.3V power supply end, and the second end of the ninth resistor R27 is connected to the common connection end between the source electrode of the first MOS tube Q3 and the output end of the main control circuit; the first end of the tenth resistor R35 is electrically connected with the pin 6 of the connector J3, the first end of the eleventh resistor R36 is electrically connected with the pin 5 of the connector J3, and the second end of the tenth resistor R35 and the second end of the eleventh resistor R36 are both electrically connected with the +5v power supply end; and the No. 1 pin and the No. 3 pin of the connector J3 are suspended.

The utility model has the beneficial effects that: different schemes can be selected to detect the gas flow in the gas path through a first flow detection circuit, a second flow detection circuit and a third flow detection circuit which are arranged in the gas path; by utilizing the electric connection between the detection circuits and the main control circuit, the gas flow detected by each detection scheme can be sent to the main control circuit, so that the main control circuit can analyze and master the flow state of the whole pneumoperitoneum machine conveniently; according to the multi-channel flow detection device for the pneumoperitoneum machine, the functions of flow detection are diversified, and when one of the flow detection circuits fails, the other flow detection circuits are selected to realize flow monitoring, so that under the condition that the existing structure is unchanged, flow detection modules of different channels can be selected, the product maintenance and upgrading are greatly facilitated, and the redevelopment cost and period are greatly reduced.

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 shows a block diagram of a multi-channel flow detection device of a pneumoperitoneum machine in an embodiment of the present utility model;

FIG. 2A is a schematic diagram of a power supply sub-circuit in a first flow detection circuit according to an embodiment of the present utility model;

FIG. 2B is a schematic diagram of a flow acquisition sub-circuit and a flow output sub-circuit in a first flow detection circuit according to an embodiment of the present utility model;

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

FIG. 3B is a schematic diagram of a second power supply mode in a second flow detection circuit according to an embodiment of the present utility model;

fig. 4A shows a design diagram of a third flow rate detection circuit according to an embodiment of the present utility model in a first power supply mode;

fig. 4B shows a design diagram of the third flow rate detection circuit in the second power supply mode according to the embodiment of the present utility model;

fig. 5 shows a complete structural diagram of a multi-channel flow detection device of a pneumoperitoneum machine in an 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 multi-channel flow detection device of a pneumoperitoneum machine comprises a main control circuit, a first flow detection circuit, a second flow detection circuit and a third flow detection circuit;

the first flow detection circuit, the second flow detection circuit and the third flow detection circuit are all arranged in a gas circuit of the pneumoperitoneum machine;

the first flow detection circuit, the second flow detection circuit and the third flow detection circuit are all electrically connected with the main control circuit.

According to the multi-channel flow detection device of the pneumoperitoneum machine, different schemes can be selected to detect the gas flow in the gas circuit through the first flow detection circuit, the second flow detection circuit and the third flow detection circuit which are arranged in the gas circuit; by utilizing the electric connection between the detection circuits and the main control circuit, the gas flow detected by each detection scheme can be sent to the main control circuit, so that the main control circuit can analyze and master the flow state of the whole pneumoperitoneum machine conveniently; according to the multi-channel flow detection device for the pneumoperitoneum machine, the functions of flow detection are diversified, and when one of the flow detection circuits fails, the other flow detection circuits are selected to realize flow monitoring, so that under the condition that the existing structure is unchanged, flow detection modules of different channels can be selected, the product maintenance and upgrading are greatly facilitated, and the redevelopment cost and period are greatly reduced.

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

based on the electric connection relation among the first flow detection circuit, the second flow detection circuit and the third flow detection circuit and the main control circuit, the first flow detection circuit, the second flow detection circuit and the third flow detection circuit are all used for detecting the gas flow in a gas circuit of the pneumoperitoneum machine and sending the gas flow to the main control circuit;

and the main control circuit is used for obtaining the flow state in the gas circuit of the pneumoperitoneum machine according to the received gas flow.

The flow state comprises normal flow and abnormal flow, normal range values of the gas flow and the conveying gas flow can be preset, and when a detection result of the gas flow (the gas flow detected by any flow detection circuit can be selected as a detection result) is in a corresponding normal range value, the flow is normal; and if the detection result of the gas flow is not in the corresponding normal range value, the flow is abnormal.

It should be noted that the present utility model improves the hardware circuit structures of the main control circuit, the first flow detection circuit, the second flow detection circuit, and the third flow detection circuit, and the electrical connection relationship between the circuits, so as to implement the multi-channel flow detection device, and does not involve improvement of a computer program. The main control circuit obtains the flow state of the gas circuit of the pneumoperitoneum machine according to the gas flow, 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 first flow detection circuit comprises a power supply sub-circuit, a flow acquisition sub-circuit and a flow output sub-circuit;

the input end of the flow acquisition sub-circuit is electrically connected with the output end of the power supply sub-circuit, and the output end of the flow acquisition sub-circuit is electrically connected with the input end of the main control circuit through the flow output sub-circuit.

The circuit with the structure forms a first scheme (namely a first flow detection circuit) of flow detection, the power supply sub-circuit directly supplies power to the flow acquisition sub-circuit, the flow acquisition sub-circuit is utilized to directly acquire gas flow, and the gas flow is transmitted to the main control circuit through the flow output sub-circuit, so that flow detection is realized.

Specifically, as shown in fig. 2A, the power supply electronic circuit includes a dual-channel operational amplifier U27, a first resistor R142, a second resistor R152, a third resistor R153, a first capacitor C143, a second capacitor C144, a third capacitor C145, and a fourth capacitor C146;

the positive power supply pin +vs of the dual-channel operational amplifier U27 is electrically connected with the +12v power supply end through the third resistor R153, the first end of the fourth capacitor C146 is connected to the common connection end between the positive power supply pin +vs of the dual-channel operational amplifier U27 and the third resistor R153, the second end of the fourth capacitor C146 is grounded, and the negative power supply pin-VS of the dual-channel operational amplifier U27 is grounded;

The first positive signal input pin +IN/A, the first negative signal input pin-IN/A and the first output pin OUT/A of the dual-channel operational amplifier U27 are suspended;

the second positive signal input pin +IN/B of the dual-channel operational amplifier U27 is electrically connected with the +3V power supply end, the first end of the first capacitor C143 is connected to the common connection end between the second positive signal input pin +IN/B of the dual-channel operational amplifier U27 and the +3V power supply end, and the second end of the first capacitor C143 is grounded; the second negative electrode signal input pin-IN/B of the dual-channel operational amplifier U27 is electrically connected with the input end of the flow acquisition sub-circuit, and the second negative electrode signal input pin-IN/B of the dual-channel operational amplifier U27 is grounded through the first resistor R142;

the second output pin OUT/B of the dual-channel operational amplifier U27 is grounded through the second resistor R152 and the third capacitor C145 in sequence, and the input end of the flow acquisition sub-circuit is also connected to a common connection end between the second resistor R152 and the third capacitor C145; the first end of the second capacitor C144 is connected to a common connection end between the second output pin OUT/B of the dual-channel op-amp U27 and the second resistor R152 sequentially, and the second end of the second capacitor C144 is connected to a common connection end between the second negative signal input pin-IN/B of the dual-channel op-amp U27 and the first resistor R142.

IN the power supply electronic circuit with the structure, the +VS pin of the U27 is connected with a +12V power supply, the-IN/B pin is connected with a +3V power supply required by power supply, the OUT/B pin and the-IN/B pin are connected with the flow acquisition sub-circuit, and the power supply electronic circuit can be used for independently supplying power to the flow acquisition sub-circuit, so that the device is fewer and the structure is simple.

In the above power supply electronic circuit, the dual-channel op-amp U27 is an OPA2197IDR type op-amp, and the specifications or types of the resistors and capacitors are shown in fig. 2A, which is not described herein.

Specifically, as shown in fig. 2B, the flow acquisition sub-circuit includes a pressure sensor U16, an operational amplifier U15, a fourth resistor R37, a fifth resistor R40, a sixth resistor R141, a fifth capacitor C72, a sixth capacitor C73, and a seventh capacitor C77;

the positive electrode pin LEXC+ of the power supply circuit and the negative electrode pin LEXC-of the power supply circuit of the pressure sensor U16 are electrically connected with the output end of the power supply electronic circuit; the signal output positive electrode pin sig+ of the pressure sensor U16 is electrically connected to the positive input pin of the operational amplifier U15, a first end of the sixth capacitor C73 is connected to a common connection end between the signal output positive electrode pin sig+ of the pressure sensor U16 and the positive input pin of the operational amplifier U15, and a second end of the sixth capacitor C73 is grounded; the signal output negative electrode pin SIG of the pressure sensor U16 is electrically connected to the inverting input pin of the operational amplifier U15, a first end of the fifth capacitor C72 is connected to a common connection end between the signal output negative electrode pin SIG of the pressure sensor U16 and the inverting input pin of the operational amplifier U15, and a second end of the fifth capacitor C72 is grounded;

The positive power pin of the operational amplifier U15 is electrically connected with the +12v power end through the fourth resistor R37, the first end of the seventh capacitor C77 is connected to the common connection end between the positive power pin of the operational amplifier U15 and the fourth resistor R37, and the second end of the seventh capacitor C77 is grounded; the reference voltage power supply pin of the operational amplifier U15 is electrically connected with a +0.11V power supply end, the grounding pin of the operational amplifier U15 is grounded, and the first gain pin of the operational amplifier U15 is electrically connected with the second gain pin of the operational amplifier U15 through the fifth resistor R40; and an output pin of the operational amplifier U15 is electrically connected with the flow output sub-circuit sequentially through the sixth resistor R141.

As shown in fig. 2B, the flow output subcircuit includes a seventh resistor R38, an eighth resistor R39, a tenth capacitor C74, and a bidirectional diode D8;

the first end of the seventh resistor R38 is electrically connected with the output end of the flow acquisition sub-circuit, the second end of the seventh resistor R38 is electrically connected with the input end of the main control circuit, the first end of the eighth resistor R39 and the first end of the tenth capacitor C74 are both connected to a common connection end between the seventh resistor R38 and the input end of the main control circuit, and the second end of the eighth resistor R39 and the second end of the tenth capacitor C74 are both grounded;

The first anode of the bidirectional diode D8 is electrically connected with the +3.3V power supply end, the second anode of the bidirectional diode D8 is grounded, and the cathode of the bidirectional diode D8 is connected to the common connection end between the seventh resistor R38 and the input end of the main control circuit.

In the flow acquisition sub-circuit with the structure, the pressure acquired by the pressure sensor U16 is converted to obtain flow, and then the flow is transmitted to the main control circuit by the flow output sub-circuit, so that flow acquisition is realized.

The pressure collected by the pressure sensor U16 may be converted into a flow rate, and a conversion relationship between the pressure and the flow rate may be fitted in advance. The specific method for fitting the conversion relationship between pressure and flow is prior art in the art, and is not described in detail herein.

Specifically, IN the FLOW acquisition sub-circuit IN fig. 2B, the positive electrode pin lexc+ of the calibration circuit of U16 is connected to the common connection end between the second resistor R152 and the third capacitor C145 IN fig. 2A, the negative electrode pin LEXC-of the calibration circuit is connected to the-IN/B pin of U27 IN fig. 2A, and the pressure is finally acquired and converted to FLOW1, and the FLOW output sub-circuit is used to obtain the final FLOW and input the FLOW into the singlechip.

Preferably, the second flow detection circuit comprises an analog flowmeter, a flow output sub-circuit and a connector J3 with 6 pins, and further comprises an eighth capacitor C75;

as shown in fig. 3A, pins 1, 3 and 4 of the connector J3 are electrically connected to the analog flowmeter; the pin 1 of the connector J3 is also electrically connected with a +12V power supply end, a first end of the eighth capacitor C75 is connected to a common connection end between the pin 1 of the connector J3 and the +12V power supply end, and a second end of the eighth capacitor C75 is grounded; the pin 4 of the connector J3 is also grounded, and the pin 3 of the connector J3 is also electrically connected with the input end of the main control circuit through the flow output sub-circuit; and the No. 2 pin, the No. 5 pin and the No. 6 pin of the connector J3 are all suspended.

Preferably, the second flow detection circuit comprises an analog flow meter, a flow output sub-circuit and a connector J3 with 6 pins, and further comprises a ninth capacitor C76;

as shown in fig. 3B, pins No. 2, no. 3 and No. 4 of the connector J3 are electrically connected with the analog flowmeter; the pin 2 of the connector J3 is also electrically connected with a +5V power supply end, the first end of the ninth capacitor C76 is connected to a common connection end between the pin 2 of the connector J3 and the +5V power supply end, and the second end of the ninth capacitor C76 is grounded; the pin 4 of the connector J3 is also grounded, and the pin 3 of the connector J3 is also electrically connected with the input end of the main control circuit through the flow output sub-circuit; and the No. 1 pin, the No. 5 pin and the No. 6 pin of the connector J3 are all suspended.

The second flow rate detection circuit with the above structure forms a second scheme of flow rate detection based on the analog flowmeter, the connector J3 and the flow rate output sub-circuit. Fig. 3A and 3B respectively show two power supply modes (analog flowmeter and main control circuit are not shown in the drawings) in the second scheme, fig. 3A is connected to +12v power supply by using pin 1 of connector J3, and fig. 3B is connected to +5v power supply by using pin 2 of connector J3, both power supply modes can provide power supply required for flow detection; and then, the flow acquired by the analog flowmeter is conveyed to a flow output sub-circuit by utilizing the pin 3 of the connector J3, and then is conveyed to a main control circuit through the flow output sub-circuit, so that flow detection is realized. Whether the No. 1 pin is connected with a +12V power supply or the No. 2 pin is connected with a +5V power supply is determined according to actual power supply requirements.

In the second scheme of the flow detection, the flow output sub-circuit has the same structure as that of the flow output sub-circuit in fig. 2B, and when the second scheme is adopted, the flow output sub-circuit in fig. 2B is respectively connected with the connector and the main control circuit, specifically, the first end of the eighth resistor R38 is connected with pin No. 3 of the connector, the second end of the eighth resistor R38 is connected with the main control circuit, and other circuit structures are the same as those of the flow output sub-circuit in fig. 2B, as shown in fig. 2B, which is not repeated herein.

And the No. 3 pin of the connector J3 outputs FLOW1 to the FLOW output sub-circuit, and the FLOW output sub-circuit is utilized to obtain the final FLOW and input the final FLOW into the singlechip.

Preferably, the third flow detection circuit includes a digital flowmeter, a first MOS transistor Q3, a second MOS transistor Q4, a ninth resistor R27, a tenth resistor R35, an eleventh resistor R36, a twelfth resistor R140, a connector J3 with 6 pins, and an eighth capacitor C75;

as shown in fig. 4A, pins 1, 4, 5 and 6 of the connector J3 are electrically connected to the digital flowmeter; the pin 1 of the connector J3 is also electrically connected with a +12V power supply end, a first end of the eighth capacitor C75 is connected to a common connection end between the pin 1 of the connector J3 and the +12V power supply end, and a second end of the eighth capacitor C75 is grounded; the pin 4 of the connector J3 is also grounded; the pin 5 of the connector J3 is further electrically connected to the drain electrode of the second MOS transistor Q4, the gate electrode of the second MOS transistor Q4 is electrically connected to the +3.3v power supply terminal, the source electrode of the second MOS transistor Q4 is electrically connected to the input terminal of the main control circuit, the first end of the twelfth resistor R140 is connected to the common connection terminal between the gate electrode of the second MOS transistor Q4 and the +3.3v power supply terminal, and the second end of the twelfth resistor R140 is connected to the common connection terminal between the source electrode of the second MOS transistor Q4 and the input terminal of the main control circuit; the No. 6 pin of the connector J3 is also electrically connected with the drain electrode of the first MOS tube Q3, the grid electrode of the first MOS tube Q3 is electrically connected with the +3.3V power supply end, the source electrode of the first MOS tube Q3 is electrically connected with the output end of the main control circuit, the first end of the ninth resistor R27 is connected to the common connection end between the grid electrode of the first MOS tube Q3 and the +3.3V power supply end, and the second end of the ninth resistor R27 is connected to the common connection end between the source electrode of the first MOS tube Q3 and the output end of the main control circuit; the first end of the tenth resistor R35 is electrically connected with the No. 6 pin of the connector J3, the first end of the eleventh resistor R36 is electrically connected with the No. 5 pin of the connector J3, and the second end of the tenth resistor R35 and the second end of the eleventh resistor R36 are electrically connected with a +5V power supply end; and the No. 2 pin and the No. 3 pin of the connector J3 are suspended.

Preferably, the third flow detection circuit includes a digital flowmeter, a first MOS transistor Q3, a second MOS transistor Q4, a ninth resistor R27, a tenth resistor R35, an eleventh resistor R36, a twelfth resistor R140, a connector J3 with 6 pins, and a ninth capacitor C76;

as shown in fig. 4B, pins No. 2, no. 4, no. 5 and No. 6 of the connector J3 are electrically connected with the digital flowmeter; the pin 2 of the connector J3 is also electrically connected with a +5V power supply end, the first end of the ninth capacitor C76 is connected to a common connection end between the pin 2 of the connector J3 and the +5V power supply end, and the second end of the ninth capacitor C76 is grounded; the pin 4 of the connector J3 is also grounded; the pin 5 of the connector J3 is further electrically connected to the drain electrode of the second MOS transistor Q4, the gate electrode of the second MOS transistor Q4 is electrically connected to the +3.3v power supply terminal, the source electrode of the second MOS transistor Q4 is electrically connected to the input terminal of the main control circuit, the first end of the twelfth resistor R140 is connected to the common connection terminal between the gate electrode of the second MOS transistor Q4 and the +3.3v power supply terminal, and the second end of the twelfth resistor R140 is connected to the common connection terminal between the source electrode of the second MOS transistor Q4 and the input terminal of the main control circuit; the No. 6 pin of the connector J3 is also electrically connected with the drain electrode of the first MOS tube Q3, the grid electrode of the first MOS tube Q3 is electrically connected with the +3.3V power supply end, the source electrode of the first MOS tube Q3 is electrically connected with the output end of the main control circuit, the first end of the ninth resistor R27 is connected to the common connection end between the grid electrode of the first MOS tube Q3 and the +3.3V power supply end, and the second end of the ninth resistor R27 is connected to the common connection end between the source electrode of the first MOS tube Q3 and the output end of the main control circuit; the first end of the tenth resistor R35 is electrically connected with the pin 6 of the connector J3, the first end of the eleventh resistor R36 is electrically connected with the pin 5 of the connector J3, and the second end of the tenth resistor R35 and the second end of the eleventh resistor R36 are both electrically connected with the +5v power supply end; and the No. 1 pin and the No. 3 pin of the connector J3 are suspended.

The third flow rate detection circuit having the above configuration constitutes a third aspect of flow rate detection based on the digital flowmeter and the connector J3. Similar to fig. 3A and 3B, fig. 4A and 4B respectively show two power supply modes (the digital flowmeter and the main control circuit are not shown) in the third scheme, fig. 4A is a +12v power supply connected by using pin 1 of the connector J3, and fig. 4B is a +5v power supply connected by using pin 2 of the connector J3, both power supply modes can provide power supply required for flow detection; and then I2C communication interaction is carried out with the main control circuit by utilizing a No. 5 pin and a No. 6 pin of the connector J3, wherein the No. 6 pin is connected with a digital control signal of the main control circuit, and the No. 5 pin directly conveys the flow acquired by the digital flowmeter to the main control circuit, so that flow detection is realized. Similarly, whether the No. 1 pin is connected with a +12V power supply or the No. 2 pin is connected with a +5V power supply is determined according to actual power supply requirements.

In addition, in the third scheme of flow detection, based on the circuit structure formed by the first MOS tube Q3, the second MOS tube Q4, the resistor R27 and the resistor R140, the level conversion from 5V to 3.3V is realized, and the problem that the level of the I2C of the digital flowmeter is inconsistent with the level of a main control circuit (particularly a singlechip) is solved.

In the third FLOW detection circuit, pin 5 of the connector J3 outputs the final FLOW to the singlechip.

In the second and third schemes of the flow detection (i.e., in the second flow detection circuit and the third flow detection circuit), when the second scheme (i.e., the second flow detection circuit) is selected to realize final flow detection, the pin No. 5 and the pin No. 6 of the connector J3 are suspended, and are not connected with the analog flowmeter, and also need to be disconnected from the digital flowmeter and the main control circuit, while the pin No. 1 or the pin No. 2 is selected to be connected with a corresponding power supply according to specific power supply requirements (when the pin No. 1 is selected to be connected with a +12v power supply, the pin No. 2 is suspended, is not connected with a +5v power supply, is not connected with the analog flowmeter, and when the pin No. 2 is selected to be connected with a +5v power supply, the pin No. 1 is suspended, is not connected with a +12v power supply, and is not connected with the analog flowmeter); and then the pin No. 3 and the pin No. 4 are respectively and electrically connected with the analog flowmeter, the pin No. 3 is connected with the main control circuit through a resistor R38 in the flow output sub-circuit, and the pin No. 4 is grounded. When the third scheme (i.e., the third flow detection circuit) is selected to realize final flow detection, pin 3 of the connector J3 is suspended, and is not connected with the digital flowmeter, but is disconnected from the analog flowmeter and the flow output subcircuit, while pin 1 or pin 2 is selected to be connected with a corresponding power supply according to specific power supply requirements (the same situation as the second scheme is selected, and details are not repeated here); and then the No. 4 pin, the No. 5 pin and the No. 6 pin are respectively and electrically connected with the digital flowmeter, the No. 5 pin and the No. 6 pin are respectively connected with the main control circuit, and the No. 4 pin is grounded.

When one of the first scheme and the second scheme/the third scheme is selected to realize the final flow detection, the implementation is realized by using the driving of the sixth resistor R141 in the flow acquisition sub-circuit shown in fig. 2B, that is, when the first scheme (i.e., the first flow detection circuit) is selected to realize the final flow detection, the driving of the sixth resistor R141 is performed (i.e., according to fig. 2B, the sixth resistor R141 is connected to the op-amp U15 and the seventh resistor R38 respectively), so as to realize the connection between the flow acquisition sub-circuit and the flow output sub-circuit, so as to ensure that the first scheme is adopted to perform the flow detection; when the second scheme/third scheme (i.e., the second flow detection circuit/third flow detection circuit) is selected to implement final flow detection, the sixth resistor R141 is not required to be connected (i.e., the sixth resistor R141 is not connected to the op-amp U15 and the seventh resistor R38), and the connection between the flow acquisition sub-circuit and the flow output sub-circuit is disconnected to ensure that the second scheme/third scheme is adopted for flow detection (and the second scheme or the third scheme is adopted, the final flow detection is implemented based on pin adjustment of the connector J3).

In the three schemes of the flow detection, the pressure sensor U16 selects a pressure sensor chip with a proper model according to the specific situation, the operational amplifier U15 selects an operational amplifier chip with an INA8261AIDR model, the bidirectional diode D8 selects a bidirectional diode chip with a BAV99A7 model, and the first MOS tube Q3 and the second MOS tube Q4 both select NMOS tubes with a SI2302 model; the connector J3 is an XH-6A type connector, the analog flowmeter is an F1031V type flowmeter, and the digital flowmeter is an AFM3000-100 type flowmeter; the specification and model of each resistor and capacitor are shown in fig. 2A to 4B, and are not described here.

The complete structure of the multi-channel flow detection device of the pneumoperitoneum machine is shown in fig. 5, and by using the device, when one of the flow detection circuits fails, the other flow detection circuits are selected to realize flow monitoring, so that the reliability of flow detection is high, and the use safety of gas transportation of the pneumoperitoneum machine is truly realized.

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 multi-channel flow detection device of the pneumoperitoneum machine is characterized by comprising a main control circuit, a first flow detection circuit, a second flow detection circuit and a third flow detection circuit;

the first flow detection circuit, the second flow detection circuit and the third flow detection circuit are all arranged in a gas circuit of the pneumoperitoneum machine;

the first flow detection circuit, the second flow detection circuit and the third flow detection circuit are all electrically connected with the main control circuit.

2. The pneumoperitoneum machine multichannel flow detection device of claim 1, wherein the first flow detection circuit comprises a power supply sub-circuit, a flow acquisition sub-circuit and a flow output sub-circuit;

the input end of the flow acquisition sub-circuit is electrically connected with the output end of the power supply sub-circuit, and the output end of the flow acquisition sub-circuit is electrically connected with the input end of the main control circuit through the flow output sub-circuit.

3. The pneumoperitoneum machine multichannel flow detection device of claim 2, wherein the power supply electronic circuit comprises a two-channel op-amp U27, a first resistor R142, a second resistor R152, a third resistor R153, a first capacitor C143, a second capacitor C144, a third capacitor C145, and a fourth capacitor C146;

The positive power supply pin +vs of the dual-channel operational amplifier U27 is electrically connected with the +12v power supply end through the third resistor R153, the first end of the fourth capacitor C146 is connected to the common connection end between the positive power supply pin +vs of the dual-channel operational amplifier U27 and the third resistor R153, the second end of the fourth capacitor C146 is grounded, and the negative power supply pin-VS of the dual-channel operational amplifier U27 is grounded;

the first positive signal input pin +IN/A, the first negative signal input pin-IN/A and the first output pin OUT/A of the dual-channel operational amplifier U27 are suspended;

the second positive signal input pin +IN/B of the dual-channel operational amplifier U27 is electrically connected with the +3V power supply end, the first end of the first capacitor C143 is connected to the common connection end between the second positive signal input pin +IN/B of the dual-channel operational amplifier U27 and the +3V power supply end, and the second end of the first capacitor C143 is grounded; the second negative electrode signal input pin-IN/B of the dual-channel operational amplifier U27 is electrically connected with the input end of the flow acquisition sub-circuit, and the second negative electrode signal input pin-IN/B of the dual-channel operational amplifier U27 is grounded through the first resistor R142;

the second output pin OUT/B of the dual-channel operational amplifier U27 is grounded through the second resistor R152 and the third capacitor C145 in sequence, and the input end of the flow acquisition sub-circuit is also connected to a common connection end between the second resistor R152 and the third capacitor C145; the first end of the second capacitor C144 is connected to a common connection end between the second output pin OUT/B of the dual-channel op-amp U27 and the second resistor R152 sequentially, and the second end of the second capacitor C144 is connected to a common connection end between the second negative signal input pin-IN/B of the dual-channel op-amp U27 and the first resistor R142.

4. The multi-channel flow detection device of pneumoperitoneum machine according to claim 2, wherein the flow acquisition subcircuit comprises a pressure sensor U16, an operational amplifier U15, a fourth resistor R37, a fifth resistor R40, a sixth resistor R141, a fifth capacitor C72, a sixth capacitor C73 and a seventh capacitor C77;

the positive electrode pin LEXC+ of the power supply circuit and the negative electrode pin LEXC-of the power supply circuit of the pressure sensor U16 are electrically connected with the output end of the power supply electronic circuit; the signal output positive electrode pin sig+ of the pressure sensor U16 is electrically connected to the positive input pin of the operational amplifier U15, a first end of the sixth capacitor C73 is connected to a common connection end between the signal output positive electrode pin sig+ of the pressure sensor U16 and the positive input pin of the operational amplifier U15, and a second end of the sixth capacitor C73 is grounded; the signal output negative electrode pin SIG of the pressure sensor U16 is electrically connected to the inverting input pin of the operational amplifier U15, a first end of the fifth capacitor C72 is connected to a common connection end between the signal output negative electrode pin SIG of the pressure sensor U16 and the inverting input pin of the operational amplifier U15, and a second end of the fifth capacitor C72 is grounded;

The positive power pin of the operational amplifier U15 is electrically connected with the +12v power end through the fourth resistor R37, the first end of the seventh capacitor C77 is connected to the common connection end between the positive power pin of the operational amplifier U15 and the fourth resistor R37, and the second end of the seventh capacitor C77 is grounded; the reference voltage power supply pin of the operational amplifier U15 is electrically connected with a +0.11V power supply end, the grounding pin of the operational amplifier U15 is grounded, and the first gain pin of the operational amplifier U15 is electrically connected with the second gain pin of the operational amplifier U15 through the fifth resistor R40; and an output pin of the operational amplifier U15 is electrically connected with the flow output sub-circuit sequentially through the sixth resistor R141.

5. The pneumoperitoneum machine multichannel flow detection device according to claim 2, wherein the flow output subcircuit comprises a seventh resistor R38, an eighth resistor R39, a tenth capacitor C74, and a bidirectional diode D8;

the first end of the seventh resistor R38 is electrically connected with the output end of the flow acquisition sub-circuit, the second end of the seventh resistor R38 is electrically connected with the input end of the main control circuit, the first end of the eighth resistor R39 and the first end of the tenth capacitor C74 are both connected to a common connection end between the seventh resistor R38 and the input end of the main control circuit, and the second end of the eighth resistor R39 and the second end of the tenth capacitor C74 are both grounded;

The first anode of the bidirectional diode D8 is electrically connected with the +3.3V power supply end, the second anode of the bidirectional diode D8 is grounded, and the cathode of the bidirectional diode D8 is connected to the common connection end between the seventh resistor R38 and the input end of the main control circuit.

6. The pneumoperitoneum machine multichannel flow detection device of claim 1, wherein the second flow detection circuit comprises an analog flow meter, a flow output subcircuit and a connector J3 having 6 pins, further comprising an eighth capacitor C75;

the No. 1 pin, the No. 3 pin and the No. 4 pin of the connector J3 are electrically connected with the analog flowmeter; the pin 1 of the connector J3 is also electrically connected with a +12V power supply end, a first end of the eighth capacitor C75 is connected to a common connection end between the pin 1 of the connector J3 and the +12V power supply end, and a second end of the eighth capacitor C75 is grounded; the pin 4 of the connector J3 is also grounded, and the pin 3 of the connector J3 is also electrically connected with the input end of the main control circuit through the flow output sub-circuit; and the No. 2 pin, the No. 5 pin and the No. 6 pin of the connector J3 are all suspended.

7. The pneumoperitoneum machine multichannel flow detection device of claim 1, wherein the second flow detection circuit comprises an analog flow meter, a flow output subcircuit and a connector J3 with 6 pins, further comprising a ninth capacitor C76;

The No. 2 pin, the No. 3 pin and the No. 4 pin of the connector are electrically connected with the analog flowmeter; the pin 2 of the connector J3 is also electrically connected with a +5V power supply end, the first end of the ninth capacitor is connected to a common connection end between the pin 2 of the connector and the +5V power supply end, and the second end of the ninth capacitor is grounded; the pin No. 4 of the connector is also grounded, and the pin No. 3 of the connector is also electrically connected with the input end of the main control circuit through the flow output sub-circuit; the No. 1 pin, the No. 5 pin and the No. 6 pin of the connector are all suspended.

8. The multi-channel flow rate detection device of pneumoperitoneum machine according to claim 1, wherein the third flow rate detection circuit comprises a digital flowmeter, a first MOS transistor Q3, a second MOS transistor Q4, a ninth resistor R27, a tenth resistor R35, an eleventh resistor R36, a twelfth resistor R140, a connector J3 with 6 pins, and an eighth capacitor C75;

the No. 1 pin, the No. 4 pin, the No. 5 pin and the No. 6 pin of the connector J3 are electrically connected with the digital flowmeter; the pin 1 of the connector J3 is also electrically connected with a +12V power supply end, a first end of the eighth capacitor C75 is connected to a common connection end between the pin 1 of the connector J3 and the +12V power supply end, and a second end of the eighth capacitor C75 is grounded; the pin 4 of the connector J3 is also grounded; the pin 5 of the connector J3 is further electrically connected to the drain electrode of the second MOS transistor Q4, the gate electrode of the second MOS transistor Q4 is electrically connected to the +3.3v power supply terminal, the source electrode of the second MOS transistor Q4 is electrically connected to the input terminal of the main control circuit, the first end of the twelfth resistor R140 is connected to the common connection terminal between the gate electrode of the second MOS transistor Q4 and the +3.3v power supply terminal, and the second end of the twelfth resistor R140 is connected to the common connection terminal between the source electrode of the second MOS transistor Q4 and the input terminal of the main control circuit; the No. 6 pin of the connector J3 is also electrically connected with the drain electrode of the first MOS tube Q3, the grid electrode of the first MOS tube Q3 is electrically connected with the +3.3V power supply end, the source electrode of the first MOS tube Q3 is electrically connected with the output end of the main control circuit, the first end of the ninth resistor R27 is connected to the common connection end between the grid electrode of the first MOS tube Q3 and the +3.3V power supply end, and the second end of the ninth resistor R27 is connected to the common connection end between the source electrode of the first MOS tube Q3 and the output end of the main control circuit; the first end of the tenth resistor R35 is electrically connected with the No. 6 pin of the connector J3, the first end of the eleventh resistor R36 is electrically connected with the No. 5 pin of the connector J3, and the second end of the tenth resistor R35 and the second end of the eleventh resistor R36 are electrically connected with a +5V power supply end; and the No. 2 pin and the No. 3 pin of the connector J3 are suspended.

9. The multi-channel flow rate detection device of pneumoperitoneum machine according to claim 1, wherein the third flow rate detection circuit comprises a digital flowmeter, a first MOS transistor Q3, a second MOS transistor Q4, a ninth resistor R27, a tenth resistor R35, an eleventh resistor R36, a twelfth resistor R140, and a connector J3 having 6 pins, and further comprises a ninth capacitor C76;

the No. 2 pin, the No. 4 pin, the No. 5 pin and the No. 6 pin of the connector J3 are electrically connected with the digital flowmeter; the pin 2 of the connector J3 is also electrically connected with a +5V power supply end, the first end of the ninth capacitor C76 is connected to a common connection end between the pin 2 of the connector J3 and the +5V power supply end, and the second end of the ninth capacitor C76 is grounded; the pin 4 of the connector J3 is also grounded; the pin 5 of the connector J3 is further electrically connected to the drain electrode of the second MOS transistor Q4, the gate electrode of the second MOS transistor Q4 is electrically connected to the +3.3v power supply terminal, the source electrode of the second MOS transistor Q4 is electrically connected to the input terminal of the main control circuit, the first end of the twelfth resistor R140 is connected to the common connection terminal between the gate electrode of the second MOS transistor Q4 and the +3.3v power supply terminal, and the second end of the twelfth resistor R140 is connected to the common connection terminal between the source electrode of the second MOS transistor Q4 and the input terminal of the main control circuit; the No. 6 pin of the connector J3 is also electrically connected with the drain electrode of the first MOS tube Q3, the grid electrode of the first MOS tube Q3 is electrically connected with the +3.3V power supply end, the source electrode of the first MOS tube Q3 is electrically connected with the output end of the main control circuit, the first end of the ninth resistor R27 is connected to the common connection end between the grid electrode of the first MOS tube Q3 and the +3.3V power supply end, and the second end of the ninth resistor R27 is connected to the common connection end between the source electrode of the first MOS tube Q3 and the output end of the main control circuit; the first end of the tenth resistor R35 is electrically connected with the pin 6 of the connector J3, the first end of the eleventh resistor R36 is electrically connected with the pin 5 of the connector J3, and the second end of the tenth resistor R35 and the second end of the eleventh resistor R36 are both electrically connected with the +5v power supply end; and the No. 1 pin and the No. 3 pin of the connector J3 are suspended.