Breathing circuit and anesthesia machine

Abstract

The utility model provides a breathing circuit and an anaesthesia machine, the breathing circuit comprises an inspiration flow sensor, an expiration flow sensor, a heating module and a wireless power supply module, the heating module is arranged on the inspiration flow sensor and / or the expiration flow sensor; the wireless power supply module is wirelessly connected with the heating module; the wireless power supply module is configured to transmit a wireless power supply signal to the heating module; and the heating module is configured to start a heating function when a wireless power supply signal is received so as to heat gas flowing through the inspiration flow sensor and / or the expiration flow sensor. Therefore, the influence of gas condensation on the test precision can be prevented, the heating module can be prevented from being damaged due to disassembly, the service life of the heating module is prolonged, and meanwhile, the cost of the breathing loop is reduced.

Description

Technical Field

[0001] This application belongs to the field of wireless technology, and particularly relates to a breathing circuit and an anesthesia machine. Background Art

[0002] Currently, in the prior art, a gold finger is provided in a heater to connect the heater to a power supply in a wired manner. Although this method can heat the fresh gas in the breathing circuit, it will damage the gold finger during the disassembly and assembly of the circuit, and the setting of the gold finger will increase the cost. Summary of the Utility Model

[0003] This application provides a breathing circuit and an anesthesia machine to improve the service life of the heater and reduce the cost of the breathing circuit.

[0004] In a first aspect, this application provides a breathing circuit, including an inhalation flow sensor, an exhalation flow sensor, a heating module, and a wireless power supply module. The heating module is disposed on the inhalation flow sensor and / or the exhalation flow sensor; the wireless power supply module is wirelessly connected to the heating module;

[0005] The wireless power supply module is configured to transmit a wireless power supply signal to the heating module;

[0006] The heating module is configured to start a heating function when receiving the wireless power supply signal, and heat the gas flowing through the inhalation flow sensor and / or the exhalation flow sensor.

[0007] In a second aspect, this application provides an anesthesia machine including the breathing circuit as described in the first aspect.

[0008] It can be seen that in this application, a breathing circuit and an anesthesia machine are provided. The breathing circuit includes an inhalation flow sensor, an exhalation flow sensor, a heating module, and a wireless power supply module. The heating module is disposed on the inhalation flow sensor and / or the exhalation flow sensor; the wireless power supply module is wirelessly connected to the heating module; the wireless power supply module is configured to transmit a wireless power supply signal to the heating module; the heating module is configured to start a heating function when receiving the wireless power supply signal, and heat the gas flowing through the inhalation flow sensor and / or the exhalation flow sensor. In this way, it can prevent gas condensation from affecting the test accuracy, and can also avoid damage to the heating module due to disassembly, improve the service life of the heating module, and reduce the cost of the breathing circuit at the same time. Description of the Drawings

[0009] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0010] Figure 1 It is the first structural schematic diagram of the breathing circuit provided by the embodiment of the present application;

[0011] Figure 2 It is the second structural schematic diagram of the breathing circuit provided by the embodiment of the present application;

[0012] Figure 3 It is the third structural schematic diagram of the breathing circuit provided by the embodiment of the present application;

[0013] Figure 4 It is the structural schematic diagram of a heating module in Embodiment 1 provided by the embodiment of the present application;

[0014] Figure 5 It is another structural schematic diagram of the heating module in Embodiment 1 provided by the embodiment of the present application;

[0015] Figure 6 It is the circuit diagram of the heating module in Embodiment 1 provided by the embodiment of the present application;

[0016] Figure 7 It is the structural schematic diagram of Embodiment 2 provided by the embodiment of the present application;

[0017] Figure 8 It is the structural schematic diagram of the breathing circuit after adding a power limit unit provided by the embodiment of the present application. Detailed implementation manners

[0018] To enable those skilled in the art to better understand the solutions of the present application, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0019] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, systems, products or devices.

[0020] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0021] The following is an introduction to the relevant terms involved in this application.

[0022] Anesthesia machine: In terms of working principle, the anesthesia machine consists of four main systems: gas supply and control circuit system, breathing circuit system, removal system, and a set of system functions and breathing circuit monitors. In terms of basic structure, it includes the following parts: 1. Gas supply device; 2. Flow meter; 3. Evaporator; 4. Ventilation system; 5. Anesthesia ventilator; 6. Monitoring and alarm device; 7. Anesthetic residual gas removal system. Types of anesthesia ventilators: 1. According to the power source, it can be divided into: pneumatic, electric, and both; 2. According to the driving mechanism, it can be divided into: dual loop, pneumatic type; 3. According to the cycle mechanism, it can be divided into: constant volume, constant pressure, and timing; 4. Modern anesthesia machine: constant volume and timing switching.

[0023] Breathing circuit: Anesthesia breathing circuit is a circuit formed by connecting the gas outlet of the anesthesia machine with the patient's respiratory tract. Fresh gas and inhaled anesthetics are delivered to the patient's respiratory tract through the anesthesia breathing circuit, and the patient's exhaled gas is expelled from the body.

[0024] At present, during the administration of inhaled anesthesia to patients, inhaled or exhaled gas is delivered to the patient through the circuit of the anesthesia machine. Since the exhaled gas of the patient is at 37°C and has a relatively high humidity, when it reaches the expiratory branch of the anesthesia machine breathing circuit, affected by the temperature drop, the exhaled gas is prone to condensation and adheres to the diaphragm of the expiratory flow sensor, resulting in monitoring deviation of the expiratory flow sensor. In addition, after the patient's exhaled gas passes through the CO2 absorption canister, in addition to the absorption of CO2, water and heat are also generated. The exhaled gas still has water vapor after passing through the CO2 absorption canister, which is called the recycled gas. When it converges with the fresh gas during the patient's inhalation phase and is sent to the inspiratory branch of the anesthesia machine breathing circuit, it is also affected by the temperature drop. The inhaled gas of the patient is prone to condensation and adheres to the diaphragm of the inspiratory flow sensor, resulting in monitoring deviation of the inspiratory flow sensor. Existing anesthetics are all designed with a circuit heater to solve the problem that the water vapor is affected by the temperature drop during the transmission of the circuit gas and condenses into water, affecting the sensor monitoring. There are mainly the following two design schemes for the heater:

[0025] 1) The first type of heater transfers heat through the circuit board. The heat transfer path from the heater through the circuit board to the inspiratory or expiratory flow sensor is relatively long. Coupled with the relatively large area of the circuit board, the output power of the heater is relatively large, generally not less than 25W. The heater is connected to the power supply part by wires to output power. Essentially, the heater is a metal wire inside, and external power supply wires are used to supply power. The heating wire and the external power supply wire are metal connections. Metal has a very fast heat transfer effect. The outer layer of the power supply wire of the heater requires a silicone insulating material with a relatively high heat resistance, increasing the cost of the heater; since the power supply wire of the heater is in a high-temperature working condition for a long time, the service life of the silicone insulating material of the wire will be affected; during the disassembly and assembly of the breathing circuit, due to the relatively high working temperature of the heater, the remaining heat will still scald the operator after the heater is turned off.

[0026] 2) The second type of heater is directly placed on the inspiratory and expiratory flow sensors and uses a gold finger to transmit the power of the heater. To ensure the electrical characteristics of the gold finger and the contact, an interference fit is required for the installation and disassembly of the breathing circuit. During the disassembly and assembly of the circuit, the friction between the gold finger and the contact is relatively large. Affected by the transmission power and the disassembly and assembly friction, it is necessary to increase the area of the gold finger contact point, and it is necessary to control the immersion gold process of the gold finger, increasing the manufacturing cost.

[0027] To solve the above problems, an embodiment of the present application provides a breathing circuit. This breathing circuit can be applied to scenarios of gas heating. The heating module provided on the inhalation flow sensor and / or the exhalation flow sensor can be wirelessly powered through a wireless module, and then the heating module starts the heating function when receiving the wireless power supply signal to heat the gas flowing through the inhalation flow sensor and / or the exhalation flow sensor. In this way, the gold fingers on the heating module are eliminated, which can not only prevent gas condensation from affecting the test accuracy, but also avoid damage to the heating module due to disassembly, improve the service life of the heating module, and reduce the cost of the breathing circuit at the same time. This solution can be applied to various scenarios, including but not limited to the application scenarios mentioned above.

[0028] The following describes the specific solutions involved in the embodiments of the present application.

[0029] Please refer to Figures 1 to 3 , the present application also provides a breathing circuit 10, including an inhalation flow sensor 210, an exhalation flow sensor 220, a heating module 300 (such as Figure 3 the inhalation heating module 211 and / or the exhalation heating module 221 in

[0030] ), and a wireless power supply module 110. The heating module is provided on the inhalation flow sensor 210 and / or the exhalation flow sensor 220; the wireless power supply module 110 is wirelessly connected to the heating module; the wireless power supply module 110 is configured to transmit a wireless power supply signal to the heating module; the heating module is configured to start the heating function when receiving the wireless power supply signal to heat the gas flowing through the inhalation flow sensor 210 and / or the exhalation flow sensor 220.

[0031] In a preferred solution of this embodiment, the wireless power supply module 110 can be disposed on the top shell 100 of the breathing circuit, and the inspiratory flow sensor 210 and the expiratory flow sensor 220 can be disposed on the bottom shell 200 of the breathing circuit. Heating modules can be respectively disposed on the inspiratory flow sensor 210 and the expiratory flow sensor 220 to heat the gas flowing through the inspiratory flow sensor 210 and the expiratory flow sensor 220.

[0032] In addition, the heating module can also be disposed only on the inspiratory flow sensor 210, or only on the expiratory flow sensor 220, so that only the gas flowing through the inspiratory flow sensor 210 can be heated, or only the gas flowing through the expiratory flow sensor 220 can be heated.

[0033] Specifically, in this embodiment, the wireless power supply module 110 is disposed near the inspiratory flow sensor 210 or the expiratory flow sensor 220. The wireless power supply module 110 transmits a wireless power supply signal to the heating module. After receiving the wireless power supply signal, the heating module generates an induced voltage, and the induced voltage serves as the power supply voltage of the heating module to enable the heating module to start the heating function and start heating the gas in the pipeline of the breathing circuit 10.

[0034] It can be seen that in this embodiment, the heating module disposed on the inspiratory flow sensor 210 and / or the expiratory flow sensor 220 is wirelessly powered by the wireless module, and then the heating function is started when the heating module receives the wireless power supply signal to heat the gas flowing through the inspiratory flow sensor 210 and / or the expiratory flow sensor 220. In this way, the gold fingers on the heating module are omitted, which can not only prevent gas condensation from affecting the test accuracy, but also avoid damage to the heating module due to disassembly, improve the service life of the heating module, and reduce the cost of the breathing circuit 10 at the same time.

[0035] In the breathing circuit provided by the present application, the heating module 300 and the wireless power supply module 110 have different implementation manners, and the different implementation manners will be described by way of example below.

[0036] Embodiment 1

[0037] In a possible embodiment, please refer to Figure 4, the heating module 300 includes: a wireless power receiving unit 310, connected to the wireless power supply module, configured to generate a supply voltage according to the wireless power supply signal; a heating unit 330, connected to the wireless power receiving unit 310, configured to generate heat under the supply of the supply voltage; an over-temperature protection unit 320, respectively connected to the wireless power receiving unit 310 and the heating unit 330, configured to reduce the operating current of the heating unit 330 when the temperature of the heating unit 330 is greater than or equal to a first temperature threshold, and increase the operating current of the heating unit 330 when the temperature of the heating unit 330 is less than a second temperature threshold.

[0038] Specifically, the over-temperature protection unit 320 includes a temperature sensor and a comparator; the temperature sensor is disposed on the inhalation flow sensor and / or the exhalation flow sensor, and is configured to generate a corresponding detection voltage as the temperature of the inhalation flow sensor and / or the exhalation flow sensor changes; the comparator is connected to the temperature sensor and is configured to output a control signal to the heating unit 330 according to the detection voltage; the control signal is configured to reduce the operating current of the heating unit 330 when the temperature of the heating unit 330 is greater than or equal to a first temperature threshold, and increase the operating current of the heating unit 330 when the temperature of the heating unit 330 is less than a second temperature threshold.

[0039] In a specific implementation, each heating module 300 includes a wireless power receiving unit 310, a heating unit 330, and an over-temperature protection unit 320. The wireless receiving unit can be a dedicated wireless chip or a wireless circuit module composed of discrete devices, and no unique limitation is made here. Among them, the temperature sensor can be one or more, and the comparator can also be one or more; the temperature sensor and the comparator can be in one-to-one correspondence, or one can correspond to multiple or multiple can correspond to one, and no unique limitation is made here.

[0040] Specifically, please refer to Figure 5 , the heating unit 330 may include a heating coil 331 wound around the flow sensor 400. When it is necessary to heat the gas in the breathing circuit, a wireless power supply signal is transmitted by the wireless power supply module 110 provided on the top shell 100 of the breathing circuit, and the wireless power receiving unit 310 provided on the bottom shell 200 of the breathing circuit receives the wireless power supply signal to generate a supply voltage to supply power to the heating unit 330, so that the heating unit 330 starts to generate heat, heats the gas flowing through the flow sensor 400, and raises the gas in the breathing circuit to the target temperature. Among them, if the flow sensor 400 is disposed on the exhalation pipe, it is an exhalation flow sensor; if the flow sensor 400 is disposed on the inhalation pipe, it is an inhalation flow sensor.

[0041] In this embodiment, as Figure 4 shown, before the heating module 300 starts the heating function, the gas temperature in the breathing circuit is approximately equal to the ambient temperature; when it is necessary to heat the gas in the breathing circuit, a wireless power supply signal is transmitted by the wireless power supply module, and the wireless power supply receiving unit 310 receives the wireless power supply signal to generate a supply voltage to supply power to the heating unit 330, so that the heating unit 330 starts to generate heat and raises the gas in the breathing circuit to the target temperature.

[0042] At this time, the temperature sensor continuously detects the temperature of the heating unit 330 and generates a corresponding detection voltage, and then the comparator compares the detection voltage with the reference voltage corresponding to the first temperature threshold to determine whether the temperature of the heating unit 330 is greater than or equal to the first temperature threshold; when it is determined that the temperature of the heating unit 330 is greater than or equal to the first temperature threshold, it means that the temperature of the heating unit is too high, and the comparator outputs a control signal to reduce the working current of the heating unit 330, so that the temperature of the heating unit 330 decreases. When the comparator determines that the temperature of the heating unit 330 is less than the second temperature threshold according to the detection voltage, it means that the temperature of the heating unit is lower than the dew point temperature, which will cause the gas to condense into water droplets. Therefore, it is necessary to increase the gas temperature. Therefore, the comparator outputs a control signal to increase the working current of the heating unit 330, so that the temperature of the heating unit 330 increases, thereby increasing the gas temperature in the breathing circuit. To sum up, during the operation of the heating unit 330, the working current is cyclically changed to keep the gas in the breathing circuit above the second temperature threshold and not exceeding the first temperature threshold.

[0043] A specific circuit example is used to illustrate the solution of this embodiment.

[0044] Specifically, as Figure 6 shown, the overtemperature protection unit 320 includes a first temperature sensor Rt, a first comparator A1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The inverting input terminal of the first comparator A1 is connected to the first end of the first resistor R1 and the first end of the second resistor R2, the non-inverting input terminal of the first comparator A1 is connected to the first end of the third resistor R3 and the first end of the fourth resistor R4, and the output terminal of the first comparator A1 is connected to the second end of the third resistor R3 and the heating unit 330; the second end of the fourth resistor R4 is connected to the first end of the fifth resistor R5 and the first end of the first temperature sensor Rt, and the second ends of the first resistor R1 and the fifth resistor R5 are both connected to the wireless power supply receiving unit 310 to access the supply voltage; the second ends of the second resistor R2 and the first temperature sensor Rt are both grounded.

[0045] Further, the heating unit 330 includes a first switching transistor Q1, a first heating element Rh1, and a second heating element Rh2. The first switching transistor Q1 is connected to the first comparator A1 and is configured to connect or disconnect the second heating element Rh2 according to the control signal to increase or decrease the working current in the heating unit 330. The first heating element Rh1 is connected to the wireless power receiving unit 310, the first switching transistor Q1, and the second heating element Rh2 and is configured to generate a working current under the supply of the supply voltage. The second heating element Rh2 is connected to the first switching transistor Q1 and the second heating element Rh2 and is configured to be connected or disconnected under the control of the control signal to decrease the working current when connected and increase the working current when disconnected.

[0046] In specific implementation, the over-temperature protection unit 320 of this embodiment adopts the circuit structure of a hysteresis comparator. When the heating unit 330 needs to start the heating function, the wireless power receiving unit 310 generates a supply voltage Vcc according to the wireless power supply signal. The first heating element Rh1 is connected to the supply voltage Vcc to start working. The fifth resistor R5 and the first resistor R1 are respectively connected to the supply voltage to supply power to the over-temperature protection unit 320. The first resistor R1 is connected to the supply voltage Vcc and the second resistor R2 to divide the voltage to obtain a first reference voltage Vref. The fifth resistor R5 and the first temperature sensor Rt divide the voltage to obtain a detection voltage Vin.

[0047] Since the first heating element Rh1 just starts to work, the temperature on the first heating element Rh1 will gradually rise from approximately the room temperature. Specifically, at the initial moment, the temperature detected by the first temperature sensor Rt is T_A at the 0 moment. At this time, the resistance of the first temperature sensor Rt is relatively large, and the obtained detection voltage Vin < the first reference voltage Vref. Therefore, the control signal output by the first comparator A1 is at a high level. According to this high-level control signal, the first switching transistor Q1 is controlled to conduct, so that only the first heating element Rh1 is connected to the heating unit 330, and the current in the heating unit 330 reaches the maximum.

[0048] As the heating duration increases, the temperature of the first heating element Rh1 first rises to the dew point temperature at the t0 moment. Since the threshold of the first comparator A1 is still the first reference voltage at this time, the control signal output by the first comparator A1 is still at a high level, and the first heating element Rh1 continues to heat.

[0049] At time t1, the temperature of the first heating element Rh1 rises to the first temperature threshold TH; while the resistance of the first temperature sensor Rt decreases as the temperature of the first heating element Rh1 increases, thereby causing the detection voltage Vin to gradually increase. At time t1, the detection voltage Vin ≥ the first reference voltage Vref. Therefore, the control signal output by the first comparator A1 is at a low level, and the threshold of the first comparator A1 becomes the second reference voltage; the low-level control signal turns off the first switching transistor Q1, thereby connecting the second heating element Rh2 to the circuit. The first heating element Rh1 and the second heating element Rh2 perform heating work simultaneously, resulting in the resistance in the heating unit 330 doubling, and thus the current in the heating unit 330 decreasing to 0.5 times, and the power of the heating unit 330 decreasing to 0.25 times; in this case, the temperature in the heating unit 330 gradually decreases, and the resistance of the first temperature sensor Rt increases as the temperature of the heating unit 330 decreases, thereby causing the detection voltage Vin to gradually decrease.

[0050] At time t2, the temperature in the heating unit 330 decreases to the second temperature threshold TL; at this time, the detection voltage Vin < the second reference voltage VTH+. Therefore, the control signal output by the first comparator A1 becomes high level again, and causes the first switching transistor Q1 to conduct, short-circuiting the second heating element Rh2, and only the first heating element Rh1 performs heating work. Subsequently, the entire circuit cycles between the states at time t1 and time t2, so that the gas in the breathing circuit is maintained above the second temperature threshold and does not exceed the first temperature threshold.

[0051] It can be understood that the first heating element Rh1 and the second heating element Rh2 can be heating wires, heating tubes or other electric heating devices, and the first temperature sensor Rt can be any one of a thermocouple, a thermistor, a resistance temperature detector (RTD) and an IC temperature sensor. According to different temperature sensors, the circuit can be adjusted and adapted accordingly to achieve the functions of the embodiments of the present application. The first switching transistor Q1 can be a MOS transistor, a triode, etc., and no unique limitation is made here.

[0052] It can be seen that in this embodiment, through the cyclic control of the heating unit 330, the temperature of the gas in the breathing circuit is maintained within a certain range, ensuring that the gas temperature is greater than the dew point temperature and within the safe temperature range, which not only ensures that the gas will not condense into water droplets but also ensures the safety of heating.

[0053] Embodiment 2

[0054] In a possible embodiment, please refer to Figure 7, the heating module includes an inhalation heating sub-module 621 and an exhalation heating sub-module 631; the inhalation heating sub-module 621 is configured to start the heating function when receiving the wireless power supply signal, and heat the gas flowing through the inhalation flow sensor 620; the exhalation heating sub-module 631 is configured to start the heating function when receiving the wireless power supply signal, and heat the gas flowing through the exhalation flow sensor 630.

[0055] In a specific implementation, one setting method in this embodiment is that a single heating module includes at least two heating sub-modules, namely an inhalation heating sub-module 621 and an exhalation heating sub-module 631. The inhalation heating sub-module 621 is set at the position of the inhalation flow sensor 620, and the exhalation heating sub-module 631 is set at the position of the exhalation flow sensor 630. It can be understood that the setting methods of the inhalation heating sub-module 621 and the exhalation heating sub-module 631 can be set inside the pipeline of the inhalation flow sensor 620, or outside the pipeline, or at other positions, as long as the heating effect on other parts inside the pipeline can be achieved. The specific setting method is not uniquely limited here.

[0056] Specifically, two sub-modules, an inhalation heating sub-module 621 and an exhalation heating sub-module 631, are set in the heating module, corresponding to the inhalation flow sensor 620 and the exhalation flow sensor 630 respectively; when the inhalation heating sub-module 621 receives the wireless power supply signal emitted by the wireless power supply module, the inhalation heating sub-module 621 heats the gas flowing through the pipeline of the inhalation flow sensor 620; when the exhalation heating sub-module 631 receives the wireless power supply signal emitted by the wireless power supply module, the exhalation heating sub-module 631 heats the gas flowing through the pipeline of the exhalation flow sensor 630, realizing the circulating heating of the gas in the breathing circuit 60, reducing the probability of water vapor condensation, and thus ensuring the detection accuracy of the sensor.

[0057] The inhalation heating sub-module 621 includes an inhalation wireless power supply receiving unit 6211, an inhalation over-temperature protection unit 6212, and an inhalation heating unit 6213. The exhalation heating sub-module 631 includes an exhalation wireless power supply receiving unit 6311, an exhalation over-temperature protection unit 6312, and an exhalation heating unit 6313. Among them, the corresponding functions and structures of the inhalation wireless power supply receiving unit 6211 and the exhalation wireless power supply receiving unit 6311 are the same as those of the wireless power supply receiving unit in Embodiment 1, the corresponding functions and structures of the inhalation over-temperature protection unit 6212 and the exhalation over-temperature protection unit 6312 are the same as those of the over-temperature protection unit in Embodiment 1, and the corresponding functions and structures of the inhalation heating unit 6213 and the exhalation heating unit 6313 are the same as those of the heating unit in Embodiment 1, which will not be elaborated here.

[0058] It can be understood that the frequencies of the wireless power supply signals that the inhalation heating sub-module 621 and the exhalation heating sub-module 631 can receive may be the same or different; when the frequencies are the same, the inhalation heating sub-module 621 and the exhalation heating sub-module 631 can be started simultaneously; when the frequencies are different, the inhalation heating sub-module 621 and the exhalation heating sub-module 631 can be started simultaneously or controlled separately, and no unique limitation is made here.

[0059] It can be seen that in this embodiment, two sub-modules are provided in the heating module to heat the inhalation flow sensor 620 and the exhalation flow sensor 630 respectively, realizing the circulating heating of the gas in the breathing circuit 60, reducing the probability of water vapor condensation, and thus ensuring the detection accuracy of the sensor.

[0060] In a possible embodiment, the wireless power supply module includes: an inhalation wireless power supply transmitting unit 611, wirelessly connected to the inhalation heating sub-module 621 and configured to send a first wireless power supply signal to the inhalation heating sub-module 621; an exhalation wireless power supply transmitting unit 612, wirelessly connected to the exhalation heating sub-module 631 and configured to send a second wireless power supply signal to the exhalation heating sub-module 631.

[0061] In a specific implementation, a setting method of this embodiment is that a single wireless power supply module includes an inhalation wireless power supply transmitting unit 611 and an exhalation wireless power supply transmitting unit 612. Specifically, the inhalation wireless power supply transmitting unit 611 is correspondingly arranged with the inhalation heating sub-module 621. When it is necessary to start the gas heating function of the inhalation pipeline in the breathing circuit 60, the inhalation wireless power supply transmitting unit 611 sends a first wireless power supply signal to the inhalation heating sub-module 621, and this first wireless power supply signal is used to supply power to the inhalation heating sub-module 621 to enable the inhalation heating sub-module 621 to start the heating function; while the exhalation wireless power supply transmitting unit is correspondingly arranged with the exhalation heating sub-module 631. When it is necessary to start the gas heating function of the exhalation pipeline in the breathing circuit 60, the exhalation wireless power supply transmitting unit 612 sends a second wireless power supply signal to the exhalation heating sub-module 631, and this second wireless power supply signal is used to supply power to the exhalation heating sub-module 631 to enable the exhalation heating sub-module 631 to start the heating function.

[0062] It can be understood that the inhalation wireless power supply transmitting unit 611 and the exhalation wireless power supply transmitting unit 612 can be controlled by an additional control unit. When the breathing circuit 60 is in use, the control unit automatically sends a start signal to the inhalation wireless power supply transmitting unit 611 and the exhalation wireless power supply transmitting unit 612 to control the inhalation wireless power supply transmitting unit 611 and the exhalation wireless power supply transmitting unit 612 to respectively transmit a first wireless power supply signal and a second wireless power supply signal. In addition, separate control of the inhalation wireless power supply transmitting unit 611 and the exhalation wireless power supply transmitting unit 612 can also be achieved.

[0063] It can be seen that in this embodiment, through the two wireless power supply sub-units, namely the inhalation wireless power supply transmitting unit 611 and the exhalation wireless power supply transmitting unit 612, respectively corresponding to the inhalation heating sub-module 621 and the exhalation heating sub-module 631 in the heating module for power supply, separate control of different heating sub-modules can be achieved, improving the control flexibility.

[0064] In a possible embodiment, please refer to Figure 8 , the breathing circuit 60 further includes a power limiting unit; the power limiting unit is connected to the wireless power supply module and is configured to limit the output power of the wireless power supply module within a preset threshold.

[0065] In specific implementation, although the over-temperature protection unit is provided in the embodiments of the present application, circuit failures may also occur during the operation of the over-temperature protection unit; when the over-temperature protection unit fails, it will cause the temperature in the heating module to continue to rise, eventually resulting in safety problems.

[0066] To prevent the temperature of the heating module from continuously rising due to the failure of the over-temperature protection circuit, in this embodiment, a power limiting unit is connected to the input end of the wireless power supply module. The power limiting unit limits the transmission power of the wireless power supply module to ensure that the output power of the entire heater is within the expected range, realizing circuit redundancy protection.

[0067] Specifically, the setting method of the power limiting unit is not limited. It can be set inside the wireless power supply module or on the control board 64 of the breathing circuit 60. Setting the power limiting unit inside the wireless power supply module can integrate the power limiting function into the wireless power supply module, facilitating the assembly, disassembly, and migration of the circuit. Setting the power limiting unit on the control board 64 can integrate the power limiting function into the control board 64, which is beneficial to the replacement of the wireless power supply module and the power limiting unit.

[0068] It can be understood that the power limiting unit may include one or more subunits. When there is only a single subunit, the single subunit can perform power limitation on one or more wireless power supply modules or one or more subunits in a single wireless power supply module. When there are multiple subunits, multiple subunits can perform power limitation on multiple wireless power supply modules or multiple subunits in a single wireless power supply module one by one.

[0069] Please refer to Figure 8 , the power limiting unit may include an inhalation power limiting unit 641 and an exhalation power limiting unit 642, which respectively limit the transmission power of the inhalation wireless power supply transmitting unit 611 and the exhalation wireless power supply transmitting unit 612. It can be understood that various implementation manners of the power limiting unit in this embodiment can be applied to each embodiment of the present application, and are not limited herein.

[0070] In addition, the specific implementation manner of the power limiting unit can be any existing circuit structure, as long as it can implement the power limiting function in this embodiment, and no uniqueness limitation is made herein.

[0071] It can be seen that in this embodiment, by limiting the transmission power of the wireless power supply module within a preset range through the power limiting unit, the output power of the entire heater is ensured to be within the expected range, realizing circuit redundancy protection.

[0072] The present application also provides an anesthesia machine, including the breathing circuit described in the embodiment of the present application. The heating module provided on the inhalation flow sensor and / or the exhalation flow sensor can be wirelessly powered through a wireless module, and then the heating function is started when the heating module receives the wireless power supply signal, and the gas flowing through the inhalation flow sensor and / or the exhalation flow sensor is heated. In this way, the gold fingers on the heating module are omitted, which can avoid damage to the heating module due to disassembly, improve the service life of the heating module, and reduce the cost of the breathing circuit at the same time.

[0073] The anesthesia machine can be an anesthesia machine, an anesthetic device or other anesthesia machines or anesthesia devices that need to apply the breathing circuit.

[0074] In several embodiments provided by this application, it should be understood that the disclosed methods, devices, and systems can be implemented in other ways. For example, the device embodiments described above are merely illustrative; for example, the division of the units is only a logical function division, and there can be other division methods in actual implementation; for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling, direct coupling, or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

[0075] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0076] In addition, in each embodiment of the present utility model, the functional units can be integrated in a processing unit, or each unit can be physically included separately, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of a combination of hardware and software functional units.

[0077] Although the present utility model is disclosed as above, the present utility model is not limited thereto. Any person skilled in the art can easily think of changes or replacements without departing from the spirit and scope of the present utility model, and various modifications and changes can be made, including the combination of the above different functions and implementation steps, including the implementation methods of software and hardware, all within the protection scope of the present utility model.

Claims

1. A breathing circuit, characterized in that It includes an inhalation flow sensor, an exhalation flow sensor, a heating module, and a wireless power supply module. The heating module is disposed on the inhalation flow sensor and / or the exhalation flow sensor; the wireless power supply module is wirelessly connected to the heating module; The wireless power supply module is configured to transmit a wireless power supply signal to the heating module; The heating module is configured to start the heating function when receiving the wireless power supply signal and heat the gas flowing through the inhalation flow sensor and / or the exhalation flow sensor.

2. The breathing circuit according to claim 1, wherein The heating module includes an inhalation heating sub-module and an exhalation heating sub-module; The inhalation heating sub-module is configured to start the heating function when receiving the wireless power supply signal and heat the gas flowing through the inhalation flow sensor; The exhalation heating sub-module is configured to start the heating function when receiving the wireless power supply signal and heat the gas flowing through the exhalation flow sensor.

3. The breathing circuit according to claim 2, characterized in that, The wireless power supply module includes: An inhalation wireless power transmission unit, wirelessly connected to the inhalation heating sub-module, and configured to send a first wireless power supply signal to the inhalation heating sub-module; An exhalation wireless power transmission unit, wirelessly connected to the exhalation heating sub-module, and configured to send a second wireless power supply signal to the exhalation heating sub-module.

4. The breathing circuit according to claim 1, characterized in that, The breathing circuit further includes a power limiting unit; The power limiting unit is connected to the wireless power supply module and configured to limit the output power of the wireless power supply module within a preset threshold.

5. The breathing circuit according to claim 1, wherein, The heating module includes: A wireless power receiving unit, connected to the wireless power supply module, and configured to generate a supply voltage according to the wireless power supply signal; A heating unit, connected to the wireless power receiving unit, and configured to generate heat under the supply of the supply voltage; An over-temperature protection unit, respectively connected to the wireless power receiving unit and the heating unit, and configured to reduce the working current of the heating unit when the temperature of the heating unit is greater than or equal to a first temperature threshold, and increase the working current of the heating unit when the temperature of the heating unit is less than a second temperature threshold.

6. The breathing circuit according to claim 5, wherein The over-temperature protection unit includes a temperature sensor and a comparator; The temperature sensor is disposed on the inhalation flow sensor and / or the exhalation flow sensor and is configured to generate a corresponding detection voltage as the temperature of the inhalation flow sensor and / or the exhalation flow sensor changes; The comparator is connected to the temperature sensor and is configured to output a control signal to the heating unit according to the detection voltage; the control signal is configured to reduce the working current of the heating unit when the temperature of the heating unit is greater than or equal to a first temperature threshold, and increase the working current of the heating unit when the temperature of the heating unit is less than a second temperature threshold.

7. The breathing circuit according to claim 6, characterized in that, The heating unit includes a first switching tube, a first heating element, and a second heating element; The first switching tube is connected to the comparator and is configured to connect or disconnect the second heating element according to the control signal to increase or decrease the working current in the heating unit; The first heating element is connected to the wireless power receiving unit, the first switching tube, and the second heating element, and is configured to generate an operating current under the power supply of the supply voltage; The second heating element is connected to the first switching tube and the second heating element, and is configured to be connected or disconnected under the control of a control signal, so as to reduce the operating current when connected and increase the operating current when disconnected.

8. The breathing circuit according to claim 1, wherein, It includes a top shell and a bottom shell. The wireless power supply module is arranged on the top shell, and both the inhalation flow sensor and the exhalation flow sensor are arranged on the bottom shell.

9. The breathing circuit according to claim 4, wherein, The power limiting unit is arranged in the wireless power supply module or on the control board of the breathing circuit.

10. An anesthetic machine, characterized in that, It includes a breathing circuit according to any one of claims 1-9.

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