WO2021047322A1 - Breathing pipeline interface and ventilator using same - Google Patents

Abstract

A breathing pipeline interface (11), comprising an air inlet joint (112) and an air outlet joint (113). The air inlet joint (112) is fixedly connected to the air outlet joint (113) by means of a connecting piece (114); a breathing pipeline interface PCBA board (111) is embedded in the air outlet joint (113), and the breathing pipeline interface PCBA board (111) is used for measuring a temperature of air in the air outlet joint (113) and can measure the temperature of air entering an adapter body (121); a circuit board is provided on a breathing pipeline connecting piece (1), so that the temperature of air at an outlet of a humidification tank (3) can be measured. The humidifying and heating effect is ensured, and the breathing pipeline connecting piece (1) is made of a consumable, can be directly replaced after use of a patient without disinfection, and can prevent cross infection; a thrusting needle and a socket (1111) of the thrusting needle are directly provided on the PCBA board (111); the relative position of connectors can be ensured; machining is facilitated during encapsulation, the accuracy of induction of a temperature sensor is ensured, and the machining costs and time are reduced.

Description

Breathing pipeline interface and breathing machine using the breathing pipeline interface Technical field

The invention relates to the field of medical equipment, in particular to a breathing tube interface and a ventilator using the breathing tube interface.

Background technique

At present, because the ventilator has a good effect on the maintenance of vital signs, the ventilator is widely used in the medical industry. The gas of the ventilator usually needs to be heated and/or humidified to ensure that the gas temperature and/or humidity are within the comfortable range of the human body, especially For patients who need a ventilator to maintain breathing, they are more sensitive to the temperature and humidity of the gas entering the human body. There are devices on the market that can heat/humidify the gas, but they cannot meet the specific requirements of the patient. For example, the general ventilator cannot be based on Specific airflow temperature is monitored, and some ventilators with heating function need to be heated inside the ventilator. Therefore, the ventilator pipeline needs to be disinfected and maintained regularly to avoid cross-infection between different patients. Once the temperature monitoring device is fixed, It is inconvenient for disinfection treatment, which is more troublesome.

Summary of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, the purpose of the present invention is to solve the problem that the existing ventilator detects the gas temperature and heats up according to the temperature, which is prone to cross-infection.

A breathing pipeline interface includes an air inlet connector and an air outlet connector. The air inlet connector and the air outlet connector are fixedly connected by a connecting piece. A detection device is embedded in the air outlet connector, and the detection device is used to detect various parameters of the gas in the air connector , Including but not limited to: temperature, humidity, pressure and oxygen concentration.

In one of the embodiments, the detection device includes: a breathing circuit interface PCBA board and/or a sensor.

In one of the embodiments, the air outlet connector includes a humidification tank air outlet for connecting the air outlet of the humidification tank, a breathing tube air inlet for connecting a breathing tube, and a mounting groove for an embedded breathing tube interface PCBA board.

In one of the embodiments, the air inlet connector includes a ventilator air outlet for connecting to the air outlet of the ventilator and a humidifying tank air inlet for connecting to the air inlet of the humidifying tank.

In one of the embodiments, the installation groove is vertically arranged with the air outlet connector, and the installation groove is also provided with a connecting hole for electrical connection with the breathing pipeline, and the connecting hole is arranged in the same direction as the air inlet of the breathing pipeline.

In one of the embodiments, the connecting member is a hollow structure, and a reinforcing rib for increasing the strength of the connecting member is provided inside the hollow structure.

In one of the embodiments, a pin socket is provided on the breathing circuit interface PCBA board, and the pin socket is arranged in the same direction as the air inlet of the breathing circuit.

The present invention also discloses a ventilator, including a housing provided on the outside, a humidification tank assembly provided on the housing, a fan assembly provided in the housing, a power supply assembly provided under the fan assembly in the housing, and a humidifier The breathing tube connector on the tank assembly is used to connect the breathing tube; among them, the breathing tube connector is provided with a detection device, the detection device includes: a PCBA board and/or a sensor, through the PCBA board and/or sensor to achieve Information collection and information transmission are carried out in the breathing circuit.

In one of the embodiments, the breathing circuit connector includes: a breathing circuit interface arranged on the humidification tank assembly for connecting the humidification tank assembly and the breathing circuit, and a breathing circuit interface arranged on the breathing circuit interface for connecting the breathing circuit and the breathing circuit. The breathing circuit adapter of the breathing circuit interface; among them, the breathing circuit interface PCBA board is provided on the breathing circuit interface, which is used to detect various parameters of the gas in the air connector, including but not limited to: temperature, humidity, pressure and The oxygen concentration, breathing circuit interface and breathing circuit adapter are all made of consumables. The fan assembly and the breathing circuit interface are connected through a one-way valve, and the joint is equipped with a sealing ring.

In one of the embodiments, a flow sensor is provided between the fan assembly and the humidification tank assembly. The flow sensor is used to measure the amount of gas entering the humidification tank assembly from the fan assembly. An oxygen concentration is provided between the flow sensor and the fan assembly. Sensor, the oxygen concentration sensor is used to measure the oxygen concentration of the gas in the fan assembly; a pressure sensor is arranged between the flow sensor and the humidification tank assembly, and the pressure sensor is used to monitor the pressure in the pipeline; in the humidification tank assembly and the breathing tube There is also a temperature sensor between the roads; the sensor is not limited to the above sensors, in addition, the ambient temperature and humidity sensors can also be set.

In one of the embodiments, the breathing circuit adapter includes: an adapter body and a control device arranged on the adapter body, the control device includes an adapter PCBA board and a connection port arranged on the adapter PCBA board, the connection port is used for It is electrically connected to the breathing circuit interface PCBA board.

The present invention also includes a breathing circuit identification method: the PCBA board is provided with a thermistor (such as thermistor) for measuring temperature, and each type of pipeline is embedded corresponding to thermistors with different resistance values at the same temperature. The PCBA board can identify different pipeline models by identifying the resistance value of the thermal element at the same temperature.

The beneficial effects of the present invention:

The invention can measure the gas temperature at the outlet of the humidification tank by arranging the circuit board on the breathing pipeline connector. The humidification and heating effect is guaranteed, and the breathing circuit connections are all made of consumables, which can be directly replaced after a patient is used up, without disinfection, to prevent cross-infection.

The pins and the pin sockets are directly arranged on the PCBA board, which can ensure the relative position of the connectors, facilitate processing during encapsulation, ensure the accuracy of temperature sensor sensing, and reduce processing costs and time.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on the structure shown in these drawings.

Figure 1 is an overall schematic diagram of the present invention.

Figure 2 is an exploded schematic diagram of the breathing circuit connector and humidification tank assembly of the present invention.

Figure 3 is an exploded schematic view of the casing of the present invention.

Figure 4 is an exploded schematic view of the base of the present invention.

Figure 5 is a schematic diagram of the breathing circuit interface of the present invention.

Figure 6 is a top view of the breathing circuit interface of the present invention.

Figure 7 is a front view of the breathing circuit interface of the present invention.

Figure 8 is a schematic diagram of the breathing circuit adapter of the present invention.

Figure 9 is a cross-sectional view of the breathing tube adapter of the present invention.

Figure 10 is an exploded schematic diagram of the breathing tube adapter of the present invention.

Figure 11 is a schematic diagram of the first connecting end of the present invention.

Figure 12 is a schematic diagram of the buckle of the present invention.

Fig. 13 is a schematic diagram of the working principle of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

It should be noted that all directional indicators (such as up, down, left, right, front, back, inside, outside, center...) in the embodiments of the present invention are only used to explain that they are in a specific posture (as shown in the drawings) If the relative positional relationship and movement conditions of the components below change, if the specific posture changes, the directional indication will also change accordingly.

In the present invention, unless otherwise clearly specified and limited, the terms "connected", "fixed", etc. should be interpreted broadly. For example, "fixed" can be a fixed connection, a detachable connection, or a whole; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be an internal communication between two components or an interaction relationship between two components, unless specifically defined otherwise. For those of ordinary skill in the art, the specific meanings of the above-mentioned terms in the present invention can be understood according to specific circumstances.

In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but they must be based on what can be achieved by a person of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that the combination of such technical solutions It does not exist, nor does it fall within the scope of protection claimed by the present invention.

Example 1

1 to 5, a ventilator includes: a housing 2 arranged on the outside, a humidification tank assembly 3 arranged on the housing 2, a fan assembly 4 arranged in the housing 2, and a housing 2 arranged on the housing 2. The power supply assembly 5 under the fan assembly 4 and the breathing tube connector 1 arranged on the humidification tank assembly 3 for connecting the breathing tube; wherein, the breathing tube connector 1 is provided with a detection device, which includes : Breathing circuit interface PCBA board 111 and/or sensor, through the breathing circuit interface PCBA board 111 and/or sensor, information collection and information transmission in the breathing circuit are realized.

Preferably, the breathing circuit connector 1 includes: a breathing circuit interface 11 arranged on the humidification tank assembly 3 for connecting the humidification tank assembly 3 and the breathing circuit, and a breathing circuit interface 11 arranged on the breathing circuit interface 11 for connecting the breathing circuit The breathing circuit adapter 12 of the breathing circuit interface 11; wherein the breathing circuit interface 11 is provided with a breathing circuit interface PCBA board 111, and the breathing circuit interface PCBA board 111 can have a built-in temperature sensor for detecting the air connector The temperature of the gas in 113; the breathing circuit interface 11 and the breathing circuit adapter 12 are made of consumables.

Further preferably, a golden finger is provided at one end of the breathing circuit interface PCBA board 111, and the golden finger is used to connect to the control module to realize information collection and information transmission in the breathing circuit.

Preferably, the fan assembly 4 and the breathing circuit interface 11 are connected through a one-way valve 6, and the connection is provided with a sealing ring 61, and the air flow is effectively controlled by setting a one-way valve 6 between the fan assembly 4 and the breathing circuit interface 11 Path to prevent the backflow of gas and cause cross-contamination.

8-12 Preferably, the breathing circuit adapter 12 includes: an adapter body 121 and a control device 122 arranged on the adapter body 121, the control device 122 includes an adapter PCBA board 1221 and a PCBA board arranged on the adapter The connection port 1222 on the 1221, the connection port 1222 is used for electrical connection with the breathing circuit interface PCBA board 111.

With reference to Figures 5-7, preferably, the breathing circuit interface 11 includes an air inlet connector 112 and an air outlet connector 113. The air inlet connector 112 and the air outlet connector 113 are fixedly connected by a connector 114, and a breathing tube is embedded in the air outlet connector 113. The interface PCBA board 111 and/or sensor, and the breathing circuit interface PCBA board 111 and/or sensor are used to detect various parameters of the gas in the air connector 113, including but not limited to: temperature, humidity, pressure, and oxygen concentration.

More preferably, all the aforementioned sensors include, but are not limited to: temperature sensors, humidity sensors, pressure sensors, oxygen concentration sensors, and flow sensors.

More preferably, the air outlet connector 113 includes a humidification tank air outlet 1131 for connecting the air outlet of the humidification tank, a breathing tube air inlet 1132 for connecting a breathing tube, and an embedded breathing tube interface PCBA board 111 for installation Slot 1133.

More preferably, the air inlet connector 112 includes a ventilator air outlet 1121 for connecting to the air outlet of the ventilator and a humidifying tank air inlet 1122 for connecting to the air inlet of the humidifying tank.

Further preferably, the installation groove 1133 is vertically arranged with the air outlet connector 113, and the installation groove 1133 is also provided with a connection hole 115 for electrical connection with the connection port of the breathing tube adapter 12, the connection hole 115 and the breathing tube air inlet 1132 Same direction setting.

Further preferably, the connecting member 114 is a hollow structure, and reinforcing ribs for increasing the strength of the connecting member 114 are provided inside the hollow structure.

Further preferably, a pin socket 1111 is provided on the breathing circuit interface PCBA board 111, and the pin socket is arranged in the same direction as the breathing circuit air inlet 1132 for electrical connection with the pins of the connection port 1222. The pin socket The number of 1111 can be set according to usage requirements.

Further preferably, the housing 2 includes an upper cover 21 and a base 22. A control module is provided on the top of the upper cover 21, and the control module is preferably a main PCBA board 213 connected with a button 211 and a display screen 212.

Furthermore, the ventilator housing 2 is also provided with a golden finger connection groove 2131 for connecting to the breathing circuit interface 11. Among them, the mechanical opening corresponds to 114 on the breathing circuit interface, which has the function of guiding and positioning. And can prevent liquid from accidentally entering the electrical connection part. The electrical socket of the golden finger connection slot 2131 is connected to the main control PCBA board 213, and the breathing circuit interface PCBA board 111 and the main control PCBA board 213 are electrically connected together.

More preferably, the main control PCBA board 213 is also connected with a golden finger connection slot 2131 for connecting the breathing circuit interface PCBA board 111.

Further preferably, one end of the base 22 is provided with a humidification tank assembly 3, the humidification tank assembly 3 includes: a water tank 31 arranged on the base 22 and a heating plate 32 arranged at the bottom of the water tank 31, the top of the water tank 31 Connect with the breathing circuit interface 11.

Further preferably, the fan assembly 4 includes: a fan main body 41, an air inlet filter 42 arranged at the inlet of the fan main body 41, and an oxygen interface 43 arranged on the side of the air inlet filter 42.

Further preferably, the power supply assembly 5 includes: a power supply module 51 provided on the base and an AC power interface 52 for connecting the power supply module 51 and an AC power supply.

In specific use of this embodiment, after the ventilator is powered on, the button 211 and the display screen 212 are used to control the ventilator to be in an open state. At this time, the fan body 41 sucks in outside air through the air inlet filter 42 and is arranged on the side of the air inlet filter 42. Connect oxygen to the oxygen interface 43 to adjust the oxygen concentration in the gas;

The air mixed with oxygen inhaled by the fan body is sequentially injected into the water tank 31 through the one-way valve 6, the ventilator outlet 1121, and the humidification tank air inlet 1122. The water in the water tank 31 is heated by the heating plate 32 to form a heated and humidified gas. , And then enter the breathing tube through the humidification tank air outlet 1131, the breathing tube air inlet 1132, and the breathing tube adapter 12 in turn, and deliver to the patient through the breathing tube.

Among them, the breathing circuit interface PCBA board 111 and/or the sensor can detect the temperature in the breathing circuit interface 11, and send the temperature information to the main control PCBA board through the golden finger set on the breathing circuit interface PCBA board 111 , Feedback from the display on the main control PCBA board, and further control through the buttons.

Example 2:

8-12, a breathing circuit adapter 1212 includes an adapter main body 121 and a control device 122 arranged on the adapter main body 121. The control device 122 includes an adapter PCBA board 1221 and an adapter PCBA board. The connection port 1222 on the 1221, the connection port 1222 is used for electrical connection with the breathing circuit interface PCBA board 111.

Furthermore, the connection port 1222 is directly and fixedly connected to the adapter PCBA board 1221.

Further, the heating element is preferably a heating wire 123, which is arranged in a breathing tube connected to the adapter body 121. The breathing tube is a bellows. The bellows refers to the use of a foldable corrugated sheet along the folding and stretching direction. The connected tubular elastic element is connected between the ventilator and the patient's breathing mask for conveying the airflow in the ventilator to the breathing mask, which is convenient for the patient to breathe oxygen and other airflow. The adapter body 1 can connect the breathing tube interface 11 with Connect the breathing circuit.

Furthermore, the heating wire 123 is an insulating heating wire.

Further preferably, the connection ports 1222 are preferably pins, and two sets are provided. One end of one set of pins passes through the adapter PCBA board to connect to the heating wire, which simplifies the line connection, and the other end is connected to the connection hole of the ventilator connector. The breathing circuit interface PCBA board 111 and the main control PCBA board are connected to the breathing circuit interface PCBA board 111; one end of the other set of pins is fixedly connected with the adapter PCBA board 1221, and the other end is also connected to the breathing circuit with the connection hole of the ventilator connector The interface PCBA board 111 is connected to the main control PCBA board through the breathing circuit interface PCBA board 111.

Furthermore, one of the two sets of connection ports 1222 is connected to the pipeline temperature sensing element, and the other is connected to the pipeline heating element. The connection port 1222 can also be another set of temperature sensors in the breathing circuit, such as the gas temperature of the patient interface of the breathing circuit, to further control and monitor the temperature of the gas in the circuit.

This embodiment only uses two sets of connection ports 1222, which simplifies the pipeline design. The connection ports are directly arranged on the adapter PCBA board 1221, which can ensure the relative position of the connectors, facilitate processing during encapsulation, and ensure that the temperature sensor senses Accuracy.

Furthermore, the connection ports 1222 are all electrically connected to the adapter PCBA board 1221.

Furthermore, as shown in FIG. 3, the connection between the adapter body 1 and the adapter PCBA board 1221 is provided with a PCBA encapsulation 124 that can fix the two. The adapter PCBA board 1221 is embedded in the PCBA encapsulation 124 with the adapter. The main body 121 is fixedly connected, and the PCBA encapsulation 124 is preferably made of an insulating material.

Furthermore, the adapter body 121 is a part of the consumables for the breathing circuit, and the adapter body 121 is the same as the consumables used for the breathing circuit, which can further reduce the cost of use.

Furthermore, the adapter main body 121 is made of consumables, the consumables are made of the same material as the breathing tube, and the parts made with the consumables include: the breathing tube adapter 12, the tube, the tube heating wire, and Interface between pipeline and patient. Because the same consumables are used for production, the cost is reduced.

In this embodiment, the adapter PCBA board 1221 is built in the adapter body 121, and the connection ports 1222 are respectively electrically connected to the breathing circuit interface PCBA board 111, so that the temperature of the gas entering the adapter body can be measured, and it can be used in a patient. It can be replaced directly after it is finished, without disinfection, to prevent cross-infection.

More preferably, the adapter body 112 is assembled by the first connecting end 1211 and the second connecting end 1212.

Further, one end of the first connecting end 1211 is set in a circular tube shape for connecting to a breathing tube, and the bottom of the other end is provided with a hook 12111, which is arranged on the bottom edge of the first connecting end 1211, and the direction is outward. Triangular or trapezoidal protrusions are used for interference fit with the slot 127 on the second connecting end 1212 (see Figure 2) to achieve the purpose of fixed connection. The mechanical locking mechanism ensures the reliability of the connection, prevents falling off and ensures air tightness .

In this embodiment, the adapter body 1 is designed in sections into the first connection end 1211 and the second connection end 1212, and is mechanically connected by a hook 12111, which is convenient for disassembly, easy replacement and maintenance, and the first connection end 1211 or the second connection end 1211 If any one of the two connecting ends 1212 is damaged, it can be directly thrown away as a consumable without affecting the use of the other, which is convenient to use and reduces costs.

The first connecting end 1211 is used to connect the adapter body 121 to the air path of the ventilator through the breathing tube, and the second connecting end 1212 is used to fix the adapter body 121 to the connecting hole provided on the breathing tube interface 11.

Furthermore, the inner diameters of both ends of the connector body 1 are tapered, which means that when the humidification tank or the humidification irrigation interface and the breathing pipeline are connected, the air path can be sealed by forming an interference fit with the tapered structure.

For specific use/implementation, the PCBA board 1221 is placed in the mounting slot 1133 of the second connection end 1212, and the PCBA encapsulation 124 is fixed, and the second connection end 1212 and the first connection end 1211 pass through the slot 127 and the hook 12111 One end of the heating wire 123 is connected to a set of connecting ports 1222, and the other end of the heating wire 123 extends into the breathing circuit through the first connecting end 1211. The air path in the breathing circuit can be heated.

When using the present invention, the first connecting end 1211 is in interference fit with the breathing tube through its tapered inner diameter, and the second connecting end 1212 is fixedly connected to the ventilator host through the buckle 126 to ensure that the connecting port 1222 is connected to the breathing tube. The relative position of the connection hole on 11.

During use, the present invention uses the breathing circuit interface PCBA board 111 connected to the connection port 1222 to perform temperature monitoring and control, and the breathing circuit interface PCBA board 111 connected to the connection port 1222 to perform heating control, so as to achieve monitoring and control in the pipeline. The purpose of the temperature.

Example 3

13, the difference from the above-mentioned embodiment is that a flow sensor 65 is provided between the fan assembly 4 and the humidification tank assembly 3, and the flow sensor 65 is used to measure the amount of gas entering the humidification tank assembly 3 from the fan assembly 4 An oxygen concentration sensor 61 is provided between the flow sensor 65 and the fan assembly 4, and the oxygen concentration sensor 61 is used to measure the oxygen concentration of the gas in the fan assembly 4; a pressure sensor is provided between the flow sensor 65 and the humidification tank assembly 3 62. The pressure sensor 62 is used to monitor the pressure in the pipeline; a temperature sensor is also provided between the humidification tank assembly 3 and the breathing pipeline; the sensor is not limited to the above sensors, and environmental temperature and humidity sensors can also be provided.

Preferably, the temperature sensor includes: an intake air temperature sensor 63 and an outlet air temperature sensor 64 respectively arranged at the intake end of the breathing pipeline.

Further preferably, the value obtained by the above-mentioned sensor can accurately measure the pressure of the patient interface, the pipeline model can be identified according to the PCBA interface in the pipeline, and the pipeline diagram and the pipeline can be identified according to the relationship between pressure and flow. The characteristics of the patient interface, such as aerodynamic resistance;

One method of identifying the pipeline model can be: there is a thermistor (such as thermistor) used to measure temperature in the PCBA, and thermistors with different resistance values at the same temperature can be embedded in different pipelines. For example, the resistance at 25 degrees Celsius can be 10Kohm, 20Kohm.

Another method of pipeline identification can be: Install electronic components that indicate the pipeline model information in the PCBA, such as EEPROM, and the ventilator/humidifier can read the information in the PCBA to determine the pipeline model.

Because the difference between different resistance values is much greater than the thermistor's change in the equipment's working range, the equipment can automatically identify the models of different pipelines.

The measurement methods of patient interface features are as follows:

The variables are shown in the following table:

variable name	description
Q	Humidification tank flow
Pin	Humidification tank pressure
T1	Pipe inlet temperature
T2	Pipeline outlet temperature
DP	Pipeline pressure drop
Rcircuit	Pipeline resistance characteristics
Ppatient	Patient interface pressure
Ppatientmsmt	Estimated patient interface pressure
Qmsmt	Humidification tank flow measurement value
Pinmsmt	Humidification tank pressure measurement value
T1msmt	Measured value of pipe inlet temperature
T2msmt	Measured value of pipe outlet temperature
DPmsmt	Measured value of pipeline pressure drop

Rcircuitest	Estimated value of pipeline resistance characteristics
Ppatient	Patient interface pressure
Ppatientmsmt	Estimated patient interface pressure

Among them, the pressure on the patient end of the ventilator satisfies the following relationship:

Pin=Ppatient+DP;

Among them, DP is a variable related to flow, temperature, humidity and pipeline type;

DP=f(Q, T1, T2, Rcircuit).

Among them, the function can be derived from the physical properties of the gas, or it can be regressed from experimental data:

A simple model is DP=Rcircuit*Q;

Another quadratic model is DP=Rcircuit(1)*Q^2+Rcircuit(2)*Q.

When the pipeline and breathing interface are not connected to the patient:

Ppatient=0;

Pin=DP;

We have Pin=f(Q, T1, T2, Rcircuit).

We can estimate the pipeline characteristics from the relationship between different flow rates and pressures, such as by:

Rcircuitest=f ^-1 (pinmsmt, Qmsmt, T1msmt, T2msmt);

Different pipeline types can be judged by different Rcircuit.

When running in the ventilator, the pressure, flow, and temperature measurement can accurately estimate the resistance of the gas in the pipeline, thereby accurately measuring the pressure under the patient interface.

Same as above:

Pin=Ppatient+DP;

If the characteristic of the pressure drop of the guide line is the pressure at the patient interface of Rcircuit:

Ppatient=Pin–DP

During operation, the pressure at the patient interface can be estimated as:

Ppatientmsmt=Pinmsmt-f(Qmsmt, T1msmt, T2msmt, Rcircuitest),

In addition, it can also be used to identify the pipeline falling off, air leakage and blockage, and improve safety.

In addition, when the pipeline falls off, leaks and blocks:

Pin≠Ppatient+DP

According to the different conditions of the inequality, we can identify the state of the pipeline falling off, leaking and clogging,

For example, when Pin>Ppatient+DP, it can be judged that the humidification tank pressure is greater than the sum of the patient interface pressure and the pipeline pressure drop, and then it can be judged that the pipeline is blocked.

A method of identifying blockages in a pipeline is described as follows:

1. Calculate the pressure drop of the normal pipeline according to the known pipeline property test:

DPnom=f(Qmsmt, T1msmt, T2msmt, Rcircuitest);

2. If the actual measured pressure of the humidification tank is too high, if the following conditions are met:

During the continuous Tocclusion period, Pinmsmt>α*(DPnom+PpatientMax), it can be judged that the pipeline is blocked.

Among them, PrepatientMax is the maximum patient interface pressure; Tocclusion is the alarm delay design parameter, and α is the blockage alarm threshold parameter. Parameters can be adjusted according to actual needs to ensure alarm sensitivity and avoid false alarms.

A method of identifying air leaks in a pipeline is described as follows:

1. Calculate the pressure drop of the normal pipeline according to the known pipeline property test:

DPnom=f(Qmsmt, T1msmt, T2msmt, Rcircuitest);

2. If the actual measured pressure of the humidification tank is too high, if the following conditions are met:

In the continuous Thighleak time, Pinmsmt<β*(DPnom), it can be judged that the pipeline leakage is too large.

Among them, Thighleak is the alarm delay design parameter, and β is the air leakage alarm threshold parameter. Parameters can be adjusted according to actual needs to ensure alarm sensitivity and avoid false alarms.

The above method of identifying air leakage in the pipeline can also be used to determine whether the pipeline falls off, for example: Pinmsmt<0.1*β*(DPnom) within the continuous Thighleak time.

The above descriptions are only preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (13)

1. A breathing pipeline interface, comprising an air inlet connector and an air outlet connector, characterized in that the air inlet connector and the air outlet connector are fixedly connected by a connecting piece, and a detection device is embedded in the air outlet connector, and the detection device It is used to detect various parameters of the gas in the gas outlet connector, including temperature, pressure and oxygen concentration.
2. The breathing circuit interface according to claim 1, wherein the detection device comprises: a breathing circuit interface PCBA board and/or a sensor.
3. The breathing circuit interface according to claim 2, wherein the air outlet connector comprises a humidification tank air outlet for connecting the air outlet of the humidification tank, a breathing tube air inlet for connecting the breathing tube, and an air inlet for connecting the air outlet of the humidification tank. Embedded in the mounting groove of the breathing circuit interface PCBA board.
4. The breathing circuit interface according to claim 1, wherein the air inlet connector comprises a ventilator air outlet for connecting the air outlet of the ventilator and a humidifying tank air inlet for connecting to the air inlet of the humidifying tank.
5. The breathing circuit interface according to claim 3, wherein the installation groove is perpendicular to the air outlet connector, and the installation groove is also provided with a connection hole for electrical connection with the breathing circuit, and the connection The hole is arranged in the same direction as the air inlet of the breathing pipeline.
6. The breathing tube interface according to any one of claims 1 to 4, wherein the connecting member is a hollow structure, and a reinforcing rib for increasing the strength of the connecting member is provided inside the hollow structure.
7. The breathing circuit interface according to claim 2, wherein a pin socket is provided on the breathing circuit interface PCBA board, and the pin socket is arranged in the same direction as the air inlet of the breathing circuit.
8. A ventilator includes a housing provided on the outside, a humidification tank assembly provided on the housing, a fan assembly provided in the housing, a power supply assembly provided under the fan assembly in the housing, and A breathing line connector used for connecting a breathing line on the humidification tank assembly;

   Wherein, the breathing circuit connection piece is provided with a detection device, which includes a PCBA board and/or a sensor, and information collection and information transmission in the breathing pipeline are realized through the PCBA board and/or sensor.
9. The ventilator according to claim 8, wherein the breathing circuit connector comprises: a breathing circuit interface arranged on the humidification tank assembly for connecting the humidification tank assembly and the breathing circuit, and a breathing circuit interface arranged on the humidification tank assembly. The breathing tube interface is used to connect the breathing tube and the breathing tube adapter; wherein, the breathing tube interface is provided with a breathing tube interface PCBA board and/or a sensor for Detect various parameters of the gas in the gas outlet connector, including but not limited to: temperature, humidity, pressure, and oxygen concentration;

   The breathing tube interface and the breathing tube adapter are made of consumables, the fan assembly and the breathing tube interface are connected through a one-way valve, and a sealing ring is provided at the connection.
10. The ventilator according to claim 9, wherein a flow sensor is provided between the fan assembly and the humidification tank assembly, and the flow sensor is used to measure the flow rate from the fan assembly into the humidification tank assembly. The amount of gas, an oxygen concentration sensor is provided between the flow sensor and the fan assembly, and the oxygen concentration sensor is used to measure the oxygen concentration of the gas in the fan assembly; between the flow sensor and the humidification tank assembly A pressure sensor is arranged between the pressure sensor for monitoring the pressure in the pipeline; a temperature sensor is also arranged between the humidification tank assembly and the breathing pipeline.
11. The ventilator according to any one of claims 8 to 10, wherein the breathing tube connector further comprises a breathing tube adapter, and the breathing tube adapter includes: an adapter body and an adapter body arranged on the adapter. The control device on the main body is characterized in that the control device includes an adapter PCBA board and a connection port arranged on the adapter PCBA board, and the connection port is used for electrical connection with the breathing circuit interface PCBA board.
12. The ventilator according to any one of claims 8 to 10, further comprising a breathing circuit identification method: a thermal element (such as a thermistor) for measuring temperature is provided on the PCBA board, and each model The pipeline corresponds to embedded thermistors with different resistance values at the same temperature. The PCBA board can identify different pipeline models through the resistance range of the thermal element.
13. The ventilator according to any one of claims 8 to 10, further comprising a breathing circuit identification method: according to the relationship between pressure and flow, the characteristics of the breathing circuit diagram and the patient interface can be identified, And further identify the models of different pipelines.

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