Heating device for respiratory gas probe and anaesthesia machine

Abstract

The invention relates to the technical field of medical instruments, in particular to a heating device for a respiratory gas probe and an anaesthesia machine, and the heating device comprises a probe seat which is used for bearing an inspiration probe and / or an expiration probe; the heating film is tightly attached to the probe seat; the heating lining plate is used for fixing the probe seat and the heating film together; when the internal temperature is equal to or higher than a first threshold value, the heating film stops heating; and when the internal temperature is equal to or lower than a second threshold value, the heating film starts to heat, so that the inspiration probe and / or the expiration probe in the probe seat are / is ensured to work in a preset temperature interval, water vapor condensation is avoided, and monitoring and control of the tidal volume of the inspiration probe and / or the expiration probe are improved.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a heating device for a respiratory gas probe and an anesthesia machine. Background Art

[0002] With the development of medical technology, the precision of anesthesia in surgery is getting higher and higher. The anesthesia machine needs to accurately control and monitor the patient's tidal volume, pressure and other parameters to ensure that the user is at the appropriate depth of anesthesia during use. The differential pressure sensor in the inspiratory and expiratory probe can accurately calculate parameters such as gas flow by measuring the pressure difference, providing data support for the precise control of anesthesia.

[0003] The accuracy of the differential pressure sensor first comes from the collection system of the differential pressure sensor. The collection system of the differential pressure sensor has two collection ports. When the exhaled gas of the user enters from the air inlet, the ultra-thin elastic diaphragm creates a difference between the two pressures before and after the diaphragm, and outputs the collection signal to the electronic components through the two sampling ports before and after, and then the user's exhaled tidal volume is calculated.

[0004] However, the acquisition system of the differential pressure sensor also faces technical challenges in actual operation. Since the gas exhaled by the user is saturated water vapor at about 37°C, and the indoor temperature of the anesthesia operating room is 20-23°C, the gas exhaled by the user will condense water vapor near the sampling port of the probe in the anesthesia breathing circuit, which greatly reduces the sampling accuracy near the sampling port, further affecting the monitoring and control of tidal volume.

[0005] In the existing design, such as the heating rod assembly provided by CN116249234A, the circuit heating system of the anesthesia machine can be heated, but the heating rod is inserted into the whole anesthesia breathing circuit for heating, and the probe sampling port position cannot be directly heated, which affects the temperature control accuracy. In addition, this structure is suitable for the aluminum alloy design breathing circuit of the anesthesia machine, but not for the plastic circuit, and has low versatility.

[0006] Therefore, the problem of preventing water vapor from condensing near the sampling port of the probe needs to be solved urgently, so as to improve the sampling accuracy near the sampling port and improve the overall performance and user experience of the anesthesia machine. Summary of the invention

[0007] The purpose of the present invention is to overcome the above-mentioned defects of the prior art, thereby providing a heating device for a respiratory gas probe and an anesthesia machine.

[0008] In order to solve the above technical problems, the technical solution of the present invention provides a heating device for a respiratory gas probe, wherein the respiratory gas probe comprises: an inhalation probe and an exhalation probe; the heating device comprises:

[0009] A probe seat, used for accommodating the inhalation probe and / or the exhalation probe;

[0010] A heating film is closely attached to the probe seat;

[0011] A heating liner, used to fix the probe seat and the heating film together;

[0012] When the internal temperature is equal to or higher than a first threshold, the heating film stops heating; when the internal temperature is equal to or lower than a second threshold, the heating film starts heating, thereby ensuring that the inhalation probe and / or exhalation probe in the probe seat operates within a predetermined temperature range to avoid condensation of water vapor, thereby improving the monitoring and control of the tidal volume of the inhalation probe and / or exhalation probe.

[0013] As an improvement of the above device, the heating film is located below the probe seat; the heating lining plate is located below the heating film and connected to the probe seat, so as to tighten the heating film between the heating lining plate and the probe seat.

[0014] As an improvement of the above-mentioned device, the device also includes: at least one temperature sensor, which is used to monitor the internal temperature of the probe seat. When the internal temperature monitored by any temperature sensor is higher than a first threshold, the heating film stops heating; when the internal temperature monitored by any temperature sensor is lower than a second threshold, the heating film starts heating; wherein the heating film and the temperature sensor are separated by an inhalation probe or an exhalation probe.

[0015] As an improvement of the above device, the device also includes: a heating cable assembly and a connector, which are used to provide electrical connection and communication connection between the heating film and the anesthesia machine body, and also to provide electrical connection and communication connection between the temperature sensor and the anesthesia machine body.

[0016] As an improvement of the above device, the heating cable assembly includes: a first cable, a second cable, a third cable and a stainless steel protective tube, wherein:

[0017] The first ends of the first cable, the second cable and the third cable are covered with a stainless steel protective tube and are welded to the temperature sensor, and the second ends of the first cable, the second cable and the third cable are welded to the joint;

[0018] The heating cable assembly further comprises: two second cables, a fourth cable and a self-recovering circuit breaker; the heating film is provided with a first power line and a second power line; wherein,

[0019] A first end of the first second cable is welded to the first power line of the heating film, and a second end is welded to the pin of the connector;

[0020] The first end of the second second cable is connected to the second power line of the heating film, and the second end is welded to the first pin of the resettable circuit breaker; the second pin of the resettable circuit breaker is welded to the first end of the fourth cable, and the second end of the fourth cable is welded to the pin of the connector; the resettable circuit breaker is located in the probe seat, and when the temperature is equal to or higher than the third threshold value, the resettable circuit breaker is disconnected, thereby disconnecting the power supply to the heating film and stopping the heating film from heating; when the temperature is lower than the third threshold value, the resettable circuit breaker is connected, thereby supplying power to the heating film and starting to heat the heating film; wherein, the heating film and the resettable circuit breaker are separated by an inhalation probe or an exhalation probe.

[0021] As an improvement of the above device, the heating cable assembly also includes: a heat shrink tube and a sealant; the heat shrink tube is used to reinforce the welding connection position after heating, and the sealant is applied to the temperature sensor to seal and protect the wiring part of the temperature sensor.

[0022] As an improvement of the above device, the device further includes: a fixing plate for fixing the temperature sensor and the resettable circuit breaker inside the probe seat.

[0023] As an improvement of the above device, the inhalation probe and the exhalation probe are respectively located in different probe seats.

[0024] As an improvement of the above-mentioned device, the inhalation probe and the exhalation probe are respectively provided with a sampling connector, a low-pressure sampling port and a high-pressure sampling port; the probe seat is provided with sampling openings corresponding to the positions of the sampling connector, the low-pressure sampling port and the high-pressure sampling port respectively; the probe seat is also provided with a guide groove, and the guide groove is the same as the direction of the inhalation probe or the exhalation probe when entering the probe seat, and is used to provide guidance.

[0025] To achieve another object of the present invention, the present invention further provides an anesthesia machine, comprising the above-mentioned heating device for a respiratory gas probe.

[0026] Compared with the prior art, the advantage of the present invention is that the heating device and anesthesia machine for the respiratory gas probe provided by the present invention significantly improves the versatility of the heating structure by directly applying the heating function to the expiratory probe and the inspiratory probe instead of the traditional overall heating anesthesia breathing circuit, and can ensure that the expiratory probe and the inspiratory probe operate within a predetermined temperature range to avoid water vapor condensation, thereby improving the monitoring and control of the tidal volume of the inspiratory probe and / or the expiratory probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A three-dimensional diagram of a heating device for a respiratory gas probe according to Embodiment 1 of the present invention;

[0028] Figure 2is a cross-sectional view of a heating device for a respiratory gas probe;

[0029] Figure 3 Schematic diagram of the connection of the heating cable assembly. DETAILED DESCRIPTION

[0030] The technical solution provided by the present invention is further described below in conjunction with embodiments.

[0031] Example 1

[0032] The heating device for the respiratory gas probe provided in this embodiment is as follows: Figure 1 and Figure 2 As shown, it includes: an exhalation probe seat 20101, an inhalation probe seat 20102, an exhalation probe 20103, an inhalation probe 20104, a heating lining plate 20105, a fastening screw 20106, a fixing plate 20107, a heating cable assembly 20108, a sampling connector 20109, a 10P male connector 201010, a heating film 5, a self-resetting circuit breaker 6, a temperature sensor 9 and a 10P female connector 10. The inhalation probe seat 20102 is placed above the heating film 5 and the heating lining plate 20105, and then the exhalation head seat 20101, the inhalation probe seat 20102 and the heating film 5 are fixed above the heating lining plate 20105 by fastening screws 20106 under the heating lining plate 20105.

[0033] The 10P male connector 201010, the 10P female connector 10 and the heating cable assembly 20108 are used to provide electrical connection and communication connection between the heating film 5 and the anesthesia machine body.

[0034] like Figure 2 As shown, the exhalation probe 20103 and the inhalation probe 20104 are respectively provided with a sampling connector 20109, a low-pressure sampling port 20103a and a high-pressure sampling port 20103b, and are respectively installed with an ultra-thin elastic diaphragm 20103c.

[0035] The ultra-thin elastic diaphragm 20103c is clamped in the exhalation probe 20103 and the inhalation probe 20104 respectively. Figure 2The ultra-thin elastic membrane 20103c of the exhalation probe 20103 is shown. The temperature control of the exhalation probe 20103 will be described below as an example. The temperature control of the inhalation probe 20104 can be controlled in the same way. When the temperature in the exhalation probe seat 20101 collected by the temperature sensor 9 is lower than 40°C, the heating film 5 starts to work, and when the temperature in the exhalation probe seat 20101 collected by the temperature sensor 9 exceeds 40°C, the heating film 5 stops working, so that the exhalation probe 20103 works within the temperature range of 30 to 40°C, so that there is no water vapor condensation on the ultra-thin elastic membrane 20103a, and the temperature of the exhalation probe 20103 does not exceed 41°C. In this embodiment, two temperature sensors 9 are provided. When the temperature collected by any one of the temperature sensors 9 is higher than the first threshold of 40°C or lower than the second threshold of 36°C, the heating film 5 can be controlled to start and stop, thereby increasing the reliability of temperature control. At the same time, when one temperature sensor 9 is damaged, the other temperature sensor 9 can continue to detect the temperature, thereby increasing the safety of temperature control. In order to further increase the safety of temperature control, this embodiment also adds a self-resetting circuit breaker 6 between the heating film 5 and the power supply. The self-resetting circuit breaker 6 is also located in the breath probe holder 20101. The fuse temperature of the self-resetting circuit breaker 6 is 41°C. When the temperature in the breath probe holder 20101 reaches 41°C, the self-resetting circuit breaker 6 is disconnected, thereby disconnecting the electrical connection between the heating film 5 and the power supply, thereby avoiding excessive temperature in the breath probe holder 20101 caused by the continuous operation of the heating film 5. Figure 1 As shown, during installation, a resettable circuit breaker 6 and two temperature sensors 9 are respectively inserted into the corresponding installation holes above the exhalation probe holder 20101, and then the resettable circuit breaker 6 and the two temperature sensors 9 are covered with a fixing plate 20107 to reduce the heat exchange between the internal temperature of the exhalation probe holder 20101 and the outside world, and then fixed with a fastening screw 20106.

[0036] The exhalation probe 20103 and the inhalation probe 20104 are respectively inserted into the exhalation probe seat 20101 and the inhalation probe seat 20102. The exhalation probe seat 20101 is provided with a guide groove, through which the low-pressure sampling port 20103a and the high-pressure sampling port 20103b in the exhalation probe 20103 are respectively connected to the corresponding sampling openings of the exhalation probe seat 20101. The inhalation probe seat 20102 may also be provided with a guide groove and a sampling opening.

[0037] like Figure 3 As shown, the heating cable assembly 20108 includes two first cables 1, two second cables 2, two third cables 3, one fourth cable 4, two stainless steel protective tubes 7, sealant 8, several first heat shrink tubes 11, one second heat shrink tube 12 and a self-resetting circuit breaker 6.

[0038] The temperature sensor 9 is connected to the 10P female connector 10 through the heating cable assembly 20108. The specific connection method is: a stainless steel protective tube 7 is put on the first end of a first cable 1, a second cable 2 and a third cable 3, and the first ends of the first cable 1, the second cable 2 and the third cable 3 are added with a first heat shrink tube 11 and then welded to a temperature sensor 9, and the second ends of the first cable 1, the second cable 2 and the third cable 3 are added with a first heat shrink tube 11 and then welded to the 10P female connector 10, and then after applying a proper amount of sealant 8 to the tail of the temperature sensor 9, the first heat shrink tube 11 at the first end of the first cable 1, the second cable 2 and the third cable 3 is heated to fix them, and the first heat shrink tube 11 at the second end of the first cable 1, the second cable 2 and the third cable 3 is continued to be heated, so that the second ends of the first cable 1, the second cable 2 and the third cable 2 are fixed to the tail end of the 10P female connector 10. Figure 3 Two temperature sensors 9 are shown in FIG. 1 , and another temperature sensor 9 adopts the same connection method.

[0039] The heating film 5 is connected to the 10P female connector 10 through the heating cable assembly 20108, and a self-resetting circuit breaker 6 is also provided between the heating film 5 and the 10P female connector 10. The specific connection method is: the heating film 5 has two power cords, namely the first power cord and the second power cord, and the welding method is: the second heat shrink tube 12 is installed at the first end of a second cable 2, and the first heat shrink tube 11 is installed at the second end of the second cable 2. The first end of the second cable 2 is welded and connected to the first power cord of the heating film 5, and the second heat shrink tube 12 is heated to fix the welding position. The second end of the second cable 2 is welded and connected to the pin of the 10P female connector 10, and the first heat shrink tube 11 is heated to fix the welding position.

[0040] The second power line of the heating film 5 is welded to the first end of another second cable 2 and then heated and fixed in the welding position by the first heat shrink tube 11. The second end of the second cable 2 is welded to the first pin of the resettable circuit breaker 6 and then heated and fixed in the welding position by the first heat shrink tube 11. The second pin of the resettable circuit breaker 6 is welded to the first end of a fourth cable 4 and then heated and fixed in the welding position by the first heat shrink tube 11. The second end of the fourth cable 4 is welded to the pin of the 10P female connector 10 and then heated and fixed in the welding position by the first heat shrink tube 11.

[0041] In this embodiment, the heating film 5 and the temperature sensor 9 are separated by the inhalation probe 20104 or the exhalation probe 20103, and the heating film 5 and the resettable circuit breaker 6 are also separated by the inhalation probe 20104 or the exhalation probe 20103, thereby separating the heating film 5 from the positions of the temperature sensor 9 and the resettable circuit breaker 6. That is to say, the heating film 5 needs to heat the inhalation probe 20104 or the exhalation probe 20103 before the temperature sensor 9 can collect the threshold temperature. This embodiment is explained by taking the exhalation probe 20103 as an example: in this embodiment, the heating film 5 is at the bottom, located below the exhalation probe 20103; the temperature sensor 9 and the self-resetting circuit breaker 6 are at the top, and both are at the upper end of the exhalation probe 20103; in other embodiments, the temperature sensor 9 and the self-resetting circuit breaker 6 can also be placed at the upper end of the inhalation probe 20104, and the heating film 5 is located at the lower end of the exhalation probe 20103; in addition, the heating film 5 can also be above the inhalation probe 20104 or the exhalation probe 20103, and the temperature sensor 9 and the self-resetting circuit breaker 6 can be at the lower end of the inhalation probe 20104 or the exhalation probe 20103.

[0042] Installation method:

[0043] First, place the expiratory head seat 20101 and the inhalation probe seat 20102 above the heating film 5 and the heating lining plate 20105 respectively, and then fix the expiratory head seat 20101, the inhalation probe seat 20102 and the heating film 5 above the heating lining plate 20105 under the heating lining plate 20105 with the fastening screws 20106; then insert the self-resetting circuit breaker 6 and the two temperature sensors 9 into the mounting holes above the expiratory head seat 20101 respectively, then cover the self-resetting circuit breaker 6 and the two digital temperature sensors 9 with the fixing plate 20107, and then fix them with the fastening screws 20106; then insert the expiratory probe 20103 and the inhalation probe 20104 into the 20101 expiratory probe seat and the 20102 inhalation probe seat respectively; the 10P female connector 10 is installed on the whole machine of the anesthesia machine to supply power to the heating device and related cables for signal acquisition (not shown in the figure). When the anesthesia breathing circuit equipped with the heating device for the inhalation and exhalation probe is correctly installed, the relevant circuit of the 10P male connector 201010 is installed on the anesthesia machine, and the 10P female connector 10 and the 10P male connector 201010 are plugged in and powered, and the heating device works. At this time, since there is no condensation of water vapor, it will not affect the gas sampling accuracy of the low-pressure sampling port 20103a and the high-pressure sampling port 20103b, which can greatly improve the sampling accuracy of the existing sampling scheme and reduce unnecessary power consumption.

[0044] Example 2

[0045] This embodiment provides an anesthesia machine, including the heating device for the respiratory gas probe provided in Embodiment 1.

[0046] In the existing design, CN116249234A usually uses a heating rod inserted into the entire anesthesia breathing circuit for heating. Since the anesthesia breathing circuit is designed with aluminum alloy, this structure is not suitable for plastic circuits and has low versatility. The present invention directly adopts the heating form of the inhalation and exhalation probe, which improves the temperature control accuracy. The heating power consumption of the anesthesia breathing circuit as a whole is much greater than the heating of the inhalation and exhalation probe alone, which reduces resource consumption. At the same time, the versatility of the heating structure is greatly increased. The device structure of the present invention is original. This improved design significantly improves the practicality and safety of the heating device, making it more adaptable to the strict requirements of the medical environment.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention is described in detail with reference to the embodiments, it should be understood by those skilled in the art that any modification or equivalent replacement of the technical solutions of the present invention does not depart from the spirit and scope of the technical solutions of the present invention and should be included in the scope of the claims of the present invention.

Claims

1. A heating device for a respiratory gas probe, the respiratory gas probe comprising: Inspiratory probe and expiratory probe; The heating device comprises: A probe seat, used for accommodating the inhalation probe and / or the exhalation probe; A heating film is closely attached to the probe seat; A heating liner, used to fix the probe seat and the heating film together; When the internal temperature is equal to or higher than a first threshold, the heating film stops heating; when the internal temperature is equal to or lower than a second threshold, the heating film starts heating, thereby ensuring that the inhalation probe and / or exhalation probe in the probe seat operates within a predetermined temperature range to avoid condensation of water vapor, thereby improving the monitoring and control of the tidal volume of the inhalation probe and / or exhalation probe.

2. The heating device for a respiratory gas probe according to claim 1, characterized in that: The heating film is located below the probe seat; the heating lining plate is located below the heating film and is connected to the probe seat, and is used to tighten the heating film between the heating lining plate and the probe seat.

3. The heating device for a respiratory gas probe according to claim 1, characterized in that: Also includes: At least one temperature sensor is used to monitor the internal temperature of the probe seat. When the internal temperature monitored by any temperature sensor is higher than a first threshold, the heating film stops heating. When the internal temperature monitored by any temperature sensor is lower than a second threshold, the heating film starts heating. The heating film and the temperature sensor are separated by an inhalation probe or an exhalation probe.

4. The heating device for a respiratory gas probe according to claim 3, characterized in that: Also includes: The heating cable assembly and the connector are used to provide electrical connection and communication connection between the heating film and the anesthesia machine body, and also to provide electrical connection and communication connection between the temperature sensor and the anesthesia machine body.

5. The heating device for a respiratory gas probe according to claim 4, characterized in that: The heating cable assembly comprises: a first cable, a second cable, a third cable and a stainless steel protective tube, wherein: The first ends of the first cable, the second cable and the third cable are covered with a stainless steel protective tube and are welded to the temperature sensor, and the second ends of the first cable, the second cable and the third cable are welded to the joint; The heating cable assembly further comprises: two second cables, a fourth cable and a self-recovering circuit breaker; the heating film is provided with a first power line and a second power line; wherein, A first end of the first second cable is welded to the first power line of the heating film, and a second end is welded to the pin of the connector; The first end of the second second cable is connected to the second power line of the heating film, and the second end is welded to the first pin of the resettable circuit breaker; the second pin of the resettable circuit breaker is welded to the first end of the fourth cable, and the second end of the fourth cable is welded to the pin of the connector; the resettable circuit breaker is located in the probe seat, and when the temperature is equal to or higher than the third threshold value, the resettable circuit breaker is disconnected, thereby disconnecting the power supply to the heating film and stopping the heating film from heating; when the temperature is lower than the third threshold value, the resettable circuit breaker is connected, thereby supplying power to the heating film and starting to heat the heating film; wherein, the heating film and the resettable circuit breaker are separated by an inhalation probe or an exhalation probe.

6. The heating device for a respiratory gas probe according to claim 5, characterized in that: The heating cable assembly also includes: a heat shrink tube and a sealant; the heat shrink tube is used to reinforce the welding connection position after heating, and the sealant is applied to the temperature sensor to seal and protect the wiring part of the temperature sensor.

7. The heating device for a respiratory gas probe according to claim 5, characterized in that: Also includes: A fixing plate is used to fix the temperature sensor and the resettable circuit breaker inside the probe seat.

8. The heating device for a respiratory gas probe according to claim 1, characterized in that: The inhalation probe and the exhalation probe are respectively located in different probe seats.

9. The heating device for a respiratory gas probe according to claim 1, characterized in that: The inhalation probe and the exhalation probe are respectively provided with a sampling connector, a low-pressure sampling port and a high-pressure sampling port; the probe seat is provided with sampling openings corresponding to the positions of the sampling connector, the low-pressure sampling port and the high-pressure sampling port respectively; the probe seat is also provided with a guide groove, which is the same as the direction of the inhalation probe or the exhalation probe when entering the probe seat, and is used to provide guidance.

10. An anesthesia machine, characterized in that: A heating device for a respiratory gas probe comprising any one of claims 1-9.

Images