A heating device for a respiratory gas probe and an anaesthesia machine

Abstract

The present application relates to the technical field of medical apparatus, in particular to a heating device for breathing gas probe and an anesthesia machine, comprising: a probe seat for accommodating the inhalation probe and / or exhalation probe; a heating film closely attached to the probe seat; a heating lining plate 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; when the internal temperature is equal to or lower than a second threshold value, the heating film starts heating, so as to ensure that the inhalation probe and / or exhalation probe in the probe seat work within a predetermined temperature range, avoid water vapor condensation, and further improve the monitoring and control of the tidal volume of the inhalation probe and / or exhalation probe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a heating device for a breathing gas probe and an anesthesia machine. BACKGROUND

[0002] With the development of medical technology, the accuracy of anesthesia required by surgery is getting higher and higher. The anesthesia machine needs to accurately control and monitor the tidal volume, pressure and other parameters of the patient to ensure that the user is in the appropriate depth of anesthesia during use, and the pressure difference sensor in the inhalation and exhalation probe can accurately calculate the gas flow and other parameters by measuring the pressure difference, providing data support for the accurate control of anesthesia.

[0003] The accuracy of the pressure difference sensor comes from the acquisition system of the pressure difference sensor. The acquisition system of the pressure difference sensor has two acquisition ports. When the user exhales gas from the gas inlet, the ultra-thin elastic diaphragm causes the pressure difference between the front and back of the diaphragm, and the acquisition signal is output to the electronic element through the front and back sampling ports, and then the user's exhalation tidal volume is calculated.

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

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

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

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

[0008] To solve the above technical problems, the technical scheme of the present application provides a heating device for a breathing gas probe, which comprises: an inhalation probe and an exhalation probe; the heating device comprises:

[0009] a probe seat for accommodating the inhalation probe and / or the exhalation probe;

[0010] a heating film, which is close to the probe seat;

[0011] a heating lining, which is 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 value, the heating film stops heating; when the internal temperature is equal to or lower than a second threshold value, the heating film starts heating, so as to ensure that the breath in probe and / or breath out probe in the probe seat work within a predetermined temperature range, avoid water vapor condensation, and thus improve the monitoring and control of the breath in probe and / or breath out probe moisture content.

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

[0014] As an improvement of the above device, the device further comprises at least one temperature sensor, which is used to monitor the internal temperature of the probe seat; when the internal temperature monitored by any one of the temperature sensors is higher than a first threshold value, the heating film stops heating; when the internal temperature monitored by any one of the temperature sensors is lower than a second threshold value, the heating film starts heating; wherein the heating film and the temperature sensor are separated by the breath in probe or the breath out probe.

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

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

[0017] the first end of the first cable, the second cable and the third cable is sleeved with the stainless steel protection tube and is welded with the temperature sensor; the second end of the first cable, the second cable and the third cable is welded with the connector;

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

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

[0020] The first end of the second cable is connected with the second power line of the heating film, and the second end is welded with the first pin of the self-resetting circuit breaker; the second pin of the self-resetting circuit breaker is welded with the first end of the fourth cable, and the second end of the fourth cable is welded with the pin of the joint; the self-resetting circuit breaker is located in the probe seat, when the temperature is equal to or higher than the third threshold value, the self-resetting circuit breaker is disconnected, thereby cutting off the power supply of the heating film, and the heating film stops heating; when the temperature is lower than the third threshold value, the self-resetting circuit breaker is connected, thereby supplying power to the heating film, and the heating film starts heating; wherein the heating film and the self-resetting circuit breaker are spaced apart by the air intake probe or the air exhalation probe.

[0021] As an improvement of the above device, the heating cable assembly further comprises a heat shrink tube and sealing glue; the heat shrink tube is used to reinforce the welded connection position after heating, and the sealing glue is applied to the temperature sensor, for sealing and protecting the wiring part of the temperature sensor.

[0022] As an improvement of the above device, the device further comprises a fixing plate, for fixing the temperature sensor and the self-resetting circuit breaker to the inside of the probe seat.

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

[0024] As an improvement of the above device, the air intake probe and the air exhalation probe are respectively provided with a sampling joint, 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 joint, the low-pressure sampling port and the high-pressure sampling port; the probe seat is further provided with a guide groove, which is in the same direction as the air intake probe or the air exhalation probe when entering the probe seat, for providing guidance.

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

[0026] Compared with the prior art, the present application has the advantages that the heating device for a breath gas probe and the anesthesia machine provided by the present application directly apply the heating function to the air exhalation probe and the air intake probe, instead of the traditional overall heating of the anesthesia breath circuit, thereby significantly improving the universality of the heating structure, ensuring that the air exhalation probe and the air intake probe work in a predetermined temperature range, avoiding water vapor condensation, and improving the monitoring and control of the tidal volume of the air intake probe and / or the air exhalation probe. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 FIG. 1 is a perspective view of a heating device for a breath gas probe according to Embodiment 1 of the present application;

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

[0029] Figure 3 A connection diagram of a heating cable assembly. DETAILED DESCRIPTION

[0030] The technical solutions provided by the present application are further illustrated below in combination with embodiments.

[0031] Embodiment 1

[0032] The heating device for a respiratory gas probe provided by the present embodiment, as shown in Figure 1 and Figure 2 , comprises: an expiratory probe seat 20101, an inspiratory probe seat 20102, an expiratory probe 20103, an inspiratory 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 head 201010, a heating film 5, a self-recovery circuit breaker 6, a temperature sensor 9 and a 10P female head 10. The inspiratory probe seat 20102 is placed above the heating film 5 and the heating lining plate 20105, and then the expiratory probe seat 20101, the inspiratory probe seat 20102 and the heating film 5 are fixed above the heating lining plate 20105 by means of the fastening screw 20106 below the heating lining plate 20105.

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

[0034] As shown in Figure 2 , the expiratory probe 20103 and the inspiratory probe 20104 are respectively provided with the sampling connector 20109, a low-pressure sampling port 20103a and a high-pressure sampling port 20103b, and are respectively installed with an ultrathin elastic diaphragm 20103c.

[0035] The ultrathin elastic diaphragm 20103c is clamped in the expiratory probe 20103 and the inspiratory probe 20104, respectively. Figure 2The ultra-thin elastic diaphragm 20103c of the exhalation probe 20103 is shown. The temperature control of the exhalation probe 20103 will be described below as an example, and the temperature control of the inhalation probe 20104 can be performed in the same way. When the temperature inside the exhalation probe seat 20101 collected by the temperature sensor 9 is lower than 40℃, the heating film 5 starts to work, and when the temperature inside the exhalation probe seat 20101 collected by the temperature sensor 9 is higher than 40℃, the heating film 5 stops working, so that the exhalation probe 20103 works in the temperature range of 30-40℃, thereby preventing water vapor from condensing on the ultra-thin elastic diaphragm 20103a, and the temperature of the exhalation probe 20103 does not exceed 41℃. In this embodiment, two temperature sensors 9 are provided, and when the temperature collected by any one of the temperature sensors 9 is higher than the first threshold value 40℃ or lower than the second threshold value 36℃, the starting and stopping of the heating film 5 can be controlled, thereby increasing the reliability of temperature control, and when one of the temperature sensors 9 is damaged, the other temperature sensor 9 can still detect the temperature, thereby increasing the safety of temperature control. To further increase the safety of temperature control, a self-resetting circuit breaker 6 is further arranged between the heating film 5 and the power supply, and the self-resetting circuit breaker 6 is also arranged in the exhalation probe seat 20101. The melting temperature of the self-resetting circuit breaker 6 is 41℃, and when the temperature inside the exhalation probe seat 20101 reaches 41℃, the self-resetting circuit breaker 6 is disconnected, thereby disconnecting the electrical connection between the heating film 5 and the power supply, and preventing the temperature inside the exhalation probe seat 20101 from being too high due to the continuous working of the heating film 5. As shown in Figure 1 , when installed, one self-resetting circuit breaker 6 and two temperature sensors 9 are respectively inserted into the corresponding installation holes above the exhalation probe seat 20101, then the self-resetting circuit breaker 6 and the two temperature sensors 9 are covered with a fixing plate 20107 to reduce the heat exchange between the inside of the exhalation probe seat 20101 and the outside, and then fastened with fastening screws 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, and the low-pressure sampling port 20103a and the high-pressure sampling port 20103b in the exhalation probe 20103 are connected to the corresponding sampling openings of the exhalation probe seat 20101 through the guide action of the guide groove. The inhalation probe seat 20102 can also be provided with a guide groove and a sampling opening.

[0037] As shown in Figure 3 , 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 protection tubes 7, sealing glue 8, a plurality of 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 with the 10P female head 10 through the heating cable assembly 20108. Specifically, a stainless steel protection tube 7 is sleeved on the first cable 1, the second cable 2 and the third cable 3, the first ends of the first cable 1, the second cable 2 and the third cable 3 are welded with a temperature sensor 9 after being provided with a first heat shrink tube 11, the second ends of the first cable 1, the second cable 2 and the third cable 3 are welded with the 10P female head 10 after being provided with a first heat shrink tube 11, then a proper amount of sealant 8 is applied to the tail of the temperature sensor 9, the first heat shrink tube 11 of the first end of the first cable 1, the second cable 2 and the third cable 3 is heated for fixation, and the first heat shrink tube 11 of the second end of the first cable 1, the second cable 2 and the third cable 3 is heated to fix the second ends of the first cable 1, the second cable 2 and the third cable 2 at the tail end of the 10P female head 10. Figure 3 Two temperature sensors 9 are shown in the middle, and the other temperature sensor 9 is connected in the same way.

[0039] The heating film 5 is connected with the 10P female head 10 through the heating cable assembly 20108, and a self-resetting circuit breaker 6 is further arranged between the heating film 5 and the 10P female head 10. Specifically, the heating film 5 is provided with two power supply lines, i.e. a first power supply line and a second power supply line, which are welded in the following manner: a second heat shrink tube 12 is installed at the first end of a second cable 2, and a 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 with the first power supply line of the heating film 5, the second heat shrink tube 12 is heated to fix the welding position. The second end of the second cable 2 is welded with the pin of the 10P female head 10, the first heat shrink tube 11 is heated to fix the welding position.

[0040] The second power supply line of the heating film 5 is welded with the first end of another second cable 2, and the welding position is fixed by heating with a first heat shrink tube 11. The second end of the second cable 2 is welded with the first pin of the self-resetting circuit breaker 6, and the welding position is fixed by heating with a first heat shrink tube 11. The second pin of the self-resetting circuit breaker 6 is welded with the first end of a fourth cable 4, and the welding position is fixed by heating with a first heat shrink tube 11. The second end of the fourth cable 4 is welded with the pin of the 10P female head 10, and the welding position is fixed by heating with a first heat shrink tube 11.

[0041] In the embodiment, the heating film 5 and the temperature sensor 9 are spaced apart from the inhalation probe 20104 or the exhalation probe 20103, and the heating film 5 and the self-resetting circuit breaker 6 are also spaced apart from the inhalation probe 20104 or the exhalation probe 20103, so that the positions of the heating film 5, the temperature sensor 9 and the self-resetting circuit breaker 6 are spaced apart, that is, the heating film 5 needs to heat the inhalation probe 20104 or the exhalation probe 20103 first, and then the temperature sensor 9 can collect the threshold temperature. The exhalation probe 20103 is taken as an example for description in the embodiment: in the embodiment, the heating film 5 is below the exhalation probe 20103; the temperature sensor 9 and the self-resetting circuit breaker 6 are above the exhalation probe 20103; in other embodiments, the temperature sensor 9 and the self-resetting circuit breaker 6 can also be placed on the upper end of the inhalation probe 20104, and the heating film 5 is placed on 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 below the inhalation probe 20104 or the exhalation probe 20103.

[0042] Installation method:

[0043] First, the exhalation probe base 20101 and the inhalation probe base 20102 are respectively placed above the heating film 5 and the heating lining plate 20105, and then the exhalation probe base 20101, the inhalation probe base 20102 and the heating film 5 are fixed above the heating lining plate 20105 by using the fastening screws 20106 below the heating lining plate 20105; then the self-resetting circuit breaker 6 and the two temperature sensors 9 are respectively inserted into the mounting holes above the exhalation probe base 20101, and then the self-resetting circuit breaker 6 and the two digital temperature sensors 9 are covered by the fixing plate 20107, and then fixed by using the fastening screws 20106; then the exhalation probe 20103 and the inhalation probe 20104 are respectively inserted into the exhalation probe base 20101 and the inhalation probe base 20102; the 10P female head 10 is installed on the anesthesia machine for the power supply and signal acquisition of the heating device and the related cables (not shown in the figure). When the anesthesia breathing circuit with the inhalation and exhalation probe heating device is correctly installed, the 10P male head 201010 related circuit is installed on the anesthesia machine, the 10P female head 10 is plugged into the 10P male head 201010 to supply power, and the heating device works. At this time, since there is no water vapor condensation, the gas sampling accuracy of the low-pressure sampling port 20103a and the high-pressure sampling port 20103b will not be affected, and the sampling accuracy of the existing sampling scheme can be greatly improved and unnecessary power consumption can be reduced.

[0044] Embodiment 2

[0045] The embodiment provides an anesthesia machine comprising the heating device for a breathing gas probe provided in the embodiment 1.

[0046] In the prior art, CN116249234A usually adopts a heating rod to insert into the whole anesthetic breathing circuit to heat, and this structure is not suitable for plastic circuits because the anesthetic breathing circuit is designed of aluminum alloy, and the universality is low.The present application directly adopts the heating form of the inhalation and exhalation probe, improves the temperature control precision, and the consumption of the heating power of the whole anesthetic breathing circuit is far greater than that of the heating of the inhalation and exhalation probe alone, and the resource consumption is reduced.Meanwhile, the universality of the heating structure is greatly increased.The device structure of the present application is original, and the improved design significantly improves the practicability and safety of the heating device, and makes it more suitable for the strict requirements of the medical environment.

[0047] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the examples, those skilled in the art should understand that modifications or equivalent replacements of the technical solutions of the present application do not deviate from the spirit and scope of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A heating device for a respiratory gas probe, the respiratory gas probe comprising: An inspiratory probe and an expiratory probe; The heating device comprises: A probe seat for accommodating the inspiratory probe and / or the expiratory probe; A heating film close to the probe seat; A heating lining plate for fixing the probe seat and the heating film together; When the internal temperature of the probe seat is equal to or higher than a first threshold value, the heating film stops heating; when the internal temperature is equal to or lower than a second threshold value, the heating film starts heating, so as to ensure that the inspiratory probe and / or the expiratory probe in the probe seat work within a predetermined temperature range, avoid water vapor condensation, and thus improve the monitoring and control of the inspiratory probe and / or the expiratory probe tidal volume; The heating device further comprises at least one temperature sensor for monitoring the internal temperature of the probe seat; when the internal temperature monitored by any one of the temperature sensors is higher than the first threshold value, the heating film stops heating; when the internal temperature monitored by any one of the temperature sensors is lower than the second threshold value, the heating film starts heating; wherein the heating film and the temperature sensor are spaced apart by the inspiratory probe or the expiratory probe. The heating device further comprises a heating cable assembly and a connector for providing electrical connection and communication connection between the heating film and the body of the anesthesia machine, and for providing electrical connection and communication connection between the temperature sensor and the body of the anesthesia machine. The heating cable assembly comprises a first cable, a second cable, a third cable, and a stainless steel protection tube, wherein The first ends of the first cable, the second cable, and the third cable are sleeved with the stainless steel protection 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 connector; The heating cable assembly further comprises two second cables, a fourth cable, and a self-resetting circuit breaker; the heating film is provided with a first power line and a second power line; wherein The first end of the first second cable is welded to the first power line of the heating film, and the second end is welded to a 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 a first pin of the self-resetting circuit breaker; a second pin of the self-resetting circuit breaker is welded to the first end of the fourth cable, and the second end of the fourth cable is welded to a pin of the connector; the self-resetting circuit breaker is located in the probe seat; when the temperature is equal to or higher than a third threshold value, the self-resetting circuit breaker is disconnected, thereby disconnecting the power supply of the heating film and stopping the heating of the heating film; when the temperature is lower than the third threshold value, the self-resetting circuit breaker is connected, thereby supplying power to the heating film and starting the heating of the heating film; wherein the heating film and the self-resetting circuit breaker are spaced apart by the inspiratory probe or the expiratory 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, for clamping the heating film between the heating lining plate and the probe seat.

3. The heating device for a respiratory gas probe of claim 1, wherein, The heating cable assembly further comprises a heat shrink tube and sealant; the heat shrink tube is used to reinforce the welded connection position after heating, and the sealant is applied to the temperature sensor, for sealing and protecting the wiring part of the temperature sensor.

4. The heating device for a respiratory gas probe according to claim 1, characterized in that Further comprising: A fixing plate is arranged to fix the temperature sensor and the self-restoring circuit breaker to the inside of the probe seat.

5. The heating device for a respiratory gas probe of claim 1, wherein, The inhalation probe and the exhalation probe are respectively arranged in different probe seats.

6. The heating device for a respiratory gas probe of claim 1, wherein, The inhalation probe and the exhalation probe are respectively provided with a sampling joint, 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 joint, the low-pressure sampling port and the high-pressure sampling port; the probe seat is further provided with a guide groove, which is in the same direction as the inhalation probe or the exhalation probe when entering the probe seat, for providing guidance.

7. An anaesthesia machine characterised in that, A heating device for a respiratory gas probe comprising any one of claims 1-6.

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