Molded breathing circuit heating device and anesthesia respirator
By using a combination of heating elements, temperature sensors, and self-resetting circuit breakers in the breathing circuit of anesthesia machines, the problems of high power consumption and high local temperature in existing technologies are solved, achieving low power consumption, safe and efficient heating.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEYER MEDICAL CO LTD
- Filing Date
- 2025-08-04
- Publication Date
- 2026-07-31
AI Technical Summary
Existing heating devices for the breathing circuit of anesthesia machines suffer from problems such as high power consumption, high local temperature, high cost, and insufficient safety, especially the poor heating effect at the front end of the circuit.
The heating element directly heats the inhalation and exhalation ports of the circuit. A temperature sensor and a self-resetting circuit breaker are installed near the heating element to monitor the heating effect in real time. Power is cut off when the temperature exceeds the limit. Combined with a low-power heating design, safety is ensured.
It achieves uniform heating of the air inlet and outlet of the circuit, reduces heat conduction loss, enables effective heating with low power, avoids excessive local temperature, improves safety and equipment lifespan, and reduces costs.
Smart Images
Figure CN224573058U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of anesthesia and respiratory equipment technology, specifically a modular breathing circuit heating device and anesthesia ventilator. Background Technology
[0002] The anesthesia machine's breathing circuit is connected to the patient via a bellows. The patient's exhaled air contains a lot of water vapor, and the breathing circuit is at room temperature. When the high-temperature water vapor encounters the circuit, it will quickly condense into water droplets and adhere to the inside of the breathing circuit. When a lot of condensate accumulates, it will affect ventilation and the accuracy of pressure and flow sampling. Therefore, it is necessary to heat the circuit through a heating device. The circuit heating has two functions: first, to prevent the formation of condensate, and second, to heat the gas delivered to the patient to avoid the patient inhaling cold air and causing tracheal spasm.
[0003] Currently, most anesthesia machine breathing circuits use heating rods to heat the circuit. These heating rods are typically installed between the circuit and the machine frame, transferring heat to other parts of the circuit through structural components. The part of the circuit most in need of heating is the front end, closest to the patient's inspiratory and expiratory ports. This area is closest to the patient and densely populated with various pressure and flow sensor sampling ports for real-time monitoring of airway pressure and tidal volume. However, the current heating rod arrangement requires significant power to effectively heat the inspiratory and expiratory ports, resulting in high power consumption and localized high temperatures. Furthermore, the heat gradually decreases during heat conduction, and the breathing ports are furthest from the heating rods. To prevent heat loss, high-power heating rods are generally used. This high power consumption means that even when the inspiratory and expiratory ports are at a suitable temperature, the surrounding area of the heating rod becomes excessively hot, requiring additional protective devices to prevent burns. High temperatures also easily cause premature aging of surrounding components, leading to higher costs. Utility Model Content
[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and propose a modular breathing circuit heating device and an anesthesia ventilator. This heating device uses heating elements to directly heat the inhalation and exhalation ports of the circuit. Temperature sensors and self-resetting circuit breakers are placed near the heating elements to monitor the heating effect in real time. Power is cut off when the temperature exceeds the limit, resulting in a more direct and effective heating effect with high functional safety.
[0005] To achieve the above objectives, the present invention adopts the following technical solution:
[0006] A modular breathing circuit heating device, the heating device comprising a heating element, a temperature sensor, a self-resetting circuit breaker, and a contact connector;
[0007] The heating element is attached to the inhalation probe seat and the exhalation probe seat;
[0008] The temperature sensor is installed in the mounting hole on the upper part of the exhalation probe base;
[0009] A self-resetting circuit breaker is installed at the bottom of the intake probe holder;
[0010] The temperature sensor is electrically connected to the contact connector;
[0011] The current input terminal and current output terminal of the heating element are both connected to a contact connector, and a self-resetting circuit breaker is connected in series in the heating circuit of the heating element.
[0012] The contact connector is used to connect to the main circuit of the anesthesia machine.
[0013] Furthermore, the heating device also includes a heating element pressure plate, which presses down on the heating element so that the heating element is in close contact with the inhalation probe seat and the exhalation probe seat.
[0014] Preferably, the heating element includes two heating sub-element, one heating sub-element is attached to the inspiratory probe seat, and the other heating sub-element is attached to the expiratory probe seat.
[0015] Preferably, there are two temperature sensors connected in parallel to the contact connector.
[0016] Preferably, the inspiratory probe holder and the expiratory probe holder are mounted on the circuit base plate.
[0017] This utility model also provides an anesthesia ventilator, which adopts the above-mentioned modular breathing circuit heating device.
[0018] Compared with the prior art, the significant advantages of this utility model are as follows:
[0019] 1. This utility model fixes the heating element at the breathing port of the circuit, and the heat is directly transferred to the inlet and outlet positions of the circuit and the patient's ventilation; the circuit inlet and outlet are directly heated, the heating temperature is uniform, the heat loss during the heat conduction process is small, the heating effect can be achieved with low power, and it will not cause the local temperature to be too high.
[0020] 2. This utility model sets two temperature sensors on the base near the heating element to monitor the temperature, which can prevent the heating from failing due to temperature sensor failure; and places a self-resetting circuit breaker on the base away from the heating element to prevent the temperature from getting too high. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the heating device of this utility model;
[0022] Figure label:
[0023] 1. Heating element; 2. Temperature sensor; 3. Self-resetting circuit breaker; 4. Contact connector; 5. Inhalation probe holder; 6. Exhalation probe holder; 7. Heating element pressure plate; 8. Circuit base plate. Detailed Implementation
[0024] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.
[0025] Example 1
[0026] like Figure 1 As shown, a modular breathing circuit heating device includes a heating element 1, a temperature sensor 2, a self-resetting circuit breaker 3, and a contact connector 4.
[0027] The heating element 1 is attached to the inhalation probe seat 5 and the exhalation probe seat 6;
[0028] The temperature sensor 2 is installed in the mounting hole on the upper part of the exhalation probe seat 6;
[0029] A self-resetting circuit breaker 3 is installed at the bottom of the intake probe seat 5;
[0030] The temperature sensor 2 is electrically connected to the contact connector 4;
[0031] The current input terminal and current output terminal of the heating element 1 are both connected to the contact connector 4, and the self-resetting circuit breaker 3 is connected in series in the heating circuit of the heating element 1.
[0032] The contact connector 4 is used to connect the main circuit of the anesthesia machine (the main circuit of the anesthesia machine is not shown in the figure).
[0033] The heating device also includes a heating element pressure plate 7, which presses down on the heating element 1, so that the heating element 1 is in close contact with the inhalation probe seat 5 and the exhalation probe seat 6.
[0034] In this embodiment, the heating element 1 is a single unit. As those skilled in the art will know, the heating element includes two heating sub-pieces, one of which is attached to the inspiratory probe seat and the other of which is attached to the expiratory probe seat.
[0035] There are two temperature sensors 2, which are connected in parallel to the contact connector 4.
[0036] The inhalation probe seat 5 and the exhalation probe seat 6 are mounted on the circuit base plate 8.
[0037] The specific installation of the heating device of this utility model is as follows:
[0038] The heating element is installed on the upper part of the inspiratory and expiratory probe holders. A heating element pressure plate presses down on the heating element and is secured with screws, ensuring a tight fit between the heating element and the inspiratory and expiratory probe holders for better heating of these components. Two temperature sensors are installed in two holes on the upper part of the expiratory probe holder to monitor the heating temperature in real time and adjust the power supply current to the heating element to control the temperature. To ensure functional safety and prevent continuous heating in case of temperature sensor failure, a self-resetting circuit breaker is installed at the bottom of the inspiratory probe holder, away from the heating element. The self-resetting circuit breaker is connected in series with the heating element's circuit. In this circuit, when the temperature of the intake probe seat exceeds a certain level, the self-resetting circuit breaker will disconnect the power supply, and the heating element will stop heating to prevent the circuit from overheating and causing burns. The self-resetting circuit breaker is placed far from the heating element because temperature regulation is normally achieved by a temperature sensor. The self-resetting circuit breaker serves as a last resort safety measure, and therefore, it is placed far from the heating element to prevent the circuit breaker from tripping due to excessive temperature before the temperature sensor can function. The heating element, temperature sensor, and self-resetting circuit breaker are connected to the contact connector via wiring (connection wiring is as follows). Figure 1 (As shown by the red line in the middle), and then connected to the main circuit of the anesthesia machine to achieve power supply and signal transmission.
[0039] The heating device of this utility model can also be installed without a heating element pressure plate, and the heating element can be installed on the inhalation probe seat and the exhalation probe seat by means of adhesive backing or other methods.
[0040] The heating element, temperature sensor, and self-resetting circuit breaker (also known as an automatic thermal reset circuit breaker) of this utility model can be sensors of various specifications, models, and sizes. The quantity can be increased or decreased according to requirements, and they can be obtained through commercial purchase.
[0041] Example 2
[0042] This utility model also provides an anesthesia ventilator, which adopts the modular breathing circuit heating device described in Example 1.
[0043] For any content not described in detail in this utility model, conventional technical knowledge in the field can be used.
[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solution of this utility model do not depart from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. A moulded breathing circuit heating device, characterised in that, The heating device includes a heating element, a temperature sensor, a self-resetting circuit breaker, and a contact connector; The heating element is attached to the inhalation probe seat and the exhalation probe seat; The temperature sensor is installed in the mounting hole on the upper part of the exhalation probe base; A self-resetting circuit breaker is installed at the bottom of the intake probe holder; The temperature sensor is electrically connected to the contact connector; The current input terminal and current output terminal of the heating element are both connected to a contact connector, and a self-resetting circuit breaker is connected in series in the heating circuit of the heating element. The contact connector is used to connect to the main circuit of the anesthesia machine.
2. The molded respiratory circuit heating device of claim 1, wherein, The heating device also includes a heating element pressure plate, which presses down on the heating element so that the heating element is in close contact with the inhalation probe seat and the exhalation probe seat.
3. The molded respiratory circuit heating device of claim 1, wherein, The heating element includes two heating sub-element, one of which is attached to the inspiratory probe seat and the other of which is attached to the expiratory probe seat.
4. The molded respiratory circuit heating device of claim 1, wherein, The temperature sensor consists of two sensors connected in parallel to the contact connector.
5. The molded respiratory circuit heating device of claim 1, wherein, The inhalation probe holder and the expiration probe holder are mounted on the circuit base plate.
6. An anaesthesia ventilator characterized by The anesthesia ventilator uses the modular breathing circuit heating device as described in any one of claims 1-5.