Noise reduction exhalation valve assembly and anesthesia machine

Abstract

The utility model relates to the technical field of medical instruments, in particular to a noise reduction exhalation valve assembly and an anaesthesia machine, the noise reduction exhalation valve assembly comprises an exhalation valve core, a flap valve core and a flap piece, an exhalation valve airway is arranged on the exhalation valve core, and the flap piece moves along with the flap valve core; when the valve piece is attached to the exhalation valve airway, the exhalation valve airway is closed, and when the valve piece leaves the exhalation valve airway, the exhalation valve airway is opened. The flap valve element is provided with a flange in the circumferential direction, the flap piece is completely attached to the bottom face of the flange, and the flange drives the flap piece to move along with the flap valve element, so that vibration of the flap piece is avoided, and noise is reduced. The interior of the exhalation valve airway is divided into a plurality of flow channels used for flow division, the impact of airflow on the noise reduction exhalation valve assembly is reduced, and therefore noise is reduced.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a noise-reducing exhalation valve assembly and an anesthesia machine. Background Technology

[0002] An anesthesia breathing circuit is a loop that connects the gas outlet of the anesthesia machine to the patient's airway.

[0003] The commonly used ventilation modes in anesthesia breathing circuits are inspiratory and expiratory. Usually, there is a certain airway pressure at the end of expiration, which is called PEEP (positive end-expiratory pressure). At this time, the user's airway pressure usually needs to be maintained at the critical state of positive end-expiratory pressure. During this period, the expiratory valve plays a crucial role. Its core function is to control the switching between inspiratory and expiratory breathing in the anesthesia machine and maintain it at a certain pressure value. It is an adjustable on / off valve.

[0004] The exhalation valve operates based on a simple pneumatic principle: it is equipped with an air inlet, a control inlet, and an outlet. The valve core assembly operates under the pressure of the gas at the control inlet, closing the outlet. Once the pressure at the air inlet exceeds the pressure set by the user at the control inlet, the gas will push open the valve core assembly and be released through the outlet, thereby regulating and stabilizing the gas pressure.

[0005] However, exhalation valves also face technical challenges in actual operation. When the user sets the PEEP to above 30 cmH2O (typically 70 cmH2O) between inhalation and exhalation, the airway pressure continuously rises due to the continuous supply of fresh air. The exhalation valve needs to maintain pressure balance through repeated opening and closing. At this time, due to the high pressure, the exhaled air is expelled quickly, causing the flexible diaphragm in the valve assembly to vibrate with the exhaled air, resulting in vibration of surrounding air molecules and generating significant noise, affecting user experience.

[0006] Therefore, the noise problem under high pressure needs to be solved in order to improve the overall performance of anesthesia machines and the user experience. Utility Model Content

[0007] The purpose of this invention is to overcome the above-mentioned defects of the prior art and thus provide a noise-reducing exhalation valve assembly and an anesthesia machine.

[0008] To solve the above-mentioned technical problems, the noise-reducing exhalation valve assembly provided by this utility model includes: an exhalation valve core, a valve core, and a valve plate, wherein the exhalation valve core is provided with an exhalation valve airway, and the valve plate moves with the valve core; when the valve plate is in contact with the exhalation valve airway, the exhalation valve airway is closed, and when the valve plate leaves the exhalation valve airway, the exhalation valve airway is opened;

[0009] The valve core is provided with a flange along the circumference, and the valve disc is completely in contact with the bottom surface of the flange. The flange drives the valve disc to move with the valve core, thereby avoiding valve disc vibration and reducing noise.

[0010] The exhalation valve's airway is divided into several flow channels for diversion, reducing the impact of airflow on the noise-reducing exhalation valve assembly and thus reducing noise.

[0011] As an improvement to the above-mentioned component, the valve completely covers the bottom, side and top surfaces of the flange and fits against the flange.

[0012] As an improvement to the above-mentioned component, the outer diameter of the flange is larger than the inner diameter of the exhalation valve passage of the exhalation valve core.

[0013] As an improvement to the above-mentioned components, the exhalation valve core has several guide plates inside the exhalation valve airway to divide the exhalation valve airway into several flow channels.

[0014] As an improvement to the above-mentioned components, the guide plate includes annular guide plates, and a plurality of annular guide plates are nested sequentially from the center of the exhalation valve airway to the inner wall, forming an annular flow channel between two adjacent annular guide plates.

[0015] As an improvement to the above-mentioned components, a straight baffle is also provided in the exhalation valve passage of the exhalation valve core. The straight baffle extends from the innermost annular guide plate to the inner wall of the exhalation valve passage to divide the annular flow channel into several sub-flow channels.

[0016] As an improvement to the above-mentioned components, the plurality of guide plates are disposed near the air outlet of the exhalation valve airway.

[0017] To achieve another objective of this utility model, this utility model also provides an anesthesia machine, including the aforementioned noise-reducing expiratory valve assembly.

[0018] Compared to existing technologies, the advantages of this utility model are that it provides a noise-reducing exhalation valve assembly and an anesthesia machine.

[0019] The structure in which the valve plate 2054 is wrapped by the valve diaphragm plate 2052 can prevent vibration at higher PEEP settings, thus overcoming the shortcomings of existing designs. Furthermore, the airflow guiding structure of the exhalation valve core 2055 can guide the airflow near the outlet of the exhalation valve passage 205c1 of the exhalation valve core 2055, thereby reducing the impact of airflow on the valve core assembly and reducing noise generation. Attached Figure Description

[0020] Figure 1 An overall cross-sectional view of an exhalation valve assembly provided for the prior art;

[0021] Figure 2 A schematic diagram of the connection structure of the valve core 2053 and valve disc 2054 of the exhalation valve assembly provided in the prior art;

[0022] Figure 3 A schematic diagram of the connection structure of the valve core 2053 and valve plate 2054 of the noise reduction exhalation valve assembly provided in Embodiment 1 of this utility model;

[0023] Figure 4 The flow channel of the exhalation valve airway 205c1 of the exhalation valve core 2055 of the noise reduction exhalation valve assembly provided in Embodiment 1 of this utility model;

[0024] Figure 5 This is an overall cross-sectional view of the noise-reducing exhalation valve assembly provided in Embodiment 1 of this utility model. Detailed Implementation

[0025] The technical solution provided by this utility model is further illustrated below with reference to the embodiments.

[0026] like Figure 1 As shown, the prior art provides an exhalation valve assembly including: an exhalation valve cover 2051, an air control interface 2051a, an exhaust gas inlet 2051b, a valve diaphragm 2052, a valve core 2053, a valve disc 2054, an exhalation valve core 2055, an exhalation valve base 2056, a sealing ring 2057, a driving gas inlet 205a, a driving gas outlet 205b, an exhalation valve air passage 205c1, and a gas discharge passage 205c2.

[0027] like Figure 1 As shown, in inspiratory mode, control gas is input through control gas interface 2051a, providing control gas pressure P1. This pressure is applied to valve core 2053 via valve diaphragm 2052, causing valve diaphragm 2054 to seal against expiratory valve core 2055. At this time, valve diaphragm 2054 and expiratory valve core 2055 are in contact, and the expiratory valve assembly is in the closed state. Drive gas is input into the anesthesia breathing circuit through drive gas inlet 205a and drive gas outlet 205b. In expiratory mode, after setting PEEP (Positive End-Expiratory Pressure), there are two main stages. In the first stage, when the airway pressure P2 is much greater than the control gas pressure P1, the valve core 2053 is pushed upward, the valve disc 2054 separates from the expiratory valve core 2055, the expiratory valve opens, and the airway pressure P2 drops rapidly to near the control gas pressure P1. In the second stage, when the airway pressure P2 is close to the control gas pressure P1, the valve disc 2054 begins to fit with the expiratory valve core 2055, and the expiratory valve is in a critically closed state near the control gas pressure P1.

[0028] Figure 2The connection structure of the valve core 2053 and valve disc 2054 in the prior art is shown. In the prior art, the valve core 2053 has a circumferential groove, and the inner ring of the annular valve disc 2054 is embedded in the groove and fixed, while the outer ring is in a free state. In exhalation mode, the airflow direction D is as follows: Figure 2 As shown, the driving gas flows through the exhalation valve passage 205c1 of the exhalation valve core 2055 and rushes towards the valve plate 2054. The outer ring of the valve plate 2054 vibrates due to the airflow disturbance, generating noise. In this mode, the airflow also impacts the gas inside the cavity and the valve core assembly, causing noise. In the inspiratory diaphragm mode, the inner ring of the valve plate 2054 and a portion of the outer ring near the inner ring are in contact with the outlet of the exhalation valve passage 205c1 of the exhalation valve core 2055, sealing the outlet of the exhalation valve passage 205c1. A portion of the outer ring of the valve plate 2054 remains in a free state, and the vibration of the exhalation valve core 2055 is transmitted to the valve plate 2054, causing that portion of the outer ring to vibrate and generate noise.

[0029] Example 1

[0030] To address the aforementioned issues, this embodiment provides a noise-reducing exhalation valve assembly, which improves the connection structure between the valve core 2053 and the valve plate 2054, as well as the exhalation valve airway 205c1 of the exhalation valve core 2055.

[0031] Figure 3 The connection structure of the valve core 2053 and valve plate 2054 in the noise-reducing exhalation valve assembly provided in this embodiment is shown. The valve core 2053 has a circumferentially circumferentially provided flange 2053a; the outer diameter of the flange 2053a is larger than the inner diameter of the air outlet of the exhalation valve passage 205c1 of the exhalation valve core 2055; the valve plate 2054 is completely in contact with the bottom surface of the flange 2053a; the flange 2053a drives the valve plate 2054 to move with the valve core 2053. Figure 3 As shown, to increase the stability of the valve plate 2054, preferably, the valve plate 2054 can completely cover the flange 2053a, that is, cover the bottom, side and top surfaces of the flange 2053a and fit snugly against the flange 2053a. After the valve plate 2054 is completely fitted against the flange 2053a, there are no free parts, which can avoid vibration caused by airflow and conduction. Therefore, the structure of the valve diaphragm 2052 covering the valve plate 2054 provided in this embodiment, compared with the open structure of the diaphragm edge in the prior art, can avoid vibration at a higher PEEP setting value, making up for the shortcomings of the prior art.

[0032] To further reduce noise, this embodiment also improves the exhalation valve airway 205c1 of the exhalation valve core 2055. In this embodiment, the exhalation valve airway 205c1 of the exhalation valve core 2055 is divided into several flow channels. Figure 4The flow path of the exhalation valve passage 205c1 of the exhalation valve core 2055 is shown. In this embodiment, several guide plates 2055a are provided within the exhalation valve passage 205c1 of the exhalation valve core 2055, thereby dividing the exhalation valve passage 205c1 into several flow paths. Figure 4 As shown, the guide plate 2055a may include annular guide plates 2055a, with several annular guide plates 2055a nested sequentially from the center of the exhalation valve airway 205c1 to the inner wall of the exhalation valve airway 205c1. The innermost annular guide plate 2055a forms a circular flow channel A1; annular flow channels A2 are formed between two adjacent annular guide plates 2055a, thereby dividing the exhalation valve airway 205c1 into several flow channels. A straight baffle 2055b is also provided inside the exhalation valve airway 205c1 of the exhalation valve core 2055. This straight baffle 2055b extends from the innermost annular guide plate 2055a to the inner wall of the exhalation valve airway 205c1, and is used to further divide the annular flow channel A2. Several guide plates 2055a may also be disposed only near the outlet of the exhalation valve airway 205c1 of the exhalation valve core 2055. The flow guiding structure of the exhalation valve core 2055 provided in this embodiment, compared with the existing flow guiding structure design without an exhalation valve assembly, can guide the gas flow near the outlet and reduce the impact of airflow on the valve core assembly.

[0033] Figure 5 A schematic diagram of the overall structure of the noise-reducing exhalation valve assembly provided in this embodiment is shown.

[0034] The noise-reducing exhalation valve assembly provided in this embodiment features a structure that guides the gas flow near the outlet of the exhalation valve airway 205c1. This allows for smoother exhaled gas flow, reducing turbulence and noise, and also reduces the impact of airflow on the valve core assembly, thereby reducing air vibration. Furthermore, a flexible valve plate 2054 completely encloses the flange 2053a of the valve core, preventing vibration of molecules near the outlet caused by the vibration of the valve plate 2054, thus eliminating noise. Moreover, when the valve plate 2054 is in contact with the exhalation valve core 2055, the complete enclosed nature of the valve plate 2054 prevents vibration from propagating, thus eliminating noise. Figure 2 The vibrations caused by the edge of the valve plate 2054 to the nearby air in the prior art shown further reduce or even eliminate noise.

[0035] Experiments have shown that the noise-reducing exhalation valve assembly provided in this embodiment can eliminate noise when the PEEP value is 30, 40, or 50 cmH2O.

[0036] Installation method:

[0037] like Figure 5As shown, during assembly, first assemble the valve diaphragm 2052 and valve piece 2054 with the valve core 2053 respectively, then install the sealing ring 2057 into the sealing ring groove of the valve core 2053, then install the assembled valve core 2053 into the exhalation valve cover 2051, then install the sealing ring 2057 into the exhalation valve base 2056, then insert the exhalation valve base 2056 into the exhalation valve cover 2051, and finally tighten it with a fastening screw (not shown).

[0038] Example 2

[0039] This embodiment provides an anesthesia machine, including the one provided in Embodiment 1.

[0040] 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 noise reducing exhalation valve assembly, comprising: An exhalation valve core, a valve stem, and a valve disc, wherein the exhalation valve core has an exhalation valve passage, and the valve disc moves with the valve core; when the valve disc is in contact with the exhalation valve passage, the exhalation valve passage is closed; when the valve disc leaves the exhalation valve passage, the exhalation valve passage is opened; characterized in that... The valve core is provided with a flange along the circumference, and the valve disc is completely in contact with the bottom surface of the flange. The flange drives the valve disc to move with the valve core, thereby avoiding valve disc vibration and reducing noise. The exhalation valve's airway is divided into several flow channels for diversion, reducing the impact of airflow on the noise-reducing exhalation valve assembly and thus reducing noise.

2. The noise reducing exhalation valve assembly of claim 1, wherein, The valve completely covers the bottom, side, and top surfaces of the flange and fits snugly against the flange.

3. The noise reducing exhalation valve assembly of claim 1, wherein, The outer diameter of the flange is larger than the inner diameter of the exhalation valve passage of the exhalation valve core.

4. The noise-reducing exhalation valve assembly according to any one of claims 1 to 3, characterized in that, The exhalation valve core has several guide plates installed inside the exhalation valve airway to divide the exhalation valve airway into several flow channels.

5. The noise reducing exhalation valve assembly of claim 4, wherein, The guide plate includes annular guide plates, and several annular guide plates are nested sequentially from the center of the exhalation valve airway to the inner wall, forming an annular flow channel between two adjacent annular guide plates.

6. The noise reducing exhalation valve assembly of claim 5, wherein, The exhalation valve core also has a straight baffle inside the exhalation valve passage. The straight baffle extends from the innermost annular guide plate to the inner wall of the exhalation valve passage to divide the annular flow channel into several sub-flow channels.

7. The noise reducing exhalation valve assembly of claim 5 or 6, wherein, The several guide plates are disposed near the air outlet of the exhalation valve airway.

8. An anaesthesia machine characterised in that, Includes the noise-reducing exhalation valve assembly as described in any one of claims 1 to 7.

Images