Pressure relief valve, respiratory support equipment air circuit and respiratory support equipment

Abstract

The present invention provides a pressure relief valve, a respiratory support device air circuit, and a respiratory support device. The pressure relief valve includes a valve body, the valve body is a hollow structure provided with an air inlet and a pressure relief port, a diaphragm is provided at the lower portion of the valve body, the air inlet and the pressure relief port are communicated through the space above the diaphragm, and a driving device is provided at the lower portion of the diaphragm for driving the diaphragm to move up and down. The pressure relief valve provided by the present invention is provided with both an air inlet and a pressure relief port at the upper portion, and the gas flow rate is controlled by controlling the distance between the diaphragm and the pressure relief port. The pressure relief valve of the present invention is used to connect to a branch of the air circuit of the respiratory support device, and is connected to the main circuit of the air circuit through an air inlet, which can reduce the gas resistance of the air circuit of the respiratory support device, and achieve pressure control by controlling the pressure relief size of the pressure relief valve on the branch. Two or more pressure relief valves are used in combination in the air circuit according to usage needs, thereby expanding the pressure control range and improving the pressure control accuracy.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a pressure relief valve, an air circuit of a respiratory support device, and a respiratory support device. Background Art

[0002] Respiratory support equipment (such as ventilators) is an instrument used to replace or assist human respiratory function. It is suitable for artificial respiration of patients with respiratory failure or even respiratory arrest. It is an important tool for saving the lives of certain critically ill patients. It is widely used in the medical field and is deeply loved by the majority of patients. The ventilators currently on the market use turbines to supply air. The unstable airflow caused by the rotation of the turbine often leads to unstable air supply pressure and flow rate, which brings an uncomfortable experience to patients.

[0003] The breathing control valve is a critical component in a ventilator. Existing breathing control valves are typically configured as three-way pressure-balancing valves. When the ventilator needs to increase pressure, the valve closes its release port. A pressure sensor monitors the air pressure until it reaches the set value, and the valve remains in place. When the ventilator needs to decrease pressure, the valve opens its release port. When the pressure sensor monitors the air pressure until it reaches the set value, the valve remains in place. Regulating the ventilator's airway pressure is achieved through closed-loop control. With a three-way valve, both the inlet and outlet of the valve need to be connected to the airway, increasing gas resistance. Furthermore, with only one valve providing pressure relief, the pressure relief range is limited, resulting in a smaller controllable pressure range.

[0004] Chinese utility model patent CN101856534A discloses a three-way pressure balancing valve and a medical ventilator. The three-way pressure balancing valve includes a three-way integrated pipeline, which includes an air source port, a release port, and a breathing port. The air source port and the breathing port are directly connected. A diaphragm is provided at the inner end of the air source port. The air source port and the release port are connected through the space above the diaphragm. The diaphragm is connected to a driver for driving the diaphragm up and down to adjust the gap between the air source port and the release port. After the medical ventilator is connected to the three-way pressure balancing valve, the gap between the air source port and the release port can be adjusted by the up and down movement of the diaphragm, respectively, to control the pressure of inspiration and expiration, maintain appropriate pressure during the inspiration and expiration phases, and use the three-way pressure balancing valve to achieve two levels of pressure to achieve the optimal pressure. The three-way pressure balancing valve has a simple structure, is easy to use, and has precise control. The air source port and the breathing port of the three-way pressure valve need to be connected to the air circuit, and blocking them will increase the resistance of the gas. Moreover, the pressure is released through a three-way valve, and the controllable pressure range is small. Summary of the Invention

[0005] In order to overcome the problems in the prior art, the present invention provides a pressure relief valve, a respiratory support equipment air circuit and a respiratory support equipment, by arranging an air inlet and an air outlet on the upper part of the pressure relief valve, and arranging multiple air outlets for use in the tributaries of the air circuit of the respiratory support equipment, so as to realize the control of the ventilator air circuit pressure.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] A first aspect of the present invention provides a pressure relief valve, comprising a valve body, wherein the valve body is a hollow structure provided with an air inlet and a pressure relief port, a diaphragm is provided at the lower portion of the valve body, the air inlet and the pressure relief port are communicated through the space above the diaphragm, and a driving device is provided at the lower portion of the diaphragm for driving the diaphragm to move up and down.

[0008] In a preferred embodiment, in the pressure relief valve provided by the present invention, the air inlet is provided in the middle position of the upper part of the valve body, and there are several pressure relief ports, which are respectively provided around the air inlet.

[0009] In a preferred embodiment, in the pressure relief valve provided by the present invention, the driving mechanism is a voice coil motor.

[0010] In a preferred embodiment, in the pressure relief valve provided by the present invention, the voice coil motor includes a shell, a motor shaft is provided in the middle of the shell, a flexible elastic member is provided on the upper part of the motor shaft, a coil bracket is provided on the lower part of the motor shaft, a coil is fixed on the coil bracket, and a permanent magnet is provided on the outside of the coil bracket.

[0011] In a preferred embodiment, in the pressure relief valve provided by the present invention, a guide component is further provided at the lower portion of the motor shaft to ensure that the motor shaft performs linear motion.

[0012] In a preferred embodiment, in the pressure relief valve provided by the present invention, the guide component is a linear bearing, and the linear bearing is fixed to the lower part of the motor shaft through a fixing bracket.

[0013] In a preferred embodiment, in the pressure relief valve provided by the present invention, the flexible elastic member is a flexible spring sheet, and the flexible spring sheet is provided with a plurality of deformation holes, which are arranged in a spiral shape to ensure the deformation degree of the flexible elastic member.

[0014] In a preferred embodiment, in the pressure relief valve provided by the present invention, a motor housing is provided on the upper portion of the voice coil motor, and the voice coil motor is connected to the lower portion of the valve body through the motor housing.

[0015] In a preferred embodiment, in the pressure relief valve provided by the present invention, the motor shaft of the voice coil motor is connected to the diaphragm, and the motor shaft drives the diaphragm to move up and down.

[0016] In a preferred embodiment, in the pressure relief valve provided by the present invention, a plurality of heat dissipation holes are provided at the bottom of the motor housing.

[0017] In a preferred embodiment, in the pressure relief valve provided by the present invention, the motor housing is detachably connected to the valve body.

[0018] A second aspect of the present invention provides a respiratory support equipment air circuit, which includes a flow sensor, a pressure sensor and the above-mentioned pressure relief valve. The pressure relief valve is arranged on a branch of the respiratory support equipment air circuit, and the number of the pressure relief valves is at least two.

[0019] A third aspect of the present invention provides a respiratory support device, which includes the respiratory support device air circuit described above.

[0020] The working principle of the present invention is as follows:

[0021] The turbine blower provides a stable air source with stable pressure and flow. A pressure relief valve in a branch of the respiratory airway controls the size of the pressure relief port. A flow sensor and pressure sensor provide real-time feedback on the pressure and flow. When the patient inhales, the air pressure increases, and the pressure relief valve controls the pressure relief port to decrease until the pressure reaches the set value, at which point the port remains unchanged. When the patient exhales, the air pressure decreases, and the pressure relief valve controls the pressure relief port to increase until the pressure drops to the set value, at which point the port remains unchanged.

[0022] The beneficial effects of the present invention are as follows:

[0023] (1) The present invention provides a pressure relief valve, which has an air inlet and a pressure relief port on its valve body. By controlling the distance between the diaphragm and the pressure relief port, the gas flow rate can be controlled. The pressure relief valve of the present invention is used to connect to a branch of the air circuit of a respiratory support device. It is connected to the main circuit of the air circuit through an air inlet, which can reduce the gas resistance of the air circuit of the respiratory support device. Pressure control is achieved by controlling the pressure relief size of the pressure relief valve on the branch, and feedback adjustment is performed through the pressure sensor and flow sensor of the air circuit.

[0024] (2) The pressure relief valve disclosed in the present invention controls the linear motion of the diaphragm through the voice coil motor, further controls the opening size of the pressure relief port, and realizes the regulation of the air path pressure. The voice coil motor in the present invention is provided with a flexible spring to provide resistance and support for the motor shaft. At the same time, a linear bearing is also provided. The combined action of the flexible spring and the linear bearing ensures that the motor shaft of the voice coil motor moves linearly without generating fluctuations.

[0025] (3) In the voice coil motor disclosed by the present invention, the permanent magnet is located outside the coil support. Compared with the existing voice coil motor in which the permanent magnet is located inside the coil, the possibility of the motor shaft being magnetized by the permanent magnet is reduced, and the stability of the linear motion of the motor shaft is improved.

[0026] (4) The respiratory support equipment provided by the present invention uses two or more pressure relief valves in combination in the air circuit, which expands the pressure control range and improves the pressure control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is an exploded view of the pressure relief valve in Example 1;

[0028] Figure 2 Schematic diagram of the cross section of the pressure relief valve in Example 1;

[0029] Figure 3 Schematic diagram of the voice coil motor structure in Example 1;

[0030] Figure 4 This is a schematic diagram of the valve body structure in Example 1;

[0031] Figure 5 Schematic diagram of the air circuit structure of the respiratory support device in Example 2;

[0032] The above reference numerals:

[0033] 1. Valve body; 2. Diaphragm; 3. Voice coil motor;

[0034] 11. Air inlet; 12. Pressure relief port; 13. Second fixing hole;

[0035] 31. Housing; 32. Motor shaft; 33. Flexible spring; 34. Linear bearing; 35. Coil bracket; 36. Permanent magnet; 37. Fixed bracket; 38. Motor housing;

[0036] 382, first fixing hole; 383, heat dissipation hole;

[0037] A. Air source; B. Pressure relief valve; C. Flow sensor; D. Pressure sensor; E. Patient breathing port. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0040] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0041] The breathing control valve is a key component in a ventilator. Existing breathing control valves are generally configured as three-way pressure-balancing valves. With three-way valve control, both the valve's inlet and outlet need to be connected to the air circuit, which increases gas resistance. Furthermore, with only one valve for air release, the pressure release range is limited, and the controllable pressure range is also small. To address these issues, the present invention provides a two-way pressure relief valve that reduces gas resistance.

[0042] Example 1

[0043] like Figure 1-4 As shown, this embodiment provides a pressure relief valve, including a valve body 1, wherein the valve body 1 is a hollow structure provided with an air inlet 11 and a pressure relief port 12, a diaphragm 2 is provided at the lower part of the valve body 1, the air inlet 11 and the pressure relief port 12 are communicated through the space above the diaphragm 3, and a driving device is provided at the lower part of the diaphragm 2 for driving the diaphragm 2 to move up and down.

[0044] As a further improved technical solution, the air inlet 11 is arranged in the middle position of the upper part of the valve body 1 , and there are a plurality of pressure relief ports 12 , which are respectively arranged around the air inlet 11 .

[0045] In one embodiment, the valve body 1 of the pressure relief valve is a cylindrical structure with a hollow interior. An air inlet 11 is provided at the center of the upper portion, and a plurality of pressure relief ports 12 are provided around the air inlet 11. In other embodiments, the positions of the air inlet 11 and the plurality of pressure relief ports 12 can also be provided at other positions on the upper portion of the valve body 1, as long as the purpose of the present application can be achieved. A diaphragm 2 is provided at the lower portion of the pressure relief valve, and a portion of the gas entering the valve body 1 from the air inlet 11 will be discharged from the pressure relief port 12. The size of the space between the air inlet 11 and the pressure relief port 12 is changed by the up and down movement of the diaphragm 2, thereby achieving control over the amount of discharged gas, and the up and down movement of the diaphragm 2 is achieved by a driving device.

[0046] A two-way pressure relief valve is designed and applied to a branch of the respiratory airway. Simply connecting the airway at the air inlet 11 allows for regulation of the air flow and pressure in the respiratory airway, while also reducing gas resistance. Multiple pressure relief ports 12 are provided on the valve body 1, increasing the pressure relief range and the controllable pressure range.

[0047] In this embodiment, the driving mechanism is a voice coil motor 3, wherein the voice coil motor 3 includes a shell 31, a motor shaft 32 is provided in the middle of the shell 31, a flexible elastic member is provided on the upper part of the motor shaft 32, a coil bracket 35 is provided at the lower part of the motor shaft 32, a coil is fixed on the coil bracket 35, and a permanent magnet 36 is provided on the outside of the coil bracket 35.

[0048] As a further improvement, a guide member is provided at the bottom of the motor shaft to ensure linear motion. Furthermore, the guide member is a linear bearing 34, which is secured to the bottom of the motor shaft 32 via a fixing bracket 37.

[0049] During the specific implementation process, a motor shaft 32 is provided in the middle of the shell 31 of the voice coil motor 3, and a flexible elastic member is provided on the upper part of the motor shaft 32 to provide resistance and support for the motor shaft 32. A linear bearing 34 is provided at the lower part of the motor shaft 32 to ensure the stability of the motor shaft 32 in linear motion and reduce the fluctuation generated by the motor shaft 32 during the movement. A fixed bracket 37 is provided on the outside of the linear bearing 34. In this embodiment, the fixed bracket 37 is a cylindrical structure. A coil bracket 35 is provided around the outside of the fixed bracket 37. The coil is fixed on the coil bracket 35, and a permanent magnet 36 is provided on the outside of the coil bracket 35.

[0050] In this embodiment, the linear bearing 34 is an existing linear bearing, which mainly includes a bearing sleeve arranged on the outside and a steel ball retainer arranged on the inside. A plurality of steel balls are installed in the groove of the retainer for infinite circulation. The specific structure will not be repeated here.

[0051] The existing voice coil motor is equipped with flexible springs at the upper and lower positions of the coil, which makes it difficult to ensure concentricity, causing the motor shaft to fluctuate when performing up and down linear motion. At the same time, the elastic force of the two flexible springs is too large, and the voice coil motor requires greater power to achieve force balance. This embodiment uses a flexible spring 33 and a linear bearing 34 in combination to ensure the linear motion of the motor shaft 32 and improve the linear stability and accuracy of the motor shaft 32's motion stroke and current.

[0052] The permanent magnet 36 is located outside the coil support 35 , which reduces the possibility of the motor shaft 32 being magnetized by the permanent magnet 36 compared to the existing voice coil motor with the permanent magnet located inside the coil, and further improves the stability of the linear motion of the motor shaft 32 .

[0053] As a further improved technical solution, the flexible elastic member is a flexible spring sheet 33 , and the flexible spring sheet 33 is provided with a plurality of deformation holes, which are arranged in a spiral shape to ensure the deformation degree of the flexible elastic member.

[0054] In this embodiment, the flexible spring piece 33 is fixed on the motor shaft, and a plurality of deformation holes are provided on the flexible spring piece 33. The plurality of deformation holes are arranged in a spiral shape from the inside to the outside to ensure the deformation degree of the flexible spring piece 33 and prevent deformation difficulties.

[0055] As a further improved technical solution, a motor housing 38 is provided on the upper portion of the voice coil motor 3, and the voice coil motor 3 is connected to the lower portion of the valve body 1 through the motor housing 38. The motor shaft 32 of the voice coil motor 3 is connected to the diaphragm 2, and the motor shaft 32 drives the diaphragm 2 to move up and down.

[0056] In this embodiment, the motor housing 38 of the voice coil motor 3 is connected to the housing below the valve body 1. The motor shaft 32 of the voice coil motor 3 is connected to the diaphragm 2. The up-and-down movement of the motor shaft 32 causes the diaphragm 2 to move up and down along the inner wall of the valve body 1 within the space formed by the motor housing 38 and the valve body 1. When the diaphragm 2 moves upward, the space between the air inlet 11 and the pressure relief port 12 decreases, reducing the pressure relief capacity of the pressure relief port 12. When the diaphragm 2 moves downward, the space between the air inlet 11 and the pressure relief port 12 increases, increasing the pressure relief capacity of the pressure relief port 12.

[0057] As a further improved technical solution, a plurality of heat dissipation holes 383 are provided at the bottom of the motor housing 38 .

[0058] During the specific implementation process, the motor shaft 32 will generate a certain amount of heat after moving. Since a relatively closed space is formed between the diaphragm 2 and the motor housing 38 after the motor housing 38 is connected to the valve body 1, it is difficult for the heat to dissipate. Therefore, a number of heat dissipation holes 383 are provided on the motor housing 38, such as Figure 3 As shown, heat accumulation is prevented from affecting the voice coil motor 1 .

[0059] As a further improved technical solution, the motor housing 38 is detachably connected to the valve body 1 .

[0060] In this embodiment, a plurality of first fixing holes 382 are evenly spaced on the motor housing 38, and a plurality of second fixing holes 13 are evenly spaced on the housing below the valve body 1. The number of first fixing holes 382 and second fixing holes 13 is the same, so that the motor housing 36 and the valve body 1 are connected through the fixing holes. In other embodiments, since the valve body 1 is made of elastic plastic material, the valve body 1 and the motor housing 38 can be connected by a snap-fit ​​connection.

[0061] Example 2

[0062] This embodiment provides an air circuit of a respiratory support device, wherein the air circuit of the respiratory support device includes a flow sensor C, a pressure sensor D and the pressure relief valve B in Example 1, wherein the pressure relief valve B is arranged on a branch of the air circuit of the respiratory support device, and the number of pressure relief valves B is at least two.

[0063] In the specific implementation process, Figure 5 As shown, one end of the air circuit is connected to an air source A, and the other end is connected to the patient's respiratory port E. Air source A is used to provide an airflow with stable air pressure and flow. After the airflow is emitted from air source A, a branch is set in the air circuit. The other end of the branch pipe is connected to the air inlet 11 of the pressure relief valve B. Then, a flow sensor C and a pressure sensor D are respectively set in the air circuit to feedback real-time air pressure and flow. In other embodiments, according to usage needs, multiple branches can be set in the air circuit to connect to the pressure relief valve B. The combination of multiple pressure relief valves B expands the pressure control range and improves the pressure control accuracy. In this embodiment, two pressure relief valves B are set to be used together to control the pressure range.

[0064] Example 3

[0065] This embodiment provides a respiratory support device, wherein the respiratory support device includes the above-mentioned respiratory support device air circuit.

[0066] The working principle of the present invention is as follows:

[0067] When the patient inhales, the pressure in the air path needs to increase: at this time, the voice coil motor increases the output by increasing the current. At this time, the motor shaft pushes the diaphragm upward, which reduces the space between the air inlet and the pressure relief port, reduces the pressure relief capacity, and increases the air path pressure. When the air path pressure rises to the set value, the diaphragm stops moving upward and the size of the pressure relief port remains unchanged.

[0068] When the patient exhales, the pressure in the air path needs to be reduced: at this time, the voice coil motor reduces the output by reducing the current. At this time, the pressure provided to the diaphragm by the pressure relief valve is greater than the force of the motor shaft pushing the diaphragm. The diaphragm moves downward, the space between the air inlet and the pressure relief port increases, the pressure relief capacity increases, and the air path pressure decreases. Until the air path pressure drops to the set value, the diaphragm stops moving downward and the size of the pressure relief port remains unchanged.

[0069] The pressure relief valve disclosed in the present invention is provided with an air inlet and a pressure relief port at the upper part of the valve body at the same time. The gas flow is controlled by controlling the distance between the diaphragm and the pressure relief port. The pressure relief valve of the present invention is used to connect to the branch of the air circuit of the respiratory support equipment. It is connected to the main circuit of the air circuit through an air inlet, which can reduce the gas resistance of the air circuit of the respiratory support equipment. The pressure control is achieved by controlling the pressure relief size of the pressure relief valve on the branch. Two or more pressure relief valves are used in combination in the air circuit according to the needs of use, which expands the pressure control range and improves the pressure control accuracy.

[0070] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of protection of the present invention.

Claims

1. A respiratory support device air circuit, characterized in that: The air circuit of the respiratory support device includes a flow sensor, a pressure sensor, and a pressure relief valve, wherein the pressure relief valve is arranged on a branch of the air circuit of the respiratory support device, and the number of the pressure relief valves is at least two; one end of the air circuit is connected to the air source, and the other end is connected to the respiratory port; the pressure relief valve includes a valve body, which is a hollow structure with an air inlet and a pressure relief port, a diaphragm is provided at the lower part of the valve body, the air inlet and the pressure relief port are connected through the space above the diaphragm, and a driving device is provided at the lower part of the diaphragm for driving the diaphragm to move up and down; The branch stream is connected to the air inlet.

2. A respiratory support device air circuit according to claim 1, characterized in that: The air inlet is arranged at the middle position of the upper part of the valve body, and the number of the pressure relief ports is several, and the pressure relief ports are respectively arranged around the air inlet.

3. The respiratory support device air circuit according to claim 1, characterized in that: The driving mechanism is a voice coil motor, which includes a shell, a motor shaft is provided in the middle of the shell, a flexible elastic member is provided on the upper part of the motor shaft, a coil bracket is provided at the lower part of the motor shaft, a coil is fixed on the coil bracket, and a permanent magnet is provided on the outside of the coil bracket.

4. A respiratory support device air circuit according to claim 3, characterized in that: A guide component is also provided at the lower portion of the motor shaft to ensure that the motor shaft moves in a straight line.

5. The respiratory support device air circuit according to claim 4, characterized in that: The guide component is a linear bearing, and the linear bearing is fixed to the lower part of the motor shaft through a fixing bracket.

6. The respiratory support device air circuit according to claim 3, characterized in that: The flexible elastic member is a flexible spring sheet, and a plurality of deformation holes are provided on the flexible spring sheet. The deformation holes are arranged in a spiral shape to ensure the deformation degree of the flexible elastic member.

7. The respiratory support device air circuit according to claim 3, characterized in that: A motor housing is provided on the upper portion of the voice coil motor, and the voice coil motor is connected to the lower portion of the valve body through the motor housing. A plurality of heat dissipation holes are provided on the bottom of the motor housing.

8. The respiratory support device air circuit according to claim 3, characterized in that: The motor shaft of the voice coil motor is connected to the diaphragm, and the motor shaft drives the diaphragm to move up and down.

9. A respiratory support device, characterized in that The respiratory support device comprises the respiratory support device air circuit of claim 1 .

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