Double-channel flow control valve and positive and negative pressure medical equipment

Abstract

The embodiment of the invention provides a double-channel flow control valve and positive and negative pressure medical equipment. The double-channel flow control valve comprises a valve body and a valve element, the valve body is provided with a hollow inner cavity, and the valve body is provided with a first input port, a second input port and a first output port; the valve element is arranged in the hollow inner cavity and provided with a first flow channel, and one end of the first flow channel communicates with the first output port. The valve element is movably connected to the hollow inner cavity so that at most one of the first input port and the second input port can communicate with the other end of the first flow channel. When the first input port is communicated with the first flow channel, the first input port, the first flow channel and the first output port form a positive pressure channel; when the second input port communicates with the first flow channel, the second input port, the first flow channel and the first output port form a negative pressure channel. According to the dual-channel flow control valve, rapid switching between a positive pressure channel and a negative pressure channel can be achieved, continuous adjustment of flow or pressure can be achieved, and a flow oscillation waveform or a pressure oscillation waveform meeting requirements can be output.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a dual-channel flow control valve and a positive and negative pressure medical device. Background Technology

[0002] Positive and negative pressure medical devices such as expectorants and thoracic ventilators require precise pressure and flow control in both positive and negative channels to output the expected clinical treatment waveform, which is a core requirement for ensuring treatment effectiveness. Existing technologies mainly employ two approaches: First, controlling independent positive and negative pressure sources through multiple valve combinations. While this achieves basic channel switching, the airway structure is complex, costly, bulky, and has low integration. Second, using stepper or servo motors to drive gate rotation for channel switching; however, this method has a single rotation direction and uncontrollable gate position, only enabling channel opening and closing, and cannot achieve continuous dynamic adjustment of pressure and flow, limiting its application scenarios. Summary of the Invention

[0003] To solve or partially solve the above problems, this invention discloses a dual-channel flow control valve and a positive and negative pressure medical device, thereby realizing dual-channel pressure and flow switching and continuous dynamic adjustment control.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of the present invention provide a dual-channel flow control valve having intersecting first and second directions. The dual-channel flow control valve includes a valve body and a valve core. The valve body has a hollow inner cavity and is provided with a first input port, a second input port, and a first output port. The valve core is disposed in the hollow inner cavity and has a first flow channel, one end of which is connected to the first output port. The valve core is movably connected to the hollow inner cavity such that at most one of the first input port and the second input port is connected to the other end of the first flow channel. When the first input port is connected to the first flow channel, the first input port, the first flow channel, and the first output port form a positive pressure channel; when the second input port is connected to the first flow channel, the second input port, the first flow channel, and the first output port form a negative pressure channel.

[0005] Optionally, the dual-channel flow control valve further includes a drive element connected to the valve core and used to drive the valve core to reciprocate.

[0006] Optionally, the hollow inner cavity extends linearly along the first direction, the valve core reciprocates linearly within the hollow inner cavity, and the valve core is slidably connected to the hollow inner cavity.

[0007] Optionally, the dual-channel flow control valve further includes an elastic element, which is disposed at both ends of the valve core along the first direction, and is sandwiched between the valve core and the valve body.

[0008] Optionally, either the outer wall of the valve core away from the drive member along the first direction or the inner wall of the valve body away from the drive member along the first direction is provided with a snap-fit ​​groove, and the other one is provided with a snap-fit ​​protrusion. One end of the elastic member is inserted into the snap-fit ​​groove, and the other end is inserted into the snap-fit ​​protrusion.

[0009] Optionally, the valve body includes a sealing portion located between the first inlet and the second inlet, the sealing portion being used to block the first port, and the outer wall of the sealing portion being provided with a plurality of sealing rings.

[0010] Optionally, the valve body is further provided with a second output port and a third output port, and the valve core is further provided with a second flow channel and a third flow channel; when the first input port is connected to the first flow channel, the two ends of the second flow channel are respectively connected to the second input port and the second output port; when the second input port is connected to the first flow channel, the two ends of the third flow channel are respectively connected to the first input port and the third output port.

[0011] Optionally, either the valve body or the valve core is provided with a guide groove, and either of them is provided with a guide rail. The guide rail and the guide groove are slidably connected and both extend along the first direction.

[0012] Optionally, the first port has a projection perpendicular to the second direction, and the shape of the projection is any one of a rectangle, a fan-shaped ring, an ellipse, a circle, and a triangle.

[0013] On the other hand, embodiments of the present invention also provide a positive and negative pressure medical device, which includes a dual-channel flow control valve as described in any of the above embodiments.

[0014] The dual-channel flow control valve in this embodiment consists of a valve body and a valve core. The valve body has a hollow inner cavity, and the valve core is movably connected within the hollow inner cavity, allowing the valve core to occupy different positions within the cavity. The valve body has a first inlet, a second inlet, and a first outlet, while the valve core has a first flow channel. One end of the first flow channel is always connected to the first outlet, while the other end of the first flow channel is connected to at most one of the first inlet or the second inlet. When the first inlet is connected to the first flow channel, the first inlet, the first flow channel, and the first outlet form a positive pressure channel. When the second inlet is connected to the first flow channel, the second inlet, the first flow channel, and the first outlet form a negative pressure channel. Furthermore, as the valve core moves, the connection area between the first flow channel and the first inlet, as well as the connection area between the first flow channel and the second inlet, can be changed, thereby altering the flow rate or pressure of the positive and negative pressure channels. This not only enables switching between positive and negative pressure channels but also allows for changes in the flow rate and pressure of the fluid within the channels as needed. This dual-channel flow control valve can quickly switch between positive and negative pressure channels, and can continuously adjust the flow or pressure, outputting a flow oscillation waveform or pressure oscillation waveform that meets the requirements. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a front view of the dual-channel flow control valve provided in an embodiment of the present invention; Figure 2 This is a longitudinal cross-sectional view of the dual-channel flow control valve provided in an embodiment of the present invention; Figure 3 This is an exploded view of the dual-channel flow control valve provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the shape of the first port projection provided in an embodiment of the present invention.

[0017] Explanation of reference numerals in the attached drawings: 10, valve body; 11, first input port; 12, second input port; 13, first output port; 14, second output port; 15, third output port; 101, valve cover; 110, sealing part; 111, sealing ring; 120, snap-fit ​​protrusion; 20, valve core; 21, first port; 22, second port; 23, third port; 24, fourth port; 25, fifth port; 26, sixth port; 210, snap-fit ​​groove; 30, driving element; 40, elastic element. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In this application, the term "parallel" includes not only absolute parallelism but also approximate parallelism as commonly understood in engineering. For example, "parallel" refers to the angle between two lines, a line and a surface, or a surface and another surface, where the angle is -1° to 1°. Similarly, "perpendicular" also includes not only absolute perpendicularity but also approximate perpendicularity as commonly understood in engineering. For example, "perpendicular" refers to the angle between two lines, a line and a surface, or a surface and another surface, where the angle is 89° to 91°. Equal distances or equal angles include not only absolute equality but also approximate equality as commonly understood in engineering, meaning there may be a certain degree of error, such as a tolerance range of -1% to 1%.

[0020] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0021] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a dual-channel flow control valve with intersecting first and second directions. The dual-channel flow control valve includes a valve body 10 and a valve core 20. The valve body 10 has a hollow inner cavity and is provided with a first input port 11, a second input port 12, and a first output port 13. The valve core 20 is disposed in the hollow inner cavity and has a first flow channel. One end of the first flow channel is connected to the first output port 13. The valve core 20 is movably connected to the hollow inner cavity so that at most one of the first input port 11 and the second input port 12 is connected to the other end of the first flow channel. When the first input port 11 is connected to the first flow channel, the first input port 11, the first flow channel, and the first output port 13 form a positive pressure channel. When the second input port 12 is connected to the first flow channel, the second input port 12, the first flow channel, and the first output port 13 form a negative pressure channel.

[0022] The dual-channel flow control valve in this embodiment consists of a valve body 10 and a valve core 20. The valve body 10 has a hollow inner cavity, and the valve core 20 is movably connected within the hollow inner cavity. Specifically, the valve core 20 can move left and right along the X direction, allowing it to occupy different positions within the hollow inner cavity. The valve body 10 has a first input port 11, a second input port 12, and a first output port 13. The valve core 20 has a first flow channel, one end of which is always connected to the first output port 13, while the other end of the first flow channel is connected to at most one of the first input port 11 and the second input port 12. When the first input port... When the first inlet 11 is connected to the first flow channel, the first inlet 11, the first flow channel, and the first outlet 13 form a positive pressure channel. When the second inlet 12 is connected to the first flow channel, the second inlet 12, the first flow channel, and the first outlet 13 form a negative pressure channel. Furthermore, with the movement of the valve core 20, the connection area between the first flow channel and the first inlet 11, as well as the connection area between the first flow channel and the second inlet 12, can be changed, thereby altering the flow rate or pressure in the positive and negative pressure channels. This not only enables switching between positive and negative pressure channels but also allows for changes in the flow rate and pressure of the fluid within the channels as needed. This dual-channel flow control valve can achieve rapid switching between positive and negative pressure channels and continuous adjustment of flow rate or pressure, outputting a flow oscillation waveform or pressure oscillation waveform that meets the requirements.

[0023] Furthermore, the dual-channel flow control valve also includes a drive component 30, which is connected to the valve core 20 and used to drive the valve core 20 to reciprocate. The drive component 30 is fixedly mounted on the valve body 10, and its output end is connected to the valve core 20, thereby driving the valve core 20 to reciprocate, thus switching between the positive pressure channel and the negative pressure channel. Simultaneously, it achieves pressure or flow regulation in either the positive or negative pressure channel, all using an automated regulation method, which is more convenient and has higher regulation accuracy.

[0024] Optionally, the hollow inner cavity extends linearly along the first direction, and the valve core 20 reciprocates linearly within the hollow inner cavity, with the valve core 20 slidably connected to the hollow inner cavity. In this embodiment, both the valve body 10 and the valve core 20 are cylindrical, and the hollow inner cavity is also cylindrical. The valve core 20 reciprocates within the hollow inner cavity along the axial direction of the cylinder. The driving component 30 can be a voice coil motor or a linear motor, etc., which can drive the valve core 20 to perform axial translational movement relative to its axial direction, accurately controlling the rapid and precise movement of the valve core 20 relative to the valve body 10.

[0025] like Figure 2As shown, the dual-channel flow control valve also includes an elastic element 40. The elastic element 40 and the driving element 30 are respectively disposed at both ends of the valve core 20 along the first direction, and the elastic element 40 is sandwiched between the valve core 20 and the valve body 10. In this embodiment, the elastic element 40 is a spring. When the driving element 30 drives the valve core 20 to move, the spring undergoes a certain compression displacement, which is proportional to the force applied by the driving element 30. When the driving force of the driving element 30 decreases, the spring force pushes the valve core 20 to move in the opposite direction to the corresponding position. The driving force of the driving element 30 and the spring force form a set of axial balance relationships, which together determine the position of the valve core 20. As described above, the current applied by the coil is proportional to the generated electromagnetic force, that is, the displacement of the valve core 20 is proportional to the applied current. By controlling the magnitude of the coil current, precise control of the position of the valve core 20 can be achieved.

[0026] Furthermore, either the outer wall of the valve core 20 away from the drive member 30 along the first direction or the inner wall of the valve body 10 away from the drive member 30 along the first direction is provided with a locking groove 210, and the other is provided with a locking protrusion 120. One end of the elastic member 40 is inserted into the locking groove 210, and the other end is inserted into the locking protrusion 120. The locking protrusion 120 and the locking groove 210 can limit and fix both ends of the elastic member 40, ensuring that the elastic member 40 can always deform along its own axis, providing a stable axial elastic force, avoiding radial offset and bending, and improving the precise control of the valve core 20 position.

[0027] Optionally, the valve body 10 includes a sealing portion 110 located between the first inlet 11 and the second inlet 12. The sealing portion 110 is used to block the first port 21, and a plurality of sealing rings 111 are provided on the outer wall of the sealing portion 110. Specifically, the sealing portion 110 is provided so that when the first port 21 of the valve core 20 moves to the sealing portion 110, the first port 21 is sealed and blocked, so that the dual-channel flow control valve has a closed state.

[0028] In this embodiment, the sealing part 110 is provided with a plurality of sealing rings 111. The sealing rings 111 can achieve a seal between the first input port 11 and the second input port 12 when the dual-channel flow control valve is installed, so as to avoid cross-flow between the first input port 11 and the second input port 12, and at the same time prevent air leakage between the first input port 11 and the second input port 12.

[0029] like Figure 2 and Figure 3As shown, the valve body 10 is further provided with a second output port 14 and a third output port 15, and the valve core 20 also has a second flow channel and a third flow channel; when the first input port 11 is connected to the first flow channel, the two ends of the second flow channel are respectively connected to the second input port 12 and the second output port 14; when the second input port 12 is connected to the first flow channel, the two ends of the third flow channel are respectively connected to the first input port 11 and the third output port 15. When the first input port 11 is connected to the first flow channel, the two ends of the second flow channel are respectively connected to the second input port 12 and the second output port 14, thereby connecting the negative pressure of the second input port 12 to the atmosphere through the second output port 14; at the same time, when the second input port 12 is connected to the first flow channel, the two ends of the third flow channel are respectively connected to the first input port 11 and the third output port 15, thereby connecting the positive pressure of the first input port 11 to the atmosphere through the third output port 15; thus, the pressure of the first input port 11 and the second input port 12 can be released, avoiding blockage and damage to the pressure equipment set in the first input port 11 and the second input port 12.

[0030] In this embodiment, the two ends of the first flow channel are the first port 21 and the second port 22, the two ends of the second flow channel are the third port 23 and the fourth port 24, and the two ends of the third flow channel are the fifth port 25 and the sixth port 26. At most one of the first input port 11 and the second input port 12 is connected to the first port 21, and the second port 22 is always connected to the first output port 13. When the first input port 11 is connected to the first port 21, the third port 23 is connected to the second input port 12, and the fourth port 24 is connected to the second output port 14. When the second input port 12 is connected to the first port 21, the fifth port 25 is connected to the first input port 11, and the sixth port 26 is connected to the third output port 15. Further details are omitted here.

[0031] Optionally, either the valve body 10 or the valve core 20 is provided with a guide groove, and either one is provided with a guide rail. The guide rail and the guide groove are slidably connected and both extend along the first direction. Specifically, multiple guide grooves and guide rails are provided in a one-to-one correspondence. The inner wall of the guide groove and the guide rail are structurally precisely matched, guiding the valve core 20. This restricts the valve core 20 to axial translational movement only, preventing rotational movement and limiting the range of movement of the valve core 20. This improves the certainty of the valve core 20's position and direction of movement, reduces radial sway or offset, and prevents changes in the valve core 20's position due to vibration, installation, wear, or other factors, ensuring the smooth operation of the dual-channel flow control valve.

[0032] To improve the response speed of the valve core 20, the frictional force experienced by the valve core 20 during high-speed movement needs to be minimized in the design. Structurally, the contact area and stress on the contact area should be reduced during relative movement between the valve core 20 and the valve body 10. The clearance between the valve core 20 and the valve body 10 should be as small as possible to minimize friction; the two should only contact each other through guide grooves and guide rails on the surface of the valve core 20 to achieve relative sealing.

[0033] In this embodiment, the driving component 30 is a voice coil motor, comprising a valve cover 101, an electromagnet, a coil 3, and a mover wound with the coil. The valve cover 101 is fixed to the valve body 10, thereby accommodating and fixing the voice coil motor within the valve body 10. The coil is wound on the mover, which is connected to the valve core 20. Their structure can be integral or connected together by a fixing component. When current is applied, the coil experiences electromagnetic force in the magnetic field, driving the mover and valve core 20 to reciprocate in the horizontal axial direction. The current applied to the coil is proportional to the generated electromagnetic force; therefore, the amplitude and speed of the valve core 20's movement can be adjusted by changing the magnitude and frequency of the current, which will not be elaborated further here.

[0034] Voice coil motors are characterized by high frequency response, high speed, and high precision. By applying a current with controllable frequency and amplitude to the voice coil motor, the valve core 20 can be driven to reciprocate at high frequency within a certain position range. Correspondingly, the valve port diameter between the first flow channel of the valve core 20 and the first input port 11 or the second input port 12 of the valve body 10 will also change repeatedly at high frequency. As a result, an oscillating pressure and flow waveform with controllable frequency and amplitude is output at the first output port 13. The output oscillating pressure and flow can be positive or negative, depending on the position of the valve core 20.

[0035] To better meet the application requirements of the dual-channel flow control valve in more scenarios in the embodiments of the present invention, changing the position and shape of certain ports can also achieve similar effects to the present invention.

[0036] Optionally, the two ends of the valve, such as the two ends of the valve body 10, the valve cover 101, and the coil portion of the valve core 20, can be designed as open ports, replacing the fourth port 24 and the sixth port 26 of the valve core 20, as well as the second output port 14 and the third output port 15 of the housing. This design reduces the complexity of manufacturing the valve body 10 and the valve ports, and also facilitates sealing and isolation from other ports by optimizing the positions of the intake and exhaust channels. Simultaneously, the intake or exhaust can be used to dissipate heat from the voice coil motor coil or the valve body 10.

[0037] Considering the medical applications of this dual-channel flow control valve, it is required that the degree of wear during use be minimized and that no wear particles be generated. Preferably, the valve core 20 and valve body 10 are constructed of lightweight, high-strength, and wear-resistant materials, and preferably of materials with self-lubricating properties, such as PEEK (polyether ether ketone).

[0038] like Figure 4 As shown, the first port 21 has a projection perpendicular to the second direction, and the shape of the projection is any one of rectangle, sector, ellipse, circle, and triangle. Variations in the shape, position, and number of valve ports can also achieve the technical solution of this patent. In this example, multiple rectangular holes are preferred as the shape of the valve ports. The flow diameter of the valve ports is changed by the position between the valve core 20 and the sleeve, thereby achieving the purpose of input channel selection and flow pressure regulation. Optionally, the shape of the valve ports can be designed as rectangular, sector, ellipse, or V-shaped, and the position of the valve ports can also achieve similar purposes to this invention.

[0039] The dual-channel flow control valve in this embodiment has three positions. For ease of description, it is assumed that the first input port 11 and the second input port 12 are respectively connected to the positive and negative pressure source sides of the turbine fan. By controlling the movement of the drive component 30 in this invention, the switching of positive and negative pressure output and the regulation of pressure and flow can be realized.

[0040] When the voice coil motor drives the valve core 20 to move to the first position, the positive pressure of the first input port 11 is connected to the first output port 13. The positive pressure gas connected to the first input port 11 is output from the first output port 13 through the first flow channel. At the same time, the gas in the atmosphere enters the fan. The turbine fan pumps the gas into the first input port 11 through the high-speed rotation of the fan blades, which serves as the source of the output positive pressure gas. At this time, the negative pressure second input port 12 is connected to the atmosphere through the second flow channel.

[0041] When the voice coil motor drives the valve core 20 to the second position, neither the first input port 11 nor the second input port 12 is connected to the first output port 13, and there is no gas output at the first output port 13. At this time, the first port 21 of the first flow channel is blocked by the sealing part 110.

[0042] When the voice coil motor drives the valve core 20 to move to the third position, the second input port 12 is connected to the first output port 13, and the first output port 13 is connected to the negative pressure side connected to the second input port 12. The pressure at the output port is negative. At this time, the positive pressure side of the turbine fan connected to the first output port 13 draws the gas out of the atmosphere, so that the air inlet of the turbine fan forms a negative pressure, which serves as the source of negative pressure for the second input port 12. At this time, the positive pressure first input port 11 is connected to the atmosphere through the third flow channel.

[0043] When the voice coil motor drives the valve core 20 to move between the first and third positions, and not in the second position, the flow cross-sectional area formed between the first port 21 of the valve core 20 and the first input port 11 or the second input port 12 can continuously change from zero to the maximum opening, so that the pressure and flow rate flowing into the first output port 13 through the first input port 11 or the second input port 12 also continuously change. That is to say, by controlling the current of the voice coil motor, the valve port diameter can be continuously adjusted, thereby achieving continuous adjustment of pressure and flow rate.

[0044] On the other hand, embodiments of the present invention also provide a positive and negative pressure medical device, which includes a dual-channel flow control valve as described in any of the above embodiments. A positive and negative pressure medical device refers to a medical device with both positive and negative pressure modes, which can be connected to a patient through different interfaces to provide support and auxiliary treatment for the respiratory system. The positive pressure mode is mainly used for the treatment of respiratory failure, such as acute respiratory distress syndrome; the negative pressure mode is mainly used for treatments such as chest aspiration and oxygen inhalation. This positive and negative pressure medical device can be a cough suppressant or a thoracic ventilator, and typically requires control at both positive and negative channel pressure and flow levels to generate the clinically expected therapeutic waveform. This dual-channel flow control valve can also be used in the production and design of the oscillator for the positive and negative pressure medical device to generate the required positive and negative pressure dual-channel pressure waveforms, which will not be elaborated further here.

[0045] The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0046] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0047] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0048] The present invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A dual-channel flow control valve, characterized in that, Having intersecting first direction (X) and second direction (Y), including: The valve body (10) has a hollow inner cavity and is provided with a first input port (11), a second input port (12) and a first output port (13). A valve core (20) is disposed in the hollow inner cavity. The valve core (20) has a first flow channel, one end of which is connected to the first output port (13). The valve core (20) is movably connected to the hollow inner cavity such that at most one of the first input port (11) and the second input port (12) is connected to the other end of the first flow channel. When the first input port (11) is connected to the first flow channel, the first input port (11), the first flow channel and the first output port (13) form a positive pressure channel; when the second input port (12) is connected to the first flow channel, the second input port (12), the first flow channel and the first output port (13) form a negative pressure channel.

2. The dual-channel flow control valve according to claim 1, characterized in that, The dual-channel flow control valve also includes a drive unit (30), which is connected to the valve core (20) and is used to drive the valve core (20) to reciprocate.

3. The dual-channel flow control valve according to claim 2, characterized in that, The hollow inner cavity extends linearly along the first direction (X), the valve core (20) reciprocates linearly within the hollow inner cavity, and the valve core (20) is slidably connected to the hollow inner cavity.

4. The dual-channel flow control valve according to claim 3, characterized in that, The dual-channel flow control valve also includes an elastic element (40), which is disposed at both ends of the valve core (20) along the first direction (X) and the drive element (30). The elastic element (40) is sandwiched between the valve core (20) and the valve body (10).

5. The dual-channel flow control valve according to claim 4, characterized in that, The valve core (20) has a snap-fit ​​groove (210) on one of its outer walls away from the drive member (30) along the first direction (X) and the valve body (10) has a snap-fit ​​protrusion (120) on one of its inner walls away from the drive member (30) along the first direction (X). One end of the elastic member (40) is inserted into the snap-fit ​​groove (210) and the other end is inserted into the snap-fit ​​protrusion (120).

6. The dual-channel flow control valve according to any one of claims 1-5, characterized in that, The valve body (10) includes a sealing part (110) located between the first input port (11) and the second input port (12). The sealing part (110) is used to block the first port (21). The outer wall of the sealing part (110) is provided with a plurality of sealing rings (111).

7. The dual-channel flow control valve according to any one of claims 1-5, characterized in that, The valve body (10) is also provided with a second output port (14) and a third output port (15), and the valve core (20) is also provided with a second flow channel and a third flow channel; when the first input port (11) is connected to the first flow channel, the two ends of the second flow channel are respectively connected to the second input port (12) and the second output port (14); when the second input port (12) is connected to the first flow channel, the two ends of the third flow channel are respectively connected to the first input port (11) and the third output port (15).

8. The dual-channel flow control valve according to any one of claims 1-5, characterized in that, The valve body (10) and the valve core (20) are provided with a guide groove and a guide rail. The guide rail and the guide groove are slidably connected and both extend along the first direction (X).

9. The dual-channel flow control valve according to any one of claims 1-5, characterized in that, The first port (21) has a projection perpendicular to the second direction (Y), and the shape of the projection is any one of a rectangle, a fan-shaped ring, an ellipse, a circle, and a triangle.

10. A positive and negative pressure medical device, characterized in that, Includes a dual-channel flow control valve as described in any one of claims 1-9.

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