A microfluidic control device

Abstract

The present invention relates to a microfluidic control device, including a microfluidic chip, an adaptive liquid driving structure and a spring valve body structure, wherein the microfluidic chip is composed of a film back plate, a film and a fixed plate, wherein the film is clamped between the film back plate and the fixed plate, wherein a first space, a valve body placement space and a second space are provided on the fixed plate, wherein a liquid injection port is provided on the film back plate, wherein the liquid injection port is located above the first space and is used to inject liquid into a first liquid storage tank, wherein a flow channel gap is formed between the film and the film back plate, wherein the flow channel gap extends from the first liquid storage tank to the second liquid storage tank, wherein the spring valve body structure is provided in the valve body placement space and is used to control the opening or closing of the flow channel gap, wherein the adaptive liquid driving structure is provided at the first space and is used to provide an extrusion force to the first liquid storage tank, wherein when the spring valve body structure is opened, the liquid in the first liquid storage tank is pushed toward the flow channel gap and enters the second liquid storage tank through the flow channel gap. The present invention has good driving effect and good flow blocking effect.

Description

Technical Field

[0001] The invention belongs to the field of microfluidics technology, and in particular relates to a microfluidic control device. Background Art

[0002] Microfluidics usually refers to fluids flowing in micrometer-scale space. The science and technology for manipulating and processing the flow of microfluids is called microfluidics. This technology involves many fields such as chemistry, fluid physics, microelectronics, new materials, biology and biomedical engineering, and is an emerging interdisciplinary subject. Microfluidic chips integrate the basic functions of laboratories such as chemistry and biology into a chip of only a few square centimeters in size, and use microfluidics technology to manipulate and process liquids. It is widely used in cell analysis, nucleic acid extraction, nucleic acid amplification, biochemical detection, immunoassay and other related fields.

[0003] At present, commonly used microfluidic valves include pneumatic valves, paraffin valves, heating valves, electromagnetic valves, valves composed of motor telescopic valves and other types of valves. Among these valves, pneumatic valves require a special air source, and external air sources may cause pollution; some microfluidic valves have poor portability and can only be used in a certain microfluidic device; and paraffin valves can only be used once and cannot be repeatedly operated. Some microfluidic valves have complex structures, making the microfluidic platform too large, and the processing, assembly and use are not convenient; some electromagnetic valves currently require the support of external devices and are normally open valves. The opening and closing of the valve can only be controlled when the power is on, which is not conducive to transportation and storage, and cannot achieve the effect of the valve well. Summary of the invention

[0004] Based on the problems existing in the microfluidic valves in the prior art, the present invention provides a new microfluidic control device.

[0005] The microfluidic control device provided by the present invention adopts a spring and a metal block as a valve structure, and is a normally closed valve without the need for external equipment, has a simple structure, and has a good flow blocking effect; its valve control device is an electromagnet, which is easy to obtain, has strong versatility, and can be used repeatedly; its adaptive magneto-electric liquid driving structure adopts a special joint structure, has an adaptive adjustment function, can better compensate for errors in the production and assembly processes, has good accuracy, and is quick to respond; its liquid storage method is a thin film inflation type, which is low in cost and easy to operate.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The present invention provides a microfluidic control device, comprising a microfluidic chip, an adaptive liquid driving structure and a spring valve body structure.

[0008] The microfluidic chip is composed of a film back plate, a film and a fixed plate, wherein the film back plate, the film and the fixed plate are arranged in parallel, and the film is clamped between the film back plate and the fixed plate.

[0009] The fixing plate is provided with a first space, a valve body placement space, and a second space that penetrates the upper and lower sides of the fixing plate. The valve body placement space is located between the first space and the second space. In the first space and the second space, the film is not pressed by the fixing plate, and the film is allowed to deform to form a first liquid storage tank and a second liquid storage tank, respectively.

[0010] The film back plate is provided with a liquid injection port, which is located above the first space and is used to inject liquid into the first liquid storage tank.

[0011] A flow channel gap is formed between the film and the film back plate, and the flow channel gap extends from the first liquid storage tank to the second liquid storage tank.

[0012] The spring valve body structure is arranged in the valve body placement space and is used to control the opening or closing of the flow channel gap.

[0013] The adaptive liquid driving structure is arranged in the first space, and is used to provide extrusion force to the first liquid storage tank. When the spring valve body structure is opened, the liquid in the first liquid storage tank is pushed toward the flow channel gap and enters the second liquid storage tank through the flow channel gap.

[0014] In one embodiment of the present invention, the spring valve body structure is composed of a valve body device and an electromagnet. The valve body structure is a normally closed valve body structure. The valve body device is composed of a metal block and a first spring. The metal block and the first spring are embedded in the valve body placement space of the fixed plate from the upper side. The outer diameter of the first spring is larger than the lower end outlet of the valve body placement space, forming a mechanical restriction, generating a force toward the film, forcing the metal block to be pressed tightly against the flow channel gap, and the flow channel gap is closed; when the electromagnet is energized, it generates an attractive force, overcomes the spring force, and draws the metal block downward, and the flow channel gap opens.

[0015] In one embodiment of the present invention, the metal block is composed of two cylinders of different diameters, the diameter of the large diameter cylinder is larger than the diameter of the inner ring of the first spring, the diameter of the small diameter cylinder is less than or equal to the diameter of the inner ring of the first spring, the small diameter cylinder fits the first spring, and is placed into the valve body placement space from the upper end of the valve body placement space.

[0016] In one embodiment of the present invention, the size of the first spring can be changed according to the required pressure to obtain a larger or smaller valve pressure to achieve the purpose of controlling valves of different flow rates.

[0017] In one embodiment of the present invention, the electromagnet includes an electromagnet shell, an electromagnet metal stick, an electromagnet coil frame and an electromagnet electromagnetic coil, the electromagnet metal stick is located in the middle of the electromagnet shell, the electromagnet coil frame is located outside the electromagnet metal stick, the electromagnet electromagnetic coil is wound on the electromagnet coil frame, the electromagnet electromagnetic coil is connected to an external power supply, and the electromagnet metal stick is located below the metal block. When current passes through the electromagnet electromagnetic coil, a magnetic field is generated, and the magnetic field acts on the electromagnet metal stick, and the electromagnet metal stick generates an attractive force. The metal block is affected by the attractive force, overcomes the spring force, moves downward, and the flow channel gap opens, that is, the valve opens, and the liquid can flow in the flow channel gap.

[0018] In one embodiment of the present invention, the electromagnet housing is fixed on a fixing plate.

[0019] In one embodiment of the present invention, the adaptive liquid driving structure is composed of an adaptive piston and an electromagnetic push rod device. When the electromagnetic push rod device is powered on, the electromagnetic push rod device pushes the adaptive piston to move, and the bulging first liquid storage tank is squeezed by the adaptive piston. When the spring valve body structure is opened, the liquid in the first liquid storage tank is pushed toward the flow channel gap and enters the second liquid storage tank through the flow channel gap.

[0020] In one embodiment of the present invention, when the electromagnetic push rod device acts on the adaptive piston, the adaptive piston will adaptively adjust the angle of the adaptive piston according to the angle between the film surface and the horizontal plane after being acted upon by the force.

[0021] In one embodiment of the present invention, the electromagnetic push rod device includes a metal push rod, a push rod device housing, a push rod device electromagnetic coil, and a push rod device coil frame. The metal push rod is located in the middle of the push rod device housing, the push rod device coil frame is located on the outside of the metal push rod, the push rod device electromagnetic coil is wound on the push rod device coil frame, the metal push rod is constrained by a second spring below, the push rod device electromagnetic coil is connected to an external power supply, and the electromagnet metal rod is located below the adaptive piston. When current passes through the push rod device electromagnetic coil, a magnetic field is generated, and the magnetic field acts on the metal push rod. The metal push rod overcomes the spring force and moves upward, pushing the adaptive piston to squeeze the first liquid storage tank. When the spring valve body structure is opened, the liquid in the first liquid storage tank is pushed toward the flow channel gap and enters the second liquid storage tank through the flow channel gap, thereby achieving control of the liquid.

[0022] In one embodiment of the present invention, the size of the adaptive piston adapts to the size of the first space, and the electromagnetic push rod device pushes the adaptive piston to drive the liquid.

[0023] In one embodiment of the present invention, the push rod device housing is fixed on a fixing plate.

[0024] In one embodiment of the present invention, there is an adaptive piston groove on the adaptive piston, and a circular push head of a metal push rod is formed above the metal push rod, and the circular push head of the metal push rod is located in the adaptive piston groove, and the adaptive piston groove and the circular push head of the metal push rod are completely matched, and the adaptive piston groove and the circular push head of the metal push rod constitute an adaptive function. When the film and the electromagnetic push rod device are pushed upward, the film and the electromagnetic push rod device generate an extrusion force on the adaptive piston groove and the circular push head of the metal push rod, and the adaptive piston groove and the circular push head of the metal push rod are completely matched, and can be rotated in multiple directions. When the film or the adaptive piston is not completely horizontal, the extrusion force will cause the angle of the adaptive piston groove and the circular push head of the metal push rod, which were originally in a horizontal state, to deflect to adapt to the angle that may be generated by the contact surface. This design can eliminate assembly errors and processing errors, making liquid discharge more complete.

[0025] In one embodiment of the present invention, a cover is provided in the liquid injection port, and the cover is used to inject liquid into the film when opened.

[0026] In one embodiment of the present invention, the fixing plate covers the film to enhance the fixing effect.

[0027] In one embodiment of the present invention, a flow channel space for forming a flow channel gap is reserved between the first space and the second space on the fixing plate.

[0028] In one embodiment of the present invention, the film backplane is connected to the film by bonding.

[0029] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0030] The valve body structure of the present invention belongs to a normally closed valve body structure. After the external device is evacuated, the valve can still be closed, and it has strong mobility and portability. The valve body structure only uses a metal block and a first spring, and the structure is simple and easy to process. The selection of the first spring can be changed according to the required pressure to achieve control of different micro-flows, and it has strong adaptability. The adaptive magneto-electric liquid drive structure of the present invention; the size of its liquid storage volume can be changed by changing the expansion effect of the liquid storage tank diameter membrane, and the change of the liquid storage tank diameter is achieved by changing the flow channel gap reserved during bonding, which has the advantages of strong flexibility, strong driveability, easy implementation, and low cost; the adaptive piston of the present invention can make up for errors in the assembly and production process, reduce the generation of liquid dead volume, enhance the liquid transportation capacity, and react quickly. The present invention uses spring-electromagnetic to block and control microfluids, with good driving effect, sensitive response, strong portability, and good flow blocking effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 : Schematic diagram of the overall structure of the microfluidic control device in Example 1 of the present invention.

[0032] Figure 2 : A detailed schematic diagram of the valve body structure in the microfluidic control device in Example 1 of the present invention.

[0033] Figure 3 : Schematic diagram of the electromagnetic push rod device-metal push rod circular push head in the microfluidic control device in Example 1 of the present invention;

[0034] Figure 4 : Schematic diagram of the structure of the adaptive piston groove in the microfluidic control device in Example 1 of the present invention;

[0035] Figure 5 : Schematic diagram of the adaptive piston structure in the microfluidic control device in Example 1 of the present invention.

[0036] Reference numerals:

[0037] 1: Film backplane

[0038] 2: First Space

[0039] 3: First liquid storage tank

[0040] 4: Lid

[0041] 5: Film

[0042] 6: Runner clearance

[0043] 7: Fixed plate

[0044] 8: Valve body placement space

[0045] 91: first spring;

[0046] 92: second spring;

[0047] 10: Metal Block

[0048] 11: Adaptive piston groove

[0049] 12: Adaptive piston

[0050] 13: Metal push rod round push head

[0051] 14: Metal push rod

[0052] 15: Push rod housing

[0053] 16: Push rod device electromagnetic coil

[0054] 17: Push rod device coil skeleton

[0055] 18: Electromagnet housing

[0056] 19: Electromagnet metal rod

[0057] 20: Electromagnet coil frame

[0058] 21: Electromagnetic coil

[0059] 22: The second space. DETAILED DESCRIPTION

[0060] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0061] Example

[0062] refer to Figure 1-Figure 5 , this embodiment provides a microfluidic control device, including a microfluidic chip, an adaptive liquid driving structure and a spring valve body structure.

[0063] The microfluidic chip is composed of a film back plate 1, a film 5 and a fixed plate 7. The film back plate 1, the film 5 and the fixed plate 7 are arranged in parallel. The film 5 is clamped between the film back plate 1 and the fixed plate 7. The fixed plate 7 is provided with a first space 2, a valve body placement space 8 and a second space 22 that penetrate the upper and lower sides of the fixed plate 7. The valve body placement space 8 is located between the first space 2 and the second space 22. In the first space 2 and the second space 22, the film 5 is not pressed by the fixed plate 7, allowing the film 5 to deform to form a first liquid storage tank 3 and a second liquid storage tank respectively. The film back plate 1 is provided with a A liquid injection port is provided, which is located above the first space 2 and is used to inject liquid into the first liquid storage tank 3. A flow channel gap 6 is formed between the film 5 and the film backplane 1, and the flow channel gap 6 extends from the first liquid storage tank 3 to the second liquid storage tank. The spring valve body structure is arranged in the valve body placement space 8, and is used to control the opening or closing of the flow channel gap 6. The adaptive liquid drive structure is arranged in the first space 2, and is used to provide an extrusion force to the first liquid storage tank 3. When the spring valve body structure is opened, the liquid in the first liquid storage tank 3 is pushed toward the flow channel gap 6 and enters the second liquid storage tank through the flow channel gap 6.

[0064] In this embodiment, the spring valve body structure is composed of a valve body device and an electromagnet. The valve body structure is a normally closed valve body structure. The valve body device is composed of a metal block 10 and a first spring 91. The metal block 10 and the first spring 91 are embedded in the valve body placement space 8 of the fixed plate 7 from the upper side. The outer diameter of the first spring 91 is larger than the lower end outlet of the valve body placement space 8, forming a mechanical restriction, generating a force toward the film 5, forcing the metal block 10 to be pressed tightly against the flow channel gap 6, and the flow channel gap 6 is closed; when the electromagnet is energized, an attraction is generated to overcome the spring force, and the metal block 10 is attracted downward, and the flow channel gap 6 is opened.

[0065] In this embodiment, the metal block 10 is composed of two cylinders with different diameters. The diameter of the large-diameter cylinder is larger than the inner circle diameter of the first spring 91, and the diameter of the small-diameter cylinder is less than or equal to the inner circle diameter of the first spring 91. The small-diameter cylinder fits the first spring 91 and is placed in the valve body placement space 8 from the upper end of the valve body placement space 8.

[0066] In this embodiment, the size of the first spring 91 can be changed according to the required pressure to obtain a larger or smaller valve pressure and achieve the purpose of controlling valves with different flow rates.

[0067] In this embodiment, the electromagnet includes an electromagnet shell 18, an electromagnet metal stick 19, an electromagnet coil frame 20 and an electromagnet electromagnetic coil 21. The electromagnet metal stick 19 is located in the middle of the electromagnet shell 18, the electromagnet coil frame 20 is located on the outside of the electromagnet metal stick 19, the electromagnet electromagnetic coil 21 is wound on the electromagnet coil frame 20, the electromagnet electromagnetic coil 21 is connected to an external power supply, and the electromagnet metal stick 19 is located below the metal block 10. When current passes through the electromagnet electromagnetic coil 21, a magnetic field is generated, and the magnetic field acts on the electromagnet metal stick 19, and the electromagnet metal stick 19 generates an attractive force. The metal block 10 is affected by the attractive force, overcomes the spring force, moves downward, and the flow channel gap 6 is opened, that is, the valve is opened, and the liquid can flow in the flow channel gap 6.

[0068] In this embodiment, the electromagnet housing 18 is fixed on the fixing plate 7 .

[0069] In this embodiment, the adaptive liquid driving structure is composed of an adaptive piston 12 and an electromagnetic push rod device. After the electromagnetic push rod device is powered on, the electromagnetic push rod device pushes the adaptive piston 12 to move, and the bulging first liquid storage tank 3 is squeezed by the adaptive piston 12. When the spring valve body structure is opened, the liquid in the first liquid storage tank 3 is pushed toward the flow channel gap 6 and enters the second liquid storage tank through the flow channel gap 6. When the electromagnetic push rod device acts on the adaptive piston 12, the adaptive piston 12 will be subjected to the force and will adaptively adjust the angle of the adaptive piston 12 according to the angle between the surface of the film 5 and the horizontal plane.

[0070] In this embodiment, the electromagnetic push rod device includes a metal push rod 14, a push rod device housing 15, a push rod device electromagnetic coil 16, and a push rod device coil frame 17. The metal push rod 14 is located in the middle of the push rod device housing 15, and the push rod device coil frame 17 is located on the outside of the metal push rod 14. The push rod device electromagnetic coil 16 is wound on the push rod device coil frame 17. The metal push rod 14 is constrained by the second spring 92 below, and the push rod device electromagnetic coil 16 is connected to an external power supply. The electromagnet metal stick 19 is located below the adaptive piston 12. When current passes through the push rod device electromagnetic coil 16, a magnetic field is generated. The magnetic field acts on the metal push rod 14, and the metal push rod 14 overcomes the spring force and moves upward, pushing the adaptive piston 12 to squeeze the first liquid storage tank 3. When the spring valve body structure is opened, the liquid in the first liquid storage tank 3 is pushed toward the flow channel gap 6, and enters the second liquid storage tank through the flow channel gap 6 to achieve control of the liquid.

[0071] In this embodiment, the size of the adaptive piston 12 is adapted to the size of the first space 2 , and the electromagnetic push rod device pushes the adaptive piston 12 to drive the liquid. The push rod device housing 15 is fixed on the fixing plate 7 .

[0072] In this embodiment, there is an adaptive piston groove 11 on the adaptive piston 12, and a metal push rod circular push head 13 is formed above the metal push rod 14. The metal push rod circular push head 13 is located in the adaptive piston groove 11, and the adaptive piston groove 11 and the metal push rod circular push head 13 are completely matched, and the adaptive piston groove 11 and the metal push rod circular push head 13 constitute an adaptive function. When the electromagnetic push rod device pushes upward, the film 5 and the electromagnetic push rod device generate an extrusion force on the adaptive piston groove 11 and the metal push rod circular push head 13. The adaptive piston groove 11 and the metal push rod circular push head 13 are completely matched and can be rotated in multiple directions. When the film 5 or the adaptive piston 12 is not completely horizontal, the extrusion force will cause the adaptive piston groove 11 and the metal push rod circular push head 13, which are originally in a horizontal state, to deflect the angle to adapt to the angle that may be generated by the contact surface. This design can eliminate assembly errors and processing errors, making liquid discharge more complete.

[0073] In this embodiment, a cover 4 is provided in the liquid injection port, and the cover 4 is used to inject liquid into the film 5 when opened.

[0074] In this embodiment, the fixing plate 7 covers the film 5 to enhance the fixing effect.

[0075] In this embodiment, the fixing plate 7 reserves a flow channel space between the first space 2 and the second space 22 to form a flow channel gap 6 .

[0076] In this embodiment, the film back plate 1 and the film 5 are connected by bonding.

[0077] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A microfluidic control device, characterized in that: It includes a microfluidic chip, an adaptive liquid driving structure and a spring valve body structure. The microfluidic chip is composed of a film back plate (1), a film (5) and a fixed plate (7); the film back plate (1), the film (5) and the fixed plate (7) are arranged in parallel; the film (5) is clamped between the film back plate (1) and the fixed plate (7); the fixed plate (7) is provided with a first space (2) penetrating the upper and lower sides of the fixed plate (7), a valve body placement space (8) and a second space (22); the valve body placement space (8) is located between the first space (2) and the second space (22); At the first space (2) and the second space (22), the film (5) is not pressed by the fixed plate (7), allowing the film (5) to deform to form a first liquid storage bin (3) and a second liquid storage bin respectively. A liquid injection port is provided on the film back plate (1), and the liquid injection port is located above the first space (2) and is used to inject liquid into the first liquid storage bin (3). A flow channel gap (6) is formed between the film (5) and the film back plate (1), and the flow channel gap (6) extends from the first liquid storage bin (3) to the second liquid storage bin. The spring valve body structure is arranged in the valve body placement space (8) and is used to control the opening or closing of the flow channel gap (6). The adaptive liquid driving structure is arranged at the first space (2) and is used to provide a squeezing force to the first liquid storage tank (3). When the spring valve body structure is opened, the liquid in the first liquid storage tank (3) is pushed toward the flow channel gap (6) and enters the second liquid storage tank through the flow channel gap (6); The spring valve body structure is composed of a valve body device and an electromagnet. The valve body structure is a normally closed valve body structure. The valve body device is composed of a metal block (10) and a first spring (91). The metal block (10) and the first spring (91) are embedded in the valve body placement space (8) of the fixed plate (7). The outer diameter of the first spring (91) is larger than the lower end outlet of the valve body placement space (8), forming a mechanical restriction, generating a force toward the film (5), forcing the metal block (10) to be pressed against the flow channel gap (6), and the flow channel gap (6) is closed; when the electromagnet is energized, an attractive force is generated to overcome the spring force, and the metal block (10) is attracted downward, and the flow channel gap (6) is opened; The fixing plate (7) reserves a flow channel space between the first space (2) and the second space (22) for forming a flow channel gap (6).

2. A microfluidic control device according to claim 1, characterized in that: The metal block (10) is composed of two cylinders of different diameters, the diameter of the large-diameter cylinder is larger than the inner diameter of the first spring (91), and the diameter of the small-diameter cylinder is smaller than or equal to the inner diameter of the first spring (91). The small-diameter cylinder fits the first spring (91) and is placed into the valve body placement space (8) from the upper end of the valve body placement space (8).

3. A microfluidic control device according to claim 1, characterized in that: The electromagnet comprises an electromagnet housing (18), an electromagnet metal rod (19), an electromagnet coil frame (20) and an electromagnet electromagnetic coil (21); the electromagnet metal rod (19) is located in the middle of the electromagnet housing (18); the electromagnet coil frame (20) is located outside the electromagnet metal rod (19); the electromagnet electromagnetic coil (21) is wound on the electromagnet coil frame (20); the electromagnet electromagnetic coil (21) is connected to an external power supply; the electromagnet metal rod (19) is located below the metal block (10); when current passes through the electromagnet electromagnetic coil (21), a magnetic field is generated, the magnetic field acts on the electromagnet metal rod (19), the electromagnet metal rod (19) generates an attractive force, the metal block (10) is affected by the attractive force, overcomes the spring force, moves downward, the flow channel gap (6) is opened, and liquid can flow in the flow channel gap (6).

4. A microfluidic control device according to claim 3, characterized in that: The adaptive liquid driving structure is composed of an adaptive piston (12) and an electromagnetic push rod device. When the electromagnetic push rod device is powered on, the electromagnetic push rod device pushes the adaptive piston (12) to move, and the bulging first liquid storage tank (3) is subjected to the squeezing force of the adaptive piston (12).

5. A microfluidic control device according to claim 4, characterized in that: When the electromagnetic push rod device acts on the adaptive piston (12), the adaptive piston (12) will adaptively adjust the angle of the adaptive piston (12) according to the angle between the surface of the film (5) and the horizontal plane after being acted upon by the force.

6. A microfluidic control device according to claim 4, characterized in that: The electromagnetic push rod device comprises a metal push rod (14), a push rod device housing (15), a push rod device electromagnetic coil (16), and a push rod device coil frame (17). The metal push rod (14) is located in the middle of the push rod device housing (15), the push rod device coil frame (17) is located outside the metal push rod (14), the push rod device electromagnetic coil (16) is wound on the push rod device coil frame (17), the metal push rod (14) is constrained by a second spring (92) below, the push rod device electromagnetic coil (16) is connected to an external power supply, and the electromagnet metal rod (19) is located below the adaptive piston (12). When current passes through the push rod device electromagnetic coil (16), a magnetic field is generated, and the magnetic field acts on the metal push rod (14), so that the metal push rod (14) overcomes the spring force and moves upward, pushing the adaptive piston (12) to squeeze the first liquid storage tank (3).

7. A microfluidic control device according to claim 6, characterized in that: An adaptive piston groove (11) is formed on the adaptive piston (12); a metal push rod circular push head (13) is formed above the metal push rod (14); the metal push rod circular push head (13) is located in the adaptive piston groove (11); the adaptive piston groove (11) and the metal push rod circular push head (13) are completely matched; the adaptive piston groove (11) and the metal push rod circular push head (13) constitute an adaptive function.

8. The microfluidic control device according to claim 1, characterized in that: A cover (4) is arranged in the liquid injection port, and when the cover (4) is opened, it is used to inject liquid into the film (5).

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