Microfluidic assisted fluidic extrusion photonic crystal fiber preparation device based on piezoelectric regulation

Abstract

The application discloses a kind of based on piezoelectric regulation and control microfluidic auxiliary fluid extrusion photonic crystal optical fiber preparation device, injection pump controls and pushes the injector containing fluid to the fluid inlet of multichannel microfluidic chip;Piezoelectric microvalve is arranged at the fluid outlet of each path of multichannel microfluidic chip, and piezoelectric microvalve controller controls the energization condition of each piezoelectric microvalve;Extruder front end is fixed with extruder head, coaxially installs screw in inside, and the rear end motor output shaft is coaxially fixed with screw, and near rear end, barrel is arranged and communicated with internal cavity, and heater is arranged on outer periphery;Splitting shuttle is coaxially arranged in extruder head, and hollow microneedle is embedded in splitting shuttle and extends at both ends, input end is communicated with fluid outlet, and output end is stretched out and arranged axially parallel with splitting shuttle;Solidification device is arranged at the output end of extruder head, and is used for solidifying photonic crystal optical fiber.The application realizes the one-step integrated manufacturing of the forming and selective filling of photonic crystal optical fiber.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical fibers and communication, sensing, chemistry and the like, and particularly relates to a microfluidic assisted fluid extrusion photonic crystal fiber preparation device based on piezoelectric regulation. BACKGROUND

[0002] The photonic crystal fiber is an optical fiber with regular microchannel distribution in the cross section, which has wide application in the fields of communication, medical engineering, chemical analysis, environmental detection and laser system. In order to realize the preparation of photonic crystal fiber, the main method currently adopted is to form a fiber preform rod by stacking capillary tubes, and then to draw the photonic crystal fiber by heating and drawing in a drawing tower. However, the current production scheme is complicated, needs two-step processing, is not conducive to large-scale production and application of photonic crystal fiber, and the position and size of microchannels are difficult to adjust flexibly.

[0003] In view of the above problems, 3D printing method, drilling method, in-mold forming method and extrusion method are used to realize the production of plastic photonic crystal fiber preform rod. Among them, the extrusion method is mainly used for the production of plastic photonic crystal fiber, which has the advantages of continuous production, high efficiency and low cost. It is also reported that the extrusion method can realize single-step extrusion processing of photonic crystal fiber without preform-drawing two-step production.

[0004] In order to enhance the performance of photonic crystal fiber and expand the application of photonic crystal fiber, it is necessary to selectively fill the microchannels of photonic crystal fiber. The current selective filling methods mainly include fusion method, glue sealing method and mechanical processing side hole method. However, these methods have the disadvantages of complicated steps, certain limitations in microchannel selection, fiber material loss and the like, and cannot be integrated with the production and processing process of photonic crystal fiber to realize one-step forming of selectively filled photonic crystal fiber.

[0005] Therefore, a manufacturing method and device capable of realizing the integration of photonic crystal fiber preparation and selective filling are still to be developed. SUMMARY

[0006] In view of the shortcomings of the prior art, the present application provides a microfluidic assisted fluid extrusion photonic crystal fiber preparation device based on piezoelectric regulation. The multi-channel microfluidic chip controlled by the piezoelectric micro valve array realizes independent channel regulation of multi-channel fluid medium flow. The extruder core module with dense array of hollow metal microneedles realizes the extrusion forming processing of photonic crystal fiber assisted by fluid medium.

[0007] The specific technical solutions are as follows:

[0008] A microfluidic auxiliary fluid extrusion photonic crystal fiber preparation device based on piezoelectric regulation, comprising: an injection pump, a syringe, a fluid delivery pipeline, a motor, a barrel, a heater, a screw, an extruder head, a multi-channel microfluidic chip, a piezoelectric microvalve, and a piezoelectric microvalve controller.

[0009] The output shaft of the injection pump is connected with the piston rod of the syringe, and a fluid is installed in the syringe; one end of the fluid delivery pipeline is in communication with the output end of the syringe, and the other end is in communication with the fluid inlet of the multi-channel microfluidic chip; the multi-channel microfluidic chip is a tree-shaped microfluid channel structure, which divides the fluid into multiple microfluid channels, and each microfluid channel is provided with a piezoelectric microvalve near the fluid outlet; the piezoelectric microvalve controller is used to control the energization of each piezoelectric microvalve, thereby controlling the deformation degree of the piezoelectric microvalve and adjusting the flow of the microfluid channel.

[0010] The extruder is a hollow shell, the front end of which is coaxially and fixedly connected with the extruder head, the rear end of which is coaxially installed with a motor, and the inside of which is coaxially installed with a screw that can rotate around the shaft, and the output shaft of the motor is coaxially and fixedly connected with the screw; a barrel for feeding is arranged near the rear end of the extruder and communicates with the internal cavity, and a heater is arranged on the outer periphery of the extruder.

[0011] The inside of the extruder head is provided with a flow dividing shuttle and a hollow microneedle, and the flow dividing shuttle is coaxially arranged with the extruder head; the hollow microneedle is embedded in the flow dividing shuttle and extends out of the flow dividing shuttle at both ends, the input end of the hollow microneedle is in communication with the fluid outlet of the multi-channel microfluidic chip through another fluid delivery pipeline, the output end of the hollow microneedle extends forward and is arranged axially parallel to the flow dividing shuttle, and the output ends of multiple hollow microneedles are located on different planes.

[0012] The output end of the extruder head is provided with a curing device for curing the preliminary formed photonic crystal fiber output by the extruder head, so as to obtain a photonic crystal fiber with multiple microchannels in the inside and selectively filled with fluid medium.

[0013] Further, the curing device comprises a cooling water tank, a crosslinking device, and a roller; the cooling water tank is arranged at the output end of the extruder head and contains cooling liquid; the crosslinking device is arranged above the cooling water tank, and the roller is used to convey the preliminary formed photonic crystal fiber into the cooling water tank and convey the finally formed photonic crystal fiber out.

[0014] Further, in the multi-channel microfluidic chip, the microfluid channel is provided with n levels of bifurcations, each level of bifurcation divides the fluid into two paths, and finally divides the fluid into 2 n path microfluid channels and corresponds to 2 n fluid outlets.

[0015] Further, the microstructure side of the multi-channel microfluidic chip adopts polydimethylsiloxane, and the microchannel is sealed with a glass slide.

[0016] Further, the multi-channel microfluidic chip has multiple parallel, according to the requirement, each multi-channel microfluidic chip outputs different fluid or air, the number of hollow microneedles is same as the number of fluid outlet of all multi-channel microfluidic chips.

[0017] Further, the output end of the hollow microneedle is in parabolic distribution, and the output end of the hollow microneedle located at the axis of the distribution shuttle is located at the front.

[0018] Further, the heater has multiple groups, each group sets different heating temperature, and is arranged in sections on the outer periphery of the extruder.

[0019] A microfluidic auxiliary fluid extrusion photonic crystal fiber preparation method based on piezoelectric regulation is realized according to the microfluidic auxiliary fluid extrusion photonic crystal fiber preparation device based on piezoelectric regulation, and the method comprises the following operations:

[0020] The plastic particle material is put into the extruder through the barrel, the motor drives the screw to rotate axially, so as to convey and extrude the plastic particle material to the front, and in this process, the plastic particle material is melted by the heater to obtain a plastic melt;

[0021] At the same time, the injection pump is started, the syringe is pushed by the injection pump, the fluid is conveyed to the fluid inlet of the multi-channel microfluidic chip through the fluid conveying pipeline, the fluid is distributed into multiple microchannels through the multi-channel microfluidic chip, and each microchannel is controlled by the piezoelectric microvalve controller, so as to control the fluid output flow of each microchannel; the fluid output by the fluid outlet is conveyed into the hollow microneedle through the fluid conveying pipeline;

[0022] The plastic melt is separated by the distribution shuttle and reassembled at the front end of the distribution shuttle, and the fluid is extruded through the hollow microneedle, so that the microchannel in the plastic melt is formed under the action of the fluid, and a preliminarily formed photonic crystal fiber is obtained.

[0023] The plastic melt containing the microchannel is solidified by the solidification device, and the plastic melt is solidified and formed, and the fluid medium filled in the internal microchannel is solidified and formed, so that the photonic crystal fiber with multiple microchannels and selectively filled with fluid medium is obtained.

[0024] The beneficial effects of the present application are:

[0025] (1) The multi-channel microfluidic chip controlled by the piezoelectric microvalve array is adopted, multi-channel fluid distribution is realized, the independent and accurate regulation of the fluid flow of each channel can be realized through the piezoelectric microvalve controller, the control of a large number of injection pumps arranged in parallel is avoided, and the system design and operation are simplified.

[0026] (2) The application adopts fluid-assisted extrusion to process photonic crystal fiber, realizes one-step integrated manufacturing of photonic crystal fiber forming and selective filling, shortens the manufacturing process of photonic crystal fiber, greatly reduces the manufacturing cost of photonic crystal fiber, and can arbitrarily specify the photonic crystal fiber microchannels to be filled with fluid medium. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of a microfluidic auxiliary fluid extrusion photonic crystal fiber preparation device based on piezoelectric regulation in an embodiment of the application.

[0028] Figure 2 is a structural schematic diagram of a multi-channel microfluidic chip, wherein (a) is a top view of the multi-channel microfluidic chip, (b) is an A-A sectional view of the multi-channel microfluidic chip and a local enlarged view of a single microchannel.

[0029] Figure 3 is a structural schematic diagram of an extruder core die in an extruder head in an embodiment of the application, wherein (a) is a front view, (b) is a sectional view, and (c) is a right view.

[0030] In the figure, the injection pump 1, the syringe 2, the fluid delivery pipeline 3, the motor 4, the barrel 5, the heater 6, the screw 7, the extruder head 8, the shunt shuttle 8-1, the hollow microneedle 8-2, the cooling water tank 9, the crosslinking device 10, the roller 11, the piezoelectric microvalve 12, the multi-channel microfluidic chip 13, the fluid inlet 13-1, the fluid outlet 13-2, and the piezoelectric microvalve controller 14. DETAILED DESCRIPTION

[0031] The purpose and effect of the application will become more apparent from the following detailed description of the application in conjunction with the preferred embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the application and are not used to limit the application.

[0032] As shown in Figure 1 , a microfluidic auxiliary fluid extrusion photonic crystal fiber preparation device based on piezoelectric regulation comprises a plastic extrusion processing assembly and a fluid distribution and delivery assembly.

[0033] The fluid distribution and delivery assembly includes a syringe pump 1, a syringe 2, a fluid delivery pipeline 3, a multi-channel microfluidic chip 13, a piezoelectric microvalve 12, and a piezoelectric microvalve controller 14. The piston rod of syringe 2 is coaxially connected to the output shaft of syringe pump 1, and the fluid is contained within syringe 2. One end of one fluid delivery pipeline 3 is connected to the output end of syringe 2 and the other end is connected to the fluid inlet 13-1 of the multi-channel microfluidic chip 13. Another fluid delivery pipeline 3 is connected to the fluid outlet 13-2 of the multi-channel microfluidic chip 13 and the other end is connected to the plastic extrusion processing assembly.

[0034] like Figure 2 As shown, the multi-channel microfluidic chip 13 adopts a tree-shaped microfluidic structure design. The microchannel (i.e., fluid channel) is provided with n-level bifurcations. Each level of bifurcation divides the fluid into two paths. The microchannel port that is not bifurcated serves as the fluid inlet 13-1 of the multi-channel microfluidic chip 13, and the ends of each microchannel of the last level serve as the fluid outlet 13-2 of the multi-channel microfluidic chip 13; finally, the fluid is divided into two paths. n Road, and with 2 n Each fluid outlet 8-2 corresponds to a corresponding fluid outlet 8-2. A piezoelectric microvalve 12 is fixed above the position of the last-stage microchannel near the fluid outlet 8-2. Each piezoelectric microvalve 12 is electrically connected to a piezoelectric microvalve controller 14. The piezoelectric microvalve controller 14 can individually control the energization of the piezoelectric microvalve 12, thereby controlling the degree of deformation of the piezoelectric microvalve 12 and thus the fluid flow rate within the corresponding microchannel. In this embodiment, during actual operation, when different voltages are applied to the piezoelectric microvalve 12 in the corresponding microchannel by the piezoelectric microvalve controller 14, the piezoelectric microvalve 12 undergoes different degrees of deformation, reducing the microchannel cross-section, thereby increasing the flow resistance of the specified microchannel, and thus changing the fluid flow rate of the specified microchannel. Since each piezoelectric microvalve 12 can be individually controlled, independent regulation of fluid flow distribution in multiple microchannels can be achieved. In order to achieve effective control of the deformation of the multi-channel microfluidic chip 13 by the piezoelectric microvalve 12, in this embodiment, PDMS (polydimethylsiloxane) is used to prepare the microstructure side of the multi-channel microfluidic chip 13, and a glass slide is used to seal the microchannel.

[0035] like Figure 1As shown, the plastic extrusion processing assembly includes: motor 4, barrel 5, heater 6, screw 7, extruder head 8, cooling water tank 9, crosslinking device 10, roller 11. The screw 7 is coaxially installed in the extruder, and can rotate around the shaft. The forward direction of the screw 7 when rotating to push the object filled in the extruder is referred to as the front. The motor 4 is arranged at the rear of the extruder, and the output shaft thereof is coaxially fixedly connected with the screw 7. The barrel 5 is arranged on the upper rear part of the extruder and communicates with the internal cavity, and is used for filling plastic particle materials. The heater 6 is arranged on the outer periphery of the extruder, and is used for heating and melting the plastic particle materials; according to actual needs, the heaters 6 of different heating temperatures can be arranged in sections on the outer periphery of the extruder, so that the heating temperature changes in the axial direction.

[0036] The extruder head 8 is fixedly connected to the front end of the extruder, and the extruder core die is arranged in the interior of the extruder head 8. As shown in the figure, Figure 3 The extruder core die includes a flow distribution shuttle 8-1 and hollow microneedles 8-2. The flow distribution shuttle 8-1 is coaxially arranged with the extruder, and the hollow microneedles 8-2 are integrally embedded in the interior of the flow distribution shuttle 8-1, and the number of the hollow microneedles 8-2 is the same as that of the fluid outlets 13-2 of the multi-channel microfluidic chip 13. The input end of the hollow microneedle 8-2 communicates with the fluid outlet 13-2 through the fluid conveying pipeline 3, the output end of the hollow microneedle 8-2 protrudes out of the flow distribution shuttle 8-1 and is arranged in axial parallel with the flow distribution shuttle 8-1 and points to the front, and the plastic melt is internally formed into a microchannel array under the action of the fluid output in the hollow microneedle 8-2. Finally, the output end of the extruder head 8 outputs the plastic melt containing the microchannels (i.e. the preliminarily formed photonic crystal fiber). In the design of the photonic crystal fiber, it is required that the microchannel array is densely arranged, and therefore, in order to realize the optimization of the plastic melt flow and prevent the occurrence of the gap defects of the melt in the center of the plastic melt, the ends of the hollow microneedles 8-2 are not arranged on the same plane; in this embodiment, the ends of the hollow microneedles 8-2 are distributed according to a parabola.

[0037] The output end of the extruder head 8 is provided with the cooling water tank 9, which contains cooling liquid. The crosslinking device 10 is arranged above the cooling water tank 9. The roller 11 is arranged in the cooling water tank 9 and outside the cooling water tank 9, and is used for conveying the preliminarily formed photonic crystal fiber to the front, and since the preliminarily formed photonic crystal fiber is still in the melt state, the roller 11 simultaneously plays a certain stretching role, so that the preliminarily formed photonic crystal fiber is further thinned, and is conveyed into the cooling water tank 9 to be solidified and formed into the final photonic crystal fiber.

[0038] Further, by arranging a plurality of parallel multi-channel microfluidic chips 13 in the fluid distribution and conveying assembly, different fluid media can be filled in different microchannels of the photonic crystal fiber at the same time.

[0039] According to the microfluidic auxiliary fluid extrusion photonic crystal fiber preparation device based on piezoelectric regulation, the embodiment further provides a microfluidic auxiliary fluid extrusion photonic crystal fiber preparation method based on piezoelectric regulation, and specifically includes the following operations:

[0040] The plastic particle material is put into the extruder through the barrel 5, the motor 4 drives the screw 7 to rotate axially, so as to convey and extrude the plastic particle material forward, and the plastic particle material is melted by the heater 6 in the process, so that the plastic melt is obtained.

[0041] At the same time, the injection pump 1 is started, the syringe 2 is pushed by the injection pump 1, and the fluid is conveyed to the fluid inlet 13-1 of the multi-channel microfluidic chip 13 through the fluid conveying pipeline 3; the fluid is distributed into multiple micro-channel fluids through the multi-channel microfluidic chip 13; each micro-channel fluid is conveyed into the hollow microneedle 8-2 through the fluid outlet 13-2 and the fluid conveying pipeline 3. Since the piezoelectric microvalve controller 14 can control each piezoelectric microvalve 12 individually, independent regulation of each micro-channel switch can be realized: for the photonic crystal fiber micro-channel that needs to be filled with fluid medium, the piezoelectric microvalve controller 14 controls the flow of the corresponding micro-channel; if different fluid media need to be filled, different multi-channel microfluidic chips 13 are used correspondingly; for the photonic crystal fiber micro-channel that does not need to be filled with fluid medium, the input end of the hollow microneedle 8-2 is in communication with a new multi-channel microfluidic chip 13, and the multi-channel microfluidic chip 13 does not pass in fluid, but only passes in air.

[0042] The plastic melt forms the internal micro-channel array under the action of the fluid output in the hollow microneedle 8-2 in the extruder head 8, and finally the output end of the extruder head 8 outputs the preliminarily formed photonic crystal fiber. Specifically, the plastic melt is separated by the flow dividing shuttle 8-1 and then re-converged, and the fluid medium is extruded through the hollow microneedle 8-2, so as to realize the formation of the micro-channel in the plastic melt.

[0043] Under the driving of the roller 11, the preliminarily formed photonic crystal fiber passes through the cooling water tank 9 and the crosslinking device 10, the cooling liquid in the cooling water tank 9 solidifies the plastic melt, and the crosslinking device 10 solidifies the fluid medium filled in the internal micro-channel, so that the photonic crystal fiber with multiple internal micro-channels and selectively filled with fluid medium is finally obtained.

[0044] The application is specifically illustrated by the following examples.

[0045] Example 1

[0046] In this embodiment, the fluid medium is selected as an acrylamide solution (10% by mass) and its cross-linking agent (N,N'-methylene bisacrylamide, 1% by mass) and initiator (1% by mass), and the plastic particle material is selected as PMMA (polymethyl methacrylate) with good optical performance. The multi-channel microfluidic chip 13 is a tree-shaped microchannel structure with 5 levels of bifurcations, and is divided into 32 fluid channels. The flow distribution of each fluid channel is controlled by the piezoelectric microvalve 12. After the PMMA enters the feeding cylinder 5, the temperature of the feeding port is set to 70°C, and the temperatures of the three sections (in order from back to front) of the screw 7 are 180°C, 200°C and 230°C, respectively. The compression ratio of the screw 7 is 2.2. The photonic crystal fiber containing acrylamide in the internal microchannel is formed through the core die of the extruder, and is solidified by the cooling water tank 9 under the traction of the roller 11. At the same time, the acrylamide, cross-linking agent and initiator in the microchannel are irradiated by the ultraviolet lamp (i.e. cross-linking device 10) above the cooling water tank 9, so that the acrylamide is cross-linked and solidified into a polyacrylamide hydrogel. Thus, a hydrogel / plastic composite photonic crystal fiber is prepared.

[0047] Those skilled in the art can understand that the above description is only preferred examples of the application and is not intended to limit the application. Although the application has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent replacements for some of the technical features. Any modifications, equivalent replacements, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A piezoelectrically controlled microfluidic-assisted fluid extrusion device for preparing photonic crystal fibers, characterized in that: include: Syringe pump, syringe, fluid delivery pipeline, motor, barrel, heater, screw, extruder head, multi-channel microfluidic chip, piezoelectric microvalve, piezoelectric microvalve controller; The output shaft of the syringe pump is connected to the piston rod of the syringe, and the fluid is installed in the syringe; one end of the fluid delivery pipeline is connected to the output end of the syringe, and the other end is connected to the fluid inlet of the multi-channel microfluidic chip; the multi-channel microfluidic chip has a tree-shaped microchannel structure, which divides the fluid into multiple microchannel outputs, and each microchannel is provided with a piezoelectric microvalve near the fluid outlet. The piezoelectric microvalve controller is used to control the power supply of each piezoelectric microvalve, thereby controlling the deformation degree of the piezoelectric microvalve and adjusting the flow rate of the microchannel; The extruder is a hollow shell, the front end of which is coaxially connected to the extruder head, the rear end of which is coaxially mounted with a motor, and a screw that can rotate around the axis is coaxially mounted inside, and the output shaft of the motor is coaxially connected to the screw; a barrel for feeding is arranged near the rear end of the extruder and is connected to the internal cavity, and a heater is arranged on the periphery of the extruder; A diverter shuttle and hollow microneedles are disposed inside the extruder die head, the diverter shuttle being coaxially arranged with the extruder die head; the hollow microneedles are embedded in the diverter shuttle and extend from both ends of the diverter shuttle; the input end of the hollow microneedle is connected to the fluid outlet of the multi-channel microfluidic chip through another fluid delivery pipeline, and the output end extends forward and is arranged parallel to the axial direction of the diverter shuttle, and the output ends of the multiple hollow microneedles are located on different planes; The output end of the extruder head is provided with a curing device for curing the preliminarily formed photonic crystal fiber outputted from the extruder head to obtain a photonic crystal fiber having a plurality of microchannels inside and selectively filled with a fluid medium; The multi-channel microfluidic chip has multiple parallel operations. Each multi-channel microfluidic chip outputs different fluids or air according to needs. The number of the hollow microneedles is the same as the number of fluid outlets of all multi-channel microfluidic chips.

2. The device for preparing photonic crystal fiber by microfluidic-assisted fluid extrusion based on piezoelectric control according to claim 1, characterized in that: The curing device includes: a cooling water tank, a cross-linking device, and a roller; the cooling water tank is arranged at the output end of the extruder head and contains coolant; the cross-linking device is arranged above the cooling water tank, and the roller is used to transport the initially formed photonic crystal fiber into the cooling water tank and transport the finally formed photonic crystal fiber out.

3. The device for preparing photonic crystal fiber by microfluidic-assisted fluid extrusion based on piezoelectric control according to claim 1, characterized in that: In the multi-channel microfluidic chip, the microchannel is provided with n-level bifurcations, each level of bifurcations divides the fluid into two paths, and finally the fluid is divided into two n microfluidic channel, and with 2 n Corresponding fluid outlets.

4. The device for preparing photonic crystal fiber by microfluidic-assisted fluid extrusion based on piezoelectric control according to claim 1, characterized in that: The microstructure side of the multi-channel microfluidic chip is made of polydimethylsiloxane, and the microchannels are sealed with a glass slide.

5. The device for preparing photonic crystal fiber by microfluidic-assisted fluid extrusion based on piezoelectric control according to claim 1, characterized in that: The output ends of the hollow microneedles are distributed in a parabolic pattern, and the output end of the hollow microneedle located at the axis of the diversion shuttle is located at the front.

6. The device for preparing photonic crystal fiber by microfluidic-assisted fluid extrusion based on piezoelectric control according to claim 1, characterized in that: The heaters are arranged in multiple groups, each group is set with a different heating temperature, and are arranged in sections on the periphery of the extruder.

7. A method for preparing a photonic crystal fiber by microfluidic-assisted fluid extrusion based on piezoelectric control, which is implemented by the device for preparing a photonic crystal fiber by microfluidic-assisted fluid extrusion based on piezoelectric control according to any one of claims 1 to 6, characterized in that: The following operations are included: Plastic granules are fed into the extruder through the barrel, and the motor drives the screw to rotate axially, thereby conveying and extruding the plastic granules forward. During this process, the heater heats and melts the plastic granules to obtain a plastic melt. At the same time, the syringe pump is started, which pushes the syringe to deliver the fluid to the fluid inlet of the multi-channel microfluidic chip through the fluid delivery pipeline; the fluid is distributed into multiple microchannel fluids through the multi-channel microfluidic chip, and the piezoelectric microvalve controller controls each piezoelectric microvalve to control the fluid output flow rate of each microchannel; the fluid output from the fluid outlet is delivered to the hollow microneedle through the fluid delivery pipeline; The plastic melt is separated by the diverter shuttle and then reunited at the front end of the diverter shuttle. The fluid is extruded through the hollow microneedle, and microchannels are formed in the plastic melt under the action of the fluid to obtain a preliminarily formed photonic crystal fiber. The plastic melt containing microchannels passes through a solidification device to solidify the plastic melt and the fluid medium filled in the internal microchannels to obtain a photonic crystal fiber with multiple microchannels and selectively filled with fluid medium.

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