Micro-fluidic chip for monitoring movement behaviors and physiological characteristics of nematodes
阅读说明:本技术 一种用于线虫运动行为和生理特征监测的微流控芯片 (Micro-fluidic chip for monitoring movement behaviors and physiological characteristics of nematodes ) 是由 朱真 徐星宇 王昊曦 杨剑坤 于 2020-05-29 设计创作,主要内容包括:本发明公开了一种用于线虫运动行为和生理特征监测的微流控芯片,其中:流体入口、培养腔阵列、抽检通道、电阻抗断层成像检测腔、电阻抗谱检测腔以及流体出口依次连接;抽检控制阀,设置于所述抽检通道上,用于控制通道导通或关闭;检测控制阀,设置于电阻抗断层成像检测腔和电阻抗谱检测腔之间,用于控制通道导通或关闭;电阻抗断层成像电极阵列,与电阻抗断层成像检测腔连接;电阻抗谱检测电极阵列,与电阻抗谱检测腔连接。采用上述技术方案,可以实现培养腔、电阻抗断层成像检测腔和电阻抗谱检测腔的集成,实现对线虫的培养、运动行为和生理结构的检测等功能,结合控制阀,可以实现高自动化、高效率的培养、检测。(The invention discloses a micro-fluidic chip for monitoring movement behaviors and physiological characteristics of nematodes, wherein: the fluid inlet, the culture cavity array, the sampling channel, the electrical impedance tomography detection cavity, the electrical impedance spectrum detection cavity and the fluid outlet are sequentially connected; the sampling inspection control valve is arranged on the sampling inspection channel and is used for controlling the channel to be switched on or switched off; the detection control valve is arranged between the electrical impedance tomography detection cavity and the electrical impedance spectrum detection cavity and is used for controlling the channel to be switched on or switched off; the electrical impedance tomography electrode array is connected with the electrical impedance tomography detection cavity; and the electrical impedance spectrum detection electrode array is connected with the electrical impedance spectrum detection cavity. By adopting the technical scheme, the integration of the culture cavity, the electrical impedance tomography detection cavity and the electrical impedance spectroscopy detection cavity can be realized, the functions of culturing the nematodes, detecting the movement behaviors and physiological structures and the like can be realized, and the high-automation and high-efficiency culture and detection can be realized by combining the control valve.)
1. A microfluidic chip for monitoring nematode locomotor activity and physiological characteristics, comprising: base plate, fluid entry, cultivation chamber array, selective examination passageway, selective examination control valve, electrical impedance tomography detect the chamber, electrical impedance tomography electrode array, electrical impedance spectrum detection chamber, electrical impedance spectrum detection electrode array, detect control valve, fluid outlet, wherein:
the substrate is used for bearing the microfluidic chip assembly;
the fluid inlet, the culture cavity array, the sampling channel, the electrical impedance tomography detection cavity, the electrical impedance spectrum detection cavity and the fluid outlet are sequentially connected;
the selective examination control valve is arranged on the selective examination channel and used for controlling the channel to be switched on or off, and nematodes in the corresponding culture cavity flow through the selective examination channel along with the fluid when the channel is switched on;
the detection control valve is arranged between the electrical impedance tomography detection cavity and the electrical impedance spectrum detection cavity and is used for controlling the channel to be switched on or switched off;
the electrical impedance tomography electrode array is connected with the electrical impedance tomography detection cavity; the electrical impedance spectrum detection electrode array is connected with the electrical impedance spectrum detection cavity.
2. The microfluidic chip for nematode locomotor behavior and physiological characteristic monitoring of claim 1, further comprising: wash the entry, wash export and filtration pore, wash entry, wash export and culture chamber array connection, the filtration pore sets up the junction between the culture chamber to be in and wash the entry and wash the passageway between the export on.
3. The microfluidic chip for monitoring locomotor activity and physiological characteristics of nematodes according to claim 2, further comprising a flushing control valve disposed on the channel between the flushing inlet and the flushing outlet for controlling the channel to be opened or closed.
4. The microfluidic chip for monitoring the locomotor behavior and the physiological characteristics of the nematode according to claim 1, wherein the contact part of the electrical impedance tomography detection cavity and the electrode is of a bottleneck-shaped small hole structure.
5. The microfluidic chip for monitoring locomotor activity and physiological characteristics of nematodes according to claim 1, further comprising a side-suction inlet, a side-suction outlet, and connected with said electrical impedance spectroscopy detection chamber.
6. The microfluidic chip for nematode locomotor behavior and physiological characteristic monitoring of claim 5, wherein the electrical impedance spectroscopy detection chamber comprises a porous structure.
7. The microfluidic chip for monitoring locomotor activity and physiological characteristics of nematodes according to claim 6, further comprising a side-suction control valve disposed on the channel between the side-suction inlet and the side-suction outlet for controlling the channel to be turned on or off.
8. The microfluidic chip for monitoring the locomotor behavior and the physiological characteristics of the nematode according to claim 3 or 7, wherein the control valve comprises a cavity and a gas inlet, and a thin film is correspondingly arranged on a channel connected with the cavity.
9. The microfluidic chip for monitoring locomotor activity and physiological characteristics of nematodes according to claim 1, wherein the channel gradually shrinks from the cavity for detection of electrical impedance spectroscopy to the fluid outlet.
Technical Field
The invention relates to the field of microfluidic chips, in particular to a microfluidic chip for monitoring movement behaviors and physiological characteristics of nematodes.
Background
Microfluidic chips (Microfluidics chips) are a leading-edge technology for realizing fluid manipulation by manufacturing submicron microchannels and chamber networks through micromachining processes, and integrate operations in traditional biochemical analysis laboratories on tiny chips. The intersection of microfluidic chip technology and various subjects such as hydrodynamics, electromagnetism, acoustics, optics and the like is widely applied to research in the fields of biology and chemistry at present. Nematodes are a common model organism in biological research
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a micro-fluidic chip for monitoring the movement behavior and physiological characteristics of nematodes.
The technical scheme is as follows: the embodiment of the invention provides a micro-fluidic chip for monitoring the movement behavior and physiological characteristics of nematodes, which comprises: base plate, fluid entry, cultivation chamber array, selective examination passageway, selective examination control valve, electrical impedance tomography detect the chamber, electrical impedance tomography electrode array, electrical impedance spectrum detection chamber, electrical impedance spectrum detection electrode array, detect control valve, fluid outlet, wherein:
the substrate is used for bearing the microfluidic chip assembly;
the fluid inlet, the culture cavity array, the sampling channel, the electrical impedance tomography detection cavity, the electrical impedance spectrum detection cavity and the fluid outlet are sequentially connected;
the selective examination control valve is arranged on the selective examination channel and used for controlling the channel to be switched on or off, and nematodes in the corresponding culture cavity flow through the selective examination channel along with the fluid when the channel is switched on;
the detection control valve is arranged between the electrical impedance tomography detection cavity and the electrical impedance spectrum detection cavity and is used for controlling the channel to be switched on or switched off;
the electrical impedance tomography electrode array is connected with the electrical impedance tomography detection cavity; the electrical impedance spectrum detection electrode array is connected with the electrical impedance spectrum detection cavity.
Specifically, still include: wash the entry, wash export and filtration pore, wash entry, wash export and culture chamber array connection, the filtration pore sets up the junction between the culture chamber to be in and wash the entry and wash the passageway between the export on.
The flushing control valve is arranged on a channel between the flushing inlet and the flushing outlet and used for controlling the channel to be communicated or closed.
Specifically, the contact part of the electrical impedance tomography detection cavity and the electrode is of a bottleneck-shaped small hole structure.
Specifically, the device also comprises a side suction inlet and a side suction outlet which are connected with the electrical impedance spectrum detection cavity.
Specifically, the electrical impedance spectroscopy detection cavity comprises a porous structure.
The side suction passage control valve is arranged on a passage between the side suction inlet and the side suction outlet and used for controlling the passage to be communicated or closed.
Specifically, the control valve comprises a cavity and a gas inlet, and a membrane is arranged corresponding to a channel connected with the cavity.
Specifically, the channel gradually shrinks from the electric impedance spectroscopy detection cavity to the fluid outlet.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages: the integrated culture cavity, the electrical impedance tomography detection cavity and the electrical impedance spectroscopy detection cavity realize the functions of culturing the nematodes, detecting the movement behaviors and physiological structures and the like, and can realize the automatic and efficient culture and detection by combining a control valve.
Drawings
Fig. 1 is a schematic structural diagram of a microfluidic chip provided in an embodiment of the present invention;
FIG. 2 is a schematic plan view of a fluid channel provided in an embodiment of the present invention;
FIG. 3 is a schematic plan view of an electrical impedance tomography detection region provided in an embodiment of the present invention;
FIG. 4 is a schematic plan view of an electrical impedance spectroscopy detection region provided in an embodiment of the present invention
FIG. 5 is a schematic structural diagram of a control valve provided in an embodiment of the present invention;
1-fluid inlet, 2-culture chamber array, 3-sampling inspection channel, 4-sampling inspection control valve, 5-electrical impedance tomography detection chamber, 6-electrical impedance tomography electrode array, 7-bottleneck-shaped small hole structure, 8-detection control valve, 9-electrical impedance spectroscopy detection chamber, 10-electrical impedance spectroscopy detection electrode array, 11-fluid outlet, 12-flushing inlet, 13-flushing outlet, 14-filtering hole, 15-flushing control valve, 16-side suction inlet, 17-side suction outlet, 18-hole structure, 19-side suction control valve, 20-contraction channel, 21-gas inlet, 22-cavity and 23-film.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
Fig. 1 and fig. 2 are schematic structural diagrams of a microfluidic chip and schematic plan views of a fluid channel according to an embodiment of the present invention.
The embodiment of the invention provides a micro-fluidic chip for nematode detection, which comprises: base plate, fluid entry 1, culture chamber array 2, selective examination passageway 3, selective examination control valve 4, electrical impedance tomography detects chamber 5, electrical impedance tomography electrode array 6, electrical impedance
the substrate is used for bearing the microfluidic chip assembly;
the fluid inlet 1, the culture cavity array 2, the sampling channel 3, the electrical impedance tomography detection cavity 5, the electrical impedance
the selective examination control valve 4 is arranged on the selective examination channel 3 and is used for controlling the channel to be switched on or off, and nematodes in the corresponding culture cavity flow through the selective examination channel 3 along with fluid when the channel is switched on;
the
the electrical impedance tomography electrode array 6 is connected with the electrical impedance tomography detection cavity 5; the electrical impedance spectrum
In the specific implementation, an electrode array layer is arranged on the substrate, and then a fluid channel layer is arranged above the substrate, and the substrate is used for bearing components such as a fluid channel (the fluid channel refers to a channel through which fluid passes, a culture chamber, a detection chamber and the like) such as a fluid inlet 1, a
In a specific implementation, the fluid inlet 1 may be used for inputting a fluid such as a culture solution, a suspension, etc., and discharging the fluid from the
In specific implementation, the culture cavity array 2 may include a plurality of culture cavities, each culture cavity corresponds to a sampling inspection channel 3, and the plurality of sampling inspection channels 3 may be converged into one channel to be connected with the electrical impedance tomography detection cavity 5, or may be directly connected with the electrical impedance tomography detection cavity 5. And each sampling inspection channel 3 is provided with a sampling inspection control valve 4, and when the sampling inspection channel 3 is controlled to be communicated, the nematodes in the culture cavity corresponding to the sampling inspection channel 3 flow through the sampling inspection channel 3 along with the fluid and enter the electrical impedance tomography imaging detection cavity 5. Through setting up a plurality of culture chambers and selective examination control valve 4, can realize the control experiment of a plurality of nematodes to and cultivate, catch etc. accurate controlling.
In specific implementation, the
In an implementation, referring to fig. 3 and 4, the electrodes are connected to the detection chamber, i.e. the electrodes are in direct contact with the fluid in the fluid channel.
In the specific implementation, the nematode can be caenorhabditis elegans, which is a common model organism in biological research, and by virtue of the characteristics of known whole gene sequence, clear genetic background, short growth cycle and simple individual structure, the caenorhabditis elegans is widely applied to the research of biological neurology, genetics, motor behavior, pharmaceutical research and test and stress response. The existing experiment results show that the change of the movement behavior and the physiological characteristic structure of the nematode has obvious correlation with the activity, the aging and the life of the nervous system of the nematode, for example, the movement behavior of the nematode becomes slow in the aging process, the internal organs such as gonads and the like are gradually enlarged, and the epidermal muscle tissue is gradually degenerated. The micro-fluidic chip structure is combined to have the advantages of customization and diversification, the size of the nematode can be improved and optimized, and PDMS, PMMA and other materials with air permeability, light transmittance and biological harmlessness are adopted, so that the long-term culture, capture, fixation and other accurate control of the nematode can be realized.
In the specific implementation, Electrical Impedance Tomography (EIT) detection applies an excitation signal to a target (nematode) to be detected, fits Electrical impedance detection data and non-uniform medium distribution in an electric field, reduces the internal structure and tissue distribution of the target by combining an EIT image reconstruction algorithm and a deep learning algorithm, and can detect and obtain kinematic behavior parameters such as movement rate, body curvature, swing amplitude, frequency and the like of the nematode; the combination of Electrical Impedance Spectroscopy (EIS) detection and a microfluidic chip, the integration of a submicron electrode in the chip realizes the non-invasive nondestructive detection of a biological sample (nematode), the sweep frequency Electrical impedance detection signal with wide frequency band and small amplitude can obtain the characteristics of the biological sample such as shape, volume, internal dielectric parameters and the like according to the difference of the characteristic frequency of biological tissues, and the physiological structure characteristics of the nematode such as pseudocoelomic epidermic muscle, internal organs and the like can be detected.
In the embodiment of the invention, the contact part of the electrical impedance tomography electrode array 6 and the electrical impedance tomography detection cavity 5 is the bottleneck-shaped small hole structure 7, so that the detection plane electrode can be equivalent to a point electrode, the influence of a flat electrode on image reconstruction can be reduced, and the imaging resolution is improved.
In an embodiment of the present invention, the microfluidic chip further includes: a flushing inlet 12, a flushing
In the specific implementation, the flushing inlet 12 is used for inputting flushing liquid, and after the flushing liquid passes through all the culture chambers in the culture chamber array 2, the flushing liquid takes away waste such as worm eggs and is discharged from the flushing
In the embodiment of the present invention, the microfluidic chip further includes a
In one embodiment, the
In the embodiment of the invention, the microfluidic chip further comprises a
In the embodiment of the invention, the electrical impedance
In the embodiment of the present invention, the microfluidic chip further includes a side
In the specific implementation, the fluid enters the electrical impedance
Fig. 5 is a schematic structural diagram of a control valve according to an embodiment of the present invention.
In the embodiment of the present invention, the control valve includes a cavity 22 and a gas inlet 21, and a membrane 23 is disposed corresponding to a channel connected to the cavity 22.
In specific implementation, the control valve includes a sampling control valve 4, a
In the embodiment of the invention, the
In the specific implementation, the
In a specific embodiment, all control valves are in a closed channel state after the nematodes are loaded into the culture chamber. The sampling control valve 4 controls the conduction of a corresponding extraction channel of a culture cavity in which nematodes to be detected are located at intervals of preset time, the nematodes are loaded into the electrical impedance tomography detection cavity 5, the electrical impedance tomography electrode array 6 carries out sampling detection, the
In specific implementation, the number, shape and size of the fluid channels and culture chambers, and the shape, size and layout of the electrode array can be designed and prepared according to actual requirements.
In the specific implementation, the integrated culture chamber, the electrical impedance tomography detection chamber 5 and the electrical impedance