摘要:
Microfluidic devices and methods that use cells such as cancer cells, stem cells, blood cells for preprocessing, sorting for various biodiagnostics or therapeutical applications are described. Microfluidics electrical sensing such as measurement of field potential or current and phenomena such as immiscible fluidics, inertial fluidics are used as the basis for cell and molecular processing (e.g., characterizing, sorting, isolation, processing, amplification.) of different particles, chemical compositions or biospecies (e.g., different cells, cells containing different substances, different particles, different biochemical compositions, proteins, enzymes etc.). Specifically, the present invention discloses a number of sorting schemes for stem cells, whole blood and circulating tumor cells, and extracting serum from whole blood.
摘要:
Described herein are particular embodiments relating to a microfluidic device that may be utilized for cell sensing, counting, and/or sorting. Particular aspects relate to a microfabricated device that is capable of differentiating single cell types from dense cell populations. One particular embodiment relates a device and methods of using the same for sensing, counting, and/or sorting leukocytes from whole, undiluted blood samples.
摘要:
Devices for detecting a particle in a fluid sample are provided. The device includes a segmented microfluidic conduit configured to carry a flow of a fluid sample, where the conduit includes one or more nodes and two or more sections, and a node is positioned between adjacent sections of the conduit. The device also includes a detector configured to detect a change in current through the conduit. Also provided are methods of using the devices as well as systems and kits that include the devices. The devices, systems and methods find use in a variety of different applications, including diagnostic assays.
摘要:
Apparatus (3) for electrically measuring individual particles (4) flowing in a liquid (6), which apparatus (3) comprises: (i) a fluidic channel (5) for receiving a liquid (6) having the individual particles (4) in suspension in the liquid (6); (ii) a first electrode arrangement (8) having at least one measurement electrode (16) and at least one signal electrode (11); (iii) at least one other electrode arrangement (9) having at least one measurement electrode and at least one signal electrode (13); (iv) at least one signal conditioning electrode (10, 12, 14, 15, 17, 19) positioned adjacent to at least one of the measurement electrodes (16, 18) or at least one of the signal electrode (9); and (v) measuring means (20, 21) for measuring electrical signal changes; and the apparatus (3) being such that: (vi) the first and the other electrode arrangements (8, 9) are connected to the measuring means (20, 21) whereby individual particles passing between the first and other electrode arrangements (8, 9) cause a change in electrical signal which is measured; and (vii) the electrical potential of the signal conditioning electrode (10, 12, 14, 15, 17, 19) is controlled to substantially prevent current flow between the first electrode arrangement (8) and the other electrode arrangement (9).
摘要:
Some embodiments of the present disclosure are directed to systems, methods and devices for controlling the transit of a molecule across a nanopore. Some embodiments are directed to a device comprising a first compartment, a second compartment, a first pair of electrodes comprising a first electrode provided in the first compartment and a second electrode provided in the second compartment, a partition separating the first compartment from the second compartment, an orifice provided in the partition, a second pair of electrodes arranged proximate the orifice, the second pair of electrodes being functionalized with molecules, and a tunnel gap comprising the spacing between the second pair of electrodes.
摘要:
A measurement apparatus includes a generation section and a measurement section and performs a predetermined measurement using a flow channel device including a narrow channel through which particles pass by a flow of a fluid and a measurement electrode section provided in the vicinity of the narrow channel. The generation section generates, in the measurement electrode section, an AC voltage that is higher than a characteristic frequency defined by a conductance of the fluid including the particles in the narrow channel and an electrical double layer capacitance formed by the measurement electrode section and has a frequency range indicating a conductance corresponding to a size of the particles. The measurement section measures, while the AC voltage is applied to the measurement electrode section, an electrical amount including at least the conductance obtained when the particles pass through the narrow channel.
摘要:
Described herein are particular embodiments relating to a microfluidic device that may be utilized for cell sensing, counting, and/or sorting. Particular aspects relate to a microfabricated device that is capable of differentiating single cell types from dense cell populations. One particular embodiment relates a device and methods of using the same for sensing, counting, and/or sorting leukocytes from whole, undiluted blood samples.
摘要:
The present technology relates generally to microfluidic devices for measuring platelet coagulation, and associated systems and methods. In some embodiments, a fluidics device includes an array of microstructures including pairs of generally rigid blocks and generally flexible posts. The fluidics device further includes at least one fluid channel configured to accept the array. The fluid channel is configured to induce fluid flow of a biological sample, such as whole blood, through the array. The fluidics device can further include a detection component configured to measure a degree of deflection of one or more of the flexible posts in the array. In some embodiments, the fluidics device comprises a handheld device and usable for point of care testing of platelet forces and coagulation.
摘要:
The present disclosure provides an apparatus for sample introduction including a flow channel, a sample inlet, a metering unit, a separating unit, cell dischargers and, and a pressure controlling unit. The sample inlet is given a sample fluid such as blood. The sample inlet has a constricting hole that communicates with the flow channel for passage of a carrier fluid. The constricting hole has a diameter large enough for passage of a single cell contained in the sample fluid. The sample fluid is introduced into the flow channel through the constricting hole, and the cells in the sample fluid pass one by one through the constricting hole. The constricting hole does not exist inside the flow channel for passage of the carrier fluid, so that the diameter of the constricting hole does not affect the flow rate of the carrier fluid passing through the flow channel.