Digital microfluidics systems, apparatuses and methods of using them
High-throughput digital microfluidic (DMF) systems and methods (including devices, systems, cartridges, DMF apparatuses, etc.), are described herein. The systems, apparatuses and methods integrate liquid handling with the DMF apparatuses, providing flexible and efficient sample reactions and sample preparation. These systems, apparatuses and methods may be used with a variety of cartridge configurations and sizes.
1 . A method of coordinating droplet movement and liquid handling in a cartridge within a microfluidics apparatus, the method comprising:
disposing a plurality of cartridges on a seating surface of the microfluidics apparatus, wherein each of the plurality of cartridges sits on a sub-region of the seating surface;
sensing, on the seating surface, respective seating locations of the plurality of cartridges, wherein the plurality of cartridges have differing sizes and the seating surface includes a plurality of seating locations for the plurality of cartridges;
determining a sub-set of driving electrodes underlying the respective seating locations of the plurality of cartridges;
selectively applying, based on the sensing, a vacuum to the respective seating locations of the plurality of cartridges to immobilize the plurality of cartridges to the seating surface of the microfluidics apparatus;
disposing a droplet from a liquid handling subsystem within each of the plurality of cartridges via respective fluidic inputs; and
activating a first selected driving electrode underlying each of the plurality of cartridges to drive each respective droplet to a respective second location within each of the plurality of cartridges by electrowetting.
2 . The method of claim 1 , wherein each second location within the one or more cartridges comprises a fluidic output.
3 . The method of claim 1 , further comprising withdrawing a respective droplet of fluid at each respective second location within the one or more cartridges, wherein withdrawing comprises applying suction via at least one liquid handling tip.
4 . The method of claim 3 , wherein when the liquid handling subsystem comprises a plurality of liquid handling tips, withdrawing the respective droplet of fluid is performed in parallel.
5 . The method of claim 1 , wherein activating the at least first selected driving electrode of each respective region of the plurality of driving electrodes further comprises electrically coupling the first selected driving electrode to an adjacent second driving electrode of each respective region.
6 . A method of coordinating droplet movement and liquid handling in a plurality of cartridges within a microfluidics apparatus, the method comprising:
disposing a first cartridge at a first seating location upon a seating surface and a second cartridge at a second seating location upon the seating surface;
sensing, on the seating surface, respective seating locations of the first cartridge and the second cartridge, wherein the first and second cartridges are different sizes and the seating surface includes a plurality of seating locations for the first and second cartridges;
selectively immobilizing the first cartridge and the second cartridge to the seating surface of the microfluidics apparatus based on the sensing;
identifying a first sub-set of the plurality of driving electrodes underlying the first seating location and a second region comprising a second sub-set of the plurality of driving electrodes underlying the second seating location;
disposing, via a robotic arm, a first droplet from a liquid handling subsystem within the first cartridge and a second droplet within the second cartridge; and
activating at least a first selected driving electrode of each respective sub-set to drive each respective droplet to a respective second location within each of the first and second cartridges by electrowetting.
7 . The method of claim 6 , wherein selectively immobilizing the first cartridge and the second cartridge comprises disposing the first cartridge and the second cartridge at selected locations upon the seating surface and applying vacuum to the seating surface.
8 . The method of claim 7 , wherein selectively immobilizing further comprising applying vacuum selectively to the seating surface only at the selected locations beneath the first cartridge and the second cartridge.
9 . The method of claim 6 , wherein disposing the first droplet comprises disposing through an air gap of the first cartridge to any location within an inner surface of the first cartridge and disposing through an air gap of the second cartridge to any location within an inner surface of the second cartridge.
10 . The method of claim 6 , wherein disposing the second droplet within the second cartridge comprises disposing the second droplet through a port at one or more predefined locations on an upper plate of the second cartridge.
11 . The method of claim 6 , wherein disposing the first droplet within the first cartridge and disposing the second droplet within the second cartridge comprises disposing the first droplet and the second droplet substantially at a same time.
12 . The method of claim 6 , wherein activating the first selected driving electrode of each respective sub-set to drive each respective droplet to a respective second location further comprises electrically coupling the first selected driving electrode to an adjacent second driving electrode of each respective sub-set of the plurality of driving electrodes.
13 . The method of claim 6 , wherein activating the first selected driving electrode of each respective sub-set to drive each respective droplet to a respective second location is performed substantially at a same time.
14 . The method of claim 6 , wherein each respective second location further comprises a fluidic output.
15 . The method of claim 14 , further comprising a fluidic output at the second location of the first cartridge configured for withdrawing a droplet through an air gap of the first cartridge from any location within an inner surface of the second cartridge; and further wherein the fluidic output at the second location within the second cartridge comprises a port at one or more predefined locations on an upper plate of the second cartridge.
16 . The method of claim 15 , further comprising withdrawing a respective droplet of fluid at each respective second location within the first cartridge and the second cartridge, wherein withdrawing comprises applying suction via at least one liquid handling tip of the liquid handling subsystem.
17 . The method of claim 16 , wherein when the liquid handling subsystem comprises a plurality of liquid handling tips, withdrawing the respective droplet of fluid is performed in parallel.
18 . A method of coordinating droplet movement and liquid handling in a cartridge within a microfluidics apparatus, the method comprising:
disposing a plurality of cartridges on a seating surface of a microfluidics apparatus, wherein each of the cartridge of the plurality of cartridges sits on a sub-region of the seating surface;
sensing, on the seating surface, respective seating locations of each cartridge of the plurality of cartridges, wherein the plurality of cartridges have differing sizes and the seating surface includes a plurality of seating locations for the plurality of cartridges;
selectively applying a vacuum based on sensing the respective seating locations, to just the respective seating locations of each of the cartridge of the plurality of cartridges to immobilize the plurality of cartridges to the seating surface of the microfluidics apparatus;
disposing a droplet from a liquid handling subsystem within each of the cartridge of the plurality of cartridges via respective fluidic inputs; and
activating a first selected driving electrode underlying each of the cartridge of the plurality of cartridges to drive each respective droplet to a respective second location within each of the cartridges of the plurality of cartridges by electrowetting.
19 . The method of claim 18 , wherein selectively applying a vacuum to just the respective seating locations of each of the cartridge of the plurality of cartridges comprises not activating vacuum to other regions of the seating surface of the microfluidics apparatus.