Cartridges and instruments for sample analysis
Provided herein are instruments and cartridges for processing samples. The cartridges include fluidic circuits in which fluid movement can be regulated by diaphragm valves. In certain cartridges, deformable material providing a diaphragm contacts an interface in the instrument that actuates the diaphragm directly, without intervening actuation layer. Certain cartridges have a plurality of fluidic circuits and fluid distribution channels or pneumatic distribution channels configured to deliver fluids or pneumatic pressure to any of the fluidic circuits, selectively. Certain cartridges have compartments containing on-board reagents. Compartments can be closed by a film attached to a body the cartridge through a heat seal.
1. A fluidic device comprising:
a fluidics layer comprising one or more fluidic channels in a thermoplastic material;
a deformable membrane covering the one or more fluidic channels and comprising a heat seal material capable of plastic deformation, the heat seal material being thermally bonded to the fluidics layer;
one or more diaphragm valves, each diaphragm valve configured to regulate fluid flow in an associated fluidic channel, wherein each diaphragm valve comprises:
a) a diaphragm comprised in the deformable membrane;
b) a valve seat in the associated fluidic channel and recessed from a surface of the fluidics layer that contacts the deformable membrane; and
c) a valve inlet and a valve outlet comprised in the fluidics layer; wherein the one or more diaphragm valves are each configured for activation by a ram such that mechanical pressure by the ram on the deformable membrane presses the membrane against the valve seat, thereby closing the valve.
2. The device of claim 1 wherein the deformable membrane does not comprise an elastomer.
3. The device of claim 1 wherein the deformable membrane comprises a laminate.
4. The device of claim 1 wherein the deformable material has a durometer value of between 10 to 80 Shore D.
5. The device of claim 1 , comprising a plurality of diaphragm valves.
6. The device of claim 1 , wherein the deformable membrane comprises a permanent deformation.
7. The device of claim 1 , wherein the thermoplastic material comprises polypropylene.
8. The device of claim 1 , wherein the valve seat has the shape of a sphere, an inverted dimple, a dome, or a saddle.
9. The device of claim 1 , comprising one or more fluidic circuits.
10. The device of claim 1 , wherein the fluidics layer further comprises a fluidic compartment in fluid communication with a fluidic channel.
11. The device of claim 1 , wherein the fluidics layer further comprises an exit port in fluidic communication with a fluidic channel.
12. The device of claim 1 , further comprising a ram configured to actuate the diaphragm.
13. The device of claim 1 , which does not comprise an actuation layer.
14. The device of claim 1 , wherein the deformable membrane comprises a material selected from polypropylene, polyethylene, polystyrene, cycloolefin co-polymer (COC) and polyacetate.
15. The device of claim 1 , wherein valve can be opened by releasing pressure of the ram against the deformable membrane.