Fluidic devices with diaphragm valves
First Claim
1. A microfluidic device comprising a fluidics layer, an actuation layer and an elastic layer sandwiched between the fluidics layer and the actuation layer, wherein:
- (a) the fluidics layer and the actuation layer comprise sealing surfaces that contact the elastic layer; and
(b) the fluidics layer comprises a plurality of fluid conduits comprising surfaces, and the actuation layer comprises a plurality of actuation conduits comprising surfaces, wherein at least a portion of the surfaces of the fluid conduits and actuation conduits are exposed to the elastic layerand further comprising a plurality of diaphragm valves that each regulate fluid flow in a fluid conduit, wherein each diaphragm valve comprises;
(i) a valve body comprising a surface of the actuation layer exposed to the elastic layer,(ii) a valve seat comprising a surface of the fluidic layer exposed to the elastic layer,(iii) a diaphragm comprised in the elastic layer and configured to sit on or off a surface of the valve seat, and(iv) valve ports configured to allow fluid to enter and exit the valve,wherein at least a portion of the valve seat surface is coated with a low surface energy material having a water contact angle of at least 100° and
the elastic layer is not bonded to the valve seat.
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0 Petitions
Accused Products
Abstract
This invention provides fluidic devices, in particular microfluidic devices, with diaphragm valves having low failure rates. Low failure rates are achieved by inhibiting sticking of the diaphragm to functional surfaces such as valve seats, valve chamber and fluidic channels and conduits. One way to implement this is to provide exposed surfaces facing the diaphragm, particularly valve seats, with a low energy material, such as a noble metal, a perfluorinated polymer, a self-assembled monolayer, hard diamond, diamond-like carbon or a metal oxide. In other embodiments, the valves are provided with ridges and the diaphragm is adhered to the fluidic or actuation layer with an adhesive material.
405 Citations
34 Claims
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1. A microfluidic device comprising a fluidics layer, an actuation layer and an elastic layer sandwiched between the fluidics layer and the actuation layer, wherein:
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(a) the fluidics layer and the actuation layer comprise sealing surfaces that contact the elastic layer; and (b) the fluidics layer comprises a plurality of fluid conduits comprising surfaces, and the actuation layer comprises a plurality of actuation conduits comprising surfaces, wherein at least a portion of the surfaces of the fluid conduits and actuation conduits are exposed to the elastic layer and further comprising a plurality of diaphragm valves that each regulate fluid flow in a fluid conduit, wherein each diaphragm valve comprises; (i) a valve body comprising a surface of the actuation layer exposed to the elastic layer, (ii) a valve seat comprising a surface of the fluidic layer exposed to the elastic layer, (iii) a diaphragm comprised in the elastic layer and configured to sit on or off a surface of the valve seat, and (iv) valve ports configured to allow fluid to enter and exit the valve, wherein at least a portion of the valve seat surface is coated with a low surface energy material having a water contact angle of at least 100° and
the elastic layer is not bonded to the valve seat. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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Specification