Co-casted fluidic devices

A fluidic device, comprising:

• a channel configured to transport a fluid from a source to a drain and comprising a first wall and a second wall;
• a gate that includes a chamber with an adjustable volume that affects fluid flow within the channel by displacing the first wall toward the second wall, the displacing based in part on fluid pressure within the chamber;
• a rigid element configured to reduce an amount of fluid required for operation of the gate;
• and
• a force concentrator located between the chamber and the first wall, wherein the force concentrator comprises a convex force reception surface having a first area oriented towards the chamber and a concave force concentration surface having a second, smaller area oriented towards the first wall, wherein the rigid element is located on an opposite side of the channel from the force concentrator.

A fluidic device, comprising:

• a channel configured to transport a fluid from a source to a drain, wherein the channel comprises a first wall and a second wall, wherein the first wall includes a plurality of protruding elements, each of the protruding elements protruding into the channel such that a diameter of the channel is decreased;
• a gate that includes a chamber with an adjustable volume that affects fluid flow within the channel by displacing the first wall toward the second wall, the displacing based in part on fluid pressure within the chamber;
• and
• rigid elements configured to reduce an amount of fluid required for operation of the gate,
• wherein at least a portion of the chamber is positioned between at least one of the rigid elements and the channel.