Fluidic devices and related methods and wearable devices

A method of fabricating a fluidic device, comprising:

• forming a channel in a substrate, the channel being configured to transport a fluid from a source to a drain and including a first wall with a protrusion into the channel and a second wall opposing the first wall;
• forming an adjustable chamber within the substrate, the channel being positioned adjacent to the first wall of the channel;
• pre-stressing the protrusion to reduce a threshold pressure within the adjustable chamber required for the adjustable chamber to displace the first wall toward the second wall and
• the channel comprises a jagged section between the source and the drain;
• wherein the protrusion comprises a first protrusion in the first wall and the second wall comprises a second protrusion and a third protrusion;
• wherein the first protrusion is configured to fit in a space between the second protrusion and third protrusion when the first wall is displaced toward the second wall.

A wearable device, comprising:

• a controller configured to provide a haptic feedback signal;
• a fluidic device configured to provide haptic feedback to a user in response to receiving the haptic feedback signal from the controller, the fluidic device comprising:
• a fluid channel including a first wall and an opposing second wall, wherein the first wall includes a protruding element that protrudes into the channel;
• and
• a gate adjacent to the first wall, the gate including a chamber with an adjustable volume configured to force the first wall and the protruding element toward the second wall upon application of a fluid pressure within the chamber;
• wherein the protruding element is pre-stressed to reduce a pressure required to displace the first wall toward the second wall;
• and
• wherein the second wall of the channel of the fluidic device further comprises two additional protruding elements that protrudes into the channel, the additional protruding elements are shaped and sized to be intermeshed when the first wall is displaced toward the second wall.