A fluidic device comprising: a channel (420;520) configured to transport a fluid from a source (430;530) to a drain (440;540), wherein the source (430;530) is an input allowing fluid to enter the channel (420;520), and the drain (440;540) is an output for the fluid in the channel (420;520); and a gate in the form of an obstruction (410;510) that is configured to control a rate of fluid flow between the source (430;530) and the drain (440;540) in accordance with the fluid pressure within the gate, the obstruction (410;510) configured to induce a first flow rate of the fluid in the channel (420;520) in accordance with the low pressure state of the gate and a second flow rate of the fluid in the channel (420;520) in accordance with the high pressure state of the gate, characterised in that the gate includes a plurality of inextensible elements (415;515) that have a first shape at the low pressure state and a second shape at the high pressure state, the inextensible elements (415;515) are made of a material such that the inextensible elements (415;515) are flexible but inextensible and expand in a first direction and shrink in a second direction when fluid pressure within the inextensible elements (415;515) is increased thereby decreasing a distance that the obstruction (410;510) protrudes into the channel (420;520), the plurality of inextensible elements (415;515) are configured, at the low pressure state, to take on the first shape, causing the obstruction (410;510) to protrude into the channel (420;520) to adjust fluid flow in the channel (420;520) to the first flow rate, and, at the high pressure state, to take on the second shape, causing the obstruction (410;510) to protrude less into the channel (420;520) to adjust fluid flow in the channel (420;520) to the second flow rate, and in that the first flow rate is lower than the second flow rate. a channel (420;520) configured to transport a fluid from a source (430;530) to a drain (440;540), wherein the source (430;530) is an input allowing fluid to enter the channel (420;520), and the drain (440;540) is an output for the fluid in the channel (420;520); and a gate in the form of an obstruction (410;510) that is configured to control a rate of fluid flow between the source (430;530) and the drain (440;540) in accordance with the fluid pressure within the gate, the obstruction (410;510) configured to induce a first flow rate of the fluid in the channel (420;520) in accordance with the low pressure state of the gate and a second flow rate of the fluid in the channel (420;520) in accordance with the high pressure state of the gate, characterised in that the gate includes a plurality of inextensible elements (415;515) that have a first shape at the low pressure state and a second shape at the high pressure state, the inextensible elements (415;515) are made of a material such that the inextensible elements (415;515) are flexible but inextensible and expand in a first direction and shrink in a second direction when fluid pressure within the inextensible elements (415;515) is increased thereby decreasing a distance that the obstruction (410;510) protrudes into the channel (420;520), the plurality of inextensible elements (415;515) are configured, at the low pressure state, to take on the first shape, causing the obstruction (410;510) to protrude into the channel (420;520) to adjust fluid flow in the channel (420;520) to the first flow rate, and, at the high pressure state, to take on the second shape, causing the obstruction (410;510) to protrude less into the channel (420;520) to adjust fluid flow in the channel (420;520) to the second flow rate, and in that the first flow rate is lower than the second flow rate.