A pedal system particularly tailored to a Fly-By-Wire flight control system includes a double gradient linkage assembly. One treatment includes the use of a very large pore hemofilter to remove target complex molecules andor target molecules from a patient’s blood and to infuse a replacement fluid into the patient’s blood to maintain a prescribed albumin concentration in the patient’s blood. In another aspect, a coupler head is coupled to a body, and a support mechanism is coupled to the body and configured to secure the coupler head within a receiving end of the wired drill pipe. A free end of each first resilient arm is attached to the shelf, and the second resilient arm is for holding the button. The received bitstream is processed in a software layer, enabling the mobile device to process infrared signals without the use of additional hardware configured on the mobile device.