Abstract: An infusion pump includes at least one cylinder-and-piston intake device for a liquid in a container and for dispensing the liquid into a connection link to the patient. In a preferred embodiment, the pump includes at least one metering cylinder containing a piston, each cylinder terminates in a cavity communicating with a supply receptacle for liquids, a diaphragm that is fluid-tight and deformable between the cylinder and the cavity, a disk located in each cavity, a spring urging the disk towards the cylinder, and a delivery connection between the cavity and the cylinder.

Abstract: A linear electromyographic biofeedback system operates over a dynamic range of at least one thousand to one. That is, the system remains linear from input levels of approximately one microvolt to input levels in excess of one millivolt. The linear electromyographic biofeedback system includes a sensitive transducer which is followed by a protection circuit and connected to a differential amplifier for eliminating common mode noise. The output of the differential amplifier is filtered and amplified to further eliminate unwanted signals. This filtered signal is rectified and averaged in a third order averaging filter to obtain a close approximation of a time averaging without the necessity of discrete timing periods.