Abstract: An elongate piezoelectric plastic is embodied in a flexible casement to serve as a switching element for electrically motivated apparatus especially as used by disabled persons. The ends of the switch are adhered to portions of a human body that may be moved relatively to each other for activation. The plastic piezoelectric element is of a particular compound nature to enhance signal strength and of a particular configuration to prevent noise and shorting at the peripheral edges. Ancillary electrical circuitry enhances signal strength, logically evaluates multiple signals and annunciates those signals audibly or electrically for relay activated switching of other devices.

Abstract: A sensor structure for attachment to the foot of an animal to continuously measure the pressure of the foot against a reactive surface. The sensor structure provides a small flat particularly configured piece of piezoelectric plastic, encapsulated to protect it and interconnected electrically with telemetry and analyzing apparatus. Plural sensors may be used in various parts of a foot to determine local pressures. The sensed pressure may be recorded and annunciated by various known means to aid analysis of foot and limb activity and general animal physiology.