A mechanical force switch to be disposed along a longitudinal device axis of a medical device, wherein the mechanical force switch comprises an electrically conductive switching piston (10) having a longitudinal piston axis (2) and a bias-device contact (14), a hollow body (30) defining a body interior cavity (32, 34) in which the piston is moveably disposed, an end stop (40, 130) defining a second interior cavity (44, 132) in which the piston is moveably disposed, and a bias device (50) disposed about at least a portion of the piston between the end stop and a bias-device contact (14) of the piston (10) and imparting a variable longitudinal bias thereagainst to retain the piston (10) in a switch-making position or a switch-breaking position until an external force imparted to the piston (10) exceeds the longitudinal bias.
