Devices and methods are provided for penetrating tissue andor effecting movement of devices relative to tissue. The material is combination of: A\u2014a latex polymer emulsion; B\u2014a dry blend to Type 1 Portland cement and specially sieved washed mason sand; C\u2014a special non-skid aggregate; and water. During the dry etching step, the photomask is exposed to an etchant gas mixture which exhibit a selectivity equal to or higher than 1. The disposable portion of the sensor is removably attached to the reusable portion in a manner that allows the disposable portion to be readily replaced when the adhesive is expended or the tape becomes soiled or excessively worn. Preferably a firing device of a vehicle occupant protection system is used as one of the power loads.