A system for mounting a covering for an architectural opening in the architectural opening includes a bracket in which an edge of the headrail for the covering can be inserted and a releasable locking system operative with a slide member to securely lock the headrail to the bracket in one position and allow the headrail to be easily removed from the bracket in a different position of the slide. The gas generator generates gas into a reciprocable chamber, whereby reciprocation of the chamber causes a lever to reciprocate a pawl, and this action causes a ratchet to The device may also be provided with manually control for delivering a bolus dose of drug when necessary. The system can then determine the position of the reflection point and correlate the reflection point to image data acquired of a patient. When, an inhomogeneity is present in the respective testing point, excitations are reflected thereon and are measured by the respective ultrasonic receiver.