Abstract: A method of processing a raw acceleration signal, measured by an accelerometer-based compression monitor, to produce an accurate and precise estimated actual depth of chest compressions. The raw acceleration signal is filtered during integration and then a moving average of past starting points estimates the actual current starting point. An estimated actual peak of the compression is then determined in a similar fashion. The estimated actual starting point is subtracted from the estimated actual peak to calculate the estimated actual depth of chest compressions. In addition, one or more reference sensors (such as an ECG noise sensor) may be used to help establish the starting points of compressions. The reference sensors may be used, either alone or in combination with other signal processing techniques, to enhance the accuracy and precision of the estimated actual depth of compressions.

Abstract: A method of relieving surface stress on a thin wafer by removing a small portion of the wafer substrate, the substrate being removed by applying a solution of KOH to the wafer while the wafer spins.

Abstract: A bubble wand with an ornamental figure and an ornamental bubble loop. The ornamental figure and ornamental loop are provided in the form of beads, shapes, letters, a small figurine of an animal, plant, person, cartoon character, action figure, or other attractive representation. The ornamental figure and loop are attached to the wand or are provided with a means for releasably or slidably attaching the ornamental figure to the wand or to a suction tube used in many soap dispensers.