Abstract: Implantable medical systems enter an exposure mode of operation, either manually via a down linked programming instruction or by automatic detection by the implantable system of exposure to a magnetic disturbance. A controller then determines the appropriate exposure mode by considering various pieces of information including the device type including whether the device has defibrillation capability, pre-exposure mode of therapy including which chambers have been paced, and pre-exposure cardiac activity that is either intrinsic or paced rates. Additional considerations may include determining whether a sensed rate during the exposure mode is physiologic or artificially produced by the magnetic disturbance. When the sensed rate is physiologic, then the controller uses the sensed rate to trigger pacing and otherwise uses asynchronous pacing at a fixed rate.

Abstract: A dental isolation dam has a plurality of elastic fibers arranged in a rectangular, crisscrossed pattern between impervious films. The fibers enable the dam to be easily placed, and, once released, clinch around necks of isolated teeth to provide enhanced moisture and infection control.

Abstract: A low cost dot printer head which includes a base plate of ferromagnetic material with slots that divide a rear portion of the plate into several magnetic circuits that are isolated from one another and that hold separate coils for individually magnetizing the circuits, the head also including an armature slideable along each magnetic circuit and a printer wire having a rear end fixed to a corresponding armature and a front end slideable in a guide mounted at the front of the base plate.