title: Digital stimulator control system for introducing premature stimuli.
abstract: A control system to convert a general-purpose stimulator into one which will generate premature stimuli at variable but controlled intervals is described. The control system was developed to sense spontaneous cardiac depolarizations and inject premature stimuli at preset elapsed times after every 10th or every spontaneous depolarization. The delay may be set by an analog circuit or by digital thumb-wheel switches. The output of the stimulator also may be coupled to the input, permitting the use of the system as a standard asynchronous stimulator with digital control of the pulse interval. A block diagram is presented to permit duplication of the system using standard digital and analog integrated circuits.
mesh_terms: D000818:Animals; D003365:Costs and Cost Analysis; D004285:Dogs; D004558:Electric Stimulation / Q000295:instrumentation*; D009200:Myocardial Contraction; D010138:Pacemaker, Artificial / Q000295:instrumentation*