US 41738299 A description the following discussion is presented to enable a person skilled in the art to make and use the invention various modifications to the preferred embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments and applications without departing from the spirit and scope of the present invention as defined by the appended claims thus the present invention is not intended to be limited to the embodiment show but is to be accorded the widest scope consistent with the principles and features disclosed herein fig1 a is a block diagram showing a device 10 device 10 is an electrotherapy device the device 10 may be include the ability to defibrillate cardiovert or pace a patient or a combination of these features device 10 has a controller 12 that operates an energy delivery system 14 and performs other aspects of the operation of the device software instructions for the operation of the device are accessible from read only memory rom such as incorporated rom 16 the controller accesses instructions for operation from rom 16 it should be understood that in this and other embodiments described below u201c controller u201d means a microprocessor controller gate array other control logic or any combination of these elements controller 12 communicates with.