Appeal No. 96-0935
Application 08/157,737
Bowman also discloses means for detecting that switch components
are not operating in the required manner, in which case an alarm
is sounded (column 5, lines 18 through 29).
Brownlee discloses a cardiac pacing apparatus of the type
that can operate in two modes. The first of these is the demand
mode, that is, in response to a patient's cardiac rate dropping
below a desired level. In the second mode the rate is set to be
fixed and continuous. The problem to which Brownlee is directed
is that of protecting the patient from the effect of non-
physiologically unduced EMI signals, such as 60 Hz, that mimic
normal cardiac rates when such actually is not present, which
could cause the pacer not to respond to the patient's cardiac
emergency (columns 1 through 3). To solve this problem, an EMI
detector is provided in addition to the controller on the pacer.
Upon detection of EMI, the pacer controller is signaled to
override the demand mode and switch the device to the safer,
alternative, fixed and continuous mode.
In the Howson system a cardiac monitoring device is used in
conjunction with the non-physiologically induced EMI signal of a
pain-mitigating device, the latter of which could adversely
effect the detecting capabilities of the former. To avoid this
problem, a detector senses the presence of the EMI and disables
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