Heart pacing pulse detection system
First Claim
1. A heart pacing pulse detection system comprising:
- (a) means for inputing ECG signals;
(b) a digital signal processor;
(c) a multiplexer including a plurality of cardiac pacing artifact channel lines coupled to said inputting means and including select lines coupled to said digital signal processor;
(d) a signal amplifier connected to said multiplexer and including a gain select line coupled to said digital signal processor;
(e) a differentiator coupled to said signal amplifier;
(f) a filter connected to said differentiator;
(g) a bipolar comparator and signal squarer connected to said filter;
(h) a programmable positive voltage reference and a programmable negative voltage reference connected between said bipolar comparator and said signal squarer and said select lines from said digital signal processor;
(i) an optical isolator connected to said bipolar comparator and said signal squarer;
(j) an inverter connected to said optical isolator and outputting an interrupt pulse to said digital signal processor; and
(k) a state machine including a reset line from said digital signal processor and interval timer connected to said optical isolator and outputting data representative of a cardiac pacing pulse width to said digital signal processor.
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Accused Products
Abstract
A system including a process for enhancing detection of a pacing artifact in a patient having artificially paced myocardial contractions. The detection is accomplished by sensing seven EKG leads. Each lead provides a view of the heart from a different angle. The process relies on differentially amplifying the sensed pulses separately and passing the pulses through a filter. An algorithm is utilized to detect the noise level and the pacing artifact amplitude, and automatically select a proper trigger level. False pacing artifacts are eliminated by use of the software qualification. The principal is that if the hardware differentiator produces a signal due to noise or a pacing artifact, an interrupt is generated.
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Citations
14 Claims
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1. A heart pacing pulse detection system comprising:
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(a) means for inputing ECG signals; (b) a digital signal processor; (c) a multiplexer including a plurality of cardiac pacing artifact channel lines coupled to said inputting means and including select lines coupled to said digital signal processor; (d) a signal amplifier connected to said multiplexer and including a gain select line coupled to said digital signal processor; (e) a differentiator coupled to said signal amplifier; (f) a filter connected to said differentiator; (g) a bipolar comparator and signal squarer connected to said filter; (h) a programmable positive voltage reference and a programmable negative voltage reference connected between said bipolar comparator and said signal squarer and said select lines from said digital signal processor;
(i) an optical isolator connected to said bipolar comparator and said signal squarer;
(j) an inverter connected to said optical isolator and outputting an interrupt pulse to said digital signal processor; and
(k) a state machine including a reset line from said digital signal processor and interval timer connected to said optical isolator and outputting data representative of a cardiac pacing pulse width to said digital signal processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A heart pacing pulse detection system comprising:
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(a) a plurality of ECG leads; (b) an analog detector connected to said plurality of ECG leads; and (c) a signal processor connected to said analog detector, said signal processor comprising; (i) a timer control/interrupt handler connected to said analog detector; (ii) a signal screener having an output and connected to said timer control/interrupt handler; (iii) an event counter filter connected to said timer control/interrupt handler and said output of said signal screener; and (iv) an automatic detection level adjustment circuit connected between said event counter filter and said analog detector. - View Dependent Claims (12)
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13. A process for heart pacing pulse detection comprising the steps of
(a) monitoring a patient'"'"'s skin surface potentials; -
(b) passing signals representative of said skin surface potentials through a differentiator and a low pass filter to generate filtered output signals; (c) comparing said filtered output signals with predetermined programmable reference signals to generate interrupt signals; (d) counting and filtering said interrupt signals to generate filtered counts of events, wherein said events are possible pacing artifacts; and (e) adjusting a predetermined detection level with respect to said filtered counts of events and adjusting said programmable reference signals in response to said adjusted predetermined detection level to detect pacing artifacts. - View Dependent Claims (14)
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Specification