Rate responsive pacemaker and method for automatically initializing the same
First Claim
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1. A pacemaker system comprising a pacemaker including at least one sense amplifier, said system comprising:
- a. sensor means for sensing pacing parameters; and
b. means for automatically initializing the sensitivity of said sense amplifiers to an optimized value via automatically optimizing a sensitivity threshold, including processor means for processing the sensed pacing parameters;
c. said processor means including;
i) means for periodically determining a sense ratio factor (SRF) according to the following equation;
##EQU10## where Recommended Safety Margin is calculated as follows;
Recommended Safety Margin=(% Safety Margin+P %)/100, and Safety Margin and P are programmable values; and
ii) means for determining said optimized sensitivity threshold (Recommended Sensitivity Threshold) by multiplying said SRF by a Programmed Threshold.
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Abstract
A pacemaker system includes a dual sensor implantable pacemaker and an external programmer for automatically and simultaneously optimizing and initializing a plurality of pacing parameters. The pacemaker includes means for automatically initializing a sensitivity threshold, pacing pulse width, pacing pulse amplitude, activity threshold, and pressure rate response gain setting.
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Citations
14 Claims
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1. A pacemaker system comprising a pacemaker including at least one sense amplifier, said system comprising:
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a. sensor means for sensing pacing parameters; and b. means for automatically initializing the sensitivity of said sense amplifiers to an optimized value via automatically optimizing a sensitivity threshold, including processor means for processing the sensed pacing parameters; c. said processor means including; i) means for periodically determining a sense ratio factor (SRF) according to the following equation;
##EQU10## where Recommended Safety Margin is calculated as follows;
Recommended Safety Margin=(% Safety Margin+P %)/100, and Safety Margin and P are programmable values; and
ii) means for determining said optimized sensitivity threshold (Recommended Sensitivity Threshold) by multiplying said SRF by a Programmed Threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A pacemaker system comprising a pacemaker, said system comprising:
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a. pacing pulse generator means for generating pacing pulses; and b. means for automatically initializing the pulse width of pacing pulses from said pacing pulse means to an optimized value via automatically establishing a Recommended Pulse Width, said means for automatically initializing including pulse width optimizing means; c. said pulse width optimizing means including; i) means for measuring peak pressure values; ii) means for averaging said peak pressure values over a predetermined interval of time; iii) means for determining a rheobase point along a strength duration curve; iv) means for determining a chronaxie point based on said rheobase point; v) means for determining an initialized pulse width parameter according to the following equation;
space="preserve" listing-type="equation">Recommended Pulse Width=Pulse Width of the Chronaxie. - View Dependent Claims (8, 9)
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10. A pacemaker system comprising an activity-based, rate-responsive pacemaker, said system comprising:
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a. pacing pulse generator means for generating pacing pulses; b. rate modulation means coupled to said pacing pulse generator means for modulating said pacing pulses based on sensed activity; and c. means for automatically initializing an activity threshold to be used by said rate modulation means to an optimized value including optimizing means; c. said optimizing means including; i) means for setting the activity threshold to an initial setting; ii) means for periodically counting sensed activity events at rest; and iii) means for automatically selecting one of a plurality of higher settings for said activity threshold, if said counting means indicates a positive activity count. - View Dependent Claims (11)
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12. A pacemaker system comprising a pacemaker, said system comprising:
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a. pressure rate-response means for changing pacing rates of said pacemaker in response to sensed pressure signals; b. sensor means for sending pressure rate response gain threshold signals as sensed pacing parameters to said pressure rate-response means; c. processor means for processing the sensed pacing parameters, and for setting optimal values for the pacing parameters; d. said processor means including means for automatically optimizing a pressure rate response gain threshold parameter; and e. said optimizing means including; i) means for counting and measuring valid peak pressure value (dP/dt); ii) means for averaging said peak pressure values over a predetermined interval of time; iii) means for calculating a resting pressure value according to the following equation;
##EQU11## where M is a programmable value in pulses per minute; and
iv) means for extrapolating said resting pressure value to calculate the rate response gain setting, as follows;
##EQU12## - View Dependent Claims (13)
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14. A pacemaker system comprising a pacemaker, said system comprising:
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a. pacing pulse generator means for generating pacing pulses, said pacing pulse generator means employing a pacing pulse width parameter and a pacing pulse amplitude parameter; b. rate modulation means coupled to said pacing pulse generator means for modulating said pacing pulses, said rater modulation means employing an activity threshold parameter and a pressure rate response gain threshold parameter; c. at least a sense amplifier employing a sensitivity threshold parameter; and d. processor means, said processor means comprising; i) first optimizing means for optimizing said sensitivity threshold parameter; ii) second optimizing means for automatically initializing said pacing pulse width parameter; iii) third means for automatically initializing said pacing pulse amplitude parameter; iv) fourth optimizing means for automatically initializing said activity threshold parameter; and v) fifth optimizing means for automatically initializing said pressure rate response gain threshold parameter.
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Specification