Cardiac pacemaker with table-based pacing mode implementation
First Claim
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1. A cardiac pacemaker, comprising:
- one or more timers, each timer having an output indicating the timer state and an input for changing the timer state;
sensing circuitry for generating a sensed event when an electrogram signal exceeds a specified threshold;
pacing circuitry for delivering a pacing pulse to a pacing electrode;
a brady RAM containing a brady table which maps particular device states defined by timer states and/or sensed events to associated device actions which include pacing pulse delivery and/or changes in timer states; and
, brady hardware for comparing current timer states and sensed events to a device state contained in the brady table and, if found to match, causing performance of the associated device action.
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Abstract
A device and method for implementing a bradycardia pacing mode are disclosed which is mostly hardware-based but still allows the flexibility for making major changes in brady behavior normally found only in firmware-based implementations. The brady behavior of the device is encapsulated by a table in an area of RAM referred to as brady RAM, and the brady behavior can be changed by re-loading the brady RAM with a different table.
40 Citations
20 Claims
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1. A cardiac pacemaker, comprising:
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one or more timers, each timer having an output indicating the timer state and an input for changing the timer state;
sensing circuitry for generating a sensed event when an electrogram signal exceeds a specified threshold;
pacing circuitry for delivering a pacing pulse to a pacing electrode;
a brady RAM containing a brady table which maps particular device states defined by timer states and/or sensed events to associated device actions which include pacing pulse delivery and/or changes in timer states; and
,brady hardware for comparing current timer states and sensed events to a device state contained in the brady table and, if found to match, causing performance of the associated device action. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for implementing a bradycardia pacing mode in a cardiac pacemaker, comprising:
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mapping particular device states defined by timer states and/or sensed events to associated device actions which include pacing pulse delivery and/or changes in timer states in a brady table contained in a brady RAM; and
,comparing current timer states and sensed events to a device state contained in the brady table and, if found to match, causing performance of the associated device action. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification