Cardiac tissue stimulator providing P-wave verification, telemetry, marker channels, and antitachycardia capabilities
First Claim
1. In a cardiac tissue stimulator that includes means for generating stimulation pulses that are delivered to cardiac tissue, and means for sensing electrical activity at or within said cardiac tissue, a means for determining whether sensed electrical activity from said cardiac tissue is verified electrical activity or noise, said means for determining including:
- means for defining a first time period within which electrical activity may be sensed;
verification means for defining a verification period, said verification period being intitiated by the beginning of sensed electrical activity within said first time period;
signaling means for signaling, once said verification means is initiated, whether the sensed electrical activity lasts for a time period that is longer than said verification period, in which case the sensed electrical activity is considered to be verified electrical activity, or whether the sensed electrical activity lasts for a time period that is shorter than said verification period, in which case the sensed electrical activity is considered to be noise.
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Accused Products
Abstract
A programmable cardiac tissue stimulator having a receiving coil and RF pulse width check/data separator (6) for receiving programming data, a communications State sequencer (8) for directing the sequence of command activities within the apparatus, command decode and address latch (12), memory (16, 18, 20, 22, 30, 40, 42) for storing the received programming data, pulse generator logic (24) for generating an output stimulation pulse according to a programmed stimulation scheme, a first timer (32), a second timer (34) and third timer (44) interactive with the pulse generator (24) and memory (16, 18, 20, 22, 30, 40, 42) for carrying out the timing functions of the pulse generator logic (24), a first sensor (46) for sensing electrical activity in the atrium, a second sensor (48) for sensing electrical activity in the ventricle, antitachycardia logic (50) for limiting the rate of natural stimulation of cardiac tissue, an output lead (54) to the atrium, an output lead (56) to the ventricle, and a control clock (28) for controlling timing within the apparatus.
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Citations
39 Claims
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1. In a cardiac tissue stimulator that includes means for generating stimulation pulses that are delivered to cardiac tissue, and means for sensing electrical activity at or within said cardiac tissue, a means for determining whether sensed electrical activity from said cardiac tissue is verified electrical activity or noise, said means for determining including:
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means for defining a first time period within which electrical activity may be sensed; verification means for defining a verification period, said verification period being intitiated by the beginning of sensed electrical activity within said first time period; signaling means for signaling, once said verification means is initiated, whether the sensed electrical activity lasts for a time period that is longer than said verification period, in which case the sensed electrical activity is considered to be verified electrical activity, or whether the sensed electrical activity lasts for a time period that is shorter than said verification period, in which case the sensed electrical activity is considered to be noise. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A multi-mode, programmable, implantable cardiac tissue stimulator, said stimulator selectively providing operating modalities of at least DVI and DDD, and said stimulator including telemetry means for allowing data to be selectively transferred thereto and therefrom, said stimulator comprising:
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atrial sensing means for sensing electrical activity in the atrium of a heart; ventricular sensing means for sensing electrical activity in the ventricle of the heart; pulse generating means for selectively supplying electrical stimulation pulses to the atrium and ventricle of the heart in response to timing control signals; timing control signal generating means for generating said timing control signals, comprising; a first timer (B) that defines a primary pacing interval during which a ventricular stimulation signal (TRV) and an atrial stimulation signal (TRA) are generated upon the occurrence of first and second specified events, respectively, said first and second specified events including the absence of verified sensed electrical activity by said ventricular sensing means and said atrial sensing means respectively, said TRV and TRA signals, if generated, being used by said pulse generating means to respectively trigger the stimulation pulses supplied to the ventricle and atrium, a second timer (A) coupled to said first timer (B) that defines at least a first second-timer state (A1) and a second second-timer state (A2), the first second-timer state (A1) being initialized by the sensing of atrial electrical activity by said atrial sensing means concurrently with first specified conditions, said A1 state defining an A1 interval used to verify the sensing of the electrical activity in the atrium, and the second-timer state (A2) being initialized by the sensing of vertricular electrical activity by said ventricular sensing means concurrently with second specified conditions, said A2 state defining an interval A2 used to verify the sensing of electrical activity in the ventricle, the primarry pacing interval defined by the first timer (B) not being affected by the initialization of the first state A1 of the second timer (A); and marker channel means for signaling through said telemetry means the status of specific events that take place within the heart as sensed by said stimulator, said events including the generation of said TRA and TRV signals, as well as the inhibiting of said TRA and TRV signals as a result of verified sensed electrical activity by said atrial sensing means and said ventricular sensing means, respectively. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. In an implanted cardiac tissue stimulator that includes means for generating stimulation pulses that are delivered to cardiac tissue within a heart, means for sensing depolarization of said cardiac tissue, and telemetry means for allowing data to be selectively transferred to and from the implanted cardiac tissue, a means for breaking a tachycardia that occurs within said cardiac tissue, said means for breaking tachycardia comprising:
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switch means for enabling an anti-tachycardia mode of operation; and anti-tach pulse generation means, operable during said anti-tachycardia mode of operation, for generating anti-tach stimulation pulses that are delivered to a selected chamber of the heart in a specified timing sequence. - View Dependent Claims (36, 37, 38, 39)
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Specification