Automatic capture verification within leadless implantable medical devices
First Claim
1. A leadless implantable medical device (LIMD) for implant within the heart of a patient, comprising:
- a case, wherein at least a portion of the case being configured as an anode electrode, wherein the anode electrode has a surface area of at least 133 mm2 to substantially prevent anodal stimulation;
a tip electrode extending from the case;
a pulse generator coupled to the tip electrode and the anode electrode and equipped to generate a cathodal stimulation pulse for delivery to patient tissues with an anodal recharge;
a sensing system equipped to sense electrocardiac signals using the tip electrode with reference to the anode electrode; and
an automatic capture verification system operative to verify capture of the cathodal stimulation pulse based on sensed electrocardiac signals.
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Accused Products
Abstract
In one example, a leadless implantable medical device (LIMD) generates a cathodal stimulation pulse with anodal recharge for delivery to patient heart tissues using the tip electrode and the anode electrode. The LIMD then verifies capture of the cathodal stimulation pulse and, if capture is not verified, delivers a cathodal backup stimulation pulse with anodal recharge using the tip electrode and the anode electrode. Automatic capture verification is thereby provided within an LIMD to allow for a reduction in the magnitude of stimulation pulses and to extend the lifetime of the device. In one particular example, the anode is a middle portion of a cylindrical case with a surface area sufficient to prevent anodal stimulation. Other portions of the case are coated with an electrically insulating material to render those portions substantially electrically inert. A voltage halver may be used to further reduce power consumption.
36 Citations
18 Claims
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1. A leadless implantable medical device (LIMD) for implant within the heart of a patient, comprising:
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a case, wherein at least a portion of the case being configured as an anode electrode, wherein the anode electrode has a surface area of at least 133 mm2 to substantially prevent anodal stimulation; a tip electrode extending from the case; a pulse generator coupled to the tip electrode and the anode electrode and equipped to generate a cathodal stimulation pulse for delivery to patient tissues with an anodal recharge; a sensing system equipped to sense electrocardiac signals using the tip electrode with reference to the anode electrode; and an automatic capture verification system operative to verify capture of the cathodal stimulation pulse based on sensed electrocardiac signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A system for use with a leadless implantable medical device (LIMD) for implant within a patient, the LIMD having a tip electrode and an anode electrode, the system comprising:
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means for generating a cathodal stimulation pulse with anodal recharge for delivery to patient tissues using the tip electrode and the anode electrode, wherein the anode electrode has a surface area of at least 133 mm2 to substantially prevent anodal stimulation; means for verifying capture of the cathodal stimulation pulse; and means for delivering a cathodal backup stimulation pulse with anodal recharge using the tip electrode and the anode electrode when capture is not verified.
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17. A leadless implantable medical device (LIMD) for implant within the heart of a patient, comprising:
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a case, wherein at least a portion of the case being configured as an anode electrode; a tip electrode extending from the case; a pulse generator coupled to the tip electrode and the anode electrode and equipped to generate a cathodal stimulation pulse for delivery to patient tissues with an anodal recharge; a sensing system equipped to sense electrocardiac signals using the tip electrode with reference to the anode electrode; and an automatic capture verification system operative to verify capture of the cathodal stimulation pulse based on sensed electrocardiac signals, wherein the automatic capture verification system includes a biquad amplifier coupled to the sensing system with a center frequency and a Q value sufficient to detect a positive derivative within the electrocardiac signals to verify capture. - View Dependent Claims (18)
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Specification