Leadless intra-cardiac medical device with dual chamber sensing through electrical and/or mechanical sensing

Patent metadata

Field	Value
Publication number	US-9278218-B2
Application number	US-201514630433-A
Country	US
Kind code	B2
Filing date	Feb 24, 2015
Priority date	Nov 4, 2011
Publication date	Mar 8, 2016
Grant date	Mar 8, 2016

Abstract

A leadless intra-cardiac medical device senses cardiac activity from multiple chambers and applies cardiac stimulation to at least one cardiac chamber and/or generates a cardiac diagnostic indication. The leadless device may be implanted in a local cardiac chamber (e.g., the right ventricle) and detect near-field signals from that chamber as well as far-field signals from an adjacent chamber (e.g., the right atrium).

First claim

What is claimed is:

1. A cardiac stimulation method, comprising:
sensing near-field signals in a ventricle using at least one first electrode of a leadless intra-cardiac medical device configured to be positioned entirely within an intra-cardiac space;
sensing far-field signals in the ventricle using at least one second electrode of a leadless intra-cardiac medical device configured to positioned entirely within an intra-cardiac space;
determining whether at least one ventricular event occurred based on the sensed near-field signals,
determining whether at least one atrial event occurred based on the sensed far-field signals; and
generating at least one cardiac stimulation pulse based on the determination of whether the at least one ventricular event occurred and the determination of whether the at least one atrial event occurred.

2. The method of claim 1 , wherein the leadless intra-cardiac medical device is implanted in a heart such that no part of the leadless intra-cardiac medical device is located in a cardiac chamber from which the far-field signals originate.

3. The method of claim 1 , wherein:
the determination of whether the at least one ventricular event occurred comprises identifying timing of an R wave; and
the determination of whether the at least one atrial event occurred comprises identifying timing of a P wave based on the identified timing of the R wave.

4. The method of claim 1 , wherein the determination of whether the at least one atrial event occurred comprises:
filtering the far-field signals based on a first bandwidth;
filtering the far-field signals based on a second bandwidth, wherein the first bandwidth is narrower than the second bandwidth; and
comparing the filtered far-field signals to identify a P wave.

Assignees

• Pacesetter Inc

Inventors

• Karst Edward
• Samade Richard
• Bornzin Gene A
• Poore John W
• Somogyi Zoltan
• Theret Didier

Classifications

• A61N1/36592

  controlled by the heart rate variability · CPC title

• A61B5/1107

  Measuring contraction of parts of the body, e.g. organ or muscle · CPC title

• A61N1/36514

  controlled by a physiological quantity other than heart potential, e.g. blood pressure (controlled by two or more physical parameters A61N1/36585) · CPC title

• A61B5/0452

  Human Necessities · mapped topic

• A61N1/36578

  controlled by mechanical motion of the heart wall, e.g. measured by an accelerometer or microphone · CPC title