PROCESSING OF LAP SIGNALS
First Claim
Patent Images
1. A system for determining cardiac events, said system comprising:
- a connector connectable to an implantable pressure sensor configured to generate a left atrial pressure, LAP, signal representative of a left atrial pressure of a subject during at least one cardiac cycle;
a derivative processor configured to process said LAP signal and generate a derivative LAP signal representative of a first time derivative of said LAP signal; and
an aortic valve opening identifier configured to process said derivative LAP signal and identify a time point of opening of an aortic valve of a heart in said subject to coincide with a time point of a minimum in said derivative LAP signal following depolarization of ventricles of said heart for a cardiac cycle.
1 Assignment
0 Petitions
Accused Products
Abstract
Cardiac valve events are monitored by recording a left atrial pressure (LAP) representing signal using an implantable pressure sensor (50). The LAP signal is processed in order to generate a derivative LAP signal representative of the first time derivative of the LAP signal. The opening of the aortic valve of the heart is then identified to coincide in time with a minimum in the derivative LAP signal following ventricular depolarization in a cardiac cycle.
9 Citations
24 Claims
-
1. A system for determining cardiac events, said system comprising:
-
a connector connectable to an implantable pressure sensor configured to generate a left atrial pressure, LAP, signal representative of a left atrial pressure of a subject during at least one cardiac cycle; a derivative processor configured to process said LAP signal and generate a derivative LAP signal representative of a first time derivative of said LAP signal; and an aortic valve opening identifier configured to process said derivative LAP signal and identify a time point of opening of an aortic valve of a heart in said subject to coincide with a time point of a minimum in said derivative LAP signal following depolarization of ventricles of said heart for a cardiac cycle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method for identifying cardiac valve events, said method comprising:
-
generating a left atrial pressure, LAP, signal representative of a left atrial pressure of a subject during at least one cardiac cycle; calculating, based on said LAP signal, a derivative LAP signal representative of a first time derivative of said LAP signal; and identifying a time point of opening of an aortic valve of a heart in said subject to coincide with a time point of a minimum in said derivative LAP signal following depolarization of ventricles of said heart for a cardiac cycle. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
-
Specification