Patent ID: 8202223
Filing Date: 2012-06-19
Classification: A61B,A61N

Abstract:
1. A method of determining respiratory effort in a medical device, comprising sensing pressure signals to generate sample points; detecting a first predetermined number of sample points less than a detection threshold; detecting a second predetermined number of sample points greater than the detection threshold; detecting an inspiration in response to the first predetermined number of sample points; detecting an expiration in response to the second predetermined number of sample points; detecting a breath in response to the detected inspiration and the detected expiration, wherein the second predetermined number of sample points occur subsequent to the first predetermined number of sample points within the breath; detecting a peak inspiration of a first detected breath during a first interval, wherein the first interval is defined by a sample point of second predetermined sample points associated with a breath detected prior to the first detected breath and a sample point of the second predetermined number of sample points associated with the first detected breath; detecting peak expiration of the first detected breath during a second interval, wherein the second interval is defined by a sample point of the first predetermined number of sample points associated with the first detected breath and a sample point of the first predetermined number of sample points associated with a breath detected subsequent to the first detected breath; determining a difference between the peak inspiration and the peak expiration; and determining the respiratory effort in response to the determined difference.