Patent ID: 9668713
Date: 2017-06-06
CPC Classifications: A61B,A61N

Claim:
1. A medical system, comprising: a heart sound sensor configured to sense a heart sound signal; a heart sound detector configured to detect a second heart sound (S2) and a third heart sound (S3) from the heart sound signal, wherein, to detect the S3, the heart sound detector is configured to: determine an S2 timing estimate dynamically adjusted based on a heart rate; determine an S3 window that begins at a delay with respect to the determined S2 timing estimate; and to detect the S3 using the sensed heart sound signal in the S3 window; a heart sound analyzer circuit coupled to the heart sound detector, the heart sound analyzer configured to: a heart failure detector circuit configured to detect a condition indicative of worsening heart failure using the trend of the S3 index.