US 11,896,284 B2
System and method for measurement of an impedance using a catheter such as an ablation catheter
Stephan P. Miller, Minneapolis, MN (US); Glen H. Kastner, Saint Michael, MN (US); and Donald Curtis Deno, Andover, MN (US)
Assigned to St. Jude Medical, Atrial Fibrillation Division, Inc, St. Paul, MN (US)
Filed by St. Jude Medical, Atrial Fibrillation Division, Inc., St. Paul, MN (US)
Filed on Apr. 17, 2020, as Appl. No. 16/851,441.
Application 16/851,441 is a continuation of application No. 11/966,232, filed on Dec. 28, 2007, granted, now 10,660,690.
Prior Publication US 2020/0237426 A1, Jul. 30, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 18/14 (2006.01); A61B 18/12 (2006.01); A61B 18/00 (2006.01); A61B 18/16 (2006.01)
CPC A61B 18/1206 (2013.01) [A61B 18/1492 (2013.01); A61B 2018/00577 (2013.01); A61B 2018/00875 (2013.01); A61B 2018/165 (2013.01)] 19 Claims
OG exemplary drawing
 
1. An electrophysiology catheter system, comprising:
a catheter having an elongated shaft configured for intra-cardiac use and having a proximal end and a distal end, a first electrode disposed at said distal end, a second electrode proximal of said first electrode, wherein said second electrode comprises a ring electrode, a first sense lead electrically connected to said first electrode and extending through said shaft to said proximal end, and a second sense lead, different from said first sense lead, electrically connected to said second electrode and extending through said shaft to said proximal end;
an excitation signal source coupled to said catheter configured to produce an excitation signal comprising an electrical current proximate said first electrode;
a sense circuit coupled to said first and second electrodes by way of said first and second sense leads configured to measure a response signal induced by said excitation signal as observed across said first and second electrodes; and
a processing circuit configured to process said response signal, based on the excitation signal, to determine an impedance of a cardiac tissue volume proximate said first electrode to treat a cardiac arrhythmia.