Harikrishna S Tandri

20230011001, Jan 12, 2023

Dec 2, 2020

17/781503

- Baltimore MD, US
Ronald D. BERGER - Baltimore MD, US
Natalia A. TRAYANOVA - Baltimore MD, US
Shijie ZHOU - Baltimore MD, US
Harikrishna TANDRI - Ellicott City MD, US

G16H 20/40

A system and method are provided for a navigational feedback to a catheter during an arrhythmia ablation procedure. A set of electrocardiogram (ECG) signals of a patient's arrhythmia is recorded that correspond to an unknown target location to be ablated by the catheter. During the ablation procedure, pacing locations and ECG signals corresponding to the pacing locations are collected to derive a mathematical operator that maps a 12-dimensional displacement vector in the ECG space to a 3-dimensional (3D) vector in a physical space. This 3D vector corresponds to a direction and a distance that the catheter needs to be moved in order to reach the target location of the arrhythmia.

20200086130, Mar 19, 2020

Dec 8, 2017

16/467373

- Baltimore MD, US
Ehud J. Schmidt - Boston MA, US
Ronald D. Watkins - Stanford CA, US
Harikrishna Tandri - Ellicott City MD, US
David Hunter - Baltimore MD, US
Leslie Tung - Columbia MD, US
Ronald D. Berger - Baltimore MD, US

The Johns Hopkins University - Baltimore MD

A61N 1/39
A61B 5/055

A magnetic-resonance-imaging-compatible (MRI-compatible) cardiac defibrillator includes: a defibrillator generator; first and second electric wires, each being electrically connected to said defibrillator generator; first and second defibrillation pads, each being electrically connected to a respective one of said first and second electric wires; and a low pass filter electrically connected between said defibrillator generator and said first and second electric wires to prevent a noise in an MRI image caused by a radiofrequency interference from the defibrillator as well as protect a patient and the defibrillator from MRI radiofrequency imaging signals, wherein said low pass filter has a cutoff frequency set such that differential mode noise at an MRI Larmor frequency is in an attenuated band while a system-test signal by said defibrillator generator is in a pass band of said low pass filter.

20150321021, Nov 12, 2015

Jan 23, 2014

14/162604

Harikrishna Tandri - Ellicott MD, US
Ronald David Berger - Baltimore MD, US
Seth Weinberg - Williamsberg VA, US
Leslie Tung - Baltimore MD, US
Natalia Trayanova - Baltimore MD, US

THE JOHNS HOPKINS UNIVERSITY - Baltimore MD

A61N 1/39
A61N 1/365
A61N 1/06
A61N 1/362

The present invention provides both methods and devices for termination of arrhythmias, such as ventricular or atrial tachyarrhythmias. The device and method involves application of alternating current (AC) for clinically significant durations at selected therapeutic frequencies through the cardiac tissue to a subject experiencing arrhythmia. Methods are also provided to minimize or eliminate pain during defibrillation.