Michael L Yang

US Patent:

8449537, May 28, 2013

Filed:

Dec 29, 2006

Appl. No.:

11/618692

Inventors:

Hong Cao - Savage MN, US
Xiaoping Guo - Eden Prairie MN, US
Isaac Shai - Springfield NJ, US
Michael Yang - Thousand Oaks CA, US
Kedar Ravindra Belhe - Minnetonka MN, US
Saurav Paul - Minnetonka MN, US
Chou Thao - Brooklyn Park MN, US

Assignee:

St. Jude Medical, Atrial Fibrillation Division, Inc. - St. Paul MN

International Classification:

A61B 18/18

US Classification:

606 41, 606 32

Abstract:

An ablation catheter is provided for ablating internal tissue of a patient. The catheter includes a distal end that is adapted to be inserted into a body cavity relative to a desired location therein (e. g. , within the heart). An ablation electrode is connected relative to the distal end of the catheter for providing ablation energy to patient tissue. A heat sink is provided that is in thermal contact with the ablation electrode. The heat sink, in addition to being in thermal contact with the ablation electrode, is electrically isolated from the ablation electrode. This allows the heat sink to conduct heat away from the ablation electrode without dissipating electrical energy from the electrode. In this regard, the heat sink may prevent build-up of excess heat within the electrode that may result in blood coagulation and/or tissue charring.

US Patent:

8478388, Jul 2, 2013

Filed:

Apr 6, 2010

Appl. No.:

12/755359

Inventors:

Thao Thu Nguyen - Bloomington MN, US
Kjell Norén - Solna, SE
Allen Keel - San Francisco CA, US
Kyungmoo Ryu - Palmdale CA, US
Stuart Rosenberg - Castaic CA, US
Wenbo Hou - Lancaster CA, US
Steve Koh - South Pasadena CA, US
Michael Yang - Thousand Oaks CA, US

Assignee:

Pacesetter, Inc. - Sylmar CA

International Classification:

A61N 1/00
A61B 5/04

US Classification:

600509, 600508, 607 16, 607 17

Abstract:

An exemplary method includes accessing cardiac information acquired via a catheter located at various positions in a venous network of a heart of a patient wherein the cardiac information comprises position information with respect to time for one or more electrodes of the catheter; performing a principal component analysis on at least some of the position information; and selecting at least one component of the principal component analysis to represent an axis of a cardiac coordinate system. Various other methods, devices, systems, etc. , are also disclosed.

US Patent:

20130338663, Dec 19, 2013

Filed:

May 24, 2013

Appl. No.:

13/902422

Inventors:

Xiaoping Guo - Eden Prairie MN, US
Yitzhak I. Shai - Springfield NJ, US
Michael Yang - Thousand Oaks CA, US
Kedar Ravindra Belhe - Minnetonka MN, US
Saurav Paul - Minneapolis MN, US
Riki Chou Thao - Maplewood MN, US

International Classification:

A61B 18/14

US Classification:

606 41

Abstract:

An ablation catheter is provided for ablating internal tissue of a patient. The catheter includes a distal end that is adapted to be inserted into a body cavity relative to a desired location therein (e.g., within the heart). An ablation electrode is connected relative to the distal end of the catheter for providing ablation energy to patient tissue. A heat sink is provided that is in thermal contact with the ablation electrode. The heat sink, in addition to being in thermal contact with the ablation electrode, is electrically isolated from the ablation electrode. This allows the heat sink to conduct heat away from the ablation electrode without dissipating electrical energy from the electrode. In this regard, the heat sink may prevent build-up of excess heat within the electrode that may result in blood coagulation and/or tissue charring.

US Patent:

20170119453, May 4, 2017

Filed:

Dec 7, 2016

Appl. No.:

15/371268

Inventors:

- St. Paul MN, US
Thao T. Ngo - Shakopee MN, US
Euljoon Park - Valencia CA, US
Stuart Rosenberg - Castaic CA, US
Allen Keel - San Francisco CA, US
Wenbo Hou - Valencia CA, US
Steve Koh - South Pasadena CA, US
Kjell Noren - SoIna, SE
Michael Yang - Thousand Oaks CA, US

International Classification:

A61B 18/12
A61B 34/20
A61B 18/14

Abstract:

A system and method for treating an arrhythmia in a heart are provided. The system includes an electronic control unit configured to monitor movement of one or more position sensor over a period of time. The position sensors may, for example, comprise electrodes or coils configured to generate induced voltages and currents in the presence of electromagnetic fields, The positions sensors are in contact with portions of heart tissue and changes in position are representative of motion of that tissue. The electronic control unit is further configured to generate an indicator, responsive to the movements of the sensors over the period of time, of a characteristic of the heart affected by delivery of ablation energy to heart tissue. In this manner, the effectiveness and safety of cardiac tissue ablation for treatment of the arrhythmia can be assessed and a post-ablation therapy regimen determined.

US Patent:

20160242805, Aug 25, 2016

Filed:

Feb 18, 2016

Appl. No.:

15/047174

Inventors:

- New Brighton MN, US
Brad J. Martinsen - St. Louis Park MN, US
Michael X. Yang - Maple Grove MN, US
Yihao Zheng - Ann Arbor MI, US
Albert Shih - Ann Arbor MN, US
Rohit Deokar - Minneapolis MN, US

International Classification:

A61B 17/32
A61B 17/3207

Abstract:

The present system is directed in various embodiments to rotational atherectomy systems and methods generally. More specifically, a method for methodically softening and otherwise disrupting calcification located within atherosclerotic plaque, lesion or occlusion and/or within the wall of a biological conduit or lumen. For example, calcification within the occlusion and/or intimal and/or medial layer walls of a blood vessel, e.g., an artery, may be methodically softened or otherwise disrupted with various embodiments of the present invention. The softening and/or disruption of the calcification in the walls of the exemplary artery is accomplished in conjunction with abrading removal of any occlusion located on the interior surface of the exemplary artery and, therefore, located within the artery's lumen. This result is achieved by use of at least one eccentric head that, during high-speed rotation within the exemplary lumen, has been found to produce a combination of a low-frequency orbital motion comprising a force that is exerted against the lumen wall, with concomitant deflection of same, and/or a high-frequency pulsatile frequency, also with concomitant exertion of force against the lumen wall and deflection of same. These force-driven deflections produce a series of shockwaves within the layers of the exemplary artery's wall layers, resulting in systematic disruptions of any calcification within the intimal and/or medial layers of the subject artery. In addition, any calcification within the occlusion is also softened and disrupted. Thus, as this process proceeds, the compliance of the vessel, as well as the lesion itself, is increased.

US Patent:

20140343649, Nov 20, 2014

Filed:

Jul 31, 2014

Appl. No.:

14/448739

Inventors:

- Sylmar CA, US
Thao Ngo - Shakopee MN, US
Kyungmoo Ryu - Palmdale CA, US
Kjell Noren - Solna, SE
Allen Keel - San Francisco CA, US
Wenbo Hou - Santa Clarita CA, US
Steve Koh - South Pasadena CA, US
Michael Yang - Thousand Oaks CA, US

International Classification:

A61N 1/05

US Classification:

607116

Abstract:

An exemplary method includes positioning a lead in a patient where the lead has a longitudinal axis that extends from a proximal end to a distal end and where the lead includes an electrode with an electrical center offset from the longitudinal axis of the lead body; measuring electrical potential in a three-dimensional potential field using the electrode; and based on the measuring and the offset of the electrical center, determining lead roll about the longitudinal axis of the lead body where lead roll may be used for correction of field heterogeneity, placement or navigation of the lead or physiological monitoring (e.g., cardiac function, respiration, etc.). Various other methods, devices, systems, etc., are also disclosed.

US Patent:

20140343650, Nov 20, 2014

Filed:

Jul 31, 2014

Appl. No.:

14/448802

Inventors:

- Sylmar CA, US
Thao Ngo - Shakopee MN, US
Kyungmoo Ryu - Palmdale CA, US
Kjell Noren - Solna, SE
Allen Keel - San Francisco CA, US
Wenbo Hou - Santa Clarita CA, US
Steve Koh - South Pasadena CA, US
Michael Yang - Thousand Oaks CA, US

International Classification:

A61N 1/05

US Classification:

607116

Abstract:

An exemplary method includes positioning a lead in a patient where the lead has a longitudinal axis that extends from a proximal end to a distal end and where the lead includes an electrode with an electrical center offset from the longitudinal axis of the lead body; measuring electrical potential in a three-dimensional potential field using the electrode; and based on the measuring and the offset of the electrical center, determining lead roll about the longitudinal axis of the lead body where lead roll may be used for correction of field heterogeneity, placement or navigation of the lead or physiological monitoring (e.g., cardiac function, respiration, etc.). Various other methods, devices, systems, etc., are also disclosed.

US Patent:

20140343651, Nov 20, 2014

Filed:

Jul 31, 2014

Appl. No.:

14/448833

Inventors:

- Sylmar CA, US
Thao Ngo - Shakopee MN, US
Kyungmoo Ryu - Palmdale CA, US
Kjell Noren - Solna, SE
Allen Keel - San Francisco CA, US
Wenbo Hou - Santa Clarita CA, US
Steve Koh - South Pasadena CA, US
Michael Yang - Thousand Oaks CA, US

International Classification:

A61N 1/05

US Classification:

607116

Abstract:

An exemplary method includes positioning a lead in a patient where the lead has a longitudinal axis that extends from a proximal end to a distal end and where the lead includes an electrode with an electrical center offset from the longitudinal axis of the lead body; measuring electrical potential in a three-dimensional potential field using the electrode; and based on the measuring and the offset of the electrical center, determining lead roll about the longitudinal axis of the lead body where lead roll may be used for correction of field heterogeneity, placement or navigation of the lead or physiological monitoring (e.g., cardiac function, respiration, etc.). Various other methods, devices, systems, etc., are also disclosed.