Sam Wai Ho

US Patent:

7918848, Apr 5, 2011

Filed:

Mar 25, 2005

Appl. No.:

11/090330

Inventors:

Liming Lau - Mountain View CA, US
Arnold M. Escano - Santa Clara CA, US
Jerry Jarrard - Sunnyvale CA, US
Sam Ho - Fremont CA, US
Ryan C. Abbott - San Jose CA, US
Arthur M. Lin - Fremont CA, US
Jesse McQuiston - Palo Alto CA, US
Peter L. Callas - Castro Valley CA, US
Geoffrey H. Willis - Redwood City CA, US
Michael C. Stewart - San Jose CA, US
Kimberly D. Barkman - Redwood City CA, US
Joseph N. Lamberti - Castro Valley CA, US
Kenny L. Dang - San Jose CA, US

Assignee:

Maquet Cardiovascular, LLC - San Jose CA

International Classification:

A61B 18/04

US Classification:

606 29

Abstract:

A surgical apparatus and methods for severing and welding tissue, in particular blood vessels, include a pair of relatively movable jaws at a distal end of an elongated shaft. A first heating element on one of the jaws is adapted to heat up to a first temperature and form a welded region within the tissue, while a second heating element on one of the jaws is adapted to heat up to a second temperature and sever the tissue within the welded region. A force-limiting mechanism is provided to limit the pressure applied to the tissue by the jaws to ensure that the tissue is severed and the ends effectively welded within a short amount of time.

US Patent:

20060217706, Sep 28, 2006

Filed:

Mar 25, 2005

Appl. No.:

11/090750

Inventors:

Liming Lau - Mountain View CA, US
Arnold Escano - Santa Clara CA, US
Jerry Jarrard - Sunnyvale CA, US
Sam Ho - Fremont CA, US
Ryan Abbott - San Jose CA, US
Arthur Lin - Fremont CA, US
Jesse McQuiston - Palo Alto CA, US
Peter Callas - Castro Valley CA, US
Geoffrey Willis - Redwood City CA, US
Michael Stewart - San Jose CA, US
Kimberly Barkman - Redwood City CA, US
Joseph Lamberti - Castro Valley CA, US
Kenny Dang - San Jose CA, US

International Classification:

A61B 18/18

US Classification:

606045000

Abstract:

A surgical apparatus and methods for severing and welding tissue, in particular blood vessels. The apparatus includes an elongated shaft having a pair of relatively movable jaws at a distal end thereof. A first heating element on one of the jaws is adapted to heat up to a first temperature and form a welded region within the tissue, while a second heating element on one of the jaws is adapted to heat up to a second temperature and sever the tissue within the welded region. The first and second heating elements may be provided on the same or opposite jaws. A control handle provided on the proximal end of the elongated shaft includes controls for opening and closing the jaws, and may include an actuator for sending current through the first and second heating elements. The first and second heating elements may be electrically connected in series, and the first heating element may be bifurcated such that it conducts about one half of the current as the second heating element. A force-limiting mechanism provided either within the control handle, in the elongated shaft, or at the jaws limits the pressure applied to the tissue by the jaws to ensure that the tissue is severed and the ends effectively welded within a short amount of time.

US Patent:

20110257643, Oct 20, 2011

Filed:

Mar 14, 2011

Appl. No.:

13/047778

Inventors:

Liming Lau - Mountain View CA, US
Arthur M. Lin - Fremont CA, US
Sam Ho - Fremont CA, US
Ryan C. Abbott - San Jose CA, US
Kenny L. Dang - San Jose CA, US
Jesse McQuiston - Palo Alto CA, US
Peter L. Callas - Castro Valley CA, US
Arnold M. Escano - Santa Clara CA, US
Michael C. Stewart - San Jose CA, US
Jerry Jarrard - Sunnyvale CA, US
Joseph N. Lamberti - Castro Valley CA, US
Justin N. Williams - San Jose CA, US
Kristopher Yee - San Jose CA, US

Assignee:

MAQUET CARDIOVASCULAR LLC - San Jose CA

International Classification:

A61B 18/04

US Classification:

606 28

Abstract:

A surgical apparatus and methods for severing and welding tissue, in particular blood vessels. The apparatus includes an elongated shaft having a pair of relatively movable jaws at a distal end thereof. A first heating element on one of the jaws is adapted to heat up to a first temperature and form a welded region within the tissue, while a second heating element on one of the jaws is adapted to heat up to a second temperature and sever the tissue within the welded region. The first and second heating elements may be provided on the same or opposite jaws. A control handle provided on the proximal end of the elongated shaft includes controls for opening and closing the jaws, and may include an actuator for sending current through the first and second heating elements. The first and second heating elements may be electrically connected in series, and the first heating element may be bifurcated such that it conducts about one half of the current as the second heating element. A force-limiting mechanism provided either within the control handle, in the elongated shaft, or at the jaws limits the pressure applied to the tissue by the jaws to ensure that the tissue is severed and the ends effectively welded within a short amount of time.