Ravikumar V Kudaravalli

US Patent:

RE40815, Jun 30, 2009

Filed:

Oct 1, 2007

Appl. No.:

11/865640

Inventors:

Ravikumar V. Kudaravalli - Pleasanton CA, US
Hong Li - Jilin, CN

Assignee:

AMS Research Corporation - Minnetonka MN

International Classification:

A61B 18/18

US Classification:

606 21, 62293, 606 22

Abstract:

An apparatus and method for automatic operation of a refrigeration system to provide refrigeration power to a catheter for tissue ablation or mapping. The primary refrigeration system can be open loop or closed loop, and a precool loop will typically be closed loop. Equipment and procedures are disclosed for bringing the system to the desired operational state, for controlling the operation by controlling refrigerant flow rate, for performing safety checks, and for achieving safe shutdown.

US Patent:

RE40868, Aug 11, 2009

Filed:

Oct 1, 2007

Appl. No.:

11/865686

Inventors:

Eric Ryba - San Bruno CA, US
David J. Lentz - La Jolla CA, US
Ravikumar Kudaravalli - Pleasanton CA, US
Hong Li - Jilin, CH

Assignee:

CryoCor, Inc. - San Diego CA

International Classification:

A61B 18/18

US Classification:

606 20, 606 22, 606 24

Abstract:

A catheter-based system for performing a cryoablation procedure uses a precooler to lower the temperature of a fluid refrigerant to a sub-cool temperature (−40 C. ) at a working pressure (400 psi). The sub-cooled fluid is then introduced into a supply line of the catheter. Upon outflow of the primary fluid from the supply line, and into a tip section of the catheter, the fluid refrigerant boils at an outflow pressure of approximately one atmosphere, at a temperature of about −88 C. In operation, the working pressure is computer controlled to obtain an appropriate outflow pressure for the coldest possible temperature in the tip section.

US Patent:

20090241953, Oct 1, 2009

Filed:

Mar 30, 2009

Appl. No.:

12/414430

Inventors:

Joseph Douglas Vandine - Newark CA, US
Steve Vuong - Vista CA, US
Iqbal Shahid - Mountain View CA, US
Ravikumar V. Kudaravalli - Manassas VA, US

Assignee:

Nellcor Puritan Bennett LLC - Boulder CO

International Classification:

A61M 16/12

US Classification:

12820421, 12820518, 12820511

Abstract:

A mechanical ventilator is provided with a piston-cylinder for performing an air displacement function and a buffer volume and associated output valve for providing an air metering function. The piston-cylinder may comprise a reciprocating arrangement, in which compressed air is supplied to the buffer volume with each stroke of the piston.