Dennis P Witz

US Patent:

20040236242, Nov 25, 2004

Filed:

May 22, 2003

Appl. No.:

10/443696

Inventors:

James Graham - Swampscott MA, US
Robert O'Leary - Newton MA, US
Dennis Witz - Georgetown MA, US
David Vidal - Amesbury MA, US

International Classification:

A61B005/08

US Classification:

600/532000

Abstract:

A capnograph system sensor head includes an airway adapter, a housing for receiving the airway adapter, a source of infrared radiation coupled to the housing for directing infrared radiation through the airway adapter, and a detector subsystem coupled to the housing and responsive to the infrared radiation after it passes through the airway adapter for providing an analog output. A circuit sub-assembly is integrated with the sensor head and includes a controller responsive to the analog output of the detector subsystem. The controller is configured to adjust the gain of the detector subsystem to output a digital signal representative of the amount of a particular gas flowing through the airway adapter.