Arrangement for passive gas sampling

• US 20040094155A1
• Filed: 10/16/2003
• Published: 05/20/2004
• Est. Priority Date: 11/20/2002
• Status: Abandoned Application

• Current Assignee: Maquet Critical Care AB (Getinge AB)
• Original Assignee: Siemens-Elema AB (Siemens AG)
• Inventors: Hallback, Magnus, Castor, Rolf
• Application Number:
  US10/687,312
• Publication Number:
  US 20040094155A1
• Time in Patent Office: Days
• US Class Current: 128/204.22
• CPC Class Codes: A61B 5/097 Devices for facilitating collection of breath or for directing breath into or through measuring devices
• CPC Class Codes: A61M 16/127 by Venturi effect, i.e. entrainment mixers
• CPC Class Codes: G01F 1/44 Venturi tubes
• CPC Class Codes: G01F 5/00 Measuring a proportion of the volume flow

Abstract

An arrangement for passive gas sampling in a breathing system has a conduit having a venturi-nozzle for passively generating pressure variations in the conduit dependent on a flow of breathing gas in the conduit, and a first port and a second port terminating in the conduit and connected to a measurement chamber. The first port and the second port are arranged relative to the venturi-nozzle such that the pressure variations force a flow of breathing gas through the first port into the measurement chamber and out through the second port.

Claims

1. An arrangement for passive gas sampling in a breathing system, comprising:

a body element having a conduit therein adapted to receive a flow of breathing gas;

a measurement chamber associated with said body element;

a venturi-nozzle in said conduit for passively generating pressure variations in said conduit dependent on said flow of breathing gas in said conduit;

said body element having a first port and a second port each terminating in said conduit and each connected to said measurement chamber; and

said first port and said second port being disposed relative to said venturi-nozzle so that said pressure variations force a flow of said breathing gas through said first port into said measurement chamber and out through said second port.