×

Apparatus for measurement of expiration fluids

  • US 4,233,842 A
  • Filed: 10/20/1978
  • Issued: 11/18/1980
  • Est. Priority Date: 10/20/1978
  • Status: Expired due to Term
First Claim
Patent Images

1. A dynamic method for determining rate of expiration of a selected fluid constituent in a mixed flow of expired respiration fluids, comprising the recurring steps of:

  • a. exposing a first sample fraction of the expired fluids to detection means producing a first signal which is a function of concentration of said selected fluid constituent,b. removing substantially all of said fluid constituent from a second fraction of the expired fluids,c. exposing said second fraction to detection means producing a second signal which is a function of concentration of the selected fluid constituent,d. comparing said first and second signals,e. replenishing said second fraction of expired fluids with resupply of said fluid constituent at a sufficient flow rate to equalize the compared signals of the previous step, andf. monitoring the flow rate to provide data for determining said rate of expiration.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×