US Patent No: 4,269,194

Number of patents in Portfolio can not be more than 2000

Carbon dioxide measurement from expired gases in a partial rebreathing anesthesia circuit

Stats

ATTORNEY / AGENT: (SPONSORED)
 

Importance

Loading Importance Indicators... loading....

Abstract

A method of determining arterial carbon dioxide tension from mixed expired gases of a patient utilizing a partial rebreathing anesthesia circuit. An electrode is inserted into expired gases of a patient to measure expired carbon dioxide tension. An output signal from the electrode, which indicates expired carbon dioxide tension, has a very high impedance. By reducing the impedance of the output signal, a more usable signal is obtained. Also, the signal must be converted to a relatively linear function, which is then scaled to give a visual indication proportionate to the arterial carbon dioxide tension. The electrode is pre-calibrated by gases having known percentages of carbon dioxide. The scaling factor is included to compensate for differences between the expired carbon dioxide tension and arterial carbon dioxide tension.

Loading the Abstract Image... loading....

First Claim

Related Publications

Loading Related Publications... loading....

Patent Owner(s)

  • Assignment data not available. Check USPTO

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Elbel, Charles R 632 Ogden La., San Antonio, TX 78209 1 22
Rayburn, Robert L 669 12th Ave., Salt Lake City, UT 84103 6 249
Schweickardt, Karl W San Antonio, TX 2 28
Watson, Robert L North Elmsley Township, Rideau Ferry, Ontario, CA 21 617

Cited Art

  • No Cited Art to Display

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
MEDLIS CORP. (7)
5,983,896 Respiratory conduit for a unilimb respiratory device 38 1998
6,003,511 Respiratory circuit terminal for a unilimb respiratory device 34 1998
5,983,891 Artificial ventilation methods for controlling carbon dioxide rebreathing 26 1998
5,983,894 Filter for a unilimb rebreathing ventilator 18 1998
6,439,231 Artificial ventilation systems and components thereof, and methods for providing, assembling and utilizing same 15 1999
6,564,799 Multilumen filter 12 2001
7,418,965 Multilumen unilimb breathing circuit with detachable proximal fitting 3 2004
 
F-CONCEPTS LLC (4)
6,874,500 Breathing circuits having unconventional respiratory conduits and systems and methods for optimizing utilization of fresh gases 7 2002
7,717,109 Breathing systems with post-inspiratory valve fresh gas flow input, components for implementing same, and methods of use 1 2003
7,261,105 Breathing circuits having unconventional respiratory conduits and systems and methods for optimizing utilization of fresh gases 2 2004
7,275,541 Breathing circuits having unconventional respiratory conduits and systems and methods for optimizing utilization of fresh gases 1 2004
 
ORIDION MEDICAL 1987 LTD. (2)
6,428,483 Waveform interpreter for respiratory analysis 28 2000
6,997,880 Waveform interpreter for respiratory analysis 7 2002
 
CARDIOPULMONARY TECHNOLOGIES, INC. (1)
6,358,215 Infrared gas content analyzing apparatus 14 2000
 
DATEX-OHMEDA, INC. (1)
5,533,512 Method and apparatus for detection of venous air emboli 19 1994
 
KING SYSTEMS CORPORATION (1)
7,178,521 Adjustable length breathing circuit 4 2004
 
MITSUBISHI RAYON CO., LTD. (1)
4,690,147 Method and apparatus for measuring gas partial pressure in living body 4 1986
 
NIHON KOHDEN CORPORATION (1)
5,738,106 Capnometer 14 1996
 
RIC INVESTMENTS, LLC. (1)
8,251,914 Respiratory profile parameter determination method and apparatus 0 2009
 
THE BRIGHAM AND WOMEN'S HOSPITAL, INC. (1)
5,320,093 Rapid anesthesia emergence system using closed-loop PCO.sub.2 control 57 1990
 
THOMAS JEFFERSON UNIVERSITY (1)
5,778,874 Anesthesia machine output monitor 10 1996
 
UNIVERSITY OF FLORIDA RESEARCH FOUNDATION, INC. (1)
5,156,159 CO.sub.2 diagnostic monitor with rupturable container 19 1990