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Title: US6279569: Determination of leak and respiratory airflow
[ Derwent Title ]

Country: US United States of America

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20 pages

 
Inventor: Berthon-Jones, Michael; Leonay, Australia

Assignee: ResMed Limited, North Ryde, Australia
other patents from RESMED LIMITED, AN AUSTRALIAN COMPANY (739811) (approx. 102)
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Published / Filed: 2001-08-28 / 2000-03-14

Application Number: US2000000525042
IPC Code: Advanced: A61M 16/00;
IPC-7: A61M 15/00;

ECLA Code: A61M16/00M; A61M16/00; K61M16/00A8B2; K61M16/00A14B2; K61M16/00M6P; K61M205/15;

U.S. Class: Current: 128/200.24; 128/204.23;
Original: 128/200.24; 128/204.23;

Field of Search: 128/204.18,204.21,204.23,204.26,205.23,200.24,203.12,207.14

Priority Number:
1996-08-14  AU1996000001638

Abstract:     Methods and apparatus for determining leak and respiratory airflow are disclosed. A pressure sensor (34) and a differential pressure sensor (32) have connection with a pneumotach (24) to derive instantaneous mask pressure and airflow respectively. A microcontroller (38) estimates a non-linear conductance of any leak path occurring at a mask (12) as being the low pass filtered instantaneous airflow divided by the low pass filtered square root of the instantaneous pressure. The instantaneous leak flow is then the conductance multiplied by the square root of the instantaneous pressure, and the respiratory airflow is calculated as being the instantaneous airflow minus the instantaneous leak flow. The time constants for the low pass filtering performed by the microcontroller (38) can be dynamically adjusted dependent upon sudden changes in the instantaneous leak flow.

Attorney, Agent or Firm: Gottlieb, Rackman & Reisman, PC ;

Primary / Asst. Examiners: Lewis, Aaron J.; Mitchell, Teena
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Related Applications: Go to Result Set: 4 patent(s) that list this one as related
Application Number Filed Patent Pub. Date  Title
US1997000911513 1997-08-14    2000-11-28  Determination of leak and respiratory airflow


       
Parent Case:     This Application is a Continuation Application of U.S. patent application Ser. No. 08/911,513 for DETERMINATION OF LEAK AND RESPIRATORY AIRFLOW, filed Aug. 14, 1997, now U.S. Pat. No. 6,152,129.

Designated Country: AL AM AP AZ BA BB BG BR BY CA CN CU CZ EE GE GH HU IL IS KE KG KP KR KZ LC  AT BE CH DE DK ES FI FR GB GR IE IT 

Family: Show 90 known family members
First Claim:
Show all 33 claims		 What is claimed is:     1. A method for determining the instantaneous leak flow from a face mask comprising the steps of:
  • (a) determining pairs of values for pressure in the mask and airflow through the mask;
  • (b) calculating the conductance of a leak as a function of pairs of values for pressure and airflow that are determined over a time interval that exceeds a normal breath; and
  • (c) calculating the instantaneous leak flow as a function of the calculated leak conductance and an instantaneous determined value of mask pressure.
    •


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Forward References: Show 22 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (22)   |   Backward references (218)   |   Citation Link

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    • Continuity Data:
    Application Number Filed Notes
    US2000000525042 2000-03-14  is a related to the prior publication
         US20040074492A1 issued 2004-04-22  Determination of leak and respiratory airflow
    US2000000525042 2000-03-14  is a related to the prior publication
         US20060005835A1 issued 2006-01-12  Determination of leak and respiratory airflow
    12649877   is a continuation of
    US2005000223237  2005-09-08
         US7661428 issued 2010-02-16   Determination of leak and respiratory airflow
    US2005000223237 2005-09-08  is a continuation of
    US2003000726114  2003-12-01   (granted)
         US6945248 issued 2005-09-20   Determination of leak and respiratory airflow
    11223237   is a continuation of
    US2003000726114  2003-12-01
         US6945248 issued 2005-09-20   Determination of leak and respiratory airflow
    US2003000726114 2003-12-01  is a continuation of
    US2001000902011  2001-07-10   (granted)
         US6659101 issued 2003-12-09   Determination of leak and respiratory airflow
    US2003000726114   is a continuation of
    US2001000902011  2001-07-10
         US6659101 issued 2003-12-09   Determination of leak and respiratory airflow
    US2001000902011 2001-07-10  is a continuation of
    >US2000000525042<  2000-03-14   (granted)
         US6279569 issued 2001-08-28   Determination of leak and respiratory airflow
    US2001000902011 2001-07-10  is a continuation of
    >US2000000525042<  2000-03-14   (patented) [presumed granted]
         US6279569 issued 2001-08-28   Determination of leak and respiratory airflow
    US2001000902011   is a continuation of
    >US2000000525042<  2000-03-14
         US6279569 issued 2001-08-28   Determination of leak and respiratory airflow
    >US2000000525042< 2000-03-14  is a continuation of
    US1997000911513  1997-08-14   (granted)
         US6152129 issued 2000-11-28   Determination of leak and respiratory airflow
    >US2000000525042< 2000-03-14  is a continuation of
    US1997000911513  1997-08-14   (patented) [presumed granted]
         US6152129 issued 2000-11-28   Determination of leak and respiratory airflow
    >US2000000525042<   is a continuation of
    US1997000911513  1997-08-14
         US6152129 issued 2000-11-28   Determination of leak and respiratory airflow


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