US5349519A
Expired / Lapsed
US
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Method for digitally processing signals containing information regarding arterial blood flow
Assignee: Philips North America LLC
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Filing: 1993-11-12
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Granted: 1994-09-20
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Expires: 2013-11-12
Abstract
Abstract A method for digitally processing signals containing information regarding arterial blood flow in a living body is disclosed enabling a more accurate determination of the oxygen saturation. The method comprises the steps of identifying a first edge based on a first derivation of the signal, disregarding same if it does not fulfill certain criteria, determining a window based on said identified first edge, identifying the second edge falling within said window, disregarding same if it does not fulfill certain criteria, and replacing the second edge by the first before repeated these steps.
Inventors
- 👤 Siegfried Kaestle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:44
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/14551; A61B5/72; A61B5/7235; A61B5/7239
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
92 words
A method for identifying acceptable systolic edges in a blood pressure signal derived from a patient comprising: identifying as a first systolic edge a portion of the signal meeting criteria for at least one feature including the maximum absoluted value of a first derivative; determining value windows for respective features including those with wide variations only from the values of the features in said first systolic edge; and determining whether a subsequent portion of said signal passes through said value windows; and identifying it as being an acceptable edge if it does.
Claim 2
Independent Claim
92 words
A method for identifying acceptable systolic edges in a blood pressure signal derived from a patient comprising: identifying as a first systolic edge a portion of the signal meeting criteria for at least one feature including the maximum absoluted value of a first derivative; determining value windows for respective features including those with wide variations only from the values of the features in said first systolic edge; and determining whether a subsequent portion of said signal passes through said value windows; and identifying it as being an acceptable edge if it does.
Claim 3
Independent Claim
97 words
A method for identifying acceptable systolic edges in a blood pressure signal derived from a patent comprising: identifying as a first systolic edge a portion of the signal meeting criteria for at least one feature including the maximum absolute value of a first derivative; determining value windows for the respective features including those with wide variations from their values int he first systolic edge and excluding their values in previous systolic edges; and determining whether a subsequent portion of said signal passes through said value windows; and identifying it as being an acceptable edge if it does.
Claim 4
Independent Claim
97 words
A method for identifying acceptable systolic edges in a blood pressure signal derived from a patent comprising: identifying as a first systolic edge a portion of the signal meeting criteria for at least one feature including the maximum absolute value of a first derivative; determining value windows for the respective features including those with wide variations from their values int he first systolic edge and excluding their values in previous systolic edges; and determining whether a subsequent portion of said signal passes through said value windows; and identifying it as being an acceptable edge if it does.
Claim 5
Independent Claim
83 words
A method for identifying acceptable systolic edges in a blood pressure signal derived from a patient comprising: identifying as a first systolic edge a portion of the signal meeting criteria for at least one features; determining value windows for respective features including those with wide variation only from the values of the features in said first systolic edge; and determining whether a subsequent portion of said signal passes through said value windows; and identifying it as being an acceptable edge if it does.
Claim 6
Independent Claim
83 words
A method for identifying acceptable systolic edges in a blood pressure signal derived from a patient comprising: identifying as a first systolic edge a portion of the signal meeting criteria for at least one features; determining value windows for respective features including those with wide variation only from the values of the features in said first systolic edge; and determining whether a subsequent portion of said signal passes through said value windows; and identifying it as being an acceptable edge if it does.
Claim 7
Independent Claim
74 words
A method for identifying acceptable systolic edges in a blood pressure signal derived from a patient comprising: identifying as a first systolic edge a portion of the signal meeting criteria for at least one feature including the maximum absolute value of a first derivative; determining value windows for respective features including those with wide variations from the values of the features in said first systolic edge but not from values in previous systolic edges.
Claim 8
Independent Claim
74 words
A method for identifying acceptable systolic edges in a blood pressure signal derived from a patient comprising: identifying as a first systolic edge a portion of the signal meeting criteria for at least one feature including the maximum absolute value of a first derivative; determining value windows for respective features including those with wide variations from the values of the features in said first systolic edge but not from values in previous systolic edges.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |