Patent US3590809A successfully refreshed from Google Patents.
US3590809A
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US
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Method for central venous pressure monitoring
Assignee: Individual
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Filing: 1968-03-05
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Granted: 1971-07-06
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Expires: 1988-03-05
Abstract
Abstract Method of central venous pressure monitoring including inserting a catheter in the right atrial cardiac chamber, supporting a vertical column of liquid above said chamber, transmitting light through the column and the liquid, discriminately sensing that light which has been transmitted through the liquid and monitoring central venous pressure as a function of liquid level in the column.
Inventors
- 👤 Seymour B London
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:21
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/0215; A61B5/02152; A61M; A61M5/00; A61M5/14; A61M5/168; A61M5/16831; A61M5/16854; Y; Y10; Y10S; Y10S128/00; Y10S128/13
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
174 words
Method of central venous pressure monitoring comprising: A. Introducing the lower end of a liquid column into the venous area of the patient so that the level of liquid in said column indicates venous pressure; B. Supporting said liquid in vertical column by means of central venous pressure; C. Transmitting light through said column and said liquid by a plurality of independent light sources vertically superposed adjacent one side of said column; D. Discriminately sensing that light which has been transmitted through the liquid via a plurality of independent light sensing elements vertically superposed on the other side of said column; E. Indexing the height of said liquid in vertical column to the right atrial cardiac chamber; and F. Monitoring venous pressure as a function of the level of liquid in said column through which light is transmitting by electrically energizing a visual display of liquid level as a function of venous pressure, said display comprising a plurality of independent lamps superposed in vertical column corresponding to said light sources and light sensing elements.
Claim 2
Dependent Claim
174 words
Method of central venous pressure monitoring comprising: A. Introducing the lower end of a liquid column into the venous area of the patient so that the level of liquid in said column indicates venous pressure; B. Supporting said liquid in vertical column by means of central venous pressure; C. Transmitting light through said column and said liquid by a plurality of independent light sources vertically superposed adjacent one side of said column; D. Discriminately sensing that light which has been transmitted through the liquid via a plurality of independent light sensing elements vertically superposed on the other side of said column; E. Indexing the height of said liquid in vertical column to the right atrial cardiac chamber; and F. Monitoring venous pressure as a function of the level of liquid in said column through which light is transmitting by electrically energizing a visual display of liquid level as a function of venous pressure, said display comprising a plurality of independent lamps superposed in vertical column corresponding to said light sources and light sensing elements.
Claim 3
Dependent Claim
27 words
Method of central venous pressure monitoring as in claim 1, including: K. varying sensing of light relatively to the type of liquid being supported in said column.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |