US3602214A
Expired / Lapsed
US
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Method of phantom level sensing in a central venous pressure monitoring system
Assignee: Individual
•
Filing: 1969-09-23
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Granted: 1971-08-31
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Expires: 1989-09-23
Abstract
Abstract Method of sensing phantom level in central venous pressure monitoring systems of the type supporting liquid in column relatively to the right atrial chamber of the heart. The method includes projecting of a reference light beam from the liquid column gravimetric zero reference point to the right atrial chamber gravimetric zero point referenced on the patient''s thorax. The light beam shining upon the thorax enables readjusting of the height of the liquid column, accordingly as the reference beam is projected above or below the referenced point on the thorax.
Inventors
- 👤 Seymour B London
- 👤 Rose E London
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:40
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/021; A61B5/0215; A61B5/02152
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
Method of phantom level sensing in a central venous pressure monitoring system comprising: A. supporting liquid in vertical column by means of central venous pressure; B. projecting a zero reference light beam from the foot of said column and onto a patient''s chest wall adjacent the right atrial cardiac chamber as an index of the height of said liquid in vertical column with respect to the right atrial cardiac chamber; C. transmitting light through said column and said liquid; D. discriminately sensing that light which has been transmitted through the liquid; and E. monitoring venous pressure as a function of the level of liquid in said column through which light is transmitting.
Claim 2
Dependent Claim
112 words
Method of phantom level sensing in a central venous pressure monitoring system comprising: A. supporting liquid in vertical column by means of central venous pressure; B. projecting a zero reference light beam from the foot of said column and onto a patient''s chest wall adjacent the right atrial cardiac chamber as an index of the height of said liquid in vertical column with respect to the right atrial cardiac chamber; C. transmitting light through said column and said liquid; D. discriminately sensing that light which has been transmitted through the liquid; and E. monitoring venous pressure as a function of the level of liquid in said column through which light is transmitting.
Claim 3
Dependent Claim
122 words
Method of phantom level sensing in a central venous pressure monitoring system comprising: A. supporting liquid in vertical column by means of central venous pressure; B. making the patient''s thorax as an external reference point corresponding to the right atrial cardiac chamber; C. projecting a zero reference light beam from the foot of said column and onto the reference point, as an index of the height of said liquid in vertical column with respect to the right atrial cardiac chamber; D. transmitting light through said column and said liquid; E. discriminately sensing that light which has been transmitted through the liquid; and F. monitoring venous pressure as a function of the level of liquid in said column through which light is transmitting.
Claim 4
Dependent Claim
122 words
Method of phantom level sensing in a central venous pressure monitoring system comprising: A. supporting liquid in vertical column by means of central venous pressure; B. making the patient''s thorax as an external reference point corresponding to the right atrial cardiac chamber; C. projecting a zero reference light beam from the foot of said column and onto the reference point, as an index of the height of said liquid in vertical column with respect to the right atrial cardiac chamber; D. transmitting light through said column and said liquid; E. discriminately sensing that light which has been transmitted through the liquid; and F. monitoring venous pressure as a function of the level of liquid in said column through which light is transmitting.
Claim 5
Dependent Claim
52 words
Method of phantom sensing in a central venous pressure monitoring system as in claim 2 including: G. vertically repositioning said column relatively to the difference in height between said light beam and said external reference point corresponding to the right atrial cardiac chamber, as the position of the patient may be Changed.
Claim 6
Dependent Claim
39 words
Method of phantom level sensing in a central venous pressure monitoring system as in claim 2, wherein the gravimetric zero of the liquid in column coincides with the foot of said column and is equal to right atrial pressure.
Claim 7
Dependent Claim
48 words
Method of phantom level sensing in a central venous pressure monitoring system as in claim 4 including: H. supporting said liquid in column intermediate a series of vertically disposed light sources and a corresponding series of vertically disposed photosensing cells, corresponding to gravimetric pressure levels in said column.
Claim 8
Dependent Claim
37 words
Method of phantom level sensing in a central venous pressure monitoring system as in claim 3 including focusing while projecting said zero reference light beam, so as to define said light beam upon the thorax reference point.
Claim 9
Dependent Claim
26 words
Method of phantom level sensing in a central venous pressure monitoring system as in claim 5 including: I. shielding of said liquid column from ambient light.
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) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |