Patent US2538266A successfully refreshed from Google Patents.
US5271398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intra-vessel measurement of blood parameters
Assignee: Camino NeuroCare Inc
•
Filing: 1991-10-09
•
Granted: 1993-12-21
•
Expires: 2011-10-09
Abstract
Abstract Methods and apparatuses for detecting undesirable wall effect on blood parameter sensors and for moving such sensors to reduce or eliminate said wall effect; and, in one aspect, a sensor with a plurality of spaced apart sensing elements with respect to which wall effect is reduced upon rotation of the sensor.
Inventors
- 👤 Leslie A. Schlain
- 👤 Philip G. Ralston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:38
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/1459
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
158 words
A method for changing disposition of a blood parameter sensor and for reducing or eliminating the effect of wall effect on the sensor, the sensor having at least one sensing element, the at least one sensing element being located in flowing blood in a blood vessel through which blood flows the method comprising detecting and measuring a blood parameter of the flowing blood with the at least one sensing element, compiling a plurality of measurements of the blood parameter over a time period, comparing the measurements to determine whether the blood parameter is changing, moving the at least one sensing element while maintaining it in the flowing blood with nothing between the at least one sensing element and the wall of the blood vessel other than the flowing blood, and moving the at least one sensing element so that wall effect on the at least one sensing element is reduced permitting more accurate measurement of the blood parameter.
Claim 2
Independent Claim
158 words
A method for changing disposition of a blood parameter sensor and for reducing or eliminating the effect of wall effect on the sensor, the sensor having at least one sensing element, the at least one sensing element being located in flowing blood in a blood vessel through which blood flows the method comprising detecting and measuring a blood parameter of the flowing blood with the at least one sensing element, compiling a plurality of measurements of the blood parameter over a time period, comparing the measurements to determine whether the blood parameter is changing, moving the at least one sensing element while maintaining it in the flowing blood with nothing between the at least one sensing element and the wall of the blood vessel other than the flowing blood, and moving the at least one sensing element so that wall effect on the at least one sensing element is reduced permitting more accurate measurement of the blood parameter.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the at least one sensing element is a plurality of two or more sensing elements.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein moving the at least one sensing element is done by rotating the sensor within the blood vessel.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein the blood vessel is an in vivo intracorporeal blood vessel.
Claim 6
Dependent Claim
31 words
The method of claim 1 wherein the at least one sensing element is three sensing elements, including one each for sensing pH, oxygen content and carbon dioxide content of the blood.
Claim 7
Dependent Claim
27 words
The method of claim 2 wherein the sensing elements are in an arc of the sensor when viewed from an end thereof of lens than 180 degrees.
Claim 8
Dependent Claim
30 words
The method of claim 1 wherein there are three sensing elements and they are in an arc of the probe when viewed from an end thereof of about 120 degrees.
Claim 9
Dependent Claim
25 words
The method of claim 1 wherein the sensor has one or more fiber optics in or on which is the at least one sensing element.
References Cited (Backward Citations)
US3123066A
Cited
US3068742A
Cited
US3529591A
Cited
US4478222A
Cited
JPS56124036A
Cited
EP0073558A2
Cited
US4474183A
Cited
EP0126600A2
Cited
US4752115A
Cited
US4682895A
Cited
US4758298A
Cited
US5012809A
Cited
US4813423A
Cited
US4830013A
Cited
US4934369A
Cited
US4951669A
Cited
US4785823A
Cited
EP0352610A2
Cited
US4991590A
Cited
US5195963A
Cited
US5054882A
Cited
US5174299A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-20 | 1997-06-21 | 1997-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-20 | 2001-06-21 | 2001-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-20 | 2005-06-21 | 2005-12-21 | $7700.00 | Window Closed / Lapsed |