US5218962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple region pulse oximetry probe and oximeter
Assignee: Nellcor Puritan Bennett LLC
•
Filing: 1991-04-15
•
Granted: 1993-06-15
•
Expires: 2011-04-15
Abstract
Abstract A first light emitting element directs light through a first region of tissue, a second light emitting element directs light through a second region of tissue that is spatially distinct from the first region of tissue, and a photodetector detects light traveling through the first and second regions. First and second oxygen saturation values are calculated from the amount of light detected from the first and second regions of tissue, respectively. A difference calculating unit calculates a difference value which represents how much the first oxygen saturation value differs from the second oxygen saturation value, and a comparator compares the difference value to a threshold value. A threshold indicating signal is provided when the difference value has a selected mathematical relationship (e.g., less than or equal) to the threshold value.
Inventors
- 👤 Paul D. Mannheimer
- 👤 D. Christopher Chung
- 👤 Carl Ritson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:39
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/1464; A61B5/14542; A61B5/68; A61B5/6846; A61B5/6847; A61B5/6852; A61B5/6853; A61B5/6885
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
170 words
A pulse oximeter comprising: light emitting means for directing light through first and second unique regions of tissue; detecting means for detecting the light directed through the first and second regions of tissue; wherein the light emitting means and the detecting means are disposed in close proximity to each other; saturation calculating means, coupled to the detecting means, for calculating a first oxygen saturation value from the amount of light detected from the first region of tissue and a second oxygen saturation value from the amount of light detected from the second region of tissue; difference calculating means, coupled to the saturation calculating means for calculating a difference value which represents how much the first oxygen saturation value differs from the second oxygen saturation value; threshold comprising means, coupled to the difference calculating means, for comparing the difference value to a threshold value; and threshold indicating means, coupled to the threshold comparing means, for providing a threshold indicating signal when the difference value is not greater than the threshold value.
Claim 2
Dependent Claim
170 words
A pulse oximeter comprising: light emitting means for directing light through first and second unique regions of tissue; detecting means for detecting the light directed through the first and second regions of tissue; wherein the light emitting means and the detecting means are disposed in close proximity to each other; saturation calculating means, coupled to the detecting means, for calculating a first oxygen saturation value from the amount of light detected from the first region of tissue and a second oxygen saturation value from the amount of light detected from the second region of tissue; difference calculating means, coupled to the saturation calculating means for calculating a difference value which represents how much the first oxygen saturation value differs from the second oxygen saturation value; threshold comprising means, coupled to the difference calculating means, for comparing the difference value to a threshold value; and threshold indicating means, coupled to the threshold comparing means, for providing a threshold indicating signal when the difference value is not greater than the threshold value.
Claim 3
Dependent Claim
40 words
The probe according to claim 1 wherein the light emitting means comprises: a first light emitting element for directing light through the first region of tissue; a second light emitting element for directing light through the second region of tissue.
Claim 4
Dependent Claim
68 words
The probe according to claim 2 wherein the detecting means comprises: a first photodetector disposed in close proximity to the first light emitting element and spaced apart therefrom for detecting the light directed through the first region of tissue; and a second photodetector disposed in close proximity to the second light emitting element and spaced apart therefrom for detecting the light directed through the second region of tissue.
Claim 5
Dependent Claim
30 words
The probe according to claim 3 wherein the first light emitting element, the second light emitting element, the first photodetector, and the second photodetector are disposed in a common housing.
Claim 6
Dependent Claim
39 words
The probe according to claim 3 wherein the first light emitting element and the first photodetector are disposed in a first housing, and wherein the second light emitting element and the second photodetector are disposed in a second housing.
Claim 7
Dependent Claim
44 words
The probe according to claim 4 further comprising placement means, coupled to the housing, for placing the first light emitting element, the second light emitting element, the first photodetector, and the second photodetector in close proximity to the first and second regions of tissue.
Claim 8
Dependent Claim
22 words
The probe according to claim 6 wherein the placement means comprises an elongated handle having a first end attached to the housing.
Claim 9
Dependent Claim
26 words
The probe according to claim 7 wherein the handle is formed for allowing bending in a first direction and for resisting bending in a second direction.
Claim 10
Dependent Claim
19 words
The probe according to claim 8 wherein the handle comprises a substantially flat first rod coupled to the housing.
Claim 11
Dependent Claim
61 words
The pulse oximeter according to claim 1 further comprising displayed saturation calculating means, coupled to the detecting means and to the threshold indicating means, for calculating a displayed saturation value when the difference value is not greater than the threshold value and for inhibiting the display of the displayed saturation value when the difference value is greater than the threshold value.
Claim 12
Independent Claim
160 words
A method of determining a characteristic of blood comprising the steps of: directing electromagnetic radiation through a first region of tissue; detecting the electromagnetic radiation from the first region of tissue; calculating a first blood oxygen saturation value from the amount of electromagnetic radiation detected from the first region of tissue; directing electromagnetic radiation through a second region of tissue, the second region of tissue being unique from the first region of tissue and in close proximity to the first region of tissue; detecting the electromagnetic radiation from the second region of tissue; calculating a second blood oxygen saturation value from the amount of electromagnetic radiation detected from the second region of tissue; calculating a difference value which represents how much the first blood oxygen saturation value differs from the second blood oxygen saturation value; comparing the difference value to a threshold value; and providing a threshold indicating signal when the difference value is not greater than the threshold value.
Claim 13
Independent Claim
160 words
A method of determining a characteristic of blood comprising the steps of: directing electromagnetic radiation through a first region of tissue; detecting the electromagnetic radiation from the first region of tissue; calculating a first blood oxygen saturation value from the amount of electromagnetic radiation detected from the first region of tissue; directing electromagnetic radiation through a second region of tissue, the second region of tissue being unique from the first region of tissue and in close proximity to the first region of tissue; detecting the electromagnetic radiation from the second region of tissue; calculating a second blood oxygen saturation value from the amount of electromagnetic radiation detected from the second region of tissue; calculating a difference value which represents how much the first blood oxygen saturation value differs from the second blood oxygen saturation value; comparing the difference value to a threshold value; and providing a threshold indicating signal when the difference value is not greater than the threshold value.
Claim 14
Dependent Claim
46 words
The method according to claim 11 further comprising the steps of: calculating a displayed saturation value when the difference value is not greater than the threshold value; and inhibiting the display of the displayed saturation value when the difference value is greater than the threshold value.
References Cited (Backward Citations)
US4938218A
Cited
US4890619A
Cited
WO1989001310A1
Cited
US4927264A
Cited
GB2216804A
Cited
US5024226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-14 | 1996-12-14 | 1997-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-14 | 2000-12-14 | 2001-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-14 | 2004-12-14 | 2005-06-15 | $7700.00 | Window Closed / Lapsed |