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US4252123A
Expired / Lapsed
US
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Device for the transcutaneous electrochemical determination of the partial oxygen pressure in blood
Assignee: US Philips Corp
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Filing: 1979-02-09
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Granted: 1981-02-24
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Expires: 1999-02-09
Abstract
Abstract A device for the transcutaneous electrochemical determination of the partial oxygen pressure in blood, comprising a measuring head which includes at least three measuring cells of the Clark-type, comprising periodically actuated heating elements, the actuation of the heating elements being realized at a phase difference such that always at least one measuring cell provides a reliable measuring value.
Inventors
- 👤 Hans-Peter Kimmich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:01
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/14542; A61B5/1468; A61B5/1477; A61B5/1491
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
160 words
An electrochemical device for transcutaneous electrochemical measurement of the partial pressure of oxygen in the blood of humans or animals comprising: n measuring cells, n being equal to or greater than three, each measuring cell including electrodes, a surface for contacting the skin, and heating element means for heating the surface; a plurality of measuring circuits, a separate measuring circuit being operatively connected to the electrodes of each cell; and power supply means for periodic, sequential actuation of the heating element means, each of said heating element means being actuated for a first period of T 1 minutes which is followed by a second period of T 2 minutes during which the heating element means is not actuated, the heating element means being actuated in a sequence so that actuation of each heating element means commences at an instant (T 1 +T 2 )/n minutes after the beginning of the actuation of the preceeding heating element means in the sequence.
Claim 2
Dependent Claim
160 words
An electrochemical device for transcutaneous electrochemical measurement of the partial pressure of oxygen in the blood of humans or animals comprising: n measuring cells, n being equal to or greater than three, each measuring cell including electrodes, a surface for contacting the skin, and heating element means for heating the surface; a plurality of measuring circuits, a separate measuring circuit being operatively connected to the electrodes of each cell; and power supply means for periodic, sequential actuation of the heating element means, each of said heating element means being actuated for a first period of T 1 minutes which is followed by a second period of T 2 minutes during which the heating element means is not actuated, the heating element means being actuated in a sequence so that actuation of each heating element means commences at an instant (T 1 +T 2 )/n minutes after the beginning of the actuation of the preceeding heating element means in the sequence.
Claim 3
Dependent Claim
85 words
A device as claimed in claim 1 further comprising: a measuring head which contains the measuring cells; a body having low heat conductivity which is mounted within the head and which includes means for mounting the measuring cells; an additional annular measuring cell which surrounds the n measuring cells and which includes a non-heated surface; the surfaces of the n measuring cells and of the additional measuring cell being disposed in a plane which is substantially the same plane as a surface of the body.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |