WO2000002483A3 - Fetal pulse oximetry sensor - Google Patents

Fetal pulse oximetry sensor Download PDF

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Publication number
WO2000002483A3
WO2000002483A3 PCT/US1999/015420 US9915420W WO0002483A3 WO 2000002483 A3 WO2000002483 A3 WO 2000002483A3 US 9915420 W US9915420 W US 9915420W WO 0002483 A3 WO0002483 A3 WO 0002483A3
Authority
WO
WIPO (PCT)
Prior art keywords
scalp
sensors
sensor
fetal
blood fraction
Prior art date
Application number
PCT/US1999/015420
Other languages
French (fr)
Other versions
WO2000002483A2 (en
Inventor
David R Tobler
Mohamed K Diab
Robert J Kopotic
Original Assignee
Masimo Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Masimo Corp filed Critical Masimo Corp
Priority to EP99935456A priority Critical patent/EP1096876A2/en
Publication of WO2000002483A2 publication Critical patent/WO2000002483A2/en
Publication of WO2000002483A3 publication Critical patent/WO2000002483A3/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
    • A61B5/14542—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue for measuring blood gases
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/145—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
    • A61B5/1455—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters
    • A61B5/1464—Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue using optical sensors, e.g. spectral photometrical oximeters specially adapted for foetal tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
    • A61B5/683—Means for maintaining contact with the body
    • A61B5/6839—Anchoring means, e.g. barbs
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
    • A61B5/6879—Means for maintaining contact with the body
    • A61B5/6882—Anchoring means
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2503/00—Evaluating a particular growth phase or type of persons or animals
    • A61B2503/02—Foetus

Abstract

A sensor provides pulse oximetry measurements from the presenting portion of a fetus. In particular, a spiral probe is designed to attach the sensor to the fetal scalp. In one sensor configuration, a light emitting region of the probe embedded in the scalp in conjunction with a light detector located at the scalp surface measures absorption from a larger volume of the scalp tissue than conventional fetal sensors. In another sensor configuration, light emitting and light collecting regions of the probe embedded in the scalp are angled with respect to the scalp surface to measure absorption from a larger volume and deeper layers of the scalp tissue than conventional fetal sensors. These sensors increase the likelihood of measuring blood volume changes occurring in larger arterioles versus smaller arterioles or capillaries, yielding a representative measurement of central arterial oxygen saturation. These sensors also reduce the calibration errors caused by a low blood fraction. Localized arteriolar flow is stimulated with heat or vasodilating substances to reduce the effects of localized oxygen consumption and to increase blood fraction. A three-wavelength sensor is utilized to detect a low blood fraction condition.
PCT/US1999/015420 1998-07-13 1999-07-09 Fetal pulse oximetry sensor WO2000002483A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99935456A EP1096876A2 (en) 1998-07-13 1999-07-09 Fetal pulse oximetry sensor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US9264498P 1998-07-13 1998-07-13
US60/092,644 1998-07-13

Publications (2)

Publication Number Publication Date
WO2000002483A2 WO2000002483A2 (en) 2000-01-20
WO2000002483A3 true WO2000002483A3 (en) 2000-04-13

Family

ID=22234315

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/015420 WO2000002483A2 (en) 1998-07-13 1999-07-09 Fetal pulse oximetry sensor

Country Status (3)

Country Link
US (1) US6285896B1 (en)
EP (1) EP1096876A2 (en)
WO (1) WO2000002483A2 (en)

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