EP1814456A1 - Oxymetre de pouls - Google Patents

Oxymetre de pouls

Info

Publication number
EP1814456A1
EP1814456A1 EP05808333A EP05808333A EP1814456A1 EP 1814456 A1 EP1814456 A1 EP 1814456A1 EP 05808333 A EP05808333 A EP 05808333A EP 05808333 A EP05808333 A EP 05808333A EP 1814456 A1 EP1814456 A1 EP 1814456A1
Authority
EP
European Patent Office
Prior art keywords
measuring device
filter
sensor
narrow
mhz
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP05808333A
Other languages
German (de)
English (en)
Inventor
Torsten LÖNNEKER-LAMMERS
Torsten Hertz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LMT Lammers Medical Tech GmbH
Original Assignee
LMT Lammers Medical Tech GmbH
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 LMT Lammers Medical Tech GmbH filed Critical LMT Lammers Medical Tech GmbH
Publication of EP1814456A1 publication Critical patent/EP1814456A1/fr
Withdrawn legal-status Critical Current

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
    • A61B5/1455—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
    • A61B5/14551—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 for measuring blood gases
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
    • A61B2562/18—Shielding or protection of sensors from environmental influences, e.g. protection from mechanical damage
    • A61B2562/182—Electrical shielding, e.g. using a Faraday cage
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
    • A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves  involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging

Definitions

  • the invention relates to a pulse oximetric measuring device with a pulse oximeter sensor and a pulse oximeter module for evaluating and displaying the signals of the sensor.
  • the measurement principle in pulse oximetry is based on the wavelength-dependent optical perfusion of the blood vessels located under the skin.
  • the performance and Corn differences in the pulse oximeters available on the market are due to various algorithms in signal processing and are based on a great experience and knowledge base in the field of pulse oximetry. Therefore, some manufacturers, in addition to their own devices, also offer so-called OEM modules, which to a certain extent represent the core piece of measured value acquisition and processing and are thus outstandingly suitable for installation in other medical devices.
  • OEM modules which to a certain extent represent the core piece of measured value acquisition and processing and are thus outstandingly suitable for installation in other medical devices.
  • such devices can not be used in the vicinity of magnetic resonance tomographs without using the abovementioned long connecting lines, so that the sensitive pulse oximetry module is sufficiently far from the static magnetic fields and electromagnetic high-frequency measuring fields of the magnetic resonance tomography is removed. Because of the strong fields, it was therefore hitherto not possible to arrange the pulse oximetry module close to the patient and the MRI scanner, which
  • the object of the invention is to provide a pulsoximetric measuring device that can be integrated into an existing MR-compatible medical device, for example in a patient monitor or an incubator.
  • the solution according to the invention is that the pulse oximeter module is provided with a shield, that the shielding is grounded at only one point, and that each signal path is provided with a blocking filter with a narrowband passband.
  • the invention is a combination of three measures to integrate an OEM module offered in the market into a medical device. From a metrological point of view, an important role is played by the fact that MRI or the pulse ximetry did not result in any significant interference with regard to imaging or measurement accuracy. Even more important, however, is the exclusion of any endangerment of the patient and the user with regard to heating of the sensor or cable because of the unavoidable coupling of high-frequency energy and the generation of eddy currents caused by temporally and spatially variable magnetic fields.
  • Each enclosing shield ends at a grounding point;
  • the presence of ground loops impairs image formation and measurement accuracy and is therefore avoided according to the invention.
  • the third and most important measure is the filtering of the signals between the sensor and the OEM module.
  • the filter has an LC element (passive 2nd order filter).
  • the pass frequency of the narrowband filter is in the range of 0.1 to 15 MHz.
  • the pass-through frequency and the signal frequencies of the pulse oximeter do not overlap, since the magnetic field strength of 1.5 T is the Larmor frequency of the protons 63.9 MHz.
  • the pass frequency of the narrow-band filter is in the range of 0.1 to 8 MHz.
  • the pass frequency of the narrow-band filter can be substantially less than 10 MHz.
  • its evaluation unit can be integrated into the control electronics of an incubator and supplied by this with electricity.
  • Figure 1 is a schematic of a signal path from source to sink.
  • FIG. 2 shows the signal path of FIG. 1 with a filter according to the invention
  • FIG. 4 schematically shows the structure of a pulse oximetric measuring device according to the invention.
  • each signal is passed between source (Q) and drain (S) along a path (i.d.r., an electrical cable).
  • the source is on the left, the sink on the right.
  • a path i.d.r., an electrical cable.
  • Such a notch filter can be easily and yet effectively realized as an LC element (2nd order passive filter) as shown in FIG.
  • the useful frequency range (“10 MHz) is far enough away from that of MRT (42 ... 130 MHz) that filtering does not cause any negative side effects.
  • the resonance frequency was tuned for an MRT system with 1.5 T magnetic field strength, this corresponds to a Lamor frequency of 63.9 MHz. In this area, the insertion loss is better than 40 dB
  • a sensor 1 is connected via a shielded cable 2 and filter 3 to the OEM module 4, which in turn is connected to an evaluation electronics 5.
  • Filter 3, OEM module 4 and evaluation electronics 5 are arranged within a shielding housing 6, which is grounded at a position at 7.

Landscapes

  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biomedical Technology (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Optics & Photonics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

L'invention concerne un oxymètre de pouls comprenant un capteur (1) et un module (4) pour analyser et afficher les signaux du capteur (1). L'invention est caractérisée en ce que le module (4) est pourvu d'un blindage (6) mis à la terre en un seul point (7) et que chaque cheminement de signaux est doté d'un filtre d'arrêt (3) à bande passante étroite.
EP05808333A 2004-11-23 2005-11-23 Oxymetre de pouls Withdrawn EP1814456A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004056587A DE102004056587A1 (de) 2004-11-23 2004-11-23 Pulsoximetrisches Messgerät
PCT/EP2005/012550 WO2006056430A1 (fr) 2004-11-23 2005-11-23 Oxymetre de pouls

Publications (1)

Publication Number Publication Date
EP1814456A1 true EP1814456A1 (fr) 2007-08-08

Family

ID=35708427

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05808333A Withdrawn EP1814456A1 (fr) 2004-11-23 2005-11-23 Oxymetre de pouls

Country Status (4)

Country Link
US (1) US20080033264A1 (fr)
EP (1) EP1814456A1 (fr)
DE (1) DE102004056587A1 (fr)
WO (1) WO2006056430A1 (fr)

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Publication number Priority date Publication date Assignee Title
US20040116799A1 (en) * 2002-11-29 2004-06-17 Ravi Srinivasan Compatibility of accessory to magnetic resonance
US7657294B2 (en) 2005-08-08 2010-02-02 Nellcor Puritan Bennett Llc Compliant diaphragm medical sensor and technique for using the same
US20090143658A1 (en) * 2006-02-27 2009-06-04 Edwards Lifesciences Corporation Analyte sensor
US20080249385A1 (en) * 2007-04-04 2008-10-09 Luong Ngoc Phan Isolated intravenous analyte monitoring system
US8000918B2 (en) 2007-10-23 2011-08-16 Edwards Lifesciences Corporation Monitoring and compensating for temperature-related error in an electrochemical sensor
CA2703840A1 (fr) * 2007-11-02 2009-05-07 Edwards Lifesciences Corporation Systeme de surveillance d'analytes avec une source d'energie de secours destinee a etre utilisee pendant le transport du systeme ou en cas de coupure de l'alimentation primaire
US20090188811A1 (en) 2007-11-28 2009-07-30 Edwards Lifesciences Corporation Preparation and maintenance of sensors
WO2009137519A1 (fr) * 2008-05-05 2009-11-12 Edwards Lifesciences Corporation Membrane destinée à être utilisée avec des capteurs ampérométriques
US8900431B2 (en) * 2008-08-27 2014-12-02 Edwards Lifesciences Corporation Analyte sensor
CA2741853A1 (fr) * 2008-10-31 2010-05-06 Edwards Lifesciences Corporation Detecteur d'analyte comportant une couche electrode non active
US20110054284A1 (en) * 2009-08-28 2011-03-03 Edwards Lifesciences Corporation Anti-Coagulant Calibrant Infusion Fluid Source

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
US4651099A (en) * 1984-12-17 1987-03-17 Nmr Associates, Ltd. 1983-I Scan room for magnetic resonance imager
US4773422A (en) * 1987-04-30 1988-09-27 Nonin Medical, Inc. Single channel pulse oximeter
US5159929A (en) * 1990-06-14 1992-11-03 Morris G Ronald Insulated rf shield
US5323776A (en) * 1992-10-15 1994-06-28 Picker International, Inc. MRI compatible pulse oximetry system
US5433196A (en) * 1993-06-02 1995-07-18 The Board Of Trustees Of The University Of Illinois Oxygen-17 NMR spectroscopy and imaging in the human
US5758644A (en) * 1995-06-07 1998-06-02 Masimo Corporation Manual and automatic probe calibration
US5861865A (en) * 1995-08-14 1999-01-19 General Electric Company Audio/visual entertainment system for use with a magnetic resonance imaging device with adjustable video signal
US6697656B1 (en) * 2000-06-27 2004-02-24 Masimo Corporation Pulse oximetry sensor compatible with multiple pulse oximetry systems
DE50100797D1 (de) * 2001-04-12 2003-11-20 Loenneker Lammers Torsten Inkubator für die Kernspintomographie
ATE425728T1 (de) * 2001-10-05 2009-04-15 Draeger Medical Systems Inc Patientenliegevorrichtung mit leitungsmanagementsystem
US7519413B1 (en) * 2003-02-20 2009-04-14 S.A. Instruments, Inc. Apparatus and method for measuring motion in a strong magnetic field

Non-Patent Citations (1)

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Title
See references of WO2006056430A1 *

Also Published As

Publication number Publication date
US20080033264A1 (en) 2008-02-07
DE102004056587A1 (de) 2006-05-24
WO2006056430A1 (fr) 2006-06-01

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