EP0708615A1 - Glucometre non invasif - Google Patents

Glucometre non invasif

Info

Publication number
EP0708615A1
EP0708615A1 EP94920190A EP94920190A EP0708615A1 EP 0708615 A1 EP0708615 A1 EP 0708615A1 EP 94920190 A EP94920190 A EP 94920190A EP 94920190 A EP94920190 A EP 94920190A EP 0708615 A1 EP0708615 A1 EP 0708615A1
Authority
EP
European Patent Office
Prior art keywords
glucose
patient
skin
collection medium
reservoir
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Withdrawn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
EP94920190A
Other languages
German (de)
English (en)
Other versions
EP0708615A4 (fr
Inventor
Nooshin T. Azimi
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.)
Cygnus Inc
Original Assignee
Cygnus Therapeutic Systems
Cygnus Inc
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 Cygnus Therapeutic Systems, Cygnus Inc filed Critical Cygnus Therapeutic Systems
Publication of EP0708615A1 publication Critical patent/EP0708615A1/fr
Publication of EP0708615A4 publication Critical patent/EP0708615A4/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Withdrawn legal-status Critical Current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
    • A61B5/14532—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 glucose, e.g. by tissue impedance measurement

Definitions

  • This invention relates generally to methods and apparatus for glucose collection and concentration measurement.
  • the invention is directed to a method and apparatus for monitoring blood glucose levels noninvasively through a patient's skin.
  • U.S. Patent No. 5,036,861 describes a glucose monitor that collects the patient's sweat through a skin patch attached to the patient's wrist. Iontophoresis is used to transdermally introduce a gel into the patient's skin. The gel contains a cholinergic agent for stimulating the secretion mechanism of the eccrine sweat gland and agents that minimize or prevent loss of glucose from the sweat as it travels from the sweat gland to the skin patch. As in the '532 patent, the device described in the '861 patent measures the glucose level in the collected sweat using electrodes.
  • U.S. Patent No. 5,139,023 describes yet another "noninvasive" apparatus and method for monitoring blood glucose.
  • the monitor includes a glucose receiving medium such as water enclosed in a housing that holds the receiving medium against the patient's epithelial membrane.
  • the glucose receiving medium includes a permeation enhancing chemical such as a natural bile salt that enhances glucose permeability from interstitial fluid across the epithelial membrane into the monitor.
  • published European Patent Application EP 0 304 304 discloses a transdermal glucose detection system in which the detector contains a porous carrier saturated with detector chemicals.
  • the detector adhesively attaches to the patient's skin.
  • a membrane serves as a barrier to prevent migration of the detector chemicals out of the detector while permitting glucose to migrate into the detector. Interaction between glucose and the detector chemicals causes a perceivable color change over a six to twelve hour period.
  • the device only detects the presence of glucose; it does not measure the actual amount of glucose in the detector.
  • This invention provides a truly noninvasive glucose monitoring apparatus and method that does not rely upon heat, electricity or chemicals to collect glucose from interstitial fluid across the patient's skin. Moreover, the method and apparatus of this invention monitor blood glucose in real time, that is to say, in a time period short enough to enable a diabetic to take appropriate action to correct blood glucose levels.
  • a collection device comprising a reservoir containing a glucose collection medium such as water is placed against the stratum corneum of the patient's skin for a predetermined period of time. At least a portion of the glucose collection medium is removed from the reservoir at the end of the predetermined time and analyzed for glucose concentration.
  • a glucose collection medium such as water
  • Figure 1 is a side cross-sectional view of a glucose collection device according to the preferred embodiment of this invention.
  • Figure 2 is a bottom elevational view of the preferred glucose collection device.
  • Figure 3 is a cross-sectional view of a sensor for use with a glucose analysis method for use with this invention.
  • FIG. 4 is a schematic representation of a glucose monitoring system according to this invention.
  • This invention presents a simple and noninvasive method for monitoring blood glucose levels. It is well-known that glucose can be found in a patient's interstitial fluid and in a patient's sweat. Heretofore, however, it had been thought that glucose could not cross the patient's skin in a detectable amount in real time without the use of a permeability enhancer. See, e.g., U.S. Patent No. 5,139,023 at col. 7, line 3. It had also been thought that even when sweat or interstitial fluid is actively extracted from the patient, active pharmacological agents are needed to preserve the presence of glucose in the extracted sample. See, e.g., U.S. Patent No. 5,036,861, col. 3, lines 1-10.
  • This invention is a method and apparatus for detecting blood glucose in a truly noninvasive manner without actively extracting interstitial fluid from the patient and without the use of sweat inducers, glucose preservers or permeability enhancers.
  • glucose is collected through the stratum corneum of the patient's skin by a reservoir containing a glucose collection medium. After the passage of a predetermined time period, the glucose collection medium is analyzed to measure the quantity of glucose present.
  • a preferred collection device for practicing this invention is shown in Figures 1 and 2.
  • the device 10 comprises a reservoir 12 bordered by a cover 14, adhesive layer 16, and the stratum corneum of the patient's skin 18.
  • the device is formed by attaching the plastic cover 14 to a double-sided adhesive 16 in which an oval or other-shaped hole has been formed.
  • cover 14 is formed from cellophane plastic and adhesive layer 16 is Avery double-sided adhesive, part no. MED 3044.
  • the preferred glucose collection medium is distilled deionized water.
  • the distilled deionized water is injected into reservoir 12 through a hypodermic needle and syringe 20.
  • glucose will migrate from the patient's interstitial fluid through the skin 18 and into the water within reservoir 12. After the water has rested against the patient's skin for a predetermined period of time, the water is withdrawn for analysis.
  • This glucose collection device and method can collect glucose from the patient without the use of chemicals or mechanical extraction.
  • hydrogel may be used as a collection medium. Suitable hydrogels are described in U.S. Patent No. 5,139,023.
  • Water (or other collection medium) from the reservoir may be extracted at periodic intervals (preferably in the range of 5 to 10 minutes) and analyzed to determine its glucose content.
  • a preferred glucose analysis method is described by LaCourse et al. in "Optimization of Waveforms for Pulsed Amperometric Detection of Carbohydrates Based on Pulsed Voltammetry, " 65 Analytical Chemistry 50-55 (1 January 1993) , although other analysis methods may be used.
  • the preferred pulse amperometric voltammetry (PAD) analysis method combines high performance liquid chromatography with electrochemical detection using bi-directional voltage waveforms. Specifically, water extracted from the reservoir is diffused onto a chromatography column. The column is washed with a high pressure solvent such as a NaOH solution.
  • a stepped voltage waveform is applied across two electrodes in the solution, one of which is a gold rotating disk electrode.
  • the voltage waveform has three parts: a detection potential in the range of -200 to +400 mV for greater than 40 ms detection period, an oxidation potential in the range of 300 to 800 mV for greater than approximately 60 ms, and a reduction potential in the range of -800 to +100 mV for greater than approximately 60 ms.
  • a plot of electrode current at the gold electrode versus applied voltage yields a curve with signature peaks at specific voltage values for certain solutes such as glucose. The peak amplitude or peak area are measures of the concentration of that solute.
  • An alternative glucose concentration analysis method is shown schematically in Figures 3 and 4.
  • the glucose measurement technique of this embodiment is similar to the enzymatic technique described in U.S. Patent No. 5,165,407 and does not require the glucose collection medium to be extracted from the collection device.
  • a glucose sensor 30 is shown in detail in Figure 3.
  • a sensor body 32 is received within a stainless steel hollow tubular needle 34.
  • the sensor body includes a Teflon-coated platinum-iridium wire 36
  • a glucose oxidase layer 40 is immobilized within the cavity 38, and comprises a cellulose acetate polymer layer attached to the surface of the Pt-Ir wire, with glucose oxidase crosslinked through glutaraldehyde onto the cellulose acetate to form an indicating electrode.
  • the procedure is described in more detail in U.S. Patent No. 5,165,407.
  • the entirety of the indicating electrode is covered by a membrane 42 of polyurethane, also as described in U.S. Patent No.
  • FIG. 4 is a schematic representation of a glucose collection and measurement system using this alternative glucose analysis method.
  • the sensor 30 described above with reference to Figure 3 is inserted into a glucose collection device attached to the patient's skin 18 as described with reference to Figures 1 and 2 above so that the sensor's aperture 44 is exposed to the glucose collection medium 12.
  • a conductor 60 leads from the indicating electrode of sensor 30 to a glucose measurement instrument 62.
  • a second conductor 64 leads from a reference electrode 66 attached to the patient's skin 18. Instrument 62 applies a voltage across conductors 60 and 64; the current measured across the electrodes is related to the concentration of glucose in the collection medium in a manner known in the art.
  • Glucose was collected from an adult human using an apparatus substantially similar to the apparatus shown in Figures 1 and 2.
  • the device was attached to the stratum corneum of the skin on the patient's forearm, and the device's reservoir was initially filled with a sample consisting of 0.5 ml. of distilled deionized water via a hypodermic needle and syringe.
  • the sample was withdrawn from the reservoir after five minutes and was replaced with a fresh sample of distilled deionized water at five minute intervals for a total of 30 minutes.
  • the final sample remained in the reservoir for 30 minutes before being withdrawn and analyzed.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Emergency Medicine (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)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Investigating Or Analysing Biological Materials (AREA)

Abstract

Instrument non invasif de contrôle du glucose sanguin et procédé d'utilisation associé ne faisant appel ni à la chaleur, ni à l'électricité, ni à des produits chimiques pour recueillir le glucose de liquides interstitiels à travers la peau du patient. De plus, ledit procédé et ledit glucomètre assurent des contrôles en temps réel, c'est-à-dire dans un laps de temps suffisamment court pour permettre à un patient diabétique de prendre les mesures propres à corriger son taux de glucose sanguin. Le dispositif de recueil (10) comporte un réservoir (12) rempli d'un milieu de recueil du glucose tel que de l'eau qui s'applique pendant un temps prédéterminé sur la couche cornéenne de la peau du patient après quoi, on prélève au moins une partie du milieu de recueil afin d'analyser sa concentration en glucose.
EP94920190A 1993-07-16 1994-06-14 Glucometre non invasif Withdrawn EP0708615A4 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US9297593A 1993-07-16 1993-07-16
US92975 1993-07-16
PCT/US1994/006684 WO1995002357A1 (fr) 1993-07-16 1994-06-14 Glucometre non invasif

Publications (2)

Publication Number Publication Date
EP0708615A1 true EP0708615A1 (fr) 1996-05-01
EP0708615A4 EP0708615A4 (fr) 1996-10-16

Family

ID=22236062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94920190A Withdrawn EP0708615A4 (fr) 1993-07-16 1994-06-14 Glucometre non invasif

Country Status (5)

Country Link
EP (1) EP0708615A4 (fr)
JP (1) JPH09503924A (fr)
AU (1) AU7107394A (fr)
CA (1) CA2167393A1 (fr)
WO (1) WO1995002357A1 (fr)

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US5890489A (en) * 1996-04-23 1999-04-06 Dermal Therapy (Barbados) Inc. Method for non-invasive determination of glucose in body fluids
US5954685A (en) * 1996-05-24 1999-09-21 Cygnus, Inc. Electrochemical sensor with dual purpose electrode
US6139718A (en) 1997-03-25 2000-10-31 Cygnus, Inc. Electrode with improved signal to noise ratio
US8287483B2 (en) 1998-01-08 2012-10-16 Echo Therapeutics, Inc. Method and apparatus for enhancement of transdermal transport
US6587705B1 (en) 1998-03-13 2003-07-01 Lynn Kim Biosensor, iontophoretic sampling system, and methods of use thereof
PT1077634E (pt) 1998-05-13 2003-12-31 Cygnus Therapeutic Systems Monitorizacao de substancias fisiologicas a analisar
CA2329411C (fr) 1998-05-13 2004-01-27 Cygnus, Inc. Ensembles de collecte pour systemes d'echantillonnage transdermiques
JP2002514452A (ja) 1998-05-13 2002-05-21 シグナス， インコーポレイテッド 生理学的検体の測定のための信号処理
ATE246356T1 (de) 1998-05-13 2003-08-15 Cygnus Therapeutic Systems Vorrichtung zum vorhersagen von physiologischen messwerten
US6180416B1 (en) 1998-09-30 2001-01-30 Cygnus, Inc. Method and device for predicting physiological values
DK1102559T3 (da) 1998-09-30 2003-09-29 Cygnus Therapeutic Systems Fremgangsmåde og anordning til forudsigelse af fysiologiske værdier
CA2350068A1 (fr) 1998-10-28 2000-05-04 Cygnus, Inc. Necessaire et procede permettant de controler la qualite d'un systeme de prelevement par ionophorese
US20040171980A1 (en) 1998-12-18 2004-09-02 Sontra Medical, Inc. Method and apparatus for enhancement of transdermal transport
US6561978B1 (en) 1999-02-12 2003-05-13 Cygnus, Inc. Devices and methods for frequent measurement of an analyte present in a biological system
JP2002542498A (ja) 1999-04-22 2002-12-10 シグナス， インコーポレイテッド 干渉種を除去するための方法およびデバイス
US6251083B1 (en) 1999-09-07 2001-06-26 Amira Medical Interstitial fluid methods and devices for determination of an analyte in the body
WO2003000127A2 (fr) 2001-06-22 2003-01-03 Cygnus, Inc. Procedes d'amelioration de l'efficacite d'un systeme de controle d'analyte
US8260393B2 (en) 2003-07-25 2012-09-04 Dexcom, Inc. Systems and methods for replacing signal data artifacts in a glucose sensor data stream
US9247901B2 (en) 2003-08-22 2016-02-02 Dexcom, Inc. Systems and methods for replacing signal artifacts in a glucose sensor data stream
US8010174B2 (en) 2003-08-22 2011-08-30 Dexcom, Inc. Systems and methods for replacing signal artifacts in a glucose sensor data stream
US7150975B2 (en) 2002-08-19 2006-12-19 Animas Technologies, Llc Hydrogel composition for measuring glucose flux
US20140121989A1 (en) 2003-08-22 2014-05-01 Dexcom, Inc. Systems and methods for processing analyte sensor data
US7920906B2 (en) 2005-03-10 2011-04-05 Dexcom, Inc. System and methods for processing analyte sensor data for sensor calibration
CN100479750C (zh) 2003-09-02 2009-04-22 早出广司 葡萄糖传感器和葡萄糖浓度测定装置
US9247900B2 (en) 2004-07-13 2016-02-02 Dexcom, Inc. Analyte sensor
US11633133B2 (en) 2003-12-05 2023-04-25 Dexcom, Inc. Dual electrode system for a continuous analyte sensor
US8423114B2 (en) 2006-10-04 2013-04-16 Dexcom, Inc. Dual electrode system for a continuous analyte sensor
WO2005057168A2 (fr) 2003-12-05 2005-06-23 Dexcom, Inc. Techniques d'etalonnage pour un capteur de substances a analyser en continu
US8792955B2 (en) 2004-05-03 2014-07-29 Dexcom, Inc. Transcutaneous analyte sensor
DK3524142T3 (da) * 2004-07-13 2021-07-19 Dexcom Inc Transkutan analytsensor
US8886272B2 (en) 2004-07-13 2014-11-11 Dexcom, Inc. Analyte sensor
US20060020192A1 (en) 2004-07-13 2006-01-26 Dexcom, Inc. Transcutaneous analyte sensor
WO2006127694A2 (fr) 2004-07-13 2006-11-30 Dexcom, Inc. Detecteur d'analyte
US8224414B2 (en) 2004-10-28 2012-07-17 Echo Therapeutics, Inc. System and method for analyte sampling and analysis with hydrogel
CN101707872B (zh) 2007-04-27 2014-10-22 回声治疗有限公司 用于分析物感测或经皮给药的皮肤渗透装置
EP2322093B1 (fr) 2008-07-31 2018-01-10 Sysmex Corporation Procédé de dosage d'un composant in vivo et appareil et élément de collecte pour le dosage d'un composant in vivo
EP3315958B1 (fr) 2008-11-04 2021-09-15 PHC Holdings Corporation Dispositif de mesure
JP2010271259A (ja) 2009-05-25 2010-12-02 Sysmex Corp 生体成分分析方法、生体成分分析装置、生体成分分析用カートリッジおよび生体成分分析用キット
KR101666978B1 (ko) * 2014-09-17 2016-10-24 주식회사 아이센스 생체시료 내 분석대상물질의 농도측정방법 및 측정장치

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US4595011A (en) * 1984-07-18 1986-06-17 Michael Phillips Transdermal dosimeter and method of use
US5050604A (en) * 1989-10-16 1991-09-24 Israel Reshef Apparatus and method for monitoring the health condition of a subject
US5140985A (en) * 1989-12-11 1992-08-25 Schroeder Jon M Noninvasive blood glucose measuring device
US5036861A (en) * 1990-01-11 1991-08-06 Sembrowich Walter L Method and apparatus for non-invasively monitoring plasma glucose levels

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Title
See also references of WO9502357A1 *

Also Published As

Publication number Publication date
EP0708615A4 (fr) 1996-10-16
AU7107394A (en) 1995-02-13
JPH09503924A (ja) 1997-04-22
CA2167393A1 (fr) 1995-01-26
WO1995002357A1 (fr) 1995-01-26

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