WO2002098478A2 - Referencing optical catheters - Google Patents
Referencing optical catheters Download PDFInfo
- Publication number
- WO2002098478A2 WO2002098478A2 PCT/US2002/014790 US0214790W WO02098478A2 WO 2002098478 A2 WO2002098478 A2 WO 2002098478A2 US 0214790 W US0214790 W US 0214790W WO 02098478 A2 WO02098478 A2 WO 02098478A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- catheter
- electromagnetic radiation
- reflected
- reference signal
- blood
- Prior art date
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
- A61B5/0082—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes
- A61B5/0084—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes for introduction into the body, e.g. by catheters
-
- 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
- A61B5/14535—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 haematocrit
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/47—Scattering, i.e. diffuse reflection
- G01N21/4785—Standardising light scatter apparatus; Standards therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2560/00—Constructional details of operational features of apparatus; Accessories for medical measuring apparatus
- A61B2560/02—Operational features
- A61B2560/0223—Operational features of calibration, e.g. protocols for calibrating sensors
- A61B2560/0228—Operational features of calibration, e.g. protocols for calibrating sensors using calibration standards
- A61B2560/0233—Optical standards
Definitions
- catheter technologies require complex, microscopic manufacturing processes that make it hard to provide exactly reproducible readings from catheter to 25 catheter.
- the invention provides methods and apparatus to reference or normalize optical measurements, by removing or accounting for background factors and artifacts, such as motion artifacts.
- the invention provides methods for referencing factors due to equipment that can be addressed prior to use of an optical catheter, as well as factors due to the local measurement conditions in a patient that arise during use. Some of these factors are the same from patient to patient, such as the general nature of blood, and others vary from patient to patient, such as the specific constituents of each patient's blood.
- the known environment can be a new reflecting apparatus as described herein including a hollow well and a reflective internal surface.
- the known environment can also be a liquid having known optical characteristics, such as scatter and absorbance.
- the liquid can include styrene divinyl/benzene cross- linked copolymer beads suspended in an ultrapure aqueous solution.
- the new apparatus can be used individually or in conjunction with each other.
- the invention features methods of obtaining reference measurements of the various components of the materials through which electromagnetic radiation travels from a catheter to the tissue, into the tissue, and back to the catheter to enhance the ability to discriminate measurements from the target.
- all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described below. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety. In case of conflict, the present specification, including definitions, will control.
- the materials, methods, and examples are illustrative only and not intended to be limiting.
- the guide catheter 50 includes a distal end 54 and a proximal end 56.
- the window 52 is positioned between the proximal and distal ends so that the window 52 is within the aorta or vena cava when the guide catheter is fully in place.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02734338A EP1401328A4 (en) | 2001-05-31 | 2002-05-10 | Referencing optical catheters |
AU2002305512A AU2002305512A1 (en) | 2001-05-31 | 2002-05-10 | Referencing optical catheters |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/871,759 US6615062B2 (en) | 2001-05-31 | 2001-05-31 | Referencing optical catheters |
US09/871,759 | 2001-05-31 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002098478A2 true WO2002098478A2 (en) | 2002-12-12 |
WO2002098478A3 WO2002098478A3 (en) | 2003-02-27 |
Family
ID=25358063
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2002/014790 WO2002098478A2 (en) | 2001-05-31 | 2002-05-10 | Referencing optical catheters |
Country Status (4)
Country | Link |
---|---|
US (1) | US6615062B2 (en) |
EP (1) | EP1401328A4 (en) |
AU (1) | AU2002305512A1 (en) |
WO (1) | WO2002098478A2 (en) |
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2002
- 2002-05-10 WO PCT/US2002/014790 patent/WO2002098478A2/en not_active Application Discontinuation
- 2002-05-10 AU AU2002305512A patent/AU2002305512A1/en not_active Abandoned
- 2002-05-10 EP EP02734338A patent/EP1401328A4/en not_active Withdrawn
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Also Published As
Publication number | Publication date |
---|---|
WO2002098478A3 (en) | 2003-02-27 |
EP1401328A2 (en) | 2004-03-31 |
US20030097048A1 (en) | 2003-05-22 |
US6615062B2 (en) | 2003-09-02 |
EP1401328A4 (en) | 2006-04-05 |
AU2002305512A1 (en) | 2002-12-16 |
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