EP0484547A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Catheter for measurement and method of measuring oxygen saturation degree or flow speed of blood
Assignee: IWASAKI, HITOSHI
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Filing: 1991-05-17
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Granted: —
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Expires: 2011-05-17
Abstract
Abstract A catheter for measurement comprising light emitting and light receiving optical fibers inserted into the catheter in which respective tip surfaces of both optical fibers are disposed face-to-face and apart from each other at a required distance on the outer wall of the catheter and fixed thereto. Rays of light for measurement and reference are emitted from the light emitting fiber of the catheter and, by measuring the degree of penetration of said two kinds of light emitting from the light receiving optical fiber after passing through blood present between the tip surfaces of both optical fibers, an oxygen saturation degree or flowing speed of blood can be found in real time.
Inventors
- 👤 Hitoshi Iwasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 04:05
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/026; A61B5/0261; A61B5/145; A61B5/1455; A61B5/1459; A61B2562/00; A61B2562/02; A61B2562/0233; A61B2562/0238
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
45 words
A measuring catheter having light-emitting and light-receiving optical fibers disposed within said catheter, the end faces of said light-emitting and light-receiving optical fibers being fixed to the outer sidewall of said catheter so that they are opposite to each other with a predetermined space therebetween.
Claim 2
Dependent Claim
31 words
A measuring catheter as claimed in claim 1 wherein the space between the end faces of said light-emitting and light-receiving optical fibers is in the range of 0.75 to 1.5 mm.
Claim 3
Dependent Claim
38 words
A measuring catheter as claimed in claim 1 wherein a marker substance transfer tube is disposed within said catheter and a plurality of marker substance outlets communicating with said tube are formed in the sidewall of said catheter.
Claim 4
Independent Claim
137 words
A method for measuring the degree of oxygen saturation of blood which comprises providing a measuring catheter having light-emitting and light-receiving optical fibers disposed within said catheter, the end faces of said light-emitting and light-receiving optical fibers being fixed to the outer sidewall of said catheter so that they are opposite to each other with a predetermined space therebetween, supplying light having a wavelength of about 805 nm and visible light to said light-emitting optical fiber, either simultaneously or alternately, measuring the transmittances of said two types of light that are collected by said light-receiving optical fiber after having passed through the blood present in the gap between the end faces of both optical fibers, and determining the degree of oxygen saturation of the blood on the basis of the transmittances of said two types of light.
Claim 5
Independent Claim
141 words
A method for measuring blood flow rate which comprises providing a measuring catheter having light-emitting and light-receiving optical fibers disposed within said catheter, the end faces of said light-emitting and light-receiving optical fibers being fixed to the outer sidewall of said catheter so that they are opposite to each other with a predetermined space therebetween, supplying light having a wavelength of about 805 nm and visible light or light having a wavelength of 900 nm or longer to said light-emitting optical fiber, either simultaneously or alternately, measuring the transmittances of said two types of light that are collected by said light-receiving optical fiber after having passed through the marker substance-containing blood present in the gap between the end faces of both optical fibers, and determining the blood flow rate on the basis of the transmittances of said two types of light.
Claim 6
Dependent Claim
63 words
A method as claimed in claim 5 wherein said intravascularly retained optical-fiber measuring catheter of transmission type is provided with a marker substance transfer tube disposed within said catheter and a plurality of marker substance outlets communicating with said tube are formed in the sidewall of said catheter, and wherein measurements are made while a marker substance is being discharged from said outlets.
References Cited (Backward Citations)
No citation records indexed.
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