EP0330463A1
Expired / Lapsed
EP
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Blood flow resistance measuring apparatus
Assignee: Colin Electronics Co Ltd
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Filing: 1989-02-23
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Granted: —
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Expires: 2009-02-23
Abstract
Abstract An apparatus for detecting a peripheral resistance opposing blood flow through a peripheral portion (20) of the subject, including a first determining device (12, 36) for determining blood pressure of the subject, a second determining means (38, 40, 44, 36) for determining at least one of a flow rate and a flow amount of blood which flows through an arterial vessel (22) extending through the peripheral portion (20) of the subject; and a calculating device (36) for calculating the peripheral resistance of the subject, based on the blood pressure and the at least one of the blood flow rate and the blood flow amount.
Inventors
- 👤 William A. Ogletree
- 👤 Norio Kawamura
- 👤 Hifumi Yokoe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 20:29
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/02; A61B5/02007; A61B5/021; A61B5/022; A61B5/0225; A61B5/145; A61B5/1455; A61B5/14551; A61B8/00; A61B8/06; A61B5/14552
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
An apparatus for detecting a resistance opposing blood flow through a peripheral portion (20) of a subject's body, comprising: first determining means (12, 36) for determining blood pressure of said subject; second determining means (38, 40, 44, 36) for determining at least one of a flow rate and a flow amount of blood which flows through an arterial vessel (22) extending through said peripheral portion (20) of said body; and calculating means (36) for calculating said resistance based on said blood pressure and said at least one of the blood flow rate and the blood flow amount.
Claim 2
Independent Claim
97 words
An apparatus for detecting a resistance opposing blood flow through a peripheral portion (20) of a subject's body, comprising: first determining means (12, 36) for determining blood pressure of said subject; second determining means (38, 40, 44, 36) for determining at least one of a flow rate and a flow amount of blood which flows through an arterial vessel (22) extending through said peripheral portion (20) of said body; and calculating means (36) for calculating said resistance based on said blood pressure and said at least one of the blood flow rate and the blood flow amount.
Claim 3
Dependent Claim
74 words
The apparatus as set forth in claim 1, wherein said second determining means comprises an ultrasonic wave generator (38) for generating and transmitting ultrasonic wave toward said arterial vessel (22) extending through said peripheral portion (20) of said body, an ultrasonic wave detector (40) for detecting the ultrasonic wave reflected by said blood flowing through said arterial vessel, and means (44, 36) for determining said blood flow rate based on the detected ultrasonic wave.
Claim 4
Dependent Claim
70 words
The apparatus as set forth in claim 2, wherein said first determining means comprises a pressure sensor (12) for detecting a pulse wave produced from said arterial vessel (22), said pressure sensor being pressed against a body surface (19) of said subject just above said arterial vessel so as to detect said pulse wave, and means (36) for determining said blood pressure based on magnitude of the detected pulse wave.
Claim 5
Dependent Claim
83 words
The apparatus as set forth in claim 3, further comprising a wrist band (10) for supporting, on one (11) of opposite surfaces thereof, said ultrasonic wave generator and detector (38, 40) and said pressure sensor (12), said wrist band pressing, under said one of opposite surfaces thereof, said ultrasonic wave generator and detector and said pressure sensor against a radial artery (22) of said subject via said body surface (19) when said wrist band is placed around a wrist (20) of said subject.
Claim 6
Dependent Claim
82 words
The apparatus as set forth in claim 3 or claim 4, wherein said pressure sensor (12) comprises an elastic member (14) for defining a fluid-tight space (16), said elastic member being pressed against said arterial vessel (22) via said body surface (19) when pressure in said fluid-tight space is increased, and a pressure transducer (18) disposed in said fluid-tight space, for detecting pressure variation in said fluid-tight space upon transmission of said pulse wave to said fluid-tight space from said arterial vessel.
Claim 7
Dependent Claim
131 words
The apparatus as set forth in claim 4 or claim 5, further comprising third determining means (54, 56, 58, 60, 36) for determining oxygen saturation of blood which flows through capillaries in skin (19) of said subject, said third determining means comprising a first light emitter (54) for emitting toward said skin a light beam having a first wavelength, a second light emitter (56) for emitting toward said skin a light beam having a second wavelength different from said first wavelength, and a light detector (58) for detecting the light beams reflected from said skin, said wrist band (10) also supporting said first and second light emitters and said light detector, said third determining means further comprising means (60, 36) for determining said oxygen saturation based on the detected light beams.
Claim 8
Independent Claim
43 words
The apparatus as set forth in any one of claims 1-6, wherein said second determining means (38, 40, 44, 36) determines at least one of an average flow rate and an average flow amount of said blood flowing through said arterial vessel (22).
Claim 9
Independent Claim
68 words
The apparatus as set forth in any one of claims 1-7, further comprising a display device (50) for displaying at least one value of maximum, minimum and average blood pressure; maximum, minimum and average blood flow rate; maximum, minimum and average resistance; and maximum, minimum and average value obtained by respectively multiplying said maximum, minimum and average resistance by an average sectional area of said arterial vessel (22).
Claim 10
Dependent Claim
37 words
The apparatus as set forth in claim 8, wherein said display device (50) displays said at least one value each time said pressure sensor (12) detects a pulse of said pulse wave from said arterial vessel (22).
Claim 11
Independent Claim
41 words
The apparatus as set forth in any one of claims 1-9, wherein said second determining means (38, 40, 44, 36) determines said blood flow amount by multiplying said blood flow rate by an average sectional area of said arterial vessel (22).
References Cited (Backward Citations)
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