Diagnostic apparatus for measuring changes of arterial and venous blood volumes in brain with respiration signal modulation
First Claim
1. An apparatus used for diagnosing a living subject, comprising:
- light source means for emitting light of different wavelength;
light introducing/receiving means for introducing said light into a brain of the living subject and receiving light transmitted through the brain;
detecting means for detecting occurrences of respirations of the living subject and outputting a respiration signal indicative of said occurrences of said respirations;
deriving means for deriving the transmitted light from said introducing/receiving means in synchronism with the respiration signal and outputting a modulated light transmission signal indicative of the transmitted light which is modulated by the respiration signal;
analyzing means for analyzing the modulated light transmission signal and providing an operation result, the operation result indicating variations in concentration of oxygenated media Δ
X02 and disoxygenated media Δ
X contained in venous blood of the brain;
operation means for performing an arithmetic operation of
space="preserve" listing-type="equation">K.sub.1 ×
Δ
X.sub.02 /{Δ
X+Δ
X.sub.02 } where K1 is a first predetermined constant, a result of the arithmetic operation indicating an oxygen saturation in the venous blood of the brain; and
displaying means for displaying the result of the arithmetic operation.
1 Assignment
0 Petitions
Accused Products
Abstract
A diagnostic apparatus includes light sources which emit near infrared light rays of different wavelengths. The light rays are introduced into human brain to be subjected to diagnosis and the light rays transmitted through the brain are picked up. There are provided a first detector which detects occurrences of respirations of the subject and outputs a respiration signal, and a second detector which detects occurrences of heartbeats of the subject and outputs a heartbeat signal. The light transmitted through the brain is derived in synchronism with both the respiration signal and the heartbeat signal and first and second modulated light transmission signals are produced which are respectively modulated by the respiration signal and the heartbeat signal. The first and second modulated light transmission signals are separately analyzed to provide variations in concentration of oxygenated media ΔX02 and disoxygenated media ΔX contained in venous and arterial blood of the brain, respectively. Based thereon, oxygen saturations of both venous and arterial blood flowing in the brain are separately computed and displayed in a monitor screen.
-
Citations
6 Claims
-
1. An apparatus used for diagnosing a living subject, comprising:
-
light source means for emitting light of different wavelength; light introducing/receiving means for introducing said light into a brain of the living subject and receiving light transmitted through the brain; detecting means for detecting occurrences of respirations of the living subject and outputting a respiration signal indicative of said occurrences of said respirations; deriving means for deriving the transmitted light from said introducing/receiving means in synchronism with the respiration signal and outputting a modulated light transmission signal indicative of the transmitted light which is modulated by the respiration signal; analyzing means for analyzing the modulated light transmission signal and providing an operation result, the operation result indicating variations in concentration of oxygenated media Δ
X02 and disoxygenated media Δ
X contained in venous blood of the brain;operation means for performing an arithmetic operation of
space="preserve" listing-type="equation">K.sub.1 ×
Δ
X.sub.02 /{Δ
X+Δ
X.sub.02 }where K1 is a first predetermined constant, a result of the arithmetic operation indicating an oxygen saturation in the venous blood of the brain; and displaying means for displaying the result of the arithmetic operation. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification