Instrument to detect and represent the cross-sectional variations of a blood vessel
First Claim
1. An instrument for detection of vessel blood velocity and display of a circular cross-section representation of relative changes with time of the effective cross-section of a column of blood through a blood vessel under examination, comprising:
- a Doppler means for detecting velocity of the blood flowing through the vessel under examination as a function of time and for providing a Doppler output signal s(t) representative thereof;
electronic means for processing the said Doppler output signal s(t) and for providing as a function of said time t an output signal R(t) derived from said Doppler output signal s(t) without anatomic measurement, which is proportional to the variations in the radius of said circular cross-section representation of the column of blood flowing through the blood vessel and which reflects a positive value at any given moment; and
means responsive to the output signal R(t) for displaying said circular cross-section representation such that changes with time of R(t) are represented by equivalent changes in the radius of said representation.
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Accused Products
Abstract
The invention falls within the art field of electronic detection and measuring instruments for medical use. Connected to the audio output of a conventional Doppler device, the instrument disclosed processes the Doppler signal (Pt) and produces an output signal (Rt) in the form of a quantity per unit of time which is proportional to the radius of a circular cross-section equivalent in area to the effective cross-section of the blood vessel under examination. The instrument provides a video image of this `relative` cross-section as well as producing a numerical read-out proportional to the maximum and the minimum radius of the relative cross-section which register during heartbeat.
41 Citations
9 Claims
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1. An instrument for detection of vessel blood velocity and display of a circular cross-section representation of relative changes with time of the effective cross-section of a column of blood through a blood vessel under examination, comprising:
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a Doppler means for detecting velocity of the blood flowing through the vessel under examination as a function of time and for providing a Doppler output signal s(t) representative thereof; electronic means for processing the said Doppler output signal s(t) and for providing as a function of said time t an output signal R(t) derived from said Doppler output signal s(t) without anatomic measurement, which is proportional to the variations in the radius of said circular cross-section representation of the column of blood flowing through the blood vessel and which reflects a positive value at any given moment; and means responsive to the output signal R(t) for displaying said circular cross-section representation such that changes with time of R(t) are represented by equivalent changes in the radius of said representation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification