Blood rheology measuring apparatus
AssigneeSeiko Instruments Inc.
InventorsHiroyuki Muramatsu, Takahiko Nakamura, Minao Yamamoto, Masataka Shinogi
Life of this patent
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Abstract
To provide a noninvasive type blood rheology measuring apparatus capable of simply and conveniently measuring blood rheology information without sampling blood from a subject in measuring the blood rheology and a small-sized and portable apparatus, a blood rheology measuring apparatus of the invention is on a basis of a constitution including means form on invasively detecting a flow velocity of the blood flowing in the blood vessel as a Doppler shift signal by transmitting and receiving a wave from the face of the skin and means for analyzing blood rheology by a temporal change of the flow velocity value of the blood detected by the means.
Claims9
-25. (canceled)
A blood rheology measuring apparatus comprising:
- means for detecting a flow velocity of the blood flowing in the blood vessel in a mode of a Doppler shift signal by transmitting and receiving a wave from a face of the skin;
- and
- means for analyzing a blood rheology from a temporal change of an blood flow velocity value detected by the means.
A blood rheology measuring apparatus comprising:
- means for detecting a flow velocity of the blood flowing in the blood vessel in a mode of a Doppler shift signal by transmitting and receiving a wave from a face of the skin;
- means for calculating an intensity at each of frequency components of the Doppler shift signal;
- means for extracting a maximum frequency in a signal at an intensity level equal to or larger than a threshold in the histogram or a maximum frequency when an integrated value from a low frequency component reaches a predetermined rate of a total thereof in the histogram;
- and
- means for providing a temporal change waveform of the extracted frequency;
- wherein a blood rheology is analyzed based on the maximum frequency in the frequency waveform.
A blood rheology measuring apparatus comprising:
- means for detecting a flow velocity of the blood flowing in the blood vessel in a mode of a Doppler shift signal by transmitting and receiving a wave from a face of the skin;
- means for calculating an intensity of each of frequency components of the Doppler shift signal;
- means for extracting a maximum frequency in a signal of an intensity level equal to or larger than a threshold in the histogram or a maximum frequency when an integrated value from a low frequency component reaches a predetermined rate of a total thereof in the histogram;
- and
- means for providing a temporal change waveform of the extracted frequency;
- wherein a blood rheology is analyzed by an area value of a portion at and above a line connecting a minimum value of one pulse waveform and a minimum value of a successive pulse waveform of the frequency waveform.
Dependencies are inferred from the claim text.