Surgery – Diagnostic testing – Cardiovascular
Patent
1996-12-10
1998-06-02
Nasser, Robert L.
Surgery
Diagnostic testing
Cardiovascular
600493, 600495, A61B 500
Patent
active
057591571
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
The present invention relates to a blood pressure measuring apparatus for automatically measuring a blood pressure of a living subject based on a variation of a pulse-synchronous signal, such as a Korotkoff sound or a pulse wave, produced while a pressing pressure of a cuff applied to a portion of the living subject is slowly changed.
BACKGROUND OF THE INVENTION
In a conventional blood pressure measuring apparatus, a blood pressure value may be incorrectly determined based on a pulse-synchronous signal inaccurately detected due to noise resulting from, e.g., a body movement, or the like. To avoid such incorrect blood pressure measurement, it is needed to provide the blood pressure measuring apparatus with a high-performance filter circuit or a signal processing device for removing noise from the signal. Otherwise, when it is judged that a blood pressure value obtained in a blood pressure measurement is abnormal, as compared with the previously measured blood pressure values, the blood pressure measuring apparatus needs to go to the initial step of another blood pressure measurement.
Since the above mentioned high-performance filter circuit or signal processing device has a high technique and a complicate construction, the blood pressure measuring apparatus including it has the disadvantage of being complicate and expensive. Additionally, when, after an incorrect blood pressure measurement, another blood pressure measurement is carried out, a patient suffers from discomfort because the pressing pressure of a cuff is applied to the patient again.
The present invention has been developed in the above background. It is an object of the invention to provide a blood pressure measuring apparatus with a simple construction and a low price, which can minimize the discomfort of a patient even when an incorrect blood pressure value is measured due to noise or the like.
DISCLOSURE OF THE INVENTION
The above object may be achieved according to a first invention which provides a blood pressure measuring apparatus for automatically measuring a blood pressure of a living subject based on a variation of a pulse-synchronous signal produced from an artery of the living subject while a pressing pressure of a cuff applied to a portion of the living subject is slowly changed by a cuff-pressure regulating means, the blood pressure measuring apparatus being characterized by comprising: (a) first blood pressure determining means for determining a first blood pressure value of the subject based on a variation of the pulse-synchronous signal produced while the pressure of the cuff is slowly increased; (b) second blood pressure determining means for determining a second blood pressure value of the subject based on a variation of the pulse-synchronous signal produced while the pressure of the cuff is slowly decreased; and (c) blood-pressure-abnormality judging means for judging whether the first blood pressure value determined by the first blood pressure determining means is abnormal, the blood-pressure-abnormality judging means commanding the cuff-pressure regulating means to quickly decrease the pressure of the cuff, when the first blood pressure value is not abnormal, the blood-pressure-abnormality judging means commanding the cuff-pressure regulating means to slowly decrease the pressure of the cuff increased for the blood pressure determination of the first blood pressure determining means, for the blood pressure determination of the second blood pressure determining means, when the first blood pressure value is abnormal.
In the above mentioned blood pressure measuring apparatus, when it is judged by the blood-pressure-abnormality judging means that the first blood pressure value determined by the first blood pressure determining means while the pressure of the cuff is slowly increased is abnormal, the pressure of the cuff is slowly decreased for the blood pressure determination of the second blood pressure determining means. According to the first invention, even when the first blood pressure value determ
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Harada Chikao
Miwa Yoshihisa
Colin Corporation
Nasser Robert L.
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