Electronic sphygmomanometer for measuring blood pressure and pulse
First Claim
1. An electronic sphygmomanometer for measuring a blood pressure and a pulse rate, comprising:
- a cuff comprising an air bladder for wrapping around a measurement location of a patient;
a pressure sensor mounted on the cuff that measures an inner pressure of the air bladder;
an artery volume sensor mounted on the cuff that detects a pulse wave signal of the patient based on a change of volume of an artery;
a processor connected to the pressure sensor and the artery volume sensor that is programmed to calculate the blood pressure and the pulse rate based on the signal received from the pressure sensor and the artery volume sensor, the processor being further programmed to;
increase or decrease the inner pressure of the air bladder at a predetermined timing;
receive the pulse wave signal detected by the artery volume sensor;
receive a pressure pulse wave signal, which is superimposed on the inner pressure of the air bladder and detected by the pressure sensor;
choose only one of the detected pulse wave signal and the detected pressure pulse wave signal as a signal for calculating the pulse rate of the patient in accordance with a predetermined method during a period when the inner pressure of the air bladder is increased or decreased,wherein the predetermined method comprises;
comparing the detected pressure pulse wave signal with a first predetermined reference value,wherein if the detected pressure pulse wave signal is below the first predetermined reference value, the detected pulse wave signal is the chosen signal, andwherein if the detected pressure pulse wave signal is above the first predetermined reference value, comparing the detected pulse wave signal with a second predetermined reference value,wherein if the detected pulse wave signal is below the second predetermined reference value, the detected pressure pulse wave signal is the chosen signal, andwherein if the detected pulse wave signal is above the second predetermined reference value, comparing a signal to noise ratio of the detected pressure pulse wave signal with a signal to noise ratio of the detected pulse wave signal to determine the chosen signal,wherein if the signal to noise ratio of the detected pressure pulse wave signal is greater than the signal to noise ratio of the detected pulse wave signal, the detected pressure pulse wave signal is the chosen signal, andwherein if the signal to noise ratio of the detected pulse wave signal is greater than the signal to noise ratio of the detected pressure pulse wave signal, the detected pulse wave signal is the chosen signal;
calculate the pulse rate of the patient based on the chosen signal; and
calculate the blood pressure based on the received pressure pulse wave signal.
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Accused Products
Abstract
An electronic sphygmomanometer includes a cuff including an air bladder, a pressure sensor, an artery volume sensor, and a computation device. The computation device includes an inner pressure control section, a volume sensor signal receive section for receiving a pulse wave signal detected by the artery volume sensor, a pressure sensor signal receive section for receiving a pressure pulse wave signal superimposed on the inner pressure of the air bladder and detected by the pressure sensor, a judgment section for choosing either the pulse wave signal or the pressure pulse wave signal as a signal for calculating pulse rate of the patient during a period when the inner pressure of the air bladder is increased and/or decreased by the inner pressure control section, and a pulse rate calculation section for calculating pulse rate of the patient based on the pulse wave signal and the signal chosen by the judgment section.
20 Citations
10 Claims
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1. An electronic sphygmomanometer for measuring a blood pressure and a pulse rate, comprising:
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a cuff comprising an air bladder for wrapping around a measurement location of a patient; a pressure sensor mounted on the cuff that measures an inner pressure of the air bladder; an artery volume sensor mounted on the cuff that detects a pulse wave signal of the patient based on a change of volume of an artery; a processor connected to the pressure sensor and the artery volume sensor that is programmed to calculate the blood pressure and the pulse rate based on the signal received from the pressure sensor and the artery volume sensor, the processor being further programmed to; increase or decrease the inner pressure of the air bladder at a predetermined timing; receive the pulse wave signal detected by the artery volume sensor; receive a pressure pulse wave signal, which is superimposed on the inner pressure of the air bladder and detected by the pressure sensor; choose only one of the detected pulse wave signal and the detected pressure pulse wave signal as a signal for calculating the pulse rate of the patient in accordance with a predetermined method during a period when the inner pressure of the air bladder is increased or decreased, wherein the predetermined method comprises; comparing the detected pressure pulse wave signal with a first predetermined reference value, wherein if the detected pressure pulse wave signal is below the first predetermined reference value, the detected pulse wave signal is the chosen signal, and wherein if the detected pressure pulse wave signal is above the first predetermined reference value, comparing the detected pulse wave signal with a second predetermined reference value, wherein if the detected pulse wave signal is below the second predetermined reference value, the detected pressure pulse wave signal is the chosen signal, and wherein if the detected pulse wave signal is above the second predetermined reference value, comparing a signal to noise ratio of the detected pressure pulse wave signal with a signal to noise ratio of the detected pulse wave signal to determine the chosen signal, wherein if the signal to noise ratio of the detected pressure pulse wave signal is greater than the signal to noise ratio of the detected pulse wave signal, the detected pressure pulse wave signal is the chosen signal, and wherein if the signal to noise ratio of the detected pulse wave signal is greater than the signal to noise ratio of the detected pressure pulse wave signal, the detected pulse wave signal is the chosen signal; calculate the pulse rate of the patient based on the chosen signal; and calculate the blood pressure based on the received pressure pulse wave signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification