Electronic sphygmomanometer
First Claim
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1. An electronic sphygmomanometer adapted to measure a blood pressure of a person to be measured, comprising:
- a cuff to be wrapped around a predetermined body site of the person to be measured;
a pressure sensor that detects a pressure inside the cuff;
a measurement controller that controls a blood pressure measurement of the person to be measured based on a signal from the pressure sensor;
a power supplier comprising a primary battery and a secondary battery;
a voltage detector that detects a voltage of the primary battery;
a pressurizer that pressurizes the cuff using power supplied from the power supplier;
a switching controller that selects a supply source of the power to operate the electronic sphygmomanometer by switching the primary battery and the secondary battery,wherein the switching controller firstly compares the voltage of the primary battery detected by the voltage detector with a first threshold upon startup of the electronic sphygmomanometer, selects the primary battery when the voltage of the primary battery is greater than the first threshold, after the startup and before pressurization by the pressurizer, the switching controller secondly compares the voltage of the primary battery detected by the voltage detector with a second threshold, which is larger than the first threshold and higher than a required voltage necessary to drive the pressurizer, and selects the secondary battery when the voltage of the primary battery is less than the second threshold.
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Abstract
A power supply unit of an electronic sphygmomanometer includes a dry cell as a primary battery, a rechargeable battery as a secondary battery, and a power supply control circuit. A voltage detector detects a voltage (characteristic value) of the rechargeable battery, and a voltage detector detects the voltage of the dry cell. A switching control unit performs switching control of the dry cell and the rechargeable battery based on a detection result by the voltage detectors.
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8 Claims
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1. An electronic sphygmomanometer adapted to measure a blood pressure of a person to be measured, comprising:
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a cuff to be wrapped around a predetermined body site of the person to be measured; a pressure sensor that detects a pressure inside the cuff; a measurement controller that controls a blood pressure measurement of the person to be measured based on a signal from the pressure sensor; a power supplier comprising a primary battery and a secondary battery; a voltage detector that detects a voltage of the primary battery; a pressurizer that pressurizes the cuff using power supplied from the power supplier; a switching controller that selects a supply source of the power to operate the electronic sphygmomanometer by switching the primary battery and the secondary battery, wherein the switching controller firstly compares the voltage of the primary battery detected by the voltage detector with a first threshold upon startup of the electronic sphygmomanometer, selects the primary battery when the voltage of the primary battery is greater than the first threshold, after the startup and before pressurization by the pressurizer, the switching controller secondly compares the voltage of the primary battery detected by the voltage detector with a second threshold, which is larger than the first threshold and higher than a required voltage necessary to drive the pressurizer, and selects the secondary battery when the voltage of the primary battery is less than the second threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification