Device for detecting pulse waves
First Claim
1. A device for detecting pulse waves, comprising:
- a first sensor positionable on a user'"'"'s wrist above the user'"'"'s radial artery and having first emitting means for emitting an ultrasound signal toward the radial artery and first receiving means for receiving an ultrasound signal emitted from the first emitting means and reflected by blood flowing in the radial artery;
a second sensor positionable on the user'"'"'s wrist above the user'"'"'s ulnar artery and having second emitting means for emitting an ultrasound signal toward the ulnar artery and second receiving means for receiving an ultrasound signal emitted from the second emitting means and reflected by blood flowing in the ulnar artery;
pulse wave information acquisition means for acquiring pulse wave information based on pulse waves from the ultrasound signals received by one of the first receiving means and the second receiving means; and
output means for outputting the pulse wave information acquired by the pulse wave information acquisition means;
wherein the first and second sensors are adjacent each other along a line extending about a circumference of the user'"'"'s wrist.
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Accused Products
Abstract
A pulse wave detection device capable of accurately detecting pulse waves without influence of noise caused by hand movement or the like has a main sensor disposed on a radial artery and having an emitter for emitting an ultrasonic signal toward the radial artery and a receiver for receiving a reflected ultrasonic signal, and an auxiliary sensor disposed on an ulnar artery and having an emitter for emitting an ultrasonic signal toward the ulnar artery and a receiver for receiving a reflected ultrasonic artery. If the amplitude of an ultrasonic signal received by the main sensor is not between two threshold values, it is determined that detection of pulse waves from the radial artery is difficult. Then detection of pulse waves from the ulnar artery is performed by using the auxiliary sensor. After the lapse of a predetermined period of time from the start of detection using the ulnar artery, the main sensor is again selected to be used. If detection with the main sensor is possible, detection with the main sensor is continued. If detection with the main sensor is difficult even after the predetermined time period, the auxiliary sensor is again selected. If detection with the auxiliary sensor is also difficult, a buzzer is caused to sound to inform the user of this condition.
32 Citations
26 Claims
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1. A device for detecting pulse waves, comprising:
- a first sensor positionable on a user'"'"'s wrist above the user'"'"'s radial artery and having first emitting means for emitting an ultrasound signal toward the radial artery and first receiving means for receiving an ultrasound signal emitted from the first emitting means and reflected by blood flowing in the radial artery;
a second sensor positionable on the user'"'"'s wrist above the user'"'"'s ulnar artery and having second emitting means for emitting an ultrasound signal toward the ulnar artery and second receiving means for receiving an ultrasound signal emitted from the second emitting means and reflected by blood flowing in the ulnar artery;
pulse wave information acquisition means for acquiring pulse wave information based on pulse waves from the ultrasound signals received by one of the first receiving means and the second receiving means; and
output means for outputting the pulse wave information acquired by the pulse wave information acquisition means;
wherein the first and second sensors are adjacent each other along a line extending about a circumference of the user'"'"'s wrist. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- a first sensor positionable on a user'"'"'s wrist above the user'"'"'s radial artery and having first emitting means for emitting an ultrasound signal toward the radial artery and first receiving means for receiving an ultrasound signal emitted from the first emitting means and reflected by blood flowing in the radial artery;
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8. A device for detecting pulse waves, comprising:
- a first sensor positionable on a user'"'"'s wrist above the user'"'"'s radial artery and having a first transmitter for transmitting ultrasound signals toward the user'"'"'s radial artery and a first receiver for receiving ultrasound signals transmitted from the first transmitter and reflected by blood flowing in the radial artery;
a second sensor positionable on the user'"'"'s wrist above the user'"'"'s radial artery and having a second transmitter for transmitting ultrasound signals toward the user'"'"'s ulnar artery and a second receiver for receiving ultrasound signals transmitted from the second transmitter and reflected by blood flowing in the ulnar artery;
a pulse wave information acquisition circuit for acquiring pulse wave information in accordance with pulse waves detected from the ultrasound signals received by one of the first receiver and the second receiver; and
an output circuit for outputting the pulse wave information acquired by the pulse wave information acquisition circuit;
wherein the first and second sensors are adjacent each other along a line extending about a circumference of the user'"'"'s wrist.
- a first sensor positionable on a user'"'"'s wrist above the user'"'"'s radial artery and having a first transmitter for transmitting ultrasound signals toward the user'"'"'s radial artery and a first receiver for receiving ultrasound signals transmitted from the first transmitter and reflected by blood flowing in the radial artery;
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21. A wrist-wearable pulse detector comprising:
- a housing;
a wrist strap attached to the housing for removably attaching the housing to a user'"'"'s wrist;
a first sensor provided on the wrist strap so as to be positioned over the user'"'"'s radial artery when the pulse detector is attached to the user'"'"'s wrist, the first sensor having a first emitter for emitting an ultrasound signal toward the radial artery and a first receiver for receiving a first ultrasound signal emitted from the first emitter and reflected by blood flowing in the radial artery;
a second sensor provided on the wrist strap so as to be positioned over the user'"'"'s ulnar artery when the pulse detector is attached to the user'"'"'s wrist, the second sensor having a second emitter for emitting an ultrasound signal toward the ulnar artery and a second receiver for receiving a second ultrasound signal emitted from the second emitter and reflected by blood flowing in the ulnar artery; and
a control circuit for selectively driving one of the first and second sensors based on the relative strength of the received first and second ultrasound signals and calculating pulse information based on the ultrasound signal received by the driven sensor. - View Dependent Claims (22, 23, 24, 25, 26)
- a housing;
Specification