Pulse detection device and method of manufacturing the same
First Claim
1. A pulse detection device comprising:
- a piezoelectric element for transmitting ultrasound into a living body in accordance with a drive signal, or receiving reflected waves of ultrasound reflected by a bloodstream in the living body; and
a base plate having said piezoelectric element mounted on its one surface, wherein the other surface of said base plate opposite from said one surface is brought into contact with the living body.
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Accused Products
Abstract
There are provided a pulse detection device in which an ultrasound transmitting piezoelectric element and an ultrasound receiving piezoelectric element are precisely placed to limit variation in quality, and a method of manufacturing the pulse detection device. Further, the pulse detection sensitivity is improved in the pulse detection device. In the pulse detection device of the present invention, a transmitting piezoelectric element excited in accordance with a drive signal to generate ultrasound and to transmit the ultrasound into a living body, and a receiving piezoelectric element for receiving reflected waves of the ultrasound transmitted into the living body and reflected by a bloodstream in the living body are placed on a surface of a transmitting/receiving base plate. A processing computation section compares the frequency of the ultrasound generated by the transmitting piezoelectric element and the frequency of the reflected waves received by the receiving piezoelectric element to detect a pulse.
11 Citations
18 Claims
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1. A pulse detection device comprising:
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a piezoelectric element for transmitting ultrasound into a living body in accordance with a drive signal, or receiving reflected waves of ultrasound reflected by a bloodstream in the living body; and
a base plate having said piezoelectric element mounted on its one surface, wherein the other surface of said base plate opposite from said one surface is brought into contact with the living body.
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2. A pulse detection device comprising:
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a transmitting piezoelectric element excited in accordance with a drive signal to generate ultrasound and to transmit the ultrasound into a living body;
a receiving piezoelectric element for receiving reflected waves of the ultrasound transmitted into the living body and reflected by a bloodstream in the living body, and for converting the reflected waves into an electrical signal;
a detection section for detecting a pulse from the ultrasound generated by said transmitting piezoelectric element and the reflected waves received by said receiving piezoelectric element; and
a transmitting/receiving base plate having said transmitting piezoelectric element and said receiving piezoelectric element provided on its one surface, the other surface of said transmitting/receiving base plate being brought into contact with the living body. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of manufacturing a pulse detection device comprising the steps of:
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forming wiring metal films on a transmitting/receiving base plate, and an electrode metal film on a transmitting piezoelectric element and on a receiving piezoelectric element; and
placing said transmitting piezoelectric element and said receiving piezoelectric element on said transmitting/receiving base plate such that said metal films are laid on each other, and joining said transmitting piezoelectric element and said receiving piezoelectric element to said transmitting/receiving base plate by using intermetallic bonding between said metal films to fix said transmitting piezoelectric element and said receiving piezoelectric element on said transmitting/receiving base plate and to establish an electrical connection between the transmitting/receiving base plate and each of said transmitting piezoelectric element and said receiving piezoelectric element.
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Specification