Ultrasonic diagnostic apparatus and ultrasonic probe used in same
View Patent ↗The present invention provides an ultrasonic probe contains at least one reception preamplifier that is provided per transducer element and connected to the transducer at an input side thereof and to a cable at an output side thereof, a transmission bypass unit that is connected between the cable and the transducer, blocks off a reception signal and allows a transmission signal to pass therethrough, and a floating unit that is connected between a power supply terminal of the preamplifier and a driving power source and increases impedance thereof for a high-voltage transmission signal, whereby a bias potential of the preamplifier is electrically set to a floating state and returned to an original bias potential by a reception time.
1. An ultrasonic diagnostic apparatus comprising:
an ultrasonic probe containing at least one transducer therein; and
a transceiver containing a transmission amplifier and a reception circuit therein,
wherein the ultrasonic probe and the transceiver are used in connection with each other through a cable, and
wherein the ultrasonic probe comprises:
at least one reception preamplifier that is provided per transducer element and connected to the transducer at an input side thereof and to a cable at an output side thereof;
a transmission bypass unit that is connected between the cable and the transducer, blocks off a reception signal and allows a transmission signal to pass therethrough; and
a floating unit that is connected between a power supply terminal of the reception preamplifier and a driving power source and increases impedance thereof for a high-voltage transmission signal, whereby a bias potential of the reception preamplifier is electrically set to a floating state and returned to an original bias potential by a reception time,
wherein the floating unit is constructed by a backflow preventing diode connected between the power supply terminal of the preamplifier and the driving power source, and a capacitor connected to the diode.
2. The ultrasonic diagnostic apparatus according to claim 1 , wherein the transmission bypass unit is constructed by diodes which are connected to each other in a back-to-back connection style.
3. The ultrasonic diagnostic apparatus according to claim 1 , wherein the reception preamplifier is constructed by an emitter follower circuit based on transistors.
4. The ultrasonic diagnostic apparatus according to claim 1 , wherein the reception amplifier is constructed by a source follower circuit based on FET.
5. An ultrasonic diagnostic apparatus comprising:
an ultrasonic probe containing at least one transducer therein; and
a transceiver containing a transmission amplifier and a reception circuit therein,
wherein the ultrasonic probe and the transceiver are used in connection with each other through a cable, and
wherein the ultrasonic probe comprises:
at least one reception preamplifier that is provided per transducer element and connected to the transducer at an input side thereof and to a cable at an output side thereof; and
a floating unit that is connected between a power supply terminal of the preamplifier and a driving power source and increases impedance thereof for a high-voltage transmission signal, whereby a bias potential of the preamplifier is electrically set to a floating state and returned to an original bias potential by a reception time,
wherein the reception preamplifier allows a transmission signal to pass from a cable side to a transducer side under the floating state,
wherein the floating unit is constructed by a backflow preventing diode connected between the power supply terminal of the preamplifier and the driving power source, and a capacitor connected to the diode.
6. The ultrasonic diagnostic apparatus according to claim 5 , wherein the reception amplifier is constructed by an emitter follower circuit based on high withstanding voltage transistors.
7. The ultrasonic diagnostic apparatus according to claim 6 , wherein the emitter follower circuit is constructed by an emitter follower circuit in which a PNP transistor and an NPN transistor are connected to each other in series so that emitters thereof are commonly connected to each other.
8. An ultrasonic probe comprising:
at least one transducer contained in a case,
wherein the case comprises:
at least one reception preamplifier that is provided per transducer element and connected to the transducer at an input side thereof and to a cable at an output side thereof;
a transmission bypass unit that is connected between the cable and the transducer, blocks off a reception signal, and allows a transmission signal to pass therethrough; and
a floating unit that is connected between a power supply terminal of the reception preamplifier and a driving power source and increases impedance thereof for a high-voltage transmission signal, whereby a bias potential of the reception preamplifier is electrically set to a floating state and returned to an original bias potential by a reception time,
wherein the floating unit is constructed by a backflow preventing diode connected between the power supply terminal of the preamplifier and the driving power source, and a capacitor connected to the diode.