Transmit/receive ultrasound front end circuit providing automatic transmit/receive switching
June 27, 2017. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3596206 Method and circuit for driving a piezoelectric transducer High speed, non-saturating, bipolar transistor logic circuit Ultrasonic ranging system C W and pulse Doppler diagnostic system Digital input stage for an ultrasound apparatus Duplexer including a field-effect transistor for use in an ultrasound imaging system Duplexer including a variable capacitance diode for an ultrasound imaging system Second harmonic imaging transducers Patent #: 5825117 InventorAssigneeApplicationNo. 883779 filed on 06/27/1997US Classes:600/437UltrasonicExaminersPrimary: Lateef, Marvin M.Assistant: Imam, Ali M. Foreign Patent References
International ClassA61B 008/00AbstractA transmit/receive circuit employing passive elements. A transmit/receive circuit according to an embodiment of the present invention includes a transformer having a primary winding coupled to an input stage and an output stage. A transducer is coupled to the secondary winding of the transformer. A diode limiter is coupled to the input stage and a diode bridge is coupled to a node at the output stage. The input and output stages are alternatingly grounded. An output switch including an inverse parallel circuit of two diodes having opposite polarities may be connected at the output stage between a transmitter and the transformer. Alternatively, a complementary common emitter amplifier may be provided at the output stage. The circuit thus electrically couples the transducer element to the receiver during reception and electrically decouples both the transducer and the transmitter from the receiver during transmission. The circuit further electrically couples the transducer to the transmitter during transmission and electrically decouples both the transducer element and the receiver from the transmitter during reception.Field of SearchPulse DopplerUltrasonic With acoustical or display imaging Probe placed in vascular system or body orifice ACOUSTIC IMAGE CONVERSION With beam forming, shaping, steering, or scanning ECHO SYSTEMS Input circuit for mechanical output from piezoelectric element TRI-STATE (I.E., HIGH IMPEDANCE AS THIRD STATE) Electromechanical resonator controlled | |
