Surgery – Truss – Pad
Patent
1991-09-05
1993-12-21
Jaworski, Francis
Surgery
Truss
Pad
A61B 800
Patent
active
052714039
ABSTRACT:
The present invention relates to a medical ultrasound imaging system having a remote transducer located on a handle unit which is connected to a system box or unit through a coaxial cable. Transmission pulses are sent from the system box to the transducer through the coaxial cable to produce sound waves which are directed into a patient's body. These sound waves are reflected from internal organs back to the transducer and converted into electrical input signals. A split-cascode preamplifier having a MOSFET driver located on the handle unit and a cascode device and resistive load located in the system box is used for preamplifying the input signals created at the remote transducer. The MOSFET driver is biased by a MOSFET switch to help eliminate noise created by the use of ordinary resistive biasing means. A diode coupling network is used to transmit pulses from the system box to the transducer while decoupling the cable capacitance from the preamplifier input. A protective diode is placed in series with the MOSFET driver to protect the driver from the transmit pulse. This diode and the coupling network enable the handle unit and system box to be coupled by a single coaxial cable. Other applications that require a remote sensor to produce input signals and amplification of the input signals prior to transmission to a separate unit may also be improved by the present invention.
REFERENCES:
patent: 4534221 (1985-08-01), Fife et al.
patent: 4817066 (1989-03-01), Takasugi et al.
patent: 4819652 (1989-04-01), Micco
patent: 4917097 (1990-04-01), Proudian et al.
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