06511432 is referenced by 8 patents and cites 3 patents.

An ultrasound catheter is disclosed wherein a rotatable transducer couples to the input of a preamplifier. Protection circuits at the input and output of the preamplifier protect the preamplifier from the transducer excitation signal. The preamplifier couples to the distal end of a transmission line. In an alternate embodiment, at least one switch responds to the presence of the transducer excitation signal by coupling the transducer excitation signal to the rotatable transducer and protecting the preamplifier from the transducer excitation signal. The at least one switch responds to the absence of the transducer excitation signal by coupling a received signal produced by the rotatable transducer to the input of the preamplifier. The at least one switch further responds to the absence of the transducer excitation signal by coupling the output of the preamplifier to the distal end of the transmission line.

Title
Preamplifier and protection circuit for an ultrasound catheter
Application Number
9/844416
Publication Number
6511432 (B2)
Application Date
April 27, 2001
Publication Date
January 28, 2003
Inventor
Donald Masters
Sunnyvale
CA, US
Veijo Suorsa
Sunnyvale
CA, US
Thomas C Moore
Fremont
CA, US
Agent
Orrick Herrington & Sutcliffe
US
Assignee
Scimed Life Systems
MN, US
IPC
A61B 8/00
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