Patents by Inventor Yam Lee

Yam Lee has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Methods and apparatus for sensing intracardiac signals for an inplantable cardiac pacemaker
    Patent number: 5388586
    Abstract: A circuit for use in an implantable cardiac pacemaker for use in processing intracardiac signals and methods of processing such signals. The circuit includes a passive filter 1 has a bandwidth of 0.1 to 80 Hz approximately. An amplifier 2 with switched capacitors presents at the output a dynamics of 0.8V approximately and a gain lower than 50. An analog-to-digital converter 3 with delta modulation, which is controllably variable in step and functions at two frequencies, one of 1 kHz approximately, the other of 4 kHz approximately. The circuit may be used for both processing said signals to identify spontaneous cardiac events and to telemeter an intracardiac ECG.
    Type: Grant
    Filed: December 23, 1993
    Date of Patent: February 14, 1995
    Assignee: ELA Medical
    Inventors: Chik-Yam Lee, Laurent Claudon, Renzo D. Molin