London Seymour B: Method for central venous pressure monitoring. July 6, 1971: US3590809 (40 worldwide citation)

Method of central venous pressure monitoring including inserting a catheter in the right atrial cardiac chamber, supporting a vertical column of liquid above said chamber, transmitting light through the column and the liquid, discriminately sensing that light which has been transmitted through the l ...

London Seymour B: Valve for biological systems. April 20, 1971: US3575161 (28 worldwide citation)

An electronically controlled, contamination-free valve for biological systems of the type feeding fluid through a plurality of compressible tubes and comprising a rocker arm pivotable so as to compress the tubing and control fluid flow, as a photocell circuit senses variant light transmission charac ...

London Seymour B, London Rose E: Method of phantom level sensing in a central venous pressure monitoring system. August 31, 1971: US3602214 (13 worldwide citation)

Method of sensing phantom level in central venous pressure monitoring systems of the type supporting liquid in column relatively to the right atrial chamber of the heart. The method includes projecting of a reference light beam from the liquid column gravimetric zero reference point to the right atr ...