Lyell J Thomas

US Patent:

39633802, Jun 15, 1976

Filed:

Jan 6, 1975

Appl. No.:

5/538945

Inventors:

Lyell J. Thomas - San Pedro CA
Samuel P. Bessman - Los Angeles CA

International Classification:

F04B 1700
F04B 3500
F04B 3908
F04B 4506

US Classification:

417322

Abstract:

The pump has a piezoelectric variable volume chamber and a solenoid controlled valve operated in sequence to pump small volumes of liquid. The sequence is produced by developing a phase difference between the control of the piezoelectrical chamber and the solenoid valve.

US Patent:

43447430, Aug 17, 1982

Filed:

Dec 4, 1979

Appl. No.:

6/100094

Inventors:

Samuel P. Bessman - Los Angeles CA
Lyell J. Thomas - San Pedro CA

International Classification:

F04B 1700

US Classification:

417317

Abstract:

A piezoelectric driven variable volume having a chamber pump with a flexible tube and a non-compressible fluid therein. Solenoid operated valves are associated with the inlet and outlet of the flexible tube. A control circuit sequences the valves and the piezoelectric drive to pump small volumes of liquid through the flexible tube by a diaphragm-type action.

US Patent:

46641190, May 12, 1987

Filed:

Dec 4, 1985

Appl. No.:

6/805070

Inventors:

Samuel P. Bessman - Los Angeles CA
Lyell J. Thomas - San Pedro CA
Ennis C. Layne - San Gabriel CA

Assignee:

University of Southern California - Los Angeles CA

International Classification:

A61B 500

US Classification:

128635

Abstract:

A galvanic electrode oxygen sensor which is useful in measuring transcutaneous oxygen pressure (pO. sub. 2) contains a cathode in the form of a porous film of a metal below hydrogen in the Electromotive Series, an anode of a metal above hydrogen in the Electromotive Series, an electrolyte and an oxygen-permeable membrane in contact with the cathode and adapted to contact the skin of a patient. The sensor may also contain temperature measuring device or structure for compensating for temperature variations.

US Patent:

44310048, Feb 14, 1984

Filed:

Oct 27, 1981

Appl. No.:

6/315282

Inventors:

Samuel P. Bessman - Los Angeles CA
Ennis C. Layne - San Gabriel CA
Lyell J. Thomas - San Pedro CA

International Classification:

A61B 500

US Classification:

128635

Abstract:

A method and apparatus for more accurate measurements of the glucose content in body fuids by sensing the absolute level of oxygen concentration in the fluid and correcting the output differential measurement indicative of the glucose content in the fluid according to the absolute level of oxygen. In the two electrode systems known to the art, the unaltered oxygen electrode of the electrode pair may be employed to read the absolute level of oxygen concentration and in addition, function to establish the difference in oxygen concentration caused by glucose oxidation. In view of the fact that temperature may vary, a thermistor may be included in the electrode system to make temperature corrections for reason that the absolute oxygen reading from either a polarographic or galvanic oxygen electrode is extremely sensitive to temperature and the rate of glucose oxidation is temperature sensitive.