WILLIAM SCOTT KEMPER
Pilots at Buena Vis St, San Diego, CA
License number
California A1002033
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
3334 Buena Vista St, San Diego, CA 92109
Professional information
Variable Illumination Of A Lumen For Acoustic Blood Flow Measurement
US Patent:
5363848, Nov 15, 1994
Filed:
Nov 16, 1992
Appl. No.:
7/977142
Inventors:
Wayne M. Spani - San Diego CA
William S. Kemper - San Diego CA
William S. Kemper - San Diego CA
Assignee:
Triton Technology, Inc. - San Diego CA
International Classification:
A61B 806
US Classification:
12866109
Abstract:
In an acoustic flowmeter of the transit time or Doppler type the electro/acoustic, and/or acousto/electric, gain of one or more elongate acoustic transducers is varied spatially along the length of the transducer. When the transducer(s) are situated across the width of a lumen that is both flowing fluid and surrounded by material that attenuates sound differently that does the fluid during acoustic fluid flow measurement, the differing transducer(s') gain(s) serves to compensate for differing acoustic attenuations in different acoustic paths. Particularly during in-vivo acoustic blood flow measurement, the non-uniform acoustic gain(s) serves to compensate for the differing acoustic attenuations of blood and tissue, commonly fat, surrounding a blood vessel, and to produce a more accurate measurement of blood flow.
Compact X-Cross Transducer Array For A Transit Time Flowmeter, Particularly For Use During In-Vivo Blood Flow Measurement
US Patent:
5440936, Aug 15, 1995
Filed:
Nov 16, 1992
Appl. No.:
7/977143
Inventors:
Wayne M. Spani - San Diego CA
William S. Kemper - San Diego CA
William S. Kemper - San Diego CA
Assignee:
Triton Technology, Inc. - San Diego CA
International Classification:
G01F 100
US Classification:
7386128
Abstract:
Multiple, typically four, acoustic transducers of a time delay acoustic flowmeter are arrayed in a X-cross, crisscross, folded geometry so as to establish a lengthy multiple-leg, typically a two-leg, acoustic path within a compact volume. An ultrasonic signal is transmitted from a transducer A to a transducer B, then electrically amplified and applied to a transducer C which retransmits the ultrasonic signal to a transducer D. The compact transducer configuration is particularly suitable for use during in-vivo blood flow measurement. The acoustic signal is maintained in amplitude from one leg to the next by amplification as an electrical signal.
Interchangeable Disposable Acoustic For Use With An Ultrasonic Flowmeter, Particularly During Extracorporeal Measurement Of Blood Flow
US Patent:
5463906, Nov 7, 1995
Filed:
Jan 24, 1994
Appl. No.:
8/184992
Inventors:
Wayne M. Spani - San Diego CA
William S. Kemper - San Diego CA
William S. Kemper - San Diego CA
Assignee:
Triton Technology, Inc. - San Diego CA
International Classification:
G01F 166
US Classification:
7386127
Abstract:
An inexpensive disposable plastic flow body interchangeably flow connects in line a conduit flowing fluid, and also, concurrently, acoustically connects to one or more ultrasonic transducers, so as to serve as an acoustic chamber for use with an ultrasonic flowmeter in the measurement of fluid flow velocity and/or volume. The flow connection is preferably accomplished by plugging, preferably by inserting nozzles into surgical tubing. The external ultrasonic transducer(s) is (are) normally connected under pressured contact, typically under spring forces which are preferably of external origin. Acoustic-coupling elements in the walls of the acoustic chamber serve to match the acoustic impedance of the flow body to acoustic impedance of blood. The disposable plug-connected flow body is particularly safe, sterile and convenient for extracorporeal ultrasonic blood flow measurement.