Roger A Wolthuis, Age 8715430 162Nd St, Woodinville, WA 98072
Roger Wolthuis Phones & Addresses
15430 162Nd St, Woodinville, WA 98072 (425) 483-5625 (425) 483-6625 (360) 815-1532
15430 NE 162Nd St, Woodinville, WA 98072 (425) 483-6625
Work
Company:
Rjc enterprises
Address:
11711 N Creek Pkwy S # D103, Bothell, WA 98011
Phones:
(425) 481-3281
Position:
Manager
Industries:
Plastics Materials, Synthetic Resins, and Nonvulcanizable Elastomers
Education
Degree:
High school graduate or higher
Emails
Mentions for Roger A Wolthuis
Publications & IP owners
Us Patents
Apparatus And Method For Determining Physiologic Characteristics Of Body Lumens
US Patent:
5275169, Jan 4, 1994
Filed:
Jan 15, 1992
Appl. No.:
7/822032
Inventors:
Martin A. Afromowitz - Mercer Island WA
Roger A. Wolthuis - Woodinville WA
Gordon L. Mitchell - Woodinville WA
Roger A. Wolthuis - Woodinville WA
Gordon L. Mitchell - Woodinville WA
Assignee:
Innovation Associates - Bellevue WA
International Classification:
A61M 2900
US Classification:
128673
Abstract:
A system includes a catheter (10) having a low pressure balloon (42) at of one end thereof, a precise, low pressure, low volume fluid infusion means (41) and a pressure sensor (43). The balloon (42) is introduced to a body lumen, such as a blood vessel, and inflated to a pressure at or just above physiologic, typically being below 200 mmhg. From the balloon volume at a particular pressure, the internal cross-sectional area and diameter of the vessel can be calculated. Additional calculations can be made at other pressures below 200 mmhg to determine compliance of the vessel.
Optical Ph And Gas Concentration Sensor
US Patent:
5039492, Aug 13, 1991
Filed:
Jan 27, 1989
Appl. No.:
7/303584
Inventors:
Elric W. Saaski - Bothell WA
David A. McCrae - Seattle WA
James C. Hartl - Snohomish WA
Dale M. Lawrence - Lynnwood WA
Roger A. Wolthuis - Woodinville WA
David A. McCrae - Seattle WA
James C. Hartl - Snohomish WA
Dale M. Lawrence - Lynnwood WA
Roger A. Wolthuis - Woodinville WA
Assignee:
MetriCor, Inc. - Woodinville WA
International Classification:
G01N 2100
A67B 500
G02B 500
A67B 500
G02B 500
US Classification:
422 8209
Abstract:
An optical pH sensor and a gas sensor utilizing the pH sensor. The pH sensor includes an indicator whose absorbance is a function of the concentration of hydronium ions in a media surrounding the indicator. Light transmitted and reflected through the indicator of the sensor undergoes an absorption that is characteristic of the concentration of the hydrogen ion. The pH sensor can be used as to sense the concenration of a gas in a sample by surrounding the indicator with a liquid or liquid-containing media that changes pH as it is exposed to the gas, and separating the indicator and liquid or liquid-containing media from the gas with a membrane that is permeable to the gas to be measured. A measuring system used with the sensors transmits coherent radiation to the sensor through an optical fiber, separates the radiation returning from the sample into two wavelength bands, and digitally samples the photocurrents produced within the two wavelength bands. A microprocessor performs ratiometric calculations to measure the pH or gas concentration.
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