The objective of this project is to build and evaluate a precision, microprocessor controlled gas mixer. The mixer will provide gas at a constant flowrate with a controlled concentration of up to four component gases. The mixer design is based on the relationship of mass flow to differential pressure across an orifice with fixed area and discharge coefficient. For each gas channel (total of four channels) gas flow is monitored by measuring the differential pressure across a calibrated orifice. The actual flow is fed back to the microprocessor and compared to the desired output concentrations inputed by the operator. Corrections in gas flow are obtained by repositioning the stepper motor driven flow control valve. Correction factors are stored in the microprocessor to allow accurate control of a wide variety of gases. Phase I will address design feasibility and investigate application to various medical and anesthesiological problems.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Small Business Innovation Research Grants (SBIR) - Phase I (R43)
Project #
1R43HL033049-01
Application #
3500587
Study Section
Respiratory and Applied Physiology Study Section (RAP)
Project Start
1985-07-01
Project End
1986-01-31
Budget Start
1985-07-01
Budget End
1986-01-31
Support Year
1
Fiscal Year
1985
Total Cost
Indirect Cost
Name
Tiarco, Inc.
Department
Type
DUNS #
City
Seattle
State
WA
Country
United States
Zip Code
98107
Kirchner, K A; Crosby, B A; Patel, A R et al. (1995) Segmental chloride transport in the Dahl-S rat kidney during L-arginine administration. J Am Soc Nephrol 5:1567-72