Manufactured by Biotrine and re-sold by Medical Equipment Designs. Used a ceramic pneumotach with an integral temperature sensor. From Office Spirometry. A practical guide to the selection and use of spirometers. By PL Enright and RE Hyatt. Published by Lea and Febiger, 1987. Page 135.
Tag Archives: Biotrine
Peak Flow Meter, Biotrine, early 1980’s
Photo is courtesy of Richard H. Lord of µPward Concepts. His description: “It is 6.5″ long by 1″ in diameter consisting of a 4.5″ long cardboard tube with a plastic mouthpiece tube inserted in one end. A plug was inserted in the other end containing a buzzy reed whistle much as you might find in a duck-call or a party favor, but mounted so that the air to actuate it passed through a small hole that could be sized to calibrate its sensitivity, so that a fixed known air pressure was required for the reed to buzz. The cardboard tube also has a series of ten oval holes running along its length, each of slightly increasing width, through which air could escape. A piece of tape was used to cover one or more of these holes starting at the far end of the tube. With all holes covered except the one nearest the mouthpiece, a flow rate of one L/s was required to cause to make the buzzing sound. Uncovering each additional hole added the need of an additional L/s of flow to create the buzz, with a total of 10 L/s required if all ten holes were uncovered. The doctor would establish a target value by taping over the appropriate number of holes, and the patient could then take the tube home with him or her and could practice achieving that target flow rate. Simple and yet very effective !!!”
Spirometer, deVilbiss Surveyor I, late 1970’s
Photograph courtesy of Richard H. Lord of µPward Concepts. Developed by Biotrine Inc. for deVilbiss. It had an embedded 6800 (8-bit) processor and used a ceramic pneumotachograph. It had a 40 character single-line display. A small text printer and an HP pen plotter were options.