Disposable pneumotachograph flowmeter
First Claim
Patent Images
1. A pneumotachograph flowmeter comprising:
- (a) a tubular mouthpiece member having a lumen extending the length thereof;
(b) a fabric screen of expanded, PTFE fibers extending transverse to said lumen and having a multiplicity of pores, the size providing a predetermined resistance to fluid flow therethrough with the flow being laminar through said lumen; and
(c) pressure sensing ports in said mouthpiece member disposed on opposite sides of said screen.
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Abstract
A disposable pneumotachograph flowmeter comprises first and second tubular mouthpiece members which, when juxtaposed relative to one another, sandwich a fabric screen made from a hydrophobic material therebetween. The screen may comprise a woven fabric formed from expanded PTFE fibers or, alternatively, may be a non-woven mat of polyester fibers. Because of the properties of the screen material, it does not become clogged and occluded with moisture particles during use.
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Citations
5 Claims
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1. A pneumotachograph flowmeter comprising:
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(a) a tubular mouthpiece member having a lumen extending the length thereof; (b) a fabric screen of expanded, PTFE fibers extending transverse to said lumen and having a multiplicity of pores, the size providing a predetermined resistance to fluid flow therethrough with the flow being laminar through said lumen; and (c) pressure sensing ports in said mouthpiece member disposed on opposite sides of said screen. - View Dependent Claims (2, 3, 4)
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5. A pneumotachograph flowmeter comprising:
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(a) a tubular mouthpiece member having a lumen extending the length thereof; (b) a fabric screen of a non-woven polyester fiber material having randomly located pores extending therethrough, with the average size of said pores being about 2.225×
10-6 square inches so as to offer a predetermined resistance to fluid flow with the flow being laminar through said lumen, and(c) pressure sensing ports in said mouthpiece member disposed on opposite sides of said screen.
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Specification