Pneumotachometer
First Claim
1. A differential pressure pneumotachometer comprising:
- a housing having an inlet and an outlet;
a resistive element disposed between said inlet and outlet to divide said housing into an inlet chamber and an outlet chamber and to generate a pressure difference between said inlet chamber and said outlet chamber as air flows between said inlet chamber and said outlet chamber; and
a pressure port disposed in said outlet chamber in isolated gaseous communication with said inlet chamber, wherein the pressure in said inlet chamber is sensed through said pressure port.
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Accused Products
Abstract
A disposable differential pressure pneumotachometer includes an inlet chamber having an air inlet, an outlet chamber having an air outlet, and a resistive element disposed between the inlet and outlet chambers. Air flow across the resistive element results in a pressure gradient which is measured to provide air flow rate. According to one aspect of the invention, the pressure port through which the static pressure in the inlet chamber is sensed is disposed in the outlet chamber. According to a further aspect of the invention, the resistive element comprises a bacterial filter material. Also described is a pneumotachometer in which at least one pressure port is covered with a bacterial filter material.
53 Citations
20 Claims
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1. A differential pressure pneumotachometer comprising:
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a housing having an inlet and an outlet;
a resistive element disposed between said inlet and outlet to divide said housing into an inlet chamber and an outlet chamber and to generate a pressure difference between said inlet chamber and said outlet chamber as air flows between said inlet chamber and said outlet chamber; and
a pressure port disposed in said outlet chamber in isolated gaseous communication with said inlet chamber, wherein the pressure in said inlet chamber is sensed through said pressure port. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for sensing respiratory air flow comprising the steps of:
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directing a flow of air through a housing having an inlet, an outlet and a resistive element disposed between said inlet and said outlet to separate said housing into an inlet chamber and an outlet chamber; and
sampling the pressure in said inlet chamber through a pressure port disposed in said outlet chamber. - View Dependent Claims (10, 11, 12, 13)
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14. A differential pressure pneumotachometer comprising:
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a housing having an inlet and an outlet;
a resistive element disposed between said inlet and outlet to divide said housing into an inlet chamber and an outlet chamber and to generate a pressure difference between said inlet chamber and said outlet chamber as air flows between said inlet chamber and said outlet chamber; and
a pressure port through which the pressure in said inlet chamber is sensed; and
a bacterial filter material disposed over said pressure port. - View Dependent Claims (15, 16, 17)
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18. A differential pressure pneumotachometer comprising:
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a housing having an inlet and an outlet;
a bacterial filter material disposed between said inlet and outlet to divide said housing into an inlet chamber and an outlet chamber and to generate a pressure difference between said inlet chamber and said outlet chamber as air flows between said inlet chamber and said outlet chamber; and
a pressure port through which the pressure in said inlet chamber is sensed, wherein said pressure port is disposed in said outlet chamber in isolated gaseous communication with said inlet chamber. - View Dependent Claims (19, 20)
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Specification