Liquid absorbing filter assembly and system using same
First Claim
1. A filter assembly for use in a sidestream gas sampling assembly comprising:
- a housing having an inlet, an outlet, and an inner wall defining a channel through the housing from the inlet to the outlet;
a hydrophobic member disposed across the channel at a location proximate to the outlet; and
a hydrophilic liner disposed on the inner wall.
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Accused Products
Abstract
A filter assembly for use in sidestream gas sampling assembly. The filter assembly of the present invention includes a hydrophilic liner lining the inner perimeter of a housing for wicking moisture from the gases to be monitored prior to the gases reaching a sensing mechanism. The filter further includes a hydrophobic member positioned downstream of the hydrophilic liner. The hydrophobic disk acts as a second line of defense against moisture reaching the sensing mechanism. In one embodiment, the filter further include an absorbent layer positioned between the cylindrical housing and the hydrophilic layer to aid in wicking moisture from the gas stream. In a further embodiment, the hydrophobic disk is eliminated and the hydrophilic member is situated such that gas entering the filter assembly must pass through at least a portion the hydrophilic member.
71 Citations
22 Claims
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1. A filter assembly for use in a sidestream gas sampling assembly comprising:
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a housing having an inlet, an outlet, and an inner wall defining a channel through the housing from the inlet to the outlet;
a hydrophobic member disposed across the channel at a location proximate to the outlet; and
a hydrophilic liner disposed on the inner wall. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 18, 19)
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12. A sidestream gas monitoring system comprising:
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(a) a sampling line having a first end and a second end, wherein the sampling line is adapted to carry a flow of gas from a patient circuit;
(b) a filter assembly comprising;
(1) a housing having an inlet adapted to be coupled to the second end of the sampling line, an outlet, and an inner wall defining a channel through the housing from the inlet to the outlet, (2) a hydrophobic member disposed across the channel at a location proximate to the outlet, and (3) a hydrophilic liner disposed on the inner wall;
(c) a sample cell operatively coupled to an outlet of the housing; and
(d) a detecting system adapted to measure a constituent of gas contained within the sample cell. - View Dependent Claims (13, 14, 15, 16, 17)
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20. A filter assembly for use in a sidestream gas sampling assembly comprising:
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a housing having an inlet, an outlet, and an inner wall defining a channel through the housing from the inlet to the outlet;
hydrophilic member having a first end portion and a second end portion, wherein the hydrophilic member is disposed in the housing such that gas entering the housing impacts the first end portion and such that gas passing through the channel must pass through at least a portion of the hydrophilic member, and wherein the first end portion includes a recess defined therein. - View Dependent Claims (21, 22)
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Specification