Disposable bacteria filter
First Claim
Patent Images
1. A respiratory filter comprising:
- a housing;
a removable mouthpiece;
a means for a leakproof coupling between said housing and said removable mouthpiece;
means for filtration mounted between said housing and said removable mouthpiece; and
said means for filtration further comprising an airflow resistance of 0.9 cm H2 O/liter/second or less at 12 liters per second flow.
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Accused Products
Abstract
An interchangeable set of wide orifice respiratory filter elements can be built into either a low resistance, high dead space embodiment for forced vital capacity testing or high resistance, low dead space embodiment for diffusion and residual air tests. A disposable 3M Filtrete™ pad is at the heart of all embodiments thus allowing extremely high levels of filtration efficiencies.
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Citations
15 Claims
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1. A respiratory filter comprising:
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a housing; a removable mouthpiece; a means for a leakproof coupling between said housing and said removable mouthpiece; means for filtration mounted between said housing and said removable mouthpiece; and said means for filtration further comprising an airflow resistance of 0.9 cm H2 O/liter/second or less at 12 liters per second flow. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A respiratory filter apparatus comprising:
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a reusable housing; a mouthpiece; a disposable filter pad mounted between said housing and said mouthpiece; means for coupling and sealing said reusable housing and said mouthpiece in a leakproof manner, wherein said assembly comprising said reusable housing, said mouthpiece, and said disposable filter pad further comprises an airflow resistance of approximately 0.9 cm H2 O/liter/second or less at 12 liters per second flow; an interchangeable second filled reusable housing; an interchangeable second filled mouthpiece, wherein said assembly comprising said interchangeable second filled reusable housing, said interchangeable second filled mouthpiece, and said disposable filter pad further comprises a total dead space of approximately 90 cc'"'"'s.
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13. An improvement on the disposable filter apparatus on a spirometer;
- the improvement comprising;
a housing; a mouthpiece; a disposable filter pad mounted between said housing and said mouthpiece; means for coupling and sealing said housing and said mouthpiece in a leakproof manner, wherein said assembly comprising said housing, said mouthpiece, and said disposable filter pad and said spirometer further comprises an airflow resistance of less than 1.5 cm H2 O/liter/second at 12 liters per second flow; an interchangeable second filled housing; an interchangeable second filled mouthpiece, wherein said assembly comprising, said interchangeable second filled housing, said interchangeable second filled mouthpiece, and said disposable filter and said spirometer further comprises a total dead space less than 150 cc'"'"'s. - View Dependent Claims (14, 15)
- the improvement comprising;
Specification