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US 6,779,522 B2Granted
Method and apparatus for treating breathing gases
AssigneePerma Pure LLC
InventorsT. Paul Smith, David A. Leighty, Charles E. Dubois, Erik M. Anhorn
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Abstract
A method of making thin-walled permeable tubing using air blown extrusion, and of using the tubing in a device which enables a substantial humidification or drying of patient breathing gases in the breathing lines for patient monitoring or anesthesia results in cost savings and increased efficiency.
Claims6
The method of manufacturing thin-walled permeable membrane tubing comprising the steps of:
- inserting water permeable material into a blown film extruder;
- forcing said material through concentric extruding heads in said extruder;
- blowing air through the center of said extruding head to create a thin-walled tube in the form of a flat band, converting said thin-walled tube to the hydrogen ion form;
- drying said converted flat band;
- bathing said flat band in methanol to swell said flat band;
- and manipulating said swelled band into a tubular shape.
3 more elements
Dependencies are inferred from the claim text.