The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 11, 1978
Filed:
Jun. 21, 1976
Eldon E Frisch, Midland, MI (US);
Dow Corning Corporation, Midland, MI (US);
Abstract
In accordance with a preferred embodiment of this invention, there is provided a new and improved method of forming a four-lumen gastrointestinal tube. This tube may be characterized as having two lumens which extend nearly the full length of the tube and two lumens which extend through only a portion of the tube. The subject method comprises the steps of: (1) extruding a three-lumen sleeve portion wherein one of the lumens is an insert carrying lumen and the remaining two lumens, in the final gastrointestinal tube assembly, are those lumens which extend the full length of the tube; (2) extruding a two-lumen insert portion, the lumens of which in the final gastrointestinal tube assembly, extend the full length of the assembly, and wherein the external dimensions of the insert portion are slightly larger than the internal dimensions of the insert carrying lumen of the sleeve portion; (3) immersing the sleeve portion in a solvent, preferably chlorothene, to cause it to swell until the internal dimensions of the insert carrying lumen are slightly larger than the external dimensions of the two-lumen insert portion; (4) inserting the insert portion into the insert carrying lumen; and (5) removing the solvent and thereby causing the insert carrying lumen in the sleeve portion to contract around the insert portion forming a 'solvent shrink fit.'