Multiple lumen hose

Abstract

A multiple lumen hose includes a generally circumferential base wall. A plurality of corrugations extend radially outward from the base wall. A septum is disposed interior to the base wall such as to divide the interior of the base wall into at least a first lumen and a second lumen. A first scallop extends outward from the circumferential base wall between adjacent corrugations. A second scallop extends outward from the circumferential base wall between adjacent corrugations.

What is claimed is: 
     
         1 . A method of manufacturing a dual lumen conduit, the method comprising:
 providing at least one mold comprising a plurality of depressions for forming a plurality of corrugations, a plurality of ridges for forming a plurality of uncorrugated regions and a plurality of cavities through the ridges for forming a plurality of scallops in the uncorrugated regions between the corrugations;   placing an extrusion comprising a circumferential base wall and a septum interior to the circumferential base wall in contact with the at least one mold;   providing a differential pressure across the base wall, the pressure within the extrusion being greater than the pressure between the base wall and the mold;   forming a plurality of corrugations in the base wall; and   forming a plurality of scallops in the base wall in the uncorrugated regions, the scallops aligned about the septum.   
     
     
         2 . The method of  claim 1 , further comprising providing at least two molds conjoined about the extrusion, the at least two molds forming circumferential corrugations and opposed scallops in the base wall between the corrugations. 
     
     
         3 . The method of  claim 2 , wherein forming the corrugations stretches the septum out to an inside diameter of the corrugations. 
     
     
         4 . The method of  claim 2 , wherein forming the scallops stretches the septum out to an inside diameter of the scallops. 
     
     
         5 . The method of  claim 2 , wherein the scallops reduce a localized distance stretched by the corrugations, resulting in improved structural integrity of the corrugations. 
     
     
         6 . The claim of  claim 2 , wherein the septum is dimensioned to extend between generally opposed scallops. 
     
     
         7 . The method of  claim 6 , wherein the dimension of the septum reduces stretching of the septum required to extend out to the inside diameter of the corrugations. 
     
     
         8 . The method of  claim 7 , wherein the reduced stretching results in a smoother septum and a dual lumen conduit with reduced airflow resistance. 
     
     
         9 . A dual lumen breathing circuit tube, comprising:
 a generally circumferential base wall defining a conduit, the base wall extending between a first end cuff and a second end cuff;   a plurality of corrugations extending radially outward from the base wall;   a plurality of first scallops extend outward from the circumferential base wall between adjacent corrugations;   a plurality of second scallops extend outward from the circumferential base wall between adjacent corrugations, each second scallop of the plurality opposite a first scallop; and,   a septum disposed interior of the base wall, scallops, and the corrugations, the septum being secured to the corrugations, first scallops, and second scallops, and the septum divides the conduit into a first lumen and a second lumen.   
     
     
         10 . The dual lumen breathing circuit tube of  claim 9 , wherein:
 the generally circumferential base wall comprises a first diameter and the plurality of corrugations extend radially outward from the base wall to a second diameter; and   wherein a corresponding pair of a first scallop of the plurality of first scallops and a second scallop of the plurality of second scallops define a third diameter and the third diameter is greater than the first diameter and less than the second diameter.   
     
     
         11 . The dual lumen breathing circuit tube of  claim 9 , wherein the plurality of first scallops and the plurality of second scallops reduce a distance that the septum and the corrugations are stretched. 
     
     
         12 . The dual lumen breathing circuit tube of  claim 9 , wherein a conduit is formed by vacuum molding an extrusion comprising the circumferential base wall and the septum. 
     
     
         13 . The dual lumen breathing circuit tube of  claim 12 , wherein the vacuum molding forms the plurality of first scallops and the plurality of second scallops and the corrugations by stretching the base wall and the septum. 
     
     
         14 . The dual lumen breathing circuit tube of  claim 9 , wherein the septum is dimensioned to extend between the opposed first and second scallops. 
     
     
         15 . The dual lumen breathing circuit tube of  claim 9 , wherein the plurality of first scallops and the plurality of second scallops reduce the stretching of the corrugations at an intersection or with the septum. 
     
     
         16 . The dual lumen breathing circuit tube of  claim 15 , wherein the stretched septum is of a generally constant thickness. 
     
     
         17 . A method of manufacturing a dual lumen conduit, the method comprising:
 providing at least two molds comprising a plurality of depressions for forming a plurality of corrugations, a plurality of ridges for forming a plurality of uncorrugated regions and a plurality of cavities through the ridges for forming a plurality of scallops in the uncorrugated regions between the corrugations;   placing an extrusion comprising a circumferential base wall and a septum interior to the circumferential base wall in contact with the at least two molds such that the at least two molds are conjoined about the extrusion;   providing a differential pressure across the base wall, the pressure within the extrusion being greater than the pressure between the base wall and the mold;   forming a plurality of corrugations in the base wall; and   forming a plurality of scallops in the base wall in the uncorrugated regions, the scallops aligned about the septum.   
     
     
         18 . The method of  claim 17 , wherein forming the corrugations stretches the septum out to an inside diameter of the corrugations, and wherein forming the scallops stretches the septum out to an inside diameter of the scallops. 
     
     
         19 . The method of  claim 17 , wherein the septum is dimensioned to extend between generally opposed scallops. 
     
     
         20 . The method of  claim 17 , wherein the dimension of the septum reduces stretching of the septum required to extend out to the inside diameter of the corrugations, and wherein the reduced stretching results in a smoother septum and a dual lumen conduit with reduced airflow resistance.