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Multi-lumen catheter having a monolithic elongate tubular shaft member having a proximal end, a distal end and a longitudinal length therebetween. The tubular shaft member has an outer cross-sectional dimension that varies along the length of the tubular shaft member. The tubular shaft member has an

Multi-lumen catheter having a monolithic elongate tubular shaft member having a proximal end, a distal end and a longitudinal length therebetween. The tubular shaft member has an outer cross-sectional dimension that varies along the length of the tubular shaft member. The tubular shaft member has an inner core made of a first material and an outer layer made of a second material. The inner core has a first lumen and a second lumen defined therein, the first lumen having a first lumen cross-section and a length extending at least along a portion of the length of the tubular shaft member. The first lumen cross-section is substantially uniform along the length of the first lumen. The second lumen has a second lumen cross-section and a length extending along the length of tubular shaft member. The second lumen cross-section is substantially uniform along the length of the second lumen.

대표청구항 ▼

1. A multi-lumen catheter comprising: a monolithic elongate tubular shaft member having a proximal end, a distal end and a longitudinal length therebetween, the tubular shaft member having an outer cross-sectional dimension that varies along the length of the tubular shaft member,the tubular shaft m

1. A multi-lumen catheter comprising: a monolithic elongate tubular shaft member having a proximal end, a distal end and a longitudinal length therebetween, the tubular shaft member having an outer cross-sectional dimension that varies along the length of the tubular shaft member,the tubular shaft member having an inner core made of a first material and an outer layer made of a second material, the inner core having a first lumen and a second lumen defined therein, wherein the first lumen is disposed adjacent to the second lumen,the first lumen having a first lumen cross-sectional dimension and a length extending at least along a portion of the length of the tubular shaft member, the first lumen cross-sectional dimension being substantially uniform along the length of the first lumen, andthe second lumen having a second lumen cross-sectional dimension and a length extending along the length of tubular shaft member, the second lumen cross-sectional dimension being substantially uniform along the length of the second lumen. 2. The catheter according to claim 1, wherein the outer cross-sectional dimension decreases distally along at least a portion of the tubular shaft member. 3. The catheter according to claim 1, wherein the outer cross-sectional dimension changes uniformly along at least a portion of the tubular shaft member. 4. The catheter according to claim 1, wherein the inner core has an outer cross-sectional dimension that varies along the length of the tubular shaft member. 5. The catheter according to claim 1, wherein the first lumen has a substantially circular cross-section configured to receive a guidewire therethrough. 6. The catheter according to claim 1, wherein the length of the first lumen extends the length of the tubular shaft member, the first lumen having a distal port at the distal end of the tubular shaft member and a proximal port at the proximal end of the tubular shaft member. 7. The catheter according to claim 1, further comprising a liner along at least a portion of the length of the first lumen. 8. The catheter according to claim 1, wherein the inner core and the outer layer are coextruded. 9. The catheter according to claim 1, wherein the first material is different from the second material. 10. The catheter according to claim 1, wherein the first material comprises at least one of Nylon, Nylon 12, Nylon TR55, transparent amorphous nylon, PEBAX, and high density polyethylene. 11. The catheter according to claim 1, wherein the second material comprises at least one of Pebax 63D, Pebax 70D, and Pebax 72D. 12. The catheter according to claim 1, wherein the outer cross-sectional dimension of the inner core decreases distally along the tubular shaft member and the outer layer includes an outer cross-sectional dimension that decreases distally along the tubular shaft member. 13. The catheter according to claim 1, wherein the first lumen has a distal port at the distal end of the tubular shaft member and a proximal port defined through an external surface of the tubular shaft member and spaced distally from the proximal end of the tubular shaft member. 14. The catheter according to claim 13, wherein the proximal port is defined by a notch extending through the outer layer and into the inner core to intersect the first lumen. 15. The catheter according to claim 1, wherein the tubular shaft member has a proximal section, an intermediate section, and a distal section, and further wherein the outer cross-sectional dimension varies along at least one of the proximal section, the intermediate section and the distal section. 16. The catheter according to claim 15, wherein the outer cross-sectional dimension is substantially uniform along at least one of the proximal section, the inter mediate section and distal section. 17. The catheter according to claim 16, wherein the outer cross-sectional dimension is uniform in the proximal section and in the distal section, and the outer cross-sectional dimension tapers in the intermediate section. 18. The catheter according to claim 1, further comprising a balloon member coupled to the tubular shaft member proximate the distal end thereof, the second lumen having a distal flow port in fluid communication with an interior chamber of the balloon. 19. The catheter according to claim 18, further comprising a distal flow port in fluid communication with the second lumen and disposed within the interior of the balloon. 20. The catheter according to claim 19, wherein the distal flow port is spaced proximally from the distal end of the tubular member, the distal flow port defined by a notch extending through the outer layer and into the inner core to intersect the second lumen. 21. The catheter according to claim 1, further comprising an intermediate layer between the inner core and the outer layer. 22. The catheter according to claim 21, wherein the intermediate layer is a tie layer to join the outer layer to the inner core. 23. The catheter according to claim 22, wherein the intermediate layer comprises at least one of Primacor, PET, Polyester Elastomer, and high density polyethylene. 24. The catheter according to claim 1, wherein the second lumen has at least one of a substantially semicircular cross-section or a substantially circular cross-section. 25. The catheter according to claim 24, wherein the second lumen comprises a plurality of individual inflation lumens. 26. The catheter according to claim 24, wherein the second lumen comprises the substantially semicircular cross-section and the substantially semi-circular cross-section of the second lumen has a straight edge portion proximate the first lumen. 27. The catheter according to claim 26, wherein the second lumen includes a proximal flow port proximate the proximal end of the tubular shaft member, the proximal flow port in fluid communication with the second lumen to receive a pressurized fluid therein. 28. The catheter according to claim 27, further comprising an adaptor coupled to the tubular member, the adaptor having a fluid branch fluidly coupled with the proximal flow port. 29. A method of forming a multi-lumen catheter comprising: extruding a first material to form an inner core with a first lumen and a second lumen defined therein, wherein the first lumen is disposed adjacent to the second lumen, the first lumen having a first lumen cross-sectional dimension and the second lumen having a second lumen cross-sectional dimension;extruding a second material generally surrounding the inner core to form an extrudate having an outer layer of the second material surrounding the inner core of the first material, the extrudate having an outer cross-sectional dimension;drawing a length of the extrudate at a varied speed to vary the outer cross-sectional dimension along the length thereof; and internally pressurizing the first lumen and the second lumen, respectively, while drawing the extrudate to maintain the first lumen cross-sectional dimension and the second lumen cross-sectional dimension; andcooling the extrudate to form a monolithic elongate tubular shaft member having a proximal end, a distal end and a longitudinal length therebetween, the tubular shaft member having an outer cross-sectional dimension that varies along the length of the tubular shaft member. 30. The method of forming a multi-layer catheter according to claim 29, wherein internally pressurizing the first lumen and the second lumen is adjusted proportionally to draw the length of the extrudate at a varied speed. 31. The method of forming a multi-layer catheter according to claim 29, wherein internally pressurizing the first lumen and the second lumen is increased when drawing the length of the extrudate is increased. 32. The method of forming a multi-layer catheter according to claim 29, wherein extruding the first material and the extruding the second material is performed at least one of simultaneously or sequentially.