Medical tubing having variable characteristics and method of making same
The invention primarily is directed to a medical tubing adapted for insertion into a body tissue or cavity and method of manufacturing different variations of the tubing along a length of the tubing. The tubing comprises a plurality of individual, discrete, generally ring-shaped elements arranged in series and fused or bonded together forming a continuous tubular structure. The ring-shaped elements may include a combination of flexible and rigid ring-shaped elements assembled along different portions or sections of the tubular structure. In another aspect of the invention, the medical tubing may further comprise a secondary lumen and a pull wire to control the tubular structure. In another aspect of the invention, the ring-shaped elements may vary in diameter and/or composition in different portions or sections of the tubular structure.
1. A method of manufacturing a multi-lumen tube, comprising:
coating a first wire with a plastic material;
winding the coated first wire around a first mandrel, thereby forming a plurality of windings in a first wound coated wire;
coating a second wire with a plastic material;
winding the coated second wire around a second mandrel, thereby forming a plurality of windings in a second wound coated wire;
placing a compression sleeve over the second wound coated wire and the first wound coated wire to compress the second wound coated wire against the first wound coated wire prior to heating; and
heating the second wound coated wire and the first wound coated wire in the compression sleeve until the plastic material fuses the windings such that a second wire-reinforced tube is formed next to a first wire-reinforced tube as the multi-lumen tube.
2. The method of claim 1 , further comprising removing the compression sleeve after heating the second wound coated wire along with the first wound coated wire.
3. The method of claim 1 wherein the wire-reinforced tube has a lumen and a diameter size different than a lumen and diameter size of the second wire-reinforced tube.
4. The method of claim 1 , wherein the plastic material comprises at least one of polyurethane, a thermoplastic or a thermoset.
5. The method of claim 1 , wherein at least one of the wires comprises at least one of a metallic material or a second plastic material.
6. The method of claim 1 , wherein at least one of the wires is coated with the plastic material in a coextrusion process.
7. The method of claim 1 , wherein at least one of the first wire-reinforced tube or the second wire-reinforced tube has a wall thickness of approximately 0.015 inches or less.
8. The method of claim 1 , wherein at least one of the first wire-reinforced tube or the second wire-reinforced tube has an inner diameter that ranges from approximately 0.026 inches to approximately 0.75 inches.
9. The method of claim 8 , wherein the tolerance on the inner diameter is on the order of approximately 0.001 inches or less.
10. The method of claim 1 , wherein the heating is effected until the plastic material is formed above, below and between all the windings.
11. The method of claim 10 further comprising dipping the multi-lumen tube in a solvent-based solution forming an outer layer on the multi-lumen tube.