Catheter construction
Polymeric tubing, for use with catheters or other medical devices, where the polymeric tubing can have regions of customized properties including, but not limited to, durometer, torque control, flexibility, axial strength, stiffness, etc. One variation of the device allows for transitions between regions to be configured such that there can be gradual or customized transitions between various regions such that the structural characteristics differential between the regions are selectively designed. Additional variations include outer layers having a plurality of material sections extending in a spiral direction along the axial length to form a continuous wall of the outer layer. In certain variations, the structural characteristic differential is minimized or eliminated as compared to conventional catheters.
1. A medical tubing comprising:
a plurality of polymer sections forming a composite layer, the plurality of polymer sections extending spirally along an axial length of the composite layer, where each polymer section of the plurality of polymer sections is located next to at least one adjacent polymer section;
wherein each polymer section of the plurality of polymer sections comprises a structural property respectively and where the structural property of at least two polymer sections is different;
wherein a first axial region of the composite layer comprises a first sequence of polymer sections including at least a first polymer and a second polymer, and wherein a second axial region of the composite layer comprises a second sequence of polymer sections including at least the first polymer and a third polymer, such that the first sequence of polymer sections is different than the second sequence of polymer sections causing a structural property of the first axial region to be different than a structural property of the second axial region.
2. The medical tubing of claim 1 , further comprising an inner liner interior to the composite layer and a reinforcement structure exterior to the inner liner and within the composite layer.
3. The medical tubing of claim 1 , wherein at least one of the plurality of polymer sections extends over more than a half of an axial length of the composite layer.
4. The medical tubing of claim 1 , wherein a height of one of the plurality of polymer sections differs from a height of the second polymer in the composite layer.
5. The medical tubing of claim 1 , wherein in the first axial region, the first polymer and the second polymer both extend in a spiral direction, the first polymer comprises a first structural property and the second polymer comprises a second structural property, where the first structural property differs from the second structural property.
6. The medical tubing of claim 5 , the composite layer further comprising a transition region where a width of the first polymer increases while a width of the second polymer decreases causing a structural property of the transition region to vary along the transition region.
7. The medical tubing of claim 5 , wherein a width of the first polymer is greater than a width of the second polymer in at least the first axial region.
8. The medical tubing of claim 5 , where an end of the second polymer decreases in a taper.
9. The medical tubing of claim 5 , wherein the spiral direction of the first polymer and the second polymer comprises a right-hand wind.
10. The medical tubing of claim 5 , wherein the spiral direction of the first polymer and the second polymer comprises a left-hand wind.
11. The medical tubing of claim 5 , wherein the third polymer extends over a majority of the axial length of the composite layer.
12. The medical tubing of claim 1 , wherein the composite layer includes a proximal lengthwise region proximal to the first axial region and proximal to the second axial region, where the proximal lengthwise region is entirely formed from a single polymer section.
13. The medical tubing of claim 1 , wherein a durometer of the first polymer is greater than a durometer of the second polymer.
14. The medical tubing of claim 13 , wherein the durometer of the first polymer is greater than a durometer of the third polymer.
15. The medical tubing of claim 14 , wherein the durometer of the second polymer is greater than the durometer of the third polymer.