Medical device with collapse-resistant liner and method of making same
A medical device for guiding through anatomy, such as a catheter or guidewire, with a tubular body that has been slotted to enhance bending flexibility, and a polymer liner with an anti-collapsing structure, and a method of making a medical device with a kink-resistant corrugated tubular member and an anti-collapsing structure. Anti collapsing structures may be helical or annular, and may be wire, such as ribbon wire, grooves in the liner, corrugations, or a braid. Liners may be bonded to the anti-collapsing structure, or may have two layers, with the anti-collapsing structure between the layers. Corrugations may be formed between sections of the anti-collapsing ‘structure with heat, pressure, stretching, compression, a mold, or a combination thereof, and may extend inward or outward. Shape or wall thickness may vary along the length to provide a varying bending stiffness. Slots may be formed in groups of two, three, or more, and adjacent groups may be rotated about the axis forming a helical pattern.
1. A medical device, comprising:
an elongate tubular member having a plurality of slots formed therein;
a liner disposed within the tubular member, the liner having an outer surface and a plurality of corrugations formed along the outer surface, wherein at least some of the plurality of corrugations are disposed at longitudinal positions along the medical device substantially corresponding to longitudinal positions of at least some of the plurality of slots; and
a coil disposed along the outer surface of the liner.
2. The medical device of claim 1 , wherein the corrugations include outward corrugations.
3. The medical device of claim 1 , wherein the corrugations include inward corrugations.
4. The medical device of claim 3 , further comprising a second coil disposed in the inward corrugations.
5. The medical device of claim 1 , wherein the coil is a ribbon coil.
6. The medical device of claim 1 , further comprising a polymeric member disposed over the coil and the liner.
7. The medical device of claim 1 , wherein the tubular member has a longitudinal axis, wherein at least some of the plurality of slots are arranged in groups that are disposed at the same location along the longitudinal axis of the tubular member, and wherein at least some of the groups include three slots.
8. The medical device of claim 7 , wherein the groups of slots include a first group at a first position along the longitudinal axis of the tubular member and a second group adjacent the first group at a second position along the longitudinal axis of the tubular member, and wherein the second group is rotated relative to the first group.
9. The medical device of claim 8 , wherein the second group is rotated by an angle greater than 50 degrees and less than 70 degrees relative to the first group.
10. The medical device of claim 9 , wherein the second group is rotated by an angle of about 55 degrees relative to the first group.
11. A medical device, comprising:
an elongate tubular member having a plurality of slots formed therein;
a liner disposed within the tubular member, the liner having an outer surface and a plurality of inward corrugations formed along the outer surface, wherein at least some of the plurality of inward corrugations are disposed at longitudinal positions along the medical device substantially corresponding to longitudinal positions of at least some of the plurality of slots; and
an anti-collapsing structure disposed along the outer surface of the liner.
12. The medical device of claim 11 , wherein the anti-collapsing structure includes a coil.
13. The medical device of claim 12 , wherein the coil is a ribbon coil.
14. The medical device of claim 11 , further comprising a coil disposed in the inward corrugations.
15. The medical device of claim 14 , further comprising a polymeric member disposed over the coil and the anti-collapsing structure.