Patent ID: 7674421

Claim:
A method of forming a guide catheter shaft, comprising: forming an inner tube structure; forming a multilayer sheath around the inner tube structure, the multilayer sheath including an intermediate sheath and a shrink tube layer, said intermediate sheath around the inner tube structure, the intermediate sheath comprising a melt-processible first polyether-block amide material, said shrink tube layer around the intermediate sheath, and said shrink tube layer comprising a second polyether-block amide material that has a shrink temperature range greater than a melt temperature range of said first polyether-block amide material; and heating the resulting structure at a temperature within the shrink temperature range of the shrink tube layer, thereby causing the second polyether-block amide material to shrink and the first polyether-block amide material to melt, and bonding the multilayer sheath to the inner tube structure.