| 摘要 |
A sheath and a method for making said sheath are provided. The sheath includes with an inner liner defining a passageway about a longitudinal axis extending longitudinally therethrough. A coil is fitted around at least a part of the inner liner. The coil has a series of windings that are locatable at a continuously smaller distance from the longitudinal axis to form a taper in a distal direction. The tube further includes an outer layer positioned longitudinally over the coil that is adapted to adhere to the inner liner. The coil may be spirally wound such that the windings are disposed at a continuously smaller distance from the longitudinal axis in a longitudinal direction. The sheath can have a tapered passageway or a passageway with a uniform diameter. The sheath preferably has a continuous taper along its outer surface from the proximal end to the distal end.
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