Importance

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Abstract

A generally cylindrical member, such as a catheter, cannulae, or the like, has a monolithic construction. An inner core of plastic is passed through a conventional reinforcing apparatus, such as a conventional braiding mechanism. The braiding action is interrupted at predetermined intervals while the core continues to be fed so that straight reinforcing strand lengths are disposed on the outer surface of the inner core at predetermined lengths. The member passes through a heated sizing die to adhere the braided strand to the inner core, and a mechanical shear or rotating blade cuts the straight strand lengths off so that they are detached from the core. An over-extrusion of plastic may be provided to encapsulate the reinforcing strands. When the catheter is free of reinforcing strands it is relatively soft and flexible--such as at its tip--and where the reinforcing strands are provided it is relatively stiff. The monolithic construction ensures that components will not detach in a patient's body.

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First Claim