| 摘要 |
A catheter reinforced to prevent luminal collapse and tensile failure thereof, comprising an elongated tubular member having a proximal end, a distal end and a longitudinal extent, the elongated tubular member defining at least one lumen therethrough for enabling fluid flow between the proximal end and at least one opening defined in at least one of the distal end and the elongated tubular member proximal to the distal end thereof; the elongated tubular member including an outer tubular cover and at least one helical reinforcing member for reinforcing the outer tubular cover to prevent radial collapse of the outer tubular cover during bending and pinching of the elongated tubular member and to prevent longitudinal breakage of the outer tubular cover under tension, the at least one helical reinforcing member having an unwound length and a wound length, said at least one helical reinforcing member being wound arround the longitudinal axis of said elongated tubular member with a length ratio LR less than one (1) plus the approximate ultimate strain of said outer tubular cover where LR equals the unwound length of said at least one helical reinforcing member relative to said wound length of said at least one helical reinforcing member.
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