Soft-tipped catheters

Details Soft-tipped catheters Soft-tipped catheters

1990-05-11

1992-06-30

Rosenbaum, C. Fred

Surgery

Means for introducing or removing material from body for...

Treating material introduced into or removed from body...

604 93, 156159, 15624418, 138140, A61M 500

Patent

active

051259133

ABSTRACT:
A double-layer medical catheter with an integral soft tip is made by the coextrusion of a relatively rigid inner layer and a relatively soft outer layer, where the extrusion equipment is configured and so controlled to interrupt the supply of the material for the inner layer to form a periodic void in the inner wall. The act of interrupting the supply causes a ramp down in the inner wall thickness at the leading edge of each void and the ramp up of the thickness at the trailing edge. The void is cut to produce two ideal integral soft-tipped catheters.

REFERENCES:
patent: 4627844 (1986-12-01), Schmitt
patent: 4755171 (1988-07-01), Tennant
patent: 4790831 (1988-12-01), Skribiski
patent: 4863442 (1989-09-01), DeMello et al.
patent: 4886506 (1989-12-01), Lovgren et al.
patent: 4898591 (1990-02-01), Jang et al.
patent: 4950257 (1990-08-01), Hibbs et al.
patent: 4994047 (1991-02-01), Walker et al.

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