Thermal gradient beveling of catheters

Details Thermal gradient beveling of catheters Thermal gradient beveling of catheters

1996-12-13

2000-04-11

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264323, 264327, 425384, 425393, B29C 4338

Patent

active

060484853

ABSTRACT:
A process for forming a catheter tip is described wherein a mold having an internal surface complimentary to the desired external surface of the catheter tip is formed such that it has two temperature zones. A first higher temperature zone is positioned proximally of the catheter distal tip and a lower temperature zone is positioned distal to the higher temperature zone. A catheter to be tipped is placed upon a mandrel or needle and the mold is heated. Upon insertion of the catheter and mandrel into the mold. The catheter material softens and begins to flow within the mold. The higher temperature portion supplies the heat necessary to soften the catheter material and it flow to the lower temperature zone wherein the lower temperature causes the catheter material to become more viscous or resolidify. Upon becoming more viscous, the catheter material, at the very tip, acts as a dam to prevent further flow of material thus eliminating flash from the mold end.

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