Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Plural sequential shaping or molding steps on same workpiece
Patent
1996-04-24
1998-02-17
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Plural sequential shaping or molding steps on same workpiece
264294, 264344, 264347, 6048911, 604265, B29C 3502
Patent
active
057188629
ABSTRACT:
A method for preparing a medical device having the steps: (1) treating an ionically crosslinked hydrogel to strip a substantial amount of the ionic crosslinks while retaining the hydrogel in a desired shape; and (2) ionically re-crosslinking the treated hydrogel of step (1) while retaining the hydrogel in the desired shape. In an exemplary embodiment, a ureteral stent is made by mounting a length of extruded calcium or barium alginate tubing onto a shaping jig and performing secondary shaping to form coil-shaped ends by soaking the mounted robing in a stirred potassium chloride bath, and then soaking it in a calcium chloride bath. The ends readily return after elastic deformation to their coil shapes, with the stent having a permanent memory imposed by the secondary shaping.
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Hercules Incorporated
Sloan Martin F.
Thurlow Jeffery R.
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