Plastic and nonmetallic article shaping or treating: processes – Direct application of electrical or wave energy to work – Polymerizing – cross-linking – or curing
Reexamination Certificate
2003-06-16
2009-02-03
Huson, Monica A (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Direct application of electrical or wave energy to work
Polymerizing, cross-linking, or curing
C264S454000, C264S456000, C264S459000, C264S463000, C264S523000, C264S171280, C264S211000, C264S331190, C604S103060
Reexamination Certificate
active
07485250
ABSTRACT:
A medical device (10) includes a catheter shaft (11) including inner and outer catheter shafts (12and14), and an expandable balloon (18) carried by the catheter shaft (11). The balloon (18) is made from an irradiation cross-linked mixture of a polyamide elastomer and at least one additional cross-linking reactant. The polyamide elastomer can be a polyester amide, a polyether ester amide or a polyether amide, and is preferably a nylon block copolymer. The cross-linking reactant can be: (a) a difunctional material, (b) a trifunctional material, (c) a tetrafunctional material, or (d) an aromatic molecule containing at least two ring substituents, each of the ring substituents having labile hydrogens at a benzylic site therein. The cross-linking reactant can also be diallyl phthalate or meta-phenylene dimaleimide. Irradiation is carried out by exposure to an electron beam or to ultraviolet, X- or gamma radiation, preferably at a total fluence of about 0.5 to about 20 megarads. The amount of the cross-linking reactant is selected to avoid the formation of gelling during the process by which the balloon (18) is made, and the amount of the cross-linking agent and the irradiation fluence are selected to give the balloon a strength generally about equal to that which would be obtained by mere irradiation.
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Boatman Scott E.
Burton David G.
Drewes, Jr. David A.
Hoffa Michael C.
Hupcey Maggie A. Z.
Brinks Hofer Gilson & Lione
Cook Incorporated
Huson Monica A
Wollschlager Jeff
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