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US 2014/0234164 A1Published application
Post electron beam stabilization of polymeric medical devices
AssigneeAbbott Cardiovascular Systems Inc.
InventorsLothar Kleiner, Fuh-Wei Tang
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Abstract
Methods are disclosed for chemically stabilizing a polymer stent after sterilization. The stent is exposed to a temperature above ambient for a period of time after radiation sterilization. The exposure reduces the concentration of free radicals generated by the radiation.
Claims6
A method of stabilizing a stent comprising:
- sterilizing a stent made of polymer with radiation, wherein the radiation exposure generates free radicals within the polymer;
- exposing the stent to a temperature cycle including increasing the exposure temperature to a specified temperature above ambient and decreasing the exposure temperature to a minimum temperature;
- and
- repeating the temperature cycle one or more times, wherein the repeated cycles reduce the concentration of free radicals and increase the decay kinetics of free radicals leading to their disappearance and thereby reducing the chemical degradation of the polymer due to the sterilization.
1 more element
Dependencies are inferred from the claim text.