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US 11,492,723 B2Granted
Electrolyte solutions for electropolishing of nitinol needles
AssigneeCilag GmbH International
InventorDuan Li Ou
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Abstract
A low-hazardous electropolishing process has been developed to remove oxide layer(s) from the surface of nitinol needles. Low concentrations of citric acid and sulfamic acid are mixed with medium concentrations of sulfuric acid to use as an electrolyte solution. The process can be easily fitted into current suture needle manufacturing processes as well as into processes require electropolishing of nitinol-containing medical devices.
Claims20
An electropolishing device comprising a bath for the containment of an electropolishing solution comprising a non-alcoholic aqueous solution comprising:
- a) 25 to 50 weight % sulfuric acid,
- b) 0.5 to 10 weight % citric acid, and
- c) 0.2 to 2 weight % sulfamic acid;
- and a medical device having a nickel-titanium surface with an oxide layer and connection to a source of electric current for electropolishing.
1 more element
Dependencies are inferred from the claim text.