Novo Nordisk A/S
METHOD OF PRODUCING NEEDLE CANNULA WITH REDUCED END PORTION BY ELECTROCHEMICAL ETCHING

Abstract:

A needle cannula 100 and a method for producing a needle cannula comprising providing a needle cannula tube 10 with an end portion 30. The end portion 30 includes an outer surface, and a given type of steel comprising carbon (C) in 0.07 to 0.15% by mass, silicon (Si) in 0.50 to 1.00% by mass, manganese (Mn) in 5.0 to 7.5% by mass, phosphorus (P) in 0 to 0.030 by mass, sulfur (S) in less than or equal to 0.015% by mass, chromium (Cr) in 17.5 to 19.5% by mass, nickel (Ni) in 6.5 to 8.5% by mass, and nitrogen (N) in 0.20 to 0.30% by mass. The method further includes establishing an electrochemical reaction to remove material from the outer surface of the end portion 30, and thereby providing a needle cannula 100 with a tapered end portion.