Method for chemical etching of a needle cannula

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United States of America Patent

PATENT NO 9822455
APP PUB NO 20120271249A1
SERIAL NO

13497472

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Abstract

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A regular metallic, cylindrical tubular needle cannula (1) is subjected to a metal etching liquid (21) in the inside lumen (4) thereby increasing the inside diameter and enhancing the flow properties while maintaining the outside appearance. The inside diameter is only increased over a controlled length (7) of the full length of the needle cannula (1) leaving sufficient length and wall thickness to also taper the outside diameter.

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Patent Owner(s)

  • NOVO NORDISK A/S

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Andersen, Mikael Malmo, DK 12 59
Christoffersen, Lasse Wengel Frederikssund, DK 7 212
Larsen, Andre Dragoer, DK 34 1642
Preuthun, Jan Harald Broenshoej, DK 17 1860

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