Method for chemical etching of a needle cannula
US9822455B2 · kind B2 · utility
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11References
10Claims
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Key dates
| Filing date | Sep 20, 2010 |
| Grant date | Nov 21, 2017 |
| Priority date | — |
| Expiry date | Jan 10, 2031 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2207/00
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.