Implant needle and method
US4490139A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1983 |
| Grant date | Dec 25, 1984 |
| Priority date | — |
| Expiry date | Jan 28, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M5/3286
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
An improved subcutaneous implant needle is formed as a hollow tube having its forward end cut on a plane at an acute angle to the central axis of the tube to form an elliptical opening, and an elliptical outer edge having a sharp forward portion. The forward extremity of the needle is dressed to form cutting edges intersecting at an obtuse angle and forming a central point. The dressed edges have a width preferably less than two-thirds the diameter of the tube, and the adjoining side portions of the elliptical outer edge are rendered unsharp and dulled, as by abrasion such as sandblasting or tumbling in abrasive media. The needle is dimpled at two locations closely adjacent the rear of the opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.