Bone drilling cannula
US8469963B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 2008 |
| Grant date | Jun 25, 2013 |
| Priority date | — |
| Expiry date | Jul 9, 2030 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/17
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A drilling guide cannula, having a serrated distal end in the form of axially moveable teeth which enables all or most of the teeth to maintain biting contact with the bone surface, essentially independently of the curvature of the bone surface and the drilling angle. The cannula outer wall incorporates a number of pins arranged circumferentially around the drilling bore. These pins slide axially relative to the cannula, preferably in bored holes or in channels formed within the wall of the cannula. Each of the secondary pins has a sharpened distal end, each constituting a moveable tooth. The cannula is applied to the bone to be drilled at the desired drilling position and angle, and the pins are forced axially towards the bone surface. The pins take up the contour of the bone surface and each pin bites into the bone surface to rigidly position the drilling guide cannula.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.