Surgical drill collet mechanism and bur
US5222956A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 6, 1992 |
| Grant date | Jun 29, 1993 |
| Priority date | — |
| Expiry date | Jul 6, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T279/17752
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A surgical drill uses burs with circular grooves about the circumference that are polygon shaped in cross section but curved along the length of the bur so as to accept locking balls therein. The burs slide within a tubular drive shaft that has transverse holes therein to guide the locking balls. A cylindrical cam surrounds the drive shaft and the locking balls to urge the balls radially inward into the bur groove. The cam is spring loaded axially. A spring loaded central pin within the drive shaft slides between the balls and urges the balls radially outward when no bur is inserted. A thumb button is used to disengage the ball surrounding cam.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.