Cranial perforator
US4803982A · kind A · utility
Inventor
Key dates
| Filing date | Mar 26, 1987 |
| Grant date | Feb 14, 1989 |
| Priority date | — |
| Expiry date | Mar 26, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T408/70
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A new drill-type cranial perforator is disclosed of the type which comprises a front drill head assembly made up of a leading inner drill and a trailing outer drill, and a rear support and drive assembly adapted to enable both drills so long as the leading inner drill is encountering a resistive surface and to disable both drills when the leading inner drill stops encountering the resistive surface. The inner drill is coupled to the outer drill and to the rear support and drive assembly by a plurality of lugs, each of the lugs having a cam surface, and the outer drill includes a plurality of drive surfaces which coact with the cam surfaces. The new perforator is characterized by cam surfaces which are beveled outwardly toward an outer surface of the inner drill member in a helical twist, with the degree of bevel increasing progressively along the length of the cam surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.