Patent · US Expired

Cranial perforator with reentrant cutting segment

US4884571A · kind A · utility

26Cited by
17References
9Claims
0Family size

Assignee

Inventor

Key dates

Filing dateSep 30, 1985
Grant dateDec 5, 1989
Priority date—
Expiry dateSep 30, 2005

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10T408/9065
  • 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 leading inner drill has at least one drilling flute with a forward cutting edge including a reentrant cutting segment axially rearward from the outer end of the forward cutting edge and extending inwardly towards the longitudinal axis of the perforator.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.