Anti-Skive Drill Bit Relief Surface for Angled Bone Entry

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Solution Overview

Problem

Drill bits that engage with surfaces at angles other than normal are prone to skiving, which reduces drilling efficiency and effectiveness, particularly when drilling into hard tissues like cortical bone.

Innovation Solution

A drill bit design featuring a distally facing region with a relief surface intersecting the outer diameter and flutes, defined by specific angles and channels, which minimizes skiving by ensuring the most-distal points contact the material before the cutting edges, thus maintaining effective cutting pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a drill bit engages a surface at an angle other than normal, then the drill bit can access angled surfaces, but skiving motion occurs reducing drilling efficiency

Engineering Contradiction:

Improveability to engage angled surfacesVSAvoiddrilling efficiency

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The relief surface is configured to contact the material surface before the cutting edges engage, performing a preliminary action that centers the drill bit and prevents skiving motion before cutting begins, thereby maintaining drilling efficiency while enabling angled surface engagement

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The relief surface acts as an intermediary element between the drill bit body and the material surface, mediating the engagement by first contacting the material to establish proper positioning and force distribution before the cutting edges engage, preventing harmful skiving motion

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the relief surface angle is less than 90 degrees, then skiving is reduced and cutting pressure is maintained, but the relief surface geometry becomes more complex

Engineering Contradiction:

Improvedrilling efficiencyVSAvoidrelief surface geometry

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The relief surface angle is specifically configured to be less than 90 degrees (optimally between 60-80 degrees), changing the geometric parameter to optimize force distribution and prevent skiving, thereby maintaining cutting pressure and drilling efficiency despite increased geometric complexity

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentEP4255324B1Anti-skive drill bit

Publication Date: 2025.09.10 STRYKER EUROPEAN OPERATIONS LIMITED

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AI summary

An anti-skive drill bit including a body having a proximal end, a distal end, a longitudinal axis extending between the proximal and distal ends, and a flute extending longitudinally along the body. The distal end includes a distally facing region and a first channel defining a first channel surface. The distally facing region includes a relief surface having a first most-distal point at one of an intersection of an outer diameter of the body and a leading edge of the first flute, and an intersection of the outer diameter of the body and the first channel surface. The distally facing region has a relief surface angle between the relief surface and an outer diameter surface of the body at the first most-distal point of less than 90 degrees. The channel has a proximal end intersecting the first flute, and a distal end intersecting the relief surface.