Self-Countersinking Orthopedic Screw Neck Design
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Solution Overview
Problem
Current orthopedic screws require separate tools and additional steps to achieve desired positioning flush with the bone or bone plate surface, lacking efficient self-countersinking features.
Innovation Solution
The orthopedic screws feature a neck portion with dual adjacent cutting flutes and a material removal channel that transitions from a larger head diameter to a smaller shaft diameter, allowing for self-countersinking during installation, eliminating the need for additional instruments and steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate tools and additional steps are used to position screws flush with the bone surface, then positioning precision is improved, but device complexity and installation time increase
Solution Approach 1:
The patent combines the screw driver cavity and countersink function into a single integrated structure. The head portion includes a driver recess that simultaneously serves as the driving interface and the countersink cavity, eliminating the need for separate countersinking tools and steps while achieving flush positioning of the screw with the bone surface
Solution Approach 2:
The driver recess in the head portion performs multiple functions: it serves as the interface for the screw driver during installation, acts as the countersink cavity to receive the screw head, and provides the tapered geometry needed for self-countersinking. This multi-functional design eliminates the need for additional specialized tools
2Manufacturing precision
If separate countersinking tools are used, then countersinking precision is improved, but installation time and productivity decrease
Solution Approach 1:
The countersink cavity is pre-formed as an integral part of the screw head structure during manufacturing. This preliminary action eliminates the need for post-manufacturing countersinking operations, allowing the screw to be installed directly into the bone without additional time-consuming steps while maintaining precise positioning
Solution Approach 2:
The installation process merges the driving and countersinking operations into a single action. As the screw is driven into the bone using the integrated driver recess, the head automatically countersinks into the pre-formed cavity, achieving both functions simultaneously and improving installation productivity
3Measurement precision
If additional instruments are used for positioning, then positioning accuracy is improved, but the number of components and device complexity increase
Solution Approach 1:
The patent merges the positioning function into the screw structure itself through the integrated driver recess and head geometry. The tapered neck portion and driver cavity work together to automatically position the screw head flush with the bone surface, eliminating the need for separate positioning instruments or additional components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables screws to be countersunk into bones or bone plates without extra tools, providing secure engagement and increased cantilever strength, while allowing for thinner bone plates and deeper driver cavity engagement.
Implementation Method 1
a neck portion defining a taper extending between the first outer diameter and the second outer diameter and having an outer surface that defines first and second cutting flutes that cooperatively define a cutting surface
Data Source
AI summary
An orthopedic screw has a head portion defining a proximal end and defining a proximal thread extending around the longitudinal axis and having a first outer diameter, a tip portion defining a cutting edge and a distal end, a body extending between the proximal end and the distal end along the longitudinal axis and defining a shaft having a second outer diameter that is less than the first outer diameter, and a neck portion defining a taper extending between the first outer diameter and the second outer diameter and having an outer surface that defines first and second cutting flutes that cooperatively define a cutting surface, a cutting relief, and a material removal channel that is continuous with the proximal thread. The proximal end defines a proximal opening to the cavity. Methods of installing an orthopedic screw are also described.