Angulated Locking Plate Double Helix Screw
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current bone fracture repair methods face challenges in securely affixing fixation plates to bones, particularly when screws need to be inserted at angles other than perpendicular due to weak bone areas near fracture lines, as existing technologies do not effectively allow for angled locking without compromising stability or increasing insertion time.
Innovation Solution
A locking fixation plate system with threaded screw holes featuring a double helix configuration and a screw with a conical head and cylindrical shaft, allowing for angled insertion and locking, which reduces the number of turns required for engagement and accommodates both locking and non-locking screws, facilitating faster plate installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a locking screw is inserted at an angle other than perpendicular to anchor into solid bone, then the anchoring strength is improved, but the insertion time and number of turns required increases
Solution Approach 1:
The patent applies parameter changes by modifying the thread configuration from a standard single helix to a double helix arrangement. This fundamental parameter change in the threading geometry enables the screw to achieve the same axial penetration and locking engagement in half the number of rotations, directly reducing insertion time while maintaining the ability to insert at angled trajectories for optimal anchoring strength in weak bone areas
2Productivity
If a double helix thread configuration is used, then the number of turns for engagement is reduced, but the manufacturing complexity increases
Solution Approach 1:
The patent employs mechanics substitution by replacing complex multi-step threading processes with a streamlined double helix thread formation method. This substitution simplifies the manufacturing system by using specialized but straightforward threading tools that can cut or form both helical paths simultaneously or sequentially, reducing the overall manufacturing complexity despite the advanced thread geometry required for high-speed engagement
3Ease of manufacture
If traditional single helix threads are used, then the manufacturing process is simpler, but the insertion time is longer
Solution Approach 1:
The patent resolves this contradiction through parameter changes in the thread geometry, transitioning from a single helix to a double helix configuration. This parameter modification increases engagement speed by enabling faster axial advancement per rotation, while the manufacturing process remains feasible through adapted threading tools and methods that can efficiently create the double helix pattern without prohibitively increasing complexity
Data Source
AI summary
An improved fixation plate using at least a double helix screw as disclosed. The double helix screw may include alternate embodiments comprising three, four, or more threads. The helix thread screw intertwines with double helix thread in the screw hole of the fixation plate providing enhanced fixation to a fractured bone.