Orthopedic Plate Selectable Fixation Mechanism
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Solution Overview
Problem
Current orthopedic locking plate systems are overly stiff, leading to higher non-union rates and construct failure, while variable angle locking designs compromise strength, and existing solutions require modifications to both plates and surgical procedures.
Innovation Solution
A system that allows for selectable fixation modes, including fixed angle locking, variable angle locking, and non-locking, within a single fastener opening, using a locking ring and drill guide, and a variable angle non-locking fastener with a rounded head, allowing for flexible angle adjustment without altering existing plates or surgical procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If locking fixation plates are used to provide mechanical stability, then fixation strength is improved, but construct stiffness increases leading to higher non-union rates and construct failure
Solution Approach 1:
The patent applies the dynamics principle by enabling the fixation system to transition between different fixation modes (locked and non-locked states) after implantation. The dynamic locking mechanism allows the construct to adapt its stiffness characteristics based on healing progression, providing initial rigid stability for fracture reduction while permitting controlled micromotion during the healing phase to stimulate bone union, thereby resolving the contradiction between fixation strength and construct failure rate
Solution Approach 2:
The patent implements parameter changes by modifying the mechanical properties of the fixation construct through the dynamic locking mechanism. The system can change from a rigid locked state with high stiffness to a more compliant non-locked state with reduced stiffness, allowing optimization of mechanical parameters (stiffness, flexibility) to match different stages of bone healing and reduce construct failure while maintaining adequate fixation strength
2Adaptability or versatility
If variable angle locking designs are used to increase flexibility, then adaptability is improved, but fixation strength is compromised
Solution Approach 1:
The patent resolves this contradiction by implementing a dynamic locking mechanism that maintains full fixation strength in the locked state regardless of angle variation. The dynamic lock allows the fastener to be inserted at variable angles relative to the plate while still achieving rigid fixation when locked, providing both angular flexibility and maximum fixation strength simultaneously through the ability to transition between locked and non-locked states
3Reliability
If traditional locking plate systems are used to ensure mechanical stability, then fixation reliability is improved, but surgical procedure complexity increases due to required modifications
Solution Approach 1:
The patent applies universality by designing a dynamic locking mechanism that can be integrated into existing standard orthopedic plate and fastener systems. The mechanism maintains compatibility with conventional plates and fasteners while adding the multi-functionality of both locked and non-locked fixation modes, allowing surgeons to use the same hardware for both fixation types without requiring separate specialized components or modifying existing surgical procedures
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
The system enhances the strength of variable angle locking, reduces construct failure, and improves fracture union rates, while maintaining compatibility with existing surgical practices and inventory, providing a more flexible and effective fixation option.
Implementation Method 1
the deformable surface of the locking insert to accept the head of the fastener at any angle
Data Source
AI summary
An orthopedic plate and fastener system is provided for fixation of bones which has an implant that can selectably be used to achieve fixed angle and variable locking of the fasteners, as well as non-locking of the fasteners. The system includes a variable locking assembly that includes a locking insert, having threads which mates with internal threads of a through opening in the implant. The system also provides for locking fixed angle fixation, and non-locking variable angle fixation, all of which can be used with the threaded holes of the plates. The locking insert is provided on a ring driver, which is similar to or acts as the drill guide used with the locking fasteners of the present. Thus, the invention also relates to a method of enabling surgery where the surgeon can select the mode of fixation of fasteners between variable axis locking, variable axis non-locking, and fixed angle locking fixation, all utilizing the same fastener opening within the implant.