Expandable Orthopedic Fastener for Monocortical Bone Plate Fixation
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Solution Overview
Problem
Current bone fracture repair methods require bi-cortical drilling, which is invasive and may not provide sufficient grip for fixation, especially when using photodynamic bone stabilization systems.
Innovation Solution
A monocortical orthopedic locking system with expandable fasteners that utilize an outer and internal member configuration, allowing for fixation without bi-cortical drilling, where the outer member expands to engage with the bone and internal fixation implant, enhancing grip and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If bi-cortical drilling is used for bone fixation, then grip strength is improved, but tissue damage and surgical complexity increase
Solution Approach 1:
The fastener is divided into two functional sections: a first outer section that engages with the bone cortex and a second outer section that engages with the internal fixation implant. This segmentation allows each section to be optimized for its specific engagement target, achieving secure fixation without requiring bi-cortical drilling through the entire bone.
Solution Approach 2:
The fastener transitions from a simple linear pin to a multi-dimensional structure with differentiated outer sections. The first outer section has geometry optimized for cortical bone engagement while the second outer section is configured for implant engagement, adding dimensional complexity to the fastener design itself rather than requiring complex surgical drilling patterns.
2Stability of the object's composition
If bi-cortical drilling is used for bone fixation, then fixation stability is improved, but surgical procedure complexity increases
Solution Approach 1:
The fastener is divided into two functional sections: a first outer section that engages with the bone cortex and a second outer section that engages with the internal fixation implant. This segmentation allows each section to be optimized for its specific engagement target, achieving secure fixation without requiring bi-cortical drilling through the entire bone.
Solution Approach 2:
Different portions of the fastener are given different geometric qualities: the first outer section has features optimized for cortical bone engagement (such as tapered geometry or surface characteristics), while the second outer section has features optimized for implant engagement. This local differentiation of qualities allows each interface to be optimized independently.
3Ease of manufacture
If standard depth drill holes are used, then manufacturing simplicity is improved, but fixation reliability may be compromised
Solution Approach 1:
The single fastener design serves multiple functions: the first outer section provides cortical bone engagement while the second outer section provides implant engagement. This multi-functionality allows a single standardized fastener to achieve reliable fixation without requiring customized drill hole depths or configurations for different bone densities or implant types.
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 provides effective fixation and stabilization of weakened or fractured bones by maximizing fastener holding power without the need for bi-cortical drilling, using a standard depth for drill holes and minimizing tissue damage.
Implementation Method 1
activating a visible light source to cure the monomer and form a cured internal bone fixation implant
Implementation Method 2
applying a force to the effector tool to longitudinally move the internal member with respect to the outer member to cause the second outer section of the outer member to expand
Data Source
AI summary
Systems and methods for bone fixation are disclosed herein. According to aspects illustrated herein, there is provided a fastener for use in securing a bone plate that includes an outer member having a first outer section and a second outer section, wherein formed in the first outer section is a first bore with a first shape and formed in the second outer section is a second bore with a second shape; and an internal member longitudinally moveable within the outer member, the internal member having a first internal section having an outer surface that is sufficiently designed to fit within and engage a wall of the second bore of the outer member and a second internal section sufficiently sized to fit within the first bore of the outer member, the second internal section having an outer end with a peripheral engagement portion.