Dynamic Compression Fixation for Bone Alignment and Remodeling
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Solution Overview
Problem
Existing bone fracture treatments often result in improper healing due to bone misalignment during the healing process, leading to issues such as delayed union, malunion, and nonunion, which can cause loss of function, chronic pain, and increased medical costs.
Innovation Solution
Implantable devices with a dynamic compression portion that can transform between axially compact and elongated configurations, providing controllable, dynamic compression to stabilize broken bones and accommodate micromovements, using materials like Nitinol or titanium alloys with helical slits to match the elastic properties of bone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If static compression fixation devices are used to stabilize broken bones, then bone stability is improved, but the device cannot accommodate micromovements and bone remodeling during healing, leading to improper healing
Solution Approach 1:
The fixation device incorporates a dynamic compression portion made of shape memory material that can transform between axially compact and elongated configurations. This dynamic structure allows the device to adapt to bone healing stages: providing compression during initial healing, then allowing micromovements and remodeling as the bone strengthens, thereby resolving the contradiction between stability and adaptability
Solution Approach 2:
The device utilizes shape memory material that changes its physical parameters (axial length, compression force) in response to temperature or stress changes. This parameter transformation enables the device to maintain appropriate compression during healing while accommodating subsequent bone remodeling, addressing both stability and adaptability requirements
2Manufacturing precision
If rigid fixation is applied to stabilize bone fractures, then alignment is improved initially, but the device cannot accommodate bone remodeling and micromovements during healing
Solution Approach 1:
The dynamic compression portion transitions from a rigid state during initial fixation to a more flexible state as healing progresses. This time-dependent change in rigidity allows the device to maintain alignment precision during early stages while accommodating remodeling in later stages, resolving the contradiction between alignment precision and duration of rigid fixation
Solution Approach 2:
The device provides continuous compression force throughout the healing process through shape memory material transformation. This continuous action maintains bone alignment while gradually adapting to remodeling, eliminating the need to choose between initial alignment precision and long-term adaptability
3Productivity
If compression is applied to promote bone healing, then healing rate is improved, but the device cannot maintain appropriate compression over time as bone remodels
Solution Approach 1:
The shape memory material dynamically adjusts compression parameters based on temperature or stress changes that occur during bone healing. This enables the device to maintain appropriate compression force throughout the healing process, resolving the contradiction between initial healing rate and long-term compression duration
Solution Approach 2:
The device incorporates feedback mechanisms through shape memory material that responds to changes in the bone healing environment. This feedback loop allows the compression force to be automatically adjusted to match the healing stage, maintaining optimal compression duration without compromising the healing rate
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
Enhances bone healing by maintaining appropriate compression over time, allowing for proper alignment and remodeling, reducing the risk of improper healing and improving patient outcomes.
Implementation Method 1
the dynamic compression portion can include a material configured to transform between the first, axially compact configuration and the second, axially elongated configuration
Implementation Method 2
The cannulated rod can include a rod wall and a helical slit through the rod wall
Data Source
AI summary
Devices and methods are disclosed for orthopedic uses, such as treating and compressing a broken bone. An implantable device may be provided with an elongate body, a head region, a bone engagement part such as an anchor region or threads, a dynamic compression portion in either a first axially compact configuration or a second axially elongated configuration and configured to transform between the first axially compact configuration and the second axially elongated configuration, and a sleeve slidably located over the dynamic compression portion and configured to inhibit the dynamic compression portion from expanding radially outward.