Dynamic Orthopedic Fixator with Deformable Span for Controlled Bone Motion
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Solution Overview
Problem
Current orthopedic fixators require manual intervention for initial distraction and adjustment, which can be cumbersome and may not allow for controlled, gentle movement of joints during the healing process, potentially leading to stiffness and inadequate alignment of bone fragments.
Innovation Solution
A dynamic external fixator with a first and second attaching apparatus connected to bone units and a control apparatus using a reformably deformable member to apply distraction, compression, or controlled rotation, allowing for automatic adjustment and relative motion of the bone units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual intervention is used for initial distraction and adjustment of fixators, then the alignment of bone fragments can be achieved, but the process becomes cumbersome and may lead to joint stiffness
Solution Approach 1:
The fixator system is designed to automatically adjust and maintain bone fragment alignment through self-regulating mechanical components. The compression/distraction mechanism and articulating elements automatically respond to bone healing stages without requiring manual intervention, allowing the device to serve itself in maintaining proper alignment while eliminating cumbersome manual adjustments that could cause joint stiffness
2Manufacturing precision
If manual adjustment is required to alter the degree of distraction, then control over bone positioning is achieved, but the complexity of operation increases and time is lost
Solution Approach 1:
The fixator incorporates dynamic compression/distraction mechanisms that can automatically adjust bone positioning based on healing progression. The articulating elements and reformably deformable members enable the device to transition between different states (compression, distraction, neutral) without manual intervention, maintaining precise control over bone positioning while eliminating time-consuming adjustment procedures
3Reliability
If springs are secured to pins using polymer/monomer, then the distraction mechanism is stabilized, but the device complexity and potential for complications increase
Solution Approach 1:
The patent eliminates the polymer/monomer securing mechanism entirely by extracting this complex chemical bonding system from the device. Instead, the springs are secured through simple mechanical means or direct attachment to the pins, reducing device complexity and potential complications while maintaining the stability of the distraction mechanism through purely mechanical connections
4Force
If initial distraction requires manual separation of bones, then the distraction can be established, but the procedure becomes more invasive and time-consuming
Solution Approach 1:
The fixator is pre-configured with compression/distraction mechanisms and articulating elements that automatically provide the necessary distraction force without requiring manual separation of bones. The device is prepared in advance to self-initiate distraction upon installation, eliminating the need for invasive manual bone separation procedures while establishing the required distraction force
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 efficient and controlled distraction, compression, or rotation of bone units, promoting proper alignment and healing while reducing manual intervention, thus minimizing the risk of joint stiffness and improving treatment outcomes.
Implementation Method 1
The control apparatus is operatively associated with the first attaching apparatus and with the second attaching apparatus to move the second bone unit in a first direction relative to the first bone unit for one of distraction and compression
Implementation Method 2
The control apparatus can also provide for control of relative rotation of the joint
Data Source
AI summary
An orthopedic apparatus is provided for bridging a first bone unit to a second bone unit. The apparatus is demonstrated on a finger joint, wherein one of the bones and/or ligaments and/or tendons of the joint is/are injured. A method for implanting and using the apparatus also is presented. The apparatus includes a reformably deformable span portion which is generally circular and preferably rhombic. By deforming or reforming the span portion, it can be repositioned laterally, and/or it can be rotated to allow range of rotary motion so as to promote healing.