Adjustable Calcaneal Fixation Device for Dynamic Heel Alignment
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Solution Overview
Problem
Current external fixation devices for calcaneal fractures are subjective and imprecise, making it difficult to consistently fix the calcaneus in the optimal position during the first surgery, and they cannot be adjusted post-operatively, which limits the success of the second surgery and complicate the surgical access during the procedure.
Innovation Solution
An adjustable calcaneal fixation device that allows for dynamic distraction and adjustment in all planes both during and after the first surgery, featuring a removable framework on one side to minimize obstruction during the second surgery, enabling precise positioning and post-operative adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If prior art external fixation devices are used to fix the calcaneus during the first surgery, then the calcaneus can be held in a corrected position, but the fixation is subjective and imprecise making it difficult to consistently locate the calcaneus in the optimal position
Solution Approach 1:
The device incorporates an adjustable framework that can be dynamically repositioned after the first surgery. The framework includes adjustment mechanisms that allow the calcaneus to be repositioned in all planes, transforming a static fixation device into a dynamic one that can adapt to achieve optimal positioning before the second surgery.
Solution Approach 2:
The device allows changing of positional parameters of the calcaneus after the initial fixation. The adjustment mechanism enables modification of the calcaneal pin angle and framework position, allowing precise control over the calcaneus position in multiple planes, thereby achieving consistent and reproducible correction.
2Stability of the object's composition
If the external fixation device framework remains in place during the second surgery, then the calcaneus remains fixed in position, but the framework creates obstacles and complicates surgical access to the heel
Solution Approach 1:
The framework is divided into removable and non-removable portions. The removable portion can be detached before the second surgery to provide clear surgical access to the heel, while the non-removable portion remains to maintain fixation stability. This segmentation allows the surgical team to access the surgical site without compromising the overall fixation structure.
3Productivity
If the calcaneal pin angle is fixed during the first surgery, then the initial correction can be established, but no adjustments can be made post-operatively limiting the success of the second surgery
Solution Approach 1:
The calcaneal pin angle is made dynamic through the adjustable framework. The pin can be repositioned relative to the framework, and the framework itself can be adjusted in all planes, allowing continuous adaptation of the correction angle and position throughout the treatment period between surgeries.
Solution Approach 2:
The device establishes a preliminary correction during the first surgery that can be refined later. The initial fixation provides immediate stability while the adjustment capability allows for fine-tuning of the correction before the second surgery, ensuring optimal positioning is achieved.
Data Source
AI summary
Disclosed is an adjustable and partially removable calcaneal restraint system and treatment method in the context of a first phase of surgery wherein a transverse calcaneal pin is inserted through the calcaneus and the calcaneal restraint system is then installed pending the second surgery. An aspect of the calcaneal restraint system also provides a partially removable framework to allow better or unimpeded access to the desired site for the second surgery stage of the treatment.