Cranioplasty Attachment Coil Structure for Dynamic Bone Flap Decompression
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Solution Overview
Problem
Existing cranioplasty solutions, such as telescopic or spring-based systems, often provide insufficient decompression and are aesthetically unappealing, leaving patients at risk of injury and requiring extended hospitalization due to unpredictable bone flap geometries and complications like sinking flap syndrome.
Innovation Solution
A cranioplasty prosthesis with attachment devices featuring a coil and frame structure that allows out-of-plane deformation, enabling dynamic adjustment to accommodate intracranial pressure changes while preventing inward movement of the bone flap, using a biocompatible material like titanium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If telescopic or spring-based dynamic systems are used to allow bone flap movement and expand intracranial volume, then decompressive craniotomy capability is improved, but the systems become voluminous and create aesthetic issues with lumps on the head
Solution Approach 1:
The attachment device is divided into distinct functional segments: a rigid frame portion for structural support and anchoring, and a flexible coil portion for deformation and volume expansion. This segmentation allows each part to perform its specific function efficiently while maintaining overall system compactness.
Solution Approach 2:
The coil portion is designed to be flexible and deformable, allowing it to dynamically adjust its shape and volume in response to intracranial pressure changes. This dynamic behavior enables the system to provide decompressive craniotomy capability without requiring a large fixed volume.
2Adaptability or versatility
If telescopic or spring-based dynamic systems are used to allow bone flap movement, then decompressive craniotomy capability is improved, but the systems exhibit unnecessary resistance to bone flap or prosthesis movement, providing insufficient decompression
Solution Approach 1:
The coil portion acts as a flexible element that can deform easily under applied forces. This flexibility minimizes resistance to bone flap or prosthesis movement, allowing for smooth and unrestricted motion while still providing the necessary structural support through the rigid frame portion.
3Reliability
If custom-made cranial prostheses are used in cranioplasty, then the skull opening is covered, but the geometrical parameters of the bone flap are difficult to predict prior to surgery, resulting in extended periods with uncovered skull
Solution Approach 1:
The attachment device is designed with universal applicability, featuring a standardized structure that can accommodate various bone flap geometries. The flexible coil portion adapts to different shapes and sizes, eliminating the need for custom-made prostheses and reducing preoperative planning complexity.
Solution Approach 2:
The attachment device is designed and prepared in advance with predetermined geometrical parameters that can accommodate most craniectomy openings. This preliminary preparation eliminates the need for extended waiting periods for custom prosthesis fabrication, allowing for timely cranioplasty coverage.
4Adaptability or versatility
If the coil portion is made flexible to enable out-of-plane deformation, then decompression capability is improved, but the structural strength may be compromised
Solution Approach 1:
The attachment device is divided into a rigid frame portion and a flexible coil portion. The rigid frame provides necessary structural strength and anchoring, while the flexible coil provides decompression capability through out-of-plane deformation. This segmentation allows each part to optimize its properties without compromising the other.
Solution Approach 2:
The attachment device combines materials with different mechanical properties: rigid materials for the frame portion to ensure structural strength, and flexible materials for the coil portion to enable deformation. This composite construction allows the system to simultaneously achieve both strength and flexibility requirements.
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 solution provides effective decompression, reduces the risk of complications, and minimizes hospitalization time by allowing for a single surgical intervention to address intracranial pressure issues and protect the brain.
Implementation Method 1
the coil portion having struts configured for deforming in flexion
Implementation Method 2
webs between the struts configured for deforming in torsion
Data Source
AI summary
An attachment device for cranioplasty may have a body defined from a sheet material and may include a first connection end having at least a first connection hole configured to cooperate with a fastener to anchor the attachment device to a bone flap or prosthesis covering at least part of the opening in the skull. A second connection end has at least a second connection hole configured to cooperate with a fastener to anchor the attachment device to a skull adjacent to an opening in the skull. A frame portion extends from the first connection end. A coil portion may be between the frame portion and the second connection end, the coil portion having struts configured for deforming in flexion, and webs between the struts configured for deforming in torsion. The frame portion is configured to be located over a periphery of the opening in the skull to block inward movement. The coil portion enables an out-of-plane deformation of the attachment device for the first connection end to move out of a neutral plane with the second connection end.