Cranial Implant Assembly with Magnetic Locking for Swelling Adaptation
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Solution Overview
Problem
Current cranial implant technologies are rigid and designed for delayed cranioplasty procedures, failing to adapt to initial brain swelling and movement, necessitating a second surgical stage for normalization and protection of the skull opening.
Innovation Solution
A non-rigid cranial implant assembly that can be introduced during craniectomy, transitioning to a rigid state as the brain and dura normalize, providing a single-operation solution by using an articulated spanning member, peripheral attachment member, and magnetic locking mechanism to secure the implant in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid cranial implant is used for delayed cranioplasty, then the skull opening is protected, but the implant cannot adapt to initial brain swelling and movement
Solution Approach 1:
The cranial implant transitions from a flexible state during brain swelling to a rigid state after normalization. The implant comprises a cover with multiple flexible segments that can articulate relative to each other, allowing adaptation to brain volume changes while providing protection. As the brain swells, the segments articulate to accommodate the increased volume; as the brain normalizes, the segments stabilize to provide rigid protection.
Solution Approach 2:
The implant's physical state changes from flexible to rigid over time. The material properties and structural configuration are designed to evolve: initially flexible to accommodate swelling, then transitioning to a rigid protective state. This parameter change allows the implant to serve both adaptive and protective functions sequentially.
2Reliability
If traditional two-stage procedure (craniectomy followed by delayed cranioplasty) is performed, then protection is provided, but the patient faces infection risk and requires multiple surgeries
Solution Approach 1:
The invention combines craniectomy and cranioplasty into a single surgical stage. The implant is designed to be inserted during the initial craniectomy procedure itself, eliminating the need for a separate delayed cranioplasty surgery. This merging of procedures reduces the number of surgical interventions, lowers infection risk, and provides immediate protection.
Solution Approach 2:
The implant is prepared and inserted during the initial craniectomy procedure, performing the protective function beforehand rather than waiting for a delayed procedure. The implant is positioned and secured during the same surgical intervention, providing immediate protection while the brain undergoes normalization.
3Adaptability or versatility
If a non-rigid implant is used immediately after craniectomy, then adaptation to brain swelling is achieved, but the implant must transition to rigid state for protection
Solution Approach 1:
The implant is designed with dynamic characteristics that allow it to be flexible initially and become rigid over time. The cover segments are connected in an articulated manner, permitting movement and adaptation during brain swelling, while the overall structure is designed to stabilize and provide rigid protection as the brain normalizes.
Solution Approach 2:
The implant undergoes a parameter change from flexible to rigid state. The material selection and structural design enable this transition: the implant is sufficiently flexible to accommodate brain volume changes but has inherent properties or mechanisms that allow it to become rigid for protection as needed.
4Strength
If delayed cranioplasty is performed, then the implant provides protection, but the period of exposure increases infection risk
Solution Approach 1:
The protective implant is inserted during the initial craniectomy procedure, providing immediate protection rather than waiting for a delayed cranioplasty. This preliminary action eliminates the period of exposed skull opening, thereby reducing the window of opportunity for infection.
Solution Approach 2:
The protective function is merged into the initial craniectomy procedure. By combining the decompression and protection functions into a single surgical event, the implant provides immediate coverage, eliminating the vulnerable period between craniectomy and delayed cranioplasty.
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 simultaneous craniectomy and cranioplasty, reducing the risk of infection and post-surgical complications by adapting to brain swelling and providing immediate protection without the need for a second surgical procedure.
Implementation Method 1
magnetic locking mechanism to secure the implant in place
Data Source
AI summary
Embodiments relate to systems and methods for a cranial implant assembly adapted for insertion during a craniectomy procedure. In aspects, the inventive cranial implant assembly can contain a peripheral attachment member for attachment to the edge of a skull opening, as well as an articulated spanning member that over-arches and holds a cover in place over the opening. The articulated spanning member contains a central implant fastened or connected to a swollen dura in the skull opening. As swelling of the dura subsides, tension is exerted on guidewires in both the spanning member and cover to draw those constructs into a rigid state. The tips of the spanning member can gradually approach the peripheral attachment member, and register into place using a locking mechanism, such as a pair of opposing magnets. As a result, only one surgical operation or procedure Is required to both perform a craniectomy and implant a supporting assembly for eventual skull regeneration.