Bone Graft Cage With Interstitial Mesh For Containment
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Solution Overview
Problem
Current methods for treating large bone defects with bone grafts often face challenges in maintaining the graft material in place, leading to potential displacement and ineffective healing due to the lack of a suitable containment mechanism.
Innovation Solution
A mesh-based containment device comprising an outer sleeve and an inner sleeve connected via struts, with an interstitial mesh extending radially to hold graft material in place between separated bone portions, customizable to match specific bone dimensions using 3D imaging and printing technology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple mesh container is used to contain bone graft material, then the device complexity is reduced, but the graft material may still migrate or fall away from the target site before incorporation
Solution Approach 1:
The patent employs a nested structure with an inner sleeve containing interstitial mesh, which is itself contained within an outer sleeve. This multi-layer nested configuration provides progressive containment security, where each layer reinforces the others to prevent graft material migration while maintaining overall structural integrity and avoiding excessive complexity.
Solution Approach 2:
The containment device is segmented into distinct functional components: an inner sleeve for structural support, interstitial mesh for graft material retention, and an outer sleeve for additional containment and stability. This segmentation allows each component to perform its specific function optimally while working together as an integrated system.
2Reliability
If a mesh container is designed to match the outer surface of the bone, then the graft material is contained effectively, but the device cannot be easily inserted or adjusted in the target area
Solution Approach 1:
The outer sleeve incorporates a longitudinal slot that allows the sleeve to dynamically open and conform to the bone's outer surface contours during insertion. This dynamic flexibility enables easy positioning and adaptation to varying bone geometries, while the sleeve maintains its containment function once properly positioned.
Solution Approach 2:
The device utilizes parameter changes in the form of the longitudinal slot configuration, which allows the structural parameters of the outer sleeve to change from a closed rigid state during storage to an open flexible state during insertion, and then to a conforming stable state when positioned on the bone surface.
3Reliability
If PMMA spacers are used to form a capsule for bone graft material, then the graft material can be contained, but the spacers must be removed before final grafting, adding procedural complexity
Solution Approach 1:
The mesh-based containment device is designed to remain in place permanently as part of the final grafting structure, eliminating the need for removal and reinsertion of containment elements. The device serves itself by providing continuous containment support throughout the healing process, thereby simplifying the overall treatment procedure.
Solution Approach 2:
The containment device is pre-configured with the interstitial mesh and sleeve structure before implantation, allowing graft material to be loaded directly into the prepared containment space in a single surgical step, eliminating the need for preliminary spacer placement and subsequent removal.
4Reliability
If the mesh container is made rigid to maintain shape, then the graft material is held securely, but the device cannot adapt to different bone profiles and dimensions
Solution Approach 1:
The device applies local quality by making only the outer sleeve flexible with the longitudinal slot, while the inner sleeve and interstitial mesh maintain their structural rigidity for secure graft containment. This localized flexibility allows adaptation to different bone profiles without compromising the overall containment reliability.
Data Source
AI summary
A device for containing bone graft material includes a mesh outer sleeve extending longitudinally from a proximal end to a distal end and sized and shaped to correspond to a profile of an outer surface of a target bone. The outer sleeve includes a longitudinal slot extending along a length thereof. The device also includes a mesh inner sleeve connected to an interior surface of the outer sleeve via at least one strut so that a bone graft collecting space is defined therebetween. The inner sleeve is sized and shaped to correspond to a profile of a medullary canal of the target bone. In addition, the device includes an interstitial mesh extending radially away from an exterior surface of the inner sleeve toward an interior surface of the outer sleeve to hold graft material in the bone graft collecting space.