Bone Defect Cap with Positioning Rim for Precise Fit
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Solution Overview
Problem
Existing solutions for covering and reconstructing bone defect sites often require precise fitting and can affect healthy bone tissue, with challenges in positioning and support, and may require additional surgeries for removal of materials.
Innovation Solution
A device comprising a cap with a dimensionally stable, biocompatible material that can be structured in multiple layers, featuring a rim with a positioning means for precise fit and fixation within the bone defect site, allowing for complete coverage without affecting adjacent healthy bone, and potentially using biodegradable or resorbable materials for controlled resorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a covering membrane is used to close off the recess, then bone reconstruction material can be filled and osseous growth can occur from the bone side, but the covering membrane lacks support function and requires attachment nails that damage healthy bone
Solution Approach 1:
The device is divided into two functional parts: a cap that provides structural support and closes the defect, and a membrane that provides biological coverage. The cap bears the mechanical load while the membrane provides biological function, separating the support function from the covering function to avoid damaging healthy bone with attachment nails.
Solution Approach 2:
The device combines a rigid or semi-rigid cap material (such as PEEK, titanium, or ceramic) with a biological membrane material. This composite structure provides both mechanical support to prevent membrane collapse and biological coverage to protect the reconstruction material, eliminating the need for damaging attachment nails.
2Manufacturing precision
If a precision-fit covering device is used, then the device fits well at the bone defect site, but positioning at the bone defect site becomes more difficult
Solution Approach 1:
The cap is pre-formed with precise dimensions and geometry that match the specific bone defect site, determined through pre-operative planning and imaging. This preliminary precision manufacturing allows the cap to be easily positioned and fixed without requiring complex intraoperative adjustments, resolving the contradiction between precise fit and ease of positioning.
3Strength
If non-resorbable membrane material is used, then support function is provided, but a second surgery is required to remove exogenous material after bone healing
Solution Approach 1:
The cap material is selected to have appropriate mechanical strength properties that provide sufficient support during the bone healing period, then gradually degrade over time as bone regenerates. This parameter change from strong to degradable allows the cap to provide temporary support without requiring removal surgery, as it naturally resorbs after serving its purpose.
Data Source
AI summary
A device for covering and/or reconstructing a bone defect site includes a cap (molded shell, rigid shell, molded body) having a rim and at least one fixing device for fixing the cap on a bone. The cap has a dimensionally stable (rigid) nature. A wall of the cap facing the bone defect or a wall of the cap facing away from the bone defect corresponds to the shape of the regenerated bone, at least one positioning device being located on the rim of the cap. A method produces a cap for a covering device for a bone defect site.