Composite Interbody Spacer Segmentation for Spinal Stability
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Solution Overview
Problem
Conventional interbody spacers made of titanium are rigid and provide little cushioning, leading to subsidence and additional pain in the spinal column, as they do not effectively interface with the bearing endplates of vertebrae and can loosen over time due to yielding when bone anchors are inserted.
Innovation Solution
A composite interbody spacer is developed, comprising a first portion made of a less rigid material, such as biocompatible polymers, and a second portion made of a more rigid material, which reinforces the anchor bores and interfaces with bone anchors to prevent yielding and deformation, ensuring stable fixation between vertebrae.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional titanium interbody spacers are used, then structural strength and stability are improved, but cushioning and comfort deteriorate, leading to subsidence and pain
Solution Approach 1:
The interbody spacer is divided into two distinct portions: a first portion made of compliant material (polymer, carbon fiber, or ceramic) that provides cushioning and comfort, and a second portion made of rigid material (metal or composite) that provides structural strength and stability. This segmentation allows each portion to perform its specific function optimally, resolving the contradiction between strength and cushioning.
Solution Approach 2:
Different portions of the interbody spacer are assigned different material properties according to their functional requirements. The first portion uses compliant materials for cushioning where needed, while the second portion uses rigid materials for strength where needed. This local differentiation of material quality allows the device to simultaneously achieve both cushioning and structural integrity.
2Stability of the object's composition
If rigid titanium material is used for the interbody spacer, then stability and load-bearing capacity are improved, but cushioning capability deteriorates
Solution Approach 1:
The spacer is segmented into a first portion for cushioning and a second portion for stability. The first portion uses compliant materials to provide cushioning, while the second portion uses rigid materials to maintain stability and prevent subsidence, thus resolving the contradiction between these two requirements.
Solution Approach 2:
The interbody spacer employs composite construction by combining different materials with complementary properties. The first portion may use polymers, carbon fiber, or ceramics for cushioning, while the second portion uses metals or composites for stability, creating a composite structure that achieves both cushioning and stability simultaneously.
3Reliability
If bone anchors are inserted through the interbody spacer, then fixation reliability is improved, but yielding and deformation of the spacer deteriorates
Solution Approach 1:
The spacer is divided into a first portion that interfaces with bone anchors and a second portion that provides structural support. The first portion is designed with features that securely receive and distribute the load from bone anchors, preventing yielding and deformation while maintaining fixation reliability.
Solution Approach 2:
The first portion of the spacer is specifically designed with local quality enhancements at the bone anchor interface, such as increased thickness, reinforcement structures, or specialized materials, to prevent yielding and deformation under anchor insertion and loading conditions.
Data Source
AI summary
A composite interbody spacer includes a first portion formed of a first material and a second portion formed of a second material.