Hybrid Radiolucent Screw with Segmented Radiopaque Components
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional medical screws made of metal alloys cause distortion in X-ray images, making it difficult for surgeons to assess proper placement and fracture healing, and often break due to low torque properties, leading to increased surgical time, trauma, and costs.
Innovation Solution
A hybrid radiolucent screw with radiopaque components and a radiolucent body, designed to minimize distortion in imaging and enhance visualization, featuring a tip and head with radiopaque materials for improved torque and visibility, and a radiolucent body for reduced stress shielding and easier implantation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional metal alloy implants are used, then strength and torque resistance are improved, but radiographic visualization and imaging clarity deteriorate due to distortion and obscuration
Solution Approach 1:
The screw is divided into multiple segments with different material properties: radiopaque components (tip, head, or selected portions) and radiolucent components (body). This segmentation allows different regions to serve different functions - radiopaque regions provide imaging visibility and torque resistance, while radiolucent regions minimize imaging distortion.
Solution Approach 2:
Different portions of the screw are assigned different material qualities based on local requirements. The tip and head are made radiopaque for torque resistance and visibility, while the body is made radiolucent to minimize stress shielding and improve imaging. This local differentiation resolves the contradiction between needing strength where applied and minimizing interference where imaging is critical.
2Loss of information
If radiolucent material is used for the screw body, then radiographic visualization is improved, but torque resistance and structural strength deteriorate
Solution Approach 1:
The screw structure is segmented into radiolucent body portions and radiopaque reinforcement portions (tip, head, or interspersed segments). The radiopaque segments are strategically positioned at locations requiring high torque resistance, while radiolucent material is used in regions where imaging clarity is paramount.
Solution Approach 2:
The screw employs composite construction combining radiopaque materials (metal alloys or radiopaque polymers) with radiolucent materials (PEEK or other radiolucent polymers). This composite approach allows the structure to simultaneously achieve the torque resistance of metal and the imaging advantages of radiolucent materials.
3Loss of information
If radiopaque markers are added to radiolucent screws, then visibility is improved, but structural strength and torque resistance deteriorate due to low torque properties
Solution Approach 1:
The radiopaque components are not merely added as separate markers but are merged into the structural integrity system of the screw. The radiopaque tip, head, or segments serve dual purposes: providing radiographic visibility and simultaneously providing the torque resistance and structural strength that markers alone cannot provide.
4Strength
If metal alloy implants are used, then torque resistance is improved, but stress shielding and bone healing assessment deteriorate due to obscuration of surrounding areas
Solution Approach 1:
The screw applies local quality differentiation by using radiolucent material in the body portions that contact and transmit load to the bone, minimizing stress shielding effects. Radiopaque materials are concentrated in the tip and head where torque application occurs, allowing torque resistance without extensive metal coverage that would cause stress shielding.
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 hybrid screw provides clear visualization during fluoroscopy and radiography, allowing for accurate placement and assessment of fracture healing, while minimizing breakage and reducing recovery time and costs by combining radiopaque components for enhanced visibility and torque with a radiolucent body for stress shielding.
Implementation Method 1
The radiopaque components block X-rays to provide enhanced visibility and minimize distortion during fluoroscopy and radiography
Implementation Method 2
The radiolucent body allows X-rays to pass through for clear imaging while providing mechanical support
Data Source
AI summary
A hybrid radiolucent screw having radiopaque components and radiolucent components, which collaboratively define a tip of the screw and a head of the screw. In this manner, distortion is minimized during fluoroscopy or radiography of the screw while visualization of the screw and surrounding area is enhanced.