Dynamic Weight-Bearing Imaging Device for 4D Radiology
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Solution Overview
Problem
Current medical imaging technologies, such as 4DCT, struggle to capture dynamic weight-bearing conditions of the lower limb, as existing devices either restrict movement or are not compatible with all imaging modalities due to ferromagnetic materials, limiting the ability to study real-time joint motion and pathology insights.
Innovation Solution
A device comprising a base structure and a table that allows for dynamic movement by applying a load during flexion-extension movements, using radiolucent and non-ferromagnetic materials to enable imaging with various modalities like CT, MRI, and PET-CT, with adjustable shoulder supports and counteracting structures like counterweights or motors for controlled loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ferromagnetic materials are used in loading devices, then structural strength and stability are improved, but compatibility with MRI and other magnetic imaging modalities deteriorates
Solution Approach 1:
The patent changes the material parameter from ferromagnetic to non-ferromagnetic materials (such as aluminum, titanium, or carbon fiber composites), transforming the device's magnetic properties to enable compatibility with MRI and other magnetic-sensitive imaging modalities while maintaining sufficient structural strength through alternative material selections
Solution Approach 2:
The patent employs composite material structures combining non-ferromagnetic materials with appropriate mechanical properties, such as carbon fiber reinforced polymers or aluminum-titanium combinations, to achieve both structural integrity and magnetic compatibility simultaneously
2Productivity
If the patient is positioned in horizontal non-weight bearing condition, then 4DCT scanning can be performed, but the ability to capture weight-bearing joint motion and pathology deteriorates
Solution Approach 1:
The patent introduces a counterweight system with adjustable weights and pulleys that applies downward force on the foot platform, simulating body weight loading on the lower limb while the patient remains in horizontal position, thereby enabling weight-bearing imaging without requiring standing posture
Solution Approach 2:
The patent creates a dynamic loading system where the counterweight can be adjusted during scanning to match different patient weights, and the loading force can be modified in real-time to capture various weight-bearing conditions, enabling reliable simulation of physiological loading states
3Reliability
If static loading devices are used, then weight bearing condition is achieved, but the ability to capture real-time dynamic joint motion deteriorates
Solution Approach 1:
The patent transforms the static loading device into a dynamic system by enabling free movement of the foot platform along the longitudinal axis while maintaining vertical loading, allowing the lower limb to perform natural dynamic motions such as walking, running, or jumping cycles while continuously capturing weight-bearing conditions and joint kinematics in real-time
Data Source
AI summary
A device for use with a four-dimensional radiological imaging modality includes: a base structure and a table slidably mounted with respect to one another. The base structure is at one end provided with a platform at an angle relative to the table, and a counteracting structure is arranged to apply to the table a load exerting force in a direction towards the one end provided with the platform from the opposite end of the base structure or vice versa.