Outwardly Tapering Inflation Balloon for Vertebral Height Restoration
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Solution Overview
Problem
Conventional inflatable bone tamps used in kyphoplasty procedures exhibit symmetrical expansion profiles, which can lead to suboptimal results in vertebral body height restoration due to expansion along the path of least resistance, often compressing cancellous bone instead of forcing apart endplates in fractured vertebrae.
Innovation Solution
An inflatable bone tamp with an outwardly tapering expansion profile, where the distal expansion is greater than the proximal, is designed to apply lifting forces more effectively to the endplates of a collapsed vertebral body, enhancing the likelihood of height restoration by incorporating features such as multiple lobes, varying wall thickness, or external restraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional symmetrical inflatable bone tamps are used, then the device structure is simple and easy to manufacture, but the expansion follows the path of least resistance compressing cancellous bone instead of forcing apart endplates, resulting in suboptimal vertebral body height restoration
Solution Approach 1:
The patent applies asymmetry by designing a balloon with an outwardly tapering expansion profile where the distal expansion is greater than the proximal expansion. This asymmetric geometry is specifically configured to force the balloon to expand distally towards the endplates rather than expanding symmetrically in all directions. The tapered profile creates a mechanical advantage that directs expansion forces preferentially in the distal direction, enabling the balloon to effectively separate endplates and restore vertebral body height.
Solution Approach 2:
The patent implements local quality by varying the wall thickness of the balloon, with the distal portion having a different wall thickness compared to the proximal portion. This local variation in structural properties allows different regions of the balloon to exhibit different expansion characteristics. The thinner distal wall facilitates greater distal expansion while the thicker proximal wall provides structural support, creating the desired outwardly tapering expansion profile that targets endplate separation.
2Manufacturing precision
If conventional symmetrical balloons expand in free space, then the expansion is uniform in all directions, but within the vertebral body the expansion follows the path of least resistance which compresses cancellous bone rather than restoring vertebral height
Solution Approach 1:
The asymmetric outwardly tapering expansion profile is designed to counteract the tendency of the balloon to follow the path of least resistance. By pre-configuring the balloon with greater distal expansion capability, the design ensures that even when inflated within the constrained vertebral body environment, the balloon will preferentially expand distally towards the endplates rather than uniformly in all directions or compressing cancellous bone.
Solution Approach 2:
The patent changes the geometric parameters of the balloon by implementing an outwardly tapering expansion profile with varying wall thickness. This parameter modification transforms the balloon's expansion behavior from symmetrical to asymmetric, enabling controlled directional expansion. The specific wall thickness variation creates different structural rigidities in different regions, guiding the expansion forces to achieve the desired clinical effect of endplate separation.
3Force
If the balloon expands with greater distal than proximal expansion, then lifting forces are applied more effectively to the endplates for height restoration, but the device structure becomes more complex with varying wall thickness and external restraints
Solution Approach 1:
The patent applies local quality by implementing varying wall thickness throughout the balloon structure. The distal portion of the balloon has a different wall thickness compared to the proximal portion, creating local differences in structural properties. This local variation enables the thinner distal section to expand more readily and generate greater distal expansion forces, while the thicker proximal section maintains structural integrity. This localized structural differentiation efficiently directs lifting forces to the endplates without requiring complex external mechanisms.
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 outwardly tapering expansion profile of the inflatable bone tamp effectively directs inflation force towards the endplates, improving vertebral body height restoration and reducing the risk of further fracturing, thereby alleviating pain and deformity associated with vertebral compression fractures.
Implementation Method 1
expansion profile that exhibits greater distal than proximal expansion (i.e., outwardly tapering)... when inflated
Data Source
AI summary
An inflatable bone tamp for performing a minimally invasive surgical procedure includes an inflatable structure having at least three contiguous lobes, that when inflated, cause the inflatable structure to exhibits an outwardly tapering expansion profile. By forming the inflatable structure such that the reduced-diameter junction(s) between the lobes has a greater wall thickness then the adjacent lobes, the durability and abrasion-resistance of the inflatable bone tamp can be increased.