Radially Expanding Debridement Tool for Bone Lesion Treatment
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Solution Overview
Problem
Current core decompression procedures for treating avascular necrosis are limited in effectively addressing the volume of bone lesions due to the diameter constraints of existing debridement tools, which fail to adequately disrupt compromised bone tissue, especially in smaller joints.
Innovation Solution
A radially expanding debridement tool that creates a void with multiple steps, allowing for stepwise tissue disruption, enabling a support matrix to be inserted and expanded or tilted, reducing pressure necrosis and allowing for more effective treatment of bone lesions by creating a void with varying diameters through an access channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If drill bits are used for core decompression, then the integrity of surrounding cortical bone is maintained, but the volume of bone lesion treated is insufficient
Solution Approach 1:
The debridement tool is divided into multiple segments that can expand radially from a compact delivery profile to a larger treatment profile. The tool comprises a proximal segment and a distal segment that can be positioned at different depths, allowing stepwise creation of voids with varying diameters to treat larger bone lesion volumes while maintaining cortical bone integrity through controlled expansion.
Solution Approach 2:
The debridement tool transitions from a constrained delivery state to an expanded treatment state through radial expansion. This dynamic transformation allows the tool to pass through a narrow access channel and then expand to treat a larger volume of bone lesion, effectively resolving the contradiction between maintaining cortical integrity and treating sufficient lesion volume.
2Volume of stationary object
If expanding debridement tools are used, then larger voids can be created, but the tools are difficult to shrink down for smaller joints
Solution Approach 1:
The debridement tool features dynamic expandability and collapsibility, transitioning between a compact delivery profile for insertion through narrow access channels and an expanded treatment profile for creating large voids. This dynamic characteristic enables the same tool to adapt to different joint sizes and lesion volumes.
Solution Approach 2:
The debridement tool can be collapsed to a compact profile that nests within the delivery system, allowing it to pass through small access channels in smaller joints. Once positioned, the tool expands to its full treatment profile. This nesting capability provides versatility across different joint sizes while maintaining the ability to create large voids when needed.
3Ease of operation
If single ellipsoid voids are created, then the procedure is simple, but the amount of tissue disruption required is excessive
Solution Approach 1:
The void creation process is segmented into multiple steps with varying diameters, allowing targeted removal of only the necessary compromised bone tissue. The tool creates a proximal void section and a distal void section with different dimensions, matching the actual distribution of the bone lesion and minimizing unnecessary tissue disruption while maintaining procedural simplicity.
4Productivity
If the debridement tool is advanced beyond the carrier tube, then effective debridement is achieved, but control and positioning become more difficult
Solution Approach 1:
The carrier tube serves as an intermediary that guides and controls the debridement tool during insertion and positioning. The tool can be advanced beyond the carrier tube for effective debridement while the carrier tube remains in place to provide continued control and stabilization, resolving the contradiction between achieving effective debridement and maintaining ease of operation.
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 radially expanding debridement tool effectively treats tissue defects by creating a void with varying diameters, reducing the amount of tissue needed to be disrupted and minimizing pressure necrosis, allowing for deeper insertion and expansion of support matrices, thereby improving treatment outcomes for avascular necrosis.
Implementation Method 1
the wires are constrained in the access channel and, upon leaving the access channel, the wires expand due to their shape memory
Data Source
AI summary
Disclosed are radially expanding debridement tools configured to pass through an access channel present in a first tissue of a living being, expand radially, and create a void in a second tissue of the living being upon being advanced distally through the access channel and into the second tissue while being rotated, wherein the shape of the void comprises at least one step. Further disclosed are debridement systems and methods of treating tissue defects in living beings.