Compressible Hollow Sleeve Augment for Easier Bone Removal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing augment devices for joint endoprosthesis face a conflict between firm seating for stability and easy removal, particularly due to bone defects and ingrowth of bony material, complicating re-operation and potential damage to surrounding tissue.
Innovation Solution
A hollow sleeve augment device with bending joints that allow compression for easier insertion and removal, featuring a wall with an inner and outer face, and a compressible design facilitated by elastic hinges and gripper means for secure attachment and extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the augment device is firmly seated in the bone cavity for stability, then the fixation strength is improved, but the ease of removal deteriorates
Solution Approach 1:
The augment device incorporates bending joints that enable the hollow sleeve to dynamically change its shape from an expanded state for firm seating to a compressed state for easy removal. The bending joints allow the device to adapt its rigidity based on operational requirements, being rigid during implantation and stabilization, yet flexible during removal when compressed by the extraction tool.
Solution Approach 2:
The device changes its geometric parameters through the bending joints, allowing transformation between expanded and compressed states. When compressed, the circumference and width of the hollow sleeve decrease, creating gaps that facilitate removal by breaking bone connections. This parameter change enables the same device to achieve both firm seating and easy removal.
2Ease of operation
If the hollow sleeve is compressed to reduce circumference for easier insertion, then the ease of operation is improved, but the fixation strength deteriorates
Solution Approach 1:
The bending joints provide dynamic shape adjustment capability, allowing the hollow sleeve to be temporarily compressed for insertion into tight bone cavities, then expanded to achieve firm seating and strong fixation. The device transitions from a flexible compressed state during insertion to a rigid expanded state during stabilization.
Solution Approach 2:
The hollow sleeve is preliminarily compressed using the extraction tool or during implantation to reduce its dimensions for easier insertion into the bone cavity. After insertion, the device naturally expands or is expanded to achieve proper fixation, with the bending joints enabling this shape transformation without compromising structural integrity.
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
Enables firm seating without compromising the ability to remove the device easily, minimizing damage to surrounding bone during re-operation by breaking ingrowth connections and facilitating removal through controlled compression.
Implementation Method 1
the hollow sleeve may be compressed under a force exerted from the outside, thereby achieving a decreased circumference and width of the hollow sleeve
Implementation Method 2
Depending on the rigidity of said bone tissue it will break under the compressive action of the augment device, thereby freeing the augment device
Data Source
AI summary
An augment device includes a hollow sleeve surrounding a channel extending through the hollow sleeve from a top to a bottom of the hollow sleeve, the hollow sleeve comprising a wall having an inner face and an outer face. The hollow sleeve includes at least one bending joint, the bending joint being configured for compressing the channel. Thereby the hollow sleeve may be compressed under an external force, leading to a decreased circumference and width of the hollow sleeve. This leads to a gap between the perimeter of the augment device and surrounding bone material, breaking any connections. By virtue of this, a much facilitated removal of the augment device can be achieved. Further, an extraction tool includes grippers for engaging and compressing the augment device, and further instruments, particularly a jig, for achieving an effective removal.