Segmented Augmentation Cone for Joint Revision
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Solution Overview
Problem
Conventional augmentation devices for joint endoprosthesis revision surgeries lack dimensional stability and are difficult to adjust in size without deformation, posing challenges in fitting and evenly distributing force during implantation, and may cause bone tissue damage or surgical risks.
Innovation Solution
An augmentation device with a biocompatible polymer cone featuring radially circumferential grooves that serve as saw guides for segment separation, allowing for adjustable size without deformation, and a method for adapting the cone size by sawing or cutting along these grooves, ensuring dimensional stability and safe surgical procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the augmentation device uses a predetermined fixed size, then manufacturing and inventory management are simplified, but it cannot be adapted to specific anatomical characteristics of different patients
Solution Approach 1:
The cone is divided into multiple separable sections by radially encircling grooves, allowing the device to be segmented into different sizes by removing one or more sections. This enables adaptation to various patient anatomies while starting from a single standardized device design.
Solution Approach 2:
The grooves are pre-formed during manufacturing as saw guides, preparing the device in advance for potential size adjustments during surgery. This preliminary preparation enables quick and accurate size adaptation without requiring complex intraoperative manufacturing processes.
2Adaptability or versatility
If flexible joints are used to compress the cone and reduce outer diameter, then size adjustment is enabled, but significant deformation occurs creating kinks that complicate fitting
Solution Approach 1:
Instead of deforming the entire cone structure through compression, the device segments the cone into removable sections. This allows size reduction by removing discrete portions rather than compressing the whole structure, thereby avoiding kinks and deformation of the remaining device.
Solution Approach 2:
Specific cone sections are extracted or removed from the device by cutting along the grooves. This extraction approach reduces the outer diameter by eliminating material rather than deforming existing material, preserving the structural integrity and shape of the remaining device.
3Adaptability or versatility
If metal mesh augmentation devices are used, then some adaptability is provided, but dimensional stability is lost affecting prosthesis stability
Solution Approach 1:
The device maintains dimensional stability by changing the parameter of cone size through removal of discrete sections rather than through material deformation or flexible structures. The rigid polymer material preserves its dimensional properties while the configurational parameter (size) is adjusted by section removal.
4Strength
If conventional augmentation devices are used, then anchoring function is provided, but uniform force distribution into bone tissue is not achieved
Solution Approach 1:
By precisely adjusting the cone size parameter to match the patient's specific anatomy through section removal, the device achieves optimal contact and force distribution across the bone interface. The customized fit ensures uniform force transmission while maintaining strong anchoring capability.
Data Source
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AI summary
The invention relates to an augmentation device (100, 100', 100") comprising an annular cone (200, 200', 200") surrounding a channel (300, 300') extending through the cone from a proximal to a distal cone end. The cone consists of at least 50% by volume of a biocompatible polymer and has at least three radially circumferential grooves (400, 400', 400") in a cone surface (230, 230', 230") opposite the channel, which divide the cone into annular cone segments (250, 250', 250"). The invention further relates to a method for adapting the cone size of such an augmentation device.