Offset Bone Impaction Tool for Hip Revision Defect Filling
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Solution Overview
Problem
Current methods for introducing and impacting bone material into metaphyseal defects during hip joint endoprosthesis revision face challenges such as difficulty in inserting tools and insufficient filling of defects, leading to inadequate anchorage of the revision endoprosthesis.
Innovation Solution
An apparatus comprising an impaction tool and a guide element with a bore, where the impaction tool is connected to the guide element at a predetermined perpendicular distance, allowing precise guidance and compaction of bone material along a guide rod inserted into the bone, facilitating efficient filling of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If surgical chisels or other blunt objects are used to impact bone material into metaphyseal defects, then the process is simple, but it is difficult to introduce the tool into the defect and insufficient filling occurs
Solution Approach 1:
The patent introduces a guide element as an intermediary tool that facilitates the introduction of the impaction tool into the metaphyseal defect. The guide element has a guide opening that directs the impaction tool along a predetermined trajectory, making it easier to access the defect while maintaining precise filling. This intermediary structure resolves the contradiction by providing both ease of introduction and filling precision.
Solution Approach 2:
The patent positions the impaction tool laterally offset from the guide element's longitudinal axis, creating a perpendicular distance relationship. This dimensional arrangement allows the impaction tool to be introduced through a more accessible lateral approach while still delivering bone material precisely into the metaphyseal defect, thus improving both ease of operation and filling precision.
2Reliability
If metaphyseal defects are not sufficiently filled with bone material, then the implantation process is faster, but cavities form between the revision endoprosthesis and the femur leading to insufficient anchorage
Solution Approach 1:
The guide element provides a predetermined trajectory and positioning system that ensures complete filling of the metaphyseal defect. By guiding the impaction tool along a controlled path, the system provides feedback on the filling process, ensuring that no cavities are formed between the revision endoprosthesis and the femur, thereby guaranteeing reliable anchorage.
Solution Approach 2:
The guide element is positioned and configured in advance to define the exact trajectory and depth required for complete defect filling. This preliminary setup ensures that the impaction process will achieve sufficient bone material distribution before beginning, preventing cavity formation and ensuring reliable anchorage while maintaining efficient implantation.
3Manufacturing precision
If the impaction tool is positioned close to the guide element bore, then the structure is more compact, but the predetermined perpendicular distance cannot be achieved for proper impacting
Solution Approach 1:
The patent positions the impaction tool at a predetermined perpendicular distance from the guide element's longitudinal axis, rather than aligning it axially. This lateral offset in a perpendicular dimension allows the impaction tool to achieve proper impacting geometry while maintaining a relatively compact overall structure, as the offset distance can be optimized independently of the guide element length.
Data Source
AI summary
An apparatus for impacting bone material comprises an impaction element and a guide element having a bore. The bore has a longitudinal axis. The impaction tool is connected to the guide element, and is provided at a predetermined distance to the bore in a direction substantially perpendicular to the longitudinal axis of the bore. A guide rod may be connected to a medical device and can be inserted into the bore. Thus, the apparatus may be guided into a cavity adjacent the medical device for impacting bone material inserted into the cavity.