Magnetic Fixing System for Tibial Resection Guide Alignment
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Solution Overview
Problem
Existing fixation systems for tibial resection guides during joint prosthesis implantation either cause hematomas due to clamping force or damage healthy bone tissue by screwing into the heel bone, and fail to accommodate varying anatomical sizes effectively.
Innovation Solution
A magnetic fixing system comprising a flexible magnetic band and a magnet carrier that magnetically attaches to the patient's limb, providing a form-fit and force-fit fixation without screws or clamping arms, allowing for easy and precise adjustment and detachment with one hand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixation clamp with spring-prestressed clamp arms is used to grip the tibia, then the aligning device can be securely fixed to the limb, but the clamping force causes hematomas on the patient's body
Solution Approach 1:
The patent replaces the mechanical spring-prestressed clamp arms with a magnetic fixing system. The magnetic band with magnetic elements and the carrier device with a magnet create a magnetic attraction force that secures the aligning device to the tibia without mechanical clamping, thereby eliminating hematoma formation while maintaining fixation security.
2Reliability
If screws are drilled into the heel bone to fix the aligning device, then stable fixation is achieved, but healthy bone tissue is damaged
Solution Approach 1:
The patent substitutes the invasive mechanical screw fixation system with a non-invasive magnetic fixing system. The magnetic band and magnet create secure fixation through magnetic attraction without penetrating or damaging the heel bone, thus maintaining fixation stability while avoiding bone tissue damage.
3Manufacturing precision
If a rigid fixation clamp is used to ensure precise alignment, then the resection plane can be accurately defined, but the device cannot be easily adjusted or detached
Solution Approach 1:
The patent implements a dynamic magnetic fixing system where the magnetic band with movable magnetic elements can be easily adjusted along the tibia to different positions. The magnetic attraction force maintains secure fixation at any position while allowing simple adjustment and detachment, combining alignment precision with operational ease.
4Adaptability or versatility
If a fixation system with multiple components and adjustment possibilities is used, then various anatomical sizes can be accommodated, but the device complexity increases
Solution Approach 1:
The patent divides the magnetic band into multiple segments with individual magnetic elements that can be independently positioned and adjusted. This segmentation allows the system to adapt to various anatomical sizes by reconfiguring the magnetic elements, while keeping each individual component simple and reducing overall system complexity.
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 magnetic fixing system ensures secure, hematoma-free fixation and easy adjustment for different anatomical sizes, reducing bone damage and operational complexity, while allowing for precise alignment of the tibial resection plane.
Implementation Method 1
a fixing magnet (14), which is arranged/attached to a front side or to a terminal/front side portion of the carrier device (12) and together with the carrier device (12) forms a magnetic carrier (11), and comprises a separately formed, in particular flexible, magnetic band (16), which or the front side of which is formed to attract the fixing magnet (14), so that the fixing magnet (14) is detachably magnetically adhered to the front side of the magnetic band (16)
Data Source
AI summary
A fixing system for an aligning device of a tibial resection guide for fixating attachment to a limb and an aligning device having the fixing system. The fixing system includes a carrier device having an attachment portion for attaching to an adjustment rod, a fixing magnet arranged on a front side of the carrier device, and a magnetic band adapted to be attracted to the fixing magnet and adapted to be attached to the limb of a patient.