Rotatable Bone Reduction Frame for External Fixator
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Solution Overview
Problem
Conventional external fixators lack the ability to expand the bone reduction area and ensure rotational degree of freedom, limiting the effective correction of bone conditions during minimally invasive fracture reposition surgery.
Innovation Solution
An external fixator with rotatable frames on upper and lower frames, allowing rotation in both horizontal and vertical directions, which includes a variable leg with adjustable length and a rotating frame that surrounds the bone for enhanced alignment and fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a frame is installed in a fixed state without rotating on upper and lower frames, then the structure is simple and stable, but the bone reduction area cannot be expanded and rotational degree of freedom is not ensured
Solution Approach 1:
The frame is designed to rotate around the bone along an axial direction, transforming from a static fixed structure to a dynamic adjustable structure. This allows the bone reduction area to be expanded while maintaining structural stability through controlled rotational movement.
Solution Approach 2:
The frame adds rotational degree of freedom around the bone, moving from a single-plane fixed structure to a multi-dimensional adjustable structure. This enables correction of bone conditions in multiple orientations without significantly increasing overall structural complexity.
2Adaptability or versatility
If a conventional fixed frame is used, then the device is simple to operate, but the rotational degree of freedom is not ensured and bone correction is limited
Solution Approach 1:
The frame incorporates rotational joints that allow controlled movement around the bone, providing necessary degrees of freedom for correcting various bone conditions while maintaining ease of operation through intuitive rotational adjustment mechanisms.
3Adaptability or versatility
If the frame is made rotatable around the bone, then the bone reduction area is expanded and rotational freedom is ensured, but the device complexity increases
Solution Approach 1:
The frame is divided into modular segments that can rotate independently around the bone. This segmentation allows each component to perform a specific function, reducing overall complexity while achieving comprehensive bone correction capability through coordinated rotation of multiple segments.
Solution Approach 2:
The rotatable frame design serves multiple functions: it provides structural support, enables bone reduction through rotation, and allows correction of various bone conditions. This multi-functionality reduces the need for separate specialized components, thereby managing device complexity while enhancing bone correction capability.
Data Source
AI summary
Provided is an external fixator having a rotatable bone reduction frame for reduction of a fractured or deformed bone, which includes: a first frame through which the bone passes; a second frame through which the bone passes, the second frame being spaced apart from the first frame; a variable leg having both ends respectively connected to the first frame and the second frame and having a changeable length; and a rotating frame mounted to at least one frame of the first frame and the second frame to surround the bone entirely or partially, the rotating frame being rotatable based on at least one direction of a horizontal direction traversing the at least one frame and a vertical direction perpendicular to the horizontal direction as an axial direction.