Ratcheting Strut for Bone Fragment Alignment
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Solution Overview
Problem
Current fracture fixation devices lack effective mechanisms for precise length adjustment during fracture reduction and fixation, which is crucial for optimal alignment and stability of bone fragments.
Innovation Solution
A ratcheting strut system comprising a ratchet box, coaxial tubes with teeth, and a threaded rod, allowing for longitudinal adjustment through a ratchet mechanism, enabling precise repositioning of bone fragments in predetermined increments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fracture fixation device is designed to be simple and fixed in length, then the device complexity is reduced, but the ability to adjust length for precise alignment is lost
Solution Approach 1:
The strut transforms from a fixed-length component to a dynamically adjustable one through the integration of a ratchet mechanism and threaded rod, allowing the length to be modified during surgery while maintaining structural integrity when locked
Solution Approach 2:
The adjustment mechanism is divided into distinct functional segments: the ratchet box for directional control, the threaded rod for fine positioning, and the locking mechanism for stability, allowing each component to perform its specific function efficiently
2Manufacturing precision
If a ratcheting mechanism is added to allow length adjustment, then the adaptability for precise alignment is improved, but the device complexity increases
Solution Approach 1:
The ratchet mechanism provides self-locking functionality where the teeth engagement automatically maintains the adjusted position without requiring additional locking components or complex control systems, reducing overall device complexity while ensuring precision
Solution Approach 2:
The threaded rod acts as an intermediary between the adjustment force and the strut length, translating rotational motion into precise linear positioning while the ratchet mechanism mediates the directional control, distributing the complexity across multiple simple interacting components
3Adaptability or versatility
If the strut allows continuous adjustment, then the adaptability is improved, but the stability and locking capability may be compromised
Solution Approach 1:
The ratchet mechanism enables periodic adjustment through discrete tooth engagements, allowing the strut to be adjusted in controlled increments while each adjustment step is automatically locked, providing both adaptability through multiple adjustment cycles and reliability through consistent locking at each position
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 ratcheting strut system provides precise and adjustable length adjustment, facilitating better alignment and stability of bone fragments during fracture fixation, enhancing the effectiveness of fracture reduction procedures.
Implementation Method 1
a ratchet box including a through passage; a first tube sized to extend at least partially through the passage, the first tube including teeth that engage corresponding teeth associated with the ratchet box
Implementation Method 2
a threaded rod operatively coupled to a nut and a first fixation adapter, the threaded rod repositionably mounted to the first tube, where the nut is operatively coupled and repositionable with respect to the first tube
Data Source
AI summary
A ratcheting strut comprising: (a) a ratchet box including a through passage; (b) a first tube sized to extend at least partially through the passage, the first tube including teeth that engage corresponding teeth of the ratchet box; (c) a second tube mounted to the ratchet box in parallel with the first tube, the second tube operatively coupled to a second fixation adapter; and, (d) a threaded rod operatively coupled to a nut and a first fixation adapter, the threaded rod repositionably mounted to the first tube, where the nut is operatively coupled and repositionable with respect to the first tube.