Circular Fixator Ring Structure for Secure Wire Fixation
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Solution Overview
Problem
Existing circular fixators for orthopedic procedures face challenges in securely fixing wires to bones due to slippage and require complex assembly, especially when eccentric positioning is needed, such as in standard triple arthrodesis procedures.
Innovation Solution
The circular fixator system includes rings with slots and recesses for fixation devices, featuring scallop-shaped recesses and pre-loaded bolts with washers to prevent slippage, and leg positioners for easy adjustment and fixation, allowing quick and secure attachment of wires and rods without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If prebuilt frame with two tibial rings and foot plate is used for standard triple arthrodesis, then the fixation structure is provided, but the assembly is complex and requires multiple components
Solution Approach 1:
The circular fixator is divided into multiple independent rings (first ring, second ring, third ring) that can be separately positioned and secured around different portions of the limb. Each ring can be independently adjusted and fixed using fixation devices, allowing the system to accommodate various fixation requirements without requiring a complete prebuilt frame assembly.
Solution Approach 2:
The circular fixator system is designed to be universally applicable for multiple orthopedic procedures including triple arthrodesis, open or closed fracture fixation, pseudoarthrosis, limb lengthening, and correction of bony or soft tissue deformities. The same basic ring structure with slots and recesses can accommodate different fixation devices and wire configurations for various surgical applications.
2Reliability
If wires are inserted through bones and secured to frame using bolts, then fixation is achieved, but slippage may occur and secure fixation is difficult to maintain
Solution Approach 1:
The slot and recess structure acts as an intermediary mechanism between the wire and the ring. The slot receives the wire and the recess provides a securing location, creating a reliable connection that prevents wire slippage without requiring complex bolted fastening procedures. The recess can engage with the wire or a fixation device to maintain secure fixation.
3Ease of operation
If the leg is eccentrically located in the frame to accommodate posterior musculature, then proper positioning is achieved, but additional components and adjustment mechanisms are required
Solution Approach 1:
The circular fixator rings are designed to be dynamically adjustable rather than fixed in a predetermined configuration. Each ring can be independently positioned around the limb and adjusted to the desired location, allowing the surgeon to accommodate eccentric positioning requirements for posterior musculature without requiring a complex prebuilt frame with fixed adjustment mechanisms.
4Reliability
If multiple fixation devices and components are used to prevent slippage, then fixation security is improved, but the assembly and operation become more complex
Solution Approach 1:
The slot and recess features are integrated directly into the ring structure itself, combining the fixation function with the basic ring component. This eliminates the need for separate, complex fixation devices while maintaining reliable slippage prevention. The recess can engage with the wire or a simple fixation device to secure the wire in place.
Data Source
AI summary
A device includes a plurality of rings. Each ring has a first face, a second face, and at least one slot defined by first and second interior edges of the ring on opposing sides of the slot. The at least one slot penetrates from the first face to the second face. The first face of each ring has a first recess adjacent the slot on the first edge and a second recess adjacent the slot on the second edge. A plurality of posts join each one of the plurality of rings to an adjacent one of the plurality of rings.