Circular Fixator Rings With Recessed Slots for Secure Wire Fixation
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Solution Overview
Problem
Existing circular fixators for orthopedic procedures face challenges in securely attaching fixation devices to bones due to slippage and require complex tool-based assembly, which complicates the surgical process.
Innovation Solution
The circular fixator system features rings with slots and recesses for secure attachment of fixation devices, allowing pre-loading and easy assembly, and includes leg positioners for stable limb support without tools, along with innovative wrench designs for efficient bolt tightening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional circular fixators are used with prebuilt frames and multiple components, then the fixation can be applied to long bones, but the assembly process becomes complex and time-consuming
Solution Approach 1:
The fixator is divided into modular components including a circular frame with multiple rings, adjustable struts, and detachable fixation devices. Each component can be independently selected and assembled, allowing customization for different bone sizes and fracture patterns while simplifying the overall assembly process through standardized connection interfaces.
Solution Approach 2:
The fixation devices are pre-loaded onto the rings with wires and pins positioned in advance. This preliminary preparation eliminates the need for complex intraoperative assembly operations, reducing surgical time and complexity while maintaining full fixation functionality.
2Reliability
If traditional fixation devices are used, then wires can be secured to the frame, but slippage occurs and secure attachment is compromised
Solution Approach 1:
The fixation devices feature asymmetric geometries where the wire engagement portion has a different shape and orientation than the ring attachment portion. This asymmetric design creates a mechanical interlock that prevents slippage in the wire direction while allowing easy insertion and removal through the asymmetric interface.
Solution Approach 2:
The rings and fixation devices incorporate curved surfaces and rounded geometries that facilitate smooth engagement and secure attachment. The curved interfaces allow for gradual engagement of the wire with the fixation device, distributing contact forces and preventing slippage while maintaining ease of operation.
3Ease of manufacture
If complex tool-based assembly is used, then the fixator can be assembled, but the surgical process is complicated and time-consuming
Solution Approach 1:
The fixator components are designed with self-aligning and self-securing features that allow assembly without specialized tools. The rings, struts, and fixation devices incorporate interference fits, cam mechanisms, and snap-fit connections that enable surgeons to assemble the fixator quickly and easily during surgery, significantly improving surgical efficiency.
4Adaptability or versatility
If the leg is eccentrically located in the frame, then the posterior musculature can be accommodated, but additional positioning tools are required
Solution Approach 1:
The leg positioners incorporate adjustable and movable components that can be dynamically positioned to accommodate different leg sizes and musculature. The positioners feature adjustable struts, movable supports, and customizable geometries that allow the frame to adapt to various patient anatomies without requiring additional specialized tools.
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.