Line-Shaped Paw-Type Patella External Fixator Design
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Solution Overview
Problem
Current methods for treating patella fractures, such as tension band internal fixation and traditional external fixators, are invasive, limit joint function exercise, and often require secondary operations, leading to complications like incomplete healing and joint deformity.
Innovation Solution
A line-shaped paw-type patella external fixator with adjustable and minimally invasive designs, featuring pressure regulating fasteners and multiple fixing points, allowing for precise placement and adjustment of fixing needles without invasive surgery, enabling early joint function exercise and reducing the need for secondary operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional tension band internal fixation is used, then fracture can be fixed, but the operation is traumatic and requires secondary operation to remove implants
Solution Approach 1:
The external fixator is divided into multiple independent components: a main body structure with multiple fixing points, adjustable fastening mechanisms, and removable fixing needles. This segmentation allows the device to provide stable fixation while being easily adjustable and removable without secondary surgery.
Solution Approach 2:
The fixator incorporates dynamic adjustment mechanisms including threaded fastening screws that allow precise positioning of fixing needles, and adjustable fastening devices that enable the structure to be adapted to different fracture patterns and patient anatomies, providing both stability and flexibility.
2Object-affected harmful factors
If traditional external fixators are used, then invasive surgery is avoided, but they are cumbersome in installation and limit joint function exercise
Solution Approach 1:
The fixator is designed with modular components that can be independently positioned and secured. The multiple fixing points allow selective placement based on fracture location, simplifying the installation process while maintaining stability. The segmented design also permits easier adjustment and removal compared to traditional monolithic external fixators.
Solution Approach 2:
The main body structure incorporates multiple fixing points and adjustable fastening mechanisms that can accommodate various fracture patterns and anatomical variations. This multi-functional design allows the same device to be used for different fracture types without requiring complex customizations or limiting patient rehabilitation exercises.
3Object-affected harmful factors
If traditional external fixation binding is used, then no wound is created, but bone integration is hard to complete and stability is poor
Solution Approach 1:
The invention combines the advantages of both internal and external fixation by using an external fixator structure that applies controlled compression forces directly at multiple fracture sites through fixing needles. This merging approach achieves stable bone integration without creating surgical wounds, as the fixing needles can be inserted through small puncture sites that heal rapidly.
Solution Approach 2:
The fixator is designed to apply preliminary compression and stabilization forces to the fracture sites immediately upon application, creating optimal conditions for bone healing from the outset. The adjustable fastening mechanisms allow precise control of compression forces to be applied in advance, promoting bone integration before significant healing occurs.
Data Source
AI summary
The present invention provides two types of a line-shaped paw-type patella external fixator, comprising A type: two ends of a line-shaped main girder are respectively provided with pressure regulating fixing parts, an arc auxiliary girder is arranged below the line-shaped main girder, and two ends of the arc auxiliary girder are respectively provided with one auxiliary fastener and fixing needles; B type: one end of B type is the same with that of the A type, a b-shaped fixing part is provided below a q-shaped fixing part on the other end, a fixing needle is provided below the b-shaped fixing part, an auxiliary fastener is provided in the middle of the line-shaped main girder, and a splayed needle seat and an auxiliary fixing needle are arranged on both sides. The fixator has advantages of easy installation, wide adjustment range and minimal damage.