Femur Fixation Device with Detachable Positioning Bracket
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Solution Overview
Problem
Current femur fixation devices experience structural instability during long-term use, leading to delayed bone healing due to relative movement and rotation between the intramedullary nail and hip screw, despite measures like positioning bolts or non-circular configurations.
Innovation Solution
A femur fixation device with an intramedullary nail and hip screw featuring a lateral through hole with a detachable positioning bracket and groove system, along with a tail nail and elastic spacer, allowing for adjustable and secure fixation to prevent rotation and lateral movement, and a cutting blade portion for enhanced stability and ease of installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a positioning bolt or non-circular hip screw is used to fix the hip screw to the intramedullary nail, then the relative movement between the two components is reduced, but the positioning part becomes twisted and loosened under long-term external force, causing rotation and axial movement
Solution Approach 1:
The positioning bracket is designed with a detachable tail nail that can be adjusted and re-tightened. The bracket includes a positioning protrusion that engages with a positioning groove on the hip screw, creating a dynamic adjustment mechanism that maintains fixation stability over time by allowing correction of loosening without complete replacement of the device.
Solution Approach 2:
The positioning bracket acts as an intermediary component between the intramedullary nail and the hip screw. It provides a stable connection interface with the positioning protrusion and groove mechanism, distributing mechanical stresses and preventing direct transmission of twisting forces that would cause loosening of traditional positioning bolts.
2Device complexity
If traditional positioning methods are used, then the structure is simpler, but the fracture portion experiences rotation and lateral movement during long-term use
Solution Approach 1:
The positioning bracket introduces a new dimensional aspect to the fixation system by adding radial positioning protrusions that engage with corresponding grooves. This multi-dimensional engagement (axial through the tail nail, radial through the positioning protrusions) provides comprehensive stabilization against rotation and lateral movement while maintaining reasonable structural complexity.
3Ease of operation
If the positioning bracket is made detachable with a tail nail, then the device becomes easier to assemble and disassemble, but the connection mechanism becomes more complex
Solution Approach 1:
The positioning bracket is segmented into distinct functional components: the main bracket body with positioning protrusions, the detachable tail nail for axial fixation, and the limiting latch mechanism. This segmentation allows each component to be optimized for its specific function and enables easy assembly and disassembly while keeping the overall structure manageable.
Solution Approach 2:
The positioning protrusions and grooves are pre-configured in specific orientations and positions during manufacturing. The limiting slot and latch are pre-positioned to guide the assembly process, allowing the surgeon to simply insert and secure the components without complex alignment procedures, thus maintaining ease of operation despite the enhanced functionality.
Data Source
AI summary
A femur fixation device includes an intramedullary nail having along its longitudinal axis a proximal portion, a distal portion and a lateral through hole extending through the proximal portion; and a hip screw capable of passing through the lateral through hole. An axis of the lateral through hole intersects the longitudinal axis at a first inclination angle. The proximal portion includes a first through hole. The first through hole is provided with a detachable positioning bracket therein. A positioning protrusion is defined at a lower end of one side of the positioning bracket. A line connecting the positioning protrusion and corresponding end points on a sidewall of the positioning bracket intersects the longitudinal axis at a second inclination angle. An outer surface of the hip screw is provided with a positioning groove. A tail nail is disposed in the first through hole.