Extramedullary Compression Band for Bone Fracture Fixation
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Solution Overview
Problem
Conventional bone fixation methods, such as intramedullary rods and lag screws, often fail to consistently compress and stabilize fractures smoothly and evenly, with intramedullary rods obstructing the path for lag screws and requiring additional external fixation devices.
Innovation Solution
An extramedullary compression and fixation apparatus comprising a pre-curved, malleable band with bone engaging structures that applies compressive clamping force orthogonal to the fracture plane without passing through the intramedullary canal, allowing for secure fixation without additional external devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an intramedullary rod is used for fracture fixation, then the fracture is stabilized, but the path for lag screws is obstructed and additional external fixation devices are required
Solution Approach 1:
Instead of placing the compression device inside the bone (intramedullary), the patent inverts the approach by placing the compression device outside the bone (extramedullary). The extramedullary compression device applies force through the cortex to compress the fracture, eliminating the need for intramedullary rods and allowing lag screw placement without obstruction.
2Reliability
If lag screws are used to compress fracture fragments, then primary bone healing is encouraged, but the surgical procedure becomes more complex and time-consuming
Solution Approach 1:
The patent combines the functions of fracture compression and fracture stabilization into a single extramedullary device. The extramedullary compression device simultaneously compresses the fracture fragments (promoting primary healing) and provides structural stability, eliminating the need for separate lag screw placement and reducing surgical time.
3Stability of the object's composition
If multiple fixation devices are used to ensure fracture stability, then fracture reduction is maintained, but tissue trauma and procedural complexity increase
Solution Approach 1:
The patent extracts the essential function of fracture compression from the traditional intramedullary rod system and implements it through an extramedullary device. This single device provides both compression and stability functions that previously required multiple separate devices, thereby reducing tissue trauma and surgical complexity.
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 extramedullary apparatus effectively compresses and stabilizes bone fragments, eliminating the need for lag screws and intramedullary rods, providing stable fracture reduction and healing while minimizing tissue trauma and procedural complexity.
Implementation Method 1
a pre-curved, malleable band having a first end and a second end... Upon the band being compressed, the band is configured to maintain compression on the bone across the bone fracture plane
Implementation Method 2
The at least one bone engaging structure can be any of a tooth, a pin, a ridge, a blade, or other cortically superficially engaging structure that is configured to dig into the outer cortex of the bone when the band is compressed to secure the band in position on the bone and inhibit relative movement therebetween
Data Source
AI summary
An extramedullary compression and fixation apparatus consists of a pre-curved, malleable band having a first end and a second end, and at least one bone engaging structure protruding from the band toward an interior space defined by the band. The band is configured to be compressed (e.g., crimped) over a bone fracture site to conform the curvature of the band to a curvature of a surface of bone around the bone fracture site. The at least one bone engaging structure is configured to dig into the outer cortex of the bone when the band is compressed. The band is configured to maintain compression of the bone across the bone fracture upon the band being compressed without additional external fixation devices.