Spring-Loaded Microfracture Impactor for Curved Joints
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Solution Overview
Problem
Current microfracture surgery tools, such as hand-held picks and drills, are prone to instability, create large holes, and can lead to bone necrosis, making them inefficient for creating precise microfractures in curved or angled joints like the hip or shoulder.
Innovation Solution
A microfracture impactor tool with a guide tube and impactor wire, powered by a compression spring, allowing for precise and repeatable microfractures in bone, with a design that can be curved or angled to access hard-to-reach areas, reducing healing time and minimizing trauma.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hand-held picks and awls are used for microfracture surgery, then the procedure can be performed with simple tools, but the tools are unstable and create large holes that slow healing
Solution Approach 1:
The tool is divided into separate functional components: a guide tube for positioning, an impactor wire for creating microfractures, and a hammer mechanism for delivery. This segmentation allows each component to be optimized for its specific function while maintaining overall tool simplicity.
Solution Approach 2:
A guide tube serves as an intermediary element that guides the impactor wire to the precise location on the bone. This intermediary component enables accurate microfracture creation without requiring complex positioning systems, resolving the contradiction between tool simplicity and precision.
2Productivity
If picks and awls are impacted with a hammer, then microfractures can be created, but the tools are prone to skiving and become inaccurate in curved or angled joints
Solution Approach 1:
The guide tube and impactor wire are designed with curved configurations to match the anatomy of curved or angled joints. This curvature allows the tool to maintain accuracy and reliability in difficult-to-reach areas while preserving the productive hammer-impacted delivery mechanism.
Solution Approach 2:
The tool design changes the geometric parameters of the guide tube and impactor wire to accommodate curved and angled joint surfaces. By adjusting these parameters, the tool maintains both its ability to create microfractures efficiently and its accuracy in non-linear anatomical structures.
3Productivity
If drills are used to create microfractures, then holes can be created in bone, but rotational friction causes bone necrosis
Solution Approach 1:
The rotational drilling mechanism is replaced with a linear impactor wire delivery system. Instead of using rotational friction to create holes, the impactor wire is driven linearly through the bone using controlled impacts. This substitution eliminates the harmful rotational friction that causes bone necrosis while maintaining the ability to create microfractures efficiently.
Solution Approach 2:
The microfracture creation uses periodic impacts rather than continuous rotation. The impactor wire is delivered in controlled, intermittent impacts that create microfractures without generating the continuous friction heat that leads to bone necrosis. This periodic action preserves bone viability while achieving the desired microfracture effect.
4Productivity
If picks and awls create large holes (3mm or greater), then microfractures can be made, but the large hole size slows down the healing process
Solution Approach 1:
The tool design changes the critical parameter of hole size by using a thin impactor wire (typically 0.5-1.0mm) compared to traditional picks and awls that create 3mm or larger holes. This parameter change maintains the ability to create microfractures while significantly reducing the hole size to accelerate the healing process.
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 microfracture impactor tool enables precise and efficient creation of small microfractures, promoting faster articular cartilage regrowth with reduced healing time and minimizing bone trauma compared to existing methods.
Implementation Method 1
A microfracture impactor tool with a guide tube and impactor wire, powered by a compression spring
Data Source
AI summary
A microfracture impactor tool including a housing defining a central axis, the housing can include a proximal portion and an opposite distal portion. A handle can be connected to the distal portion of the housing and can extend outward therefrom. The impactor tool can include a grip that is pivotably connected to the proximal portion of the body near the handle. The impactor tool can include an impactor wire configured to impact bone, and a guide tube connected to the distal portion of the housing that is configured to retain the impactor wire.