Echogenic Coating for Deep Tissue Ultrasound Imaging
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Solution Overview
Problem
Current echogenic coatings for medical devices are not suitable for deep tissue ultrasound detection, leading to decreased image resolution at depths greater than 5 cm, and can cause over-scattering and discomfort due to adhesion issues.
Innovation Solution
A new echogenic coating composition with microparticles of specific size and density ranges (10-250 µm, 10-450 particles/mm²) is applied to medical devices, optimized for improved ultrasound visibility in deep tissue structures using convex probes, avoiding bilayer formation and adhesion problems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional echogenic coatings with microparticles are used to improve ultrasound visibility, then reflectivity increases, but image resolution deteriorates due to over-scattering and blurriness
Solution Approach 1:
The patent applies parameter changes by adjusting microparticle diameter from the conventional 10-45 μm range to a larger 150-250 μm range, and modifying surface density from 45-450 particles/mm² to a lower 10-450 particles/mm². These parameter changes optimize the balance between reflectivity and image resolution, preventing over-scattering while maintaining adequate signal return for deep tissue imaging.
2Illumination intensity
If higher microparticle density is applied to enhance visibility, then ultrasound signal strength increases, but adhesion problems and discomfort occur
Solution Approach 1:
The patent modifies the surface density parameter from conventional high density (45-450 particles/mm²) to an optimized range (10-450 particles/mm²) that provides adequate signal strength without excessive particle accumulation. This parameter adjustment prevents adhesion-related discomfort while maintaining sufficient ultrasound visibility.
3Length of stationary object
If existing coatings are used for deep tissue imaging, then visibility is attempted, but image resolution decreases at depths greater than 5 cm
Solution Approach 1:
The patent implements parameter changes specifically tailored for deep tissue imaging by using larger microparticle diameters (150-250 μm) that provide sufficient reflectivity at greater depths, combined with optimized surface density (10-450 particles/mm²) to maintain image resolution. This configuration enables effective imaging at depths exceeding 5 cm while preserving acceptable image quality.
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 new coating composition provides enhanced ultrasound visibility with a contrast of at least 25, allowing accurate localization of medical devices at depths greater than 5 cm, reducing image blurriness and adhesion issues, and maintaining smoothness for clinical use.
Implementation Method 1
The ultrasound pulses echo off tissues with different reflection properties and are recorded and displayed as an image. This principle may also be used to locate or visualize an inserted device.
Implementation Method 2
Too much signal or an overly bright picture works contra productive as it leads to over-scattering and an unclear, blurry and distorted image
Data Source
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AI summary
The invention relates to the use of an echogenic coating composition on a medical device to be inserted into a body at depths greater than 5 cm, comprising: (i) a polymer matrix and (ii) an amount of ultrasound-reflective microparticles having a diameter that is at least 10 and at most 250 µm in size, with a defined relationship between the particle size, expressed as D 50, and the surface density. The invention further relates to a method for ultrasound detection of a medical device at a scan depth greater than 5 cm, by providing the medical device with the echogenic coating composition and to an echogenic assembly comprising the medical device and a convex probe.