Rotating Atherectomy Device with Segmented Cutting and Non-Cutting Portions
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Solution Overview
Problem
Current medical devices for treating stenosed sites in coronary arteries, such as those with calcified or hardened plaques, face challenges in safely cutting through calcified lesions and bifurcated portions, often risking damage to normal blood vessels due to the design of existing atherectomy devices.
Innovation Solution
A medical device with a rotatable drive shaft and a structure featuring a cutting portion and a non-cutting portion, where the cutting portion has a first and second cutting portion, and the non-cutting portion has a first and second non-cutting portion, designed to interpose the non-cutting portions between the cutting portions to minimize tissue damage, with specific radii and axial lengths to ensure safe and effective cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotating body with polishing material is used to cut stenosis, then cutting capability is improved, but risk of damage to normal blood vessel increases
Solution Approach 1:
The rotating body is divided into multiple circumferential sections, with alternating cutting portions and non-cutting portions around its circumference. This segmentation allows the device to cut stenosis effectively while periodic contact with non-cutting portions prevents continuous damage to the blood vessel wall.
Solution Approach 2:
Different portions of the rotating body have different surface properties: cutting portions have rough surfaces with polishing material for effective cutting, while non-cutting portions have smooth surfaces that minimize damage when contacting the blood vessel wall. This local differentiation of surface quality resolves the contradiction between cutting effectiveness and vessel safety.
2Productivity
If cutting portions are increased to improve stenosis removal, then cutting efficiency is improved, but risk of vascular perforation increases
Solution Approach 1:
The rotating body is divided into multiple circumferential sections, with alternating cutting portions and non-cutting portions around its circumference. This segmentation allows the device to cut stenosis effectively while periodic contact with non-cutting portions prevents continuous damage to the blood vessel wall.
Solution Approach 2:
During rotation, the cutting portions and non-cutting portions alternately contact the blood vessel wall in a periodic manner. This periodic action allows cutting to occur at specific intervals while providing regular pauses where the smooth non-cutting portions contact the vessel, preventing perforation even when cutting portions are numerous.
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 device effectively cuts stenosed sites while reducing damage to biological tissue by using a stepwise cutting mechanism, ensuring safety and improved cutting capacity, and can freely pass through blood vessels with reduced risk of vascular perforation.
Implementation Method 1
The cutting portion has abrasive grains such as diamond grains
Implementation Method 2
the non-cutting portion has a smoother outer peripheral surface than the cutting portion with respect to a blood vessel
Data Source
AI summary
A medical device and a treatment method are disclosed, which can effectively cut an object inside a biological lumen and can improve safety by reducing damage to a biological tissue. A medical device is disclosed for cutting the object inside the biological lumen. A structure rotated by a drive shaft has a first cutting portion, a second cutting portion located more proximal than the first cutting portion, a first non-cutting portion located between the first cutting portion and the second cutting portion, and a second non-cutting portion located on a proximal side of the second cutting portion.