Medical Device Rotation Structure with Notched Cutting Portion
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Solution Overview
Problem
Existing atherectomy devices face challenges in effectively defining directionality and applying sufficient torque to cut stenotic objects within blood vessels without risking puncture or uneven cutting.
Innovation Solution
A medical device featuring a rotation structure with a cutting portion, a first shaft for driving the rotation structure, and a second shaft that is tubular, bendable at two positions, and rotatable, allowing for defined directionality and effective cutting while maintaining a sufficient torque effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rotation body is brought into contact with the stenotic object to cut and remove it, then the stenotic object can be effectively removed, but the blood vessel may be punctured due to the cutting device reaching deep portions of the blood vessel
Solution Approach 1:
The catheter is divided into multiple sections with different functionalities: a cutting section with the rotation body for removing stenotic objects, and a protection section that covers deep portions of the blood vessel to prevent puncture. This segmentation allows simultaneous achievement of effective cutting and safety protection.
Solution Approach 2:
A protection section acts as an intermediary element between the cutting device and the blood vessel wall. This protection section extends beyond the cutting section to cover deep portions of the blood vessel, serving as a barrier that prevents the cutting device from puncturing the vessel while allowing the cutting operation to proceed.
2Ease of operation
If the catheter is twisted by hand to define directionality, then the direction can be defined, but the torque applied is insufficient because the direction can be easily shifted
Solution Approach 1:
The catheter incorporates a dynamic torque transmission mechanism that allows the operator to apply and maintain torque effectively. The catheter design enables progressive engagement and locking mechanisms that prevent direction shifting while maintaining ease of operation, allowing the operator to define directionality with sufficient torque application.
Data Source
AI summary
A medical device is disclosed for cutting an object in a body lumen. The medical device includes a rotation structure having a cutting portion and an outer surface of the cutting portion including a notch, and wherein a width of at least a proximal portion of the notch increases toward a proximal end of the notch; and a drive shaft connected to a motor and configured to be connected to the rotation structure to drive a rotation of the rotation structure.