Rotating Cutter Guide Groove for Distal Debris Collection
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Solution Overview
Problem
Existing medical devices struggle to effectively collect debris generated by cutting objects like plaque or thrombus, especially when the suction port is not close to the acting portion or is on the upstream side of the blood flow, leading to inefficiencies in debris removal.
Innovation Solution
A medical device with a cutter having a guide portion on its outer peripheral surface that extends in a direction opposite to its rotation direction, guiding debris to a distal end opening for collection, and featuring a slit or groove to facilitate direct debris collection into a lumen, while limiting depth and width to prevent tissue damage and excessive blood discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the suction port is positioned away from the acting portion or on the upstream side of blood flow, then the device structure is simplified, but the ability to collect cut debris is compromised
Solution Approach 1:
Instead of positioning the suction port upstream or away from the acting portion, the patent inverts the approach by positioning it downstream at the distal end, where debris naturally accumulates due to blood flow direction, thereby improving debris collection efficiency while maintaining simplified device structure
Solution Approach 2:
The patent introduces a guide portion as an intermediary structure on the cutter that actively directs debris toward the distal end opening, mediating between the cutting action and the suction port to ensure efficient debris collection even when the suction port is positioned downstream
2Productivity
If the guide portion is made deeper or wider, then debris conveyance efficiency is improved, but the risk of blood vessel perforation and excessive blood discharge increases
Solution Approach 1:
The guide portion features varying depth and width along its length, with the distal end having greater dimensions than the proximal end. This local variation optimizes debris conveyance at the distal end where debris accumulates, while maintaining safety margins at the proximal end to prevent blood vessel perforation
Solution Approach 2:
The patent employs controlled parameter changes in the guide portion dimensions, specifically making the depth and width greater at the distal end compared to the proximal end. This parameter gradient allows efficient debris collection while preventing excessive blood discharge and vessel damage
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 collects debris by guiding it to the distal side, reducing the risk of blood vessel perforation and excessive blood loss, and enhancing debris conveyance efficiency.
Implementation Method 1
the guide portion applies a force to the distal side to a contacting object
Implementation Method 2
a cutter that cuts an object, the cutter being fixed to a distal end of the drive shaft
Data Source
AI summary
A medical device includes: an elongated shaft portion that includes a drive shaft which is rotatable and a fluid lumen; and a cutter that cuts an object, the cutter being fixed to a distal end of the drive shaft and including a lumen communicating with the fluid lumen and a distal end opening communicating with the lumen, wherein the cutter has at least one guide portion that is a groove and/or a slit on an outer peripheral surface, and the guide portion extends in a direction opposite to a rotation direction in a distal direction.