Inclined Ring Blade Removal Device for Hard Thrombi Aspiration
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Solution Overview
Problem
Existing devices struggle to effectively remove hard and large thrombi from blood vessels without damaging the sheath or causing blockages, as they are unable to accommodate the thrombi's three-dimensional shape and may slip off the object during removal.
Innovation Solution
A removal device with an elongated shaft and a cutting part featuring a ring-shaped blade inclined at an angle less than 90 degrees to the shaft's axis, combined with an expandable net or sheath, allows for effective cutting and aspiration of thrombi by catching and cutting the object without damaging the sheath.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separator is used to lead thrombi into the sheath, then thrombi can be guided into the sheath, but hard and large thrombi cannot be led into the sheath
Solution Approach 1:
The device divides the thrombus removal process into two stages: first cutting the thrombus into smaller pieces using the cutting part, then aspirating the fragmented thrombi through the sheath. This segmentation allows the device to handle hard and large thrombi that would otherwise be too big to pass through the sheath opening.
Solution Approach 2:
The cutting part acts as an intermediary between the sheath and the thrombus. It is positioned distal to the sheath opening to cut the thrombus into manageable pieces before they are aspirated into the sheath, enabling the removal of large and hard thrombi without damaging the sheath.
2Productivity
If the cutting blade surface is inclined at a large angle to the center axis, then cutting efficiency is improved, but damage to the sheath increases
Solution Approach 1:
The cutting blade surface is inclined at a specific angle range (0-90 degrees) relative to the center axis of the elongated shaft part. This parameter optimization allows the blade to effectively cut thrombi while minimizing contact with and damage to the sheath during the aspiration process.
3Ease of operation
If the expandable part is used to catch objects, then object capture is improved, but the risk of object slippage and sheath damage increases
Solution Approach 1:
The cutting part is positioned and activated before the expandable part engages with the thrombus. By cutting the thrombus into smaller pieces in advance, the device reduces the risk of slippage and minimizes the force required for capture, thereby protecting the sheath from damage.
Solution Approach 2:
The device segments the thrombus into smaller pieces through the cutting part before the expandable part attempts to capture it. This segmentation makes the thrombus easier to retain in the expandable part and reduces the likelihood of slippage and sheath damage.
4Strength
If a rigid cutting structure is used, then cutting capability is improved, but the risk of slipping off the object increases
Solution Approach 1:
The expandable part is constructed as a flexible mesh structure that can adapt to the shape of the thrombus while maintaining cutting capability through the rigid cutting part. This combination allows the device to securely retain the thrombus without slipping, while still providing effective cutting action.
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 efficiently cuts and removes thrombi by minimizing slippage and sheath damage, ensuring continuous aspiration and removal without clogging, even for large or complex objects.
Implementation Method 1
the cutting part includes a cutting blade surface to be brought into contact with objects in the living body during axial movement of the cutting part in the proximal direction to cut the objects
Implementation Method 2
The expandable net includes a plurality of gaps that pass through the expandable net. The expandable net also includes a release opening that passes through the expandable net, with the release opening being larger than the gaps so that an object that has entered an interior of the expandable net by way of the gaps is able to be released out of the interior of the expandable net by way of the release opening.
Implementation Method 3
an elongated sheath, an elongated shaft part, a cutting part, and an expandable net. The elongated sheath includes a lumen possessing a distal end that is open and a proximal end that is open, with the lumen in the elongated sheath being connectable to an aspirating device that produces an aspiration force in the lumen to draw the objects into the lumen in the elongated sheath and toward the proximal end of the elongated sheath.
Data Source
AI summary
A removal device and a removal system are configured to effectively remove an object in a body lumen while suppressing damage to another device. The removal device includes an elongated shaft part, and a cutting part fixed to a distal portion of the shaft part. The proximal portion of the cutting part includes a ring-shaped cutting blade, and a surface of the cutting part on which the cutting blade is positioned is inclined relative to center axis of the shaft part at an angle greater than 0 degrees and less than 90 degrees.