Reciprocating Tissue-Removing Catheter Head for CTO Treatment
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Solution Overview
Problem
Current devices face challenges in effectively treating Chronic Total Occlusions (CTOs) by restoring patency in vascular lumens, as they struggle to efficiently remove occluding tissue such as plaque from blood vessels.
Innovation Solution
A tissue-removing catheter with a reciprocating tissue-removing head that rotates and moves between proximal and distal positions, equipped with an annular shearing blade and a driveshaft with a variable pitch helical thread, which cuts and transports tissue, facilitating its removal from occlusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a tissue-removing device is used to remove occluding tissue from CTOs, then patency of the vessel is restored, but the device fails to efficiently remove occluding tissue
Solution Approach 1:
The tissue-removing head is designed to reciprocate between a proximal position (adjacent to the shearing blade) and a distal position (spaced from the blade), creating dynamic motion that enhances tissue removal efficiency. This reciprocating motion allows the head to effectively cut and transport occluding tissue through the catheter, resolving the contradiction between productivity and reliability in CTO treatment.
2Productivity
If the tissue-removing head rotates and reciprocates, then tissue cutting and transport efficiency is improved, but device complexity increases
Solution Approach 1:
The device combines multiple functions into a single integrated tissue-removing head that simultaneously performs rotation and reciprocation. This merging of functions allows the head to both cut tissue during rotation and transport it during reciprocation, improving productivity while managing device complexity through functional integration rather than separate components.
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 catheter effectively removes occluding tissue by cutting and shearing it with the rotating and reciprocating head, allowing for efficient restoration of blood flow by transporting the tissue through the catheter for subsequent removal, thus addressing the limitations of existing CTO treatment devices.
Implementation Method 1
a driveshaft with a variable pitch helical thread, which cuts and transports tissue
Implementation Method 2
an annular shearing blade... effectively removes occluding tissue by cutting and shearing it
Data Source
AI summary
A tissue-removing catheter includes a catheter body and a tissue-removing head. The catheter body has an annular shearing blade at the distal end thereof. The tissue-removing head is at the distal end of the catheter body and is configured to rotate about an head axis relative to the catheter body, and reciprocate along the head axis relative to the catheter body between proximal and distal positions.