Micro-coil Assembly Tie Cutting Mechanism
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Solution Overview
Problem
Conventional mechanical methods for separating the micro-coil unit from the coil-pusher unit in micro-coil assemblies are complex and difficult to perform accurately at the desired position and timing, hindering precise insertion into aneurysms or vascular malformations.
Innovation Solution
A micro-coil assembly featuring a tie cutting unit with a first and second blade mechanism, allowing controlled cutting of the tie connecting the micro-coil unit and tensile wire, enabling precise separation of the micro-coil unit from the coil-pusher unit for accurate insertion into aneurysms or vascular malformations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional mechanical method using hooks is used to separate the micro-coil unit from the coil-pusher unit, then the separation can be achieved mechanically, but the method becomes complicated and difficult to perform accurately at the desired position and timing
Solution Approach 1:
The patent extracts the cutting function from the complex hook-based mechanical separation mechanism and implements it as a dedicated cutting unit with blades. This separate cutting unit is positioned at the front end of the coil-pusher unit and can be controlled independently to cut the tie at the precise moment and location needed, simplifying the overall separation mechanism while improving accuracy
Solution Approach 2:
The patent introduces a tie as an intermediary element that connects the micro-coil unit to the tensile wire, which in turn connects to the coil-pusher unit. This tie serves as a controlled connection that can be easily severed by the cutting unit, replacing the need for complex hook-based mechanical separation while enabling precise control over the separation timing and position
2Ease of operation
If the separation method is simplified, then the operation becomes easier, but the precision and control over separation timing and position may be compromised
Solution Approach 1:
The cutting unit is positioned at the front end of the coil-pusher unit and is controlled by the operator based on real-time feedback about the position of the micro-coil unit relative to the aneurysm. This allows the operator to initiate cutting at the precise moment when the micro-coil unit reaches the desired position, ensuring both ease of operation and high precision in separation timing and location
Solution Approach 2:
The cutting unit is pre-positioned at the front end of the coil-pusher unit before the procedure begins, ready to act immediately when needed. The tie is also pre-configured to connect the micro-coil unit to the tensile wire system, so that when the operator decides separation is needed, the cutting action can be executed instantly without requiring complex manipulation or repositioning of components
Data Source
AI summary
Disclosed is a micro-coil assembly including a micro-coil unit which is inserted into an aneurysm or other vascular malformation of a patient and prevents inflow of blood by inducing thrombus, a coil pusher unit which is arranged adjacent to the micro-coil unit and delivers the micro-coil unit to the aneurysm or other vascular malformation of the patient, a tensile wire which is relatively movably arranged in the coil pusher unit, a tie which connects the micro-coil unit and the tensile wire, and a tie cutting unit which is arranged adjacent to the coil pusher unit such that at least a part of the tie cutting unit is movable between a setting position for maintaining the tie in a tied state and a cutting position for cutting the tie, and cuts the tie when moved to the cutting position.