Embolic Coil Detachment Section Design for Microcatheter Kick-out Prevention
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Solution Overview
Problem
Current embolic coils used for treating intracranial aneurysms have long and stiff detachment sections, leading to microcatheter kick-out during coil detachment, which complicates the procedure and prolongs surgery due to the need for repeated microcatheter repositioning.
Innovation Solution
An embolic coil conveying device with a pusher and embolic coil design featuring a stretch-resistant thread fixed at the proximal end of the coil and a conductive wire with an insulating layer, where the conductive wire and stretch-resistant thread are directly cross-connected, reducing the detachment section length and increasing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a long detachment section is used to connect the embolic coil and pusher, then the connection strength is improved, but the microcatheter kick-out effect occurs and operation complexity increases
Solution Approach 1:
The detachment section is divided into multiple segments: a first detachment section with the conductive wire for electrolytic detachment, and a second detachment section with the stretch-resistant thread for mechanical detachment. This segmentation allows the system to achieve both strong initial connection and controlled detachment without causing microcatheter kick-out, as each segment serves a specific function in the detachment process.
2Stability of the object's composition
If a stiff detachment section is used to maintain structural integrity, then the connection stability is improved, but the microcatheter kick-out effect occurs and procedure time increases
Solution Approach 1:
The detachment section transitions from a static, stiff structure to a dynamic system with two distinct detachment mechanisms. The conductive wire provides initial structural stability, while the stretch-resistant thread provides a controlled mechanical detachment path. This dynamic design allows the system to maintain stability during delivery and then facilitate smooth detachment without microcatheter kick-out, reducing procedure time.
3Ease of operation
If the detachment section length is reduced to prevent kick-out, then the ease of operation is improved, but the connection strength may be compromised
Solution Approach 1:
The detachment section uses composite construction combining a conductive wire (for electrolytic detachment) and a stretch-resistant thread (for mechanical detachment). This composite structure maintains strong connection strength through the dual-material design while keeping the overall detachment section length short, preventing microcatheter kick-out and improving ease of operation.
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
This design minimizes microcatheter kick-out and enhances the success rate of embolic coil detachment, allowing for more precise and efficient treatment of intracranial aneurysms by reducing the detachment section length and improving flexibility.
Implementation Method 1
detachment point that is disconnected by means of electrolysis is located in this section
Data Source
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AI summary
An embolic coil conveying device and a preparation method thereof are disclosed. The embolic coil conveying device comprises a pusher and an embolic coil. A distal end of the pusher and a proximal end of the embolic coil are connected to serve as a detachment section. A stretch-resistant thread is disposed in the embolic coil. The stretch-resistant thread is fixed at the proximal end of the embolic coil. A conductive wire is disposed in the pusher. The stretch-resistant thread is connected to the conductive wire. Compared with the prior art, the present invention has the advantages that the stretch-resistant thread is fixed at the proximal end of the embolic coil, so that the stretch-resistant thread is connected to the conductive wire, thereby reducing the length of the detachment section, making the detachment section more flexible, and avoiding kick-out of a microcatheter due to release of the embolic coil.