In-vivo Indwelling Instrument Resin Tip Fixation
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Solution Overview
Problem
Existing in-vivo indwelling instruments for vascular embolization face issues with the stretch resistant member straying from the coil during delivery, leading to incomplete deployment and potential residual components in blood vessels.
Innovation Solution
A coil with a resin tip and a stretch resistant member connected through a lumen, featuring a contacting and separating part design to secure the resin tip within the coil, preventing straying and ensuring visual confirmation of the fixed state, along with a producing method involving a tubular member to melt and flow into the separating part for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the strength of the distal end part is low, then the flexibility of the indwelling instrument is improved, but the stretch resistant member may stray from the coil during delivery
Solution Approach 1:
The coil is divided into a contacting part where adjacent wires touch and a separating part where they do not. The resin tip is positioned in the separating part, creating distinct functional zones that allow flexibility at the distal end while providing a secure anchoring point to prevent the stretch resistant member from straying.
Solution Approach 2:
The resin tip acts as an intermediary component that connects the stretch resistant member to the coil structure. By positioning the resin tip in the separating part, it provides a secure attachment point that prevents the stretch resistant member from moving while maintaining the overall flexibility of the distal end.
2Reliability
If the resin tip is firmly fixed in the coil, then the stretch resistant member does not stray, but it becomes difficult to visually confirm the fixed state
Solution Approach 1:
The patent makes the resin tip visible by positioning it in the separating part where it can be observed, or by using color differentiation. This allows visual confirmation of the fixed state while maintaining firm fixation of the stretch resistant member through the resin tip-coil connection.
3Ease of manufacture
If the coil structure is simplified, then the manufacturing process is easier, but the ability to prevent straying of components is reduced
Solution Approach 1:
The coil is segmented into contacting and separating parts, which can be formed using standard winding processes. This segmentation provides the necessary functionality to prevent component straying while maintaining compatibility with existing manufacturing methods, avoiding the need for complex additional structures.
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 solution effectively inhibits the resin tip and stretch resistant member from straying, ensuring complete deployment and securing the flexibility of the distal end part, facilitating accurate placement and retrieval without residual components in blood vessels.
Implementation Method 1
heating the tubular member
Implementation Method 2
a part of the tubular member that is heated is melted to flow into the separating part
Data Source
AI summary
An in-vivo indwelling instrument in which a stretch resistant member or a resin tip at a distal end part of a coil does not easily stray from the coil, a delivering system for the in-vivo indwelling instrument, and a method for producing the in-vivo indwelling instrument is disclosed. An in-vivo indwelling instrument includes: a coil that is formed by winding a wire; a resin tip connected to a distal end part of the coil; and a stretch resistant member that is provided in a lumen of the coil and is connected to the resin tip. The coil includes a gap portion, and a part of the resin tip exists in the gap portion.