Split-Tube Detachment Assembly for Reliable Coil Release
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Solution Overview
Problem
Existing detachment systems for implantable medical devices, such as embolic coils, lack a reliable mechanism for ensuring complete release and deployment, particularly in the delicate environment of cranial blood vessels, and often require complex and expensive designs.
Innovation Solution
A detachment system comprising a distal tube with a compressible portion and a proximal tube joined by a coupling, utilizing a loop wire and locking member to securely engage and deploy the device, allowing for rapid release through axial adjustment of the compressible portion from a compressed to elongated condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single tubular carrier with a single compressible section is used, then the device structure is simple, but the release speed is insufficient and deployment reliability is compromised
Solution Approach 1:
The tubular carrier is divided into multiple compressible sections (first compressible section and second compressible section) along its length, allowing sequential compression and faster deployment of the implantable medical device, resolving the contradiction between structural simplicity and release speed
2Device complexity
If traditional detachment systems without positive separation means are used, then the control mechanism is simple, but the deployment reliability is insufficient
Solution Approach 1:
The system incorporates a positive separation mechanism that is pre-configured to actively push the implantable medical device away from the distal end of the tubular carrier upon release, ensuring complete and reliable deployment rather than relying on passive detachment
Solution Approach 2:
A control wire runs through the tubular carrier and couples the proximal and distal ends, serving as an intermediary mechanism to transmit force and enable both compression during delivery and active separation during release, thereby ensuring reliable deployment
3Reliability
If complex and expensive detachment systems are used, then deployment reliability improves, but manufacturing cost increases
Solution Approach 1:
The system uses a disposable tubular carrier with integrated compressible sections made from cost-effective materials that can be sterilized and disposed of after single use, providing reliable deployment without the need for expensive reusable complex mechanisms
Solution Approach 2:
The delivery function and detachment function are merged into a single integrated tubular carrier structure with built-in compressible sections, eliminating the need for separate complex detachment mechanisms and reducing manufacturing costs while maintaining reliability
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
Ensures reliable and rapid deployment of implantable medical devices with minimal trauma to surrounding tissue, facilitating treatment of previously inoperable blood vessels by providing a simple, cost-effective, and efficient detachment mechanism.
Implementation Method 1
a compressible portion of the distal tube itself axially movable from a compressed condition to an elongated condition
Data Source
AI summary
A method of constructing a detachment system for delivering an implantable medical device to a target location of a body vessel is presented. The method includes forming a compressible portion on a distal tube, engaging an implantable medical device with an engagement system, extending the engagement system through the distal tube such that the implantable medical device is distal of a distal end of the distal tube, applying a force to the engagement system to compress the compressible portion to a compressed state, fixing the engagement system to the distal tube to maintain the compressed state of the compressible portion, and joining a proximal end of the distal tube to a distal end of a proximal tube. The engagement system can include a loop wire that is fixed to the distal tube and engages the medical device.