Implantable Device Electrolytic Detachment Wire Retraction
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Solution Overview
Problem
The existing methods for implanting medical devices using endovascular techniques often result in a portion of the delivery wire protruding from the implant after detachment, posing a risk to surrounding anatomy due to the lack of retraction capability.
Innovation Solution
The implant is designed to be attached to the delivery wire in a manner that allows the severed distal region of the wire to be retracted into the implant's interior space upon detachment, utilizing an expansion member, such as a spring, and an electrolytically corrodible section to minimize protrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the implant is attached to the delivery wire in a conventional manner, then the implant can be delivered and detached, but a portion of the delivery wire protrudes from the implant after detachment, posing a risk to surrounding anatomy
Solution Approach 1:
The distal region of the delivery wire is retracted into the interior space of the implant after detachment, nesting the wire within the implant structure. This is achieved through the expansion member that pushes the distal region into the implant's interior space, eliminating protrusion and the associated safety risks.
Solution Approach 2:
The harmful protruding portion of the delivery wire is extracted or removed from the external environment by retracting it into the implant's interior space. This extraction eliminates the harmful factor (protrusion) while maintaining the functional integrity of the implant-wire assembly.
2Object-affected harmful factors
If the expansion member is used to retract the distal region of the delivery wire, then wire protrusion is minimized, but the device complexity increases
Solution Approach 1:
The expansion member is self-actuating, utilizing the expansion force generated during implant deployment to automatically retract the distal region of the delivery wire into the implant's interior space. This self-service mechanism eliminates the need for additional active control systems, reducing overall device complexity while achieving the retraction function.
Solution Approach 2:
The expansion member is pre-positioned and pre-loaded during implant fabrication, with its expansion force already configured to perform the retraction action automatically upon implant deployment. This preliminary preparation ensures that the retraction function is integrated into the basic implant structure without adding complex control mechanisms.
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 effectively reduces the extent of wire protrusion after detachment, enhancing safety by ensuring the wire is securely retained within the implant, thereby minimizing the risk of harm to surrounding tissues.
Implementation Method 1
an expansion member located between the proximal end portion and the distal region of the delivery wire, the expansion member being biased to move the distal region of the delivery wire distally
Implementation Method 2
a distal cross-sectional dimension of the distal region is greater than a proximal cross-sectional dimension of the detachment zone... the distal region of the delivery wire comprises an electrolytically corrodible section
Data Source
AI summary
Delivery and detachment of an implant can be enhanced by a retraction mechanism to secure portions of a delivery wire within an interior space of the implant. A delivery system can include an implant having a proximal end portion. A delivery wire can include (i) a detachment zone proximal to the proximal end portion and (ii) a distal region distal to the proximal end portion. An expansion member can be located between the proximal end portion and the distal region of the delivery wire. The expansion member can be biased to move the distal region of the delivery wire distally away from the proximal end portion when severed at the detachment zone.