Mechanical Detachment Wire for Embolic Coil Delivery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current embolic coil detachment systems in vascular occlusion devices face challenges with reliability, speed, convenience, and the length/stiffness of distal sections, particularly due to time-consuming electrolytic processes and the need for high-pressure or battery-operated mechanisms.
Innovation Solution
A mechanical detachment system for embolic coils featuring a delivery tube with a lumen and a detachable wire having a terminating feature, where at least one stretch-resistant member is secured within the coil lumen, allowing for quick and reliable release by pulling the wire with a predetermined force to sever at a mechanically weakened section or through a friction fit, without the need for electrolysis or high pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrolytic detachment is used to release the embolic coil from the delivery system, then the coil can be detached, but the process is time-consuming and reduces productivity
Solution Approach 1:
The patent replaces the electrolytic detachment mechanism with a purely mechanical detachment system. A detachable wire with a mechanically weakened section (such as a reduced cross-section or pre-formed fracture point) allows the wire to be pulled and severed mechanically, eliminating the need for electrolytic processes. This mechanical approach enables faster detachment while maintaining reliability through the controlled weakness point in the wire structure.
2Stability of the object's composition
If a stretch-resistant member is added to prevent coil stretching, then coil integrity is improved, but the device complexity increases
Solution Approach 1:
The stretch-resistant member is nested within the lumen of the embolic coil, with its ends secured to the coil structure. This nested configuration provides stretch resistance without adding external complexity to the delivery system. The member is contained within the coil's own space, utilizing the existing structural envelope rather than requiring additional external components.
3Device complexity
If the delivery tube distal end is retained by physical friction fit rather than attachment, then the detachment mechanism is simplified, but the retention reliability during delivery may be reduced
Solution Approach 1:
The delivery tube distal end is retained by the detachable wire through physical friction fit at a specific location, rather than through a comprehensive attachment mechanism. This localized friction fit provides sufficient retention during delivery while allowing for simple mechanical detachment when needed. The friction fit is concentrated at the interaction point between the wire and tube end, rather than distributed throughout the structure.
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 system provides a simpler, more reliable, and quicker detachment method with shorter stiff sections, reducing the risk of coil entanglement and improving the precision and efficiency of embolic coil placement within blood vessels.
Implementation Method 1
sever at a mechanically weakened section
Implementation Method 2
retained by the wire physically against without being attached in any way to the proximal junction
Data Source
Figure 1A~1C
Figure 2A~2C
Figure 2D~2E
AI summary
A delivery system for an embolic coil including a delivery tube having a lumen. A proximal coil junction is disposed between the delivery tube and the embolic coil. Insertable through the lumen and extending proximally beyond the proximal end of the delivery tube is a detachable wire with a terminating feature disposed on its distal end. At least one stretch resistant member is disposed within a lumen formed by the embolic coil. A distal end of each of the at least one stretch resistant members is secured to a distal end of the embolic coil, while each of the at least one stretch resistant members is also secured proximate the proximal end of the embolic coil. The distal end of the delivery tube is retained by the wire physically against without being attached in any way to the proximal junction.