Vaso-occlusive Coil Delivery Adapter for Precise Detachment
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Solution Overview
Problem
Current vaso-occlusive delivery systems face challenges with a stiff junction between the delivery wire and occlusive coil, leading to inaccurate placement and variability in detachment times, and require a separate external ground electrode, which can cause discomfort and introduce variability in detachment times.
Innovation Solution
A delivery system with a delivery wire adapter that secures the occlusive coil using open pitched windings and a sacrificial detachment region, allowing for electrolytic or thermal detachment without a separate ground electrode, utilizing a bipolar conductive path within the delivery wire assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a stiff junction between delivery wire and occlusive coil is used, then the structural strength is improved, but the placement accuracy deteriorates due to kick-back motion
Solution Approach 1:
The junction is divided into multiple segments: delivery wire, adapter, and occlusive coil, each with distinct functional properties. The adapter acts as an intermediate segment that decouples the stiffness of the delivery wire from the flexibility needed for coil deployment, allowing the delivery wire to maintain structural strength while the coil can be accurately positioned without kick-back motion.
Solution Approach 2:
An adapter component is introduced as an intermediary between the delivery wire and occlusive coil. This adapter reduces the overall stiffness of the junction while maintaining sufficient structural strength, thereby eliminating kick-back motion during coil release and improving placement accuracy without compromising the strength of the connection.
2Reliability
If a separate ground electrode is used for electrolytic detachment, then the detachment function is achieved, but patient comfort deteriorates due to discomfort or pain
Solution Approach 1:
The ground electrode function is merged with the delivery wire assembly itself. The delivery wire assembly includes both the active electrode for electrolytic detachment and the ground electrode, eliminating the need for a separate ground electrode that would require external placement on the patient's body. This integration removes the source of patient discomfort while maintaining the electrolytic detachment function.
Solution Approach 2:
The delivery wire assembly serves dual functions: it delivers the occlusive coil and provides the electrical circuit for electrolytic detachment. By incorporating the ground electrode within the delivery wire assembly, the system becomes self-sufficient, eliminating the need for separate external electrodes and associated patient discomfort.
3Strength
If a long and stiff junction is used, then the structural strength is improved, but the detachment time consistency deteriorates due to variability
Solution Approach 1:
The junction is segmented into distinct components with optimized properties. The adapter segment provides a controlled interface that ensures consistent electrical contact for detachment while maintaining structural strength. This segmentation allows for predictable and consistent detachment times across multiple procedures.
Solution Approach 2:
The physical and electrical parameters of the junction are optimized through the adapter design. By controlling the dimensions, material properties, and electrical conductivity of the adapter, the system achieves consistent electrical contact for reliable electrolytic detachment while maintaining sufficient structural strength, thereby improving detachment time consistency.
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 reduces the length and stiffness of the junction between the delivery wire and occlusive coil, ensuring consistent and precise detachment without kick-back motion and eliminating the need for a separate ground electrode, thereby improving placement accuracy and reducing patient discomfort.
Implementation Method 1
The sacrificial detachment region may break or otherwise dissolve in response to electrical energy (e.g., electrolytic detachment region)
Implementation Method 2
The sacrificial detachment region may break or otherwise dissolve in response to electrical energy (e.g., electrolytic detachment region) or thermal energy (e.g., thermal detachment region)
Data Source
AI summary
An occlusive coil delivery device includes an occlusive coil having a plurality of open pitched windings at a proximal end thereof, and a delivery wire assembly having a proximal tubular portion, a distal coil portion and a lumen, and a delivery wire adapter having a proximal end and a distal end. The delivery wire assembly having a delivery wire forming a first conductive path and extending through the lumen from a proximal end of the delivery wire assembly to a location distal of the distal coil portion, and a second conductive path formed by the proximal tubular portion and distal coil portion. The distal end of the adapter comprising a plurality of fingers configured to interface between adjacent open pitched windings of the proximal end of the occlusive coil, with the proximal end of the delivery wire adapter secured to a distal portion of the delivery wire.