Micro-coil Detachment Mechanism Using Lost Motion Coupling
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Solution Overview
Problem
Existing micro-coil delivery systems for cerebral aneurysms often result in inadvertent detachment of the micro-coil from the delivery pusher, posing a risk during treatment.
Innovation Solution
A delivery device with a retention and detachment mechanism featuring two elongate members, where the first elongate member transitions the mechanism from a locked to an unlocked configuration, allowing controlled release of the micro-coil using a lost motion coupling mechanism, ensuring reliable placement within the vascular disorder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a mechanical detachment system uses a single elongate member to hold the micro-coil, then the device complexity is reduced, but the reliability of retention increases the risk of inadvertent release
Solution Approach 1:
The retention mechanism is divided into two separate elongate members: a first elongate member that engages with the micro-coil for retention, and a second elongate member that acts as a detachment trigger. This segmentation allows each member to have specialized functionality - the first member provides reliable retention while the second member controls detachment, preventing inadvertent release while maintaining manageable device complexity through functional separation.
2Ease of operation
If a power supply or mechanical handle is attached to the proximal end of the delivery pusher for detachment, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The detachment mechanism is merged into the delivery pusher structure itself rather than being a separate attached component. The second elongate member is integrated within the delivery pusher, allowing the operator to control detachment through simple manipulation of the delivery pusher's existing structure. This merging eliminates the need for separate power supplies or handles, reducing overall device complexity while maintaining ease of operation through the unified design.
3Reliability
If the micro-coil is securely locked to the delivery pusher, then the reliability of delivery is improved, but the ease of detachment becomes more difficult
Solution Approach 1:
The system is designed with pre-positioned elongate members that are ready to engage and disengage at the appropriate moments. The first elongate member is pre-configured to securely lock the micro-coil during delivery, while the second elongate member is pre-positioned to trigger detachment when needed. This preliminary arrangement ensures reliable locking during delivery while enabling easy detachment through simple activation of the pre-positioned second member, eliminating the need for complex detachment procedures.
Data Source
AI summary
A device for delivering an implant (e.g., an embolic micro-coil) to a vascular disorder of a patient includes a delivery pusher, a moveable element, and first and second elongate members. The delivery pusher defines a lumen between its proximal and distal ends. The moveable element (e.g., a floating tube or a floating coil) defines a passageway therethrough and is disposed within the lumen of the delivery pusher. The first and second elongate members (e.g., core wires) are also disposed within the lumen of the delivery pusher. A portion of each elongate member passes through the passageway of the moveable element. Movement of the first elongate member in a first direction (e.g., retraction of the first elongate member from a locked to an unlocked configuration) causes a time-delayed or lost motion movement of the second elongate member in the same (i.e., first) direction, which releases the implant from the delivery pusher.