Vascular Occlusion Delivery with Dual Control Wires
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Solution Overview
Problem
Current vascular occlusion devices, such as embolic coils and metal mesh plugs, face challenges in achieving precise placement, maintaining position, and forming a dense coil pack within blood vessels, leading to potential misplacement and recanalization, which can result in incomplete occlusion and increased procedural time.
Innovation Solution
A delivery apparatus that provides both proximal and distal control of a vascular occlusion device, allowing for precise positioning and compression of coil members during deployment, using retaining features and control wires to maintain the occlusion device's position and form a higher-density coil pack within the vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If embolic coils are sequentially deployed using traditional delivery methods, then the vessel can be occluded, but the placement precision is poor and the procedure time is extended
Solution Approach 1:
The delivery system is segmented into two independent control mechanisms: a proximal control wire attached to the proximal end of the coil pack and a distal control wire attached to the distal end. This segmentation allows independent manipulation of each end, enabling precise positioning and compression control during deployment, thereby improving placement precision while reducing the need for repeated adjustments and contrast imaging.
2Reliability
If embolic coils are pushed through the delivery catheter using a guide wire or pusher, then the coils can be delivered, but the coil pack density is insufficient leading to recanalization
Solution Approach 1:
The delivery system incorporates dynamic control capabilities through two control wires that can independently adjust the position and compression of the coil pack during delivery. The distal control wire can compress the coil pack against the distal retaining feature while the proximal control wire maintains positioning, creating a dynamically adjustable system that optimizes coil pack density to prevent recanalization and ensure reliable occlusion.
3Device complexity
If the occlusion device is deployed without distal control, then the delivery mechanism is simpler, but the device may migrate downstream under blood flow forces
Solution Approach 1:
The invention extracts the distal control function from the traditional single-wire pusher system by introducing a separate distal control wire that is releasably coupled to the distal retaining feature. This extracted distal control mechanism independently counteracts blood flow forces to prevent downstream migration, while the proximal control wire maintains positioning, together ensuring device stability without requiring overly complex integrated control systems.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 3A~3B
AI summary
A delivery apparatus for a lumen occlusion device includes a pusher configured for releasably coupling with and pushing and pulling a proximal end of the occlusion device in a distal or proximal direction and a distal control wire capable of releasably coupling with the distal end and the proximal end of the occlusion device. The control wire may be configured for moving the distal end of the occlusion device in both proximal and distal directions allowing precise simultaneous control of both proximal and distal ends of the occlusion device. Control of both ends provides for placing the occlusion device in tension during delivery through a delivery catheter, thereby reducing delivery forces, achieving greater compaction of the occlusion device in the lumen, and precisely locating both distal and proximal ends of the occlusion device within the lumen.