Nested Intraluminal Delivery Device with Radiopaque Markers
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Solution Overview
Problem
Current stent and stent delivery systems have limitations in effectively treating atherosclerotic occlusive disease, particularly in providing precise and efficient deployment of intraluminal devices like stents and tacks within the vascular system.
Innovation Solution
A delivery device with a unique shape, featuring a sleeve of flexible material surrounding a harder inner shaft and annular pusher bands, allows for sequential deployment of intraluminal devices by aligning radiopaque markers for precise placement and using a post-dilation deployment device to ensure proper expansion and seating of the devices within the vessel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If multiple intraluminal devices are delivered sequentially from a single delivery device, then procedure time and foreign material are reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple intraluminal devices are nested within individual delivery platforms, which are in turn nested within a single delivery device. Each delivery platform contains a compressed intraluminal device surrounded by a sleeve and positioned between annular pusher bands. This nested configuration allows sequential deployment of multiple devices through a single access point, reducing procedure time and the number of foreign objects introduced into the patient's body.
Solution Approach 2:
The delivery device is segmented into multiple distinct delivery platforms, each capable of independently holding and deploying an intraluminal device. Each platform includes radiopaque markers for positioning, a sleeve for containment, and annular pusher bands for deployment. This segmentation allows controlled sequential deployment while maintaining manageable complexity through modular design.
2Manufacturing precision
If radiopaque markers are aligned for precise device placement, then manufacturing precision and deployment accuracy improve, but device complexity increases
Solution Approach 1:
Radiopaque markers are incorporated into each delivery platform and intraluminal device, allowing visualization and alignment under fluoroscopic imaging. These markers appear as distinct radiopaque features that can be aligned with anatomical landmarks or pre-marked positions, enabling precise deployment without requiring complex positioning mechanisms.
3Ease of operation
If a sleeve of flexible material surrounds a harder inner shaft, then ease of operation and device delivery improve, but manufacturing complexity increases
Solution Approach 1:
The delivery device employs a composite construction where a flexible sleeve material surrounds a harder inner shaft. The flexible sleeve allows the device to navigate tortuous vasculature and conform to vessel geometry, while the harder inner shaft provides structural support and maintains delivery platform positioning. This composite approach balances flexibility and rigidity to improve deliverability.
4Reliability
If annular pusher bands are used to deploy intraluminal devices, then deployment reliability improves, but device complexity increases
Solution Approach 1:
The annular pusher bands are designed to automatically deploy the intraluminal device when the outer sheath is retracted. The pusher bands are positioned between the delivery platform and the outer sheath, and as the sheath is pulled back, the pusher bands are exposed and their elastic memory causes them to expand, pushing the compressed intraluminal device against the vessel wall for deployment. This self-service mechanism eliminates the need for additional actuation systems.
Data Source
AI summary
A delivery device can provide sequential delivery of a plurality of intraluminal devices or tacks held in a compressed state on the delivery device. Delivery platforms on the delivery device can hold a tack in a compressed position and be positioned between annular pusher bands that may also be radiopaque markers. The annular pusher bands can be made of wire or sections of material to increase flexibility while remaining radiopacity. A post deployment dilation device can be included. The post deployment dilation device can be a plurality of expansion filaments, a bellows, or a balloon. A tack deployment method can include allowing a self-expanding tack to expand, aligning the post deployment dilation device under the tack, and causing the post deployment dilation device to expand radial to push outward on the tack.