Braided Enveloper for Low-Force Delivery of Circulatory Devices
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Solution Overview
Problem
Circulatory support devices with polymeric coatings face resistance during delivery through lumens due to their resistive nature, requiring high delivery forces that traditional lubrication methods do not adequately address.
Innovation Solution
A delivery device comprising an enveloper member with a tether assembly that removably covers the deployment portion of the circulatory support device, allowing for reduced delivery forces by conforming to the lumen and facilitating withdrawal, using a braided mesh enveloper member with a securement member to inhibit expansion until deployment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymeric coating is applied to protect underlying components, then protection of the mesh is improved, but resistance to travel through lumens increases
Solution Approach 1:
The patent introduces a delivery device as an intermediary mechanism that temporarily interfaces with the circulatory support device during delivery. This delivery device includes a delivery catheter and a retrieval catheter that work together to facilitate delivery without requiring high forces, thus resolving the contradiction between protective coating and delivery resistance.
Solution Approach 2:
The delivery system employs dynamic mechanisms including expandable and collapsible structures. The delivery catheter can be expanded to engage the circulatory support device and collapsed for retrieval, allowing the system to adapt its mechanical properties during different phases of delivery to minimize required delivery forces.
2Ease of operation
If traditional lubrication methods are used to reduce resistance, then ease of delivery is improved, but effectiveness is insufficient for highly resistive devices
Solution Approach 1:
The delivery device serves as a mechanical intermediary that provides direct engagement and control over the circulatory support device, replacing reliance on lubrication alone. The retrieval catheter with its engagement structure provides mechanical advantage for delivery and retrieval operations.
Solution Approach 2:
The patent replaces chemical lubrication methods with a mechanical delivery system that uses structured engagement, expansion, and contraction mechanisms. This mechanical substitution provides more reliable and controllable delivery effectiveness for highly resistive devices.
Data Source
AI summary
A delivery device for percutaneous medical device is disclosed herein. The delivery device includes an enveloper member that includes an enveloper wall, an enveloper aperture that is formed at the enveloper wall such that the enveloper member is configured to receive a deployment portion of the percutaneous medical device through the enveloper aperture, and a tether assembly extending from the enveloper wall; the enveloper member configured to removably cover the deployment portion with the enveloper wall; and the tether assembly configured to facilitate removal of the enveloper member from covering the deployment portion and to facilitate withdrawal of the enveloper member from a delivery lumen.