Evertable Sleeve Delivery System for Intraluminal Device Deployment

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Solution Overview

Problem

The existing delivery systems for intraluminal medical devices face challenges with excessive friction between the devices and the sheath, which can cause damage to the devices, particularly for self-expandable devices that rely on the sheath for compression, leading to performance issues during deployment.

Innovation Solution

A delivery system with an evertable sleeve attached to the inner member and tubular member, which reduces friction by positioning the sleeve between the intraluminal medical device and the tubular member, allowing the sleeve to form rolling bends and be retracted independently, thereby minimizing contact and damage during deployment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional delivery system with a sheath is used to maintain the intraluminal medical device in a compressed state, then the device can be navigated through body vessels, but excessive friction occurs between the device and the sheath causing damage to the device

Engineering Contradiction:

Improvedevice integrityVSAvoidfriction damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A lubricious coating is applied to the inner surface of the sheath to act as an intermediary layer between the intraluminal medical device and the sheath. This coating reduces friction and prevents direct contact damage to the device while maintaining the sheath's constraining function for device compression during navigation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The inner surface properties of the sheath are modified by applying a lubricious coating that changes the friction parameters. This coating reduces the coefficient of friction between the sheath and device, allowing smooth relative movement during deployment while the sheath maintains its constraining force.

Inventive Principle:

Principle #35Parameter changes

2Stability of the object's composition

If the sheath provides constraining force to maintain the device in compressed configuration, then the device remains stable during navigation, but friction during relative movement causes damage to the device

Engineering Contradiction:

Improvecompressed configuration stabilityVSAvoidfriction damage

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The lubricious coating on the sheath inner surface serves as a mediator that allows the sheath to maintain constraining force on the device while reducing friction during relative movement. The coating enables the device to slide smoothly within the sheath during deployment without damaging the device structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If relative movement between the dilator and sheath is used for device deployment, then the device can be delivered to the treatment point, but friction causes damage to the graft or other material attached to the support frame

Engineering Contradiction:

Improvedevice deploymentVSAvoidgraft damage

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The lubricious coating on the sheath inner surface acts as a protective intermediary during the deployment process. It reduces friction between the device components (including attached graft or material) and the sheath, allowing smooth relative movement and deployment while preventing damage to the attached materials.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Reliability

If a tacky valve or valve component is used, then the valve function is improved, but additional challenges occur during loading and deployment due to increased friction

Engineering Contradiction:

Improvevalve functionVSAvoidloading and deployment

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The lubricious coating on the sheath inner surface provides a low-friction interface that facilitates loading and deployment of tacky valve components. The coating acts as a mediator that reduces the adhesive friction between the tacky valve material and the sheath, allowing smooth movement while maintaining the valve's functional properties.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS8366761B2Delivery system with medical device release by evertable sleeve

Publication Date: 2013.02.05 COOK MEDICAL TECHNOLOGIES LLC

AI summary

A medical device delivery system has a tubular member defining a passageway and an inner member slideably disposed within the passageway. An expandable intraluminal medical device is disposed on a chamber of the inner member, and an evertable sleeve is attached to the inner member proximal to the chamber and to an inner surface of the tubular member. Relative movement between the tubular and outer members moves the evertable sleeve from a first position substantially overlying the expandable intraluminal medical device to a second position substantially proximal to the chamber.