Torqueable Stent Delivery Wire for Low-Friction Cerebral Navigation

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional stent delivery systems face challenges in navigating the tortuous cerebral vasculature due to the need for excessive force and friction, especially when delivering stents with larger diameters or higher radial force, making advancement and retraction difficult.

Innovation Solution

An endovascular system with a delivery device that utilizes a distal and proximal coupling feature to apply radial forces, allowing the stent to be pulled in the direction of intended movement, reducing static friction by slightly contracting the stent diameter during advancement and retraction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If conventional delivery systems are used to deliver stents with larger diameters or higher radial force, then the stent can provide sufficient radial force and expanded diameter, but excessive force and friction are required for advancement and retraction

Engineering Contradiction:

Improveradial forceVSAvoidforce required for advancement

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The delivery device applies a pulling force to the stent in advance during the delivery process. The coupler engages with the stent and applies radial force to contract it slightly before advancement, reducing friction and enabling smoother delivery through the vasculature.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention changes the physical state of the stent by applying radial force through the coupler to temporarily contract the stent diameter. This parameter change reduces the contact area and friction between the stent and the delivery system, facilitating easier advancement and retraction.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional delivery systems push the stent for advancement, then the stent can be delivered, but excessive force is required and retraction becomes difficult

Engineering Contradiction:

Improvedelivery efficiencyVSAvoidforce required for retraction

Core Design Contradiction:

ProductivityVSForce

Solution Approach 1:

Instead of pushing the stent for advancement using conventional methods, the invention uses a pulling force applied through the coupler. This inverted approach reduces the force required for both advancement and retraction, as the pulling mechanism engages the stent and draws it through the vasculature more efficiently.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The coupler applies radial force to the stent in advance, contracting it slightly before the pulling action begins. This preliminary action reduces friction and enables smoother advancement and retraction, improving overall delivery efficiency while reducing the force required for retraction.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If the stent is compressed in the catheter for delivery, then it can be delivered through the vasculature, but high friction is experienced during movement

Engineering Contradiction:

Improvefriction during deliveryVSAvoidforce required for movement

Core Design Contradiction:

Ease of operationVSForce

Solution Approach 1:

The coupler applies radial force to the stent, changing its physical state by temporarily contracting the stent diameter. This parameter change reduces the contact area and friction between the stent and the delivery system, facilitating easier movement through the vasculature with reduced force requirements.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The delivery device applies a pulling force through the coupler in advance during the delivery process. This preliminary action contracts the stent and reduces friction before the main movement occurs, enabling smoother navigation through the vasculature with reduced force requirements.

Inventive Principle:

Principle #10Preliminary action

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The system reduces the force required for stent delivery by minimizing friction, enabling smoother navigation through complex vasculature and facilitating efficient advancement and retraction of stents.

Implementation Method 1

The coupler is configured to contact and apply an outwardly radial force to a distal end portion of the tubular implant in the lumen of the catheter to grip the tubular implant in the lumen of the catheter

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

The proximal stopper of the first set is configured to engage the first coupler when the delivery wire is advanced to apply a translating force in a distal direction to the first coupler thereby generating a pulling force in the distal direction on a portion of the tubular implant

Methodology Applied

Scientific EffectMechanical Force: Mechanical Force

Data Source

PatentUS20250345194A1Flow diverting stent delivery system including a torqueable wire

Publication Date: 2025.11.13 DEEPIN TECH LLC

AI summary

An endovascular system includes a delivery device operable to deliver a tubular implant through a catheter. The delivery device comprises a delivery wire, a set of stoppers comprising a distal stopper and a proximal stopper fixedly attached to the delivery wire, a coupler disposed between the distal stopper and the proximal stopper, and a protection cover wrapping at least an end portion of the tubular implant. A method of delivering a tubular implant is also described.