Detachable EUS Stent Delivery for Precise Placement and Release

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Solution Overview

Problem

There is a need for alternative medical devices and methods for delivering stents to the biliary and pancreatic tracts, as existing devices have certain advantages and disadvantages.

Innovation Solution

A stent delivery system comprising an elongate tubular member with a needle and a stent on its outer surface, a suture loop for securing the stent, and a handle assembly for controlled deployment and detachment of the stent at the treatment site.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a stent is delivered using a needle and elongate tubular member system, then precise placement in the biliary and pancreatic tracts is achieved, but the risk of damaging surrounding tissue increases

Engineering Contradiction:

Improveplacement precisionVSAvoidtissue damage

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The stent is pre-mounted on the needle and elongate tubular member system before insertion, allowing it to be delivered precisely to the target site in one action. The needle is inserted first to create the access path, followed by advancement of the stent-loaded tubular member through the needle to the precise placement location, minimizing tissue disruption while achieving accurate positioning.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The elongate tubular member acts as an intermediary between the needle and the stent, providing a protective sheath that allows the stent to be advanced through the needle without direct contact that could cause tissue damage. The tubular member controls the deployment timing and location, enabling precise placement while protecting surrounding tissues from the sharp needle and rigid stent structure during insertion.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If a detachable stent system is used, then procedural control and safety are enhanced, but the device complexity increases

Engineering Contradiction:

Improveprocedural controlVSAvoiddevice complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The delivery system is segmented into distinct functional components: a needle for access, an elongate tubular member for stent delivery and protection, and a detachable stent with retention features. This segmentation allows each component to perform its specific function optimally while enabling controlled detachment at the target site, improving procedural control despite the increased number of components.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system transitions from a static assembled state to a dynamic detached state during the procedure. The stent is initially constrained within the tubular member for precise delivery, then dynamically released through controlled detachment mechanisms (such as suture loop release or mechanical disengagement) to deploy the stent at the target site while leaving the delivery system behind, providing procedural control through state transition.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS20250360009A1Detachable stent on eus access device

Publication Date: 2025.11.27 BOSTON SCIENTIFIC SCIMED INC

AI summary

A stent delivery system comprising an elongate tubular member having an outer surface and a lumen formed therein, a needle slidably disposed within the lumen of the elongate tubular member, a stent disposed on an outer surface of the needle distal of the elongate tubular member, and a suture loop attached to the distal end of the elongate member, wherein the suture loop is configured to be inserted through an opening in an outer surface of the stent to circumferentially surround the outer surface of the needle.