Medical Drainage Stent Radial Extension Portion for Position Control

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Solution Overview

Problem

Existing medical drainage stents are prone to falling into the abdominal cavity during release due to lack of precise control and are difficult to retrieve, increasing surgical difficulty and risk.

Innovation Solution

A medical drainage stent with a proximal end extension portion that protrudes radially and has a free end for fixation, reducing the risk of falling and facilitating retrieval, combined with a flexible portion for adapting to different tissue sizes and reducing tissue stimulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a metal stent is used for inter-tissue anastomotic drainage, then drainage function is achieved, but the stent may fall into the abdominal cavity during release due to lack of precise control

Engineering Contradiction:

Improvestent position controlVSAvoidrelease operation difficulty

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The stent is divided into multiple segments including a drainage section, proximal end section with extension portion, and distal end section. The extension portion can be independently controlled during release, allowing precise positioning of the drainage section while preventing the stent from falling into the abdominal cavity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The extension portion at the proximal end acts as an intermediary structure that provides a grasping point for surgical instruments. This intermediary element enables precise control during release operations and facilitates easy retrieval if needed, without interfering with the drainage function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If an existing stent with flange structure is used, then connection stability is enhanced, but the stent becomes difficult to retrieve after falling into the abdominal cavity

Engineering Contradiction:

Improvestent connection stabilityVSAvoidstent retrieval difficulty

Core Design Contradiction:

Stability of the object's compositionVSEase of repair

Solution Approach 1:

Instead of using a flange structure that prevents retrieval, the invention uses an extension portion that protrudes from the stent body. This inverted approach provides both stability during use and ease of retrieval, as the extension portion can be easily grasped by surgical instruments to pull the stent back if needed.

Inventive Principle:

Principle #13The other way round (Inversion)

3Manufacturing precision

If a stent is designed with precise control features, then position control during release is improved, but the manufacturing process becomes more complicated

Engineering Contradiction:

Improvestent position control precisionVSAvoidmanufacturing process complexity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The stent has different structural characteristics in different sections: the proximal end section has an extension portion for precise control, the middle section has the drainage function, and the distal end section has anchoring features. This local differentiation allows precise positioning without complicating the entire manufacturing process.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The extension portion's dimensions, shape, and material properties can be adjusted as parameters to achieve precise control during release. By optimizing these parameters rather than changing the overall stent design, manufacturing precision is improved without significantly increasing process complexity.

Inventive Principle:

Principle #35Parameter changes

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 stent design enhances control and stability during release, reduces the risk of falling into the abdominal cavity, and simplifies retrieval, thereby decreasing surgical complexity and risk while ensuring biocompatibility and ease of use.

Implementation Method 1

the stent is made of metal wires with good biocompatibility (such as nickel-titanium memory alloy wires)

Methodology Applied

Scientific EffectShape memory alloy: Shape Memory Alloy

Implementation Method 2

the extension portion has extraction force, enabling the fixing of the stent

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS20220134067A1Medical drainage stent

Publication Date: 2022.05.05 MICRO-TECH (NANJING) CO LTD

AI summary

A medical drainage stent that includes a stent body, and a proximal portion and a distal portion that are located at two ends of the stent body for connecting a first tissue wall and a second tissue wall in a juxtaposing manner. The stent body is fixed between the first tissue wall and the second tissue wall to provide a drainage channel. The proximal portion of the stent has N extension portions, where a fixed end of the extension portion is fixedly connected with an edge of a proximal end of the stent body, and the other end of the extension portion is a free end in a free state. Structures of the N extension portions at least partially protrude from the stent body in a radial direction, so that the proximal portion of the stent is fixed on the first tissue wall, where N is a positive integer.