Bionic Organ Vascular Graft Connection Stent

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Solution Overview

Problem

Current methods for connecting bionic organs to vascular grafts lack a reliable and permanent solution under ex vivo conditions, with existing stents often requiring complex procedures and not ensuring a secure, long-lasting attachment.

Innovation Solution

A system comprising a self-expanding stent housed in a casing with a breakable mandrel tip, allowing for precise placement and expansion within the vascular graft, which is then securely fixed to the bionic organ using loops and samplers to match varying diameters, ensuring a tight and permanent connection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a self-expanding stent is used to connect bionic organ to vascular graft, then the connection reliability is improved, but the device complexity increases due to the need for casing and mandrel with breakable tip

Engineering Contradiction:

Improveconnection reliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The stent is nested within a casing that is itself nested within a mandrel structure. The stent is compressed inside the casing, which is held open by the mandrel with a breakable tip. This nested arrangement allows the complex self-expanding stent mechanism to be delivered through a relatively simple catheter-like structure, reducing the overall device complexity while maintaining connection reliability.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The stent is pre-compressed and pre-positioned within the casing before insertion. The mandrel with breakable tip is prepared in advance to facilitate smooth insertion and then deliberately broken at a predetermined point to trigger stent expansion. This preliminary preparation ensures reliable connection while simplifying the actual implantation procedure.

Inventive Principle:

Principle #10Preliminary action

2Strength

If the stent is expanded to match vascular port diameter, then the connection strength is improved, but the risk of damage to bionic organ increases

Engineering Contradiction:

Improveconnection strengthVSAvoiddamage risk

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The breakable tip of the mandrel acts as a cushioning element that breaks at a predetermined force threshold. This prevents excessive force from being transmitted to the bionic organ during stent expansion. The tip absorbs the initial expansion stress and fails safely before damaging the delicate bionic organ tissue, while still allowing sufficient expansion force to achieve strong connection.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The mandrel tip is designed with localized breakable characteristics at its distal end, while the rest of the mandrel structure remains strong and rigid for proper stent positioning. This local differentiation allows the system to provide both strong connection capability and protected expansion that prevents damage to the bionic organ.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If loops and samplers are used to match varying diameters, then the adaptability is improved, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvediameter adaptabilityVSAvoidsampler precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The system provides adaptability to various vascular port diameters by offering a set of samplers with different predetermined diameter parameters. Each sampler is manufactured with a specific diameter parameter that corresponds to different anatomical variations. This allows the system to adapt to different patients and anatomical conditions while maintaining reasonable manufacturing precision for each individual sampler component.

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 system provides a fast, secure, and permanent connection between the bionic organ and vascular graft, capable of withstanding pressures up to 180 mmHg, with the stent expanding to match the vascular port diameter, ensuring durability and preventing stenosis.

Implementation Method 1

a self-expanding stent... wherein the diameter of the stent is selected such that, in the compressed state, the diameter of the stent is less than diameter of the vascular graft and, when expanded, the diameter of the stent is greater than or equal to diameter of the vascular port in the bionic organ

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

a mandrel with a breakable tip, wherein, in an assembled state of the system, the stent in a compressed state is placed in the casing, which casing holds the stent in a compressed state until the stent is removed from the casing

Methodology Applied

Scientific EffectFracture Mechanics: Fracture Mechanics

Data Source

PatentUS20240299156A1A system for connecting a bionic organ to a vascular graft and a method of connecting a bionic organ to a vascular graft

Publication Date: 2024.09.12 POLBIONICA SP Z O O

AI summary

The invention relates to a system for connecting a bionic organ to a vascular graft and a method for connecting a bionic organ to a vascular graft under ex vivo conditions. Once connected, the vascular graft is situated within the bionic organ, and the stent is situated internally to the vascular graft and the bionic organ.