Wire Expansion Body Structure for Through-Hole Enlargement

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Solution Overview

Problem

Existing medical devices used for shunt treatment in chronic heart failure face issues with torsion of wires in the expansion body, leading to inadequate transmission of expansion force to biological tissue and uncertainty in confirming hemodynamic effects due to blocked through-holes.

Innovation Solution

A medical device with an elongated shaft and an expansion body featuring wire portions arranged circumferentially, equipped with torsion restriction mechanisms such as bifurcated lines and merging portions, suppresses torsion during expansion, allowing for controlled enlargement of through-holes and maintenance treatments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the expansion body is formed using wires to enable blood flow, then hemodynamics can be confirmed during expansion, but the wires may have torsion in circumferential direction causing insufficient expansion force transmission

Engineering Contradiction:

Improvehemodynamics confirmationVSAvoidexpansion force transmission

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The expansion body is divided into multiple wire portions arranged in the circumferential direction, with each wire portion being independently configurable. This segmentation allows blood to flow between wire portions for hemodynamics confirmation while reducing torsion effects through distributed wire structures rather than a single continuous wire

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the wire portions have different properties - the wires are configured to be flexible in the axial direction for expansion while being constrained in the circumferential direction to prevent torsion. This local quality differentiation enables simultaneous hemodynamics confirmation and sufficient expansion force transmission

Inventive Principle:

Principle #3Local quality

2Shape

If a balloon is used to enlarge the through-hole, then the through-hole can be maintained, but the balloon blocks the through-hole preventing hemodynamics confirmation

Engineering Contradiction:

Improvethrough-hole maintenanceVSAvoidhemodynamics confirmation

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The patent replaces the solid balloon shell with wire portions that form a mesh-like structure. This flexible wire structure maintains the through-hole opening while allowing blood flow between the wires, enabling simultaneous hole maintenance and hemodynamics confirmation

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The expansion body is designed as a porous structure with gaps between wire portions, allowing blood to pass through while the overall structure maintains the through-hole. This porous configuration enables hemodynamics confirmation during the expansion process

Inventive Principle:

Principle #31Porous materials

Data Source

PatentUS12533180B2Medical device

Publication Date: 2026.01.27 TERUMO KK

AI summary

A medical device is disclosed which can suppress torsion of a wire in a circumferential direction in an expansion body formed using the wire. A medical device is disclosed, which enlarges a biological tissue. The medical device includes an elongated shaft portion and an expansion body disposed in a distal portion of the shaft portion. The expansion body has a wire portion configured to expand and contract in a radial direction, and a torsion restriction portion that restricts movement of the wire portion in a circumferential direction of the expansion body.