Electrode Tip Injection Grooves to Prevent Tissue Coring

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Solution Overview

Problem

Existing puncturing devices can cause a coring phenomenon where tissue remains in the hole formed by the electrode tip, leading to serious side effects such as stroke when used with radio frequency (RF).

Innovation Solution

A medical device with an electrode tip featuring radial inward injection grooves and a guide part to direct fluid flow, combined with a pressure control unit, prevents tissue coring by injecting fluid through the tube's hollow without forming a hole at the electrode tip contact point, and allows adjustable fluid injection paths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a hole is formed at the electrode tip to enable fluid injection, then fluid injection capability is improved, but tissue coring phenomenon occurs during RF puncturing

Engineering Contradiction:

Improvefluid injection capabilityVSAvoidtissue coring phenomenon

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The electrode tip is segmented into multiple functional zones: a contact surface for RF puncturing and radial injection grooves for fluid delivery. This segmentation allows the electrode to perform both puncturing and fluid injection functions simultaneously without compromising tissue safety, as the grooves direct fluid away from the contact surface.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Injection grooves act as intermediary channels that communicate with the tube hollow to deliver fluid. These grooves serve as a mediator between the fluid source and the tissue interface, enabling fluid injection while preventing direct hole formation at the electrode contact surface that would cause tissue coring.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If fluid injection is performed through the electrode tip, then fluid delivery is enabled, but high pressure is required for injection

Engineering Contradiction:

Improvefluid injection functionVSAvoidinjection pressure

Core Design Contradiction:

Adaptability or versatilityVSStress or pressure

Solution Approach 1:

The injection grooves are oriented radially inward from the electrode tip toward the tube hollow, creating a three-dimensional fluid delivery path. This radial orientation allows fluid to be delivered along the electrode surface rather than through a perpendicular hole, reducing resistance and required injection pressure.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Device complexity

If the electrode tip contact surface is used for both puncturing and fluid injection, then device simplicity is maintained, but tissue coring occurs

Engineering Contradiction:

Improveelectrode structureVSAvoidtissue retention

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

Different regions of the electrode tip are assigned different functions: the contact surface maintains its puncturing function while radial injection grooves are added to provide fluid delivery. This local differentiation of function allows the electrode to avoid tissue coring by separating the puncturing and injection pathways while maintaining overall structural simplicity.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12533487B2Medical device for puncturing

Publication Date: 2026.01.27 STARMED CO LTD

AI summary

A medical device includes a tube through which fluid flows; a handle part that is coupled to a proximal end portion of the tube; an electrode tip that is coupled to a distal end portion of the tube; and a fluid injection unit that injects fluid into the tube, in which the electrode tip is formed with one or more injection grooves that communicate with a hollow of the tube to inject the fluid.