Tensioned Membrane Counter Support for Electrosurgical Cutting

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Solution Overview

Problem

Existing electrosurgical instruments face challenges in miniaturization, manufacturing reliability, and accuracy, particularly in the design of coagulation and cutting instruments with elastic counter supports.

Innovation Solution

A cutting electrode is integrated with an elastic counter support held in a frame via a tension-resistant connection, ensuring the counter support remains flexible and uniformly presses tissue against the electrode without mechanical squeezing, using a substance bond or form-fit connection, and is manufactured through injection molding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the counter support is made rigid to provide stable support, then structural stability is improved, but the ability to dodge the intruding cutting electrode and adapt to tissue is reduced

Engineering Contradiction:

Improvestructural stabilityVSAvoidability to dodge cutting electrode

Core Design Contradiction:

Stability of the object's compositionVSAdaptability or versatility

Solution Approach 1:

The counter support is designed as a thin-walled hollow structure that functions as a flexible membrane. This allows the counter support to deform and dodge the intruding cutting electrode while maintaining structural integrity. The hollow cross-section provides flexibility similar to a membrane, enabling adaptation to tissue contours and cutting electrode movement.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The counter support combines multiple materials with complementary properties: an electrically insulating material (such as PTFE or polyimide) for electrical isolation, and a metallic reinforcement structure (stiffening ribs or frame) for mechanical stability. This composite construction achieves both flexibility for dodging the cutting electrode and rigidity for stable tissue support.

Inventive Principle:

Principle #40Composite materials

2Strength

If the counter support is made thick and massive to provide stable support, then structural strength is improved, but manufacturing precision and miniaturization are compromised

Engineering Contradiction:

Improvestructural strengthVSAvoidminiaturization capability

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The counter support utilizes thin-walled hollow structures instead of massive solid forms. The hollow cross-section with thin walls provides sufficient structural strength while enabling precise miniaturization. This thin-walled design allows the counter support to be manufactured with high precision using techniques like injection molding, achieving small dimensions without sacrificing strength.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The combination of electrically insulating materials (PTFE, polyimide) with metallic reinforcement structures creates a composite counter support that achieves high strength-to-weight ratio. This allows miniaturization while maintaining structural integrity, as the metallic ribs provide strength without requiring thick solid material.

Inventive Principle:

Principle #40Composite materials

3Adaptability or versatility

If the counter support is made flexible to adapt to tissue, then adaptability is improved, but manufacturing reliability and structural stability are reduced

Engineering Contradiction:

Improveflexibility for tissue adaptationVSAvoidmanufacturing reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The hollow cross-section design creates a counter support that behaves like a flexible membrane, allowing easy adaptation to tissue contours and cutting electrode movement. The thin-walled structure provides inherent flexibility while maintaining structural coherence, enabling reliable manufacturing through standard injection molding processes.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The composite construction combining electrically insulating materials with metallic reinforcement structures provides both flexibility and manufacturing reliability. The metallic ribs or frame elements ensure structural stability and consistent positioning, while the insulating material provides flexibility and electrical isolation, resulting in a reliably manufacturable component with consistent performance.

Inventive Principle:

Principle #40Composite materials

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 solution ensures soft and uniform electrical cutting of tissue, maintaining manufacturing precision and enabling miniaturization while avoiding mechanical trauma, applicable in both large and miniaturized instruments.

Implementation Method 1

an elastic counter support (22) held in a frame (25)

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12551267B2Cutting instrument

Publication Date: 2026.02.17 ERBE ELEKTROMEDIZIN GMBH

AI summary

An instrument (10) that is usable for tissue fusion and cutting includes a counter support (22) configured as a thin membrane that is assigned to a cutting electrode (17) arranged between two electrode pairs. The thin membrane is spanned in a frame (25) on which it is held with its circumferential surface in a substance bond manner. The circumferential surface thereby extends in an angle, preferably in a right angle, relative to the coagulation electrodes (28, 29) formed by the frame top side. The pressing force applied by the membrane with which biological tissue (32) is pressed against cutting electrode (17) is thus predominantly created by the tensile stress present in the membrane.