Perfluorocarbon Liquid Use in Middle Ear Surgery for Blood Isolation

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Solution Overview

Problem

Current otological surgery techniques face challenges in adequately preventing bleeding, holding back tissues, and isolating blood to improve visualization due to the use of air and interference from endoscopes, especially when dealing with middle ear procedures.

Innovation Solution

The use of perfluorocarbon liquids with specific gravity greater than blood to apply positive pressure, isolate blood, and provide clear visualization by being immiscible with blood, allowing for improved surgical access and visualization through their transparency and conformability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If mastoid bone is removed to visualize middle ear, then visualization is improved, but invasiveness increases

Engineering Contradiction:

ImprovevisualizationVSAvoidinvasiveness

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and removes blood from the middle ear surgical field using suction, separating the harmful element (blood obscuring visualization) from the surgical site, allowing clear visualization without requiring invasive mastoid bone removal

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces perfluorocarbon liquid to create an inert fluid environment in the middle ear, displacing air and providing a controlled medium that improves optical clarity and allows better visualization through the ear canal without invasive approaches

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

2Illumination intensity

If endoscope is inserted to visualize middle ear, then visualization is improved, but instrument manipulation is interfered with

Engineering Contradiction:

ImprovevisualizationVSAvoidinstrument manipulation

Core Design Contradiction:

Illumination intensityVSEase of operation

Solution Approach 1:

The patent removes blood from the surgical field using suction, eliminating the obstacle that previously required endoscope insertion for visualization, thereby freeing up instrument manipulation space

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the optical parameters of the middle ear environment by introducing perfluorocarbon liquid, which has different refractive index and optical properties than air or blood, improving visualization without requiring endoscope insertion

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If air is used during surgery, then surgical access is maintained, but bleeding control and tissue retraction are insufficient

Engineering Contradiction:

Improvesurgical accessVSAvoidbleeding control

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies hydraulic principles by introducing perfluorocarbon liquid into the middle ear, using fluid pressure to achieve reliable bleeding control and tissue retraction, overcoming the limitations of using air alone

Inventive Principle:

Principle #29Pneumatics and hydraulics

Solution Approach 2:

The patent changes the physical state of the middle ear environment from gaseous (air) to liquid (perfluorocarbon), utilizing the higher density and pressure transmission properties of liquid to improve bleeding control and tissue retraction reliability

Inventive Principle:

Principle #35Parameter changes

4Reliability

If perfluorocarbon liquid is injected into middle ear, then bleeding control and visualization are improved, but additional fluid management steps are required

Engineering Contradiction:

Improvebleeding controlVSAvoidfluid management

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The perfluorocarbon liquid self-displaces blood from the middle ear due to density differences, and the liquid can be easily removed through the same access point, reducing the need for complex additional management systems

Inventive Principle:

Principle #25Self-service

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

Perfluorocarbon liquids effectively stop bleeding, flatten tissues, and isolate blood, enhancing surgical visualization and access by maintaining clarity and enabling efficient blood removal without disturbing the surgical field.

Implementation Method 1

the perfluorocarbon liquid has a specific gravity greater than blood to apply positive pressure to surrounding tissues

Methodology Applied

Scientific EffectHydrostatic pressure: Pressure Increase

Implementation Method 2

The perfluorocarbon liquid is immiscible with blood for isolating blood in the middle ear from the perfluorocarbon liquid

Methodology Applied

Scientific EffectImmiscibility: Liquid-Liquid Extraction

Data Source

PatentUS12622812B2Otological surgery under perfluorocarbon liquids

Publication Date: 2026.05.12 ALCON INC

AI summary

Certain embodiments described herein provide a method of performing an otological surgical procedure including surgically accessing a middle ear, injecting a perfluorocarbon liquid into the middle ear, and suctioning the isolated blood from the middle ear without removing the perfluorocarbon liquid. The perfluorocarbon liquid is immiscible with blood for isolating blood in the middle ear from the perfluorocarbon liquid. In certain embodiments, the perfluorocarbon liquid has a specific gravity greater than blood to apply positive pressure to surrounding tissues. In certain embodiments, the method includes suctioning the perfluorocarbon liquid from the middle ear after the isolated blood is removed.