Micro-Delivery Pump Electrode Geometry for Efficient Electrolysis

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Solution Overview

Problem

Conventional microelectrode designs in electrolysis pumps suffer from low energy efficiency due to reduced local electrical fields and solid surface free energy, leading to unreliable energy performance and inefficient delivery of therapeutic agents.

Innovation Solution

A micro-delivery device featuring a planar electrode with sharp corners formed through isotropic or anisotropic etching, which enhances the local electrical field and surface energy, improving energy efficiency and fluid delivery.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a smooth microelectrode is used in the electrolysis pump, then the manufacturing process is simple, but the pump energy efficiency is low due to lower local electrical field in electrolyte

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidpump energy efficiency

Core Design Contradiction:

Ease of manufactureVSUse of energy by moving object

Solution Approach 1:

The patent applies local quality by creating sharp corners on the electrode surface through photolithography and etching processes. These sharp corners concentrate the electrical field locally, enhancing the electrical field strength at specific points without requiring complex overall electrode structures. This resolves the contradiction by maintaining manufacturing simplicity while improving energy efficiency through localized field enhancement.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent introduces asymmetry by designing electrodes with sharp corners rather than smooth symmetric surfaces. The sharp corners create asymmetric electrical field distributions that concentrate field lines at the corner points, significantly enhancing the local electrical field strength. This asymmetric design improves pump energy efficiency while remaining compatible with standard semiconductor fabrication processes.

Inventive Principle:

Principle #4Asymmetry

2Use of energy by moving object

If electroplating microelectrode is used to increase surface roughness, then the power efficiency increases, but the electrode surface morphology cannot be repeated reducing reliability

Engineering Contradiction:

Improvepower efficiencyVSAvoidenergy performance reliability

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent replaces the electroplating process with a photolithography and etching process to create sharp corners on the electrode surface. This substitution transitions from a chemical deposition method (electroplating) to a precision patterning method (photolithography), enabling repeatable and consistent electrode morphology. The sharp corners are formed through controlled etching of defined patterns, ensuring high reliability and reproducibility of the electrode surface structure.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Device complexity

If conventional pump electrode structure is used, then the device complexity is low, but the pump energy efficiency is low due to lower solid surface free energy

Engineering Contradiction:

Improveelectrode structure complexityVSAvoidpump energy efficiency

Core Design Contradiction:

Device complexityVSUse of energy by moving object

Solution Approach 1:

The patent changes the geometric parameters of the electrode surface by introducing sharp corners with specific dimensions (e.g., 10-100 micrometers in size). This parameter change increases the solid surface free energy and enhances the electrical field concentration, thereby improving pump energy efficiency. The modification is achieved through standard photolithography and etching processes, maintaining low device complexity while achieving significant energy efficiency improvements.

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 micro-delivery device with a planar electrode and sharp corners achieves faster startup speed and increased fluid output, significantly improving the efficiency of drug delivery compared to designs with flat surfaces.

Implementation Method 1

at least one sharp corner is formed on the surface of the planar electrode... enhances the local electrical field and surface energy

Methodology Applied

Scientific EffectElectrical field concentration: Electric Field

Implementation Method 2

electrochemical pump for a micro-delivery device... electrolysis pump product

Methodology Applied

Scientific EffectElectrolysis: Electrolysis

Data Source

PatentUS11460020B2Micro-delivery device

Publication Date: 2022.10.04 MICROMED CO LTD

AI summary

A micro-delivery device includes a substrate having an upper surface; a shell disposed on the upper surface of the substrate and defining a chamber between the shell and the substrate; a planar electrode disposed on the upper surface of the substrate; a separator disposed in the chamber and dividing the chamber into an upper reservoir and a lower reservoir; and a cannula inserted in an opening of the rigid shell and in fluid communication with the upper reservoir.