Antimicrobial Male Luer Cap for Infection-Resistant Sealing

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Solution Overview

Problem

Infusion devices such as catheters and luer caps commonly used in medical care are prone to infections due to microorganisms migrating through the threaded regions and sealing interfaces, leading to elevated mortality rates and healthcare costs.

Innovation Solution

A male luer cap with an antimicrobial composition, including a slower-dissolving material covering the antimicrobial agent, forms a fluid-tight seal with a female luer, ensuring the agent is exposed to the fluid path, thereby reducing microbial contamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional male and female luer connectors are used with threaded regions and tapered sealing surfaces, then fluid-tight sealing is achieved, but microorganisms can migrate through the threaded region and penetrate the sealing region, causing infections

Engineering Contradiction:

Improvesealing effectivenessVSAvoidmicrobial contamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by pre-coating the male luer connector surfaces with an antimicrobial composition before use. This composition includes a water-soluble polymer and antimicrobial agent that are delivered through a delivery device and allowed to dry on the connector surfaces. When the connection is made, this pre-applied antimicrobial layer is pushed into the fluid path and kills microorganisms that attempt to migrate through the threaded region or penetrate the sealing region, thereby preventing infections while maintaining the reliability of the fluid-tight seal

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses an antimicrobial composition as an intermediary substance between the male and female connector surfaces. This composition, consisting of a water-soluble polymer matrix containing antimicrobial agents, is applied to the male luer connector and transferred to the female luer during connection. It acts as a mediator that eliminates harmful microorganisms in the fluid path without interfering with the mechanical sealing function of the tapered surfaces and threaded regions

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the male luer connector surfaces are tapered to form a seal with the female luer, then fluid containment is achieved, but organisms can remain on the walls of the connectors and be pushed into the fluid path during insertion

Engineering Contradiction:

Improvefluid containmentVSAvoidorganism multiplication and infection

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent applies preliminary action by pre-coating the male luer connector surfaces with an antimicrobial composition before use. This composition includes a water-soluble polymer and antimicrobial agent that are delivered through a delivery device and allowed to dry on the connector surfaces. When the connection is made, this pre_applied antimicrobial layer is pushed into the fluid path and kills microorganisms that attempt to migrate through the threaded region or penetrate the sealing region, thereby preventing infections while maintaining the reliability of the fluid-tight seal

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Inventive Principle:

Principle #24Intermediary (Mediator)

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 antimicrobial composition effectively prevents microbial ingress and multiplication within the fluid path, significantly reducing the risk of infections associated with infusion devices.

Implementation Method 1

The distal tip comprises a water-soluble material configured to dissolve in fluid to expose the antimicrobial composition

Methodology Applied

Scientific EffectDissolution: Solvation

Implementation Method 2

The antimicrobial composition effectively prevents microbial ingress and multiplication within the fluid path

Methodology Applied

Scientific EffectAntimicrobial action:

Data Source

PatentUS12485263B2Device for delivering an antimicrobial composition into a medical device

Publication Date: 2025.12.02 ICU MEDICAL INC

AI summary

A male cap can include a male tapered outer surface that can be configured to mate with a female luer to create a fluid tight fit. The male cap can also include a water-soluble antimicrobial composition disposed on the male extension. The male cap can include a fluid-soluble, slower-dissolving material covering the water-soluble antimicrobial composition or incorporated within the water-soluble antimicrobial composition. The slower-dissolving material can be configured to slow a dissolution of the water-soluble antimicrobial composition during installation of the male cap into the female luer.