Pressure-Activated Disinfection Cap for Luer Sealing

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Solution Overview

Problem

Existing disinfection methods for medical connectors, particularly male luer connectors, are inadequate in preventing disinfectant ingress into the blood stream and fail to provide effective disinfection due to compliance issues and weak protection against contamination.

Innovation Solution

A disinfection cap with a cylindrical sidewall and a retention rod or corrugated capsule that retains disinfectant within a fluid reservoir, which releases disinfectant upon insertion of the luer connector, creating a fluid seal and disinfecting the hub and periphery while blocking ingress into the lumen.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If disinfectant is applied to disinfect the luer connector hub and periphery, then disinfection effectiveness is improved, but disinfectant may ingress into the lumen and enter the bloodstream

Engineering Contradiction:

Improvedisinfection effectivenessVSAvoiddisinfectant ingress into bloodstream

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A barrier member is introduced as an intermediary element between the disinfectant and the lumen. The barrier member selectively allows disinfectant to contact the hub and periphery while blocking ingress into the lumen, thus mediating between the need for disinfection and the need to prevent disinfectant contamination of the fluid path

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The barrier member provides different properties at different locations: it is permeable or open to disinfectant at the hub interface to allow disinfection, while being impermeable at the lumen interface to prevent contamination. This local differentiation of barrier properties resolves the contradiction between disinfection effectiveness and prevention of harmful ingress

Inventive Principle:

Principle #3Local quality

2Ease of operation

If traditional scrubbing methods are used with alcohol pads, then disinfection can be performed, but compliance is low and protection against contamination is weak

Engineering Contradiction:

Improvedisinfection procedure simplicityVSAvoidcompliance and protection effectiveness

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The disinfection cap is designed to be self-activating through a simple snap-action mechanism. When the cap is placed over the luer connector, the hub automatically triggers the barrier member to seal against the lumen, eliminating the need for complex scrubbing procedures and improving both ease of use and reliability of protection

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The barrier member is pre-positioned within the cap in a ready state, and the hub's insertion automatically activates the sealing action before any potential contamination can occur. This preliminary positioning and automatic activation ensures consistent protection without requiring user skill or attention

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If the luer connector is left exposed for easy access, then ease of operation is improved, but contamination risk increases

Engineering Contradiction:

Improveconnector accessibilityVSAvoidtouch contamination

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The barrier member is nested within the cap structure in a compact form, and when the cap is placed over the luer connector, the barrier automatically deploys to cover the hub. This nested design allows the connector to remain accessible while providing automatic protection against contamination

Inventive Principle:

Principle #7Nested doll (Nesting)

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 disinfection cap effectively disinfects the luer connector hub and periphery while preventing disinfectant entry into the fluid path, enhancing safety and reducing the risk of catheter-related bloodstream infections.

Implementation Method 1

Upon compression of the elongated body, the at least one corrugation collapses on one another causing a pressure buildup within the reservoir

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 2

the pressure buildup causes the plurality of apertures to deform and open, causing disinfectant to eject from the plurality of apertures

Methodology Applied

Scientific EffectPressure buildup: Pressure Increase

Implementation Method 3

In an initial, uncompressed state, the plurality of apertures are configured to not excrete disinfectant due to negative pressure within the reservoir

Methodology Applied

Scientific EffectNegative pressure retention: Pressure Increase

Data Source

PatentEP4135825B1Disinfection cap

Publication Date: 2025.10.22 BECTON DICKINSON & CO

Figure 1
Figure 2~3A
Figure 3B~4A

AI summary

A disinfection cap is described for connection to a medical connector; the disinfection cap includes a housing having a top wall and sidewall forming a cavity. In one or more embodiments, a retention rod forming a fluid reservoir is disposed within the cavity for retaining disinfectant. In one or more embodiments, a corrugated capsule is disposed within the cavity for retaining disinfectant. Pressure buildup within the cavity due to insertion of a luer connector causes expulsion of disinfectant, thereby disinfecting the luer connector.