Pressure-Regulating Vial Adaptor for Leak-Free Fluid Withdrawal

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Solution Overview

Problem

Existing systems for extracting medicinal fluids from vials face issues with pressure differentials leading to fluid leakage, inaccurate withdrawal or introduction, and contamination risks due to ambient air, particularly for volatile and hazardous drugs.

Innovation Solution

A pressure-regulating vial adaptor system with a flexible enclosure and regulator channel that maintains pressure equilibrium by expanding or contracting to compensate for fluid withdrawal or introduction, using a regulator enclosure and filler to manage pressure differentials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a traditional extraction system is used to withdraw fluid from a sealed vial, then fluid can be extracted from the vial, but pressure differentials cause fluid leakage, inaccurate withdrawal, and contamination risks

Engineering Contradiction:

Improvefluid withdrawal accuracyVSAvoidpressure differential control

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

A regulator enclosure containing a filler acts as an intermediary system between the extraction environment and the vial interior. The filler serves as a mediator that transmits pressure changes from the regulator enclosure to the vial, enabling controlled pressure equalization that prevents leakage and contamination while maintaining accurate fluid withdrawal

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The regulator enclosure creates a controlled, isolated environment that separates the extraction process from ambient air. By maintaining pressure equilibrium through the filler mechanism, the system prevents ambient air contamination while enabling accurate fluid measurement and withdrawal

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

2Reliability

If pressure is increased to prevent fluid leakage during extraction, then leakage is reduced, but fluid introduction accuracy decreases

Engineering Contradiction:

Improvefluid containmentVSAvoidfluid introduction accuracy

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The regulator enclosure with filler provides dynamic pressure adjustment capability. The system can adapt pressure levels in real-time during different phases of fluid transfer - maintaining higher pressure during withdrawal to prevent leakage, then equalizing pressure during introduction for accurate dosing - thereby resolving the contradiction between containment reliability and introduction precision

Inventive Principle:

Principle #15Dynamics

3Quantity of substance

If the regulator enclosure is fully expanded to provide sufficient regulator fluid volume, then fluid supply is adequate, but the device size increases

Engineering Contradiction:

Improveregulator fluid volumeVSAvoidregulator enclosure size

Core Design Contradiction:

Quantity of substanceVSVolume of moving object

Solution Approach 1:

The regulator enclosure utilizes a flexible, collapsible structure that can be compressed as regulator fluid is consumed. This flexible shell design allows the enclosure to maintain its functional volume for adequate fluid supply while minimizing its physical footprint when not in use, and enables the enclosure to be collapsed or folded for compact storage and transport

Inventive Principle:

Principle #30Flexible shells and thin films

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

Facilitates accurate and controlled fluid transfer while minimizing contamination and leakage, maintaining pressure balance within the vial, suitable for volatile and hazardous drugs.

Implementation Method 1

the filler is configured to ensure an initial volume of regulator fluid within the regulator enclosure, thereby permitting the adaptor to supply regulator fluid to the sealed vial from the regulator enclosure when fluid is withdrawn from the sealed vial via the extractor aperture

Methodology Applied

Scientific EffectPressure differential compensation:

Implementation Method 2

the regulator enclosure is configured to move between a first orientation, in which at least a portion of the regulator enclosure is at least partially expanded or unfolded, and a second orientation, in which at least a portion of the regulator enclosure is at least partially unexpanded or folded, when a fluid is withdrawn from the sealed vial via the extractor channel

Methodology Applied

Scientific EffectVolume expansion and contraction:

Data Source

PatentUS12508208B2Pressure-regulating vial adaptors

Publication Date: 2025.12.30 ICU MEDICAL INC

AI summary

In certain embodiments, a vial adaptor comprises a housing configured to couple the adaptor with a vial, an access channel, a regulator channel, and a regulator assembly. The access channel is configured to facilitate withdrawal of fluid from the vial when the adaptor is coupled to the vial. The regulator channel is configured to facilitate a flow of a regulating fluid from the regulator assembly to compensate for changes in volume of a medical fluid in the vial. In some embodiments, the regulator assembly includes a flexible member configured to expand and contract in accordance with changes in the volume of the medical fluid in the vial. In some embodiments, the flexible member is substantially free to expand and contract. In some embodiments, the flexible member is not partly or completely located in a rigid enclosure.