Radionuclide Generator Vented Outlet Cover Design

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Radionuclide generators face issues with terminal sterilization due to the ingress of condensate through vented outlet covers during steam sterilization, leading to reduced product life and radioactive integrity, as condensate can breach the filter and enter the column assembly, causing excess moisture and radionuclide migration.

Innovation Solution

A column assembly design with a vented outlet cover that prevents the ingress of gravity-driven liquid by orienting the vent opening downwardly, incorporating a filter at the vent opening, and using a pierceable membrane or removable cap to ensure fluid access while preventing condensate entry, thereby maintaining a sterile and dry environment during and after sterilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a vented outlet cover is used during sterilization to allow steam venting, then sterilization effectiveness is improved, but condensate can enter through the vent opening and breach the filter, reducing product life and radioactive integrity

Engineering Contradiction:

Improvesterilization effectivenessVSAvoidcondensate ingress

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The vent opening is inverted to face downward instead of upward. This orientation allows steam to escape while preventing condensate from entering the vent opening, as gravity causes liquid to drain away from the downward-facing opening. The filter remains in place but the vent geometry is reversed to eliminate the harmful effect of condensate accumulation and ingress.

Inventive Principle:

Principle #13The other way round (Inversion)

2Productivity

If the vent opening faces upward to facilitate steam escape, then sterilization efficiency is improved, but condensate accumulates on the filter surface and breaches into the column assembly, causing excess moisture and radionuclide migration

Engineering Contradiction:

Improvesterilization efficiencyVSAvoidradionuclide integrity

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The vent opening orientation is inverted from upward-facing to downward-facing. This reversal maintains steam venting capability while preventing condensate accumulation on the filter. The downward orientation uses gravity to keep liquid away from the vent opening, eliminating the source of excess moisture that would otherwise compromise radionuclide integrity and cause migration.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The vent opening is given a specific local quality of facing downward, different from the typical upward orientation. This localized geometric modification at the vent opening creates a functional distinction: the same filter and sterilization system maintain their properties, but the vent's orientation specifically addresses condensate management without affecting overall sterilization efficiency.

Inventive Principle:

Principle #3Local quality

3Reliability

If a filter is placed at the vent opening to prevent contaminant entry, then sterilization protection is improved, but the filter surface becomes a site for condensate accumulation that can breach and enter the flow path

Engineering Contradiction:

Improvesterilization protectionVSAvoidcondensate in flow path

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

Rather than modifying the filter to prevent condensate accumulation, the solution inverts the vent opening orientation. The filter remains at the vent opening providing its protective function, but the downward-facing vent geometry prevents condensate from reaching the filter surface in the first place, eliminating the accumulation and breach problem while maintaining sterilization protection.

Inventive Principle:

Principle #13The other way round (Inversion)

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

This solution consistently achieves high yield and prevents the migration of parent radionuclide, ensuring the radionuclide generator remains within safe radiation thresholds and maintains elution efficiency, with reduced variability in residual moisture levels after sterilization.

Implementation Method 1

prevents the ingress of gravity-driven liquid

Methodology Applied

Scientific EffectGravity: Gravitation

Implementation Method 2

incorporating a filter at the vent opening

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 3

liquid that resides in the column assembly, including the column and tubes that extend between the column and the inlet and outlet ports may be heated to vapor form (e.g., steam) to kill and/or inactivate contaminants

Methodology Applied

Scientific EffectVaporization: Evaporation

Data Source

PatentUS8822950B2Radionuclide generator and method of sterilization

Publication Date: 2014.09.02 SHINE SPECT USA LLC

AI summary

A column assembly of a radionuclide generator includes a column that retains a parent radionuclide that spontaneously decays to a relatively short-lived daughter radionuclide. A fluid path extends from an inlet port to the column and then to an outlet port and allows daughter radionuclide to be eluted from the radionuclide generator for use. Improved retention of parent radionuclide in the column is accomplished by preventing fluid from entering the flow path in a liquid state, such as during sterilization. Proper column chemistry is also promoted by preventing excess moisture from coalescing in the column, which may promote a higher and/or more reliable yield of daughter radionuclide from a radionuclide generator.