Perfusion Bioreactor DO Probe Orientation for Bubble-Free Measurement

Solution Overview

Problem

Accurate measurement of dissolved oxygen levels in perfusion bioreactors is challenging due to issues like air bubble accumulation, leading to falsely increased or decreased readings, which affects cell growth and metabolite synthesis, and is critical for maintaining optimal culturing conditions.

Innovation Solution

Selecting a fixed orientation for the dissolved oxygen probe in a perfusion bioreactor by testing multiple positions to avoid air bubble interference, allowing for accurate DO level measurement, and adjusting culturing conditions such as DO setpoint and volumetric input power.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the DO probe is placed in a perfusion bioreactor without optimizing orientation, then the device complexity is reduced, but the measurement precision deteriorates due to air bubble accumulation causing falsely increased or decreased readings

Engineering Contradiction:

ImproveDO level measurement accuracyVSAvoidprobe orientation optimization process

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies preliminary action by determining the optimal DO probe orientation before actual cell culture operations. The method involves placing the probe at multiple different fixed orientations, measuring DO levels at each orientation, and selecting the optimal orientation that provides accurate readings without air bubble interference. This preliminary optimization ensures measurement precision is established before production runs begin.

Inventive Principle:

Principle #10Preliminary action

2Reliability

If air bubbles accumulate on the DO probe, then the device complexity remains simple, but the reliability of DO control deteriorates due to falsely increased readings affecting cell growth and metabolite production

Engineering Contradiction:

ImproveDO control accuracyVSAvoidair bubble interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful effect of air bubbles into a useful diagnostic tool. By systematically testing different probe orientations and observing which orientations exhibit air bubble accumulation (indicated by falsely increased DO readings), the method identifies and selects orientations that avoid bubble interference. The harmful bubble phenomenon is thus transformed into information that guides optimal probe placement.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Productivity

If the DO probe orientation is not optimized, then the ease of operation is maintained, but the productivity deteriorates due to incorrect DO levels affecting cell viability and recombinant protein production

Engineering Contradiction:

Improverecombinant protein productionVSAvoidprobe installation simplicity

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The patent applies preliminary action by determining the optimal DO probe orientation before actual cell culture operations. The method involves placing the probe at multiple different fixed orientations, measuring DO levels at each orientation, and selecting the optimal orientation that provides accurate readings without air bubble interference. This preliminary optimization ensures measurement precision is established before production runs begin.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS20260109930A1Methods of optimizing dissolved oxygen levels in cell culture

Publication Date: 2026.04.23 GENZYME CORP

AI summary

Provided herein are methods of selecting an optimal fixed orientation of a dissolved oxygen (DO) probe in a perfusion bioreactor and culturing a mammalian cell in a perfusion bioreactor having the DO probe positioned at the selected fixed orientation.