Bioreactor Addition Tube Check Valve for Controlled Reagent Delivery
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Solution Overview
Problem
Existing bioreactor systems face challenges in controlling the addition of reagents, leading to unpredictable delivery and potential cell death due to toxic conditions when the delivery orifice is immersed, and inefficient distribution when suspended above the medium.
Innovation Solution
A bioreactor design incorporating a check valve in proximity to the delivery orifice of the addition tube, which allows fluid flow only in one direction, preventing backflow and ensuring controlled reagent delivery directly into the cell culture medium, with adjustable orifice positioning and suitable check valve constructions to minimize stagnant zones and pressure fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the delivery orifice is immersed in the cell culture medium, then the reagent can be delivered directly into the medium, but cells may enter the tube and be subjected to highly toxic conditions leading to cell death
Solution Approach 1:
A check valve is introduced as an intermediary component between the addition tube and the bioreactor vessel. This check valve allows reagent to flow from the addition tube into the vessel while preventing backflow that would expose cells to toxic reagent concentrations. The check valve thus mediates the interaction between the reagent delivery system and the cell culture environment, enabling direct medium immersion for efficient distribution while protecting cells from harmful effects.
2Object-affected harmful factors
If the delivery orifice is suspended above the medium, then cells are protected from toxic conditions, but the reagent may go primarily into the foam layer on top of the medium, preventing proper distribution
Solution Approach 1:
The check valve serves as a mediator that enables the delivery orifice to be positioned within the medium for efficient distribution while preventing the harmful backflow effect. By allowing forward flow into the vessel and blocking reverse flow, the check valve decouples the distribution efficiency benefit of immersion from the harmful cell exposure effect, enabling optimal positioning without compromising cell safety.
3Device complexity
If the pump is run intermittently with fixed addition program, then the system is simple to operate, but reagent may be delivered by dripping or diffusion even when the pump is stopped, causing poor control of the reagent supply
Solution Approach 1:
The check valve provides passive feedback control by automatically responding to pressure differential changes. When pump pressure exceeds backpressure, the valve opens to allow reagent flow; when pump pressure drops below backpressure, the valve closes to prevent backflow and uncontrolled delivery. This feedback mechanism eliminates the need for complex active control systems while ensuring precise reagent supply control, as the valve state automatically reflects the pressure balance between delivery and backpressure forces.
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
Ensures precise and even distribution of reagents, preventing local high concentrations and cell exposure to toxic conditions, while maintaining efficient fluid delivery and distribution within the bioreactor.
Implementation Method 1
a check valve (7;27) is arranged in proximity of, or adjacent, the delivery orifice such that it allows flow of a fluid in the direction from the addition tube into the inner volume (3;23) and blocking flow in the reverse direction
Implementation Method 2
the reagents are evenly distributed
Implementation Method 3
reagent may be delivered by dripping or diffusion
Data Source
Figure 1
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AI summary
The invention discloses a bioreactor with a vessel defining an inner volume, agitation means and at least one addition tube, wherein a delivery orifice in the addition tube is located within the inner volume and a check valve is arranged in proximity of the delivery orifice for allowing flow of a fluid in the direction from the addition tube into the inner volume of the vessel and blocking flow in the reverse direction.