External Seal for Single-Use Bioreactor Sensor Interface
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Solution Overview
Problem
Existing single-use bioreactor systems face challenges in achieving a reliable and robust seal between sensor devices and bioreactor ports, particularly with barbed ports, which can lead to fluid leakage due to inadequate internal sealing mechanisms, such as O-rings, especially when the internal surface quality is compromised.
Innovation Solution
The implementation of an external seal mechanism that overlaps with both the sensor and the bioreactor port, providing a mechanical and fluidic seal that complements or replaces internal sealing methods, ensuring a more reliable and robust barrier against fluid leakage and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If internal sealing mechanisms (O-rings) are used in barbed ports, then the device complexity is reduced, but the reliability of the seal deteriorates due to inadequate sealing and fluid leakage
Solution Approach 1:
An external seal member is introduced as an intermediary component between the sensor device and the bioreactor port. This external seal member engages with both the sensor device and the port simultaneously, creating a redundant sealing mechanism that compensates for deficiencies in internal O-ring seals, particularly when internal surfaces are compromised.
Solution Approach 2:
The external seal member is designed to preemptively compensate for potential sealing failures before they occur. By providing an additional sealing layer that engages externally, the system cushiones against the harmful effect of fluid leakage that could result from degraded internal seal surfaces or manufacturing tolerances.
2Ease of manufacture
If simple barbed ports are used, then the ease of manufacture is improved, but the reliability of fluid containment deteriorates due to inadequate sealing
Solution Approach 1:
The sealing function is segmented into two independent components: the internal O-ring seal within the barbed port and the external seal member. This segmentation allows the port to remain simple and easy to manufacture while the external seal member provides the additional reliability needed for robust fluid containment.
3Device complexity
If internal O-ring seals are relied upon, then the device complexity is minimized, but the seal robustness deteriorates when internal surface quality is compromised
Solution Approach 1:
The external seal member acts as a mediator that bridges the sensor device and port, providing a sealing interface that is independent of the internal port surface quality. This external seal engages with external surfaces, thereby circumventing problems associated with compromised internal O-ring seal surfaces.
4Reliability
If external seal is added, then the seal reliability is improved, but the device complexity increases
Solution Approach 1:
The external seal member is designed as a simple, disposable component that can be easily manufactured and replaced. This approach accepts increased complexity as a trade-off for reliability, using a simple elastomeric or polymeric seal that provides robust sealing without requiring complex mechanisms, and can be discarded with the single-use bioreactor system.
Data Source
AI summary
A bioreactor sensing system is presented. The bioreactor sensing system comprises a bioreaction vessel. The bioreaction vessel comprises an aperture configured to provide an interface for monitoring contents within the bioreaction vessel. The bioreaction vessel also comprises a port coupled to the bioreaction vessel proximate the aperture. The bioreactor sensing system also comprises a sensing device disposed at least partially within the port such that a sensing element is exposed to the contents. The bioreactor sensing system also comprises an external seal configured to be applied over a portion of the sensing device and a portion of the port.