Disposable Medium Exchange Container for Contamination-Free Cell Culture
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Solution Overview
Problem
Conventional medium exchange devices for cell culture bottles suffer from cross-contamination due to the reuse of tubes, leading to reduced success rates in cell cultivation.
Innovation Solution
A medium exchange system with a stepper motor-driven mechanism that includes clamping arms and a slider system to rotate and synchronize the movement of medium exchange containers, allowing for the automatic replacement of culture medium while preventing contamination by using new containers for each exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional tubes are reused for medium exchange, then the device complexity is reduced and operation is simplified, but cross-contamination occurs between multiple cell culture bottles
Solution Approach 1:
The system divides the medium exchange process into separate operations for different bottles by using a multi-position carousel platform. Each position can be independently accessed by the robotic arm, allowing sequential exchange of medium in multiple bottles without cross-contamination while maintaining automated operation.
Solution Approach 2:
The robotic arm serves as an intermediary that transfers the exchange tube between different bottle positions on the carousel. This intermediary mechanism enables the single tube to service multiple bottles sequentially without direct contact between bottles, preventing cross-contamination while simplifying the overall system structure.
2Device complexity
If a single exchange tube is used for multiple bottles, then the quantity of components is reduced, but contamination accumulates on the tube surface
Solution Approach 1:
The system implements a disposable exchange tube that is discarded after use in one bottle and replaced with a fresh tube for the next bottle. This eliminates contamination accumulation on tube surfaces while maintaining a simple single-tube design. The used tube is disposed of in a waste container and a new tube is loaded from storage.
3Productivity
If manual medium exchange is performed, then the device complexity is minimized, but productivity is reduced and contamination risk increases
Solution Approach 1:
The robotic arm is designed as a universal mechanism that performs multiple functions: positioning the exchange tube, transferring it between bottles, and coordinating with the carousel platform. This multi-functional design achieves automated high-speed medium exchange while keeping the overall system structure relatively simple by consolidating multiple functions into a single robotic unit.
Data Source
AI summary
A medium exchange system for cell culture bottles that prevents mutual contamination includes a medium exchange device, which has a stepper motor connected to a linear slide above. The first linear slide is driven to rotate by the stepper motor and has a first slider and a second slider, each having a lower clamping arm and an upper clamping arm. A medium exchange container includes a medium exchange cylinder attached to an extension tube on an end thereof, while another end thereof is inserted by a push rod. The lower clamping arm is adapted to grip the medium exchange cylinder, and the upper clamping arm is adapted to grip the push rod. Both the clamping arms move towards a cell culture bottle, allowing the extension tube to penetrate into the cell culture bottle for medium exchange. The used medium exchange container can be replaced by using the medium exchange device.