Multi-Pump Compounding for Accurate Low-Volume Fluid Delivery
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Solution Overview
Problem
Compounding devices face inefficiencies in setup time, downtime during source container replacement, and accuracy at small dispensed volumes, with challenges in maintaining aseptic conditions and preventing errors in fluid path connections.
Innovation Solution
A compounding system with a housing, multiple fluid lines, and a pump system featuring rotors and platens to manage different fluid volumes, along with a platen lock mechanism for accurate fluid delivery and a user-friendly interface for intuitive operation and easy cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional pump mechanisms are used for fluid delivery, then the device can handle various fluid volumes, but accuracy at small dispensed volumes deteriorates
Solution Approach 1:
The pump system is divided into multiple pump mechanisms, each optimized for specific volume ranges. The system segments the fluid delivery function across different pump types (e.g., syringe pump for small volumes, peristaltic pump for large volumes) to achieve both high precision at small volumes and versatility across volume ranges.
Solution Approach 2:
The system dynamically selects and switches between different pump mechanisms based on the required fluid volume. The controller automatically determines which pump to use based on real-time requirements, enabling the system to maintain high accuracy for small volumes while retaining adaptability for various fluid volumes.
2Measurement precision
If complex pump mechanisms are used to improve accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The controller serves multiple functions: it selects appropriate pumps, manages fluid delivery parameters, monitors system status, and handles source container replacement coordination. This centralized multi-functional control reduces the need for separate complex mechanisms for each function, achieving high precision while managing overall system complexity.
Solution Approach 2:
The controller acts as an intermediary that coordinates between the multiple pump mechanisms and the source container replacement system. It manages the complexity by providing a unified interface and automated decision-making logic, allowing precise fluid delivery without requiring direct complex interactions between all system components.
3Productivity
If source container replacement is performed during operation, then continuous fluid supply is maintained, but downtime during replacement increases
Solution Approach 1:
The system prepares the next source container in advance before the current one is depleted. The controller monitors fluid levels and automatically positions the replacement container ready for immediate connection, minimizing the actual downtime during source container replacement while maintaining continuous fluid supply capability.
4Adaptability or versatility
If multiple fluid lines are used to handle different volumes, then adaptability improves, but errors in fluid path connections increase
Solution Approach 1:
The controller receives feedback signals from sensors that monitor fluid line connections, pump status, and source container positions. This feedback mechanism detects potential connection errors and provides real-time verification, ensuring that the correct fluid paths are established before fluid delivery begins, thereby maintaining reliability despite multiple configuration options.
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
The system reduces downtime, improves accuracy at small volumes, and enhances aseptic maintenance, preventing errors and promoting efficient fluid handling and user interface usability.
Implementation Method 1
Gravimetric devices generally use a peristaltic pump mechanism combined with a weight scale or load cell to measure volume delivered
Data Source
AI summary
An exemplary compounding system and device for mixing materials can include a housing, a first material source and a second material source. A first fluid line can be operationally connected to the housing and configured to transport a first volume of fluid per unit time from the first material source to a final container. A second fluid line can be operationally connected to the housing and configured to transport a second volume of fluid per unit time from the second material source to the final container. The device can also include a pump system including, a first pump having a first rotor and a first platen which secures the first fluid line between the first rotor and the first platen, the first pump being configured to move the first volume of fluid through the first fluid line, and a second pump having a second rotor and a second platen which secures the second fluid line between the second rotor and the second platen, the second pump being configured to move the second volume of fluid through the second fluid line. A first platen lock can be provided and can be rotated in a first direction to lock the first platen in a closed position relative to the first rotor, and wherein rotation of the first rotor draws the first material source through the first fluid line. The pump system can also be configured such that the volume of fluid per unit time delivered by the first and second pumps is different, and/or where the first and second pumps have different head characteristics.