Modular Inhalation Chambers for Reproducible Drug Vapor Testing
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Solution Overview
Problem
Existing drug and alcohol research systems face challenges in achieving predictable and reproducible blood levels (BLs) of substances in test animals, as current methods are stressful, costly, and lack flexibility in drug delivery, leading to inconsistent results and high maintenance costs.
Innovation Solution
A stand-alone or table top inhalation chamber system with multiple drug delivery options, including positive and negative pressure systems, and a multi-chamber system allowing selective uniform drug delivery to multiple chambers from a single passive system, enabling simultaneous testing of different drugs or drug concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a large vapor chamber system containing up to fifteen test subject cages is used, then multiple animals can be tested simultaneously, but the system requires an entire dedicated room, has very high initial cost, and requires a full-time employee for maintenance
Solution Approach 1:
The system is divided into multiple independent modules, each capable of housing test animals and delivering vapor separately. These modules can be arranged in series or parallel configurations, allowing the system to be scaled according to specific needs without requiring a single large chamber. Each module can be maintained independently, reducing the complexity of system-wide maintenance.
Solution Approach 2:
The modular design allows each unit to serve multiple functions: housing animals, delivering vapor, and being independently maintained. The standardized modules can be configured for different experimental requirements, making the system adaptable to various research needs while maintaining a consistent base platform.
2Ease of operation
If the entire vapor chamber system is opened to remove one animal, then the animal can be accessed for testing, but the balance in the system is destroyed and time is required to return to equilibrium
Solution Approach 1:
Each animal housing unit is a separate, independently accessible module. The quick-connect/disconnect fittings allow individual modules to be removed or accessed without opening the entire system. This segmentation enables researchers to access specific animals for procedures like blood sampling while maintaining the vapor environment integrity for all other animals in the system.
3Measurement precision
If handling of animals is performed to check BAL or conduct tests, then necessary measurements can be obtained, but stress hormones such as corticosterone are released which can interfere with the outcome of results
Solution Approach 1:
The system incorporates automated sampling ports and measurement interfaces that allow researchers to obtain blood samples and conduct tests without direct manual handling of the animals. These intermediary mechanisms enable measurements to be taken through the chamber walls or via automated systems, minimizing the stress imposed on animals during sampling procedures.
4Device complexity
If a single vapor delivery system is used for multiple chambers, then cost and complexity are reduced, but flexibility in delivering different drugs or concentrations to different chambers is limited
Solution Approach 1:
The vapor delivery system is segmented into independent control units for each chamber or group of chambers. Each segment can be configured to deliver specific drugs or concentrations as needed. The segments connect to a common base system through standardized fittings, allowing for flexible configuration without requiring a completely separate delivery system for each chamber.
Solution Approach 2:
The system incorporates adjustable and reconfigurable delivery parameters for each module. Researchers can dynamically change the type of vapor, concentration, and delivery timing for each chamber independently. The quick-connect fittings allow for rapid reconfiguration of the system to accommodate different experimental protocols without permanent modifications.
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 provides flexible and stress-reduced drug delivery options, allowing for predictable and reproducible BLs, reducing stress hormones, and enabling efficient, cost-effective drug testing across multiple chambers.
Implementation Method 1
liquid bubblers or mixing chambers and associated air and liquid pumps
Implementation Method 2
associated air and liquid pumps
Implementation Method 3
heaters
Implementation Method 4
supply metered quantities of a selected substance (e.g., alcohol, nicotine, cocaine, THC and other drugs or stimulants) to the interior of the chamber via supply hose
Data Source
AI summary
A stand-alone chamber or multi-chamber inhalation system has at least two alternative vaporized test liquid supply systems for passive or self-administered delivery of vaporized test fluid and air to one or more test chambers, which can be passive or restraint chambers, based on operator selection of delivery on and off times in a passive mode or actuation of an actuator in the chamber by a test animal in a self-administered mode. In one case, a multiple inhalation chamber system has two or more separate test fluid delivery systems and provides options for selective passive uniform drug delivery to multiple chambers or selective delivery of two or more different drugs to different groups of chambers from different delivery systems so that two different drugs or different concentrations of delivered drugs can be tested simultaneously.