Home Cage Access Control Barrier for Automated Food Scheduling
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Solution Overview
Problem
Current automated food access methods for animals are either expensive, introduce confounding variables, or compromise cage hygiene and compatibility with existing vivarium infrastructure, making them unsuitable for high-throughput metabolic studies.
Innovation Solution
A networkable programmable access control device that fits within an animal's home cage, using a controller and movable barrier to regulate food access based on an operator-defined schedule, eliminating the need for costly metabolic cages and minimizing environmental exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If metabolic cages are used to control food access, then automated food access control is achieved, but cost increases and cage compatibility with existing vivarium infrastructure deteriorates
Solution Approach 1:
The invention extracts the food access control function from the complex metabolic cage system and implements it as a separate, simple barrier mechanism that can be integrated into existing home cages. The barrier is a standalone component that does not require the animal to be transferred to a specialized metabolic cage, thus maintaining compatibility with existing vivarium infrastructure while achieving automated food access control.
Solution Approach 2:
The barrier mechanism is designed to be universally applicable to existing home cages without requiring modifications to the cage structure. It can be installed in various cage types and configurations, making the solution compatible with existing vivarium infrastructure while providing automated food access control functionality.
2Extent of automation
If specially modified cages with external food access devices are used, then food access control is achieved, but cage hygiene deteriorates due to exposure to outside environment
Solution Approach 1:
The barrier mechanism is nested within the existing home cage structure, specifically utilizing the food hopper area. The barrier is positioned inside the cage to block access to the food hopper, ensuring that the food storage area remains sealed and protected from external contaminants while automated food access control is maintained.
3Extent of automation
If operant behavior cages are used to dispense food, then automated food access is achieved, but confounding variables are introduced through behavioral conditioning requirements
Solution Approach 1:
The barrier mechanism operates autonomously based on pre-programmed schedules without requiring any behavioral responses from the animals. The system automatically opens and closes the barrier according to the designated feeding schedule, eliminating the need for operant conditioning and ensuring that food access is controlled purely by time-based parameters, thus maintaining study validity.
4Extent of automation
If metabolic cages are used for all animals, then automated food access control is achieved, but operational cost increases
Solution Approach 1:
The barrier mechanism is designed as a simple, inexpensive component that can be easily manufactured and deployed across multiple home cages. Rather than investing in expensive metabolic cages for each animal, the invention uses a cost-effective barrier solution that can be implemented in existing cages, significantly reducing operational costs while maintaining automated food access control functionality.
Data Source
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AI summary
An apparatus comprising at least one access controller device 100, comprising: a controller 104 configured to deliver access signals according to an access schedule based on data entered into the controller by an operator; and a movable barrier 108 configured to be positioned in a home cage 102 between a storage area 116 and a living area 114 and configured to be movable between an access position 112 where there is unrestricted access to an item in the food storage area from the living area and a restricted position 110 where the access is denied. The movable barrier is moved between the access position and the restricted position in response to the access signals. The movable barrier is configured to fit entirely within the home cage and a food hopper of the home cage without making any modifications to the home cage or the food hopper.