Pill Dispensing Device with Redundant Optical Counting and HEPA Filtration
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Solution Overview
Problem
Current pill dispensing devices are about 87% accurate, often over-counting pills, and prone to malfunctions due to dust and particulate accumulation, leading to inaccuracies and increased costs for high-volume pharmacies.
Innovation Solution
The implementation of a pill dispensing device with a temporary storage compartment, a feeding assembly, a dispensing route, multiple optical sensors, and a controller that uses redundant counting and a filtration system to enhance accuracy, and includes a HEPA filtration system to minimize dust and particulate issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional single sensor counting method is used, then device complexity is low, but measurement precision deteriorates (87% accuracy with over-counting tendency)
Solution Approach 1:
The patent places optical sensors at multiple distinct locations along the pill dispensing path (first sensor near the dispensing chute, second sensor at a different position). Each sensor provides a localized measurement of pill passage, and the combination of these distributed measurements achieves higher overall counting accuracy than a single sensor could provide.
Solution Approach 2:
The system compares count data from multiple sensors and uses this feedback to identify and correct counting errors. When sensors detect discrepancies in pill counts, the system can trigger verification processes or adjust dispensing operations to maintain accuracy, creating a closed-loop control system that continuously improves measurement precision.
2Reliability
If sensors are exposed to pill dust environment, then ease of operation is maintained, but reliability deteriorates (sensor malfunction due to dust accumulation)
Solution Approach 1:
The patent introduces a HEPA filtration system as an intermediary component between the pill storage/dispensing environment and the optical sensors. This filtration system captures and removes pill dust and particulates from the air, preventing them from accumulating on the sensors and causing malfunctions, thereby maintaining sensor reliability without adding significant operational complexity.
Solution Approach 2:
The filtration system operates continuously or periodically to preemptively remove dust and particulates from the environment before they can accumulate on the sensors. This preliminary cleaning action prevents sensor contamination and malfunction, ensuring reliable operation without requiring complex real-time detection and response systems.
3Productivity
If manual pill counting by pharmacists is used, then measurement precision is high for low volumes, but productivity deteriorates (time-consuming and labor-intensive)
Solution Approach 1:
The patent replaces the mechanical manual counting process with an automated optical sensing system. Optical sensors detect pill passage through light beam interruption, automatically recording counts without human intervention. This substitution dramatically increases dispensing throughput while maintaining high accuracy through the use of multiple sensors and verification protocols.
Solution Approach 2:
The dispensing system performs self-counting through automated optical sensors that detect and record pill passage independently. The system monitors its own operation, tracks dispensing volumes, and maintains accuracy records without requiring pharmacist verification for each count, enabling high-volume automated operation while preserving measurement precision.
4Measurement precision
If automated pill dispensing is implemented, then productivity increases, but measurement precision deteriorates (over-counting and under-counting errors)
Solution Approach 1:
The patent implements multiple optical sensors at different locations in the dispensing system to provide localized measurements of pill passage. This distributed sensing approach ensures accurate counting even at high dispensing volumes, as each sensor captures pill flow information from its specific position, and the combined data provides comprehensive and accurate volume measurement.
Solution Approach 2:
The system uses feedback from multiple sensors to continuously monitor and verify pill counts during automated dispensing. When count discrepancies are detected, the system can pause operation, alert operators, or initiate verification procedures, ensuring measurement precision is maintained even as productivity increases through automated high-volume operation.
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
This solution increases the accuracy of pill dispensing to approximately 99.7%, reducing errors and operational costs by ensuring precise counting and minimizing sensor malfunctions through improved filtration and redundant counting mechanisms.
Implementation Method 1
count each pill as it falls down a chute using a set of opposed and aligned sensors
Implementation Method 2
dust and particulate that settles on the surface of the sensors can cause the sensors to malfunction
Data Source
AI summary
Devices, systems, and methods for automatic pill dispensing are disclosed herein. An exemplary automatic pill dispensing device includes a temporary storage compartment, a feeding assembly, a dispensing route, a plurality of optical sensors, and a controller. The temporary storage compartment stores pills that are to be counted and eventually dispensed into a pill bottle. The feeding assembly is coupled to the temporary storage compartment and can move or stop the flow of pills into the dispensing route where the plurality of optical sensors count the pills as they pass by the light beams thereof. The controller receives a count from the plurality of optical sensors and stops the feeding assembly when a predetermined count of pills has been reached.Systems and methods utilizing the pill dispensing devices include incorporating a centralized computer and a conveyor belt system to accurately and efficiently dispense a plurality of pill types into pill bottles.