Pharmaceutical Dispensing Sensor Travel Time Detection
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Solution Overview
Problem
Existing automated pharmaceutical dispensing systems struggle to accurately differentiate between complete tablets and fragments, leading to incorrect counts and potential errors in dispensing.
Innovation Solution
A method and apparatus that use a sensor to detect the time an article takes to traverse a dispensing channel, comparing this time to an expected travel time for a complete article, with a configurable fragment percentage value to determine if the article is complete or a fragment, allowing for dynamic updating of travel times to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a counting sensor is used to detect tablets passing through the dispensing channel, then automated dispensing can be achieved, but tablet fragments are incorrectly classified as complete tablets resulting in inaccurate counts
Solution Approach 1:
The system dynamically adjusts the threshold for identifying complete tablets versus fragments based on real-time analysis of tablet travel times through the dispensing channel. By making the classification criterion adaptive rather than fixed, the system maintains high measurement precision across varying dispensing conditions while preserving automated operation.
Solution Approach 2:
The patent changes the parameter used for tablet classification from simple presence/absence detection to travel time measurement. By measuring how long each tablet takes to traverse the dispensing channel and comparing it against dynamically updated thresholds, the system can distinguish complete tablets from fragments with high accuracy, resolving the contradiction between automation and measurement precision.
2Device complexity
If the system uses a fixed threshold for identifying complete tablets, then the classification process is simple, but it cannot adapt to variations in tablet size, shape, or dispensing conditions leading to classification errors
Solution Approach 1:
The system implements feedback by continuously monitoring tablet travel times and using this information to dynamically adjust the threshold for classifying complete tablets versus fragments. This feedback mechanism allows the system to adapt to variations in tablet properties and dispensing conditions, significantly improving classification accuracy and reliability while maintaining a relatively simple overall process structure.
Solution Approach 2:
The patent performs preliminary analysis of tablet travel times to establish baseline characteristics before final classification. By pre-processing the travel time data and determining appropriate thresholds in advance of each dispensing operation, the system prepares the classification criteria optimally, improving reliability without adding significant complexity to the real-time classification process.
3Reliability
If the sensor detection zone is made larger to improve detection reliability, then more tablets can be detected, but the precision of measuring individual tablet passage time decreases
Solution Approach 1:
The patent transitions from measuring a single point in time to measuring a time interval (duration of passage through the detection zone). By considering the entire time a tablet takes to traverse the sensor zone rather than attempting to pinpoint a single moment of passage, the system achieves both high detection reliability and precise measurement of tablet passage characteristics.
Data Source
AI summary
A method for dispensing and detecting solid pharmaceutical articles includes: forcing an article through a dispensing channel and past a sensor configured and positioned to detect the article passing through the dispensing channel, wherein the article includes one of the solid pharmaceutical articles; generating a detection signal using the sensor responsive to the article passing through the dispensing channel, wherein the detection signal indicates a time that the article takes to traverse the sensor; and determining whether the article is a complete article or an article fragment responsive to a comparison of the time indicated by the detection signal and an article fragment travel time representing an expected travel time for a complete article to traverse the sensor that is determined independent of physical attributes of the solid pharmaceutical articles.