Dispensing Device Sensor Malfunction Detection via Blank Receptacles
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Solution Overview
Problem
Existing dispensing devices for medications with narrow therapeutic windows and variable doses often provide inaccurate dosing due to malfunctioning sensors, which can lead to over or under administration of medication, especially when dispensing small partial doses.
Innovation Solution
A dispensing device with a conveying member and a sensor system that includes blank receptacles invisible to the sensor, allowing for the detection of sensor malfunctions by distinguishing between the presence and absence of articles, and providing alerts for accurate dosing, along with a processor to manage and alert the user of potential errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is used to count articles being dispensed, then the dispensing accuracy is improved, but the sensor may malfunction and provide inaccurate doses
Solution Approach 1:
The system performs a preliminary test run before actual dispensing to verify sensor functionality. During this test, the sensor should detect a specific number of articles (n-m) passing by. If the sensor detects the correct number during the test run, it confirms the sensor is functioning properly before real dosing begins, preventing potential dosing errors.
Solution Approach 2:
The system continuously monitors sensor output and compares it against expected values. When the sensor detects articles passing by, this information is fed back to the control system, which verifies the count matches the expected number (n-m articles). Any discrepancy triggers an error signal, allowing real-time detection and correction of sensor malfunctions.
2Adaptability or versatility
If each tablet provides only a small partial dose, then the dosing flexibility is improved, but it becomes difficult to detect dispensing errors
Solution Approach 1:
The system introduces an intermediary verification mechanism between the sensor and the dosing decision. Rather than relying solely on the sensor count, the system uses a pre-configured expected value (n-m articles) as an intermediary reference point. The control system compares sensor output against this reference, making error detection easier even when individual tablet doses are small.
Solution Approach 2:
The system replaces manual verification of dosing accuracy with an automated electronic verification system. The control system automatically compares sensor readings against expected values and generates error signals, eliminating the need for manual counting or verification that would be particularly difficult with small partial doses.
3Productivity
If n receptacles are used on the conveyor, then the dispensing capacity is improved, but the sensor cannot distinguish between empty receptacles and blank receptacles
Solution Approach 1:
The system applies a local distinction between different types of receptacles. Blank receptacles are specifically designed with different physical or optical properties (local quality) compared to active receptacles, allowing the sensor to distinguish them. This localized differentiation enables accurate detection despite the overall complexity of having n receptacles on the conveyor.
Solution Approach 2:
The system uses optical properties (analogous to color changes) to differentiate receptacle types. Blank receptacles may have different reflectivity, transparency, or optical characteristics that allow the sensor to distinguish them from empty active receptacles. This optical differentiation enables accurate article detection across all n receptacles.
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
Ensures accurate dispensing of medication by identifying sensor malfunctions and preventing accidental overdosing or underdosing, enhancing the reliability of medication administration.
Implementation Method 1
the sensor comprises a photocell
Data Source
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AI summary
A device for dispensing articles, the device comprising: a conveying member comprising n receptacles, of which n - m are suitable for receiving articles, the receptacles being movable between an article receiving position and an article dispensing position; a sensor for sensing the presence of articles in the receptacles, the sensor positioned between the receiving position and the dispensing position; wherein m of said receptacles is a blank receptacle which is unable to receive an article and the sensor is unable to distinguish an empty receptacle from a blank receptacle such that the maximum number of detectable articles conveyed once n receptacles have passed the sensor is n - m, where m is at least 1.