Blister Packaging Error Reduction via Barcode Verification
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Solution Overview
Problem
Human errors in packaging medication doses in blister packs, such as overpacking, underpacking, or incorrect dosing, persist despite pharmacist checks, highlighting the need for enhanced verification processes.
Innovation Solution
A bar code-based system that includes software for patient-specific data storage, a printer for generating header sheets, a bar code reader for container identification, a comparator for error detection, and a signal generator to prevent incorrect loading, ensuring accurate medication selection and recording of faults for operator evaluation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pharmacist checks are used to verify medication doses, then human oversight is provided, but packaging errors still occur due to human error
Solution Approach 1:
The patent replaces the mechanical/manual checking system performed by pharmacists with an automated optical scanning system using bar code readers. The system automatically scans bar codes on medication containers and compares them against the prescription data, eliminating human error in verification while maintaining system reliability.
Solution Approach 2:
The patent introduces bar codes as an intermediary element between the medication containers and the verification process. These bar codes encode medication identity and dosage information, serving as a reliable intermediary that enables automated verification without requiring direct human interpretation or manual checking.
2Reliability
If automated bar code verification is implemented, then packaging accuracy is improved, but device complexity increases
Solution Approach 1:
The patent designs the verification system to perform multiple functions: scanning bar codes, decoding information, comparing data against prescriptions, generating visual feedback, and controlling the loading process. This multi-functional approach consolidates what could be separate complex systems into a unified verification apparatus.
Solution Approach 2:
The patent incorporates visual feedback mechanisms that provide real-time confirmation to operators when the correct medication is selected. This feedback loop allows the system to guide operators through the process, reducing the need for complex manual verification procedures while maintaining high accuracy.
3Measurement precision
If real-time verification is provided, then error detection is improved, but processing time increases
Solution Approach 1:
The patent performs verification checks continuously during the loading process rather than as a separate final step. The bar code scanning and comparison occur in real-time as each medication is being loaded, allowing error detection without adding significant time to the overall packaging process.
Solution Approach 2:
The verification system operates continuously throughout the packaging process, with bar code scanning and data comparison occurring simultaneously with the loading actions. This continuous verification approach ensures that error detection is integrated into the workflow rather than being an additional sequential step.
Data Source
AI summary
An apparatus for reducing human error in loading prescribed medications automatically into blisters (18) of a blister sheet. The operator is provided with a manually-operated controller (15) with which the amount and nature of a particular medication dose can be selected. The operator uses the controller (15) to select the required dosage from a chosen container (13). Each container (13) has a first bar code (14) identifying the nature of the doses it contains. A second bar code is pre-printed on a header sheet (4) which is destined to be attached to the blister sheet after its blisters have been loaded. The second bar code contains information identifying the patient and the contents of the various blisters. A comparator (12) responds to a lack of coincidence between the first and second barcode, by flashing the screen to indicate to the operator that an error has been made.