Drug Delivery Dosing Mechanism Mode Detection
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Solution Overview
Problem
Current drug delivery devices lack a reliable mechanism to distinguish between dialing and dispensing modes, making it difficult for users to accurately select and administer variable doses of medication, especially for users with impaired dexterity or visual impairments.
Innovation Solution
The dosing mechanism incorporates a determination unit with a microprocessor, proximity sensor, and lighting element to differentiate between dialing and dispensing modes, using a lever arm and flexible design to detect position changes and provide visual and audible feedback, and includes a camera for enhanced dose visualization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical display with a drum or number sleeve is used to indicate the selected dose, then the device structure remains simple, but users with impaired dexterity or visual impairments cannot accurately perceive the dose selection
Solution Approach 1:
The patent replaces the mechanical display system (drum or number sleeve) with an electronic display system comprising a camera, image processing unit, and display element. The camera captures images of the dose selection interface, the image processing unit processes these images to determine the selected dose, and the display element presents this information in multiple formats (visual, tactile, auditory) to accommodate users with various impairments.
Solution Approach 2:
The patent introduces an intermediary image processing system that acts as a mediator between the mechanical dose selection mechanism and the user. The camera and image processing unit translate the mechanical position of dose indicators into processed visual information that can be displayed in multiple formats, bridging the gap between the simple mechanical interface and the needs of users with impaired perception.
2Reliability
If the device lacks a determination unit to detect dosing mode, then the device structure remains simple, but users cannot reliably distinguish between dialing and dispensing modes
Solution Approach 1:
The patent implements a determination unit that continuously monitors the position of the indicating element and provides feedback to both the control unit and the user. The control unit uses this feedback to determine whether the device is in dialing or dispensing mode, while the display element provides visual feedback to confirm the current mode to the user, ensuring reliable mode distinction.
Solution Approach 2:
The patent replaces any potential mechanical mode indication system with an electronic determination and indication system. The determination unit uses optical sensing (camera or proximity sensor) to detect the position of mechanical components, and the control unit processes this information to determine the operational mode, replacing complex mechanical interlocking systems with electronic detection and control.
3Reliability
If electronic components (camera, microprocessor, proximity sensor) are added to detect and indicate dosing mode, then mode detection reliability improves, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent designs the electronic components to serve multiple functions: the camera or proximity sensor detects both the position of the indicating element for mode determination and provides visual feedback to the user; the control unit processes information for both mode determination and dose calculation; the display element presents information in multiple formats. This multi-functionality reduces the total number of components needed and simplifies manufacturing.
4Measurement precision
If a lever arm with indicating element is used to detect position changes, then the mechanical structure remains simple, but the detection precision for mode differentiation is insufficient
Solution Approach 1:
The patent replaces simple mechanical position detection with optical detection systems (camera or proximity sensor). These optical systems can detect the position of the indicating element with high precision by measuring light reflection or proximity, providing accurate mode differentiation without requiring complex mechanical detection mechanisms.
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 enables precise dose selection and administration, improves user safety and accessibility, particularly for those with impaired dexterity or vision, by clearly indicating the dosing mode and allowing for electronic processing of dialed and dispensed doses.
Implementation Method 1
the proximity sensor detects the position of the indicating element measuring the reflected electromagnetic radiation by the indicating element
Implementation Method 2
the absorption of the electromagnetic radiation impinging on the indicating element
Implementation Method 3
a lighting element in the visible or invisible wavelength range, for example a visible LED or an infrared LED
Data Source
AI summary
This disclosure refers to a dosing mechanism for use in a drug delivery device implementing a dialing mode and a dispensing mode, wherein the dosing mechanism comprises a dose button, a housing and a determination unit. The dose button is activatable by the user for dose dispense, causing displacement of an indicating element connected to the housing from a first position to a second position. The determination unit is adapted such that it detects the indicating element in its second position and thereby determines that the dosing mechanism is in the dispensing mode. With some embodiments, it is possible to distinguish between the dialing mode and the dispensing mode. Some embodiments further refer to a drug delivery device comprising the above dosing mechanism.