Dosing Pen Feedback Mechanism Prevents Double Dosing
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Solution Overview
Problem
Traditional dosing pens lack a mechanism to prevent accidental double dosing, which can be life-threatening, as users often forget if a dose has been delivered over time.
Innovation Solution
A dosing pen equipped with a feedback element and a countdown timer that activates upon depression of the injection button, providing a dual-state system to alert the user of an attempt to deliver an excess dose through visual, auditory, or haptic feedback if the button is pressed again within a set time frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional dosing pens are used without additional safety mechanisms, then the device complexity remains low, but the reliability of dose administration deteriorates due to potential accidental double dosing
Solution Approach 1:
The patent implements a feedback mechanism where a sensor detects button presses and triggers a feedback element (visual, auditory, or haptic) to alert the user. This closed-loop feedback system provides real-time information about dosing status, preventing accidental double dosing by immediately notifying the user when a dose has been administered or when attempting to dose too frequently.
Solution Approach 2:
The system performs preliminary action by establishing a timer interval before allowing another dose. The feedback element is activated in advance to warn the user before an excess dose can be administered, enabling the user to correct the action before harm occurs. The countdown timer creates a pre-emptive safety barrier.
2Reliability
If a feedback mechanism with timer is added to the dosing pen, then the reliability of dose administration improves by preventing double dosing, but the device complexity increases due to additional components
Solution Approach 1:
The patent employs feedback through multiple modalities (visual LED, auditory speaker, or haptic vibrator) that provide immediate notification to the user about dosing status. This multi-sensory feedback approach enhances reliability by ensuring the user perceives the alert regardless of their current state, while the underlying timer logic remains relatively simple.
Solution Approach 2:
The feedback element acts as an intermediary between the timer mechanism and the user. Rather than requiring direct user interaction with complex timer settings, the feedback element mediates the timing information in an intuitive, perceptible form, simplifying the user interface while maintaining accurate dose interval control.
3Loss of information
If the feedback element remains active continuously, then the user is constantly reminded of dosing status, but the energy consumption increases and the feedback becomes less noticeable
Solution Approach 1:
The feedback element operates periodically rather than continuously, activating only during critical moments (when a dose is delivered or when the user attempts to dose too frequently). This periodic operation maintains dosing status awareness when needed while conserving battery power during intervals between doses, addressing both information retention and energy consumption concerns.
Solution Approach 2:
The system applies preliminary anti-action by activating the feedback element only when necessary to prevent harmful behavior (double dosing). Rather than continuously reminding the user, the system strategically activates feedback to counteract potential mistakes before they occur, maintaining awareness while minimizing energy use.
4Ease of operation
If the countdown timer duration is extended, then the user has more time to remember the dose, but the window for preventing double dosing is reduced
Solution Approach 1:
The feedback mechanism provides real-time information about the current dosing status and timer state, enabling users to make informed decisions about whether to administer another dose. This immediate feedback allows for longer timer intervals while maintaining safety, as users can actively monitor the system state rather than relying solely on memory.
Solution Approach 2:
The system serves itself by automatically tracking dose timing and managing the countdown timer without requiring user intervention. The feedback element communicates the system's internal state to the user, allowing the timer to be extended while maintaining prevention effectiveness through automated monitoring and clear status communication.
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
Prevents accidental double dosing by alerting the user through a feedback mechanism, ensuring safe and accurate administration of medication by indicating the last dose time and inhibiting further dosing attempts within the timer's duration.
Implementation Method 1
a finger placement sensor at a top surface of the button, the sensor electrically actuating the feedback element
Implementation Method 2
The feedback element is a light emitting diode (LED)
Implementation Method 3
The feedback element is a piezoelectric speaker
Implementation Method 4
The feedback element is a piezoelectric vibrator
Data Source
AI summary
A dosing pen includes a barrel housing a reservoir of fluid and coupled to a piston plunger longitudinally movable within the reservoir. A needle assembly fits to a distal end of the barrel providing a channel for the fluid to exit an orifice of a needle in the assembly. A dosage knob calibrates a volume of the fluid to be forced through the needle upon the actuation of the plunger. As well, an injection button, upon depression, motivates the plunger towards the assembly. A feedback element fixed to the dosing pen has dual states of an operable state initiated in response to the depression of the button and for a period of time measured by a countdown timer triggered by the depression, and an inoperable state otherwise. Finally, a finger placement sensor at a top surface of the button electrically actuates the feedback element when latched in the operable state.