Medicament Delivery Device Actuator Guide Mechanism
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Solution Overview
Problem
Existing medicament delivery devices are prone to overdosing when used by inexperienced users or in stressful situations, as they require manual actuation and can be inadvertently reset, leading to incomplete or incorrect dosing.
Innovation Solution
A medicament delivery device with a biased actuator member and actuator guide member that prevents subsequent dosing until the previous dose is fully administered, featuring guide surfaces and a locking mechanism to ensure accurate and complete delivery, along with audible and tactile feedback for user confirmation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a manual actuator button is used for dose delivery, then the device is simple to operate, but the user may inadvertently release or reset the button during delivery, causing overdose or incomplete dosing
Solution Approach 1:
The device incorporates audible and tactile feedback mechanisms that provide real-time confirmation to the user during dose delivery. The guide member engages with guide surfaces to produce distinct tactile sensations and audible clicks that indicate the delivery status, preventing user confusion about whether the dose is complete or if the device has been reset.
Solution Approach 2:
A guide member is introduced as an intermediary component between the actuator button and the dosing mechanism. This guide member interacts with guide surfaces to control the actuator's movement, ensuring that the button can only be pressed in specific sequences and preventing inadvertent resets or premature dose initiation.
2Adaptability or versatility
If the actuator button can be pressed multiple times, then the device allows flexible dosing, but it may lead to repeated dosing errors and overdose in inexperienced users
Solution Approach 1:
The device employs dynamic control of the actuator button through the guide member and guide surface interaction. The button's pressability changes dynamically based on the dosing state - it can be pressed to initiate a dose, but becomes unpressable or produces feedback signals when a dose is already in progress or has been completed, preventing repeated erroneous presses.
Solution Approach 2:
Audible and tactile feedback signals are provided continuously during the dosing process to inform the user of the current state. When the dose is complete or interrupted, the feedback mechanism signals this status, preventing the user from mistakenly pressing the button again for another dose.
3Productivity
If the device provides continuous dosing capability, then it delivers medication efficiently, but it may confuse users with ambiguous feedback about dose completion status
Solution Approach 1:
The device provides continuous, unambiguous feedback through the guide member's interaction with guide surfaces. Each phase of the dosing process produces distinct audible clicks and tactile sensations that clearly indicate whether the dose is ongoing, complete, or has been interrupted, eliminating user confusion about the current state.
Solution Approach 2:
While not literally using color changes, the device employs distinct sensory signals (audible and tactile) that provide clear visualizable feedback about the dosing state, similar to how color changes provide status information. The feedback mechanism ensures the user can clearly distinguish between different dosing phases.
Data Source
AI summary
The present invention relates to a medicament delivery device for delivering a number of predetermined amounts of medicament, comprising a body having a proximal and an opposite distal end and extending along a longitudinal axis (L); a medicament container (20) arranged inside said body; a driving mechanism arranged inside said body and configured to act on said medicament container; a manually movable activation member (102) arranged on the distal end the body; a biased actuator member (64) arranged to be movable along the longitudinal axis and through the manually movable activation member (102), said biased actuator member being configured to protrude a predetermined distance from the distal end of the manually movable activation member and configured to interact with said driving mechanism when the biased actuator member is displaced said predetermined distance towards the proximal end of the body for delivering a predetermined amount of medicament; and an actuator guide member (90) arranged in the body and configured to interact with the manually movable activation member (102) and with the biased actuator member (64) such that said actuator guide member (90) can be held in a position within the body and released from said position after a predetermined amount of medicament is delivered; wherein the actuator guide member (90) comprises at least one second guide element (92) adapted to interact with blocking surfaces in at least one group of guide surfaces (76) arranged on the outer circumferential surface of the biased actuator member (64) if said biased actuator member is operated towards the proximal end of the body during displacement of the biased actuator member (64) from the distal end of the manually movable activation member or if said biased actuator member is released during displacement of the biased actuator member (64) towards the proximal end of the body.