Medicament Delivery Feedback Mechanism
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Solution Overview
Problem
Existing medicament delivery devices lack effective feedback mechanisms to notify users of the initiation of the medicament delivery process, which can lead to unintended interruption or cessation of the delivery.
Innovation Solution
Incorporating a feedback mechanism within the medicament delivery device that includes a rotator and flexible arm or lever system, which provides audible or tactile feedback when the medicament delivery begins, utilizing a tubular housing and rotator that moves from a first to a second position to disengage from a contact surface, triggering the feedback notification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a feedback mechanism is added to notify users of medicament delivery initiation, then user awareness and confidence are improved, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where a flexible arm or lever provides audible or tactile notification to the user when medicament delivery begins. The flexible arm is positioned to contact a surface at a specific location, creating a detectable signal that confirms delivery initiation, thereby improving user awareness without requiring complex electronic systems.
Solution Approach 2:
The feedback mechanism utilizes the existing mechanical components of the device (flexible arm, plunger rod, drive member) to generate the notification automatically. The flexible arm is pre-positioned and automatically contacts the surface when the plunger rod moves, eliminating the need for external power sources or complex control systems, thus adding reliability without proportionally increasing complexity.
2Measurement precision
If a flexible arm and rotator system is used for feedback, then notification accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The flexible arm is pre-positioned within the device housing during manufacturing, with its free end extending toward the plunger rod's path. The drive member is pre-configured to bias the plunger rod in a specific direction. This preliminary positioning ensures that when the device is activated, the plunger rod automatically contacts the flexible arm at the correct moment, achieving precise notification timing without requiring complex adjustment procedures during assembly.
Solution Approach 2:
The flexible arm serves as an intermediary element between the plunger rod's linear motion and the notification output. As the plunger rod moves axially, it contacts the flexible arm, which then deflects and contacts a surface to generate the audible or tactile signal. This intermediary mechanism translates internal mechanical motion into an external notification with high timing accuracy while using simple, manufacturable components.
3Reliability
If contact surfaces are positioned to disengage at delivery initiation, then feedback reliability is improved, but device complexity increases
Solution Approach 1:
The feedback mechanism is segmented into distinct functional elements: the plunger rod for medicament delivery, the flexible arm for signal generation, and the drive member for biasing. Each component has a specific function and can be independently manufactured and assembled. The contact surfaces are separated into the plunger rod's end surface and the flexible arm's contact surface, allowing for precise positioning and consistent disengagement at delivery initiation without requiring a monolithic complex structure.
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 user notification of the start of medicament delivery, reducing the likelihood of interrupting the process and enhancing user confidence in the device's operation.
Implementation Method 1
The flexible arm can generate feedback upon initiation of the medicament delivery when the rotator reaches the second position
Data Source
AI summary
A start of medicament delivery notification mechanism is presented where the notification mechanism is positioned within a housing of a medical device and includes a rear cap secured to a distal end of the housing, where the rear cap has a hollow tubular housing extending proximally from a distal end of the rear cap such that the tubular housing is cantilevered within and rotatably fixed relative to the housing and is parallel with a longitudinal axis of the housing. A rotator rotatably is positioned around the tubular housing such that rotator can rotate relative to the tubular housing from a first position to a second position, where the second position coincides with an initiation of a delivery of a dose of medicament. The rotator further has a contact surface that engages with and subsequently disengages from a corresponding contact surface located on the rear cap or on an inside surface of the housing.