Medicament Delivery Device With Manual Speed Control
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Solution Overview
Problem
Existing medicament delivery devices lack user control over the delivery sequence, particularly in terms of speed and pause functionality, and rely on electric power, which can lead to device failure and increased costs.
Innovation Solution
A medicament delivery device with a manually operable controller featuring a scroll wheel segment that allows for control over the delivery speed and pause functionality, utilizing a power source like a spirally wound compression spring, enabling users to control the delivery speed from maximum to zero without the need for electric power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an electrically driven delivery mechanism is used to allow speed control, then the user can control the delivery speed and pause the injection, but the device becomes dependent on electric power and more expensive
Solution Approach 1:
The patent replaces the electrical motor system with a purely mechanical spring-driven system. The compression spring provides the driving force, and mechanical elements including a ratchet mechanism, pawl, and adjustable speed control components regulate the plunger rod's movement. This substitution eliminates battery dependence while maintaining speed control capability through mechanical means.
Solution Approach 2:
The compression spring automatically winds itself during the injection process, storing mechanical energy that drives the plunger rod. The spring's inherent elastic properties provide continuous power without external energy sources, making the system self-sufficient and eliminating the need for electric power or battery replacement.
2Ease of operation
If an electrical motor with speed control is used, then the injection speed can be regulated, but the device complexity and cost increase
Solution Approach 1:
The patent replaces complex electrical motor control systems with simple mechanical speed control mechanisms. These include adjustable ratchet teeth, pawl positions, and friction elements that mechanically regulate the plunger rod's descent speed. The control is achieved through the user's manual manipulation of these mechanical components rather than electronic circuitry.
3Device complexity
If a purely mechanical spring-driven system is used, then the device is simpler and does not require electric power, but the user cannot control the delivery speed or pause the injection
Solution Approach 1:
The patent introduces dynamic control elements to the mechanical system, including an adjustable ratchet mechanism and movable pawl that allow the user to regulate the plunger rod's speed during injection. These components enable real-time adjustment of delivery parameters while maintaining the overall mechanical simplicity of the spring-driven architecture.
Solution Approach 2:
The delivery mechanism is segmented into controllable sections: the spring drive unit, the ratchet mechanism with adjustable teeth, the pawl, and the plunger rod. This segmentation allows independent control of speed and pause functions through specific mechanical components without complicating the entire system.
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
Enables user-controlled medicament delivery speed and pause functionality, ensuring continuous dosing even without electric power, improving ergonomics and reducing device costs.
Implementation Method 1
a power source arranged in said medicament delivery drive unit, wherein the power source is a spirally wound compression spring
Data Source
AI summary
The present invention relates to a medicament delivery device (10) comprising a housing (12, 14); a medicament container (22) arranged inside the housing; a medicament delivery drive unit comprising a plunger rod (28) acting on said medicament container (22) and a power force (26) capable of driving said plunger rod (28) for delivering a dose of medicament. The invention is characterised in a delivery controller (30) comprising a manually operable release mechanism (30, 36) for releasing said plunger rod (28) and said power source (26) for delivering a dose of medicament and a manually operable control speed mechanism (30, 38) capable of controlling the speed of the released plunger rod and thereby the medicament delivery speed.