Transdermal Injection System With Independent Pump Actuation
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Solution Overview
Problem
Existing drug administration devices face limitations in controlling needle and cannula actuation independently of the pump operation, leading to reduced motorized stroke efficiency and increased power consumption, and require precise movement control to avoid unintended triggering.
Innovation Solution
A transdermal drug administration device with a housing, reservoir, pump system, and electronic control system, featuring a connection means that allows independent control of pumping and injection functions, using a cam element and pre-loaded spring for sequential needle and cannula movement, and a locking device to prevent interaction with the piston during the entire stroke.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the needle and canula actuation mechanism is integrated with the pump operation, then the device structure is simplified, but the motorized stroke efficiency is reduced and power consumption increases
Solution Approach 1:
The patent divides the actuation mechanism into separate functional modules: a pump mechanism for fluid delivery and a separate needle/cannula actuation mechanism. This segmentation allows the piston stroke to be fully utilized for pumping without being constrained by injection system requirements, thereby improving motorized stroke efficiency and reducing power consumption while maintaining structural organization through modular design.
Solution Approach 2:
The patent introduces a connection means as an intermediary element between the pump piston and the injection system. This connection means can be positioned to allow full piston stroke for pumping operations, and only engages the injection system when needed, enabling independent optimization of pumping efficiency and injection timing without compromising either function.
2Device complexity
If the needle and canula actuation mechanism is integrated with the pump operation, then the device structure is simplified, but the motorized stroke efficiency is reduced
Solution Approach 1:
The patent separates the pump actuation from the injection actuation, allowing the piston to complete its full stroke for pumping without being limited by the need to trigger injection mechanisms. This segmentation enables the motorized stroke to be fully utilized for fluid delivery, maximizing productivity while maintaining a organized device structure through functional separation.
Solution Approach 2:
The patent implements a dynamic connection means that can be positioned in different states: engaged to trigger injection when needed, and disengaged to allow full piston stroke for pumping. This dynamic positioning enables the system to adapt between injection mode and pumping mode, optimizing motorized stroke efficiency while maintaining structural integrity through controlled mechanical engagement.
3Reliability
If precise movement control is implemented to avoid unintended triggering, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The connection means serves as a mechanical intermediary that provides precise control through its positioning and engagement characteristics. The designed geometry and positioning mechanisms of the connection means ensure that the injection system is triggered only when the piston reaches the appropriate position, providing reliable control without requiring complex electronic or mechanical control systems.
Solution Approach 2:
The patent replaces complex electronic control systems with a purely mechanical solution using the connection means and piston geometry. The mechanical design inherently provides precise control through the physical relationship between the piston stroke and the triggering mechanism, eliminating the need for sensors, motors, or electronic controllers while maintaining high reliability.
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 full utilization of the piston stroke for pumping, reduces power consumption, and ensures precise control over needle and cannula movements, enhancing device efficiency and safety.
Implementation Method 1
a pre-loaded spring for sequentially actuating the needle and canula through the cam element mechanism
Data Source
AI summary
A device for transdermal drug administration comprises a housing, a lower casing of the housing defining a cutaneous connection surface having an opening for the passage of a transdermal injection canula, a reservoir containing an active ingredient intended to be administered, a pump system comprising a pump body, a valve piston and/or a pump piston that can be moved in the pump body by at least one drive system, a transdermal injection system and an electronic control system. The injection system is controlled by a translational element interacting with a connection means inserted between the pump piston or the motorized valve piston on one side and the injection system on the other side, the connection means being movable between a first position that it occupies until the injection system is activated and a second, irreversible retracted position into which it is switched by the triggering of the injection system.