Additive Force Device for Intradermal Injection Backpressure
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Solution Overview
Problem
Existing drug delivery pens require excessive force to overcome high backpressure during intradermal injections, making the process difficult for users.
Innovation Solution
An additive force device with a torsion or compression spring is integrated into the drug delivery pen, storing energy that is released when the user's force exceeds a predetermined value, amplifying the injection force to facilitate intradermal medication delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a drug delivery pen is designed for intradermal injection, then the injection depth control is improved, but the force required to overcome backpressure increases excessively
Solution Approach 1:
The spring mechanism is pre-loaded before injection to store elastic potential energy. When the user activates the pen, this pre-stored energy is released to provide the additional force needed to overcome intradermal backpressure, eliminating the need for the user to manually generate excessive force.
Solution Approach 2:
The spring acts as an intermediary mechanical element between the user's input force and the plunger. It amplifies the user's force by converting pre-stored elastic energy into additional mechanical work, thereby reducing the direct force burden on the user while achieving the required injection pressure.
2Ease of operation
If the pen needle assembly is made thinner for less painful injection, then the ease of operation is improved, but the structural strength decreases
Solution Approach 1:
The needle assembly is segmented into distinct functional components (needle hub, shaft, bevel) that can be independently optimized. This allows the needle to be thin for patient comfort while the hub and connection mechanisms maintain sufficient structural strength to handle the amplified forces from the spring mechanism.
Solution Approach 2:
The force distribution in the needle assembly is made asymmetric, with the majority of structural strength concentrated in the hub and connection points that experience highest stress, while the needle shaft itself remains thin for patient comfort. The spring force is applied asymmetrically through the plunger mechanism to minimize lateral stresses on the thin needle.
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
The device significantly reduces the user's required force for intradermal injections by providing additional force when needed, making the injection process easier and more efficient.
Implementation Method 1
An additive force device with a torsion or compression spring is integrated into the drug delivery pen, storing energy that is released when the user's force exceeds a predetermined value
Data Source
AI summary
A method of amplifying an injection force of a drug delivery device, comprising the steps of storing energy in an additive force device, connecting the additive force device to the drug delivery device, setting a dose of medicament to be administered, and selectively releasing the stored energy of the additive force device to amplify an injection force of the drug delivery device.