Stabilized Pen Injector Adhesive Base Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional autoinjectors face challenges in stabilizing the injector during extended bolus delivery, making it difficult for users to maintain the injector immobile for large volume or long duration injections, especially for non-skilled individuals, and in accurately positioning the needle in subcutaneous tissue due to skin deformation.
Innovation Solution
An autoinjector design featuring a syringe with a sterile needle, an adhesive base with a flexible skirt, and a stabilizing mechanism that allows axial movement and angular orientation to secure the injector to the skin, ensuring stability and precise needle placement through a combination of adhesive and mechanical features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the injector is held manually during extended bolus delivery, then the injection can be administered, but the injector becomes unstable and difficult to maintain in an immobile position
Solution Approach 1:
A stabilizing adapter is introduced as an intermediary device between the injector and the patient's body. The adapter includes a stabilizing element with skin-contacting surfaces that attach to the patient, providing a stable base for the injector during extended bolus delivery. This mediator transfers the injector from manual holding to stable positioning on the patient's body.
Solution Approach 2:
The stabilizing element extends the functional interface from the traditional handheld dimension to a body-mounted dimension. By providing skin-contacting surfaces that attach to the patient's body, the system transitions from one-dimensional manual control to a stable multi-dimensional positioning system that maintains injector orientation during prolonged administration.
2Measurement precision
If the needle is positioned in subcutaneous tissue, then injection is achieved, but skin deformation makes accurate positioning difficult
Solution Approach 1:
The stabilizing element provides localized support at the injection site through skin-contacting surfaces. By stabilizing the specific region where the needle enters the subcutaneous tissue, the system compensates for surrounding skin deformation and maintains accurate needle positioning throughout the injection process.
Solution Approach 2:
The stabilizing element is attached to the patient's body before needle insertion. This preliminary stabilization of the skin and tissue at the injection site prevents deformation during the procedure, ensuring accurate needle positioning in the subcutaneous tissue from the outset.
3Stability of the object's composition
If a stabilizing adapter is added to the injector, then injector stability is improved, but the device complexity increases
Solution Approach 1:
The stabilizing adapter is designed as a separate, modular component that can be attached to the injector. This segmentation allows the stabilizing function to be added independently from the injector itself, maintaining the simplicity of the original device while providing enhanced stability through an optional accessory.
Solution Approach 2:
The stabilizing adapter is designed to be compatible with multiple injector types and configurations. By creating a universal stabilizing solution that can attach to various injectors, the system adds stability functionality without requiring complex customizations for each specific injector model.
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 solution provides enhanced stability for extended injection periods, reduces skin deformation issues, and facilitates accurate needle placement, enabling efficient delivery of larger volumes and longer duration injections, even for users with limited dexterity.
Implementation Method 1
an adhesive base having an aspect ratio of a long axis to a short axis of at least 1.5 to 1; the adhesive base being attached movably to the hollow needle
Data Source
AI summary
An injector device for medical use includes a needle, a barrel in fluid communication with the needle, and a plunger sealing the barrel's proximal end. The injector device further includes a needle cover, a housing with a channel, and an adhesive base for securing the injector to a patient's skin. The housing channel has openings for the barrel and needle. A handle and coupler mechanism facilitate the removal of the needle cover and adhesive cover from the adhesive base. An assembly method involves installing the barrel into the distal housing channel, ensuring fluid communication with the needle, sealing the barrel's proximal end with a plunger, and coupling the distal housing to a proximal housing. The handle is then pulled to remove the adhesive cover and needle cover from the adhesive base, preparing the injector for use.