Stabilized Pen Injector Adaptor for Extended Bolus Delivery
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Solution Overview
Problem
Conventional medical injectors face challenges in stabilizing the device during extended bolus delivery, making it difficult for users to hold 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 hollow needle connected to a drug container, an adhesive base with a flexible skirt for stabilization, and a mechanism for axial movement and angle adjustment to ensure proper skin contact and needle placement, along with a stabilizing adapter for extended use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If conventional medical injectors are used for extended bolus delivery, then injection capability is provided, but device stability deteriorates making it difficult for users to hold the injector immobile
Solution Approach 1:
A stabilizing adapter is introduced as an intermediary component between the injector and the patient's body. The adapter includes a stabilizing element that contacts the patient's body to prevent movement of the injector during extended bolus delivery, thereby maintaining device stability while enabling longer injection durations.
Solution Approach 2:
The injection system is divided into separate functional components: the injector unit, the stabilizing adapter, and the stabilizing element. This segmentation allows the stabilizing functionality to be added independently without modifying the core injector mechanism, enabling extended use while maintaining stability.
2Measurement precision
If conventional injectors are used for subcutaneous injection, then needle delivery is achieved, but positioning accuracy deteriorates due to skin deformation
Solution Approach 1:
The stabilizing element is applied to the patient's body before needle insertion to pre-stabilize the skin and tissue. This preliminary stabilization prevents skin deformation during the injection process, ensuring accurate needle positioning in subcutaneous tissue throughout the extended bolus delivery.
3Adaptability or versatility
If injectors are designed for standard use, then basic injection function is provided, but adaptability deteriorates for extended use with viscous medications
Solution Approach 1:
The injection system is segmented into a standard injector unit and a separate stabilizing adapter. This allows the basic injector to remain simple while the adapter provides additional functionality for extended bolus delivery with viscous medications, enhancing adaptability without significantly increasing overall device complexity.
Solution Approach 2:
The stabilizing adapter is designed to be universally compatible with various injector types, enabling the same adapter to enhance multiple different injector devices for extended bolus delivery applications, thereby improving adaptability across different medical contexts.
Data Source
AI summary
An autoinjector including a syringe, a driver for driving the plunger of the syringe and a stabilizing adaptor for holding the injector on the skin of a patient is provided. The stabilizing adaptor has an adhesive base with a long axis to short axis ratio of at least 1.5 to 1. The syringe is orientated with its axis at an angle of between 60 and 120 degrees to the base during operation of the autoinjector.