Infusion Inserter with Dual-Spring Needle Retraction
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Solution Overview
Problem
Existing infusion set inserters are complex and costly, making them difficult for users to handle and dispose of safely, especially when handling and injecting a liquid under sterile conditions.
Innovation Solution
A simple inserter design utilizing two spring units that work together to automatically insert and retract a needle hub, with a carrier body and guiding means within a housing, allowing for easy activation and safe handling, and featuring an adhesive surface for secure attachment to the skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complicated injection apparatus is used to handle and inject liquid under sterile conditions, then the reliability of sterile injection is improved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts the liquid handling function from the injection apparatus by using a separate pre-filled syringe that is simply attached to the needle assembly. The liquid is contained in the syringe barrel rather than being integrated into the injection device itself, simplifying the apparatus while maintaining sterile injection capability.
Solution Approach 2:
The automatic retraction mechanism uses a spring-loaded system that automatically retracts the needle into the syringe barrel after injection, eliminating the need for manual retraction operations and reducing the complexity of control mechanisms while ensuring reliable sterile handling.
2Object-affected harmful factors
If an automatic needle retraction mechanism is implemented, then the safety of needle handling is improved, but the device complexity increases
Solution Approach 1:
The needle hub incorporates an automatic retraction mechanism with a spring-loaded plunger that automatically pushes the needle back into the syringe barrel after injection, making the system self-regulating and eliminating the need for complex external control systems.
Solution Approach 2:
The retraction mechanism is merged with the needle hub assembly itself, combining the plunger, spring, and needle retention functions into a single integrated component rather than using separate mechanisms.
3Ease of operation
If a simple inserter design is used, then the ease of operation and cost-effectiveness are improved, but the reliability of automatic insertion and retraction may be compromised
Solution Approach 1:
The inserter uses a simple push-button activation mechanism that triggers a spring-loaded automatic insertion system, making the device easy to operate while maintaining reliable automatic insertion and retraction functions through the self-actuating spring mechanism.
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 inserter provides a safe, easy-to-use, and cost-effective solution for administering infusion devices, ensuring automatic needle insertion and retraction while maintaining sterility and ease of disposal.
Implementation Method 1
a first spring unit, which, when activated, moves the carrier body, the needle hub and the infusion part forward from a retracted position
Implementation Method 2
a second spring unit, which moves the needle hub away from the carrier body resulting in the retraction of the needle hub
Data Source
AI summary
The invention relates to an inserter for an infusion set for intermittent or continuous administration of a therapeutical substance, such as e.g. insulin. The inserter comprises a needle hub comprising an insertion needle and two spring units assuring automatic insertion and automatic retraction of the insertion needle.The inserter comprises a housing (1), a carrier body (2) carrying an infusion part (8), a needle hub (3), a first moving unit (4) bringing the carrier body (2) to a forward position and a second moving unit (5) bringing the carrier body (2) to a retracted position. The inserter is characterized in that it has means for activation which should be activated at least once in order to bring the carrier body (2) from a retracted to a forward position, and back from the forward to the retracted position.