Cannula Insertion Mechanism Fusible Blocking Element
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Solution Overview
Problem
Existing cannula insertion mechanisms lack secure, automatic, and reliable methods for inserting cannulas into the body, particularly for extended periods and under varying conditions, with a need for improved safety and reduced space requirements for the retaining mechanism.
Innovation Solution
A cannula insertion mechanism featuring a movable cannula holder with an energy accumulator, such as a spring, and a fusible or softenable blocking element that can be triggered electrically to automatically insert the cannula, ensuring secure storage and assembly while allowing for automatic and immune insertion even under accelerations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical blocking element is used to retain the cannula holder, then secure storage is achieved, but the space requirement for the retaining mechanism increases
Solution Approach 1:
The blocking element is integrated into the cannula holder structure itself, combining the retaining function with the holder structure. This eliminates separate retaining components and reduces overall space requirements while maintaining secure blocking functionality during storage
Solution Approach 2:
The blocking element serves multiple functions: it retains the cannula holder during storage, acts as a trigger mechanism for insertion, and provides structural support. This multi-functionality reduces the need for additional dedicated retaining components, thereby reducing space requirements
2Reliability
If a complex retaining mechanism is used to ensure secure triggering, then reliability is improved, but device complexity increases
Solution Approach 1:
The complex mechanical retaining mechanism is replaced by extracting only the essential blocking function and implementing it through a simple fusible element combined with electrical triggering. This removes unnecessary mechanical complexity while maintaining secure triggering reliability
Solution Approach 2:
The mechanical blocking and triggering mechanism is replaced with a system using a fusible element that responds to thermal or electrical stimuli. This substitution eliminates complex mechanical linkages, springs, and levers while achieving reliable triggering through a simpler physics-based mechanism
3Extent of automation
If a mechanical spring-based insertion mechanism is used, then automatic insertion is achieved, but immunity to accelerations during falls or impacts is reduced
Solution Approach 1:
The mechanical spring-based automatic insertion mechanism is replaced with a system using a fusible element that melts or softens in response to thermal or electrical stimuli. This substitution eliminates the sensitivity of mechanical springs to external accelerations and impacts, providing reliable automatic insertion even during falls or impacts
Solution Approach 2:
The triggering mechanism changes from relying on mechanical force parameters (spring compression, mechanical leverage) to relying on thermal or electrical parameters (temperature change, electrical current). This parameter change makes the system immune to mechanical accelerations while maintaining automatic insertion capability
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 mechanism provides secure, automatic, and reliable cannula insertion with enhanced safety and reduced space requirements, ensuring consistent performance even under conditions like falls or extended use, while maintaining assembly safety and efficiency.
Implementation Method 1
a fusible or softenable blocking element that can be triggered electrically to automatically insert the cannula
Implementation Method 2
triggered electrically
Data Source
AI summary
An insertion mechanism for a cannula includes a cannula housing, a displaceable cannula, at least one cannula holder, an insertion spring, a triggering element, and a safety device. The safety device, in a secured state, holds the triggering element in a blocked position against a force of the insertion spring and, in a released state, releases the triggering element such that the triggering element is movable into a release position by the force of said insertion energy store and the at least one cannula holder is able to move relative to the cannula housing, driven by the insertion energy store, so as to trigger or implement an insertion movement or insertion. To reach the released state, the safety mechanism is heatable by a heating element and softened and/or weakened with respect to its mechanical carrying or holding capacity, or severed or at least partially or completely melted.