Eccentric Wheel Insertion Mechanism for Controlled Cannula Retraction
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Solution Overview
Problem
Existing insertion devices for medical devices, such as analyte sensors and infusion devices, require complex designs and high manufacturing costs due to the need for separate actuators or mechanisms to control the insertion and retraction of cannulas, leading to inefficiencies and increased costs.
Innovation Solution
An insertion device with a simplified design utilizing a housing, a holding structure, an insertion tool, a wheel with a guiding structure, and a torsional drive to facilitate controlled insertion and retraction of medical devices, eliminating the need for separate actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate actuators or mechanisms are used to control insertion and retraction of cannulas, then reliability of insertion is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent combines the insertion and retraction functions into a single integrated mechanism. The insertion device uses one actuator that performs both the insertion stroke and the retraction stroke through a unified mechanical system, eliminating the need for separate actuators for each function. This merging reduces device complexity while maintaining reliable insertion and retraction capabilities.
Solution Approach 2:
The single actuator mechanism is designed to perform multiple functions: it provides both the insertion motion and the retraction motion. The mechanical system is configured so that one actuator can deliver the cannula into the tissue and then retrieve it, making the actuator universal for both insertion and retraction operations, thereby reducing overall device complexity.
2Manufacturing precision
If separate actuators or mechanisms are used to control insertion and retraction of cannulas, then control precision is improved, but manufacturing costs increase
Solution Approach 1:
By merging the control functions into a single actuator system, the patent reduces the number of components that need to be manufactured and assembled. This consolidation maintains control precision through a well-designed mechanical system while significantly reducing manufacturing costs associated with multiple separate actuators and their interconnections.
3Ease of operation
If complex designs with separate actuators are used, then insertion control is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent integrates insertion and retraction control into a single actuator mechanism, simplifying the manufacturing process by reducing the number of parts and assembly steps. The unified design maintains precise insertion control through careful mechanical design while making the device easier and less costly to manufacture compared to systems with separate actuators.
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 simplified design reduces manufacturing costs and complexity while ensuring reliable insertion and retraction of medical devices, such as analyte sensors and infusion devices, into body tissue.
Implementation Method 1
at least one torsional drive configured for rotating the wheel upon activation
Data Source
AI summary
An insertion device for inserting at least an insertable part of a medical device into a body tissue of a subject is proposed, that includes: at least one housing with at least one holding structure adapted to releasably receive the medical device, at least one insertion tool configured for inserting at least the insertable part of the medical device, at least one wheel comprising a guiding structure configured for guiding an axial movement of the insertion tool and the holding structure between a distal position and a proximal position, and at least one torsional drive configured for rotating the wheel upon activation, wherein the guiding structure comprises a shape with an eccentricity relative to a center of the wheel and/or relative to a turning point of the wheel, wherein the eccentricity is unequal to zero, and wherein the shape is configured to slow a linear movement around a turning point of the insertion tool.