Removable Injection Pen Monitor Using Magnetic Dose Detection
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Solution Overview
Problem
Existing injection monitoring systems for pen injection devices are bulky, specific to certain brands, prone to electromagnetic interference, and require complex shielding or correction mechanisms, leading to inaccurate dose measurements.
Innovation Solution
A removably attachable injection monitoring module with a hollow main body that co-rotates with the dose setting wheel, incorporating magnetic field producing means and a clutch assembly to detect injection end points, using a magnetic field sensor and gyroscope for precise dose measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic components and sensors are integrated into the pen injection system body, then monitoring functionality is achieved, but the device becomes bulky and unwieldy
Solution Approach 1:
The monitoring system is separated from the pen injection system body into a distinct removable module. This module includes the electronic components, sensors, and processing units, allowing it to be detached when not needed for monitoring, thus maintaining the pen's compactness and ease of use while providing full monitoring functionality when attached.
Solution Approach 2:
A magnetic coupling mechanism serves as an intermediary between the removable monitoring module and the pen injection system. The magnetic field enables wireless or contactless data transfer and synchronization between the module and the pen's internal mechanisms without requiring direct electrical connections or physical integration into the pen body.
2Volume of moving object
If electronic components are miniaturized to reduce bulk, then device compactness is improved, but electromagnetic interference between components increases
Solution Approach 1:
The sensitive sensors are extracted and positioned in a separate removable monitoring module away from the metallic components and electronic circuits in the pen body. This physical separation eliminates electromagnetic interference while maintaining compact dimensions, as the sensors only need to detect magnetic field changes from the dose setting wheel's position.
Solution Approach 2:
Traditional electrical sensors that would be susceptible to electromagnetic interference are replaced with magnetic field sensors (such as Hall effect sensors or magnetometers). These sensors detect the position of the dose setting wheel through magnetic field changes, eliminating the need for direct electrical contacts and reducing electromagnetic interference issues.
3Measurement precision
If sensors are moved away from metallic components to avoid interference, then measurement accuracy is improved, but system complexity increases due to additional correction mechanisms
Solution Approach 1:
The magnetic field sensor system is designed to be inherently immune to electromagnetic interference from metallic components. The sensors passively detect magnetic field changes caused by the dose setting wheel's position without requiring active compensation or correction mechanisms, simplifying the overall system while maintaining high measurement precision.
4Adaptability or versatility
If a removable monitoring module is used, then universal compatibility is achieved, but device complexity increases due to attachment and detachment mechanisms
Solution Approach 1:
The attachment mechanism combines multiple functions into a single integrated solution: mechanical attachment for securing the module, magnetic coupling for data transfer and synchronization, and electrical contacts for power and data communication. This merging reduces the number of separate mechanisms needed while ensuring reliable universal compatibility across different pen injection systems.
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
Provides a compact, universally compatible, and accurate injection monitoring system that minimizes electromagnetic interference, ensuring precise dose detection and user-friendly operation.
Implementation Method 1
an injection monitoring system located within the central longitudinal bore of the main body at the proximal extremity thereof and extending beyond said proximal extremity along said longitudinal axis in a proximal direction
Implementation Method 2
using a magnetic field sensor and gyroscope for precise dose measurement
Data Source
AI summary
An injection monitoring module adapted and configured to be removably attached to a proximal extremity of an injection pen system for delivery of a drug. The monitoring module comprises a hollow main body adapted and configured to be coaxially mounted on, and engage in co-rotation with, a dose setting wheel of the pen injection system, and a central longitudinal bore with a proximal extremity and a distal extremity and an injection monitoring system located in the bore at a proximal extremity thereof. An injection monitoring system is movable within the bore along a central longitudinal axis thereof from a first monitoring position in which the injection monitoring system is not in abutting contact with a proximal surface of an injection activator of the injection pen system, to a second monitoring position in which the injection monitoring system is in abutting contact with the proximal surface of the injection activator.