Magnetic Reed Switch Door Lock Detection for Dialysis Safety
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Solution Overview
Problem
Existing door locking state detection systems in blood treatment devices, such as dialysis machines, fail to accurately recognize whether a door is fully closed and locked, leading to potential safety issues like leakage and burn risks due to susceptibility to temperature, staining, and mechanical wear, and often require complex and power-dependent circuitry.
Innovation Solution
A locking state recognition apparatus using a magnet and sensor combination where the sensor is permanently switched by the magnet, with a clearance between them, and a ferromagnetic locking bar that interrupts the magnetic field only when properly closed, ensuring safe detection of a locked state without elaborate hardware or power supply, and alerting for incomplete closure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If hall effect sensors are used for door closed detection, then switching precision is improved, but device complexity and cost increase due to power supply requirements and temperature susceptibility
Solution Approach 1:
The patent replaces electronic sensors (hall effect sensors) with a purely mechanical detection system. A magnet is permanently mounted on the door, and a reed switch is fixed on the device housing. When the door closes, the magnet triggers the reed switch mechanically through magnetic field interaction, eliminating the need for complex electronic circuits and power supply while maintaining reliable detection.
Solution Approach 2:
The patent uses inexpensive, simple components (magnet and reed switch) that have long operational life and no power requirements. These passive components are more reliable than active electronic sensors because they have no power supply needs and are not susceptible to temperature changes, effectively replacing expensive and complex electronic systems with simple, durable mechanical-magnetic components.
2Measurement precision
If electronic sender-receiver systems are used for door detection, then detection capability is improved, but reliability deteriorates due to susceptibility to staining, aging, and light interference
Solution Approach 1:
The patent replaces optical or electronic sender-receiver systems with a magnetic field-based mechanical switch. The magnet permanently mounted on the door and the reed switch on the housing create a contactless mechanical-magnetic coupling that is immune to staining, aging, and light interference. This substitution of electronic/optical systems with magnetic-mechanical components ensures long-term reliability.
3Ease of operation
If micro switches are used for door closed detection, then switching function is improved, but reliability worsens due to mechanical wear and membrane rupture over time
Solution Approach 1:
The patent replaces contact-based mechanical micro switches with a contactless magnetic field-based reed switch system. The magnet on the door actuates the reed switch on the housing through magnetic field interaction without physical contact. This eliminates mechanical wear and membrane rupture issues, significantly extending the operational lifespan while maintaining the switching function.
4Measurement precision
If elaborate circuitry with power supply is used for accurate door detection, then measurement precision is improved, but energy consumption increases
Solution Approach 1:
The patent creates a passive detection system where the magnet permanently mounted on the door serves as both the actuator and the signal source. The reed switch on the housing is triggered automatically by the magnet's magnetic field when the door closes, requiring no external power supply. The system is self-powered by the magnetic field interaction itself, eliminating energy consumption while maintaining reliable detection accuracy.
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
Ensures safe and reliable recognition of a locked door state, independent of temperature and staining, with simple circuitry and no need for power, preventing accidental openings and maintaining device safety by requiring complete locking for operation.
Implementation Method 1
a magnet (6) as a magnetic means disposed on or at a first portion (2) of a casing
Implementation Method 2
a ferromagnetic locking bar that interrupts the magnetic field
Implementation Method 3
a ferromagnetic locking bar that interrupts the magnetic field only when properly closed
Data Source
AI summary
A locking state detector comprises a magnet disposed at a first portion of a casing which has an opening that is lockable with an opening locking means. A detector is disposed at a second portion of the casing, the second portion being spaced apart from the first portion such that a clearance between the first and second portions is formed. An interfering component is fixed to an interfering component pivoting means, which is disposed in the opening locking means and arranged to pivot into the clearance and out of the clearance when the interfering component pivoting means is rotated. The detector is arranged to detect a locked state and a non-locked state of the opening locking means in cooperation with the magnet and the interfering component, and to indicate the detected state for subsequent processing.