MRI Calling Device Using RFID Wireless Signal Transmission
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Solution Overview
Problem
Existing calling devices in magnetic resonance imaging systems are prone to mechanical failure due to broken or squeezed air hoses, leading to unreliable alarm triggering during examinations.
Innovation Solution
A calling device utilizing RFID technology with a reader/writer and a call maker that generates radio-frequency signals through an antenna, allowing for wireless interconnection and reliable operation, including a switchable circuit and return spring mechanism to ensure consistent signal transmission and fault detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an air hose is used to transmit air pressure from the squeezing ball to the electronic pressure sensor, then the calling device can be implemented with simple components, but the air hose is easily broken or mechanically squeezed, resulting in transmission failure and unreliable alarm triggering
Solution Approach 1:
The patent replaces the mechanical air hose transmission system with an RFID wireless communication system. The call maker generates RF signals that are received by the reader/writer, eliminating the need for physical air hoses and electronic pressure sensors. This substitution resolves the contradiction by maintaining simple device structure while dramatically improving reliability through contactless signal transmission that cannot be mechanically damaged.
Solution Approach 2:
The patent introduces an RFID field as an intermediary medium to transmit signals between the call maker and the reader/writer. Instead of direct mechanical or electrical connections, the RF field serves as a non-contact mediator that carries alarm signals through the detection area, solving the reliability issue of physical hose connections while keeping the system structure relatively simple.
2Reliability
If a wireless RFID system is used for signal transmission, then mechanical failures are eliminated and reliability is improved, but the device requires additional components such as reader/writer and antenna
Solution Approach 1:
The reader/writer unit serves multiple functions: it generates the RF electromagnetic field for communication, receives alarm signals from the call maker, and can potentially perform other detection or control functions within the MRI system. This multi-functionality justifies the added component by consolidating several system roles into a single device, thereby improving reliability without proportionally increasing overall system complexity.
Solution Approach 2:
The call maker is designed as a passive or semi-passive device that utilizes the RF electromagnetic field already present in the MRI detection area to power its operation and generate alarm signals. This self-service approach eliminates the need for separate power sources or complex circuitry in the call maker, offsetting the complexity added by the reader/writer unit and improving overall signal transmission reliability.
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 solution provides high reliability by enabling timely operator intervention in case of device faults, avoiding mechanical failures and ensuring uninterrupted examinations through wireless communication and robust signal transmission.
Implementation Method 1
The antenna is arranged on the main body and can generate an induced current after receiving the foregoing fixed-frequency electromagnetic wave
Implementation Method 2
The reader/writer can send a fixed-frequency electromagnetic wave to form a radio-frequency electromagnetic field in a detection area of the magnetic resonance imaging system
Data Source
AI summary
A calling device of a MRI system may include a reader/writer and a call maker. The reader/writer can send a fixed-frequency electromagnetic wave. The call maker may include a main body, an antenna, an operating member, and an answering controller. The antenna can generate an induced current after receiving the fixed-frequency electromagnetic wave. The operating member can switch between first and second positions relative to the main body. The answering controller is configured such that: when the operating member is in the first position, a first radio-frequency signal is sent through the antenna with energy obtained from the induced current generated by the antenna, and when the operating member is in the second position, a second radio-frequency signal is sent through the antenna with energy obtained from the induced current generated by the antenna. The reader/writer can send different prompt signals according to the first and second radio-frequency signals.