Wireless IC Tag on Metal Medical Instrument
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wireless IC tags attached to metal medical instruments face challenges in achieving a balance between widening the communication band and increasing the communication distance, as altering the attachment method affects the resonant frequency and Q-factor of the resonant circuit, limiting the degree of freedom in attachment methods.
Innovation Solution
A wireless IC tag-attached metal medical instrument with a resonant circuit featuring an inductor of spiral or helix shape, electrically connected to a wireless IC chip, establishes electric field, magnetic field, or electromagnetic field coupling with the metal portion of the instrument, allowing for flexible attachment methods such as resin adhesive or welding, while maintaining a wide communication band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the Q-factor of the resonant circuit is decreased to widen the communication band, then the communication band width is improved, but the communication distance decreases
Solution Approach 1:
The patent applies parameter changes by intentionally decreasing the Q-factor of the resonant circuit to widen the communication band. This is achieved by designing the resonant circuit with specific component values (inductance L and capacitance C) that result in a lower Q-factor, thereby expanding the frequency range over which communication can occur, even though this reduces the communication distance.
2Adaptability or versatility
If the attachment method of the wireless IC tag is changed, then the degree of freedom in attachment is improved, but the resonant frequency of the resonant circuit varies
Solution Approach 1:
The patent accepts and utilizes parameter changes in resonant frequency caused by different attachment methods. Instead of trying to maintain a fixed resonant frequency, the system is designed to operate effectively across a range of frequencies by widening the communication band through reduced Q-factor, thereby accommodating variations in attachment methods (welding, resin adhesive, etc.).
Solution Approach 2:
The patent converts the harmful effect of resonant frequency variation caused by different attachment methods into a benefit. By widening the communication band, the system can tolerate and even utilize the frequency shifts that occur with different attachment methods, transforming what was previously a problem into an acceptable characteristic of the system.
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 enhances the degree of freedom in attaching wireless IC tags, ensures easy attachment, and maintains communication capabilities even when the resonant frequency varies, by decreasing the Q-factor and widening the communication band, thus prioritizing communication band width over distance.
Implementation Method 1
electric field coupling, magnetic field coupling, or electromagnetic field coupling is established between the resonant circuit and the metal portion
Implementation Method 2
electric field coupling, magnetic field coupling, or electromagnetic field coupling is established between the resonant circuit and the metal portion
Implementation Method 3
electric field coupling, magnetic field coupling, or electromagnetic field coupling is established between the resonant circuit and the metal portion
Implementation Method 4
the resonant circuit... has a predetermined resonant frequency... emits a transmission signal, which has a frequency equal to the predetermined resonant frequency
Data Source
AI summary
A wireless IC tag-attached metal medical instrument includes a metal medical instrument including a metal portion. The metal medical instrument is configured such that electric, magnetic, or electromagnetic field coupling is established between a resonant circuit and the metal portion when a wireless IC tag is fixed to the metal portion that includes the resonant circuit having an inductor with a spiral or helix shape that turns around a central axis more than one turn. In this configuration, the metal portion either emits a transmission signal with a frequency equal to a resonant frequency of an electromagnetic wave supplied from the resonant circuit or receives a reception signal having a frequency equal to the resonant frequency, and supplies the reception signal to the resonant circuit.