Segmented Ring Antenna for Medical Handpiece RFID Integration
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Solution Overview
Problem
Current ultrasonic medical devices face limitations in precision and safety due to insufficient oscillatory amplitudes in insert tips, particularly in dental implantology, and existing RFID systems for insert tips suffer from signal attenuation and complexity, making effective communication and sterilization challenging.
Innovation Solution
A handpiece assembly with a miniaturized RFID system and antenna design that minimizes the increase in insert tip diameter, using a ferromagnetic layer to reduce electromagnetic field distortion, and a segmented ring antenna for improved communication, ensuring reliable identification and operation within the UHF frequency range without the need for radiofrequency connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If a traditional RFID system is integrated into the insert tip, then identification capability is improved, but signal attenuation and electromagnetic field distortion occur due to metal interference
Solution Approach 1:
A ferromagnetic layer is introduced as an intermediary component between the metal insert tip body and the RFID antenna. This layer acts as a shield that prevents direct interaction between the electromagnetic field and the conductive metal surface, thereby reducing signal attenuation and electromagnetic distortion while maintaining identification capability.
Solution Approach 2:
The insert tip structure combines multiple materials with different electromagnetic properties: a non-conductive ferromagnetic layer is applied over the conductive metal body. This composite structure leverages the magnetic shielding properties of the ferromagnetic material to protect the RFID system from metal-induced interference.
2Loss of information
If the insert tip diameter is increased to accommodate RFID components, then identification functionality is improved, but the increase obstructs the clinician's vision and affects mechanical properties
Solution Approach 1:
The RFID antenna is integrated within the existing insert tip structure by nesting it into the hollow cavity of the insert body. The ferromagnetic layer and antenna components are positioned inside the insert tip's internal space, allowing RFID functionality to be added without increasing the external dimensions of the insert tip.
Solution Approach 2:
Instead of adding RFID components radially outward which would increase diameter, the antenna is positioned along the longitudinal axis within the insert tip's length. This dimensional reorganization allows RFID integration while maintaining the original radial profile and mechanical properties of the insert tip.
3Length of moving object
If a miniaturized RFID system is used, then insert tip diameter increase is minimized, but communication reliability in UHF frequency range becomes challenging
Solution Approach 1:
The RFID antenna is designed with specific electrical parameters (inductance, capacitance, resonant frequency) optimized for UHF communication. By carefully selecting and tuning these electrical parameters, reliable communication is achieved despite the miniaturized physical dimensions of the antenna within the constrained insert tip space.
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 precision and safety of ultrasonic medical devices by maintaining oscillatory amplitude and mechanical properties, ensuring effective RFID communication and easy sterilization, while providing secure traceability and predictive maintenance capabilities.
Implementation Method 1
a ferromagnetic layer (6), arranged on the side of said insert metal tang (5) of the insert (2)... adapted to reduce or cancel phenomena of attenuation and/or distortion of the electromagnetic field caused by field parasite effects in the vicinity of the insert antenna (8) due to the interaction of a transmitted/received electromagnetic field with metal parts
Implementation Method 2
a dielectric layer (7), arranged in contact with the aforesaid ferromagnetic layer (6)... adapted to reduce or cancel phenomena of attenuation and/or distortion of the electromagnetic field
Implementation Method 3
an insert antenna (8), arranged in contact with the aforesaid dielectric layer (7) and comprising an insert antenna metal element (9), which extends along a predefined, essentially planar profile P... configured to receive and transmit electromagnetic fields, either modulated or non-modulated, within a given frequency range
Implementation Method 4
a transducer (25), e.g., a piezoelectric transducer... adapted to put said insert (2) into resonance
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A handpiece assembly for medical device is described, comprising a handpiece (4) for medical device, comprising a distal handpiece portion (22) adapted to receive an insert tip assembly (1) comprising a radiofrequency identifier (3), an insert tip antenna (8) and an insert tip (2) adapted to interact with a part of a patient's body. The handpiece assembly for medical device (4) further comprises a handpiece antenna (12), arranged in the handpiece distal portion (22), and radiofrequency signal supply means, configured to provide a radiofrequency signal to the handpiece antenna (12) adapted to be transmitted by the handpiece antenna (12). The handpiece antenna (12) is configured to wirelessly communicate with the insert tip antenna (8) when said insert tip assembly is inserted into the handpiece (4) in an insertion region comprised in the handpiece distal portion (22). The handpiece antenna (12) is a loop antenna or segmented ring antenna comprising at least two handpiece antenna segments, electrically arranged in series, wherein a first end of a first segment is operatively connected to a first terminal of said radiofrequency signal supply means, and a second end of a last segment of said at least two handpiece antenna segments is operatively connected to a second terminal of said radiofrequency signal supply means, to form, around said insertion region, a coil radiating structure configured to generate an electromagnetic field in the insertion region with a radiofrequency dependent on said radiofrequency signal. Each of said at least two handpiece antenna segments comprises a radiant metal element, characterized by a respective inductance, electrically connected in series with a capacitive element, having a capacitance such as to compensate for effects due to the inductance of the radiant metal element on currents circulating in the coil of the handpiece antenna (12) and to adapt the characteristic impedance of the handpiece antenna (12) to the radiofrequency generator of the control element (21) of the medical device (20). A medical device (20) is further described comprising a control element (21), an insert tip assembly (1), and a medical device handpiece assembly as described above.