In-Vivo RFID Antenna Deployment Through Small Surgical Apertures
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Solution Overview
Problem
Current RF tag detection systems for surgical sites face challenges in accuracy and efficiency due to signal interference and the inability to use large antennas through small surgical apertures, which can lead to missed objects and increased surgical risks.
Innovation Solution
An in-vivo introducible antenna system that can be collapsed for insertion through small apertures and automatically expand within the surgical site, utilizing a semi-rigid elongated member with a flexible loop made of shape memory alloy to enhance detection range while minimizing external interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large antenna is used for direct interrogation within the surgical site, then the detection range and accuracy improve, but the antenna cannot be inserted through small surgical apertures
Solution Approach 1:
The antenna transitions from a compressed state during insertion to an expanded state during operation. The delivery catheter allows the antenna to be inserted in a low-profile configuration, then deployed to its full operational size within the surgical site, enabling both small aperture compatibility and large detection range
Solution Approach 2:
The antenna is nested within the delivery catheter during insertion, similar to a doll within a doll. The antenna occupies a collapsed configuration inside the catheter lumen, then emerges and expands to its full functional size after deployment, allowing the larger antenna to pass through the smaller catheter opening
2Productivity
If manual counting procedures are used to track surgical objects, then no specialized equipment is needed, but the process is time-consuming and prone to human error
Solution Approach 1:
The manual mechanical counting process is replaced with an automated electromagnetic detection system. The antenna automatically detects RFID tags on surgical objects using electromagnetic fields, eliminating the need for human personnel to manually count and track each item, thereby improving both speed and accuracy
Solution Approach 2:
The system performs automatic detection and tracking of surgical objects without requiring human intervention for counting. The antenna continuously scans for RFID tags and provides real-time feedback, allowing the system to self-monitor and report the presence or absence of surgical objects
3Measurement precision
If external interrogation systems are used, then large antennas can be used, but signal interference from external factors reduces detection accuracy
Solution Approach 1:
The antenna is extracted from the external environment and placed directly within the surgical site. By removing the antenna from outside the body and inserting it into the surgical field, the system eliminates external sources of electromagnetic interference while maintaining optimal detection capabilities
Solution Approach 2:
The antenna serves as an intermediary between the RFID tags on surgical objects and the detection system. By placing this intermediate detection element directly within the surgical site, the system achieves accurate detection while isolating the measurement process from external interference sources
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 system allows for accurate and efficient detection of RFID-tagged surgical implements within the body, reducing the risk of missed objects and minimizing the need for manual counts, thus improving surgical safety and efficiency.
Implementation Method 1
utilizing a semi-rigid elongated member with a flexible loop made of shape memory alloy to enhance detection range while minimizing external interference
Data Source
AI summary
An interrogation and detection system for detection of surgical implements within a patient's body, the system including One or more RFID tags affixed to a surgical implement within the patient's body. Each RFID tag being configured to transmit a return signal when energized, and a remote signal generator configured to generate an energizing signal for the one or more RFID tags. The signal generator operably coupled to the in-vivo introducible antenna via a communication cable. The system further includes an in-vivo introducible antenna configured to be inserted through a trocar-cannula assembly into a surgical site within the patient's body. Wherein the tubular channel defines a shape having a dimension “D1”, such that the dimension “D1” of the tubular channel is less than the dimension “D2” of the in-vivo introducible antenna.