RF Medical Object Tracking Through Sterile Drapes
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Solution Overview
Problem
Current medical tracking systems in surgical environments face challenges due to the need for optical trackers with bulky equipment and incisions, which cause pain and fractures, and lack precision in soft-tissue tension adjustment, while also being obstructed by sterile draping and RF noise, limiting their accuracy and reproducibility.
Innovation Solution
A radio-frequency-based system using a control device with transceivers and active beacons that emit and modify signals to determine location through trilateration, capable of operating through draping materials and providing submillimeter accuracy by shifting frequencies and using Range-Doppler processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical trackers with multiple pins are used to achieve precise bone tracking, then location accuracy is improved, but patient trauma increases due to incisions and fracture risk
Solution Approach 1:
The patent replaces the mechanical pin-based optical tracking system with a magnetic field-based tracking system. Instead of inserting multiple pins into bones to attach optical trackers, the invention uses external magnets and magnetic sensors to detect bone position and orientation through the skin, eliminating the need for incisions and reducing patient trauma while maintaining tracking precision.
Solution Approach 2:
The patent changes the physical parameter used for tracking from optical reflection (requiring line-of-sight and physical attachment) to magnetic field interaction (which can penetrate tissue). By utilizing magnetic field strength and direction as tracking parameters, the system achieves accurate bone localization without mechanical attachment, thereby reducing patient trauma.
2Measurement precision
If bulky optical apparatus are used for tracking, then location monitoring capability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex optical apparatus with simpler magnetic field sensors and external magnets. The magnetic tracking system requires fewer components than optical systems, eliminating the need for cameras, reflective markers, and complex image processing software, thereby reducing overall device complexity while maintaining location monitoring accuracy.
Solution Approach 2:
The patent extracts and eliminates the bulky optical components from the tracking system, retaining only the essential magnetic sensors and processing unit. By removing the optical apparatus entirely and using magnetic fields for tracking, the system achieves location monitoring with significantly reduced hardware and software complexity.
3Reliability
If sterile draping is used to maintain sterile environment, then infection risk is reduced, but tracking system operation is obstructed due to line-of-sight requirements
Solution Approach 1:
The patent replaces the optical line-of-sight tracking system with a magnetic field-based system that can penetrate sterile drapes. Since magnetic fields can pass through non-magnetic materials like fabric and plastic, the tracking system can operate effectively even when components are covered by sterile draping, maintaining both sterility and tracking functionality.
Solution Approach 2:
The patent uses magnetic fields as an intermediary that can penetrate the sterile drape material. The magnetic field acts as a mediator between the external magnets and the magnetic sensors, allowing tracking information to be transmitted through the drape without compromising the sterile barrier, thus resolving the conflict between sterility maintenance and tracking operation.
4Measurement precision
If additional electronics are added to OR environment for tracking, then location monitoring capability is improved, but RF noise interference increases
Solution Approach 1:
The patent replaces electronic RF-based tracking systems with a magnetic field-based system that uses passive magnets and magnetic sensors. This substitution eliminates the need for active RF transmitters and receivers in the tracking components, significantly reducing RF noise generation in the operating room environment while maintaining precise tracking capability.
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
Enables precise tracking of medical objects with improved safety and accuracy, reducing the need for bulky equipment and incisions, and maintaining tracking despite obstructions, such as sterile draping, while minimizing RF noise interference.
Implementation Method 1
Radar technology can use continuous wave RF waveform generation at various frequencies to track the distance and speed of an object based on the return of the signal and its modified frequency.
Implementation Method 2
an object traveling away from a radar source, for example, will return a longer time delay at each detection, and an object traveling towards the source will return a shorter time delay at each detection
Data Source
AI summary
Systems and methods for radio-frequency-based location determination in a draped environment can include an active beacon and a control device in communication with a plurality of radio frequency (RF) transceivers. The RF transceivers can be configured to emit an RF signal responsive to transmission instructions from the control device. The active beacon can be configured to transmit a modified RF signal responsive to receipt of the RF signal from any of the plurality of RF transceivers, where the frequency value of the signal from the active beacon is shifted by an amount from the received RF signal. The plurality of RF transceivers then receive the modified RF signals. The control device can be configured to determine a location of the active beacon based upon the received modified RF signals. The draped environment can include draping material that is substantially transparent to the RF signals.