Systems and methods for monitoring physiological parameters during diathermy
Inventors
Kayton, Avi • AMOSSI, Aviem • ARAZI, SHAULI
Assignees
Publication Number
US-12076155-B2
Publication Date
2024-09-03
Expiration Date
2039-07-21
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Abstract
Disclosed is a system for monitoring physiological parameters during a medical interventional procedure involving high intensity/energy radiofrequency electrical currents/voltages applied through a body of a subject, the system including an electrode-based sensor, configured to close an electrical conduction path passing through a body of a subject, and one or more non-electrode-based sensors, a plurality of electrical lines, a monitor, and a filter array including EMI filters mounted at specific locations and characterized by a frequency response curve having a magnitude of an attenuation in a first frequency range (typical of operating frequencies of high intensity/energy radiofrequency medical interventional equipment), which is greater than a magnitude of an attenuation in a second frequency range (typical of the sampling frequencies of the electrode-based sensor and the one or more non-electrode-based sensors), the system being thereby configured for suppressing noise induced by the medical interventional equipment.
Core Innovation
The invention provides a system and method for monitoring physiological parameters during medical interventional procedures involving the application of high intensity or high energy radiofrequency electrical currents or voltages, such as diathermy and RF ablation. The system comprises a sensor assembly including an electrode-based sensor that closes an electrical conduction path through a subject’s body and one or more non-electrode-based sensors that monitor physiological parameters. The system includes a plurality of electrical lines connecting the sensors to a monitor and a filter array with electromagnetic interference (EMI) filters placed at specific locations characterized by differential attenuation in frequency ranges associated with the medical equipment’s operating frequencies versus sensor sampling frequencies.
The problem being solved is the detrimental noise interference induced by diathermy or electrocautery equipment on physiological sensors, particularly electrode-based sensors like ECG or galvanic skin response sensors. This noise, caused by high energies and capacitive or inductive coupling, distorts or saturates sensor signals, compromising reliable monitoring of parameters such as pain and nociception during the procedure. Inadequate monitoring may lead to improper anesthesia dosing with serious patient risks. The invention addresses the need for reliable physiological monitoring during procedures involving high-frequency electrical currents by suppressing equipment-induced noise through the strategic placement and characteristics of EMI filters.
Claims Coverage
The patent includes one identified independent claim describing a system for monitoring physiological parameters during medical interventional procedures involving high intensity or high energy radiofrequency electrical currents or voltages. The main inventive features focus on noise suppression and sensor arrangement.
System comprising electrode-based and non-electrode-based sensors with EMI filters for noise suppression
The system includes a sensor assembly with an electrode-based sensor configured to close an electrical conduction path through a subject’s body and at least one non-electrode-based sensor to monitor physiological parameters during a medical interventional procedure applying high intensity/energy radiofrequency currents or voltages. It features a first electromagnetic interference (EMI) filter coupled to the electrode-based sensor configured to suppress noise in the non-electrode-based sensor signals induced via the electrode-based sensor by the medical equipment.
Electrical line configuration with EMI filters and frequency-dependent attenuation
A plurality of electrical lines electrically associates the sensor assembly with a monitor and includes a first line transmitting signals from the electrode-based sensor and a second line transmitting signals from the non-electrode-based sensor. Two EMI filters are mounted on the first line with one proximal to the sensor and the other distal near the monitor, and a third EMI filter is mounted on the second line. Noise suppression is achieved by ensuring the EMI filters attenuate frequencies in the first frequency range (equipment operating frequencies) by at least 10 dB more than in the second frequency range (sensor sampling frequencies).
Processor configured for physiological status assessment based on non-electrode sensor signals
The monitoring system includes a processor that assesses the physiological status of the subject based at least on signals from the non-electrode-based sensor, effectively discounting or cleaning signals influenced by noise from the electrode-based sensor during the interventional procedure.
The independent claim covers a system integrating electrode-based and non-electrode-based sensors electrically connected via filtered lines with EMI filters that are frequency-selective to suppress radiofrequency interference caused by high-intensity medical equipment, enabling reliable physiological monitoring by the processor during interventional procedures.
Stated Advantages
Reliable monitoring of pain, nociception, anesthesia, stress, anxiety, sleep, and analgesia during diathermy surgical procedures through suppression of diathermy-induced noise using EMI filters.
Enables suppression of noise in physiological sensors induced by high intensity and high energy radiofrequency medical interventional equipment, improving the accuracy and reliability of physiological data.
Reduces risks associated with improper anesthesia dosing by providing real-time, reliable physiological parameter monitoring during medical interventions involving high-frequency electrical currents.
Documented Applications
Monitoring physiological parameters such as autonomic nervous system activity, level of pain, nociception, anesthesia, analgesia, anxiety, stress, and sleep during diathermy surgical procedures.
Monitoring physiological parameters during radiofrequency (RF) ablation procedures or other medical interventional procedures applying high intensity or high energy radiofrequency electrical currents or voltages through a subject’s body.
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