Nerve block plane accurate determination method based on multi-modal physiological signal fusion

By using multimodal physiological signal fusion technology, combining piezoelectric diaphragms and ring transducer arrays with ultrasonic micro-vibration waves and short-pulse lasers, objective, quantitative, and high-resolution determination of the nerve block plane was achieved. This solved the problems of subjective error and poor repeatability in existing methods and provided real-time visualized assessment of the block plane.

CN122440135APending Publication Date: 2026-07-24MIYI COUNTY PEOPLES HOSPITAL
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Patent Information

Application Number
CN202610818614.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-08
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing methods for determining the level of nerve block rely on the patient's subjective response or indirect changes in the skin after sympathetic nerve block, which have significant problems with subjective error and poor repeatability.

Method used

A multimodal physiological signal fusion method was adopted. By attaching a piezoelectric diaphragm and placing a ring transducer array in the test area, modulated ultrasonic micro-vibration waves and dual-wavelength short-pulse lasers were simultaneously emitted to excite the tissue in a combined acoustic and optical manner. Photoacoustic signals and ultrasonic reflection signals were collected. The three-dimensional elastic modulus distribution was calculated using a phase-locked photoacoustic tomography reconstruction algorithm, the boundary of the nerve block plane was extracted, and the visualization results were output.

Benefits of technology

It enables objective determination of the nerve block plane without the need for patient cooperation, eliminating the subjective errors and poor repeatability of traditional methods, significantly improving the quantitative assessment accuracy of the block effect, and achieving real-time, high spatial resolution visualization of the nerve block plane.

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Abstract

The invention relates to the technical field of photoacoustic imaging, and discloses a nerve block plane accurate measurement method based on multi-modal physiological signal fusion, which comprises the following steps: attaching a plurality of piezoelectric diaphragms to a to-be-measured area; an annular transducer array is placed in the to-be-detected area; synchronously transmitting modulated ultrasonic micro-vibration waves and double-wavelength long-short pulse laser to perform acousto-optic combined excitation on tissues; acquiring an original photoacoustic signal and an ultrasonic reflection signal through the annular transducer array; preprocessing the collected signal to obtain an instantaneous phase; calculating local phase offset based on a phase locking photoacoustic tomography reconstruction algorithm and performing inversion to obtain three-dimensional elastic modulus distribution; and extracting a nerve block plane boundary according to the three-dimensional elastic modulus distribution and outputting a visualization result. The phase shift of the modulated ultrasonic micro-vibration wave is directly inverted into tissue three-dimensional elastic modulus distribution, and in combination with a phase locking photoacoustic tomography reconstruction algorithm, objective nerve block plane determination without subjective cooperation of a patient is realized.
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