Endoscopic opto-acoustic temperature measuring device and method based on wireless passive surface acoustic wave sensor

Abstract

The invention discloses an endoscopic opto-acoustic temperature measuring device and method based on a wireless passive surface acoustic wave sensor, the device comprises an integrated probe shell, an SAW (surface acoustic wave) temperature sensor, an opto-acoustic temperature measuring module, a transceiving antenna, a reader and an upper computer, the SAW temperature sensor and the opto-acoustic temperature measuring module are arranged in the integrated probe shell, the SAW temperature sensor comprises reflecting gratings, a piezoelectric substrate and an interdigital transducer (IDT), and in the structure of the SAW temperature sensor, the reflecting gratings are distributed on the two sides of the IDT to form an acoustic resonant cavity. According to the invention, through combination of SAW temperature measurement and opto-acoustic temperature measurement, lossless calibration of opto-acoustic temperature measurement under a living body is realized through the SAW temperature sensor, and quantitative temperatures of tissues with different depths are accurately obtained through opto-acoustic temperature measurement; on the basis of integrating SAW temperature measurement and opto-acoustic temperature measurement, the probe is miniaturized, and real-time detection of in-vivo temperature is facilitated due to wireless and passive properties.

Description

technical field [0001] The invention belongs to the technical field of medical photoacoustic temperature measurement, and in particular relates to an endoscopic photoacoustic temperature measurement device and method based on a wireless passive surface acoustic wave sensor. Background technique [0002] Photoacoustic thermometry technology is a new type of temperature detection method developed in recent years. Under the irradiation of short-pulse laser, the tissue absorbs energy and undergoes thermal expansion, and the resulting initial sound pressure and tissue temperature have a good relationship within a certain range. Therefore, the photoacoustic effect can be used to measure tissue temperature. The principle of photoacoustic measurement enables photoacoustic technology to combine the high penetration of ultrasonic measurement with the advantages of high contrast and high resolution of optical measurement. The ability to measure temperature. [0003] Among them, photo...

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Problems solved by technology

[0004] Invention Patent No. 201410358020.6 discloses a switch cabinet surface acoustic wave temperature measurement system, which can realize wireless passive temperature measurement of switch cabinet plum blossom contacts, but its The overall package of the probe part is relatively large, and it cannot migrate to the temperature monitoring in the human body. At the same time, the SAW temperature measurement can only obtain the surface temperature

Utility Patent No. 200520054688.8 discloses an internal body temperature measuring device, which can non-invasively and accurately measure tissue surface temperature, but the transmitter of the system is not passive, and the system enters the human body in the form of oral administration, so the position of the capsule cannot be determined Therefore, it is impossible to monitor the fixed-point temperature in real time

Invention Patent No. 201510239400.2 discloses a dual-wavelength photoacoustic temperature measurement method, which can solve the problem that single-wavelength laser measurement is easily affected by the system, environment, target state, and measurement angle. The photoacoustic-temperature correspondence table measured in the case of in vivo tissue is used to obtain the initial measurement temperature corresponding to the intensity of the photoacoustic signal. However, due to the difference between isolated tissue and living tissue, it is difficult to determine the photoacoustic- The universality of the temperature correspondence table in the living body makes it impossible to confirm the accuracy of the temperature measurement

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