A flexible fiber-optic photoacoustic focused ultrasound transducer

Abstract

The invention discloses a flexible optical fiber-type photoacoustic focusing ultrasonic transducer, which comprises a double-clad optical fiber (1), an ultraviolet adhesive protection layer (2), an ultraviolet adhesive micro concave lens (3) and an photoacoustic excitation coating (4). The transducer adopts a concave vibrator focused ultrasound mode; high-frequency laser with certain power is irradiated to the end face of the optical fiber through the double-clad optical fiber, and due to the fact that emergent laser diffuses at a certain angle on the end face of the double-clad optical fiber,the air cavity design in the ultraviolet adhesive protection layer can achieve the effect that the laser is evenly irradiated to the whole surface of the ultraviolet adhesive micro-concave lens. Thephotoacoustic excitation coating located on the upper surface of the ultraviolet adhesive micro-concave lens is irradiated by high-frequency laser to generate high-amplitude instantaneous thermal expansion, and then ultrasonic waves are excited. Due to the structural characteristics of the concave vibrator, the excited ultrasonic waves are focused at the focus of the ultraviolet glue micro concavelens, a size of the traditional focusing ultrasonic transducer is greatly reduced, and the focusing ultrasonic transducer has the advantages of being novel in structure, flexible, miniaturized, highin sensitivity, resistant to electromagnetic interference and the like.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a flexible optical fiber photoacoustic focused ultrasonic transducer. Background technique [0002] Ultrasound medical diagnosis and treatment technology, as an effective, safe and convenient medical method, has been widely used in clinical medicine. In the 1940s, American scientists Lynn and Fry proposed high-intensity focused ultrasound (HIFU) technology, which has received widespread attention since it was proposed. High-intensity focused ultrasound technology concentrates ultrasonic energy into a small volume, and uses its high-intensity energy to destroy tissue targets in the target area, which has important practical significance and wide application value for non-invasive surgery in vitro and the treatment and rehabilitation of special diseases . [0003] In traditional high-intensity focused ultrasound medical equipment, individual ultrasonic c...

AI Technical Summary

Problems solved by technology

However, the ultrasonic transducer with this structure cannot accurately control the structural size of the concave vibrator and the thickness of the light-absorbing vibration material, and its poor structural consistency also makes this focused ultrasonic transducer not yet applicable to ultrasonic medical diagnosis and treatment.

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