Focusing vortex acoustic tweezers control system and method with obstacle avoidance control function

Abstract

The invention provides a focusing vortex acoustic tweezers control system and a method with an obstacle avoidance control function. The active phase control and passive structure phase modulation of aplanar fan-shaped transducer array are utilized to construct the focusing vortex acoustic tweezers with a controllable obstacle avoidance cavity, and object control behind an obstacle is realized. The curvature radius of a self-bending wave beam arc track is regulated and controlled through the order and the wave number of a semi-Bessel sound beam, the hollow radius of a phase modulation disc isdetermined according to the size of an obstacle, and regulation and control over the shape and the size of an arc track obstacle avoidance cavity and the axial distance of the acoustic tweezers are achieved. The capture radius and the capture capability of the focusing vortex acoustic tweezers are further regulated and controlled through the vortex topological charge of the transducer. According to the invention, sound waves emitted by the transducer array can be guided to bypass bones and important organs to form the focusing vortex acoustic tweezers, rotary capture of drug particles is realized, the thermal therapy effect of a focal region can be enhanced by utilizing drug accumulation, and a new method is provided for application of the focusing vortex acoustic tweezers in biomedicine.

Description

technical field [0001] The invention relates to the fields of focused ultrasound therapy and small object manipulation (cells, medicines, stones, contrast agents) in biomedical applications, and in particular to a focused vortex acoustic tweezers manipulation system and method with obstacle avoidance manipulation functions. Background technique [0002] Acoustic tweezers manipulation has the advantages of non-invasiveness, no radiation, and good biocompatibility, and has received extensive attention in biomedical particle manipulation applications. The vortex sound field has a unique sound field distribution, and the vortex sound tweezers can be constructed to realize the rotating capture and central concentration of particles, which greatly improves the effects of ultrasound imaging, targeted drug delivery, and ultrasound therapy. Commonly used vortex sound field formation methods include active phase control technology and passive structure control technology. Active phase...

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Problems solved by technology

[0004] The present invention aims at problems such as weak control ability, low positioning accuracy, great influence by obstacles, and difficulty in practical application existing in the existing acoustic tweezers control technology, and proposes a focusing vortex acoustic tweezers control system and method with obstacle avoidance control function, which solves the problem When the traditional vortex acoustic tweezers encounter rigid or strong scattering obstacles (such as bones), the sound pressure of the vortex acoustic field drops, the capture ability decreases, and even the serious problem that the vortex acoustic tweezers cannot be constructed

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