Optoacoustic/ultrasonic dual mode endoscope based on miniature piezoelectric ultrasonic transducer arrays

Abstract

The invention discloses an optoacoustic / ultrasonic dual mode endoscope based on piezoelectric micromachined ultrasonic transducer arrays. The optoacoustic / ultrasonic dual mode endoscope includes a piezoelectric micromachined ultrasonic transducer (PMUT) array probe (2), a PMUT array element (1), an integrated circuit (3), a plane lens (4), a condenser lens (6), an optical fiber coupling collimator (7), a single-mode fiber (8), an optical fiber FC / APC connector (9), an optical fiber (10), a signal line (11) and an housing (12). The optoacoustic / ultrasonic dual mode endoscope is characterized in that, the piezoelectric micromachined ultrasonic transducers are adopted, the transducers and the integrated circuit are good in compatibility during manufacturing process, and the transducers are easy to form an array; transducer arrays are adopted, the endoscope does not need to rotate, the imaging speed is raised, real time imaging is achieved; and the multiple transducer arrays can effectively raise the signal to noise ratio of a signal, deep imaging through focusing and scanning is achieved. The optoacousitc / ultrasonic dual mode endoscope can be widely applied to fields of medical endoscopes and industrial flaw detection, and particularly has great application value in in-vivo scar tissue identification, assessment of damage of ablation of tissue, atherosclerotic degree assessment and the like.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing of medical endoscopes, in particular to a photoacoustic / ultrasonic dual-mode endoscope based on a micro piezoelectric ultrasonic sensor array, which can be applied to cardiac scar tissue identification, ablation tissue damage assessment, atherosclerosis Hardening degree assessment, etc. Background technique [0002] Atherosclerosis is the main cause of death in cardiovascular diseases. It is characterized by the appearance of yellow substances such as cholesterol and fat in the intima of the arteries, which reduces the elasticity of the arteries and narrows the lumen, often leading to thrombosis and blood supply disorders. Seriously endanger life and health. Therefore, in the examination of atherosclerosis, it is particularly important to determine the location of lesions, the distribution and composition of vulnerable plaques. Commonly used detection methods include angiography,...

AI Technical Summary

Problems solved by technology

On the one hand, in order to solve the problems of complex CMUT process and high bias voltage, the present invention adopts the PMUT based on the piezoelectric effect as the ultrasonic sensing unit. This sensor not only has a high sensitive energy conversion effect and a large sensing impedance And the process is relatively simple

On the other hand, in order to solve the problems of existing photoacoustic endoscopes that need to be rotated, the imaging speed is slow, and real-time imaging cannot be performed, the present invention uses a PMUT array to receive photoacoustic and ultrasonic signals, which greatly shortens the imaging time

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