Intravascular photo-acoustic imaging probe based on conical fibers and capable of simultaneously achieving optical coupling and photo-acoustic exciting

Abstract

The invention belongs to the field of vascular endoscope imaging, and discloses an intravascular photo-acoustic imaging probe based on conical fibers and capable of simultaneously achieving optical coupling and photo-acoustic exciting. The intravascular photo-acoustic imaging probe comprises a catheter, an ultrasonic transducer coaxial line, the conical fibers, torsion coils, a probe housing, a capillary glass tube, a grin lens, a coated reflector and an ultrasonic transducer, wherein the tail ends of the conical fibers are connected to the grin lens; the front end of the grin lens is connected to the coated reflector and the tail end of the grin lens is connected to the capillary glass tube; one end of the ultrasonic transducer is fixed to the endoscope probe housing, and the coaxial lineis connected to a photoelectric slip ring of a three-dimensional spiral scanning device; and the input ends of the conical fibers, together with the grin lens and the coated reflector, are fixed to the interior of the endoscope probe housing, and the output end is connected to the photoelectric slip ring of the three-dimensional spiral scanning device. According to the intravascular photo-acoustic imaging probe provided by the invention, efficient laser coupling can be achieved through large input core diameters and small output core diameters of the conical fibers and efficient exciting canbe achieved through cooperation with the focusing lens, so that a good advantage is achieved on intravascular photo-acoustic imaging.

Description

technical field [0001] The invention belongs to the research field of vascular endoscopy, and in particular relates to an intravascular photoacoustic imaging probe which realizes optical coupling and photoacoustic excitation simultaneously based on a tapered optical fiber. Background technique [0002] In the 21st century, cardiovascular and cerebrovascular diseases have become the number one killer affecting human health, and the rupture of atherosclerotic plaques is the main cause of acute heart disease vascular events. Although there are magnetic resonance angiography, angiography imaging, intravascular Ultrasound imaging, these imaging methods can better present the external shape or internal contour of the blood vessel, but cannot provide local details of the blood vessel wall. Intravascular photoacoustic imaging is a non-invasive and non-ionizing new biomedical imaging method developed in recent years. It has the advantages of both pure photoacoustic imaging and pure u...

AI Technical Summary

Problems solved by technology

[0004] Based on the above reasons, the main factors affecting intravascular photoacoustic / ultrasonic imaging are the low utilization rate of the laser by the endoscopic probe and the low output optical rate density; the low utilization rate of the laser by the endoscopic probe accelerates the damage of the device; The output optical power density is low, resulting in low signal-to-noise ratio and affecting image quality

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