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Schematic and micrograph of optical-resolution PAI catheter: (a) Schematic of the whole structure of the catheter, (b) Side view, and (c) Top view of the catheter micrographs. PT1, polyimide tube 1 with an 0.7 mm inner diameter; PT2, polyimide tube 2 with an 0.74 mm inner diameter; SMF, single-mode fiber; FSC, flexible stainless steel coil; TC, transducer cable; GL, gradient-index lens; STH, stainless steel tube housing; M, micro-prism; UST, ultrasonic transducer; B, metal base [129].
