We propose a novel concept for a high-speed optical data link in 360 µm diameter cardiovascular interventional imaging guidewires. The concept is based on the recently introduced Flex-to-Rigid (F2R) technology platform. This technology allows for new intravascular imaging devices with the required small form-factor. We extended the existing F2R technology with a new optical data link assembly method to enable high speed data communication from the distal tip of the catheter to the proximal side. In this method, the fiber is aligned by inserting it into a through-wafer hole directly underneath the flip-chipped Vertical-Cavity-Surface Emitting Laser (VCSEL). Therefore, the total diameter of the optical data link is primarily limited by the size of the VCSEL. A wafer-scale demonstrator setup was fabricated with a commercially available 350x250 µm VCSEL and an 80 µm diameter multimode optical fiber. Test results of our demonstrator showed a correct optic coupling of the VCSEL into the fiber.

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Smart minimally invasive devices face a connectivity challenge. An example is found in intracardiac echocardiography where the signal transmission and supply of power at the distal end require many thin and fragile wires in order to keep the catheter slim and flexible. We have built a fully functional bench-top prototype to demonstrate that electrical wires may be replaced by optical fibers. The prototype is immediately scalable to catheter dimensions. The absence of conductors will provide intrinsic galvanic isolation as well as radio frequency (RF) and magnetic resonance imaging (MRI) compatibility. Using optical fibers, we show signal transfer of synthetic aperture ultrasound images as well as photo-voltaic conversion to supply all electronics. The simple design utilizes only off the shelf components and holds a promise of cost effectiveness which may be pivotal for translation of these advanced devices into the clinic.

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