Intravascular Ultrasound Imaging Guidewire with Wireless Readout

描述（由申请人提供）：在美国，每年有超过100万例经皮冠状动脉介入手术，如球囊血管成形术和支架置入术，用于治疗缺血性心脏病。在几乎所有这些手术中，都使用一根细（0.014英寸）的导丝来引导导管插入。我们的目标是为这些导丝增加血管内超声（IVUS）成像能力，以便心脏病专家和介入放射科医生可以在介入之前、期间和之后使用这项有价值的技术作为常规的原位成像工具

DESCRIPTION (provided by applicant): Over a million percutaneous coronary interventions such as balloon angioplasty and stent deployment are performed in the US every year to treat ischemic heart diseases. A thin (0.014") guidewire is used to lead the catheter insertions in nearly all of these procedures. Our aim is to add intravascular ultrasound (IVUS) imaging capability to these guidewires so that cardiologists and interventional radiologists can use this valuable technique as a routine in-situ imaging tool before, during and after interventions without prolonging the procedure time and additional risk to the patient. This flexible IVUS probe will also enable imaging in narrowed and tortuous arteries which cannot be accessed by the existing IVUS probes. The proposed device exploits recent advances in guidewire sensor technology such as pressure (FFR) and flow wires in terms of physical implementation. It uses electrical connections provided on the guidewire for AC power supply for increased safety as well as low phase-noise timebase for wireless/broadband data links. It exploits CMUT-on-CMOS technology to its full extent for electronics integration and in a novel physical arrangement so that 4 separate 1- D phased array IVUS chips provide full cross sectional IVUS images with adequate resolution without any rotation. It integrates broadband (200Mb/s), ultra-compact, short-range, safe and low power (150mW) wireless or over-the-wire data links on the same chip to reduce the cable count down to two, retaining the mechanical performance of the guidewire. Specifically, for initial demonstrations, we plan for 40-45 MHz 1-D CMUT-on- CMOS arrays to match the lateral resolution of commercial 20MHz, 3.5F solid state IVUS arrays. We will investigate a wideband (~200Mb/s) wireless concept based on impulse-radio ultra wideband (IR-UWB) and pulse harmonic modulation (PHM) and two over-the-cable hardwired concepts including RF-back telemetry through power line and fully-differential capacitive readout methods. We will determine the leading candidate from these data link alternatives to implement the IC on a 300umx1000um silicon chip, matching the size of the CMUT IVUS array chips. Finally we will experimentally validate the IVUS on guidewire concept using two-chip (CMUT and Data link) configuration on a PCB through imaging experiments. The proposed project may result in a paradigm shift in interventional cardiology with new diagnostic and therapeutic capabilities for vascular and heart diseases. It will also pave the way for combining FFR and IVUS on a guidewire, essentially implementing 3-in-1 tool, which may improve procedure outcomes in a cost effective manner.