Development of a Novel “Optical Puncture Needle” Using Ultrathin High-Definition Image Guide System for Percutaneous Nephrolithotomy

Abstract

Abstract Introduction: The indications for percutaneous nephrolithotomy (PCNL) have been a paradigm shift in the past decade. The advent of miniaturization of instruments such as smaller endoscopes, smaller retrieval devices, and energy sources has extended the indication of PCNL.1–4 The most important step is to make optimal percutaneous access, which facilitates to perform PCNL safely and effectively. We originally developed an “optical puncture needle” using ultrathin high-definition image guide (HDIG) system and applied it to making percutaneous access for PCNL. Materials and Methods: A 20-gauge puncture needle equipped with a 0.65 mm micro-optic, having an integrated light lead, was developed as part of a collaborative research with Takei Medical & Optical Co. Ltd. (Tokyo, Japan) and Sumita Optical Glass, Inc. (Saitama, Japan). The HDIG system consists of a 0.35 mm precise object lens and optical glass fiber, wherein real-time HD images can be seen through the digital image processing device. After e...