Um g20 29r

Manufactured by Olympus

Sourced in Japan

The UM-G20–29R is a lab equipment product from Olympus. It is a microscope objective lens designed for use in various laboratory applications. The core function of this product is to provide high-quality optical performance for magnifying and analyzing samples under a microscope.

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Lab products found in correlation

Jagwire, by Boston Scientific (2 mentions) Omnipaque, by GE Healthcare (2 mentions) Jf 240, by Olympus (1 mentions) Visiglide, by Olympus (1 mentions) Jf 260v, by Olympus (1 mentions) Tjf 240, by Olympus (1 mentions) Tjf 160f, by Olympus (1 mentions) Microknife xl, by Boston Scientific (1 mentions) Tjf 260v, by Olympus (1 mentions) Fb 39q, by Olympus (1 mentions)

6 protocols using um g20 29r

Biliary Evaluation through Endoscopic Ultrasound

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Endoscopic retrograde cholangiography was performed using a side-viewing scope (JF230, JF240, TJF240, JF260V; Olympus Medical Systems Co., Ltd., Tokyo, Japan) with patients under mild conscious sedation via administration of 5-10 mg of diazepam. For contrast medium, sodium and meglumine diatrizoate (Urografin; Nippon Schering KK, Japan) was used.
Intraductal ultrasound examination was performed to evaluate biliary abnormalities that were revealed by ERC imaging. After injection of contrast medium into the bile duct through the ampulla, a 0.035- or 0.025-inch guidewire (Jag-wire, Boston Scientific Japan Co., Tokyo; and/or Tracer Metro, Cook Japan Co., Tokyo; and/or Visiglide, Olympus Medical Systems Co., Ltd., Tokyo, Japan) was inserted into the bile duct. A 20 MHz mini-probe (UM-G20–29R; Olympus Medical Systems Co., Ltd., Tokyo, Japan) was passed through the biopsy channel of the scope and was inserted transampullarily into the bile duct following a guidewire. IDUS images were monitored on the ultrasound system (EU-M20/MH-241; Olympus Medical Systems Co., Ltd., Tokyo, Japan). The IUDS probe was moved from the hiatus to the ampulla, and each sectional view of the bile duct was recorded. These recorded images were assessed with complete agreement by six experienced endosonographers who each had more than 5 years’ experience.

Takagi T., Irisawa A., Shibukawa G., Hikichi T., Obara K, & Ohira H. (2015). Intraductal ultrasonographic anatomy of biliary varices in patients with portal hypertension. Endoscopic Ultrasound, 4(1), 44-51.

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Bile Duct Evaluation using Intraductal Ultrasound

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All procedures were performed using a standard side-viewing duodenoscope (JF-260F or TJF-160F; Olympus, Tokyo, Japan) in an endoscopy room without radiocontrast cholangiogram. After cannulation with a 0.035-inch-diameter guidewire (Jag-wire; Boston Scientific, Natick, MA, USA), the “bile aspiration” technique or checking of the guidewire direction on fluoroscopy were used to indicate bile duct cannulation.3 (link) Some patients in who there was difficultly accessing the bile duct underwent infundibulotomy or a precutting method on the ampulla using a needle knife (Microknife XL; Boston Scientific). A 2.0-mm-diameter IDUS probe with a frequency of 20-MHz (UM-G20-29R; Olympus) was advanced over a guidewire into the bile duct. IDUS scanning was performed while inserting the IDUS probe from the papilla of Vater (POV) to the confluent portion of the common bile duct (CBD) over the guidewire. Stones, biliary stricture, and in-growing or out-growing masses were revealed by IDUS (Fig. 1).

Lim S.U., Park C.H., Kee W.J., Lee J.H., Rew S.J., Park S.Y., Kim H.S., Choi S.K, & Rew J.S. (2015). Intraductal Ultrasonography without Radiocontrast Cholangiogram in Patients with Extrahepatic Biliary Disease. Gut and Liver, 9(4), 540-546.

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High-Frequency Ultrasound Imaging of Gastric Varices

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HFIUS was performed simultaneously with EGD. The HFIUS catheter assembly consisted of a 2.3-mm diameter ultrasonic miniprobe equipped with a 20-MHz transducer (UM–G20–29R, Olympus). The catheter was inserted via one of the accessory channels, and an automatic water infusion pump was attached to another channel to facilitate infusion of deaerated water. The HFIUS miniprobe, which has an axial resolution of approximately 0.1 mm and a penetration depth of 2.0 cm, was advanced to the mid-body of the stomach and was gradually withdrawn along the lesser curvature until the distal third of the esophagus was scanned. EUS images were recorded electronically for subsequent review by two examiners (JHK and WHC). The largest CSA sizes of varices using HFIUS were estimated using ImageJ software (NIH, Bethesda, MD, United States). The CSA of each varix was measured between the hypoechoic blood-filled lumen and the hyperechoic submucosa or mucosa (Figures 1 and 2).

Kim J.H., Choe W.H., Lee S.Y., Kwon S.Y., Sung I.K, & Park H.S. (2021). Comparative study for predictability of type 1 gastric variceal rebleeding after endoscopic variceal ligation: High-frequency intraluminal ultrasound study. World Journal of Clinical Cases, 9(34), 10566-10575.

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Endoscopic Biliary Stricture Evaluation

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All procedures were performed using standardized protocols by two experienced investigators using a standard duodenoscope (JF or TJF‐260V; Olympus Medical System Co., Ltd., Tokyo, Japan) with the patients under conscious sedation. Standard techniques were used to cannulate the biliary tract, and contrast (Omnipaque; GE Healthcare, Seoul, Korea) was injected to identify the location and length of the stricture. For all patients, IDUS was performed followed immediately by cholangiogram. The IDUS probe (UM‐G20‐29R; Olympus Medical System) was 2.0 mm diameter and had a radial scanning catheter with a scanning frequency of 20 MHz. The catheter had a monorail‐type design at the tip, which facilitates its passage over guide wires. The IDUS probe was inserted into the bile duct under endoscopic and fluoroscopic guidance over a guide wire without endoscopic sphincterotomy (EST). IDUS imaging was performed during probe withdrawal and stricture dilation was not performed for the IDUS examination. The TPB of the biliary stricture was obtained under fluoroscopically guided retrograde biliary biopsy during ERCP after EST. TPB yielded four to six specimens using forceps with a 1.8‐mm‐diameter cup (FB‐39Q; Olympus Medical System). The remainder of the ERCP procedure was then performed according to the individual needs of each patient.

Lee Y.N., Moon J.H., Choi H.J., Kim H.K., Choi S., Choi M.H., Lee T.H., Lee T.H., Cha S, & Park S. (2017). Diagnostic approach using ERCP‐guided transpapillary forceps biopsy or EUS‐guided fine‐needle aspiration biopsy according to the nature of stricture segment for patients with suspected malignant biliary stricture. Cancer Medicine, 6(3), 582-590.

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ERCP and IDUS for Choledocholithiasis Diagnosis

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All patients were under conscious sedation during the procedure. Two experienced endoscopists performed ERCP using a conventional duodenoscope. The bile duct was evaluated using 50% diluted contrast media (Omnipaque; GE Healthcare, Seoul, Korea) to identify floating stones. An endoscopist and a radiologist confirmed the absence of filling defect on fluoroscopy by examining the digital image. If there was no filling defect on ERCP, IDUS was performed to identify CBD stones. We examined the bile duct from the first branch of the intrahepatic duct to the papilla via wire-guided IDUS using a 2.0-mm diameter catheter US probe with a frequency of 20 MHz (UM-G20–29R; Olympus Medical System, Co., Ltd., Tokyo, Japan). Two investigators evaluated the IDUS findings simultaneously. The positive finding of stones on IDUS was defined as any sized echogenic materials with posterior acoustic shadowing.

Goong H.J., Moon J.H., Lee Y.N., Choi H.J., Choi S.Y., Choi M.H., Kim M.J., Lee T.H., Park S.H, & Lee H.K. (2017). The Role of Endoscopic Biliary Drainage without Sphincterotomy in Gallstone Patients with Cholangitis and Suspected Common Bile Duct Stones Not Detected by Cholangiogram or Intraductal Ultrasonography. Gut and Liver, 11(3), 434-439.

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Irrigation and Ultrasound Evaluation of CBD

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In a small series, IDUS was carried out before and after the irrigation of CBD with a probe (UM-G20-29R, OLYMPUS, Tokyo, Japan; diameter 2.0 mm, frequency 20 MHz) via the transpapillary route. Residuum (stone or sludge) was defined as a hyperechoic material, distinguishable from air bubbles as hyperechoic defects with strong reverberation (Ohashi et al. 1999; Tsuchiya et al. 2008; Ang et al. 2009 ). The image was traced, and the number of spots in the CBD was counted (Fig. 2). The clearance rate of stone fragments was calculated using IDUS imaging before and after the irrigation of CBD.

Endo R., Satoh A., Tanaka Y., Shimoda F., Suzuki K., Takahashi K., Okata H., Hiramoto K., Kimura O., Asonuma S., Umemura K, & Shimosegawa T. (2020). Saline Solution Irrigation of the Bile Duct after Stone Removal Reduces the Recurrence of Common Bile Duct Stones. The Tohoku journal of experimental medicine, 250(3).

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