Related Experiment Video
Updated: Jul 3, 2026
06:37
An Immature Murine Model of Reversible Unilateral Ureteral Obstruction
Published on: April 4, 2025
Working tools in flexible ureterorenoscopy--influence on flow and deflection: what does matter?
T Bach1, B Geavlete, T R W Herrmann
1Asklepios Hospital Barmbek, Department of Urology, Hamburg, Germany. t.bach@asklepios.com
Journal of Endourology
|July 16, 2008
Summary
Tool selection significantly impacts flexible ureteroscope performance. Larger tools reduce irrigation flow and deflection, potentially compromising visualization during stone procedures.
Area of Science:
- Urology
- Medical Devices
- Endoscopy
Background:
- Flexible renoscopes provide access to the renal collecting system.
- Optimal visualization is crucial for stone workup, making irrigation flow critical.
Purpose of the Study:
- To evaluate the impact of tools and probes on deflection angle and irrigation flow volume in modern flexible renoscopes.
Main Methods:
- Tested five flexible renoscopes (Wolf, Storz, ACMI, Olympus).
- Measured deflection angle, bent tip diameter, and flow rates with empty and loaded scopes.
- Evaluated laser fibers, biopsy forceps, and nitinol baskets of various French sizes.
Main Results:
- Deflection angle is not affected by basket size but is reduced by laser fibers and biopsy forceps.
- Tool introduction increases bent tip diameter and significantly decreases irrigation flow volume, especially with larger tools.
- Irrigation volume loss ranged from 62% to 99% depending on tool size.
Conclusions:
- Intraoperative visualization is dependent on the working tool used due to effects on irrigation flow and deflection.
- Proper selection of flexible renoscopes, probes, and tools is essential for successful ureterorenoscopy.
Related Concept Videos
01:19Urodynamic Studies: Uroflowmetry
Uroflowmetry is a non-invasive urodynamic test designed to measure various aspects of urination, including volume, flow rate, and the time to void. This test is crucial for diagnosing and assessing conditions such as bladder outlet obstruction, bladder dysfunction, incomplete bladder emptying, incontinence, and urinary tract blockages caused by benign prostatic hyperplasia (BPH) and urethral strictures.Pre-Test Instructions:Before a uroflowmetry test, patients are typically advised to drink...
01:25Urinary Tract Calculi VI: Surgical Management
Procedures for Kidney StonesMedical intervention is necessary when kidney stones or renal calculi are too large to pass spontaneously (typically greater than 5 millimeters) when stones are accompanied by symptomatic infection (such as fever or pyelonephritis), when they impair kidney function, or when they cause persistent symptoms like severe pain, nausea, or urinary retention. Additionally, patients with only one kidney or those who cannot be treated with medical management also require...
01:22Imaging Studies V: Intravenous Urography and Retrograde Pyelography
IntroductionIntravenous Urography (IVU) and Retrograde Pyelography (RP) are important diagnostic imaging techniques used to evaluate the urinary system. These methods help identify structural abnormalities, obstructions, and functional issues in the kidneys, ureters, and bladder. Both procedures use iodine-based contrast media to enhance the visibility of urinary tract structures on X-ray images, though they differ in their methods and indications.1. Intravenous Urography (IVU)Intravenous...
01:28Urologic Endoscopic Procedure: Cystoscopic Examination
Meaning of Cystoscopic Examination:Cystoscopy is an essential diagnostic tool in urology that is used to assess the structure and function of the genitourinary system. It provides a direct view of the urethra, bladder, and, in some cases, the ureteral openings. This procedure helps detect structural abnormalities, infections, cancers, and blockages in the urinary tract. There are two types of cystoscopy:Flexible cystoscopy is commonly performed in outpatient settings due to its less invasive...
01:26General External Flow Characteristics
The study of external flow is essential for creating structures and objects that interact efficiently and safely with moving fluids, such as air or water. When a body is immersed in a flowing fluid, it experiences two primary forces: drag, which opposes motion along the flow direction, and lift, which acts perpendicular to the flow. The shape, size, and orientation of the object influence these forces.Streamlined and Blunt Bodies in External FlowObjects in fluid flow are classified as...
01:28Urinary Tract Calculi V: Nursing Management
AssessmentSubjective Data: Obtain a detailed health history, including any recent or chronic urinary tract infections, periods of immobilization, previous episodes of renal calculi, and medical conditions such as gout, benign prostatic hyperplasia, or hyperparathyroidism. Review the medication history for drugs that may influence stone formation, including allopurinol, analgesics, loop diuretics, or thiazide diuretics. Document the use of long-term indwelling catheters and any past surgical...