Arrangement of side holes in a double J stent for high urine flow in a stented ureter

Kim, Kyung Wuk; Kim, Hyoung Ho; Choi, Young Ho; Lee, Seung Bae; Baba, Yasutaka; Suh, Sang Hyun

doi:10.1007/s12206-020-0144-1

Cited by 9 publications

(4 citation statements)

References 22 publications

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“…It is shown that side holes around the stenosis increase the total flow rate, in agreement with Tong et al (2006), and that this enhancement increases with higher degree of stenosis blockage. Effects of the overall ureter shape, that is, tubular, funnel‐shaped, and undulated are also studied by Kim et al (2017b) and Kim, Choi, Lee, Baba, and Suh (2020), and the authors concluded that the ureter shape closest to the human ureter (such as that from a CT scan) should be always considered first to obtain more accurate results.…”

Section: Methodsmentioning

confidence: 97%

“…Simulations of urine flow in stented ureters with different configurations in terms of ureter geometry, stent architecture, and local stenosis have been carried out extensively over the past few years (Kim et al, 2015a, 2015b; Kim et al, 2017a, 2017b; Kim, Kim, Choi, Lee, Baba, & Suh, 2020). Notably, the geometry of the curved ureter (Figure 3(d)) adopted by Kim et al (2015b) is reconstructed from real human ureters, using computed tomography (CT) images of the UUT from 19 healthy males.…”

Section: Methodsmentioning

confidence: 99%

“…In consecutive studies more configurations of the stent/ureter model are studied to understand the effect of side holes and the ureter diameter (Kim et al, 2015a; Kim et al, 2017a, 2017b; Kim, Kim, Choi, Lee, Baba, & Suh, 2020). In the work of Kim et al (2017a), 20 cases are studied with different levels of ureteral stenosis (33, 52, 74, and 88% blockage based on cross sectional area) and with several side hole configurations.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Fluid mechanical modeling of the upper urinary tract

Zheng

Carugo

Mosayyebi

et al. 2021

WIREs Mechanisms of Disease

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The upper urinary tract (UUT) consists of kidneys and ureters, and is an integral part of the human urogenital system. Yet malfunctioning and complications of the UUT can happen at all stages of life, attributed to reasons such as congenital anomalies, urinary tract infections, urolithiasis and urothelial cancers, all of which require urological interventions and significantly compromise patients' quality of life. Therefore, many models have been developed to address the relevant scientific and clinical challenges of the UUT. Of all approaches, fluid mechanical modeling serves a pivotal role and various methods have been employed to develop physiologically meaningful models. In this article, we provide an overview on the historical evolution of fluid mechanical models of UUT that utilize theoretical, computational, and experimental approaches. Descriptions of the physiological functionality of each component are also given and the mechanical characterizations associated with the UUT are provided. As such, it is our aim to offer a brief summary of the current knowledge of the subject, and provide a comprehensive introduction for engineers, scientists, and clinicians who are interested in the field of fluid mechanical modeling of UUT. This article is categorized under: Cancer > Biomedical Engineering Infectious Diseases > Biomedical Engineering Reproductive System Diseases > Biomedical Engineering

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Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Fluid mechanical modeling of the upper urinary tract

Zheng

Carugo

Mosayyebi

et al. 2021

WIREs Mechanisms of Disease

View full text Add to dashboard Cite

show abstract

“…In parallel to stent coatings and materials, fluid dynamicsdriven design is an active research area that is being pursued with the aim of reducing encrustation and biofilm formation in stents. Some studies focused on fluid mechanical changes due to different stent sizes (2,(21)(22)(23), and the diameter (2,14) and spatial distribution (24,25) of side holes using mathematical modeling (26)(27)(28), computational fluid dynamics (CFD) (21)(22)(23)(24)(25)(29)(30)(31), and in vitro flow systems (2,14,22). However, only a limited number of studies have analyzed the interplay between flow metrics (such as WSS), crystal deposition (14, 32, 33) and bacterial attachment (34) within a stented ureter.…”

Section: Introductionmentioning

confidence: 99%

The interplay between bacterial biofilms, encrustation, and wall shear stress in ureteral stents: a review across scales

Amado,

Zheng,

Lange

et al. 2024

Front. Urol.

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Ureteral stents are hollow tubes that are inserted into the ureter to maintain the flow of urine from the kidney to the bladder. However, the use of these indwelling stents is associated with potential complications. Biofilm, an organized consortium of bacterial species embedded within a self-producing extracellular matrix, can attach to the outer and inner surfaces of ureteral stents. Furthermore, encrustation - defined as the buildup of mineral deposits on the stent surface - can occur independently or in parallel with biofilm formation. Both phenomena can cause stent obstruction, which can lead to obstructive pyelonephritis and make stent removal difficult. Understanding the influence of flow on the development of biofilm and encrustation and the impact of small mechanical environmental changes (e.g., wall shear stress distribution) is key to improve the long-term performance of stents. Identifying the optimal stent properties to prevent early bacterial attachment and/or crystal deposition and their growth, would represent a breakthrough in reducing biofilm-/encrustation-associated complications. This review identifies the most prevalent bacterial strains and crystal types associated with ureteral stents, and the process of their association with the stent surface, which often depends on patient comorbidities, stent material, and indwelling time. Furthermore, we focus on the often-overlooked role of fluid dynamics on biofilm and encrustation development in ureteral stents, across a range of physical scales (i.e., from micro- to macro-scale) with the aim of providing a knowledge base to inform the development of safer and more effective ureteral stents.

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The Influence of Polyurethane Double-J Stent of Various Diameters on Urological Encrustation

Pasik

2021

Biomechanics in Medicine, Sport and Biology

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Arrangement of side holes in a double J stent for high urine flow in a stented ureter

Cited by 9 publications

References 22 publications

Fluid mechanical modeling of the upper urinary tract

Fluid mechanical modeling of the upper urinary tract

The interplay between bacterial biofilms, encrustation, and wall shear stress in ureteral stents: a review across scales

The Influence of Polyurethane Double-J Stent of Various Diameters on Urological Encrustation

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