Polymers as Ureteral Stents

Venkatesan, Nandakumar; Shroff, Sunil; Jayachandran, Karthik; Doble, Mukesh

doi:10.1089/end.2009.0516

Cited by 102 publications

(107 citation statements)

References 58 publications

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“…In the case of renal stones, temporary placement of a ureteral stent is needed after lithotripsy. A double J stent among ureteral stents is widely used these days and many medical companies produce the stent [1][2][3]. A double J stent is composed of a shaft and proximal and distal coils, and it has multiple side holes along the axis of the stent.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of the effect of side holes of a double J stent on flow rate and pattern

Kim

Choi

Lee

et al. 2015

BME

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Abstract.A double J stent has been used widely these days for patients with a ureteral stenosis or with renal stones and lithotripsy. The stent has multiple side holes in the shaft, which supply detours for urine flow. Even though medical companies produce various forms of double J stents that have different numbers and positions of side holes in the stent, the function of side holes in fluid dynamics has not been studied well. Here, the flow rate and pattern around the side holes of a double J stent were evaluated in curved models of a stented ureter based on the human anatomy and straight models for comparison. The total flow rate was higher in the stent with a greater number of side holes. The inflow and outflow to the stent through the side holes in the curved ureter was more active than in the straight ureter, which means the flow through side holes exists even in the ureter without ureteral stenosis or occlusion and even in the straight ureter. When the diameter of the ureter changed, the in-stent flow rate in the ureter did not change and the extraluminal flow rate was higher in the ureter with a greater diameter.

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Section: Introductionmentioning

confidence: 99%

Numerical analysis of the effect of side holes of a double J stent on flow rate and pattern

Kim

Choi

Lee

et al. 2015

BME

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“…That characteristic may block adequate flow through catheter, but this happens on others biodegradable biomaterials. There is a study where the catheter sustained its patency for only two days [10]. When the tubes were manufactured we used distilled water to mold them, so we already expected that change.…”

Section: Discussionmentioning

confidence: 99%

“…A Foley's catheter implanted patient has 100% chance developing bacterial colonization in 30 days term [8]. Despite existence of various biomaterials such as latex (polyisoprene), polyethylene, polyvinylchloride (PVC), polyurethane, silicone, biodegradables ones, and those made from heterologous and autologous tissue, the ideal biomaterial for endourological purpose was not discovered [4] [9] [10]. Which characteristics does it must have?…”

Section: Introductionmentioning

confidence: 99%

A New Biomaterial for Urinary Catheters

Lima¹,

Lima²,

Aguiar³

et al. 2018

JBNB

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Several studies argue that an ideal biomaterial for urinary catheters is utopian. Based in literature review it seems to be true. However, research advances: the biomaterial itself, new designs, new coatings, associated drugs, etc. Once implanted and interacting with urine, two old problems persist: encrustation and bacterial colonization. In this context, an extracellular product from bacterial synthesis on sugarcane molasses biomaterial has been studied in several experimental and clinical studies. Based on its high biocompatibility, the aim of this study is to evaluate its performance in an in vivo model as an endourologic prosthesis implanted in the bladder of Wistar rats. We evaluate physical, chemical and biological phenomena in comparison to an already established biomaterial, polyurethane. Even though it is not a finished product, the sugarcane biopolymer presented similar performance compared to polyurethane in several analyzed parameters and has an important characteristic: low cost.

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“…Coating of stent surface can modify these processes. Hyaluronic acid and covalently bound heparin are inhibitors of nucleation, growth and aggregation of salts and its presence leads to delayed encrustation vs. non-coated PU stents [10,11].…”

Section: Discussionmentioning

confidence: 99%