Experimental evaluation of drainage properties of polymer stents under mechanical compression. Standard and tandem stenting

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Aim. To assess the resistance to the mechanical compression of single and tandem stents.

Materials and methods. An in vitro model of the ureter using a silicone tube connecting the proximal and distal reservoirs was assembled. The proximal reservoir was sealed and connected to a pressure gauge. Stents were placed sequentially in the lumen of the tube. A part of the model of ureter was passed through a compression platform which had a length of 4 cm, a bending angle of 35–40° and the ability to apply variable pressure. Five different 7 Ch polymer ureteral stents were tested in single and tandem manner. The compression force was applied and measured at the level of the compression platform. A criterion of stent failure was an increase of the pressure in proximal reservoir over 20 cm H2O with irrigation of saline at a rate of 30 ml/hour.

Results. Measurements were performed in 11 variants, including without a stent, with single stent (5) and with tandem stents (5). Polyurethane stents showed the least resistance to mechanical compression. In case of tandem stenting, all stents demonstrated an increase in resistance to compression compared to a single stent.

Conclusions. Polymer stents are more resistant to mechanical compression compared to polyurethane ones. Tandem stenting can be an effective tool to counteract the compression by the tumor.

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作者简介

Ibragim Mamaev

FGAOU VO N.I. Pirogov Russian National Research Medical University of the Ministry of Health of Russia; GBUZ “Moscow City Clinical Hospital named after V.M. Buyanov”

编辑信件的主要联系方式.
Email: dr.mamaev@mail.ru
ORCID iD: 0000-0002-5755-5950

Ph.D., associate professor at the Department of Urology and Andrology, Head of the Department of Urology, Assistant professor of the Department of Urology

 

俄罗斯联邦, 117997, Moscow, st. Ostrovityanova, 1; 115560, Moscow, Bakinskaya st., 26

Kirill Glinin

FGAOU VO N.I. Pirogov Russian National Research Medical University of the Ministry of Health of Russia; GBUZ “Moscow City Clinical Hospital named after V.M. Buyanov”

Email: glinin.doc@gmail.com
ORCID iD: 0000-0002-1989-3254

assistant at the Department of Urology and Andrology, Urologist at the Department of Urology

俄罗斯联邦, 117997, Moscow, st. Ostrovityanova, 1; 115560, Moscow, Bakinskaya st., 26

Sergey Kotov

FGAOU VO N.I. Pirogov Russian National Research Medical University of the Ministry of Health of Russia

Email: urokotov@mail.ru
ORCID iD: 0000-0003-3764-6131

Ph.D., MD, professor, Head of the Department of Urology and Andrology

俄罗斯联邦, 117997, Moscow, st. Ostrovityanova, 1

参考

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2. Fig. 1. General view of the experimental setup

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3. Fig. 2. Modeling of the stenotic section of the ureter

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4. Fig. 3. HTi HT-1890 manometer for measuring pressure in the proximal reservoir (A). Shahe AMF series 100 manometer monitoring external pressure on the ureter model (B)

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5. Рис. 4. Система со стентом Coloplast PU; А — верхняя колба тандемное стентирование; Б — нижняя колба одиночное стентирование

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6. Fig. 5. System with Urotech Yellow-Star PC stent; A — upper bulb tandem stenting; B — lower bulb single stenting

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7. Fig. 6. System with Boston Scientific Tria stent; A - upper bulb tandem stenting; B - lower bulb single stenting

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8. Fig. 7. System with Coloplast Vortek Tumor Stent; A — upper bulb single stenting; B — lower bulb tandem stenting

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9. Fig. 8. System with Marflow Tecoflex Tumor Stent; A — upper bulb tandem stenting; B — lower bulb single stenting

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10. Fig. 9. Schematic representation of additional drainage spaces (highlighted in red) between parallel stents in the ureter

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