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Ledenko M, Toskich B, Mehner C, Ceylan H, Patel T. Therapeutic biliary stents: applications and opportunities. Expert Rev Med Devices 2024; 21:399-409. [PMID: 38716580 DOI: 10.1080/17434440.2024.2341960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Accepted: 04/08/2024] [Indexed: 05/31/2024]
Abstract
INTRODUCTION Biliary stents are used to optimize ductal patency and enable bile flow in the management of obstruction or injury related to biliary tract tumors, strictures, stones, or leaks. Although direct therapeutic applications of biliary stents are less well developed, stents can be used to deliver drugs, radioisotopes, and photodynamic therapy. AREAS COVERED This report provides an in-depth overview of the clinical indications, and therapeutic utility of biliary stents. Unique considerations for the design of biliary stents are described. The properties and functionalities of materials used for stents such as metal alloys, plastic polymers, or biodegradable materials are described, and opportunities for design of future stents are outlined. Current and potential applications of stents for therapeutic applications for biliary tract diseases are described. EXPERT OPINION Therapeutic biliary stents could be used to minimize inflammation, prevent stricture formation, reduce infections, or provide localized anti-cancer therapy for biliary tract cancers. Stents could be transformed into therapeutic platforms using advanced materials, 3D printing, nanotechnology, and artificial intelligence. Whilst clinical study and validation will be required for adoption, future advances in stent design and materials are expected to expand the use of therapeutic biliary stents for the treatment of biliary tract disorders.
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Affiliation(s)
- Matthew Ledenko
- Department of Transplantation, Division of Gastroenterology and Hepatology, Mayo Clinic, Jacksonville, FL, USA
| | - Beau Toskich
- Department of Radiology, Mayo Clinic, Jacksonville, FL, USA
| | - Christine Mehner
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Jacksonville, FL, USA
| | - Hakan Ceylan
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Jacksonville, FL, USA
| | - Tushar Patel
- Department of Transplantation, Division of Gastroenterology and Hepatology, Mayo Clinic, Jacksonville, FL, USA
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Jacksonville, FL, USA
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Xu X, Zhang Y, Zheng W, Wang Y, Yao W, Li K, Yan X, Chang H, Huang Y. Enteral extended biliary stents versus conventional plastic biliary stents for the treatment of extrahepatic malignant biliary obstruction: a single-center prospective randomized controlled study. Surg Endosc 2022; 36:8202-8213. [PMID: 35536485 DOI: 10.1007/s00464-022-09265-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Accepted: 04/09/2022] [Indexed: 02/07/2023]
Abstract
BACKGROUND AND AIMS The main limitation of plastic stents is the relatively short stent patency due to occlusion. We designed enteral extended biliary stents with lengths of 26 cm (EEBS-26 cm) and 30 cm (EEBS-30 cm) to prolong stent patency. This study aimed to compare patency among EEBS-26 cm, EEBS-30 cm, and conventional plastic biliary stent (CPBS). METHODS A single-center prospective randomized controlled study was conducted. Eligible patients were randomized into the EEBS-26 cm, EEBS-30 cm, and CPBS groups, respectively. All patients were followed up every 3 months until stent occlusion, patient death, or at 12-month follow-up. The primary outcome was stent patency. The secondary outcomes included stent occlusion rate, patient survival, mortality, the rate of technical success, and adverse events. RESULTS Totally 117 patients were randomized into the three groups. There were no significant differences among the three groups in technical success rate, hospital stay, mortality, patient survival, and adverse events (P = 1.000, 0.553, 0.965, 0.302, and 0.427, respectively). Median stent patency durations in the EEBS-26 cm, EEBS-30 cm, and CPBS groups were 156.0 (95% CI 81.6-230.4) days, 81.0 (95% CI 67.9-94.1) days, and 68.0 (95% CI 20.0-116.0) days, respectively (P = 0.002). The EEBS-26 cm group had longer stent patency compared with the CPBS (P = 0.007) and EEBS-30 cm (P < 0.001) groups. The EEBS-26 cm group had lower stent occlusion rates compared with the other groups at 6 months (48.1% vs. 90.5% vs. 82.8%, P = 0.001) and 9 months (75.0% vs. 100.0% vs. 92.9%, P = 0.022). CONCLUSION EEBS-26 cm has prolonged stent patency and is safe and effective for the alleviation of unresectable extrahepatic malignant biliary obstruction.
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Affiliation(s)
- Xiaofen Xu
- The Department of Gastroenterology, Peking University Third Hospital, Haidian District, 49 Huayuan North Road, Beijing, China
| | - Yaopeng Zhang
- The Department of Gastroenterology, Peking University Third Hospital, Haidian District, 49 Huayuan North Road, Beijing, China
| | - Wei Zheng
- The Department of Gastroenterology, Peking University Third Hospital, Haidian District, 49 Huayuan North Road, Beijing, China
| | - Yingchun Wang
- The Department of Gastroenterology, Peking University Third Hospital, Haidian District, 49 Huayuan North Road, Beijing, China
| | - Wei Yao
- The Department of Gastroenterology, Peking University Third Hospital, Haidian District, 49 Huayuan North Road, Beijing, China
| | - Ke Li
- The Department of Gastroenterology, Peking University Third Hospital, Haidian District, 49 Huayuan North Road, Beijing, China
| | - Xiue Yan
- The Department of Gastroenterology, Peking University Third Hospital, Haidian District, 49 Huayuan North Road, Beijing, China.
| | - Hong Chang
- The Department of Gastroenterology, Peking University Third Hospital, Haidian District, 49 Huayuan North Road, Beijing, China.
| | - Yonghui Huang
- The Department of Gastroenterology, Peking University Third Hospital, Haidian District, 49 Huayuan North Road, Beijing, China.
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Su Y, Xiang Z, Song X, Zheng S, Xu X. Design and Optimization of a New Anti-reflux Biliary Stent With Retractable Bionic Valve Based on Fluid-Structure Interaction Analysis. Front Bioeng Biotechnol 2022; 10:824207. [PMID: 35419358 PMCID: PMC8995556 DOI: 10.3389/fbioe.2022.824207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 03/14/2022] [Indexed: 11/13/2022] Open
Abstract
Duodenal biliary reflux has been a challenging common problem which could cause dreadful complications after biliary stent implantation. A novel anti-reflux biliary stent with a retractable bionic valve was proposed according to the concertina motion characteristics of annelids. A 2D equivalent fluid-structure interaction (FSI) model based on the axial section was established to analyze and evaluate the mechanical performances of the anti-reflux biliary stent. Based on this model, four key parameters (initial shear modulus of material, thickness, pitch, and width) were selected to investigate the influence of design parameters on anti-reflux performance via an orthogonal design to optimize the stent. The results of FSI analysis showed that the retrograde closure ratio of the retractable valve primarily depended on initial shear modulus of material (p < 0.05) but not mainly depended on the thickness, pitch, and width of the valve (p > 0.05). The optimal structure of the valve was finally proposed with a high retrograde closing ratio of 95.89%. The finite element model revealed that the optimized anti-reflux stent possessed improved radial mechanical performance and nearly equal flexibility compared with the ordinary stent without a valve. Both the FSI model and experimental measurement indicated that the newly designed stent had superior anti-reflux performance, effectively preventing the duodenobiliary reflux while enabling the bile to pass smoothly. In addition, the developed 2D equivalent FSI model provides tremendous significance for resolving the fluid-structure coupled problem of evolution solid with large deformation and markedly shortens the calculation time.
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Affiliation(s)
- Yushan Su
- Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin, China
| | - Zhongxia Xiang
- Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin, China
| | - Xiaofei Song
- Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin, China
- *Correspondence: Xiaofei Song,
| | - Shuxian Zheng
- Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education, Tianjin University, Tianjin, China
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Yuan XL, Ye LS, Zeng XH, Tan QH, Mou Y, Liu W, Wu CC, Yang H, Hu B. New anti-reflux plastic stent to reduce the risk of stent-related cholangitis in the treatment of biliary strictures. World J Gastroenterol 2021; 27:4697-4709. [PMID: 34366630 PMCID: PMC8326253 DOI: 10.3748/wjg.v27.i28.4697] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 06/08/2021] [Accepted: 07/07/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND There is little data available on the role of new anti-reflux plastic stents (ARPSs).
AIM To compare the use of ARPSs with that of traditional plastic stents (TPSs) for patients with biliary strictures.
METHODS Consecutive patients with biliary strictures who underwent first endoscopic biliary stenting between February 2016 and May 2019 were included. The onset of stent-related cholangitis, stent patency, clinical success, and other adverse events were evaluated.
RESULTS Sixty-seven patients in the ARPS group and 66 patients in the TPS group were included in the final analyses. Fewer patients experienced stent-related cholangitis in the ARPS group than that in the TPS group (8 patients vs 18 patients; P = 0.030). The median time till the onset of first stent-related cholangitis was later in the ARPS group than that in the TPS group (128.5 d vs 76 d; P = 0.039). The cumulative median stent patency in the ARPS group was 185 d, which was significantly longer than that in the TPS group (133 d; P = 0.001). The clinical success rates and other adverse events did not significantly differ between both groups.
CONCLUSION Placement of new ARPS might be a safe and effective optional therapeutic strategy to reduce the risk of stent-related cholangitis and prolong stent patency.
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Affiliation(s)
- Xiang-Lei Yuan
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Lian-Song Ye
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Xian-Hui Zeng
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Qing-Hua Tan
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Yi Mou
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Wei Liu
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Chun-Cheng Wu
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Hang Yang
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
| | - Bing Hu
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, Sichuan Province, China
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Hamada T, Nakai Y, Isayama H, Koike K. Antireflux metal stent for biliary obstruction: Any benefits? Dig Endosc 2021; 33:310-320. [PMID: 32250476 DOI: 10.1111/den.13679] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Revised: 03/10/2020] [Accepted: 03/26/2020] [Indexed: 12/12/2022]
Abstract
Endoscopic retrograde cholangiopancreatography with stent placement has been utilized as standard palliative management of distal malignant biliary obstruction (MBO). Compared to plastic stents, metal stents can provide longer-term relief of symptoms. When a large-bore metal stent is placed across the ampulla, patients are predisposed to the risk of cholangitis or stent dysfunction due to reflux of duodenal contents. To mitigate the risk of adverse events associated with the duodenobiliary reflux, efforts have been directed to development of antireflux metal stents (ARMSs). The antireflux property has been introduced through adding of an antireflux valve to the duodenal stent end. Evidence from clinical studies indicates that ARMSs may not only reduce the risk of ascending cholangitis during follow-up but also prolong stent patency time. However, the results of clinical studies testing ARMSs are inconsistent owing to heterogeneous designs of antireflux valves and stent bodies. Metal stents are increasingly indicated for benign biliary strictures and MBO in the setting of neoadjuvant chemotherapy, and therefore, research is warranted to evaluate ARMSs for those indications. Given that endoscopic ultrasound (EUS)-guided transmural biliary drainage has gained popularity, the optimal timing of placing an ARMS in relation to EUS-guided and percutaneous drainage should be investigated. Development and evaluation of ARMSs require an integrative approach utilizing phantom and animal models, measurements of stent mechanical properties, and in vivo functional study after stent placement. In this review article, we summarize updated evidence on ARMSs for MBO and discuss issues that should be addressed in future studies.
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Affiliation(s)
- Tsuyoshi Hamada
- Departments of, Department of, Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Yousuke Nakai
- Departments of, Department of, Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.,Department of, Endoscopy and Endoscopic Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Hiroyuki Isayama
- Department of Gastroenterology, Graduate School of Medicine, Juntendo University, Tokyo, Japan
| | - Kazuhiko Koike
- Departments of, Department of, Gastroenterology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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