Evaluation of a New Self-expandable Silicone Stent in an Experimental Tracheal Stenosis

Bolliger, Chris T.; Wyser, C; Wu, X M; Häuser, Roman; Studer, Wolfgang; Dalquen, Peter; Perruchoud, André P.

doi:10.1378/chest.115.2.496

Cited by 44 publications

(31 citation statements)

References 12 publications

(17 reference statements)

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“…(12) The tracheal stenosis was induced according to technique developed by another group of authors, (7) who evaluated the aspects related to the application of stents and their short-term results. They concluded that the stent, from a technical point of view, is easy to insert and remove.…”

Section: Discussionmentioning

confidence: 99%

“…(9)(10)(11) Their removal is problematic and can cause severe complications, such as profuse bleeding. (12,13) Considering the pros and cons of both types of stents available, the self-expanding stent made of polyester mesh with silicon coating (Polyflex ® stent) as a device that is easy to insert/remove, rarely migrates, causes few granulomatous tissue reactions and presents a favorable relationship between the external and internal diameters (Figures 1 and 2). Experimental studies demonstrated that this stent is easy to insert, effective and well tolerated.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental studies demonstrated that this stent is easy to insert, effective and well tolerated. (12,14) The aim of this study was to evaluate the ease of insertion and safety of the self-expanding stents with silicon coating (Polyflex ® stent) in the treatment of patients with tracheal stenoses of benign and malignant etiology who were non-candidates for definitive surgical treatment. were suffering from tracheal stenosis of benign or malignant etiology and were submitted to the insertion of 21 self-expanding stents with silicon coating.…”

Section: Introductionmentioning

confidence: 99%

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Endoprótese auto-expansível de malha de poliéster revestida por silicone (Polyflex®) no tratamento de estenoses traqueais não-cirúrgicas

et al. 2007

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Objective: To evaluate the Polyflex ® stent in terms of its efficacy, ease of implantation, and complications in patients with tracheobronchial affections. Methods: This was a prospective study, in which sixteen patients with inoperable tracheal stenosis secondary to orotracheal intubation (n = 12), neoplasia (n = 3), or Wegener's granulomatosis (n = 1) were monitored. Of these patients, eleven were women, and five were men. The mean age was 42.8 years (range, 21-72 years). Patients were submitted to implantation of a total of 21 Polyflex ® stents. All procedures were carried out in the operating room under general anesthesia, and the stents were implanted via suspension laryngoscopy using the stent applicator. Results: Stents were implanted and symptoms were resolved in all cases. The stents remained in place for a mean period of 7.45 months, ranging from 2 to 18 months. The complications observed in the immediate postoperative period were dysphonia (in two patients, 12.5%) and odynophagia (in two patients, 12.5%). Late complications were cough (in ten patients, 62.5%), migration (in seven patients, 43.75%), granuloma formation (in two patients, 12.5%), and pneumonia (in one patient, 6.25%). Conclusion: The Polyflex ® stent is easily implanted, easily removed, well tolerated by patients and effective in resolving symptoms. However, its use is associated with a high rate of migration, especially in patients with post-orotracheal intubation stenosis.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Endoprótese auto-expansível de malha de poliéster revestida por silicone (Polyflex®) no tratamento de estenoses traqueais não-cirúrgicas

et al. 2007

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“…Many researchers have studied the applications of tracheal stents in biomedical engineering [3][4][5][6][7][8][9][10]. Montgomery proposed T-tube tracheal stent firstly [3].…”

Section: Introductionmentioning

confidence: 99%

“…Yanagihara et al treated the tracheal stenosis with self-expanding nitinol stent [7]. Bolliger, et al applied a new self-expandable silicone stent in an experimental tracheal stenosis [8]. Vergnon, et al evaluated preliminarily the efficacy and tolerance of a new silicone stent for the treatment of benign tracheal stenosis [9].…”

Section: Introductionmentioning

confidence: 99%

Study on loss mechanism of SMA tracheal stent subjected to cough excitation

Zhu

2015

BME

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Abstract.A kind of Ti-Ni shape memory alloy (SMA) hysteretic nonlinear model is developed, and the loss mechanism of a SMA tracheal stent subjected to cough excitation is studied in this paper. Nonlinear differential items are introduced to express the hysteretic phenomena of Ti-Ni SMA, and the fitting effect of the SMA constitutive model on the experimental data is proved by the partial least-square regression method. The nonlinear dynamic model of a Ti-Ni SMA tracheal stent subjected to cough excitation is developed, and the system's dynamic response is obtained. The numerical results show that the system's vibration is little in weak excitation, becomes large with the increase of the stochastic excitation, and finally becomes little again with the further increase of the stochastic excitation; the stochastic resonance phenomenon occurs in the process, which may cause stent fracture or loss.

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Development and in vivo testing of a Nitinol tracheal stent

et al. 2007

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This article describes the development of a Nitinol tracheal stent (HCPA NiTi-stent) and its application in a feline animal model. Straight-annealed, bright-polished Nitinol wire (55.8%Ni-44.2%Ti) was weaved around a 40-mm-long metal fixture with 8-mm diameter. The prototypes were submitted to different times of shape-setting heat treatment (530 degrees C), which resulted in stents of different colors and caused some variation in length and diameter. The prototypes were then submitted to compression testing, and the most resistant pieces, requiring the greatest force to achieve a 25% reduction in diameter and presenting the least variation in length and diameter (dark blue, 9 min of heat treatment), were submitted to fatigue testing. After that, only dark blue stents were manufactured and implanted in felines. No migration, tracheal stenosis, or any other type of damage were observed after 40 weeks. The integrity of the tracheal wall in contact with the stent was confirmed by macro and microscopic analyses. The development and in vivo testing of the HCPA NiTi-stent were successful.

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Evaluation of a New Self-expandable Silicone Stent in an Experimental Tracheal Stenosis

Cited by 44 publications

References 12 publications

Endoprótese auto-expansível de malha de poliéster revestida por silicone (Polyflex®) no tratamento de estenoses traqueais não-cirúrgicas

Endoprótese auto-expansível de malha de poliéster revestida por silicone (Polyflex®) no tratamento de estenoses traqueais não-cirúrgicas

Study on loss mechanism of SMA tracheal stent subjected to cough excitation

Development and in vivo testing of a Nitinol tracheal stent

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