Elastic Deformation Properties of Implanted Endobronchial Wire Stents in Benign and Malignant Bronchial Disease: A Radiographic In Vivo Evaluation

Journal Article · Mon Mar 15 04:00:00 EST 1999 · Cardiovascular and Interventional Radiology

DOI:https://doi.org/10.1007/S002709900343· OSTI ID:21080332

Hautmann, Hubert ^[1]; Rieger, Johannes ^[2]; Huber, Rudolf M ^[1]; Pfeifer, Klaus J ^[2]

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1. Medizinische Klinik, Klinikum Innenstadt, Ludwig-Maximilians-University, Ziemssentrasse 1, D-80336 Munich (Germany)
2. Radiologische Klinik, Klinikum Innenstadt, Ludwig-Maximilians-University, Ziemssentrasse 1, D-80336 Munich (Germany)

Purpose: To evaluate the long-term mechanical behavior in vivo of expandable endobronchial wire stents, we imaged three different prostheses in the treatment of tracheobronchial disease. Methods: Six patients with bronchial stenoses (three benign, three malignant) underwent insertion of metallic stents. Two self-expandable Wallstents, two balloon-expandable tantalum Strecker stents and two self-expandable nitinol Accuflex stents were used. Measurements of deformation properties were performed during voluntary cough by means of fluoroscopy, at 1 month and 7-10 months after implantation. The procedures were videotaped, their images digitized and the narrowing of stent diameters calculated at intervals of 20 msec. Results: After stent implantation all patients improved with respect to ventilatory function. Radial stent narrowing during cough reached 53% (Wallstent), 59% (tantalum Strecker stent), and 52% (nitinol Accuflex stent) of the relaxed post-implantation diameter. Stent compression was more marked in benign compared with malignant stenoses. In the long term permanent deformation occurred with the tantalum Strecker stents; the other stents were unchanged. Conclusion: Endobronchial wire stents can be helpful in the treatment of major airway collapse and obstructing bronchial lesions. However, evidence of material fatigue as a possible effect of exposure to recurrent mechanical stress on the flexible mesh tube may limit their long-term use. This seems to be predominantly important in benign bronchial collapse.

• OSTI ID: 21080332
• Journal Information: Cardiovascular and Interventional Radiology, Journal Name: Cardiovascular and Interventional Radiology Journal Issue: 2 Vol. 22; ISSN 0174-1551; ISSN CAIRDG
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
DEFORMATION
EVALUATION
FATIGUE
FLUOROSCOPY
IMAGES
IN VIVO
NICKEL ALLOYS
PATIENTS
TITANIUM ALLOYS
VASCULAR DISEASES
WIRES