Double-Layered PTFE-Covered Nitinol Stents: Experience in 32 Patients with Malignant Esophageal Strictures

Journal Article · Sun Aug 15 00:00:00 EDT 2010 · Cardiovascular and Interventional Radiology

DOI:https://doi.org/10.1007/S00270-009-9718-0· OSTI ID:21428967

Park, Jung Gu; Jung, Gyoo-Sik; Oh, Kyung Seung ^[1]; Park, Seon-Ja ^[2]

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1. Kosin University College of Medicine, Department of Radiology (Korea, Republic of)
2. Kosin University College of Medicine, Department of Internal Medicine (Korea, Republic of)

We evaluated the effectiveness of a double-layered polytetrafluoroethylene (PTFE)-covered nitinol stent in the palliative treatment of malignant esophageal strictures. A double-layered PTFE-covered nitinol stent was designed to reduce the propensity to migration of conventional covered stent. The stent consists of an inner PTFE-covered stent and an outer uncovered nitinol stent tube. With fluoroscopic guidance, the stent was placed in 32 consecutive patients with malignant esophageal strictures. During the follow-up period, the technical and clinical success rates, complications, and cumulative patient survival and stent patency were evaluated. Stent placement was technically successful in all patients, and no procedural complications occurred. After stent placement, the symptoms of 30 patients (94%) showed improvement. During the mean follow-up of 103 days (range, 9-348 days), 11 (34%) of 32 patients developed recurrent symptoms due to tumor overgrowth in five patients (16%), tumor ingrowth owing to detachment of the covering material (PTFE) apart from the stent wire in 3 (9%), mucosal hyperplasia in 2 (6%), and stent migration in 1 (3%). Ten of these 11 patients were treated by means of placing a second covered stent. Thirty patients died, 29 as a result of disease progression and 1 from aspiration pneumonia. The median survival period was 92 days. The median period of primary stent patency was 190 days. The double-layered PTFE-covered nitinol stent seems to be effective for the palliative treatment of malignant esophageal strictures. We believe that the double-layer configuration of this stent can contribute to decreasing the stent's migration rate.

• OSTI ID: 21428967
• Journal Information: Cardiovascular and Interventional Radiology, Vol. 33, Issue 4; Other Information: DOI: 10.1007/s00270-009-9718-0; Copyright (c) 2010 Springer Science+Business Media, LLC and the Cardiovascular and Interventional Radiological Society of Europe (CIRSE); ISSN 0174-1551
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
62 RADIOLOGY AND NUCLEAR MEDICINE
ESOPHAGUS
NEOPLASMS
NICKEL ALLOYS
TEFLON
TITANIUM ALLOYS
TUBES
ALLOYS
BODY
DIGESTIVE SYSTEM
DISEASES
FLUORINATED ALIPHATIC HYDROCARBONS
HALOGENATED ALIPHATIC HYDROCARBONS
MATERIALS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC POLYMERS
ORGANS
PETROCHEMICALS
PETROLEUM PRODUCTS
PLASTICS
POLYETHYLENES
POLYMERS
POLYOLEFINS
POLYTETRAFLUOROETHYLENE
SYNTHETIC MATERIALS
TRANSITION ELEMENT ALLOYS