First experimental results with a new type of stent: the double-coil device.
OBJECTIVE
To introduce a new stent design and evaluate its technical properties.


METHODS
This stent consists of two nitinol wires partially connected to each other. After delivery through a catheter a tube-like helical stent forms within the artery. After experimental tests in flow models regarding mechanical properties, introduction and delivery technique, 15 stents were implanted into iliac, femoral, and carotid arteries of seven dogs. After 3-12 weeks angiographic follow-up stents were explanted for microscopic examination.


RESULTS
Stents with expanded diameters of 5-10 mm can be introduced through a 5 Fr catheter with 0.038 inch luminal diameter. Thrombotic vessel occlusion was observed in one iliac artery after incorrect stent placement with diameter mismatch. Fourteen of 15 stents remained patent and revealed minor intimal hyperplasia in the areas of the stent strut connection points as well as some reduction in medial thickness.


CONCLUSIONS
This new stent design has a small introduction diameter which is independent of the expanded diameter. The stent's principal characteristics may serve as a basis for further special developments.
Strecker
Ernst-Peter
EP
Department of Diagnostic Imaging, Interventional Radiology and Nuclear Medicine, Diakonissenkrankenhaus Karlsruhe, Diakonissenstrasse 28, D-76199 Karlsruhe, Germany. radiologie@diak-ka.de
Song
Ho-Young
HY
Kang
Sung-Gwon
SG
Dongming
Hou
H
Schumacher
M
M
D000818:Animals; D001807:Blood Vessel Prosthesis; D020099:Coated Materials, Biocompatible; D004285:Dogs; D004867:Equipment Design; D004869:Equipment Safety; D005263:Femoral Artery / Q000000981:diagnostic imaging / Q000601:surgery; D005500:Follow-Up Studies; D006965:Hyperplasia / Q000000981:diagnostic imaging; D007083:Iliac Artery / Q000000981:diagnostic imaging / Q000601:surgery; D023421:Models, Animal; D008955:Models, Cardiovascular; D011859:Radiography; D015607:Stents; D016896:Treatment Outcome; D017539:Tunica Intima / Q000000981:diagnostic imaging / Q000473:pathology
D020099:Coated Materials, Biocompatible