Penetration Mechanics of Endovascular Stent Graft Barbs in Aortic Tissue

2011 ◽  
Author(s):  
Kathleen Lin ◽  
Benjamin Berkowitz ◽  
Madhavan L. Raghavan
Keyword(s):  
Stent Graft ◽  
Aortic Wall ◽  
Soft Tissues ◽  
The Body ◽  
Aortic Aneurysms ◽  
Fixation Strength ◽  
Aortic Tissue ◽  
Endovascular Stent ◽  
Penetration Mechanics ◽  
The Relationship

Endovascular stent grafts with barbs — tiny needle-like pins that provide active fixation — are increasingly used for treating aortic aneurysms and dissections. Characterization of barb penetration mechanics may help improve stent-graft designs. Barb angle varies among manufacturers (10–50°). But little is known regarding aortic wall penetration characteristics in relationship to barb angle. There is a body of work on needle insertion properties such as insertion forces into soft tissues. However, there have not been specific studies involving the aorta and the relationship between entry angle and entry force. Kratzberg et al. [1,2] demonstrated that barb angle was closely related to penetration angle and that lower angles between the barb and the body of the aortic stent-graft resulted in better penetration probability and fixation strength in the aortic wall. In order to assess why lower barb angles (i.e., barb axis closer to the graft axis) resulted in better penetration, this study investigates the relationship between barb penetration angle and aortic tissue entry force and compared it to a homogeneous control membrane made of silicone.

Endovascular Stent-Graft in Abdominal Aortic Aneurysms: The Relationship between Patent Vessels that Arise from the Aneurysmal Sac and Early Endoleak

Radiology ◽  
2001 ◽  
Vol 218 (1) ◽  
pp. 176-182 ◽  
Author(s):  
Chieh-Min Fan ◽  
Elizabeth A. Rafferty ◽  
Stuart C. Geller ◽  
John A. Kaufman ◽  
David C. Brewster ◽  
...  
Keyword(s):  
Stent Graft ◽  
Abdominal Aortic Aneurysms ◽  
Aortic Aneurysms ◽  
Endovascular Stent ◽  
Endovascular Stent Graft ◽  
Abdominal Aortic ◽  
The Relationship

scholarly journals Endovascular repair of aortic aneurysm: Preliminary results

2009 ◽  
Vol 137 (1-2) ◽  
pp. 10-17 ◽  
Author(s):  
Lazar Davidovic ◽  
Momcilo Colic ◽  
Igor Koncar ◽  
Dejan Markovic ◽  
Dusan Kostic ◽  
...  
Keyword(s):  
Abdominal Aortic Aneurysm ◽  
Aortic Aneurysm ◽  
Stent Graft ◽  
Endovascular Aneurysm Repair ◽  
Aortic Aneurysms ◽  
Endovascular Stent ◽  
Stent Grafts ◽  
Graft Thrombosis ◽  
Abdominal Aortic

Introduction. Endovascular aneurysm repair (EVAR) has been introduced into clinical practice at the beginning of the 90's of the last century. Because of economic, political and social problems during the last 25 years, the introduction of this procedure in Serbia was not possible. Objective. The aim of this study was to present preliminary experiences and results of the Clinic for Vascular Surgery of the Serbian Clinical Centre in Belgrade in endovascular treatment of thoracic and abdominal aortic aneurysms. Methods. The procedure was performed in 33 patients (3 female and 30 male), aged from 42 to 83 years. Ten patients had a descending thoracic aorta aneurysm (three atherosclerotic, four traumatic - three chronic and one acute as a part of polytrauma, one dissected, two penetrated atherosclerotic ulcers), while 23 patients had the abdominal aortic aneurysm, one ruptured and two isolated iliac artery aneurysms. The indications for EVAR were isthmic aneurismal localisation, aged over 80 years and associated comorbidity (cardiac, pulmonary and cerebrovasular diseases, previous thoracotomy or multiple laparotomies associated with abdominal infection, idiopatic thrombocitopaenia). All of these patients had three or more risk factors. The diagnosis was established using duplex ultrasonography, angiography and MSCT. In the case of thoracic aneurysm, a Medtronic-Valiant? endovascular stent graft was implanted, while for the abdominal aortic aneurysm Medtronic-Talent? endovascular stent grafts with delivery systems were used. In three patients, following EVAR a surgical repair of the femoral artery aneurysm was performed, and in another three patients femoro-femoral cross over bypass followed implantation of aortouniiliac stent graft. Results. During procedure and follow-up period (mean 1.6 years), there were: one death, one conversion, one endoleak type 1, six patients with endoleak type 2 that disappeared during the follow-up period, one early graft thrombosis. No other complications, including aneurysm expansion, collapse, deformity and migration of the endovascular stent grafts, were registered. Conclusion. According to all medical and economic aspects, we recommend EVAR to treat acute traumatic thoracic aortic aneurysm, as well as in elderly and high-risk patients with abdominal or thoracic aneurysms, when open surgery is related to a significantly higher mortality and morbidity.

Open Versus Endovascular Stent Graft Repair of Abdominal Aortic Aneurysms

Angiology ◽  
2013 ◽  
Vol 65 (8) ◽  
pp. 677-682 ◽  
Author(s):  
Belal Firwana ◽  
Mazen Ferwana ◽  
Rim Hasan ◽  
Martin A. Alpert ◽  
Peter Faries ◽  
...  
Keyword(s):  
Stent Graft ◽  
Abdominal Aortic Aneurysms ◽  
Aortic Aneurysms ◽  
Endovascular Stent ◽  
Endovascular Stent Graft ◽  
Abdominal Aortic ◽  
Stent Graft Repair ◽  
Open Versus ◽  
Endovascular Stent Graft Repair

Clinical results of endovascular stent graft repair for fifty cases of thoracic aortic aneurysms

1998 ◽  
Vol 46 (10) ◽  
pp. 971-975 ◽  
Author(s):  
Satoshi Kawaguchi ◽  
Shin Ishimaru ◽  
Taro Shimazaki ◽  
Yoshihiko Yokoi ◽  
Nobusato Koizumi ◽  
...  
Keyword(s):  
Stent Graft ◽  
Clinical Results ◽  
Aortic Aneurysms ◽  
Endovascular Stent ◽  
Endovascular Stent Graft ◽  
Thoracic Aortic Aneurysms ◽  
Stent Graft Repair ◽  
Endovascular Stent Graft Repair

Development of an In Vitro Porcine Aorta Model to Study the Stability of Stent Grafts in Motor Vehicle Accidents

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Kurosh Darvish ◽  
Mehdi Shafieian ◽  
Vasily Romanov ◽  
Vittorio Rotella ◽  
Michael D. Salvatore ◽  
...  
Keyword(s):  
Stent Graft ◽  
Motor Vehicle ◽  
Motor Vehicle Accidents ◽  
Aortic Aneurysms ◽  
Endovascular Stent ◽  
Stent Grafts ◽  
Vehicle Accidents ◽  
Impact System ◽  
The Stability

Endovascular stent grafts for the treatment of thoracic aortic aneurysms have become increasingly utilized and yet their locational stability in moderate chest trauma is unknown. A high speed impact system was developed to study the stability of aortic endovascular stent grafts in vitro. A straight segment of porcine descending aorta with stent graft was constrained in a custom-made transparent urethane casing. The specimen was tested in a novel impact system at an anterior inclination of 45deg and an average deceleration of 55G, which represented a frontal automobile crash. Due to the shock of the impact, which was shown to be below the threshold of aortic injury, the stent graft moved 0.6mm longitudinally. This result was repeatable. The presented experimental model may be helpful in developing future grafts to withstand moderate shocks experienced in motor vehicle accidents or other dynamic loadings of the chest.

Sign in / Sign up

Export Citation Format

Share Document