Partially polyurethane-covered stent for cerebral aneurysm treatment.
Partially polyurethane-covered stent (PPCS) is proposed for the treatment of cerebral aneurysms. The PPCSs were observed to substantially modify the flow entering the aneurysm in a patient-specific aneurysm phantom (PSAP). These stents can act as flow modulators and the polyurethane (PU) membrane can provide a smooth scaffold for restoring the structural integrity of the diseased vessel. Partial coating of the stent aids in sealing only the entrance to the aneurysm while keeping the perforators around the aneurysm open and patent. Biocompatibility of the PU membrane was monitored using contact angle measurements to show that critical surface tension (CST) values remained in the thromboresistant range of 20-30 mN/m. Stent flexibility, stiffness, and pressure-diameter relationship showed no significant change after asymmetric PU film application. No delamination of the PU membrane from the stent was observed within the working strains of the stent. The flow modulating capability of the PPCS was monitored by intentionally orienting the stent to cover either the proximal or the distal regions along the neck of the PSAP. Time density curves (TDCs) compared the relative metrics of input rate, washout rate, residence time, and influx in the aneurysm before and after the stent placement.
Rangwala
Hussain S
HS
Toshiba Stroke Research Center, State University of New York at Buffalo, Buffalo, New York.|Department of Mechanical and Aerospace Engineering, State University of New York at Buffalo, Buffalo, New York.
Ionita
Ciprian N
CN
Toshiba Stroke Research Center, State University of New York at Buffalo, Buffalo, New York.|Department of Neurosurgery, State University of New York at Buffalo, Buffalo, New York.|Department of Radiology, State University of New York at Buffalo, Buffalo, New York.
Rudin
Stephen
S
Toshiba Stroke Research Center, State University of New York at Buffalo, Buffalo, New York.|Department of Neurosurgery, State University of New York at Buffalo, Buffalo, New York.|Department of Radiology, State University of New York at Buffalo, Buffalo, New York.|Department of Mechanical and Aerospace Engineering, State University of New York at Buffalo, Buffalo, New York.|Department of Physiology and Biophysics, State University of New York at Buffalo, Buffalo, New York.
Baier
Robert E
RE
Biomaterials Graduate Program, The Graduate School, State University of New York at Buffalo, Buffalo, New York.|Department of Mechanical and Aerospace Engineering, State University of New York at Buffalo, Buffalo, New York.
D019917:Blood Vessel Prosthesis Implantation; D020099:Coated Materials, Biocompatible / Q000737:chemistry; D004548:Elasticity; D006801:Humans; D002532:Intracranial Aneurysm / Q000601:surgery*; D008422:Materials Testing; D008953:Models, Anatomic; D018583:Pliability; D011140:Polyurethanes / Q000737:chemistry*; D011474:Prosthesis Design; D012039:Regional Blood Flow; D015607:Stents
D020099:Coated Materials, Biocompatible; D011140:Polyurethanes