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https://www.readbyqxmd.com/read/28104422/tipless-nitinol-stone-baskets-comparison-of-penetration-force-radial-dilation-force-opening-dynamics-and-deflection
#1
Nishant Patel, Arash Akhavein, Bryan Hinck, Rajat Jain, Manoj Monga
OBJECTIVE: To evaluate 5 commercially available tipless nitinol baskets (2.2F) in 4performance factors: penetration force, radial dilation force, opening dynamics and deflection limitation. MATERIAL AND METHODS: The 2.2F Coloplast Dormia No-Tip®, 1.5F Sacred Heart Medical Halo®, 2.2F Cook NCircle Nitinol Tipless Stone Extractor ®, 1.9F Bard SkyLite Tipless Nitinol Basket® and the 1.9F Boston Scientific Zero TipTM baskets were tested for penetration force (safety metric), radial dilation force (functional metric for ureteral calculi), and opening/closing dynamics...
January 16, 2017: Urology
https://www.readbyqxmd.com/read/28095767/in-vivo-quantification-of-the-deformations-of-the-femoropopliteal-segment
#2
Can Gökgöl, Steffen Schumann, Nicolas Diehm, Guoyan Zheng, Philippe Büchler
PURPOSE: To quantify the deformations of the femoropopliteal (FP) segment in patients undergoing endovascular revascularization and to compare the posttreatment deformations caused by primary nitinol stent implantation to those produced by percutaneous transluminal angioplasty (PTA). METHODS: Thirty-five patients (mean age 69±10 years; 20 men) scheduled for endovascular therapy were recruited for the study. During endovascular interventions, angiographic images were acquired with the legs straight and with a hip/knee flexion of 20°/70°...
February 2017: Journal of Endovascular Therapy
https://www.readbyqxmd.com/read/28070228/design-fabrication-and-testing-of-a-needle-sized-wrist-for-surgical-instruments
#3
Philip J Swaney, Peter A York, Hunter B Gilbert, Jessica Burgner-Kahrs, Robert J Webster
This paper presents a miniature wrist that can be integrated into needle-sized surgical instruments. The wrist consists of a nitinol tube with asymmetric cutouts that is actuated by a single tendon to provide high distal curvature. We derive and experimentally validate kinematic and static models for the wrist and describe several prototype wrists, illustrating the straightforward fabrication and scalability of the design. We experimentally investigate fatigue life, the concept of tip-first bending, and practical use of the wrist with a concentric tube robot in an endonasal surgical scenario...
March 2017: Journal of Medical Devices
https://www.readbyqxmd.com/read/28047715/we-de-201-08-multi-source-rotating-shield-brachytherapy-apparatus-for-prostate-cancer
#4
H Dadkhah, X Wu, Y Kim, R Flynn
PURPOSE: To introduce a novel multi-source rotating shield brachytherapy (RSBT) apparatus for the precise simultaneous angular and linear positioning of all partially-shielded 153Gd radiation sources in interstitial needles for treating prostate cancer. The mechanism is designed to lower the detrimental dose to healthy tissues, the urethra in particular, relative to conventional high-dose-rate brachytherapy (HDR-BT) techniques. METHODS: Following needle implantation, the delivery system is docked to the patient template...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046531/tu-h-206-08-quantitative-impact-of-biliary-stent-artefacts-on-mr-images
#5
O Gurney-Champion, T Bruins Slot, E Lens, A van der Horst, R Klaassen, H van Laarhoven, J van Hooft, A Nederveen, A Bel
PURPOSE: Biliary stents may cause artifacts in MR-images. These artifacts are caused by differences in susceptibility (artifact-1), eddy currents during read-out (artifact-2) and eddy currents due to the excitation pulse (artifact-3), which all are MRI sequence-dependent. In this study, we investigated and quantified the magnitude of these artifacts as a function of the distance from biliary stents, using a sequence-independent approach where possible. METHODS: Eight phantoms were made containing different commercial biliary stents made of nitinol, platinol, stainless steel or polyethylene...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28031841/long-term-outcome-of-nitinol-stenting-to-treat-asphyxia-caused-by-postpneumonectomy-syndrome
#6
Jiro Abe, Toru Hasumi, Ryota Tanaka, Yasuki Saito, Keishi Kanma, Satomi Takahashi
The long-term outcome of nitinol stents introduced into a patient with postpneumonectomy syndrome is described. Postpneumonectomy syndrome is a rare but crucial complication after pneumonectomy characterized by severe dyspnoea and recurrent airway infection caused by compression of the main bronchus. Surgical correction of mediastinal displacement and endobronchial stent placement are two major treatments for this complication; however, endobronchial stenting may be limited to those who are not suitable for operative procedures because long-term management is difficult in terms of controlling airway infections...
January 2017: Respirology Case Reports
https://www.readbyqxmd.com/read/28031646/angioplasty-and-stenting-of-distal-anastomotic-stenosis-of-femoropopliteal-bypass-graft-using-helical-interwoven-nitinol-stents
#7
Yiu Che Chan, Stephen Cheng
Minimally invasive endovascular options of angioplasty and stenting can be used to treat distal anastomotic stenoses in lower limb bypass grafts, but stents near the knee joint may fracture. The nitinol helical interwoven structure of the Supera stents (IDEV Technologies Inc., Houston, TX) has improved flexibility and kink resistance. We report a patient who received salvage angioplasty and Supera stenting of the distal anastomosis of femoropopliteal bypass grafts with good mid-term results. Considering the high radial strength and fracture resistance, these Supera stents may be a good treatment option in salvaging failing bypass grafts...
December 2016: International Journal of Angiology: Official Publication of the International College of Angiology, Inc
https://www.readbyqxmd.com/read/28028692/in-vitro-hydrodynamic-assessment-of-a-new-transcatheter-heart-valve-concept-the-triskele
#8
Benyamin Rahmani, Spyros Tzamtzis, Rose Sheridan, Michael J Mullen, John Yap, Alexander M Seifalian, Gaetano Burriesci
This study presents the in vitro hydrodynamic assessment of the TRISKELE, a new system suitable for transcatheter aortic valve implantation (TAVI), aiming to mitigate the procedural challenges experienced with current technologies. The TRISKELE valve comprises three polymeric leaflet and an adaptive sealing cuff, supported by a novel fully retrievable self-expanding nitinol wire frame. Valve prototypes were manufactured in three sizes of 23, 26, and 29 mm by automated dip-coating of a biostable polymer, and tested in a hydrodynamic bench setup in mock aortic roots of 21, 23, 25, and 27 mm annulus, and compared to two reference valves suitable for equivalent implantation ranges: Edwards SAPIEN XT and Medtronic CoreValve...
December 27, 2016: Journal of Cardiovascular Translational Research
https://www.readbyqxmd.com/read/28024627/fretting-corrosion-behavior-of-nitinol-spinal-rods-in-conjunction-with-titanium-pedicle-screws
#9
Elena Lukina, Mikhail Kollerov, Jay Meswania, Alla Khon, Pavel Panin, Gordon W Blunn
Untypical corrosion damage including erosions combined with the build-up of titanium oxide as a corrosion product on the surface of explanted Nitinol spinal rods in the areas where it was in contact with titanium pedicle screw head is reported. It was suggested that Nitinol rods might have inferior fretting corrosion resistance compared with that made of titanium or CoCr. Fretting corrosion of Nitinol spinal rods with titanium (Ti6Al4V) pedicle screws were tested in-vitro by conducting a series of potentiostatic measurements of the peak-to-peak values of fretting corrosion current under bending in a 10% solution of calf serum in PBS...
March 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28013525/interaction-of-primary-human-trabecular-meshwork-cells-with-metal-alloy-candidates-for-micro-invasive-glaucoma-surgery
#10
Wan Wendy Wang, Kelsey A Watson, S Jeffrey Dixon, Hong Liu, Amin Rizkalla, Cindy Ml Hutnik
BACKGROUND: Microinvasive glaucoma surgery (MIGS) is a relatively new addition to the glaucoma treatment paradigm. Small metallic stents are inserted into the trabecular meshwork in order to increase aqueous humour drainage. MIGS procedures are rapidly being adopted due to a more favourable side effect profile when compared to traditional surgery. Remarkably, this rapid rate of utilization has occurred without any published studies on the effect of metal alloys used in these stents on human trabecular meshwork cells (HTMCs)...
December 25, 2016: Clinical & Experimental Ophthalmology
https://www.readbyqxmd.com/read/28008545/a-tri-leaflet-nitinol-mesh-scaffold-for-engineering-heart-valves
#11
S Hamed Alavi, Marc Soriano Baliarda, Noemi Bonessio, Lorenzo Valdevit, Arash Kheradvar
The epidemiology of valvular heart disease has significantly changed in the past few decades with aging as one of the main contributing factors. The available options for replacement of diseased valves are currently limited to mechanical and bioprosthetic valves, while the tissue engineered ones that are under study are currently far from clinical approval. The main problem with the tissue engineered heart valves is their progressive deterioration that leads to regurgitation and/or leaflet thickening a few months after implantation...
December 22, 2016: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28007631/on-demand-drug-release-and-hyperthermia-therapy-applications-of-thermoresponsive-poly-nipaam-co-hmaam-polyurethane-core-shell-nanofiber-mat-on-non-vascular-nitinol-stents
#12
Aguilar Ludwig Erik, Amin GhavamiNejad, Chan Hee Park, Cheol Sang Kim
A functional cover made up of core-shell nanofibers with a unique combination of thermoresponsive polymeric shell and stretchable polymeric core for non-vascular nitinol stents that uses an alternating magnetic field (AMF) to induce heat in the stent for hyperthermia therapy and simultaneously release 5-fluorouracil and/or paclitaxel was designed. Varied ratios of NIPAAm to HMAAm monomer resulted in different LCST properties was utilized for an on-demand drug release. Biocompatibility test using NIH-3T3 fibroblast cells indicates that the composite with drug content is biocompatible and the in-vitro cancer cytotoxicity test using ESO26 and OE21 cancer cells proved that the material shows cancer cytotoxic properties via combination of dual drug and hyperthermia therapy...
December 20, 2016: Nanomedicine: Nanotechnology, Biology, and Medicine
https://www.readbyqxmd.com/read/28001358/additively-manufactured-and-surface-biofunctionalized-porous-nitinol
#13
Z Gorgin Karaji, M Speirs, S Dadbakhsh, J-P Kruth, H Weinans, A A Zadpoor, S Amin Yavari
Enhanced bone tissue regeneration and improved osseointegration are among the most important goals in design of multifunctional orthopedic biomaterials. In this study, we used additive manufacturing (selective laser melting) to develop multifunctional porous nitinol that combines superelasticity with a rationally designed microarchitecture and biofunctionalized surface. The rational design based on triply periodic minimal surfaces aimed to properly adjust the pore size, increase the surface area (thereby amplifying the effects of surface biofunctionalization), and resemble the curvature characteristics of trabecular bone...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27999810/development-of-a-new-hybrid-biodegradable-drug-eluting-stent-for-the-treatment-of-peripheral-artery-disease
#14
Jung-Hee Lee, Soon-Joong Kim, Se-Il Park, Young-Guk Ko, Donghoon Choi, Myeong-Ki Hong, Yangsoo Jang
This study aimed to develop a new biodegradable stent for peripheral artery disease (PAD) that could provide sufficient radial force to maintain long-term patency and flexibility. All self-expandable hybrid biodegradable stents were designed by using a knitting structure composed of poly-L-lactic acid (PLLA) and nitinol. Four different types of stents were implanted in 20 iliac arteries in 10 mini pigs as follows: a bare-metal stent (BMS) (group 1, n = 5), a drug-free hybrid stent (group 2, n = 5), a 50% (50 : 100, w/w) paclitaxel (PTX)/poly-lactide-co-glycolic acid (PLGA; fast PTX-releasing form) hybrid stent (group 3, n = 5), and a 30% (30 : 100, w/w) PTX/PLGA (slow PTX-releasing form) hybrid stent (group 4, n = 5)...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27998849/comparing-the-vascular-response-in-implantation-of-self-expanding-bare-metal-nitinol-stents-or-paclitaxel-eluting-nitinol-stents-in-superficial-femoral-artery-lesions-a-serial-optical-frequency-domain-imaging-study
#15
Kojiro Miki, Kenichi Fujii, Masahiko Shibuya, Masashi Fukunaga, Takahiro Imanaka, Hiroto Tamaru, Machiko Nishimura, Tetsuo Horimatsu, Yasuhiro Honda, Peter J Fitzgerald, Tohru Masuyama, Masaharu Ishihara
AIMS: This study sought to investigate differences in vascular response between self-expanding bare metal nitinol stents (BMS) and paclitaxel-eluting nitinol stents (PES), in superficial femoral artery (SFA) disease, using optical frequency domain imaging (OFDI). METHODS AND RESULTS: Six months after stent implantation, follow-up quantitative vascular angiography (QVA) and OFDI assessment were scheduled to evaluate vascular response. Volume index (VI) was defined as volume divided by stent length...
December 20, 2016: EuroIntervention
https://www.readbyqxmd.com/read/27989885/transcaval-access-and-closure-for-transcatheter-aortic-valve-replacement-a-prospective-investigation
#16
Adam B Greenbaum, Vasilis C Babaliaros, Marcus Y Chen, Annette M Stine, Toby Rogers, William W O'Neill, Gaetano Paone, Vinod H Thourani, Kamran I Muhammad, Robert A Leonardi, Stephen Ramee, James F Troendle, Robert J Lederman
BACKGROUND: Transcaval access may enable fully percutaneous transcatheter aortic valve replacement (TAVR) without the hazards and discomfort of transthoracic (transapical or transaortic) access. OBJECTIVES: We performed a prospective, independently-adjudicated, multi-center, single-arm Investigational Device Exemption trial of transcaval access for TAVR in patients ineligible for femoral artery access and high or prohibitive risk of complications from transthoracic access...
October 27, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/27987682/porous-magnesium-based-scaffolds-for-tissue-engineering
#17
REVIEW
Mostafa Yazdimamaghani, Mehdi Razavi, Daryoosh Vashaee, Keyvan Moharamzadeh, Aldo R Boccaccini, Lobat Tayebi
Significant amount of research efforts have been dedicated to the development of scaffolds for tissue engineering. Although at present most of the studies are focused on non-load bearing scaffolds, many scaffolds have also been investigated for hard tissue repair. In particular, metallic scaffolds are being studied for hard tissue engineering due to their suitable mechanical properties. Several biocompatible metallic materials such as stainless steels, cobalt alloys, titanium alloys, tantalum, nitinol and magnesium alloys have been commonly employed as implants in orthopedic and dental treatments...
February 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27983574/use-of-micropatterned-thin-film-nitinol-in-carotid-stents-to-augment-embolic-protection
#18
Mahdis Shayan, Brian T Jankowitz, Puneeth Shridhar, Youngjae Chun
Stenting is an alternative to endarterectomy for the treatment of carotid artery stenosis. However, stenting is associated with a higher risk of procedural stroke secondary to distal thromboembolism. Hybrid stents with a micromesh layer have been proposed to address this complication. We developed a micropatterned thin film nitinol (M-TFN) covered stent designed to prevent thromboembolism during carotid intervention. This innovation may obviate the need or work synergistically with embolic protection devices...
December 13, 2016: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/27970365/tct-19-vascular-response-to-paclitaxiel-eluting-nitinol-self-expanding-stent-in-superficial-femoral-artery-lesions-angioscopic-findings-at-2-6-and-12-months-after-implantation
#19
Toshiro Shinke, Amane Kozuki, Osamu Iida, Takayuki Ishihara, Kan Zen, Masashi Fukunaga, Tetsuo Horimatsu, Ken-Ichi Fujii, Junya Shite, Daisuke Terashita, Yoshiro Tsukiyama, Mitsuyoshi Takahara, Masaaki Uematsu, Shinsuke Nanto
No abstract text is available yet for this article.
November 1, 2016: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/27956518/use-of-self-expanding-stents-for-better-intracranial-flow-diverter-wall-apposition
#20
Anna Luisa Kühn, Ajay K Wakhloo, Matthew J Gounis, Peter Kan, Katyucia de Macedo Rodrigues, J Diego Lozano, Miklos G Marosfoi, Mary Perras, Christopher Brooks, Mary C Howk, David E Rex, Francesco Massari, Ajit S Puri
BACKGROUND: Flow diverter (FD) malapposition is associated with stroke-related complications. We document the use of self-expanding nitinol stents to remove/reduce the ledge of a FD deployed for aneurysm treatment. METHODS: We identified five patients who were treated with the Pipeline embolization device (PED) in conjunction with a Neuroform EZ stent for inadequate wall apposition of the ends of the FD at our institution between May 2014 and July 2015. Among other parameters, angiographic results, cone-beam computed tomography assessment of wall apposition and patient clinical outcome were evaluated...
December 12, 2016: Interventional Neuroradiology
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