Shape regulation of high-index facet nanoparticles by dealloying
Tetrahexahedral particles (~10 to ~500 nanometers) composed of platinum (Pt), palladium, rhodium, nickel, and cobalt, as well as a library of bimetallic compositions, were synthesized on silicon wafers and on catalytic supports by a ligand-free, solid-state reaction that used trace elements [antimony (Sb), bismuth (Bi), lead, or tellurium] to stabilize high-index facets. Both simulation and experiment confirmed that this method stabilized the {210} planes. A study of the PtSb system showed that the tetrahexahedron shape resulted from the evaporative removal of Sb from the initial alloy—a shape-regulating process fund...
Source: ScienceNOW - September 11, 2019 Category: Science Authors: Huang, L., Liu, M., Lin, H., Xu, Y., Wu, J., Dravid, V. P., Wolverton, C., Mirkin, C. A. Tags: Materials Science reports Source Type: news
Using Advanced Materials to Make Better Implants is Just the Starting Point for MiRus
“We're always trying to solve meaningful problems,†said Jay S. Yadav, MD, founder and CEO of MiRus, in an interview with MD+DI. Yadav formerly founded CardioMEMS, which created the first wireless cardiac implant, among other companies, and he has always been interested in creating better materials for all types of devices. MiRus, his latest venture, is focused on the orthopedic world, at least for now.
“Several years ago we were searching for better alloys for cardiovascular implants and were fortunate to collaborate with metallurgists that had previously w...
Source: MDDI - August 27, 2019 Category: Medical Devices Authors: Susan Shepard Tags: Implants Source Type: news
Effects of precementation on minimizing residual cement around the marginal area of dental implants
ConclusionsThese in vitro results suggest that precementation with a precisely manufactured precementation abutment minimized the residual cement around implant abutments, and 50 μm could be a preferable precementation space. (Source: Dental Technology Blog)
Source: Dental Technology Blog - August 8, 2019 Category: Dentistry Source Type: news
Contact allergies to dental materials
This study included 86 subjects (83.7% women and 16.3% men) with oral symptoms of a contact allergy. The average age was 63 years (24–86). The most common allergies were to metals, of which nickel and cobalt were th e most common allergens. Furthermore, many allergies were indicated to ingredients of cosmetics and composites. Allergies to components in methacrylate-containing denture resins came in at rank 5. 52.4% of the patients showed mucosal changes. Contact stomatitis (54.5%) and an oral lichenoid les ion (20.5%) were most frequently diagnosed. 86% of the patients reported subjective complaints. Pain and burning sen...
Source: Dental Technology Blog - July 27, 2019 Category: Dentistry Source Type: news
Molecular electrocatalysts can mediate fast, selective CO2 reduction in a flow cell
Practical electrochemical carbon dioxide (CO2) conversion requires a catalyst capable of mediating the efficient formation of a single product with high selectivity at high current densities. Solid-state electrocatalysts achieve the CO2 reduction reaction (CO2RR) at current densities ≥ 150 milliamperes per square centimeter (mA/cm2), but maintaining high selectivities at high current densities and efficiencies remains a challenge. Molecular CO2RR catalysts can be designed to achieve high selectivities and low overpotentials but only at current densities irrelevant to commercial operation. We show here that cobalt phthal...
Source: ScienceNOW - July 24, 2019 Category: Science Authors: Ren, S., Joulie, D., Salvatore, D., Torbensen, K., Wang, M., Robert, M., Berlinguette, C. P. Tags: Chemistry reports Source Type: news
Kayaker finds rare Roman glass and pottery off Kent coast
Archaeological discovery could have come from possible shipwreck near RamsgateObjects from a possible Roman shipwreck have been found off the coast of Kent in one of the most unusual archaeological finds in living memory.The chance discoveries were made by a kayaker in the sea off Ramsgate. The tide was low enough and the water clear enough for him to reach down and pull out beautiful cobalt blue glassware and high-status Roman pottery, called Samian ware.Continue reading... (Source: Guardian Unlimited Science)
Source: Guardian Unlimited Science - July 17, 2019 Category: Science Authors: Mark Brown Arts correspondent Tags: Roman Britain UK news Archaeology Science Art and design Culture Source Type: news
The Pros and Cons of Standardized Testing
Independent organizations and FDA establish standardized test methods for materials and devices. The independent organizations (e.g., AAMI, ASTM, ISO, USP, etc.) create voluntary consensus standards. These may then become recognized by FDA, with some 1300 standards now found in the Recognized Consensus Standards database. For some of these standards, FDA includes a Rationale for Recognition statement with the curious language that the standard “is recognized on its scientific and technical merit and/or because it supports existing regulatory policies.â€
Recognized standards may in turn be...
Source: MDDI - July 6, 2019 Category: Medical Devices Authors: William A. Hyman Tags: Testing Source Type: news
How Much Cobalt Is in Your Metal Alloy?
The European Union is moving forward on its proposal to set risk management and labeling requirements relevant to the amount of cobalt in medical devices. The rule would be triggered at a limit of 0.1% by weight. This action is predicated on elevating the carcinogenic risk level of cobalt into a category known as 1b-Substances presumed to have carcinogenic potential for humans. At a minimum, compliance with these regulations will require knowledge of the amount of cobalt present in the metal alloys from which devices are made. For alloys that intentionally contain cobalt, this information should be readily available from t...
Source: MDDI - May 24, 2019 Category: Medical Devices Authors: William A. Hyman Tags: Materials Source Type: news
Transforming waste heat into clean energy
(University of Texas at Austin, Texas Advanced Computing Center) Through a mechanism known as the Spin Hall effect, it has been shown that a voltage can be generated by harnessing differences in spin populations on a metal contact attached to a ferromagnetic material.Researchers from The University of Texas Permian Basin used supercomputers at the Texas Advanced Computing Center to identify various forms of cobalt oxide combined with nickel and zinc that show promise for thermoelectric generation by taking advance of the Spin Hall effect. (Source: EurekAlert! - Biology)
Source: EurekAlert! - Biology - May 1, 2019 Category: Biology Source Type: news
Medical News Today: A special 'stained glass' can help kill hospital 'superbugs'
Researchers have developed a new type of bioactive glass, stained with cobalt, which allows it to kill many dangerous strands of bacteria and fungi. (Source: Health News from Medical News Today)
Source: Health News from Medical News Today - April 12, 2019 Category: Consumer Health News Tags: Infectious Diseases / Bacteria / Viruses Source Type: news
FDA clears first molybdenum rhenium pedicle screw
The FDA today cleared Mirus‘s Europea pedicle screw system, which is composed of its MoRe proprietary molybdenum rhenium superalloy, making it the first such device approved with the new class of implant material.
The Atlanta-based medical device company said that the MoRe proprietary alloy is intended to provide improved strength, ductility, durability and biological safety.
“Spine deformity surgery in adults remains plagued by the poor performance of current implants with rod failure occurring in 18%-20% of patients. The MoRe alloy shows great promise in improving the durability of adult spine deformity const...
Source: Mass Device - March 27, 2019 Category: Medical Devices Authors: Fink Densford Tags: Food & Drug Administration (FDA) Orthopedics Regulatory/Compliance mirus Source Type: news
Bruce Power, Nordion get their cobalt-60
Bruce Power has begun manufacturing medical grade cobalt-60 for processing...Read more on AuntMinnie.comRelated Reading:
Nordion extends Chinese cobalt-60 supply agreement
BWXT completes acquisition of Nordion business
Nordion, Bruce Power collaborate to supply cobalt-60
Nordion nets funding for isotope venture
Canada renews Nordion's nuclear processing license (Source: AuntMinnie.com Headlines)
Source: AuntMinnie.com Headlines - March 27, 2019 Category: Radiology Source Type: news
Nordion extends Chinese cobalt-60 supply agreement
Sotera Health's Nordion medical isotope business has extended an existing cobalt-60...Read more on AuntMinnie.comRelated Reading:
BWXT completes acquisition of Nordion business
Sotera Health to sell Nordion business
Nordion, Bruce Power collaborate to supply cobalt-60
Nordion nets funding for isotope venture
Canada renews Nordion's nuclear processing license (Source: AuntMinnie.com Headlines)
Source: AuntMinnie.com Headlines - March 26, 2019 Category: Radiology Source Type: news
Medtronic Keeps DES Market Hot with New Indication
Rumblings in the Drug-Eluting Stent market continued this week after Medtronic said it has obtained FDA approval for an additional indication for its Resolute DES platform and the Resolute Integrity.
The Dublin-based company’s new indication is for the treatment of patients with coronary disease who have de novo chronic total occlusion (CTO), a complex vessel condition involving complete blockage of a coronary artery. CTO is considered more difficult to treat with percutaneous coronary intervention (PCI) due to a greater risk of complications.
The expanded CTO indication was supported by data from the PER...
Source: MDDI - February 26, 2019 Category: Medical Devices Authors: Omar Ford Tags: Cardiovascular Business Source Type: news
Globus Medical lands Anthem coverage win for Secure-C spinal implant
Globus Medical (NYSE:GMED) last week said it won a coverage decision for its Secure-C cervical spine implant from health insurance giant Anthem (NYSE:ANTM).
Audubon, Pa.-based Globus said the decision means the device is covered by the major third-party payers in all 50 states. Anthem has more than 73 million lives under its coverage umbrella, according to Globus. The Secure-C device won pre-market approval from the FDA in 2012 and is is designed to restore normal movement to the neck in patients with disc problems that produce neck and arm pain. It consists of 2 cobalt-chrome endplates and a central polyethylene core...
Source: Mass Device - January 28, 2019 Category: Medical Devices Authors: Brad Perriello Tags: Orthopedics Spinal Wall Street Beat Anthem Inc. Globus Medical Reimbursement Source Type: news
