Stent-valves (e.g., single-stent-valves and double-stent-valves), associated methods and systems for their delivery via minimally-invasive surgery, and guide-wire compatible closure devices for sealing access orifices are provided.

Stent-valves for valve replacement and associated methods and systems for surgery

New cyclic quaternary ammonium salts, composed of N-alkyl-(alkyl ether)-N-methylpyrrolidinium, -oxazolidinium, -piperidinium, or -morpholinium cations (alkyl=nC 4 H 9 , alkyl ether=CH 3 OCH 2 , CH 3 OCH 2 CH 2 ) and a perfluoroalkyltrifluoroborate anion ([R F BF 3 ] - , R F =CF 3 , C 2 F 5 , nC 3 F 7 , nC 4 F 9 ), were synthesized and characterized. Most of these salts are liquids at room temperature. The key properties of these salts-phase transitions, thermal stability, density, viscosity, conductivity, and electrochemical windows-were measured and compared to those of their corresponding [BF 4 ] - and [(CF 3 SO 2 ) 2 N] - salts. The structural effect on all the above properties was intensively studied in terms of the identity of the cation and anion, variation of the side chain in the cation (i.e., alkyl versus alkyl ether), and change in the length of the perfluoroalkyl group (R F ) in the [R F BF 3 ] - ion. The reduction of Li + ions and reoxidation of Li metal took place in pure N-butyl-N-methyl-pyrrolidinium pentafluoroethyltrifluor-oborate as the supporting electrolyte. Such comprehensive studies enhance the knowledge necessary to design and optimize ionic liquids for many applications, including electrolytes. Some of these new salts show desirable properties, including low melting points, high thermal stabilities, low viscosities, high conductivities, and wide electrochemical windows, and may thus be potential candidates for use as electrolytes in high-energy storage devices. In addition, many salts are ionic plastic crystals.

Cyclic quaternary ammonium ionic liquids with perfluoroalkyltrifluoroborates: synthesis, characterization, and properties.

Metal catalysts for the vinyl/addition polymerization of norbornene

A high capacity lithium secondary battery with excellent safety is provided by suppressing expansion of a negative electrode active material during charge and increasing the content of a heat-resistant resin in a separator relative to conventional one. The lithium secondary battery includes: a negative electrode active material that comprises compound particles containing at least one metal element selected from the group consisting of Si, Sn, Al, and Zn; and a separator that has a first porous layer comprising polyolefin and a second porous layer comprising a heat-resistant resin. The separator contains 10 to 60 parts by weight of the second porous layer per 100 parts by weight of the first porous layer.

Lithium Secondary Battery

The present invention relates to a stent for the positioning and anchoring of a valvular prosthesis in an implantation site in the heart of a patient. Specifically, the present invention relates to an expandable stent for an endoprosthesis used in the treatment of a narrowing of a cardiac valve and/or a cardiac valve insufficiency. So as to ensure that no longitudinal displacement of a valvular prosthesis fastened to a stent will occur relative the stent in the implanted state of the stent, even given the peristaltic motion of the heart, the stent according to the invention comprises at least one fastening portion via which the valvular prosthesis is connectable to the stent. The stent further comprises positioning arches and retaining arches, whereby at least one positioning arch is connected to at least one retaining arch.

Stent for the positioning and anchoring of a valvular prosthesis in an implantation site in the heart of a patient

https://koasas.kaist.ac.kr/bitstream/10203/3877/1/000221124300049.pdf

Ionic liquids based on N-alkyl-N-methylmorpholinium salts as potential electrolytes.

Nickel(II) and palladium(II) complexes of the general type [MCl 2 {Ph 2 P(CH 2 ) n PPh 2 }] with n = 2, 3 and M = Ni (2, 3), Pd (4, 5) have been utilized as catalysts for the polymerization reaction of norbornene. It was found that the use of B(C 6 F 5 ) 3 /triethylaluminium (TEA) in comparison to methylaluminoxane as an activator towards complexes 2, 3 and 5 gave comparable polymerization activities, and the system 4/B(C 6 F 5 ) 3 /TEA even led to an extremely high polymerization activity of 10 7 g polymer /mol metal .h.

Borane activators for late-transition metal catalysts in norbornene polymerization

A non-aqueous electrolyte solution includes an electrolyte solution including an amide compound and a lithium salt, and a dinitrile compound substituted by a hetero atom at a main chain, and a lithium secondary battery includes the non-aqueous electrolyte solution. By using the non-aqueous electrolyte solution, a lithium secondary battery having an improved swelling phenomenon and an increased charging/discharging performance may be provided.

Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

An electrolyte includes an eutectic mixture composed of (a) a hetero cyclic compound having a predetermined chemistry figure, and (b) an ionizable lithium salt. An electrochemical device having the electrolyte. The eutectic mixture included in the electrolyte exhibits inherent characteristics of an eutectic mixture such as excellent thermal stability and excellent chemical stability, thereby improving the problems such as evaporation, ignition and side reaction of an electrolyte caused by the usage of existing organic solvents.

Electrolyte having eutectic mixture and electrochemical device containing the same

Disclosed are: an amide compound having a specific structure in which an amine group has been substituted with an alkoxy group; and an electrolyte containing an ionisable lithium salt and electrochemical elements comprising the same. The electrolyte of the present invention has outstanding heat-stability and chemical stability and a wide electrochemical window. Further, the electrolyte exhibits adequately low viscosity and high ionic conductivity, and can hence be advantageously employed as an electrolyte for electrochemical elements employing diverse cathode materials.

Jae-Seung Oh

Papers

Ionic liquids based on N-alkyl-N-methylmorpholinium salts as potential electrolytes.

Borane activators for late-transition metal catalysts in norbornene polymerization

Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery including the same

Electrolyte having eutectic mixture and electrochemical device containing the same

Electrolyte comprising an amide compound, and an electrochemical element comprising the same