Please select the most similar patent number from A, B, C and D. Which number is?
The present application relates to a medical device. The medical device comprises a matrix and a first coating coated on the matrix. The matrix contains a metal element X having a content of ≥ 5 wt%; the first coating is at least one of an elemental metal layer of the metal element X, an alloy layer of the metal element X, and a metal-ceramic layer of the metal element X; and the first coating does not contain nickel and cobalt. The medical device has good use safety, reliability, and biocompatibility, so that a product can meet a use requirement of large plastic deformation, and has good reliability during use. The medical device can particularly meet requirements of products with large plastic deformation during use, such as medical implant devices.
A: The present application relates to a Prussian blue analogue having a core-shell structure, comprising a core and a cladding layer covering the core, wherein the chemical formula of the core is the following formula 1, Na x P[R(CN) 6 ] δ ·zH 2 O Formula 1, wherein P and R are each independently selected from at least one of transition metal elements, and 0&lt;x≤2, 0&lt;δ≤1 and 0≤z≤10, the chemical formula of the cladding layer is the following formula 2, A y L[M(CN) 6 ] α ·wH 2 O Formula 2, wherein A is an alkali metal element or an alkali-earth metal element other than sodium, L and M are each independently selected from at least one of transition metal elements, 0&lt;y≤2, 0&lt;α≤1 and 0≤w≤10. The Prussian blue analogue of the present application has a good storage stability, thereby greatly reducing the manufacturing cost of the subsequent cell level. The present application further relates to a method for preparing a Prussian blue analogue having a core-shell structure, a sodium-ion secondary battery comprising the Prussian blue analogue, a battery module, a battery pack, and an electrical device.
B: Disclosed is a medical instrument coating, being coated on the surface of a nickel-titanium alloy component of a medical instrument. The medical instrument coating comprises an elementary copper phase, an amorphous titanium-containing substance and a transition layer comprising a copper-nickel intermetallic phase. Also mentioned is a preparation method for the medical instrument coating. A medical instrument comprising a copper-titanium coating has good blood compatibility, and simultaneously can inhibit the endothelialization of the medical instrument surface, improving the recovery rate of the medical instrument and prolonging the recovery time window; the copper-titanium coating belongs to the group of metal composite coatings, has a certain toughness and ductility, and avoids the large-amplitude deformation process of the medical instrument damaging the coating; and the mechanical property and the coating quality of the medical instrument comprising a fine nickel-titanium alloy component are guaranteed by means of the a method for preparing the coating.
C: The examples of the present application provide a lithium metal strip, a lithium pre-replenishing electrode plate, a lithium pre-replenishing method, a secondary battery, a preparation method for the secondary battery and a device. The lithium metal strip provided in the present application comprises a lithium substrate and a metal element doped in the substrate. The metal element comprises at least two of magnesium, boron, aluminium, silicon, indium, zinc, silver, calcium, manganese and sodium. The strength σ, the width w and the thickness h of the lithium metal strip satisfy σ 2  - (w/105h) 2  &gt; 0. In the present application, the strength of the lithium metal strip is adjusted by adding a metal element; at the same time, the adjusted strength of the lithium metal strip matches with the width and thickness thereof, thereby ensuring that during the process of rolling the lithium metal strip into a reasonable degree of thinness, the phenomenon of edge-cracking of the lithium strip is avoided, thus saving lithium metal resources and production costs, and also enabling the electrode plate to obtain a uniform lithium pre-replenishing effect.
D: Disclosed are a highly plastic zirconium-based bulk amorphous alloy with no beryllium or nickel, and a method for preparing same. The alloy has the components in atom percent as follows: Zr: 38-50％, Hf: 2-15％, Cu: 20-30％, Fe: 5-10％, Al: 10-15％, Co: 0-5％, Ag: 0-5％, and Nb: 0-5％; and the alloy is prepared by arc melting/copper mold suction casting. The amorphous alloy contains no metal elements such as Be and Ni, thus improving the biocompatibility of the Zr-based alloy; the alloy has a high amorphous forming ability, which allows a Zr-based bulk amorphous alloy with a critical size of no less than 5mm to be prepared by a copper mold suction casting method; the alloy has a high hardness, the Vickers hardness thereof always being more than 540Hv; the alloy has a plastic deformation ability of more than 3%; and the alloy has a wide super-cooled liquid region range, the maximum being 92K. The alloy has a wide application prospect in the field of complex and precise medical devices and parts, artificial joints and bones and other biomedical materials.
Answer: B