Chemistry: electrical and wave energy – Processes and products – Coating – forming or etching by sputtering
Patent
1992-03-27
1997-11-11
Nguyen, Nam
Chemistry: electrical and wave energy
Processes and products
Coating, forming or etching by sputtering
20419214, 216 83, 427 21, 427 228, 427304, 252 791, C23C 1434, A01N 102
Patent
active
056859619
ABSTRACT:
Catheters and other medical devices include plural layers of metals applied to the outer surfaces, which tend to close minuscule cracks through which corrosion may attack the underlying support. In some avatars, the initial layer of material is preferably silver, applied following specific preparation steps. In other embodiments, succeeding layers of metal completely cover the initial layer, and are also of silver. The succeeding layers are deposited after deposition of the prior layer, and tend to reduce the incidence of microscopic pores or cracks and are less prone to delamination. The succeeding layers are preferably of mutually different metals between layers. In a particular avatar, in which the exposed metals are oligodynamic silver and more noble platinum, the exposed silver layer lies over a portion of the platinum layer, to thereby prevent corrosion of the silver layer from disconnecting portions of the silver layer. Fabrication methods include deposition of successive layers by means of sputtering in a longitudinal array of cylindrical magnetron sections, in which each section applies one layer of the coating over the coating applied by the preceding section. The magnetron sections may be energized and deenergized in a temporal pattern associated with the progress of the workpiece material through the array, to thereby cover or expose particular longitudinal layers. In some embodiments, a first layer of electrically conductive material is deposited by electroless methods particularly in the lumen, following which additional layers may be applied by conventional electrolytic deposition. An electroless method according to the invention includes preparation steps which may include ultrasonically cleaning the surface with a solution of isopropyl alcohol, then drying the surface with a stream of dry gas, and etching the surface with a solution of sodium naphthalene in diethylene glycol dimethyl ether.
REFERENCES:
patent: 3627663 (1971-12-01), Davidse et al.
patent: 3884793 (1975-05-01), Penfold et al.
patent: 4253463 (1981-03-01), Kim
patent: 4376025 (1983-03-01), Zeag
patent: 4466874 (1984-08-01), Belkes, Jr. et al.
patent: 4495907 (1985-01-01), Kamo
patent: 4886505 (1989-12-01), Haynes et al.
patent: 4911811 (1990-03-01), Mullaney, Jr.
patent: 4930863 (1990-06-01), Croitoriu et al.
patent: 4960753 (1990-10-01), Collins et al.
patent: 5178743 (1993-01-01), Kumar
patent: 5320908 (1994-06-01), Sondervall et al.
Article "Meeting Report: Recent Conference Focuses on Toxicity and Environmetn", by Ellis, pp. 138-141 of the Jan. 92 issue of Medical Device and Diagnostic Industry.
"Effect of deposition parameters on properties of filmsdeposited on fibers by hollow cathode magnetron sputtering", by Ihsan et al., pp. 1304-1312 of J. Vac. Sci. Technol. A8(3), May, Jun. 1990, pub by American Vacuum Society.
Pp. 169-172 of text "Plating of Plastics-recent Developments", by F.A. Domino, pub. by Noyes Data Corp, Park Ridge, NJ, also pp.104-107.
"Metalizing Non-conductors" by Chas. Davidoff, at pp. 428-434 of the 46th annual Metal Finishing Guidebook Directory, pub. CA 1978 by Metals and Plastics Pubs. Inc. at One University Plaza, Hackensack, NJ 07601.
Article "Practical Formulations for Plating on ABS plastics" by John et al., pp. 51-54 of the Mar., 1986 issue of Metal Finishing Magazine, pub. by Metals and Plastics Publications, supra.
"Silver Alloy Coated Catheters Reduce Catheter-associated Bacteriuria", by Liedberg et al., pub. at pp. 379-381 of British Journal of Urology, vol. 65.
Official Gazette, Dec. 3, 1991, p. 111, US 5,069,227.
"Refinements in the Coating of Urethral Catheters Reduces the Incidence of Catheter-Associated Bacteriuria", published at pp. 236-240 of Eur Urol 1990, vol. 17.
Beard Richard Burnham
Boxman Raymond Leon
DeLaurentis Mark
Pourrezaei Kambiz
Shvets Irina
Meise William H.
Nguyen Nam
P & D Medical Coatings, Inc.
LandOfFree
Method for fabrication of metallized medical devices does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for fabrication of metallized medical devices, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for fabrication of metallized medical devices will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1225841