Medical powder

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Title: Medical powder
United States Patent: 6,162,469
Inventors: Atarashi; Takafumi (Tokyo, JP); Nakatsuka; Katsuto (Miyagi, JP)
Assignee: Nittetsu Mining Co., Ltd. (Tokyo, JP); Katsuta Nakatsuka (Miyagi, JP)
Appl. No.: 202052
Filed: March 29, 1999
PCT Filed: June 6, 1997
PCT NO: PCT/JP97/01938
371 Date: March 29, 1999
102(e) Date: March 29, 1999
PCT PUB.NO.: WO97/47322
PCT PUB. Date: December 18, 1997
Foreign Application Priority Data: Jun 10, 1996[JP] (8-147416)
Abstract
A safe medical powder with excellent performances which is a magnetosensitive powder for diagnosis, therapy, or drug delivery and which, even when placed in the body for a prolonged period, neither suffers a decrease in magnetic sensitivity nor releases ions, etc. The medical powder comprises a base particle of a ferromagnetic metal having thereon a coating layer, wherein at least the outside of the coating layer comprises a bioinert substance. Preferably, the coating layer comprising a bioinert substance comprises a layer comprises a hydrolysate of an alkoxide compound.