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Corrosion Resistant Magnetic Products

A magnetic product, corrosion-resistant technology, applied in the direction of magnetic objects, magnetic materials, permanent magnet manufacturing, etc., can solve problems such as protective coating cracking

Active Publication Date: 2020-03-06
MEDTRONIC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this protectively coated NdFeB magnet was immersed in a saline solution, in some cases the protective coating cracked within 24 hours of initial exposure

Method used

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  • Corrosion Resistant Magnetic Products
  • Corrosion Resistant Magnetic Products
  • Corrosion Resistant Magnetic Products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] With 32 million Gauss Oersted BH 最大 value and shape like Figure 5 The NdFeB ring magnet of magnet 500 shown was coated with two 17 μm thick p-xylene HT (available from Specialty Coating Systems) conformal coatings. Before the conformal coating is applied, the magnets are clamped in different fixed positions to ensure a continuous conformal coating is applied. The magnets thus coated are covered with polyethersulfone using a two-step injection molding process to produce e.g. Image 6 Encapsulated, barrier-coated magnets shown. The magnets were immersed in 87°C saline solution for 28 days and then removed for evaluation. The magnet exhibited no visible corrosion and retained all of its pre-immersion magnetic strength. Inductively coupled plasma (ICP) mass spectrophotometric analysis of the saline solution after immersion did not reveal detectable magnetic elements compared to a saline control prepared without immersion of the magnet.

Embodiment 2

[0102] A barrier coated magnet as described in Example 1 can be used as a magnetic rotor assembly to control the flow of CSF fluid in a diverter valve such as that shown in the aforementioned Bertrand et al. application. In an initial field trial, a shunt valve and magnet rotor assembly containing the disclosed barrier-coated magnet was successfully surgically implanted in 13 patients and confirmed operable. The rotor assembly is expected to be resistant to corrosion by bodily fluids, as well as unintentional changes in rotor (ie, pressure) setting, demagnetization, and remagnetization when exposed to a 3 Tesla MRI magnetic field.

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Abstract

Magnetic articles having a corrosion-resistant barrier consisting of a poly(tetrafluoro-p-xylene) conformal coating, or a melting point of at least about 430°C and a moisture vapor permeability at 90% RH and 37°C of less than about A 0.5 g-mm / m2 / day parylene conformal coating was formed, which was covered by a thermoplastic polysulfone overlay.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Application Serial No. 14 / 603,027, entitled "Glass Corrosion Resistant Magnetic Articles," filed January 22, 2015, the contents of which are incorporated herein by reference. [0003] field of invention [0004] This invention relates to coated magnetic articles. [0005] technical background [0006] US Patent Application Publication No. US 2013 / 0345646A1 (Bertrand et al.) describes an implantable physiological shunt system that employs magnetic coupling between an external adjustment tool and an internal magnetic rotor assembly. The shunt system may include a locking feature to avoid inadvertent setting changes when the shunt is exposed to a strong external magnetic field. This feature is particularly important when shunts used to control cerebrospinal fluid (CSF) flow in the ventricles of patients with hydrocephalus are exposed to external magnetic fields during magnetic reso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F7/02C09D165/04C09D5/08
CPCC09D5/08C09D165/04H01F7/021H01F41/026A61L31/022A61L31/14A61L31/10A61L2420/02A61L2420/08C08L65/04C08L81/06H01F1/057H01F27/23A61L31/028A61M27/002A61M2207/00H01F1/055H01F7/02
Inventor C·M·A·梁W·J·贝特朗D·P·埃默里L·C·斯贝克曼T·J·希尔洛柯克
Owner MEDTRONIC INC