JPH02221402A - Pacemaker-protecting wear - Google Patents

Abstract

PURPOSE:To provide the subject protecting wear having an excellent property for shielding magnetic and electromagnetic waves by cutting a woven fabric comprising amorphous alloy fibers into a wear-like shape, covering at least one surface of the cut woven fabric with a woven or knit fabric comprising synthetic fibers, etc., a leather or a resin sheet and subsequently sewing the covered fabric. CONSTITUTION:A woven fabric prepared by wearing amorphous alloy foil wires, etc., as warps and/or wefts is cut into a wear-like shape and at least one surface of the cut fabric is covered with a woven or knit fabric comprising synthetic fibers or natural fibers, a leather or a resin sheet, followed by wearing into a protecting wear. An auxiliary cloth produced of amorphous alloy fibers is preferably adhered to the breast portion (the surface A) of the wear.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a pacemaker device for use in heart disease patients.
This invention relates to pacemaker protective clothing for preventing functional impairment caused by magnetic and electromagnetic waves entering from the outside.

[Prior Art] Conventionally, no protective clothing has been found that protects pacemakers from magnetic and electromagnetic interference, and this is due to the following reasons. In other words, the material that shields pacemakers from magnetism, which is most susceptible to damage, is permalloy (compared to conventional metal materials).
Permalloy requires annealing to increase its magnetic permeability. However, if this metal is subjected to processing such as bending after annealing, the magnetic permeability may drop to the properties before annealing, so if stress such as deformation is applied to make it into a woven or knitted fabric, the magnetic shielding effect will be reduced. It cannot be used as the desired material. In addition, silicon steel plates have low magnetic permeability, so even if woven or knitted fabrics are made from this metal in the form of foil wires, the magnetic shielding effect is low, and the thick plates lack flexibility, making them suitable for use as protective clothing for pacemakers. is inappropriate.

For the reasons mentioned above, the reality is that clothing that protects pacemakers has not yet been developed.

[Problems to be Solved by the Invention] The purpose of the present invention is to provide a magnetic and electromagnetic wave shield that allows pacemaker patients to maintain normal function of their pacemaker even when they are exposed to high direct current or alternating current magnetic and electromagnetic waves. Our goal is to provide superior pacemaker protective clothing.

[Means for Solving the Problems] The pacemaker protective clothing of the present invention for achieving the above object is produced by cutting a fabric using amorphous alloy fibers into a garment shape, and fabricating a woven or knitted fabric made of synthetic fibers or natural fibers on at least one side. Alternatively, it is characterized by being made by covering and sewing leather or resin sheets.

Further, in the present invention, the amorphous alloy fiber can be filled inside a garment cut into a predetermined shape.

Furthermore, in the present invention, the chemical composition of the above amorphous alloy is Fe a X b Me or CodFe,
, Y, M, and l. Here × is V, C
r, Mo, Nb, W, Ta.

One or more types of Mn, Ni, Co, M is mouth, C,
One or more types of P and Si, a: 70 to 90 (atomic %), b: O to 15, c: IO to ]5, provided that a+b
+c-100. Also, Y is V, Cr, Mo, Nb
, W, Ta, Mn, Ni or more, M is B,
One or more of C, P, and Si, d: 60 to 80 (
atomic%), e: 1-8, f: 0-+5.
g: 10 to 35, but d+e+f+g-100.

Further, the fibers of the amorphous alloy mentioned above can be used as they are, or they can be plated with one or more of the following: u, Sn, Ni, Zn, Ag, and Pb.

[Function] Since the protective clothing of the present invention is formed into a clothing-like shape using amorphous alloy fibers, or is filled inside a clothing with a predetermined shape, it effectively prevents the magnetism that causes pacemaker malfunctions. It becomes possible to shield the

[Details of the Invention] Here, the amorphous alloy fiber refers to a fiber that is made of an amorphous alloy, has a shape smaller in width than length, and can be made into a rope knitted fabric. Further, in consideration of flexibility as a garment, the specific width of the fibers is preferably 0.01+un to 20 mm. A fiber whose width is wider than several ates is sometimes called a foil wire, but in the present invention, it is unified by fiber.

A pacemaker is an electronic device that is implanted in the chest of a heart disease patient and sends out a pulse signal that matches the patient's pulse to maintain a normal pulse. The pulse transmitting device built into such a pacemaker operates according to a program, and this program can be changed by external magnetism. Therefore, if high magnetism acts on the pacemaker, it is possible that the recording of the program will change, resulting in malfunction, which may have an adverse effect on the patient.

The magnetic field that causes such malfunction is called an interference magnetic field, and is usually 60 Gauss or higher.

The present inventors have discovered that pacemaker protective clothing can be made from a woven or knitted amorphous alloy foil wire to shield magnetism from various magnetic sources and reduce the magnetic field below the interfering magnetic field.

Amorphous alloy foil wire is a material with high magnetic permeability and low coercive force, so it has excellent magnetic shielding properties and is not magnetized even when subjected to magnetism. Furthermore, this metal foil can be used to produce a thin foil wire of about 20 μm, and by weaving a fabric using the amorphous alloy foil wire, flexible protective clothing can be made.

As shown in Example 1 below, the pacemaker protective clothing of the present invention has a magnetic shielding effect on permanent magnets, even when the samarium cobalt magnet shown in Table 1, which has a high magnetism of 2200 Gauss, is 7 mm from the magnet!
The distance was 77 gauss, but protective clothing could shield it to 0.8 gauss.

Table 2 shows the experimental results of the magnetic shielding effect on pacemakers using a human chest model. The arrangement of the electromagnet and human chest model in the experiment is shown in Figure 1. In FIG. 1, 1 is a human body model, 2 is a pacemaker implantation position (P), 3 is a rotating table on which the human body model 1 is placed, 4
is an electromagnet.

5 is the iron core, 6 is the position of the tip of the magnetic core facing the human model (M)
It is.

The electromagnet used in this experiment had DC 8V, +4A, and DC magnetism at the tip of the magnetic core was 2400 Gauss. The following experimental results were obtained using this magnetic generator.

There are several manufacturers of pacemakers, and the interference magnetic field differs depending on the use of each company. For example, those made by MEDTRONIC have a normal rate of 69PPM and a magnet rate of 99PPM.
However, when actually measured, interference occurs from 60.5 Gauss.

When wearing the protective clothing of the present invention, the distance is 155 m from the magnetic center.
m <7) Close range 11i terror 0.5 Gaussian magnetism,
Since it was shielded to 47.0 Gauss, the pacemaker operated normally without interference from the magnetic field. In addition, the pacemaker protective clothing showed a shielding effect of 35 dB in the electromagnetic wave shielding effect in the N10N10O0 band.

The chemical composition of the amorphous alloy used in the present invention is F
Displayed as e, XbMc or Go, Fe, Y, M. Here, X is V, Cr, Mo, Nb, W, Ta, Mn
, Ni, Co, M is B, C, P, S
One or more types of i, a: 70 to 90 (atomic%)
, b: 0-15. c: 10-35, but a+b
+c-100. Moreover, Y is V, (:r, Mo.

One or more of Nb, W, Ta, Mn, and Ni; M is B, C, and P;

One or more types of Si, d: 60 to 80 (atomic %
).

e: 1-g, f: 0-15. g:IG~35
, where d+6+f+g-100.

Fe, XJc-based alloys are alloys with high saturation magnetic flux density,
Suitable for shielding relatively high magnetic fields. on the other hand.

CodFe, YfM, and alloys have high magnetic permeability and are suitable for shielding relatively low magnetic fields. Moreover, by combining the two, the shielding effect can be enhanced more than each alone. In that case, FeaXb on the high magnetic field side
A Mc-based alloy is used.

The chemical composition of the amorphous alloy foil wire used in the present invention is defined from the viewpoints of magnetic properties, amorphous formation ability, corrosion resistance, plating properties, and the like.

Specifically, the Fe, XbMc alloy needs to contain at least 70 (atomic %) Fe as a main component in order to obtain a high saturation magnetic flux density. However, if Fe exceeds 90, the ability to form an amorphous layer decreases significantly, so the upper limit is set at 90. The X component is added as necessary to improve soft magnetic properties and corrosion resistance. However, if it exceeds 15, the saturation magnetic flux density may be significantly lowered depending on the element, so the upper limit was set at 15. Since M (metalloid) is an element necessary for amorphous formation, it is necessary to add 1O to 35 (atomic %), so the above range was defined.

Furthermore, in Go, Fe, and YyM, the contents of CO and Fe should be determined by taking into account the X component and the locking component in order to achieve high magnetic permeability. In the present invention, d:
High magnetic permeability was obtained in the range of 60 to 90 (atomic %) and e: 1 to 8. The X component is added with the intention of improving soft magnetism, improving amorphous formation ability, and improving corrosion resistance. However, if f exceeds 15 (atomic %), the saturation magnetic flux density will decrease, so the upper limit was set at 15. Since the M component is an essential element for amorphous formation and needs to be added in an amount of 10 to 35 (atomic %), the above range was defined.

Specific examples of amorphous alloys that can be used in the present invention include Fe7sSiaB+3. Feao,
aSi6. l to sB12, Fe72(:O+0
M02B 12G41 FeaoNj l 0M04B
12C41Co6gFe4Mo2S i + ass
*Cot r Fe4Cr25114B9-IG
O? + Fe4N1).

Sl lJs, COy+ Fe412S114BO, C
ot, Fe4V2S114Be*cOaaFegNf
2S 516Bg, C071Fe4Ta2SI Ha
B* * Cots F 64Mn2sI r <89
etc. Note that all numbers indicate atomic %.

In the present invention, Cu, Sn is added to the amorphous alloy foil wire.
A material plated with one or more metals such as , Ni, Zn, Ag, and Pb can be used. The effect is that by plating the surface layer of the amorphous alloy foil wire with a highly conductive metal, it improves the shielding effect of electromagnetic waves, prevents static electricity, and makes it easy to fix the foil wire by soldering the cut surface. In addition, improvements in corrosion resistance can be mentioned.

An example of a method for plating metal such as Cu on an amorphous alloy is a method according to an invention by one of the present inventors (for example, Japanese Patent Application Laid-Open No. 61-253384), in which the plating thickness is 0.3 uta or more. 5JJm is appropriate.

The amorphous alloy foil wire used as the material for the fabric has a thickness of 20 μm to 100 μm and a width of 1 μm to 1 μm.
2 am is used, but the thickness and width are not necessarily limited to this. The fabric is made by using an amorphous alloy foil wire of a predetermined size, a metal-plated foil wire, or a wide amorphous alloy foil that has been previously metal-plated and slit into foil wires. This is carried out by conventional weaving methods such as hand-woven weaving using warp and weft, and the width of the woven fabric is 0.5 m to 2 m, but the length is not particularly limited. Furthermore, a removable auxiliary cloth made of genuine fabric measuring 20c- to 30c+a square can be attached to the part corresponding to the chest to provide protective clothing for work in a strong magnetic field environment.

Although the pacemaker protective clothing of the present invention has been described so far as an example in which a foil-like amorphous alloy fabric is used, the present invention is not limited to this. For example, amorphous alloy fibers may be filled inside clothing like a cotton insert without being knitted. Protective clothing filled with amorphous alloy fibers has the advantage of being able to omit the weaving process during production, and is light and flexible, making it comfortable to wear, but the drawback is that its shielding properties against static magnetic fields are somewhat inferior to textiles. There is.

Examples of the present invention are shown below.

[Example] (Example 1) The warp is an amorphous alloy foil wire with an alloy composition of Fe72CO1 (1MO2B + 2C4) in the atomic ratio, and a width of 6 aoa x thickness of 33 μm x length of 50 m, with a copper plating of 0.5 uffi on the surface. and used for weft, width 101 length approximately 50
A hand-woven fabric of m was woven.

This fabric was cut as shown in Figure 2, and polyester fiber fabric was glued on both sides to make a jacket-like pacemaker protective garment.
One piece of auxiliary cloth measuring 30 cm x 30 cm was attached.

Table 1 shows the magnetic shielding effect of the protective clothing of the present invention against magnetic fields generated by various commercially available permanent magnets and electromagnets.

Table 1 (l) Shielding effect on permanent magnets Table 1 (2) Shielding effect on electromagnets (Example 2) Fe7953 in atomic ratio. Fibers made of an amorphous alloy (am<thickness + 5371, width 0.2 mm) having the alloy composition B and plated with Cu were filled into a jacket having approximately the same dimensions as in FIG. 2. The space filling factor of the fibers is approximately 1. Ov
The weight of the ol zero% 1a miscellaneous material was 500 gr.

The magnetic shielding effect of protective clothing containing amorphous fibers was measured using the same method as in Example 1 for a samarium cobalt magnet. The result was 55 Gauss without protective clothing, which was reduced to 5.2 Gauss by wearing protective clothing.

[Effects of the Invention] As explained above, the protective clothing of the present invention significantly reduces the influence of surrounding magnetism in daily life, so that the pacemaker does not malfunction. Therefore, by wearing the protective clothing of the present invention, it is possible to prevent functional disorders caused by magnetism and electromagnetic waves of pacemakers, which have been a problem in the past.

In particular, the magnetism of the electromagnet that generates a high magnetic field of 2400 gauss causes magnetic interference with the pacemaker used in the experiment.The distance of 69 gauss was 1550111, but by wearing protective clothing, the distance of 69 gauss was 1550111. It shielded up to Gauss and did not interfere with the pacemaker. Therefore, it has been experimentally found that wearing pacemaker protective clothing is safe as long as the entire culm is not approached to a source of high magnetic field.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the arrangement of the electromagnet and human body model used in the experiment, and FIG. 2 is a diagram showing the appearance and dimensions of the protective clothing used in the example of the present invention. 1... Human body model, 2... Pacemaker implantation position, 3... Rotating table, 4... Electromagnet, 5... Iron core,
6...Position of the tip of the magnetic core facing the human model

Claims (1)

[Claims] 1. A fabric made of amorphous alloy fibers is cut into clothes, and at least one side is covered with synthetic fiber or natural fiber woven or knitted fabric, or leather or resin sheet and sewn. Pacemaker protective clothing. 2. Pacemaker protective clothing characterized by filling a garment cut into a predetermined shape with amorphous alloy fibers. 3. The chemical composition of the amorphous alloy is Fe_aX_bM
The pacemaker protective clothing according to claim 1 or 2, which is __c or Co_dFe_eY_fM_g. Here, X is V, Cr, Mo, Nb, W, Ta, Mn, N
i, one or more types of Co, M is one or more types of B, C, P, and Si, a: 70 to 90 (atomic %), b:
0-15, c: 10-35, but a+b+c=100
It is. Moreover, Y is V, Cr, Mo, Nb, W, Ta,
One or more of Mn, Ni, M is B, C, P, Si
One or more of the following, d: 60 to 80 (atomic%), e
:1-8, f:0-15, g:10-35, but d+
e+f+g=100. 4. Amorphous alloy fibers are used as raw materials or Cu,
The pacemaker protective clothing according to claim 1, 2 or 3, which is a fiber plated with one or more of Sn, Ni, Zn, Ag, and Pb.