JPS5858040A - Magnet for protecting wound - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnet made of a sintered ceramic coated with plastic for staying in the stomach to protect the stomach from injury by nails, etc. . This magnet is
It is elongated and has a uniform rectangular cross-section in a plane transverse to its longitudinal dimension. The direction of magnetization is a direction transverse to the longitudinal direction. The plastic jacket serves to retain separated pieces of the magnet in the event of accidental breakage of the magnet.

So-called "livestock magnets" have been used for many years, typically of the type disclosed in US Pat. Nos. 400 & 458. This patent is based on “Alnico (
The present invention discloses metal alloy sheathless magnets made from other proprietary non-corrosive materials such as Alnic.

This magnet is disclosed as being inserted into the rumen, or honeydew, of a cow, where the magnet stagnates and prevents any nails, wires, or clasps from being taken into the cow's body. The magnet material that attracts and holds metal objects such as barbs, barbs, etc. is said to not corrode in the stomach of a cow. This patent describes a magnet having a dog-shaped cross-section defining grooves formed on opposite sides extending along the length of the longitudinal dimension. This longitudinal direction is also the same as the direction of magnetization. Thus, this patent discloses that the magnet has magnetic poles at both longitudinal ends thereof;
It is stated that the magnet collects scrap metal along its length and that the pole ends reduce the possibility that sharp objects will assume positions that intersect the groove, ie, positions that increase the risk of perforation of the gastric wall. Yes, based on our experience over many years using the magnet described in the above patent, it is quite satisfactory that once inserted, the magnet is retained within the rumen and efficiently collects a wide variety of metal objects. I know it's Chino. Because of its size, the magnet lodges in the center of the abomasum and attracts and holds various sharp metal objects, preventing them from becoming embedded in the honeycomb lining of the stomach wall. There is. Typically, stomach acid within the rumen will eventually dissolve some of these metal articles. For example, a nail will melt in about six months. In the meantime, these articles are designed to prevent the metal articles from perforating the stomach wall even if the inward forces applied to the stomach wall by parts of the animal's body occur during movements such as lying down or standing up. held in place. However, care should be taken not to introduce more than one such magnet to an animal, as the magnets will attract each other along the length of the -♂ - - - pole of one (-) of the other (
+) Adjacent to the poles 1 As a result, the magnetic poles short-circuit each other, greatly reducing the external magnetic field.By the way, the economics of using such a magnet depends on its price.For example, "Alnico- V' consists of iron, cobalt, nickel, aluminum and copper. Some of these components are dependent on imports from other countries, and the difficulty of obtaining them must be taken into account. Cobalt is approximately 24 fM per 100 parts of the alloy composition.
, and their prices have been rising dramatically recently. The selling price of Alnico-vB stone is more than three times what it used to be.

A principal object of the present invention is to provide a livestock magnet made from materials that are more readily available and more easily manufactured than materials heretofore considered necessary.

Obtaining alternative magnet materials has been considered difficult due to some commonly held off-the-shelf concepts.For example, to be useful, any magnet must not only be shaped It has been thought that the magnetic poles and working characteristics must be in line with the above patent formula or other magnets that have been proven to be effective for this purpose. The weight must be such as to allow continued retention of the magnet within the abomasum, and an elongated bar shape is chosen.

Regarding magnetic polarization, the direction of polarization is essentially specified in that the total magnetic field lines realized in an external magnetic field are a function of the pole area and magnet length as well as the residual magnetic flux density or coercivity of the particular magnetic material. Assuming an elongated shape and physical dimensions, it is necessary to select a material in which a sufficiently high external magnetic field can exist and a material with sufficiently high demagnetization resistance.
These considerations must also be made in conjunction with the need to use non-corrosive materials. The range of choices is substantially limited.

For example, "Alnico-V" has a demagnetizing resistance of 1
A typical magnet made of this material, which has a residual magnetic flux density (so-called residual induction) of 2.8 kilogauss and a coercive force of 600 to 6400 mm, has a field line of 1 to 700 when in the form described in the above patent. has an external magnetic field of 71
When in the form of a simple cylinder of inch diameter, it has a magnetic force of up to 2,000 IiI. Many magnetic materials are
Assuming that magnets of the same size, shape, and magnetization orientation are produced, the residual magnetic flux density is too low and is therefore excluded from this application. The present invention does not depart from the gist of the cited patent. In part, transversely magnetized elongated magnets work well for this gastroprotective application, as well as traditional alnico
The proposed method offers certain unique advantages in achieving sufficient magnetic flux using readily available magnetic materials, including sintered ceramic materials, which have been deemed unacceptable as substitutes for V. It is characterized by recognition based on subsequent research and testing.

In addition to providing a non-corrosive cover, it also provides an additional action in the event of a chipping or breakage of the ceramic magnet, in which case the integrity of the cover is preserved. , the magnet continues to work - and the animal is protected from lead-pointed or jagged edges caused by breakage of the magnetic material.

Referring now to the drawings, the drawings show generally at 12 a preferred embodiment of the invention. The magnet body consists of a one-piece magnet 14 of oriented sintered heptemic magnetic material and a cladding 16 of polymeric material that completely covers it.

The thickness of the covering 16 is exaggerated for illustration purposes. The magnet 14 is elongated, has a longitudinal dimension, and has a uniform cross-section throughout its length in a plane perpendicular to the longitudinal dimension. The @ cross-section is indicated as width W and thickness T. Preferably, the values of %L%3, 3W and T are 2T/1, 2T and 2T, respectively, although variations from these dimensions may also be made in a size and shape that will allow stagnation in the animal's rumen. It is possible as long as it is possible. Preferably, all edges and corners of magnet 14 are slightly rounded as shown.

The composition of the magnet 14 is preferably MO.6 (F town OS)
(here, MO represents one or more oxides of one or more metals selected from the group of barium, strontium, and lead). A preferred material is commercially available from Magnetics and Electronics, Inc. under the tradename "Arnox-aJ."

At 20° C., Arnox 8 has a typical residual inductance or flux density of about 485 K4 Gauss and a coercivity of about 29,000 e as used in magnetically oriented form. Contrast these values shown above for Alnico-V. The high coercive force of this ceramic magnet material is a measure of its relatively high demagnetization resistance compared to alnico materials. The direction is perpendicular to the longitudinal dimension as opposed to the direction. The magnetic pole size corresponds to the value of T. Contrary to speculation from previous patents, it has been found that transverse magnetization does not increase the chance of gastric wall perforation, yet provides certain benefits. This is in view of the teaching of the above-mentioned patent that a magnet should be provided with magnetic poles at each longitudinal end so that along its length a magnet collects scrap metal, i.e., a nail is attracted thereto along the length of the magnet. This was completely unexpected. In the above patent, an elongated groove was formed according to this idea, and the nail was sucked into it. However, there is a simple shape without grooves as described here. And a magnet with transverse polarization is
It has been found that sagging is also very effective in reducing the possibility that objects such as nails will be attracted to the magnet in its longitudinal position. The main utility of the magnet lies in the fact that it attracts and holds metal objects and prevents them from becoming embedded within the honeycomb lining of the stomach, where the possibility of perforating the stomach wall is greatest. Therefore, the orientation of the metal article on the magnet itself when attracted to the magnet is of relatively little significance. In practice, a magnet that attracts a large number of objects, such as nails, clasps, etc., can be used within the central part of the abomasum, where accidental contact by parts of the stomach lining will have virtually no effect on the area around the magnet surface. It remains at a location where it merely changes the relative position of the objects more or less clustered together.

The transverse polarization is of great significance in that it typically allows the use of Ceranovine materials, which have substantially lower remanence flux densities than, for example, Alnico-V, for this particular application. This is the difference between the pole area, the magnetic length and the total external magnetic flux and the 1 inch dimension, W and i
For the "Arnox 8" magnets as described above, each having , the external magnetic field is 25,4[10 field lines, which exceeds that value for any of the prior art magnets.

Another benefit arising from transverse magnetization is also realized when one or more 8-stones are administered to an individual animal. In this case, for example, two magnets are The condition in which it is in contact with the other (+) pole surface is (2) with dimensions T and L.
However, these forms are paired by adhering to each other along their length in either of two forms, with the (-) pole of one adjacent to and in contact with the (+) pole of the other. Neither of these causes the reduction in external magnetic field as seen in the Alco-■ magnet, which has magnetic poles at both ends.

As shown in FIG. 2, magnet 14 is covered by a continuous covering 16. As shown in FIG. The covering is selected from polymeric materials that are not degraded by animal stomach acid. An example is epoxy resin, which can be coated around the magnet by gripping the magnet in a holder and dipping the holder into a fluidized bed of resin. 1 even if it happens
The plastic sheath 16 serves to retain the loose pieces, and for this purpose the sheath 16 is sufficiently thick and has sufficient tear strength to resist tearing. The covering then acts as a retainer, retaining ceramic debris that may have sharp edges and preventing them from injuring the animal.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a preferred embodiment of the magnet of the present invention,
Figure 2 is a cross-sectional view taken along the line 2-2. March 160, 160 Patent Office Commissioner Shima 1) Indication of the Haruki Tono case 1982 Patent Application No. 154005;'
J. Title of the invention Person who corrects the scratch protection magnet Relationship to the subject Name of patent applicant
Interbet Incorporated Agent Name (7563) Patent Attorney Kurahashi
-j・1. ,”,,”） ゛7 Application form 0 Inventor - 11 Applicant column 1.11- Power of attorney and its translation 1 drawing each 1 content of amendments Engraving of drawings as attached (no change in content) )

Claims (1)

[Claims] 1) General formula MO.6 (P@5os), where MO is selected from the group of barium, fluorontium and lead.
an elongated magnet formed from a sintered material having an oxide of one or more metals) that is large enough to remain permanently lodged in the rumen of a domestic animal and that extends across its longitudinal dimension. magnetized in a direction transverse to the longitudinal dimension to have a pole face consisting of one maximum area surface with a rectangular cross-section in the plane, and the longitudinal dimension is at least two times larger than either of the cross-sectional dimensions.
A domestic animal comprising an elongated magnet and a continuous polymeric covering surrounding the magnet and having a substantially uniform thickness and sufficient tear strength to resist tearing if the magnet is broken. 2) The magnetic rod according to claim 1, which has a cross section that is substantially uniform throughout the longitudinal direction. 3) A method for protecting the rumen from injury when livestock take in iron-based products, the method being to protect the rumen of livestock from general formula MO・6 (
F@1on) (where MO is an oxide of one or more metals selected from the group of barium, strutium and lead); 2 Large enough to remain permanently in the stomach, having a rectangular cross-section in a plane transverse to the longitudinal dimension, and magnetized in the transverse direction to have a pole face consisting of the largest area surface. an elongated magnet having a longitudinal dimension at least twice as large as any of its cross-sectional dimensions; said method comprising inserting a bar magnet consisting of a continuous polymer coating having varying thicknesses.