Surgery – Magnetic field applied to body for therapy – Electromagnetic coil
Reexamination Certificate
1999-02-10
2001-10-30
Lacyk, John P. (Department: 3736)
Surgery
Magnetic field applied to body for therapy
Electromagnetic coil
Reexamination Certificate
active
06309340
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a magnet type medical instrument which can kill a pain in a human body by means of a magnetic field generated in it and an electromagnet and a coil used in it.
BACKGROUND ART
Generally speaking, an electromagnet used in a magnet type medical instrument which can kill a pain in a human body by means of a magnetic field generated in it comprises a core and a coil constituted by a metallic wire wound round the core and generates a magnetic field by applying an alternating current or a pulsating current to the coil.
The core of an electromagnet
30
used in a conventional magnet type medical instrument shown in
FIG. 4
is constituted by sheets of silicon steel piled up so as to be shaped like a bar for example. As for this conventional type medical instrument, as soon as an alternating current is applied to the coil on condition that the electromagnet is put horizontally and magnetic powder
32
is put near a magnetic pole
31
of the core on a paper put horizontally, the powder distant from the magnetic pole is scattered rapidly while the powder near the magnetic pole is not so scattered as shown in FIG.
4
. This means that the lines of magnetic force distant from the magnetic pole are scattered while those near the magnetic pole is not so scattered and that the magnetic flux density distant from the magnetic pole is low while that near the magnet pole is high. In case an alternating current was applied to the coil of the electromagnet
30
of the conventional type medical instrument on condition that the alternating voltage was 30V and the frequency was 50 Hz, the magnetic flux density 6 cm distant from a magnetic pole
31
of the core was 5% supposing the magnetic flux density at the magnetic pole
31
was 100%. Thus in this conventional type there is a problem that its pain-killing effect in a human body is small.
Thus, an object of the present invention is to propose an electromagnet and a coil for a magnet type medical instrument the pain-killing effect of which is large enough as it can keep high magnetic flux density even at any point distant from the magnetic pole of the core.
There is another problem in this conventional type that in case the electromagnet
30
shown in
FIG. 4
generates a magnetic field in a human body the magnetic flux density is not constant at any part of the human body because the distance from the magnetic pole is not constant resulting in low magnetic flux density at parts distant from the magnetic pole.
Thus, another object of the present invention is to propose a magnet type medical instrument which can generate a magnetic field having a relatively uniform magnetic flux density in a human body.
There is furthermore another problem in this conventional type that in case the electromagnet
30
generates a magnetic field in a human body only an alternating current of 50 or 60 Hz in frequency is used to excite the coil for the electromagnet
30
although it is known that the effect of a frequency other than 50 or 60 Hz is better.
Thus, another object of the present invention is to propose a magnet type medical instrument in which an alternating current in an optimum frequency range can excite the coil for the electromagnet
30
in the medical instrument.
DISCLOSURE OF INVENTION
The magnet type medical instrument according to the present invention shown in
FIG. 1
,
FIG. 2
, FIG.
6
and
FIG. 7
comprises a circular- or square-sectioned first core with a first inner space and a first coil which is wound round said first core and which can generate a first magnetic field by applying an alternating current, a commutated current or a pulsating current to said first coil.
Furthermore the magnet type medical instrument according to the present invention shown in
FIG. 8
to
FIG. 11
comprises a first core and a first coil as in the abovementioned embodiment and in addition a second coil which is wound in the first inner space of said first core so as to form a second inner space inside and which can generate a second magnetic field by applying an alternating current or a pulsating current to said second coil, said first coil and said second coil being wound in the same direction so that the polarity of said first magnetic field may coincide with that of said second magnetic field and the number of turns of said first coil and/or that of said second coil being regulated so that the phase of said first magnetic field may coincide with that of said second magnetic field.
Furthermore the magnet type medical instrument according to the present invention shown in
FIG. 12
to
FIG. 15
comprises a first core, a first coil, and a second coil as in the above-mentioned embodiment shown in
FIG. 8
to
FIG. 11
but said second coil is wound to its axis without forming said second inner space.
Furthermore the magnet type medical instrument according to the present invention shown in
FIG. 16
to
FIG. 19
comprises a first core, a first coil and a second coil as in the above-mentioned embodiment shown in
FIG. 8
to FIG.
11
and in addition a second core which is arranged in said second inner space
Furthermore the magnet type medical instrument according to the present invention shown in FIG.
24
and
FIG. 25
comprises a first core, a first coil, a second coil and a disk-like yoke which is stuck on an end of each of said first core and said first and second coils to enclose them.
Furthermore the first core and the second core in the above-mentioned embodiments of the magnet type medical instrument according to the present invention are constituted by steel sheets wound in a shape like a circular- or square-sectioned sleeve.
Furthermore in a magnet type medical instrument according to the present invention, said first core and said second core can be replaced by a first non-magnetic bobbin and a second non-magnetic bobbin respectively.
Furthermore the magnet type medical instrument according to the present invention shown in
FIG. 26
is characterized in that it comprises a transformer in which the primary voltage from an alternating current source to be applied to the primary winding is transformed into the secondary voltage at the secondary winding as an output voltage, a pair of electromagnets which can generate magnetic fields by applying said secondary voltage from said secondary winding to said electromagnets to kill a pain in a human body put between said electromagnets, a pair of supporting elements for supporting said pair of electromagnets for medical use, a fixing bed for sliding said pair of supporting elements so that said supporting elements may move close to or apart from each other resulting in making said electromagnets move close to or apart from said human body, and a pair of sliding terminals which are attached to said pair of supporting elements and which slide in contact with said secondary winding so as to regulate the number of turns of said secondary winding corresponding to the distance between said pair of electromagnets for medical use and a human body thereby to change said secondary voltage to be applied to said electromagnets.
Furthermore the magnet type medical instrument according to the present invention shown in
FIG. 27
is characterized in that it comprises a transformer in which the primary voltage from an alternating current source to be applied to the primary winding is transformed into the secondary voltage at the secondary winding as an output voltage, a pair of electromagnets which can generate a magnetic field by applying said secondary voltage from said secondary winding to said electromagnets to kill a pain in a human body put between said electromagnets, a pair of distance sensors which are attached to said pair of electromagnets for medical use, which emit infrared rays against said human body and which can detect a distance between said pair of electromagnets and said human body by receiving said infrared rays reflected from said human body, a pair of supporting elements, a pair of sliding terminals which are attached to said pair of supporting elements and whi
Bierman, Muserlian and Lucas
Lacyk John P.
Pulse Medical Co., Ltd.
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