US4683873A
Expired / Lapsed
US
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Method and device for treating living tissues and/or cells by means of pulsating electromagnetic fields
Assignee: Howmedica Osteonics Corp
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Filing: 1986-11-12
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Granted: 1987-08-04
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Expires: 2006-11-12
Abstract
Abstract A method for treating living tissues and/or cells consisting essentially of electromagnetically inducing in the tissue and/or cells alternating pulsating electrical signals having a wave form which comprises a positive portion with a duration of between 1 and 3 milliseconds, and a negative portion having a peak value less than that of the positive portion, followed by a region of exponential extension tending to the reference value zero.
Inventors
- 👤 Ruggero Cadossi
- 👤 Donata Marazzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
A; A61; A61N; A61N2/00; A61N2/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
186 words
A method for treating living bone tissue by means of pulsating electromagnetic fields to stimulate the growth of said tissue, consisting essentially of electromagnetically inducing in the tissue alternating pulsating electrical signals having a wave form which comprises a positive portion composed, in chronological order, of a first, a second and a third segment, the first of which defines the peak value of said positive portion, and a negative portion composed respectively of a segment which defines the peak value and constitutes the prolongation of the third segment of said positive portion and a region of exponential extension tending to the reference value zero; the positive portion taken together with the zero signal base line having substantially the shape of a trapezium, the peak value of the positive portion being greater in absolute magnitude than the peak value of the negative portion, the duration of said positive portion being between 1 and 3 milliseconds and the frequency of repetition of said pulsating electrical signals being greater than 50 Hz, with said treatment causing substantial formation of periosteal callus in the region of said bone tissue growth.
Claim 2
Independent Claim
186 words
A method for treating living bone tissue by means of pulsating electromagnetic fields to stimulate the growth of said tissue, consisting essentially of electromagnetically inducing in the tissue alternating pulsating electrical signals having a wave form which comprises a positive portion composed, in chronological order, of a first, a second and a third segment, the first of which defines the peak value of said positive portion, and a negative portion composed respectively of a segment which defines the peak value and constitutes the prolongation of the third segment of said positive portion and a region of exponential extension tending to the reference value zero; the positive portion taken together with the zero signal base line having substantially the shape of a trapezium, the peak value of the positive portion being greater in absolute magnitude than the peak value of the negative portion, the duration of said positive portion being between 1 and 3 milliseconds and the frequency of repetition of said pulsating electrical signals being greater than 50 Hz, with said treatment causing substantial formation of periosteal callus in the region of said bone tissue growth.
Claim 3
Dependent Claim
32 words
A method as claimed in claim 1, wherein said electromagnetic field has a value such as to induce in said tissue a current density of between 2 and 30 microamperes/cm 2 .
Claim 4
Dependent Claim
21 words
A method as claimed in claim 2 wherein the duration of the treatment is between 8 and 14 hours per day.
Claim 5
Dependent Claim
24 words
A method as claimed in claim 2 wherein in that the zone subjected to treatment is immobilized by suitable means not possessing magnetic properties.
Claim 6
Dependent Claim
21 words
A method as claimed in claim 1 wherein the duration of the treatment is between 8 and 14 hours per day.
Claim 7
Dependent Claim
22 words
A method as claimed in claim 5 wherein the zone subjected to treatment is immobilized by suitable means not possessing magnetic properties.
Claim 8
Dependent Claim
22 words
A method as claimed in claim 1 wherein the zone subjected to treatment is immobilized by suitable means not possessing magnetic properties.
Claim 9
Independent Claim
231 words
A device for treating living bone tissue by means of pulsating electromagnetic fields to stimulate the growth of said tissue, comprising a D.C. power supply unit having an output, oscillator means capable of generating a square wave and having an output, and an oscillation circuit connected across the outputs of said power supply unit and oscillator means, said oscillator circuit including at least one inductor which generates an alternating pulsating electromagnetic field which, within said tissue, induces electrical signals having a wave form which comprises a positive portion composed, in chronological order, of a first, a second and a third segment, the first of which defines the peak value of said positive portion, and a negative portion composed respectively of a segment which defines the peak value and constitutes the prolongation of the third segment of said positive portion, and a region of exponential extension tending to the reference value zero; the positive portion taken together with the zero signal base line having substantially the shape of a trapezium, the peak value of the positive portion being greater in absolute magnitude than the peak value of the negative portion, the duration of said positive portion being between 1 and 3 milliseconds and the oscillation frequency of said oscillator means being greater than 50 Hz, whereby said treatment causes substantial formation of periosteal callus in the region of said bone tissue growth.
Claim 10
Independent Claim
231 words
A device for treating living bone tissue by means of pulsating electromagnetic fields to stimulate the growth of said tissue, comprising a D.C. power supply unit having an output, oscillator means capable of generating a square wave and having an output, and an oscillation circuit connected across the outputs of said power supply unit and oscillator means, said oscillator circuit including at least one inductor which generates an alternating pulsating electromagnetic field which, within said tissue, induces electrical signals having a wave form which comprises a positive portion composed, in chronological order, of a first, a second and a third segment, the first of which defines the peak value of said positive portion, and a negative portion composed respectively of a segment which defines the peak value and constitutes the prolongation of the third segment of said positive portion, and a region of exponential extension tending to the reference value zero; the positive portion taken together with the zero signal base line having substantially the shape of a trapezium, the peak value of the positive portion being greater in absolute magnitude than the peak value of the negative portion, the duration of said positive portion being between 1 and 3 milliseconds and the oscillation frequency of said oscillator means being greater than 50 Hz, whereby said treatment causes substantial formation of periosteal callus in the region of said bone tissue growth.
Claim 11
Dependent Claim
54 words
A device as claimed in claim 8 wherein said oscillation circuit further includes a diode connected between the outputs of said power supply unit and oscillator means, and a capacitor connected between the output of said power supply unit and ground, with said diode and said at least one inductor being connected in parallel.
Claim 12
Dependent Claim
28 words
A device as claimed in claim 9 wherein said device further comprises means for adjusting the voltage generated by said power supply unit between 100 and 300 volts.
Claim 13
Dependent Claim
19 words
A device as claimed in claim 10, wherein said inductor has an impedance of between 400 and 600 ohms.
Claim 14
Dependent Claim
19 words
A device as claimed in claim 9, wherein said inductor has an impedance of between 400 and 600 ohms.
Claim 15
Dependent Claim
31 words
A device as claimed in claim 12, wherein said oscillation circuit includes a pair of inductors, between which, when in operation, there is placed said tissue to be subjected to treatment.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |