# US 6,213,934 B1 · Electromagnetic bone-assessment and treatment: apparatus and method

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- Number: US 6,213,934 B1
- Document ID: US6213934B1
- Status: Granted
- Kind: B1
- Application number: 09/070,069
- Filed: 1998-04-30
- Granted: 2001-04-10
- Earliest claimed: 1995-06-01
- Assignees: Hyper3D Corp.
- Inventors: Bruno Bianco; Alessandro Chiabrera; Jonathan J. Kaufman
- Web page: https://patentgrep.com/patent/US6213934B1

## CPC

- A61B 5/4509: {Bone density determination}
- A61B 5/053: Measuring electrical impedance or conductance of a portion of the body
- A61B 5/417: {the bone marrow}
- A61B 5/4504: {Bones (A61B5/4547 takes precedence)}
- A61B 5/7257: {using Fourier transforms}
- A61B 5/7264: {Classification of physiological signals or data, e.g. using neural networks, statistical classifiers, expert systems or fuzzy systems}
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)

## Abstract

Non-invasive quantitative in-vivo electromagnetic evaluation of bone is performed by subjecting bone to an electrical excitation waveform supplied to a single magnetic field coil near the skin of a bony member, and involving a repetitive finite duration signal consisting of plural frequencies that are in the range 0 Hz-200 MHz. Signal-processing of a bone-current response signal and a bone-voltage response signal is operative to sequentially average the most recently received given number of successive bone-current and bone-voltage response signals to obtain an averaged per-pulse bone-current signal and an averaged per-pulse bone-voltage signal, and to produce their associated Fourier transforms. These Fourier transforms are further processed to obtain the inductively determined frequency-dependent bone-admittance function. A neural network, configured to generate an estimate of one or more of the desired bone-related quantities, is connected for response to the bone-admittance function, whereby to generate the indicated estimates of bone status, namely, bone-density, bone-architecture, bone-strength and bone-fracture risk. In another embodiment, a stochastic electromagnetic field generated by a single magnetic field coil is used to therapeutically treat living tissue in vivo.

## Claims

### Claim 1

A method of non-invasively therapeutically treating living tissue in a living body, comprising the steps of:
(a) placing a magnetic field coil near said living tissue of said living body, said magnetic field coil and living tissue comprising a one-port electrical network;
(b) connecting an electrical signal generator to said one-port electrical network; and,
(c) generating an electromagnetic field within said living tissue, said electromagnetic field being pseudo-random.

### Claim 2 (depends on 1)

The method of claim 1 wherein said electromagnetic field has a “1/f” power spectrum.

### Claim 3 (depends on 2)

The method of claim 2 wherein said power spectrum includes energy ranging from about 1 Hz to about 1000 Hz.

### Claim 4 (depends on 2)

The method of claim 2 wherein said power spectrum includes energy ranging from about 1 Hz to about 1000 Hz.

### Claim 5

A method of non-invasively therapeutically treating living tissue in a living body, comprising the steps of:
(a) placing a magnetic field coil near said living tissue of said living body, said magnetic field coil and living tissue comprising a one-port electrical network;
(b) connecting an electrical signal generator to the said one-port electrical network; and,
(c) generating an electromagnetic field within said living tissue, said electromagnetic field being stochastic.

### Claim 6 (depends on 5)

The method of claim 5 wherein said electromagnetic field has a “1/f” power spectrum.