United States Patent 
Gallup et al.
[li] Patent Number:  Date of Patent:
 BODY COMPOSITION ANALYZER
 Inventors: David A. Gallup; Joseph M. Mercola, both of Schaumburg; William E. Shaw, Palatine, all of 111.
 Assignee: Body Composition Analyzers, Inc., Schaumburg, 111.
 Appl. No.: 907,028
 Filed: Jul. 1,1992
 Int. C1.5 A61B5/05
 U.S. CI 128/734
 Field of Search 128/734, 741, 630, 632,
128/693, 774, 897-898, 903
 References Cited
U.S. PATENT DOCUMENTS
4,008,712 2/1977 Nyboer 128/734
4,895,163 1/1990 Libke et al 128/734
4,911,175 3/1990 Shizgal 128/734
4,947,862 8/1990 Kelly 128/734
4,949,727 8/1990 Yamazaki et al 128/734
5,003,984 4/1991 Muraki et al 128/903 X
Primary Examiner—Angela D. Sykes
Attorney, Agent, or Firm—McAndrews, Held & Malloy
A body composition analyzer provides the resistive and reactive components of a body's measure impedance as well as body fat information and ideal weight information. The analyzer includes an analog circuit under the control of a microprocessor for providing signals to the microprocessor that are representative of the voltage across the network formed by the body and of the voltage across a reference network of known impedance that is connected in series with the body network. The microprocessor calculates the body networks impedance as a function of the ratio of the body network voltage and reference network voltage signals to provide extremely accurate results. The body composition analyzer is a hand-held unit that can transmit data to a peripheral device for recording via a wireless communication network. The analyzer is further programmable so that various algorithms and constants stored therein can be updated.
58 Claims, 16 Drawing Sheets