Apparatus for detecting properties, differences and changes of human animal bodies

• US 5,109,855 A
• Filed: 07/05/1988
• Issued: 05/05/1992
• Est. Priority Date: 07/14/1986
• Status: Expired due to Fees

• Current Assignee: Handelsgesellschaft Fur Medizin und Technik Mit Beschrankter Haftung D 8060 Dachau Pollnstrasse 3A German Federal Republic
• Original Assignee: Handelsgesellschaft Fur Medizin und Technik Mit Beschrankter Haftung
• Inventors: Gunter, Kirchhoff
• Primary Examiner(s): Smith, Ruth S.
• Application Number:
  US07/215,398
• Time in Patent Office: 1,400 Days
• Field of Search: 128/653, 128/735, 128/907, 128/804
• US Class Current: 600/407
• CPC Class Codes: A61B 5/05 Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves impedance plethysmography A61B5/0295; measuring movement of the entire body or parts thereof A61B5/11; detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof A61B5/24

Abstract

An apparatus for detecting properties, differences and changes in bodies, ing an a.c. source, which has one terminal that is directly or indirectly connected to the body to be examined, and an electric measuring device, which is coupled between the other terminal of the a.c. source and a sensing electrode. The sensing electrode is moved over the surface of the body, wherein at least one spacer is provided on the sensing electrode and the sensing electrode is spaced from the body. The electrode and the spacer is provided with at least one grounded layer, covering or shield consisting of conductive material. At least one of the layers, coverings or shields serves to shield the electrode and/or the lead connected to the electrode.

Claims

1. An apparatus for detecting properties, differences and changes of bodies, comprising

an a.c. source having two terminals, one terminal being adapted to be connected to a body to be examined,

a sensing electrode,

an electric measuring device coupled between the other terminal of the a.c. source and said sensing electrode,

a plurality of spacers arranged one over the other being provided on the sensing electrode and being selectively replaceable for varying a measured effect by the electric measuring device and for varying a distance the sensing electrode is spaced from a surface of the body,

at least one grounded layer surrounding said sensing electrode consisting of a conductive material serving to shield the sensing electrode and having a forward edge adapted to contact the body to be examined and to effect a grounding of the a.c. source.

2. Apparatus according to claim 1, wherein said at least one ground layer is connected to a low electric potential, which effects a shielding or leakage like a ground potential.

4. An apparatus according to claim 1, wherein frequency is between 250 kHz.

3. An apparatus for detecting properties, differences and changes of bodies, comprising

an a.c. source having two terminals, one terminal being adapted to be connected to a body to be examined and having a frequency between 150 and 950 kHz,

a sensing electrode,

an electric measuring device coupled between the other terminal of the a.c. source and said sensing electrode,

at least one spacer being provided on the sensing electrode and the sensing electrode being spaced from a surface of the body,

at least one grounded layer surrounding said sensing electrode consisting of a conductive material serving to shield the electrode and having a forward edge adapted to ccontact the body to be examined and to effect a grounding of the a.c. source.

5. An apparatus for detecting properties, differences and changes of bodies, comprising

an a.c. source having two terminals, one terminal being adapted to be connected to a body to be examined,

sensing electrode,

an electric measuring device coupled between the other terminal of the a.c. source and said sensing electrode,

a plurality of spacers arranged one over the other being provided on the sensing electrode and being alterable in number for varying a measured effect by the electric measuring device and the sensing electrode being spaced from a surface of the body,

at least one grounded layer surrounding said sensing electrode consisting of a conductive material serving to shield the electrode and having a forward edge adapted to contact the body to be examined and to effect a measurable leakage of the a.c. source.