University of Sheffield

Sheffield Teaching Hospitals Nhs Foundation Trust

Zilico Limited

John Anthony Tidy

Brian Hilton Brown

Apparatus for measuring the electrical impedance of a tissue sample comprises a probe and a sheath comprising an elongated tubular body having one closed end and one open end providing an internal cavity. The sheath is composed of a material which when contacted with a tissue sample is capable of providing a conductive path through the sheath between the electrodes and the tissue sample. The resistivity of the material forming the sheath when contacted with the tissue sample is greater than the resistivity of the tissue sample. The probe is received within the internal cavity of the sheath. The sheath is impervious to bacteria and viruses.

Apparatus for measuring tissue samples electrical impedance

A method for determining whether a probe for measuring the impedance of human or animal body tissue has been placed over a boundary between different tissue types is described. The probe used in the method comprises at least a first (), a second (), a third () and a fourth () electrode arranged such that the third () and fourth () electrodes are each located substantially the same distance from both the first () and second () electrodes. The method comprises: driving a current between the first () and the second () electrodes; measuring a first value of an electrical parameter between the third () and the fourth () electrode; and determining whether the probe has been placed over a boundary between different tissue types based on the first value. A probe for carrying out the method is also described.

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Sheffield, United Kingdom

John Anthony Tidy