The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 09, 1994
Filed:
Apr. 30, 1993
Paul C Nardella, North Easton, MA (US);
Medical Scientific, Inc., Taunton, MA (US);
Abstract
A diagnostic impedance measuring system having an elongate tissue-penetrating probe member with a plurality of axially spaced reference electrodes disposed about a distal portion of the probe. The reference electrodes measure the impedance of the biological tissue adjacent each electrode. A first comparator element compares the measured impedance of at least a first and a second of the reference electrodes, and the comparator generates a first signal indicative of the impedance difference between the two electrodes. A second comparator element compares the measured impedance between either the first or second electrode and one additional electrode, and generates a second signal indicative of the impedance difference between the two electrodes. A third comparator element compares the first and second signals and generates a third signal indicative of the impedance difference between the two signals. The third signal communicates with a signal evaluation element that determines the relative position of the probe within a patient's body.