title: Determination of tissue type surrounding a needle tip by electrical bioimpedance.
abstract: A novel method for determining needle position based on local tissue impedance and electrode polarization data, is presented. Measurements of electrical impedance in a small volume around a needle tip can aid in determining if the needle is in the desired tissue. There are many possible applications for this technique, such as needle positioning when administering drugs in blood vessels or muscle tissue, for epidural analgesia or needle EMG exams.
authors.affiliation: Department of Clinical and Biomedical Engineering, Rikshospitalet HF, NO-0027 Oslo, Norway. havard.kalvoy@rikshospitalet.no
authors.forename: Havard
authors.initials: H
authors.lastname: Kalvoy
authors.forename: Orjan G
authors.initials: OG
authors.lastname: Martinsen
authors.forename: Sverre
authors.initials: S
authors.lastname: Grimnes
mesh_terms: D000273:Adipose Tissue / Q000502:physiology*; D000818:Animals; D017097:Electric Impedance; D004566:Electrodes; D004594:Electrophysiology / Q000295:instrumentation / Q000379:methods*; D009132:Muscles / Q000502:physiology*; D009339:Needles; D010865:Pilot Projects; D013552:Swine