Patent ID: 6830551
Filing Date: 2004-12-14
Classification: A61B

Abstract:
A body fluid measuring apparatus comprising a main body and a body fluid sampler fitted to the main body,wherein the body fluid sampler comprises a fixed member fixed to the main body and a movable member guided by the fixed member, the fixed member being formed with a body fluid-sucking chamber open at a tip of the fixed member and a through-hole communicating therewith, the movable member comprising a lancet acting as a first electrode, the movable member being reciprocatively movable for bringing a tip of the lancet into and out of the tip of the fixed member, the body fluid-sucking chamber being provided with a second electrode and a reactive layer containing a reactive reagent necessary for measurement, wherein the main body comprises an electronic circuit for providing a measurement on the basis of an electrical signal from the lancet as the first electrode and the second electrode, and a drive mechanism which drives the movable member for causing the tip of the lancet to project from the tip of the fixed member, wherein the fixed member comprises a cylindrical electrode acting as the second electrode and an insulator for electrically separating the cylindrical electrode from the lancet, the cylindrical electrode and the lancet being concentrically arranged, and wherein a surface of the insulator facing the lancet is hydrophobically treated.