Patent ID: 7258673
Filing Date: 2007-08-21
Classification: A61B

Abstract:
1. An interstitial fluid (ISF) extraction device comprising: a penetration member configured for penetrating a target site of a user's skin layer and, subsequently, residing in the user's skin layer and extracting an ISF sample therefrom; and at least three concentrically-arranged pressure rings, each of the at least three concentrically-arranged pressure rings adapted for applying pressure to the user's skin layer in the vicinity of the target site while the penetration member is residing in the user's skin layer, wherein the ISF extraction device is configured such that the at least three concentrically-arranged pressure rings apply pressure in an oscillating manner with asymmetric deployment and retraction cycle timing, and wherein only one of the at least three concentrically-arranged pressure rings is deployed at a time, whereby an ISF glucose lag of the ISF sample extracted by the penetration member is mitigated.