Title:
【発明の名称】骨内または骨上の圧力および圧力変化の生体内測定用装置
Document Type and Number:
Japanese Patent JP2003518973
Kind Code:
A
Abstract:
The device for the in vivo measurement of pressures and pressure variations in or on the human or animal body, more particularly inside or outside bones, is composed of an implantable probe (1) and of an evaluating unit (3), the probe (1) comprising an oscillating circuit (L-C) including a capacitor in the form of a pressure sensor (8, 30) and a coil (13), and the evaluating unit (3) comprising a resonance oscillating circuit capable of detecting the natural frequency (Fe) of the oscillating circuit, is variable according to variations of a dimension of the capacitor caused by pressure variations. The pressure sensor (8) is spatially separated from the coil (13) and connected to the latter by an electric conductor (15). On one hand, this allows small dimensions of the implantable pressure sensor, and on the other hand, a clear signal transmitted over a relatively long distance. In the first place, such a measuring device allows to monitor the accretion of a bone to a prosthesis, or quite generally, to detect the behaviour of a bone or another organ e.g. under load.
Inventors:
Evry Nicolaus
Graf Albert
Wunderli Peter Her
Graf Albert
Wunderli Peter Her
Application Number:
JP2001549544A
Publication Date:
June 17, 2003
Filing Date:
December 19, 2000
Export Citation:
Assignee:
Imatec AG
International Classes:
G01L1/14; A61B5/00; A61B5/03; A61B17/56; G01L5/00; (IPC1-7): A61B5/00; A61B17/56; G01L1/14
Attorney, Agent or Firm:
Yatsuage Yoji (2 outside)