Magnetic system for medical instrument

G - Physics – 01 – N

Patent

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Details

G01N 11/10 (2006.01) C12Q 1/56 (2006.01) G01N 11/16 (2006.01) G01N 33/49 (2006.01) G01N 33/86 (2006.01)

Patent

CA 2170043

An instrument (100) monitors the coagulation of coagulable fluid blood, blood fraction or a control (514) by combining (101) the coagulable fluid (514) with particles which are affected by a magnetic field so that the particles become suspended relatively freely in the fluid. A time-varying magnetic field (2 Hz) causes the particles to be reori- ented as the magnetic field varies. The reorientation changes as the fluid (514) coagulates owing to the fluid's (514's) changing viscosity. An electromagnet (140) creates the time-varying magnetic field. The electromagnet (140) includes a core (150) comprising a first leg (148), an electrically conductive coil (144) for creating a time-varying magnetic flux in the core (150), and a return (152) for the time-varying magnetic flux. The first leg (148) and the flux return (152) together comprise a generally E-shaped core (150) of ferromagnetic material. A bobbin (146) is provided on the first leg (148) and the electrically conduc- tive coil (144) is wound on the bobbin (146).

Un instrument (100) contrôle la coagulation de sang fluide coagulable, d'une fraction du sang ou d'un témoin (514) par la combinaison (101) du fluide coagulable (514) avec des particules affectées par un champ magnétique, de telle sorte que les particules sont mises en suspension de façon relativement libre dans le liquide. Un champ magnétique (2 Hz) variable dans le temps réoriente les particules selon ses variations. La réorientation change lorsque le liquide (514) coagule, du fait du changement de sa viscosité. Un électro-aimant (140) crée le champ magnétique variable dans le temps. Il comprend un noyau (150) pourvu d'un premier bras (148), un enroulement électroconducteur (144) destiné à créer un flux magnétique variable dans le temps dans le noyau (150), et un retour (152) pour le flux magnétique variable dans le temps. Le premier bras (148) et le retour de flux (152) forment ensemble un noyau (150) sensiblement en forme de E, fait de matériau ferromagnétique. Une bobine (146) est prévue sur le premier bras (148) et l'enroulement électroconducteur (144) est enroulé sur la bobine (146).

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