Current sensor for medical devices including connector cables

Details Current sensor for medical devices including connector cables Current sensor for medical devices including connector cables

G - Physics

01

R

G01R 19/10 (2006.01) A61B 17/00 (2006.01) A61B 18/14 (2006.01) A61B 18/12 (2006.01)

Patent

CA 2111617

A current sensing device enables sensing the current being delivered from a source to a load at a medical implement connected to the distal end of a primary conductor connected between the source and the load in situations wherein distributed capacitance between the primary conductor and a return path to the source prevents a measurement of current at the source end of the primary conductor from being an accurate measurement of the delivered current. The current sensing device comprises a reference conductor which is located beside and twisted together with the primary conductor along the length thereof but which terminates short of, and is not connected to, the medical implement load, and a subtractor for subtracting the current flowing through the reference conductor from the total load current flowing to the medical implement so as to offset the effect of the distributed capacitance and to thereby produce a current measurement corresponding to the delivered current. The subtractor can comprise a current transformer through which the conductors extend in opposing relation. An integrity detector monitors whether the reference conductor is intact.

La présente invention vise un détecteur de courant permettant de capter le courant transmis d'une source à une charge au sein d'un instrument médical relié à l'extrémité distale d'un conducteur primaire monté entre la source et la charge, lorsque la capacité répartie entre le conducteur principal et le trajet de retour à la source ne permet pas de mesurer avec exactitude le courant transmis du coté source du conducteur principal. Le détecteur de courant se compose d'un conducteur de référence longeant le conducteur principal et torsadé avec ce dernier, mais se terminant avant la charge de l'instrument médical sans y être raccordé, et d'un composant réducteur servant à réduire le courant traversant le conducteur de référence du courant de charge total transmis à l'instrument médical de manière à compenser l'effet de la capacité répartie et ainsi de permettre d'obtenir une mesure du courant correspondant effectivement au courant acheminé. Le composant réducteur peut comprendre un transformateur de courant dans lequel pénètrent les conducteurs montés en vis-à-vis. Un contrôleur d'intégrité vérifie que le conducteur de référence demeure intact.

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