TANK FILTERS ADAPTABLE FOR PLACEMENT WITH A GUIDE WIRE, IN SERIES WITH THE LEAD WIRES OR CIRCUITS OF ACTIVE MEDICAL DEVICES TO ENHANCE MRI COMPATIBILITY
First Claim
1. A medical device, comprising:
- an active medical device (AMD);
a lead wire extending from the AMD;
a band stop filter associated with the lead wire, for attenuating current flow through the lead wire at a selected frequency, wherein the band stop filter comprises a capacitor in parallel with an inductor, said parallel capacitor and inductor placed in series with the lead wire, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at the selected frequency; and
a passageway through the band stop filter permitting selective slidable passage of a guide wire therethrough.
6 Assignments
0 Petitions
Accused Products
Abstract
A tank filter is provided for a lead wire of an active medical device (AMD). The tank filter includes a capacitor in parallel with an inductor. The parallel capacitor and inductor are placed in series with the lead wire of the AMD, wherein values of capacitance and inductance are selected such that the tank filter is resonant at a selected frequency. A passageway through the tank filter permits selective slidable passage of a guide wire therethrough for locating the lead wire in an implantable position. The Q of the inductor may be relatively maximized and the Q of the capacitor may be relatively minimized to reduce the overall Q of the tank filter to attenuate current flow through the lead wire along a range of selected frequencies. In a preferred form, the tank filter is integrated into a TIP and/or RING electrode for an active implantable medical device.
186 Citations
42 Claims
-
1. A medical device, comprising:
-
an active medical device (AMD); a lead wire extending from the AMD; a band stop filter associated with the lead wire, for attenuating current flow through the lead wire at a selected frequency, wherein the band stop filter comprises a capacitor in parallel with an inductor, said parallel capacitor and inductor placed in series with the lead wire, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at the selected frequency; and a passageway through the band stop filter permitting selective slidable passage of a guide wire therethrough. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A medical therapeutic device, comprising:
-
a tank filter placed in series with a conductor and having electrical inductance in parallel with capacitance, whereby the tank filter attenuates current flow at a selected frequency band; wherein the tank filter comprises; a tubular capacitor electrically connected to the conductor and an electrode; an inductor electrically connected to the conductor and the electrode, the inductor comprising a spiral winding around a ferro-magnetic core disposed within the capacitor; a sleeve disposed over the inductor for creating a ferro-magnetic field to reduce or prevent saturation of inductor in presence of a static magnetic field; and a passageway permitting selective slidable passage of a guide wire therethrough. - View Dependent Claims (23, 24)
-
-
25. A band stop filter for a lead wire of an active medical device (AMD), the filter comprising:
-
a capacitor in parallel with an inductor, said parallel capacitor and inductor combination placed in series with the lead wire, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at a selected frequency; and a passageway extending through the band stop filter permitting selective slidable passage of a guide wire therethrough. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
-
-
36. A medical device, comprising:
-
an active medical device (AMD); a probe or catheter extending from the AMD and having a TIP, RING or PAD electrode; a passageway extending through the probe or catheter, permitting slidable passage of a guide wire therethrough; and a band stop filter associated with the catheter or probe electrodes, for attenuating current flow through the probe or catheter at a selected frequency, wherein the band stop filter comprises a capacitor in parallel with an inductor, said parallel capacitor and inductor placed in series with the probe or catheter electrode, wherein values of capacitance and inductance are selected such that the band stop filter is resonant at the selected frequency, wherein the overall Q of the band stop filter is reduced to attenuate current flow through the lead wire along a range of selected frequencies. - View Dependent Claims (37, 38, 39, 40, 41, 42)
-
Specification