Apparatus and method for shunting induced currents in an electrical lead
First Claim
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1. An electrical lead, comprising:
- an elongate body having a proximal end portion and a distal end portion;
a first electrode joined to the distal end portion of the elongate body;
a first conductor extending within the elongate body between the proximal end portion and the distal end portion and being electrically coupled to the first electrode;
a second electrode disposed adjacent the first electrode and joined to the elongate body;
a second conductor extending within the elongate body between the proximal end portion and the distal end portion and being electrically coupled to the second electrode; and
a capacitive device electrically coupling the first conductor to the second electrode within the elongate body;
wherein the first electrode serves as a cathode and the second electrode serves as an anode for bipolar pacing and sensing of body tissue; and
the capacitive device has an electrical impedance substantially less than an electrical impedance of the body tissue at signal frequencies associated with MRI and diathermy and has an electrical impedance substantially greater than an electrical impedance of the body tissue at signal frequencies used for pacing and sensing.
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Abstract
An electrical lead includes an elongate body having a proximal end portion and a distal end portion, a first electrode disposed adjacent and joined to the distal end portion of the elongate body, and a first conductor extending between the proximal end portion and the distal end portion of the elongate body and being electrically coupled to the first electrode. The medical electrical lead further comprises a second electrode disposed adjacent the first electrode and joined to the elongate body and a capacitive device electrically coupled to the first conductor and the second electrode.
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Citations
21 Claims
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1. An electrical lead, comprising:
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an elongate body having a proximal end portion and a distal end portion;
a first electrode joined to the distal end portion of the elongate body;
a first conductor extending within the elongate body between the proximal end portion and the distal end portion and being electrically coupled to the first electrode;
a second electrode disposed adjacent the first electrode and joined to the elongate body;
a second conductor extending within the elongate body between the proximal end portion and the distal end portion and being electrically coupled to the second electrode; and
a capacitive device electrically coupling the first conductor to the second electrode within the elongate body;
wherein the first electrode serves as a cathode and the second electrode serves as an anode for bipolar pacing and sensing of body tissue; and
the capacitive device has an electrical impedance substantially less than an electrical impedance of the body tissue at signal frequencies associated with MRI and diathermy and has an electrical impedance substantially greater than an electrical impedance of the body tissue at signal frequencies used for pacing and sensing. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A medical device, comprising:
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a control unit;
an elongate body having a proximal end portion coupled with the control unit and a distal end portion;
a first electrode joined to the distal end portion of the elongate body;
a first conductor extending within the elongate body between the proximal end portion and the distal end portion and being electrically coupled to the first electrode and the control unit;
a second electrode disposed adjacent the first electrode and joined to the elongate body;
a second conductor extending within the elongate body between the proximal end portion and the distal end portion and being electrically coupled to the second electrode; and
a capacitive device electrically coupling the first conductor to the second electrode within the elongate body;
wherein the first electrode serves as a cathode and the second electrode serves as an anode for bipolar pacing and sensing of body tissue; and
the capacitive device has an electrical impedance substantially less than an electrical impedance of the body tissue at signal frequencies associated with MRI and diathermy and has an electrical impedance substantially greater than an electrical impedance of the body tissue at signal frequencies used for pacing and sensing. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An electrical lead, comprising:
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an elongate body having a proximal end portion and a distal end portion;
no more than two electrode surfaces joined the elongate body and including a first electrode surface disposed along the distal end portion and a second electrode surface disposed adjacent the first electrode surface and forming a part of a shunting assembly;
a conductor extending within the elongate body between the proximal end portion and the distal end portion and being electrically coupled to the first electrode surface; and
a capacitive device electrically coupling the conductor to the second electrode surface within the elongate body and forming another part of the shunting assembly;
wherein the first electrode surface serves as a cathode for pacing and sensing of body tissue; and
the capacitive device has an electrical impedance substantially less than an electrical impedance of the body tissue at higher signal frequencies associated with MRI and diathermy and has an electrical impedance substantially greater than an electrical impedance of the body tissue at lower signal frequencies used for pacing and sensing so that only the higher frequency signals are conducted to the second electrode surface. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification