CARDIAC PACING/SENSING LEAD PROVIDING FAR-FIELD SIGNAL REJECTION
First Claim
1. A cardiac lead for transmitting electrical pacing and sensing signals between an electrical medical device and selected cardiac tissue, the lead comprising:
- a lead body having a proximal end, a distal tip and a distal end portion extending proximally from the distal tip, the proximal end of the lead body carrying a connector assembly electrically connectable to the electrical medical device;
a helical screw-in pacing/sensing electrode extendable and retractable relative to the distal tip of the lead body;
a first electrical conductor within the lead body electrically connecting the helical screw-in pacing/sensing electrode to a first electrical contact on the connector assembly;
a collar pacing/sensing electrode carried by the distal end portion of the lead body at the distal tip thereof;
a second electrical conductor within the lead body electrically connecting the collar pacing/sensing electrode to a second electrical contact on the connector assembly;
a ring pacing/sensing electrode carried by the distal end portion of the lead body, the ring pacing/sensing electrode being disposed proximally of the collar pacing/sensing electrode in spaced-apart relationship thereto, the ring pacing/sensing electrode being connected through a switching device to a node point along the second electrical conductor to electrically separate a pacing dipole from a sensing dipole; and
a resistor connected between the node point and the collar pacing/sensing electrode;
wherein pacing is performed between the helical pacing/sensing electrode and the ring pacing/sensing electrode, wherein a pacing signal is applied to the first electrical conductor and hence to the helical pacing/sensing electrode and a return pacing signal flows through the switching device from the ring pacing/sensing electrode and to the second conductor, and wherein the resistor assures that no significant return pacing current is drawn through the collar pacing/sensing electrode; and
wherein sensing is performed between the helical pacing/sensing electrode and the collar pacing/sensing electrode, wherein during sensing the sensing signal passes the resistor from the collar pacing/sensing electrode and to the second electrical conductor, and wherein during sensing the switching device blocks the sensing signal from the ring pacing/sensing electrode.
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Abstract
A proximal end of a lead body carries a connector assembly. A first electrical conductor within the lead body electrically connects a tip electrode to a first electrical contact on the connector assembly. A collar electrode is carried by a distal end portion of the lead body. A second electrical conductor within the lead body electrically connects the collar electrode to a second electrical contact on the connector assembly. A ring electrode, carried by the distal end portion of the lead body, is disposed proximally of the collar electrode in spaced-apart relationship thereto and is connected through a switching device to a node point along the second conductor. The switching device has a first state permitting an electrical current to be conducted between the ring electrode and the node point and a second state in which the ring electrode is electrically isolated from the node point. Preferably, the switching device comprises a diode.
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Citations
20 Claims
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1. A cardiac lead for transmitting electrical pacing and sensing signals between an electrical medical device and selected cardiac tissue, the lead comprising:
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a lead body having a proximal end, a distal tip and a distal end portion extending proximally from the distal tip, the proximal end of the lead body carrying a connector assembly electrically connectable to the electrical medical device;
a helical screw-in pacing/sensing electrode extendable and retractable relative to the distal tip of the lead body;
a first electrical conductor within the lead body electrically connecting the helical screw-in pacing/sensing electrode to a first electrical contact on the connector assembly;
a collar pacing/sensing electrode carried by the distal end portion of the lead body at the distal tip thereof;
a second electrical conductor within the lead body electrically connecting the collar pacing/sensing electrode to a second electrical contact on the connector assembly;
a ring pacing/sensing electrode carried by the distal end portion of the lead body, the ring pacing/sensing electrode being disposed proximally of the collar pacing/sensing electrode in spaced-apart relationship thereto, the ring pacing/sensing electrode being connected through a switching device to a node point along the second electrical conductor to electrically separate a pacing dipole from a sensing dipole; and
a resistor connected between the node point and the collar pacing/sensing electrode;
wherein pacing is performed between the helical pacing/sensing electrode and the ring pacing/sensing electrode, wherein a pacing signal is applied to the first electrical conductor and hence to the helical pacing/sensing electrode and a return pacing signal flows through the switching device from the ring pacing/sensing electrode and to the second conductor, and wherein the resistor assures that no significant return pacing current is drawn through the collar pacing/sensing electrode; and
wherein sensing is performed between the helical pacing/sensing electrode and the collar pacing/sensing electrode, wherein during sensing the sensing signal passes the resistor from the collar pacing/sensing electrode and to the second electrical conductor, and wherein during sensing the switching device blocks the sensing signal from the ring pacing/sensing electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A cardiac lead for transmitting electrical pacing and sensing signals between an electrical medical device and selected cardiac tissue, the lead comprising:
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a lead body having a proximal end, a distal tip and a distal end portion extending proximally from the distal tip, the proximal end of the lead body carrying a connector assembly electrically connectable to the electrical medical device;
a helical screw-in pacing/sensing electrode extendable and retractable relative to the distal tip of the lead body;
a first electrical conductor within the lead body electrically connecting the helical screw-in pacing/sensing electrode to a first electrical contact on the connector assembly;
a collar pacing/sensing electrode carried by the distal end portion of the lead body at the distal tip thereof;
a second electrical conductor within the lead body electrically connecting the collar pacing/sensing electrode to a second electrical contact on the connector assembly;
a ring pacing/sensing electrode carried by the distal end portion of the lead body, the ring pacing/sensing electrode being disposed proximally of the collar pacing/sensing electrode in spaced-apart relationship thereto, the ring pacing/sensing electrode being connected through a switching device to a node point along the second conductor, the switching device having a first state permitting an electrical current to be conducted between the ring pacing/sensing electrode and the node point and a second state in which the ring pacing/sensing electrode is electrically isolated from the node point; and
an electrical resistor disposed between the collar pacing/sensing electrode and the node point. - View Dependent Claims (9, 10, 11, 12)
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13. A cardiac lead for transmitting electrical pacing and sensing signals between an electrical medical device and selected cardiac tissue, the lead comprising:
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a lead body having a proximal end, a distal tip and a distal end portion extending proximally from the distal tip, the proximal end of the lead body carrying a connector assembly electrically connectable to the electrical medical device;
a first pacing/sensing electrode at the distal tip of the lead body;
a first electrical conductor within the lead body electrically connecting the first pacing/sensing electrode to a first electrical contact on the connector assembly;
a second pacing/sensing electrode carried by the distal end portion of the lead body at the distal tip thereof;
a second electrical conductor within the lead body electrically connecting the second electrode to a second electrical contact on the connector assembly;
a third pacing/sensing electrode carried by the distal end portion of the lead body, the third pacing/sensing electrode being disposed proximally of the second electrode in spaced-apart relationship thereto, and a switching device connecting the third electrode to a node point along the second conductor, the switching device having a first state permitting an electrical current to be conducted between the third electrode and the node point and a second state in which the third electrode is electrically isolated from the node point; and
an electrical resistor disposed between the collar electrode and the node point. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification