Cardiac pacing/sensing lead providing far-field signal rejection
a technology of far-field signal rejection and cardiac pacing, which is applied in the field of implantable, transvenous, far-field signal rejection, bipolar cardiac pacing and sensing leads, can solve the problems of undetectable diameter increase, inability to suppress far-field electrical signals, and inability to activate certain pacing schemes or therapies. erroneously triggered activation of certain pacing schemes or therapies, etc., to achieve the effect of low forward voltage drop and small form factor
Inactive Publication Date: 2008-02-21
PACESETTER INC
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AI Technical Summary
Benefits of technology
The solution significantly attenuates R-wave far-field signals while maintaining clinically acceptable P-wave signal amplitudes, preventing oversensing and ensuring accurate cardiac signal detection without compromising pacing thresholds or device features like autocapture and morphology discrimination.
Problems solved by technology
One of the problems with cardiac pacing and sensing systems is their inability to suppress far-field electrical signals.
When far-field signal voltages greater than the threshold voltage are applied to the sensed signal processing circuitry of the pulse generator or pacemaker, activation of certain pacing schemes or therapies can be erroneously triggered.
However, the added ring electrode has required an additional electrical conductor within the lead body, tending to undesirably increase the diameter of the lead.
Method used
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Embodiment Construction
[0023] The following description is not to be taken in a limiting sense but is made merely for the purpose of describing the general principles of the illustrated embodiments. The scope of the invention should be ascertained with reference to the issued claims. In the description that follows, like numerals or reference designators are used to refer to like parts or elements throughout.
[0024]FIG. 1 depicts, in diagrammatic form, the anterior portion of a human heart 10, specifically showing the superior vena cava (SVC) 12; the right atrium (RA) 14; the right ventricle (RV) 16; and the apex 18 of the RV.
[0025]FIG. 1 shows, by way of example and not limitation, a bipolar, active fixation, pacing and sensing lead 30 in accordance with the invention placed within the RV 16. The lead 30 is electrically connected to an implantable medical device 34 which may comprise a pacemaker or a pacemaker combined with cardioverting and / or defibrillating functions. The lead 30 is shown by way of ex...
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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.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional of copending U.S. patent application Ser. No. 11 / 112,508, filed Apr. 21, 2005, titled “Cardiac Pacing / Sensing Lead Providing Far-Field Signal Rejection” (Atty. Docket A05P1034).FIELD OF THE INVENTION [0002] The present invention relates generally to cardiac pacing and sensing, and particularly to an implantable, transvenous, far-field signal-rejecting, bipolar cardiac pacing and sensing lead and to a system incorporating such a lead. BACKGROUND OF THE INVENTION [0003] Cardiac pacemaker lead systems fulfill two functions. The first function is to provide an electrical conduit by which a pacemaker output pulse is delivered to stimulate the local tissue adjacent to the distal tip of the lead. The second function is to sense local, intrinsic cardiac electrical activity that takes place adjacent to the distal tip of the lead. [0004] The advantages of providing pacing therapies to both the right and left heart...
Claims
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IPC IPC(8): A61N1/05
CPCA61N1/056A61N1/3704A61N1/3702A61N1/0573
Inventor KROLL, MARK W.HELLAND, JOHN R.
Owner PACESETTER INC