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EP0350282A2
Expired / Lapsed
EP
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Pacemaker catheter
Assignee: Cardiac Control Systems Inc
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Filing: 1989-07-04
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Granted: —
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Expires: 2009-07-04
Abstract
Abstract An optimum placement, shape and orientation of catheter electrodes in a cardiac pacemaker system takes advantage of the peak-positive to peak-negative summative effect of a diphasic depolarization wave front of the P wave necessary to the beating of a heart. Electrode surface ar as are maintained in tha 4 to 6mm² range and disposed so as to minimize signal attenuation from gradient averaging of the depolarizing signature and also to minimize the effect of uncontrollable angular rotation of the catheter.
Inventors
- 👤 Robert R. Brownlee
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 19:54
CPC Classifications
A; A61; A61N; A61N1/00; A61N1/02; A61N1/04; A61N1/05; A61N1/056; A61N1/0565
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
295 words
A catheter (40) for a cardiac pacemaker system having a cardiac pacer for insertion into a patient's heart (30), said catheter comprising: a single, non-diverging, insulated filament (44) for insertion into the patient's heart (30) through the patient's vascular system, said filament having a distal end, a proximate end, and a proximal portion between said distal and proximate ends; first electrode means (50) disposed at said distal end of said filament for sensing and pacing the heartbeat of the ventricle (35) of the patient's heart (30) and connectible to a pulse generating unit in said pacer for receiving a stimulating electrical pulse therefrom in response to input signals so as too pace the ventricle (35) of the patient's heart (30); second and third electrode means (46, 56; 48, 58; 56′; 56˝; 58′; 58˝) disposed on said proximal portion of said filament (44) and spaced from said first electrode means (50) for sensing atrial depolarizations having a particular signature indicative of the extracellular wave forms associated with the intracellular action potential in the atrium of the patient's heart; electrical conductor means (44) within said insulated filament for connecting said first, second and third electrode means (50; 46, 56; 56′; 56˝; 48, 58; 58′; 58˝) to the cardiac pacer; and tuning means (47, 57; 57′; D3) for adapting said second and third electrode means (46, 56; 48, 58; 56′, 56˝; 58′; 58˝) to sense and detect the particular signature indicative of the extracellular potential, as defined by the peak negative to peak positive deflection, being propagated along the surface of the atrium of the patient's heart (30), whereby said second and third electrode means (46, 48; 56; 56′; 56˝; 58′; 58˝) in use transmit said input signals indicative of a heart beat p-wave to the cardiac pacer.
Claim 2
Dependent Claim
295 words
A catheter (40) for a cardiac pacemaker system having a cardiac pacer for insertion into a patient's heart (30), said catheter comprising: a single, non-diverging, insulated filament (44) for insertion into the patient's heart (30) through the patient's vascular system, said filament having a distal end, a proximate end, and a proximal portion between said distal and proximate ends; first electrode means (50) disposed at said distal end of said filament for sensing and pacing the heartbeat of the ventricle (35) of the patient's heart (30) and connectible to a pulse generating unit in said pacer for receiving a stimulating electrical pulse therefrom in response to input signals so as too pace the ventricle (35) of the patient's heart (30); second and third electrode means (46, 56; 48, 58; 56′; 56˝; 58′; 58˝) disposed on said proximal portion of said filament (44) and spaced from said first electrode means (50) for sensing atrial depolarizations having a particular signature indicative of the extracellular wave forms associated with the intracellular action potential in the atrium of the patient's heart; electrical conductor means (44) within said insulated filament for connecting said first, second and third electrode means (50; 46, 56; 56′; 56˝; 48, 58; 58′; 58˝) to the cardiac pacer; and tuning means (47, 57; 57′; D3) for adapting said second and third electrode means (46, 56; 48, 58; 56′, 56˝; 58′; 58˝) to sense and detect the particular signature indicative of the extracellular potential, as defined by the peak negative to peak positive deflection, being propagated along the surface of the atrium of the patient's heart (30), whereby said second and third electrode means (46, 48; 56; 56′; 56˝; 58′; 58˝) in use transmit said input signals indicative of a heart beat p-wave to the cardiac pacer.
Claim 3
Dependent Claim
46 words
The catheter according to claim 1, wherein said tuning means further adapts said second and third electrode means to provide signal addition of the extracellular bioelectric wave front corresponding to the particular signature of the action potential travelling in the tissue medium of the patient's heart.
Claim 4
Dependent Claim
55 words
The catheter according to claim 1 or 2, wherein said tuning means comprises an insulating filament (47, 57, 57′) separating said two sensing electrodes having a length substantially equal to the length of the peak-negative to peak-positive deflection of the detected extracellular signature associated with the action potential in the atrium of the patient's heart.
Claim 5
Dependent Claim
46 words
The catheter according to any preceding claim, wherein said second and third electrode means comprise electrodes having dimensions adapted to minimize field averaging of a bioelectric wave front corresponding to the particular signature of the action potential travelling in the tissue medium of the patient's heart.
Claim 6
Dependent Claim
39 words
The catheter according to any preceding claim, wherein the surface area of each of said second and third electrodes exposed to the potential transmitting tissue medium is from substantially 3mm² to substantially 7mm², preferably substantially 4mm² to substantially 6mm².
Claim 7
Dependent Claim
52 words
The catheter according to claim 4 or 5, wherein said electrodes further comprise hemicyclical electrodes disposed either on the opposite sides, or on the same side, of said catheter filament and separated by said insulated filament having a length of from about 1mm to about 6mm, preferably substantially 2mm to about 3mm.
Claim 8
Dependent Claim
23 words
The catheter according to any of claims 1 to 5, wherein said electrodes further coµprise ring electrodes extending circumferentially around said insulated filament.
Claim 9
Dependent Claim
32 words
The catheter according to claim 7, wherein said ring electrodes are separated by said insulated filament having a length of from substantially 1mm to substantially 6mm, preferably substantially 2mm to substantially 3mm.
Claim 10
Dependent Claim
18 words
The catheter according to claim 6, wherein said hemicyclical electrodes extend substantially one-half circumference around said catheter filament.
Claim 11
Dependent Claim
53 words
The catheter according to claim 6, 7 or 9, wherein said electrodes are separated by said insulated filament (47, 57, 57′) having a length of substantially 4mm to substantially 5mm for use in patients with aging cardiac muscle tissue whereby signal subtraction of the extracellular potential associated with the action potential is minimised.
References Cited (Backward Citations)
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