IP Library › Granted Patent US 12,357,221
Granted Patent B2
US 12,357,221 · App. 18/404,427 · Granted Jul 15, 2025

Implantable cardioverter-defibrillator (ICD) tachyarrhythmia detection modifications responsive to detected pacing

Inventors: Robert W. Stadler (Shoreview, MN); Xusheng Zhang (Shoreview, MN); Vinod Sharma (Maple Grove, MN); James D. Reinke (Maple Grove, MN); Barbara J. Schmid (Forest Lake, MN)
Assignee: Medtronic, Inc.
A61B5/363A61B5/346A61B5/686A61N1/3621A61N1/37264A61N1/37288A61N1/3756A61N1/3962A61N1/39622A61N1/3987
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Quick Facts
Patent No.
US 12,357,221
App. No.
18/404,427
Granted
Jul 15, 2025
Kind
B2
Abstract

An implantable medical device comprises a sensing module configured to obtain electrical signals from one or more electrodes and a control module configured to process the electrical signals from the sensing module in accordance with a tachyarrhythmia detection algorithm to monitor for a tachyarrhythmia. The control module detects initiation of a pacing train delivered by a second implantable medical device, determines a type of the detected pacing train, and modifies the tachyarrhythmia detection algorithm based on the type of the detected pacing train.

Claims (78)

1. A first device comprising a control module configured to:

detect a pacing train delivered by a second device;

modify a tachyarrhythmia detection algorithm from a first tachyarrhythmia detection mode to a second tachyarrhythmia detection mode based on detecting the pacing train, wherein modifying the tachyarrhythmia detection algorithm includes:

switching from controlling a therapy module of the first device according to the first tachyarrhythmia detection mode to controlling the therapy module according to the second tachyarrhythmia detection mode;

determine whether the pacing train is concluded;

in response to determining that the pacing train is concluded:

modify the tachyarrhythmia detection algorithm from the second tachyarrhythmia detection mode to the first tachyarrhythmia detection mode; and

switch from controlling the therapy module according to the second tachyarrhythmia detection mode to controlling the therapy module according to the first tachyarrhythmia detection mode.

2. The first device of claim 1 , wherein the control module is further configured to:

determine that the pacing train represents an anti-tachycardia pacing (ATP) train delivered by the second device; and

determine to modify the tachyarrhythmia detection algorithm based on determining that the pacing train represents an ATP train.

3. The first device of claim 1 ,

wherein to determine to modify the tachyarrhythmia detection algorithm from the first tachyarrhythmia detection mode to the second tachyarrhythmia detection mode based on detecting the pacing train, the control module is further configured to:

determine a heart rate of a patient;

determine whether the heart rate of the patient is greater than a heart rate threshold;

determine to modify the tachyarrhythmia detection algorithm from the first tachyarrhythmia detection mode to the second tachyarrhythmia detection mode in response to the heart rate being greater than the heart rate threshold; and

determine to maintain the tachyarrhythmia detection algorithm in the first tachyarrhythmia detection mode in response to the heart rate not being greater than the heart rate threshold.

4. The first device of claim 1 , wherein the therapy module includes one or more defibrillation capacitors, and wherein to switch from controlling the therapy module according to the first tachyarrhythmia detection mode to controlling the therapy delivery circuitry according to the second tachyarrhythmia detection mode, the control module is configured to cause the one or more defibrillation capacitors to charge so that a voltage corresponding to the one or more defibrillation capacitors increases from a first voltage to a second voltage.

5. The first device of claim 4 , wherein the control module is further configured to:

detect an arrhythmia requiring electrical stimulation therapy; and

cause the one or more defibrillation capacitors to discharge to deliver a defibrillation shock to the patient.

6. The first device of claim 1 , further comprising a sensing module, wherein the control module is configured to:

receive a sensor signal from the sensing module, wherein the sensor signal includes a cardiac signal indicating cardiac activity of a patient; and

detect the pacing train based on the sensor signal, wherein the pacing train is separate from the cardiac signal of the sensor signal.

7. The first device of claim 6 , wherein to modify the tachyarrhythmia detection algorithm from the first tachyarrhythmia detection mode to the second tachyarrhythmia detection mode, the control module is configured to ignore a segment of the cardiac signal corresponding to a period of time during which the pacing train occurs.

8. The first device of claim 1 ,

wherein to detect the pacing train, the control module is configured to detect a sequence of pacing pulses, and

wherein to determine whether the pacing train is concluded, the control module is configured to:

determine that the pacing train is concluded in response to an amount of time since detecting a most recent pacing pulse of the sequence of pacing pulses being more than a threshold amount of time; and

determine that the pacing train is not concluded in response to the amount of time since detecting the most recent pacing pulse of the sequence of pacing pulses being not more than the threshold amount of time.

9. The first device of claim 1 , wherein to determine whether the pacing train is concluded, the control module is configured to:

determine that the pacing train is concluded in response to an amount of time since detecting a start of the pacing train being more than a threshold amount of time; and

determine that the pacing train is not concluded in response to the amount of time since detecting the start of the pacing train not being more than the threshold amount of time.

10. The first device of claim 1 , wherein the first tachyarrhythmia detection mode involves analyzing a morphology of a cardiac signal, and

wherein the second tachyarrhythmia detection mode involves ignoring a cardiac signal without analyzing a morphology of the cardiac signal.

11. A method comprising:

detecting, by a control module of a first device, a pacing train delivered by a second device;

modifying, by the control module, a tachyarrhythmia detection algorithm from a first tachyarrhythmia detection mode to a second tachyarrhythmia detection mode based on detecting the pacing train, wherein modifying the tachyarrhythmia detection algorithm includes:

switching from controlling a therapy module of the first device according to the first tachyarrhythmia detection mode to controlling the therapy module according to the second tachyarrhythmia detection mode;

determining, by the control module, whether the pacing train is concluded;

in response to determining that the pacing train is concluded:

modifying the tachyarrhythmia detection algorithm from the second tachyarrhythmia detection mode to the first tachyarrhythmia detection mode; and

switching from controlling the therapy module according to the second tachyarrhythmia detection mode to controlling the therapy module according to the first tachyarrhythmia detection mode.

12. The method of claim 11 , further comprising:

determining, by the control module, that the pacing train represents an anti-tachycardia pacing (ATP) train delivered by the second device; and

determining, by the control module, to modify the tachyarrhythmia detection algorithm based on determining that the pacing train represents an ATP train.

13. The method of claim 11 ,

wherein determining to modify the tachyarrhythmia detection algorithm from the first tachyarrhythmia detection mode to the second tachyarrhythmia detection mode based on detecting the pacing train comprises:

determining, by the control module, a heart rate of a patient;

determining, by the control module, whether the heart rate of the patient is greater than a heart rate threshold;

determining, by the control module, to modify the tachyarrhythmia detection algorithm from the first tachyarrhythmia detection mode to the second tachyarrhythmia detection mode in response to the heart rate being greater than the heart rate threshold; and

determining, by the control module, to maintain the tachyarrhythmia detection algorithm in the first tachyarrhythmia detection mode in response to the heart rate not being greater than the heart rate threshold.

14. The method of claim 11 , wherein switching from controlling the therapy module according to the first tachyarrhythmia detection mode to controlling the therapy delivery circuitry according to the second tachyarrhythmia detection mode comprises causing, by the control module, one or more defibrillation capacitors of a therapy module of the first device to charge so that a voltage corresponding to the one or more defibrillation capacitors increases from a first voltage to a second voltage.

15. The method of claim 14 , further comprising:

detecting, by the control module, an arrhythmia requiring electrical stimulation therapy; and

causing, by the control module, the one or more defibrillation capacitors to discharge to deliver a defibrillation shock to the patient.

16. The method of claim 11 , further comprising:

receiving, by the control module, a sensor signal from a sensing module of the first device, wherein the sensor signal includes a cardiac signal indicating cardiac activity of a patient; and

detecting, by the control module, the pacing train based on the sensor signal, wherein the pacing train is separate from the cardiac signal of the sensor signal.

17. The method of claim 16 , wherein modifying the tachyarrhythmia detection algorithm from the first tachyarrhythmia detection mode to the second tachyarrhythmia detection mode comprises ignoring, by the control module, a segment of the cardiac signal corresponding to a period of time during which the pacing train occurs.

18. The method of claim 11 ,

wherein detecting the pacing train comprises detecting, by the control module, a sequence of pacing pulses, and

wherein determining whether the pacing train is concluded comprises:

determining, by the control module, that the pacing train is concluded in response to an amount of time since detecting a most recent pacing pulse of the sequence of pacing pulses being more than a threshold amount of time; and

determining, by the control module, that the pacing train is not concluded in response to the amount of time since detecting the most recent pacing pulse of the sequence of pacing pulses being not more than the threshold amount of time.

19. The method of claim 11 , wherein determining whether the pacing train is concluded comprises:

determining, by the control module, that the pacing train is concluded in response to an amount of time since detecting a start of the pacing train being more than a threshold amount of time; and

determining, by the control module, that the pacing train is not concluded in response to the amount of time since detecting the start of the pacing train not being more than the threshold amount of time.

20. A system comprising:

a first device comprising a control module configured to:

detect a pacing train delivered by a second device;

modify a tachyarrhythmia detection algorithm from a first tachyarrhythmia detection mode to a second tachyarrhythmia detection mode based on detecting the pacing train, wherein modifying the tachyarrhythmia detection algorithm includes:

switching from controlling a therapy module of the first device according to the first tachyarrhythmia detection mode to controlling the therapy module according to the second tachyarrhythmia detection mode;

determine whether the pacing train is concluded;

in response to determining that the pacing train is concluded:

modify the tachyarrhythmia detection algorithm from the second tachyarrhythmia detection mode to the first tachyarrhythmia detection mode; and

switch from controlling the therapy module according to the second tachyarrhythmia detection mode to controlling the therapy module according to the first tachyarrhythmia detection mode; and

the second device.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 4, 2024
From: STADLER, ROBERT W.; ZHANG, XUSHENG; SHARMA, VINOD; REINKE, JAMES D.; SCHMID, BARBARA J.
To: MEDTRONIC, INC.
Reel/Frame 066022/0687 →
Continuity (5)
Continuation 17001424 · Aug 24, 2020
Continuation 16221921 · Dec 17, 2018
Continuation 14687010 · Apr 15, 2015
Provisional Application 61984214 · Apr 25, 2014
Related Publication 20240148307A1 · May 9, 2024
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