Delay to therapy following patient controlled atrial shock therapy request

• US 6,618,617 B2
• Filed: 04/20/2001
• Issued: 09/09/2003
• Est. Priority Date: 04/20/2001
• Status: Expired due to Term

• Current Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Original Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Inventors: Favet, Michael L., Ricci, Carlos, Propp, Hal, Seim, Gary T., Chen, Victor T.
• Primary Examiner(s): Layno, Carl
• Application Number:
  US09/839,123
• Publication Number:
  US 20020156505A1
• Time in Patent Office: 872 Days
• Field of Search: 607/4, 607/5, 607/14
• US Class Current: 607/5
• CPC Class Codes: A61N 1/3956 Implantable devices for applying electric shocks to the heart, e.g. for cardioversion

Abstract

An implantable cardiac device detects a patient therapy request originating from external to the implantable device. A shock therapy delay period is timed in response to the detection of the patient therapy request. Atrial shock therapy is provided to the patient after expiration of the shock therapy delay period (if the presence of an ongoing atrial arrhythmia is detected). The patient therapy request may be provided by a patient activator including a magnet for operating a reed switch in the implanted device to provide the request. A patient activator including an input and receiver/transmitter circuitry may be employed to request the immediate providing of atrial shock therapy, and/or to set the duration of the shock therapy delay period. By allowing specific delays to therapy after a therapy request, a patient can prepare for the requested therapy and thereby mitigate therapy discomfort.

Claims

1. An implantable patient controllable atrial shock therapy device, comprising:

(a) an atrial arrhythmia detector for detecting an atrial arrhythmia of the patient;

(b) an atrial cardioverter for providing atrial shock therapy to a heart of the patient to terminate a detected atrial arrhythmia of the patient;

(c) patient therapy request detection means for detecting an external patient therapy request active for a time duration greater than a selected therapy request signal duration, wherein the patient therapy request detection means is responsive to the external patient therapy request to provide the patient therapy request; and

(d) shock therapy control means for timing a shock therapy delay period in response to detection of the patient therapy request and for controlling the atrial cardioverter to provide atrial shock therapy after expiration of the shock therapy delay period.

2. The implantable patient controllable atrial shock therapy device of claim 1 wherein the atrial arrhythmia detector includes means for detecting atrial arrhythmias selected from the group of atrial arrhythmias consisting of atrial tachycardia and atrial fibrillation and wherein the atrial cardioverter includes means for providing atrial shock therapy selected from the group of atrial shock therapies consisting of atrial antitachycardia pacing and atrial defibrillation shock therapy.

3. The implantable patient controllable atrial shock therapy device of claim 1 wherein the patient therapy request detection means includes a reed switch responsive to a magnetic field to operate the reed switch to provide the patient therapy request.

4. The implantable patient controllable atrial shock therapy device of claim 3 wherein the patient therapy request detection means is responsive to a magnetic field operating the reed switch.

5. The implantable patient controllable atrial shock therapy device of claim 1 wherein the patient therapy request detection means includes a receiver for receiving a telemetered patient therapy request originating external to the implantable device.

6. The implantable patient controllable atrial shock therapy device of claim 1 wherein the shock therapy delay period is a programmable delay period.

7. The implantable patient controllable atrial shock therapy device of claim 6 comprising a receiver means for receiving a shock therapy delay period setting command from external to the implantable device and wherein the shock therapy control means is responsive to the shock therapy delay period setting command to set the shock therapy delay period.

8. The device of claim 1, wherein the selected therapy request signal duration is programmable.

9. The device of claim 1, wherein the device further comprises tone generator circuitry, wherein the tone generator circuitry provides at least one audible tone when the patient therapy request detection means detects a patient therapy request.

10. An implantable patient controllable atrial shock therapy device, comprising:

(a) an atrial arrhythmia detector for detecting an atrial arrhythmia of the patient;

(b) an atrial cardioverter for providing atrial shock therapy to a heart of the patient to terminate a detected atrial arrhythmia of the patient;

(c) a receiver for receiving a patient therapy request signal and a patient therapy delay request signal originating from external to the implantable device; and

(d) shock therapy control means for timing a shock therapy delay period in response to receipt of the patient therapy delay request signal and for controlling the atrial cardioverter to provide atrial shock therapy after expiration of the shock therapy delay period, and for controlling the atrial cardioverter to provide atrial shock therapy without timing a shock therapy delay period in response to receipt of the patient therapy request signal.

11. The implantable patient controllable atrial shock therapy device of claim 10 wherein the atrial arrhythmia detector includes means for detecting atrial arrhythmias selected from the group of atrial arrhythmias consisting of atrial tachycardia and atrial fibrillation and wherein the atrial cardioverter includes means for providing atrial shock therapy selected from the group of atrial shock therapies consisting of atrial antitachycardia pacing and atrial defibrillation shock therapy.

12. The implantable patient controllable atrial shock therapy device of claim 10 wherein the shock therapy delay period is a programmable delay period.

13. The implantable patient controllable atrial shock therapy device of claim 12 wherein the receiver is adapted to receive a shock therapy delay period setting command from external to the implantable device and wherein the shock therapy control means is responsive to the shock therapy delay period setting command to set the shock therapy delay period.

14. A method for controlling an implantable atrial shock therapy device, comprising the steps of:

(a) detecting an atrial arrhythmia with the implantable device;

(b) detecting a patient therapy request originating from external to the implantable device for a time greater than a selected therapy request signal duration;

(c) timing a shock therapy delay period in response to detection of the patient therapy request; and

(d) providing atrial shock therapy with the implantable device after expiration of the shock therapy delay period to terminate a detected atrial arrhythmia.

15. The method of claim 14 wherein the step of detecting an atrial arrhythmia includes the step of detecting atrial arrhythmias selected from the group of atrial arrhythmias consisting of atrial tachycardia and atrial fibrillation and wherein the step of providing atrial shock therapy includes the step of providing an atrial shock therapy appropriate for the atrial arrhythmia detected and selected from the group of atrial shock therapies consisting of atrial antitachycardia pacing and atrial defibrillation shock therapy.

16. The method of claim 14 wherein the step of detecting a patient therapy request originating from external to the implantable device includes the step of detecting a presence of a magnetic near the implanted device.

17. The method of claim 14 wherein the step of detecting a patient therapy request originating from external to the implantable device includes the step of receiving a telemetered patient therapy request originating external to the implantable device.

18. The method of claim 14 wherein the shock therapy delay period is a programmable delay period.

19. The method of claim 18 comprising additionally the steps of receiving a shock therapy delay period setting command from external to the implantable device and setting the shock therapy delay period in response to the received shock therapy delay period setting command.

20. A method for controlling an implantable atrial shock therapy device, comprising the steps of:

(a) detecting an atrial arrhythmia with the implantable device;

(b) receiving patient therapy request signals and patient therapy delay request signals originating from external to the implantable device;

(c) timing a shock therapy delay period in response to receipt of a patient therapy delay request signal;

(d) providing atrial shock therapy if an atrial arrhythmia is detected after expiration of the shock therapy delay period; and

(e) providing atrial shock therapy if an atrial arrhythmia is detected without timing a shock therapy delay period in response to receipt of a patient therapy request signal.

21. The method of claim 20 wherein the step of detecting an atrial arrhythmia includes the step of detecting atrial arrhythmias selected from the group of atrial arrhythmias consisting of atrial tachycardia and atrial fibrillation and wherein the steps of providing atrial shock therapy include the steps of providing an atrial shock therapy appropriate for the atrial arrhythmia detected and selected from the group of atrial shock therapies consisting of atrial antitachycardia pacing and atrial defibrillation shock therapy.

22. The method of claim 20 wherein the shock therapy delay period is a programmable delay period.

23. The method of claim 22 comprising additionally the steps of receiving a shock therapy delay period setting command from external to the implantable device and setting the shock therapy delay period in response to the shock therapy delay period setting command.

24. An implantable patient controllable atrial shock therapy device, comprising:

(a) an atrial arrhythmia detector for detecting an atrial arrhythmia of the patient;

(b) an atrial cardioverter for providing atrial shock therapy to a heart of the patient to terminate a detected atrial arrhythmia of the patient;

(c) patient therapy request detection means for detecting a patient therapy request originating from external to the implantable device, wherein the detection means includes a reed switch responsive to a magnetic field operating the reed switch for a time duration greater than a selected therapy request signal duration to provide the patient therapy request;

(d) shock therapy control means for timing a shock therapy delay period in response to detection of the patient therapy request and for controlling the atrial cardioverter to provide atrial shock therapy after expiration of the shock therapy delay period.

25. The implantable patient controllable atrial shock therapy device of claim 24 wherein the atrial arrhythmia detector includes means for detecting atrial arrhythmias selected from the group of atrial arrhythmias consisting of atrial tachycardia and atrial fibrillation and wherein the atrial cardioverter includes means for providing atrial shock therapy selected from the group of atrial shock therapies consisting of atrial antitachycardia pacing and atrial defibrillation shock therapy.

26. The device of claim 24 wherein the device further comprises tone generator circuitry, wherein the tone generator circuitry provides at least one audible tone when a magnetic field operating the reed switch for a time duration greater than the selected therapy request signal duration indicates a patient therapy request.

27. A method for controlling an implantable atrial shock therapy device, comprising the steps of:

(a) detecting an atrial arrhythmia with the implantable device;

(b) detecting a patient therapy request originating from external to the implantable device by detecting a presence of a magnet near the implanted device for a time greater than a selected therapy request signal duration;

(c) timing a shock therapy delay period in response to detection of the patient therapy request; and

(d) providing atrial shock therapy with the implantable device after expiration of the shock therapy delay period to terminate a detected atrial arrhythmia.

28. The method of claim 27 wherein the step of detecting an atrial arrhythmia includes the step of detecting atrial arrhythmias selected from the group of atrial arrhythmias consisting of atrial tachycardia and atrial fibrillation and wherein the step of providing atrial shock therapy includes the step of providing an atrial shock therapy appropriate for the atrial arrhythmia detected and selected from the group of atrial shock therapies consisting of atrial antitachycardia pacing and atrial defibrillation shock therapy.

29. The method of claim 27, wherein the method further includes providing at least one audible tone upon detection of a patient therapy request.

30. A system comprising:

an implantable patient controllable atrial shock therapy device, wherein the device includes;

(a) an atrial arrhythmia detector for detecting an atrial arrhythmia of the patient;

(b) an atrial cardioverter for providing atrial shock therapy to a heart of the patient to terminate a detected atrial arrhythmia of the patient;

(c) patient therapy request detection means for detecting a patient therapy request originating from external to the implantable device, wherein the patient therapy request detection means is responsive to the external patient therapy request for a time duration greater than a selected therapy request signal duration to provide the patient therapy request;

(d) shock therapy control means for timing a shock therapy delay period in response to detection of the patient therapy request and for controlling the atrial cardioverter to provide atrial shock therapy after expiration of the shock therapy delay period; and

(e) receiver/transmitter circuitry including an antenna to implement a telemetry link; and

a patient activator communication device, wherein the device includes;

(a) an input circuit;

(b) receiver/transmitter circuitry including an antenna to implement a telemetry link;

(c) a processor, wherein the processor receives the patient therapy request from the input circuit and transmits the request to the implantable device; and

(d) a display, wherein the display is adaptable to indicate the patient therapy request was received by the implantable patient controllable atrial shock therapy device.

31. The system of claim 30, wherein the implantable patient controllable atrial shock therapy device transmits a confirmation that the patient therapy request was received by the implantable device.

32. The system of claim 30 wherein the patient activator further includes tone generator circuitry, wherein the tone generator circuitry provides at least one audible tone to indicate the patient therapy request was received by the implantable patient controllable atrial shock therapy device.

33. The system of claim 30, wherein the patient therapy request detection means for detecting a patient therapy request originating from external to the implantable device further includes a magnet activated reed switch, and wherein the patient activator communication device further includes a magnet to activate the reed switch to initiate the patient therapy request.

34. The system of claim 30, wherein the implantable device delivers shock therapy immediately upon detecting the patient therapy request originating from external to the implantable device.

35. The system of claim 30, wherein the implantable device withholds shock therapy when the patient therapy request detection means is responsive to the external patient therapy request for a time duration less than the selected therapy request signal duration, and immediately provides shock therapy when a subsequent external patient therapy request causes the patient therapy request detection means to be responsive to the external request for a time duration greater than the selected therapy request signal duration.