Power saving communication for medical devices

• US 9,656,091 B2
• Filed: 07/07/2015
• Issued: 05/23/2017
• Est. Priority Date: 07/11/2014
• Status: Active Grant

• Current Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Original Assignee: Cardiac Pacemakers Incorporated (Boston Scientific Corporation)
• Inventors: Huelskamp, Paul, Maile, Keith R.
• Primary Examiner(s): Carey, Michael
• Application Number:
  US14/793,270
• Publication Number:
  US 20160007873A1
• Time in Patent Office: 686 Days
• Field of Search: 607 32, 607 60, 607 62, 600509, 600527, 600528
• CPC Class Codes: A61B 2560/0209 adapted for power saving
• CPC Class Codes: A61B 2560/0214 of power generation or supply
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/11 Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb for measuring pulse A61B5/02 ;A61B5/1038 takes precedence; motion detection to correct for motion artifacts in physiological signals A61B5/721
• CPC Class Codes: A61B 5/14542 for measuring blood gases A61B5/14551 takes precedence
• CPC Class Codes: A61B 5/349 Detecting specific parameters of the electrocardiograph cycle
• CPC Class Codes: A61B 5/361 Detecting fibrillation
• CPC Class Codes: A61B 5/363 Detecting tachycardia or bradycardia
• CPC Class Codes: A61B 5/366 Detecting abnormal QRS complex, e.g. widening
• CPC Class Codes: A61B 5/686 Permanently implanted devices, e.g. pacemakers, other stimulators, biochips A61B5/6861 takes precedence
• CPC Class Codes: A61B 5/7275 Determining trends in physiological measurement data; Predicting development of a medical condition based on physiological measurements, e.g. determining a risk factor
• CPC Class Codes: A61B 5/7282 Event detection, e.g. detecting unique waveforms indicative of a medical condition A61B5/4094, A61B5/4818, A61B5/349, A61B5/0823 take precedence
• CPC Class Codes: A61B 7/023 for introduction into the body, e.g. into the oesophagus oesophageal ECG probes A61B5/285
• CPC Class Codes: A61N 1/3622 comprising two or more electrodes co-operating with different heart regions
• CPC Class Codes: A61N 1/3625 External stimulators
• CPC Class Codes: A61N 1/3684 for stimulating the heart at multiple sites of the ventricle or the atrium
• CPC Class Codes: A61N 1/36843 Bi-ventricular stimulation
• CPC Class Codes: A61N 1/3708 for power depletion
• CPC Class Codes: A61N 1/37205 : Microstimulators, e.g. implantable through a cannula
• CPC Class Codes: A61N 1/37276 : characterised by means for reducing power consumption during telemetry
• CPC Class Codes: A61N 1/37288 : Communication to several implantable medical devices within one patient
• CPC Class Codes: A61N 1/3756 : Casings with electrodes thereon, e.g. leadless stimulators
• CPC Class Codes: A61N 1/3956 : Implantable devices for applying electric shocks to the heart, e.g. for cardioversion

Abstract

Power saving communication techniques for communicating in a medical device system. One example medical device system may be for delivering electrical stimulation therapy to a heart of a patient, and may include a first implantable medical device implanted in a first chamber of the heart and configured to determine one or more parameters, a medical device physically spaced from and communicatively coupled to the first implantable medical device, the medical device configured to deliver electrical stimulation therapy to the heart of the patient, wherein the first implantable medical device is further configured to: compare a value of a first determined parameter to a first threshold; if the value of the first determined parameter passed the first threshold, communicate a first indication to the medical device; and if the value of the first determined parameter has not passed the first threshold, not communicating the first indication to the medical device.

Claims

1. A method of communicating information from a first medical device to a second medical device, the method comprising:

communicating a first threshold corresponding to a first physiological parameter of a patient from a first medical device to a second medical device, wherein the first medical device comprises a subcutaneous implantable cardioverter-defibrillator (S-ICD) with one or more electrodes configured to be adjacent the heart of the patient and the second medical device comprises a leadless pacemaker (LCP) that is configured to be implanted within the heart of the patient, the first physiological parameter is detected based at least in part on one or more of a cardiac electrical signal, a heart sound, and a motion signal;

monitoring a value of the first physiological parameter of the patient with the second medical device;

determining if the value of the first physiological parameter of the patient has passed the first threshold;

if the value of the first physiological parameter of the patient has passed the first threshold, communicating a first indication from the second medical device to the first medical device; and

if the value of the first physiological parameter of the patient has not passed the first threshold, not communicating the first indication from the second medical device to the first medical device.

2. The method of claim 1, wherein the first indication comprises the value of the first physiological parameter.

3. The method of claim 1, wherein the first physiological parameter corresponds to one of a QRS width, an A-V interval, a V-V interval, and a T-wave amplitude.

4. The method of claim 1, further comprising:

after communicating the first indication from the second medical device to the first medical device, communicating a second threshold corresponding to the first physiological parameter of the patient from the first medical device to the second medical device, wherein the second threshold is different from the first threshold;

monitoring the value of the first physiological parameter of the patient with the second medical device; and

determining if the value of the first physiological parameter of the patient has passed the second threshold;

if the value of the first physiological parameter of the patient has passed the second threshold, communicating a second indication from the second medical device to the first medical device; and

if the value of the first physiological parameter of the patient has not passed the second threshold, not communicating the second indication from the second medical device to the first medical device.

5. The method of claim 4, wherein communicating the second threshold comprises communicating a new first threshold value from the first medical device to the second medical device.

6. The method of claim 4, wherein communicating the second threshold comprises communicating a delta value from the first medical device to the second medical device, wherein the second medical device adds the delta value to the first threshold to arrive at the second threshold.

7. The method of claim 1, further comprising:

communicating another threshold corresponding to a second physiological parameter of a patient from a first medical device to the second medical device;

monitoring a value of the second physiological parameter of the patient with the second medical device; and

determining if the value of the second physiological parameter of the patient has passed the another threshold;

if the value of the second physiological parameter of the patient has passed the another threshold, communicating another indication from the second medical device to the first medical device; and

if the value of the second physiological parameter of the patient has not passed the another threshold, not communicating the another indication from the second medical device to the first medical device.

8. The method of claim 1, further comprising:

after communicating the first indication from the second medical device to the first medical device, communicating an acknowledgement from the first medical device to the second medical device; and

if the second medical device does not receive the acknowledgement from the first medical device within a predetermined period of time, communicating the first indication from the second medical device to the first medical device again.

9. The method of claim 8, wherein the predetermined period of time is between two-hundred fifty milliseconds (250 ms) and one second (1 s).

10. A method of reducing communication transmissions in a medical device system, the method comprising:

monitoring a parameter with an implantable leadless cardiac pacemaker;

with the implantable leadless cardiac pacemaker, comparing the monitored parameter to a first threshold and determining if the value of the monitored parameter has passed the first threshold, the first parameter corresponding to one of a QRS width, an A-V interval, a V-V interval, or a T-wave amplitude;

if the value of the monitored parameter has passed the first threshold, communicating the value of the monitored parameter from the implantable leadless cardiac pacemaker to a subcutaneous implantable cardioverter-defibrillator (S-ICD); and

if the value of the monitored parameter has not passed the first threshold, not communicating the value of the monitored parameter from the implantable leadless cardiac pacemaker to the subcutaneous implantable cardioverter-defibrillator (S-ICD).

11. The method of claim 10, further comprising:

after receiving the value of the monitored parameter at the subcutaneous implantable cardioverter-defibrillator (S-ICD), communicating a second threshold from the subcutaneous implantable cardioverter-defibrillator (S-ICD) to the implantable leadless cardiac pacemaker, wherein the second threshold is different from the first threshold; and

if the value of the monitored parameter has passed the second threshold, communicating the value of the monitored parameter from the implantable leadless cardiac pacemaker to the subcutaneous implantable cardioverter-defibrillator (S-ICD); and

if the value of the monitored parameter has not passed the second threshold, not communicating the value of the monitored parameter from the implantable leadless cardiac pacemaker to the subcutaneous implantable cardioverter-defibrillator (S-ICD).

12. The method of claim 10, further comprising:

after communicating the value of the monitored parameter from the implantable leadless cardiac pacemaker to the subcutaneous implantable cardioverter-defibrillator (S-ICD), communicating an acknowledgement from the subcutaneous implantable cardioverter-defibrillator (S-ICD) to the implantable leadless cardiac pacemaker; and

if the implantable leadless cardiac pacemaker does not receive the acknowledgement from the subcutaneous implantable cardioverter-defibrillator (S-ICD) within a predetermined period of time, communicating the value of the monitored parameter from the implantable leadless cardiac pacemaker to the subcutaneous implantable cardioverter-defibrillator (S-ICD) again.

13. The method of claim 11, wherein the second threshold is further past the first threshold.

14. A method of communicating information from a first medical device to a second medical device, the method comprising:

communicating a first threshold corresponding to a first physiological parameter of a patient from a first medical device to a second medical device, wherein the first medical device comprises a subcutaneous implantable cardioverter-defibrillator (S-ICD) with one or more electrodes configured to be adjacent the heart of the patient and the second medical device comprises a leadless pacemaker (LCP) that is configured to be implanted within the heart of the patient;

monitoring a value of the first physiological parameter of the patient with the second medical device;

determining if the value of the first physiological parameter of the patient has passed the first threshold;

if the value of the first physiological parameter of the patient has passed the first threshold, communicating a first indication from the second medical device to the first medical device;

if the value of the first physiological parameter of the patient has not passed the first threshold, not communicating the first indication from the second medical device to the first medical device;

communicating a second threshold corresponding to the first physiological parameter of the patient from the first medical device to the second medical device, wherein the second threshold is further past the first threshold;

monitoring the value of the first physiological parameter of the patient with the second medical device;

determining if the value of the first physiological parameter of the patient has passed the second threshold;

if the value of the first physiological parameter of the patient has passed the second threshold, communicating a second indication from the second medical device to the first medical device; and

if the value of the first physiological parameter of the patient has not passed the second threshold, not communicating the second indication from the second medical device to the first medical device.

15. The method of claim 14, wherein the first physiological parameter of the patient comprises a heart rate.

16. The method of claim 14, wherein the first physiological parameter of the patient corresponds to one of a QRS width, an A-V interval, a V-V interval, or a T-wave amplitude.

17. The method of claim 14, wherein the second threshold is communicated from the first medical device to the second medical device in response to the first medical device receiving the first indication from the second medical device.