System for delivering mechanical waves

• US 6,408,205 B1
• Filed: 12/06/1999
• Issued: 06/18/2002
• Est. Priority Date: 12/18/1996
• Status: Expired due to Fees

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Weijand, Koen, Renirie, Alexis, Schouten, Vincent
• Primary Examiner(s): Getzow, Scott M.
• Application Number:
  US09/454,966
• Time in Patent Office: 925 Days
• Field of Search: 600/16, 607/4, 607/5, 607/6, 607/7, 607/8
• US Class Current: 607/5
• CPC Class Codes: A61B 2017/00703 correcting for movement of heart, e.g. ECG-triggered
• CPC Class Codes: A61N 1/395 for treating atrial fibrillation
• CPC Class Codes: A61N 1/3956 Implantable devices for applying electric shocks to the heart, e.g. for cardioversion
• CPC Class Codes: A61N 7/00 Ultrasound therapy lithotripsy A61B17/22, A61B17/225; massage using supersonic vibration A61H23/00 ; using ultrasound for introducing media into the body A61M37/0092

Abstract

There is provided an implanted system and method for delivering subsonic mechanical waves to one or more selected patient areas, said areas including the patient'"'"'s heart and/or lungs. The mechanical waves are delivered for the purpose of treating fibrillation or like arrhythmias, for enhancing lung gas exchange, enhancing cardiac muscle fiber relaxation, and enhancing coronary perfusion. Mechanical waves are generated in a frequency range of about 1,100,000 Hz, and preferably 1-50,000 Hz. The waves may be delivered continuously for short or long time periods, or may be controlled in timing either with respect to detected portions of a patient'"'"'s heartbeat signal or in response to a detected event such as fibrillation. In one preferred embodiment, the implantable system includes a defibrillation shock generator and control for responding to a defibrillation event by first delivering a sequence of mechanical waves and then delivering an electrical defibrillation shock. In another embodiment, the system and method treat incipient fibrillation or arrhythmia by delivering mechanical waves of predetermined timing to the patient'"'"'s heart and/or lungs. In a specific embodiment, mechanical waves are delivered through an array of transducers to the patient'"'"'s atrial wall, to treat atrial fibrillation.

Claims

1. An implantable system for delivery of mechanical waves to at least of a part of a patient area comprising the patient'"'"'s heart and lungs, the system comprising:

signal means for generating low frequency electrical signals;

detection means for detecting a patient arrhythmia;

wave means for converting said electrical signals to mechanical waves, and for delivering said mechanical waves to a selected location of said patient area; and

control means for coordinating said wave means to deliver said mechanical waves in response to a said detected arrhythmia.

2. The system as described in claim 1, comprising sensor means for sensing of patient cardiac signals, and wherein said control means has coordinating means for coordinating said delivery of mechanical waves with said sensed signals.

3. The system as described in claim 2, wherein said wave means comprises a lead having a plurality of transducers positioned thereon and connecting means for connecting said electrical signals from said signal means to respective ones of said transducers.

4. The system as described in claim 2, wherein said mechanical wave means has at least one transducer positioned for delivering mechanical waves to the patient'"'"'s lungs.

5. The system as described in claim 2, wherein said mechanical wave means comprises a flexible preshaped lead adapted to be inserted into and placed in proximity to an atrial wall of the patient.

6. The system as described in claim 2, wherein said control means comprises timing means for timing at least some of said mechanical waves to be delivered during the patient'"'"'s atrial relaxation periods.

7. The system as described in claim 2, wherein said control means comprises timing means for timing said mechanical waves to be delivered during the patient'"'"'s atrial diastole periods.

8. The system as described in claim 2, wherein said control means comprises means for delivering coordinated waves continuously over a plurality of successive heart cycles.

9. The system as described in claim 2, further comprising shock means for delivering an electrical defibrillation shock to the patient'"'"'s heart, and synchronizing means for synchronizing delivery of said electrical defibrillation shock with delivered mechanical waves.

10. The system as described in claim 9, wherein said synchronizing means controls delivery of said defibrillation shock after delivery of mechanical waves.

11. The system as described in claim 10, providing memory for storing data corresponding to a plurality of respective treatment routines, and selection means for selecting data for a selected treatment corresponding to a sensed patient cardiac event.

12. The system as described in claim 11, further comprising evaluation means for evaluating sensed patient events, and adjustment means for adjusting at least one of said treatment routines on the basis of said evaluation.