Implantable electric heart defibrillation system with attenuation of the pain resulting from the electric shock

• US 6,167,305 A
• Filed: 04/08/1998
• Issued: 12/26/2000
• Est. Priority Date: 04/08/1997
• Status: Expired due to Term

• Current Assignee: Gino Grassi, Leonardo Cammilli, Massimo Fossi
• Original Assignee: Gino Grassi, Leonardo Cammilli, Massimo Fossi
• Inventors: Grassi, Gino, Cammilli, Leonardo
• Primary Examiner(s): EVANISKO, GEORGE ROBERT
• Application Number:
  US09/057,206
• Time in Patent Office: 993 Days
• Field of Search: 607/3.5, 607/14, 607/46
• US Class Current: 607/5
• CPC Class Codes: A61N 1/36071 Pain
• CPC Class Codes: A61N 1/39624 Pain reduction therapy

Abstract

An implantable electrical heart defibrillation system for both ventricle and atrium is proposed and is characterized in that it acts in a manner such as:

to diagnose the type of arrhythmia within a maximum time of 2 seconds from the onset of the arrhythmia;

to deliver the therapeutic shock by electrodes implanted in the region to be defibrillated no more than 4-5 seconds after the recognition of the arrhythmia, if it is ventricular fibrillation, so that the patient does not loose consciousness;

immediately after the onset of the arrhythmia and before the defibrillation shock is delivered, to prevent the conduction of neural pain signals coming from the region in which the electric shock acts, by nerve stimulation by a catheter inserted in the spinal column, utilizing the gate effect, or by the perfusion of a drug with immediate analgesic effect by an infusion pump and a catheter positioned in the region affected by the pain signals. This system enables defibrillation or conversion to be carried out with the patient conscious and within a sufficiently short time to be able to use low shock energy, and with prevention of the consequent painful shock. This considerably improves the quality of life of the patient who is no longer subject to loss of consciousness during ventricular fibrillation and does not feel the pain during the electric shock.

Claims

1. A method of electrically defibrillating a heart, comprising:

(a) sensing a ventricular fibrillation;

(b) stimulating the spinal column to produce an analgesic effect; and

(c) delivering an electrical shock to defibrillate the heart,

wherein the step of sensing the ventricular fibrillation comprises sensing within 2 seconds from the start of the ventricular fibrillation an electrical signal from the heart having an average frequency of greater than 280 beats per minute and sensing a stoppage of pumping of the heart.