Emergency external cardiac defibrillator and pacing method and apparatus

• US 5,593,428 A
• Filed: 09/27/1993
• Issued: 01/14/1997
• Est. Priority Date: 09/27/1993
• Status: Expired due to Fees

• Current Assignee: Khosrow Jimshidi
• Original Assignee: Khosrow Jamshidi
• Inventors: Jamshidi, Khosrow
• Primary Examiner(s): Kamm, William E.
• Assistant Examiner(s): Getzow, Scott M.
• Application Number:
  US08/127,200
• Time in Patent Office: 1,205 Days
• Field of Search: 607/4, 607/122, 607/33, 607/5, 607/115, 607/10
• US Class Current: 607/10
• CPC Class Codes: A61N 1/36017 with leads or electrodes penetrating the skin
• CPC Class Codes: A61N 1/3625 External stimulators
• CPC Class Codes: A61N 1/3904 External heart defibrillators [EHD]

Abstract

An emergency external defibrillator and pacing apparatus for applying electrical stimulation to a heart. The apparatus includes a tubular sleeve having an axial passage therethrough, which is insertable through an incision in a chest cavity to a predetermined depth proximate the heart. A first and second electrode is inserted through the axial passage of the sleeve to contact the surface of the heart. Means are provided for applying an electrical current of preset voltage and time interval to selectively stimulate heartbeat and control rhythm. The apparatus electrodes are inserted through an incision in a chest cavity which is held open by the tubular sleeve.

Claims

1. An emergency external defibrillator and pacing apparatus for applying an electrical current to a heart, said apparatus comprising:

a. a tubular sleeve having an axial passage therethrough, said sleeve insertable through an incision in a chest cavity to a predetermined depth proximate said heart;

b. a first electrode having a first end and second end, said second end having an electrically conductive exposed blunt end;

c. a second electrode having a first end and a second end, said second end having an electrically conductive exposed blunt end, said second end of said first electrode and said second end of said second electrode connected in close proximity to form a single blunt end for insertion through said axial passage of said tubular sleeve proximate said heart;

d. first means for applying an electrical current of selected voltage, said first means connected to the first end of said first electrode; and

e. second means for applying an electrical current of selected voltage, said second means connected to the first end of said second electrode.

2. The emergency external defibrillator and a pacing apparatus of claim 1, wherein said tubular sleeve is constructed from an electrically non-conductive material.

3. The emergency external defibrillator and pacing apparatus of claim 2, wherein said tubular sleeve has a first end and a second end, said first end having a flange thereon with a radial surface generally perpendicular to said axial passage, said radial surface adapted to be in planar contact with the surface of said chest cavity when said tubular sleeve is inserted in said chest cavity.

4. The emergency external defibrillator and pacing apparatus of claim 1, wherein said first means for applying an electrical current includes a manually adjustable voltage regulator.

5. The emergency external defibrillator and pacing apparatus of claim 1, wherein said second means for applying an electrical current includes a manually adjustable voltage regulator.

6. The emergency external defibrillator and pacing apparatus of claim 5, wherein said second means for applying an electrical current includes an adjustable timer for pulsing said electrical current at regular intervals.

7. The emergency external defibrillator and pacing apparatus of claim 6, wherein said adjustable timer can be adjusted between 50 and 80 pulses per minute.

8. A method for defibrillating and pacing a heartbeat of a human heart comprising the steps of:

a. providing an emergency external defibrillator and pacing apparatus which includes,

(1) a tubular sleeve having an axial passage therethrough;

(2) a first electrode having a first end and second end, said second end having an electrically conductive exposed blunt end;

(3) a second electrode having a first end and a second end, said second end having an electrically conductive exposed blunt end, said second end of said first electrode and said second end of said second electrode connected in close proximity to form a single blunt end;

(4) first means for applying an electrical current of selected voltage, said first means connected to the first end of said first electrode; and

(5) second means for applying an electrical current of selected voltage, said second means connected to the first end of said second electrode;

b. making an incision through the skin of the chest wall of a patient proximate said heart;

c. inserting said tubular sleeve through said incision to a predetermined depth proximate said heart, said depth controlled by the length of said tubular sleeve;

d. inserting the second end of said first and second electrodes through the axial passage of said tubular sleeve so that said single blunt end contacts said heart;

e. applying an electrical current to said single blunt end through said first or second electrode to stimulate said heartbeat.

9. The method of claim 8 wherein said electrical current is pulsed at regular intervals through said second electrode to simulate normal heartbeat rhythm.

10. The method of claim 8, wherein the emergency external defibrillator and pacing apparatus provided in accordance with step

a. further includes:

(6) manual means for controlling said first means for applying an electrical current of selected voltage;

and wherein said electrical current application is manually controlled through said first electrode in response to loss of heartbeat.