Heart monitor and defibrillator device

• US 4,576,170 A
• Filed: 07/09/1980
• Issued: 03/18/1986
• Est. Priority Date: 07/09/1980
• Status: Expired due to Term

• Current Assignee: Cardiac Science Operating Company (Cardica Incorporated)
• Original Assignee: Micro-Circuits Company
• Inventors: Bradley, Robert F., Bradley, Lindell P.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US06/167,382
• Time in Patent Office: 2,078 Days
• Field of Search: 128/419 D, 128/639, 128/640, 128/798, 128/802, 128/702, 128/704, 128/705, 128/706
• US Class Current: 607/27
• CPC Class Codes: A61B 5/282 Holders for multiple electrodes for introduction into the body A61B5/287
• CPC Class Codes: A61N 1/046 Specially adapted for shock therapy, e.g. defibrillation
• CPC Class Codes: A61N 1/048 Electrodes characterised by a specific connection between lead and electrode
• CPC Class Codes: A61N 1/0492 Patch electrodes A61N1/0412, A61N1/0428 take precedence
• CPC Class Codes: A61N 1/3904 External heart defibrillators [EHD]
• CPC Class Codes: A61N 1/3925 Monitoring; Protecting

Abstract

A heart monitor and defibrillator device, which can be worn by high risk patients with only minimal interference with normal daily activities, in which one pocket-size unit contains a heart monitor and microprocessor and a second pocket-size unit contains defibrillation circuitry. ECG electrodes are attached to the patient to sense heart impulses and transmit the impulses to the first unit, which analyzes the heart beat and determines if defibrillation is required. The second unit administers the defibrillating shock when required and has a built-in delay so that the wearer is warned to prepare for defibrillation. Several defibrillation shocks may be administered at spaced intervals. The defibrillation electrodes include layers of electrically conductive, skin adhering paint having low contact resistance, and the electrodes may be moved by the patient to prevent skin irritation in the electrode site.

Claims

1. A heart monitor and defibrillator device for continuously monitoring heart functions and automatically administering defibrillating shock charges, comprising sensing electrodes for continuously detecting heart impulses, amplification means for intensifying and sorting the heart impulses detected by said sensing electrodes, microprocessor means receiving the impulses from said amplification means for analyzing the impulses and determining when a defibrillation shock charge is required, defibrillation circuitry controlled by said microprocessor means having automatic recharge capabilities, a delay means for discharging a defbrillation charge a short time after the necessity of defibrillation is detected by said microprocessor means, warning means for notifying the patient before a defibrillation shock charge is administered, and defibrillator electrodes to be attached to the patient'"'"'s chest for administering the defibrillation shock charge to the patient'"'"'s heart.

2. A heart monitor and defibrillator device as defined in claim 1 in which a first housing surrounds said amplification means and said microprocessor means, and a second housing surrounds said defibrillation circuitry.

3. A heart monitor and defibrillator device as defined in claim 1 in which said warning means includes a light emitting diode.

4. A heart monitor and defibrillator device as defined in claim 1 in which said warning means includes an earplug for conveying a signal to the patient.

5. A heart monitor and defibrillator device as defined in claim 1 in which said defibrillator electrodes include a layer of skin adhering electrically conductive paint, wire mesh in low resistance contact with said paint layer, securing means for holding said wire mesh in electrical contact with said paint layer, and connecting means for conducting a defibrillation shock charge from said defibrillation circuitry to said wire mesh.

6. A heart monitor and defibrillator device as defined in claim 5 in which said securing means is a second layer of electrically conductive paint disposed on said wire mesh and bonded to said first paint layer to encapsulate said mesh.

7. A heart monitor and defibrillator device as defined in claim 5 in which said securing means is a plurality of adhesive strips.

8. A heart monitor and defibrillator device as defined in claim 7 in which said defibrillation circuitry includes a battery means for supplying electrical energy, a plurality of capacitors for holding a dischargeable shock charge of cardioverting potential, a four-pole double-throw relay having contacts electrically connected to said capacitors to place said capacitors in parallel connection for charging from said battery means and to change the connection of said capacitors to series connection for discharge of a shock charge of cardioverting potential, a triggering capacitor for said relay, circuit means connecting said battery means and said triggering capacitor through said microprocessor means for charging said capacitor when said circuit means is closed by said microprocessor means, a resistor in said circuit means between said battery means and said triggering capacitor, and an electrical connection from said triggering capacitor to said relay having a Zener diode therein.

9. A heart monitor and defibrillator device as defined in claim 1 in which said defibrillation circuitry includes a battery means connected thereto for supplying electrical energy, storage means for holding a dischargeable shock charge of cardioverting potential, and triggering means for releasing said shock of cardioverting potential.

10. A heart monitor and defibrillator device as defined in claim 9 in which said storage means includes a plurality of capacitors connected in parallel arrangement for charging by said battery means, and a relay for switching said capacitors to a series connection by said triggering means for release of a shock charge of cardioverting potential.

11. A heart monitor and defibrillator device as defined in claim 10 in which said triggering means includes a capacitor charged by said battery means when said microprocessor means closes a connection therebetween, a four-pole double-throw relay having a contact for each of said capacitors of said plurality of capacitors, one position of said contacts being for parallel connection of said capacitors of said plurality of capacitors, the other position of said contacts being for series connection of said capacitors of said plurality of capacitors, and a Zener diode disposed in an electrical connection between said relay and said triggering means capacitor.

12. A heart monitor and defibrillator device as defined in claim 11 in which said delay means includes a resistor in electrical connection between said battery means and said triggering means capacitor.

13. In a heart defibrillator:

a defibrillation circuit comprising at least one electrode for delivering an electric charge to a patient, a sensor for detecting heart impulses and creating a signal therefrom, a battery means for supplying electrical energy, a storage means for holding a charge of cardioverting potential including a plurality of capacitors charged by said battery means, a four-pole double-throw relay having contacts connected to said capacitors to place said capacitors in parallel connection for charging from said battery means and to change the connection of said capacitors to series connection for the discharge of a defibrillation charge, a triggering means for said relay, and means responsive to abnormalities in said heart impulse signals for activating said triggering means to actuate said relay to change the connection of said capacitors into a series connection when the electric charge is to be transmitted to said electrode.

14. In a defibrillator:

a defibrillation circuit as defined in claim 13 in which said triggering means includes a capacitor, circuit means for connecting said battery means to said triggering capacitor only when defibrillation is required, a connection from said capacitor of said triggering means to said relay, and a Zener diode disposed in said connection between said relay and said capacitor of said triggering means.

15. In a defibrillator:

a defibrillation circuit as defined in claim 14 in which a resistor is disposed in said circuit means between said battery means and said capacitor of said triggering means.