PORTABLE DEFIBRILLATORS INCLUDING ROTARY SOLENOID RELAYS FOR ENERGY TRANSFER AND DUMPING

• US 3,814,105 A
• Filed: 03/01/1972
• Issued: 06/04/1974
• Est. Priority Date: 03/01/1972
• Status: Expired due to Term

• Current Assignee: Christopher R. Wartes, Jack D. Howard, Stanley V. Seiffert
• Original Assignee: Christopher R. Wartes, Jack D. Howard, Stanley V. Seiffert
• Inventors: Howard, Jack D., Seiffert, Stanley V., Wartes, Christopher R.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US05/230,618
• Time in Patent Office: 825 Days
• Field of Search: 128/419D,419R,421,423 335/114,122,193,26B
• US Class Current: 607/5
• CPC Class Codes: A61N 1/3904 External heart defibrillators [EHD]
• CPC Class Codes: A61N 1/39046 User protection from shock
• CPC Class Codes: A61N 1/3912 Output circuitry therefor, e.g. switches

Abstract

A portable defibrillator including at least one open-frame relay is disclosed. The relay combines the functions of previously-used transfer, dump, and ECG protection relays required in portable defibrillator-ECG monitor units. The relay includes at least one rotary solenoid for providing reliable operation while yet resisting accidental operation due to physical shock or the like.

Claims

1. A portable defibrillator for operation from a source of power, said defibrillator comprising:

1. a source of defibrillation energy;

2. an electrical network means for storing said defibrillation energy;

3. a pair of electrodes engagable with a patient; and

, 4. circuit means for controlling the selective application of said defibrillation energy to said patient via said electrodes, said circuit means including;

a. a first switch;

b. a first relay including a first set of contacts normally connecting said defibrillation energy source to said electrical network means, and a second set of contacts for connecting said electrical network means to said electrodes to selectively apply said stored defibrillation energy to said electrodes, said first relay further including a first rotary solenoid having a shaft rotatable upon energization thereof and means responsive to the rotation of said shaft for sequentially opening said first set of contacts and closing said second set of contacts; and

, c. means interconnecting the source of power, said first switch and said first rotary solenoid to energize said first rotary solenoid upon actuation of said first switch; and

, 5. means for automatically shunting said electrical network means whenever power is removed from said portable defibrillator, said shunting means including;

a. a second relay including a set of contacts, a second rotary solenoid having a shaft rotatable upon energization thereof and means responsive to the rotation of said shaft for opening said set of contacts;

b. a resistance means;

c. means connecting said set of contacts and said resistance means in series across said electrical network means;

d. means for connecting said second rotary solenoid to the source of power; and

, e. a set of contacts forming part of said first switch and connected to said second rotary solenoid for removing power from said second rotary solenoid when said first switch is actuated.

2. an electrical network means for storing said defibrillation energy;

3. a pair of electrodes engagable with a patient;

and,

4. circuit means for controlling the selective application of said defibrillation energy to said patient via said electrodes, said circuit means including:

a. a first switch;

b. a first relay including a first set of contacts normally connecting said defibrillation energy source to said electrical network means, and a second set of contacts for connecting said electrical network means to said electrodes to selectively apply said stored defibrillation energy to said electrodes, said first relay further including a first rotary solenoid having a shaft rotatable upon energization thereof and means responsive to the rotation of said shaft for sequentially opening said first set of contacts and closing said second set of contacts; and

, c. means interconnecting the source of power, said first switch and said first rotary solenoid to energize said first rotary solenoid upon actuation of said first switch; and

,

5. means for automatically shunting said electrical network means whenever power is removed from said portable defibrillator, said shunting means including:

a. a second relay including a set of contacts, a second rotary solenoid having a shaft rotatable upon energization thereof and means responsive to the rotation of said shaft for opening said set of contacts;

b. a resistance means;

c. means connecting said set of contacts and said resistance means in series across said electrical network means;

d. means for connecting said second rotary solenoid to the source of power; and

, e. a set of contacts forming part of said first switch and connected to said second rotary solenoid for removing power from said second rotary solenoid when said first switch is actuated.

6. means for protecting said heart signal monitoring means from receiving any of said defibrillation energy, said protection means comprising:

a. a third set of contacts connected between said heart signal monitoring means and said patient; and

, b. means responsive to the rotation of the shaft of said first rotary solenoid for opening said third set of contacts prior to the closure of said second set of contacts.