Implantable demand pacemaker and monitor

• US 4,187,854 A
• Filed: 10/17/1977
• Issued: 02/12/1980
• Est. Priority Date: 10/17/1977
• Status: Expired due to Term

• Current Assignee: Medtronic Incorporated (Medtronic Plc)
• Original Assignee: Medtronic Incorporated (Medtronic Plc)
• Inventors: Citron, Paul, Hepp, Dennis G., Neumann, Robert A.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US05/842,389
• Time in Patent Office: 848 Days
• Field of Search: 128/2.06 A, 128/2.06 F, 128/2.06 R, 128/2.1 A, 128/419 PG, 128/419 PS, 128/419 PT, 128/419 E
• US Class Current: 607/33
• CPC Class Codes: A61B 5/0006 ECG or EEG signals
• CPC Class Codes: A61B 5/0031 Implanted circuitry
• CPC Class Codes: A61B 5/7203 for noise prevention, reduction or removal
• CPC Class Codes: A61N 1/3625 External stimulators
• CPC Class Codes: A61N 1/3706 Pacemaker parameters stimulation threshold A61N1/371
• CPC Class Codes: A61N 1/37211 Means for communicating with stimulators

Abstract

Cardiac monitoring and pacing apparatus comprising a first external unit for transmitting electromagnetic energy within the patient'"'"'s body to be received by a second, surgically implanted unit within the patient'"'"'s body and adapted to be solely powered by the transmitted electromagnetic energy. The first external unit transmits electromagnetic energy within the patient'"'"'s body which is sensed and used to power the implanted unit, which stimulates, via pacing electrodes, the patient'"'"'s heart. The internal unit also includes a monitoring circuit connected to the same pacing electrodes coupled to the patient'"'"'s heart, for providing atrial and ventrical signals to be pulse-width modulated for transmission to the external unit. The external unit decodes the transmitted signals to provide diagnostic quality signals indicative of the patient'"'"'s EKG.

Claims