United States Patent m
Ramon et al.
[54] LEADLESS MAGNETIC CARDIAC PACEMAKER
[76] Inventors: Ceon Ramon, 3845 NE. 86th St.,
Seattle, Wash. 98115; Gust H. Bardy, 2512 Crestmont West, Seattle, Wash. 98199
[21] Appl. No.: 618,696
[22] Filed: Nov. 27,1990
[51] Int. CI.* A61N2/02
[52] U.S. CI 128/419 PG; 600/14;
600/9
[58] Field of Search 128/419 PG, 419 D, 419 F;
600/9, 13, 14, 15
[56] References Cited
U.S. PATENT DOCUMENTS
3,683,934 8/1972 Bukowiecki et al 128/419 PG
3,893,462 7/1975 Manning 600/13
3.915,151 10/1975 Kraus 600/13
4.056,097 11/1977 Maass 128/419 D
4.723,536 2/1988 Rauscher et al 600/14
USO05170784A
[ii] Patent Number: 5,170,784 [45] Date of Patent: Dec. 15,1992
5,066,272 11/1991 Eaton et al 600/9
FOREIGN PATENT DOCUMENTS
3904254 9/1990 Fed. Rep. of Germany ... 128/419 D
0665918 6/1979 U.S.S.R 600/9
1537276 1/1990 U.S.S.R 600/9
Primary Examiner—Kyle L. Howell
Assistant Examiner—Kennedy J. Schaetzle
Attorney, Agent, or Firm—Thomas R. Vigil
[57] ABSTRACT
The magnetic cardiac pacemaker utilizes bisphasic pulses of mixed frequencies and waveforms that are applied to a field coil to generate magnetic pulses of relatively low intensity (less than 200 Gauss) without the use of leads. The device can be worn externally on the chest near the heart to enable the magnetic field to penetrate the body and control the heart muscle as a non-invasive cardiac pacemaker or it can be inserted subcutaneously as a permanent non-lead system cardiac pacemaker.
22 Claims, 6 Drawing Sheets
