The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 20, 1981
Filed:
Oct. 24, 1979
James T Bartelt, Shoreview, MN (US);
Cardiac Pacemakers, Inc., St. Paul, MN (US);
Abstract
A hand-held, portable, battery-powered test instrument for evaluating the performance of cardiac pacer devices prior to the implantation thereof and afterwards. To test R-wave sensitivity of a pacer device, a series of simulated R-waves, each of a predetermined greater amplitude, is applied to the pacer unit under test, each such simulated R-wave occurring at a time following a preceding pacer pulse sufficient to ensure that the pacer's refractory period has elapsed. This process is continued until a succeeding pacer pulse does not occur at the time it would otherwise be due, thus indicating that the R-wave had just reached the amplitude sufficient to cause the resetting of the pacer pulse generator. A count is maintained of the number of cycles needed to cause resetting of the pacer pulse generator and this value is displayed to indicate, in terms of voltage, the minimum amplitude of the R-wave just sufficient to result in pacer resetting.