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:
Feb. 03, 1987
Filed:
Jan. 22, 1985
Robert DeCote, Jr, Miami Beach, FL (US);
Peter P Tarjan, Miami, FL (US);
Cordis Corporation, Miami, FL (US);
Abstract
The sense margin evaluation system and method for use of same is based upon (1) the interposition of a variable broad-band attenuator between an implanted cardiac pacer lead set and a pacer which is about to be implanted and (2) the inclusion of a pacer pulse detector at the pacer port. In use, the pacer is first programmed to a standby mode and a condition of 100% inhibition with the attenuator set to 0 dB. This affirms that the pacer's sense amplifier can sense the cardiac signal. Then, attenuation is incrementally added until the pacer just begins to output. The attenuation ratio (input/output) at this point is a direct measure of the ratio effective between the patient's cardiac signal and the pacer's sensing threshold, i.e., the sense margin. The advantage of this technique is that by using a broad-band attenuator, measurement inaccuracies due to the convolution of the cardiac signal's spectral content with a pacer system analyzer and a pacer sense amplifier's disparate narrow-band frequency response are avoided. The patient's cardiac signal serves as the test waveform generator for the pacer that is about to be implanted in his body and the sense amplifier'frequency response is identically that of the pacer about to be implanted.