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:
Apr. 25, 1989
Filed:
Apr. 03, 1987
Jonathan M Benson, Oregon City, OR (US);
Laerdal Manufacturing Corp., Portland, OR (US);
Abstract
A pulse delivery control signal is applied to and removed from a master or pulse delivery electronic switch to respectively start and terminate the delivery of a trapezoidal waveform defibrillation pulse from charge storage capacitors to a patient. In one specific embodiment, a transfer charge storage circuit is coupled to a capacitor charging circuit for charging as the charge storage capacitors are charged. A transfer switch interconnects the transfer charge storage circuit to a first field-effect transistor switch. In response to a transfer signal, a transfer voltage signal is delivered from the transfer charge storage circuit, through the transfer switch and to the first field-effect transistor. In response, the first field-signal transistor applied the pulse delivery control signal to the master switch. A second field-effect transistor may be included for operating the master switch together with the first field-effect transistor. Voltage detection and energy selection circuits may be employed for detecting when the charge storage capacitors in the circuit are charged to a desired level and for establishing the level to which the capacitors are charged to thereby control the energy delivered by the defibrillation pulses.