Reconfirmation prior to shock for implantable defibrillation

US5191884A · kind A · utility

Assignee

• Telectronic SA · NL

Inventors

• Norma L. Gilli · Mona Vale, AU
• Lorraine Holley · Sydney, AU
• Geoffrey A. Drane · Sydney, AU
• Anthony Clyde Neason Stephens · Chatswood, AU
• Christopher N. Daly · Mona Vale, AU
• Steven M. Maas · Englewood, US

Key dates

• Filing date: Aug 29, 1990
• Grant date: Mar 9, 1993
• Expiry date: Aug 29, 2010

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61N1/3987
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A multiprogrammable, telemetric, implantable defibrillator contains a high energy shock system to revert VT/VF's to normal sinus rhythm and a multi-programmable VVI bradycardia support system. When the apparatus is in an automatic shock sequence, there are two points of reconfirmation: at the programmed minimum time to shock and after the full charge has been reached, or at thirty seconds, whichever comes first. Reconfirmation involves testing the tachycardia detection output (TDO). If the TDO is high, reconfirmation occurs. If the TDO is low, reconfirmation will not occur and the device will subsequently dump the discharge. Two reconfirmations must occur before a shock is delivered to the patient. If the TDO is low at either reconfirmation, the charge will be dumped.