Method for establishing defibrillation threshold for a cardiac defibrillator

US5346506A · kind A · utility

Inventors

• Morton M. Mower · Baltimore, US
• Peng-Sheng Chen · 安丰镇, CN

Key dates

• Filing date: Nov 10, 1992
• Grant date: Sep 13, 1994
• Expiry date: Nov 10, 2012

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61N1/3943
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method of determining a defibrillation threshold for an implantable cardiac defibrillator, based upon determining the 50% probability of reaching the upper limit of vulnerability. The 50% probability of reaching the upper limit of vulnerability at the mid-upslope of the T-wave is found to closely approximate the 50% probability of successful defibrillation used to set the shock energy level of the defibrillator. A delayed up-down algorithm is used to determine the shock strength associated with 50% probability of reaching the upper limit of vulnerability.