Respiratory effort detection method and apparatus

US5944680A · kind A · utility

Assignee

• Medtronic, Inc. · US

Inventors

• Mark A. Christopherson · Golden Valley, US
• Johann J. Neisz · Coon Rapids, US
• John Hammargren · Sandviken, SE

Key dates

• Filing date: Jun 26, 1996
• Grant date: Aug 31, 1999
• Expiry date: Jun 26, 2016

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61N1/3601
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method of predicting critical points in patient respiration includes monitoring at least one characteristic of a respiratory effort waveform of a patient to detect a respiratory event. A refractory period is defined that includes a hard refractory period during which time the respiratory event cannot be responded to and a soft refractory period following the hard refractory period. The respiratory event outside of the refractory period is detected as a function of a first set of predetermined parameters for the monitored at least one characteristic and the respiratory event within the soft refractory period is detected as a function of a second set of predetermined parameters for the monitored at least one characteristic. The respiratory event may be inspiration onset and the characteristic of the respiratory effort waveform monitored is at least one of slope and amplitude. The refractory period may be defined based on detection of inspiration offset and further may be defined based on inspiration offset, an average respiratory period, and an average time of inspiration. Further, stimulation may be provided in response to a detected inspiration onset. Another method of predicting…