×

Process for switching the inspiration or expiration phase during CPAP therapy

  • US 6,318,365 B1
  • Filed: 09/07/1999
  • Issued: 11/20/2001
  • Est. Priority Date: 02/17/1997
  • Status: Expired due to Fees
First Claim
Patent Images

1. A method for changing to the inhalation or exhalation phase (TI and TE, respectively) with a CPAP device, during a CPAP therapy of a patient, the steps comprising:

  • differentiating a respiratory gas flow (V) from and to the patient with respect to time;

    changing to a respective breathing phase (i.e. inhalation or exhalation) wherein after changing to a respective breathing phase;

    comparing a first derivative (dV/dt) of the gas flow (V) with a first, high threshold value (HSE, HSI)and then a second, low threshold (NSE, NSI) for a variation of the first threshold;

    changing to a respective other breathing phase occurs when the first derivative has reached the second threshold value (NSE, NSI);

    comparing the first derivative with the second, low threshold value (NSE) in the exhalation phase;

    sampling a time history of the respiratory gas flow (V) in a sequence of at least three sampling values (X1, X2 X3);

    changing to the inhalation phase at X3 if the following two conditions

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×