Apnea/hypopnea detection system and method
AssigneeRIC Investments, LLC
InventorsBen Haberland, Uday S Shankar
Life of this patent
Estimating the term…
Abstract
An apnea/hypopnea detection system and method that monitors a patient's respiratory flow, determines (a) a long term RMS energy based on the flow, (b) a long term threshold determined based on the long term RMS energy, and (c) a short term RMS energy based on the flow. Determining whether the patient is experiencing an apnea/hypopnea is accomplished by comparing the short term RMS energy with the long term threshold. This A/H detection technique is useful in diagnosing a patient for a breathing disorder, such as OSA, and/or for controlling an auto-titration pressure support system.
Claims23
An apnea/hypopnea detection system comprising:
- a flow sensor adapted to detect patient respiratory flow;
- and
- processing means for:
- (1) determining (a) a long term RMS energy based on the flow, (b) a long term threshold determined based on the long term RMS energy, and (c) a short term RMS energy based on the flow, (2) determining whether a patient is experiencing an apnea/hypopnea event by comparing the short term RMS energy with the long term threshold, (3) calculating (a) a short term integral of the patient flow, (b) a long term integral of the patient flow, and (c) an absolute difference therebetween, and (4) determining whether a patient is experiencing an apnea/hypopnea event that includes comparing the absolute difference to a differential threshold.
An apnea/hypopnea detection system comprising:
- a flow sensor adapted to detect patient respiratory flow;
- and
- processing means for (1) determining (a) a long term RMS energy based on the flow, (b) a long term threshold determined based on the long term RMS energy, and (c) a short term RMS energy based on the flow, (2) determining whether a patient is experiencing an apnea/hypopnea event by comparing the short term RMS energy with the long term threshold, and (3) determining whether such a patient has ceased experiencing an apnea/hypopnea event that includes calculating an exit threshold that is different from the long term threshold, and comparing the short term RMS energy with the exit threshold.
A method of detecting an apnea/hypopnea comprising:
- monitoring a patient's respiratory flow;
- determining a long term RMS energy based on the flow;
- determining a long term threshold based on the long term RMS energy;
- determining a short term RMS energy based on the flow;
- comparing the short term RMS energy with the long term threshold to determine whether such a patient is experiencing an apnea/hypopnea;
- determining a short term integral of the respiratory flow;
- determining a long term integral of the respiratory flow;
- and
- determines an absolute difference between the short term integral of respiratory flow and the long term integral of respiratory flow;
- and wherein determining whether a patient is experiencing an apnea/hypopnea event includes comparing the absolute difference to a differential threshold.
A method of detecting an apnea/hypopnea comprising:
- monitoring a patient's respiratory flow;
- determining a long term RMS energy based on the flow;
- determining a long term threshold based on the long term RMS energy;
- determining a short term RMS energy based on the flow;
- comparing the short term RMS energy with the long term threshold to determine whether such a patient is experiencing an apnea/hypopnea;
- and
- determining whether such a patient has ceased experiencing an apnea/hypopnea event, wherein determining whether such a patient has ceased experiencing an apnea/hypopnea event comprises calculating an exit threshold and comparing the short term RMS energy with the exit threshold.
Dependencies are inferred from the claim text.