Respiratory therapy apparatus and methods
A vibratory respiratory therapy device ( 100 ) has a valve element ( 11 ) on a rocker arm ( 12 ) that opens and closes an opening ( 10 ) during exhalation through the device and thereby generates sound. A mobile phone ( 20 ) with a microphone ( 21 ) picks up the sound generated and has a processor ( 22 ) that converts the sound signal into a sound energy signal in order to measure its frequency. The processor ( 22 ) computes a measure of pressure in the device ( 10 ) by multiplying the detected frequency by a fixed factor and adding a fixed constant to the product. The pressure data is used to monitor patient use of the device.
1 . Respiratory therapy apparatus including a device arranged to provide an alternating resistance to respiratory flow through the device and a sensor unit arranged to sense sound made by the device in response to expiration breathing from a user into the device, wherein the sensor unit comprises a processor arranged to compute a measure of pressure created in the device by converting the sound sensed by the sensor unit into a sound energy signal having a frequency, and by multiplying the frequency by a fixed factor to provide a product and adding to the product a fixed constant to compute the measure of pressure, wherein the computed measure of pressure is compared with preprogrammed pressure values stored in the processor representative of target values and limits appropriate for the user, and wherein the measure of pressure is displayed on a screen so that the user is made aware of how well the user is doing with the user's expiration breathing into the device and whether the user needs to modify the user's expiration breathing to achieve maximum benefit from the use of the device.
2 . The respiratory therapy apparatus according to claim 1 , wherein the fixed factor is about 1.119.
3 . The respiratory therapy apparatus according to claim 1 , wherein the fixed constant is about −4.659.
4 . The respiratory therapy apparatus according to claim 1 , wherein the sensor unit includes a microphone responsive to audible sound.
5 . The respiratory therapy apparatus according to claim 1 , wherein the device includes a valve element on a rocker arm that opens and closes an opening during exhalation through the device to generate the sound sensed by the sensor unit.
6 . The respiratory therapy apparatus according to claim 1 , wherein the sensor unit is not mounted on the device but is separate from the device.
7 . The respiratory therapy apparatus according to claim 6 , wherein the sensor unit is provided by a mobile phone including a microphone and a screen, and that the processor is also provided by the mobile phone.
8 . A sensor unit arranged to sense sound made by a respiratory therapy device, wherein the sensor unit includes a processor arranged to compute a measure of pressure created in the device by converting the sound sensed by the sensor unit into a sound energy signal having a frequency and to use the frequency of the sound energy signal to compute the measure of pressure in the device.
9 . The sensor unit according to claim 8 , wherein the sound is generated by the device providing an alternating resistance to respiratory flow through the device.
10 . A method of evaluating use of a respiratory therapy device arranged to produce an oscillating resistance to breathing through the device, the method comprising:
utilizing a sensor unit for sensing sound within the device due to pressure in the device caused by expiration breathing from a user into the device;
utilizing a processor working cooperatively with the sensor unit for converting the sound sensed by the sensor unit into a sound energy signal having a frequency, and calculating a measure of the pressure within the device from the frequency of the sound energy signal;
comparing the computed measure of pressure with preprogrammed pressure values stored in the processor representative of target values and limits appropriate for the user;
displaying the measure of pressure to the user so that the user is made aware of how well the user is doing with the user's expiration breathing and whether the user needs to modify the user's expiration breathing to achieve maximum benefit from the use of the device.
11 . The method according to claim 10 , wherein the measure of the pressure is computed by multiplying the frequency by a fixed factor and adding to the product a fixed constant.
12 . The method according to claim 11 , wherein the fixed factor is about 1.119 and the fixed constant is about −4.659.