COMPLIANCE METER FOR RESPIRATORY THERAPY

Abstract: A respiratory apparatus (10) operable for delivering a breathable gas to the airway of a patient includes a status monitor (24, 26) for determining the status of usage of the unit by the patient and a timer (32) for determining the accumulated time of usage of the unit by the patient.

Description: COMPLIANCE METER FOR RESPIRATORY THERAPY Background of the Invention 1. Field of the Invention The present invention relates to the field of respiratory therapy. More particularly, the invention concerns a respiratory apparatus operable for delivering a breathable gas to the airway of a patient and includes a status monitor for determining the status of usage of the unit by the patient and a timer for determining the accumulated time of usage of the unit by the patient. 2. Description of the Prior Art In the treatment of obstructive sleep apnea, for example, it has been found that the application of pressurized ambient air to the nasal passages of a patient provides a pneumatic splint that maintains the patency of the airway. This type of respiratory therapy can be implemented by a home therapy device having a blower unit, a nasal mask, and a pneumatic hose intercon¬ necting the two. When the patient is ready to retire for the night, the mask is placed in position over the patient's nose and the blower activated to deliver the prescribed therapeutic pressure regimen to the patient's airway. The prescribed therapy may include continuous positive air pressure (CPAP) , intermittent positive air pressure (IPAP) , or a variety of other pressure regimens, depending upon the needs of the patient. As those skilled in the art appreciate, the effec¬ tiveness of an apnea therapy device depends upon its usage. In order to determine usage, some prior art devices have incorporated a timer which indicates accumulated operational time of the device. Such prior art devices, however, do not determine whether the device has actually been used by the patient. Even though the therapy device has been turned on, the patient may not have used the device or the nasal mask may have become dislodged during the sleep session. Summary of the Invention The present invention solves the prior art problems discussed above and provides a distinct advance in the state of the art. More particularly, the present invention determines the accumulated time of actual usage of a respiratory apparatus. The preferred respiratory apparatus includes a gas delivery unit operable for coupling with the airway of a patient in delivering a breathable gas thereto, a status monitor for monitoring a parameter indicative of the status of usage of the delivery unit, and a timer responsive to the status monitor for determining the accumulated time of usage of the delivery unit by the patient. In one embodiment of the invention, the status monitor includes a pressure sensor for sensing the pressure at the nasal mask and the timer includes an hour meter. When the sensed nasal pressure exceeds a predete¬ rmined level indicating that the mask is in place about the patient's nose, the hour meter is activated to register accumulated usage time. Brief Description of the Drawings Figure 1 is a schematic representation of the pre¬ ferred respiratory apparatus; Fig. 2 is an electrical schematic diagram of the compliance circuit of Fig. 1; and Fig. 3 is an electrical schematic of a second embodiment of the preferred compliance circuit. Detailed Description of the Preferred Embodiment Referring initially to Fig. 1, preferred respiratory apparatus 10 includes gas delivery unit 12, and complia¬ nce circuit 14. Gas delivery unit 12 includes pressure supply device 16 and patient connector 18. Pressure supply device is preferably a conventional respiratory therapy device operable for delivering ambient air at a selected pressure such as the COMPANION 318 nasal CPAP system available from Puritan-Bennett of Lenexa, Kansas. The preferred patient connector 18 is known as an ADAM circuit also available from Puritan-Bennett and further includes connection hose 20 and nasal mask 22. Fig. 2 illustrates compliance circuit 14, which includes adjustable pressure switch 24 (P/N MPL-500-P-G- 40 available from Micro Pneumatic Logic Co.), hose 26 pneumatically interconnecting mask 22 and switch 24, and timer circuit 28. Circuit 28 includes capacitor Cl (0.1 uF) , voltage regulator 30 (type 7508), capacitor C2 (0.1 uF) . capacitor C3 (10.0 uF) , resistor Rl (500 Ohms), light emitting diode (LED) , and time meter 32 (P/N T33BM733-DC from ENM Co.). In use, pressure switch 24 is adjusted to close at a pressure level just below that of the CPAP pressure prescribed for the patient. When device 16 is turned on and mask 22 properly fitted, pressure at the prescribed level is delivered to the patient and also delivered by way of hose 26 to switch 24, which closes. In this way, hose 26 and switch 24 present an effective means for sensing the pressure at nasal mask 22, which is a parameter indicative of the status of usage of unit 12 by the patient. More particularly, pressure above the pressure switch setting indicates that the patient is using apparatus 10, and pressure below this setting indicates the status of non-usage. With switch 24 closed, power at 12 VDC (supplied by device 16) is delivered to capacitor Cl and to the input of voltage regulator 30, which supplies a regulated output at +5 VDC to capacitors C2, C3, resistor Rl, and meter 32. With this supply voltage, meter 32 is ac- tivated as is the LED by way of resistor Rl. While activated, meter 32 records accumulated time. If mask 22 becomes dislodged or not properly seated thereby presenting excessive leakage, the pressure inside mask 22 drops substantially below the set point pressure. When this occurs, switch 24 opens to de-energize timer circuit 28 and deactivate meter 32. Fig. 3 illustrates circuit 34 which is a second embodiment of the preferred compliance circuit. The input to this circuit is provided at terminal 36 and is preferably in form of logic signals such as a voltage at +9 VDC during exhalation of a patient and at 1.0 VDC during patient inhalation. Such an input can be pro¬ vided, for example, by a conventional flow transducer placed in connection hose 20 with appropriate interface circuitry to provide the desired logic signals corre¬ sponding to patient exhalation and inhalation. With such an arrangement, air flow through hose 20 provides an indication of whether the patient is respirating, at least in part, through hose 20. The desired input signals could also be provided through other means responsive to patient respiration such as a pressure transducer in mask 22, a current monitor coupled with the blower motor of device 16, a heat sensor in the mask, or a position sensor coupled with a control valve that might be used to control the pressure delivered to the patient. Circuit 34 includes network 38 composed of resistors R2 (IK), R3 (1M) , diode D2 (type 4148) and capacitor C4, inverter network 40, inverter network 42, field effect transistor Tl and meter 32. Networks 40 and 42 include operational amplifiers Al and A2 respectively intercon¬ nected with various resistors as shown in Fig. 3 so that these respective networks function as simple inverters. In the operation of circuit 34, a logic high input at +9 VDC at terminal 36 corresponds to patient ex¬ halation. This input rapidly charges capacitor C4 through resistor R2 and diode D2. Amplifier Al inverts this signal to a logic low input to amplifier A2 which again inverts to provide a logic high output to the gate of transistor TI, which turns on and thereby activates meter 32. When the input at terminal 36 goes low (+1 VDC) during patient inhalation, capacitor C4 discharges slowly through resistor R3. More particularly, the time constant of resistor R3 and capacitor C4 is about 10 seconds which maintains the logic high input to amplifier Al during normal patient inhalation (lasting less than 10 seconds) . The next patient exhalation results in rechar¬ ging of capacitor C4. In this way, the operation of meter 32 is maintained during the entire respiratory cycle of the patient and thereby accurately accumulates the usage time of apparatus 10 by the patient. If the patient removes mask 22, or excessive leaks develop, a subsequent exhalation signal is not provided at terminal 36 to recharge capacitor C4. After 10 seconds, the input voltage to amplifier Al is suf¬ ficiently low so that a logic high output is provided to amplifier A2 which in turn provides a logic low output to the gate of transistor TI which turns off and de-ener¬ gizes meter 32. As those skilled in the art will appreciate, the present invention encompasses many variations in the preferred embodiments described herein. For example, the invention finds utility in the context of CPAP, IPAP, and other pressure regimens. Additionally, a wide variety of inputs can be provided indicative of patient usage of the therapeutic apparatus so that the actual time of usage can be determined. Having thus described the preferred embodiments of the present invention, the following is claimed as new and desired to be secured by Letters Patent:

Claims: CLAIMS; 1. A respiratory apparatus comprising: a gas delivery unit including coupling means for coupling with the airway of a patient and delivery means for delivering a breathable gas thereto during usage of said unit by the patient; status means for sensing a parameter indicative of the status of usage of said unit by the pa- tient; and timer means coupled with said status means and responsive thereto for determining the ac¬ cumulated time of usage of said unit by the patient. 2. The apparatus as set forth in claim 1, said delivery unit including means for delivering said breathable gas under pressure for at least a portion of the patient's respiratory cycle wherein said pressure is sufficient for the treatment of obstructive sleep apnea. 3. The apparatus as set forth in claim 1, said breathable gas including ambient air. 4. The apparatus as set forth in claim 1, said coupling means including means for coupling with the nasal passages of the patient. 5. The apparatus as set forth in claim 1, said delivery unit including means for delivering said breathable gas under a selected pressure for at least a portion of the patient's respiratory cycle. 6. The apparatus as set forth in claim 5, said status means including means for detecting a drop in said selected pressure below a predetermined level, such being indicative of uncoupling of said delivery unit from the patient's airway and thereby indicative of a lack of usage of said unit by the patient. 7. The apparatus as set forth in claim 6, said timer means including a selectively activatable, ac- cumulated time meter and means for activating said meter in the absence of said drop in said selected pressure below a predetermined level. 8. The apparatus as set forth in claim 1, said status means including means for detecting the flow of said gas to the patient and for detecting the occurrence of said flow above a predetermined level, such being indicative of uncoupling of said delivery unit from the patient's airway and thereby indicative of a lack of usage of said unit by the patient. 9. The apparatus as set forth in claim 8, said timer means including a selectively activatable, ac¬ cumulated time meter and means for activating said meter in the absence of said occurrence. 10. The apparatus as set forth in claim 1, said timer means including a selectively activatable, ac¬ cumulated time meter and means for activating said meter during usage of said unit by the patient.

Inventors: DEIGHAN JOSEPH, METZLER PHILIP M, PHILLIPS STEPHEN L, WANBAUGH LINN D, DEIGHAN, JOSEPH, METZLER, PHILIP, M., PHILLIPS, STEPHEN, L., WANBAUGH, LINN, D.
Applicants: PURITAN BENNETT CORP, PURITAN BENNETT CORPORATION
Application year: 1993
Main classification: A61M16
IPC codes: A61J7, A61M16, A61M39, A62B7