Continuous positive airway pressure therapy device

Details Continuous positive airway pressure therapy device Continuous positive airway pressure therapy device

1999-08-24

2001-07-03

Weiss, John G. (Department: 3761)

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

C128S204250

Reexamination Certificate

active

06253766

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates in general to respiratory therapy devices and, in particular, to a continuous positive airway pressure therapy device which maintains continuous positive pressure to a patient's lungs through the use of a flow amplifier for maintaining the positive pressure during a patient's inspiration, breath pause and expiration portions of the breathing cycle.
More specifically, but without restriction to the particular embodiment and/or use which is shown and described herein for purposes of illustration, this invention relates to a continuous positive airway pressure therapy device having a flow amplifying body and which is adapted for connection to a source of compressed air or oxygen to generate a positive airway pressure during inhalation, breath pause and exhalation.
2. Description of Related Art
Devices for maintaining or inducing a constant positive pressure within the airway passages of a patient are generally incorporated into breathing machine systems such as an anesthesia machine or respirators. Accordingly, such equipment is complicated, moderately cumbersome and expensive. While continuous positive airway pressure has been utilized for many forms of respiratory therapy, such as the treatment of pulmonary edema (cardiogenic and noncardiogenic), acute hypoaxaemic respiratory failure, thoracic trauma, asthma, chronic obstructive airway disease, pneumonitides, atelectasis and sleep apnoea, the availability of a simple, inexpensive and reliable continuous flow device would increase the therapeutic modality of this form of therapy. It would, therefore, be desirable to have such a continuous positive airway pressure device which would be capable of delivering a positive pressure to a patient's respiratory system throughout the patient's inspiratory and expiratory cycle, while minimizing the work of breathing created by the device.
The present invention provides such a device with the use of a nominal compressed gas source by utilizing a Coanda profile and an internal orifice to create a high velocity turbulent flow from the compressed gas source that effectively entrains ambient air flowing towards the patient thereby creating a positive airway pressure. This positive airway pressure amplifies the flow of ambient air to a patient during inhalation, maintains the positive pressure during breath pause while the flow of compressed gas is no longer directed towards the patient, and, upon expiration, the compressed gas flow is overcome by the patient's expiratory air flow while still providing positive airway pressure.
SUMMARY OF THE INVENTION
It is an object of this invention to improve continuous positive airway pressure therapy devices.
Another object of this invention is to provide a single patient use continuous positive airway pressure therapy device.
Still another object of this invention is to provide a continuous positive airway pressure therapy device which utilizes a compressed gas to generate positive airway pressure during patient inhalation, breath pause and exhalation.
Yet another object of this invention is to provide a continuous positive airway pressure therapy device which generates a positive airway pressure during a patient's inhalation, breath pause and exhalation by introducing a compressed gas through a ring orifice which effectively amplifies gas/air flow by drawing ambient air into the device.
These and other objects are attained in accordance with the present invention wherein there is provided an improved continuous positive airway pressure therapy device including a ring orifice through which compressed air or oxygen is introduced to effectively amplify the air flow to the patient by drawing ambient air into the device inlet for maintaining a continuous positive pressure of a patient's lungs during all portions of the breathing cycle.


REFERENCES:
patent: 4261355 (1981-04-01), Glazener
Exair—Amplifiers, Exair Corp.
Infant Flow System Coanda Effect, E.M.E. Electro Medical Equipment.
Aladdin Infant Flow System, Hamilton Medical.
C.P.A.P. “T”, E.L. Glazener.
Evaluation & Clinical Application of a New CPAP Device, Apr. 28, 1980, ASA Abstracts.
Equipment A New Continuous Positive Airway Pressure (CPAP) Device by K. Hillman & C. Huggins, May 1991, Anesthesia & Intensive Care, vol. 19, No. 2.
Tests of Six Continuous Flow CPAP Devices by Y. Shehabi et al. May 1991, Anesthesia & Intensive Care, vol. 19, No. 2.
Description & clinical evaluation of a new continuous positive airway pressure device by Barry G. Zamost et al. Feb. 1981, Critical Care Medicine vol. 9, No. 2.

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