Exhalation valve of breathing machine

Abstract

The invention discloses an exhalation valve of a breathing machine. The exhalation valve comprises a cavity body and a diaphragm arranged in the cavity body, wherein the surface at one side of the diaphragm encloses a pressure buffer cavity communicated with an air source with the cavity body, and the surface at the other side of the diaphragm encloses an exhaled air buffer cavity used for accommodating air exhaled by a patient with the cavity body. When the diaphragm is at a first position, the exhaled air buffer cavity is not communicated with the outside, and when the diaphragm is at a second position, the exhaled air buffer cavity is communicated with the outside. The exhalation valve also comprises an air supplement pipe used for supplementing air into the exhaled air buffer cavity, wherein one end of the air supplement pipe is communicated with the air source, while the other end is communicated with the exhaled air buffer cavity. The invention abandons a conventional method, and does not pay attention to the point on how to reduce exhaled air leakage, but looks for another way to adopt the air supplement method; and pressure lost by the leakage is supplemented, which thoroughly avoids the reduction of the pressure of the exhaled air, thus the purpose of maintaining the positive end expiratory pressure constant is truly achieved.

Description

technical field [0001] The invention relates to an exhalation valve of a ventilator. Background technique [0002] A ventilator is a medical device used to support the breathing of patients with insufficient breathing capacity. For example, it is usually used as part of an anesthesia machine to anesthetize the patient during surgery and to perform passive breathing on the anesthetized patient. The exhalation valve is an important part of the ventilator. Its function is to control the air pressure of the patient's exhaled gas to keep it above atmospheric pressure. In this way, when the patient exhales, the lungs can also maintain a certain pressure, thereby maintaining a certain filling degree of the alveoli, increasing the surface area of ​​the alveoli, and thereby increasing the gas exchange capacity of the alveoli. This effect is important in patients with certain lung diseases. [0003] attached figure 1 It is a structural schematic diagram of the exhalation valve of t...

AI Technical Summary

Problems solved by technology

Existing products can only minimize leakage, but cannot completely eliminate leakage, and cannot maintain positive end-expiratory pressure stably at the same value

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