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Improved Endotracheal Tube for Reduced Viscous and Inertial Friction Disclosure Number: IPCOM000201137D
Publication Date: 2010-Nov-09
Document File: 2 page(s) / 192K

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Improved Endotracheal Tube for Reduced Viscous and Inertial Friction

During many respiratory diseases, which are summarized under the designation Acute Respiratory Distress Syndrome, or ARDS, controlled mechanical ventilation of patients is a life saving technique.

During ARDS, the surface of lung tissue available for gas exchange is reduced as well as the elasticity of the tissue.

To administer adequate amounts of oxygen, higher pressures as compared to physiologic conditions are required.

However, if the upper limit of a ventilator’s pressure is reached, the patient will not survive. Therefore, it is of paramount importance to avoid any medications or technical appliances which further increase the force that the ventilator has to provide.

One of the most important “bottlenecks” in the ventilator-patient system is the endotracheal tube.

This is the reason why it is a real need to improve and optimize the design of endotracheal tubes. 

Generally speaking, endotracheal tubes are used in medical intubation procedures with mechanical ventilators as a pathway to the respiratory tract as shown in the Figure below.

Thus, they add to the total inertial and viscous friction that the ventilator must overcome on inhalation and that the recoil of the lung must overcome on expiration. 

Actually, in many cases, the endotracheal tube is the largest single component of the frictional loss as represented in the Figure below, which shows the pressure changes from the ventilator Y-pi...