A - Human Necessities – 61 – B
Patent
A - Human Necessities
61
B
128/2, 73/8
A61B 5/00 (2006.01) A61M 25/10 (2006.01) A61M 16/04 (2006.01)
Patent
CA 1076831
EXTERNAL PRESSURE-VOLUME MONITOR FOR ENDOTRACHEAL CUFF James O. Elam ABSTRACT A monitoring system is comprised of an elastomer balloon housed in a spherical perforated cage which is designed to continuously indicate the state of collapse or expansion of the internal cuff or cuffs of an endo- tracheal tube. This balloon monitor is interconnected in series with the pneumatic channel through which the cuff or cuffs are inflated. The volume of said monitor- ing balloon may be observed visually with reference to its filling the cage enclosure denoting thereby its state of inflation and therefore, also that of the endo- tracheal cuff. Calibration of the balloon monitor pro- vides means of accurately observing both the volume and pressure of air in the system. Therefore, visual in- spection of the monitor indicates by reason of said calibration the prevailing level of pressure in the patient's endotracheal-tube cuff. Since the maintenance of safe cuff pressures results in a normal position of the balloon, in contact with the cage, electrical and electronic means may be arranged appropriately between the balloon and inner surface of the cage to produce a warning signal in the event of cuff overdistension and an alarm signal in the event of cuff collapse.
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