Device for determining an opening pressure in the lungs

Details Device for determining an opening pressure in the lungs Device for determining an opening pressure in the lungs

1995-02-13

1996-11-19

Millin, V.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820418, A61M 1600

Patent

active

055752837

ABSTRACT:
Most alveoli could collapse in different illnesses and injuries to a lung. A relatively high positive pressure, which could in itself damage the lung or impede its healing, is required to open the alveoli. A positive pressure is often applied at the end of the expiratory phase in order to keep the alveoli open throughout entire respiratory cycles. A ventilator is disclosed wherein an opening pressure for the lung can be determined from measurement values for the pressure and the volume of air supplied to the lung. The ventilator registers the measurement values and determines the opening pressure from the relationship between measurement values for pressure and for volume. The determined opening pressure can then be used by a physician for setting an appropriate end expiratory pressure (PEEP) for the respiratory phase or be used by a control unit in the ventilator for automatic setting of an appropriate end expiratory pressure.

REFERENCES:
patent: 4036221 (1977-07-01), Hillsman et al.
patent: 4323064 (1982-04-01), Hoenig et al.
patent: 4587967 (1986-05-01), Chu et al.
patent: 4957107 (1990-09-01), Sipin
patent: 5400777 (1995-03-01), Olsson et al.
"Open Up the Lung and Keep the Lung Open," Lachmann, Intensive Care Med., vol. 18, (1992), pp. 319-321.
"Mechanical Ventilation, Slutsky, ACCP Concensus Conference," Chest vol. 104 (1993), pp. 1833-1859.

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