Surgery – Truss – Pad
Patent
1974-11-15
1976-07-06
Michell, Robert W.
Surgery
Truss
Pad
128188, A61M 1600
Patent
active
039676196
ABSTRACT:
An apparatus and method for intermittent mandatory ventilation therapy utilizing a connecting device to interconnect an intermittent source of pressurized air, a less pressurized continuous source of air, and the respiratory system of a patient. The connecting device has a one-way bleed valve by which, in cooperation with other one-way valves, air from the continuous air source is prevented from entering an expiration tube through which the patient exhales. The bleed valve is placed in the supply tube from the continuous air source to "bleed off" to the surrounding atmosphere the supply of continuous air during patient expiration, thereby permitting a second one-way valve, also in the supply tube from the continuous air source, to close. By bleeding off the continuous air source during patient expiration, air pressure in the supply tube is prevented from overcoming the expiration pressure and forcing its way past the second one-way valve and into the patient's expiration tube, thereby ensuring that only patient exhalation enters the expiration tube. This allows the volumetric air flow through the expiration tube to be measured as a direct indication of the volumetric breathing rate of the patient. In addition, the one-way bleed valve prevents the introduction of air from the atmosphere into the supply tube from the continuous air source should the patient's inspirational demand momentarily exceed the output of the continuous air source. The connecting device mounts all one-way valves closely proximate the connection to the patient's respiratory system to minimize the amount of dead space in which the patient can exhale, and thereby minimizes the amount of exhalation that the patient can inhale during the succeeding inspiration. A second embodiment, aside from locating all valves still closer to the patient's connection, includes an additional one-way valve in the inspiration tube connecting the intermittent air source to the patient to prevent exhalation from entering the inspiration tube.
REFERENCES:
patent: 3046979 (1962-07-01), Andreasen
patent: 3741208 (1973-06-01), Jonsson et al.
patent: 3865106 (1975-02-01), Palush
Downs et al., Intermittent Mandatory Ventilation: A New Approach to Weaning Patients from Mechanical Ventilators; Mar. 26, 1972, Department of Anesthesiology, University of Florida College of Medicine.
Desautels et al., Respiratory Care, Mar., 1974, vol. 19, No. 3, pp. 187-191, Methods of Administering Intermittent Mandatory Ventilation (IMV).
Liskey Jerald L.
Story Eddie W.
Michell Robert W.
Recla Henry J.
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