Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Reexamination Certificate
1998-11-04
2001-06-26
Lewis, Aaron J. (Department: 3761)
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
C128S205130, C128S205140, C128S204210, C128S204280
Reexamination Certificate
active
06250302
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a method in connection with a ventilator, the method comprising supplying fresh gas to a patient and supplying part of the patient's breathing gas to the patient with a bellows means. The invention also relates to an arrangement in connection with a ventilator.
In the intensive care of patients an open ventilator is conventionally used. In this type of ventilator air and gas are mixed dynamically by means of control valves during a breathing cycle so that the desired tidal volume and oxygen concentration are achieved. The system is open since the gases used are cheap and can be let to the room air after each exhalation. Thus the ventilator and the gas mixer are alternative embodiments of the same valves.
The anaesthetic gases used in an anaesthesia system are both expensive and harmful to the health if let to the room air. For these reasons semi-closed gas circulation is employed in anaesthesia, i.e. a large part of the exhaled gas is returned to the patient after the removal of carbon dioxide. Continuous fresh gas flow refreshes the gas mixture, and excess gas is delivered to a degasification system through an overflow valve. Prior art anaesthesia systems are characterized in that they comprise a separate gas mixer, a separate ventilator, e.g. a pneumatic ventilator or a mechanical piston ventilator, and that fresh gas flow is continuous.
As such the systems described above work well. Usually both of the above-mentioned systems are used in hospitals, often even parallelly. The problem related to this is that the system in its entirety is complex and expensive since there are no common components or groups of components.
BRIEF SUMMARY OF THE INVENTION
The object of the invention is to provide a compact basic solution which may be used both as an intensive care system and as an anaesthesia system with minor adjustments. This is achieved with the method and arrangement of the invention. The method of the invention is characterized in that fresh gas is supplied to a patient by means of a gas mixer and the fresh gas flow from the gas mixer is occasionally led to drive a bellows means. The arrangement of the invention is characterized in that the means that are arranged to supply fresh gas to the patient comprise a gas mixer and that by using a valve device the fresh gas flow from the mixer is occasionally led to drive the bellows means.
First of all, the invention has the advantage that it allows to combine components of intensive care systems and anaesthesia systems, which simplifies the system considerably with respect to the prior art. Due to its simplicity the system is cheaper to implement than the prior art solutions and also very compact, since the ventilator subsystem is combined with the gas mixer subsystem. A further advantage is that it is economical for the producer of the apparatus to maintain and service systems which have many common components. In addition, the apparatus group can be provided with a structure which is more modular that that of traditional anaesthesia and intensive care ventilators.
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Andrus Sceales Starke & Sawall LLP
Instrumentarium Corp.
Lewis Aaron J.
Weiss Joseph F.
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