Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Reexamination Certificate
1999-07-29
2002-09-10
Weiss, John G. (Department: 3761)
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
C128S205240
Reexamination Certificate
active
06446629
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an artificial respiration apparatus and in particular, to an artificial respiration apparatus of high-frequency oscillation type.
The conventional high-frequency oscillation type respiration apparatus includes three pipe routes
605
,
604
and
623
which are connected to a three-way branched pipe
170
having: a patient side opening
171
, oxygen supply opening
172
, and a discharge opening
173
. The patient opening
171
is connected to a patient. The oxygen supply opening
172
is connected to an oxygen supply port. The discharge opening
173
is connected to a discharge exit
607
.
2. Description of the Related Art
FIG. 22
schematically shows a discharge route of a conventional respiration apparatus of high-frequency oscillation.
The conventional high-frequency oscillation type respiration apparatus includes three pipe routes
605
,
604
, and
623
which are connected to a three-way branched pipe
170
having: a patient side opening
171
, oxygen supply opening
172
, and a discharge opening
173
. The patient opening
171
is connected to a patient. The oxygen supply opening
172
is connected to an oxygen supply port. The discharge opening
173
is connected to a discharge exit
807
.
With the aforementioned configuration, oxygen is supplied from the oxygen supply port to the oxygen supply opening
172
in a state urged by oscillating pressure. The oxygen is supplied through the oxygen supply opening
172
to the patient side opening
171
, reaching lungs of a patient P. On the other hand, carbon dioxide (CO
2
) discharged from the lungs of the patient P passes through the patient side opening
171
, the discharge valve
607
into the atmosphere.
Here, as shown in
FIG. 23
, the discharge exit
607
has: a casing
607
a
for introducing a discharge pipe
604
connected to the discharge opening
173
; and a discharge port
607
b
for discharging the carbon dioxide.
However, in the aforementioned conventional apparatus, a negative pressure urging is also carried out so as to discharge carbon dioxide from the lungs of the patient P. Here, the exhaled gas from the patient P is urged into the three-way branched pipe
170
. Simultaneously with this, atmospheric air intrudes from the discharge port
607
b
of the discharge exit as shown in FIG.
24
. This results in reduction of the discharged respiration gas from the patient, i.e., reduction of the gas exchange at one cycle of the oscillating air pressure.
Moreover, in this high-frequency gas exchange, it is difficult, to control pressure inside the pipe route
604
so as to maintain an average in-pipe pressure (almost atmospheric pressure) lower than the conventional intermittent forced ventilation. Simultaneously with this, if an exhaled gas quantity is increased, the lowest value of the average in-pipe pressure is increased.
Moreover, in the conventional high-frequency oscillation type artificial respiration method, the in-pipe pressure between the patient and the discharge end has been maintained lower than the conventional intermittent type artificial respiration apparatus. However, when the average in-pipe pressure is set low such as almost atmospheric pressure, the atmospheric air intrudes from the discharge end, and it is difficult to obtain a target pressure. Simultaneously with this, if an exhaled gas amount is increased the average in-pipe pressure is increased.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an artificial respiration apparatus capable of preventing intrusion of the atmospheric air from the discharge end so as to perform gas exchange more effectively.
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patent: 6230708 (2001-05-01), Radko
Kamada Masahiro
Nitta Kazufuku
Ohtake Tomohisa
Saito Masatake
Sugiura Yasuhito
Greenblum & Bernstein P.L.C.
Mitchell Teena
Suzuki Motor Corporation
Weiss John G.
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