Surgery – Respiratory method or device – Means for supplying respiratory gas under positive pressure
Reexamination Certificate
1999-12-06
2004-02-24
Lo, Weilun (Department: 3761)
Surgery
Respiratory method or device
Means for supplying respiratory gas under positive pressure
C128S204210, C128S204250, C128S205240, C128S205190
Reexamination Certificate
active
06694976
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an oscillating air pressure generator, diaphragm unit, and a high-frequency artificial respiration apparatus using the same.
2. Description of the Related Art
As a conventional example, Japanese Patent Publication No. A2-141774 discloses a high-frequency artificial respiration apparatus for performing oxygen inhale for a patient who cannot inhale and exhale by himself/herself. This high-frequency artificial respiration apparatus includes: a blower capable of simultaneously generating a positive pressure air and a negative pressure air; an oscillating air pressure generator connected to the blower and generating an oscillating air pressure; a diaphragm urged by the oscillating air pressure for transmitting the oscillating air pressure to oxygen for inhale; an oxygen supply source; and an exhale pipe path.
FIG. 53
shows an oscillating air pressure generator
100
mounted on the high-frequency artificial respiration apparatus. This oscillating air generator includes a frame
105
having a positive pressure input port
101
urged by a positive pressure from the blower, a negative pressure input port
102
urged by a negative pressure from the blower; an atmospheric port
103
opening into the atmosphere, and an output port
104
for outputting an oscillating air. Moreover, the oscillating air pressure generator
100
has a switching valve member
106
between a first state and a second state. In the first state, the positive pressure input port
101
is connected to the output port
104
, and the negative input port
102
is connected to the atmospheric port
103
. In the second state, the positive pressure input port
101
is connected to the atmospheric port
103
, and the negative input port
102
is connected to the output port. Switching operation of this switching valve member is continuously urged by a drive unit (not depicted).
The switching valve member
106
is a modified-cylindrical body rotatably arranged in the frame. The drive unit urges this modified-cylindrical body to rotate in a predetermined rotation direction. Moreover, in the frame
105
, the positive pressure input port
101
faces one and of the switching valve member
106
and the negative pressure input port
102
faces the other end of the switching valve member. The output port
103
and the atmospheric port
104
are arranged to face the outer circumference of the modified-cylindrical body to sandwich the center shaft of the switching valve member
106
.
Furthermore, the switching valve member
106
has a first flow path
107
formed at one end of the switching valve member
106
and a second flow path
108
formed on the other end of the switching valve member
106
. These flow paths
107
and
108
are arranged at the opposing positions with respect to the center shaft.
FIG.
54
(A) is a cross sectional view about the line X—X in
FIG. 53
, and FIG.
54
(B) is a cross sectional view about the line Y—Y in FIG.
53
. The arrow Z shows the direction of rotation urged by the drive unit. The switching valve member
106
has cut-off portions at the both ends, forming the first and the second flow paths
107
and
108
. Each of the cut-off portions are cut off in the range of 180 degrees from the center axis. As shown in FIG.
54
(A) and FIG.
54
(B), the cut-off portions are symmetric with respect to a diameter of the end surface of the switching valve member
106
.
The output port
103
and the atmospheric port
104
have identical width in the rotation direction Z of the switching valve member
106
. Thus, the timing of opening and closing of the ports
103
and
104
by the flow paths
107
and
108
are matched each other.
Referring to FIG.
54
through
FIG. 57
, explanation will be given on the operation of the oscillating air pressure generator
100
. In this oscillating air pressure generator
100
, according to rotation of the switching valve member
106
, the first and the second flow paths
107
and
108
change their states as shown FIG.
54
through FIG.
47
. That is, when the positive pressure input port
101
is connected to the output port
103
in the first flow path
107
, the negative pressure input port
102
is connected to the atmospheric port
104
in the second flow path
108
. Moreover, when the positive pressure input port
101
is connected to the atmospheric port
104
in the first flow path
107
, the negative pressure input port
102
is connected to the atmospheric port
104
in the second flow path
108
. These connections are performed alternately.
Thus, an oscillating air pressure is generated from the output port
103
at the periodicity defined by the rpm urged by the drive unit, and the atmosphere is taken in and out from the atmospheric port
104
at the same periodicity.
As a second conventional example, there has been developed a high-frequency artificial respiration apparatus for performing oxygen intake to a patient who cannot breath by himself/herself. This high-frequency artificial respiration apparatus includes: a blower for simultaneously generating a positive pressure and a negative pressure; an oscillating air pressure generator connected to blower, for generating an oscillating air pressure; a diaphragm urged to oscillate by the oscillating air pressure and transmitting the oscillating air pressure to oxygen to be supplied; an oxygen source; and pipe paths for supplying oxygen and exhausting exhaled gas.
FIG. 58
shows an oscillating air pressure generator B
100
provided in the aforementioned high-frequency artificial respiration apparatus. This oscillating air pressure generator B
100
includes a frame
105
having: a positive pressure input port B
101
urged by the positive pressure from the blower; a negative input port B
102
urged by negative pressure from the blower; an atmospheric port B
103
opened to the atmosphere; and an output port B
104
for outputting an oscillating air pressure. Moreover, the oscillating air pressure generator B
100
includes a switching valve member B
106
for selectively switching between a first connection state and a second connection state. In the first connection state, the positive pressure input port B
101
is connected to the output port B
104
, and the negative pressure input port B
102
is connected to the atmospheric port B
103
. In the second connection state, the positive pressure input port B
101
is connected to the atmospheric port B
103
, and the negative pressure input port B
102
is connected to the output port B
104
. The switching operation of this switching valve member
106
is continuously urged by a drive unit (not depicted).
The switching valve member B
106
is a valve rotatably mounted in the frame B
105
. This valve by its rotation can switch between the aforementioned connection states, i.e., the first connection state (
FIG. 58
(A)) and the second connection state (
FIG. 58
(B)). These connection states are changed from one to the other repeatedly. Thus, the output port B
103
outputs an oscillating air pressure at a periodicity identical to the rpm urged by the drive unit while the atmospheric port B
104
performs take-in and take-out of the atmosphere at the same periodicity.
Furthermore, in the aforementioned oscillating air pressure generator B
100
, the output port B
104
is connected to the diaphragm and accordingly, not so much noise is caused. However, the atmospheric port B
103
is opened to the atmosphere and causes much noise. To cope with this, a silencer
110
is provided in the atmospheric port B
103
(see FIG.
59
).
The current high-frequency artificial respiration apparatus has a need of improvement in the ventilation amount of the oxygen for the patient and gas from the patient. In order to increase this ventilation amount, it has been confirmed medically that it is advantageous to increase the amplitude pressure of the oscillating air pressure generated by the oscillating air pressure generator.
In the aforementioned first conventional example, the connection of the positive pressure inp
Kamada Masahiro
Ohtake Tomohisa
Sugiura Yasuhito
Suzuki Katsuyoshi
Takaki Toshihisa
Erezo Darwin P.
Greenblum & Bernstein P.L.C.
Lo Weilun
Suzuki Motor Corporation
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