JP7587469B2 - Oxygen supply reservoir and oxygen supply system - Google Patents

Description

The present invention relates to an oxygen supply reservoir and an oxygen supply system that constitute an oxygen supply system that supplies oxygen to a patient.

Conventionally, oxygen supply systems equipped with a reservoir that temporarily stores oxygen supplied from an oxygen supply device are known. In such oxygen supply systems, oxygen supplied from the oxygen supply device during exhalation can be temporarily stored in the reservoir, making it possible to administer higher concentrations of oxygen to the patient. As such a reservoir, a pendant-type reservoir that is hung around the patient's neck like a pendant is known (see, for example, Patent Document 1).

The reservoir disclosed in Patent Document 1 has a diaphragm housed inside the housing, and the reciprocating motion of the diaphragm makes it possible to store oxygen inside the housing or to discharge the stored oxygen to the outside.

U.S. Pat. No. 5,280,780

However, with the reservoir disclosed in Patent Document 1, if the tube becomes blocked for some reason, oxygen will continue to be stored in the housing, causing the internal pressure of the reservoir to rise, raising concerns that the tube connected to the reservoir may become detached or the reservoir itself may become damaged.

The present invention was made in consideration of these circumstances, and aims to provide an oxygen supply reservoir and an oxygen supply system that can prevent the tube from coming off or the reservoir itself from being damaged, even if the internal pressure of the reservoir rises.

The oxygen supply reservoir of the present invention is a portable oxygen supply reservoir capable of storing oxygen supplied from the outside and supplying the stored oxygen to a patient, and includes a housing and a membrane body provided in the housing and configured to be capable of reciprocating motion. The housing includes an oxygen storage section that is a space defined by the housing and the membrane body and is provided inside the housing, an intake port for taking in oxygen supplied from the outside of the housing into the oxygen storage section, and an outlet port for sending the oxygen stored in the oxygen storage section to the outside of the housing. The oxygen supply reservoir further includes a pressure release section that releases the oxygen stored in the oxygen storage section to the outside of the housing through a flow path different from the intake port and the outlet port when the pressure in the oxygen storage section becomes excessively high.

In the present invention, oxygen supplied from the outside is stored in the oxygen storage section, and when the pressure inside the oxygen storage section becomes excessively high, the oxygen in the oxygen storage section can be released to the outside through the pressure release section, thereby releasing the pressure inside the housing. Therefore, even if the internal pressure of the oxygen supply reservoir rises, it is possible to prevent the tube connected to the oxygen supply reservoir from coming loose or the oxygen supply reservoir itself from being damaged.

In a preferred embodiment of the oxygen supply reservoir of the present invention, at least a portion of the outer edge of the membrane body is configured so that a gap is formed between the membrane body and the housing only when the pressure in the oxygen storage section becomes excessively high, and the gap functions as the pressure release section.

In the above embodiment, excess pressure within the housing can be released through the gap formed between the housing and the membrane. In addition, since the pressure release section is made up of two parts, the housing and the membrane, and no special parts are required to form the pressure release section, the number of parts and the increase in manufacturing costs can be suppressed.

In a preferred embodiment of the oxygen supply reservoir of the present invention, the housing is provided with a pressing portion that presses the partial area at the outer edge of the membrane toward the housing, and the pressing portion protrudes from a position on the inner surface of the housing that corresponds to the partial area.

In the above embodiment, the pressing portion functions as a so-called valve. Specifically, when the pressure inside the oxygen storage portion is normal or lower, the pressing portion presses the membrane to prevent oxygen from leaking out through the gap formed between the housing and the membrane, while when the pressure inside the oxygen storage portion becomes excessively high, the pressing portion functions to allow oxygen to escape through the gap formed between the housing and the membrane to prevent an excessive increase in internal pressure.

In a preferred embodiment of the oxygen supply reservoir of the present invention, the housing is configured to be made up of two cases that can be fitted together, and when the two cases are fitted together, the membrane is sandwiched between the two cases.

In the above embodiment, the present invention can be realized relatively easily by sandwiching the membrane between the two cases.

In a preferred embodiment of the oxygen supply reservoir of the present invention, the two cases are each provided with a claw portion and a hole portion that can be engaged with each other, and the two cases are configured to be able to be fitted together by engaging the claw portion with the hole portion.

In the above embodiment, the two cases can be firmly fixed together by engaging the claws with the holes.

In a preferred embodiment of the oxygen supply reservoir of the present invention, each of the two cases has a protrusion and a groove that can fit together, and the two cases can be fitted together by fitting the protrusion into the groove.

In the above embodiment, the two cases can be firmly fixed together by fitting the protrusions into the grooves.

In a preferred embodiment of the oxygen supply reservoir of the present invention, the membrane body is made of a diaphragm.
In the above aspect, the present invention can be realized with a relatively simple configuration.

The oxygen supply system of the present invention comprises an oxygen supply device that supplies oxygen to a patient, an oxygen supply reservoir of the present invention, a prong that can be attached to the patient, a first tube that connects the oxygen supply device to the oxygen supply reservoir, and a second tube that connects the oxygen supply reservoir to the prong.

In the present invention, oxygen supplied from an oxygen supply device is stored in an oxygen storage section, and when the pressure inside the oxygen storage section increases, the oxygen inside the oxygen storage section can be discharged to the outside through a pressure release section to release the internal pressure. Therefore, even if the internal pressure of the oxygen supply reservoir increases, it is possible to prevent the tubes from coming loose or the reservoir itself from being damaged, and oxygen can be supplied to the patient more appropriately.

According to the present invention, even if the internal pressure of the oxygen supply reservoir increases, it is possible to prevent the tube from coming off or the oxygen supply reservoir itself from being damaged.

1 is a schematic diagram showing an oxygen supply system according to a first embodiment of the present invention. FIG. 2 is a perspective cross-sectional view of the oxygen supply reservoir of the first embodiment. FIG. 2 is an exploded perspective view of the oxygen supply reservoir according to the first embodiment. FIG. 2 is a bottom view of the oxygen supply reservoir of the first embodiment. 5 is a cross-sectional view of the oxygen supply reservoir taken along line A1-A1 in FIG. 4. 5 is a cross-sectional view of the oxygen supply reservoir taken along line B1-B1 shown in FIG. 4. 7 is an enlarged cross-sectional view showing a main part of the oxygen supply reservoir shown in FIG. 6. FIG. 11 is a perspective view showing an oxygen supply reservoir according to a second embodiment of the present invention. FIG. 13 is a bottom view of the oxygen supply reservoir of the second embodiment. 10 is a cross-sectional view of the oxygen supply reservoir taken along line C1-C1 shown in FIG. 9. 11 is an enlarged cross-sectional view showing a main part of the oxygen supply reservoir shown in FIG. 10. FIG. 11 is a perspective view showing an oxygen supply reservoir according to a third embodiment of the present invention. 13 is a cross-sectional view for explaining a main part of the oxygen supply reservoir shown in FIG. 12. FIG.

Below, various embodiments of the oxygen supply system of the present invention and the oxygen supply reservoir used therein will be described with reference to the drawings.

[First embodiment]
The oxygen supply system 100 of this embodiment is a system that supplies oxygen to a patient P. As shown in Fig. 1, the oxygen supply system 100 includes an oxygen supply device 10, a portable oxygen supply reservoir 20 capable of storing oxygen supplied from the oxygen supply device 10, a first tube 11 that connects the oxygen supply device 10 and the oxygen supply reservoir 20, a prong 13 attached to the patient P, and a second tube 12 that connects the oxygen supply reservoir 20 and the prong 13.

When the oxygen supply device 10 is activated, oxygen is supplied to the oxygen supply reservoir 20 via the first tube 11. The oxygen supply reservoir 20 stores the supplied oxygen and supplies the stored oxygen to the patient P via the second tube 12 and the prongs 13.

Although not shown in FIG. 1, the oxygen supply reservoir 20 is provided with an insertion portion 24 through which a string or the like can be passed (see FIG. 3), so that the oxygen supply reservoir 20 can be used by hanging it around the neck of the patient P like a pendant. When the oxygen supply reservoir 20 is used by hanging it around the neck of the patient P as shown in FIG. 1, the insertion portion 24 is located at the top, and the first case 30 described below faces forward.

[Configuration of oxygen supply reservoir]
2 to 4, the oxygen supply reservoir 20 includes a housing 21 that is generally circular in plan view, a membrane body 60 that is disposed within the housing 21 and configured to be capable of reciprocating motion, and a cover 50 that is disposed within the housing 21. The aforementioned insertion portion 24 is formed on the outer periphery of the housing 21.

As shown in Figs. 2 and 3, the housing 21 is composed of two cases, a first case 30 and a second case 40, which are formed so as to be able to fit together. The housing 21 is provided with an oxygen storage section 22 provided within the housing 21, an intake port 25 disposed in the second case 40 and to which the first tube 11 is connected, and an outlet port 26 disposed in the second case 40 and to which the second tube 12 is connected. Each component will be described in detail below.

The first case 30 is formed, for example, from a synthetic resin. As shown in FIG. 3, the first case 30 has a dome portion 31 that is circular in plan view, and a first side portion 32 that hangs down (extends downward) from the outer periphery of the dome portion 31. When viewed from the side, the dome portion 31 is dome-shaped with the height being highest in the center and decreasing toward the radially outward direction, and multiple long holes 311 are formed in a substantially radial pattern. Inside the first case 30, a space S1 is formed that is partitioned by a membrane body 60, as shown in FIG. 2.

A pressing portion 33 is formed on the radially inner side of the first side portion 32, which presses the outer edge portion 62 of the membrane body 60 toward the second case 40. Although not illustrated, the pressing portion 33 protrudes in a ring shape from the inner surface of the first case 31. Also, as shown in Figures 3 and 4, the first side portion 32 is formed with four claw portions 34 that engage with the hole portions 461 of the second case 40 at equal intervals (at an arrangement interval of approximately 90 degrees with respect to the center position of the housing 21). The tip portions 341 of the claw portions 34 are bent radially outward as shown in Figures 2 and 5, and the bent portions are configured to engage with the stepped portions of the hole portions 461.

The second case 40 is formed of, for example, synthetic resin, in the same manner as the first case 30. As shown in FIG. 2, the second case 40 has a bottom surface portion 41, a second inner side surface portion 42 extending upward from the outer periphery of the bottom surface portion 41, an extension portion 43 formed continuously with the second inner side surface portion 42 and extending radially outward, a second outer side surface portion 45 formed continuously with the extension portion 43 and extending upward from the outer periphery of the extension portion 43, and a flow path 47 formed in the bottom surface portion 41. The extension portion 43 has a protrusion portion 44 formed therein that protrudes toward the first case 30. The protrusion portion 44 is located radially outward from the pressing portion 33 of the first case 30, and clamps the membrane body 60 together with the pressing portion 33.

2 and 6, a storage groove 46 for storing the first side surface 32 of the first case 30 is formed between the protrusion 44 and the second outer side surface 45. As shown in FIG. 2 and FIG. 5, the storage groove 46 has four holes 461 with which the claws 34 engage. The four holes 461 are formed at equal intervals (at an arrangement interval of approximately 90 degrees with respect to the center position of the housing 21) like the four claws 34. The holes 461 are formed by cutting out a part of the radially outer wall surface of the wall surface that constitutes the storage groove 46, and the tip 341 of the claw 34 hooks into this cutout portion.

As shown in Figures 2 and 3, the flow path 47 is formed in the bottom surface portion 41, and oxygen supplied from the oxygen supply device 10 flows through this flow path 47. This flow path 47 is shaped to be separated into two parts (roughly Y-shaped in plan view), and one intake port 25 and two delivery ports 26 are arranged at the end of the flow path. In addition, on both sides of the part just before the flow path 47 branches (the intermediate position between the intake port 25 and the delivery port 26), storage walls 473 are formed to store the oxygen supplied from the intake port 25.

The cover 50 is made of, for example, synthetic resin, and is arranged inside the second case 40 so as to cover the flow path 47, as shown in Figs. 2 and 5. Two communication holes 51 are formed in the cover 50 at positions opposite the storage wall 473. Therefore, oxygen supplied into the flow path 47 through the first tube 71 and the intake port 25 flows into the oxygen storage section 22 through the storage wall 473 and the communication holes 51.

As shown in FIG. 3, the membrane body 60 is a synthetic resin diaphragm having a circular shape in a plan view. As shown in FIG. 5, the membrane body 60 has a central portion 61 that protrudes (is raised) toward the first case 30, and an outer edge portion 62 is sandwiched between the first case 30 and the second case 40. Specifically, the upper surface of the membrane body 60 is pressed by the pressing portion 33 from the radially inner side, and the lower surface of the membrane body 60 is pressed by the protruding portion 44 from the radially outer side, and the membrane body 60 is fixed by the first case 30 and the second case 40 in a crushed state with the outer edge portion 62 of the membrane body 60. As shown in FIG. 2 and FIG. 5, the thickness of the outer peripheral end of the membrane body 60 (the end of the outer edge portion 62) is formed to be thicker than the thickness of the other parts of the membrane body 60. The membrane body 60 is pressed by the pressing portion 33 so that the outer peripheral end of the membrane body 60 is located outside the pressing portion 33.

The first case 30, the membrane 60, the cover 50, and the second case 40 are stacked in the order shown in FIG. 3, and the first case 30 is attached to the second case 40 to form the oxygen supply reservoir 20.

[Configuration of oxygen storage section]
The oxygen storage section 22 is a space partitioned by the second case 40 and the membrane body 60. As described above, when oxygen taken in from the intake port 25 flows into the oxygen storage section 22, the membrane body 60 expands toward the first case 30. Since the membrane body 60 is formed by a diaphragm, the pressure inside the oxygen storage section 22 does not increase significantly until a predetermined amount of oxygen is stored in the oxygen storage section 22. However, when oxygen flows into the oxygen storage section 22 in excess of a predetermined amount (a specified amount), the membrane body 60 is stretched to its limit, and the pressure inside the oxygen storage section 22 increases excessively. In this embodiment, a pressure release section 70 is provided that releases the oxygen stored in the oxygen storage section 22 to the outside of the housing 21 when the pressure inside the oxygen storage section 22 increases excessively.

[Configuration of pressure release section]
The pressure release section 70 is a gap between the second case 40 and the membrane body 60 that is formed when the membrane body 60 pushes up the first case 30 when the pressure in the oxygen storage section 22 becomes excessively high. Specifically, when the pressure in the oxygen storage section 22 increases and exceeds a predetermined pressure, the membrane body 60 lifts the first case 30. At this time, the first case 30 does not lift up in the portion where the tip portion 341 of the claw portion 34 is engaged with the hole portion 461, but in the other portion (the portion where the claw portion 34 is not engaged with the hole portion 461), the first case 30 is deformed so as to lift up relative to the second case 40, forming a gap between the second case 40 and the membrane body 60 (see FIG. 7), and oxygen escapes from this gap to the outside through the boundary portion between the first side portion 32 of the first case 30 and the second outer side portion 45 of the second case 40 and the hole portion 461. A gap is formed between the second case 40 and the membrane 60 when the pressure in the oxygen storage section 22 becomes excessively high, but is not formed when the pressure in the oxygen storage section 22 is normal or lower. In other words, when the pressure in the oxygen storage section 22 is normal or lower, the second case 40 and the membrane 60 are in close contact with each other, so that the oxygen storage section 22 is sealed except for the paths to the intake port 25 and the delivery port 26.

In this embodiment, oxygen supplied from the oxygen supply device 10 is stored in the oxygen storage section 22, and when the pressure inside the oxygen storage section 22 becomes excessively high, the oxygen inside the oxygen storage section 22 is released to the outside through the pressure release section 70 (the gap 70 formed between the second case 40 and the membrane body 60), thereby releasing the pressure inside the oxygen storage section 22. Therefore, even if the internal pressure of the oxygen supply reservoir 20 increases, it is possible to prevent the first tube 71 and the second tube 72 connected to the oxygen supply reservoir 20 from coming off, or the oxygen supply reservoir 20 itself from being damaged.

In this embodiment, the outer edge 62 of the membrane body 60 is configured so that a gap 70 is formed between the housing 21 (second case 40) and the membrane body 60 only when the pressure inside the oxygen storage section 22 becomes excessively high. Therefore, since there is no need for a dedicated part to form the pressure release section, and the pressure release section is formed from two parts, the housing 21 and the membrane body 60, it is possible to suppress an increase in the number of parts and manufacturing costs.

In this embodiment, the pressing portion 33 described above is provided, and the pressing portion 33 functions as a so-called valve. Specifically, when the pressure inside the oxygen storage portion 22 is normal or lower, the pressing portion 33 presses the membrane body 60 to prevent oxygen from leaking out from the gap 70 formed between the second case 40 and the membrane body 60, while when the pressure inside the oxygen storage portion 22 becomes excessively high, the pressing portion 33 functions to prevent excessive internal pressure increase by releasing oxygen from the gap 70 formed between the second case 40 and the membrane body 60.

In this embodiment, the housing 21 is composed of a first case 30 and a second case 40 that can be fitted together, and is configured so that the membrane body 60 is sandwiched between the first case 30 and the second case 40 when the first case 30 and the second case 40 are fitted together. This makes it relatively easy to realize the oxygen supply reservoir 20 that has the excellent effects described above.

In this embodiment, the first case 30 and the second case 40 can be firmly fixed together by engaging the claw portion 34 with the hole portion 461.

In this embodiment, the membrane body 60 is made of a diaphragm, so that an oxygen supply reservoir 20 having the excellent effects described above can be realized with a relatively simple configuration.

[Second embodiment]
Next, an oxygen supply reservoir according to a second embodiment of the present invention will be described with reference to the drawings.
8 is a perspective view showing the oxygen supply reservoir 20A of this embodiment, FIG. 9 is a bottom view of the oxygen supply reservoir 20A shown in FIG. 8, FIG. 10 is a cross-sectional view of the oxygen supply reservoir 20A taken along line C1-C1 shown in FIG. 9, and FIG. 11 is an enlarged cross-sectional view showing a main portion of the oxygen supply reservoir shown in FIG. 10.

The oxygen supply reservoir 20A of this embodiment differs from the oxygen supply reservoir 20 of the first embodiment in the configuration of the attachment portion between the first case 30A and the second case 40A and the configuration of the pressure release portion. In the following explanation, the same or substantially the same configuration as the oxygen supply reservoir 20 of the first embodiment is indicated by the same reference numerals, and the explanation is omitted or simplified.

As shown in Figures 8, 10, and 11, the housing 21A of the oxygen supply reservoir 20A is composed of two cases, a first case 30A and a second case 40A. A convex rib 321 that protrudes radially outward is formed on the first side portion 32A of the first case 30A in the circumferential direction. The lower side of this convex rib 321 (the bottom side of the housing 21A) is an inclined surface (tapered shape), and the upper side is stepped.

As shown in Figures 10 and 11, a groove 451 that engages with the protrusion 321 is formed on the second outer side surface 45A of the second case 40A. This groove 451 is formed in a concave arc shape in cross section, and its vertical length in Figures 10 and 11 is set to approximately twice the vertical length of the protrusion 321.

These ridges 321 and grooves 451 are formed continuously on the outer periphery of the first side portion 32A and the outer periphery of the second outer side portion 45A, so that the entire circumference of the first case 30A and the second case 40A are in tight contact with each other.

Further, an air vent 462 communicating with the outside of the housing 21A is formed on the outer periphery of the second case 40A at the boundary between the extension portion 43 and the second outer side surface portion 45. As shown in Fig. 9, two of these air vents 462 are formed at positions facing each other across the center of the second case 40A (at an arrangement interval of approximately 180 degrees with respect to the center position of the housing 21A). As shown in Figs. 9 to 11, this air vent 462 is formed by cutting out the connection portion between the extension portion 43 and the second outer side surface portion 45A, and is approximately rectangular in plan view.
These ventilation holes 462 have a radial width (hereinafter referred to as the "depth (of the ventilation hole)") set to, for example, 3 mm, and a circumferential width (hereinafter simply referred to as the "width (of the ventilation hole)") set to, for example, 3 mm.

In this embodiment, as shown in FIG. 11, when the pressure inside the oxygen storage section 22 becomes excessively high, the membrane body 60 lifts the first case 30A, and a gap 70 that functions as a pressure release section is formed between the second case 40A and the membrane body 60, and oxygen is configured to escape to the outside from this gap 70 through the air vent 462.

In this embodiment, the first case 30A and the second case 40A can be firmly fixed together by engaging the protrusion 321 with the groove 451.

[Third embodiment]
Next, an oxygen supply reservoir according to a third embodiment of the present invention will be described with reference to the drawings.
Fig. 12 is a perspective view showing an oxygen supply reservoir 20B according to this embodiment, and Fig. 13 is a cross-sectional view shown for explaining a main part of the oxygen supply reservoir 20B shown in Fig. 12.

The oxygen supply reservoir 20B of this embodiment differs from the oxygen supply reservoir 20A of the second embodiment in the configuration of the first case 30B. In the following description, the same or substantially the same configuration as the oxygen supply reservoir 20A of the second embodiment is indicated by the same reference numerals, and the description is omitted or simplified.

As shown in Figures 12 and 13, the first case 30B of the oxygen supply reservoir 20B has two irregular holes 312 arranged in some of the multiple long holes 311 formed in the dome portion 31B. Each irregular hole 312 is roughly L-shaped in a plan view, and the two irregular holes 312 are arranged so as to be line-symmetrical.

The irregular hole 312 is located on the opposite side of the center of the housing 21B from the insertion part 24. When the oxygen supply reservoir 20B is hung from the patient's neck like a pendant, the insertion part 24 is located at the top, while the irregular hole 312 is located at the bottom.

Of the edges constituting the irregular hole 312, the edge portion 313 located near the outer periphery is inclined with respect to the side surface of the housing 21B. Specifically, the edge portion 313 is inclined so that the opening area of the irregular hole 312 increases from the inner surface toward the outer surface of the dome portion 31B.

In this embodiment, as in the case shown in FIG. 11 of the second embodiment, when the pressure inside the oxygen storage section 22 becomes excessively high, the membrane body 60 lifts the first case 30B, and a gap that functions as a pressure release section is formed between the second case 40A and the membrane body 60, and oxygen is configured to escape to the outside from this gap through the air vent 462.

The irregular hole 312 is located on the opposite side of the center of the housing 21B from the insertion part 24. When the oxygen supply reservoir 20B is hung from the patient's neck like a pendant, the insertion part 24 is located at the top, while the irregular hole 312 is located at the bottom. For this reason, for example, when the oxygen supply reservoir 20B is used during bathing, even if water gets into the space S1 partitioned by the first case 30B and the membrane body 60, the irregular hole 312 serves as a drainage hole and allows the water to be discharged outside the first case 30B.

In addition, the edge portion 313 that is close to the outer periphery of the periphery of the irregular hole 312 is inclined with respect to the side surface of the housing 21B, so that when the oxygen supply reservoir 20B is hung around the patient's neck like a pendant, water that has entered the space S1 can be efficiently expelled to the outside.

The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, the following modifications are also possible.
For example, in the first embodiment, four claws 34 and four holes 461 are provided, but the number is not limited to four and may be three or less. Also, five or more claws 34 and holes 461 may be provided, and the number may be freely set within a range in which an appropriate gap is formed between adjacent claws 34 and holes 461.

In the second and third embodiments, the ventilation holes 462 are formed in two locations, but this is not limited thereto, and the number of ventilation holes may be one location or three or more locations.

In the second and third embodiments, the ventilation hole 462 is formed at the boundary between the extension portion 43 and the second outer side surface portion 45, but is not limited to this. For example, the ventilation hole may be provided in the extension portion 43 at a position that is inside the boundary between the extension portion 43 and the second outer side surface portion 45 and outside the protrusion portion 44 (directly below the first side surface portion 32A).

In the above embodiment, the gap formed between the outer edge of the membrane body and the housing is formed around the entire circumference of the membrane body, but the present invention is not limited to this, and a gap may be formed only in a partial area of the outer edge of the membrane body. For example, the first case may be removed from the housing described in the above embodiment, the membrane body may be arranged to cover the upper end surface of the second case, and the second case and the membrane body may be bonded together so that a gap is formed between the second case and a partial area of the outer edge of the membrane body when the pressure in the oxygen storage section becomes excessive.

In the above embodiment, a case where there is one intake and two outlets (where the flow path 47 is approximately Y-shaped) has been described as an example, but the present invention is not limited to this, and other configurations may also be used, such as one intake and one outlet (where the flow path is I-shaped).

The material, shape, dimensions, number, location, etc. of each component in the above-described embodiment are arbitrary as long as they can achieve the present invention, and are not limited. For example, the above-described embodiment has been described with an example in which the housing (first case and second case) etc. are made of synthetic resin, but other materials, such as metal, may also be used. Also, the above-described embodiment has been described with an example in which the housing is approximately circular in plan view, but it may be other shapes, such as a square (diamond) in plan view.

The effects of the present invention will be described below based on examples and comparative examples. In the oxygen supply reservoirs of Examples 1 to 4, similar to the oxygen supply reservoir 20A described in the second embodiment, when the pressure in the oxygen storage section increases excessively, the membrane lifts the first case, and a gap that functions as a pressure release section is formed between the second case and the membrane, and the number and size (opening area) of the vent holes provided in the second case are different. To be more specific, the oxygen supply reservoir of Example 1, similar to the oxygen supply reservoir 20A described in the second embodiment, has two vent holes (width 3 mm x depth 3 mm) provided in the second case. The oxygen supply reservoir of Example 2 has the same size of the vent hole as Example 1, but has only one vent hole. The oxygen supply reservoir of Example 3 has the same number of vent holes as Example 1, and the width of each vent hole is set to 1.5 mm. The oxygen supply reservoir of Example 4 has the same number of vent holes as Example 1, and the depth of each vent hole is set to 5 mm. As a comparative example, a reservoir for oxygen supply 20A described in the second embodiment is used as a base, but the two vent holes in the second case are removed, and a gap is prevented from being formed between the second case and the membrane even if the pressure in the oxygen storage section becomes excessive.

For each of the oxygen supply reservoirs in Examples 1 to 4 and the Comparative Example, a flowmeter (manufactured by Kofloc Corporation) was connected to the inlet via a tube, and a prong (manufactured by Atom Medical Corporation) was connected to the outlet via a tube. The tube used was manufactured by Atom Medical Corporation and had an inner diameter of 4 mm. Oxygen (0.4 MPa, 7 L/min) was passed through the oxygen supply reservoirs in Examples 1 to 4 and the Comparative Example, the tube on the prong side was blocked, and a pressure gauge was connected in the circuit to measure the pressure rise of each oxygen supply reservoir. The measurement results for Examples 1 to 4 and the Comparative Example are shown in Table 1.

In Examples 1 to 4, when the internal pressure increased, the oxygen in the oxygen storage section was able to escape to the outside of the housing, so the pressure increase was kept to 65 kPa or less, and it was confirmed that the device had sufficient performance.
On the other hand, in the comparative example, the first case came off and the membrane burst when the withstand pressure reached 250 to 350 kPa.

In other words, as in Examples 1 to 4, if the oxygen supply reservoir has a gap between the second case and the membrane body that functions as a pressure release section when the pressure inside the oxygen storage section increases excessively, as in the case of the oxygen supply reservoir in which the membrane body lifts the first case, it has been confirmed that even if the internal pressure of the oxygen supply reservoir increases, it is possible to prevent the tube from coming off or the oxygen supply reservoir itself from being damaged.

10...Oxygen supply device 11...First tube 12...Second tube 13...Prongs 20, 20A, 20B...Oxygen supply reservoir 21, 21A, 21B...Housing 22...Oxygen storage section 24...Insertion section 30, 30A, 30B...First case 31, 31B...Dome section 311...Elongated hole 312...Irregularly shaped hole 313...Edge portion of irregularly shaped hole 32, 32A...First side Surface portion 33...pressure portion 34...claw portion 341...tip portion 40, 40A...second case 41...bottom surface portion 42...second inner side surface portion 43...extension portion 44...projection portion 45, 45A...second outer side surface portion 451...groove portion 46...accommodation groove portion 461...hole portion 462...vent hole 47...flow path 50...cover 51...communication hole 60...membrane body 61...center portion 62...outer edge portion 70...pressure release portion (gap)
100...oxygen supply system P...patient S1...space (space partitioned by first case and membrane body)

Claims (6)

A portable oxygen supply reservoir capable of storing oxygen supplied from an external source and supplying the stored oxygen to a patient, comprising:
a housing including a first case and a second case that are fittable with each other and made of synthetic resin ;
a membrane provided in the housing and configured to be capable of reciprocating motion;
the film body is configured to be sandwiched between the first case and the second case when the first case and the second case are fitted together,
The housing includes:
an oxygen reservoir provided inside the housing and defined by the second case and the membrane;
an intake port for taking in oxygen supplied from outside the housing into the oxygen storage section;
An outlet through which the oxygen stored in the oxygen storage section is sent to the outside of the housing is provided,
a pressure release section that releases the oxygen stored in the oxygen storage section to the outside of the housing through a flow path different from the intake port and the delivery port when the pressure in the oxygen storage section becomes excessively high ;
At least a part of the outer edge of the membrane body is configured such that the first case is pushed up by the membrane body only when the pressure in the oxygen storage section becomes excessively high, and a gap is formed between the membrane body and the second case at this time,
2. The oxygen supply reservoir according to claim 1, wherein the gap functions as the pressure release portion . The first case and the second case are respectively provided with a claw portion and a hole portion that can be engaged with each other,
2. The oxygen supply reservoir according to claim 1 , wherein the first case and the second case are configured to be able to be fitted together by engaging the claws with the holes. The first case and the second case are each provided with a protrusion and a groove that can be fitted into each other,
2. The oxygen supply reservoir according to claim 1 , wherein the first case and the second case are configured to be able to fit together by fitting the protrusion into the groove. the housing is provided with a pressing portion that presses the partial region at the outer edge of the membrane toward the housing,
2. The oxygen supply reservoir according to claim 1 , wherein the pressing portion protrudes from a position on the inner surface of the housing that corresponds to the partial region. 5. The oxygen supply reservoir according to claim 1, wherein the membrane body is a diaphragm. an oxygen supply device for supplying oxygen to a patient;
An oxygen supply reservoir according to any one of claims 1 to 5 ;
prongs attachable to the patient;
a first tube connecting the oxygen supply device and the oxygen supply reservoir;
and a second tube connecting the oxygen supply reservoir and the prong.

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