JP2020058607A - Medical suction device - Google Patents

Abstract

To provide a medical suction device that easily adjusts a suction speed and a suction quantity of drainage, and can efficiently suck the drainage.SOLUTION: A medical suction device comprises a negative-pressure container, an exhaust part (exhaust member 4) capable of producing a negative pressure in the negative-pressure container by exhausting air to the outside, a negative-pressure container side one-way valve 8 arranged between the negative-pressure container and the exhaust member 4, and an exhaust part side one-way valve 7 arranged between the exhaust member 4 and the outside. The negative-pressure container side one-way valve 8 blocks suction from the exhaust member 4 to the negative-pressure container while allowing exhaust of air from the negative-pressure container to the exhaust member 4 when the exhaust member 4 recovers from a second state to a first state. The negative-pressure container side one-way valve 8 allows exhaust of air from the negative-pressure container to the exhaust member 4 even when drainage is sucked by the medical suction device, a pressure in the negative-pressure container is increased, and thereby the exhaust member 4 is in the first state.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a medical suction device having a one-way valve.

  BACKGROUND ART A medical suction device including a negative pressure container that sucks body fluid (also called drainage) when sucking and discharging the body fluid from a human body through a tube is generally used. Some of such medical suction devices are provided with a one-way valve in order to discharge the air in the negative pressure container to the outside to make a negative pressure.

For example, Patent Document 1 discloses a medical suction device including an exhaust member (which is described as a pump section in the document) that is elastically deformable in a squeezable and restorable manner and two one-way valves. .
One one-way valve is arranged at the exhaust port of the exhaust member and allows the exhaust of air and blocks the intake. The other one-side valve is provided at a connection part of the negative pressure container (in the same document, referred to as a suction container) with the exhaust member, and allows the flow of air from the inside of the negative pressure container to the inside of the exhaust member. However, the air is prevented from returning from the inside of the exhaust member to the inside of the negative pressure container.

Although the configuration of the other one-way valve is not described in detail in Patent Document 1, a conventional one-way valve generally uses an elastically deformable film.
Regarding the configuration of the conventional one-way valve, specifically, the above connecting portion is provided with a communication hole of a lateral hole that communicates with the inside of the negative pressure container and the inside of the exhaust member, and is elastically deformed in the radial direction. The film is in a state of being pressed against the communication hole so that the communication hole is covered and sealed.
The one-way valve configured by this film closes the communication hole by the surface pressure of the film during compression. On the other hand, this one-way valve allows the film to expand in the radial direction and float up from the communication hole only when the exhaust member is restored from the compressed state to the natural state, and the air from the inside of the negative pressure container to the inside of the exhaust member is discharged. The flow of is allowed.

JP, 2013-74914, A

The one-way valve constituted by the conventional film described above allows the flow of air from the inside of the negative pressure container to the inside of the exhaust member only when the exhaust member is restored from the compressed state to the natural state. That is, when the exhaust member is not operated, it is in a state of being pressed against the periphery of the communication hole, so that the flow of air between the negative pressure container and the exhaust member is prevented.
With such a one-way valve, since the negative pressure state of the negative pressure container is maintained, it is difficult to adjust the suction speed and suction amount of the drainage.

  Further, for example, the negative pressure state of the negative pressure container is temporarily made equal to the atmospheric pressure by opening a cap (fixing member) or the like, and then the body fluid (described as a storage container in the document) ( When the amount of stored (drainage) is increased, the inside of the container is pressurized to a pressure higher than atmospheric pressure. This is because the discharge of air from the storage container is regulated by the one-way valve, which reduces the volume of air.

  When the inside of the storage container is pressurized in this way, the body fluid cannot be sent into the storage container. Therefore, it is necessary to exhaust the air inside the container by the amount of the received body fluid. However, since the force with which the body fluid tries to enter the container is very weak, the film does not extend in the radial expansion direction depending on the one-way valve that is constituted by the film and is pressed against the container, and the body fluid cannot enter the container. For this reason, it takes time and labor to remove one end of the connecting tube for connecting the storage container and the negative pressure container to open to the atmosphere, and it has been difficult to efficiently suck body fluid.

  The present invention has been made in view of the above problems, and it is easy to adjust the suction speed and suction amount of drainage, and to provide a medical suction device capable of efficiently sucking drainage. To do.

  The medical suction device of the present invention is a medical suction device that sucks drainage by negative pressure formed by a negative pressure container, and is connected to the negative pressure container and the negative pressure container, and has elasticity. And an exhaust unit configured to be deformable between a first state and a second state compressed from the first state, capable of exhausting air to the outside to make the negative pressure container a negative pressure. A negative pressure container-side one-way valve disposed between the negative pressure container and the exhaust unit, and disposed between the exhaust unit and the outside while allowing exhaust from the exhaust unit to the outside. An exhaust-portion-side one-valve that blocks intake from the outside to the exhaust unit, the negative-pressure-container-side one-valve being used when the exhaust unit restores from the second state to the first state. While allowing the air to be exhausted from the negative pressure container to the exhaust unit, the exhaust unit is allowed to move from the first state to the When the state is changed to 2, the intake from the exhaust unit to the negative pressure container is blocked, and the one-way valve on the side of the negative pressure container causes the drainage liquid to be sucked by the medical suction device and the pressure of the negative pressure container. Is increased, allowing the exhaust of the air from the negative pressure container to the exhaust unit when the exhaust unit is in the first state.

  INDUSTRIAL APPLICABILITY The medical suction device of the present invention can easily adjust the suction speed and the suction amount of drainage, and can efficiently suck the drainage.

It is a perspective view which shows the medical suction instrument which concerns on this embodiment. It is a perspective view showing a negative pressure container side one-way valve. It is sectional drawing of the exhaust member and the negative pressure container side one-way valve which show the flow of air when squeezing the exhaust member which concerns on this embodiment. It is sectional drawing of the exhaust member and the negative pressure container side one valve which shows the flow of air when the exhaust member which was compressed is restoring. It is sectional drawing which shows the negative pressure container side one valve which concerns on a modification, and is a figure which shows the state which has closed the communicating hole. It is sectional drawing which shows the negative pressure container side one valve which concerns on a modification, and is a figure which shows the state which has opened the communicating hole.

Hereinafter, an embodiment of a medical suction device of the present invention will be described with reference to the drawings.
The embodiments described below are merely examples for facilitating the understanding of the present invention and do not limit the present invention. That is, the shapes, dimensions, and arrangements of the members described below can be changed and improved without departing from the gist of the present invention, and it goes without saying that the present invention includes equivalents thereof.
Moreover, in all the drawings, the same components are denoted by the same reference numerals, and the duplicate description will be appropriately omitted. In the following, the “vertical direction” refers to the vertical direction in the state where the medical suction device 1 is erected as shown in FIG.

<Outline>
First, the outline of the medical suction device 1 according to the present embodiment will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view showing a medical suction device 1 according to this embodiment, and FIG. 2 is a perspective view showing a negative pressure container side one-way valve 8. FIG. 3 is a cross-sectional view of the exhaust member 4 and the negative pressure container side one-way valve 8 showing the flow of air when the exhaust member 4 according to the present embodiment is being squeezed, and FIG. FIG. 8 is a cross-sectional view of the exhaust member 4 and the negative pressure container side one-way valve 8 showing the flow of air when is restored.

The medical suction device 1 according to the present embodiment suctions drainage by the negative pressure formed by the negative pressure container 2.
The medical suction device 1 is connected to the negative pressure container 2 and the negative pressure container 2, and is capable of exhausting air to the outside to form a negative pressure in the negative pressure container 2 (exhaust member 4). And a negative pressure container side one valve 8 arranged between the negative pressure container 2 and the exhaust member 4, and an exhaust part side one valve 7 arranged between the exhaust member 4 and the outside.
The exhaust member 4 has elasticity and is configured to be deformable into a first state (natural state) and a second state (compressed state) compressed from the first state.

The negative pressure container side one-way valve 8 allows the exhaust of air from the negative pressure container 2 to the exhaust member 4 when the exhaust member 4 is restored from the second state to the first state. Further, the negative pressure container side one-way valve 8 blocks intake from the exhaust member 4 to the negative pressure container 2 when the exhaust member 4 changes from the first state to the second state.
Further, the one-way valve 8 on the negative pressure container side is configured such that the drainage is sucked by the medical suction device 1 and the pressure of the negative pressure container 2 is increased, so that the negative pressure container 2 is in the first state when the exhaust member 4 is in the first state. From the air to the exhaust member 4 is permitted.

According to the above configuration, when the pressure of the negative pressure container 2 is increased by sucking the drainage, the negative pressure container side one-way valve 8 allows the air to pass through the exhaust member 4 and is naturally discharged to the outside. Therefore, it is possible to prevent the pressure in the negative pressure container 2 from increasing too much without touching the medical suction device 1.
Furthermore, by adjusting the relative position of the negative pressure container 2 in a height range lower than that of the affected part, it is possible to slowly discharge the drainage to the outside of the body according to the siphon principle and store it in the container 3. When the storage container 3 is filled with the body fluid, the internal pressure of the storage container 3 and the negative pressure container 2 communicating with the storage container 3 recovers to near atmospheric pressure, and the suction of the body fluid can be naturally completed, which is efficient. Can perform procedures.

<Overall structure>
First, the overall configuration of the medical suction device 1 will be described with reference to FIG. The medical suction device 1 includes a negative pressure container 2 that is in a negative pressure state, a storage container 3 that stores body fluid and the like, and an exhaust for exhausting air in the medical suction device 1 (negative pressure container 2) to the outside. A member 4 and a balloon 5 for confirming the pressure state of the negative pressure container 2 are mainly provided.

A cap 2a is attached to the lower portion of the negative pressure container 2 to allow the air in the negative pressure container 2 to communicate with the outside to remove the air. Further, the balloon 5 is arranged inside the negative pressure container 2 by the cap 2 a.
The negative pressure container 2 and the storage container 3 are internally connected by a connection tube 6.

A suction port 3a and a discharge port 3c are provided on the top of the container 3. A tube (not shown) is connected to the suction port 3a so that body fluid or the like can be stored in the storage container 3. The body fluid and the like stored in the storage container 3 can be directly discharged through the discharge port 3c.
A clamp member 3b is attached to the suction port 3a, and by blocking the flow path connected to the suction port 3a by the clamp member 3b, it is possible to stop the inflow of body fluid from the human body into the storage container 3. Has been done. It is preferable that the connection member having the suction port 3a be provided with a one-way valve having the same configuration as the one-way valve described later for preventing backflow of the drainage from the storage container 3 into the body.

The negative pressure container 2 has a cylindrical connecting portion 2b protruding upward, and the exhaust member 4 is connected to the connecting portion 2b. As will be described later in detail, the connection portion 2b is provided with a negative pressure container side one-way valve 8.
The exhaust member 4 is for making the inside of the negative pressure container 2 into a negative pressure state, and is connected to the upper part of the negative pressure container 2 by projecting downward from the spherical compression part 4a having elasticity and the compression part 4a. And a cylindrical second opening 4c that communicates with the outside. An exhaust portion side one-way valve 7 is attached to the second opening 4c at the upper portion of the exhaust member 4.

The exhaust portion-side one-way valve 7 allows exhaust from the exhaust member 4 to the outside due to a change in pressure difference between the inside and the outside of the exhaust member 4 when the exhaust member 4 changes from the first state to the second state. Further, the exhaust portion side one-way valve 7 blocks intake from the outside to the exhaust member 4 due to a change in differential pressure between the inside and outside of the exhaust member 4 when the exhaust member 4 is restored from the second state to the first state. .
The configuration of the exhaust portion side one-way valve 7 is the same as that disclosed in Japanese Patent Laid-Open No. 2013-74914. Specifically, a flow passage is formed in the upper and lower sides of the exhaust-side one-way valve 7. The exhaust-side one-way valve 7 includes a float-shaped valve element (not shown) on the flow channel and a seat of the valve element. And a valve seat (not shown) which is a surface. Then, the flow passage is closed by coming into contact with the valve body by its own weight, the internal pressure of the exhaust member 4 is applied from below, and the valve body is separated from the valve seat, so that the flow passage is opened and the exhaust member is exhausted. 4 allows the exhaust from the inside to the outside.

<One-way valve on the negative pressure container side>
Next, details of the negative pressure container side one-way valve 8 will be described mainly with reference to FIGS. 2 to 4.
The negative pressure container side one-way valve 8 according to the present embodiment includes a first member (flexible wall 8a) that forms and closes an air flow path, and a second member (flexible wall 8b). 8a and the flexible wall 8b constitute a duckbill valve. More specifically, a slit 8c is formed above the one-way valve 8 on the negative pressure container side. The flexible wall 8a and the flexible wall 8b are symmetrical with respect to the slit 8c, and are formed so as to taper upward.
Thus, by adopting the duckbill valve as the one-side valve 8 on the negative pressure container side, the negative pressure container which communicates with the storage container 3 via the connecting tube 6 by sucking the drainage and storing it in the storage container 3 When the pressure of 2 increases, the one-way valve 8 on the negative pressure container side can be naturally opened.

The first member (flexible wall 8a) and the second member (flexible wall 8b) are arranged in a non-pressure contact state in the air flow path between the negative pressure container 2 and the exhaust unit (exhaust member 4). ing. Here, "disposed in a non-pressure contact state" means a state in which there is no pressure difference before and after the valve, in a state in which there is no pressure contact, and a state in which no pressure is applied as well as a state in which they are separated. Including the state of simply touching. In particular, when they are separated from each other, it is necessary to have flexibility to such an extent that the check function is not lost.
Since the one-way valve 8 on the negative pressure container side is provided in a non-pressure contact state, when the pressure of the negative pressure container 2 and the exhaust member 4 is increased by sucking the drained liquid, the one-way valve 8 on the negative pressure container side is provided. Also, the exhaust portion side one-way valve 7 can open the air to the atmosphere.

In particular, in the negative pressure container side one-way valve 8 according to the present embodiment, since the drainage is sucked by the medical suction device 1, the pressure on the negative pressure container 2 side is a positive pressure and the exhaust unit (exhaust member 4). ) Side, the air is allowed to be exhausted from the negative pressure container 2 to the exhaust member 4 when it reaches a predetermined value of 10 mmHg or less.
Further, when the pressure obtained by applying the pressure for opening the exhaust side one-way valve 7 and the pressure for opening the negative pressure container side one-way valve 8 is 14.7 mmHg or less, preferably 10 mmHg or less, the valve body of the exhaust side one-way valve 7 is Is suitable because it can be opened to the atmosphere by pushing up.

表１に示すように、陰圧容器側一方弁８が開く圧力が０である場合であっても、陰圧容器２の内部を陰圧にする機能を損なうわけではない。しかしながら、排気部材４を圧搾するときに、一部のエアが陰圧容器２の内部に逆流するため、陰圧容器２内を目標の陰圧状態にする効率が低くなる。
また、陰圧容器側一方弁８が開く圧力が２０mmHgである場合には、収容容器３に排液を収容したとしてもなかなか陰圧容器側一方弁８が開かず、収集速度が遅くなってしまう。
一方、陰圧容器側一方弁８が開く圧力が１０mmHg以下で、特に５mmHgである場合には、吸引箇所（患部）よりも低い高さ範囲で、収容容器３の高さを低くし、サイフォンの原理により収容容器３内の圧力を大きくしたときに陰圧容器側一方弁８を開かせることができる。
具体的には、一般的な患部高さから被験者の架台の上面との高低差である約２０ｃｍ低い位置に収容容器３を配設することにより、収容容器３内の圧力を大きくして陰圧容器側一方弁８を開かせることができる。例えば、比重１の排液の場合には、患部高さから２０ｃｍ低い位置に収容容器３があるときには、１４．７mmHgの圧力が収容容器３の内部に加わることになる。 Here, the pressure when the one-way valve 8 on the negative pressure container side is opened and closed (the pressure in the negative pressure container 2 with respect to the internal pressure of the exhaust member 4) will be described with reference to Table 1.

As shown in Table 1, even when the pressure at which the one-way valve 8 on the negative pressure container side is opened is 0, the function of making the inside of the negative pressure container 2 negative pressure is not impaired. However, when the exhaust member 4 is squeezed, a part of the air flows back into the negative pressure container 2, so that the efficiency of bringing the negative pressure container 2 into the target negative pressure state becomes low.
When the pressure at which the negative pressure container side one valve 8 is opened is 20 mmHg, even if the drainage is stored in the storage container 3, the negative pressure container side one valve 8 does not open easily and the collection speed becomes slow. .
On the other hand, when the pressure at which the one-way valve 8 on the negative pressure container side is opened is 10 mmHg or less, especially 5 mmHg, the height of the storage container 3 is lowered in the height range lower than the suction site (affected area), and the siphon According to the principle, when the pressure in the storage container 3 is increased, the one-way valve 8 on the negative pressure container side can be opened.
Specifically, by arranging the storage container 3 at a position that is about 20 cm lower than the height of the general affected area, which is the height difference from the upper surface of the pedestal of the subject, the pressure inside the storage container 3 is increased and the negative pressure is increased. The container-side one-way valve 8 can be opened. For example, in the case of drainage with a specific gravity of 1, when the container 3 is located 20 cm lower than the height of the affected area, a pressure of 14.7 mmHg is applied to the inside of the container 3.

It is preferable that an index is set for the operation amount (the number of operations) of squeezing the exhaust member 4 so that the drainage can be naturally discharged when the drainage is stored in the storage container 3 by a predetermined amount.
Regarding the index, specifically, the target degree of swelling of the balloon 5 should be indicated by a label having a note on the number of times the exhaust member 4 has been operated (for example, three times) or a diagram drawn on the negative pressure container 2. Etc.

<Modification>
In the above embodiment, the negative pressure container side one valve 8 using the duck bill valve has been described, but the present invention is not limited as long as the negative pressure container side one valve can be opened depending on the amount of drained liquid. Is not limited to such a configuration.
Next, the negative pressure container side one-way valve 18 according to the modification will be described mainly with reference to FIGS. 5 and 6. FIG. 5 is a cross-sectional view showing a negative pressure container side one-way valve 18 according to a modified example, showing a state in which the communication hole 19a is sealed, and FIG. 6 is a negative pressure container side one-way valve according to the modified example. 18 is a cross-sectional view showing 18 and showing a state in which a communication hole 19a is opened.

The negative pressure container-side one-way valve 18 according to the present modification includes a first member (main body member 19) and a second member (membrane member 20) that form and close an air flow path.
The first member is a main body member 19 having a communication hole 19a that connects the negative pressure container 2 and the exhaust unit (exhaust member 4).
Specifically, the main body member 19 is hollow and has a sharpened shape, and the communication hole 19 a extends in the horizontal direction with respect to the main body member 19, and the hollow space inside the main body member 19 and the outside (exhaust gas). It is a lateral hole that communicates with the inside of the member 4).
The second member is a film-shaped member 20 attached to the main body member 19, and closed the communication hole 19a when the pressure of the negative pressure container 2 increased due to the drainage being sucked by the medical suction device. From the state, the communication hole 19a is opened.
By adopting the film member 20 for the one-way valve 18 on the negative pressure container side, the film member 20 is opened so that the communication hole 19a is opened when the pressure of the negative pressure container 2 is increased by sucking the drainage. The valve can be opened by extending in the radial direction.

In particular, the first member (main body member 19) and the second member (membrane member 20) are arranged in a non-pressure contact state in the air flow path between the negative pressure container 2 and the exhaust portion (exhaust member 4). Has been done.
As described above, the one-way valve 18 on the negative pressure container side is provided in the non-pressure contact state, so that when the pressure of the negative pressure container 2 and the exhaust member 4 increases due to the suction of the drainage, the negative pressure container The side one-way valve 18 and the exhaust unit side one-way valve 7 can release air to the outside.

  The medical suction device 1 according to the above embodiment has been described as including the negative pressure container 2 and the storage container 3 separately, but the present invention has such a configuration as long as the negative pressure container side one-way valve is provided. Not limited. That is, the negative pressure container 2 and the storage container 3 may be integrally formed to form a negative pressure container.

The above embodiment includes the following technical ideas.
(1) A medical suction device for sucking drainage by negative pressure formed by a negative pressure container,
The negative pressure container,
The negative pressure container is connected to the negative pressure container, has elasticity, and is configured to be deformable into a first state and a second state squeezed from the first state, and exhausts air to the outside. With an exhaust part that can be made negative pressure,
A negative pressure container side one-way valve disposed between the negative pressure container and the exhaust unit,
An exhaust unit side one-way valve that is disposed between the exhaust unit and the outside, allows intake from the exhaust unit to the outside, and blocks intake from the outside to the exhaust unit;
The negative pressure container-side one-way valve allows the exhaust of the air from the negative pressure container to the exhaust part when the exhaust part restores from the second state to the first state, and the exhaust part Prevent the intake of air from the exhaust unit to the negative pressure container when the state changes from the first state to the second state,
The negative pressure container-side one-way valve is configured such that when the drainage is sucked by the medical suction device and the pressure of the negative pressure container increases, the exhaust unit is in the first state. A medical suction device, which allows the air to be exhausted from the exhaust unit to the exhaust unit.
(2) The negative pressure container-side one-way valve has a positive pressure on the negative pressure container side and a pressure of 10 mmHg or less than that on the exhaust portion side due to the drainage being sucked into the medical suction device. The medical suction device according to (1), which allows the air to be exhausted from the negative pressure container to the exhaust part when the value is increased to a value.
(3) The one-way valve on the negative pressure container side includes a first member and a second member that form and close the flow path of the air,
The first member is a main body member having a communication hole that communicates the negative pressure container and the exhaust unit,
The second member is
A film-shaped member attached to the main body member,
When the pressure of the negative pressure container is increased by sucking the drainage into the medical suction device, the communication hole is closed and the communication hole is opened (1) or (2). ) Medical suction device described in.
(4) The negative pressure container-side one-way valve includes a first member and a second member that form and close the flow path of the air,
The medical suction device according to (1) or (2), wherein the first member and the second member constitute a duckbill valve.
(5) In the (3) or (4), the first member and the second member are arranged in a non-contact state in the air flow path between the negative pressure container and the exhaust section. The medical suction device described.

1 Medical suction device 2 Negative pressure container 2a Cap 2b Connection part 3 Storage container 3a Suction port 3b Clamp member 3c Discharge port 4 Exhaust member (exhaust part)
4a Compressing part 4b 1st opening part 4c 2nd opening part 5 Balloon 6 Connecting tube 7 Exhaust part side one valve 8 Negative pressure container side one valve 8a Flexible wall (1st member)
8b Flexible wall (second member)
8c Slit 18 Negative pressure container side one-way valve 19 Main body member (first member)
19a Communication hole 20 Membrane member (second member)

Claims (5)

A medical suction device for sucking drainage liquid by negative pressure formed by a negative pressure container,
The negative pressure container,
The negative pressure container is connected to the negative pressure container, has elasticity, and is configured to be deformable into a first state and a second state squeezed from the first state, and exhausts air to the outside. With an exhaust part that can be made negative pressure,
A negative pressure container side one-way valve disposed between the negative pressure container and the exhaust unit,
An exhaust unit side one-way valve that is disposed between the exhaust unit and the outside, allows intake from the exhaust unit to the outside, and blocks intake from the outside to the exhaust unit;
The negative pressure container-side one-way valve allows the exhaust of the air from the negative pressure container to the exhaust part when the exhaust part restores from the second state to the first state, and the exhaust part Prevent the intake of air from the exhaust unit to the negative pressure container when the state changes from the first state to the second state,
The negative pressure container-side one-way valve is configured such that when the drainage is sucked by the medical suction device and the pressure of the negative pressure container increases, the exhaust unit is in the first state. A medical suction device, which allows the air to be exhausted from the exhaust unit to the exhaust unit.   The negative pressure container side one-valve increases the pressure on the negative pressure container side to a positive pressure, which is 10 mmHg or less than the exhaust portion side, by sucking the drainage into the medical suction device. The medical suction device according to claim 1, wherein the air is allowed to be exhausted from the negative pressure container to the exhaust portion when the suction device is opened. The negative pressure container side one-way valve includes a first member and a second member that form and close the flow path of the air,
The first member is a main body member having a communication hole that communicates the negative pressure container and the exhaust unit,
The second member is
A film-shaped member attached to the main body member,
When the pressure of the negative pressure container is increased by sucking the drainage into the medical suction device, the communication hole is closed and the communication hole is opened. The medical suction device described. The negative pressure container side one-way valve includes a first member and a second member that form and close the flow path of the air,
The medical suction device according to claim 1 or 2, wherein the first member and the second member constitute a duckbill valve.   The medical suction according to claim 3 or 4, wherein the first member and the second member are arranged in a non-pressure contact state in a flow path of the air between the negative pressure container and the exhaust unit. Equipment.

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