JP7521196B2 - Medical suction equipment - Google Patents

Description

The present invention relates to a medical suction device.

A medical suction instrument that sucks up drainage (body fluids) from a living organism through a tube includes a negative pressure container, an exhaust section connected to the negative pressure container and exhausting air from the inside to the outside when the container contracts due to a squeezing operation and sucking air from the negative pressure container when the container elastically restores, and a balloon disposed within the negative pressure container, the inside of which is connected to the outside air through pores formed in the negative pressure container, and the balloon expands as the negative pressure container becomes negative pressure.
Such a medical suction instrument is described, for example, in Japanese Patent Application Laid-Open No. 2003-233996.

JP 2013-74914 A

During the balloon expansion process, it is desirable for the balloon to expand as smoothly as possible into the desired shape.

The present invention was made in consideration of the above problems, and provides a medical suction device that allows the balloon to be smoothly inflated to a desired shape.

The present invention provides a medical suction instrument that uses negative pressure to suction drainage,
A negative pressure vessel;
an exhaust section connected to the negative pressure container, which exhausts air from the inside to the outside when the container is contracted by a squeezing operation and draws air from the negative pressure container when the container is elastically restored;
A balloon disposed within the negative pressure vessel;
Equipped with
The inside of the balloon is in communication with the outside air through a pore formed in the negative pressure container,
The balloon is inflated as the negative pressure container becomes negative pressure,
The medical suction instrument has an inner surface of the negative pressure container coated with oil.

According to the present invention, the balloon is prevented from getting caught on the inner surface of the negative pressure vessel, allowing the balloon to expand smoothly into the desired shape.

FIG. 2 is a front view of the medical suction instrument according to the embodiment, showing a state before exhaust from a negative pressure container. FIG. 2 is a front view of the medical suction instrument according to the embodiment, showing a state in which exhaust has been performed from the negative pressure container. 1A to 1C are front views of the medical suction instrument according to the embodiment, showing a state in which the balloon comes into contact with the inner surface of the negative pressure container during a series of exhaust operations. FIG. 3 is a cross-sectional plan view taken along line AA of FIG. 2 , showing the medical suction instrument according to the embodiment. 5(a), 5(b), 5(c) and 5(d) are partially enlarged views of the side wall of the negative pressure container in the embodiment. 6(a), 6(b), 6(c) and 6(d) are partially enlarged views of a balloon in the embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and the description thereof will be omitted as appropriate.
The embodiment described below is merely an example for facilitating understanding of the present invention, and is not intended to limit the present invention. In other words, the shapes, dimensions, arrangements, and other aspects of the components described below may be modified or improved without departing from the spirit of the present invention, and the present invention includes equivalents thereof.

As shown in Figures 1 to 6 (d), the medical suction instrument 100 of this embodiment is a medical suction instrument that uses negative pressure to suction drainage fluid, and includes a negative pressure container 10, an exhaust section 30 that is connected to the negative pressure container 10 and exhausts air from the inside to the outside when the container contracts due to a squeezing operation and sucks air from the negative pressure container 10 when the container elastically restores, and a balloon 20 that is disposed within the negative pressure container 10.
The inside of the balloon 20 is connected to the outside air through pores 18a formed in the negative pressure vessel 10, and the balloon 20 expands as the negative pressure vessel 10 becomes negative pressure, and oil 41 is applied to the inner surface 11a of the negative pressure vessel 10.

In the medical suction instrument 100, when the balloon 20 is inflated to a certain extent (when the inside of the negative pressure vessel 10 becomes negative pressure to a certain extent), the outer surface 21 of the balloon 20 comes into contact with the inner surface 11a of the negative pressure vessel 10 (see Figure 3). Then, when the inside of the negative pressure vessel 10 becomes even more negative pressure, the balloon 20 further inflates along the inner surface 11a of the negative pressure vessel 10 (see Figure 2).

In the present embodiment, the oil 41 improves the slipperiness (lubricity) of the inner surface 11a of the negative pressure container 10, thereby reducing the frictional force generated between the inner surface 11a and the outer surface 21. Therefore, the inner surface 11a and the outer surface 21 can slide smoothly against each other.
This prevents the outer surface 21 of the balloon 20 from getting caught on the inner surface 11a of the negative pressure vessel 10 inside the negative pressure vessel 10, and allows the balloon 20 to easily displace relative to the inner surface 11a in accordance with its own expansion. Therefore, the balloon 20 can smoothly expand to a desired shape.

This will be explained in more detail below.
Among Fig. 1 to Fig. 6(d), Fig. 1 shows the natural state of the balloon 20, and Fig. 2 shows the state in which the balloon 20 is maximally inflated. Fig. 3 shows the moment when the balloon 20 comes into contact with the inner surface 11a of the negative pressure vessel 10 during the process of the balloon 20 being maximally inflated from the natural state. Fig. 4 shows a plan view of the balloon 20 in the maximally inflated state. The maximally inflated state of the balloon 20 means a state in which the elastic restoring force of the exhaust section 30 and the pressure inside the negative pressure vessel 10 are in balance as shown in Fig. 2, and a pumping operation, which will be described later, is performed until the exhaust section 30 does not restore to its natural shape (see Fig. 1). Figs. 5(a) to 5(d) are cross-sectional views of one of the side wall sections 53 to 56 of the negative pressure vessel 10, which will be described later, is cut in the thickness direction. Figs. 6(a) to 6(d) are cross-sectional views of the balloon 20 cut in the thickness direction with a portion of the balloon 20 flattened.
In the following, the "vertical direction" refers to the vertical direction when the medical suction instrument 100 is placed in the orientation shown in Figures 1 to 3. More specifically, the medical suction instrument 100 is capable of standing on its own when placed on a horizontal placement surface in the position shown in Figures 1 to 3.

1 to 4, the shape of the negative pressure vessel 10 is not particularly limited, but the negative pressure vessel 10 (container body 11 described below) is formed, for example, in a rectangular parallelepiped shape. Note that the rectangular parallelepiped here means that there are three pairs of opposing surfaces, and each adjacent surface is approximately perpendicular to each other.
The negative pressure vessel 10 includes, for example, a top plate 51 and a bottom plate 52 that are arranged horizontally, and four side walls 53, 54, 55, and 56 that are perpendicular to each of the top plate 51 and the bottom plate 52. The top plate 51, the bottom plate 52, and the side walls 53 to 56 are each formed, for example, in a plate shape.
As shown in Fig. 1, the side wall portion 53 and the side wall portion 54 are disposed opposite to each other. Also, as shown in Fig. 4, the side wall portion 55 and the side wall portion 56 are disposed opposite to each other and are perpendicular to the side wall portion 53 and the side wall portion 54.
Here, the inner surface 11a of the negative pressure vessel 10 includes, for example, the inner surface of the top plate 51 (hereinafter referred to as the top surface 51a) and the inner surface of the bottom plate 52 (hereinafter referred to as the bottom surface 52a), as well as the inner surfaces of each side wall portion 53 to 56 (hereinafter referred to as the side surfaces 53a, 54a, 55a, 56a).

The negative pressure container 10 is configured, for example, to include a container body 11 and a cap 18 attached to the upper end of the container body 11.
As shown in Figs. 1 to 4, the container body 11 (negative pressure container 10) is formed in, for example, a rectangular parallelepiped shape as described above.
A first mouth-neck portion 11b and a second mouth-neck portion 11c are formed on the top plate 51 of the container body 11, and each of the first mouth-neck portion 11b and the second mouth-neck portion 11c has an axial direction extending in the up-down direction.
The first mouth-neck portion 11b is formed in a cylindrical shape and protrudes upward from the top plate 51 of the container body 11. The internal space of the first mouth-neck portion 11b communicates with the internal space of the container body 11 via an opening on the base end (lower end) side of the first mouth-neck portion 11b. The first mouth-neck portion 11b has a screw thread formed on its outer circumferential surface, and the first mouth-neck portion 11b has a male screw shape.
The cap 18 is a screw cap. The cap 18 is configured to include a cylindrical portion and a flat blocking portion that blocks one end side in the axial direction of the cylindrical portion. A screw thread that screws with the first mouth-neck portion 11b is formed on the inner peripheral surface of the cylindrical portion. The cap 18 is detachably attached to the first mouth-neck portion 11b by screwing the cylindrical portion with the first mouth-neck portion 11b. As a result, the opening at the tip (upper end) of the first mouth-neck portion 11b is blocked by the cap 18. The blocking portion of the cap 18 has a fine hole 18a that penetrates the blocking portion from top to bottom.
A retaining tube portion 18b that retains the balloon 20 is formed in the occluding portion of the cap 18. The retaining tube portion 18b is formed to have a smaller diameter than the tubular portion of the cap 18 and is arranged coaxially with the tubular portion, and hangs downward from the occluding portion of the cap 18. In a plan view, a fine hole 18a is arranged in the inner range of the retaining tube portion 18b.
The second mouth-neck portion 11c is formed in a cylindrical shape and protrudes upward from the top plate of the container body 11. The internal space of the second mouth-neck portion 11c communicates with the internal space of the container body 11 via an opening on the base end (lower end) side of the second mouth-neck portion 11c. The second mouth-neck portion 11c is provided with a one-way valve 32. The second mouth-neck portion 11c is closed by the one-way valve 32.

Here, in the negative pressure vessel 10 (vessel body 11), the boundaries between each of the top plate 51 and the bottom plate 52 and each of the side wall portions 53 to 56 are, for example, chamfered around the entire circumference. Therefore, the boundaries between each of the top surface 51a and the bottom surface 52a and each of the side surfaces 53a to 56a are, for example, chamfered around the entire circumference. In addition, the boundaries between each of the side wall portions 53 to 56 are, for example, chamfered. Therefore, the boundaries between each of the side surfaces 53a to 56a are, for example, chamfered.
Furthermore, the eight corners of the negative pressure container 10 (container body 11) may be rounded, for example.

Furthermore, the negative pressure vessel 10 includes, for example, a suction side tube 14 provided on the top plate 51 of the vessel body 11, a connector 16 connected to the suction side tube 14, and a clamp member 15 attached to the suction side tube 14.
The suction side tube 14 is a flexible tube, and the internal space of the suction side tube 14 communicates with the internal space of the container body 11. A cylindrical connector 16 is provided at the tip (upper end) of the suction side tube 14. The internal space of the connector 16 communicates with the internal space of the suction side tube 14. A suction port 16a is formed at the tip (upper end) of the connector 16.
The clamp member 15 is formed in a plate shape that is long in one direction. A slit extending in the longitudinal direction of the clamp member 15 is formed in the clamp member 15. The suction side tube 14 is inserted into the slit, and the clamp member 15 is held by the suction side tube 14.
A portion of the slit of the clamp member 15 is a wide portion that is formed relatively wide, and the remaining portion of the slit is a narrow portion that is formed relatively narrow. The wide portion and the narrow portion are disposed contiguously with each other.
By sliding the clamp member 15 relative to the suction side tube 14 so that the suction side tube 14 passes through the wide portion of the slit, the flow path inside the suction side tube 14 is opened, and the suction port 16a communicates with the internal space of the container body 11 via the connector 16 and the suction side tube 14. By sliding the clamp member 15 relative to the suction side tube 14 so that the suction side tube 14 passes through the narrow portion of the slit, the suction side tube 14 is clamped by the clamp member 15, the flow path inside the suction side tube 14 is closed, the suction port 16a and the internal space of the container body 11 are mutually isolated, and the internal space of the negative pressure container 10 is in a closed state isolated from the outside.
On the top surface of the container body 11, at a position different from the position where the suction side tube 14, the first mouth-neck portion 11b and the second mouth-neck portion 11c are provided, an outlet 12a is formed for discharging waste liquid after use of the medical suction instrument 100.
The outlet 12a is fitted with an outlet cap 17 that can open and close the outlet 12a. Normally, the outlet 12a is closed by the outlet cap 17.
The discharge port 12a may not be formed in the container body 11. In this case, for example, with the cap 18 (and the balloon 20) removed from the first mouth neck portion 11b, the drainage liquid may be discharged to the outside from the opening at the tip of the first mouth neck portion 11b.
Furthermore, the container body 11 may be provided with a scale for checking the amount of liquid collected in the container body 11 by suction (collected liquid amount), for example.

The container body 11 is made of, for example, a transparent (transparent to visible light) resin material. Transparent resin materials are not particularly limited, but examples include rigid polyvinyl chloride resin, polyester-based resins such as polyethylene terephthalate, styrene-based resins such as acrylonitrile-styrene copolymer resin, and polyolefin-based resins such as polypropylene (PP) and PE.

The balloon 20 is made of an elastic material that can expand and contract. The material of the balloon 20 is preferably a rubber material such as natural rubber, isoprene rubber, or chloroprene rubber, or a thermoplastic elastomer material such as a styrene-based thermoplastic elastomer such as a styrene-butadiene copolymer or a styrene-isoprene copolymer, an olefin-based thermoplastic elastomer, an amide-based elastomer, or a polyester-based elastomer.
The hardness (JIS hardness) of the material of the balloon 20 is not particularly limited, but is preferably, for example, 20 degrees or more and 50 degrees or less. In the case of the present embodiment, the hardness of the material constituting the balloon 20 is, for example, about 30 degrees. Here, the JIS hardness is a value measured by a method using a durometer specified in JIS K 6253 as a measuring instrument.
The thickness of the balloon 20 is not particularly limited, but is preferably, for example, 0.2 mm or more and 0.6 mm or less In the case of the present embodiment, the thickness of the balloon 20 is, for example, about 0.4 mm.
The longitudinal dimension of the balloon 20 is, for example, not less than 40 mm and not more than 80 mm, and the radial dimension perpendicular to the longitudinal direction is, for example, not less than 15 mm and not more than 30 mm.

The shape of the balloon 20 is not particularly limited, but for example, it is formed in a cylindrical shape with one end (upper end) open and the other end closed, and the shape before inflation (see FIG. 1) is long vertically. The holding tube portion 18b of the cap 18 is inserted from the opening on the upper end side of the balloon 20, and the balloon 20 is airtightly attached to the holding tube portion 18b. The balloon 20 is held by the holding tube portion 18b.
The internal space of the balloon 20 is connected to the external space of the negative pressure vessel 10 via the fine hole 18a of the cap 18.

As shown in Figures 2, 3, and 4, when the balloon 20 is in the process of expanding from its natural state (the cylindrical shape shown in Figure 1) to its maximum expansion, the center of the top surface 51a, the center of the bottom surface 52a, and the centers of each of the four side surfaces 53a to 56a are mainly in contact with the balloon 20.
In addition, when the balloon 20 is in a maximum expansion state, further expansion of the balloon 20 is restricted by the inner surface 11a of the negative pressure vessel 10 (container body 11), so the balloon 20 inflates to a shape that conforms to the inner surface 11a of the negative pressure vessel 10 and is in close contact with the inner surface 11a of the negative pressure vessel 10 (see FIG. 2). More specifically, for example, the balloon 20 is in close contact with the negative pressure vessel 10 (container body 11) except for the eight corners (corners), excluding the location where the first neck portion 11b is formed, the location where the second neck portion 11c is formed, the connection portion with the suction side tube 14, and the location where the exhaust port 12a is formed. More specifically, as shown in FIGS. 2 and 4, when the balloon 20 is in a maximum expansion state, for example, gaps 61 to 66 (some gaps are not shown) are formed between the inner surface 11a of the negative pressure vessel 10 and the outer surface 21 of the balloon 20 near the eight corners (corners) of the negative pressure vessel 10. However, when the balloon 20 is in a maximally expanded state, for example, each of the gaps 61 to 66 may not be formed, and the balloon 20 may be in close contact with the eight corners (corners) of the negative pressure vessel 10.

The exhaust unit 30 is configured to include, for example, a hollow squeezing member 31 that receives a squeezing operation, and a one-way valve 33 that is provided at the boundary between the squeezing member 31 and the outside space. The squeezing operation is performed by the operator squeezing the squeezing member 31 by hand.
The compression member 31 has, for example, a substantially spherical shape in its natural state (FIG. 1) before the compression operation is performed. The compression member 31 elastically deforms (contracts) when compressed, and returns to its original shape by elastic restoring force when the compression operation is released.
The compressing member 31 has, for example, a lower mouth-neck portion 31c formed at the lower end of the compressing member 31 and an upper mouth-neck portion 31d formed at the upper end of the compressing member 31. The lower mouth-neck portion 31c and the upper mouth-neck portion 31d are each formed in a cylindrical shape with the axial direction extending in the vertical direction.
The upper mouth-neck portion 31d is provided with a one-way valve 33, and the upper mouth-neck portion 31d is closed by the one-way valve 33. The one-way valve 33 allows exhaust from the inside of the compressing member 31 to the outside (outside of the medical suction instrument 100), while restricting the inflow of outside air from the outside of the compressing member 31 (outside of the medical suction instrument 100) to the inside of the compressing member 31.
The second mouth neck portion 11c of the container body 11 is press-fitted into the lower mouth neck portion 31c of the squeezing member 31, and the squeezing member 31 is airtightly attached to the container body 11. As a result, a one-way valve 32 is disposed at the boundary between the internal space of the container body 11 and the internal space of the squeezing member 31.
The one-way valve 32 allows the intake of air from inside the container body 11 to inside the compressing member 31 , while restricting the backflow of gas from inside the compressing member 31 to inside the container body 11 .
It is also preferable that a fastener such as a cable tie is provided around the lower mouth neck portion 31c.
The material of the compression member 31 is not particularly limited, but may be, for example, natural rubber or synthetic rubber such as isoprene rubber or silicone rubber.

Here, one cycle of exhaust operation is when the compression member 31 of the exhaust section 30 is compressed once to cause the compression member 31 to contract, and when the compression operation is released, the compression member 31 elastically restores once. In addition, the operation by the operator to perform the exhaust operation is called a pumping operation.

The drainage liquid aspirated by the medical suction instrument 100 is stored in the container body 11 .
In order to prevent the bodily fluid inlet port (the portion communicating with the suction side tube 14) on the top surface of the container body 11 and the exhaust port (the base end of the second mouth neck portion 11c) to the squeezing member 31 of the exhaust section 30 from being blocked by the balloon 20, it is also preferable that grooves (not shown) are formed around the bodily fluid inlet port and the exhaust port on the inner surface of the container body 11. It is preferable that the groove surrounds, for example, the periphery of the bodily fluid inlet port and the periphery of the exhaust port in a circular manner.
It is also preferable that the suction side tube 14 is disposed near a corner of the container body 11. The location where a gap first occurs between the balloon 20 and the inner surface of the container body 11 when the balloon 20 contracts is near the corner of the container body 11, so by providing the suction side tube 14 near the corner (for example, near the outlet 12a), a space for the drainage liquid to enter into the container body 11 can be easily secured from the start of the suction operation.
It is more preferable that grooves are formed around the bodily fluid inlet and exhaust port, and that the suction side tube 14 is disposed near a corner of the container body 11 .

To suck drainage (body fluid) from a living body using the medical suction instrument 100, first, with the suction side tube 14 blocked by the clamp member 15, one end of a tube (not shown) having been inserted into the living body is connected to the connector 16.
Next, the exhaust operation (the pumping operation described above) is repeatedly performed on the compression member 31 of the exhaust section 30, and the air inside the negative pressure vessel 10 is exhausted to the outside of the medical suction instrument 100, thereby creating a negative pressure inside the negative pressure vessel 10.
When the squeezing member 31 of the exhaust section 30 contracts due to the squeezing operation, the air inside the squeezing member 31 is exhausted to the outside of the medical suction instrument 100 via the one-way valve 33. When the squeezing operation is released and the squeezing member 31 elastically restores, the air inside the container body 11 is introduced (sucked) into the inside of the squeezing member 31 via the one-way valve 32.
As the pressure inside the negative pressure vessel 10 becomes negative, the balloon 20 expands inside the vessel body 11 (see FIG. 2). The internal space of the balloon 20 communicates with the external space of the medical suction instrument 100 via the internal space of the retaining tube portion 18b and the fine hole 18a, so that when the balloon 20 expands, outside air is introduced into the balloon 20. As described above, the balloon 20 comes into contact with the inner surface 11a of the vessel body 11 during the process of expanding the balloon 20 from its natural state to its maximum expansion (see FIGS. 3 and 4).
The compression operation of the compression member 31 and its release are repeated until the elastic restoring force of the compression member 31 and the pressure inside the negative pressure vessel 10 are balanced, thereby completing a series of exhaust operations.

Next, the suction side tube 14 is opened by the clamp member 15, whereby the drainage liquid can be sucked from the living body. That is, the drainage liquid passes through a tube (not shown), the connector 16, and the suction side tube 14 in this order, and is sucked into the container body 11. The sucked drainage liquid is stored in the container body 11. In this way, for example, blood, exudate, and the like can be drained from a wound in the human body.
In the process of aspirating the drainage liquid, the pressure inside the negative pressure container 10 (the pressure inside the container body 11) gradually approaches atmospheric pressure. In other words, the suction pressure gradually weakens. In addition, in the process of aspirating the drainage liquid, the balloon 20 gradually deflates.
During the exhaust operation, it is not always necessary to close the suction side tube 14 with the clamp member 15. Also, the suction can be interrupted by closing the suction side tube 14 with the clamp member 15 during the suction of the drainage liquid.

In this embodiment, oil 41 is applied to at least the center of each of the four side surfaces 53a to 56a of the negative pressure container 10 (container body 11).
This improves the slipperiness at least in the center of each of the four side surfaces 53a to 56a. In other words, each of the four side surfaces 53a to 56a improves the slipperiness mainly at the portion that comes into contact with the balloon 20. This makes it possible to more effectively prevent the balloon 20 from getting caught on the inner surface 11a.
The central portions of the side surfaces 53a to 56a referred to here are portions excluding at least the peripheral portions of the side surfaces 53a to 56a.

Preferably, the oil 41 is applied to substantially the entire surface of each of the four side surfaces 53a to 56a of the negative pressure vessel 10 (vessel body 11).
This provides good slipperiness over substantially the entire surface of each of the four side surfaces 53a to 56a.
Therefore, no matter where the balloon 20 comes into contact with the inner surface 11a of the negative pressure vessel 10 due to expansion, the balloon 20 is prevented from getting caught on the inner surface 11a, and the balloon 20 can expand smoothly into the desired shape.
The entire surface of each side surface 53a to 56a means a planar portion excluding the boundary portion between the side surfaces 53a to 56a (the portion having the above-mentioned chamfered shape). The oil 41 may or may not be applied to the boundary portion between the side surfaces 53a to 56a. More specifically, the oil 41 may or may not be applied to the portions of the inner surface 11a corresponding to the gaps 61 to 66 (portions not in contact with the maximally inflated balloon 20).

More preferably, the oil 41 is applied to at least the center of the top surface 51a of the negative pressure vessel 10 (vessel body 11).
As a result, when the balloon 20 is inflated and comes into contact with the top surface 51a, the balloon 20 is prevented from getting caught on the top surface 51a, and the balloon 20 can be smoothly inflated into the desired shape.
In this case, the central portion of the top surface 51a refers to the peripheral edge portion of the first mouth-neck portion 11b, i.e., the portion excluding the area where the opening of the first mouth-neck portion 11b on the negative pressure vessel 10 side is formed and the boundary portions between the top surface 51a and each of the side surfaces 53a to 56a.
It is also preferable that oil 41 is applied to at least the center of the bottom surface 52a of the negative pressure vessel 10 (vessel body 11).
This prevents the balloon 20 from getting caught on the bottom surface 52a when the balloon 20 comes into contact with the bottom surface 52a, allowing the balloon 20 to expand smoothly into the desired shape.

Furthermore, in this embodiment, fine powder 42 of an inorganic material is applied to the inner surface 11a of the negative pressure vessel 10 (vessel body 11).
As a result, the slipperiness of the inner surface 11a is further improved by the fine powder 42, and the frictional force generated between the outer surface 21 and the inner surface 11a is further reduced.
Therefore, the balloon 20 is prevented from getting caught on the inner surface 11a inside the negative pressure vessel 10, so that the balloon 20 can be more smoothly displaced relative to the inner surface 11a in accordance with the expansion of the balloon 20. Therefore, the balloon 20 can be more smoothly expanded to a desired shape.

Preferably, the fine powder 42 is applied to at least the center of each of the four side surfaces 53a to 56a of the negative pressure vessel 10 (vessel body 11).
This further improves the slipperiness at least in the central portion of each of the four side surfaces 53a to 56a. In other words, the slipperiness of the portions of each of the four side surfaces 53a to 56a that mainly come into contact with the balloon 20 is further improved.
This more effectively prevents the balloon 20 from getting caught on the inner surface 11a.
The central portions of the side surfaces 53a to 56a referred to here are portions excluding at least the peripheral portions of the side surfaces 53a to 56a.

More preferably, the fine powder 42 is applied to substantially the entire surface of each of the four side surfaces 53a to 56a of the negative pressure container 10 (container body 11).
As a result, regardless of where the balloon 20 comes into contact with the inner surface 11a of the negative pressure vessel 10 during the process of the balloon 20 expanding from its natural state to its maximum expansion, the balloon 20 is prevented from getting caught on the inner surface 11a, and the balloon 20 can expand smoothly to the desired shape.
The entire surface here means the planar portion of each of the side surfaces 53a to 56a excluding the boundary portions (the chamfered portions) between the side surfaces 53a to 56a. Therefore, the fine powder 42 may or may not be applied to the boundary portions between the side surfaces 53a to 56a. More specifically, the fine powder 42 may or may not be applied to the portions of the inner surface 11a of the negative pressure vessel 10 corresponding to the gaps 61 to 68 (portions not in contact with the maximally inflated balloon 20).

More preferably, the fine powder 42 is applied to at least the center of the top surface 51a of the negative pressure vessel 10 (vessel body 11).
This prevents the balloon 20 from getting caught on the top surface 51a when the balloon 20 expands, allowing the balloon 20 to expand more smoothly into the desired shape.
In this case, the central portion of the top surface 51a refers to the portion including the peripheral edge of the first mouth-neck portion 11b, excluding the location where the opening of the first mouth-neck portion 11b on the negative pressure vessel 10 side is formed, and the boundary portions between the top surface 51a and each of the side surfaces 53a to 56a.
It is also preferable that the fine powder 42 is applied to at least the center of the bottom surface 52a of the negative pressure vessel 10 (vessel body 11).
This prevents the balloon 20 from getting caught on the bottom surface 52a, allowing the balloon 20 to expand more smoothly into the desired shape.

In this embodiment, it is preferable that oil 41 is applied to at least one of the side surfaces 53a to 56a and the top surface 51a, and that fine powder 42 is applied to the surface and within the area where the oil 41 is applied.

In the present invention, the method of applying oil 41 to the inner surface 11a of the negative pressure vessel 10 is not particularly limited, but for example, the oil 41 can be applied to the inner surface 11a of the negative pressure vessel 10 using an application tool such as a brush (not shown).
Similarly, in the present invention, the method of applying the fine powder 42 to the inner surface 11a of the negative pressure vessel 10 is not particularly limited, but the fine powder 42 can be applied to the inner surface 11a by sprinkling the fine powder 42 on the inner surface 11a.
Furthermore, in the present invention, a mixture obtained by mixing the oil 41 and the fine powder 42 may be applied to the inner surface 11a using an application tool (not shown) such as a brush.
Furthermore, in the present invention, it is sufficient that at least the oil 41 is applied to the inner surface 11a of the negative pressure vessel 10, and the fine powder 42, for example, does not have to be applied to the inner surface 11a.
For example, oil 41 and fine powder 42 may be applied in advance to the outer surface 21 of the balloon 20, and the balloon 20 may be brought into contact with the inner surface 11a of the negative pressure vessel 10, thereby transferring (applying) the oil 41 and fine powder 42 to the inner surface 11a.

As shown in FIGS. 5(a) to 5(d), the oil 41 is applied in the form of a film in close contact with the inner surface 11a, for example.
Furthermore, the position of the fine powder 42 relative to the oil 41 on the inner surface 11a is not particularly limited as long as the fine powder 42 is well applied to the inner surface 11a.
More specifically, as shown in Fig. 5(a), the fine powder 42 may be mixed with the fine powder 42 covered by the oil 41 and the fine powder 42 exposed to the outside from the surface of the oil 41, or as shown in Fig. 5(b), all the fine powder 42 may be entirely covered by the oil 41. As shown in Fig. 5(c), all or some of the fine powder 42 may be in contact with the inner surface 11a, or may not be in contact with the inner surface 11a. Furthermore, as shown in Fig. 5(d), a part of all the fine powder 42 may be exposed to the outside from the surface of the oil 41, and the other part of the fine powder 42 may be covered by the oil 41.
That is, on the inner surface 11a, all or a part of the fine powder 42 may be in contact with the inner surface 11a, or may not be in contact with the inner surface 11a.

Furthermore, in this embodiment, the outer surface 21 of the balloon 20 is coated with the same type of oil 41 as that coated on the inner surface 11 a of the negative pressure vessel 10 .
As a result, the oil 41 applied to the outer surface 21 of the balloon 20 provides good slipperiness, and thus the balloon 20 is more effectively prevented from getting caught on the inner surface 11a when the balloon 20 is inflated, so that the balloon 20 can be more easily inflated to a desired shape.
Furthermore, by using the same type of oil 41 as that applied to the inner surface 11a, the medical suction instrument 100 according to this embodiment can be easily manufactured. However, the oil 41 applied to the outer surface 21 may be a different type of oil from that applied to the inner surface 11a.
The oil 41 is preferably applied, for example, to substantially the entire surface of the outer surface 21 of the balloon 20. This makes it possible to suitably prevent the balloon 20 from getting caught on the inner surface 11a, regardless of which part of the balloon 20 comes into contact with the inner surface 11a.
However, the oil 41 may be applied to a portion of the outer surface 21 of the balloon 20 (preferably mainly the portion that comes into contact with the inner surface 11a).

In addition, in this embodiment, the outer surface 21 of the balloon 20 is coated with the same type of fine powder 42 as that coated on the inner surface 11 a of the negative pressure vessel 10 .
As a result, the fine powder 42 is applied to the outer surface 21 of the balloon 20, which further improves the slipperiness of the outer surface 21. Therefore, when the balloon 20 expands, the balloon 20 is more effectively prevented from getting caught on the inner surface 11a, and the balloon 20 can expand more smoothly into a desired shape.
Furthermore, by using the same type of fine powder 42 as that applied to the inner surface 11a, the medical suction instrument 100 according to this embodiment can be easily manufactured. However, the fine powder 42 applied to the outer surface 21 may be a different type of fine powder from that applied to the inner surface 11a.
The fine powder 42 is preferably applied, for example, to substantially the entire surface of the outer surface 21 of the balloon 20. This makes it possible to suitably prevent the balloon 20 from getting caught on the inner surface 11a, regardless of which part of the balloon 20 comes into contact with the inner surface 11a.
However, the fine powder 42 may be applied to a portion of the outer surface 21 of the balloon 20 (preferably mainly the portion in contact with the inner surface 11a).

In the present invention, the method of applying the oil 41 to the outer surface 21 of the balloon 20 is not particularly limited, but the oil 41 can be applied to the outer surface 21 by, for example, immersing the balloon 20 in the oil 41.
In addition, in the present invention, the method of applying the fine powder 42 to the outer surface 21 of the balloon 20 is not particularly limited, but for example, the fine powder 42 can be applied to the outer surface 21 of the balloon 20 by sprinkling the fine powder 42 on the outer surface 21.
In the present invention, it is sufficient that at least the oil 41 is applied to the outer surface 21 of the balloon 20, and for example, the fine powder 42 does not have to be applied to the outer surface 21.

As shown in FIGS. 6( a ) to 6 ( d ), the oil 41 is applied to the outer surface 21 of the balloon 20 in the form of a coating that is in close contact with the outer surface 21 .
Furthermore, the position of the fine powder 42 relative to the oil 41 on the outer surface 21 is not particularly limited, so long as the fine powder 42 is applied to the outer surface 21 in a good condition.
More specifically, as shown in Fig. 6(a), the fine powder 42 covered by the oil 41 and the fine powder 42 exposed to the outside from the surface of the oil 41 may be mixed, or as shown in Fig. 6(b), all the fine powder 42 may be entirely covered by the oil 41. As shown in Fig. 6(c), all the fine powder 42 or a part of the fine powder 42 may be in contact with the outer surface 21, or may not be in contact with the outer surface 21. Furthermore, as shown in Fig. 6(d), a part of all the fine powder 42 may be exposed to the outside from the surface of the oil 41, and the other part of the fine powder 42 may be covered by the oil 41.
That is, on the outer surface 21 , all or a portion of the fine powder 42 may be in contact with the outer surface 21 , or may not be in contact with the outer surface 21 .

The oil 41 may be, for example, a silicone oil such as dimethyl silicone oil, but is not limited to silicone oil, and may be an ester oil, a fluorine oil, a vegetable oil such as olive oil or castor oil, or an animal oil such as liquid lanolin.
In addition, the oil 41 may contain, for example, additives, etc. Furthermore, the state of the oil 41 is not limited to semi-solid grease, and may be liquid.

Furthermore, the fine powder 42 is preferably, for example, an inorganic material, and an example of such an inorganic material is finely ground talc (talcum powder). As an example, the finely ground talc is, for example, hydrated magnesium silicate (average particle size 9.0 μm), has a monoclinic crystal structure, and has a Mohs hardness of 1. However, the oil 41 is not limited to finely ground talc, and may be silica, calcium carbonate, silicone powder, cellulose powder, acrylic resin powder, nylon powder, etc.

In addition, in the medical suction instrument 100 according to this embodiment, the arrangement of the exhaust section 30 on the top surface of the container body 11, the volume of the negative pressure container 10, the volume of the container body 11, whether or not oil is applied to the outer surface 21 of the balloon 20 and the inner surface 11a of the container body 11, the amount of oil applied, the dimensions of the pores 18a, whether or not talc is applied to the outer surface of the balloon 20, and the amount of talc applied, can be appropriately set.

The present invention is not limited to the above-described embodiment, and includes various modifications and improvements as long as the object of the present invention is achieved.
For example, in the above embodiment, an example was described in which the negative pressure vessel 10 is composed of a single container, but the negative pressure vessel 10 may also be composed of two containers, a first container and a second container.
When the negative pressure container 10 includes a first container and a second container, for example, the first container is provided with a cap 18, a balloon 20, and an exhaust unit 30, and the second container is provided with a suction side tube 14 and a connector 16, and an outlet 12a is formed. In this case, the medical suction instrument 100 includes, for example, a connecting tube that connects the internal space of the first container to the internal space of the second container. The balloon 20 is inflated inside the first container, and the drainage liquid is stored in, for example, the second container.
The negative pressure vessel 10 may also be configured to include three or more vessels that are in communication with each other.

The present embodiment encompasses the following technical ideas.
(1) A medical suction instrument that uses negative pressure to aspirate drainage fluid,
A negative pressure vessel;
an exhaust section connected to the negative pressure container, which exhausts air from the inside to the outside when the container is contracted by a squeezing operation and draws air from the negative pressure container when the container is elastically restored;
A balloon disposed within the negative pressure vessel;
Equipped with
The inside of the balloon is in communication with the outside air through a pore formed in the negative pressure container,
The balloon is inflated as the negative pressure container becomes negative pressure,
A medical suction instrument, wherein oil is applied to the inner surface of the negative pressure container.
(2) The medical suction instrument according to (1), wherein the negative pressure container is formed in a rectangular parallelepiped shape, and the oil is applied to at least the center of each of the four sides.
(3) The medical suction instrument according to (2), wherein the oil is applied to substantially the entire surface of each of the four sides.
(4) The medical suction instrument according to any one of (1) to (3), wherein the negative pressure container is formed in a rectangular parallelepiped shape, and the oil is applied to at least the center of the top surface.
(5) A medical suction instrument described in any one of (1) to (4), wherein the outer surface of the balloon is coated with the same type of oil as that coated on the inner surface of the negative pressure container.
(6) A medical suction instrument described in any one of (1) to (5), in which a fine powder of an inorganic material is applied to the inner surface of the negative pressure container.
(7) The medical suction instrument according to (6), wherein the negative pressure container is formed in a rectangular parallelepiped shape, and the fine powder is applied to at least the center of each of the four sides.
(8) The medical suction instrument according to (7), wherein the fine powder is applied to substantially the entire surface of each of the four sides.
(9) A medical suction instrument according to (7) or (8), wherein the negative pressure container is formed in a rectangular parallelepiped shape, and the fine powder is applied to at least the center of the top surface.
(10) A medical suction instrument described in any one of (6) to (9), wherein the outer surface of the balloon is coated with the same type of fine powder as that coated on the inner surface of the negative pressure container.

10 Negative pressure container 11 Container body 11a Inner surface 11b First mouth neck portion 11c Second mouth neck portion 12a Discharge port 14 Suction side tube 15 Clamp member 16 Connector 16a Suction port 17 Discharge port cap 18 Cap 18a Fine hole 18b Holding tube portion 20 Balloon 21 Outer surface 30 Exhaust portion 31 Compression member 31c Lower mouth neck portion 31d Upper mouth neck portion 32, 33 One-way valve 41 Oil 42 Fine powder 51 Top plate 51a Top surface 52 Bottom plate 52a Bottom surface 53-56 Side portion 53a-56a Side surface 61-66 Space 100 Medical suction instrument

Claims (9)

A medical suction instrument that uses negative pressure to aspirate drainage fluid,
A negative pressure vessel;
an exhaust section connected to the negative pressure container, which exhausts air from the inside to the outside when the container is contracted by a squeezing operation and draws air from the negative pressure container when the container is elastically restored;
A balloon disposed within the negative pressure vessel;
Equipped with
The inside of the balloon is in communication with the outside air through a pore formed in the negative pressure container,
The balloon is inflated as the negative pressure container becomes negative pressure,
The inner surface of the negative pressure vessel is coated with oil and fine powder of an inorganic material ,
A medical suction instrument having the fine powder applied within an application area of the oil . The medical suction device according to claim 1, wherein the negative pressure container is formed in a rectangular parallelepiped shape, and the oil is applied to at least the center of each of the four sides. The medical suction device according to claim 2, wherein the oil is applied to substantially the entire surface of each of the four sides. The medical suction device according to any one of claims 1 to 3, wherein the negative pressure container is formed in a rectangular parallelepiped shape, and the oil is applied to at least the center of the top surface. The medical suction device according to any one of claims 1 to 4, wherein the outer surface of the balloon is coated with the same type of oil as that coated on the inner surface of the negative pressure container. The medical suction instrument according to any one of claims 1 to 5, wherein the negative pressure container is formed in a rectangular parallelepiped shape, and the fine powder is applied to at least the center of each of the four sides. 7. The medical suction instrument of claim 6 , wherein said fine powder is applied to substantially the entire surface of each of said four sides. 8. The medical suction instrument according to claim 6 , wherein the negative pressure container is formed in a rectangular parallelepiped shape, and the fine powder is applied to at least the center of the top surface. The medical suction instrument according to any one of claims 1 to 8 , wherein the outer surface of the balloon is coated with the same type of fine powder as that coated on the inner surface of the negative pressure container.

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