JP2021101895A - Medical suction device - Google Patents

Abstract

To suck drainage with more uniform suction pressure.SOLUTION: A medical suction device for sucking drainage with negative pressure comprises: a negative pressure container; an exhaustion part which is connected to the negative pressure container to exhaust air from the inside to the outside in contraction by a compression operation and to suck air from the negative pressure container in elastic restoration; and a balloon disposed in the negative pressure container. The inside of the balloon communicates with the ambient air through pores made at the negative pressure container such that the balloon is dilated with decompression of the negative pressure container. With once contraction and elastic restoration of the exhaustion part as an exhaustion operation of one cycle, concerning a profile obtained by plotting the transition of the suction pressure of the negative pressure container of each cycle in a case where exhaustion operations of a plurality of cycles are performed to reach a balance point of the elastic restoration force of the exhaustion part and the pressure inside the negative pressure container, the suction pressure shows a maximum value and then a minimum value, the minimum value being 70% or more of the maximum value.SELECTED DRAWING: Figure 4

Description

The present invention relates to a medical suction device.

As a medical suction device that sucks drainage (body fluid) from a living body through a tube, it is connected to a negative pressure container and a negative pressure container, and when it contracts by a squeezing operation, it is exhausted from the inside to the outside and elastically restored. It is equipped with an exhaust part that takes in air from the negative pressure container and a balloon that is arranged inside the negative pressure container, and the inside of the balloon communicates with the outside air through the pores formed in the negative pressure container. , There is a type in which the balloon expands as the negative pressure container becomes negative pressure.
As such a medical suction device, for example, there is one described in Patent Document 1.

Japanese Unexamined Patent Publication No. 2013-74914

By the way, in the drainage suction step using a medical suction device, it is desired that the drainage can be sucked with a suction pressure as uniform as possible over the entire process.

The present invention has been made in view of the above problems, and provides a medical suction device capable of sucking drainage with a more uniform suction pressure.

The present invention is a medical suction device that sucks drainage by negative pressure.
Negative pressure container and
An exhaust unit connected to the negative pressure container, which is exhausted from the inside to the outside when contracted by a squeezing operation and is taken in from the negative pressure container when elastically restored.
The balloon placed in the negative pressure container and
With
The inside of the balloon communicates with the outside air through the pores formed in the negative pressure container.
The balloon is inflated as the negative pressure container becomes negative pressure.
One contraction and elastic restoration of the exhaust part are regarded as one cycle of exhaust operation, and a plurality of cycles of exhaust operation are performed until the equilibrium point where the elastic restoration force of the exhaust part and the pressure inside the negative pressure container are balanced. Regarding the profile that plots the transition of the suction pressure of the negative pressure container for each cycle when it is broken.
The suction pressure reaches a maximum value and then reaches a minimum value.
The minimum value provides a medical suction device that is 70% or more of the maximum value.

According to the present invention, it is possible to suck the drainage liquid with a more uniform suction pressure.

It is a front view of the medical suction device which concerns on embodiment, and shows the state before exhausting from a negative pressure container. It is a front view of the medical suction device which concerns on embodiment, and shows the state which exhausted from a negative pressure container. It is a front view of the medical suction device which concerns on embodiment, and shows the state which the balloon came into contact with the inner surface of a negative pressure container in the process of performing a series of exhaust operations. It is a figure which shows the profile which plotted the transition of the suction pressure of the negative pressure container of the medical suction device which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same components are designated by the same reference numerals, and the description thereof will be omitted as appropriate.
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, arrangements, and the like of the members described below can be changed and improved without departing from the gist of the present invention, and the present invention includes equivalents thereof.

As shown in FIGS. 1 to 3, the medical suction device 100 according to the present embodiment is a medical suction device 100 that sucks drainage by negative pressure, and the negative pressure container 10 and the negative pressure container 10 It is provided with an exhaust portion 30 which is connected and exhausts from the inside to the outside when contracted by a squeezing operation and takes in from a negative pressure container 10 when elastically restored, and a balloon 20 arranged in the negative pressure container 10. ing. The inside of the balloon 20 communicates with the outside air through the pores 18a formed in the negative pressure container 10, and the balloon 20 expands as the negative pressure container 10 becomes negative pressure.
An equilibrium point (point P4 in FIG. 4; hereinafter, a point) at which the elastic restoring force of the exhaust unit 30 and the pressure inside the negative pressure container 10 are balanced, with one contraction and elastic restoration of the exhaust unit 30 as one cycle of exhaust operation. Suction is a profile (FIG. 4) that plots the transition of the suction pressure of the negative pressure container 10 for each cycle when multiple cycles of exhaust operation are performed up to the equilibrium point P4). The pressure shows a maximum value (value on the vertical axis at the point P1 in FIG. 4; hereinafter, the point P1 may be referred to as a maximum point P1) and then a minimum value (value on the vertical axis at the point P2 in FIG. 4; Hereinafter, the point P2 may be referred to as a minimum point P2), and the minimum value is 70% or more of the maximum value.

When the equilibrium point P4 is reached, after the squeezing operation on the exhaust unit 30 (as described later, the squeezing operation on the squeezing member 31), the normal restoration operation (restoration operation after the squeezing operation before reaching the equilibrium point P4). Will be delayed more than. At the equilibrium point P4, for example, the exhaust unit 30 (squeezing member 31) does not return to its natural shape even after 0.5 seconds have passed after a general medical worker performs a squeezing operation. Become.
As shown in FIGS. 4 and 1, the suction pressure of the negative pressure container 10 is represented by the pressure difference between the pressure inside the negative pressure container 10 and the atmospheric pressure. Since the inside of the negative pressure container 10 becomes a negative pressure (negative pressure) due to the exhaust operation, the suction pressure becomes a negative value. However, in the present invention, the maximum value, the minimum value, etc. in the above profile shall be considered as values when the suction pressure is expressed as an absolute value. Therefore, in the present specification, the suction pressure is hereinafter expressed as an absolute value (excluding the description in the table and the figure).
In the drainage suction process using the medical suction device 100, the suction pressure (absolute value) gradually increases from the start of suction, as opposed to the suction pressure (absolute value) gradually increasing due to the exhaust operation. It becomes smaller. At this time, the suction pressure does not always decrease in a profile that is completely opposite to the time-series when the suction pressure gradually increases due to the exhaust operation, but the suction pressure decreases in a correlated profile.

According to the present embodiment, since the minimum value is 70% or more of the maximum value, the difference between the maximum value and the minimum value is suppressed, and therefore, in the drainage suction step using the medical suction device 100, the minimum value is suppressed. It is possible to suck the drainage liquid with a more uniform suction pressure from the timing of sucking at the minimum value to the timing of sucking at the maximum value.
The minimum value is more preferably 75% or more of the maximum value, and as an example, it is about 80% of the maximum value.

Hereinafter, a more detailed description will be given.
Of FIGS. 1 to 3, FIG. 1 shows a state before exhausting from the negative pressure container 10, and FIG. 2 shows a state in which exhaust is performed from the negative pressure container 10 up to the equilibrium point P4. Further, FIG. 3 shows the moment when the balloon 20 comes into contact with the inner surface 11a of the negative pressure container 10 in the process of performing a series of exhaust operations.
In the following, the "vertical direction" refers to the vertical direction in which the medical suction device 100 is arranged in the directions shown in FIGS. 1 to 3. More specifically, the medical suction device 100 can stand on its own by being placed on a horizontal mounting surface in the postures shown in FIGS. 1 to 3.

As shown in FIGS. 1 to 3, the negative pressure container 10 includes, for example, a container body 11 and a cap 18 attached to the upper end of the container body 11.
The shape of the container body 11 is not particularly limited, but the container body 11 is formed in, for example, a rectangular parallelepiped shape. The bottom plate and the top plate of the container body 11 are arranged horizontally.
The top plate of the container body 11 is formed with a first mouth neck portion 11b and a second mouth neck portion 11c having an axial direction in the vertical direction, respectively.
The first mouth neck portion 11b is formed in a cylindrical shape and projects upward from the top plate of the container body 11. The internal space of the first mouth neck 11b communicates with the internal space of the container body 11 through an opening on the base end (lower end) side of the first mouth neck 11b. The first mouth neck 11b has a thread formed on the outer peripheral surface, and the first mouth neck 11b has a male screw shape.
The cap 18 is a screw cap. The cap 18 includes a tubular portion and a flat plate-shaped closing portion that closes one end side of the tubular portion in the axial direction. A thread is formed on the inner peripheral surface of the tubular portion to be screwed with the first mouth neck portion 11b. The cap 18 is detachably attached to the first mouth neck 11b by screwing the tubular portion into the first mouth neck 11b. As a result, the cap 18 closes the opening at the tip (upper end) of the first mouth neck 11b. Pore 18a is formed in the closed portion of the cap 18 so as to vertically penetrate the closed portion.
A holding cylinder portion 18b for holding the balloon 20 is formed in the closed portion of the cap 18. The holding tubular 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 closed portion of the cap 18. In a plan view, the pores 18a are arranged in the inner range of the holding cylinder portion 18b.
The second mouth neck portion 11c is formed in a cylindrical shape and projects upward from the top plate of the container body 11. The internal space of the second mouth neck 11c communicates with the internal space of the container body 11 through an opening on the base end (lower end) side of the second mouth neck 11c. The second mouth neck 11c is provided with a one-sided valve 32. The second oral neck 11c is closed by a one-way valve 32.

Further, the negative pressure container 10 includes, for example, a suction side tube 14 provided on the top surface of the container body 11, a connector 16 communicating with the suction side tube 14, and a clamp attached to the suction side tube 14. It includes a member 15.
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 tubular connector 16 is provided at the tip end portion (upper end portion) 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 long plate shape in one direction. The clamp member 15 is formed with a slit extending in the longitudinal direction of the clamp member 15. The suction side tube 14 is inserted through this slit, and the clamp member 15 is held by the suction side tube 14.
A part of the slit of the clamp member 15 is a wide portion formed relatively wide, and the rest of the slit is a narrow portion formed relatively narrow. The wide portion and the narrow portion are arranged continuously 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 is opened. 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 tightened by the clamp member 15 and the suction side tube 14 is tightened. The internal flow path of the container 10 is closed, the suction port 16a and the internal space of the container body 11 are mutually blocked, and the internal space of the negative pressure container 10 is closed from the outside.
Drainage after using the medical suction device 100 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 11b and the second mouth neck 11c are provided. A discharge port 12a for discharging the above is formed.
A discharge port cap 17 capable of opening and closing the discharge port 12a is attached to the discharge port 12a. Normally, the discharge port 12a is closed by the discharge port cap 17.
The container body 11 does not have to have a discharge port 12a. In this case, for example, with the cap 18 (and the balloon 20) removed from the first mouth neck 11b, the drainage may be discharged to the outside through the opening at the tip of the first mouth neck 11b.
Further, the container body 11 may be provided with a scale for confirming, for example, the amount of liquid (liquid collection amount) collected in the container body 11 by suction.

The container body 11 is made of, for example, a transparent (transparent to visible light) resin material. The transparent resin material is not particularly limited, but for example, a rigid vinyl chloride resin, a polyester resin such as polyethylene terephthalate, a styrene resin such as an acrylic nitrile-styrene copolymer resin, and a polyolefin such as polypropylene (PP) or PE. Examples thereof include based resins.

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

The shape of the balloon 20 is not particularly limited, but for example, it is formed in a tubular shape in which one end (upper end) is open and the other end is closed, and the shape before inflating (see FIG. 1) is up and down. It is long. The holding cylinder portion 18b of the cap 18 is inserted through the opening on the upper end side of the balloon 20, and the balloon 20 is airtightly attached to the holding cylinder portion 18b. The balloon 20 is held by the holding cylinder portion 18b.
The internal space of the balloon 20 communicates with the external space of the negative pressure container 10 through the pores 18a of the cap 18.
In the inflated state of the balloon 20, further expansion of the balloon 20 is regulated by the inner surface 11a of the container body 11, so that the balloon 20 inflates in a shape along the inner surface 11a of the container body 11 and the inner surface 11a of the container body 11 (See Fig. 2). More specifically, for example, at the equilibrium point P4, the balloon 20 is a portion of the container body 11 excluding the eight corners (corners), and is a portion where the first mouth neck 11b is formed and the second mouth neck 11c. Is in close contact with the portion other than the formed portion of the above, the connecting portion with the suction side tube 14, and the formed portion of the discharge port 12a.

The exhaust portion 30 includes, for example, a squeezing member 31 which is formed in a hollow shape and accepts a squeezing operation, and a one-sided valve 33 provided at a boundary between the squeezing member 31 and the external space. .. The squeezing operation is performed by the operator manually squeezing the squeezing member 31.
The squeezing member 31 has, for example, a substantially spherical shape (FIG. 1) in a natural state before the squeezing operation is performed. The squeezing member 31 is elastically deformed (contracted) by the squeezing operation, and is restored to its original shape by the elastic restoring force when the squeezing operation is released.
The pressing member 31 has, for example, a lower mouth neck 31c formed at the lower end of the pressing member 31 and an upper mouth neck 31d formed at the upper end of the pressing member 31. The lower mouth neck 31c and the upper mouth neck 31d are each formed in a cylindrical shape with the vertical direction as the axial direction.
The upper mouth neck 31d is provided with a one-sided valve 33, and the upper mouth neck 31d is closed by the one-sided valve 33. On the other hand, the valve 33 allows exhaust from the inside of the pressing member 31 to the outside (outside of the medical suction device 100), while the valve 33 allows exhaust from the outside of the pressing member 31 (outside of the medical suction device 100) to the inside of the pressing member 31. The inflow of outside air to the area is regulated.
The second mouth neck portion 11c of the container body 11 is press-fitted into the lower mouth neck portion 31c of the pressing member 31, and the pressing member 31 is airtightly attached to the container body 11. As a result, the one-sided valve 32 is arranged at the boundary between the internal space of the container body 11 and the internal space of the pressing member 31.
On the other hand, the valve 32 allows intake from the inside of the container body 11 to the inside of the pressing member 31, while restricting the backflow of gas from the inside of the pressing member 31 to the inside of the container body 11.
It is also preferable that a fastener such as a cable tie is provided around the lower mouth neck 31c.
The material of the pressing member 31 is not particularly limited, but may be, for example, natural rubber, or synthetic rubber such as isoprene rubber or silicon rubber.

The drainage liquid sucked by the medical suction device 100 is stored in the container body 11.
The body fluid introduction port on the top surface of the container body 11 (the part communicating with the suction side tube 14) and the exhaust port to the pressing member 31 of the exhaust part 30 (the base end of the second mouth neck portion 11c) are the balloon 20. It is also preferable that a groove (not shown) is formed around the body fluid introduction port and the exhaust port on the inner surface of the container main body 11 in order to prevent the container body 11 from being blocked by. It is preferable that the groove surrounds, for example, the circumference of the body fluid introduction port and the circumference of the exhaust port in a circular manner.
It is also preferable that the suction side tube 14 is arranged near the corner of the container body 11. When the balloon 20 contracts, the first gap between the balloon 20 and the inner surface of the container body 11 is near the corner of the container body 11, so that it is near the corner (for example, near the discharge port 12a). By providing the exhaust tube 14, it is possible to easily secure a space for drainage in the container body 11 from the start of the suction operation.
It is more preferable that a groove is formed around the body fluid introduction port and the exhaust port, and the suction side tube 14 is arranged near the corner of the container body 11.

In order to suck the drainage (body fluid) from the living body using the medical suction device 100, first, the suction side tube 14 is closed by the clamp member 15 and one end side is inserted into the living body (not shown). Connect the other end of the tube to the connector 16.
Next, the pressing operation on the pressing member 31 of the exhaust unit 30 is repeatedly performed, and the air inside the negative pressure container 10 is exhausted to the outside of the medical suction device 100 to make the inside of the negative pressure container 10 negative pressure. ..
When the squeezing member 31 of the exhaust unit 30 is contracted by the squeezing operation, the air in the squeezing member 31 is exhausted to the outside of the medical suction device 100 via the valve 33. When the squeezing operation is released and the squeezing member 31 is elastically restored, the air inside the container body 11 is introduced (intaken) into the squeezing member 31 via the one-side valve 32.
As the inside of the negative pressure container 10 becomes negative pressure, the balloon 20 inflates inside the container body 11 (see FIG. 2). Since the internal space of the balloon 20 communicates with the external space of the medical suction device 100 via the internal space of the holding cylinder portion 18b and the pores 18a, when the balloon 20 is inflated, the inside of the balloon 20 is formed. The outside air is introduced into. In the process of inflating the balloon 20, the balloon 20 comes into contact with the inner surface 11a of the container body 11 (see FIG. 3).
A series of exhausts are performed by repeating the squeezing operation of the squeezing member 31 and its release until the equilibrium point P4 (FIG. 4) where the elastic restoring force of the squeezing member 31 and the pressure inside the negative pressure container 10 are balanced. The operation is completed.

Here, the squeezing operation on the squeezing member 31 is performed until, for example, the opposing surfaces 31a and 31b of the squeezing member 31 come into contact with each other (the state shown by the alternate long and short dash line in FIG. 2). Further, following each pressing operation, the state of releasing the pressing operation is continued until, for example, the pressing member 31 is restored to the original substantially spherical shape (that is, the pressing member 31 is restored to the original shape). After that, the next squeezing operation will be performed). When the equilibrium point where the elastic restoring force of the squeezing member 31 and the pressure inside the negative pressure container 10 are balanced is reached, for example, the squeezing member 31 is not sufficiently restored to its original shape even after the squeezing operation is released. As shown by the solid line in FIG. 2, the state is intermediate between the state at the time of the squeezing operation (the state shown by the alternate long and short dash line) and the original spherical state.
Next, the drainage can be sucked from the living body by opening the suction side tube 14 by the clamp member 15. That is, the drainage is sucked into the container body 11 through a tube (not shown), a connector 16 and a suction side tube 14 in this order. 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 the wound of the human body.
In the process of sucking the drainage liquid, the pressure inside the negative pressure vessel 10 (the pressure inside the container body 11) gradually approaches the atmospheric pressure. That is, the suction pressure gradually weakens. In addition, the balloon 20 gradually withers in the process of sucking the drainage.
In the exhaust operation, it is not always necessary to close the suction side tube 14 with the clamp member 15. Further, the suction can be interrupted by closing the suction side tube 14 with the clamp member 15 during the suction of the drainage liquid.

Here, one cycle of exhaust operation is performed until the squeezing member 31 is contracted by one squeezing operation on the squeezing member 31 of the exhaust unit 30 and the squeezing member 31 is elastically restored once by releasing the squeezing operation. Further, the operation by the operator for performing the exhaust operation is called a pumping operation. The pressing member 31 may not be completely elastically restored in the exhaust operation when the equilibrium point P4 is reached, but the exhaust operation (and pumping operation) at that time is also regarded as one exhaust operation (and pumping operation). Count. The number of pumping operations is called the number of pumping operations. The number of pumping is synonymous with the number of cycles of exhaust operation.

Table 1 is an actually measured value showing a change in the suction pressure (unit: kPa) of the negative pressure container 10 according to an increase in the number of pumping times when the squeezing operation on the exhaust unit 30 is repeatedly performed. This measurement was performed using a commercially available pressure gauge. More specifically, the measurement was performed with the pressure gauge connected to the connector 16 via the tube. In this measurement, in each pumping operation, the squeezing member 31 was squeezed until the facing surfaces 31a and 31b of the squeezing member 31 facing each other came into contact with each other. Further, in this measurement, after performing each pumping operation, the next pumping operation was performed after waiting until the measured value of the pressure gauge became stable.
The pressing operation on the pressing member 31 is preferably performed until the internal volume of the pressing member 31 is 33% or less.
FIG. 4 shows a profile in which Table 1 is plotted. In FIG. 4, the vertical axis represents the suction pressure and the horizontal axis represents the number of pumping times.

As shown in FIG. 4, the minimum value is, for example, 11 kPa or more and 13 kPa or less. Therefore, the drainage can be sucked with sufficient strength even when sucking at a minimum value.

Here, as a matter of course, before the timing of exhibiting the maximum value, there is a timing of exhibiting the same suction pressure as the minimum value (see point P6 in FIG. 4).
Then, the number of cycles required from the maximum value to the minimum value (for example, about 2) rather than the number of cycles required from the suction pressure equal to the minimum value before the maximum value to the maximum value (for example, about 2). For example, there are many 4).
As a result, the fluctuation of the suction pressure from the maximum value to the minimum value can be moderated. Therefore, the suction from the minimum value to the maximum value is performed while suppressing the fluctuation of the suction pressure. Can be done.

As shown in FIG. 4, the suction pressure exhibits a maximum value (value on the vertical axis at the maximum point P1), then a minimum value (value on the vertical axis at the minimum point P2), and then the same suction as the maximum value. After recovering to pressure, it exceeds the maximum value and reaches the equilibrium point P4. It is point P3 in FIG. 4 that the suction pressure recovers to the same suction pressure as the maximum value after exhibiting the minimum value. Hereinafter, the point P3 may be referred to as a recovery point P3.
As a result, when the exhaust operation is performed up to the equilibrium point P4, the suction pressure does not increase monotonically, but once the maximum value and the minimum value are passed, the equilibrium point P4 is reached, so that the suction pressure is uniform. Can be transformed into.
Therefore, in the drainage suction step using the medical suction device 100, it is possible to suck the drainage with a more uniform suction pressure over the entire process.

In the case of the present embodiment, for example, the number of cycles (number of pumping times) when exhibiting a maximum value is 7 (7 times), and the number of cycles (number of pumping times) when exhibiting a minimum value is 11 (11 times). The number of cycles (number of pumping times) when the recovery point P3 is reached is 15 (15 times). Further, when the equilibrium point P4 is reached, the number of cycles (number of pumping times) is 21 (21 times).
As shown in Table 1, for example, the maximum value is 15.22 kPa, the minimum value is 12.10 kPa, and the suction pressure at the equilibrium point P4 is 25.45 kPa.
In the present invention, the maximum value is preferably 12 kPa or more and 18 kPa or less, the minimum value is preferably 9 kPa or more and 15 kPa or less, and the suction pressure at the equilibrium point P4 is preferably 20 kPa or more and 30 kPa or less.

Further, the suction pressure (maximum value) at the time of exhibiting the maximum value exceeds 50% of the suction pressure at the equilibrium point P4.
As a result, the difference between the maximum value and the suction pressure at the equilibrium point P4 is suppressed. Therefore, in the suction process of the drainage using the medical suction device 100, the suction at the start of suction (suction corresponding to the equilibrium point P4). It is possible to suck the drainage with a more uniform suction pressure from (suction by pressure) to the timing of sucking at the maximum value.

Here, as a matter of course, there is an inflection point P5 between the maximum value and the minimum value. At the inflection point P5, the slope of the profile changes from decreasing to increasing.
Looking at Table 1, among the plot points from the maximum value (7 pumping times, 15.22 kPa) to the minimum value (11 pumping times, 12.10 kPa), the suction pressure between adjacent plot points. The magnitude of the difference between them decreases as the number of pumping increases. Therefore, the number of pumping times at the inflection point P5 is considered to be between 7 and 8 times (see FIG. 4).
Then, as shown in FIG. 4, the slope of the section from the inflection point P5 to the minimum point P2 is smaller than the slope of the section from the maximum point P1 to the inflection point P5.
That is, there is an inflection point P5 between the maximum value and the minimum value, and the slope of the section from the inflection point P5 to the minimum value is smaller than the slope of the section from the maximum value to the inflection point P5.
As a result, the suction pressure in the vicinity of the minimum value becomes more uniform.

Further, the inflection point P5 is located at a position closer to the maximum value than the minimum value.
As a result, in the section between the maximum value and the minimum value, the fluctuation of the suction pressure is suppressed over a wider range in the portion close to the minimum value.

Further, the number of cycles (15) when the suction pressure is restored to the same suction pressure as the maximum value after the minimum value is twice the number of cycles (7) when the maximum value is exhibited.
As a result, in the drainage suction step using the medical suction device 100, a sufficient length of time is secured from the timing of suction at the suction pressure corresponding to the recovery point P3 to the timing of suction at the maximum value. be able to.
Here, the fact that the number of cycles when the suction pressure is restored to the same suction pressure as the maximum value after the minimum value is twice the number of cycles when the maximum value is exhibited means that the suction pressure is the same as the maximum value after the minimum value. It is assumed that the number of cycles when recovering to is twice ± 2 as the number of cycles when the maximum value is exhibited.

After recovering to the same suction pressure as the maximum value, the suction pressure monotonically increases.
Further, the balloon 20 comes into contact with the inner surface 11a of the negative pressure container 10 at the timing when the suction pressure reaches the minimum value (see FIG. 3).

Further, the number of cycles (10) required from the minimum value to the equilibrium point P4 is larger than the number of cycles (4) required from the maximum value to the minimum value.
As a result, since it takes a long time to reach the equilibrium point P4 after exhibiting the minimum value, suction from the start of suction to the minimum value can be performed for a long period of time while suppressing fluctuations in the suction pressure.

Further, the number of cycles (21) when reaching the equilibrium point P4 is approximately twice the number of cycles (11) required to reach the minimum value.
As a result, the time from the minimum value to the equilibrium point P4 becomes more certain, so that suction from the start of suction to the minimum value can be performed for a long period of time while suppressing fluctuations in suction pressure. it can.
Here, the number of cycles required to reach the equilibrium point P4 is approximately twice the number of cycles required to reach the minimum value, which means that the number of cycles required to reach the equilibrium point P4 reaches the minimum value. It shall be twice the number ± 2.

Further, the number of cycles (14) required from the maximum value to the equilibrium point P4 is larger than the number of cycles (7) required to reach the maximum value.
As a result, since it takes a long time from the maximum value to the equilibrium point P4, the suction from the start of suction to the maximum value can be performed for a long period of time while suppressing the fluctuation of the suction pressure.
More specifically, the number of cycles (14) required from the maximum value to the equilibrium point P4 is approximately twice the number of cycles (7) required to reach the maximum value.
Here, the fact that the number of cycles required from the maximum value to the equilibrium point P4 is approximately twice the number of cycles required to reach the maximum value means that the equilibrium point P4 is reached after the maximum value is exhibited. It is assumed that the number of cycles required to reach the maximum value is twice ± 2 of the number of cycles required to reach the maximum value.

Further, rather than the slope until the maximum value is exhibited (the slope of the straight line S1 shown by the alternate long and short dash line in FIG. 4), the slope from the recovery to the same suction pressure as the maximum value to the equilibrium point P4 (2 in FIG. 4). The slope of the straight line S2 indicated by the dotted chain line) is small.
As a result, suction can be performed from the start of suction until the suction pressure becomes the same as the maximum value while suppressing fluctuations in the suction pressure.

Here, in the medical suction device 100 according to the present embodiment, the dimensions and properties of each part of the medical suction device 100 are set so that the profile has the above-mentioned characteristics.
More specifically, before commercialization, the balloon 20 is subjected to a process (break-in process) as described below. In the process, for example, air is introduced into the balloon 20 and the balloon 20 is inflated once or more so that the dimension in the longitudinal direction of the balloon 20 is 2 to 3 times the normal time.
Further, the arrangement of the exhaust portion 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, the presence or absence of oil coating on the outer surface of the balloon 20, the coating amount thereof, the dimensions of the pores 18a, and the balloon. Whether or not talc is applied to the outer surface of 20 and the amount of talc applied are also appropriately set.
As an example, dimethyl silicone oil can be applied to the outer surface of the balloon 20. Further, finely pulverized fine talc (hydrous magnesium silicate, average particle size 9.0 μm) can be applied to the outer surface of the balloon 20. As an example, the finely ground fine talc has, for example, a monoclinic crystal structure and has a Mohs hardness of 1.

The present invention is not limited to the above-described embodiment, and includes various modifications, improvements, and the like as long as the object of the present invention is achieved.
For example, in the above embodiment, the negative pressure container 10 is composed of a single container, but the negative pressure container 10 is configured to include two containers, a first container and a second container. You may.
When the negative pressure container 10 includes the first container and the second container, for example, the first container is provided with the cap 18, the balloon 20, and the exhaust portion 30, and the second container has the suction side tube 14 and the connector 16. It is possible to have a configuration in which the discharge port 12a is formed as well as being provided. The medical suction device 100 in this case includes, for example, a connecting tube that allows the internal space of the first container and the internal space of the second container to communicate with each other. Then, the balloon 20 is inflated inside the first container, and the drainage is stored in, for example, the second container.
Further, the negative pressure container 10 may be configured to include three or more containers communicating with each other.

This embodiment includes the following technical ideas.
(1) A medical suction device that sucks drainage by negative pressure.
Negative pressure container and
An exhaust unit connected to the negative pressure container, which is exhausted from the inside to the outside when contracted by a squeezing operation and is taken in from the negative pressure container when elastically restored.
The balloon placed in the negative pressure container and
With
The inside of the balloon communicates with the outside air through the pores formed in the negative pressure container.
The balloon is inflated as the negative pressure container becomes negative pressure.
One contraction and elastic restoration of the exhaust part are regarded as one cycle of exhaust operation, and a plurality of cycles of exhaust operation are performed until the equilibrium point where the elastic restoration force of the exhaust part and the pressure inside the negative pressure container are balanced. Regarding the profile that plots the transition of the suction pressure of the negative pressure container for each cycle when it is broken.
The suction pressure reaches a maximum value and then reaches a minimum value.
A medical suction device whose minimum value is 70% or more of the maximum value.
(2) The medical suction device according to (1), wherein the minimum value is 11 kPa or more and 13 kPa or less.
(3) The medical suction device according to (1) or (2), wherein the balloon comes into contact with the inner surface of the negative pressure container at a timing when the suction pressure reaches the minimum value.
(4) The number of cycles required from the maximum value to the minimum value, rather than the number of cycles required from the suction pressure same as the minimum value to the maximum value before the maximum value. The medical suction device according to any one of (1) to (3).

10 Negative pressure container 11 Container body 11a Inner surface 11b 1st mouth neck 11c 2nd mouth neck 12a Discharge port 14 Suction side tube 15 Clamp member 16 Connector 16a Suction port 17 Discharge port cap 18 Cap 18a Pore 18b Holding cylinder 20 Balloon 30 Exhaust part 31 Squeezing member 31a, 31b Facing surface 31c Lower mouth neck 31d Upper mouth neck 32, 33 One valve 100 Medical suction device

Claims (4)

A medical suction device that sucks drainage by negative pressure.
Negative pressure container and
An exhaust unit connected to the negative pressure container, which is exhausted from the inside to the outside when contracted by a squeezing operation and is taken in from the negative pressure container when elastically restored.
The balloon placed in the negative pressure container and
With
The inside of the balloon communicates with the outside air through the pores formed in the negative pressure container.
The balloon is inflated as the negative pressure container becomes negative pressure.
One contraction and elastic restoration of the exhaust part are regarded as one cycle of exhaust operation, and a plurality of cycles of exhaust operation are performed until the equilibrium point where the elastic restoration force of the exhaust part and the pressure inside the negative pressure container are balanced. Regarding the profile that plots the transition of the suction pressure of the negative pressure container for each cycle when it is broken.
The suction pressure reaches a maximum value and then reaches a minimum value.
A medical suction device whose minimum value is 70% or more of the maximum value. The medical suction device according to claim 1, wherein the minimum value is 11 kPa or more and 13 kPa or less. The medical suction device according to claim 1 or 2, wherein the balloon comes into contact with the inner surface of the negative pressure container at a timing when the suction pressure reaches the minimum value. Request that the number of cycles required from the maximum value to the minimum value is larger than the number of cycles required from the suction pressure same as the minimum value to the maximum value before the maximum value. The medical suction device according to any one of items 1 to 3.

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