JP7396036B2 - medical suction device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a medical suction device.

A medical suction device that suctions waste fluid (body fluid) from a living body through a tube includes a negative pressure container, which is connected to a negative pressure container, and when it contracts due to a squeezing operation, it evacuates from the inside to the outside and restores its elasticity. It is equipped with an exhaust part that takes in air from the negative pressure container and a balloon placed inside the negative pressure container, and the inside of the balloon communicates with the outside air through pores formed in the negative pressure container. There is a type in which the balloon expands as the negative pressure in the negative pressure container becomes negative.
As such a medical suction device, there is one described in Patent Document 1, for example.

Japanese Patent Application Publication No. 2013-74914

By the way, in the process of suctioning waste liquid using a medical suction device, it is desirable to be able to suction the liquid with as uniform a suction pressure as possible throughout the entire process.

The present invention has been made in view of the above-mentioned problems, and provides a medical suction instrument capable of suctioning waste fluid with more uniform suction pressure.

The present invention is a medical suction device that suctions drainage fluid using negative pressure,
negative pressure container,
an exhaust section connected to the negative pressure container, which exhausts air from the inside to the outside when contracted by a squeezing operation, and sucks air from the negative pressure container when elastically restored;
a balloon disposed within the negative pressure container;
Equipped with
The inside of the balloon communicates with the outside air through pores formed in the negative pressure container,
The balloon expands as the negative pressure container becomes negative pressure,
One contraction and elastic restoration of the exhaust section is regarded as one cycle of exhaust operation, and a plurality of cycles of exhaust operation are performed until an equilibrium point is reached where the elastic restoring force of the exhaust section and the pressure inside the negative pressure vessel are balanced. Regarding the profile plotting the transition of the suction pressure of the negative pressure container for each cycle when
The suction pressure exhibits a maximum value, then a minimum value , and then recovers to the same suction pressure as the maximum value, and then exceeds the maximum value,
After recovering to the same suction pressure as the maximum value, the suction pressure increases monotonically,
The suction pressure when exhibiting the maximum value exceeds 50% of the suction pressure at the equilibrium point,
The profile has suction pressure as the vertical axis and the number of cycles of the exhaust operation as the horizontal axis,
A point on the profile when the suction pressure exhibits the maximum value is a maximum point,
If the point on the profile when the suction pressure exhibits the minimum value is defined as the minimum point,
There is an inflection point between the maximum point and the minimum point,
The slope of the section from the inflection point to the minimum point in the profile is smaller than the slope of the section from the maximum point to the inflection point in the profile,
In the horizontal axis direction of the profile, the position of the inflection point is closer to the maximum point than the minimum point,
The slope of the profile from the point on the profile when the number of cycles of the exhaust operation is 0 to the point on the profile when the maximum value is exhibited is greater than the slope of the profile when the suction pressure recovers to the same maximum value as the maximum value. the slope of the profile from a point on the profile to the equilibrium point is small;
Medical treatment in which the second number of cycles required from the time the exhaust operation reaches the maximum value to the equilibrium point is greater than the first number of cycles required from the time the exhaust operation reaches the maximum value, counting from 0. The present invention provides a suction device for

According to the present invention, it becomes possible to suction the drained liquid with more uniform suction pressure.

FIG. 2 is a front view of the medical suction device according to the embodiment, showing a state before the negative pressure container is evacuated. FIG. 2 is a front view of the medical suction device according to the embodiment, showing a state in which the negative pressure container is evacuated. FIG. 2 is a front view of the medical suction device according to the embodiment, showing a state in which the balloon is in contact with the inner surface of the negative pressure container during 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 based on embodiment.

Embodiments of the present invention will be described below with reference to the drawings. In addition, in all the drawings, the same reference numerals are given to the same components, and the explanation is omitted as appropriate.
The embodiments described below are merely examples for facilitating understanding of the present invention, and do not limit the present invention. That is, the shapes, dimensions, arrangement, etc. of the members described below may be changed and improved without departing from the spirit 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 suctions waste fluid using negative pressure, and includes a negative pressure container 10 and a negative pressure container 10. The balloon 20 is connected to the negative pressure container 10 and includes an exhaust section 30 that is connected to the container and exhausts air from the inside to the outside when contracted by a squeezing operation and sucks air from the negative pressure container 10 when the container is elastically restored. ing. The inside of the balloon 20 communicates with the outside air through a pore 18a formed in the negative pressure container 10, and the balloon 20 expands as the negative pressure in the negative pressure container 10 becomes negative.
One contraction and elastic restoration of the exhaust section 30 is regarded as one cycle of exhaust operation, and an equilibrium point where the elastic restoring force of the exhaust section 30 and the pressure inside the negative pressure vessel 10 are balanced (point P4 in FIG. 4; hereinafter, point Regarding the profile (Fig. 4) that plots the transition of the suction pressure of the negative pressure container 10 for each cycle when multiple cycles of evacuation operation are performed until reaching P4 (sometimes referred to as equilibrium point P4), the suction The pressure takes on a local maximum value (value on the vertical axis at point P1 in FIG. 4; hereinafter, point P1 may be referred to as local maximum point P1), and then reaches a local minimum value (value on the vertical axis at point P2 in FIG. 4; Hereinafter, point P2 may be referred to as the minimum point P2), and the number of cycles required to reach the equilibrium point P4 after the maximum value is greater than the first cycle number (for example, 7) required to reach the maximum value. The number of 2 cycles (for example, 14) is large.

When the equilibrium point P4 is reached, the normal restoring operation is performed after the squeezing operation on the exhaust part 30 (the squeezing operation on the squeezing member 31 as described later) (the restoring operation after the squeezing operation before reaching the equilibrium point P4) It will be more delayed than before. At the equilibrium point P4, for example, even after 0.5 seconds have passed after a general medical worker performs a squeezing operation, the exhaust part 30 (the squeezing member 31) is prevented from restoring to its natural shape. Become.
As shown in FIG. 4 and Table 1, the suction pressure of the negative pressure container 10 is expressed 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 negative pressure (negative pressure) due to the evacuation operation, the suction pressure becomes a negative value. However, in the present invention, the local maximum value, local minimum value, etc. in the above profile are considered to be values when the suction pressure is expressed as an absolute value. Therefore, in this specification, the suction pressure will be expressed as an absolute value (excluding descriptions in tables and figures).
In the suction process of drained liquid using the medical suction device 100, the suction pressure (absolute value) gradually increases from the start of suction, contrary to the suction pressure (absolute value) gradually increasing due to the exhaust operation. becomes smaller. At this time, the suction pressure does not necessarily decrease in a profile that is completely reversed in time series to when the suction pressure gradually increases due to the exhaust operation, but the suction pressure decreases in a correlated profile.

According to this embodiment, when the exhaust operation is performed until the equilibrium point P4 is reached, the equilibrium point P4 is reached after passing through a local maximum value and a local minimum value, so that the suction pressure can be made uniform.
Moreover, since the second number of cycles required to reach the equilibrium point P4 after exhibiting the maximum value is greater than the first number of cycles required to exhibit the maximum value, the number of cycles required from exhibiting the maximum value to the equilibrium point P4 is greater. Since the time becomes longer, suction can be performed for a long period of time from the start of suction until reaching the maximum value while suppressing fluctuations in suction pressure.
Therefore, in the step of suctioning the drained liquid using the medical suction instrument 100, it becomes possible to suck the drained liquid with a more uniform suction pressure.

This will be explained in more detail below.
Among FIGS. 1 to 3, FIG. 1 shows the state before the negative pressure container 10 is evacuated, and FIG. 2 shows the state after the negative pressure container 10 is evacuated until reaching the equilibrium point P4. Moreover, 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 addition, in the following, "vertical direction" refers to the vertical direction in a state where the medical suction instrument 100 is arranged in the orientation shown in FIGS. 1 to 3. More specifically, the medical suction device 100 can stand on its own by being placed on a horizontal placement 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.
Although the shape of the container body 11 is not particularly limited, the container body 11 is formed, for example, in the shape of a rectangular parallelepiped. The bottom plate and top plate of the container body 11 are each arranged horizontally.
The top plate of the container body 11 is formed with a first neck part 11b and a second mouth neck part 11c, each having an axial direction in the up-down direction.
The first 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 neck part 11b communicates with the internal space of the container body 11 via an opening on the proximal end (lower end) side of the first mouth and neck part 11b. The first mouth and neck part 11b has a thread formed on its outer peripheral surface, and the first mouth and neck part 11b has a male screw shape.
Cap 18 is a screw cap. The cap 18 includes a cylindrical portion and a plate-shaped closing portion that closes one end of the cylindrical portion in the axial direction. A thread is formed on the inner circumferential surface of the cylindrical portion to be screwed into the first mouth and neck portion 11b. The cap 18 is detachably attached to the first mouth and neck part 11b by screwing the cylindrical part with the first mouth and neck part 11b. As a result, the cap 18 closes the opening at the tip (upper end) of the first mouth and neck portion 11b. The closed portion of the cap 18 is formed with a pore 18a that vertically passes through 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 cylindrical portion 18b is formed to have a smaller diameter than the cylindrical portion of the cap 18, is arranged coaxially with the cylindrical portion, and hangs downward from the closed portion of the cap 18. In plan view, the pores 18a are arranged in the inner range of the holding cylinder portion 18b.
The second 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 neck part 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 part 11c. A one-way valve 32 is provided in the second mouth and neck portion 11c. The second mouth and neck portion 11c is closed by a one-way valve 32.

Furthermore, the negative pressure container 10 further 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. A member 15 is provided.
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 into a plate shape that is elongated 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 through this 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 relatively wide wide portion, and the remaining portion of the slit is a relatively narrow narrow portion. 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 part 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 part of the slit, the suction side tube 14 is tightened by the clamp member 15 and the suction side tube 14 is The internal flow path 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 closed 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 and neck part 11b, and the second mouth and neck part 11c are provided, there is a drain after the medical suction device 100 is used. A discharge port 12a is formed for discharging the water.
A discharge port cap 17 that can open and close the discharge port 12a is attached to the discharge port 12a. Normally, the outlet 12a is closed by the outlet cap 17.
Note that the container body 11 may not have the outlet 12a formed therein. In this case, for example, with the cap 18 (and balloon 20) removed from the first mouth and neck part 11b, the liquid may be discharged to the outside from the opening at the tip of the first mouth and neck part 11b.
Further, the container body 11 may be provided with a scale for checking the amount of liquid (liquid collection amount) collected in the container body 11 by suction, for example.

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

The balloon 20 is made of an elastic material that can be expanded and deflated. Materials for the balloon 20 include, for example, rubber materials such as natural rubber, isoprene rubber, and chloroprene rubber, styrene-based thermoplastic elastomers such as styrene-butadiene copolymers, styrene-isoprene copolymers, olefin-based thermoplastic elastomers, and amide-based thermoplastic elastomers. Thermoplastic elastomer materials such as elastomers and polyester elastomers are preferred.
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 this embodiment, the hardness of the material forming the balloon 20 is, for example, about 30 degrees. Here, the JIS hardness is a value measured using a durometer defined 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 this embodiment, the wall thickness of the balloon 20 is, for example, approximately 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 perpendicular 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 into a cylindrical shape with one end (upper end) open and the other end closed. It is very long. The holding cylinder part 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 part 18b. The balloon 20 is held by the holding cylinder part 18b.
The internal space of the balloon 20 communicates with the external space of the negative pressure container 10 via the pores 18a of the cap 18.
When the balloon 20 is inflated, further expansion of the balloon 20 is regulated by the inner surface 11a of the container body 11, so that the balloon 20 is inflated into a shape along the inner surface 11a of the container body 11, and (See Figure 2). More specifically, for example, at the equilibrium point P4, the balloon 20 is located at a portion of the container body 11 excluding eight corners (corners), where the first mouth and neck portion 11b is formed, and the second mouth and neck portion 11c. , the connection portion with the suction side tube 14, and the portion where the discharge port 12a is formed.

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

Note that the drain fluid sucked by the medical suction device 100 is stored in the container body 11.
The body fluid inlet on the top surface of the container body 11 (the part that communicates with the suction side tube 14) and the exhaust port to the compression member 31 of the exhaust part 30 (the base end of the second neck part 11c) are connected to the balloon 20. It is also preferable that grooves (not shown) are formed on the inner surface of the container body 11 around these body fluid inlets and exhaust ports in order to prevent them from becoming clogged. It is preferable that this groove surrounds, for example, the body fluid inlet or the exhaust port in a circumferential manner.
Further, it is also preferable that the suction side tube 14 is arranged near the corner of the container body 11. When the balloon 20 is deflated, the first place where a gap is created between the balloon 20 and the inner surface of the container body 11 is near the corner of the container body 11. By providing the exhaust tube 14, a space for the drained liquid to enter the container body 11 can be easily secured from the start of the suction operation.
In addition, it is more preferable that a groove is formed around the body fluid inlet and the exhaust port, and that the suction side tube 14 is arranged near a corner of the container body 11.

In order to aspirate waste fluid (body fluid) from a living body using the medical suction device 100, first, the suction side tube 14 is closed by the clamp member 15, and one end thereof is inserted into the living body (not shown). Connect the other end of the tube to connector 16.
Next, the compressing member 31 of the exhaust section 30 is repeatedly compressed to exhaust the air inside the negative pressure container 10 to the outside of the medical suction device 100, thereby making the inside of the negative pressure container 10 negative pressure. .
When the compression member 31 of the exhaust section 30 is contracted by the compression operation, the air within the compression 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 is elastically restored, the air inside the container body 11 is introduced (inhaled) into the squeezing member 31 via the one-way valve 32 .
As the pressure inside the negative pressure container 10 becomes negative, the balloon 20 expands inside the container body 11 (see FIG. 2). Note that the internal space of the balloon 20 communicates with the external space of the medical suction instrument 100 via the internal space of the holding cylinder portion 18b and the pores 18a, so when the balloon 20 is inflated, the internal space of the balloon 20 is outside air is introduced. In addition, during 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).
By repeating the squeezing operation and release of the squeezing member 31 until reaching the equilibrium point P4 (FIG. 4) where the elastic restoring force of the squeezing member 31 and the internal pressure of the negative pressure container 10 are balanced, a series of exhaust gases are generated. The operation is complete.

Here, the squeezing operation on the squeezing member 31 is performed until, for example, the mutually opposing opposing surfaces 31a and 31b of the squeezing member 31 come into contact (the state shown by the two-dot chain line in FIG. 2). Further, following each squeezing operation, the state of canceling the squeezing operation is continued until, for example, the squeezing member 31 is restored to its original approximately spherical shape (that is, the squeezing member 31 is restored to its original shape). (After that, perform the next squeezing operation). When the elastic restoring force of the compressing member 31 and the internal pressure of the negative pressure container 10 reach an equilibrium point, for example, the compressing member 31 does not fully return to its original shape even after the squeezing operation is canceled, and, for example, As shown by the solid line in FIG. 2, the state is intermediate between the state during the squeezing operation (the state shown by the two-dot chain line) and the original spherical state.
Next, by opening the suction side tube 14 with the clamp member 15, drainage fluid can be suctioned from the living body. That is, the drained 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, etc. can be drained from a wound in the human body.
In the process of sucking the drained 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, the balloon 20 gradually deflates during the process of sucking the drained liquid.
Note that during the exhaust operation, it is not necessarily necessary to close the suction side tube 14 with the clamp member 15. In addition, the suction can be interrupted by closing the suction side tube 14 with the clamp member 15 during suction of the drained liquid.

Here, one cycle of exhaust operation is from the time when the compressing member 31 of the exhaust section 30 is compressed by one compressing operation to the compressing member 31 being elastically restored once by releasing the compressing operation. Further, the operation performed by the operator to perform the exhaust operation is referred to as a pumping operation. In the exhaust operation that reached the equilibrium point P4, the squeezing member 31 may not fully recover its elasticity, but the exhaust operation (and pumping operation) at that time may be treated as one exhaust operation (and pumping operation). Count. The number of pumping operations is called the number of pumping operations. The number of pumping times is synonymous with the number of cycles of pumping operation.

Table 1 shows actual measured values showing changes in the suction pressure (unit: kPa) of the negative pressure container 10 in response to an increase in the number of pumping operations when the exhaust section 30 is repeatedly compressed. This measurement was performed using a commercially available pressure gauge. More specifically, the measurement was performed with a pressure gauge connected to the connector 16 via a tube. During this measurement, in each pumping operation, the pressing member 31 was compressed until the mutually opposing surfaces 31a and 31b of the pressing member 31 came into contact with each other. In addition, during this measurement, after performing each pumping operation, the next pumping operation was performed after waiting until the measured value of the pressure gauge stabilized.
In addition, it is preferable to perform the squeezing operation on the squeezing member 31 until the internal volume of the squeezing member 31 becomes 33% or less.
FIG. 4 shows a profile plotted from Table 1. In FIG. 4, the vertical axis is the suction pressure, and the horizontal axis is the number of pumping times.

As shown in FIG. 4, the suction pressure exhibits a local maximum value (the value on the vertical axis at the local maximum point P1), then a local minimum value (the value on the vertical axis at the local minimum point P2), and then reaches a local maximum at the recovery point P3. After the suction pressure recovers to the same value, it exceeds the maximum value and reaches the equilibrium point P4.

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

As described above, in the case of the present embodiment, the number of cycles (14) required to reach the equilibrium point P4 after exhibiting the maximum value is approximately twice the number of cycles (7) required to reach the maximum value.
Here, the number of cycles required to reach the equilibrium point P4 after the maximum value is approximately twice the number of cycles required to reach the maximum value means 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 equilibrium point P4 after the maximum value is reached. It is assumed that the number of cycles required to reach the maximum value is twice the number of cycles required to reach the maximum value.

In addition, the suction pressure (maximum value) when exhibiting a local maximum value exceeds 50% of the suction pressure at the equilibrium point P4.
As a result, the disparity between the local maximum value and the suction pressure at the equilibrium point P4 is suppressed, so in the drainage suction process using the medical suction device 100, at the start of suction (the suction pressure corresponding to the equilibrium point P4) It becomes possible to aspirate waste liquid with a more uniform suction pressure over the timing from when the suction is performed at a maximum pressure to when the suction is performed at a maximum value.

As shown in FIG. 4, the suction pressure exhibits a local maximum value, then a local minimum value, then recovers to the same suction pressure as the local maximum value, and then exceeds the local maximum value. Note that the suction pressure recovers to the same value as the maximum value after reaching the minimum value at point P3 in FIG. Hereinafter, point P3 may be referred to as recovery point P3.
Then, the slope from the time the suction pressure recovers to the same maximum value to the equilibrium point P4 (the slope of the straight line S1 shown in FIG. 4 as a two-dot chain line in FIG. The slope of the straight line S2 indicated by the dashed dotted line) is small.
Thereby, suction can be performed from the start of suction until the suction pressure reaches the same maximum value while suppressing fluctuations in the suction pressure.

Further, the minimum value is 70% or more of the maximum value.
As a result, the disparity between the maximum value and the minimum value is suppressed, so in the process of suctioning waste fluid using the medical suction device 100, from the timing of suctioning at the minimum value to the timing of suctioning at the maximum value, the difference between the maximum value and the minimum value is suppressed. It becomes possible to aspirate waste liquid with uniform suction pressure.
More specifically, for example, the minimum value is 75% or more of the maximum value, and is about 80%.

Note that the minimum value is 11 kPa or more and 13 kPa or less. Therefore, even when suctioning at a minimum value, the drained liquid can be suctioned with sufficient strength.

Here, naturally, an inflection point P5 exists between the local maximum value and the local minimum value. At the inflection point P5, the slope of the profile changes from decreasing to increasing.
Looking at Table 1, the suction pressure between adjacent plot points from the maximum value (15.22 kPa at 7 pumping times) to the minimum value (12.10 kPa at 11 pumping times) is shown in Table 1. The magnitude of the difference in both decreases as the number of pumping increases. Therefore, the number of times of pumping that reaches the inflection point P5 is considered to be between 7 and 8 times (see FIG. 4).
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.
This makes the suction pressure near the minimum value more uniform.

Further, the inflection point P5 is located closer to the local maximum value than the local minimum value.
Thereby, in the section between the local maximum value and the local minimum value, fluctuations in the suction pressure are suppressed over a wider range in a portion close to the local minimum value.

Further, the number of cycles (15) when the suction pressure recovers to the same suction pressure as the maximum value after the minimum value is twice the number of cycles (7) when the suction pressure reaches the maximum value.
As a result, in the drain fluid suction step using the medical suction device 100, a sufficient length of time is ensured from the timing of suctioning at the suction pressure corresponding to the recovery point P3 to the timing of suctioning at the maximum value. be able to.
Here, the number of cycles when the suction pressure recovers to the same maximum value after the minimum value is twice the number of cycles when the maximum value is reached means that the suction pressure is the same as the maximum value after the minimum value. It is assumed that the number of cycles required to recover to the maximum value is ±2 times the number of cycles required to reach the maximum value.

Note that after the suction pressure recovers to the same value as the maximum value, the suction pressure increases monotonically.
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 exhibits a minimum value (see FIG. 3).

Further, the number of cycles (10) required from exhibiting a local minimum value to reaching the equilibrium point P4 is greater than the number of cycles (4) required from exhibiting a local maximum value to exhibiting a local minimum value.
As a result, the time from when the minimum value is reached to when the equilibrium point P4 is reached becomes longer, so that suction can be performed for a long period of time from the start of suction until the minimum value is reached, while suppressing fluctuations in the suction pressure.

Further, the number of cycles (21) required to reach the equilibrium point P4 is approximately twice the number of cycles (11) required to reach the minimum value.
As a result, the period from when the minimum value is reached to the equilibrium point P4 is more reliably extended, so that suction can be performed for a long period of time from the start of suction until the minimum value is reached while suppressing fluctuations in the suction pressure. 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 means that the number of cycles required to reach the equilibrium point P4 is the number of cycles required to reach the minimum value. It is assumed to be twice the number ±2.

Here, naturally, before the timing when the maximum value is exhibited, there is a timing when the suction pressure is the same as the minimum value (see point P6 in FIG. 3).
The number of cycles required from the maximum value to the minimum value (approximately 2) is greater than the number of cycles required from the same suction pressure as the minimum value before the maximum value (approximately 2) to the minimum value. ) are common.
As a result, fluctuations in the suction pressure from the maximum value to the minimum value can be moderated, so suction can be performed from the minimum value to the maximum value while suppressing fluctuations in the suction pressure. I can do it.

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 characteristics described above.
More specifically, before commercialization, the balloon 20 is subjected to a process (conditioning process) as described below. In this process, for example, air is introduced into the balloon 20 and the balloon 20 is inflated one or more times so that the longitudinal dimension of the balloon 20 becomes 2 to 3 times the normal size.
Further, the arrangement of the exhaust part 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 of the balloon 20, the amount of oil applied, the dimensions of the pores 18a, and the size of the pores 18a. The presence or absence of talc coating on the outer surface of 20 and the amount of talc applied are also appropriately set.
As an example, the outer surface of balloon 20 can be coated with dimethyl silicone oil. Further, the outer surface of the balloon 20 can be coated with finely pulverized talc (hydrated magnesium silicate, average particle size 9.0 μm). As an example, finely ground fine talc has, for example, a monoclinic crystal structure and a Mohs hardness of 1.

The present invention is not limited to the above-described embodiments, but also includes various modifications and improvements as long as the object of the present invention is achieved.
For example, in the embodiment described above, the negative pressure container 10 is configured as a single container, but the negative pressure container 10 is configured as having two containers, a first container and a second container. It's okay.
When the negative pressure container 10 includes a first container and a second container, for example, the first container is provided with the cap 18, the balloon 20, and the exhaust part 30, and the second container is provided with the suction side tube 14 and the connector 16. It is possible to adopt a configuration in which a discharge port 12a is formed. The medical suction instrument 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 drained liquid is stored in, for example, the second container.
Further, the negative pressure container 10 may be configured to include three or more containers that communicate with each other.

This embodiment includes the following technical ideas.
(1) A medical suction device that suctions drainage fluid using negative pressure,
negative pressure container,
an exhaust section connected to the negative pressure container, which exhausts air from the inside to the outside when contracted by a squeezing operation, and sucks air from the negative pressure container when elastically restored;
a balloon disposed within the negative pressure container;
Equipped with
The inside of the balloon communicates with the outside air through pores formed in the negative pressure container,
The balloon expands as the negative pressure container becomes negative pressure,
One contraction and elastic restoration of the exhaust section is regarded as one cycle of exhaust operation, and a plurality of cycles of exhaust operation are performed until an equilibrium point is reached where the elastic restoring force of the exhaust section and the pressure inside the negative pressure vessel are balanced. Regarding the profile plotting the transition of the suction pressure of the negative pressure container for each cycle when
The suction pressure exhibits a local maximum value and then a local minimum value,
A medical suction device in which a second number of cycles required to reach the equilibrium point after exhibiting the maximum value is greater than a first number of cycles required to reach the maximum value.
(2) The medical suction device according to (1), wherein the second number of cycles is approximately twice the first number of cycles.
(3) The medical suction device according to (1) or (2), wherein the suction pressure when exhibiting the maximum value exceeds 50% of the suction pressure at the equilibrium point.
(4) The suction pressure exhibits a maximum value, then a minimum value, and then recovers to the same suction pressure as the maximum value, and then exceeds the maximum value,
The medical device according to any one of (1) to (3), wherein the slope from when the suction pressure recovers to the same maximum value as the maximum value to the equilibrium point is smaller than the slope from when the suction pressure reaches the maximum value. Suction device.

10 Negative pressure container 11 Container main body 11a Inner surface 11b First neck part 11c Second mouth neck part 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 part 20 Balloon 30 Exhaust part 31 Squeezing members 31a, 31b Opposing surface 31c Lower mouth and neck 31d Upper mouth and neck 32, 33 One-way valve 100 Medical suction instrument

Claims (2)

A medical suction device that suctions drainage fluid using negative pressure,
negative pressure container,
an exhaust section connected to the negative pressure container, which exhausts air from the inside to the outside when contracted by a squeezing operation, and sucks air from the negative pressure container when elastically restored;
a balloon disposed within the negative pressure container;
Equipped with
The inside of the balloon communicates with the outside air through pores formed in the negative pressure container,
The balloon expands as the negative pressure container becomes negative pressure,
One contraction and elastic restoration of the exhaust section is regarded as one cycle of exhaust operation, and a plurality of cycles of exhaust operation are performed until an equilibrium point is reached where the elastic restoring force of the exhaust section and the pressure inside the negative pressure vessel are balanced. Regarding the profile plotting the transition of the suction pressure of the negative pressure container for each cycle when
The suction pressure exhibits a maximum value, then a minimum value , and then recovers to the same suction pressure as the maximum value, and then exceeds the maximum value,
After recovering to the same suction pressure as the maximum value, the suction pressure increases monotonically,
The suction pressure when exhibiting the maximum value exceeds 50% of the suction pressure at the equilibrium point,
The profile has suction pressure as the vertical axis and the number of cycles of the exhaust operation as the horizontal axis,
A point on the profile when the suction pressure exhibits the maximum value is a maximum point,
If the point on the profile when the suction pressure exhibits the minimum value is defined as the minimum point,
There is an inflection point between the maximum point and the minimum point,
The slope of the section from the inflection point to the minimum point in the profile is smaller than the slope of the section from the maximum point to the inflection point in the profile,
In the horizontal axis direction of the profile, the position of the inflection point is closer to the maximum point than the minimum point,
The slope of the profile from the point on the profile when the number of cycles of the exhaust operation is 0 to the point on the profile when the maximum value is exhibited is greater than the slope of the profile when the suction pressure recovers to the same maximum value as the maximum value. the slope of the profile from a point on the profile to the equilibrium point is small;
Medical treatment in which the second number of cycles required from the time the exhaust operation reaches the maximum value to the equilibrium point is greater than the first number of cycles required from the time the exhaust operation reaches the maximum value, counting from 0. suction equipment. The medical suction device according to claim 1, wherein the second number of cycles is approximately twice the first number of cycles.

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