WO2020043817A1

WO2020043817A1 - Drainage device and drainage set

Info

Publication number: WO2020043817A1
Application number: PCT/EP2019/073074
Authority: WO
Inventors: Egon Wiest
Original assignee: Egon Wiest
Priority date: 2018-08-30
Filing date: 2019-08-29
Publication date: 2020-03-05

Abstract

The present invention relates to a drainage device for active drainage, comprising: - a reservoir (10) having a top (101), a bottom (102), a surrounding wall (105) which extends between the top (101) and the bottom (102) and is elastically deformable, and a valve (103) on the top (101); - at least one pivot joint (12) which connects the top (101) and the bottom (102) of the reservoir (10) together on one side of the surrounding wall (105); and - at least one clamping device (100) which is arranged between the top (101) and the bottom (102) of the reservoir (10) at least on a side of the surrounding wall (105) opposite the side on which the pivot joint (12) is arranged, wherein, when the drainage device (1) is in a starting position, the surrounding wall (105) is compressed between the top (101) and the bottom (102), and the clamping device (100), when the drainage device (1) is in a starting position, is pretensioned toward the top (101) and the bottom (102). The invention further relates to a drainage set (5) having a drainage device (1) of this kind.

Description

description

Drainage device and drainage set

The present invention relates to a drainage device and a

Drainage set.

When treating diseases such as ascites or pleural effusions, it is necessary to remove the accumulated liquids from the patient's body. As a rule, the fluid is removed in an outpatient procedure. It is also necessary for the doctor to puncture the effusion. In order to be able to avoid this outpatient procedure, devices are known in which the patient can remove the liquid from the effusion himself or by the support of relatives or nursing services in his home environment. For this purpose, a permanent catheter is implanted, one end of which lies in the area of the effusion, for example in the chest area, in particular the pleural space, or in the abdominal area. The other end of the catheter can be connected to a collection vessel by the patient if necessary or at regular intervals.

In order to initiate the effusion drainage, suction is often required in order to conduct liquid into a suitable collecting vessel via the implanted catheter, which can also be referred to as a permanent catheter.

Two basic principles have been established for this.

On the one hand, effusion can be drained into a so-called vacuum bottle. In this variant, a container with reduced internal pressure is connected to the catheter. The effusion, that is to say the liquid, is passed through the catheter into the container through the suppression. In this application there is a derivative of liquids, in particular effusion drainage, which is supported by suction, referred to as active drainage.

On the other hand, effusion is drained into gravity bags. Bag systems are connected to the catheter. The liquid is drained off by a gravity gradient that builds up as soon as the bag system is below the catheter. This type of effusion drainage, which uses only a gravity gradient as the driving force, is referred to below as passive drainage.

While the two known systems for draining effusions are generally suitable and also used, they have inherent problems. The vacuum bottles must be made of a rigid material in order to be able to withstand the initial suppression that prevails in the bottle. However, this rigid shell ensures that the pressure inside the bottle increases continuously when pouring effusion. In this way, positive internal pressures are reached at the end of a drainage. In order to achieve the desired filling volumes, volume-dependent high negative pressures must be built up in the bottle, which e.g. for variants with a capacity of 1000 ml can be up to -800 mbar. If the bottle is connected to the catheter, a high initial suction is created immediately after the connection has been established, which can be uncomfortable or even painful for the patient and / or can suck in adjacent tissue on the catheter. This effect can be countered by reservoirs with a smaller filling volume, such as are often used in pleural effusions, by using a lower suppressor. However, the initial suction cannot be reduced for the derivation of ascites, in which large volumes of typically up to 1-2 liters are drained per drainage process, since otherwise the required amount could not be derived, so that the patient basically takes the risk, for example of tissue suction.

The temporal development of the pressure conditions within the vacuum bottle can be described in a first approximation using the ideal gas law according to V ^v = ^ώMΊ with p = Pressure, V = volume, n = number of moles of gas, R = ideal gas constant and T = room temperature. Become n and T during a drainage process

Approximately assumed to be constant, there is a non-linear relationship in the pV diagram. As a result, the suction acting on the patient is not constant during the drainage process, but decreases hyperbolically and a high initial suction must be applied in order to be able to generate sufficient suction at the end of the drainage process, which corresponds to the increasing internal pressure

counteracts.

Gravity bags are not affected by this limitation. Since they can be made from stretchable material, they build during the

Drainage process does not create excess pressure in the container, so that even larger ones

Volumes can be drained by gravity at a substantially constant flow rate. However, as the driving force behind this type of drainage

is formed solely by gravity, the possible suction is determined by the height difference between the effusion and the bag reservoir. If one assumes a catheter position of 70 cm for ascites and a sedentary posture, there is a maximum pressure difference of -0.7m H20 = ~ -68.5 mbar compared to -800 mbar for vacuum bottles when the gravity reservoir is positioned on the floor. This lower pressure difference enables a very smooth and even drainage, but the flow rates are limited, which significantly increases drainage times. For some patients, these times are clearly too long because they cannot endure sitting still mentally or physically.

In addition, vacuum bottles are disadvantageous in terms of disposal, since they take up a lot of space due to the rigid material from which they must be made. This is a great disadvantage for the patient, in particular for home use. The present invention is therefore based on the object

To create a drainage device and a drainage set, by means of which an essentially constant and volume-independent suppression can be generated on the one hand and which are easy to handle on the other hand.

The invention is based on the knowledge that this object can be achieved by using a mechanical structure for generating the suction, which can be controlled by means of mechanical devices.

According to a first aspect, the task is therefore solved by a

Active drainage device comprising:

a reservoir with a cover, a base, an surrounding wall, which extends between the cover and the base and is elastically deformable, and a valve on the cover,

at least one swivel joint that connects the lid and the bottom of the reservoir on one side of the surrounding wall,

- At least one jig, which is at least on one side of the

Surrounding wall, which is located opposite the side on which the swivel joint is located, between the lid and the bottom of the reservoir, the surrounding wall between the lid and the bottom being compressed in an initial position of the drainage device and the clamping device in the initial position of the Drainage device is biased towards the lid and the bottom.

A drainage device is a device that is suitable for the active drainage of liquids. The drainage device is preferably a device for home use. The is particularly preferred

Drainage device a device that is suitable for the active drainage of liquids from the abdominal or pleural space. The

Drainage device can therefore be used to treat, for example, ascites or pleural effusion. In addition to these preferred applications, the Drainage device can also be used to drain other body fluids such as urine, blood or blood serum. The ones described below

Applications for pleural effusions and ascites are mentioned on the others

Areas of application can be obtained accordingly. As an active drainage

according to the invention, in particular a discharge of liquids, in particular effusions, referred to, which is supported by suction, with no other than the suppression which is generated by the drainage device itself

Influencing of the flow, for example by means of pumps, takes place.

According to the invention, the drainage device comprises a reservoir, at least one swivel joint and at least one clamping device.

The reservoir is the reservoir into which the liquid drained from the body during drainage is collected. The reservoir has a lid, a bottom, one extending between the lid and the top

Surrounding wall and at least one valve on the lid. The valve is preferably permanently attached to the cover. Liquid can enter the reservoir through the valve. The valve can be, for example, a valve which prevents liquids and air from escaping from the reservoir up to a predetermined internal pressure of the reservoir. However, the valve is preferably a non-return valve which completely prevents the escape of liquids and air from the reservoir. The valve can be a lip valve, for example. This prevents liquids and air from flowing back into the catheter. If the reservoir is separated from the catheter, the reservoir can be emptied either by generating a higher internal pressure or, in the case of a check valve, by separating the valve from the reservoir.

The lid of the reservoir can also be referred to as the top of the reservoir and can represent, for example, a flat surface. The bottom of the Reservoirs can also be referred to as the underside of the reservoir and can also represent, for example, a flat surface. The surrounding wall of the reservoir connects the lid and the bottom and thus closes off the inside of the reservoir from the sides. The surrounding wall is preferably designed in one piece with the lid and the bottom. The reservoir forms an airtight one

closed space, which is connected to the environment only by the valve.

The surrounding wall preferably represents a tubular shape. The cross section of the tubular shape can be circular, oval or angular, for example.

The cross section of the tube shape is preferably oval and the surrounding wall thus forms an oval cylinder.

The surrounding wall and preferably the entire reservoir consist of an elastically deformable material. The reservoir preferably has a rigidity which prevents the surrounding wall from deforming outwards or inwards. The rigidity can be created by the material of the reservoir and / or by the geometry of the reservoir. The reservoir can for example consist of a

Be made of plastic. The wall thickness of the lid, the bottom and the surrounding wall can be, for example, in the range from 0.5 mm to 1.5 mm, for example 0.8 mm.

According to the invention, the drainage device has at least one swivel joint which connects the lid and the bottom of the reservoir to one another on one side of the surrounding wall. A swivel joint is a connecting device by means of which the cover and the base can pivot towards and away from one another. The swivel joint can guide the lid and base during the swivel movement and, if necessary, support the swivel movement. For this purpose, the swivel joint is connected on the one hand to the floor and on the other hand to the cover. The connection of the

Swivel with the lid and the bottom can be indirect or direct respectively. In particular, the swivel joint can be attached directly to the cover on the one hand and to the floor on the other hand. However, it is also within the scope of the invention that the swivel joint is connected to the cover and base indirectly, for example by a cover plate attached to the cover and by a base plate attached to the base. A single swivel joint can be provided. However, it is also within the scope of the invention that several, for example two, rotary joints are provided. In the following, reference is essentially made to embodiments with a swivel joint for easier understanding. Furthermore, the drainage device has at least one clamping device, which on at least one side of the surrounding wall, the side on which the

Swivel joint is arranged, is located between the lid and the bottom of the reservoir. A clamping device is a component or part of a component that is arranged between the cover and the bottom of the reservoir and that can exert a force on the cover and the base, by means of which the cover and the base are pressed apart at least in regions. The force applied by the jig is therefore a compressive force. The side of the surrounding wall on which the jig is provided is opposite to the side of the surrounding wall on which the swivel joint is arranged. A region of the outer surface of the reservoir, which is formed by the surrounding wall, is therefore referred to as the side of the surrounding wall. In the case of a tubular shape of the surrounding wall with an oval

Cross section can therefore, for example, the swivel joint in the area of a first intersection of a secant along the largest diameter with the

Surrounding wall and the jig in the area of the second

Intersection of the secant along the largest diameter with the

Surrounding wall may be arranged. The swivel joint and the clamping device are thus on opposite sides of the reservoir. According to one embodiment, the cross section of the reservoir is an oval or a rectangle with a length greater than its width. This allows the distance between the jig and the swivel to be maximized.

According to the invention, the surrounding wall between the cover and the base is compressed and the clamping device is in the initial position

Drainage device biased towards the lid and the bottom. The starting position here is the position of the drainage device in which no suppression has yet been generated, that is to say in which the clamping device is in the tensioned state. In the starting position, the lid and the base are preferably close to one another. With a flat lid and bottom, these are preferably parallel to one another. The drainage device can be brought into this starting position and held manually. Preferably, however, a securing element is detachably connected to the drainage device, which the

Drainage device holds in the starting position. In the starting position, the surrounding wall between the lid and the bottom is compressed. As

compressed means a state of the surrounding wall in which it is compressed or folded. In the initial position of the drainage device, the clamping device is biased towards the lid and the bottom. This means that the clamping device in the

Starting position applies a compressive force to the floor and the lid.

By providing at least one swivel joint and at least one clamping device on opposite sides of the reservoir on a reservoir and exerting a pressure force on the lid and the base in an initial position, a number of advantages can be achieved. In particular, the distance between the lid and the bottom of the reservoir can be increased by a movement from the initial position by the clamping device, as a result of which the volume inside the reservoir in which liquid can be taken up increases. The distance between the lid and the bottom in the area of the Joint still kept low. The relative movement between the base and cover, which is generated in particular by the clamping device, is thus limited by the rotary joint. The bottom and lid can only be pivoted against each other. Since the surrounding wall in the

Starting position is compressed, the increase in the distance between the lid and bottom in the area of the jig by unfolding or

Deduction of the surrounding wall can be compensated and the surrounding wall therefore remains connected to the bottom and the lid.

By a pivoting movement of the bottom and the lid away from each other, which is generated mechanically, and the associated increase in volume of the

Interior, a negative pressure is generated in the reservoir. Due to this suppression, liquid can enter the inside of the reservoir via the valve on the cover of the reservoir

Reservoirs are sucked. By independently relaxing the

The clamping device results in a constant volume increase, so that a volume-independent, constant suction is built up and maintained accordingly.

With the present invention, therefore, a high initial negative pressure required in the prior art is not necessary. There is thus no risk of tissue retraction in the invention and the duration of the treatment is also

significantly reduced compared to a gravity bag. Furthermore, the

Drainage device easy to handle. Due to the swivel joint on the side of the reservoir on which the swivel joint is arranged, even when the clamping device is in a relaxed state, that is to say when the cover and base are pressed apart, the distance between cover and base is still small. after the

After the drainage device has been removed from the catheter, the patient can empty it by exerting a compressive force on the clamping device against the direction of the clamping force of the clamping device. As a result, the cover and the base are moved towards one another counter to the compressive force of the clamping device. The volume decreases and the liquid collected can over exit the valve or a check valve after removing the valve. Since the movement of the lid and base is a swiveling movement, the patient only has to exert less force. This simplifies the emptying of the reservoir and thus its handling. Furthermore, due to the pivoting movement, the relative change in distance is that of the swivel joint

opposite side enlarged for a given volume. If, in a preferred embodiment, a reading scale is attached to this position for reading the filling volume via the change in distance, this reading can be carried out with greater accuracy than is possible, for example, when the clamping device is unfolded in parallel without a swivel joint.

According to one embodiment, the swivel joint limits the pivoting movement of the cover and the bottom of the reservoir to one another to a maximum angle, preferably less than 90 °, for example 80 ° or 60 °. This limitation can be done by a stop on or in the swivel joint or by the structure of the swivel joint itself. By limiting the pivoting movement, it can be ensured that the reservoir can continue to be easily compressed by the patient in an end position. Furthermore, the maximum filling volume is limited. This is an advantage, since draining a quantity of liquid of more than 2000 ml, for example, can lead to hypotension.

According to a preferred embodiment, the swivel joint is a spring, in particular a leg spring. In this embodiment, the

Limitation of the maximum angle can be created by the shape of the leg spring. An advantage of the embodiment in which the swivel joint is a spring is that this reduces the force that has to be applied by the clamping device to move the cover and / or base from the starting position into the end position, since the Spring stretching the

Jig supports. Is the spring a leg spring and such

introduced that this is biased in the starting position, the leg spring supports the pivoting movement of the bottom and / or lid and guides the function of a swivel. By using the power of

Clamping device is less, the drainage device is even easier to handle. Applying the force to compress the reservoir is easier with a leg spring that counteracts this, since the patient who compresses the reservoir in the area of the clamping device can use the lever arm created by the cover and / or base .

According to a preferred embodiment, the swivel joint is arranged outside the reservoir. With this arrangement, on the one hand, the structure of the drainage device can be simplified. Furthermore, the fulcrum of the

In this embodiment, the swivel joint is enlarged even further from the point of application at which the patient has to compress the clamping device, and the force to be applied is thus further reduced.

According to a preferred embodiment, the clamping device is formed by the material of the reservoir. In particular, the clamping device is formed by a part of the reservoir and more preferably by the surrounding wall or a part of the surrounding wall. In this embodiment, the material of the reservoir, in particular the part by which the clamping device is formed, consists of resilient material or has a geometry by means of which resilient properties are imparted.

The construction of the drainage device is further simplified by the fact that the clamping device is formed by the material of the reservoir. In particular, no other components on the reservoir are necessary apart from the swivel joint. This also simplifies the handling of the drainage device.

The clamping device preferably represents a bellows which forms at least part of the surrounding wall of the reservoir. The bellows is preferably made of a rigid material. This allows the bellows to be deformed in accordance with the molded folds Bulging the reservoir is prevented or at least made difficult. In addition, the bellows is compressed in the initial position of the clamping device and is thus biased towards the bottom and the lid. Since the material of the bellows is rigid, the compressive force becomes

Clamping the clamping direction generated by the bellows.

According to one embodiment, the clamping device extends over the entire surrounding wall. In particular, the bellows can extend over the entire circumference of the surrounding wall. In addition, the bellows can preferably extend over the entire fleas of the reservoir. The fleas of the reservoir are the distance between the lid and the bottom. The construction of the drainage device is further simplified by the fact that the clamping device extends over the entire surrounding wall. On the other hand, the pressure force caused by the clamping device and in particular by the

Bellows generated will be maximized. Because by the pressure force

Volume increase is defined in the reservoir, the can also

Suppression in the reservoir can be increased. The suppression remains constant due to the combination of the clamping device and the swivel joint.

As an alternative or in addition to the surrounding wall which at least partially forms the clamping device, the clamping device can comprise a spring element in the form of a compression spring. The spring element can be arranged inside or outside the reservoir. The spring element is preferably a helical spring. The clamping device can also have several

Include spring elements in the form of compression springs. By that or that

Spring elements can compress the force through which the lid and bottom

pressed apart and thus pivoted against each other, enlarged and set specifically.

According to one embodiment, the drainage device has fastening elements for fastening a in the area of the clamping device Securing element on the drainage device. Preferably, two fastening elements are provided, one fastening element in the area of the lid and the other fastening element in the area of the bottom of the

Reservoirs is arranged. The fastening elements can each be provided on a cover plate, which is connected to the cover, and on a base plate, which is connected to the bottom of the reservoir. The fastening element can be a projection or a recess. A device is referred to as a securing element by which the reservoir can be held in the starting position. The securing element can represent a material strip, hook or the like.

As a result, the reservoir can be held in the starting position. In this position, the drainage device can be transported, stored and disposed of. Since the surrounding wall is compressed in the starting position, the space required for storage and disposal is minimized.

According to one embodiment, the drainage device has a cover plate on the cover of the reservoir and a base plate on the bottom. The

The cover plate and the base plate are made of rigid material. The

The cover plate can be made in one piece with the cover and the base plate can be made in one piece with the bottom. Alternatively, the top plate can be attached to the lid and the bottom plate can be attached to the bottom. Through the cover plate and the base plate, which are formed in particular from rigid material, the force that is applied to the cover and the base can

or is applied by the swivel, are reliably transmitted.

According to a further aspect, the invention relates to a drainage set, the drainage set comprising at least one drainage device according to the invention. Advantages and features that have been and will be described with regard to the drainage device apply - if applicable - accordingly to the drainage set and vice versa.

According to one embodiment, the drainage set comprises a reading scale which is arranged or can be arranged on the reservoir and which allows the

Read liquid level independently of the liquid level. In this embodiment, another advantage of the present invention can be used. In that the reservoir has a wedge shape in the end position, the liquid level is on the side of the reservoir that is the swivel joint

opposite, even at a lower liquid level, and is therefore easier to read. The reading scale can be designed in the form of a plate on which the scale is applied.

According to a further embodiment, the drainage set includes a

Securing element that can be connected to the fastening devices on the lid and base. The securing element can be a strip of material in which openings are made, into which the fastening elements can be introduced in the form of projections of the cover and base. The distance between the openings thus defines the fleas that the drainage device in the

Starting position. Alternatively, the securing element can also be a material strip with projections, which can be introduced into fastening elements in the form of cutouts on the lid and bottom of the reservoir.

According to a further embodiment, the drainage set includes a

Hose element. The hose element can be connected to the valve on the cover of the drainage device. The other end of the tube element is connected to the catheter, which is preferably an implanted catheter. A check valve is preferably provided in the hose element, which prevents liquids and air from coming back into the reservoir flow into the catheter and thus into the patient's body. This check valve is preferably designed in such a way that it prevents a flow of liquid in the direction of the catheter even at high pressures from the direction of the reservoir.

The invention is explained again below with reference to the accompanying figures. Here show:

Figure 1 is a schematic exploded view of an embodiment of a drainage set according to the invention;

Figure 2 is a schematic side view of the drainage device of the

Drainage sets according to Figure 1 in the end position;

Figure 3 is a schematic perspective view of the reservoir of the

Drainage device according to Figure 1 in an expanded, relaxed state; and

Figure 4 is a schematic side view of the drainage device of Figure 1 in the starting position.

1 shows an embodiment of a drainage set 5 according to the invention. The drainage set 5 consists of a drainage device 1, one

Hose element 2 and a securing element 3.

The drainage device 1 consists of a reservoir 10, a cover plate 1010, a base plate 1020 and a swivel joint 12, which is shown in FIG

Embodiment is formed by two springs 120 in the form of leg springs. As can be seen from FIG. 3, the reservoir 10 has a cover 101 with a valve 103 and a base 102 (not visible in FIG. 3) and a surrounding wall 105 which extends between the cover 101 and the base 102. The surrounding wall 105 is deformable and is shown in that in the figures

Embodiment completely formed by a bellows 1000. The reservoir 10 has an oval cross section. The valve 103 is introduced in the cover 101 and in the illustrated embodiment in particular in the dome 104 of the cover 101 and extends from there upwards.

In the embodiment shown, the swivel joint 12 is formed by two springs 120 in the form of leg springs which are arranged parallel to one another. The axes of rotation of the leg springs lie in a line. One leg of each of the springs 120 engages the lid 101 of the reservoir and the other leg of each of the springs 120 engages the bottom 102 of the reservoir 10. Thus, the swivel joint 12 formed by the springs 120 connects the lid 101 and the bottom 102 of the reservoir 10 to one another. The springs 120 are on one side of the

Reservoirs 10 arranged and thus connect the bottom 101 and the lid 102 of the reservoir 10 on one side of the surrounding wall 105.

The cover plate 1010 is attached to the cover 101 of the reservoir 10. For this purpose, the cover 101 of the reservoir 10 has, for example, a dome 104, shown schematically in FIG. 3. A corresponding recess (not shown) is made in the cover plate 1010 in the underside, in which the tip 104 engages and latches. In addition, the cover plate 1010 has grooves 1012 for receiving the upper legs of the leg springs 120. The upper legs of the leg springs 120, which form the pivot joint 12, are thus between the cover 101 and the

Cover plate 1010 of the reservoir 10 arranged and act through the fixed

Connection of the cover plate 1010 and the cover 101 to the cover 101 and thus the reservoir 10. A through opening (not visible) for the valve 103, which is arranged on the cover 101 of the reservoir 10, is provided in the cover plate 1010. The bottom plate 1020 is attached to the bottom 102 of the reservoir 10. For this purpose, the bottom 102 of the reservoir 10 has, for example, a dome (not visible) corresponding to the dome 104 shown on the cover 101 in FIG. 3. In the base plate 102, a corresponding recess 1023 (see FIG. 1) is made in the top, into which the dome engages and latches. In addition, the base plate 1020 has grooves 1022 for receiving the lower legs of the

Leg springs 120 on. The lower legs of the leg springs 120, which form the swivel joint 12, are thus arranged between the base 102 and the base plate 1020 of the reservoir 10 and act on the base 102 and thus the reservoir 10 through the fixed connection of the base plate 1020 and the base 102 .

On the side of the surrounding wall 105, which is opposite the side on which the swivel joint 12 is arranged, a clamping device 100 is arranged between the cover 101 and the bottom 102 of the reservoir 10. In the embodiment shown, the jig 100 is supported by a portion of the

Surrounding wall 105 itself formed. In particular, the clamping device 100 is formed by the bellows 1000.

In the area of the clamping device 100, that is to say on the side of the reservoir 10 that lies opposite the swivel joint 12, there is a fastening element 1011, 1021 for each of the bottom plate 1020 and the cover plate 1010

Securing element 3 is provided. In the illustrated embodiment, the respective fastening element 1011, 1021 by a pin that is different from the

Bottom plate 1020 or the cover plate 1010 extends in the direction of the surface to the outside. The securing element 3 can be fastened to these fastening elements 1011, 1021. For this purpose, in the embodiment shown, the securing element 3 has two openings, in each of which one of the fastening devices 1011, 1021 can engage. In Figure 4, the drainage device 1 is shown in an initial position. In this position, the lid 101 and the bottom 102 of the reservoir 10 are parallel to one another and a short distance from one another. The base plate 1020 and the cover plate 1010 are parallel to one another. The surrounding wall 105 of the reservoir 10 lies compressed between the bottom 102 and the cover 101. In the embodiment shown, the bellows 1000, which forms the surrounding wall 105, is compressed. The leg springs 120 are in the

Starting position tensioned and exert a compressive force on cover 101 and base 102 which is directed onto cover 101 and base 102 and is therefore designed to push base 102 and cover 101 apart. In FIG. 4, the securing element 3 is attached to the fastening elements of the cover plate 1010 and the base plate 1020. This counteracts the force of the leg springs 120 and the force of the bellows 1000, which they exert on the lid 101 and the bottom 102, and the drainage device 1 is held in the starting position.

2 shows the drainage device 1 in the end position. In this position, the leg springs 120 are relaxed and there is an angle a of, for example, 70 ° between the legs of each spring 120. The clamping device 100, that is to say the part of the bellows 1000 which lies opposite the leg springs 120, is also relaxed. The folds of the bellows 1000 are stretched in the region of the clamping device 100. The folds of the bellows 1000 are further compressed in the region of the leg springs 120. In the embodiment shown, a hose element 2 is attached to the valve 103 on the cover 101 of the reservoir 10, in which a further check valve (not shown) can be provided.

The operation of the drainage device 1 will now be explained again with reference to the figures. The drainage device 1 is preferably delivered in the starting position.

In this starting position, the valve 103 can be closed with a detachable cap (not shown). The patient can remove the cap and the

Attach the drainage device 1 to the tube element 2 and above it to the implanted permanent catheter (not shown) or, in the case of drainage of, for example, blood or urine, to a temporarily inserted catheter. For this purpose, the patient puts the hose element 2 on the valve 103 on the lid 101 of the reservoir 10. Now the securing element 3 is removed from the fastening elements 1011, 1021 of the lid 101 and bottom 102. In this state, the spring force of the leg springs 120 and the tensioning force of the compressed bellows 1000 in the area of the clamping device 100 can move the cover 101 and base 102 away from one another. By means of the leg springs 120, which form the swivel joint 12, the base 102 and cover 101 execute a pivoting movement relative to one another, that is to say the drainage device 1 is opened. As a result, the reservoir 10 is spanned. This clamping and there is a constant increase in volume inside the reservoir 10. The driving force F for

Clamping the reservoir 10 follows the spring law according to Hook with F = k - 5.1 and k = spring constant, I = spring deflection. In addition, the bellows 100 acts as a further force due to its preload. Through the linear

In relation to the force and spring deflection of the leg springs 120 or the tensioning of the bellows 1000, a volume-independent, constant suction is built up. In this way, an effusion can be reliably conducted from the body cavity via the catheter and the tube element 2 into the reservoir 10. In addition to the suction created by the increase in volume in the reservoir 10, when the drainage device 1 is arranged below the level of the effusion, gravity also acts to introduce the effusion into the reservoir 10.

As soon as the drainage device 1 has reached the end position, which is shown in FIG. 2, the bellows 1000 are not clamped further. The movement of the cover 101 and the bottom 102 relative to one another and thus the clamping of the bellows 1000 is limited by the leg springs 12. After the drainage of the effusion or other body fluids has ended, the patient can separate the hose element 2 from the valve 103 of the drainage device 1. The drainage device 1 can be emptied in this separated state. For this purpose, the clamping device 100 can be applied to the area of the cover 101 that lies opposite the pivot joint 12

be squeezed together. Due to the pressure force that is applied and the associated reduction in the internal volume of the reservoir 10, the content of the reservoir 10 exerts pressure on the valve 103 of the drainage device 1 from the inside. If the pressure is sufficiently high, the contents of the

Reservoirs 10 allows via the valve. If the valve 103 is designed as a non-return valve, this is removed, for example cut off, before the patient applies the force to the area of the cover 101 which is opposite the swivel joint 12. As soon as the drainage device 1 has reached its starting position shown in FIG. 4, the securing element 3 can be fastened to the lid 101 and bottom 102 and the drainage device 1 can thus be held in the starting position. In this position, the drainage device 1 can be disposed of, with only a small space requirement.

The present invention thus creates a drainage device with which large-volume effusions or large amounts of other body fluids can be drained off with constant suction and increased flow rates.

In particular, a reservoir for the active drainage of liquids from the abdominal (or pleura) space is created, in which an essentially constant and volume-independent suppression is generated. The suppression is generated by a mechanical spring system. The spring system preferably comprises at least one bellows. In addition, the spring system preferably has an additional arrangement for generating a mechanical one

Restoring force a spring, for example a leg spring, spiral spring,

Lamellar spring, or the like. The spring can also be used as a return spring be designated. This arrangement for generating a restoring force is preferably arranged outside the liquid collecting space, that is to say the reservoir. The reservoir preferably has a check valve that prevents air or effusion from flowing back into the body.

A solution according to the invention provides, in particular, for the use of a prestressed spring system in which, after an initial securing has been released, the spring system, in particular the securing element, moves away from the

Fasteners, independently relaxed and so for a constant

Volume increase of the over the hose element, which also as

Catheter connection tube can be referred to, which ensures that the effluent is connected to the effusion and sealed in an airtight manner.

The absolute drainage time is the integral of the flow rate. It has been shown that with the present invention one of the vacuum drainage

comparable flow rate can be achieved with significantly lower suction, so that the force of the spring system can be adjusted so that the suction is in the range of -150 mbar, for example. With such negative pressures, the risk of tissue suction is extremely low, the drainage times are about half as high as with gravity systems and thus correspond to those with

High vacuum systems can be achieved.

The present invention thus has a number of advantages over systems based on negative gas pressure due to the hyberbolic pV characteristic of these systems. The invention also has a number of advantages over gravity bags. Reference list

1 drainage device 10 reservoir

100 clamping device 1000 bellows

101 lid

1010 cover plate

1011 fastener

1012 groove

102 floor

1020 base plate

1021 fastener

1022 groove

1023 recess

103 valve

104 crest

105 surrounding wall 12 swivel joint

120 spring (leg spring)

2 hose element

3 securing element

5 drainage set

Claims

claims

1. Active drainage device comprising:

- A reservoir (10) with a lid (101), a bottom (102), one extending between the lid (101) and the bottom (102)

Surrounding wall (105), which is elastically deformable, and a valve (103) on the cover (101),

at least one swivel joint (12) which connects the lid (101) and the bottom (102) of the reservoir (10) to one side of the surrounding wall (105),

- At least one clamping device (100), which is at least on one side of the surrounding wall (105), which is opposite to the side on which the swivel joint (12) is arranged, between the cover (101) and the bottom (102) of the

Reservoirs (10) is arranged,

wherein in an initial position of the drainage device (1)

Surrounding wall (105) between the lid (101) and the bottom (102) is compressed and the clamping device (100) in the initial position of the drainage device (1) is biased towards the lid (101) and the bottom (102).

2. Drainage device according to claim 1, characterized in that the

Swivel joint (12) limits the pivoting movement of the cover (101) and the bottom (102) of the reservoir (10) to one another to a maximum angle, preferably less than 90 °.

3. Drainage device according to one of claims 1 and 2, characterized

characterized in that the swivel joint (12) represents a spring (120), in particular a leg spring.

4. Drainage device according to one of claims 1 to 3, characterized in that the swivel joint (12) is arranged outside the reservoir (10).

5. Drainage device according to one of claims 1 to 4, characterized in that the clamping device (100) is formed by the material of the reservoir (10).

6. Drainage device according to claim 5, characterized in that the

Clamping device (100) represents a bellows (1000) which forms at least part of the surrounding wall (105) of the reservoir (10).

7. Drainage device according to one of claims 5 or 6, characterized

characterized in that the clamping device (100) extends over the entire surrounding wall (105).

8. Drainage device according to one of claims 1 to 7, characterized in that the clamping device (100) comprises a spring element in the form of a compression spring.

9. Drainage device according to one of claims 1 to 7, characterized in that the drainage device (1) in the region of the clamping device (100) has fastening elements (101 1, 1021) for fastening a securing element (3) to the drainage device (1).

10. Drainage device according to one of claims 1 to 9, characterized in that the drainage device (1) on the lid (101) of the reservoir (10) has a cover plate (1010) and on the bottom (102) has a base plate (1020) and Cover plate (1010) and the base plate (1020) are made of rigid material.

1 1. Drainage device according to one of claims 1 to 10, characterized

characterized in that the cross section of the reservoir (1) represents an oval or a rectangle with a length greater than width.

12. Drainage set, characterized in that the drainage set (5) comprises at least one drainage device (1) according to one of claims 1 to 10.

13. Drainage set according to claim 11, characterized in that the drainage set (5) comprises a reading scale which is arranged or can be arranged on the reservoir (10) and which allows the liquid level to be read independently of the liquid level.