WO2008144951A1 - Drainage device - Google Patents

Abstract

The invention relates to a drainage device comprising a check valve with a rigid passage nozzle (21) and a flexible valve hose (26) with a first and a second end. The passage nozzle (21) is arranged at the first open end and two opposite hose walls (260) rest against each other at the second end, characterized in that the two hose walls, in the event of an internal overpressure, depart from one another and open a passage to the first end and close the passage in the event of an external overpressure. The valve has an asymmetrical configuration in a longitudinal center plane and/or is not rotationally symmetrical in relation to its longitudinal center axis in a region outside the tube walls which rest against each other. The inventive check valve prevents bending of the hose ends and thereby increases the operational safety. It is particularly suitable for use in drainage devices.

Description

 drainage device

Technical area

The invention relates to a drainage device according to the preamble of claim 1 or 15.

State of the art

For aspirating body fluids in the medical field, for example, during or after surgical interventions but also in wound drainage, the chest tube or the suction of body fats, collecting containers are used, which are connected on the one hand with a suction pump and on the other hand one with a patient connected drainage line connects. By means of the suction pump is in

A collecting container generates a negative pressure, so that the body fluid can be sucked through the drainage line and collected in the collecting container. Such a drainage container with a rigid lid and flexible bag attached thereto is known for example from EP 0 861 668 and WO 01/24846.

Improper handling may result in already aspirated fluid returning to the drainage tube and to the patient. This happens especially when the line is interrupted. For example, if at the end of a suction forgotten to turn off the suction pump, before the lid of the container is removed or one of the lines is removed, then the liquid injected from the

Container back into the drainage tube. This can have serious health consequences for the patient and / or the medical staff. Thus, WO 2005/087152 proposes to provide a one-way valve with a flat valve membrane in a rigid head part of a drainage bag. A check valve in a drainage device is also known from EP 0 842 674.

Also known in the art of duckbill valves are duckbill valves made of a flexible hose that is beak-shaped at one end; i.e. At this end, two opposite side walls abut each other. Examples of such valves are shown in WO 93/10015, US Pat. No. 6,089,260, WO 2006/054889 and US Pat. No. 5,405,323. However, it has been found that these valves are not functionally reliable, in particular when used with suction pumps and in particular in drainage devices. They tend to invade and thus remain permanently open.

Presentation of the invention

It is therefore an object of the invention to provide a drainage device with a check valve which reliably opens and closes.

This object is achieved by a drainage device having the features of patent claims 1 and 15, respectively.

The inventive drainage device for receiving extracted body fluids has a rigid head part. According to the invention, a check valve described above is arranged in the head part, which has a rigid passage piece and a flexible valve tube having a first and a second end, wherein at the first open end of the passage piece is arranged and at the second end two opposite tube walls abut each other in use, wherein with internal overpressure, move away from one another and open a passage to the first end and close the passage in case of external overpressure. According to the invention, the valve is designed asymmetrically with respect to a plane extending through its longitudinal central axis and / or it is in an area outside the anein- other adjacent tube walls with respect to its longitudinal central axis is not rotationally symmetrical.

Rotationally symmetric is understood here to mean a shape which is invariant to any rotation about its axis of symmetry. Not rotationally symmetrical with respect to the longitudinal central axis thus means that the shape does not remain invariant at all angles of rotation.

It has been shown that a deviation from a rotational symmetry or from a mirror symmetry is sufficient to prevent inversion. It is advantageous that in the Durchgangsöffhung of the valve no harassment must be installed as Umstülpbegrenzer. Such baffles would narrow the cross-section and obstruct the flow. Furthermore, it would increase the risk of clogging by depositing sucked solid particles through them.

The asymmetry is formed in one embodiment by a one-sided reinforcement of one of the two tube walls, wherein the two tube walls are preferably formed in the abutting region each rectangular. Preferably, the reinforcement is applied to an outer side of a hose wall.

This reinforcement supports the closure area of the valve so that the hose ends can not be everted outwards. In another embodiment, both tube walls are provided with a reinforcement as claimed in claim 17.

In another embodiment, the asymmetry is formed by a chamfered end of the passage stub, this end projecting into the valve tube. Preferably, the end is bevelled on one side. The bevel of the rigid outlet nozzle and in particular the one-sided bevel have the advantage that an optimum valve function is ensured. The transition from the constant cross-section of the rigid passage to the valve tube is relatively abrupt and thus has a large difference in stiffness. The bevel reduces the material stress the valve tube.

Preferably, the rigid outlet nozzle is integral with the lid and made of the same material as this one. This facilitates production and reduces its costs.

In a third embodiment, the two embodiments mentioned above are combined.

In further embodiments, a region of the valve has a non-rotationally symmetrical shape outside the adjoining tube walls. Preferably, this area is formed by the end of the Durchlassstutzens, which projects into the valve tube. This area may have a variety of non-rotationally symmetrical shapes along the circumference of the neck, wherein the passage opening of the nozzle itself is not diminished. Preferably, it is round, but it can also be elliptical or oval or have a different shape. These cross-sectional shapes are also possible in the other examples according to the invention. This particular shape of the area can be used instead of or in addition to the asymmetry with respect to a longitudinal center plane, in particular to the one-sided or two-sided reinforced tube walls.

Further advantageous embodiments will become apparent from the dependent claims.

Brief description of the drawings

In the following, the subject invention will be explained with reference to preferred embodiments, which are illustrated in the accompanying drawings. Show it:

1 shows a longitudinal section through a drainage device according to the invention with a check valve according to the invention according to a first embodiment; FIG. 2 shows the lid according to FIG. 1;

FIG. 3 shows an enlarged detail of the cover with check valve according to FIG. 2;

Figure 4 is a perspective view of the lid according to Figure 2;

FIG. 5a shows an enlarged detail of the cover with check valve according to a second embodiment;

Figure 5b is a perspective view of the lid according to Figure 5 a;

FIG. 6a shows an enlarged detail of the cover with check valve according to a third embodiment;

Figure 6b is a perspective view of the lid according to Figure 6a;

FIG. 7a shows an enlarged detail of the cover with non-return valve according to a fourth embodiment;

Figure 7b is a perspective view of the lid according to Figure 7a and

8 shows an enlarged detail of the cover with a check valve according to a fifth embodiment.

Ways to carry out the invention

FIG. 1 shows a drainage device according to the invention. It has a rigid container 1 and a lid 2 hermetically sealing this. On the lid 2, a flexible plastic bag 3 is attached airtight, which projects into the container 1 into it. Container 1 and lid 2 are preferably also made of plastic.

The container 1 has a lateral reinforcement in the form of a thickening 10 on a side wall. In this thickening 10, a means for attaching the container 1 to a patient bed or a rail is arranged. In this example, this means is a resilient clip 11. However, other known means are also usable.

The lid 2 has, as is clearly visible in FIG. 2, a rigid base plate 20 with a circumferential clamping ring 20 '. This clamping ring 20 'can be put over the edge of the container 1 and fasten with suitable fixing means, not shown here, so that it closes the container 1 airtight. In the base plate 20, a patient-side suction port, here in the form of a passage piece 21 is arranged. This connecting piece 21 serves to connect a drainage line, not shown, which leads to the patient at its other end. This passage 21 is part of the inventive check valve and will be described in more detail below in the text. The passage is rigid and preferably has a hardness of 65 to 70 shore D. In this example, it has an inner diameter of approximately 10.2 mm, an outer diameter of approximately 12.8 mm, a total length of approximately 14 mm and a beveled region with a length of approximately 10 mm. Other measures are possible.

In the example shown, a suction port 28 is present in the cover 2. At this suction port 28, a suction line can be connected, which is connected to a suction source. By means of the suction pump, the container 1 and the bag 3 is evacuated so that liquid to be sucked off is sucked by the patient into the bag 3.

The suction opening 25, which is thus located between the interior of the bag and a suction pump, is closed with at least one filter 24 to protect the environment and the pump. This filter 24, here a membrane, is impermeable to liquids but permeable to air. The patient-side passage 21 protrudes beyond the base plate 20 on both sides and thus protrudes into the bag interior. It is rigid and like the other cover parts described above (with the exception of the membrane 24) preferably produced as a one-piece lid 2 by injection molding.

The bag inside end of the passage piece 21 is formed chamfered and thus has an asymmetry with respect to the longitudinal center axis, as can be clearly seen in Figure 3. The chamfer preferably extends at least over a length of the connecting piece 21 which is greater than the inner diameter of the stub 21 in this region. Incidentally, the connecting piece 21 preferably has a constant inner diameter over its entire length.

At this chamfered end of the nozzle 21, a flexible valve tube 26 is arranged, which forms a check valve together with the passage 21. The valve tube is preferably made of polyethylene (PE), silicone or PVC. It preferably has a hardness of 40 to 50 shore D.

The valve tube, prior to its mounting on the nozzle 21, has a preferably hollow-cylindrical basic shape with a diameter that remains constant over its length, whereby side edges may already be formed. It can thus be integrally formed and formed by two, at least in use, one above the other, connected to each other at their longitudinal edges rectangles. The two short longitudinal edges are not connected.

The valve tube has a length of 60 to 80 mm in the examples mentioned here. The wall thickness is preferably about 0.03 mm and the outer diameter is about 12.8 mm. Other measures are possible.

Preferably, it is slipped over the neck 21 with a first open end. He may additionally glued to this, welded to him or otherwise fixed.

This valve tube 26 has a round cross-section at this end on the tube, as can be clearly seen in FIG. Shortly after the bevelled end the tube 26 flattens off and ends with two adjoining side or tube walls 260. The valve tube 26 thus has the shape of a so-called duckbill valve. Preferably, the converging portion of the tube begins shortly after the taper. As with the known duckbill valves, the side walls at an overpressure in the tube or under negative pressure in the bag or container from each other, ie they open the valve, and close at an overpressure in the bag or container. The superimposed area of the side walls is approximately 46 mm. He can also be bigger or smaller. However, the larger this range is, the better the valve action.

The two side walls 26 preferably each have a rectangular shape in their abutting area. These two side walls 26 are reinforced on one side, i. one of the two side walls 26 is provided with a reinforcement 261, the other not. The tube 26 thus also has an asymmetry with respect to its longitudinal central axis. This reinforcement 261 is preferably on the outside of the side wall

260 arranged. It is preferably glued or welded to this outside. This sidewall can also be thickened during production. The reinforcement 261 is preferably also rectangular in shape, having a slightly smaller area than the side wall. The reinforcement 261 is preferably made of PE, silicone or PVC.

The reinforcement preferably corresponds at least once again to a wall thickness. But it can also be more or less.

FIG. 8 shows that both tube walls 260 also have a reinforcement

261 may be provided. In both examples, the reinforcement is preferably rectangular. However, it can also have a different shape. Preferably, it extends over approximately the entire area of a hose wall. However, it can also be considerably smaller. In addition, it does not have to form a closed surface, but may, for example, be grid-shaped. It can also be designed as a strip or as dots. Other shapes are possible. In the figures 5 to 7 still further exemplary embodiments are shown. Again, the tube walls 260 are each reinforced one or two sides. As in the first example, however, only the end of the nozzle 21 may be designed according to the invention and the hose ends 260 are unreinforced.

Common to these examples according to FIGS. 5 to 7 is that the end of the passage piece 21, which projects into the valve tube 26, is not formed rotationally symmetrical with respect to the longitudinal central axis of the valve.

In the example according to FIGS. 5a and 5b, the end 211, in a longitudinal section perpendicular to a plane formed by the two adjacent tube walls 260, forms a V-TaI directed towards the second end with its valley bottom. This means that two mutually opposite tongues 212 project into the valve tube 26 at 90 ° to the adjacent tube walls 260. Preferably, the tongues 212 have the same length, the same width and the same shape. Their free ends are preferably rounded.

In the example according to FIGS. 6a and 6b, the end 213 forms in longitudinal section perpendicular to the plane which is formed by the two adjacent tube walls, a V-shaped mountain which rises up towards the first end. This means that two tongues 212 on each side of the adjoining tube walls 260 protrude into the valve tube 26. These tongues 212 are preferably the same length, the same width, the same shape and formed with rounded ends.

Further rotational positions of the tongues 212 with respect to the adjacent tube walls 260 are possible. In addition, only one protruding tongue or there may be three or more tongues.

In the example according to FIGS. 7a and 7b, the end 214 is crown-shaped. That is, it has teeth 215 which are directed toward the second end. Preferably, the teeth 215 are distributed uniformly over the circumference. she can be dull or pointed. Preferably, all teeth are the same length, the same width and the same shape. There may be a gap between the teeth 215 or they may line up directly.

Instead of the described drainage device, it is also possible to provide a drainage bag according to WO 2005/087152 or a drainage device according to WO 01/24846 or other known drainage devices with the non-return valve according to the invention. It is also possible to use a bag without a container. Furthermore, the head part with through-neck and valve in a lid can be inserted or otherwise attached to this. It is also a rigid container with the headboard used as a lid together with a rigid container, but without a bag.

The inventive check valve prevents everting the hose ends and thus increases safety. It is particularly suitable for use in drainage devices.

Bezugszeichenhste

1 container

10 lateral reinforcement

11 bracket

2 lids

20 base plate

20 'clamping ring

21 Patient-side outlet

210 bevelled end

211 v-valley end

212 tongue

213 mountain-shaped end

214 kronenfb ^'end rmiges

215 tooth

24 membrane

25 Mouth opening

26 valve hose

260 hose wall

261 reinforcement

28 pump-side suction connection

bag

Claims

claims 1. drainage device for receiving sucked body fluids with a rigid head part (2), characterized in that in the head part (2) a Check valve is arranged, wherein the check valve has a rigid passage piece (21) and a flexible valve tube (26) having a first and a second end, wherein at the first open end of the passage piece (21) is arranged and at the second end two opposite tube walls (260 ) abut each other, wherein they remove each other at inside overpressure and open a passage to the first end and close the passage at external overpressure, that the valve is asymmetrical with respect to a longitudinal center plane and / or that it is in an area outside of each other adjacent hose walls (260) with respect to its longitudinal central axis is not rotationally symmetrical. 2. Drainage device according to claim 1, wherein the passage piece (21) is an integral part of the head part (2). A drainage device according to claim 1 or 2, wherein the region is formed by one end (210, 211, 213, 214) of the passage stub (21) which projects into the valve tube (26). 4. A drainage device according to claim 3, wherein the chamfered end extends over a length of the passage piece (21), which at least the inner Diameter of the passage piece (21) corresponds. 5. A drainage device according to claim 4, wherein the end (211) in a longitudinal section perpendicular to a plane formed by the two adjacent tube walls (260) form a directed with its bottom of the valley towards the second end toward V-TaI. 6. A drainage device according to claim 3, wherein the end (213) in a longitudinal section perpendicular to a plane formed by the two contiguous tube walls (260) form a projecting towards the first end V-shaped mountain. A drainage device according to claim 3, wherein the end (214) has teeth (215) directed towards the second end. 8. The drainage device of claim 1, wherein the asymmetry is formed by a one-sided reinforcement (261) of one of the two tube walls (260). 9. Drainage device according to claim 8, wherein the two tube walls (260) are each formed rectangular in the adjacent area. 10. Drainage device according to claim 9, wherein the reinforcement (261) is arranged on an outer side of the hose wall (260). 11. Drainage device according to claim 10, wherein the reinforcement (261) is glued or welded to this outer side. 12. Drainage device according to one of claims 8 to 11, wherein the reinforcement (261) is rectangular. 13. Drainage device according to one of claims 1 to 12, wherein the head part of a rigid container (1) removable cover (2), wherein the lid (2) closes this airtight, and / or wherein the head part (2) airtight Bag (3) is fixed, and wherein the valve tube (26) projects into an interior of the container (1) or in an interior of the bag (3). 14. Drainage device according to one of claims 1 to 13, wherein the passage piece (21) forms a patient-side port. 15. A drainage device for receiving extracted body fluids with a rigid head part (2), characterized in that in the head part (2) a check valve is arranged, wherein the check valve has a rigid passage piece (21) and a flexible valve tube (26) having a first and a second end, wherein at the first open end of the passage piece (21) is arranged and at the second end two opposite tube walls (260) abut each other, wherein they remove each other at inside overpressure and open a passage to the first end and at Close the passage with an overpressure, so that the two adjacent tube walls (260) are reinforced compared to the rest of the tube.