An improved multi-way bladder catheter

Abstract

The present disclosure is enclosed in the area of multi-way bladder catheters, which are suitable for draining urine and / or blood and / or instillation liquid from the bladder of a patient. It refers to a bladder catheter (1) in which a furcation element (8) external to a tube (30) of the catheter (1) connects an instillation inlet (2) to several instillation channels (12) which in turn connect to instillation outlets (3), providable inside a bladder, and such that instillation liquid injected in the instillation inlet (2) is furcated to the instillation channels (12) through the furcation element (8) and ejected from each of the instillation outlets (3). It guarantees that no change of procedure is required for a practitioner, in a simplified manner and providing an enhanced elimination of clogs.

Description

[0001] DESCRIPTION

[0002] AN IMPROVED MULTI-WAY BLADDER CATHETER

[0003] FIELD OF THE INVENTION

[0004] The present invention is enclosed in the area of multi-way or multi-channel bladder catheters, which are suitable for draining urine and / or blood from the bladder of a patient.

[0005] PRIOR ART

[0006] The formation of clots within the bladder is a major problem in medicine. Clot formation occurs by the presence of blood within the bladder, either in catheterised or non- catheterised patients, after surgery (urological or otherwise) or in other contexts.

[0007] The causes of bleeding into the bladder are varied, from very frequent and serious tumours of the bladder, kidneys or ureters, to benign diseases, also very common, such as prostate diseases, lithiasis (urinary stones), infections, other diseases of the kidneys and ureters, systemic diseases like haematological disorders and secondary to several treatments and medicines, among others. This type of haemorrhage is almost universal in the postoperative period of multiple urological surgeries.

[0008] This problem occurs both in the hospital / inpatient setting and in the outpatient setting, outside the health facility setting (i.e., with outpatients), resulting in many patients having to be treated and catheterised as a result of bleeding.

[0009] Many are the cases in which patients are catheterised because they cannot urinate, but also as many are the other medical situations where such devices are required - for example, to measure the amount of urine produced. Presently, patients are being given medications to fight the formation of thrombi (which cause strokes), such as antiplatelet agents and anticoagulants. These drugs further contribute to urinary haemorrhage and an increased risk of clot formation and clogging of catheters. An additional, unsolved, problem is the frequent and recurrent obstruction of the catheter (catheters for bladder drainage, to drain the urine inside this organ), specifically the clogging caused by clots in these catheters, which consist of a major cause of suffering to the catheterised patient, namely severe pain and discomfort due to bladder distension. This clogging significantly increases the risk of trauma to the urinary tract and infection, by the manipulation which the clearing of the clot in the catheter requires, namely by means of vesical washing, instillation of liquid into the bladder, replacements of catheter, etc.

[0010] This seemingly simple problem consumes countless resources, both from health professionals (doctors and nurses, operating assistants) and from equipment, devices and accessories. It consists, moreover, of a cause of pronounced suffering of the affected patients (by stopping the correct emptying of the bladder and sensation of repletion that is thereby caused), with intense pain.

[0011] This problem also increases the risk of hospital infection, the length of hospital stay, and of the number and severity of associated complications. By increasing the time patients are bedridden, the number of manoeuvres and manipulations related to the catheter (such as continuous and manual washes) triggers the risk of thromboembolic complications, infectious, traumatic complications for the urinary tract and consumption of medicaments, among others.

[0012] Catheters which provide active drainage of the bladder are known in the art, namely three-way catheters in which an instillation liquid is provided through the catheter and into the bladder, such liquid and the contents of the bladder then exiting the bladder through one or more drainage openings formed in the catheter tip and connected to another (drainage / outlet) way.

[0013] Thus, a first way of such catheters is used for introducing instillation liquid. The catheter thus has an inlet provided in one outer edge / proximal tip and connected to the instillation way, which then is connected to an outlet in the opposite edge - an inner edge / distal tip - of the catheter. The instillation way connects the instillation inlet to the instillation outlet. When the catheter is applied to a patient, the distal tip will be provided in the patient, while the proximal tip will be provided out, thereby being handled by a practitioner.

[0014] A second way of such catheters is used for draining urine from the bladder. The catheter thus has an inlet provided in the inner edge and connected to the drainage way, which then is connected to an outlet in the opposite edge - the outer edge - of the catheter. The drainage way connects the drainage inlet or inlets to the drainage outlet.

[0015] Additionally, they comprise a way for inflating a balloon, (which is also present in two- way catheters, which do not provide liquid instillation to the bladder, containing only the drainage way and the balloon way). An inlet is provided in the outer edge which is connected to the balloon way for inflation, which then is connected to the balloon, which in turn is provided between the inner and outer edges of the catheter, closer to the inner edge. A fluid (e.g., sterile water) may be provided through the inflation inlet and the balloon is inflated, thus retaining the catheter inside the bladder until the balloon is deflated.

[0016] Typically, the catheter has an outer wall and the drainage way if provided centrally inside the wall, wherein it is surrounded by the wall. The wall has a certain thickness, and the instillation way is provided in the wall, inside such thickness. The section of the drainage way is typically larger than the section of any other way provided in the wall, such as the instillation way. The way connected to the balloon is, as the instillation way, provided in the wall of the balloon. In the inflation inlet, a valve is provided, to maintain the balloon inflated. The balloon way connects the inflation inlet to the balloon.

[0017] There also exist four-way balloons, which comprise duplicated ways. Thus, for instance, a second balloon may be provided, with the respective inflation inlet and valve, and a way connecting the second inflation inlet and the second balloon. In addition, a second drainage or instillation way may be provided. Thus, a second drainage o utlet / i nsti I lation inlet exists in the outer edge of the catheter, and a second drainage inlet / instillation outlet in the inner edge of the catheter. This way connects the inner hole to the outside outlet / inlet hole.

[0018] The catheters known in the art thus allow to have a number of ways adapted to the desired application.

[0019] Still, the multi-way catheters having four or more ways have a particularly cumbersome usage, since they require a rather synchronized usage of the duplicated ways. For instance, a practitioner may have to actuate two instillation inlets simultaneously, such that two instillation outlets are simultaneously irrigating the bladder and the prostatic urethra. This activity requires either a great expertise of the practitioner or that several practitioners are performing the act. Otherwise, the effect of having two instillation ways is lost.

[0020] In an innovative manner, the present disclosure provides simplified solutions for such problems. It further provides a facilitated, continuous and abundant elimination of both liquid and any small clots that are present or formed in the bladder, whichever is the relative position of such elements, in particular clots, with regard to the catheter.

[0021] SUMMARY OF THE INVENTION

[0022] The present disclosure refers to a bladder catheter which comprises a drainage outlet and a tube. The tube has:

[0023] - a drainage channel formed within the tube and one or more drainage inlets, the drainage channel connecting the drainage outlet and the drainage inlet, and

[0024] - more than one instillation channels formed within the tube and more than one instillation outlets.

[0025] The catheter further comprises:

[0026] - an instillation inlet, - a furcation element external to the tube and connecting the instillation inlet to the instillation channels, the instillation inlet and the drainage outlet are provided in a first edge portion of the catheter and the instillation outlets and the drainage inlet are provided in a second edge portion of the catheter, opposite to the first edge portion, wherein each of the instillation channels connects to an instillation outlet, providable inside a bladder such that instillation liquid injected in the instillation inlet is furcated to the instillation channels through the furcation element and ejected from each of the instillation outlets.

[0027] The furcation element may connect the instillation inlet to the instillation channels through more than one instillation openings formed in the wall of the tube, wherein each instillation opening formed in the wall of the tube is in connection with an instillation channel.

[0028] The furcation element may comprise a chamber connecting the instillation inlet to all of the instillation openings formed in the wall of the tube, such that instillation liquid injected in the instillation inlet is furcated to the instillation channels by the chamber and through the instillation openings formed in the wall of the tube.

[0029] The furcation element may be formed as a hollow cylinder or prism having a longitudinal through-hole, the tube passing through the through-hole such that the instillation openings formed in the wall of the tube are in connection with the chamber.

[0030] The furcation element may be configured to provide bifurcation, trifurcation or n- furcation, n consisting of an integer higher than 3.

[0031] The furcation element may be configured to provide bifurcation, trifurcation or n- furcation and the catheter correspondingly has two, three or n instillation outlets and corresponding instillation channels. The instillation outlets and each corresponding instillation channel may be arranged such that instillation liquid is ejected perpendicularly to the wall of the tube.

[0032] An end of each portion of an instillation channel connecting to an instillation outlet may be blocked, such portion of the instillation channel thereby not extending beyond a corresponding instillation outlet.

[0033] The blockage of each of the several instillation channels distally to the instillation outlets may be provided by means of beading, or by any other means.

[0034] The instillation outlets may be provided along the second edge portion in a same position of the extension of the catheter, such that the extensions of each of the several portions connecting to an instillation outlet are the same, thus instillation liquid being ejected at a same extension of the length of the catheter.

[0035] The drainage channel may be provided centrally and surrounded by the wall of the tube, such wall having a thickness, the instillation channels being provided inside the wall of the tube.

[0036] Each instillation channel may be evenly provided in the wall of the tube.

[0037] The instillation outlets may have a stadium, a round, or an oval shape.

[0038] The catheter may further comprise an inflation inlet, an inflation channel and a balloon, the inflation channel being formed within the tube and connecting the inflation inlet to the balloon, such that a fluid provided through the inflation inlet inflates the balloon, the catheter further comprising a valve provided between the inflation inlet and the inflation channel, the valve having a minimum pressure threshold which prevents the balloon from deflating. The balloon may be provided between the first edge portion and the second edge portion, closer to the second edge portion.

[0039] The wall of the tube may be made of latex, silicone or a silicone polymer, optionally an inert silicone polymer.

[0040] DESCRIPTION OF FIGURES

[0041] Figure la - a side view of a catheter (1) according to the present disclosure.

[0042] Figure lb - a side view of the catheter of figure la, showing a cross-section of the furcation element (8).

[0043] Figure 2 - a cross-section view of a catheter (1) according to the present disclosure, showing three instillation channels (12) and one inflation channel (13) formed within the wall of the tube and one drainage channel (11) formed centrally in the tube of the catheter (1).

[0044] Figure 3 - a view from perspective of a catheter (1) of figure la.

[0045] Figure 4 - a side view of second embodiment of a catheter (1) according to the present disclosure, containing several drainage inlets (3) connected to the drainage channel (11) and in which one of the instillation inlets (4) connected to a respective instillation channel (12) is represented.

[0046] Figure 5 - a view from perspective of the catheter (1) of figure 4. Instillation inlets (4) are not shown.

[0047] DETAILED DESCRIPTION

[0048] The present disclosure refers to a bladder catheter (1).

[0049] Figures 1-5 are used to refer to the several elements of the bladder catheter.

[0050] It comprises a drainage outlet (5) and a tube, the tube in turn comprising a drainage channel (11) and a drainage inlet (4) (or more), the drainage channel (11) connecting the drainage outlet (5) and the drainage inlet (4). These three elements: drainage outlet (5), drainage channel (11) and drainage inlet (4), which are directly connected to each other, provide the part of a circuit formed by the catheter (1) which removes urine and / or blood from the bladder. Upon instillation or irrigation of the bladder, the instillation liquid runs across the inside of the bladder and mixes with its content. The mixed liquid will then enter the drainage inlet (4), cross the drainage channel (11) and exit the catheter (1) via the drainage outlet (5), provided at the end of the catheter (1), in an outer edge or proximal edge, a second edge portion (20) of the catheter (1). The drainage inlet (4) is provided at an inner edge / distal tip or close to an inner edge, which comprises the so called insertion tip of the catheter (1), a first edge portion (10) of the catheter (1).

[0051] The catheter (1) further comprises an instillation inlet (2), more than one instillation outlet (3), providable inside the bladder of a patient, and more than one instillation channels (12).

[0052] The instillation inlet (2) and the drainage outlet (5) are provided in a first edge portion (10) of the catheter (1) and the instillation outlets (3) and the drainage inlet (4) are provided in a second edge portion (20) of the catheter (1), opposite to the first edge portion (10).

[0053] A furcation element (8) external to the tube (30) connects the instillation inlet (2) to the instillation channels (12) and each of the instillation channels (12) connects to an instillation outlet (3), such that instillation liquid injected in the instillation inlet (2) is furcated to the instillation channels (12) through the furcation element (8) and ejected from each of the instillation outlets (3).

[0054] By comprising more than one instillation outlet (3), the catheter (1) provides that instillation liquid better spreads through the bladder.

[0055] The circuit formed by the instillation inlet (2), the furcated element (8) and instillation channels (12) has a portion with a single way connected to the instillation inlet (2), which furcates into two or more instillation channels (12) by means of the furcated element (8).

[0056] Each instillation channel (12) connects to an instillation outlet (3), wherein the furcated element (8) is such that liquid entering the instillation inlet (2) is furcated to each of the instillation channels (12). Thus, a cross-section of the tube (30) as of Figure 2 shows a way corresponding to the drainage channel (11) (preferably provided centrally and surrounded by an outer wall) and the more than one ways corresponding to the several instillation channels (12) [preferably in the outer wall, thus peripherally as regards the drainage channel (11)].

[0057] The furcation element (8) is so configured that instillation liquid injected in the instillation inlet (2) is furcated and ejected from each of the instillation outlets (3). The route that the instillation liquid follows is thus the following: being injected in a single instillation inlet (2), crossing the furcation element (8) and into the instillation channels (12), crossing each instillation channel (12) and exiting the catheter (1) via each of the instillation outlets (3), into the bladder and mixing with its content. The drainage process previously described then follows.

[0058] The furcation element (8) may be defined as a branched channel, which in connection with the tube (30) of the catheter (1) divides the liquid entering the single instillation inlet (2) into the several instillation channels (12), thus having a single way which furcates into two or more ways.

[0059] The first edge portion (10) corresponds to a so-called outer edge portion or proximal tip, the portion of the catheter (1) which the practitioner handles (outside the patient) when the catheter (1) is provided inside a patient. The second edge portion (20) corresponds to a so-called inner edge portion or distal tip, the portion of the catheter (1) which comprises the insertion tip and which is provided inside a patient when in use. The tube (30) of the catheter (1) has a wall, wherein the several channels are provided within such wall. Instillation channels (12) are provided in the wall and a drainage channel (11) may be provided centrally in the tube (30) wall. Instillation outlets (3) are provided along the second edge portion and consist of openings in the wall.

[0060] As previously referred, prior art multi-way catheters have a particularly cumbersome usage, since by having more than one instillation inlet, they require the simultaneous actuation of the several inlets. The catheter (1) of the present disclosure is a multi-way catheter, having several ways - the instillation channels (12) - provided in it due to its furcation and thereby providing the injection of instillation liquid in a bladder by means of the several instillation outlets (3), but at the same way also behaving as a single way for instillation, from the point of view of its operation by a practitioner. This means that it guarantees that no change of procedure is required, since the drainage outlet (5) and the single instillation inlet (2) are exactly the same for a regular prior art catheter, as those previously described. In addition, the provision of an external furcation element (8) provides a simplified construction of the catheter (1).

[0061] Thus, a practitioner using the catheter (1) of the present disclosure can irrigate a bladder by means of several instillation outlets (3) while operating a single instillation inlet (2), thereby being of a much easier operation when compared with prior art multi-way catheters, while keeping a simplified construction.

[0062] The furcation element (8) may connect the instillation inlet (2) to the instillation channels (12) through more than one instillation openings (16) formed in the wall of the tube (30). Such arrangement provides a simplified construction, since the tube (30) only has to be formed as a multi-way tube in which openings (16) are proximally provided. Each of such instillation openings (16) formed in the wall of the tube (30) is in connection with an instillation channel (12).

[0063] As represented in Figure lb, the furcation element (8) may comprise a chamber (15) connecting the instillation inlet (2) to all of the instillation openings (16) formed in the wall of the tube (30), such that instillation liquid injected in the instillation inlet (2) is furcated to the instillation channels (12) by the chamber (15) and through the instillation openings (16) formed in the wall of the tube (30). Such is solution provides an improved simplification of the construction of the catheter (1), as the chamber (15) may directly and evenly connect the single instillation inlet (2) to the instillation channels (12), without requiring an alignment with the instillation openings (16) formed in the wall of the tube (30). Instillation liquid may thus be provided through the instillation inlet (2), filling the chamber (15) and therefrom enter the instillation openings (16) formed in the wall of the tube (30) and the instillation channels (12). Pressure applied by instillation means such as a syringe leads to the instillation liquid ejecting from the instillation outlets (3) into a bladder.

[0064] As provided in the figures, the furcation element (8) may be formed as a hollow cylinder (or prism) having a longitudinal through-hole, the tube (30) passing through the through-hole such that the instillation openings (16) formed in the wall of the tube (30) are in connection with the chamber (15). Such arrangement further simplifies the proximal access to the drainage outlet (5) (and, if it is the case, the inflation inlet (6) and the instillation inlet (2).

[0065] The furcation element (8) may be configured to provide bifurcation, trifurcation or n- furcation, n consisting of an integer higher than 3. In a case where it provides trifurcation, the catheter (1) will have three instillation outlets (3) and three instillation channels (12), each connecting the furcation element (8) to a corresponding instillation outlet (3).

[0066] The instillation outlets (3) and each corresponding instillation channel (12) may be arranged such that instillation liquid is ejected perpendicularly to the wall of the tube (30).

[0067] Such arrangement provides a facilitated, continuous and abundant movement of the content inside the bladder (urine, blood and instillation liquid) and eases and facilitates the subsequent elimination of both liquid and any small clots that are present or formed in the bladder, whichever is the relative position of such elements, in particular clots, with regard to the catheter (1). As previously referred, the catheter (1) allows for a practitioner to actuate a single instillation inlet (2). In addition, the several distributed instillation outlets (3), which eject instillation liquid perpendicularly to the outer wall, allowforthe liquid to better distribute and run across the bladder, thereby better mixing with its content, and allowing a better drainage.

[0068] An end of each portion of an instillation channel (12) connecting to an instillation outlet (3) may be blocked, in a way that the portion of the instillation channel (12) does not extend beyond a corresponding instillation outlet (3). Such blockage enables that the pressure with which the instillation liquid runs inside each instillation channel (12) is fully and directly transferred to the ejection, by means of the blockage, which does not extend beyond the respective outlet (3).

[0069] The blockage of each of the several instillation channels (12) beyond the instillation outlet (3) may be provided by means of beading, or by any other means, of the instillation channel (12). The instillation channel (12) may thus be formed along the extension of the tube (30) of the catheter (1), wherein after the instillation outlet (3) it is blocked by beading, or by any other means.

[0070] The instillation outlets (3) may be provided along the edge portion in different positions of the extension of the catheter (1). This allows for a better distribution of instillation liquid throughout the bladder. Figure 1 shows these different positionings.

[0071] The instillation outlets (3) may be provided along the second edge portion in a same position of the extension of the catheter (1), such that the extensions of each of the several portions connecting to an instillation outlet (3) are the same, thus instillation liquid being ejected at a same extension of the length of the catheter (1). The drainage channel (11) may be provided centrally and surrounded by the wall of the tube (30), such wall having a thickness, each instillation channel (12) being provided inside the wall of the tube (30), wherein this arrangement provides a higher simplicity of construction (and an adequate drainage capability of the bladder content), which is particularly suitable forthe arrangement of the instillation channels (12). The instillation channels (12) are provided in the wall of the tube (30), within its thickness.

[0072] The instillation channels (12) connecting to an instillation outlet (3) may be evenly provided in the wall of the tube (30). Thus, for instance, if two instillation outlets (3) and two instillation channels (12) are provided, a cross-section of the catheter (1) will show the drainage channel (11) provided centrally and two instillation channels (12) provided inside the wall of the tube (30), the two instillation channels (12) being equidistantly provided. If three instillation outlets (3) and three corresponding instillation channels (12) are provided, a cross-section of the catheter (1) will show the drainage channel (11) provided centrally and three instillation channels (12) provided inside the wall of the tube (30), the three instillation channels (12) being equidistantly provided in the wall, the distance (and angle, 120°) between each two being the same. This arrangement enhances the distribution of instillation liquid inside the bladder, making the effectiveness of the catheter (1) independent of its positioning in the patient. For instance, it could happen that a certain placement would result in an area not being irrigated, as to such area would not correspond an instillation outlet (3). This typically occurs when the patient is laying down or seated. With such equidistant arrangement, all sections / parts of the bladder will better be run across with instillation liquid, assuring the most efficacious induction of movement inside the bladder, avoiding clot formation and its serious consequences and complications.

[0073] The instillation outlets (3) may have a stadium, a round, an oval, or other shape.

[0074] An instillation inlet (2) may be directly connected to the furcation element (8), for instance protruding from it, as represented in figures 1 and 3. The catheter (1) comprises an inflation inlet (6), an inflation channel (13) and a balloon (7), the inflation channel (13) being formed within the tube (30) and connecting the inflation inlet (6) to the balloon (7), such that a fluid provided through the inflation inlet (6) inflates the balloon (7), the catheter (1) further comprising a valve (14) provided between the inflation inlet (6) and the inflation channel (13), the valve (14) having a minimum pressure threshold which prevents the balloon (7) from deflating.

[0075] Thus, to the inflation channel (13), a further way will be provided. This means that, a cross-section of the catheter (1) will show a way corresponding to the drainage channel (11) (preferably provided centrally and surrounded by the wall of the tube (30)), the instillation channels (12) [preferably inside the wall of the tube (30), thus peripherally as regards the drainage channel (11)], and the single way of the inflation channel (13) [preferably in the wall of the tube (30), thus also peripherally as regards the drainage channel (11)].

[0076] The balloon (7) may be provided between the first edge portion (10) and the second edge portion (20), closer to the second edge portion (20). The balloon (7) may also be provided between the first edge portion (10) and the second edge portion (20), closer to the first edge portion (10) and proximally [closer to the first edge portion (10)] to / than the furcation.

[0077] The wall of the tube (30) may be made of latex, silicone or a silicone polymer, optionally an inert silicone polymer.

[0078] Such constructional elements allow, further to the described advantages, to provide a catheter (1) with the same external gauge as other multi-way catheters known in the art. For instance, a catheter (1) according to the present disclosure with three instillation channels (12) has a same external gauge as a three-instillation channel catheter (1) known in the art. This is also provided while the drainage channel (11) is particularly wide. As will be clear to one skilled in the art, the present invention should not be limited to the embodiments described herein, and a number of changes are possible which remain within the scope of the present invention. Of course, the preferred embodiments shown above are combinable, in the different possible forms, being herein avoided the repetition all such combinations.

Claims

CLAIMS1. A bladder catheter (1) characterised in that it comprises a drainage outlet (5) and a tube (30), the tube (30) having:- a drainage channel (11) formed within the tube (30) and one or more drainage inlets (4), the drainage channel (11) connecting the drainage outlet (5) and the drainage inlet (4), and- more than one instillation channels (12) formed within the tube (30) and more than one instillation outlets (3), the catheter (1) further comprising:- an instillation inlet (2),- a furcation element (8) external to the tube (30) and connecting the instillation inlet (2) to the instillation channels (12), the instillation inlet (2) and the drainage outlet (5) are provided in a first edge portion (10) of the catheter (1) and the instillation outlets (3) and the drainage inlet (4) are provided in a second edge portion (20) of the catheter (1), opposite to the first edge portion (10), wherein each of the instillation channels (12) connects to an instillation outlet (3), providable inside a bladder such that instillation liquid injected in the instillation inlet (2) is furcated to the instillation channels (12) through the furcation element (8) and ejected from each of the instillation outlets (3).

2. A catheter (1) according to the previous claim wherein the furcation element (8) connects the instillation inlet (2) to the instillation channels (12) through more than one instillation openings (16) formed in the wall of the tube (30), wherein each instillation opening (16) formed in the wall of the tube (30) is in connection with an instillation channel (12).

3. A catheter (1) according to the previous claim wherein the furcation element (8) comprises a chamber (15) connecting the instillation inlet (2) to all of the instillation openings (16) formed in the wall of the tube (30), such that instillation liquid injected inthe instillation inlet (2) is furcated to the instillation channels (12) by the chamber (15) and through the instillation openings (16) formed in the wall of the tube (30).

4. A catheter (1) according to the previous claim wherein the furcation element (8) is formed as a hollow cylinder or prism having a longitudinal through-hole, the tube (30) passing through the through-hole such that the instillation openings (16) formed in the wall of the tube (30) are in connection with the chamber (15).

5. A catheter (1) according to any of the preceding claims wherein the furcation element (8) is configured to provide bifurcation, trifurcation or n-furcation, n consisting of an integer higher than 3.

6. A catheter (1) according to the previous claim wherein the furcation element (8) is configured to provide bifurcation, trifurcation or n-furcation and the catheter (1) correspondingly has two, three or n instillation outlets (3) and corresponding instillation channels (12).

7. A catheter (1) according to any of the preceding claims wherein the instillation outlets (3) and each corresponding instillation channel (12) are arranged such that instillation liquid is ejected perpendicularly to the wall of the tube (30).

8. A catheter (1) according to previous claim wherein an end of each portion of an instillation channel (12) connecting to an instillation outlet (3) is blocked, such portion of the instillation channel thereby not extending beyond a corresponding instillation outlet (3).

9. A catheter (1) according to the previous claim wherein the blockage of each of the several instillation channels (12) distally to the instillation outlets (3) is provided by means of beading, or by any other means.

10. A catheter (1) according to any of the claims 7-9, wherein the instillation outlets (3) are provided along the second edge portion in a same position of the extension of the catheter (1), such that the extensions of each of the several portions connecting to an instillation outlet (3) are the same, thus instillation liquid being ejected at a same extension of the length of the catheter (1).

11. A catheter (1) according to any of the preceding claims wherein the drainage channel (11) is provided centrally and surrounded by the wall of the tube (30), such wall having a thickness, the instillation channels (12) being provided inside the wall of the tube (30).

12. A catheter (1) according to the previous claim wherein each instillation channel (12) is evenly provided in the wall of the tube (30).

13. A catheter (1) according to any of the preceding claims wherein the instillation outlets (3) have a stadium, a round, or an oval shape.

14. A catheter (1) according to any of the claims 1-13 wherein it further comprises an inflation inlet (6), an inflation channel (13) and a balloon (7), the inflation channel (13) being formed within the tube (30) and connecting the inflation inlet (6) to the balloon (7), such that a fluid provided through the inflation inlet (6) inflates the balloon (7), the catheter (1) further comprising a valve (14) provided between the inflation inlet (6) and the inflation channel (13), the valve (14) having a minimum pressure threshold which prevents the balloon (7) from deflating.

15. A catheter (1) according to the previous claim wherein the balloon (7) is provided between the first edge portion (10) and the second edge portion (20), closer to the second edge portion (20).

16. A catheter (1) according to any of the claims 1-15 wherein the wall of the tube (30) is made of latex, silicone or a silicone polymer, optionally an inert silicone polymer.

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