CN215875701U - Extracorporeal drainage system and drainage catheter - Google Patents

Abstract

The utility model relates to an extracorporeal drainage system, characterized in that it comprises: a drainage catheter capable of being at least partially placed within a patient; the drainage bottle is used for temporarily storing the liquid in the body of the patient, which is drained from the drainage catheter; the connecting pipe, the connecting pipe is with drainage catheter and drainage bottle fluid intercommunication, wherein, is equipped with the coupling between drainage catheter and connecting pipe, the coupling constitutes the coupling of two-way to be equipped with the puncture portion that constitutes by thickening structure on drainage catheter's body, puncture portion is made by elastic material. The beneficial effects are that, furthest has avoided the appearance of dead space, reduces or avoids the risk of bacterial growing and patient's infection to practice thrift the cost. The utility model also relates to a drainage catheter.

Description

Extracorporeal drainage system and drainage catheter

Technical Field

The utility model relates to the field of drainage of cerebrospinal fluid and ventricular hemorrhage in neurosurgery, in particular to an in-vitro drainage system and a drainage catheter.

Background

Hypertensive cerebral hemorrhage is a disease with high mortality and disability rate in cerebrovascular diseases, and the disease with high mortality and disability rate seriously threatens the health of people. In addition, a condition of cerebral hemorrhage may also occur in the injured person after an accident, such as a traffic accident. At present, for cerebral hemorrhage, ventricular puncture drainage needs to be performed when necessary to lead out redundant blood liquid and restore normal intracranial pressure.

The existing extracorporeal drainage system is generally connected at the transitional connection part of a pipeline by using a three-way valve, a luer connector and the like, and the three-way valve is also provided with a heparin cap for blood drawing and testing. However, these components are prone to risk bacterial invasion of the drainage line due to improper handling, poor seal protection, and the like. In addition, the heparin cap can have dead space, and the structure gap also can be formed to the inside of three-way valve and its department of being connected with luer, and these dead spaces, structure gap can bring the risk that the bacterium breeds. This results in a significant increase in the chance of bacterial infection to the patient over the drainage time (which usually lasts 3-7 days).

In addition, the drainage holes of the existing ventricular drainage catheter have basically the same size, and the dangerous condition that the drainage catheter is blocked by blood clots due to the design is easy to occur in the drainage process.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to provide an extracorporeal drainage system and a drainage catheter which solve at least one of the above-mentioned problems.

In order to achieve the above object, the present invention provides an extracorporeal drainage system, comprising:

a drainage catheter capable of being at least partially placed within a patient;

the drainage bottle is used for temporarily storing the liquid in the body of the patient, which is drained from the drainage catheter;

a connecting tube that fluidly communicates the drainage catheter and the drainage bottle,

the joint is arranged between the drainage catheter and the connecting pipe, the joint is a two-way joint, a puncture part formed by a thickened structure is arranged on a pipe body of the drainage catheter, and the puncture part is made of elastic materials.

The extracorporeal drainage system has the advantages that, but not limited to, luer connectors, three-way valves, heparin caps and other parts are omitted, so that dead spaces caused by structures of the parts are avoided, the risk of bacterial breeding in the extracorporeal drainage system and infection of patients caused by the bacterial breeding are greatly reduced or avoided, and the part cost is saved.

Advantageously, the extracorporeal drainage system has a drainage bag into which the liquid from the patient's body temporarily stored in the drainage bottle can be discharged, wherein the connection between the drainage bottle and the drainage bag is direct, for example by way of a plastic hose.

Advantageously, the piercing section is formed integrally with the tube, or the piercing section is formed as a separate piercing sleeve which is mounted on the tube.

Advantageously, the piercing portion is provided at a location of the tube that is not to be placed within the patient in use.

Advantageously, the drainage catheter is provided with drainage openings on its body, which are formed in an oval shape.

Advantageously, the plurality of drainage apertures are arranged one after the other in the axial direction of the tube, and the size of the drainage apertures on the distal side of the tube is greater than the size of the drainage apertures on the proximal side of the tube.

Advantageously, the plurality of drainage apertures are arranged in an angular distribution of 180 ° or 120 ° or 90 ° in the circumferential direction of the tubular body.

Advantageously, the drainage catheter is provided with printed scale markings on opposite sides of its body.

Advantageously, the drainage catheter has an insertion head at the distal end of its catheter body, which insertion head is designed as a bullet-shaped or parabolic solid body part.

Advantageously, the drainage catheter has a protective cap on the proximal side of its body, which cap has an opening which is open towards the proximal side and a stopper which can seal off the opening.

Advantageously, the extracorporeal drainage system has a guide pin which forms a stepped tip with its distal end.

Advantageously, a gauze is wound around the junction of the adapter and the drainage catheter and connecting tube.

Advantageously, the connecting tube is made of an elastic material and has a certain extensibility.

Advantageously, a liquid drawing port is arranged on the drainage bottle.

Advantageously, the drawing port is formed by a projecting tube integrally formed on the side wall of the drainage bottle, which tube is in fluid communication with the interior of the drainage bottle at one end and is provided with an opening at its other end that opens away from the side wall of the drainage bottle.

Advantageously, a plug is provided which engages into the opening and seals off the opening, which plug is made of an elastic material and is provided with a nut with an internal thread, which is screwed with its internal thread onto the external thread of the protruding tube.

Advantageously, the nut has an opening at its top, the size of which is smaller than the cross-sectional size of the stopper.

Advantageously, the drainage bottle has an overflow port in its upper portion on the side.

Advantageously, the drainage bottle is in fluid communication with an overflow bag via the overflow port.

Advantageously, the extracorporeal drainage system has a scale with a plurality of scale markings having different scale units.

Advantageously, the extracorporeal drainage system has a rack for holding drainage bottles, the rack being adjustable in relative position with respect to the scale.

Advantageously, the scale has an elongated slot, and the carrier can be guided or fixed in a movable manner relative to the scale by means of a carrier fixing bolt projecting into the slot.

Advantageously, a scale indication cross-bar is provided on the hanger, which scale indication cross-bar indicates a corresponding scale on the scale.

Advantageously, a connecting tube retaining clip is provided on the scale, which retains the connecting tube on the scale.

The utility model also proposes a drainage catheter which can be at least partially inserted into the body of a patient, characterized in that it has a tubular body on which a puncture part is provided, which is made of an elastic material and is formed by a thickened structure.

Advantageously, the piercing section is formed integrally with the tube, or the piercing section is formed as a separate piercing sleeve which is mounted on the tube.

Advantageously, the drainage catheter is provided with drainage openings on its body, which are formed in an oval shape.

Advantageously, the plurality of drainage apertures are arranged one after the other in the axial direction of the tube, and the size of the drainage apertures on the distal side of the tube is greater than the size of the drainage apertures on the proximal side of the tube.

Advantageously, the plurality of drainage apertures are arranged in an angular distribution of 180 ° or 120 ° or 90 ° in the circumferential direction of the tubular body.

Advantageously, the drainage catheter is provided with printed scale markings on opposite sides of its body.

Advantageously, the drainage catheter has an insertion head at the distal end of its catheter body, which insertion head is designed as a bullet-shaped or parabolic solid body part.

Advantageously, the drainage catheter has a protective cap on the proximal side of its body, which cap has an opening which is open towards the proximal side and a stopper which can seal off the opening.

Drawings

The utility model is explained in more detail below with reference to the drawings by means of embodiments, which are not, however, restricted to the embodiments described in the drawings and explained in detail below. The attached drawings are as follows:

FIG. 1 is a schematic view of an extracorporeal drainage system in accordance with one embodiment of the present invention;

FIG. 2 is a schematic view of the extracorporeal drainage system of FIG. 1 with the hanger and scale removed;

fig. 3a to 3c are a front view, a top view and a rear view, respectively, of the drainage catheter of the extracorporeal drainage system of fig. 1, wherein the drainage catheter of fig. 3c is partially sectioned;

FIG. 4 is an enlarged view of the drainage bottle of FIG. 2;

figure 5 is a schematic view of a lead of the present application.

Detailed Description

Illustrative embodiments of the extracorporeal drainage system 1 and drainage catheter 2 of the present invention are described below. In the description, various systems, structures and devices are schematically depicted in the drawings for purposes of explanation only and not all features of an actual system, structure or device, such as a well-known function or structure, are not described in detail to avoid obscuring the present invention in unnecessary detail. It will of course be appreciated that in the development of any such actual implementation, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such implementation decisions, while complex and time consuming, are nevertheless routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

The terms and phrases used herein should be understood and interpreted to have a meaning consistent with the understanding of those terms and phrases by those skilled in the relevant art. No special definition of a term or phrase, i.e., a definition that is different from the ordinary and customary meaning as understood by those skilled in the art, is intended to be implied by consistent usage of the term or phrase herein. To the extent that a term or phrase is intended to have a special meaning, i.e., a meaning other than that understood by skilled artisans, such a special definition will be expressly set forth in the specification in a definitional manner that directly and unequivocally provides the special definition for the term or phrase.

Throughout the following description, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be interpreted in an open, inclusive sense, i.e., as "including but not limited to".

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

An extracorporeal drainage system 1 and a drainage catheter 2 according to an embodiment of the present invention will be described in detail with reference to fig. 1 to 5.

Fig. 1 is a schematic view of an extracorporeal drainage system 1. The extracorporeal drainage system 1 may have a drainage catheter 2. The drainage catheter 2 may have a distal end that is further from the operator (doctor or nurse) when in use and a proximal end that is closer to the operator when in use. In use, the drainage catheter 2 can be placed at its distal end into a patient's body (e.g., intracranial) for a drainage procedure.

Referring to fig. 3a and 3c, the drainage catheter 2 can have a tube 3, which tube 3 can have a continuous central channel 4 over its longitudinal extension (see fig. 3 c). The tubular body 3 may be made of an elastic material, such as silicone. The drainage catheter 2 may be provided with drainage apertures 5 at its distal end on its body 3, said drainage apertures 5 allowing fluid communication of the central channel 4 of the drainage catheter 2 with the interior of the patient. Excess patient fluid or drainage fluid, such as cerebrospinal fluid or blood fluid, can flow into the drainage catheter 2 via the drainage opening 5, and therapeutic drug can be injected into the patient. The drainage holes 5 can be oval, and practice proves that the oval shape of the drainage holes 5 can have a good anti-blocking effect. A plurality of, for example, 2 to 4, drainage holes 5 may be arranged one after another in the axial direction of the tube body 3, and the size of these drainage holes 5 may gradually decrease from the distal side to the proximal side. A plurality of drainage holes 5 may also be arranged in the circumferential direction of the tube body 3, and the drainage holes 5 may be distributed at an angle of 180 ° or 120 ° or 90 ° in the circumferential direction. These arrangements of drainage apertures 5 can best serve an all-round drainage function without clogging. In the embodiment shown in fig. 3a to 3c, only two drainage apertures 5 are provided, which are opposed (i.e. spaced 180 ° apart circumferentially).

The drainage catheter 2 can be provided with, for example, identical printed scale markings 6 on opposite sides of its shaft 3, which facilitates the operator to read the placement depth of the drainage catheter 2 from different perspectives.

The drainage catheter 2 can have an insertion head 7 at the distal end of its tubular body 3, which insertion head 7 can be designed as a bullet or a parabolic solid body part. The bullet or parabolic shape facilitates placement of the drainage catheter 2 and reduces trauma to the tissue within the patient's body as compared to a hemispherical shape. The insertion tip 7 of the drainage catheter 2 can be a separate component which can be fixed to the body 3 of the drainage catheter 2 by adhesive bonding. The distal opening of the tubular body 3 is thereby closed by the insertion head 7. Insertion head 7 may be made of an elastic material, for example silicone.

The drainage catheter 2 can have a cap 8 at its proximal end, the body 38 of the cap 8 can have a larger diameter than the tube 3 and can be provided with an opening 9 which is open towards the proximal side. The cap 8 may be made separately from the tube 3 or integrally. An elongated tab 10 may be integrally formed on the main body 38 of the cap 8, and a protrusion may be integrally formed on the tab 10 as a plug 11, and the plug 11 may be sealingly closed in the opening 9 or may be pulled out from the opening 9. To this end, the size of the plug 11 may be larger than the size of the opening 9, so that the plug 11 may form an interference fit with the opening 9. The main body 38, the tab 10 and the plug 11 of the cap 8 may be made of the same elastic material as the tubular body 3. When placing the tube (i.e., placing the drainage catheter 2 into the patient), the drainage catheter 2 with the opening 9 blocked by the plug 11 can be placed into the patient first, and the plug 11 can prevent the patient drainage fluid from flowing out of the opening 9.

The drainage catheter 2 may be provided with a thickened structure which may form the puncture 12. The piercing part 12 may be made of an elastic material, such as silicone. The puncture 12 may be provided at a location of the drainage catheter 2 that is not placed into the patient's body during use, such as at a location that is substantially in the middle or more proximal of the drainage catheter 2. The piercing portion 12 may be formed separately from the tubular body 3 as a separate piercing sleeve (as in the present embodiment), and then the piercing sleeve is fitted over the tubular body 3 and attached thereto, for example, by interference fit or adhesively bonded with glue. It is of course also conceivable to make the piercing section 12 integrally with the tube 3. In use, during drainage, the needle (not shown) of the syringe can be passed through the piercing part 12 into the central passage 4 of the tube body 3 to inject therapeutic drugs into the body for treatment, or to inject anticoagulants to dissolve and break up the blood clots that form and are liable to cause clogging, thereby acting as a blockage preventing and channel-opening means after blockage. Of course, the drainage liquid may be aspirated through the puncturing part 12 for the assay. A significant advantage of the puncturing part 12 is that, for example, after the needle has been pulled out, the needle hole formed by the needle can be closed by the spring-back force of the elastic material of the puncturing part 12 itself. Thus, bacteria can no longer enter the central passage 4 of the tube body 3 through the needle hole and then enter the human body, thereby effectively preventing bacterial infection of the patient.

Referring to fig. 5, the extracorporeal drainage system 1 may have a lead 13, which lead 13 may be made of a stiff material, such as stainless steel, and is used to assist in the insertion of the softer drainage catheter 2 into the patient. The guide pin 13 can form a fine step-shaped tip 14 at the distal end thereof, so that the guide pin 13 can be more reliably jacked to the insertion head end 7 of the drainage catheter 2 during catheterization to prevent the guide pin 13 from slipping out of the lateral drainage hole 5 to hurt human tissues.

The extracorporeal drainage system 1 can have a pipe connection 15, which pipe connection 15 can be designed as a two-way, straight-through connection with a straight central channel, whereby the pipe connection 15 can connect the drainage line 2 to a connecting pipe 16, which will be described below. Due to the two-way through configuration of the tube connector 15, dead spaces which would occur in the presence of a three-way valve and a luer connector, which could lead to bacterial growth during long drainage periods and to infections, do not occur within the tube connector 15. The pipe joint 15 may be made of a hard elastic material. The coupling 15 can be inserted with its distal end in fluid communication with the proximal end of the drainage catheter 2, for example with an interference fit, into the proximal opening of the drainage catheter 2, while the stopper has been pulled out.

The extracorporeal drainage system 1 may have a connection tube 16, which connection tube 16 is in fluid communication with the proximal end of the tube connector 15 at its distal end. The connection of the connector 15 to the drainage line 2 and the connecting piece 16 can be wound with gauze in order to reinforce the connection and to prevent bacteria from entering the drainage line 2 and the connecting piece 16 through the connection. The connection pipe 16 may be made of an elastic material, and thus the connection pipe 16 may have a certain extensibility. This extensibility counteracts pulling caused by small body movements of the patient, thereby reducing or eliminating the risk of accidental withdrawal of the drainage catheter 2 placed within the patient. A flow stop clip 23 may be provided on the connecting tube 16, which flow stop clip 23 may clip or open the connecting tube 16 to block (e.g., when injecting medication or anticoagulant through the puncturing portion 12) or release the connecting tube 16.

The extracorporeal drainage system 1 may have a drainage bottle 17. Referring to fig. 4, the drainage bottle 17 may have a drainage cap 18, and the connecting tube 16 may be connected at its proximal end to the drainage cap 18, thereby introducing drainage fluid into the drainage bottle 17. The drainage bottle 17 can have three different volume designs of large, medium and small, which can be 40 plus or minus 10ml, 70 plus or minus 10ml and 100 plus or minus 10ml respectively. The drainage bottle cap 18 is provided with a vent hole which can balance the internal and external pressure difference of the drainage bottle 17. An air filtering membrane 19 is fixed on the inner side or the lower side of the air holes, and the air filtering membrane 19 can filter air entering the drainage bottle 17 from the external environment so as to prevent bacteria from entering the drainage bottle 17.

Referring to fig. 2, the drainage bottle 17 may be in fluid communication at its bottom with a drainage bag 20 via a plastic hose 19. The drainage bag 20 may have a volume of about 2000 ml. A normally closed flow stop clip 21 is provided on the plastic hose 19. When a certain amount, for example, 50ml (which can be read through the scale on the drainage bottle 17) of drainage liquid accumulates in the drainage bottle 17, the flow stop clip 21 can be opened to allow the drainage liquid in the drainage bottle 17 to flow into the drainage bag 20. From this the amount of drainage fluid drained over time can be calculated. Here, the drainage bottle 17 can be directly connected to the drainage bag 20 through the plastic hose 19, thereby eliminating the need for a three-way valve, a luer connector, a heparin cap, and the like, which are likely to cause dead space.

Referring to FIG. 4, the bottle 17 may have a withdrawal port 22 in its lower portion on the side, and the withdrawal port 22 may be formed by an integrally formed protruding tube 24 on the sidewall of the bottle 17. The protruding tube 24 is in fluid communication with the interior of the drainage bottle 17 at one end and is provided with an opening at the other end that opens away from the side wall of the drainage bottle 17. Plug 25 may be inserted into the opening and may block the opening. In order to prevent the plug 25 from accidentally falling out of the opening, a nut 26 with an internal thread can be provided, which nut 26 can be screwed onto the external thread of the protruding tube 24. The screw cap 26 may have a central opening at its top, which may be of a smaller size than the stopper, so as to be able to perform the function of fixing the stopper 25 on the one hand, and to insert the needle of the syringe into the protruding tube 24 through this opening to aspirate the drainage fluid for testing on the other hand. The stopper 25 can be made of an elastic material. A significant advantage of the elastic plug 25 is that after the needle has been withdrawn, the needle hole created by the needle is closed by the resilience of the elastic material of the plug 25 itself. Thus, bacteria can no longer enter the drainage bottle 17 through the needle hole. The drawing test function through the drawing port 22 is previously realized by a heparin cap on a three-way valve arranged between the drainage bottle 17 and the drainage bag 20, while the utility model realizes the function through the drawing port 22 on the drainage bottle 17, so that the connection between the drainage bottle 17 and the drainage bag 20 only needs to be directly (or only) through the plastic hose 19. This not only saves on component costs, but also avoids the presence of dead spaces.

The drainage bottle 17 may have an overflow port 27 in its upper portion on the side. The overflow 27 may be provided below the air filter membrane 19. The overflow 27 can be connected by an L-bend 28 to one end of a plastic hose 29, while the plastic hose 29 is connected at its other end to an overflow bag 30. The volume of the overflow bag 30 may be about 400 ml. The overflow port 27 is advantageous in that, when the nurse carelessly forgets to discharge the drainage liquid in the drainage bottle 17 into the drainage bag 20 in time, the drainage liquid can flow out into the overflow bag 30 through the overflow port 27 before reaching the air filtering membrane 19, so that the drainage liquid is prevented from contacting the air filtering membrane 19, thereby affecting the function of the air filtering membrane 19.

The extracorporeal drainage system 1 may have a scale 31. The scale 31 may have an elongated slit (not shown) in the center thereof. The scale 31 may have two scale marks with two scale units on two sides of the gap, which may be mmHg and cmH respectively₂And O. When in drainage, the zero scale marked by the scale can be flush with the part to be drained of the patient, such as the head (or the lumbar vertebra). The scale 31 may be attached to a pole (not shown) by a lanyard 32 at its top or a clip (not shown) at its rear. The scale 31 may also have a level 33 that can observe and adjust the levelness of the scale 31. Furthermore, a connecting tube holder 34 can be provided on the scale 31, which connecting tube holder 34 can hold the connecting tube 16 on the scale 31.

Referring to fig. 1, the extracorporeal drainage system 1 may have an elongated hanger 35. A hanger fixing bolt 36 may pass through the upper end of the hanger 35 into the slit of the scale 31. A hanger fixing washer may be provided between the hanger fixing bolt 36 and the scale 31. The hanger 35 can be fastened to the scale 31 by tightening the hanger fixing bolt 36. When the hanger fixing bolt 36 is loosened, the hanger 35 can be driven by the hanger fixing bolt 36 to slide up and down in the gap of the scale 31.

The drainage bottle 17 (e.g., with its drainage cap 18 and its lower portion) can be affixed, e.g., glued, to the hanger 35 so that when the hanger 35 slides on the scale 31, the drainage bottle 17 can also slide relative to the scale 31. Thus, during drainage, with the scale 31 fixed, the drainage pressure can be adjusted by adjusting the height of the drainage bottle 17 relative to the scale 31 to ensure that the intracranial pressure of the patient is normally required. Typically, the inner drip opening below the drain cap 18 can be placed about 15cm above the head. The hanger 35 may be provided with a scale indicating horizontal line 37, and the scale indicating horizontal line 37 has the same height as the drip openings in the drainage bottle 17, so that the scale indicating horizontal line 37 indicates the height of the drainage bottle 17 on the scale 31.

Thus, the main technical effects that can be achieved with the extracorporeal drainage system 1 and the drainage catheter 2 according to the utility model are, for example, that in the present invention, the drainage catheter 2 and the connecting tube 16 can be connected directly (or only) by a two-way through connection and the puncture 12 can be provided on the drainage catheter 2, and that in the drainage bottle 17 and the drainage bag 20 can be connected directly (or only) by a plastic hose 19 and the drainage port 22 can be provided on the drainage bottle 17, whereas the previous luer, three-way and heparin caps are dispensed with, whereby dead spaces caused by the structure of these components themselves are avoided, whereby the risk of bacterial growth and thus infection of the patient in the extracorporeal drainage system is greatly reduced or avoided, and the component costs are saved. In addition, the needle of the syringe can penetrate the puncture part 12 of the drainage catheter 2 to inject the medicine for treatment or anticoagulant into the human body, and after the needle is pulled out, the needle hole caused by the needle can be closed by the resilience of the elastic material of the puncture part so that bacteria can not pass through.

Finally, it is noted that the above-mentioned embodiments are only for understanding and explaining the present invention, and do not limit the scope of the present invention. It will be apparent to those skilled in the art that modifications may be made in the foregoing embodiments, all without departing from the scope of the utility model.

Claims (32)

1. An extracorporeal drainage system, comprising:

a drainage catheter capable of being at least partially placed within a patient;

the drainage bottle is used for temporarily storing the liquid in the body of the patient, which is drained from the drainage catheter;

a connecting tube that fluidly communicates the drainage catheter and the drainage bottle,

the joint is arranged between the drainage catheter and the connecting pipe, the joint is a two-way joint, a puncture part formed by a thickened structure is arranged on a pipe body of the drainage catheter, and the puncture part is made of elastic materials.

2. The extracorporeal drainage system of claim 1, wherein the extracorporeal drainage system has a drainage bag into which the fluid from the patient's body temporarily stored in the drainage bottle can be discharged, wherein the connection between the drainage bottle and the drainage bag is made directly by a plastic hose.

3. The extracorporeal drainage system of claim 1 or 2, wherein the puncture portion is integrally formed with the tube, or the puncture portion is formed as a separate puncture sleeve that is fitted over the tube.

4. The extracorporeal drainage system of claim 1 or claim 2, wherein the puncture is provided at a location of the tube that is not placed into the patient in use.

5. The extracorporeal drainage system of claim 1 or 2, wherein the drainage catheter is provided with drainage holes on its body, the drainage holes being elliptically shaped.

6. The external drainage system of claim 5, wherein the plurality of drainage apertures are arranged sequentially in an axial direction of the tube, and wherein the size of the drainage apertures on the distal side of the tube is greater than the size of the drainage apertures on the proximal side of the tube.

7. The extracorporeal drainage system of claim 5, wherein the plurality of drainage holes are arranged at an angular distribution of 180 ° or 120 ° or 90 ° around the circumference of the tubular body.

8. The extracorporeal drainage system of claim 1 or claim 2, wherein the drainage catheter is provided with printed scale markings on opposite sides of its body.

9. The extracorporeal drainage system of claim 1 or 2, wherein the drainage catheter has an insertion head distal to its catheter body, the insertion head being configured as a bullet-shaped or parabolic solid body part.

10. The extracorporeal drainage system of claim 1 or 2, wherein the drainage catheter has a cap on a proximal side of its body, the cap having an opening that opens toward the proximal side and a stopper that sealingly blocks the opening.

11. The extracorporeal drainage system of claim 1 or 2, wherein the extracorporeal drainage system has a guide pin forming a stepped tip with its distal end.

12. The extracorporeal drainage system of claim 1 or 2, wherein a gauze is wrapped around the junction of the tube connector with the drainage catheter and the connecting tube.

13. The extracorporeal drainage system of claim 1 or 2, wherein the connection tube is made of an elastic material and has extensibility.

14. The extracorporeal drainage system of claim 1 or claim 2, wherein a suction port is provided on the drainage bottle.

15. The extracorporeal drainage system of claim 14, wherein the drainage port is formed by a projecting tube integrally formed in the side wall of the drainage bottle, the projecting tube being in fluid communication with the interior of the drainage bottle at one end thereof and being provided with an opening at the other end thereof which opens away from the side wall of the drainage bottle.

16. The extracorporeal drainage system of claim 15, wherein a plug is provided which is inserted into the opening and sealingly closes the opening, the plug being made of an elastic material and being provided with a nut with an internal thread which is screwed with its internal thread onto the external thread of the protruding tube.

17. The extracorporeal drainage system of claim 16, wherein the nut has an opening at a top thereof, the opening having a size smaller than a cross-sectional size of the plug.

18. The extracorporeal drainage system of claim 1 or 2, wherein the drainage bottle has an overflow port on the side at its upper portion.

19. The extracorporeal drainage system of claim 18, wherein the drainage bottle is in fluid communication with an overflow bag via the overflow port.

20. The extracorporeal drainage system of claim 1 or 2, wherein the extracorporeal drainage system has a scale with a plurality of scale markings having different scale units.

21. The system of claim 20, wherein the system has a hanger to hold a bottle of drainage, the hanger being adjustable in relative position with respect to the scale.

22. The extracorporeal drainage system of claim 21, wherein the scale has an elongated slot, the hanger being movably guided or fixed relative to the scale via a hanger fixing bolt that protrudes into the slot.

23. The extracorporeal drainage system of claim 21, wherein a scale indicating cross-bar is provided on the hanger, the scale indicating cross-bar indicating a corresponding scale on the scale.

24. The extracorporeal drainage system of claim 20, wherein a connector holder is provided on the scale, the connector holder holding the connector on the scale.

25. A drainage catheter which can be at least partially placed in a patient's body, characterized in that it has a tubular body on which a puncturing part consisting of a thickened structure is provided, the puncturing part being made of an elastic material.

26. The drainage catheter of claim 25, wherein the puncturing portion is integrally formed with the tube body, or the puncturing portion is formed as a separate puncturing sleeve, and the puncturing sleeve is sleeved on the tube body.

27. The drainage catheter of claim 25 or 26, wherein the drainage catheter is provided with drainage holes in its body, said drainage holes being elliptically shaped.

28. The drainage catheter of claim 27, wherein the plurality of drainage apertures are arranged sequentially in an axial direction of the tube, and wherein the size of the drainage apertures on the distal side of the tube is greater than the size of the drainage apertures on the proximal side of the tube.

29. The drainage catheter of claim 27, wherein the plurality of drainage holes are arranged at an angle of 180 ° or 120 ° or 90 ° in the circumferential direction of the tubular body.

30. The drainage catheter of claim 25 or 26, wherein the drainage catheter is provided with printed scale markings on opposite sides of its body.

31. The drainage catheter of claim 25 or 26, wherein the drainage catheter has an insertion tip distal to its body, the insertion tip being configured as a bullet-shaped or parabolic solid body part.

32. The drainage catheter of claim 25 or 26, wherein the drainage catheter has a cap on a proximal side of its body, the cap having an opening open to the proximal side and a stopper capable of sealingly blocking the opening.

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