Anti-blocking double-cannula negative pressure flushing drainage tube

Abstract

The utility model belongs to the field of medical apparatus and instruments, concretely provides a kind of anti-clogging double cannula negative pressure flushing drainage tube, three-way joint is arranged on drainage tube, and the impurity cleaning between inner drainage tube and outer drainage tube interlayer can be realized by the outer tube cleaning port on three-way joint using unblocking device, simultaneously, the cleaning of the impurity that blocks in inner drainage tube can be realized by inner tube flushing pipe using unblocking device, and reverse membrane is fixedly arranged in the inside of outer drainage tube, and reverse membrane is fixed to inner drainage tube after installation The interlayer between inner drainage tube and outer drainage tube can be sealed while producing the fixed effect of inner drainage tube, and impurity is avoided to pass.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to an anti-clogging double-tube negative pressure flushing drainage tube. Background Technology

[0002] Drainage is a common procedure in the field of surgery. It can remove accumulated fluid and pus from the affected area to the outside of the body, prevent fluid accumulation in the body, and reduce the risk of infection and pressure on the tissues and organs near the affected area.

[0003] Drainage tubes are medical devices used in drainage procedures to drain fluid from the patient's affected area. Single-lumen drainage tubes, with only one drainage cavity, are often blocked by blood clots and other impurities during drainage, affecting the effectiveness of the procedure. Flushing the drainage tube with irrigation fluid can clear blockages to some extent, but this method is only effective for minor blockages. In practice, blockages that cannot be cleared by flushing often occur, requiring replacement of the drainage tube to continue drainage, which is cumbersome and increases the difficulty of the procedure. Double-tube drainage tubes prevent blockages by using an outer tube, but in cases of stubborn blockages, the inner tube must still be replaced to clear the blockage and continue drainage.

[0004] Therefore, there is an urgent need for a flushing and drainage tube that can easily clear blockages. Utility Model Content

[0005] To address the problem of easy blockage and difficulty in clearing blockages in existing drainage tubes, this invention provides a blockage-resistant double-tube negative pressure flushing drainage tube. A three-way connector is installed on the drainage tube. Through the cleaning port on the outer tube of the three-way connector, a blockage remover can be used to clean impurities between the inner and outer drainage tubes. At the same time, the blockage remover can be used to flush the inner tube to remove blockages and impurities inside the inner drainage tube.

[0006] This utility model provides a double-tube negative pressure flushing and drainage tube for preventing blockage, including an inner drainage tube and an outer drainage tube sleeved on the inner drainage tube. A sealing cap is fixedly installed axially on the inner drainage tube. An inner drainage hole is opened at the front end of the inner drainage tube. The tail end of the drainage tube is connected to one of the connectors of an adapter. The other two connectors of the adapter are respectively connected to a suction tube and an inner tube flushing tube. An inner tube flushing interface is provided at the end of the inner tube flushing tube. The sealing cap is detachably fixedly connected to a tee connector at the front end of the drainage tube. The front end of the tee connector is connected to the tail end of the outer drainage tube. An outer drainage hole is provided at the front end of the outer drainage tube. An outer tube flushing tube communicating with the inner cavity of the outer drainage tube is fixedly installed on the side wall of the outer drainage tube. An outer tube flushing connector is provided at the other end of the outer tube flushing tube. A blockage remover is detachably inserted into the inner drainage tube through the inner tube flushing tube. The front ends of the inner drainage tube are flush with or slightly behind the front ends of the outer drainage tube.

[0007] The diameter of the unblocking device must be smaller than the inner diameter of the inner drainage tube and smaller than the radial length of the interlayer between the inner and outer drainage tubes to ensure that the unblocking device can smoothly enter the interior of the inner drainage tube and the interlayer between the inner and outer drainage tubes.

[0008] Both the inner and outer drainage tubes have open ends.

[0009] The internal drainage tube can attract drainage fluid, while the external drainage tube provides support and isolation for the internal drainage tube and prevents damage to surrounding tissues.

[0010] The internal and external flushing tubes allow sterile water, medications, and other media to be introduced into the internal and external drainage tubes. This can be used to flush the affected area and prevent blood clots from forming on the inner walls of the internal and external drainage tubes, thus clearing blockages. The suction tube can apply negative pressure to the inside of the internal drainage tube for suction.

[0011] When the blockage inside the internal drainage tube cannot be flushed, a blockage clearer is placed into the flushing tube of the internal tube to assist in clearing the blockage and avoid flushing the tube. The blockage clearer can be a guide wire or a brush.

[0012] The external drainage tube is fixedly equipped with a check membrane. The check membrane is circular and has an opening in the middle. The diameter of the opening is less than the outer diameter of the internal drainage tube.

[0013] The check membrane is made of elastic material. After the external drainage tube and the internal drainage tube are assembled, the internal drainage tube passes through the opening of the check membrane. The check membrane fixes the internal drainage tube through its elasticity and seals the gap between the external drainage tube and the internal drainage tube, while preventing impurities from passing through during the drainage process.

[0014] An external drainage tube has an external tube cleaning port at the front end of the check membrane that communicates with the inside of the external drainage tube. A sealing cap is provided on the external tube cleaning port, and a through hole is provided on the sealing cap. The unblocking device is detachably inserted into the external tube cleaning port through the hole. The diameter of the through hole is less than the outer diameter of the unblocking device. When the unblocking device passes through the through hole, a seal is formed to prevent air flow.

[0015] A sealing cap is provided on the outer tube cleaning port, and the sealing cap has a protrusion that mates with the through hole. The diameter of the protrusion is larger than the diameter of the through hole.

[0016] Preferably, the sealing cap is detachably fixed to the tee connector in the front end direction, specifically by screwing or snap-fitting.

[0017] Preferably, a pressure relief port is fixedly provided on the three-way connector, and a filter membrane is fixedly provided on the pressure relief port. During the drainage process, the pressure relief port can prevent excessive drainage pressure. When negative pressure is applied to the internal drainage tube, the internal pressure is relieved. The filter membrane filters the air before introducing it into the drainage tube, preventing the negative pressure vacuum from causing excessive suction of surrounding tissue and resulting in wound damage.

[0018] Preferably, the tail end of the external drainage tube is provided with a hook, and the bottom of the tee connector is provided with a protrusion that cooperates with the hook. The tee connector and the external drainage tube are fixed by the cooperation of the hook and the protrusion to prevent the internal drainage tube from falling off.

[0019] Preferably, the other end of the suction tube relative to the adapter is a first threaded connector, which is connected to a negative pressure connector, and the other end of the negative pressure connector is connected to a negative pressure source.

[0020] Preferably, one end of the negative pressure connector is an external insertion interface with an internal circular pipe, and the other end is an internal insertion interface with an internal tapered pipe. Both ends are provided with threaded grooves. The first threaded connector of the suction tube is connected to one end of the negative pressure connector, and the negative pressure source is connected to the other end of the negative pressure connector through the negative pressure source connector. The negative pressure source connector can be any one of a tapered connector, a second threaded connector, or a normal pipe.

[0021] When the negative pressure source connector is a tapered connector, the tapered connector and the inner connector are interference fit; When the negative pressure source connector is a second threaded connector, the second threaded connector is threadedly connected to the threaded groove at one end of the negative pressure connector's external plug connector; When the negative pressure source connector is a normal pipeline, the negative pressure source connector is connected to the external plug of the negative pressure connector.

[0022] The negative pressure connector can be adapted to different negative pressure source connectors.

[0023] Preferably, the suction tube is provided with an adjusting clamp, and the front end of the external drainage tube is smoothly transitioned to form a rounded guide head. The adjusting clamp can be an injection regulating valve, a Robert clamp, etc., which can control the opening size of the suction tube and block the pipeline in the closed state. During tube placement, the rounded guide head can avoid unnecessary tissue damage.

[0024] The drainage tube can be made of common medical materials such as silicone, latex, PVC, and TPU. Graduation lines can be printed on the tube body, and the drainage tube has a common round cross-section.

[0025] When using, install the tee connector on the sealing cap, then install the external drainage tube on the tee connector, fix the tail end of the internal drainage tube on the adapter, connect the other two connectors of the adapter to the suction tube and the internal flushing tube, connect the first threaded connector of the suction tube to the negative pressure connector, connect the negative pressure source connector of the negative pressure source to the other end of the negative pressure connector, and turn on the negative pressure source to drain.

[0026] If a blockage occurs during the drainage process, media can be injected into the outer and inner flushing pipes for flushing. If flushing cannot overcome the blockage, a blockage clearer can be used to assist in clearing the blockage through the inner flushing port or the outer cleaning port.

[0027] The following beneficial effects are achieved by using the anti-clogging double-tube negative pressure flushing drainage tube of this utility model: 1) A check membrane is fixedly installed inside the external drainage tube. After installation, the check membrane fixes the internal drainage tube and seals the interlayer between the internal and external drainage tubes to prevent impurities from passing through. An external tube cleaning port communicating with the inside of the external drainage tube is set at the front end of the check membrane. A sealing cap with a through hole is set on the external tube cleaning port. By inserting the unblocking device into the through hole, the interlayer between the internal and external drainage tubes can be cleaned. By inserting the unblocking device into the internal tube flushing tube, the inside of the internal drainage tube can be cleaned to avoid blockage. 2) The end of the suction tube is a first threaded connector. The first threaded connector is connected to the negative pressure source through a negative pressure connector, which can be adapted to different types of negative pressure source connectors. 3) A pressure relief port is set on the tee connector, and a filter membrane is installed on the pressure relief port. During the drainage process, the pressure relief port can avoid excessive drainage pressure. When negative pressure is applied to the internal drainage tube, the internal pressure is relieved. The filter membrane filters the air before introducing it into the drainage tube, preventing the negative pressure vacuum from causing excessive suction of surrounding tissue and resulting in wound damage. Attached Figure Description

[0028] Figure 1 A schematic diagram of a double-tube negative pressure flushing drainage tube to prevent blockage; Figure 2 This is a schematic diagram of a double-tube negative pressure flushing drainage tube to prevent blockage during the cleaning process of the internal drainage tube; Figure 3 for Figure 2 Enlarged view of part A in the image; Figure 4 This is a schematic diagram of the internal drainage tube. Figure 5 This is a schematic diagram of a double-tube negative pressure flushing drainage tube used to prevent blockage during the cleaning of the inner and outer drainage tube interlayer. Figure 6 This is a schematic diagram of a hook attached to an external drainage tube. Figure 7 This is a schematic diagram of the protrusion on the tee connector that mates with the hook. Figure 8 This is a schematic diagram of a negative pressure interface; Figure 9 This is a schematic diagram showing the connection between the negative pressure interface and the tapered connector. Figure 10 This is a schematic diagram showing the connection between the negative pressure interface and the second threaded connector. Figure 11 This is a schematic diagram showing the connection between a negative pressure interface and a regular pipeline.

[0029] Wherein: 1 is the external drainage tube; 101 is the external drainage hole; 102 is the external tube cleaning port; 1021 is the sealing cap; 1022 is the through hole; 103 is the guide head; 104 is the anti-reverse membrane; 105 is the hook; 2 is the external tube flushing tube; 201 is the external tube flushing connector; 3 is the tee connector; 301 is the filter membrane; 4 is the sealing cap; 5 is the internal drainage tube; 501 is the internal drainage hole; 6 is the adapter; 7 is the suction tube; 701 is the adjusting tube clamp; 702 is the first threaded connector; 703 is the negative pressure connector; 7031 is the external insertion interface; 7032 is the internal insertion interface; 8 is the internal tube flushing tube; 801 is the internal tube flushing interface; 802 is the unblocking device; 9 is the negative pressure source; 901 is the tapered connector; 902 is the second threaded connector. Detailed Implementation

[0030] The technical solution of this utility model will be further described below with reference to specific embodiments. These embodiments are only used to illustrate the technical solution of this utility model in more detail and should not be construed as limiting the scope of protection of this utility model.

[0031] like Figures 1 to 4As shown, this utility model provides an anti-clogging double-tube negative pressure flushing drainage tube, including an inner drainage tube 5 and an outer drainage tube 1 sleeved on the inner drainage tube 5. A sealing cap 4 is axially fixed to the inner drainage tube 5. An inner drainage hole 501 is opened at the front end of the inner drainage tube 5. The tail end of the inner drainage tube 5 is connected to one connector of an adapter 6. The other two connectors of the adapter 6 are respectively connected to a suction tube 7 and an inner tube flushing tube 8. An inner tube flushing interface 801 is provided at the end of the inner tube flushing tube 8. The sealing cap 4 is located at the drainage... The front end of the tube is detachably fixed to the tee connector 3. The front end of the tee connector 3 is connected to the tail end of the external drainage tube 1. The front end of the external drainage tube 1 is provided with an external drainage hole 101. An external flushing tube 2 communicating with the inner cavity of the external drainage tube 1 is fixedly provided on the side wall of the external drainage tube 1. An external flushing connector 201 is provided at the other end of the external flushing tube 2. The unblocking device 802 is detachably inserted into the inner drainage tube 5 through the inner flushing tube 8. The inner drainage tube 5 is flush with or slightly behind the front end of the external drainage tube 1.

[0032] Both the inner drainage tube 5 and the outer drainage tube 1 have open ends. The inner drainage tube 5 can attract drainage fluid, while the outer drainage tube 1 provides support and isolation for the inner drainage tube 5 and prevents damage to surrounding tissues.

[0033] Sterile water, medications, and other media can be introduced into the internal drainage tube 5 and external drainage tube 1 through the inner flushing tube 8 and the outer flushing tube 2. This can be used to flush the affected area and prevent blood clots from forming on the inner walls of the internal drainage tube 5 and external drainage tube 1, thus clearing blockages. Negative pressure can be applied to the inside of the internal drainage tube 5 through the suction tube 7 for negative pressure suction.

[0034] When the blockage inside the inner drainage tube 5 cannot be flushed, the unblocking device 802 is placed into the inner tube flushing tube 8 to assist in unblocking and avoid flushing the tube. The unblocking device 802 can be a guide wire or a brush.

[0035] The diameter of the unblocking device 802 must be smaller than the inner diameter of the inner drainage tube 5 and smaller than the radial length of the interlayer between the inner drainage tube 5 and the outer drainage tube 1, so as to ensure that the unblocking device 802 can smoothly enter the interior of the inner drainage tube 5 and the interlayer between the inner and outer drainage tubes.

[0036] A check membrane 104 is fixedly installed inside the external drainage tube 1. The check membrane 104 is circular and has an opening in the middle. The diameter of the opening is less than the outer diameter of the internal drainage tube 5. The check membrane 104 is inclined towards the front end of the flushing drainage tube. When the negative pressure source is turned on to suction, the check membrane 104 opens along the gas flow direction (i.e., the front end of the flushing drainage tube) to allow air to enter. The liquid from the front end between the internal drainage tube 5 and the external drainage tube 1 can cause the check membrane 104 to move along the liquid flow direction (i.e., the rear end of the flushing drainage tube) to form a closed seal.

[0037] The check membrane 104 is made of elastic material. When the external drainage tube 1 and the internal drainage tube 5 are assembled, the internal drainage tube 5 passes through the opening of the check membrane 104. The check membrane 104 fixes the internal drainage tube 5 through its elasticity and seals the interlayer between the external drainage tube 1 and the internal drainage tube 5, while preventing impurities from passing through during the drainage process.

[0038] like Figure 5 As shown, the external drainage tube 1 has an external tube cleaning port 102 connected to the inside of the external drainage tube 1 at the front end of the check membrane 104. The external tube cleaning port 102 is provided with a sealing cap 1021 and a through hole 1022. The unblocking device 802 is detachably inserted into the external tube cleaning port 102 through the through hole 1022. The diameter of the through hole 1022 is less than the outer diameter of the unblocking device 802. When the unblocking device 802 passes through the through hole 1022, a seal is formed to prevent air flow.

[0039] The sealing cap 1021 is made of elastic material. When the unblocking device 802 passes through the through hole 1022 of the sealing cap 1021, the sealing cap 1021 and the unblocking device 802 are press-fitted through the through hole 1022 to form a seal, thereby preventing the unblocking device 802 from interfering with the negative pressure inside.

[0040] A sealing cap 4 is provided on the outer tube cleaning port 102. The sealing cap 4 has a protrusion that cooperates with the through hole 1022. The diameter of the protrusion is larger than the diameter of the through hole 1022. By inserting the protrusion on the sealing cap 4 into the through hole 1022, the outer tube cleaning port 102 can be sealed when cleaning is not performed.

[0041] The sealing cap 4 is detachably fixed to the tee connector 3 in the front end direction, specifically by screwing or snapping.

[0042] As a further preferred option, the sealing cap 4 is screwed to the tee connector 3, which is more secure and tighter than the threaded fixation of the sealing cap 4 and the direct assembly with the inner drainage tube 5.

[0043] A pressure relief port is fixedly installed on the three-way connector 3, and a filter membrane 301 is fixedly installed on the pressure relief port. During the drainage process, the pressure relief port can prevent excessive drainage pressure. When negative pressure is applied to the internal drainage tube 5, the internal pressure is relieved. The filter membrane 301 filters the air before introducing it into the drainage tube, preventing the surrounding tissue from being excessively attracted due to the negative pressure vacuum, which would cause wound damage.

[0044] like Figure 6 and Figure 7 As shown, the tail end of the external drainage tube 1 is provided with a hook 105, and the bottom of the three-way connector 3 is provided with a protrusion that cooperates with the hook 105. The three-way connector 3 and the external drainage tube 1 are fixed by the cooperation of the hook 105 and the protrusion to prevent the internal drainage tube 5 from falling off.

[0045] The other end of the suction tube 7 relative to the adapter 6 is a first threaded connector 702, which is connected to a negative pressure connector 703. The other end of the negative pressure connector 703 is connected to a negative pressure source 9.

[0046] like Figures 8 to 11 As shown, one end of the negative pressure connector 703 is an external insertion interface 7031 with an internal circular pipe, and the other end is an internal insertion interface 7032 with an internal tapered pipe. Both ends are provided with threaded grooves, which can lock the threaded connector. The first threaded connector 702 of the suction tube 7 is connected to one end of the negative pressure connector 703, and the negative pressure source 9 is connected to the other end of the negative pressure connector 703 through a negative pressure source connector. The negative pressure source connector can be any one of the tapered connector 901, the second threaded connector 902, or a normal pipe.

[0047] When the negative pressure source connector is a tapered connector 901, the tapered connector 901 and the inner connector 7032 are interference fit; When the negative pressure source connector is the second threaded connector 902, the second threaded connector 902 is threadedly connected to the threaded groove at one end of the external plug connector 7031 on the negative pressure connector 703.

[0048] When the negative pressure source connector is a normal pipeline, the negative pressure source connector is connected to the external connector 7031 on the negative pressure connector 703.

[0049] The negative pressure connector 703 can be adapted to different negative pressure source connectors.

[0050] An adjusting clamp 701 is provided on the suction tube 7. The front end of the external drainage tube 1 is smoothly transitioned to form a rounded guide head 103. The adjusting clamp 701 can be an injection regulating valve, a Robert clamp, etc., which can control the opening size of the suction tube 7. In the closed state, the tube is blocked. During tube placement, the rounded guide head 103 can avoid unnecessary tissue damage.

[0051] The drainage tube can be made of common medical materials such as silicone, latex, PVC, and TPU. Graduation lines can be printed on the tube body, and the drainage tube has a common round cross-section.

[0052] In use, install the three-way connector 3 on the sealing cover 4, then install the external drainage tube 1 on the three-way connector 3, fix the tail end of the internal drainage tube 5 on the adapter 6, connect the other two connectors of the adapter 6 to the suction tube 7 and the internal flushing tube 8, connect the first threaded connector 702 of the suction tube 7 to the negative pressure connector 703, connect the negative pressure source connector of the negative pressure source 9 to the other end of the negative pressure connector 703, and turn on the negative pressure source 9 to drain.

[0053] If a blockage occurs during the drainage process, the medium can be injected into the outer flushing pipe 2 and the inner flushing pipe 8 for flushing. If flushing cannot overcome the blockage, the blockage clearer 802 can be used to assist in clearing the blockage through the inner flushing port 801 or the outer cleaning port 102.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any equivalent substitutions or modifications made by those skilled in the art within the spirit and principle of the present utility model without any creative effort shall be included within the protection scope of the present utility model.

Claims

1. A double-tube negative pressure flushing drainage tube for preventing blockage, comprising an inner drainage tube (5) and an outer drainage tube (1) sleeved on the inner drainage tube (5), wherein the inner drainage tube (5) has an inner drainage hole (501) at its front end, and the outer drainage tube (1) has an outer drainage hole (101) at its front end, characterized in that: A sealing cap (4) is fixedly installed axially on the inner drainage tube (5). The tail end of the drainage tube is connected to one of the connectors of the adapter (6). The other two connectors of the adapter (6) are connected to the suction tube (7) and the inner tube flushing tube (8) respectively. An inner tube flushing interface (801) is provided at the end of the inner tube flushing tube (8). The sealing cap (4) is detachably fixedly connected to the tee connector (3) at the front end of the drainage tube. The front end of the tee connector (3) is... The end is connected to the tail end of the external drainage tube (1). An external tube flushing tube (2) communicating with the inner cavity of the external drainage tube (1) is fixedly installed on the side wall of the external drainage tube (1). An external tube flushing connector (201) is provided at the other end of the external tube flushing tube (2). The unblocking device (802) is detachably inserted into the internal drainage tube (5) through the internal tube flushing tube (8). The internal drainage tube (5) is flush with or slightly behind the front end of the external drainage tube (1). The diameter of the unblocking device (802) is smaller than the inner diameter of the inner drainage tube (5) and smaller than the radial length of the interlayer between the inner drainage tube (5) and the outer drainage tube (1); The external drainage tube (1) is fixedly provided with a check membrane (104). The check membrane (104) is circular and has an opening in the middle. The diameter of the opening is less than the outer diameter of the internal drainage tube (5). An external drainage tube (1) has an external tube cleaning port (102) at the front end of the check membrane (104). A sealing cap (1021) is provided on the external tube cleaning port (102). A through hole (1022) is provided on the sealing cap (1021). The unblocking device (802) is detachably inserted into the external tube cleaning port (102) through the hole (1022). The diameter of the through hole (1022) is less than the outer diameter of the unblocking device (802). A sealing cap (1021) is provided on the external tube cleaning port (102).

2. The anti-clogging double-tube negative pressure flushing drainage tube according to claim 1, characterized in that, The sealing cap (4) is screwed or snapped to the three-way connector (3) at the front end. A pressure relief port is fixedly provided on the three-way connector (3), and a filter membrane (301) is fixedly provided on the pressure relief port.

3. The anti-clogging double-tube negative pressure flushing drainage tube according to claim 1, characterized in that, The tail end of the external drainage tube (1) is provided with a hook (105), and the bottom of the three-way connector (3) is provided with a protrusion that cooperates with the hook (105). The three-way connector (3) and the external drainage tube (1) are fixed by the cooperation of the hook (105) and the protrusion.

4. The anti-clogging double-tube negative pressure flushing drainage tube according to claim 1, characterized in that, The other end of the suction tube (7) relative to the adapter (6) is a first threaded connector (702), which is connected to a negative pressure connector (703), and the other end of the negative pressure connector (703) is connected to a negative pressure source (9).

5. The anti-clogging double-tube negative pressure flushing drainage tube according to claim 4, characterized in that, One end of the negative pressure connector (703) is an external insertion interface (7031) with an internal circular pipe, and the other end is an internal insertion interface (7032) with an internal tapered pipe. Both ends are provided with threaded grooves. The first threaded connector (702) of the suction pipe (7) is connected to one end of the negative pressure connector (703). The negative pressure source (9) is connected to the other end of the negative pressure connector (703) through the negative pressure source connector. The negative pressure source connector can be any one of the tapered connector (901), the second threaded connector (902), or a normal pipe.

6. The anti-clogging double-tube negative pressure flushing drainage tube according to claim 5, characterized in that, When the negative pressure source connector of the negative pressure source (9) is a tapered connector (901), the tapered connector (901) is interference-fitted with the inner insertion interface (7032).

7. The anti-clogging double-tube negative pressure flushing drainage tube according to claim 5, characterized in that, When the negative pressure source connector of the negative pressure source (9) is a second threaded connector (902), the negative pressure source connector is threadedly connected to the threaded groove at one end of the external insertion interface (7031) on the negative pressure connector (703).

8. The anti-clogging double-tube negative pressure flushing drainage tube according to claim 5, characterized in that, When the negative pressure source connector of the negative pressure source (9) is a normal pipeline, the negative pressure source connector is connected to the external insertion interface (7031) of the negative pressure connector (703).

9. The anti-clogging double-tube negative pressure flushing drainage tube according to any one of claims 1-8, characterized in that, An adjusting clamp (701) is provided on the suction tube (7), and the front end of the external drainage tube (1) is smoothly transitioned to form a rounded guide head (103).

Images