CN107336271B

CN107336271B - Drainage tube intercepting device and method

Info

Publication number: CN107336271B
Application number: CN201710137263.0A
Authority: CN
Inventors: 郑忠伟; 龚彪; 袁庆; 王攀; 严航
Original assignee: Shanghai Innova Medical Instrument Co ltd
Current assignee: Shanghai Innova Medical Instrument Co ltd
Priority date: 2017-03-09
Filing date: 2017-03-09
Publication date: 2023-06-23
Anticipated expiration: 2037-03-09
Also published as: CN107336271A

Abstract

The utility model provides a drainage tube intercepting device and a drainage tube intercepting method, comprising a substrate, a cutting knife and a fastening and releasing device; the fastening release device is connected to the substrate and can fix and release the drainage tube relative to the substrate; the cutting knife is used for cutting the drainage tube; the substrate is provided with a groove along the longitudinal direction; the head part is provided with a through hole along the longitudinal direction of the substrate, and the through hole is communicated with the groove and used for penetrating the drainage tube to place the drainage tube in the groove; graduations are distributed on the side of the base opposite to the head along the longitudinal direction of the groove and are used for determining the length of the drainage tube. By the drainage tube intercepting device provided by the utility model, a user can cut the drainage tube with the corresponding length according to the required length. Therefore, the hospital only needs to store a certain length of drainage tube which is long enough, and when the drainage tube is used, the drainage tube with the required length is cut off, and various types of drainage tubes do not need to be stored in a large quantity.

Description

Drainage tube intercepting device and method

Technical Field

The utility model relates to the technical field of medical instruments, in particular to a drainage tube intercepting device.

Background

The biliary tract drainage tube, also called as biliary tract drainage tube, is matched with an endoscope for use, and is inserted into an indwelling drainage tube for temporary biliary drainage. The bile duct drainage tube is placed in the bile duct through the duodenal papilla under the endoscope, establishes a bile drainage way, is mainly used for bile drainage after an endoscopic biliary calculus operation and an endoscopic cholecystectomy operation, is a simple and effective method for relieving obstruction, and is mainly used for treating diseases requiring bile duct drainage such as postoperative yellowing of benign and malignant bile duct obstruction, suppurative cholangitis and the like. With the development of therapeutic ERCP (endoscopic retrograde cholangiopancreatography), endoscopic cholangiopancreatography has been accepted by most clinicians as the first choice of cholangiopancreatography because of its advantages of micro-traumatism, fewer complications, repeatability, etc., and is becoming more widely used in clinic.

In the prior art, the length of the drainage tube is basically fixed, and an operator selects the drainage tube with a proper length according to experience or an endoscope observation result, so that a large number of drainage tubes with different lengths and different types are required to be prepared in hospitals, a large storage area is occupied, and in addition, a large number of products are not used for a long time, and the cost is increased due to the fact that the products are out of date and scrapped. In general, the lengths of two adjacent models are different, and the needs of patients can not be met completely; sometimes the drainage tube is placed in different depths, the quantity of drainage holes needed is different, the hole is often needed to be made manually again, the time is wasted, the size, shape and position of the hole are often not ideal, the drainage effect is affected, and the risk of postoperative complications is increased. Accordingly, there is a great need in the art for a device and method that can adjust the length of a drain tube as needed for the situation.

To solve this problem, a medical instrument for postoperative drainage is disclosed in reference 1 (CN 201832266U). The medical instrument is a hollow round strip plastic tube with scales, and ten potential standby elliptical holes which are not completely cut completely are densely arranged at one end of the round head. The device can conveniently open the small holes with the required number according to the actual needs, is practical, simple and easy to implement, and reduces the workload and the risk of postoperative complications. In the utility model, a series of spare elliptical holes which are not completely cut are arranged, and then the needed holes are drilled according to the needs when the drainage tube is used, but the length of the drainage tube is not regulated, and the risk of falling off exists when part of the non-drilled holes are used.

Reference 2 (CN 205145347U) also mentions that the drainage tube in the prior art is too long, and the patient has caused problems of squeezing out of the tube in the activity or rest room, which discloses a interceptor of the drainage tube, comprising: a lower housing; an upper housing detachably connected to the lower housing; a rotatable spindle located in the center of the lower housing; a drain tube intercepting handle connected with the mandrel and extending from the upper shell; the drainage tube comprises a drainage tube fixing section and a drainage tube winding and stretching section, wherein the drainage tube fixing section is fixed on the lower shell, and the drainage tube winding and stretching section is coiled on the mandrel. According to the drainage tube collecting device, the drainage tubes are collected and fixed, and the length of the collected drainage tubes can be adjusted, so that the drainage tubes are placed in order, and the influence of mutual extrusion on smooth drainage is avoided. However, the utility model is only reasonable storage of the external drainage tube, and does not relate to actual drainage tube interception.

Therefore, providing a drainage tube intercepting device and method is a technical problem to be solved urgently in the medical field.

Disclosure of Invention

The utility model aims to provide a device and a method capable of adjusting the length of a drainage tube at any time according to requirements.

In order to solve the technical problems, the utility model provides a drainage tube cutting device,

comprises a substrate, a cutting knife and a fastening release device;

a fastening release device connected to the base for fixing and releasing the drainage tube relative to the base;

the cutting knife is used for cutting the drainage tube;

the substrate is provided with a groove along the longitudinal direction;

one end of the substrate along the longitudinal direction is provided with a head part for inserting a cutting knife, the head part is provided with a through hole along the longitudinal direction of the substrate, the through hole is communicated with the groove, and the drainage tube can pass through the through hole and be placed in the groove;

scales are distributed on the substrate along the longitudinal direction of the groove and used for determining the length from one end of the drainage tube entering the groove to the cut part of the drainage tube.

Further, the head portion may have a different structure, for example, the head portion includes a protrusion portion in which a cutting slit for inserting the cutter is formed, the cutting slit having a depth greater than that of the through hole.

Further, the cutting blade is fixed on the chute, the blade of the cutting blade is aligned with the cutting slit, and the drainage tube placed in the through hole can be cut off by sliding the cutting blade along the chute.

The head can also have the following structure, the front end of the head is provided with a plane which is flatly attached to the cutter surface of the cutter, the cutter is hinged on the head, the cutter surface is attached to the plane through the rotary cutter, and the drainage tube placed in the through hole can be cut off.

Further, the fastening and releasing device comprises a pressing block, and the pressing block is used for pressing the drainage tube.

Further, one end of the pressing block is hinged with the substrate, the other end of the pressing block is connected with the substrate in a buckling mode, the drainage tube can be fixed on the substrate through the buckling buckle, and the drainage tube can be released from the substrate through the unlocking buckle.

Further, a bolt is arranged on the pressing block in a penetrating mode, a threaded hole is formed in the corresponding position of the substrate, the drainage tube can be fixed on the substrate when the bolt is screwed down, and the drainage tube can be released from the substrate when the bolt is unscrewed up.

Further, a bevel groove is formed at a position of the base adjacent to the head, the bevel groove has a bevel with a height which is higher as the bevel groove is farther away from the head, and barbs can be formed on the drainage tube by a slitting knife along the bevel.

Further, the dissecting knife is fixed on the guide rail, slides along the guide rail and can dissect holes on the drainage tube.

Further, the utility model also provides a drainage tube intercepting method, which comprises the following steps of:

loosening the fastening release device;

inserting the drainage tube along the through hole and placing the drainage tube into the groove;

one end of the drainage tube is moved to the corresponding scale according to the length of the drainage tube;

compressing the drainage tube by a fastening and releasing device;

the drainage tube is cut off by a cutter.

Further, the drainage tube is cut off by the cutting knife through inserting the cutting slit into the cutting knife, or the drainage tube is cut off by rotating the cutting knife to make the knife surface of the cutting knife be attached to the plane of the front end of the protruding part.

Further, the method also comprises the following steps: and cutting the barbs on the surface of the drainage tube along the inclined plane groove by using a cutting knife.

In summary, by the drainage tube intercepting device and the drainage tube intercepting method provided by the utility model, a user can intercept the drainage tube with the corresponding length according to the required length. Therefore, the hospital only needs to store a certain drainage tube with enough length, and when the drainage tube is used, the drainage tube with the required length is cut off, so that various types of drainage tubes do not need to be reserved in a large quantity, and the requirements of treatment on the lengths of various drainage tubes can be fully met.

Drawings

The utility model is described in further detail below with reference to the attached drawings and detailed description:

FIG. 1 is a schematic view of a drainage tube intercepting device according to one embodiment of the present utility model;

FIG. 2 is a top view of the drain tube cutting apparatus of the embodiment shown in FIG. 1;

FIG. 3 is a schematic view of a drainage tube intercepting device according to another embodiment of the present utility model;

FIG. 4 is a front view of the drain tube cutting device of the embodiment shown in FIG. 3;

FIG. 5 is a top view of the drain tube cutting apparatus of the embodiment shown in FIG. 3;

FIG. 6 shows drainage according to yet another embodiment of the present utility model

A structural schematic diagram of the pipe cutting device;

FIG. 7 is a cross-sectional view taken along line A-A of FIG. 2 of a specific embodiment of the present utility model employing a first fastening device;

FIG. 8 is a cross-sectional view along A-A of a particular embodiment of the present utility model employing a second fastening device;

fig. 9 is a cross-sectional view along A-A of a third embodiment of the present utility model employing a third fastening device.

The element numbers are as follows:

1-substrate

2-groove

3-head

4-Scale

5-fastening release device

51-bolt

52-briquetting

53-indent

6-inclined plane groove

7-through hole

8-cutter

82-hole cutter

9-floor

91-chute

92-guide rail

Detailed Description

Preferred embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. While the description of the utility model will be presented in connection with various embodiments, it is not intended to limit the inventive features to only those embodiments. Rather, the purpose of the utility model described in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the utility model. The following description contains many specific details for the purpose of providing a thorough understanding of the present utility model. The utility model may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the utility model.

The terms "upper", "lower", "left", "right", "top" and "bottom" used in the following description are set forth to better describe the preferred embodiments of the present utility model, and should not be construed as limiting the present utility model.

The longitudinal direction of the substrate is the length direction of the substrate, namely the axial direction of the drainage tube, and the transverse direction is the width direction of the substrate 1.

Example 1

As shown in fig. 1-2, the present utility model provides a drain tube cutting device comprising a base 1, a cutting blade 8 (in the embodiment shown in fig. 1-2, the cutting blade is an additional blade and is not shown in the figures), and a fastening release device 5;

the fastening and releasing device 5 is connected to the substrate 1, and can fix and release the drainage tube relative to the substrate 1, so as to prevent the drainage tube from moving in the process of intercepting or cutting barbs;

the cutting knife 8 is used for cutting the drainage tube;

the substrate 1 is provided with grooves 2 in the longitudinal direction;

the one end of basement 1 along longitudinal direction has the head 3 that is used for inserting cutting knife 8, head 3 is equipped with through-hole 7 along basement 1 longitudinal direction, through-hole 7 is linked together with recess 2, the drainage tube can pass through-hole 7 and place in recess 2, the existence through-hole 2 and through-hole 7 can restrict the drainage tube and offset along basement 1 longitudinal direction, avoid measuring length to produce the error, and restrict the drainage tube from two positions through-hole 7 and fastening release 5, can effectually avoid the drainage tube perk or deviate from recess 2 longitudinal direction, influence cutting device measurement accuracy.

On the opposite side of the base 1 from the head 3, graduations 4 are distributed in the longitudinal direction of the groove 2, the graduations 4 comprise graduation marks and numerical values for determining the length of the drainage tube relative to the cut part thereof, and the numerical value of the graduation 4 is the vertical length from the position where the drainage tube is cut to the graduation marks along the direction of the groove 2.

Further, the head 3 may have a different structure, for example, as shown in fig. 1, the head 3 includes a protrusion portion in which a cutting slit for inserting the cutting blade 8 is formed, the cutting slit having a depth greater than that of the through hole 7, so that the accuracy of the position where the drainage tube is cut can be ensured by cutting the blade through the cutting slit.

Further, the cutter may be a separate blade, and the drainage tube cutting device of the structure shown in fig. 1 may be configured such that an operator may insert the blade along the cutting slit to cut off the drainage tube placed in the through hole 7.

Further, as shown in fig. 3 to 5, the drainage tube cutting device further comprises a bottom plate 9, the base 1 is fixed on the bottom plate 9, a sliding groove 91 is further arranged on the bottom plate 9, the cutting knife 8 is connected to the sliding groove 91, and can slide on the sliding groove 91 along the direction of H1-H2, and the cutting edge of the cutting knife 8 is aligned with the cutting gap. Through the sliding of the cutting knife in the direction H1 on the sliding chute 91, the through hole 7 can be exposed for the drainage tube to be inserted, and then the cutting knife 8 is slid in the direction H2, so that the cutting knife 8 is inserted into the cutting gap, and the drainage tube placed in the through hole 7 can be cut off.

Further, in addition to the structure shown in fig. 3 to 5, the sliding groove 91 may be perpendicular to the bottom plate 9, so that the cutter 8 may slide up and down, and when the cutter 8 is lifted up, the through hole 7 is exposed for the drainage tube to be inserted, and then the drainage tube placed in the through hole 7 may be cut off by pressing down the cutter 8.

Further, the head 3 may have a structure in which, as shown in fig. 6, the front end of the head 3 forms a plane that is flush with the blade surface of the cutter 8, the cutter 8 is hinged to the head 3, and the cutter 8 is rotated to make the blade surface flush with the plane, so that the drainage tube placed in the through hole 7 can be cut off. Through the rotary cutter 8, the through hole 7 is exposed when the cutter 8 is lifted, the drainage tube can be inserted, and then the drainage tube rotates downwards, so that the cutter surface 8 is attached to a plane, and the drainage tube placed in the through hole 7 can be cut off.

The transverse and longitudinal positions of the cutting knife 8 can be fixed through the structure of the sliding groove 91 and the hinge structure, the accuracy of the cut position of the drainage tube can be ensured, and the operation of the cutting step is simplified.

Further, the fastening and releasing means 5 may be any means common in the art that can compress the drain tube, preventing the drain tube from moving during cutting.

Further, the fastening and releasing device 5 includes a pressing block 52, and the pressing block 52 is used for pressing the drainage tube.

The fastening release device 5 may be of the following specific structures:

for example, the pressing block 52 is provided with a bolt 51 in a penetrating manner, a threaded hole is formed in a corresponding position of the base 1, the drainage tube can be fixed on the base 1 when the bolt 51 is screwed down, and the drainage tube can be released from the base 1 when the bolt is unscrewed up.

Specifically, as for the first fastening device shown in fig. 7, fig. 7 is a sectional view of the embodiment shown in fig. 2 taken along the direction A-A in order to facilitate understanding of the specific structure of the fastening device. The pressing block 52 is independent of the substrate 1, the pressing block 52 is provided with a through hole, the diameter of the through hole is larger than the diameter of a thread of the bolt 51 and smaller than the diameter of a bolt head of the bolt 51, and a corresponding threaded hole is formed in a corresponding position of the substrate 1. In use, only the bolt 51 may be unscrewed without unscrewing the entire bolt 51 from the base 1, and since the diameter of the through hole in the press block 52 is larger than the diameter of the thread of the bolt 51, the press block 52 may be lifted to a position close to the bolt head of the bolt 51, and then the drain tube may be placed in the groove 2. And then the bolt 51 is rotated, so that the pressing block 52 is pressed by the bolt head to gradually press the drainage tube, and then the drainage tube can be cut or cut. After the above operation is completed, the drain tube can be released from the base 1 by unscrewing the bolt 51, and the manufactured drain tube can be taken out.

Preferably, as shown in FIG. 8 for the second fastening device, FIG. 8 is a cross-sectional view of the drainage tube cutting device along the direction A-A using the second fastening device for ease of understanding. The pressing block 52 is integrated with the base 1, a pressing groove 53 penetrating through the through hole 7 is formed in the side face of the base 1, when the bolt is unscrewed, the drainage tube can be freely penetrated in the through hole 7, and when the bolt is screwed, the pressing block 52 can be slightly deformed due to the flexibility of the material, so that the drainage tube is fixed on the base.

Further, the fastening device 5 may also have a structure such as a third fastening device shown in fig. 9, and for convenience of understanding, fig. 9 is a sectional view of the drainage tube cutting device in the A-A direction using the third fastening device. The pressing block 52 has one end hinged to the base 1 and the other end connected to the base 1 in a fastening manner, and the drainage tube can be fixed on the base 1 by fastening the fastening manner, and released from the base 1 by releasing the fastening manner. The pressing block 52 can rotate on a plane perpendicular to the longitudinal direction of the substrate 1, after the pressing block 52 is rotated upwards by opening the buckle, a drainage tube can be placed in the groove 2, then the pressing block 52 is rotated downwards, and the drainage tube positioned in the groove 2 can be clamped by clamping the buckle.

Further, as shown in fig. 1 to 6, a bevel groove 6 is further provided at a position adjacent to the head 3, and the bevel groove 6 can be any shape groove, so long as the drainage tube to be cut can be directly exposed in the field of view of an operator, and the operator can determine the inclined angle, depth and position of the barb according to actual needs. The preferred bevel groove 6 has a bevel of about a high height further from the head 3 for cutting a hole in the drain to form a barb. Preferably, the groove with a certain inclination and depth is shown in fig. 1, and the depth of the inclined groove 6 is preferably smaller than that of the groove 2, so that the drainage tube can be prevented from being cut through directly when the barb is cut, an operator can cut the barb with a required angle along the inclined surface of the inclined groove 6 through a preset inclined surface, the barb with a required angle is prevented from being formed, and the cut barb cannot be effectively blocked in the cavity body under the condition of unskilled operation, so that the effect of preventing the drainage tube from moving cannot be realized.

Further, the cutter 82 may be a separate blade, such as a drainage tube cutting device having a structure as shown in fig. 1, and the blade as the cutter 8 may be used as the cutter 82, so that an operator may cut the hole along the inclined surface groove 6 according to the use requirement.

Further, as shown in fig. 3 to 5, the slitting knife 82 may be attached to the guide rail 92, the guide rail 92 is fixed to the bottom plate 9 like the slide groove 91, the blade of the slitting knife 82 is aligned with the inclined surface groove 6, and the slitting knife 82 is slid on the guide rail 92 in the direction G1 to slit the drainage tube exposed in the inclined surface groove 6. More preferably, the angle of the edge of the slitting knife 82 is slightly rotatable to meet the requirements for barbs at different angles. Further, the utility model also provides a drainage tube intercepting method, which comprises the following steps of:

(1) Loosening the fastening release device 5;

(2) Inserting the drainage tube along the through hole 7 and placing the drainage tube into the groove 2;

(3) One end of the drainage tube is moved to the corresponding scale 4 according to the length of the drainage tube;

(4) Compressing the drainage tube by a fastening and releasing device 5;

(5) The drainage tube is cut off by a cutting knife 8.

For steps (1-4), when a different fastening release device 5 is used, as shown in fig. 9, one end of the pressing block 52 is hinged with the base 1, and the other end is snap-connected with the base 1. The buckle can be directly buckled, the pressing block 52 is rotated upwards, then the drainage tube to be cut is inserted along the through hole and placed in the groove 2, one end of the drainage tube which is not required to be cut is placed to the corresponding scale 4 of the required length according to the required length, and then the pressing block 52 is clamped on the substrate 1.

For the drainage tube intercepting device adopting the threaded connection to fasten the releasing device 5 and the substrate 1, the pressing block 52 and the substrate 1 are provided with corresponding threaded holes, and the pressing block 52 and the substrate 1 are connected through the bolts 51. In use, as in the fastening device shown in fig. 7, only the bolt 51 may be unscrewed without unscrewing the entire bolt 51 from the base 1, and since the diameter of the through-hole of the pressing block 52 is larger than the diameter of the thread of the bolt 51, the pressing block 52 may be lifted to a position close to the bolt head of the bolt 51, and then the drain tube may be placed in the groove 2. And then the bolt 51 is rotated, so that the pressing block 52 is pressed by the bolt head to gradually press the drainage tube, and then the length cutting and the hole cutting can be started to prepare barbs. And after the screw 51 is loosened, the drain tube can be released from the base 1, and the prepared drain tube can be taken out.

As shown in the fastening device of fig. 8, when the bolt 51 is unscrewed, the drainage tube can be freely inserted into the through hole 7, and when the bolt 51 is screwed, the pressing block 52 can be slightly deformed due to the flexibility of the material, so that the drainage tube is fixed on the substrate.

Further, for the device shown in fig. 1 in step (5), the cutting knife 8 and the hole cutter 82 are independent, and an operator can cut the cutting knife 8 along the cutting slit after compacting the drainage tube, so as to intercept the drainage tube with a required length.

Further, as shown in fig. 3 to 5, the through hole 7 is exposed for insertion of the drainage tube by sliding the cutter 8 in the direction H1 on the chute 91, and the drainage tube placed in the through hole 7 is cut by sliding the cutter 8 in the direction H2 so that the cutter 8 is inserted into the cutting slit.

Further, as shown in fig. 6, the cutter 8 is rotated to expose the through hole 7, the drainage tube is inserted into the through hole 7 and the groove 2, then the drainage tube is pressed, and the cutter 8 is rotated downwards to make the cutter surface contact with the plane, so that the drainage tube placed in the through hole 7 can be cut off.

Further, the method also comprises the following step (6): barbs were cut into the drainage tube surface along the bevel grooves 6 with a cutting knife. An operator can observe the drainage tube for cutting the barbs through the inclined surface groove 6, and can determine the inclination angle, depth and position of the barbs according to actual needs, so that the barbs meeting the requirements are cut on the surface of the drainage tube; for the inclined surface groove 6 shown in fig. 1-3, the inclined surface groove 6 is provided with an inclined surface which is more far away from the head part 3 and is about high, an operator can cut a knife along the inclined surface of the inclined surface groove 6 by a preset inclined surface, and barbs are formed on the surface of the drainage tube, so that the drainage tube cannot be effectively clamped in a cavity due to unqualified barbs under the condition of unskilled operation; further, since the depth of the inclined surface groove 6 is smaller than that of the groove 2, the drainage tube can be prevented from being cut through directly when the barbs are cut.

Still further, as with the apparatus shown in FIGS. 3-5, the operator need only slide the scalpel 82 on the rail 92 in the G1 direction to cut a hole in the drain tube exposed in the bevel groove 6. More preferably, an operator can firstly adjust the angle of the slitting knife according to the requirement and then perform slitting to prepare the barb.

Although not all embodiments are provided in the drawings of the present utility model, it is understood that the cutting means, fastening means and slitting means of different structures may be reasonably combined according to the use requirements, as long as the cutting and slitting functions can be achieved. In summary, by the drainage tube intercepting device and the drainage tube intercepting method provided by the utility model, a user can cut the drainage tube with the corresponding length according to the required length. Therefore, the hospital only needs to store the drainage tube with a certain length and enough length, and when the drainage tube is used, the drainage tube with the required length is cut off, a large amount of drainage tubes with various types are not required to be stored, and the requirements for the drainage tube with various lengths under various conditions can be fully met.

The foregoing description is examples of embodiments of the present utility model for more clearly illustrating the inventive concept, but is not intended to limit the scope of the claims. The above-described embodiments can be easily modified and adapted by a person skilled in the art in view of the inventive concept of the present utility model, which are all comprised in the scope of the appended claims.

Claims

1. A drainage tube intercepting device, which is characterized by comprising a substrate, a cutting knife and a fastening releasing device:

the fastening and releasing device is connected to the substrate and can fix and release the drainage tube relative to the substrate: the cutting knife is used for cutting the drainage tube:

the substrate is provided with grooves along the longitudinal direction:

the base has a head portion for inserting the cutter blade at one end in the longitudinal direction, the head portion is provided with a through hole in the longitudinal direction of the base, the through hole is communicated with the groove, and the drainage tube can be placed in the groove through the through hole:

scales are distributed on the substrate along the longitudinal direction of the groove and used for determining the length from one end of the drainage tube entering the groove to the cut part of the drainage tube;

forming a bevel groove at a position of the base adjacent to the head, the bevel groove having a bevel with a higher height farther from the head; the depth of the inclined plane groove is smaller than that of the groove, and a barb for enabling the drainage tube to be clamped in the cavity to avoid movement of the drainage tube can be formed on the drainage tube through the inclined plane cutting along the inclined plane cutting through a cutting knife.

2. The drain tube cutter device according to claim 1, wherein the head portion includes a protrusion portion in which a cutting slit for inserting the cutter blade is formed, the cutting slit having a depth greater than a depth of the through hole.

3. The drainage tube intercepting apparatus according to claim 2, wherein said cutter is fixed to a chute, and a blade of said cutter is aligned with said cutting slit, and said drainage tube placed in said through hole is cut by sliding said cutter along said chute.

4. The drainage tube intercepting apparatus according to claim 1, wherein a plane surface which is in flat contact with a blade surface of the cutter is formed at a front end of the head, the cutter is hinged to the head, and the drainage tube placed in the through hole is cut by rotating the cutter to make the blade surface contact with the plane surface.

5. The drain tube cutting device according to any one of claims 1-4, wherein the fastening and releasing means comprises a press block for pressing the drain tube.

6. The drainage tube intercepting device according to claim 5, wherein one end of the pressing block is hinged with the base, the other end of the pressing block is connected with the base in a buckling mode, the drainage tube can be fixed on the base through buckling buckles, and the drainage tube can be released from the base through unlocking the buckles.

7. The drainage tube intercepting device according to claim 5, wherein bolts penetrate through the pressing blocks, threaded holes are formed in corresponding positions of the base, the drainage tube can be fixed on the base when the bolts are screwed down, and the drainage tube can be released from the base when the bolts are unscrewed up.

8. The drain intercepting apparatus according to claim 7, wherein said slitting knife is fixed on a guide rail, and said slitting knife is slid along said guide rail to slit a hole in said drain.

9. A tube intercepting method, characterized in that the drainage tube intercepting device according to any one of claims 1-8 is used, comprising the steps of:

loosening the fastening release means:

inserting the drainage tube along the through hole and placing the drainage tube into the groove:

moving the end of the drainage tube to the corresponding scale according to the required length of the drainage tube: compressing the drainage tube with the fastening release device:

cutting off the drainage tube by the cutting knife.