JP7071803B2 - Drain tube manufacturing method - Google Patents

Description

The present invention relates to a method for manufacturing a drain tube.

Conventionally, a wound drain catheter in which a drain and an outflow tube are connected by a connector has been used as a surgical medical tool for draining body fluid such as blood accumulated in an affected area after surgery (for example, Patent Document). 1). In the drain of the wound drain catheter, a partition having a cross section extending from the tip to the rear is provided in the cylindrical outer wall to form four axially extending flow paths, and the four are formed on the outer wall. Slits extending along each of the flow paths are formed.

When using the wound drain catheter, for example, the drain and the connector part are inserted into the body to indwell the drain in the affected part, and the rear end side part of the outflow pipe is taken out of the body and connected to an aspirator or the like. do. As a result, blood or the like collected in the affected area enters the flow path through the slit portion of the drain and is discharged to the outside of the body through the outflow pipe.
However, a connector that connects the drain and the outflow pipe with such a connector requires connection work and is complicated to manufacture. Further, when the drain is pulled out from the body, the drain may come off from the connector and remain in the body, or the outflow pipe may come off from the connector and the drain and the connector may remain in the body.

In recent years, as a surgical medical device for discharging body fluid such as blood to the outside of the body, for example, a suction tube portion, a connecting tube portion, and an outflow tube portion are integrally formed in order from the tip, and the inside thereof is connected from the tip to the rear end. A drain tube with a flow path is widely used. In the drain tube, a partition portion having a cross section extending from the tip of the suction pipe portion to the rear end of the connecting pipe portion is provided in the suction pipe portion and the connecting pipe portion, and inside the suction pipe portion and the connecting pipe portion, Four flow paths extending in the axial direction partitioned by the partition portion are formed. The plurality of flow paths merge into one at the boundary between the connecting pipe portion and the outflow pipe portion. Further, on the outer wall of the suction tube portion, four slits extending along each flow path from the tip end to the rear end of the suction tube portion are formed so as to correspond to each of the four flow paths. The connecting pipe portion is not formed with a slit, and its axial length is usually about 100 mm.

When using the drain tube, the suction tube part and the connecting tube part are inserted into the body, the suction tube part is placed in the affected part, and the rear end side part of the outflow pipe part is taken out of the body and used as a suction machine or the like. Connecting.
Since the drain tube has a suction pipe portion, a connecting pipe portion, and an outflow pipe portion integrally formed, there is no possibility that the suction pipe portion will come off from the connecting pipe portion when it is pulled out from the body. Further, the drain tube can be easily manufactured by extrusion molding.

US Pat. No. 4,465,481

When such a drain tube is easily manufactured by extrusion molding, in order to obtain one product, as shown in FIG. 2, when cut between the suction pipe portion and the outflow pipe portion, a certain amount of waste portion is discarded. The production yield (productivity) was low.
Therefore, an object of the present invention is to provide a method for manufacturing a drain tube capable of improving productivity.

The present invention has the following configurations.
[1] A method for manufacturing a resin drain tube in which a suction pipe portion, a connecting pipe portion, and an outflow pipe portion are integrally formed in order from the tip, and a flow path leading from the tip to the rear end is formed inside them. , Extrude the resin from the extrusion molding machine, and repeat in the order of outflow pipe part, connecting pipe part, suction pipe part, connecting pipe part, outflow pipe part, connecting pipe part, suction pipe part, connecting pipe part in order from the tip side. When discharging so as to appear, the first suction pipe portion that is cut in the direction perpendicular to the pipe axis at the discharged first outflow pipe portion, and then first appears when viewed downstream from the first outflow pipe portion. In the step of obtaining the first drain tube by cutting in the direction perpendicular to the pipe axis, and in the second outflow pipe portion that first appears when viewed downstream from the cut portion of the first suction pipe portion. In the step of obtaining a second drain tube by cutting in the direction perpendicular to the pipe axis, and in the second suction pipe portion that first appears when viewed downstream from the cut portion of the second outflow pipe portion. A method for manufacturing a drain tube, comprising a step of obtaining a third drain tube by cutting in a direction perpendicular to the axis.
[2] From the position where the length of the outflow pipe portion in the pipe axis direction is divided into two equal parts, at a position 10% forward and backward in the pipe axis direction with respect to 100% of the length of the outflow pipe portion in the pipe axis direction. From the position where the suction tube portion is cut and the length of the suction tube portion in the tube axis direction is divided into two equal parts, at a position 10% forward and backward in the tube axis direction with respect to the length of the suction tube portion in the tube axis direction of 100%. The method for manufacturing a drain tube according to [1], wherein a drain tube is obtained by cutting.
[3] When the lengths of the drain tubes obtained in each step in the tube axis direction are compared, they are cut so that the ratio of the lengths to each other is 0.8 to 1.2, [1] or [ 2] The method for manufacturing a drain tube.
[4] The drain tube is cut at a position where the length of the outflow pipe portion in the pipe axis direction is substantially bisected, and the length of the suction pipe portion in the pipe axis direction is cut at a position where the length is substantially bisected. The method for manufacturing a drain tube according to any one of [1] to [3].

According to the method for manufacturing a drain tube of the present invention, the productivity of the drain tube can be improved.

It is the schematic which showed an example of the manufacturing method of the drain tube of this invention. It is a schematic diagram which showed an example of the manufacturing method of the conventional drain tube. It is a perspective view which showed an example of the drain tube obtained by the manufacturing method of the drain tube of this invention. It is an enlarged perspective view of the tip side of the suction tube part in the drain tube of FIG. It is XX sectional view of the drain tube of FIG. FIG. 3 is a cross-sectional view taken along the line YY of the drain tube of FIG. It is a ZZ sectional view of the drain tube of FIG.

FIG. 3 shows an example of a drain tube in which a suction pipe portion, a connecting pipe portion, and an outflow pipe portion are integrally formed, which are manufactured by the manufacturing method of the present invention. Details of each part of the drain tube will be described later, and here, an outline of each part will be briefly described.
In the present invention, the suction tube portion is located on the tip end side of the drain tube, and a plurality of flow paths are formed inside the outer wall by a partition portion, and a slit is formed in the outer wall from the tip along one or more of the flow paths. Means the part where is formed.
The outflow pipe portion means a portion located on the rear end side of the drain tube, having no partition portion inside the outer wall, and having no slit formed.
The connecting pipe portion means a portion of the drain tube located between the suction pipe portion and the outflow pipe portion, in which a plurality of flow paths are formed by the partition portion inside the outer wall and no slit is formed. The boundary between the suction pipe portion and the connecting pipe portion coincides with the position of the rear end of the longest slit among the slits formed on the outer wall of the drain tube so as to extend from the tip. The boundary between the connecting pipe portion and the outflow pipe portion coincides with the position of the rear end of the partition portion.
In the present specification, the tip end side of the drain tube and the upstream side of the drain tube are synonymous, and the rear end side of the drain tube and the downstream side of the drain tube are synonymous.

[Manufacturing method of drain tube]
In the method for manufacturing a drain tube of the present invention, a suction pipe portion, a connecting pipe portion, and an outflow pipe portion are integrally formed in order from the tip, and a resin drain in which a flow path leading from the tip to the rear end is formed. This is a method for manufacturing a tube.
In the present specification, for convenience of explanation, the outflow pipe portion, the connecting pipe portion, the suction pipe portion, the connecting pipe portion, the outflow pipe portion, the connecting pipe portion, the suction pipe portion, and the connecting pipe portion are repeated in this order from the tip side. These are described as obtaining a drain tube precursor integrally molded.
The drain tube precursor refers to all that obtain a drain tube by cutting the drain tube precursor. For example, the drain tube may be obtained by discharging the outflow pipe portion, the connecting pipe portion, and the suction pipe portion in order from the tip side, and cutting the suction pipe portion before the next connecting pipe portion is discharged. The molded body before cutting in this case is called a drain tube precursor.
Hereinafter, a method for manufacturing a drain tube according to an embodiment to which the present invention is applied will be described in detail with reference to the drawings. In addition, in the drawings used in the following explanation, in order to make the features easy to understand, the featured parts may be enlarged for convenience, and the dimensional ratios of each component may not be the same as the actual ones. not.

FIG. 1 is a schematic view showing an example of the method for manufacturing a drain tube of the present invention. The resin that is the raw material of the drain tube is extruded from the extruder 6 in the direction of the arrow in FIG.
The resin extruded from the extrusion molding machine 6 has an outflow pipe portion 4a, a connecting pipe portion 3a, a suction pipe portion 2a, a connecting pipe portion 3b, an outflow pipe portion 4b, a connecting pipe portion 3c, and a suction pipe portion 2b in order from the tip side. The connecting pipe portion 3d and the outflow pipe portion 4c are repeatedly molded in this order to obtain a drain tube precursor 5 in which these are integrally molded.
Each time the mold provided in the extruder 6 is switched, the shape of each part to be formed is switched. For the convenience of this switching, the connecting pipe portion 3 is always formed between the suction pipe portion 2 and the outflow pipe portion 4. The length of each part of the drain tube precursor 5 can be appropriately set by adjusting the switching timing and the extrusion amount of the resin. However, even if the length of the connecting pipe portion 3 is made the shortest, the length of the connecting pipe portion 3 does not become zero.

Next, the drain tube precursor 5 is cut in the direction perpendicular to the tube axis O1 of the drain tube precursor 5 at the first outflow pipe portion 4a on the distal end side. The portion where the first outflow pipe portion 4a is cut is defined as 7a. Subsequently, the first drain tube 1A is obtained by cutting in the first suction tube portion 2a that first appears from the first outflow tube portion 4a toward the rear end side in the direction perpendicular to the pipe axis O1. The portion where the first suction tube portion 2a is cut is defined as 7b.
Here, assuming that the length of the first suction tube portion 2a in the tube axis direction is Ma, the distance from the position where Ma is bisected (hereinafter, also referred to as "center") is 0.1 Ma in the front-rear direction in the tube axis direction. It is preferable to cut the first suction tube portion 2a at the position of (a position at a distance of 10% in the front-rear direction from the center in the tube axis direction when Ma is 100%). From the viewpoint of producing a drain tube having a uniform length, it is more preferable that the first drain tube 1A is obtained by substantially halving the length of the first suction tube portion 2a in the tube axial direction.

Next, the second drain tube is cut in the direction perpendicular to the pipe axis O1 at the second outflow pipe portion 4b that first appears from the cut portion 7b of the first suction pipe portion 2a toward the rear end side. Get 1B. The portion where the second outflow pipe portion 4b is cut is defined as 7c.
Here, assuming that the length of the second outflow pipe portion 4b in the pipe axis direction is Nb, the distance from the position where Nb is bisected (hereinafter, also referred to as “center”) is 0.1 Nb in the front-rear direction in the pipe axis direction. It is preferable to cut the second outflow pipe portion 4b at the position of (a position at a distance of 10% in the front-rear direction from the center in the pipe axis direction when Nb is 100%). From the viewpoint of producing a drain tube having a uniform length, it is more preferable that the second drain tube 1B is obtained by substantially bisecting the length of the second outflow pipe portion 4b in the pipe axis direction.
Hereinafter, the position for cutting the suction pipe portion or the outflow pipe portion is 10% forward and backward from the position (center) in which each pipe axial direction is bisected when the length in each pipe axial direction is 100%. It is preferably a distance position (hereinafter, this position is also referred to as a “central part”), and more preferably a bisected position (center).
The second outflow pipe portion may be cut while the second outflow pipe portion 4b is being formed. In that case, the position for cutting the second outflow pipe portion is the length of Nb and the resin. It can be determined from the discharge speed.
Hereinafter, the same applies to the suction pipe portion to be discharged after that and the outflow pipe portion to be discharged after that.

Next, the third drain tube is cut in the direction perpendicular to the pipe axis O1 at the second suction pipe portion 2b that first appears when viewed from the cut portion 7c of the second outflow pipe portion 4b toward the rear end side. Get 1C. The portion where the second suction tube portion 2b is cut is defined as 7d. The position of 7d is preferably the center of the length Mb of the second suction tube portion 2b in the tube axis direction, and more preferably the center of the Mb.

Assuming that the length of the first drain tube 1A in the tube axis direction is LA, the length of the second drain tube 1B in the tube axis direction is LB, and the length of the third drain tube 1C in the tube axis direction is LC, it is assumed. It is preferable to cut so that the ratio of each length (LB / LA, LC / LB, LA / LC) is 0.8 to 1.2. When the ratio of each length is within the above range, it is easy to obtain a drain tube of uniform length, and it is not necessary to cut again to adjust the length, which can further improve the productivity of the drain tube. can.
For the same reason as above, when comparing the lengths of each drain tube obtained in each step in the tube axis direction, it is possible to cut so that the ratio of the lengths to each other is 0.8 to 1.2. preferable.

In the above, it has been described that there is a step of obtaining the first to third drain tubes, but by cutting the rear end side of the drain tube precursor 5 in the same manner in order, the fourth drain tube 1D, the fifth drain tube 5 (1E is not shown in FIG. 1), followed by 4 or more drain tubes. The length LD of the fourth drain tube 1D in the tube axial direction is also preferably cut so that the ratio to the length of the other drain tubes in the tube axial direction is 0.8 to 1.2. The portion where the third outflow pipe portion 4c is cut is defined as 7e.
In the embodiment described above, the case where the outflow pipe portion 4a is located at the tip of the drain tube precursor 5 has been described, but as long as the relative arrangement (order) of the extruded portions is as described above, the drain tube precursor There may be a connecting tube portion 3a or a suction tube portion 2a at the tip of the body 5.

Subsequently, an embodiment of a conventional method for manufacturing a drain tube will be described with reference to FIG.
FIG. 2 is a schematic view showing an example of a conventional method for manufacturing a drain tube. The resin that is the raw material of the drain tube is extruded from the extruder 6'in the direction of the arrow in FIG.
The resin extruded from the extruder 6'is the outflow pipe portion 4a', the connecting pipe portion 3a', the suction pipe portion 2a', the connecting pipe portion 3b', the outflow pipe portion 4b', and the connecting pipe portion 3c in this order from the tip side. ', Suction pipe 2b', connecting pipe 3d', outflow pipe 4c', connecting pipe 3e', suction pipe 2c', connecting pipe 3f', outflow pipe 4d', and so on. A drain tube precursor 5'in which these are integrally formed is obtained.
The process until the drain tube precursor 5'is obtained is the same as the method for producing a drain tube of the present invention.

In the conventional method for manufacturing a drain tube, the drain tube precursor 5'is arranged so as to be the outflow pipe portion 4a', the connecting pipe portion 3a', and the suction pipe portion 2a' in order from the tip side, and the drain tube precursor 5'is a tube. Cut in the direction perpendicular to the axis O2.
As shown in FIG. 2, the portion 7'where the drain tube precursor 5'is cut is located on the rear end side (rear end side) of the first outflow pipe portion 4a'(7a') and the first suction pipe portion 2a'. 7b'), tip side (7c') from the center of the second outflow pipe part 4b', rear end side (7d') from the center part of the second suction pipe part 2b', third outflow pipe The tip side (7e') from the central part of the part 4c', the rear end side (7f') from the central part of the third suction pipe part 2c', and the tip side from the central part of the fourth outflow pipe part 4d'. The side (7g').
Ma', Mb', and Mc'represent the length of the first suction tube portion 2a', the length of the second suction tube portion 2b', and the length of the third suction tube portion 2c', respectively, and Nb'. , Nc'represent the length of the second outflow pipe portion 4b'and the length of the third outflow pipe portion 4c', respectively.

By cutting the drain tube precursor 5'at each of the above points, a first drain tube 1A', a second drain tube 1B', and a third drain tube 1C'are obtained.
In the conventional method for manufacturing a drain tube, a drain tube to be a product is obtained, and a discarded portion 8A is generated between the second cutting portion 7b'and the third cutting portion 7c'.
In order to reduce the discarded portion 8A, it is conceivable to shorten the connecting pipe portion 3b', but in order to integrally form the drain tube precursor 5', that is, to form the drain tube continuously. , The connecting pipe portion 3b'cannot be set to zero.
Therefore, in the conventional drain tube manufacturing method, the discarded portion 8A cannot be reduced to zero, and the productivity is low. The same applies to the other discarded portions 8B to 8C on the rear end side of the drain tube precursor 5'.

Further, in the conventional drain tube manufacturing method, the drain tube precursor is located in the vicinity of the switching portion between the suction pipe portion 2a'and the connecting pipe portion 3b'and the switching portion between the connecting pipe portion 3b'and the outflow pipe portion 4b'. 5'is cut (7b'and 7c'). In these switching portions, the amount of resin discharged tends to be unstable, and reflecting this, the inner diameter of the drain tube also varies slightly. Conventionally, cutting is performed at a portion where these inner diameters vary, which contributes to the variation in the inner diameter of the cut end of the manufactured drain tube.
When the inner diameter of the drain tube varies, the periphery of the cut portion is further cut to deal with it, so that the discarded portion is further increased and the productivity is lowered.

[Drain tube]
Next, an example of the drain tube obtained by the manufacturing method of the present invention will be described.
As shown in FIG. 3, the drain tube 1 obtained by the manufacturing method of the present invention is a resin tube in which a suction pipe portion 2, a connecting pipe portion 3 and an outflow pipe portion 4 are integrally formed in order from the tip 1α. .. The suction pipe portion 2, the connecting pipe portion 3, and the outflow pipe portion 4 are provided with a cylindrical flexible outer wall 10, and a flow path leading from the front end 1α to the rear end 1β is formed inside the outer wall 10. There is.

In the present embodiment, the thickness of the outer wall depends on the outer diameter of the drain tube, the material, etc., in consideration of the flexibility of the drain tube, the resistance to crushing when inserted into the body, the resistance to cutting during the milking operation, and the like. It may be set appropriately. The thickness of the outer wall can be, for example, 0.4 to 2.0 mm.

As shown in FIGS. 4 to 7, a partition portion 12 extending from the tip end 1α to the rear end 3α of the connecting pipe portion 3 is provided in the suction pipe portion 2 and the connecting pipe portion 3.
The partition portion 12 of the present embodiment has a rod-shaped core portion 14 extending along the central axis inside the suction pipe portion 2 and the connecting pipe portion 3, and the suction pipe portion 2 extending from the core portion 14 to the inner surface of the outer wall 10. And four strip-shaped partition plates 16 formed so as to extend in the axial direction of the connecting pipe portion 3.

The four partition plates 16 are formed radially from the core portion 14 at intervals of 90 degrees around the pipe axis in a cross section cut in a direction perpendicular to the pipe axis of the drain tube 1. As a result, four flow paths 20 partitioned around the central axis by the partition portion 12 are formed inside the suction pipe portion 2 and the connecting pipe portion 3. As shown in FIGS. 6 and 7, the four flow paths formed inside the suction pipe portion 2 and the connecting pipe portion 3 merge at the boundary portion between the connecting pipe portion 3 and the outflow pipe portion 4, and the outflow pipe portion There is one flow path 22 in 4.

The thickness of the partition plate is not particularly limited, and may be appropriately set in consideration of the width of the flow path partitioned by the partition plate, the difficulty of crushing the suction pipe portion and the connecting pipe portion when inserted into the body, and the like. .. The thickness of the partition plate can be, for example, 0.4 to 1.0 mm.
The thickness of the partition plate may be constant or variable from the core to the outer wall. The thickness of the partition plate is preferably constant from the core portion to the outer wall in that it is easy to prevent the partition plate from bending and crushing the suction pipe portion and the connecting pipe portion.

In the drain tube obtained by the manufacturing method of the present invention, the number of flow paths formed inside the suction pipe portion and the connecting pipe portion is not limited to 4, but may be 3 or less, and may be 5 or more. You may. For example, in a cross section cut in a direction perpendicular to the axial direction of the drain tube, a partition portion in which three partition plates are formed radially from the core portion at intervals of 120 degrees around the axis in the suction pipe portion and the connecting pipe portion. It may be an embodiment in which three flow paths are formed around the central axis by the partition portion inside the suction pipe portion and the connecting pipe portion.

As the number of flow paths increases, the number of partition plates of the partition portion increases, so that the flexibility of the suction tube portion decreases, and it tends to be difficult to place the suction tube portion at a target position in the body. Further, the flow path tends to be narrowed and the suction amount tends to decrease, and the suction tube portion and the connecting tube portion tend to be less likely to be crushed when inserted into the body. In terms of the balance between the ease of indwelling the suction tube at the target position, the width of the flow path, and the difficulty of crushing the suction tube and the connecting tube when inserted into the body, the suction tube and the connecting tube The number of flow paths formed inside the above is preferably 2 to 4, and particularly preferably 4.

As shown in FIGS. 3 to 5, four slits 18 extending along each of the four flow paths 20 partitioned by the partition portion 12 are provided on the outer wall 10 of the suction pipe portion 2 from the tip 1α to the suction pipe portion 2. It is formed up to the rear end 2α. That is, the outer wall 10 of the suction tube portion 2 is formed with a slit 18 extending from the tip end 1α to the rear end 2α of the suction tube portion 2 at a position corresponding to each of the four flow paths 20.
Since the slit 18 is formed in the outer wall 10 of the suction tube portion 2, the body fluid can be sucked into the flow path 20 from the outer peripheral portion of the suction tube portion 2 through the slit 18. This makes it possible to suck out body fluid from a wider area in the body than when there is no slit.

In the drain tube obtained by the manufacturing method of the present invention, the slit formed in the suction tube portion extends along the tube axial direction of the drain tube, and the tip thereof reaches the tip of the drain tube. As a result, even if the internal tissue grows so as to enter the slit portion when the suction tube portion is indwelled in the body, the internal tissue moves along the slit in the suction tube portion when the suction tube portion is pulled out of the body. You can move to the tip and pull out. Therefore, it is possible to prevent the internal tissue that has entered the slit portion from being torn when the suction tube portion is pulled out of the body.

The width of the slit may be appropriately determined according to the outer diameter of the drain tube, etc., in consideration of the outer diameter of the suction tube portion, the suction amount of body fluid, and the like. The width of the slit can be, for example, 0.4 to 1.2 mm.

In the drain tube obtained by the production method of the present invention, the number of slits is not limited to 4, and may be 3 or less, or 5 or more. Further, the number of slits formed on the outer wall of the suction tube portion may be the same as or different from the number of flow paths formed inside the suction tube portion.
For example, when four flow paths are formed inside the suction tube portion as in the drain tube 1, the outer wall corresponding to each of the three flow paths of the four flow paths of the suction tube portion is formed from the tip. It may be an embodiment in which three slits are formed.

When a plurality of slits are formed on the outer wall of the suction tube portion, the lengths of the slits may be the same or different.
The length of the suction tube portion in the tube axis direction is not particularly limited, and may be appropriately determined in consideration of the position where the drain tube is placed in the body.

In the drain tube obtained by the production method of the present invention, the length of the connecting pipe portion in the pipe axial direction is preferably 30 to 150 mm, more preferably 50 to 100 mm. When the length of the connecting pipe portion in the pipe axis direction is at least the above lower limit value, the drain tube can be manufactured more easily. When the length of the connecting pipe portion in the pipe axis direction is equal to or less than the upper limit value, the flow resistance in the connecting pipe portion becomes smaller, and it is easy to sufficiently increase the suction amount even if the suction by the suction machine is not strong. Become. Therefore, it becomes easy to discharge the body fluid accumulated in the body in a short period of time, and the flow path is less likely to be clogged.

The outflow pipe portion 4 is a portion in which at least a part on the rear end side is exposed to the outside of the body at the time of use. When the drain tube 1 is used, the rear end of the outflow pipe portion 4 is connected to a suction machine or the like.
In the outflow pipe portion 4, the partition portion 12 is not provided in the outer wall 10, and the inside is one flow path 22.
The length of the outflow pipe portion 4 is not particularly limited and can be appropriately set.

The outer diameter of the drain tube is not particularly limited and may be appropriately set according to the intended use. The outer diameter of the drain tube can be, for example, 2 to 10 mm.
The outer diameters of the suction pipe portion, the connecting pipe portion, and the outflow pipe portion are preferably the same from the viewpoint of easy insertion into and withdrawal from the body. The outer diameters of the suction pipe portion, the connecting pipe portion, and the outflow pipe portion may be different as long as the effect of the present invention, the insertability into the body, and the pullability to the outside are not impaired.

Silicone rubber is preferable as the material for forming the drain tube obtained by the production method of the present invention. Silicone rubber is more flexible than flexible polyurethane and the like. Therefore, by forming the drain tube with silicone rubber, it becomes easy to indwell the suction tube portion at a target position in the body.

It is preferable to add a contrast medium to the drain tube to enable contrast using X-rays. In particular, it is preferable to add a contrast medium to the suction tube portion and the connecting tube portion, which are the portions inserted into the body in the drain tube. This makes it possible to confirm whether or not the suction tube portion has been placed at a target position in the body. Further, even if the suction tube portion or the connecting tube portion is torn off when the tube is pulled out, the cut portion existing in the body can be confirmed, so that the tube can be prevented from being left behind in the body unexpectedly.

As the contrast medium, known ones can be used, and examples thereof include barium sulfate and titanium oxide.
As the contrast medium, one type may be used alone, or two or more types may be used in combination.

As the amount of the contrast medium blended into the drain tube increases, the strength of the drain tube tends to decrease and the drain tube tends to be easily cut, or the drain tube tends to be easily crushed when inserted into the body. Therefore, when the contrast medium is blended in the drain tube, it is preferable to partially blend the contrast medium in a specific portion of the drain tube.
Specifically, for example, in the case of the drain tube 1, a contrast medium can be blended into one of the four partition plates 16 in the partition portion 12 from the front end to the rear end thereof. Further, a contrast medium can be added to a part of the outer wall of the suction tube portion 2, the connecting tube portion 3 and the outflow tube portion 4.

When using the drain tube 1, the suction tube 2 and the connecting tube 3 are inserted into the body, the suction tube 2 is placed in the affected area, and the rear end side portion of the outflow tube 4 is taken out of the body. Connect to a suction machine, etc. By sucking with a suction machine or the like in this state, blood or the like collected in the affected part enters the flow path 20 from the slit 18 part of the drain tube 1, and is discharged to the outside of the body through the connecting pipe part 3 and the outflow pipe part 4.

As described above, in the method for manufacturing a drain tube of the present invention, the discarded portion can be reduced to zero by devising a portion for cutting the drain tube precursor.
Therefore, the method for manufacturing a drain tube of the present invention can further increase the productivity of the drain tube as compared with the conventional method for manufacturing a drain tube.
In addition, in the present invention, when the drain tube precursor is cut at the central portion of the outflow pipe portion or the central portion of the suction pipe portion, the drain tube precursor is cut at a position where the discharge amount of the resin is likely to be stable. It is possible to suppress variations in the inner diameter of the pipe.
Further, in the present invention, when the drain tube precursor is cut at the central portion of the outflow pipe portion or the central portion of the suction pipe portion, the drain tube having a uniform length can be sequentially manufactured.

1 Drain tube 2 Suction pipe part 3 Connecting pipe part 4 Outflow pipe part 5 Drain tube precursor 6 Extrusion molding machine 7 Cutting part 8 Disposal part 10 Outer wall 12 Partition part 14 Core part 16 Partition plate 18 Slit 20, 22 Flow path O1, O2 pipe shaft

Claims (4)

A method for manufacturing a resin drain tube in which a suction pipe portion, a connecting pipe portion, and an outflow pipe portion are integrally formed in order from the tip, and a flow path leading from the tip to the rear end is formed inside them.
The drain tube has the following structures (1) to (4).
The resin is extruded from the extrusion molding machine, and the outflow pipe part, the connecting pipe part, the suction pipe part, the connecting pipe part, the outflow pipe part, the connecting pipe part, the suction pipe part, and the connecting pipe part appear repeatedly in this order from the tip side. When discharging
Cut in the direction perpendicular to the pipe axis at the first outflow pipe that was discharged,
Subsequently, a step of obtaining a first drain tube by cutting in a direction perpendicular to the pipe axis in the first suction pipe portion that first appears in the order of being extruded after the first outflow pipe portion.
A step of obtaining a second drain tube by cutting in a direction perpendicular to the pipe axis in a second outflow pipe portion that first appears in the order of being extruded after the cut portion of the first suction pipe portion.
A step of obtaining a third drain tube by cutting in a direction perpendicular to the pipe axis in the second suction pipe portion that first appears in the order of being extruded after the cut portion of the second outflow pipe portion. A method for manufacturing a drain tube having.
(1) The suction pipe portion is a portion in which a plurality of flow paths are formed inside the outer wall of the pipe by a partition portion, and a slit is formed in the outer wall along one or more of the flow paths.
(2) The connecting pipe portion is a portion in which a plurality of flow paths are formed by a partition portion inside the outer wall of the pipe and no slit is formed in the outer wall.
(3) The outflow pipe portion is a portion having no partition portion inside the outer wall of the pipe and having no slit formed in the outer wall.
(4) In a cross section cut in a direction perpendicular to the pipe axis of the drain tube, the suction pipe portion, the connecting pipe portion, and the outflow pipe portion have different cross-sectional shapes. From the position where the length of the outflow pipe portion in the pipe axis direction is divided into two equal parts, the distance range is 10% in front of or behind the pipe axis direction with respect to 100% of the length of the outflow pipe portion in the pipe axis direction. Cut at one place inside and
From the position where the length of the suction tube portion in the tube axis direction is divided into two equal parts, the distance range is 10% in front of or behind the tube axis direction with respect to 100% of the length of the suction tube portion in the tube axis direction. The method for manufacturing a drain tube according to claim 1, wherein the drain tube is obtained by cutting at one place inside . The invention according to claim 1 or 2, wherein when the lengths of the respective drain tubes obtained in each step in the tube axial direction are compared, the drain tubes are cut so that the ratio of the lengths to each other is 0.8 to 1.2. How to make a drain tube. A drain tube is obtained by cutting at a position where the length of the outflow pipe portion in the pipe axis direction is substantially bisected and by cutting at a position where the length of the suction pipe portion in the pipe axis direction is substantially bisected. The method for manufacturing a drain tube according to any one of claims 1 to 3.

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