JP6186818B2 - Drain catheter - Google Patents

Description

  The present invention relates to a drain catheter.

  In the medical field, drainage means drainage, which drains blood, pus, exudate, digestive fluid, air, etc. out of the patient's body. A medical tube to be inserted for drainage is called a drain catheter, and various drain catheters are used by medical departments.

  However, in the conventional drain catheter, since suction is performed by the side hole and the tip hole, an organ or the like, which is a soft tissue, is sucked, and this may adhere to the side hole or the like. Furthermore, adverse events such as perforation may occur due to close contact of the tip. On the other hand, for example, in the catheter disclosed in Patent Document 1, a so-called pigtail having a curved tip is provided, and a side hole extending in the longitudinal direction is provided on the outer peripheral surface of the pigtail. This prevents close contact with the tissue.

Japanese Utility Model 5-76448

  However, although the catheter as described above has a pigtail, its performance is not sufficient. For example, in the above catheter, since the side hole and the opening channel at the tip are connected to one channel, there is a problem that if the channel is blocked, the liquid cannot be drained or exhausted.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a drain catheter excellent in drainage / exhaust properties.

  A drain catheter according to the present invention includes a cylindrical drainage section, and a cylindrical liquid collection section that is connected to a distal end side of the drainage section and has a curved section that is curved at least partially. The liquid part has a branch region provided with at least one partition wall for forming a plurality of flow paths in at least a part of the axial direction, and the internal space of the branch region of the liquid collection part is formed by the partition wall. The liquid collecting section is partitioned into at least one main flow path and at least one sub flow path extending over the entire length of the liquid collection section, and the main flow path and the sub flow path communicate with the internal space of the drainage section, respectively. The front end of the main channel in the axial direction opens to the outside through a front end opening formed at the front end of the liquid collection unit, and the sub-channels are formed on the outer peripheral surface of the branch region. It opens to the outside through a surface opening.

  In the drain catheter according to the present invention, a curved portion is formed in the liquid collection portion in order to prevent formation of perforations in the soft tissue. According to the present invention, since a plurality of flow paths are formed in the liquid collection part, and an opening to the outside is formed in each of these flow paths, one flow path is blocked by sucking soft tissue. Even so, since suction from other flow paths is possible, it is possible to prevent defective drainage and exhaust. The peripheral surface opening can be provided either in a portion communicating with the main flow path in the branch region or in a liquid collecting portion other than the branch region.

  Moreover, since the partition which partitions a main flow path and a subchannel is formed in the liquid collection part, the external shape of a liquid collection part can be reinforced from the inside. Therefore, it is possible to prevent kinking when the drain catheter is bent.

  The liquid collection part of the drain catheter can be provided with a circumferential opening at any position. That is, it is possible to provide a peripheral surface opening in the curved portion. In addition, the liquid collection part can be provided with at least one straight part connected to the curved part and extending linearly, and the peripheral surface opening can be formed in the straight part. As described above, when the circumferential surface opening is formed in the straight portion, the shape of the opening is less likely to be deformed than in the case where the circumferential surface opening is formed in the curved portion. That is, for example, when an opening is formed in the bending portion, the opening is likely to be deformed when an external force that changes the diameter of the bending portion is applied. Therefore, more stable suction is possible.

  In the drain catheter, the position of the straight portion is not particularly limited, but can be disposed between the drainage portion and the bending portion.

  Alternatively, in the drain catheter, the straight portion can be disposed on the distal end side with respect to the bending portion. Straight portions can also be provided at two locations. In this case, the straight portions can be provided between the drainage portion and the bending portion and at two locations on the tip side of the bending portion.

  In the drain catheter, the circumferential surface opening of the liquid collection part can be formed in various shapes, but can be formed in a slit shape extending along the axial direction of the liquid collection part, for example. Thereby, a suction area can be expanded.

  The tip end portion in the axial direction of the sub-flow channel can be terminated inside the liquid collecting portion.

  Alternatively, the tip end portion in the axial direction of the sub-channel can be communicated with the main channel inside the liquid collection unit. If it does in this way, when the main channel is closed in a branch field, it will become possible to drain from a tip opening through a subchannel.

  In the drain catheter, the peripheral surface opening can be formed on the inner surface side of the bending portion.

  In the drain catheter, the number of the sub-flow channels is not particularly limited, but two, for example, can be provided.

  The drain catheter according to the present invention can improve drainage / exhaust performance.

It is a perspective view which shows one Embodiment of the drain catheter of this invention. It is a side view of FIG. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is CC sectional view taken on the line in FIG. It is the DD sectional view taken on the line in FIG. It is a partial side view which shows the other example of the drain catheter shown in FIG. It is a side view which shows the other example of the drain catheter shown in FIG. It is a side view which shows the other example of the drain catheter shown in FIG. It is a figure which shows the other example of the cross section of a drain catheter.

<1. Drain catheter structure>
Hereinafter, an embodiment of a drain catheter according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a drain catheter according to the present embodiment, and FIG. 2 is a side view of FIG. In the following description, the left side in FIG. 2 is referred to as the front end side or the front side, and the right side is referred to as the base end side or the rear side, and other drawings will also be described based on this. A line passing through the center of the cross section of the drain catheter is defined as an axis X.

  As shown in FIGS. 1 and 2, this drain catheter is composed of a molded body extending in a long shape with an outer peripheral portion formed in a substantially circumferential shape. Specifically, the hub 1, the drainage unit 2, and the liquid collection unit 3 are connected in this order from the base end side to the tip end side. These members 1, 2, and 3 are joined by adhesion, heat fusion, or the like. Moreover, the liquid collection part 3 is comprised by the straight part 31 extended linearly, and the curved part 32 in which a part curves. Hereinafter, each part will be described.

  The hub 1 is provided at the tail end of the drain catheter, and is formed in a cylindrical shape by a hard resin material. The base end side of the hub 1 is detachably connected to a suction device (not shown) as will be described later. Specifically, a pair of protrusions 11 are formed on the peripheral edge of the rear end of the hub 1 so as to protrude radially outward with the axis X therebetween. The protrusion 11 is screwed into the suction device.

  Next, the drainage part 2 and the liquid collection part 3 will be described with reference to FIGS. 3 is a cross-sectional view taken along line AA in FIG. 2, FIG. 4 is a cross-sectional view taken along line BB in FIG. 2, and FIG. 5 is a cross-sectional view taken along line CC in FIG. As shown in FIGS. 1 to 3, a cylindrical drainage portion 2 is attached to the distal end side of the hub 1. The drainage part 2 is formed of a transparent flexible resin material, and occupies most of the length of the drain catheter. As shown in FIG. 3, the cross-sectional shape of the internal space 20 of the drainage part 2 is circular. And the liquid collection part 3 is connected to the edge part of the front end side of this drainage part 2. As shown in FIG.

  The liquid collection unit 3 includes a straight portion 31 connected to the distal end side of the drainage portion 2 and extending linearly, and a curved portion 32 connected to the distal end side, and is colored transparent or white. It is made of a flexible resin material. As shown in FIG. 4, the straight portion 31 has substantially the same outer diameter as the drainage portion 2, and the outer peripheral surface of the straight portion 31 has two slits (peripheral surface openings) 33 a that communicate with the inside. 33b is formed. Each of the slits 33a and 33b extends in the axial direction and is formed at a predetermined interval in the circumferential direction. Although the number of slits is not particularly limited, the number of flow paths branching increases as the number of slits increases, and as a result, the flow path becomes narrower when the diameter is the same. Therefore, the number of slits is preferably 2 to 6, more preferably 2 to 4, and particularly preferably 2.

  The inside of the straight part 31 has three flow paths that are partitioned by three partition walls and extend in the axial direction. More specifically, the three partition walls, that is, the first, second, and third partition walls 34 a, 34 b, 34 c extend radially outward from the axis X of the straight portion 31 and are connected to the inner wall surface of the straight portion 31. ing. The partition walls 34a, 34b, and 34c are connected at an angle of about 120 degrees. As a result, three flow passages having substantially the same size in section are formed in the straight portion 31. . Hereinafter, these are referred to as first, second, and third flow paths 35a, 35b, and 35c. Further, the proximal end sides of these three flow paths 35 a, 35 b, and 35 c communicate with the internal space 20 of the drainage unit 2. Of the three channels 35a, 35b, and 35c, the slits 33a and 33b described above are formed on the outer peripheral surface of the straight portion 31 corresponding to the first and second channels 35a and 35b. That is, the slit 33a communicates with the first flow path 35a, and the slit 33b communicates with the second flow path 35b.

  A cylindrical curved portion 32 is integrally formed on the distal end side of the straight portion 31. As described above, the base end sides of the three flow paths 35a, 35b, and 35c communicate with the internal space 20 of the drainage unit 2, but the third flow path among the three flow paths 35a, 35b, and 35c. Only the distal end side of the path 35 c communicates with the bending portion 32. On the other hand, the first and second flow paths 35a and 35b terminate near the tip of the straight portion 31, do not communicate with the curved portion 32, and are not open to the outside.

  As shown in FIGS. 1 and 2, the bending portion 32 is bent in a U shape from the distal end of the straight portion 31, and the distal end side extends linearly toward the proximal end side of the catheter. As shown in FIG. 5, the cross-sectional shape of the internal space 30 of the bending part 32 is circular. And the front-end | tip part of the curved part 32 is formed in a taper shape, and the front-end | tip opening 36 is formed in the front-end | tip. The tip opening 36 communicates with the internal space 30 of the bending portion 32. That is, the third flow path 35 c of the straight portion 31 described above communicates with the tip opening 36 through the internal space 30 of the bending portion 32.

  As shown in FIG. 2, a plurality of side holes 37 are formed on the outer peripheral surface of the curved portion 32 on the surface facing the base end side (the inner surface having a small radius of curvature). Each side hole 37 is formed in a circular shape, and is formed in a line along the axis X at a predetermined interval. These side holes 37 communicate with the internal space 30 of the bending portion 32.

  As shown in FIGS. 1 to 5, a linear mark made of an impermeable material that does not transmit X-rays is formed on the outer peripheral surface or inner wall surface from the drainage portion 2 of the drain catheter to the vicinity of the tip of the liquid collection portion 3. 8 is provided. This mark 8 extends along the axial direction and is used for recognizing the position of the third flow path 35c of the straight portion 31. In addition, when the drain catheter is placed in the patient's body, X-ray irradiation is performed. It is also used as a contrast marker when performing a predetermined confirmation operation. The place where the mark 8 is provided is not particularly limited, and may be provided at a position where the flow paths of the slits 33a and 33b can be recognized as necessary. When the mark 8 is provided on the inner wall surface of the drain catheter, the portion needs to be formed of a transparent material in order to be visible from the outside.

  The material of the drainage part 2 and the liquid collection part 3 of the drain catheter described above may be any material that is placed in the body, particularly in a blood vessel, and has a safe elasticity. Examples of such materials include polyurethane, silicone, polyvinyl chloride, polybutadiene, polyamide, ethylene-vinyl acetate copolymer, etc., but have the property of maintaining hardness and flexibility in the body. It is preferable to use polyurethane. By forming the material having such flexibility, the curved portion 32 of the liquid collecting portion 3 is flexibly deformed, and for example, the vicinity of the linear tip portion can also be curved (see the broken line in FIG. 2). . Moreover, when inserting a catheter by the Seldinger method mentioned later, it can be made to deform | transform until the bending part 32 becomes linear form.

  In addition, the drain catheter may be subjected to antithrombotic treatment in order to prevent thrombus formation upon contact with blood during placement. Antithrombotic treatment is a method in which a plasminogen activator such as urokinase is immobilized on the catheter surface of the base material by a chemical bonding method (for details, refer to Japanese Patent No. 1406830), and an anticoagulation factor such as heparin is immobilized on the catheter surface. Various methods have been developed, such as a method for realizing the above, but the method is not limited to a specific method. Further, the antithrombotic treatment range may be the inner surface, the outer surface, or both of the drain catheter as long as it is a portion that comes into contact with the living body.

  Further, the drain catheter has been subjected to a lubrication treatment such as coating the surface of a base material with a hydrophilic polymer compound in order to facilitate insertion into a subcutaneous tissue or blood vessel (for example, see Japanese Patent Application Laid-Open No. Hei 10-101). 248919). Many methods have been developed for the lubricity treatment, and any method may be selected. The range of the lubrication treatment may be any part as long as it is a part that comes into contact with the human body or a part that comes into contact with a tool or the like for placing the catheter.

  The drain catheter can be of various lengths, for example, the total length can be about 50-500 mm, preferably 100-300 mm. Among these, the liquid collection part 3 can be 10-300 mm, Preferably it is 15-200, More preferably, it can be 20-100 mm. The outer diameter of the drain catheter can be set to about 1 to 10 mm, more preferably 2 to 6 mm, and still more preferably 2 to 4 mm. The inner diameter of the drainage part 2 can be set to 90% to 30%, preferably 70% to 50% of the outer diameter.

<2. How to use drain catheter>
Next, a method for using the drain catheter configured as described above will be described. First, local anesthesia is performed on the insertion site of the drain catheter, and subsequently, the drain catheter is placed at the target site by the Seldinger method. Specifically, a metal puncture needle is punctured at a target site, and a guide wire is inserted into the metal puncture needle. Then, after placing the guide wire at the target site, the metal puncture needle is removed. At this time, a puncture needle with a plastic cannula can be used instead of the metal puncture needle. In this case, after the puncture needle with a plastic cannula is punctured to the target site, the inner needle is removed. Following this, a guide wire is inserted into the cannula, the guide wire is placed at the target site, and then the cannula is removed.

  Thus, after the guide wire is indwelled, a small incision is made in the insertion site as necessary, and then a dilator is inserted along the guide wire to expand the insertion site. Subsequently, after removing the dilator, the drain catheter is placed at the target site along the guide wire. Then, by operating the suction device, drainage or gas generated in the chest cavity of the patient or the like is removed via the drain catheter. In this case, the drainage is sucked from the slits 33 a and 33 b, the tip opening 36, and the side hole 37. Then, it passes through the drain catheter and is sucked into the storage container of the suction device.

<3. Features>
As described above, according to the present embodiment, since the distal end portion of the catheter is curved, it is possible to prevent perforations from being formed by the distal end of the soft tissue being pierced. In addition, a plurality of flow paths are formed in the liquid collection unit 3, and slits 33a and 33b and a distal end opening 36 that are open to the outside are formed in each of these flow paths, so that one opening sucks soft tissue. Even if it is blocked by this, suction from other openings is possible, so that drainage failure and exhaust failure can be prevented. In particular, since the slits 33 a and 33 b are formed in the straight portion 31, the shape of the opening is less likely to change than when the slits 33 a and 33 b are formed in the curved portion 32. That is, for example, when an opening extending in the longitudinal direction is formed in the bending portion 32, the opening is easily deformed when an external force that changes the diameter of the bending portion 32 is applied, but the straight portion 31 has slits 33a, When 33b is formed, deformation due to an external force can be prevented, so that stable suction is possible.

  Moreover, since the partition 34a, 34b, 34c which partitions each flow path 35a, 35b, 35c is formed in the liquid collection part 3, the external shape of the liquid collection part 3 can be reinforced from the inside. Therefore, it is possible to prevent kinking when the drain catheter is bent.

  Furthermore, since a plurality of side holes 37 are formed on the inner surface of the curved portion 32 facing the proximal end portion, liquid collection is possible from here. In particular, these side holes 37 are formed on the inner surface of the curved portion 32 and are difficult to be directly adsorbed to tissues in the body, so that stable liquid collection is possible. More specifically, a side hole can be formed in the circumferential region of the bending portion 32 as shown in FIG. 6 is a cross-sectional view taken along the line DD of FIG. As shown in the figure, the side hole 37 can be formed in a range α of about 270 ° (135 ° on both sides of the line T) across the line T passing through the center of the inner surface of the curved portion 32. This range α corresponds to the inner surface side of the present invention. However, in order to suppress the adsorption to the tissue, this range is preferably within 180 °, and more preferably within 120 °. Note that all the side holes 37 do not have to be formed within the above-described range 270 °, and it is sufficient that at least one of the side holes 37 is within this range.

  Moreover, these side holes 37 should just be substantially circular, and may be elliptical. Although the side hole 37 can be formed in a slit shape, it is preferable that the side hole 37 is generally circular because it is easily deformed when the curved portion 32 is deformed. By doing so, more stable liquid collection Is possible.

  Similarly, since the slits 33a and 33b formed in the straight portion 31 are also formed on the inner surface facing the distal end portion of the curved portion 32, it is difficult to directly adsorb to tissue in the body, and a stable liquid collection is possible. Is possible. Further, the circumferential range in which such slits are formed is also the same range α as that of the side hole 37 described above, that is, the slits 33a and 33b are located at the center of the inner surface of the bending portion 32 as shown in FIG. It can be formed in a range α of about 270 ° (135 ° on both sides of the line T) across the line T passing through. This range α corresponds to the inner surface side of the present invention. However, in order to suppress the adsorption to the tissue, this range is preferably within 180 °, and more preferably within 120 °. Note that all the slits 33 do not need to be formed within the above-described range 留 of about 270 °, and at least one of them may be within this range.

<4. Modification>
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various deformation | transformation is possible unless it deviates from the meaning. For example, the drain catheter may be formed by molding the respective portions along the longitudinal direction and then joining them, or may be formed by integral molding.

  The configuration of the bending portion 32 is not particularly limited as long as at least a portion is bent. Or as shown in FIG. 7, the whole may be curving in the shape of a spiral.

  In the above embodiment, the first and second flow paths 35 a and 35 b terminate in the straight portion 31, but may be configured to communicate with the internal space 30 of the bending portion 32. In this way, for example, when the third flow path 35c is closed, the liquid can be drained from the tip opening 36 via the first and second flow paths 35a and 35b.

  Moreover, in the said embodiment, although the straight part 31 is arrange | positioned between the curved part 32 and the drainage part 2 in the liquid collection part 3, the position of the straight part 31 is not specifically limited. For example, as shown in FIG. 8, the straight portion 31 may be provided on the tip side of the bending portion 32. In this case, the bending portion 32 is directly connected to the drainage portion 2. The straight portion 31 has a plurality of flow passages 35a, 35b, and 35c as described above, and the flow passage branches into three from the curved portion 32 to the straight portion 31, one of which is the tip opening 34. It extends to. The remaining two flow paths have slits 33 formed on the peripheral surface and terminate at the tip of the straight portion 31.

  Alternatively, as shown in FIG. 9, two straight portions 31 a and 31 b can be provided in the liquid collection portion 3. In this example, straight portions 31a and 31b are provided on the distal end side and the proximal end side of the bending portion 32, respectively. In this case, the number of slits is increased, so that more effective liquid absorption is possible.

  Moreover, in the said embodiment, although the partition part 34a, 34b, 34c is formed in the straight part 31, and the several flow paths 35a, 35b, 35c are formed, the partition for forming a several flow path is a straight part. Not only 31 but also the curved portion 32 can be formed. In the liquid collection part 3, a region where such a partition wall is formed is a branch region of the present invention. In this case, the above-described side holes and slits can be formed in the curved portion 32 where the partition walls are formed, and the circumferential range in which these are formed is as described above. Furthermore, although the liquid collection part 3 is formed by connecting the curved part 32 and the straight part 31, the liquid collection part 3 can also be comprised only by the curved part 32. FIG.

  In the above embodiment, the circular side hole 37 is formed on the inner surface of the curved portion 32, but a slit-like side hole can also be provided. However, the side holes are not necessarily required and may not be provided.

  Furthermore, the number of flow paths formed in the branch region is not particularly limited, and may be 2 or 4 or more by changing the number of partition walls. The number of slits communicating with each of the flow paths 35a and 35b may not be one, and a plurality of slits may be formed for one flow path. Moreover, the peripheral surface opening formed in the straight part 31 does not need to be slit-like, for example, a plurality of small holes are arranged in the axial direction, or formed by one opening such as a circle or a rectangle. You can also. Furthermore, an opening can be formed at a position corresponding to the third flow path 35a on the outer peripheral surface of the drain catheter. That is, at least one slit 33a, 33b formed in the first and second flow paths 35a, 35b and other openings (circular, rectangular, elliptical, etc.) can be formed.

  Moreover, the shape of the internal space of the liquid collection part 3 and the drainage part 2 does not necessarily need to be circular, and may be irregular as shown in FIG. In this example, a plurality of recesses 41 are formed on the inner wall surface of the internal space in cross-sectional view (three in this example), and these recesses 41 are formed to extend in the axial direction. If it does in this way, while securing the internal-diameter cross-sectional area which affects a flow volume, one part becomes thick and it can prevent the kink when a drainage part is bent.

  In the above embodiment, the drainage part 2 is formed to be transparent and the liquid collection part 3 is formed to be transparent or white. However, the present invention is not limited to this, and the color of each part can be changed as appropriate. it can.

2 Drainage part 3 Liquid collection part 31 Straight part 32 Curved part 33a, 33b Slit (peripheral surface opening)
35a First channel (sub-channel)
35b Second channel (sub-channel)
35c 3rd flow path (main flow path)
36 Tip opening

Claims (5)

A cylindrical drainage section;
A cylindrical liquid collection part connected to the distal end side of the drainage part and extending linearly, and a cylindrical liquid collection part connected to the distal end side of the straight part and having a curved part at least partially curved;
With
The straight portion has a branch region provided with at least one partition wall for forming a plurality of flow paths in at least a part of the axial direction;
The internal space of the branch region of the straight part is partitioned by the partition into at least one main flow path extending over the entire length of the straight part , and at least one sub flow path,
The main flow path and the sub flow path communicate with the internal space of the drainage part,
The sub- flow channel is formed on the outer peripheral surface of the branch region and opens to the outside through a slit-shaped peripheral surface opening extending along the axial direction of the straight portion .
The axial front end portion of the main channel communicates with the internal space of the bending portion,
The bending portion opens to the outside through a tip opening formed at the tip,
A drain catheter in which a circular side hole communicating with the internal space of the bending portion is formed on the inner surface side having a small radius of curvature on the outer peripheral surface of the bending portion . The drain catheter according to claim 1, wherein a distal end portion in the axial direction of the sub-flow channel is not in communication with the internal space of the bending portion and is not open to the outside. The drain catheter according to claim 1 or 2 , wherein the straight portion is further arranged on a distal end side than the curved portion. The drain catheter according to any one of claims 1 to 3, wherein the peripheral surface opening is formed on an inner surface facing the distal end portion of the curved portion. The drain catheter according to any one of claims 1 to 4 , wherein two auxiliary channels are provided.

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