JP2010259570A - Catheter set and method for producing catheter set - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a catheter set that improves insertion property of a catheter and also to provide a method for producing the catheter set. <P>SOLUTION: The catheter set A comprises a catheter 10 having a blood removing lumen and a blood supplying lumen, stylets 20 and 25, and an insertion resistance reducing member. A groove is formed on the outer circumference of the stylet 20. The insertion resistance reducing member comprises an elongated section 24a inserted into the groove of the stylet 20 and a coil-like covering section connected to the distal end of the elongated section and covering the distal ends of the stylets 20 and 25 to make the level difference between the distal end of the catheter 10 and the stylets 20 and 25 small. When the covering section is extended, the covering section can pass through the blood removing lumen. An insertion hole is formed in the stylet 25 for passing a guide wire 28. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a catheter set capable of improving the insertion property of a catheter and a method for manufacturing the catheter set.

  Conventionally, when hemodialysis is performed, the distal end of a dialysis catheter having a blood removal lumen and a blood delivery lumen is placed in a patient's blood vessel to remove blood flowing through the blood vessel. Extracting the blood from the lumen and purifying it is performed to return the blood from the blood-feeding lumen into the blood vessel (see, for example, Patent Document 1). The catheter (triple lumen catheter) includes a first lumen and a second lumen formed with a septum therebetween, and the distal end opening of the second lumen is the base portion than the distal end opening of the first lumen. 1-11 cm apart on the side. Further, a side hole is formed in the side portion of the tip side portion of the first lumen, and a third lumen having a tip extending toward the side hole is provided inside the partition wall.

  The first lumen is used as a blood return (blood transmission) lumen, and the second lumen is used as a blood removal lumen. When the distal end portion of the catheter is placed in the patient's blood vessel, first, the distal end portion of the guide wire is inserted into the blood vessel, and the stylet is inserted into the first lumen. Next, the catheter and the stylet are inserted into the body while inserting the guide wire into the stylet from the rear side, so that the distal end portion of the catheter is inserted into the blood vessel and placed. Next, the stylet is removed from the catheter, and the guide wire is further removed from the catheter. Thereby, the operation for indwelling the catheter is completed, and then hemodialysis is started.

JP 2006-346183 A

  However, when the above-described catheter is inserted into the patient's body, the stylet is inserted into the first lumen while the distal end opening of the second lumen remains open. A plane perpendicular to the axial direction is formed. For this reason, there is a problem that the distal end openings of the first lumen and the second lumen become resistances, respectively, and the insertion resistance of the catheter is increased, resulting in poor operability.

  This invention is made | formed in view of such a situation, The objective is to provide the manufacturing method of the catheter set which can improve the insertion property of a catheter, and a catheter set.

  In order to achieve the above-described object, the structural features of the catheter set according to the present invention include a catheter having a pair of lumens, and a pair of lumens of the catheter in a state where the distal end portion protrudes from the distal end opening of the catheter. A pair of stylets each having a flexibility inserted therein, and a flexible insertion resistance reducing member capable of covering the distal ends of the pair of stylets, A through passage that extends along the axial direction of one stylet can be formed in the outer periphery or inside of one of the stylets, and the insertion resistance reducing member can be inserted into the through passage of one stylet. Coil shape that reduces the step between the distal end of the catheter and the pair of stylets by covering the distal end of the pair of stylets connected to the distal ends of the long portions and the long portions When the elongated part is pulled to the proximal end of the catheter from the state where the elongated part is inserted into the lumen of the catheter with the sheath part positioned on the distal end side of the catheter, the covering part extends. Thus, the lumen of the catheter can be inserted.

  The catheter set according to the present invention includes a catheter having a pair of lumens, a pair of stylets, and an insertion resistance reducing member. A through passage extending along the axial direction is formed in the outer periphery or inside of one of the pair of stylets, and the insertion resistance reducing member can be inserted into the through passage of the one stylet. It is comprised by the linear member which has the flexibility which consists of a elongate part and the coil-shaped coating | coated part which can cover the front-end | tip part of a pair of stylet.

  For this reason, a pair of stylets are respectively inserted into a pair of lumens of the catheter so that the distal ends thereof protrude from the distal end portion of the catheter, and further, the long portion of the insertion resistance reducing member is inserted into the through passage of one stylet. The step between the tip of the catheter and the pair of stylets can be reduced by inserting and covering the tip of the pair of stylets protruding from the tip of the catheter. As described above, the step between the distal end of the catheter and the pair of stylets is reduced, so that the insertion property of the catheter is improved. That is, the pair of stylets enhances the waist of the catheter and improves the operability of the catheter, and the insertion resistance reducing member decreases the insertion resistance of the catheter and improves the insertability.

  In this case, as the insertion resistance reducing member, it is preferable to use a thin wire rod made of a resin material having a circular cross-sectional shape, and at least the distal end of the catheter protrudes at the covering portion of the insertion resistance reducing member thus configured. Covering the outer periphery of the catheter side portion of the pair of stylets. Thereby, a smooth outer peripheral surface can be formed on the distal end side of the catheter. In addition, since the insertion resistance reducing member is flexible, when the insertion resistance reducing member is removed from the catheter after the catheter is placed in the patient's body, the elongated portion is placed on the proximal side of the catheter. By pulling on, the covering portion can be sequentially extended and extracted together with the long portion.

  In addition, when forming a penetration path in one stylet, the front end side opening of a penetration path is located in the outer peripheral surface a little more proximal than the front-end | tip of one stylet. Thereby, it becomes easy to coat | cover the front-end | tip part of a pair of stylet with a coating | coated part. Further, when the covering portion is extended, each lumen can be inserted, but it is more preferable that the inside of the through passage is inserted as well as the lumen. According to this, before the one stylet is extracted from the catheter, the insertion resistance reducing member can be extracted from the one stylet.

  Further, another structural feature of the catheter set according to the present invention is that an insertion hole for passing a guide wire is formed along the longitudinal direction of the other stylet in the other stylet of the pair of stylets. It is to have done. According to this, when inserting the catheter into the patient's body, the catheter can be inserted along the guide wire whose tip is inserted into the patient's body, so the catheter can be easily inserted into the patient's body. Become.

  Still another structural feature of the catheter set according to the present invention is that the pair of lumens are a blood removal lumen and a blood delivery lumen, and the catheter is a hemodialysis catheter. . According to this, it is possible to obtain a catheter set for hemodialysis that facilitates an operation for placing the catheter in a blood vessel of a patient.

  In addition, the structural features of the method for manufacturing a catheter set according to the present invention include a catheter having a pair of lumens, a pair of stylets having flexibility inserted into the lumens of the catheter, and a pair A flexible insertion resistance reducing member capable of covering the tip of the stylet, and the axial direction of the one stylet on the outer periphery or the inside of one of the pair of stylets A method of manufacturing a catheter set in which a through passage extending along the path is formed, with the pair of stylets projecting from the distal end of the catheter in a state where the pair of stylets protrudes from the distal end of the catheter, respectively. The stylet insertion step to be inserted and the insertion resistance reducing member are composed of a long portion and a coil-shaped covering portion connected to the tip of the long portion, and the long portion is one stylet. Covering step of reducing the step between the distal end of the catheter and the pair of stylets by inserting the sheath from the distal end side of the catheter into the through passage and covering the distal end portion of the pair of stylets protruding from the distal end of the catheter When the covering part is positioned on the distal end side of the catheter and the long part is inserted into the lumen of the catheter, the covering part is extended by pulling the long part to the proximal end side of the catheter. This is because the portion can be inserted through the lumen of the catheter.

  According to the present invention, a catheter set can be obtained in which the waist of the catheter is strengthened by the pair of stylets to improve the operability of the catheter, and the insertion resistance of the catheter can be reduced by the insertion resistance reducing member.

  Another structural feature of the method for manufacturing a catheter set according to the present invention is that, in the other stylet of the pair of stylets, an insertion hole for passing a guide wire is provided along the longitudinal direction of the other stylet. It is in forming. According to this, the catheter set which can insert a catheter into a patient's body using a pair of stylet, an insertion resistance reduction member, and a guide wire can be obtained.

  The present invention also comprises a catheter having a pair of lumens, a pair of stylets inserted into the lumens of the catheter, and an insertion resistance reducing member, and one of the pair of stylets A through passage extending along the axial direction of the one stylet is formed in the outer peripheral portion or inside of the stylet, and the insertion resistance reducing member has a long portion through which the through passage can be inserted, and the long portion An insertion method for inserting a catheter set into a blood vessel of a human body from the distal end side, wherein the catheter set is configured by a coiled covering portion connected to the distal ends and capable of covering the distal end portions of the pair of stylets. A step of pulling the pair of stylets toward the proximal end of the catheter to remove the stylet from the catheter; and pulling the insertion resistance reducing member backward. Stretched and may be a method of using a catheter set provided with the insertion resistance reducing member sampling step of withdrawing is passed through the lumen of the catheter while extending the cover portion.

  In this case, an insertion hole for passing a guide wire is formed in the other stylet of the pair of stylets along the longitudinal direction of the other stylet, and the catheter set is inserted into a blood vessel of the human body. At this time, the insertion property of the catheter can be further improved by inserting the catheter set along the guide wire with the distal end portion inserted into the blood vessel.

It is the perspective view which showed the catheter set which concerns on one Embodiment of this invention. The catheter with which a catheter set is shown is shown, (a) is a top view, (b) is the front view which showed the front-end | tip of the catheter shown to (a), (c) is a side view. The one stylet with which a catheter set is shown is shown, (a) is a side view, (b) is a front view. It is the side view which showed the insertion resistance reduction member with which a catheter set is provided. The other stylet with which a catheter set is shown is shown, (a) is a side view, (b) is a front view. The tip part of a catheter to which a pair of stylets and an insertion resistance reducing member is attached is shown, (a) is a partial cross-sectional view showing the inside of the catheter, (b) is a cross-sectional view taken along line bb of (a). It is.

  Hereinafter, an embodiment of a catheter set and a method for manufacturing a catheter set according to the present invention will be described in detail with reference to the drawings. FIG. 1 shows a catheter set A according to the embodiment. The catheter set A is used for hemodialysis, and includes a catheter 10 placed in a patient's blood vessel and a pair of stylets 20 (see FIG. 3) and 25 (see FIG. 5) inserted into the catheter 10. ), An insertion resistance reducing member 24 (see FIG. 4), and a guide wire 28. As shown in FIG. 2, the catheter 10 is branched from an elongated catheter body 11 and a connection portion 12 connected to a proximal end portion (left end portion of FIGS. 2A and 2C) of the catheter body 11. It is comprised with the branch pipes 13 and 14 of a book.

  The catheter body 11 is formed of an elongated flexible cylindrical body, and a blood removal lumen 11a and a blood feeding lumen 11b are formed inside the catheter body 11 with a partition wall 11c that bisects the inside of the catheter body 11 interposed therebetween. Has been. Further, a notch 15a located on the blood removal lumen 11a side and a notch 15b located on the blood delivery lumen 11b side are 180 degrees around the axis of the catheter body 11 at the distal end of the catheter body 11. It is formed with an interval of. The notch 15a extends straight from the distal end of one end in the width direction of the partition wall 11c (the left end portion in FIG. 2B) to the base end side along the longitudinal direction of the partition wall 11c, and then the width of the partition wall 11c. It is comprised by the recessed part provided with the substantially V-shaped edge part extended diagonally toward the other edge part front end side (right end part side of FIG.2 (b)) of a direction.

  The obliquely extending edge of the notch 15a is notched so as to be orthogonal to the axis of the catheter body 11 before the tip of the other end of the partition wall 11c, and continues to the other end of the partition wall 11c. The notch 15b extends straight from the distal end of the other end in the width direction of the partition wall 11c to the base end side along the longitudinal direction of the partition wall 11c, and then the distal end side of one end in the width direction of the partition wall 11c. It is comprised by the recessed part provided with the substantially V-shaped edge part extended diagonally. The obliquely extending edge of the notch 15b is notched so as to be orthogonal to the axis of the catheter body 11 before the end of one end of the septum 11c, and continues to one end of the septum 11c.

  That is, the notch 15 b is formed so as to overlap the notch 15 a when rotated 180 degrees around the axis of the catheter body 11, and the distal end of the partition wall 11 c slightly protrudes from the distal end of the outer peripheral portion of the catheter body 11. . A rhomboid side hole 16 (only one of them is shown) is formed on the proximal end side slightly from the notches 15a and 15b in the catheter body 11 with an interval of 180 degrees around the axis of the catheter body 11. . Further, inside the connecting portion 12, a lumen communicating with the blood removal lumen 11a and a lumen communicating with the blood feeding lumen 11b are formed.

  The branch tube 13 is formed of a cylindrical body having a lumen communicating with the blood removal lumen 11a through one lumen of the connection portion 12, and a luer adapter 13a is connected to the proximal end portion thereof. Has been. Further, the branch pipe 14 is formed of a cylindrical body having a lumen communicating with the blood feeding lumen 11b through the other lumen of the connecting portion 12, and a luer adapter 14a is provided at a base end portion thereof. Are connected. A screw 13b is formed on the outer periphery of the opening side end portion of the luer adapter 13a, and a screw 14b is formed on the outer periphery of the opening side end portion of the lure adapter 14a. The catheter body 11 and the branch pipes 13 and 14 are made of a soft synthetic resin material such as silicone and polyurethane, and the connection portion 12 and the luer adapters 13a and 14a are made of a synthetic resin material such as polypropylene, polyurethane and polycarbonate. ing.

  In addition, clamps 17 for closing the lumens of the branch pipes 13 and 14 are attached to the branch pipes 13 and 14, respectively. The clamp 17 is formed by forming a substantially triangular frame having elasticity by bending an elongated plate-like body, and forming an engagement recess (not shown) including a step portion on the inner surface of one end side portion. In addition, an engaging projection 17a that can engage with the engaging recess is formed at the other end. Further, holes 17b and 17c for inserting the branch pipes 13 and 14 are formed before and after the clamp 17, respectively. The branch pipes 13 and 14 are inserted into the holes 17b and 17c so that the clamp 17 is connected to the branch pipe. 13 and 14, respectively.

  Furthermore, when the engaging protrusion 17a is engaged with the engaging recess, the opposing portion on the inner peripheral surface of the clamp 17 is pressed to press the branch pipes 13 and 14 from both sides to close the lumen. Portions 17d and 17e are formed. Therefore, the branch pipes 13 and 14 are closed by engaging the engagement protrusion 17a with the engagement recess, and the engagement between the engagement protrusion 17a and the engagement recess is released. Both ends can be communicated with each other. The clamp 17 is made of a synthetic resin material such as polypropylene or ABS.

  The stylet 20 constitutes one stylet according to the present invention. As shown in FIG. 3, the stylet 20 includes a stylet main body 21 and a grip portion 22 provided at the base end of the stylet main body 21. Has been. The stylet body 21 is composed of an elongated wire made of a synthetic resin material that can be inserted into the blood removal lumen 11a and the blood feeding lumen 11b of the catheter 10. The cross-sectional shape of the stylet body 21 is shown in FIG. 3 (b) (FIG. 3 (b) shows a state viewed from the tip side, but the cross-sectional shape is the same as this). Thus, it is formed in a substantially semicircular shape, and a groove portion 21a as a through passage according to the present invention is formed in the center of the arc-shaped outer peripheral portion in the substantially semicircular shape. The groove 21 a is formed along the longitudinal direction of the stylet body 21.

  Further, the gripping portion 22 is rotatable in the direction around the axis on the outer peripheral side of the gripping portion main body 22a connected to the base end portion of the stylet main body 21 and the connecting portion of the gripping portion main body 22a with the stylet main body 21. And a cylindrical screw portion 22b attached to the gripping portion main body 22a. Screws (not shown) that can be screwed onto the screws 13b of the luer adapter 13a and the screws 14b of the luer adapter 14a are formed on the inner peripheral surface of the cylindrical screw portion 22b.

  The insertion resistance reducing member 24 includes a long portion 24a that can be inserted through the groove portion 21a of the stylet main body 21, and a coil-shaped covering portion 24b that is formed at the tip of the long portion 24a. The outer diameter of the covering portion 24b is substantially equal to the outer diameter of the catheter body 11, and the inner diameter of the covering portion 24b is the same as the diameter of the stylet main body 21 (the length of the straight portion shown in FIG. 3B). It is almost equal. Moreover, the coating | coated part 24b can be expanded-contracted, and when it shrink | contracts, it will become a substantially cylindrical shape. Further, it is extended by pulling, and in the extended state, it can be inserted through the blood removal lumen 11a and the blood supply lumen 11b of the catheter body 11. The insertion resistance reducing member 24 is made of a resin material such as nylon, polyethylene, or polyester.

  The stylet 20 is assembled to the stylet body 21 with a long portion 24 a inserted in the groove portion 21 a of the stylet body 21 and the outer periphery of the stylet body 21 covered with a covering portion 24 b. The stylet body 21 is used for blood removal of the catheter 10 in a state where the distal end portion of the stylet body 21 and the covering portion 24b are exposed to the outside from the outer peripheral side of the blood removal lumen 11a or the blood feeding lumen 11b. It can be inserted into the lumen 11a or the blood supply lumen 11b. Further, the stylet 20 can be fixed to the catheter 10 by screwing the screw of the cylindrical screw portion 22b into the screw 13b or the screw 14b.

  The stylet 25 constitutes the other stylet according to the present invention, and comprises a stylet body 26 and a gripping portion 27 as shown in FIG. The stylet body 26 is composed of an elongated wire made of a synthetic resin material that can be inserted into the blood removal lumen 11a and the blood feeding lumen 11b of the catheter 10, and the edge of the cross-sectional shape is formed in a semicircular shape. A guide wire insertion hole 26a that penetrates the stylet body 26 in the longitudinal direction is formed inside. In addition, the gripper 27 is configured to be rotatable in the direction around the axis on the outer peripheral side of the gripper body 27a connected to the stylet body 26 and the connection between the stylet body 26 in the gripper body 27a. It is comprised with the cylindrical thread part 27b attached to 27a.

  The grip portion main body 27a is formed in a cylindrical shape having an insertion hole (not shown) that communicates with the guide wire insertion hole 26a of the stylet main body 26, and the guide wire 28 extends from the insertion hole to the guide wire insertion hole 26a. Can pass through. Further, a screw (not shown) that can be screwed to the screw 13b of the luer adapter 13a and the screw 14b of the luer adapter 14a is formed on the inner peripheral surface of the cylindrical screw portion 27b. For this reason, the stylet body 26 is inserted into the blood removal lumen 11a or the blood feeding lumen 11b of the catheter 10, and the screw of the cylindrical screw portion 27b is screwed into the screw 13b or the screw 14b. 25 can be fixed to the catheter 10. Further, the tip portions of the stylet main body 21 and the stylet main body 26 taper so as to form sharpened portions when protruding from the tip ends of the blood removal lumen 11a and the blood feeding lumen 11b, respectively. It is in the shape.

  The guide wire 28 is used to guide the catheter 10 by being inserted into a predetermined portion in the blood vessel of the patient in advance, and is made of stainless steel having an outer diameter of 0.5 to 1.0 mm. When the guide wire 28 is inserted into the blood vessel, first, a cannula (not shown) made of a cylindrical puncture needle is punctured into the patient's body, and the tip thereof reaches the blood vessel. Next, the guide wire 28 is passed through the cannula, and the distal end portion of the guide wire 28 is inserted into the blood vessel. Then, with the guide wire 28 left on the patient's body, the cannula is pulled out from the patient's body, and the catheter 10 is placed by an operation described later using the guide wire 28.

  In this configuration, when hemodialysis is performed using the catheter set A, first, an operation of attaching the stylets 20 and 25 and the insertion resistance reducing member 24 to the catheter 10 is performed in the manufacturing process. In this case, as shown in FIG. 2A, for example, the stylet 20 is opened from the opening of the luer adapter 13a of the branch tube 13 in the catheter 10 to which the clamps 17 in the loosened state are attached to the branch tubes 13 and 14, respectively. Is inserted from the tip side. Then, the stylet body 21 is positioned in the blood removal lumen 11a, and the distal end of the stylet body 21 protrudes from the distal end of the catheter body 11. At this time, the curved surface side of the outer peripheral surface of the stylet main body 21 faces the curved surface side of the inner peripheral surface of the blood removal lumen 11a, and the flat surface side of the outer peripheral surface of the stylet main body 21 is the inner peripheral surface of the blood removal lumen 11a. It faces the plane side.

  Next, the elongated portion 24 a of the insertion resistance reducing member 24 is inserted from the proximal end side into the groove portion 21 a of the stylet body 21 protruding from the distal end of the catheter body 11. And the base end side part of the long part 24a is protruded outside from the opening of the luer adapter 13a, and the part other than the base end side part in the long part 24a is surrounded by the groove part 21a and the inner peripheral surface of the catheter body 11. It is located in the part. At this time, the elongate portion 24a is accommodated in a portion surrounded by the groove portion 21a and the inner peripheral surface of the catheter body 11 in a state where it can be inserted in the longitudinal direction but is not rattling, and the covering portion 24b is Located on the distal end side of the stylet body 21.

  Next, the stylet 25 is inserted from the distal end side through the opening of the luer adapter 14 a of the branch tube 14, the stylet body 26 is positioned in the blood feeding lumen 11 b, and the distal end portion is the distal end of the catheter body 11. Protrude from. At this time, the curved surface side of the outer peripheral surface of the stylet body 26 faces the curved surface side of the inner peripheral surface of the blood sending lumen 11b, and the flat surface side of the outer peripheral surface of the stylet body 26 is the inner peripheral surface of the blood feeding lumen 11b. It faces the plane side. Next, the cylindrical screw portion 27b is screwed into the screw 14b of the luer adapter 14a. As a result, the stylet 25 is fixed to the catheter 10. At this time, the distal end portion of the stylet body 26 is located at substantially the same position as the distal end portion of the stylet body 21 in the direction protruding from the catheter body 11.

  Next, while covering the distal end portions of the stylet bodies 21 and 26 with the covering portion 24b, the proximal end portion of the elongated portion 24a is pulled, and the proximal end portion of the covering portion 24b is brought to the opening side end surface of the catheter body 11. While making it contact | abut, let the elongate part 24a be in a state without a slack. Then, the cylindrical screw portion 22b is screwed into the screw 13b of the luer adapter 13a. As a result, the stylet 20 is fixed to the catheter 10. At this time, the distal end portion of the catheter body 11 is as shown in FIG. In this state, the stepped portion between the distal end portion of the catheter body 11 and the stylet bodies 21 and 26 is covered with the covering portion 24b to form a relatively smooth surface. The cylindrical screw portion 22b is formed with an insertion hole through which the insertion resistance reducing member 24 is inserted, and a proximal end portion of the insertion resistance reducing member 24 extends to the outside through the insertion hole.

  In this way, the catheter 10 in which the stylets 20 and 25 are attached and the tips of the stylet bodies 21 and 26 are covered with the covering portion 24b is the guide wire having the tip portion inserted into the blood vessel as described above. 28 is used to indwell in the blood vessel. In this case, the end portion of the guide wire 28 extending from the body of the patient is inserted into the inside of the opening of the guide wire insertion hole 26 a in the stylet body 26, and the end portion is protruded to the outside from the opening of the grip portion 27. Then, the catheter 10 is inserted into the patient's body along with the stylets 20 and 25 and the insertion resistance reducing member 24 along the guide wire 28.

  When the distal end portion of the catheter 10 reaches the blood vessel, the screwing of the cylindrical screw portion 22b and the screw 13b of the luer adapter 13a is released, and the screwing of the cylindrical screw portion 27b and the screw 14b of the luer adapter 14a is released. Then, the guide wire 28, the stylet 25, and the stylet 20 are sequentially pulled out from the catheter 10. Furthermore, by pulling out the proximal end portion of the long portion 24a and pulling out the covering portion 24b in the blood removal lumen 11a, only the catheter 10 can be left on the patient's body. Next, the blood removal side of the dialysis circuit for sucking blood is connected to the luer adapter 13a of the branch tube 13, and the dialysis circuit for returning the purified blood to the blood vessel in the body is connected to the luer adapter 14a of the branch tube 14. Connect the blood side.

  Then, hemodialysis is performed by operating the dialysis apparatus connected to the dialysis circuit. In this case, blood in the blood vessel is extracted from the blood removal lumen 11a and purified by a dialysis device, and then returned to the blood vessel from the blood supply lumen 11b. At this time, a part of the blood to be removed passes through the side hole 16 provided on the blood removal lumen 11 a side of the catheter body 11, and a part of the blood to be sent is sent from the catheter body 11. It passes through a side hole 16 provided on the blood lumen 11b side.

  As described above, the catheter set A according to this embodiment includes the catheter 10 including the blood removal lumen 11a and the blood delivery lumen 11b, the pair of stylets 20 and 25, the insertion resistance reducing member 24, and the like. It has. A groove 21 a extending along the axial direction is formed on the outer periphery of the stylet 20, and the insertion resistance reducing member 24 includes a long portion 24 a that can be inserted into the groove 21 a of the stylet 20, It is comprised with the coating | coated part 24b which can cover the front-end | tip part of 25. Therefore, the stylets 20 and 25 are inserted into the blood removal lumen 11a and the blood delivery lumen 11b of the catheter 10, respectively, and the long portion 24a is inserted into the groove portion 21a of the stylet 20, so that the catheter 10 The step between the distal end of the catheter 10 and the stylet 20, 25 can be eliminated or reduced by covering the distal end portion of the stylet 20, 25 protruding from the distal end of the catheter with the covering portion 24b.

  Thus, the step of the distal end of the catheter 10 is eliminated or reduced, so that the insertion property of the catheter 10 is improved. In addition, since the insertion resistance reducing member 24 is flexible, when the insertion resistance reducing member 24 is extracted from the catheter 10 after the catheter 10 is placed in the patient's body, the elongated portion 24a is used. By pulling, the covering portion 24b can be sequentially extended and extracted together with the long portion 24a. In addition, since the guide wire insertion hole 26a for allowing the guide wire 28 to pass through is formed in the stylet 25, the catheter 10 can be inserted into the patient's body using the guide wire 28. The detention operation can be performed more smoothly.

  The catheter set according to the present invention is not limited to the embodiment described above, and can be implemented with appropriate modifications. For example, in the above-described embodiment, the through passage is configured by the groove portion 21 a formed in the outer peripheral portion of the stylet 20, but the through passage may be formed in the stylet 20. In this case, the opening on the distal end side of the through passage is positioned on the outer peripheral surface slightly proximal to the distal end of the stylet 20. Accordingly, the step portion between the distal end portion of the catheter main body 11 and the stylets 20 and 25 can be easily covered with the covering portion 24b.

  In the above-described embodiment, the covering portion 24b can be inserted through the blood removal lumen 11a and the blood feeding lumen 11b. However, the coating portion 24b may be inserted through the groove portion 21a. In particular, as described above, when the through passage is formed inside the stylet 20, the covering portion 24b needs to be able to pass through the through passage. In this case, after the insertion resistance reducing member 24 is extracted from the catheter 10, an operation of extracting the stylets 20 and 25 is performed. Furthermore, the catheter is not limited to the catheter 10 described above, and various types of catheters can be used.

  DESCRIPTION OF SYMBOLS 10 ... Catheter, 11a ... Blood removal lumen, 11b ... Blood supply lumen, 20, 25 ... Stylet, 21a ... Groove, 24 ... Insertion resistance decreasing member, 24a ... Long part, 24b ... Covering part, 26a ... guide wire insertion hole, 28 ... guide wire, A ... catheter set.

Claims (5)

A pair of lumens having a pair of lumens; a pair of stylets having flexibility, each of which is inserted into a pair of lumens of the catheter in a state where a distal end portion protrudes from a distal end opening of the catheter; A catheter set comprising a flexible insertion resistance reducing member capable of covering the tip of the stylet,
Forming a through passage extending along the axial direction of the one stylet on the outer periphery or inside of one of the pair of stylets,
The insertion resistance reducing member is connected to the distal end of the pair of stylets connected to the distal end of the pair of stylets by connecting the distal end of the pair of stylets to the distal end of the catheter. A coil-shaped covering portion that reduces the step between the pair of stylets,
The covering portion expands when the elongate portion is pulled toward the proximal end of the catheter from a state where the covering portion is positioned on the distal end side of the catheter and the long portion is inserted into the lumen of the catheter. The catheter set can be inserted through the lumen of the catheter.   The catheter set according to claim 1, wherein an insertion hole for passing a guide wire is formed in the other stylet of the pair of stylets along the longitudinal direction of the other stylet.   The catheter set according to claim 1 or 2, wherein the pair of lumens are a blood removal lumen and a blood delivery lumen, and the catheter is a hemodialysis catheter. A catheter provided with a pair of lumens, a pair of stylets with flexibility inserted into the lumens of the catheters, and a flexibility capable of covering the tips of the pair of stylets Of the insertion resistance reducing member, and a catheter set in which a through passage extending along the axial direction of the one stylet is formed in the outer peripheral portion or inside of the one stylet of the pair of stylets A method,
A stylet insertion step of inserting the pair of stylets into the pair of lumens of the catheter, with the distal ends of the pair of stylets protruding from the distal end of the catheter;
The insertion resistance reducing member is composed of a long portion and a coil-shaped covering portion connected to the distal end of the long portion, and the long portion extends from the distal end side of the one stylet to the through passage. And a covering step of reducing the step between the distal end of the catheter and the pair of stylets by inserting and covering the distal end portions of the pair of stylets protruding from the distal end of the catheter. ,
When the covering portion is extended by pulling the long portion toward the proximal end of the catheter from a state where the covering portion is positioned on the distal end side of the catheter and the long portion is inserted into the lumen of the catheter. In addition, the method for manufacturing a catheter set is characterized in that the covering portion can be inserted through the lumen of the catheter.   The method of manufacturing a catheter set according to claim 4, wherein an insertion hole for passing a guide wire is formed in the other stylet of the pair of stylets along the longitudinal direction of the other stylet.

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