JP2019198662A - catheter - Google Patents

Abstract

To provide a catheter preventing an end tip single body from remaining in the body of a patient even when an end tip comes off a catheter body.SOLUTION: A catheter includes: a catheter body 11(111) having a lumen 16(116); a resin end tip 12(112) which has a lumen communicating with the lumen 16(116) of the catheter body 11(111) and is connected to an end of the catheter body 11(111); and a coil body 24 and/or a braid 124 arranged in the catheter body 11(111) and the end tip 12(112) along the lumen 16(116). In the catheter, the end tip 12(112) is provided with a reinforcing body 30(130) which covers the coil body 24 and/or braid 124.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a catheter used by being inserted into a tubular organ or body tissue of a human body such as a blood vessel, a digestive tract, and a ureter.

  2. Description of the Related Art Conventionally, a catheter having a braid composed of a plurality of metal strands is known as a type of catheter that is inserted into and used in a tubular organ or body tissue of a human body such as a blood vessel, a digestive tract, and a ureter. Yes. For example, in Cited Document 1, a catheter 100 including a tubular body 10, a distal tip 58 joined to the distal end of the tubular body 10, and a reinforcing wire 32 disposed inside the tubular body 10 and the distal tip 58. Is described (see FIG. 2 etc.).

  In this type of catheter, since the braid is disposed inside the tubular body 10 (hereinafter referred to as “catheter body”) and the tip tip 58, the rigidity of the catheter itself is increased and the lumen of the catheter may be crushed. Is prevented. Further, when the arranged braid is replaced with a coil body, torque transmission from the proximal end to the distal end of the catheter increases.

JP 2014-188337 A

However, in the conventional catheter, although the braid is disposed inside the catheter body and the distal tip, the distal tip may come off from the catheter body during the procedure, and the distal tip may remain in the patient's body. It was.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a catheter that prevents the tip tip alone from remaining in the patient's body even if the tip tip is detached from the catheter body. .

In order to achieve such an object, the first aspect of the present invention provides a catheter main body having a lumen, and a resin tip having a lumen communicating with the lumen of the catheter main body and connected to the distal end of the catheter main body. And a coil body and / or a braid arranged along the lumen on the catheter body and the tip, and the tip includes a reinforcing body covering the coil and / or the braid. Is provided.

The invention of the second aspect is characterized in that, in the invention of the first aspect, the reinforcing body has a diameter larger than the diameter of the coil body and / or the braid.

The invention of the third aspect is characterized in that, in the invention of the second aspect, the reinforcing body has a protrusion extending toward the outer periphery of the tip.

The invention of the fourth aspect is characterized in that, in any one of the inventions of the first aspect to the third aspect of the invention, the reinforcing body is made of a resin harder than a resin constituting the tip. And

The fifth aspect of the invention is the invention according to any one of the first aspect of the invention to the fourth aspect of the invention, wherein the reinforcing body is disposed across the catheter body and the distal tip. It is characterized by.

The invention of the sixth aspect is characterized in that, in the invention of the fifth aspect, the reinforcing body has a protrusion extending toward the outer periphery on each of the catheter body and the distal tip.

Further, the seventh aspect of the invention is the invention according to any one of the first aspect to the fifth aspect of the invention, wherein the reinforcing body is formed integrally with the catheter body. .

According to the first aspect of the invention, a catheter body having a lumen, a resin-made tip having a lumen communicating with the lumen of the catheter body, connected to the tip of the catheter body, and the catheter body and the tip In the catheter provided with the coil body and / or the braid arranged along the lumen, the distal tip is provided with a reinforcing body that covers the coil body and / or the braid. Even if the tip is detached, it is possible to prevent the distal tip alone from remaining in the patient's body.

According to the second aspect of the invention, since the reinforcing body has a diameter larger than the diameter of the coil body and / or the braid, in addition to the effect of the invention of the first aspect, the distal tip is detached from the catheter body. Even so, it is possible to further prevent the tip tip alone from remaining in the patient's body.

Further, according to the third aspect of the invention, since the reinforcing body has the protrusion extending toward the outer periphery of the distal tip, in addition to the effects of the second aspect of the invention, the distal tip is detached from the catheter body. However, it is possible to further prevent the tip tip alone from remaining in the patient's body.

According to the fourth aspect of the invention, since the reinforcing body is made of a resin harder than the resin constituting the tip, the effect of any one of the inventions of the first to third aspects is achieved. In addition, even if the distal tip is detached from the catheter body, the distal tip alone can be further prevented from remaining in the patient's body.

According to the fifth aspect of the invention, since the reinforcing body is disposed across the catheter body and the tip, the invention according to any one of the first aspect to the fourth aspect of the invention. In addition to the effect, it is possible to prevent the distal tip from coming off from the catheter body itself, and thus to prevent the distal tip alone from remaining in the patient's body.

According to the sixth aspect of the invention, since the reinforcing body has the protrusions extending toward the outer periphery on each of the catheter main body and the distal tip, in addition to the effects of the fifth aspect of the invention, the distal end The tip itself can be further prevented from being detached from the catheter body, and thus the tip end can be prevented from remaining in the patient's body.

Further, according to the seventh aspect of the invention, since the reinforcing body is formed integrally with the catheter body, in addition to the effect of any one of the inventions of the first aspect to the fifth aspect. Further, it is possible to further prevent the distal tip from coming off from the catheter body itself, and thus to prevent the distal tip alone from remaining in the patient's body.

  The present invention will be described below with reference to the drawings.

(First embodiment)
First, a first embodiment of the present invention will be described. FIG. 1 is an explanatory front view showing an embodiment of the catheter of the present invention, and FIG. 2 is a partial sectional view of the catheter in the first embodiment of the present invention.

In FIG. 1, a catheter 10 according to the present embodiment includes a catheter body 11, a flexible distal tip 12 connected to the distal end of the catheter body 11, and a connector 14 connected to the proximal end of the catheter body 11. ing.

More specifically, the catheter body 11 is constituted by a hollow long member having a lumen 16 into which a guide wire is inserted. In the present embodiment, the total length of the catheter body 11 is about 1500 mm. And the part from the front-end | tip of the catheter main body 11 to about 200 mm is the front-end | tip part 18 which has an outer diameter of about 0.88 mm (0.85-0.90 mm), From the base end of the front-end | tip part 18, it is about 600 mm. The portion is an intermediate portion 20 having an outer diameter slightly larger than that of the tip portion 18. Further, a portion from the base end of the intermediate portion 20 to the connector 14 is a base end portion 22 having a larger outer diameter than the intermediate portion 20.

As shown in FIG. 2, the catheter body 11 includes a hollow coil body 24, an inner resin layer 26 that covers the inner peripheral surface of the coil body 24, and an outer resin that covers the outer peripheral surface of the coil body 24. Layer 28.

The inner resin layer 26 has a tube shape extending over the entire length on the innermost side of the catheter body 11. The lumen 16 of the catheter body 11 is configured by the inner hole of the inner resin layer 26. The inner resin layer 26 extends from the distal end of the catheter body 11 toward the distal end in the axial direction.

In addition, the resin material for forming the inner resin layer 26 is not particularly limited, and a resin material that exhibits flexibility and appropriate flexibility is appropriately selected. Considering the slidability of the guide wire, for example, polytetrafluoroethylene (PTFE) having excellent lubricity is preferably used.

The coil body 24 is a hollow stranded coil obtained by twisting a plurality of metal strands 40 (10 in the present embodiment) having a circular cross section. Further, since the coil body 24 is heat-treated by a known method after the plurality of metal strands 40 are twisted, the residual stress of the coil body 24 is removed.

  The metal material which comprises the metal strand 40 of the coil body 24 is not specifically limited. For example, the coil body 24 may be configured using a metal material such as stainless steel or a superelastic alloy such as a Ni-Ti alloy, or the coil body may be configured by various combinations of these metal materials. .

The outer resin layer 28 constitutes the outermost layer of the catheter body 11, so that the outer peripheral surface of the metal wire 40 constituting the coil body 24 is not exposed to the outside from the outer surface of the catheter body 11. It extends over the entire length of the catheter body 11 while covering the outer peripheral surface of the body 24.

Further, the outer resin layer 28 is configured such that the thickness of the portion constituting the outermost layer of the intermediate portion 20 of the catheter body 11 is thicker than the thickness of the portion constituting the outermost layer of the distal end portion 18 of the catheter body 11, The thickness of the portion constituting the outermost layer of the proximal end portion 22 of the catheter body 11 is made thicker than the thickness of the portion constituting the outermost layer of the intermediate portion 20 of the catheter body 11.

Further, the hardness of the outer resin layer 28 at the distal end portion 18, the intermediate portion 20, and the proximal end portion 22 of the catheter body 11 is increased stepwise from the distal end portion 18 to the proximal end portion 22. Accordingly, the flexibility of the proximal end portion 22, the intermediate portion 20, and the distal end portion 18 of the catheter body 11 is increased stepwise from the proximal end portion 22 to the distal end portion 18.

The resin material for forming the outer resin layer 28 is not limited at all, and a resin material that exhibits flexibility and appropriate flexibility is appropriately selected. Examples of the material for forming the outer resin layer 28 include polyamide elastomer.

On the other hand, the distal tip 12 provided at the distal end of the catheter body 11 has an overall shape of an elongated cylindrical shape having a lumen communicating with the lumen 16 of the catheter body 11 and has sufficiently higher flexibility than the catheter body 11. Have. The tip 12 has a tapered outer peripheral surface that gradually decreases in diameter toward the most distal portion 48.

The resin material forming the tip chip 12 is not limited in any way, but a resin material that is more flexible than the resin material forming the inner resin layer 26 and the outer resin layer 28 is preferably used. An example of such a resin material is a polyurethane elastomer. In this embodiment, tungsten powder is mixed in the tip 12. Thereby, the visibility of the tip 12 under X-ray fluoroscopy is advantageously enhanced.

Further, the inner peripheral portion of the distal tip 12 is formed by an inner resin layer 26 extending from the distal end of the catheter body 11, and a coil body 24 continuous from the distal end of the catheter body 11 is provided inside the distal tip 12. It is wound around the outer periphery of the resin layer 26 and buried.

Further, a reinforcing body 30 made of a resin harder than the resin material of the tip chip 12 is provided in the tip chip 12 to prevent the tip chip 12 from being detached from the coil body 24. It is fixed to. As a result, even if the distal tip 12 is detached from the catheter body 11, the distal tip 12 is prevented from being detached from the coil body 24 by the reinforcing body 30 fixed to the distal tip 12 and the coil body 24. In this case, the distal tip 12 is prevented from being detached from the catheter body 11.

In the present embodiment, the reinforcing body 30 does not have a protrusion extending toward the outer periphery of the distal tip, which will be described later, but further prevents the distal tip 12 from being detached from the catheter body 11 in the axial direction of the catheter. Therefore, it may be formed so as to have a protrusion extending toward the outer periphery.

As a material of the reinforcing body 30, a polyamide elastomer can be exemplified, but in the present embodiment, a polyamide elastomer that is harder than the outer resin layer 28 is used.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. The catheter in the second embodiment shows an embodiment in which the coil body 24 of the catheter in the first embodiment is changed to a braided body 124. Further, the catheter in the second embodiment is the same in appearance as the catheter 10 in the first embodiment, so that the overall view is omitted and only the internal structure will be described using the drawings.

FIG. 3 is a partial cross-sectional view of a catheter according to the second embodiment of the present invention. In FIG. 3, the catheter main body 111 is comprised from the hollow elongate member which has the lumen | rumen 116 in which a guide wire is inserted. As shown in FIG. 3, the catheter body 111 includes a braided body 124, an inner resin layer 126 that covers the inner peripheral surface of the braided body 124, and an outer resin layer 128 that covers the outer peripheral surface of the braided body 124. Have.

The inner resin layer 126 has a tube shape extending over the entire length on the innermost side of the catheter main body 111. Further, the inner resin layer 126 extends from the distal end of the catheter body 111 toward the distal end side in the axial direction. In addition, the resin material which forms such an inner resin layer 126 can use the material similar to the inner side resin layer 26 of 1st Embodiment.

The braided body 124 has a structure in which two metal strands 140a and 140b are knitted alternately so as to have a mesh shape. The braided body 124 having such a mesh structure is wound around the outer peripheral surface of the inner resin layer 126 over the entire length.

Further, like the inner resin layer 126, the braided body 124 extends from the distal end of the catheter main body 111 in the distal axial direction, and is wound around the outer peripheral surface of the inner resin layer 126 extending from the distal end of the catheter main body 111. ing.

The type of the metal material constituting the metal strands 140a and 140b of the braided body 124 is not particularly limited, and for example, a wire made of tungsten, stainless steel, or the like is preferably used. Among these, tungsten wires having good visibility under X-ray fluoroscopy are more preferably used.

  The sizes of the metal strands 140a and 140b are not particularly limited, and are appropriately determined depending on the size (outer diameter) of the catheter body 111 and the tip 112. In the present embodiment, the diameters of the metal strands 140a and 140b are about 0.023 mm. One metal strand 140a and metal strand 140b are alternately knitted to form a braided body 124.

  The outer resin layer 128 constitutes the outermost layer of the catheter body 111. Then, the metal strands 140a and 140b constituting the braided body 124 are covered over the entire length of the catheter main body 111 in a state of covering the braided body 124 so as not to be exposed to the outside from the outer surface of the catheter main body 111. It is extended.

In addition, the resin material which forms the outer side resin layer 128 can use the material similar to the outer side resin layer 28 of 1st Embodiment.

  Further, the distal tip 112 provided at the distal end of the catheter main body 111 has an overall shape of an elongated cylindrical shape having a lumen communicating with the lumen 116 of the catheter main body 111, and has sufficiently higher flexibility than the catheter main body 111. Have. The tip 112 has a tapered outer peripheral surface that gradually decreases in diameter toward the most distal portion 48.

In addition, the resin material which forms the front-end | tip chip | tip 112 can use the material similar to the front-end | tip chip 12 of 1st Embodiment.

The inner peripheral portion of the distal tip 112 is formed by an inner resin layer 126 extending from the distal end of the catheter main body 111. Inside the distal tip 112, a braided body 124 continuous from the distal end of the catheter main body 111 is formed as an inner resin layer. It is wound around the outer periphery of 126 and embedded.

  In addition, a reinforcing body 130 made of a resin harder than the resin material of the tip chip 112 is provided in the tip chip 112 to prevent the tip chip 112 from being detached from the braided body 124. It is fixed to. Thereby, even if the distal tip 112 is detached from the catheter body 111, the reinforcing member 130 fixed to the distal tip 112 and the braided body 124 prevents the distal tip 112 from being detached from the braided body 124. The tip 112 is prevented from being detached from the catheter body 111.

Here, the reinforcing body 130 may be any member as long as it fixes the distal tip 112 and the coil body 124. However, in order to effectively prevent the distal tip 112 from detaching from the catheter body 111 in the axial direction of the catheter, It is preferable to form so as to have a protrusion 132 extending toward the surface.
In addition, in the reinforcement body 130 of this Embodiment, although the protrusion part 132 was provided in two places, it may be one place and may provide three or more places.

(Third embodiment)
Next, a third embodiment of the present invention will be described. The catheter of 3rd Embodiment differs in the position of a reinforcement body compared with the catheter of 1st Embodiment. That is, the catheter reinforcement of the first embodiment is disposed only in the distal tip, whereas the catheter reinforcement of the third embodiment is disposed across the catheter body and the distal tip.

On the other hand, the catheter in the third embodiment is the same in appearance as the catheter 10 in the first embodiment, and therefore, the overall view is omitted and only the internal structure will be described using the drawings.

FIG. 4 is a partial cross-sectional view of a catheter according to a third embodiment of the present invention. In FIG. 4, the catheter body 211 is constituted by a hollow long member having a lumen 216 into which a guide wire is inserted. As shown in FIG. 4, the catheter body 211 includes a coil body 224, an inner resin layer 226 that covers the inner peripheral surface of the coil body 224, and an outer resin layer 228 that covers the outer peripheral surface of the coil body 224. Have.

The inner resin layer 226 has a tube shape extending over the entire length on the innermost side of the catheter main body 211. Further, the inner resin layer 226 extends from the distal end of the catheter main body 211 to the distal end side in the axial direction. In addition, the resin material which forms such an inner resin layer 226 can use the same material as the inner resin layer 26 of the first embodiment.

The coil body 224 is a hollow stranded wire coil obtained by twisting a plurality of (10 in the present embodiment) metal strands 240 having a circular cross section. Moreover, since this coil body 224 is heat-processed by the well-known method after the several metal strand 240 is twisted together, the residual stress of the coil body 224 is removed.

As the metal material constituting the metal wire 240 of the coil body 224, the same material as that of the metal wire 40 of the first embodiment can be used.

The outer resin layer 228 constitutes the outermost layer that provides the outer surface of the catheter body 211. Then, the outer peripheral surface of the metal wire 240 forming the coil body 224 is covered with the outer peripheral surface of the coil body 224 so that the outer peripheral surface of the metal wire 240 is not exposed to the outside from the outer surface of the catheter main body 211. It extends over the entire length.

In addition, the resin material which forms the outer side resin layer 228 can use the material similar to the outer side resin layer 28 of 1st Embodiment.

  On the other hand, the distal end tip 212 provided at the distal end of the catheter body 211 has an overall shape of an elongated cylindrical shape having a lumen communicating with the lumen 216 of the catheter body 211, and has sufficiently higher flexibility than the catheter body 211. Have. The tip 212 has a tapered outer peripheral surface that gradually decreases in diameter toward the most distal portion 48.

In addition, the resin material which forms the front-end | tip chip | tip 212 can use the material similar to the front-end | tip chip 12 of 1st Embodiment.

The inner peripheral portion of the distal tip 212 is formed by an inner resin layer 226 extending from the distal end of the catheter body 211. Inside the distal tip 212, a coil body 224 continuous from the distal end of the catheter body 211 is formed as an inner resin layer. It is wound around the outer periphery of 226 and buried.

  Further, at the distal end portion of the catheter body 211 and the proximal end portion of the distal tip 212, a reinforcing body 230 made of a resin harder than the resin material of the distal tip 212 is disposed across the catheter main body 211 and the distal tip 212. It is fixed. This prevents the distal tip 212 from being detached from the catheter body 211, and even if the distal tip 212 is detached from the catheter body 211, the reinforcing member 230 fixed to the distal tip 212 and the coil body 224 is used. Thus, the distal tip 212 is prevented from being detached from the coil body 224, and further, the distal tip 212 is prevented from being detached from the catheter body 211.

Here, the reinforcing body 230 may be any member as long as it fixes the distal tip 212 and the coil body 224, but in order to effectively prevent the distal tip 212 from being detached from the catheter body 211 in the axial direction of the catheter, It is preferable to form the protrusion 232 extending toward the bottom.
In addition, in the reinforcement body 230 of this Embodiment, although the protrusion part 232 was provided in two places, it may be one place and may provide three or more places.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. The catheter in the fourth embodiment differs from the catheter in the second embodiment in the position of the reinforcing body. That is, the reinforcement body of the catheter of the second embodiment is disposed only in the distal tip, whereas the reinforcement body of the catheter of the fourth embodiment is disposed across the catheter body and the distal tip. Also, the catheter in the fourth embodiment is the same in appearance as the catheter 10 in the first embodiment, so that the overall view is omitted and only the internal structure will be described using the drawings.

FIG. 5 is a partial cross-sectional view of a catheter according to the fourth embodiment of the present invention. In FIG. 5, the catheter body 311 is composed of a hollow long member having a lumen 316 into which a guide wire is inserted. As shown in FIG. 5, the catheter body 311 includes a braided body 324, an inner resin layer 326 that covers the inner peripheral surface of the braided body 324, and an outer resin layer 328 that covers the outer peripheral surface of the braided body 324. Have.

The inner resin layer 326 has a tube shape extending over the entire length on the innermost side of the catheter body 311. The inner resin layer 326 extends from the distal end of the catheter body 311 to the distal end side in the axial direction. In addition, the resin material which forms such an inner layer resin layer 326 can use the same material as the inner side resin layer 26 of 1st Embodiment.

The braided body 324 has a structure in which two metal strands 340a and 340b are knitted alternately so as to have a mesh shape. And the braided body 324 which has such a mesh structure is wound over the outer peripheral surface of the inner side resin layer 326 over the full length.

Further, the braided body 324 extends in the distal axial direction from the distal end of the catheter body 311, similarly to the inner resin layer 326, and is wound around the outer peripheral surface of the inner resin layer 326 extending from the distal end of the catheter body 311. ing.

As the metal material constituting the metal strands 340a and 340b of the braided body 324, the same material as the metal strands 140a and 140b of the braided body 124 of the second embodiment can be used.

  The outer resin layer 328 constitutes the outermost layer of the catheter body 311. Then, the metal strands 340a and 340b constituting the braided body 324 are covered with the braided body 324 so as not to be exposed from the outer surface of the catheter main body 311 to the entire length of the catheter main body 311. It is extended.

In addition, the resin material which forms the outer side resin layer 328 can use the material similar to the outer side resin layer 28 of 1st Embodiment.

  The distal tip 312 provided at the distal end of the catheter body 311 has an overall shape of an elongated cylindrical shape having a lumen communicating with the lumen 316 of the catheter body 311, and has sufficiently higher flexibility than the catheter body 311. Have. The tip 312 has a tapered outer peripheral surface that gradually decreases in diameter toward the most distal portion 48.

The resin material for forming the tip chip 312 can be the same material as the tip chip 12 of the first embodiment.

The inner peripheral portion of the distal tip 312 is formed by an inner resin layer 326 extending from the distal end of the catheter main body 311, and a braided body 324 continuous from the distal end of the catheter main body 311 is formed inside the distal tip 312. It is wound around the outer periphery of 326 and buried.

In addition, a reinforcing body 330 made of a resin harder than the resin material of the distal tip 312 is disposed across the catheter main body 311 and the distal tip 312 at the distal end of the catheter main body 311 and the proximal end of the distal tip 312. It is fixed. Thus, the distal tip 312 is prevented from being detached from the catheter body 311, and even if the distal tip 312 is detached from the catheter body 311, the reinforcing body 330 fixed to the distal tip 312 and the coil body 324 is used. The distal tip 312 is prevented from being detached from the coil body 324, and further, the distal tip 312 is prevented from being detached from the catheter body 311.

Here, the reinforcing member 330 may be any member as long as it fixes the distal tip 312 and the coil body 324. However, in order to effectively prevent the distal tip 312 from being detached from the catheter body 311 in the axial direction of the catheter, It is preferable to form the protrusion 332 extending toward the end.
In addition, in the reinforcement body 330 of this Embodiment, although the projection part 332 was provided in two places, it may be one place and may provide three or more places.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described. The catheter of the fifth embodiment differs from the catheter of the first embodiment and the catheter of the third embodiment in the configuration of the reinforcing body. That is, the reinforcement body of the catheter of the first embodiment and the reinforcement body of the third embodiment are provided separately from the catheter body, whereas the reinforcement body of the catheter of the fifth embodiment is integrated with the catheter body. It is configured.

Note that the catheter in the fifth embodiment is the same in appearance as the catheter 10 in the first embodiment, so that the overall view is omitted and only the internal structure will be described using the drawings.

FIG. 6 is a partial sectional view of a catheter according to a fifth embodiment of the present invention. In FIG. 6, the catheter main body 411 is comprised from the hollow elongate member which has the lumen | rumen 416 in which a guide wire is inserted. As shown in FIG. 6, the catheter body 411 includes a coil body 424, an inner resin layer 426 that covers the inner peripheral surface of the coil body 424, and an outer resin layer 428 that covers the outer peripheral surface of the coil body 424. Have.

The inner resin layer 426 has a tube shape extending over the entire length on the innermost side of the catheter body 411. The inner resin layer 426 extends from the distal end of the catheter body 411 toward the distal end side in the axial direction. In addition, the resin material which forms such an inner side resin layer 426 can use the material similar to the inner side resin layer 26 of 1st Embodiment.

The coil body 424 is a hollow stranded wire coil in which a plurality of metal strands 440 (10 in this embodiment) are twisted together. Moreover, since this coil body 424 is heat-processed by the well-known method after the several metal strand 440 is twisted together, the residual stress of the coil body 424 is removed.

As the metal material constituting the metal wire 440 of the coil body 424, the same material as that of the metal wire 40 of the first embodiment can be used.

The outer resin layer 428 constitutes the outermost layer that provides the outer surface of the catheter body 411. Then, in a state where the outer peripheral surface of the metal wire 440 forming the coil body 424 is not exposed to the outside from the outer surface of the catheter body 411, the entire circumference of the outer peripheral surface of the coil body 424 is covered. The main body 411 extends over the entire length.

In addition, the resin material which forms the outer side resin layer 428 can use the material similar to the outer side resin layer 28 of 1st Embodiment.

  On the other hand, the distal end tip 412 provided at the distal end of the catheter main body 411 has an overall shape of an elongated cylindrical shape having a lumen communicating with the lumen 416 of the catheter main body 411, and has sufficiently higher flexibility than the catheter main body 411. Have. The tip 412 has a tapered outer peripheral surface that gradually decreases in diameter toward the most distal portion 48.

In addition, the resin material which forms the front-end | tip chip 412 can use the material similar to the front-end | tip chip 12 of 1st Embodiment.

The inner peripheral portion of the distal tip 412 is formed by an inner resin layer 426 extending from the distal end of the catheter body 411. Inside the distal tip 412, a coil body 424 continuous from the distal end of the catheter body 411 is provided. It is wound around the outer periphery of 426 and embedded.

A reinforcing body 430 extending from the distal end of the catheter main body 411 is fixed to the proximal end portion of the distal tip 412. This prevents the distal tip 412 from being detached from the catheter body 411.

  Here, the reinforcing body 430 may be any member as long as it fixes the distal tip 412 and the coil body 424, but in order to effectively prevent the distal tip 412 from being detached from the catheter body 411 in the axial direction of the catheter, It is preferable to form so as to have a protrusion 432 extending toward the surface.

  Note that although one protrusion 432 is provided in this embodiment, two or more protrusions 432 may be provided.

(Sixth embodiment)
Finally, a sixth embodiment of the present invention will be described. The catheter of the sixth embodiment differs from the catheter of the second embodiment and the catheter of the fourth embodiment in the configuration of the reinforcing body. That is, the reinforcement body of the catheter of the second embodiment and the reinforcement body of the fourth embodiment are provided separately from the catheter body, whereas the reinforcement body of the catheter of the sixth embodiment is integrated with the catheter body. It is structured.

  Note that the catheter in the sixth embodiment is the same in appearance as the catheter 10 in the first embodiment, so that the overall view is omitted and only the internal structure will be described using the drawings.

FIG. 7 is a partial sectional view of a catheter according to a sixth embodiment of the present invention. In FIG. 7, the catheter body 511 is constituted by a hollow long member having a lumen 516 into which a guide wire is inserted. As shown in FIG. 7, the catheter body 511 includes a braided body 524, an inner resin layer 526 that covers the inner peripheral surface of the braided body 524, and an outer resin layer 528 that covers the outer peripheral surface of the braided body 524. Have.

The inner resin layer 526 has a tube shape extending over the entire length on the innermost side of the catheter body 511. Further, the inner resin layer 526 extends from the distal end of the catheter body 511 toward the distal end side in the axial direction. In addition, the resin material which forms such an inner side resin layer 526 can use the material similar to the inner side resin layer 26 of 1st Embodiment.

The braided body 524 has a structure in which two metal strands 540a and 540b are alternately knitted so as to have a mesh shape. A braided body 524 having such a mesh structure is wound around the outer peripheral surface of the inner resin layer 526 over the entire length.

Further, like the inner resin layer 526, the braided body 524 extends in the distal axial direction from the distal end of the catheter body 511, and is wound around the outer peripheral surface of the inner resin layer 526 extending from the distal end of the catheter body 511. ing.

As the metal material constituting the metal strands 540a and 540b of the braided body 524, the same material as the metal strands 140a and 140b of the braided body 124 of the second embodiment can be used.

  The outer resin layer 528 constitutes the outermost layer that provides the outer surface of the catheter body 511. The catheter body is covered with the outer peripheral surface of the braided body 524 so that the outer peripheral surfaces of the metal wires 540a and 540b forming the braided body 524 are not exposed to the outside from the outer surface of the catheter main body 511. It extends over the entire length of 511.

In addition, the resin material which forms the outer side resin layer 528 can use the material similar to the outer side resin layer 28 of 1st Embodiment.

  On the other hand, the distal end tip 512 provided at the distal end of the catheter main body 511 has an overall shape of an elongated cylindrical shape having a lumen communicating with the lumen 516 of the catheter main body 511, and has sufficiently higher flexibility than the catheter main body 511. Have. The tip 512 has a tapered outer peripheral surface that gradually decreases in diameter toward the most distal portion 48.

In addition, the resin material which forms the front-end | tip chip | tip 512 can use the material similar to the front-end | tip chip 12 of 1st Embodiment.

The inner peripheral portion of the distal tip 512 is formed by an inner resin layer 526 that extends from the distal end of the catheter body 511. Inside the distal tip 512, a braided body 524 that is continuous from the distal end of the catheter body 511 has an inner resin layer. It is wound around the outer periphery of 526 and buried.

  A reinforcing body 530 extending from the distal end of the catheter main body 511 is fixed to the proximal end portion of the distal tip 512. This prevents the distal tip 512 from being detached from the catheter body 511.

  Here, the reinforcing member 530 may be any member as long as it fixes the distal tip 512 and the braided body 524, but in order to effectively prevent the distal tip 512 from being detached from the catheter body 511 in the axial direction of the catheter, It is preferable to form so as to have a protrusion 532 extending toward the surface. As a result, the distal tip 512 is further prevented from detaching from the catheter body 511, and further, the distal tip 512 is prevented from detaching from the catheter body 511.

  In the present embodiment, one protrusion 532 is provided, but two or more may be provided.

As mentioned above, although embodiment of this invention has been explained in full detail, this invention is not limited at all by the specific description regarding this embodiment.

  For example, in the above-described embodiments, the reinforcing bodies are all illustrated as having a diameter larger than the diameter of the coil body or the braided body, but the reinforcing body is not necessarily larger than the diameter of the coil body or the braided body. It need not have a diameter.

  However, if the reinforcing body has a diameter larger than the diameter of the coil body or the braided body, it is possible to further prevent the tip from being detached from the coil body or the braided body.

  In the above-described embodiment, it has been described that the reinforcing body is made of a resin harder than the resin constituting the tip, but the reinforcing body is not necessarily a resin harder than the resin constituting the tip. It is not necessary to consist of

  However, if the reinforcing body is made of a resin harder than the resin constituting the tip, the tip can be further prevented from being detached from the coil body or the braided body.

 In addition, the coil body in the above-described embodiment uses 10 metal strands having the same diameter to constitute the coil body. For example, 8 metal strands are used as the metal strands having the same diameter. The coil body may be formed by using the remaining two metal wires having different diameters, or the coil body may be formed by using only one metal wire.

  However, the coil body is preferably composed of a plurality of strands. This is because the extension of the coil body can be reduced when the tip is detached from the catheter body.

  In the coil body in the above-described embodiment, the metal wires constituting the coil body are arranged apart from each other in the axial direction of the catheter body, so-called loosely wound state is shown. Alternatively, when it is desired to improve the torque transmission from the proximal end to the distal end of the catheter, it is preferable that the metal wires are arranged in contact with each other to form a so-called tightly wound state.

  Further, although the braided body in the above-described embodiment is formed by alternately braiding two metal strands having the same diameter, the braided body may be formed by alternately braiding metal strands having different diameters. In addition, not only two metal strands but also more metal strands may be knitted, or the number of right-handed and left-handed metal strands may be different.

Moreover, although the strand which comprises the braided body in the above-mentioned embodiment was a metal strand, for example, it may be formed by knitting a resin strand, or may be knitted by combining a metal strand and a resin strand. . Further, the number of strands forming the braided body and the braided form of the strands can be changed as appropriate.

In addition, although the metal wire constituting the coil body and the braided body in the above-described embodiment is a wire having a circular cross section, the coil body and the braided body use a wire having an elliptical cross section and a wire having a rectangular cross section. May be formed.

Moreover, although the protrusion part in the above-mentioned embodiment described and explained the protrusion part of the curved shape as a whole, it is not limited thereto, for example, the protrusion part of a sharp pointed shape at the top of the tip Or the protrusion part which entered the wedge shape diagonally with respect to the front-end | tip tip may be sufficient.

  Further, in the above-described embodiment, the form in which the coil body or the braid is arranged on the outer periphery of the inner resin layer in consideration of the ease of forming the coil body and the braid has been described. And a coil body or a braid may be arranged in one resin layer, and not only two layers of an inner resin layer and an outer resin layer but also a part of a multilayer structure of three or more layers The present invention can be applied even in a form in which a coil body or a braid is disposed in the layer.

  Further, in the above-described embodiment, the configuration in which each catheter has only the coil body or only the braid has been described. However, the present invention can be applied to a configuration in which both the coil body and the braid are disposed in one catheter. Is possible.

It is front explanatory drawing which shows embodiment of the catheter of this invention. It is a fragmentary sectional view of the catheter in a 1st embodiment of the present invention. It is a fragmentary sectional view of the catheter in a 2nd embodiment of the present invention. It is a fragmentary sectional view of the catheter in a 3rd embodiment of the present invention. It is a fragmentary sectional view of the catheter in a 4th embodiment of the present invention. It is a fragmentary sectional view of the catheter in a 5th embodiment of the present invention. It is a fragmentary sectional view of the catheter in a 6th embodiment of the present invention.

10 Catheter 11, 111, 211, 311, 411, 511 Catheter body 12, 112, 212, 312, 412, 512 Tip tip 14 Connector 16, 116, 216, 316, 416, 516 Lumen 18 Tip 20 Intermediate 22 End portion 24, 224, 424 Coil body 26, 126, 226, 326, 426, 526 Inner resin layer 28, 128, 228, 328, 428, 528 Outer resin layer 30, 130, 230, 330, 430, 530 Reinforcing body 40, 140a, 140b, 240, 340a, 340b, 440, 540a, 540b Metal strand 48 Most advanced part 124, 324, 524 Braided body 132, 232, 332, 432, 532 Protrusion part

Claims (7)

A catheter body having a lumen;
A resin tip having a lumen communicating with the lumen of the catheter body, connected to the tip of the catheter body;
A coil body and / or a braid disposed along the lumen in the catheter body and the tip;
A catheter comprising:
The distal end tip is provided with a reinforcing body that covers the coil body and / or the braid.   The catheter according to claim 1, wherein the reinforcing body has a diameter larger than a diameter of the coil body and / or the braid.   The catheter according to claim 2, wherein the reinforcing body has a protrusion extending toward an outer periphery of the distal tip.   The catheter according to any one of claims 1 to 3, wherein the reinforcing body is made of a resin harder than a resin constituting the distal tip. The catheter according to any one of claims 1 to 4, wherein the reinforcing body is disposed across the catheter body and the distal tip.   The catheter according to claim 5, wherein the reinforcing body has a protruding portion extending toward an outer periphery of each of the catheter body and the distal tip.   The catheter according to any one of claims 1 to 5, wherein the reinforcing body is formed integrally with the catheter body.

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