JP6739087B2 - Catheter and catheter protector - Google Patents

Description

The present invention relates to a catheter, and more particularly to a catheter that sucks and discharges a substance in a body cavity.

BACKGROUND ART Conventionally, there is known a catheter having a tubular main body, which is introduced into a body cavity and sucks a substance in the body cavity by a negative pressure applied from a proximal end side to discharge the substance out of the body.

For example, Patent Document 1 discloses a thrombus suction catheter that introduces a tube having a suction port on the distal side into a blood vessel to reach a lesion site and sucks and removes a thrombus from the suction port. Such a conventionally known catheter has a problem in that the suction port is blocked by the living tissue adjacent to the suction port (and by the suction target when the suction target is a solid).

In addition, in mitral valve angioplasty of the heart, in order to access the surgical site and secure a visual field by temporarily stopping the heart and sucking all the blood in the heart, a part from the distal end up to 30 mm It is known to use a vent catheter having a plurality of suction holes on the outer circumference of the tube (for example, Patent Document 2).

The above-mentioned vent catheter is used for sucking the blood because blood flows into the heart through the right upper pulmonary vein during operation and obstructs the visual field, but the blood vessel wall is used as the suction hole of the vent catheter during blood suction. There is a problem in that the suction of blood is hindered by the suction and blockage of the suction hole.

JP, 2007-236633, A JP-A-62-243566

In view of such a problem, the present invention provides a technique for preventing a blockage of the suction opening in a catheter that is used by being introduced into a body cavity and that suctions a suction target containing at least a liquid. With the goal.

In order to solve the above problems, a catheter according to the present invention is used by being introduced into a body cavity, and is a catheter that sucks an object to be suctioned containing at least a liquid, and has a proximal end side and a distal end side. A tube body having a communicating cavity and an opening communicating with the outside at the distal end side, and a tube body provided so as to cover the vicinity of the distal end of the tube body, and the opening is closed. And an opening protection part that prevents the opening protection part, and the opening protection part includes a plurality of isolation parts for isolating the tissue in the body cavity from the opening, and the plurality of isolation parts are separated from each other by a predetermined distance. It is characterized in that it is provided vacant.

In the present specification, “proximal” and “distal” are described with reference to the operator of the catheter, and the “proximal end” refers to the end near the operator. According to the above-mentioned structure, since the tissue in the body cavity is isolated from the suction opening by the isolation portion, it is possible to prevent the opening from being closed. Further, since the suction space is formed, it is possible to suck a suction target having a property capable of passing through the space.

Further, the plurality of isolation portions may extend in the longitudinal direction of the tube body and may bulge outward in a convex shape. With such a configuration, the living tissue can be effectively isolated at the outer peripheral side surface of the tube, which is suitable for a catheter having an opening on the side surface of the tube.

The opening protection part may be formed so that the plurality of isolation parts are arranged at equal intervals along the circumferential direction of the tube. With such a configuration, since the isolating portion and the suction space are uniformly formed, it is possible to prevent the opening of the tube from being closed regardless of the circumferential direction of the catheter.

Further, the plurality of isolation portions in the opening protection portion may be formed of wires. Note that the wire mentioned here includes not only a round wire, but also a flat wire, a wire having an irregular cross section, and the like. With such a configuration, the suction space can be easily formed, and at the same time, it is also possible to configure the isolation part by using a wire whose shape is memorized.

Further, each of the isolation portions may include a bent portion that is convex toward the proximal end side at the proximal end of the opening protection portion. Further, the bent portion may be formed by bending an end portion on the proximal end side of the isolation portion toward the tube body side.

Further, each of the plurality of isolation portions is formed by a plurality of wires, and each isolation portion includes a wire intersection portion in which the plurality of wires intersect in the circumferential direction in the vicinity of the proximal end of the opening protection portion. May be.

Further, the openings may be arranged within 30 mm from the distal end of the tube body, and the number thereof may be 5 or more and 8 or less.

Further, the tube main body and the opening protection part may be separate bodies, and the opening protection part may include a coupling means for connecting to the tube main body. With such a configuration, it is possible to retrofit the opening protection part to a general catheter.

Further, the tube body is provided with a threaded portion, the opening protection portion further includes a threaded portion that can be threadedly engaged with the threaded portion at least on the proximal end side, and the coupling means is the threaded portion. It may include a portion and the screwed portion. With such a configuration, the opening protection portion and the tube body can be firmly coupled. Further, the threaded portion may be formed of a coil.

Further, the tube body is provided with an opening at least at a distal end of the tube body, the opening protection portion is formed to be elastically deformed, and the opening of the tube body is formed from the opening at the distal end of the tube body. The connection means may further include a retaining portion that is housed inside and prevents the tube from coming off from the tube main body by contacting the inner wall of the tube by a restoring force, and the coupling means includes the retaining portion. You may stay.

With such a configuration, the opening protection portion and the tube body can be coupled simply by inserting the retaining portion into the tube body through the opening at the distal end, and the catheter according to the present invention can be easily configured. be able to.

Further, the opening protection portion may further include a puncture needle extending from the distal end side to the proximal end side and located along the center of the cross section of the tube body in the lateral direction. With such a configuration, the puncture needle serves as a guide for the center position in the lateral cross section of the tube body, so that the distance between the plurality of isolation portions and the outer peripheral side surface of the tube is not biased, The opening protector and the tube body can be joined together.

Further, the puncture needle does not necessarily have to be located along the center of the tube body in a cross section in the lateral direction, and in a state where the opening protection portion is coupled to the tube body, the opening protection portion of the tube body is The puncture needle is provided with a length extending from the proximal end to the proximal side, and by plastically deforming the puncture needle, the shape of the portion of the tube body on the proximal side of the proximal end of the opening protection part is changed to It may be configured to be adjustable according to the shape after deformation. With such a configuration, it becomes possible to bend the distal end side of the tube into a desired shape and maintain it.

Further, the opening protection part further includes a tubular tube holding part extending toward the proximal end side and having an inner diameter larger than the outer diameter of the tube body, and the coupling means is configured to hold the tubular tube holding part. The tube body and the opening protection portion may be coupled by inserting a distal end side of the tube body into the tubular tube holding portion including a portion.

With such a configuration, the tube body and the opening protection portion can be coupled without providing a means for coupling on the tube body side, and the coupling means is not arranged inside the tube. Thus, the volume in the tube can be effectively used as a path for suction.

Further, in a state in which the opening protection part is coupled to the tube body, by plastically deforming the tubular tube holding part, the shape of a part of the tube body on the proximal side from the proximal end of the opening protection part is changed. The cylindrical tube holding portion may be configured to be adjustable according to the deformed shape. With such a configuration, it becomes possible to bend the distal end side of the tube into a desired shape and maintain it.

Further, the catheter protector according to the present invention includes a cavity portion that communicates the proximal end and the distal end, and an opening that communicates the cavity portion and the outside in the vicinity of the distal end. A catheter that is used by being coupled by a coupling means to a catheter that is introduced to aspirate an object to be aspirated containing at least a liquid from the opening, and is disposed so as to cover the vicinity of the distal end and prevents the opening from being blocked. The protector includes a plurality of isolation parts for isolating the tissue in the body cavity from the opening, and the plurality of isolation parts are provided at a predetermined interval from each other.

According to the present invention, it is possible to provide a technique of suppressing the closing of the suction opening in a catheter which is introduced into a body cavity and is used to suck a suction target containing at least a liquid.

FIG. 1A is a schematic view showing the vicinity of the distal end of the vent catheter according to the first embodiment. FIG. 1B is a schematic view of a catheter protector according to the first embodiment. FIG. 1C is a diagram schematically showing the distal side of the tube according to the first embodiment. FIG. 2A is a schematic view showing the vicinity of the distal end of a vent catheter according to a first modification of the first embodiment. FIG. 2B is a schematic view of the vicinity of the distal end of the tube according to the first modification of the first embodiment. FIG. 3A is a schematic diagram showing the vicinity of the distal end of a vent catheter according to a second modification of the first embodiment. FIG. 3B is a diagram showing an outline of a catheter protector according to a second modification of the first embodiment. FIG. 3C is a diagram showing a retaining portion according to a second modification of the first embodiment. FIG. 4A is a first diagram illustrating another example of the retaining portion stopper according to the second modification of the first embodiment. FIG. 4B is a second diagram illustrating another example of the retaining portion stopper according to the second modification of the first embodiment. FIG. 5A is a schematic view showing the vicinity of the distal end of a vent catheter according to a third modification of the first embodiment. FIG. 5B is a schematic view of a catheter protector according to a third modification of the first embodiment. FIG. 6A is a schematic view showing the vicinity of the distal end of a vent catheter according to a fourth modification of the first embodiment. FIG. 6B is a diagram showing an outline of a catheter protector according to a fourth modification of the first embodiment. FIG. 7A is a diagram showing an outline of a catheter protector according to a fifth modification of the first embodiment. FIG. 7B is a diagram showing a first state of the vent catheter according to the fifth modification of the first embodiment. FIG. 7C is a diagram showing a second state of the vent catheter according to the fifth modification of the first embodiment. FIG. 8A is a schematic view showing the vicinity of the distal end of the vent catheter according to the second embodiment. FIG. 8B is a schematic view of a catheter protector according to the second embodiment. FIG. 8C is a diagram schematically showing the distal side of the tube according to the second embodiment. FIG. 9A is a first diagram illustrating a method of connecting the catheter protector and the tube according to the second embodiment. FIG. 9B is a second diagram illustrating a method of connecting the catheter protector and the tube according to the second embodiment. FIG. 9C is a third diagram illustrating the method of joining the catheter protector and the tube according to the second embodiment. FIG. 10A is a schematic view showing the vicinity of the distal end of a vent catheter according to a modification of the second embodiment. FIG. 10B is a schematic view of a catheter protector according to a modification of the second embodiment. FIG. 10C is a schematic view of the vicinity of the distal end of the tube according to the modification of the second embodiment. FIG. 11A is a schematic view showing the vicinity of the distal end of the vent catheter according to the third embodiment. FIG. 11B is a schematic view of a catheter protector according to the third embodiment. FIG. 11C is a diagram schematically showing the distal side of the tube according to the third embodiment. FIG. 12A is a first diagram illustrating a method of connecting the tube and the catheter protector according to the third embodiment. FIG. 12B is a second diagram illustrating a method of connecting the tube and the catheter protector according to the third embodiment. FIG. 12C is a diagram illustrating a method of using the vent catheter after connecting the tube and the catheter protector according to the third embodiment. FIG. 13A is a first diagram illustrating the configuration of the tube according to the fourth embodiment and the method of connecting the tube and the catheter protector. FIG. 13B is a second diagram illustrating the configuration of the tube according to the fourth embodiment and the method of connecting the tube and the catheter protector. FIG. 13C is a third diagram illustrating the configuration of the tube according to the fourth embodiment and the method of connecting the tube and the catheter protector. FIG. 14 is a diagram showing another example of the catheter protector.

MODES FOR CARRYING OUT THE INVENTION Hereinafter, modes for carrying out the present invention will be exemplarily described based on embodiments with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto unless otherwise specified. Also, in the following, the same elements will be denoted by the same reference symbols, without redundant description.

<Example 1>
FIG. 1 is an explanatory view showing the outline of a vent catheter 1 according to this embodiment. FIG. 1A is a schematic view showing the vicinity of the distal end of the vent catheter 1. The vent catheter 1 according to the present embodiment has a configuration in which a catheter protector 11 separate from the tube is joined to the distal end side of the tube 12, and the catheter protector 11 in the joined state is the opening protection part of the present invention. Corresponds to. A connector is provided on the proximal end side (not shown) of the vent catheter 1, and the connector can be connected to the negative pressure generating means.

FIG. 1B is a schematic view of the catheter protector 11. The catheter protector 11 includes a suction port protection part 111 composed of a wire, a screwing part 112 in which a wire is formed into a coil, and a hollow part of the suction port protection part 111 with a center from a distal side to a proximal side. A puncture needle 113 extending in the direction is provided.

The material of the wire is, for example, stainless steel, but is not limited to this and may be other metal or resin. Alternatively, a metal coated with a resin may be used. Further, the suction port protection part 111 and the screwing part 112 may be formed of different types of wires or the same material.

The suction port protection unit 111 binds one end of the twelve isolation wires 115, folds each wire outward, and arranges the other end evenly in the circumferential direction to fix the wire to the screwing unit 112. Each wire is curved so that it swells with the apex near the center on the distal side and the proximal side. Here, each of the isolation wires 115 forming the suction port protection unit 111 corresponds to the isolation unit of the present invention. The suction port protection part 111 can be fixed to the threaded part 112 of the isolation wire 115 by, for example, laser welding. In addition, when the material of each member is resin, they may be bonded with an adhesive or may be welded.

The screwing portion 112 has a coil shape formed of a wire having an outer diameter that allows screwing with a screw portion 122 of the tube 12 described later. In addition, when the coil and the isolation wire 115 that forms the suction port protection portion 111 are welded, a cover may be provided on the screwing portion 112 so that the welding portion does not damage the living tissue. Good. It is desirable that the material of the cover has a certain flexibility, and for example, a polymer material can be used.

The puncture needle 113 is fixed to the binding portion of the isolation wire 115 on the distal side, and is arranged so that the tip of the needle faces the proximal side. The material of the puncture needle 113 is not particularly limited, and for example, metal such as stainless steel or resin can be used.

The size of the catheter protector 11 is not particularly limited, but for example, the length in the longitudinal direction (distance between the proximal end and the most distal position) is 45 mm to 55 mm, and the suction port protection part 111 has the most swollen position. Can have a diameter of 14 mm to 19 mm, and the threaded portion 112 can have a diameter of 5 to 10 mm.

FIG. 1C is a diagram schematically showing the distal side of the tube 12. The tube 12 is made of a soft resin (for example, polyvinyl chloride) and has a suction opening 121 and a screw portion 122. Further, in the present embodiment, a range of, for example, 30 mm from the distal end of the tube 12 corresponds to the suction opening 121, and the distal end opening 123 and the plurality of side surface openings 124 are provided in the range. The number of openings in the tube 12 may be any number, but may be, for example, 5 to 8. In this embodiment, the number of side surface openings is six.

To connect the catheter protector 11 and the tube 12 described above, the puncture needle 113 of the catheter protector 11 (and the binding portion of the wire fixed thereto) is inserted from the distal end opening 123 of the tube 12. It is inserted into the inner cavity of the tube 12, and the screw portion 122 and the screwing portion 112 are screwed together. At this time, the puncture needle 113 functions as a guide, and is also housed in the inner cavity of the tube 12 after the connection, and plays a role of defining the distance between the outer wall of the tube 12 and the suction port protection portion 111 to fall within a predetermined range. Fulfill.

When a liquid such as blood is sucked using the vent catheter 1 configured as described above, the suction port protection portion 111 formed by the isolation wire 115 removes biological tissue from the distal end opening 123 and the plurality of side surface openings 124. Isolation is performed to prevent biological tissue from adsorbing and clogging the openings. On the other hand, since the liquid is sucked into each opening through the space (corresponding to the suction space) formed between the plurality of isolation wires 115, the liquid can be sucked without any trouble.

(Modification 1)
In the first embodiment described above, the tube 12 has an opening at the distal end and the side surface of the tube, but it is possible to combine the tube having an opening only at one of these with the catheter protector 11. Is. FIG. 2 is a view showing a modification of the first embodiment, FIG. 2A is a schematic view of the vicinity of the distal end of the vent catheter 2 according to this modification, and FIG. 2B is a distal end of the tube 120 according to this modification. Each is shown a schematic view near the edge.

In the vent catheter 2 according to this modification, the catheter protector 11 has the same configuration as that of the first embodiment, and the tube 120 has a configuration different from that of the first embodiment. The distal end does not have an opening and has a hemispherical shape. It has a shape. Further, the number of side surface openings 124 is also different from that in the first embodiment.

When the catheter protector 11 is connected to such a tube 120, the puncture needle 113 is pierced and penetrated through the distal end of the tube 120 so that the puncture needle 113 can be housed inside the tube 120 as it is. The threaded portion 112 of the protector 11 and the threaded portion 122 of the tube 120 may be screwed together.

(Modification 2)
Further, in the above-mentioned embodiment, the connecting means for connecting the catheter protector 11 and the tube 12 is screwed by a screw, but the connecting means other than this may be provided. FIG. 3 is a view showing a modification of the first embodiment, FIG. 3A is a schematic view of the vicinity of the distal end of the vent catheter 3 according to this modification, and FIG. 3B is a catheter protector 110 according to this modification. FIG. 3C shows each retaining portion 114 described later.

The catheter protector 110 has a retaining portion 114 that is configured instead of or integrally with the puncture needle. The retaining portion 114 has an anchor-shaped stopper (a shape in which two fishing hooks are placed back to back), and at least the stopper is formed of an elastically deformable member. As shown in FIG. 3B, the stopper tip portion of the retaining portion 114 is normally formed to project outside the suction port protection portion 111.

When connecting the catheter protector 110 having such a configuration to the tube 12, the inner central portion of the catheter protector 110 including the retaining portion 114 is inserted into the tube lumen through the distal end opening 123 of the tube 12. Then, the retaining portion 114 (the stopper thereof) is housed in the inner cavity of the tube 12 while being elastically deformed.

The stopper of the retaining portion 114 housed in the inner cavity of the tube 12 in this way abuts against the inner wall of the tube 12 in order to return to the original shape due to the restoring force, and the force pressing from the inner side to the outer side. Occurs. This prevents the catheter protector 110 from falling off the tube 12. With such a configuration, the catheter protector 110 and the tube 12 can be easily coupled by simply inserting the catheter protector 110 into the distal end opening 123 of the tube 12.

Further, the tube 12 and the catheter protector 110 may be joined only by the retaining portion 114, or in addition, they may be screwed together by the screwing portion and the screw portion. By combining with screwing, the catheter protector 110 and the tube 12 can be more firmly connected.

The shape of the stopper of the retaining portion 114 is not limited to the above-exemplified shape, and various shapes can be used. 4A and 4B are views showing another example of the stopper of the retaining portion 114. As shown in FIG. 4A, the number of stoppers may be large, or as shown in FIG. 4B, one wire may be formed in a spiral shape. Alternatively, the tip portion may be sharpened to have a needle-like shape.

(Modification 3)
Further, in the above-described first embodiment, each isolation wire 115 of the catheter protector 11 is bent so as to form a convex portion on the distal end side, but each isolation wire 115 is also formed on the proximal end side. It may be configured to be bent so as to form a convex portion. 5: is a figure which shows the modification of Example 1, FIG. 5A is the schematic diagram of the distal end vicinity of the vent catheter 6 which concerns on this modification, FIG. 5B shows the catheter protector 61 which concerns on this modification, respectively. It represents.

As shown in FIGS. 5A and 5B, the catheter protector 61 includes a suction port protection part 611 formed of a wire, a screwing part 112 in which the wire is formed into a coil shape, and a hollow part of the suction port protection part 611. The puncture needle 113 extends from the distal side to the proximal side in the center.

Similar to the first embodiment, the suction port protection unit 611 binds one end of the twelve isolation wires 615, folds each wire outward and arranges the other end evenly in the circumferential direction. It is configured to be fixed to the outer peripheral surface of the threaded portion 112, and each wire is curved so as to bulge with the apex near the center on the distal side and the proximal side. The configurations of the screwing portion 112 and the puncture needle 113 are the same as those in the first embodiment.

In this modified example, the end portion on the proximal end side of the isolation wire 615 is bent to the tube 12 side near the proximal end of the threaded portion 112 and then fixed to the outer peripheral surface of the threaded portion 112. A substantially U-shaped bent portion 616 is formed at the proximal end of the suction port protection portion 611. As shown in FIG. 5B, the bent portion 616 is convex toward the proximal end side.

With such a configuration, a large distance can be secured between the tube 12 and the isolation wire 615 even near the proximal end of the suction port protection portion 611. Therefore, it is possible to prevent the biological tissue from being adsorbed in the vicinity of the proximal end of the suction port protection portion 611.

(Modification 4)
In addition, in each of the above examples, each isolation part is formed by one isolation wire, but the isolation part does not necessarily have to have such a configuration. FIG. 6 is a diagram showing this modification in which one isolation portion is formed by three wires, FIG. 6A is a schematic view of the vicinity of the distal end of the vent catheter 7 according to this modification, and FIG. Each of the catheter protectors 71 according to the present modification is shown.

As shown in FIG. 6B, in the catheter protector 71, the suction port protection part 711, the threaded part 112 in which a wire is formed into a coil shape, and the center of the hollow part of the suction port protection part 711 are close to the distal side. A puncture needle 113 is provided which extends to the position side.

The suction port protection part 711 includes a plurality of isolation parts 715 made up of three wires, and near the proximal end of each isolation part 715, a wire intersection at which the three wires forming these parts intersect. The part 717 is formed. In this modified example, four isolation portions 715 formed of three wires are provided, and the total number of wires forming the suction port protection portion 711 is 12. Also, one wire intersection 717 is formed in each of the isolation portions 715, that is, a total of four wire intersections 717 are formed.

By adopting such a configuration, in the wire intersection portion 717 of each isolation portion 715, three wires intersect three-dimensionally, and therefore the thickness in the radial direction (that is, the direction perpendicular to the puncture needle 113). Increases, and the rigidity in the same direction increases.

Therefore, in the vicinity of the proximal end of the suction port protection portion 711 where the distance between the living tissue and the tube 12 is relatively short, the inward force is applied to the isolating portion to bend it inward and remove the living tissue from the side opening 124. It is possible to prevent things such as being unable to be sufficiently isolated.

It is effective that the wire crossing portion 717 is formed in the vicinity of the proximal end of the suction port protection portion 711 as in this modification, but the position where the wire crossing portion 717 is formed is not limited to this. Absent. For example, it may be formed near the distal end of the suction port protection portion 711, or near the center between the proximal end and the distal end.

(Modification 5)
In each of the above examples, the puncture needle 113 has a function as a guide, but it may be configured to exert other functions. FIG. 7 is a diagram for explaining the vent catheter 8 according to this modification, and FIG. 7A shows a catheter protector 81 according to this modification. 7B and 7C are views for explaining the function of the puncture needle 813 of the catheter protector 81.

Compared with the first embodiment, the catheter protector 81 according to the present modification has a puncture needle 813 that extends longer in the proximal end direction, and is formed so that it can be plastically deformed by the force of the user's hand. Different. The material of the puncture needle 813 may be a metal, a metal coated with a resin, or a resin, as in the first embodiment. When the catheter protector 81 having such a configuration is coupled to the tube 12, the puncture needle 813 is arranged in the internal space of the tube 12 and extends long toward the proximal end side. FIG. 7B shows a normal state near the distal end of the vent catheter 8 to which the catheter protector 81 is applied.

When a force is applied to the puncture needle 813 of the vent catheter 8 described above, the puncture needle 813 is plastically deformed by the external force. Since the puncture needle 813 is arranged in the internal space of the tube 12, the tube 12 will be deformed following the deformation of the puncture needle 813 at the position where the puncture needle 813 is arranged. FIG. 7C is a diagram showing the vent catheter 8 in a state where the puncture needle 813 is plastically deformed into an arc shape by an external force, and the vicinity of the distal end is curved by this.

According to the above configuration, the user can bend the puncture needle 813 through the tube 12 and deform the vent catheter 8 into a desired shape for use, thus improving the operability of the vent catheter 8. Will be possible.

<Example 2>
Subsequently, a second embodiment of the present invention will be described with reference to FIGS. FIG. 8 is an explanatory view showing the outline of the vent catheter 4 according to this embodiment. FIG. 8A is a schematic view showing the vicinity of the distal end of the vent catheter 4. The vent catheter 4 according to the present embodiment has a configuration in which a catheter protector 21 separate from the tube is joined to the distal end side of the tube 22, and the catheter protector 21 in the joined state is the opening protection part of the present invention. Corresponds to.

FIG. 8B is a schematic view of the catheter protector 21. The catheter protector 21 is generally configured to include a suction port protection portion 211 configured by a plurality of flat wire 213, and screwing portions 212a and 212b arranged at both ends of the flat wire 213.

The size of the flat wire 213 is not particularly limited, but may be, for example, 0.6 mm×0.3 mm. The material of the flat wire 213 is, for example, stainless steel, but the material is not limited to this and other metal may be used.

In the suction port protection part 211, the ends of the eight flat wire 213 whose shape is memorized so that the central part bulges in a convex shape are arranged at equal distances in the circumferential direction to the screw parts 212a and 212b. It is fixed. The suction port protection part 211 can be fixed to the threaded parts 212a and 212b by laser welding, for example.

The threaded portions 212a and 212b are members having a screw that can be threadedly engaged with threaded portions 222a and 222b of the tube 22, which will be described later. For example, a commercially available nut or the like can be used. Further, a cover may be provided so that the welded portion does not damage the living tissue. It is desirable that the material of the cover has a certain flexibility, and for example, a polymer material can be used.

The size of the catheter protector 21 is not particularly limited. The diameter of the threaded portion can be 7 mm.

FIG. 8C is a diagram schematically showing the distal side of the tube 22. The tube 22 is made of a soft resin (for example, polyvinyl chloride) and has a suction opening 221, and screw portions 222a and 222b. Further, the suction opening portion 221 is provided with a plurality of side surface openings 224.

Next, a method of connecting the catheter protector 21 and the tube 22 will be described with reference to FIG. In order to connect the catheter protector 21 and the tube 22, first, the threaded portion 212a of the catheter protector 21 and the threaded portion 222b of the tube 22 are engaged and rotated (FIG. 9A). Then, the threaded portion 212a and the threaded portion 222b are once screwed together, but when the rotation is continued, the threaded portion 212a is pulled out from the threaded portion 222b to the proximal side (FIG. 9B). From here, when the threaded portion 212a, the threaded portion 222a, the threaded portion 212b, and the threaded portion 222b are engaged and rotated, the threaded portions and the threaded portions are screwed into each other, and the catheter protector 21 and , Tubes 22 are joined (FIG. 9C).

In the above description based on FIG. 9, the threaded portions 212a and 212b (and the threaded portions 222a and b) have the same diameter, but the diameter of the threaded portion 212a (and the threaded portion 222a) is the same. May be configured to be larger than the threaded portion 212b (and the threaded portion 222b), and the procedure for engaging the threaded portion 212a and the threaded portion 222b (the procedure in FIG. 9A) may be omitted.

When a liquid such as blood is sucked using the vent catheter 4 configured in this way, the suction port protection part 211 formed by the flat wire 213 isolates the biological tissue from the plurality of side openings 224 and It prevents the biological tissue from being adsorbed and blocked. On the other hand, since the liquid is sucked into each opening through the space (corresponding to the suction space) formed between the wires, the liquid can be sucked without any trouble.

(Modification)
In the second embodiment described above, the opening is not present at the distal end of the tube 22, but it is also possible to have the opening. 10: is a figure which shows the modification of Example 2, FIG. 10A is the schematic of the distal end vicinity of the vent catheter 5 which concerns on this modification, FIG. 10B shows the catheter protector 210 which concerns on this modification. FIG. 10C schematically shows the vicinity of the distal end of the tube 220 according to this modification.

As shown in FIG. 10B, in the catheter protector 210 according to the present modification, the distal end opening isolation part 214 is provided in the threaded part 212b on the distal end side. In addition, the tube 220 according to this modification includes a distal end opening 223. When these are combined as in Example 2, the vent catheter 5 shown in FIG. 10A is formed. With the vent catheter 5 having such a configuration, the liquid can be suctioned from the distal end opening 223 protected by the distal end opening isolation portion 214.

<Example 3>
Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 11 is an explanatory diagram showing the configuration of the vent catheter 9 according to the present embodiment, and FIG. 11A is a schematic diagram showing the vicinity of the distal end of the vent catheter 9. The vent catheter 9 according to the present embodiment has a configuration in which a catheter protector 91 separate from the tube is coupled to the distal end side of the tube 92, and the catheter protector 91 in the coupled state is the opening protection part of the present invention. Corresponds to.

FIG. 11B is a schematic diagram of the catheter protector 91. As shown in FIG. 11B, the catheter protector 91 according to the present embodiment generally includes a suction port protection part 911 composed of a plurality of isolation wires 915, a tubular tube holding part 912 in which the wire is formed into a cylindrical coil shape, and The wire binding portion 913 is configured to bind and hold each wire forming the suction port protection portion 911 at the distal end.

The material of each wire is, for example, stainless steel, but is not limited to this and may be other metal or resin. Alternatively, a metal coated with a resin may be used. However, as will be described later, it is desirable that the isolation wire 915 forming the suction port protection portion 911 and the wire forming the tubular tube holding portion 912 have different elastic limits. Specifically, it is desirable that the isolation wire 915 forming the suction port protection portion 911 has a higher elastic limit than the wire forming the tubular tube holding portion 912.

The suction port protection part 911 arranges and fixes one end of the isolation wire 915 evenly in the circumferential direction on the outer periphery of the tubular tube holding part 912 in the vicinity of the distal end, and folds each wire to the outside. It is formed by binding the other end portion at a distal end substantially coaxial with the central axis of the tubular tube holding portion 912. Therefore, the suction port protection part 911 is curved so that each isolation wire 915 swells with its apex slightly proximal to the center of the distal side and the proximal side, toward the wire binding part 913 at the distal end. It has a structure that narrows. The isolation wire 915 can be fixed to the tubular tube holding portion 912 by a desired known technique such as welding.

The wire binding portion 913 has a configuration in which the distal side of the bundled isolation wires 915 is fixed with, for example, a medical adhesive or the like and covered with a resin cap. The isolation wire 915 may be fixed not only by a medical adhesive but also by welding, or a resin such as a photocurable resin may be used. Further, the covering with the cap is not always indispensable, and as long as the isolation wire 915 can be fixed in a dull shape that does not damage the human body, the cap may not be used.

FIG. 11C is a diagram schematically showing the distal side of the tube 92. The tube 92 is formed of a soft resin (for example, polyvinyl chloride), and a suction opening 921 including a plurality of side surface openings 924 is provided near the distal end.

The inner diameter of the tubular tube holding portion 912 of the catheter protector 91 is formed to be slightly larger than the outer diameter of the tube 92, and the tube 92 can be inserted into the tubular tube holding portion 912 as described later. It is like this.

Next, the connection between the catheter protector 91 and the tube 92 will be described. FIG. 12A is a diagram showing a state in which the catheter protector 91 and the tube 92 are coupled to each other in this embodiment. The white arrow in FIG. 12A represents the relative movement direction of the tube 92. Insert the tube 92 into the tubular tube holding portion 912 of the catheter protector 91 and insert it to the distal side of the catheter protector 91. Thus, it is possible to combine the two.

In addition, the catheter protector 91 and the tube 92 can be more reliably joined by deforming the tubular tube holding portion 912 so as to extend to the proximal side in the joined state. FIG. 12B is a diagram showing a state in which the tubular tube holding portion 912 is extended to the proximal side in a state where the catheter protector 91 and the tube 92 are connected. The white arrow in FIG. 12B indicates the direction in which the tubular tube holding portion 912 is pulled.

The tubular tube holder 912 is made of a material that can be plastically deformed by the force of the user's hand, and when stretched as shown in FIG. 12B, its shape is maintained. As a result, the tube 92 is accommodated in the tubular tube holding portion 912 to the more proximal side (that is, a larger portion of the tube 92 is accommodated in the catheter protector 91), so that the catheter protector 91 and the tube 92 can be more firmly bonded.

FIG. 12C is a diagram showing the vicinity of the distal end of the vent catheter 9 in a state in which the tubular tube holding portion 912 having the tube 92 inserted therein is extended to the proximal side and the vicinity of the distal end of the tube 92 is curved. .. Since the tubular tube holding portion 912 has the above-described properties, when the portion of the tube 92 located inside the tubular tube holding portion 912 is deformed (for example, curved) as shown in FIG. 12C. The tubular tube holding portion 912 is deformed following the deformation of the tube 92 and maintains its shape. Therefore, the user can deform the vicinity of the tip of the vent catheter 9 into a desired shape for use, and improve the operability of the vent catheter 9.

Further, since the vent catheter 9 according to the present embodiment does not have a configuration arranged inside the tube 92, the volume in the tube can be effectively used as a path for suction. Although the tubular tube holding portion 912 is formed by forming the wire into a coil shape, the tubular tube holding portion 912 may have a structure in which, for example, a soft resin cylinder is formed into a bellows.

<Example 4>
Further, the connecting means for connecting the catheter protector and the tube may be provided only on the tube side. FIG. 13 is a diagram illustrating an example in which the coupling means is provided only on the tube side. As shown in FIG. 13A, in the tube 32 according to the present embodiment, the outer diameter of the suction opening 321 is smaller than the outer diameter of the tube 32 on the proximal side of the suction opening 321. In addition, tapered projections are provided as locking portions 322a and 322b on the proximal end side of the suction opening 321.

The catheter protector 31 used in this embodiment has substantially the same configuration as that described in the second embodiment, but the end rings 311a and 311b corresponding to the threaded portion may not have a screw. In addition, the inner diameters of the end rings 311a and 311b are larger than the outer diameter of the suction opening 321 of the tube 32 and smaller than the outer diameter of the suction opening 321 on the proximal end side.

In this embodiment, when connecting the catheter protector 31 and the tube 32, the tube 32 is inserted through the catheter protector 31 as shown in FIGS. The tube 32 is made of a soft resin (for example, polyvinyl chloride), and when inserted, the locking portions 322a, 322b can be distorted inward to allow the proximal end ring 311a of the catheter protector 31 to pass through. ..

As shown in FIG. 13C, the locking portions 322a and 322b are restored to their original shapes after the distal end ring 311a has passed, and the distal end ring 311a or the catheter protector 31 is prevented from falling off toward the distal end side. Further, since the outer diameter of the tube 32 on the proximal side of the suction opening 321 is larger than the inner diameter of the end ring 311a, the catheter protector 31 moves past the suction opening 321 and moves to the proximal end side of the tube 32. Can be prevented.

<Other>
The above description of each example is merely an example of the present invention, and the present invention is not limited to the above specific modes. The present invention can be variously modified and combined within the scope of its technical idea. For example, a hybrid type vent catheter can be constructed by combining the components of the respective embodiments.

FIG. 14 is a diagram showing a hybrid type catheter protector 41 of the catheter protector according to the first embodiment and the catheter protector according to the second embodiment. As shown in FIG. 14, the hybrid type catheter protector 41 has a configuration in which the configuration of the suction port protection portion of the first embodiment and the configuration of the screwing portion of the second embodiment are combined. Although not shown, the catheter protector according to the third embodiment and the tube body according to the fourth embodiment may be combined to form a hybrid-type vent catheter capable of more firmly connecting the both. Further, a part of the distal side of the tubular tube holding portion of the catheter protector according to the third embodiment may be a threaded portion of the catheter protector according to the first or second embodiment.

It is also possible to replace the constituent elements of each embodiment with each other. For example, regarding the configuration of the threaded portion of the catheter protector, the threaded portion of the first embodiment may be a nut, and the threaded portion of the second embodiment may be a coil.

Further, regarding the material of each part constituting the catheter protector, the parts other than those which are clearly shown to be formed of the resin or the metal coated with the resin in each of the above examples are not limited to the metal. Instead, a resin can be adopted. Examples of the resin used include nylon, polyurethane, PTFE (polytetrafluoroethylene) and the like. Further, the entire catheter protector may be integrally molded with resin, and as a method therefor, a known desired method such as a method using a mold or a method using a three-dimensional printer can be used. When each member constituting the catheter protector is individually formed of resin, the members may be fixed to each other with an adhesive or may be fixed by welding.

1, 2, 3, 4, 5, 6, 7, 8... Vent catheter 11, 110, 21, 210, 31, 41, 61, 71, 81, 91... Catheter protector 111, 211, 611, 711, 911... Suction port protecting portions 112, 212a, 212b... Screwing portions 113, 813... Puncturing needle 114... Retaining portions 115, 615, 915... Separation wires 12, 120, 22, 220, 32, 92... Tubes 121, 221, 921... Suction openings 122, 222a, 222b... Threaded portions 123, 223... Distal end openings 124, 224, 924... Side opening 213... Flat wire 214... Distal end opening isolation portions 311a, 311b... End rings 321a, 321b... Locking portion 616... Bending portion 715... Isolation portion 717. ....Wire crossing portion 912... Cylindrical tube holding portion 913... Wire binding portion

Claims (18)

A catheter which is used by being introduced into a body cavity for sucking an object to be sucked containing at least a liquid,
A tube body comprising a cavity communicating the proximal end and the distal end, and an opening communicating the cavity with the outside in the vicinity of the distal end,
An opening protection portion that is provided so as to cover the vicinity of the distal end of the tube body and that prevents the opening from being closed,
The catheter, wherein the opening protection part includes a plurality of shape-remembered isolation parts that isolate the tissue in the body cavity from the opening, and the plurality of isolation parts are provided at a predetermined interval from each other. The catheter according to claim 1, wherein the plurality of isolation portions extend in the longitudinal direction of the tube body and bulge outward in a convex shape. The catheter according to claim 1 or 2, wherein the opening protection part is formed so that the plurality of isolation parts are arranged at equal intervals along a circumferential direction of the tube body. .. The catheter according to any one of claims 1 to 3, wherein the plurality of isolation portions in the opening protection portion are formed of wires. A catheter which is used by being introduced into a body cavity for sucking an object to be sucked containing at least a liquid,
A tube body comprising a cavity communicating the proximal end and the distal end, and an opening communicating the cavity with the outside in the vicinity of the distal end,
An opening protection portion that is provided so as to cover the vicinity of the distal end of the tube body and that prevents the opening from being closed,
The opening protection unit includes a plurality of isolation units that isolate the tissue in the body cavity from the opening, and the plurality of isolation units are provided at a predetermined interval from each other,
Each of the isolation portions includes a bent portion that is convex toward the proximal end side at the proximal end of the opening protection portion,
It features and to Luke catheters that. The isolation portion is formed of a wire,
The bent portion is formed by bending an end portion on the proximal end side of the isolation portion toward the tube body side.
The catheter according to claim 5, characterized in that Each of the plurality of isolation portions is formed by a plurality of wires,
The catheter according to claim 4, wherein each of the isolation portions includes a wire intersection portion in which the plurality of wires intersect in the circumferential direction in the opening protection portion. The said opening is arrange|positioned within 30 mm from the distal end of the said tube main body, and the number is 5 or more and 8 or less, The any one of Claim 1 to 7 characterized by the above-mentioned. catheter. 9. The tube main body and the opening protection part are separate bodies, and the opening protection part and the tube main body are coupled by a coupling means, according to any one of claims 1 to 8. catheter. The tube body is provided with a threaded portion, the opening protection portion further includes a threaded portion that can be threadedly engaged with the threaded portion at least on the proximal end side, and the coupling means includes the threaded portion. The catheter according to claim 9, further comprising: and the threaded portion. The catheter according to claim 10, wherein the threaded portion is formed of a coil. The tube body has an opening at least at a distal end of the tube body,
The opening protective part, by inner walls abutting said cavity by restoring force from the opening in the distal end is accommodated in the hollow portion of the tube body before Symbol tube body is formed so as to elastically deform the retaining portion to prevent dropping off from the tube body, and further comprising a
The catheter according to any one of claims 9 to 11, wherein the coupling means includes the retaining portion. A tube body comprising a cavity communicating the proximal end and the distal end, and an opening communicating the cavity with the outside in the vicinity of the distal end,
A plurality of isolation portions that are provided at predetermined intervals to isolate the tissue in the body cavity from the opening, are provided so as to cover the vicinity of the distal end of the tube body including the opening, and the opening is closed. An opening protection part that prevents
A coupling means for coupling the opening protection part and the tube body,
A catheter that is used by being introduced into a body cavity to aspirate an object to be aspirated containing at least a liquid,
The opening protection portion extends to the proximal end side from the distal end side, located along the center in the lateral direction cross section of the tube body, further comprising, features and to Luke catheters that the puncture needle. A cavity communicating the proximal end and the distal end, and the cavity and the outside in the vicinity of the distal end.
An opening communicating with the tube body,
A plurality of isolation portions that are provided at predetermined intervals to isolate the tissue in the body cavity from the opening, are provided so as to cover the vicinity of the distal end of the tube body including the opening, and the opening is closed. An opening protection part that prevents
A coupling means for coupling the opening protection part and the tube body,
A catheter that is used by being introduced into a body cavity to aspirate an object to be aspirated containing at least a liquid,
The opening protection part, in a state where the opening protection part is coupled to the tube body, comprises a puncture needle of a length extending from the proximal end of the opening protection part in the tube body to the proximal side,
By deforming the puncture needle, the shape of the portion of the tube body on the proximal side of the proximal end of the opening protection portion can be adjusted according to the deformed shape of the puncture needle. It features and be Luke catheters. The opening protection portion further includes a tubular tube holding portion extending toward the proximal end side and having an inner diameter larger than the outer diameter of the tube body,
The coupling means includes the tubular tube holding portion,
By inserting the distal end side of the tube body into the tubular tube holding portion, the tube body and the opening protection portion are coupled.
The catheter according to any one of claims 9 to 14, characterized in that: In a state in which the opening protection part is coupled to the tube body, by plastically deforming the tubular tube holding part, the shape of the portion of the tube body on the proximal side from the proximal end of the opening protection part, The catheter according to claim 15, wherein the catheter is configured to be adjustable according to the deformed shape of the tubular tube holding portion. An object to be aspirated, which includes a cavity that communicates the proximal end and the distal end, and an opening that communicates the cavity with the outside in the vicinity of the distal end and that is introduced into a body cavity and contains at least a liquid. A catheter protector which is used by being coupled by a coupling means to a catheter which sucks from the opening, and which is arranged so as to cover the vicinity of the distal end and prevents the opening from being blocked,
A catheter protector comprising: a plurality of shape-remembered isolating portions for isolating tissue in the body cavity from the opening, the isolating portions being provided at predetermined intervals. An object to be aspirated, which includes a cavity that communicates the proximal end and the distal end, and an opening that communicates the cavity with the outside in the vicinity of the distal end and that is introduced into a body cavity and contains at least a liquid. A catheter protector which is used by being coupled by a coupling means to a catheter which sucks from the opening, and which is arranged so as to cover the vicinity of the distal end and prevents the opening from being blocked,
A plurality of isolation parts for isolating the tissue in the body cavity from the opening, the plurality of isolation parts being provided at a predetermined interval from each other;
The catheter protector, wherein each of the isolation portions includes a bent portion that is convex toward the proximal end side of the catheter at the proximal end of the catheter protector in a state of being coupled to the catheter.

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