JP6748185B2 - catheter - Google Patents

Description

The present invention relates to a catheter used by being inserted into a body cavity such as a blood vessel and a blood vessel.

It is desirable to provide the ultrasonic detector at the tip of the ultrasonic catheter as much as possible in order to minimize the insertion of the catheter into the living body. Therefore, the guide wire lumen provided at the tip side of the ultrasonic detector is desirable. Must necessarily have a reduced axial length. However, if the length of the guide wire lumen in the axial direction is shortened, the operability will be deteriorated, and the catheter will not move along the guide wire as expected.

In view of such a problem, the ultrasonic catheter disclosed in Patent Document 1 has an observation section used for in-vivo observation and a lumen for the observation section in which the observation section is disposed and which is extended in the in-vivo insertion direction. And a first guide wire lumen, which is provided substantially parallel to the observation section lumen and on the distal side in the in-vivo insertion direction with respect to the observation section, and through which a guide wire that has reached the living body in advance is inserted. A second guide wire lumen, which is provided on the extension line of the wire lumen and on the rear end side in the in-vivo insertion direction with respect to the observation part, and through which the guide wire is inserted.

JP 2004-97286 A

When performing priming in the ultrasonic catheter of the cited document 1, the transducer unit moves to the outlet side, but if the movement proceeds as it is, the transducer unit blocks the outlet, and the ultrasonic transmission liquid ( Hereinafter, since the priming liquid) is not discharged from the discharge port, priming may not be performed normally. Therefore, the present invention provides a catheter that can perform priming normally in consideration of such problems.

In order to achieve the object of the present invention, for example, the catheter according to the first aspect of the present invention has the above-mentioned structure as a flow path for guiding the ultrasonic transmission fluid filled inside the lumen of the catheter sheath into the priming port. The priming port is provided with another flow channel different from the flow channel that can be dammed by the body cavity observation unit that can move inside the lumen of the catheter sheath in the axial direction of the catheter sheath.

Further, in order to achieve the object of the present invention, for example, a catheter according to a second aspect of the present invention is characterized in that the catheter is provided in a body cavity observation section that can move inside the lumen of the catheter sheath in the axial direction of the catheter sheath. A first path that communicates between openings that are not blocked by the priming port provided when the priming port is provided inside the lumen of the sheath, and the inside of the lumen of the catheter sheath communicates with the first path. And a second path for performing the observation of the inside of the body cavity.

According to the present invention, it is possible to provide a catheter that can perform priming normally.

Other features and advantages of the present invention will be apparent from the following description with reference to the accompanying drawings. Note that, in the accompanying drawings, the same or similar configurations are denoted by the same reference numerals.

The accompanying drawings are included in and constitute a part of the specification, illustrate the embodiments of the present invention, and together with the description, serve to explain the principles of the present invention.
The figure which shows the front-end|tip part of the catheter sheath 101. FIG. The figure explaining the inside of the lumen of the catheter sheath 101. The figure explaining the priming port 299 which concerns on 1st Embodiment. The figure explaining the effect of the priming port 299 which concerns on 1st Embodiment. The figure explaining the other example of the priming port 299. The figure explaining the other example of the priming port 299. The figure explaining the other example of the priming port 299. The figure explaining the other example of the priming port 299. The figure explaining resin object 212a concerning a 2nd embodiment. The figure explaining the other example of the resin object 212a. The figure explaining the problem in case the priming port 299 is a cylindrical thing.

Hereinafter, one of preferred embodiments of the present invention will be described with reference to the accompanying drawings. An example in which the present invention is applied to an ultrasonic catheter will be described below, but the application of the present invention is not limited to this. For example, it is obvious to those skilled in the art that the present invention is applicable to catheters used for OCT and OFDI.

[First Embodiment]
The catheter according to the present embodiment includes a long catheter sheath that is inserted into a blood vessel, and a connector that is not inserted into the blood vessel for the user to operate and that is disposed on the user's hand side. As shown in FIG. 1, a guide wire lumen 111 is formed at the tip of the catheter sheath 101. The guide wire lumen 111 has a hole into which a guide wire can be inserted. The guide wire is inserted into the body cavity in advance and used to guide the catheter sheath 101 to the affected area.

As shown in FIG. 2, an ultrasonic transducer 212 for transmitting and receiving ultrasonic waves and a drive shaft 202 for transmitting a driving force for rotating the ultrasonic transducer 212 are provided inside the lumen of the catheter sheath 101. The imaging core 203 is inserted over almost the entire length of the catheter sheath 101. Ultrasonic waves are transmitted from the ultrasonic transducer 212 toward the tissue inside the body cavity, and the ultrasonic transducer 212 receives the reflected wave from the tissue inside the body cavity. In addition, the tip of the imaging core 203 (one end on the insertion direction into the blood vessel) has a hemispherical resin object 212a in order to reduce friction between the tip of the imaging core 203 and the wall surface of the blood vessel during insertion into the blood vessel. Is provided.

The drive shaft 202 is formed in a coil shape, a signal line is arranged inside the drive shaft 202, and extends from the ultrasonic transducer 212 to the connector. The ultrasonic vibrator 212 has a rectangular shape or a circular shape, and is formed by depositing electrodes on both surfaces of a piezoelectric material such as PZT. The ultrasonic transducer 212 is installed so as to be located near the center in the rotation axis direction so that the drive shaft 202 does not cause uneven rotation. The drive shaft 202 is rotatable and slidable with respect to the catheter sheath 101, is flexible, and has the characteristic of being able to securely transmit the rotation of the proximal side to the tip, and is made of, for example, a metal wire such as stainless steel. It is composed of a multi-layered multilayer contact coil and the like. The rotation of the drive shaft 202 makes it possible to observe the inside of the lumen by 360 degrees, but to observe a wider area, the drive shaft 202 may be slid in the axial direction.

A priming port 299 is provided inside the lumen of the catheter sheath 101 (one end on the insertion direction side into the blood vessel), and the priming liquid filled in the catheter sheath 101 is exposed through the priming port 299 by the priming operation. Is discharged to.

Here, at the time of priming, the imaging core 203 moves in the direction of the arrow in the figure (the insertion direction in the blood vessel along the axial direction of the catheter sheath 101), and eventually the resin object 212a reaches the priming port 299. .. If the priming port 299 has a cylindrical shape, the resin object 212a will block the flow path of the ultrasonic wave transmitting liquid as shown in FIG. 8, and as a result, the priming liquid will not be discharged to the outside and, for example, bubbles will be generated. May not be satisfactorily primed, for example, may not be discharged outside. Therefore, in the present embodiment, as shown in FIG. 3, the priming port 299 is partially cut at a rear stage side in the blood vessel insertion direction by a plane that is not parallel to the plane orthogonal to the axial direction of the catheter sheath 101. The priming port 299 is configured to have. By configuring the priming port 299 in this way, as shown in FIG. 4, even when the resin object 212a reaches the priming port 299, the portion indicated by 900 is not blocked by the resin object 212a, and the priming liquid A flow path can be secured.

In addition, as a flow path for guiding the ultrasonic transmission fluid filled in the lumen of the catheter sheath into the priming port, a body cavity observation unit movable in the lumen of the catheter sheath in the axial direction of the catheter sheath is used. As long as another flow channel different from the damable flow channel can be provided, the flow channel configuration method is not limited to the configuration method shown in FIG. 3, and for example, the flow channel shown in FIGS. A method of constructing the road may be adopted.

The priming port 299 shown in FIG. 5A is configured so that the rear stage side of the priming port 299 in the direction of insertion into the blood vessel has a cross section cut by a plane that is non-parallel to the plane orthogonal to the axial direction of the catheter sheath 101. ing.

The priming port 299 shown in FIG. 5B is provided with one notch (slit) communicating with the inside and outside of the priming port 299 on the rear stage side in the blood vessel insertion direction of the priming port 299.

In the priming port 299 shown in FIG. 5C, two notches (slits) communicating with the inside and outside of the priming port 299 are provided on the rear side of the priming port 299 in the direction of insertion into the blood vessel. ing.

In the priming port 299 shown in FIG. 5D, two notches (slits) communicating with the inside and outside of the priming port 299 are located on the rear side of the priming port 299 in the direction of insertion into the blood vessel and are orthogonal to the axial direction of the priming port 299. It is provided in two directions, one direction from the center of the cross section (circle) and two directions different from the direction by 90 degrees.

It should be noted that the present embodiment has the same effect even if the resin object 212a is not provided at the tip of the imaging core 203.

[Second Embodiment]
In the first embodiment, a flow path capable of discharging the priming liquid to the outside even when the priming port 299 and the resin object 212a contact each other is provided on the priming port 299 side. However, a flow path that allows the priming liquid to be discharged to the outside even when the priming port 299 and the resin object 212a contact each other may be provided on the resin object 212a side. For example, as shown in FIG. 6, a path (axial path) along the axial direction (direction indicated by an arrow) of the catheter sheath 101, and a path (a path communicating with the path and orthogonal to the path) to the resin object 212a ( And a left-right direction path). However, the condition is that the distance between the ends (left and right openings) of the left-right path is larger than the inner diameter of the priming port 299. If the resin object 212a is provided with an axial path and a left-right path so as to satisfy such a condition, even if the priming port 299 and the resin object 212a come into contact with each other, the priming liquid will flow from the left-right path. It can be discharged to the outside via an axial path.

In addition, as shown in FIG. 7, a path 701 (axial path) along the axial direction of the catheter sheath 101 is provided in the resin object 212a, and the ultrasonic transducer 212 extends from the rear end portion in the intravascular insertion direction to the axis. A route 702 (rear end route) communicating with the directional route may be provided. In this case, even if the priming port 299 and the resin object 212a are in contact with each other, the priming liquid can be discharged from the path 702 to the outside via the path 701.

In the body-cavity observation part that can move inside the lumen of the catheter sheath in the axial direction, it is not blocked by the priming port at the time of contact with the priming port provided inside the lumen of the catheter sheath. Any body cavity observation section may be adopted as long as it is a body cavity observation section provided with a path communicating between the openings and a path communicating from the inside of the lumen of the catheter sheath to the path.

The present invention is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, in order to make the scope of the present invention public, the following claims are attached.

This application claims priority on the basis of Japanese patent application Japanese Patent Application No. 2016-040418 filed on Mar. 2, 2016, and the entire contents of the description are incorporated herein.

Claims (4)

As a flow path for guiding the ultrasonic wave transmission liquid filled in the lumen of the catheter sheath into the priming port, it is stopped by a body cavity observation unit movable in the lumen of the catheter sheath in the axial direction of the catheter sheath. A catheter having the priming port provided with another flow path different from a possible flow path. The catheter according to claim 1, wherein the priming port has a cross section cut on the rear stage side in the in-vivo insertion direction by a plane that is non-parallel to the plane orthogonal to the axial direction. The catheter according to claim 1, wherein the priming port is provided with one or more notches that communicate with the inside and outside of the priming port on the rear stage side in the body insertion direction. An opening in the body cavity observation part that is movable in the lumen of the catheter sheath in the axial direction of the catheter sheath and is not blocked by the priming port when contacting with the priming port provided inside the lumen of the catheter sheath. A catheter having the above-mentioned body cavity observation part, which is provided with a first path communicating with each other and a second path communicating with the inside of the lumen of the catheter sheath to the first path.

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