JP2020054410A - Image diagnosis catheter - Google Patents

Abstract

To provide an image diagnosis catheter that is easy to hold and is capable of reducing a workload.SOLUTION: An image diagnosis catheter 100 comprises a catheter shaft 110 and a branch section 120 provided for a base end thereof. The catheter shaft is provided with a guide wire lumen 113, into which a guide wire W is freely insertable, and accommodates a drive shaft 114, which is separated from the guide wire lumen, so as to be freely movable forward/backward. The branch section branches into two parts at the base end of the catheter shaft, with an insertion opening 122 communicating with the guide wire lumen being formed for a branch destination 121 of one of the two parts, and a base end side of the drive shaft extending to a branch destination 123 of the other of the two parts. Also, the image diagnosis catheter comprises a handle 160 at the branch section.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a catheter for diagnostic imaging.

  2. Description of the Related Art Conventionally, techniques for obtaining a tomographic image of a blood vessel or the like using an image diagnostic catheter such as IVUS (intravascular ultrasound diagnosis) and OCT / OFDI (optical coherence tomography diagnosis) have been performed (for example, see Patent Document 1).

JP 2015-181788 A

  The diagnostic imaging catheter is used with a guidewire inserted therethrough to adjust the relative position between the guidewire and the diagnostic imaging catheter in a living body lumen such as a blood vessel, or to insert the guidewire into the diagnostic imaging catheter. -When removing, the operator grasps them and moves them relatively. For this reason, if the diagnostic imaging catheter is easily held, the operation burden on the operator can be further reduced.

  Therefore, an object of the present invention is to provide a diagnostic imaging catheter that can be easily held and reduce the work load.

  An image diagnostic catheter of the present invention for achieving the above object has a catheter shaft and a branch provided at a proximal end thereof. The catheter shaft is provided with a guidewire lumen through which a guidewire can be inserted, and a drive shaft is accommodated in the catheter shaft so as to be able to advance and retreat apart from the guidewire lumen. The bifurcated portion is bifurcated at the proximal end of the catheter shaft, an insertion port communicating with the guidewire lumen is formed at one bifurcation branch, and a drive shaft is formed at the other bifurcation branch. The proximal side extends. The catheter for diagnostic imaging of the present invention has a handle at a branch portion.

  According to the catheter for diagnostic imaging having the above configuration, the handle is provided and is easy to hold when operating the guide wire, so that the operation burden on the operator can be reduced.

It is a figure showing the catheter for image diagnosis of a 1st embodiment. It is a figure showing an important section of a catheter for image diagnosis of a 2nd embodiment. It is a figure showing an important section of a catheter for image diagnosis of a modification. It is a figure which shows the principal part of the catheter for an image diagnosis of another modification. It is a figure which shows the principal part of the catheter for image diagnostics of another modification.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are exaggerated for the sake of explanation, and are different from the actual ratios.

<First embodiment>
As shown in FIG. 1, the diagnostic imaging catheter 100 according to the first embodiment includes a catheter shaft 110, a branch portion 120, an outer tube 130, an inner tube 140, a hub 150, and a handle 160.

  The catheter shaft 110 has flexibility and is inserted into a body lumen such as a blood vessel. The catheter shaft 110 has a sheath 111 and a sheath 112 which are arranged side by side in parallel with each other and integrated. The sheath 111 is provided with a guide wire lumen 113 through which the guide wire W can be inserted. The drive shaft 114 is accommodated in the sheath 112 so as to be able to advance and retreat apart from the guide wire lumen 113.

  The material for forming the sheath 111 and the sheath 112 is not particularly limited. For example, styrene, polyolefin, polyurethane, polyester, polyamide, polyimide, polybutadiene, trans polyisoprene, fluoro rubber, chlorinated Examples include various thermoplastic elastomers such as polyethylene, and one or a combination of two or more of these (polymer alloys, polymer blends, laminates, etc.) may be used.

  The guide wire W has flexibility and X-ray contrast, and is formed of, for example, a superelastic alloy such as stainless steel, spring steel, titanium, tungsten, tantalum, and a nickel-titanium alloy.

  The drive shaft 114 drives the signal transmitting / receiving unit 115 provided at the distal end of the drive shaft 114 to transmit and receive signals to and from a living body lumen along the axial direction or to rotate around the axial direction. From the base end side, and is flexible and has appropriate rigidity. The drive shaft 114 also serves to transmit a signal to the signal transmitting / receiving unit 115 and to transmit a signal from the signal transmitting / receiving unit 115 to the base end side.

  The configurations of the drive shaft 114 and the signal transmission / reception unit 115 can be appropriately designed according to the form of the diagnostic imaging catheter 100. For example, when the image diagnostic catheter 100 is a catheter for IVUS (intravascular ultrasonic diagnosis), the drive shaft 114 transmits an electric signal, and the signal transmitting / receiving unit 115 transmits and receives an ultrasonic wave as a signal. In contrast, when the image diagnostic catheter 100 is an OCT / OFDI (optical coherence tomography) catheter, the drive shaft 114 transmits light, and the signal transmitting / receiving unit 115 transmits and receives light as a signal. Further, the catheter for image diagnosis 100 may use both ultrasonic waves and light as signals.

  The branch portion 120 is provided at the proximal end of the catheter shaft 110 and branches into two branches. An insertion port 122 communicating with the guide wire lumen 113 is formed at one of the two branches, and the base end of the drive shaft 114 extends at the other branch 123.

  Through the insertion port 122, the surgeon inserts the guide wire W into the guide wire lumen 113 or removes the guide wire W from the guide wire lumen 113. As long as the guide wire W can be inserted, another device such as a Y connector may be detachable from the branch destination 121.

  A drive shaft 114 further extends from the branch destination 123 and is connected to a hub 150 through an outer tube 130 and an inner tube 140. The distal end side of the outer tube 130 is fixed to the branch destination 123. An inner tube 140 is inserted into the base end of the outer tube 130 so that it can be taken in and out, and a hub 150 is fixed to the base end of the inner tube 140. The hub 150 connects to a motor drive unit (MDU).

  The motor drive unit (MDU) moves the hub 150 forward and backward, and accordingly, the drive shaft 114 moves forward and backward in the axial direction. The motor drive unit (MDU) rotates the drive shaft 114 around the axial direction. The signal transmission / reception unit 115 advances and retreats and rotates similarly to the drive shaft 114.

  When obtaining a tomographic image of a living body lumen, the signal transmission / reception unit 115 moves to the proximal end in the axial direction while rotating with the drive shaft 114 while transmitting and receiving signals to and from the living body lumen.

  The handle 160 is provided to protrude from the branch part 120. In the present embodiment, the handle 160 is provided at two places so as to protrude in opposite directions. However, the handle 160 may be provided at only one of them, or in addition to these two places, May also be provided at the location. In the present embodiment, the handle 160 has a shape like a wing, but the shape is not limited to this.

  Next, the operation and effect of this embodiment will be described.

  The diagnostic imaging catheter 100 is used with a guidewire W inserted therethrough, and the catheter shaft 110 is advanced to a target position in the living body lumen along the guidewire W that precedes the living body lumen.

  The operator adjusts the relative position between the catheter shaft 110 and the guide wire W in the body lumen by grasping and moving the image diagnostic catheter 100 and the guide wire W relative to each other outside the body. The guide wire W is inserted into and removed from the diagnostic imaging catheter 100 for wire replacement.

  In this embodiment, since the handle 160 is provided, the operator can easily hold the diagnostic imaging catheter 100 by attaching a hand to the handle 160 in such an operation. Therefore, the operator's work load can be reduced.

  In particular, since the handle 160 is provided in the branch portion 120 and is close to the insertion port 122, it is easy to stabilize the insertion port 122 so that the insertion port 122 is not shaken by attaching a hand to the handle 160, and the operation of the guide wire W is easy. It is.

<Second embodiment>
As shown in FIG. 2, the catheter 200 for diagnostic imaging of the second embodiment is provided with a handle 260 different from that of the first embodiment, and a guide wire W is fastened thereto. Regarding other configurations, the second embodiment is the same as the first embodiment, and the same components are denoted by the same reference numerals, and redundant description will be omitted.

  The handle 260 has a base 261 and a hook 262 (clasp). The base 261 is a flat plate-shaped component, and is provided so as to protrude from the branch part 120. The hook 262 protrudes substantially perpendicularly from the surface of the base 261 and is bent at a substantially right angle toward the branch portion 120.

  The guide wire W is folded back so that the base end side protruding from the insertion port 122 is curved, and is hooked and retained inside the hook 262 by using the elasticity of returning to the original state from the curved state.

  Unlike the present embodiment, when the guide wire W is not fastened and merely comes out of the insertion port 122, when the operator operates the diagnostic imaging catheter 200 and performs a procedure, the insertion port 122 The guide wire W coming out of the container may be violent and come into contact with unsanitized objects that have not been disinfected.

  On the other hand, in the present embodiment, since the guide wire W is fixed to the hook 262, the guide wire W is prevented from violently coming into contact with the unclean material during the procedure, and the guide wire W is maintained in a clean state. Easy to do.

  Further, in the present embodiment, the guide wire W is not simply fastened, but the base end side is folded back to the front end side and fastened.

  Therefore, the guide wire W protruding from the insertion port 122 does not hinder the surgeon performing the procedure from the base end side of the branch destination 121, and the procedure can be smoothly performed.

  The specific operation and effect provided by the hook 262 (fastening portion) are different from those of the first embodiment. However, regarding other operation and effects, the handle 260 is different from the handle 160 of the first embodiment. It is almost the same.

  The present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the claims.

  For example, the shape of the handle is not limited to the above-described embodiment. For example, the shape of the handle may be a hole with a hole like a handle 160A shown in FIG. 3, or may be a shape like a handle 160B shown in FIG. , An arc shape. If a hole is formed like the handle 160A, it becomes possible to fix the diagnostic imaging catheter and other devices through a thread or the like, and they can be moved simultaneously.

  The handle is provided so as to protrude from the branch portion, but the direction in which the handle protrudes is not limited to the above embodiment. For example, like the handle 160C shown in FIG. 5, the handle 160 of the first embodiment may project in a direction substantially perpendicular to the direction in which the handle 160 projects. In the modified examples shown in FIGS. 3 to 5, the configuration other than the handle is the same as in the first embodiment, and is denoted by the same reference numeral as in the first embodiment.

  Further, the fastening portion for fastening the guide wire is not limited to the hook 262 as in the second embodiment. For example, a slit-like groove substantially parallel to the axial direction of the catheter shaft 110 is provided as a fastening portion on the base portion 261 of the second embodiment, and the folded proximal end side of the guide wire W is fitted into the groove and fastened. You may do so.

100, 200 catheter for diagnostic imaging,
110 catheter shaft,
111 sheath for guide wire,
112 sheath for drive shaft,
113 guidewire lumen,
114 drive shaft,
115 signal transmission / reception unit,
120 branch,
121 One branch destination,
122 guide wire insertion port,
123 The other branch destination,
130 outer tube,
140 inner tube,
150 hubs,
160, 160A, 160B, 160C, 260 handle,
261 base,
262 hook (clasp),
W guidewire.

Claims (2)

A guidewire lumen is provided through which a guidewire can be inserted, and a catheter shaft in which a drive shaft is housed so as to be able to advance and retreat, separated from the guidewire lumen,
A bifurcated branch at the base end of the catheter shaft, an insertion port communicating with the guide wire lumen is formed at one branch of the bifurcated shaft, and a base of the drive shaft is formed at the other branch of the bifurcated branch. A branch portion extending at the end,
And a handle provided at the branch portion.   The handle is provided with a retaining portion for retaining the guide wire, and the proximal end side of the guide wire coming out of the insertion opening is folded back so as to be curved and retained on the retaining portion. Item 7. The diagnostic imaging catheter according to Item 1.