JPH08131548A - Catheter for ivr - Google Patents

Abstract

PURPOSE: To display a position in a living body without exposure to X-ray in an ultrasonic wave Doppler diagnosis method using an ultrasonic diagnosis device. CONSTITUTION: A passage 3 of fluid 11 for ultrasonic wave image pickup which returns at a catheter tip part 1a is provided in the axial direction of an insertion part 2, so the fluid 11 is circulated from the first half 3a of the passage 3 through the tip part 1a, the second half 3b, the first half 3a,..., when desired.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention is used in the field of radiology, and is used for puncturing a lesion, performing a biopsy, or performing treatment or diagnosis under a real-time display image.
The present invention relates to a catheter for (Interventional radiology), and more particularly, to a catheter for IVR in which the position inside a blood vessel of a living body can be displayed by using ultrasonic waves and the exposure for position display is eliminated.

[0002]

2. Description of the Related Art In a conventional IVR catheter, when performing puncture, biopsy, treatment, or diagnosis of a lesion under a real-time display image using the catheter, fluoroscopic imaging is performed using an X-ray device. X from the tip of the catheter inserted into the blood vessel
The above-mentioned X in which a contrast agent having a high linear absorption rate (X-ray contrast agent) is intermittently or continuously poured into the blood vessel, and is poured into the blood vessel.
The state of the blood vessel and the position of the catheter (insertion portion) are displayed as an image by the difference in the X-ray absorption rate between the linear contrast agent and the living body (blood vessel).

[0003]

As described above, the conventional I
With VR catheters, avoiding X-ray exposure in displaying the position of the catheter (insertion part) when puncturing a lesion under a real-time display image by a doctor, biopsy, or performing treatment or diagnosis through the catheter. There was a problem that I could not do it.

An object of the present invention is to provide an IVR catheter capable of displaying a position in a living body without being exposed to X-rays.

[0005]

The above object is achieved by constructing an IVR catheter by providing a flow path of an ultrasonically contrastable fluid that is folded back at the distal end portion in the axial direction of the insertion portion.

[0006]

The IVR catheter thus constructed is
A fluid capable of ultrasound contrast can be circulated in the channel. Therefore, when such an IVR catheter (insertion part) is inserted into a blood vessel, an ultrasonic diagnostic apparatus is used for the catheter (insertion part) with a fluid capable of ultrasound contrast being circulated in the channel. Apply ultrasonic Doppler diagnostic method,
By performing the operation, the position of the catheter (insertion portion) can be displayed as a fluid flow portion capable of in-vivo ultrasound imaging.

For example, by making the flow velocity of the fluid in the flow path different from the blood flow velocity in the blood vessel, the blood flow in the blood vessel and the flow of the ultrasound contrastable fluid can be distinguished by the ultrasonic Doppler diagnostic method. By performing color flow map display and M mode display in the ultrasonic Doppler diagnostic method using the diagnostic apparatus, the position of the catheter (insertion portion) can be easily displayed without X-ray exposure. At this time, since the flow path is folded back at the tip, the flow direction of the ultrasonic contrast-enable fluid is reversed at the tip, and the tip of the IVR catheter inserted into the blood vessel is displayed. Be clear.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged side view showing an essential part of an embodiment of an IVR catheter according to the present invention, FIG. 2 is a side view showing an outline of an overall configuration example of the inventive catheter shown in FIG. 1, and FIG. It is explanatory drawing of the use condition of the catheter of this invention shown in FIG.

According to the present invention, as shown in FIG. 1, an ultrasonically contrastable fluid flow path is formed by folding back at the distal end of the catheter inside the thick wall of the insertion portion 2 of the catheter 1.
For example, the pipe 3 is embedded and arranged.

The pipe 3 is provided parallel to the axial direction of the insertion section 2 (left-right direction in the figure) over the entire length of the forward path 3a and the return path 3b, but at the catheter distal end portion 1a, the catheter distal end surface 4 is provided. It is formed so as to wrap around once around the axis of the insertion portion 2 while being kept parallel to, and then folded back. Therefore, when the fluid is supplied into the pipe 3 in the direction of arrow a, the fluid flows as arrow a → arrow b → arrow c → arrow d.

Next, referring to FIG. 2, an example of the overall construction of the catheter of the present invention will be described. The catheter 1 of the present invention includes an insertion portion 2, a gate 5 for inhaling and exhaling a catheter lumen,
The operating section 6 of the insertion section 2, the operating section adapter 8, the operating section adapter 8 and the junction 7 of the gate 5 for suction and discharge of the catheter lumen are provided. Further, the insertion portion 2 is provided with the pipe 3 as described above, and the pipe 3 is drawn out of the catheter 1 from the operation portion adapter 8 portion, and the ultrasonic contrastable fluid 11 is provided therein by the pump 10. Are circulated.

Here, as the fluid 11, it is easy to detect the fluid 11 by applying an ultrasonic Doppler diagnostic method using an ultrasonic diagnostic apparatus, for example, SA (Sonicated albu).
min) and other ultrasound Doppler diagnostic contrast agents are used.

Such a catheter of the present invention is used as follows when a doctor or the like performs puncture of a lesion under a real-time display image, biopsy, or treatment or diagnosis via a catheter as follows. The position of the insertion part in the inside is displayed.

1 to 3, it is assumed that the insertion portion 2 is inserted into the blood vessel 31 and the fluid 11 circulates in the pipe 3. In this case, since the flow of the fluid 11 in the pipe 3 in the insertion section 2 is a steady flow, ultrasonic waves are transmitted and received by the ultrasonic probe 32 from the surface of the living body, and ultrasonic Doppler wave is detected using the ultrasonic diagnostic apparatus. This steady flow can be traced (see arrow E in FIG. 3) by applying and implementing the diagnostic method. By this tracking, tracking and display of the position of the catheter 1 (insertion section 2) in the blood vessel 31 is performed by the ultrasonic diagnostic apparatus, that is, without X-ray exposure. Further, the tracking and display of the position of the catheter 1 (insertion section 2) is, in other words, the display of the running state of the blood vessel 31.

In the example shown in FIGS. 1 and 2, the fluid 11 flows from the catheter insertion source 1b to the catheter distal end portion 1a, and is folded back around the insertion portion axis around the insertion portion axial direction in the distal end portion 1a. The flow returns to (see arrows a to d). According to this, the approximate circulating flow of the fluid 11 perpendicular to the axial direction of the insertion portion is given to the catheter tip 1a, and there is an advantage that the position of the catheter tip 1a can be easily displayed.

In FIG. 4, the pipe 3 for flowing the fluid 11 into the thick wall portion of the insertion portion 2 of the catheter 1 is connected to one of the outward path 3a to the catheter tip 1a and the return path 3b from the catheter tip 1a, here. An example is shown in which the outward path 3a is spirally wound around the axis of the insertion section 2 while the return path 3b is formed parallel to the axial direction of the insertion section 2.

In such a configuration example, the fluid 11 spirally swirls and flows from the catheter insertion source 1b toward the catheter tip 1a, and after being folded back at the catheter tip 1a, inserted toward the catheter insertion source 1b. The flow returns parallel to the axial direction. According to this, since the linear flow 41 of the fluid 11 and the flow 42 that obliquely intersects the linear flow 41 are generated, it becomes easy to recognize the position of the base point 43 of the catheter tip 1a and the position of the catheter tip 1a. Has the advantage of facilitating display.

FIG. 5 shows a pipe 3 for flowing a fluid 11 in the thick wall portion of the insertion portion 2 of the catheter 1, both the forward path 3a to the catheter tip 1a and the return path 3b from the catheter tip 1a. An example is shown in which the circuit is spirally wound in the circumferential direction, and the traveling directions 51 and 52 of the outward path 3a and the return path 3b are formed in the same direction.

In such a configuration example, the fluid 11 spirally swirls from the catheter insertion source 1b toward the catheter tip 1a, and swirls spirally after being folded back at the catheter tip 1a to insert the catheter. The flow returns to the source 1b, and the flow toward the catheter tip 1a and the flow toward the catheter insertion source 1b have the same turning direction (circulation in the same direction). According to this, the fluid 11
When a steady flow in the catheter 1 is measured from a certain direction, the blood vessel (= catheter) bends, for example, the interval l between the measurement points p1, p2, ...
See a≈lb ≠ lc). By measuring this state, there is an advantage that the curved state can be measured.

FIG. 7 shows a pipe 3 for flowing a fluid 11 in the thick wall portion of the insertion portion 2 of the catheter 1, both the outward path 3a to the catheter tip 1a and the return path 3b from the catheter tip 1a. An example is shown in which the circuit is spirally wound in the circumferential direction, and the circumferential directions 71 and 72 of the outward path 3a and the return path 3b are formed in opposite directions.

In such a configuration example, the fluid 11 spirally swirls from the catheter insertion source 1b toward the catheter tip 1a, and swirls spirally after being folded back at the catheter tip 1a to insert the catheter. The flow returns to the source 1b, and the direction of the flow toward the catheter tip 1a and the direction of the flow toward the catheter insertion source 1b are opposite (circulation in the opposite direction). According to this, since the directions 81 and 82 of the flow of the fluid 11 in the catheter 1 can be detected alternately, it can be used to measure the axial length lp ... In the living body (blood vessel). There are advantages (see FIG. 8).

FIG. 9 shows a pipe 3 through which the fluid 11 flows in the thick wall portion of the insertion portion 2 of the catheter 1, both the outward path 3a to the catheter tip 1a and the return path 3b from the catheter tip 1a. An example formed in parallel with the direction is shown.

In such a configuration example, the fluid 11 flows from the catheter insertion source 1b toward the catheter tip portion 1a in parallel to the insertion portion axial direction, and even after being folded back at the catheter tip portion 1a, it is parallel to the insertion portion axial direction. Catheter insertion source 1b
The flow returns toward (see arrows 91 to 93). This has the advantage of the simplest configuration.

[0024]

As described above, according to the present invention, it is possible to display the position of the insertion part in the living body by the ultrasonic Doppler diagnostic method using the ultrasonic diagnostic apparatus, that is, without X-ray exposure. Compared with the IVR catheter position display by X-ray fluoroscopy, X-ray exposure of doctors and patients can be greatly reduced, and highly safe lesion puncture, biopsy, or treatment and diagnosis are possible. There is an effect.

[Brief description of drawings]

FIG. 1 is an enlarged side view showing a main part of an embodiment of an IVR catheter according to the present invention.

FIG. 2 is a side view showing the outline of an example of the overall configuration of the catheter of the present invention shown in FIG.

FIG. 3 is an explanatory view of a usage state of the catheter of the present invention shown in FIG.

FIG. 4 is a side view showing an enlarged main part of another embodiment of the catheter of the present invention.

FIG. 5 is a side view showing an enlarged main part of another embodiment of the catheter of the present invention.

6 is an explanatory view of advantages of the catheter of the present invention shown in FIG.

FIG. 7 is a side view showing an enlarged main part of another embodiment of the catheter of the present invention.

FIG. 8 is an explanatory view of advantages of the catheter of the present invention shown in FIG. 7.

FIG. 9 is a side view showing an enlarged main part of another embodiment of the catheter of the present invention.

[Explanation of symbols]

 1 Catheter of the present invention 1a Catheter tip 1b Catheter insertion source 2 Insertion part 3 Pipe (flow path of ultrasonically contrastable fluid) 3a Pipe forward path 3b Pipe return path 4 Catheter tip surface 5 Catheter lumen suction / discharge gate 6 Operation part 7 Junction 8 Operation part adapter 10 Pump 11 Ultrasonic contrastable fluid 31 Blood vessel 32 Ultrasonic probe

Claims (6)

[Claims] 1. An IV comprising a flow path of an ultrasonic contrastable fluid that is folded back at the tip end portion in the axial direction of the insertion portion.
R catheter. 2. The I according to claim 1, wherein the flow path has a distal end portion which circulates in a direction around an insertion portion axis.
VR catheter. 3. The flow path is characterized in that one of a forward path to the distal end portion and a return path from the distal end portion spirally circulates in the axial direction around the insertion portion, and the other is parallel to the axial direction of the insertion portion. The catheter for IVR according to claim 1. 4. The flow path spirally circulates in a direction around the axis of the insertion portion both on the outward path to the distal end portion and on the return path from the distal end portion,
The catheter for IVR according to claim 1, wherein the outward direction and the return direction are in the same direction. 5. The flow path spirally circulates in a direction around the axis of the insertion portion both on the outward path to the distal end and on the return path from the distal end,
The IVR catheter according to claim 1, wherein the forward and backward directions are opposite to each other. 6. The IVR catheter according to claim 1, wherein the flow path is parallel to the axial direction of the insertion section both in the forward path to the distal end and in the return path from the distal end.