JPS62253079A - Multipurpose catheter for blood vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a vascular catheter that can be used for multiple purposes. By bending the catheter, we provide a catheter that can be easily, safely, and reliably introduced not only to all primary divisions of the aorta, but also to its secondary and secondary branches, making it an important medical aid. used in the field.

[Prior art] In order to selectively introduce the catheter from the aorta into the primary branch, which branches into the head, chest, pelvis, extremities, etc., or layer-selectively into the secondary branch, the tip of the catheter is Catheters with various bends have been developed to suit different purposes. The catheter shown in FIG. 3 is one example.

[Problems to be Solved by the Invention] Conventionally developed catheters have unique bends at their tips, depending on the purpose, in order to make it easier to introduce the catheter into the target artery. . Therefore,
In many cases, it is difficult to introduce a catheter into an artery other than the intended purpose, and it is necessary to have a variety of catheters for each purpose.

Furthermore, as shown in FIG. 3, the bending section of a conventional catheter is usually composed of a plurality of bending points. For example, it is difficult for the operating side's rotational force or pushing or pulling force to be transmitted directly to the tip of the catheter, and to introduce the catheter deeper into the target artery requires not only advanced techniques but also multiple In some cases, the bending point of the catheter became an obstacle, making it difficult to insert the catheter into the artery.

Although catheters with only one bending point have been developed, they are all intended to be introduced into the primary branch of the aorta, and the length from the bending point to the tip of the catheter is approximately 25 fflO or more. In some cases, the area from the bending point to the tip is arc-shaped with the tip pointing downward, or the bending point is a gentle bend, resulting in secondary branching.
The angle of the bend, the length from the bend point to the tip, and the gentle bend can actually get in the way of advancing the catheter into the tertiary bifurcation, creating problems in terms of operability and safety.

[Means for Solving the Problems] This invention was made in view of the above problems, and by bending a straight catheter within a range of 30° to 90° within a range of 12 mm or less from the tip, This makes it possible to easily, safely, and reliably introduce a catheter into all target branches of the aorta, and to allow the catheter to enter deeper.

[Embodiment] An embodiment of the catheter of the present invention will be described below based on the drawings.

Figure 1 is a side view of the catheter (1), and its material, size, etc. are the same as conventional catheters. and,
At a point approximately 10 m from the tip, the catheter is bent at approximately 60° with respect to the longitudinal direction of the catheter. From the viewpoint of safety, it is desirable that the bending point be smooth as shown in the drawings.

The bend at the tip of this catheter (1) is not for selectively introducing the catheter into the primary branch of the aorta, as with conventional curved catheters, but rather to guide the tip of the catheter that has entered the primary branch of the aorta. It is meant to guide you to the desired secondary branch and serves as a pilot.

The upper limit of the length of the tip bending part (1a) of the catheter (1) is determined by taking into account the maximum inner diameter of the sub-aortic branches such as the glabrous artery, common iliac artery, and celiac artery. The length of part (1a) is 121m depending on the purpose of use.
It can be changed as appropriate within the range of 1 or less.

In addition, the bending angle of the distal end bending part (1a) of the catheter (1) with respect to the long axis direction, 30° to 90°, is determined considering that the branching angle of the secondary branch with respect to the primary branch is almost within this range. An angle of less than 30 degrees or more than 90 degrees does not serve as a pilot, and is often inconvenient.

Figure 2 shows the catheter (1) of this invention inserted into the aorta (A1).
It is a schematic diagram in the case of introducing the celiac artery (A2), which is a branch of the celiac artery, and further into the total artery (A3), which is a branch thereof.

First, insert the catheter (1) into the aorta (A1) using the usual method.
(Fig. 2a). Next, insert the catheter distal direction reversal guide wire (G) described in the April 15, 1986 patent application specification and drawings of the same applicant. Insert the guide wire (G) into the catheter, and expose the tip spiral portion of the guide wire (G) from the tip of the catheter (1) (Figure 2b). Then, the catheter (1)
After pushing forward and reversing the direction of movement of the tip,
Push the catheter forward until the length of the reversed portion is equal to or longer than the inner diameter of the aorta (A1) to prevent the direction of movement of the catheter (1) from reversing again (Fig. 2C). Then, insert the guide wire (
After removing the catheter (1) from the catheter (1), rotate the catheter (1) so that the tip of the catheter (1) faces outward (Figure 2d).Next, push the catheter (1) forward. After the distal end faces the celiac artery (A2), the catheter (1) is moved downward to introduce the distal end into the celiac artery (A2) (Fig. 2e). Finally, apply a rotational and longitudinal external force to the catheter (1) to direct its tip toward the total artery (A3), and then push the catheter (1) forward and enter the total artery (A3) (Figure 2f). ).

[Effects] Since the catheter of the present invention has only one bending point at its distal end, the external force applied to the catheter at the operator's hand is directly applied to the distal end of the catheter, making it possible to freely change the direction of rotation of the catheter distal end. or the catheter can be advanced deeper into the blood vessel. Moreover, this operation is not only easy, but also safe and reliable, which increases the safety of angiographic examinations, and also facilitates intra-arterial injection of anticancer drugs and arterial plug surgery, which improves diagnostic and treatment results. This can bring about improvements in

Moreover, by using the catheter of the present invention, it is possible to introduce the catheter into all the targeted aortic branches, including the head, abdomen, pelvis, and extremities, using the same ingredients and the same operations as described above. This eliminates the need to stock up on multiple types of catheters for each purpose, making it economical. Furthermore, this invention can be applied to thin catheters used for intravenous administration of contrast agents. This makes it possible to carry out selective contrast imaging on an outpatient basis, and improves the results in the early diagnosis of various vascular lesions and 1 mm injection lesions, greatly contributing to the improvement of medicine and medical care.

[Brief explanation of drawings]

Figure 1 is a side view of an embodiment of the catheter of the present invention, Figures 2a to 2f are schematic diagrams showing examples of its use,
FIG. 3 is a side view of an example of a conventional catheter. (1)...Catheter, (la)...Bent part, (A1)...Aorta, (A2)...Celiac artery, (A3)...Total artery, ( G)...Guide wire.

Claims (1)

[Claims] A multipurpose vascular catheter characterized by being bent at 30° to 90° within a range of 12 mm or less from the tip of the straight catheter.