JPH0268073A - Balloon catheter - Google Patents

Abstract

PURPOSE:To satisfactorily develop the elastic fiber of a blood vessel wall with the removal of pressurized and set or a thrombus while a blocking part is heated by providing an expandable and contractible balloon in a tip part and providing an electrode for high frequency heating in the internal part of this balloon. CONSTITUTION:An expandable and contractible balloon 2 is formed in the tip part of an X-ray impermeable Teflon-made catheter 1. An electrode 3 for high frequency heating to be provided in the central axis direction of the balloon 2 has a cone shape and the electrode is formed with a flexible metallic material to be an X-ray impermeable marker. When the tip part of the catheter 1 is positioned in the spot of a blocking part 16, an induced current flow from a high frequence generator 10 through electrodes 3 and 3A into an organ and the part of the blocking part 16 is locally heated about at 60 deg.C. After that, liquid is sent through an opening part 6 to the balloon 2 and the balloon is expanded. The heated blocking part 16 is smoothly pushed out by the expanded balloon and satisfactorily squashed. Then, blood flow can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a balloon catheter for dilating blood vessels to treat occlusion of blood vessels due to arteriosclerosis, etc., among cardiovascular catheters.

[Prior art] A method of treating vascular occlusion using a balloon catheter involves inflating a balloon under pressure at room temperature in the area of lumen occlusion to mechanically crush thrombi and atheroma and stretch the vascular wall. to expand the occluded area and improve blood flow,
After the tip of the catheter is advanced beyond the white stopper, a balloon is inflated to move the thrombus outside the body and remove it, thereby ensuring blood flow.

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, calcified and hardened atheroma and thrombi are often impossible to remove, and in order to stretch the blood vessel wall only by mechanical pressure, the elastic fibers of the tunica media are torn and the blood vessel is stretched. It may be complicated by dissection or perforation. Furthermore, it has been reported that even if the dilation is successful for a while, restenosis occurs in about 30% of cases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a balloon catheter that can remove hardened atheroma or thrombus by applying pressure while heating the occluded area, thereby effectively stretching the elastic fibers of the blood vessel wall.

[Means for Solving the Problems] The present invention includes a balloon that can be expanded and deflated at its tip, and an electrode for high-frequency heating inside the balloon.

[Function] With the above configuration, the balloon is inflated while the vascular occlusion is heated by the high-frequency heating method.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 and 2, reference numeral 1 is a catheter made of, for example, X-ray-opaque Teflon, and a balloon 2 that can be inflated and deflated is formed at the distal end of the catheter 1. Reference numeral 43 indicates the balloon 2. This is an electrode for high frequency heating provided in the central axis direction, and this electrode 3 has an outer diameter of, for example, 2.
It has a conical shape with an inner diameter of 1.6 mm, an inner diameter of 1.6 mm, and a length of 20 mm+, and is made of a visible metal material that serves as an X-ray opaque marker. Further, the sharp tip portion 4 of the electrode 3 is inserted into the attachment portion 5 located on the distal side of the balloon 2, and the proximal end portion 6 of the electrode 3 is formed over almost the entire length of the catheter 1 in the axial direction. The liquid supply path 7 is connected to the liquid supply path 7. An opening 8 is formed in the electrode 3 at a position communicating with the inside of the balloon 2, and the liquid feeding path 7
A liquid feeding pump and a suction pump (not shown) are selectively connected to the base end of the pump for communication. Therefore, by operating the liquid pump to send liquid to the balloon 2, it can be expanded, and by operating the suction pump to suck the liquid in the balloon 2, it can be deflated. It has become. Further, a stylet 9 is inserted into the liquid feeding path 7, and the electrode 3 is electrically connected to the stylet 9. In FIG. 3, the high frequency generator 10 has a frequency of 13.56 MHz and an output of 2 to 8 W, and its output terminal is connected to a counter electrode f! through a copper wire 1112. Connected to 3.3A. 13 is a potential control device, and 14 is a monitor device. The copper wire 11 is connected to a small-diameter conical electrode 3 via a stylet 9, and the copper wire 12 is connected to an electrode 3A having a metal disk structure attached to the front or back side of the living body.
It is connected to the. Therefore, while observing the monitor device 14 and adjusting the potential control device 13, an induced current is passed through the living body to perform local heating using the counter electrode heating method.

Next, a case will be described in which a blood clot is removed using the balloon catheter.

First, as shown in FIG. 4, the catheter 1 is percutaneously inserted into the blood vessel 15 with the balloon 2 deflated. When the distal end of the catheter 1 is positioned at the occluded portion 16, the induced current from the high frequency generator 10 is applied to the electrode 3.
, 3A into the living body to locally heat the occluded portion 16 to around 60°C. Thereafter, a liquid is sent to the balloon 2 through the opening 6 to inflate it as shown in FIG. Then, the closed portion 16 heated to around 60° C. is smoothly expanded and crushed by the expanded balloon 2, and blood flow can be ensured.

In addition, the catheter 1 may be moved back and forth or rotated in this state, and even if the occluded part 16 is calcified and hardened, the balloon 2 is heated while the occluded part 16 is heated.
By inflating and pressing against it, the closing portion 16 can be crushed well.

FIG. 6 shows another embodiment of the present invention, in which an insertion passage 17 is formed in the catheter 1 around the liquid feeding passage 7 over almost the entire length in the axial direction, and a stylet 9 is provided in the insertion passage 17. It has been inserted. Further, an opening 6A is formed at the tip of the liquid feeding path 7, located on the proximal side inside the balloon 2, and the proximal end of the conical electrode 3 provided in the direction of the central axis of the balloon 2 is formed at the tip of the liquid feeding path 7. Attachment portion 5A c, formed on the distal side of the opening 6A: Fitted and supported, and the tip of the electrode 3 is inserted and supported by the attachment portion 5. According to such a structure, there is no need to form an opening in the electrode 3.

Note that the present invention is not limited to the above embodiments, and can be modified in various ways within the scope of the gist of the invention. For example, the balloon catheter of the present invention can be used to dilate a valvular stenosis caused by heart valve disease. can also be applied.

[Effects of the Invention] This invention is equipped with a balloon that can be inflated and deflated at its tip, and an electrode for high-frequency heating is provided inside the balloon, which heats the occluded area from the lumen of the blood vessel. It is possible to provide a balloon catheter in which the occluded portion can be expanded well by pressurizing the occlusion area.

FIG. 5 is an explanatory diagram showing the order of expanding the occluded portion, and FIG. 6 is a sectional view showing another embodiment of the present invention.

1... Catheter 2... Balloon 3... Electrode patent for high frequency heating Applicant: Inter-Tsuba Co., Ltd.
Shuta Satake, District Attorney, Patent Attorney Mamoru Ushiki

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the distal end of a balloon catheter showing an embodiment of the present invention, FIG. 2 is a perspective view showing an electrode and a stylet, FIG. 3 is a schematic explanatory view showing a treatment state, and FIGS. Fig. 4 Fig. 5

Claims (1)

[Scope of Claims] A balloon catheter characterized in that it has a balloon that can be inflated and deflated at its tip, and that an electrode for high-frequency heating is provided inside the balloon.