CATHETER

Abstract: A balloon-carrying catheter having at a front end portion of a catheter body a balloon which can be expanded when a fluid is introduced thereinto, characterized in that the interior of the balloon is divided into a plurality of circumferentially arrayed chambers, a fluid being supplied from a fluid supply tube to at least one of these chambers to expand the same chamber, whereby the direction of the front end of the catheter is controlled at a branch point of a blood vessel.

Description: TECHNICAL FIELD The present invention relates to a catheter, and particularly to a catheter which is inserted into the blood vessels, urethra, and similar vessels of the body. BACKGROUND ART Various methods have been developed for the treatment of arterial and vascular constriction or occlusion due to arteriosclerosis, and for the removal of thrombi. The most widely used method is bypass surgery in which the lesioned member of the blood vessel is surgically removed and replaced with a section of blood vessel from the patient or with an artificial blood vessel, thus physically eliminating the problem. However, because this procedure necessitates cutting the body open, the load on the body is great and treatment incurs great cost. Drug therapy is also employed, but this is only effective for dissolving thrombi, and is not very successful at removing arteriosclerotic foci or occlusions. New alternative methods selectively employed include the insertion of a catheter with a balloon into the blood vessel and inflating the balloon at the site of the lesion to mechanically enlarge the blood vessel at the constricted site, and the insertion of a catheter with a balloon in which is carried an optical fiber for laser conduction. In this latter method, the balloon is inflated to occlude the blood vessel and stop the blood flow while the laser is used to evaporate the lesion. Diagnostic techniques employed with the inside wall of the blood vessels includes the insertion of a catheter containing an imaging fiber into the blood vessel to inspect lesions using said imaging fiber. In the use of such a catheter for therapy or diagnosis as previously described, it must be possible to steer the catheter in the desired direction at blood vessel bifurcations in order for the catheter to reach the site of the target lesion. This is presently accomplished by using a catheter the leading end of which is bent to a specific angle. The catheter is steered by rotating the hand-held end of the catheter to align the leading end with the branch vessel down which the catheter is to be conducted. However, large individual differences in the shape and condition of said bifurcations make it difficult to use catheters of the above construction with all patients, and it is also difficult to conduct the catheter down the desired branch at complex, multi-branched junctions. It has therefore been proposed to use a jointed ring construction on the catheter end and to steer the catheter in the desired direction by operating a wire passing through the catheter. However, because the construction of such a catheter is complex, it is difficult to achieve a fine diameter catheter. EP-A-0 231 725 discloses a catheter according to the preamble part of claim 1 or claim 2. The known catheter is provided on the tip with balloons of the type which can be inflated by being filled with the fluid, said balloons being arranged around the circumference of said catheter, each of said balloons being provided with a specific channel to supply fluid to each balloon. However, the balloons can only be inflated simultaneously. It is an object underlying the present invention to provide a catheter according to the preamble part of claim 1 or claim 2 the construction of which is simple and which can be easily conducted in the desired direction through blood vessels and other vessels of the body. The solution of this object is achieved by the features of claim 1 or claim 2. Using a catheter according to claim 1, the catheter tip can be aligned in the desired direction when the catheter is inserted into a blood vessel or simular vessel by supplying a fluid to a specific compartment through the fluid supply channels and thus inflating said compartment. Using a catheter according to claim 2, the catheter tip can be aligned in the desired direction by likewise supplying a fluid to a specific balloon to inflate said balloon. BRIEF DESCRIPTION OF DRAWINGS Fig. 1 is a side view of a first embodiment of a catheter according to the present invention, Fig. 2 is a cross section of said first catheter, Fig. 3 and Fig. 4 are cross sections showing said catheter in use, and Fig. 5 is a front view of an alternative catheter. BEST MODE FOR CARRYING OUT THE INVENTION Fig. 1 is a front view showing the front tip of a catheter 1 according to the present invention. Said tip is comprised of a balloon 2 which is used to occlude vessel A, which may be a blood vessel or similar vessel. Inside said balloon 2 is formed multiple compartments 4 which are divided by walls 3 as shown in Fig. 2. A channel 5 for fluid supply is individually provided to each of compartments 4 so that a gas or fluid may be supplied separately and individually to each of compartments 4 via said channel 5 in order to inflate that compartment 4. Said fluid supply channels 5 are formed by compartmentalizing the inside of a single tube 6 as shown in the figure according to the number of compartments 4 provided. The inside of tube 6 may be used as a channel 7 for the supply of drugs. If the catheter 1 is constructed as just described, when the catheter 1 is inserted into vessel A and is advanced to a bifurcation or other juncture in vessel A, the tip of catheter 1 can be aligned in the desired direction and conducted down the desired branch vessel by selectively inflating compartments 4. Specifically, if, as shown in Fig. 3, inflation fluid is supplied to the compartment 4 which is opposite the bottom wall of vessel A on the inside of the vessel so that said compartment 4 is inflated, when the bottom side of balloon 2 contacts the inside wall of vessel A, the tip of catheter 1 will be lifted and aligned with the branch which is diagonally above the bifurcation point. Therefore, said catheter 1 can be inserted into branch vessel A1 by inserting the catheter 1 farther. Furthermore, as shown in Fig. 4, if the compartment 4 opposite the top inside wall of vessel A is inflated, when the top side of the balloon 2 contacts the inside wall of vessel A, the tip of the catheter 1 will be forced down and aligned with the branch which is diagonally below the bifurcation point. Therefore, said catheter 1 can be inserted into branch vessel A2 by inserting the catheter 1 farther. Thus, the angle of orientation of the tip of catheter 1 can be freely adjusted by controlling the amount by which compartment 4 is inflated in each of the above situations. Furthermore, the orientation and direction of the catheter 1 can also be freely adjusted by appropriately inflating multiple compartments 4 at the same time. Fig. 5 is a cross section of an alternative embodiment of catheter 1. It differs from the embodiment previously described in that multiple balloons 2 are provided diametrically along catheter 1, and fluid supply channels 5 are provided individually and separately to each of said balloons 2. As with the previous embodiment of catheter 1, the catheter 1 tip can be aligned in the desired direction and conducted down the desired branch vessel by selectively inflating balloons 2 when the catheter 1 tip reaches the bifurcation of vessel A. A catheter 1 according to the present invention is not limited to the above embodiments, however, and may be constructed, for example, with multiple individual tubes for each of the required fluid supply channels 5, and the construction may be changed by increasing the number of compartments 4 and balloons 2 without changing the intent and meaning of the invention. INDUSTRIAL APPLICABILITY A catheter 1 according to the present invention is also suited to endoscope catheters in which an imaging fiber is imbedded in the catheter, laser illumination catheters in which a laser conducting fiber is imbedded in the catheter, and other types of catheters. A catheter according to the present invention as previously described offers the benefit of being easily conducted to the target site because the catheter can be aligned in any desired direction at any desired angle by selectively inflating any of multiple compartments inside a balloon or by selectively inflating any of multiple balloons. In addition, the additional benefit of being able to achieve fine diameter catheters can be provided because the construction is simple.

Claims: A catheter (1) provided on the tip with balloon means of the type which can be inflated by being filled with a fluid, said balloon means comprising multiple compartments (4) being provided with a specific channel (5) used to supply fluid to said compartment (4), being characterized in that said balloon means is a balloon (2) comprising multiple compartments (4) around the inside circumference of said balloon (2), and that means are provided for specifically supplying fluid to one or more of said compartments (4) so as to conduct the catheter (1) in a desired direction. A catheter (1) provided on the tip with balloons (2) of the type which can be inflated by being filled with a fluid, said balloons (2) being arranged around the circumference of said catheter (1), each of said balloons being provided with a specific channel (5) used to supply fluid to each balloon (2), being characterized in means for specifically supplying fluid to one or more of the balloons (2) so as to conduct the catheter (1) in a desired direction. A catheter according to claim 1 or 2, being characterized in that a separation wall in the form of a tube (6) between the compartments (4) and the corresponding channel (5) is provided. A catheter according to claim 3, being characterized in that the inside of said tube (6) comprises a channel (7) for the supply of drugs.

Inventors: KANAZAWA SHIN-ICHI OSAKA WORKS, NIWA SHIN-ICHIRO OSAKA WORKS O, SOGAWA ICHIRO OSAKA WORKS OF S, UEMIYA TAKAFUMI OSAKA WORKS OF, YOTSUYA KORO OSAKA WORKS OF SU, KANAZAWA, SHIN-ICHI OSAKA WORKS OF SUMITOMO ELECTR, NIWA, SHIN -ICHIRO OSAKA WORKS OF SUMITOMO ELECTR., SOGAWA, ICHIRO OSAKA WORKS OF SUMITOMO ELECTR., UEMIYA, TAKAFUMI OSAKA WORKS OF SUMITOMO ELECTR., YOTSUYA, KORO OSAKA WORKS OF SUMITOMO ELECTR.
Applicants: SUMITOMO ELECTRIC INDUSTRIES, SUMITOMO ELECTRIC INDUSTRIES, LTD.
Application year: 1989
Main classification: A61M25
IPC codes: A61M25