JP2006026110A - Balloon and medical catheter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a balloon and a medical catheter providing a wide adhesion face, preventing easy peeling and firmly stuck by strengthening adhesion. <P>SOLUTION: The balloon is provided with an inner cylindrical tube 5 and an outer cylindrical tube 6 doubledly formed into the inner/outer tubes, and partition pieces 7 integrally and longitudinally formed in a plurality of circumferential parts between the both cylindrical tubes. A plurality of spaces partitioned by the partition pieces are formed into tightly sealed fluid storage parts 8 and the respective parts can be inflated by filling fluid to the fluid storage parts. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a balloon and a medical catheter, and particularly relates to a balloon that is easy to attach to the distal end portion of a catheter body and that is difficult to peel off and can be firmly attached.

  Conventionally, as a balloon used for a medical catheter, for example, a split / independent inflation balloon as previously proposed by the present applicant is known (for example, see Patent Document 1).

JP 2003-250900 A

  As shown in FIG. 4, the balloon of this Patent Document 1 is bonded and partitioned in the longitudinal direction between the inner peripheral surface of the balloon 31 and the outer peripheral surface of the catheter main body 32 by a separate partition piece 33, and is partitioned by the partition piece. A plurality of spaces are formed in the sealed fluid accommodating portion 34. However, since adhesion with such a segment piece 33 is a narrow one with a limited adhesion width, the adhesive force is weak, and when the balloon 31 is inflated, the adhesion part between the segment piece 33 and the outer peripheral surface of the catheter body 32 There was a problem that was easily peeled off. Although it is conceivable to increase the bonding width in order to strengthen the adhesive force, in this case, the balloon capacity becomes small, and balloon burst occurs, making it difficult to put it to practical use.

  Accordingly, the present invention provides a balloon and a medical catheter that solves the conventional problems as described above and is difficult to peel off by widening the adhesive surface and strengthening the adhesive force, thereby enabling a strong attachment. With the goal.

  In order to achieve the above-mentioned object, the invention according to claim 1 is a balloon used for a medical catheter, comprising an inner cylindrical tube and an outer cylindrical tube which are doubled inside and outside, and a space between these cylindrical tubes. And a plurality of spaces integrally formed in the longitudinal direction at a plurality of locations in the circumferential direction, and a plurality of spaces partitioned by these partition pieces are formed in a sealed fluid storage portion, and these fluid storage portions Each of the balloons can be inflated independently by being filled with a fluid.

  The invention according to claim 2 is a balloon according to claim 1, wherein the partitioning piece is made of the same material as the inner cylindrical tube and the outer cylindrical tube, and has substantially the same thickness. is there.

  The invention according to claim 3 is characterized in that the balloon according to claim 1 or 2 is fitted into the distal end portion of the catheter body, and is attached by full adhesion on the inner surface of the inner cylindrical tube. It is a medical catheter.

  The present invention integrally has an inner cylindrical tube and an outer cylindrical tube that are doubled inside and outside as described above, and a partition piece, and the inner cylindrical tube is fitted and inserted into the distal end portion of the catheter body. Since it is possible to bond the entire surface on the inner surface, the adhesive surface can be taken much wider than the conventional one and the adhesive strength can be strengthened, which makes it difficult to peel off and makes it possible to attach firmly There is an effect. Moreover, since the partition piece is located between the two cylindrical tubes and is provided integrally therewith, there is no fear that the partition piece will be peeled off or easily detached.

  An embodiment of the present invention will be described with reference to the accompanying drawings.

  1 is an enlarged longitudinal sectional view of the balloon, FIG. 2 is a perspective view of a main part of the medical catheter in a state where the balloon of FIG. 1 is attached to the distal end portion of the catheter body, and FIG. 3 is taken along line AA in FIG. It is an enlarged vertical sectional view. Reference numeral 1 denotes a balloon, which is made of a thin-walled silicone rubber (for example, 0.1 to 1.0 mm) as a whole, has a predetermined length as shown in FIG. Bonding portions 3 and 4 are provided to be bonded to the outer peripheral surface of the tip portion. As shown in FIG. 1, a longitudinal section of the balloon 1 other than the bonding portions 3 and 4 is shown in FIG. 1. The balloon 1 has an inner cylindrical tube 5, an outer cylindrical tube 6, and a circle between both cylindrical tubes. It is composed of partition pieces 7 that are integrally provided in the longitudinal direction at a plurality of locations in the circumferential direction, and a plurality of spaces partitioned by these partition pieces 7 are formed in a sealed fluid storage portion 8. . In this embodiment, two fluid storage portions 8 having substantially the same size are provided by two partition pieces 7 provided with a phase difference of 180 degrees. The inner cylindrical tube 5 has an inner diameter that is sized to fit into the distal end of the catheter body 2. Reference numeral 9 denotes a main lumen of the catheter body 2.

  The partition piece 7 is made of the same material as the inner cylindrical tube 5 and the outer cylindrical tube 6 and has substantially the same thickness (width). When the fluid storage portion 8 is filled with fluid, the portions of the outer cylindrical tube 6 corresponding to the fluid storage portion 8 can be independently expanded. Although not shown in FIGS. 2 and 3, lumens are formed on the peripheral wall of the catheter body 2 to send fluid to each of the fluid accommodating portions 8 of the balloon, and an opening communicating with the lumen is formed in an inner cylindrical shape of the balloon. It is formed in the tube 5.

  The balloon 1 as described above is manufactured by tube extrusion. That is, normally, in the case of such a split type balloon, a thin balloon is partially bonded to the catheter body 2. In the case of this invention, the split type balloon is manufactured by extrusion molding. As shown in FIG. 1, the extruded tube is a three-lumen tube having a central hole having substantially the same inner diameter as the outer diameter of the catheter body 2 and balloon holes on both sides thereof. The production is not necessarily performed by the extrusion molding, but may be performed by press molding using a mold, dipping molding, or the like.

  In order to attach the balloon 1 as described above to a medical catheter, a silicone adhesive is applied to the inner peripheral surface of the inner cylindrical tube 5 and the balloon 1 coated with the silicone adhesive is then attached to the distal end of the catheter body 2. The coated silicone adhesive of the inner cylindrical tube 5 is adhered to the outer peripheral surface of the catheter main body 2 when it reaches a predetermined position at the distal end. FIG. 3 shows this adhesion state. As is clear from the drawing, the inner surface of the inner cylindrical tube 5 of the balloon 1 is adhered to the outer peripheral surface of the catheter body 2 via a silicone adhesive. It becomes. Further, both end portions of the balloon 1 are also bonded by the bonding portions 3 and 4.

  Since the balloon 1 bonded to the outer peripheral surface of the catheter body 2 has the inner peripheral surface of the inner cylindrical tube 5 adhered to the outer peripheral surface of the catheter main body 2 via a silicone adhesive as described above, FIG. Compared to the conventional partition piece 33 having a narrow bonding margin, the bonding margin can be made extremely large, and the bonding strength can be increased. Moreover, this entire surface adhesion does not affect the expansion of the outer cylindrical tube 6 at all. Therefore, the conventional peeling due to insufficient adhesive strength does not occur, and the fluid capacity of the balloon 1 to the fluid accommodating portion 8 can be expected as before. Moreover, since it adhere | attaches on the outer peripheral surface of the catheter main body 2 by whole surface adhesion | attachment, it is also possible to eliminate the adhesion parts 3 and 4 of the both ends like the past if needed. As for the thickness of the balloon 1, the thinner the whole, the less the resistance when inserted into the body, which is desirable. In addition, although the thickness of the outer cylindrical tube 6 is limited by the strength required after expansion, etc., the thickness of the inner cylindrical tube 5 can maintain the strength by being adhered to the entire catheter body 2, It can be very thin.

  In the above-described embodiment, the two-divided type is shown as the balloon 1, but it is needless to say that three or more divided types may be used. The material is not limited to silicone rubber, and any material that does not adversely affect the living body can be used. In addition, it is needless to say that detailed design matters can be appropriately changed and modified without departing from the matters described in the claims.

1 is an enlarged longitudinal sectional view showing a balloon according to an embodiment of the present invention. FIG. 2 is a perspective view of a main part of the medical catheter in a state where the balloon of FIG. 1 is attached to the distal end portion of the catheter body. FIG. 3 is an enlarged longitudinal sectional view taken along line AA in FIG. 2. FIG. 4 is an enlarged longitudinal sectional view corresponding to FIG. 3 showing a conventional balloon.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Balloon 2 Catheter main body 3, 4 Bonding part 5 Inner cylindrical tube 6 Outer cylindrical tube 7 Partition piece 8 Fluid accommodating part

Claims (3)

A balloon used in a medical catheter,
An inner cylindrical tube and an outer cylindrical tube which are doubled inside and outside, and partition pieces integrally provided in the longitudinal direction at a plurality of locations in the circumferential direction between the two cylindrical tubes. A balloon characterized in that a plurality of spaces defined by the above are formed in an airtight fluid storage portion, and each of the fluid storage portions is filled with a fluid so that each of them can be expanded independently.   The balloon according to claim 1, wherein the partition piece is made of the same material as the inner cylindrical tube and the outer cylindrical tube and has substantially the same thickness.   A medical catheter according to claim 1, wherein the balloon according to claim 1 or 2 is fitted on the inner surface of the inner tubular tube by being fitted and inserted into the distal end portion of the catheter body.

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