JP-7855374-B2 - Bile aspiration catheter

Inventors

• 黒田 慶太
• 藤井 文都子

Assignees

• 株式会社カネカ

Dates

Publication Date

20260508

Application Date

20220315

Claims (5)

1. A catheter for inserting into the bile duct to aspirate bile, A shaft extending longitudinally from the proximal to the distal side, A first lumen is provided on the shaft, extending in the longitudinal direction and having a liquid discharge port at its distal end, The shaft is provided with a second lumen that extends in the longitudinal direction and has a liquid suction port at its distal end, The liquid discharge port is located distal to the liquid suction port and at the tip of the shaft . A bile aspiration catheter in which the first lumen has a constriction at its distal end, and the cross-sectional area of the first lumen at the constriction is formed to be narrower than that of its distal and proximal sides.
2. The bile aspiration catheter according to claim 1 , wherein the constriction portion is formed proximal to the liquid discharge port and distal to the liquid suction port.
3. The bile aspiration catheter according to claim 1 or 2, wherein the first lumen has a narrowing section on the proximal side of the constriction where the inner diameter of the first lumen narrows from the proximal side to the distal side, and an expanding section on the distal side of the constriction where the inner diameter of the first lumen widens from the proximal side to the distal side.
4. A bile aspiration catheter according to any one of claims 1 to 3, wherein the shaft has a tapered portion distal to the liquid aspiration port, with the outer diameter decreasing toward the distal end.
5. The bile aspiration catheter according to any one of claims 1 to 4, wherein, in a cross-section perpendicular to the longitudinal direction of the shaft, the cross-sectional area of the first lumen is smaller than the cross-sectional area of the second lumen.

Description

This invention relates to a bile aspiration catheter. Obstruction of the bile ducts due to gallstones, tumors, or other conditions, or obstruction of bile flow within the bile ducts, can lead to bile stagnation and bacterial infection. Bacterial infection of the bile can cause cholangitis, and if the bacteria-containing bile enters the bloodstream through the liver, it can lead to sepsis. In such cases, procedures to drain the bile from the bile ducts are necessary, such as percutaneous transhepatic biliary drainage (PTCD) or endoscopic biliary drainage (ERBD). As a catheter used for insertion into the bile duct, for example, Patent Document 1 discloses a bile duct drainage catheter comprising a catheter tube whose distal end is inserted into the bile duct, wherein the catheter tube has a main body portion whose outer diameter is substantially the same along the longitudinal direction, a first tapered portion connected to the distal end of the main body portion and whose outer diameter becomes smaller toward the distal end, a narrow-diameter straight body portion connected to the distal end of the first tapered portion and whose outer diameter is substantially the same along the longitudinal direction, and a second tapered portion connected to the distal end of the narrow-diameter straight body portion and whose outer diameter becomes smaller toward the distal end, wherein the outer diameter of the narrow-diameter straight body portion is 20 to 80% of the outer diameter of the main body portion and the length of the narrow-diameter straight body portion is 30 to 250 mm. Patent Document 2 discloses an elongated medical component comprising a long insertion section with multiple lumens through which a medical instrument for performing a predetermined medical procedure can be inserted, and a guide section extending from the tip of the insertion section to guide the insertion section. An opening is formed on the tip surface of the guide section, and fluid supply lumens are formed in both the insertion section and the guide section. Patent Document 2 also states that bile from the bile duct may be aspirated through the opening at the tip of the insertion section. Japanese Patent Publication No. 2004-329314Japanese Patent Publication No. 2011-251140 This figure shows an example of a bile aspiration catheter according to an embodiment of the present invention, and represents an overall side view of the bile aspiration catheter.Figure 1 shows a side view of the distal end of the bile aspiration catheter.Figure 1 shows a perspective view of the distal end of the bile aspiration catheter.Figure 2 shows a cross-sectional view of the distal end of the bile aspiration catheter along its longitudinal direction.Figure 4 shows a modified example of a cross-sectional view along the longitudinal direction of the distal end of the bile aspiration catheter.Figure 1 shows a VI-VI cross-sectional view of the bile aspiration catheter.Figure 2 shows a modified side view of the distal end of the bile aspiration catheter. The bile aspiration catheter of the present invention will be described in detail below based on the embodiments described below. However, the present invention is not limited by the embodiments described below, and it is certainly possible to implement the invention with appropriate modifications within the scope that is consistent with the spirit of the preceding and following descriptions, and all such modifications are included within the technical scope of the present invention. Note that, for convenience, hatching and component reference numerals may be omitted in the drawings; in such cases, please refer to the specification or other drawings. Furthermore, the dimensions of various components in the drawings may differ from the actual dimensions, as priority is given to understanding the features of the present invention. Referring to Figures 1 to 7, a bile suction catheter according to an embodiment of the present invention will be described. Figure 1 shows an example of a bile suction catheter according to an embodiment of the present invention, representing an overall side view of the bile suction catheter. Figures 2 and 3 show a side view and a perspective view of the distal end of the bile suction catheter shown in Figure 1, respectively. Figure 6 shows a VI-VI cross-sectional view of the bile suction catheter shown in Figure 1. Figure 5 shows a longitudinal cross-sectional view of the distal end of the bile suction catheter shown in Figure 4 and a modified example thereof. Figure 7 shows a modified example of the side view of the distal end of the bile suction catheter shown in Figure 2. The bile aspiration catheter 1 is a catheter used to aspirate bile by inserting it into the bile duct. The bile aspiration catheter 1 of the present invention can aspirate bile accumulated in the bile duct while simultaneously supplying fluid to flush the duct. Hereinafter, the bile aspiration catheter will simply be r