Ball-type anti-reflux biliary stent

Abstract

A ball-type anti-reflux biliary stent, including a meshed body, a cup and a ball. The cup and the ball are respectively provided at two ends of the meshed body. Inner diameters of the cup and the ball is larger than that of the meshed body. The meshed body includes a plurality of sections, and two adjacent sections are connected by a flexible wire. The cup of the stent is a cylinder open outwards, and the opening of the ball is connected to a tube having a substantially elliptical cross section. Therefore, a displacement of the stent is prevented for an accurate fixation of the stent. Moreover, the intestinal juice is prevented from flowing back into the biliary tract, avoiding infectious diseases.

Claims

1. A ball-type anti-reflux biliary stent, comprising: a meshed body, a cup, and a ball with an opening; wherein the cup and the ball are respectively provided at two ends of the meshed body; inner diameters of the cup and the ball are larger than that of the meshed body; the meshed body comprises a plurality of sections, and two adjacent sections are connected by a flexible wire; the opening of the ball is connected to a tube having a substantially elliptical cross section; a ratio of a length of the tube to a diameter of the ball is 2:3 to 3:2; and a length-to-width ratio of the tube is 2:1 to 6:1; and outer surfaces of the meshed body, the cup and the ball are covered with a silica gel membrane.

2. The ball-type anti-reflux biliary stent of claim 1, wherein the cup is a cylinder open outwards; and a joint surface between the meshed body and the cup is a curved surface.

3. The ball-type anti-reflux biliary stent of claim 1, wherein the flexible wire connecting the two adjacent sections has a length of 2-6 mm.

4. The ball-type anti-reflux biliary stent of claim 1, wherein the meshed body, the cup and the ball are formed of braided nickel-titanium wires.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The present invention will be further described in detail below with reference to the accompanying drawings and embodiments, from which the advantages of the above and/or other aspects will be more apparent.

(2) FIG. 1 is a perspective view of an anti-reflux biliary stent.

(3) FIG. 2 is a top view of the anti-reflux biliary stent.

(4) FIG. 3 is a side view of the anti-reflux biliary stent.

(5) FIG. 4 is a partial enlarged view showing a ball of the anti-reflux biliary stent.

DETAILED DESCRIPTION OF EMBODIMENTS

(6) The present disclosure can be better understood according to the following embodiments.

(7) Structures, proportions, sizes shown in the drawings are only illustrative of the disclosure in the specification for understanding and reading by those skilled in the art, and are not intended to limit the conditions at that the present invention is implemented. Any modifications of structures, changes in proportions or adjustments of sizes, which do not affect the achievable effects and purposes, shall fall within the scope of the present disclosure. As used herein, terms such as upper, lower, front, rear, middle are also used for illustrative purposes, and are not intended to limit the scope of the present disclosure. Any changes or adjustments of the relative relationship without departing from the substantial technical contents are considered to be within the scope of the present disclosure.

(8) As shown in FIGS. 1 and 2, an anti-reflux stent includes a meshed body 2, a cup 1 and a ball 4. The cup 1 and the ball 4 are respectively provided at two ends of the meshed body 2. Inner diameters of the cup 1 and the ball 4 are larger than that of the meshed body 2, which can prevent a displacement of the stent for an accurate fixation of the stent. The cup 1 is a cylinder open outwards. A joint surface between the meshed body 2 and the cup 1 is a curved surface. The opening of the ball 4 is connected to a tube 5 having a substantially elliptical cross section. A ratio of a length of the tube 5 to a diameter of the ball 4 is 1:1. A length-to-width ratio of the tube 5 is 5:1. In this way, the intestinal juice can easily flow from the cup 1, and flow out of the ball 4. However, a reverse inflow from the tube 5 is hard to achieve, so that the intestinal juice is prevented from flowing back into the biliary tract, avoiding infectious diseases.

(9) The meshed body 2, the cup 1 and the ball 4 are formed of braided nickel-titanium wires, and outer surfaces of the meshed body, the cup and the ball are covered with a silica gel membrane, which is beneficial for the shape holding of the stent and prevents tissue hyperplasia from growing into the stent enabling a recycle of the stent.

(10) The meshed body 2 includes two sections which are connected by a flexible wire 3 having a length of 3 cm in the middle, so that the stent can be easily bent at a certain angle to adapt to the physiological anatomy structure of the biliary tract. In this way, the stent has an improved compliance over the existing stent having an integrated structure of the stent and the film.

(11) The present disclosure provides a concept and a spirit for the ball-type anti-reflux biliary stent, and various implementations can be used to implement the present invention. The above-mentioned is only some preferred embodiments. It should be noted that any improvements and modifications may be made by those skilled in the art without departing from the principle of the disclosure, and shall fall within the scope of the present disclosure. The unspecified components in the embodiments can be implemented by using existing techniques.