JPS6232043Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a Y-shaped drain tube used for medical purposes, and further for reconstruction of the common bile duct and intrahepatic bile duct.
In gallstone surgery or biliary tract surgery, techniques such as suturing and reconstructing the left and right intrahepatic bile ducts and common bile duct that come out from the left and right sides of the liver, or directly anastomosing the left and right intrahepatic bile ducts to the jejunum are performed. However, in this case, in order to secure the flow path between the left and right intrahepatic bile ducts and to drain bile, it is necessary to insert and leave a tube in the left and right intrahepatic bile ducts and remove this tube after the sutures have sufficiently healed. be.

Conventionally, these tubes have been used by inserting two tubes, or by processing a T-shaped tube, or by using a small Y-shaped tube.
It is used by processing a shaped tube.

In conventional T-shaped tubes and Y-shaped tubes, the entire tube is made to have the same outer diameter, so a thin tube must be used to insert it into the narrow left and right intrahepatic bile ducts. The disadvantage is that the main tube is too thin to drain the bile flowing out from the tube, and if a thick tube is to be used, it must be cut lengthwise beyond the bifurcation in order to be inserted into the intrahepatic bile duct. Therefore, the cross section of the tube is no longer circular, resulting in fatal defects such as the sewing needle getting caught when suturing the left and right intrahepatic bile ducts. ing.

The present invention improves these shortcomings,
_The gist is that ₍ a _{) D 2} /
This invention relates to a Y-shaped drain tube that satisfies the following relationships: D ₁ ≦0.8 and (b) d ₂ /d ₁ ≦0.7.

The present invention will be explained below based on the attached drawings.

As shown in FIG. 3, the part that merges from the left and right intrahepatic bile ducts 12 that come out of the liver 11 and becomes the common bile duct 13 is:
Anatomically, it has a cross-sectional area close to the sum of the cross-sectional areas of the left and right intrahepatic bile ducts. Therefore, in the Y-shaped drain tube inserted into the intrahepatic bile duct and the common bile duct, if the outer diameter of the branch duct 3 is about 0.7 times the outer diameter of the main canal 2 as shown in FIG. It can be used according to the anatomical cross-sectional area without any modification. However, when the wall thickness of the drain tube is taken into account, the inner diameter is even smaller than the outer diameter, and is therefore too narrow to be used as a bile flow path during treatment.

Furthermore, the outer diameter of the branch duct is naturally limited because it passes through the common bile duct as a twin duct when removed after healing. In other words, the inner diameter of the fistula in the common bile duct at the time of removal is approximately equal to the outer diameter of the main tube of the drain tube, and in order for two branch ducts to pass through this fistula,
The outer diameter of the branch pipe of the drain tube must be less than 0.8 times the outer diameter of the main pipe. That is, the fourth
As shown in the figure, two branch ducts with an outer diameter D ₂ are expected to pass through the common bile duct, which has approximately the same diameter as the outer diameter D ₁ of the main duct, as shown in Fig. 4C, and As a result of using various prototypes, it was found that if the ratio was 0.8 times or less, it could be used suitably without the above-mentioned problems.

On the other hand, during treatment, it is necessary to drain bile through a drain tube, and in this case, the inner diameter of the tube becomes a problem. In the currently used T-shaped and Y-shaped tubes, the inner diameter of the entire tube is the same, so the above-mentioned drawbacks are unavoidable, and there is an urgent need to improve this. The present invention overcomes the above-mentioned drawbacks by specifying the outer diameter as well as the inner diameter _d2 of the branch pipe and the inner diameter _d1 of the main pipe of the Y-shaped drain tube as follows. That is, d ₂ ≦
The relationship 0.7d ₁ must be satisfied.

That is, if D ₂ /D ₁ ≦0.8 and d ₂ /d ₁ ≦0.7, the object of the present invention can be effectively achieved. When these values are exceeded, there will be difficulty in the outflow of bile during treatment, and it will be very difficult to remove the Y-shaped drain tube after healing, resulting in great inconvenience in use. The Y-shaped drain tube according to the present invention usually has a branch pipe with an outer diameter of 3 to 6 mm and an inner diameter of 2 to 3 mm.
mm, the outer diameter of the main pipe is preferably 5 to 9 mm, and the inner diameter is preferably 3 to 6 mm.

By the way, we created a Y-shaped drain tube with the main pipe's outer diameter of 8 mm and inner diameter of 6 mm, and the branch pipe's outer diameter of 5.9 mm and inner diameter of 3.9 mm (D ₂ /D ₁ = 0.738, d ₂ /d ₁ = 0.65). When placed in the internal bile duct and common bile duct, bile flow was extremely smooth and bile sand also flowed out easily. In addition, removal after healing was easy, and no damage was found to the intrahepatic bile duct, common bile duct, or fistula after removal.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway vertical sectional view of a Y-shaped drain tube according to the present invention, FIG. 2 is a side perspective view thereof, and FIG. 3 is a state diagram in which the present invention is used.
FIG. 4 is a cross-sectional view of the main pipe and branch pipe when the tube is removed. In the figure, numeral 1 is a Y-shaped drain tube according to the present invention, 2 is its main pipe, and 3 is its branch pipe.

Claims (1)

[Scope of claim for utility model registration] In a Y-shaped drain tube consisting of a main pipe and a branch pipe, the main pipe has an outer diameter D ₁ , an inner diameter d ₁ and a branch pipe outer diameter D ₂ ,
A medical Y-shaped drain tube characterized in that it has the following relationship with the inner diameter d ₂ : (a) D ₂ /D ₁ ≦0.8 (b) d ₂ /d ₁ ≦0.7.