JPH0316689Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is a disposable, inexpensive, retrograde puncture needle that can be used by medical personnel by easily bending the puncture needle manually depending on the situation during surgery. The present invention relates to a transhepatobiliary drainage device.

[Prior art]

A catheter or tube is placed in the bile duct for the purpose of injecting drugs or contrast media into internal organs, especially the bile duct, or draining bile (drainage). There are two methods: one method involves puncturing the bile duct and placing a drainage tube into the bile duct through the outer skin, and the other method involves placing a drainage tube under surgery.

In the case of the latter method, a T-tube is generally used, and the drainage tube is guided directly outside the body from the common bile duct without going through the liver, but the T-tube has the disadvantage that bile tends to leak into the body cavity. Furthermore, in operations such as bile duct duodenostomy in which the common bile duct is completely removed, it is difficult to use a T tube, and it is more advantageous to place a straight tube transhepatically during the operation than in the biliary tract. However, suitable for this kind of use,
Alternatively, there is no special tool, and a drainage tube connected to a surgical sonde as shown in FIG. 4, for example, is used instead. However, the surgical sonde is not only made of silver and expensive, but also has a blunt tip 7, so very strong force is required to lead it out of the body transhepatically. In addition, the rear end 8 is thicker, and a drainage tube 9 is connected here, and a thread 10 is wound and fixed, creating a larger step. It has the disadvantage of being easy to damage.

In order to address these current problems, the inventors of the present invention first devised a puncture needle for transhepatic biliary drainage having the structure shown in Figure 5.
-Disclosed in No. 69077. This puncture needle is attached to both ends of an intermediate pipe 14 made of metal such as aluminum.
A leading end 12 and a trailing end connector 13 made of metal such as stainless steel or hard plastic.
The interior of the intermediate pipe 14 is filled with a pipe filling material 15 made of thermoplastic plastic such as ABS resin or rubber. It is useful as a tool to be installed inside the body, but when used, the intermediate pipe 14 and the tip 1
2 or near the joint with the rear end connector portion 13, which is difficult to bend.

[Purpose of invention]

In view of the above-mentioned shortcomings and the current situation, the present invention has developed a puncture needle that is inexpensive, disposable, does not damage living tissue when guided out of the body, is durable, and has excellent bending properties. The object of the present invention is to provide a biliary drainage device in which drainage tubes having the same outer diameter are connected without any steps and can be easily installed transhepatically during surgery for biliary tract diseases.

[Structure of the idea]

That is, the present invention is a medical drainage tube indwelling device in which a puncture needle with a conical tip and a drainage tube are connected, and the puncture needle has a metal pipe that can be easily deformed and a pipe that penetrates the metal pipe. It consists of a thermoplastic plastic molded body integrally molded with the tip of the puncture needle at one end and the rear end connector at the other end.The rear connector has a drainage tube with the same outer diameter as the puncture needle without any steps. This is a retrograde transhepatic biliary drainage device characterized by being connected.

One embodiment of the drainage tool according to the present invention will be described with reference to the drawings. As shown in the sectional view shown in FIG. It is composed of a thermoplastic molded body 4 that is integrally molded with the connector part 2. The thermoplastic molded body 4 is provided to penetrate the metal pipe 3, and the rear end is bent to prevent it from slipping during use. It is fixed by a caulking tool 2a.

As shown in Figure 3, drainage tools include:
The tip of a drainage tube 5 is connected to the rear end connector portion 2 of the puncture needle, and the distal end 6 of the drainage tube is provided with a side hole and an end hole, and is processed to function effectively as a drainage tube. There is. In actual use, the puncture needle is led out of the body from the intrahepatic bile duct through the liver during the surgery, and at this time, the drainage tube 5 is guided by the puncture needle and led out of the body. After the puncture needle has been guided out of the body, the distal end 6 of the drainage tube
Once the drainage tube 5 is placed at the target site in the biliary tract, the tip of the drainage tube is cut off to separate the puncture needle, and the drainage tube 5 is indwelled in the body transhepatically.

The tip 1 of the puncture needle is processed so that the tip angle A shown in FIG. 2 is between 5° and 65°, preferably between 20° and 30°, in order to facilitate puncturing and penetrating living tissue. There is. If the tip angle is less than 5 degrees, it is easy to damage body tissue, especially blood vessels, and if it is more than 65 degrees, it becomes extremely difficult or impossible to puncture and penetrate living tissue. The rear end connector part 2 has a rod shape as shown in FIG. 1 so that the rear part can be connected to a drainage tube, or it can have a scale-like protrusion like the rear end connector part 13 shown in FIG. The puncture needle and the drainage tube can be connected without creating a step, and in order to prevent the metal pipe 3 and the thermoplastic molded body 4 from shifting during use, the caulking tool 2a is used. Thus, the metal pipe 3 is fixed. The caulking tool 2a is attached to the rear end connector portion 2 with adhesive or solvent.

The tip 1 of the puncture needle needs to have strength and rigidity to withstand the force when puncturing and penetrating living tissue, and the rear end connector 2 needs to have the strength and rigidity to withstand the force when the drainage tube 5 is securely attached and guided. It must have strength and rigidity to withstand and not break or deform. Furthermore, the thermoplastic molded body 4 located inside the metal pipe 3 has plastic deformability and reinforcing properties that can prevent the cross section of the pipe from irrecoverably deforming or breaking when the metal pipe 3 is bent. required. Therefore, the material for integrally molding the distal end portion 1, the rear end connector portion 2, and the thermoplastic molded body 4 is required to have both strength, rigidity, and plastic deformability. Thermoplastics such as polyvinyl chloride resin, ABS resin, polyethylene, polyester, and polypropylene can be used.
It is not limited to these.

The metal pipe 3 is a part that gives the puncture needle according to the present invention the feature that it can be easily transformed into a desired shape by hand force, and its purpose is to puncture the liver via the intrahepatic bile duct. The shape of the puncture needle can be changed during surgery according to the curvature of the intrahepatic bile duct. For this reason, a metal pipe that can easily undergo plastic deformation is used as the intermediate pipe 3. Examples of such materials include, but are not limited to, aluminum, copper, and brass.

The drainage tube 5 must be flexible and strong so that it can be guided by a puncture needle and penetrate living tissue, must not be deteriorated by bile, and must be transparent so that the bile inside the tube can be visually observed. At times, X-rays may be used to confirm the location of detention.
Needless to say, it is desirable to have a line for contrast imaging. Materials for drainage tubes include thermoplastics such as soft polyvinyl chloride resin, polyurethane, and polyethylene.
Rubbers such as silicone rubber and various thermoplastic elastomers can be used, but are not limited to these. Furthermore, barium sulfate, bismuth subcarbonate, and the like are used as materials for the X-ray contrast line, but the material is not limited to these. A side hole and a terminal hole are provided at the end of the drainage tube, and the diameter is generally 0.5 to 2.0 m.
m in size, two to three side holes and one end hole are provided, but there is no particular limitation as long as the shape and number facilitate drainage.

[Effect of idea]

As mentioned above, the drainage device according to the present invention is
The shape of the puncture needle can be easily transformed into the desired shape by hand during surgery according to the curvature of the intrahepatic bile duct, and the tip and rear connector parts are integrally molded, making it durable and easy to puncture. The needle can be easily bent near both ends, and the tip angle is designed to be suitable for puncturing living tissue, making puncturing and penetration not only easy, but also without damaging surrounding body tissue. Because it is lightweight, the tip is easy to feel in the hand, the puncture position can be easily confirmed, the drainage tube can be connected to the puncture needle and easily guided out of the body, and it can be manufactured at a very low cost. Therefore, it is easy to use, disposable, and extremely useful as a tool for transhepatically placing a drainage tube inside the body.

[Brief explanation of the drawing]

1 to 3 are views showing one embodiment of the present invention, in which FIG. 1 is a sectional view of a puncture needle, FIG. 2 is an enlarged view showing the shape of the tip of the puncture needle, and FIG. FIG. 2 is a diagram in which a drainage tube is connected to the puncture needle in FIG. 1; FIG. 4 is a schematic diagram of a drainage tube connected to a surgical probe. Moreover, FIG. 5 is a sectional view showing a conventional puncture needle for transhepatic biliary drainage.

Claims (1)

[Scope of utility model registration request] A medical drainage tube indwelling device in which a puncture needle with a conical tip and a drainage tube are connected, includes a metal pipe in which the puncture needle can be easily deformed, and a puncture needle provided through the metal pipe at one end. It consists of a thermoplastic molded body integrally molded with the tip of the puncture needle and the rear end connector at the other end, and a drainage tube with the same outer diameter as the puncture needle is connected to the rear connector without a step. A retrograde transhepatic biliary drainage device characterized by: