JPH0337635Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a catheter for injecting a blood coagulant into varicose veins that have occurred in body cavities such as the esophagus, and blocking the venous tube with clotted blood to prevent bleeding from the aneurysm. It is.

Conventionally, there was no dedicated coagulant injection catheter used for this type of surgery, and after reaching the affected area with an extremely long injection needle protected by an outer barrel, the needle protruded to puncture the varicose veins and coagulate them. The method used was to inject a drug, which was difficult to handle and required skill.

The present invention provides a blood coagulant injection catheter that allows the tip of the catheter to be reliably and safely introduced into a desired location and is suitable for surgery for varicose veins occurring in the esophagus or the like.

An embodiment of the catheter of the present invention will be described based on the drawings. As shown in the partially omitted vertical cross-sectional view in Figure 1, the enlarged cross-sectional view of the front part in Figure 2, and the enlarged cross-sectional view of the rear part in Figure 3, flexible polymeric materials such as polytetrafluoroethylene (commercial products) are used. The distal end portion of the inner tube 1 made of Teflon or polypropylene is conically narrowed to form a conical portion 2, and the other end of the inner tube 1 is fitted with a syringe barrel attachment portion 3. The syringe barrel mounting portion 3 is made of hard plastic such as polypropylene or polymethacrylic resin, or metal, and its cylindrical inner cavity forms a syringe barrel fitting cavity 4 into which a syringe barrel for injecting a blood coagulant is inserted. The syringe barrel attachment part 3 is attached to the end of the inner tube 1 so that the syringe barrel fitting cavity and the inner tube lumen are connected, and a locking part is provided on the outer periphery of the end of the syringe barrel attachment part 3. It has a structure commonly called a luer lock, and is connected to a luer lock cap 8, which will be described later.

A flexible and hard outer tube 5 is attached to the outside of the cylindrical tube so that it can freely slide along the outer surface of the inner tube. A metal core wire 6 is attached by passing through the inner cavity of the inner cylinder tube 1 and the inner cavity of the syringe barrel attachment part 3,
Unlike the strong piano wire, the core wire is a flexible metal wire, which allows the catheter to be bent into a curved shape and inserted into the blood vessel. The tip of the core wire 6 is formed into a point 7, which projects from the conical portion 2 of the inner tube, and the core wire 6 has a gap with the inner wall of the inner tube, and The thickness is such that it can slide inside the conical part. The other end of the metal core wire 6 is fixed to the center of the inner surface of a hard plastic or metal Luer lock cap 8, so that the core wire 6 can be used to unlock the syringe barrel attachment and the cap and pull out the core wire together with the cap. It is now possible to remove it.

A method of operating the catheter according to the present invention will be explained. into the forceps cavity of the endoscope inserted into the esophagus from the oral cavity.
The catheter according to the present invention is inserted with the core tip retracted beyond the tip of the outer tube, the tip of the outer tube protrudes from the tip of the endoscope, and the tip is inserted into the vein under direct vision of the endoscope. Bring it close to the aneurysm, then make the inner tube protrude from the outer tube, puncture the varicose vein with the pointed tip of the metal core wire, and insert the inner tube into the varicose vein.
Next, the lock at the rear of the core wire is disengaged, the core wire is pulled out, and the inner tube is advanced into the vein to reach the desired hemostasis site, and the syringe tube insertion part at the rear of the inner tube is filled with a coagulating agent. The tube is fitted and a coagulant is injected through the inner tube and the tube is withdrawn into the vein to perform the treatment.

Since the catheter for coagulant injection according to the present invention has the above-mentioned configuration, the tip of the catheter can be inserted into the varicose veins as explained in the operation method, and the catheter can be safely passed through the blood vessel to insert the inner tube without damaging the blood vessel. The tip can reach a predetermined site and the coagulant can be injected reliably and easily, greatly contributing to urgent varicose vein surgery.

Furthermore, in addition to the esophagus, it can also be suitably applied to hemostatic surgery for varicose veins that occur in similar body lumens.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted longitudinal cross-sectional view of the catheter according to the present invention, FIG. 2 is an enlarged longitudinal cross-sectional view of the leading portion thereof, and FIG. 3 is an enlarged longitudinal cross-sectional view of the catheter portion thereof. DESCRIPTION OF SYMBOLS 1... Inner tube, 3... Syringe barrel attachment part, 5... Outer tube, 6... Metal core wire, 8... Luer lock cap.

Claims (1)

[Scope of utility model registration request] A syringe barrel attachment part is attached to the other end of a flexible inner tube whose one end is conically narrowed so that the syringe barrel fitting cavity of the attachment part is connected to the inner tube, and the flexible outer tube is The tube is covered with an outer jacket so that it can freely slide along the inner tube, and a flexible metal core wire of a thickness that maintains a gap with the inner wall of the inner tube and slides on the conical tip end of the inner tube is attached to the inner tube. and the flexible metal core wire is inserted into the syringe barrel fitting cavity, the protruding end of the flexible metal core wire from the conical part of the inner cylindrical tube is formed into a pointed head, and the other end is engaged with the end of the syringe barrel attachment part. A catheter device for injecting a coagulating agent for varicose veins, such as the esophagus, characterized by being fixed to the center of the cap.