JP2918577B2 - Medical tubing - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tube for blood supply and blood removal used in extracorporeal circulation during cardiac surgery, and more particularly to a femoral vein and a bypass for a femoral artery. The present invention relates to a blood removal tube capable of ensuring a stable and sufficient blood removal flow rate.

[Conventional technology]

At the time of heart surgery, the heart itself stops beating and the operation is performed in a state of asphyxia. However, in order to maintain the patient's life, the circulation of blood into the patient's body cannot be stopped. Therefore, the patient's blood is led out of the body, and the circulation of blood, that is, extracorporeal circulation is continued using an artificial heart-lung machine or an artificial lung. Normally, blood is led out of the right atrium of the patient's heart to the outside (blood removal). ) And after purifying it with a heart-lung machine or an artificial lung, it is generally returned to the patient's artery (femoral artery, common carotid artery, etc.) again. The blood travels around the patient's body, collects in the vena cava, and returns to the right atrium of the heart. (Femoro-Femural bypass) Specifically, the patient's thigh is incised, the venous blood vessels are exposed, the vein is usually opened, a blood removal tube is inserted, and the iliac vein and the inferior vena cava are passed through. Enter the atrium and place the tip. The other end of the blood removal tube is connected to a heart-lung machine or an artificial lung. At this time, it is difficult to insert the blood removal tube from the iliac vein to the inferior vena cava. This is because this portion is bent and constricted, and the left side is particularly remarkable. In addition, at the time of cardiac surgery, the patient is placed in such a position that the left side with the heart is on the upper side of the bed, so that insertion from the left side is advantageous.

It is desirable that the blood removal tube inserted into the vein of the patient be thinner, but this is not appropriate from the viewpoint of securing the blood removal flow rate. Therefore, in the conventional blood removal tube having a certain diameter, it is difficult to pass through the bent portion even when the tube is inserted as described above, and when the tube is advanced, there is a possibility that the inner end wall of the blood vessel may be damaged by the tube tip.

[Problems to be solved by the invention]

The present invention provides a safe and secure method for inserting a blood removal tube from the femoral vein to the inferior venous vein, which is difficult to enter, and safely and securely from both the left and right sides during conventional FF bypass. It is an object of the present invention to provide a tube that can pass through the iliac vein.

[Means for solving the problem]

That is, in the present invention, the distal end portion has an opening and a plurality of side holes near the distal end portion, and the terminal portion has a trumpet-shaped tube main body and an outer diameter that can be inserted into the lumen of the tube main body. A stylet provided with a stopper near the terminal. The stylet has a fluid path for injecting fluid into the balloon in the longitudinal direction with a balloon mounted at the distal end and a rear end of the fluid path. Is a medical tube characterized by connecting and branching a thin tube provided with an inlet.

As shown in FIG. 1, the medical tube used in the present invention has an opening (1) at the tip and a plurality of side holes (3) near the tip, and the terminal (4) has a connector or the like. It comprises a tube body (2) having a wrapper shape so that it can be fitted to the body, and a stylet (5) built in the lumen of the tube body (2). A balloon (7) is attached to the stylet tip (6), a stopper (8) is provided near the end of the stylet (5), and a balloon (7) is provided in the longitudinal direction of the stylet (5). A fluid passage for inflating the tube is provided, a narrow tube (11) is connected to the rear end thereof, and the tube is branched, and the tube (11) has an inlet (9) at the end. The inflated state (10) of the balloon (7) is as shown by the dotted line.

The tube body (2) and the stylet (5) are made of flexible plastic or rubber, and the tube body (2) is made of thermoplastic resin such as polyvinyl chloride, polyurethane, polyamide, or silicone rubber. Needless to say, it is preferable to contain an X-ray contrast agent such as bismuth dicarbonate or barium sulfate in a line or entirely. Alternatively, a stainless steel wire or a resin wire may be processed into a spiral shape and embedded in a wall to reinforce it. Stylet (5) is the tube body (2)
Similarly, a thermoplastic resin is preferable, and among these, a slippery and stiff polypropylene or polyamide is preferable. If necessary, a reinforcing metal core, a wire rope, or the like may be incorporated.

The distal end of the stylet (6) does not protrude due to the inflation of the balloon (7), and does not damage the blood vessel wall when inserted into the blood vessel. Even if the tip (6) protrudes, there is no problem if it is formed of a very soft material, for example, a soft type silicone rubber.

The inlet (9) for injecting physiological saline or CO2 gas to inflate the balloon (7) attached to the tip of the stylet (5) can be a one-way push-in valve, two-way or Either can be used with a three-way cock. It is more convenient to introduce the inlet (9) with the stylet (5) with a small-diameter tube (11) having an appropriate length.

FIG. 2 is a cross-sectional view of the stylet, showing an embodiment of a type in which a guide wire can be used through a central portion thereof. In particular, a technique of inserting into a blood vessel using a guide wire is useful for a percutaneous puncture type medical tube. FIG. 2 (a) shows a double tube system in which an outer peripheral space (13) serving as a fluid passage for balloon inflation is arranged around a guide hole center hole (12). (B) shows a two-lumen system, which has a center hole for a guide wire (14).
In addition to the above, a lumen (15) for balloon inflation is provided.

〔The invention's effect〕

By using the medical tube according to the present invention,
When inserting a tube for blood removal from the femoral vein and entering the right atrium for extracorporeal circulation in cardiac surgery etc., the passage from the iliac vein, which is difficult to insert, to the inferior vena cava is easy, safe and reliable. Can be inserted from either the left or right thigh, and the medical tube inserted in this way can reliably and stably deliver high blood flow from the heart without causing ischemia due to respiratory movement. Since blood can be removed and a balloon is attached to the distal end of the tube, the inner wall of the blood vessel is not damaged when the tube is inserted into or advanced into the blood vessel.

[Brief description of the drawings]

FIG. 1 is a view showing the overall structure of a medical tube according to one embodiment of the present invention, and FIG. 2 is a sectional view showing an embodiment of a stylet that can use a guide wire.

Claims (1)

(57) [Claims] An end portion has an opening and has a plurality of side holes near the end portion, and a terminal portion has a trumpet-shaped tube main body and an outer diameter capable of being inserted into a lumen of the tube main body. A stylet provided with a stopper near the terminal. The stylet has a fluid path for injecting fluid into the balloon in the longitudinal direction with a balloon mounted at the distal end and a rear end of the fluid path. A medical tube characterized by connecting a small tube provided with an inlet to the tube and branching the tube.