JPH0412992Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a catheter inserted into a blood vessel for diagnosis or treatment of blood vessels and organs.

[Prior Art] It is well known that catheters are used for percutaneously inserting into blood vessels and administering and injecting therapeutic agents, contrast agents, etc. to affected areas.

This catheter is inserted into a blood vessel, and it is desirable to use one made of a relatively soft material in order to prevent damage caused by impact on the inner wall of the blood vessel during insertion and to prevent pain.

However, catheters that are generally soft bend easily. Therefore, the propulsive force applied from the proximal end during insertion is absorbed by the bending in the middle and does not reach the distal end, making it difficult to reach the target position, so a relatively hard catheter is used. , multiple types with different hardness are used depending on the purpose of use and the condition of blood vessels.

[Problems to be solved by the invention] However, while a rigid device as a whole is suitable for long insertion distances, the hard tip may hit the inner wall of the blood vessel, causing damage or detachment, or causing pain due to impact. There are problems such as:

The present invention was developed to solve these problems, and it allows the target position to be reached extremely easily even when the insertion distance is long, and it also prevents damage or detachment to the inner wall of the blood vessel during insertion. The purpose is to provide a catheter that does not cause any discomfort or pain.

[Means for Solving the Problems] The catheter of the present invention has an outer layer made of hard synthetic resin having plasticity over the entire region except for the tip of the thin tube made of soft synthetic resin having plasticity and having a rounded tip surface. The outer layer thin tube is closely covered with the thin tube, and the outer circumferential surface of the outer layer thin tube is smoothly inclined so that the outer peripheral surface of the tip becomes smaller toward the tip, and the tip is formed to be equal to the outer diameter of the thin tube. It is characterized by an expanded flange formed at the proximal end where the thin tube and the outer layer thin tube overlap, and this is used as a means to solve the above-mentioned problems.

[Function] The propulsive force is applied from the proximal end side by closely covering the outer layer of the tubule made of hard synthetic resin with plasticity with the tubule made of soft synthetic resin that has plasticity, making almost the whole hard, except for the tip. is sufficiently transmitted to the tip, and the tip can be freely curved along the blood vessel to facilitate advancement within the blood vessel.

Furthermore, the distal end portion exposed from the outer tubule is made of soft synthetic resin and the distal end surface is rounded to prevent damage and peeling due to impact on the inner wall of the blood vessel.

[Example] The drawing shows an example of the present invention, in which a thin tube 1 made of soft synthetic resin having a predetermined diameter and length has an outer layer made of hard synthetic resin having plasticity over the entire area except for the tip 1a. The thin tube 2 is closely covered.

The capillary tube 1 has a rounded tip surface 1b, and the outer circumferential surface of the tip portion 2a of the outer layer capillary tube 2 slopes smoothly so that the diameter decreases toward the tip, and the tip is equal to the outer diameter of the capillary tube 1. It is formed to be.

Further, a flange 3a is formed to expand at the base end 3 where the thin tube 1 and the outer layer thin tube 2 overlap.

This embodiment, which is constructed in this way, is inserted into the blood vessel until the tip reaches the target position in the same way as conventional catheters, and the flange 3 formed on the proximal end 3 is inserted into the blood vessel until the distal end reaches the target position.
A therapeutic agent, a contrast agent, etc. are discharged from the tip opening using a connected injector (not shown) and administered and injected to the target position.

At this time, since this embodiment has a structure in which the outer thin tube 2 made of a hard synthetic resin having plasticity is tightly covered with the thin tube 1 made of a soft synthetic resin having plasticity, the tip portion 1a is formed to be sufficiently soft and the tip end 1a is formed to be sufficiently soft. It is formed to have appropriate hardness as a whole except for part 1a.

Therefore, the propulsive force applied from the proximal end 3a side is sufficiently transmitted to the distal end, and in addition, the distal end 1a of the thin tube 1 made of soft synthetic resin follows the blood vessel as shown in FIG. Since it is freely bendable, it can be advanced very easily within the blood vessel to the target position, and can be used without any problems even when the distance to the target position is long. In particular, since the capillary tube 1 and the outer layer capillary tube 2 are in close contact with each other, they are inserted as one without the capillary tube 1 expanding or contracting, so that a passage of a predetermined diameter is reliably formed within the blood vessel.

In addition, since the end portion 1a of the thin tube 1 is made of soft synthetic resin and the tip surface 1b is rounded,
Even if the distal end portion 1a collides with the inner wall of the blood vessel during insertion, there is no fear that it will cause damage or separation inside the blood vessel, or even cause pain.

Furthermore, the tip 2a of the outer layer thin tube 2 is formed so that the outer circumferential surface thereof becomes smaller in diameter toward the tip, and the tip is formed to be equal to the outer diameter of the thin tube 1, and has steps or sharp lines. Therefore, there is no fear that the distal end portion 2a will get caught on the inner wall of the blood vessel at the start of insertion or during the insertion, thereby impeding insertion, or that the inner wall of the blood vessel will be damaged or peeled off.

[Effects of the invention] The present invention having the above configuration has almost the entire part formed to have an appropriate hardness, and the tip is formed sufficiently soft so that it can be bent along the blood vessel during insertion, so that it can be used when the insertion distance is long. It can also be inserted very easily.

In addition, the tip is formed to be soft and the tip surface is rounded, and the tip of the outer thin tube is also smoothly sloped so that the outer peripheral surface becomes smaller in diameter toward the tip. It is extremely safe as it does not cause damage or detachment to the inner wall of blood vessels, and there is no fear of causing pain.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted sectional view showing an embodiment of the present invention, and FIG. 2 is a partially omitted sectional view of the embodiment shown in FIG. 1 in a state of use. DESCRIPTION OF SYMBOLS 1... Thin tube, 1a... Tip part, 1b... Tip surface, 2... Outer layer thin tube, 2a... Tip part, 3... Base end part, 3a... Flange.

Claims (1)

[Scope of utility model registration request] The entire area of the thin tube made of a soft synthetic resin having plasticity and having a rounded tip surface is closely covered with an outer layer thin tube made of a hard synthetic resin having plasticity, and the outer layer thin tube has a tip portion. The outer circumferential surface of the thin tube is smoothly inclined so that the diameter becomes smaller toward the tip, and the tip is formed to be equal to the outer diameter of the thin tube, and a flange is formed to expand at the proximal end where the thin tube and the outer layer thin tube overlap. A catheter characterized by: