JPH0115308B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intravascular indwelling catheter having wings that is used as a handle during puncture or as a fixing means when the catheter is indwelled in a blood vessel.

Intravascular indwelling catheters (i) blood leaks when the inner needle is removed after being punctured into the blood vessel, (ii) the positional relationship between the inner needle and catheter is likely to shift during puncture, and (iii)
There are problems such as the lack of a suitable means for preventing blood leakage when infusion of drug solution is interrupted after indwelling in a blood vessel.

To deal with these problems, the conventional method for problem (i) is to provide an elastic tube at the proximal end of an intravascular catheter and press this tube when removing the inner needle to prevent blood leakage. Alternatively, a method has been proposed in which an elastic tube with a knob is built into the proximal end of the catheter and the knob is pressed to prevent blood leakage (US Patent No. 3856010). However, the former method has the disadvantage that the positional relationship between the inner needle and catheter is easily misaligned due to the elastic tube, and in both methods, the tube is directly pinched and pressed with the fingers, so It requires force and is troublesome to operate. (ii)
To solve this problem, methods have been proposed such as providing a step on the inner needle and locking it to the step on the inner wall of the catheter. It is not necessarily an effective method because it causes turbulent flow and causes blood coagulation, and there are also problems in that it requires skill to operate as a means for preventing blood leakage. Furthermore, to solve problem (iii), a method has been proposed in which a cap is fixed to the wing tip of the catheter, removed when necessary, and placed over the proximal opening of the catheter, as disclosed in U.S. Patent No. 3802433. However, when these wings are fixed to the skin, they have the disadvantage that they get in the way.

This invention has been made in view of the above circumstances, and can solve the problems mentioned above, as well as
The present invention provides a winged intravascular indwelling catheter that is simple in structure and easy to operate.

That is, the present invention includes a flexible tube body that has an inner diameter that allows introduction of an inner needle for puncturing a blood vessel and is inserted into a blood vessel, one end of which is connected to the proximal end of the tube body,
An elastic catheter base body whose other end forms a connecting part that can be connected to another liquid circuit, and which has a lumen in its axis that communicates with the tube body; a pair of flexible wings that are located substantially at or below the bottom surface and are inclined upward toward the tip of the tube body;
a protrusion protruding from the upper surface of the both wing parts and pressing the lumen of the catheter base so as to reduce the cross-sectional area of the lumen when the wing parts are bent upward toward each other; An object of the present invention is to provide a winged intravascular indwelling catheter comprising:

The present invention further provides the above-mentioned catheter, characterized in that the protrusion is connected to the catheter base in a state where the protrusion gradually becomes higher toward the catheter base.

The present invention further provides the catheter described above, wherein the ridgeline of the protrusion is biased towards the front of the catheter.

The present invention further provides the above-mentioned catheter, characterized in that the protrusion portion is provided in a protruding manner and is separated from the catheter base body.

The present invention further provides the catheter described above, wherein a plurality of the protrusions are formed on the upper surface of at least one of the wings.

The present invention is further characterized in that the catheter base has cap locking means on its upper surface for locking and tightening a cap for closing the proximal opening of the catheter base in a direction opposite to the distal end direction of the catheter. The present invention provides a catheter.

The present invention will be described below with reference to illustrated embodiments.

In the figure, 1 is made of, for example, fluorine resin, made by extrusion molding, and has an outer diameter of 0.5 mm to 2.5 mm and a wall thickness of 0.08 mm to 2.5 mm.
It is a flexible tube body with a length of 0.25 mm and a length of 25.4 mm to 300 mm, and its inner diameter is slightly larger than the outer diameter of the inner needle 3 for puncturing a blood vessel to be introduced, and its proximal end is connected to the tip of the catheter base body 5. There is. As shown in FIG. 3, the catheter base bodies 5 are fitted together and made of, for example, injection molded polypropylene, and have a hub portion 7 having an outer diameter of 3.8 mm and a length of 13.5 mm.
The base end of the flexible tube body 1 is bonded to the inner hole wall of the hub portion 7 via an adhesive 11 such as polyurethane or epoxy. The main body 9 of the catheter base 5 has a rear end forming a connecting part 13 for connecting to another liquid circuit (not shown), an axis 12 of which communicates with the tube body 1, and an outer diameter of the inner needle 3. A lumen having a slightly larger inner diameter is formed. For example, make it about 0.2 mm larger than the outer diameter of the inner needle. A luer taper is formed at one end to facilitate insertion of the inner needle 3. At both left and right ends of the catheter base 5, a pair of flexible wings 15 made of soft vinyl chloride resin by injection molding, for example, extend symmetrically in a direction substantially perpendicular to the axial direction of the catheter. The material of the wings is preferably one that returns to its original state within 30 seconds when the wings are pinched and then released. The wing portion 15 is provided so that its bottom surface is located approximately at the same level or slightly below the bottom surface of the connection portion with the catheter base body 5, as shown in FIG. It is inclined 3 to 10 degrees upward in the parallel direction. This is to ensure that when the catheter is placed in the blood vessel, it will be approximately parallel to the skin surface. A protrusion 17 is preferably formed integrally with the wing portion 15 on the upper surface of each of the wing portions 15 . As shown in FIG. 4, this protrusion 17 is connected to the main body 9 so as to gradually become higher toward the catheter base 5. For example, the width of the end of the wing on the main body side is 8.5 mm, the width of the tip of the wing is 12 mm, and the length from the end of the main body side to the tip is
When the diameter is 15 mm, the shape of the protrusion decreases continuously from the main body side toward the tip of the wing part by about 10 mm toward the tip. The height of the end of the protrusion on the main body side is 4 mm, and the angle at which the plane of the wing intersects with the ridgeline from the end of the protrusion on the main body side toward the tip is
A range of 30 degrees to 40 degrees is preferred.

In the figure, 21 is a hub portion of the inner needle 3, which is injection molded from polypropylene or the like. The rear end is open and has a luer taper to allow attachment of a cap 23 or a syringe (not shown). The cap 23 is equipped with a blood leakage-resistant filter such as a water-repellent membrane filter, and the inside of the hub 21 can communicate with the outside through the filter. Further, a protector for protecting the inner needle and flexible tube body is fitted onto the hub portion. Note that the protector is made by extrusion molding or injection molding from polypropylene, polyethylene, or the like.

Next, to explain how to use this intravascular catheter, first, after inserting the inner needle 3, as shown in FIG. Grasp it, and in that state puncture the tip of the inner needle 3 into the blood vessel. in this case,
When both wing parts 15 are bent upward as described above, the pair of protrusions 17 provided on the upper surface of these wing parts 15 gradually compress the inner cavity 14 of the main body 9, reducing the cross-sectional area of the inner cavity 14. Finally, as shown in FIG. 6, the lumen 14 is crushed vertically, thereby compressing and fixing the inner needle 3, so that the positional relationship between the inner needle 3 and the tube body 1 is shifted during catheter puncture. There is no fear.

When the catheter is placed on the skin after puncturing in this way, the inner needle 3 is first removed.
In that case, slightly loosen the pressure on the wing part 15 with your fingers,
To make it easy to remove the inner needle 3. After the inner needle 3 is removed and passes through the wing section 15, the pressure on the wing section 15 with the finger is immediately increased to completely prevent blood from leaking from the inside of the blood vessel via the catheter from the connection section 13. Can be done. Next, after connecting another liquid circuit to the connection part 13 of the catheter base 5, the pressure on the wings 15 is released, the wings 15 are expanded to their original state, and each wing 15 is fixed to the skin surface with tape.

The winged intravascular indwelling catheter of this type has projections on the upper surface of the wings, and by bending both wing parts upward and grasping them with fingers, the inner lumen of the catheter base can be compressed and occluded. Blood leakage when the inner needle is removed can be easily prevented, and misalignment of the positional relationship between the inner needle and the catheter when the catheter is punctured can also be easily prevented.

In the present invention, there is no particular restriction on the shape of the protrusion provided on the upper surface of the wing as long as it can close the lumen of the catheter base by bending the wing.

As shown in FIG. 4, by connecting the protrusion 17 to the catheter base 5 in a state where it gradually becomes higher toward the catheter base 5, the stress when the wings 15 are bent is easily concentrated on the catheter base 5. Therefore, the lumen 15 can be closed with a relatively small force.

Furthermore, as shown in FIG. 2, the ridgeline of the protrusion 17 is biased toward the front, making it easier to hold the indwelling catheter during puncture, and the wings are also easier to bend, making it easier to push the catheter forward. I could do that.

Furthermore, as shown in FIG. 11 (corresponding to FIG. 4), if the protrusion 17 is provided so as to project apart from the catheter base 5, the wings 15 can be bent more easily.

Further, as shown in FIG. 12 (corresponding to FIG. 3), if a plurality of protrusions 17 are formed on the upper surface of at least one wing 5, these plurality of protrusions 17 will allow the catheter base 5 to Since the occlusion is made at multiple points, the integrity of the channel occlusion could be made more effective. For example, the width of the end of the wing on the main body side is 8.5 mm, the width of the tip of the wing is 12 mm,
If the length from the end of the main body side to the tip is 15 mm and two protrusions are provided, the protrusions extend continuously from the main body side toward the tip of the wing and extend approximately 10 mm toward the tip. Its shape is shrinking. The height at the end of the protrusion on the main body side is 2 mm, and the width is 2 mm.
mm, and the distance between the protrusions is 2 mm at the end on the main body side and 4 mm at the tip end, and the angle at which the plane of the wing intersects with the ridgeline from the end on the main body side of the protrusion toward the tip end is Approximately 11 degrees is preferable. Note that the plurality of protrusions 17 may be provided on the wing 15 so as to mesh with each other so as to be offset from each other for convenience such as ease of holding. In addition, the shape of the wings is approximately 0.5mm near the joint with the catheter base.
Various choices can be made, such as making it as thin as possible to make it easier to bend, or providing unevenness on the bottom surface to provide an anti-slip effect.

[Brief explanation of drawings]

The drawings show an embodiment of the winged intravascular indwelling catheter according to the present invention, in which Fig. 1 is a plan view of the catheter, Fig. 2 is a side view of the catheter shown in Fig. 1, and Fig. 3 is a side view of the catheter shown in Fig. 1. FIG. 2 is a sectional view taken along the line; FIG. 4 is a front view of the catheter shown in FIG. 2; FIG. 5 is a side view of the catheter shown in FIG. - in figure 5
7 and 8 are respectively a front view and a plan view of the catheter of a modified example of the protrusion on the wing. DESCRIPTION OF SYMBOLS 1... Flexible tube, 3... Inner needle, 5... Catheter base, 7... Hub portion, 9... Main body, 11
... Adhesive, 12 ... Thin core, 13 ... Connection part, 1
5...Wing part, 17...Protrusion, 21...Hub part, 2
3... Cap.

Claims (1)

[Scope of Claims] 1. A flexible tube body inserted into a blood vessel and having an inner diameter that allows introduction of an inner needle for puncturing a blood vessel, one end of which is connected to the proximal end of the tube body, and the other end of which is connected to the proximal end of the tube body, and the other end is connected to the proximal end of the tube body, and the other end is connected to the proximal end of the tube body, and the other end is connected to the proximal end of the tube body, and the other end is connected to the proximal end of the tube body. an elastic catheter base that forms a connecting part that can be connected to the liquid circuit of the tube body and has a lumen in its axis that communicates with the tube body; or a pair of flexible wings located below and inclined upward toward the distal end side of the tube body, and a pair of flexible wings protruding from the upper surface of each wing adjacent to the side of the catheter base. When the two wing portions are bent upward toward each other, the catheter base portion between the protrusions is automatically pressed from both sides by the protrusions, and the catheter base portion is 1. A winged intravascular indwelling catheter characterized in that the surfaces of the inner lumen of the lumen thereof are deformed so as to come into close contact with each other. 2. The catheter according to claim 1, wherein the protrusion is connected to the catheter base in a state where the protrusion gradually becomes higher toward the catheter base. 3. The catheter according to claim 2, wherein the ridgeline of the projection is offset toward the front of the catheter. 4. The catheter according to claim 1, wherein the protrusion is provided to protrude apart from the catheter base. 5. The catheter according to claim 1, wherein a plurality of protrusions are formed on the upper surface of at least one wing. 6. Claims 1 to 5, wherein the catheter base has a cap locking means on its upper surface for locking and tightening a cap for closing the proximal opening of the catheter base in a direction opposite to the distal end direction of the catheter. Catheter according to any of paragraphs.