JP2000167061A - Catheter introducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a useful catheter introducer capable of further reducing a resistance value during puncture and removal without fear of biting the inner wall of a blood vessel into slits and ensuring efficient and uniform jetting of medicinal solution including a vasodilator filled from a heparin line through the slits in a sheathed tube. SOLUTION: Slits 1a, 1a and so forth are made in the periphery face of a sheathed tube 1. The slits 1a, 1a and so forth are preferably made in a spiral shape so as to be open at 120-degree intervals in the peripheral direction. If radial spasm occurs in a blood vessel, dilator 6 instead of a catheter is inserted to the sheathed tube 1 and medicinal solution including a vasodilator is filled from a heparin line 3. while the medicinal solution is somewhat poured out to the direction of its end because the opening at the end of the sheathed tube 1 is almost blocked by the large diameter portion 6b, it is pressfitted once into a clearance between both members and thus forcibly jetted out of the slits 1a, 1a and so forth in the sheathed tube 1 to the radial direction with its pressure so as to efficiently arrive at the inner skin of a blood vessel, making it possible to immediately remove radial spasm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a catheter introducer in which a sheath tube is previously introduced into a blood vessel in order to insert the catheter into the blood vessel.
More specifically, the resistance value at the time of puncture and withdrawal is low, and a drug solution such as a vasodilator to be injected from a heparin line can be efficiently ejected from a slit of a sheath tube (without using any conventional optulator). Resides in catheter introducer.

[0002]

2. Description of the Related Art Conventionally, as such a catheter introducer, for example, one disclosed in Japanese Patent No. 2510886 is known. This conventional catheter introducer includes a hollow sheath tube that can be introduced into a blood vessel and has an open end, a sheath body (base portion) that communicates with the hollow portion of the sheath tube, and has a conduction path with a valve. And a plurality of side holes are provided on a peripheral surface of the sheath tube.

[0003]

However, in the catheter introducer disclosed in the above-mentioned Japanese Patent No. 2510886, since the side hole of the sheath tube is formed in a circle or an ellipse, the inside of the hole is not provided. It is feared that the inner wall of the blood vessel may bite into the blood vessel, and this may increase the resistance at the time of removal, causing radiation spasm or forcibly removing the sheath tube. It is feared that the worst condition, such as the extraction, may cause endothelial damage, dissociation, and even internal bleeding (arterial internal bleeding) due to rupture of blood vessels (arterial internal bleeding).

[0004] In addition, this conventional catheter introducer has a problem that arterial blood is ejected from a side hole of a sheath tube unless an extraction optulator is used. This requires time and effort, such as the necessity of injecting a chemical solution using an obturator (sputter).

The present invention has been made in view of such a conventional problem, and there is no fear that the inner wall of a blood vessel may penetrate into a slit hole, thereby further reducing the resistance value at the time of puncture and withdrawal, and reducing the heparin line. It is an object of the present invention to provide a useful catheter introducer capable of efficiently and surely ejecting a drug solution such as a vasodilator injected from a sheath tube through a slit of a sheath tube.

[0006]

SUMMARY OF THE INVENTION In order to solve the conventional problems as described above and to achieve the intended object, the constitution of the present invention is to provide a sheath tube having a desired length and communicating with the sheath tube. And a heparin line provided in the catheter introducer, the sheath tube has at least one or more slits on its surface, a vasodilator injected from the heparin line by inserting a dilator for vasodilation and the like. In the catheter introducer for ejecting the liquid medicine from the slit.

The slit has a length of 0.1 mm or more.
It is preferable that the thickness is 50 mm and the depth is substantially equal to the thickness of the sheath tube.

Further, the slit may be formed in the longitudinal direction of the sheath tube as a base, and may be formed at an angle in a predetermined direction as needed, or may be formed on the surface of the sheath tube via a concave portion.

It is preferable that the dilator has an outer diameter smaller than an inner diameter of the sheath tube, and has a large diameter portion to be joined to an inner peripheral surface of the sheath tube at a predetermined position.

[0010] In the catheter introducer of the present invention configured as described above, the sheath tube has at least one or more slits on its surface, and a dilator for vasodilation is inserted thereinto, so that the blood vessel is inserted into the slit. There is no fear that the inner wall will bite, and the resistance value at the time of puncture and withdrawal will be further reduced, and the drug solution injected from the heparin line will be pressed into the narrow clearance between the sheath tube and the dilator, and the pressure ( Water pressure)
By using this, it is possible to uniformly and vigorously (uniformly) squirt from each slit of the sheath tube.

The slit has a length of 0.1 mm or less.
50 mm, the depth is almost equal to the thickness of the sheath tube, only at a certain pressure higher than normal blood pressure,
It functions as a valve and can prevent blood from entering the sheath tube.

Further, if the slit is basically formed in the longitudinal direction of the sheath tube and is angled in a predetermined direction as required, the slit can be bored without impairing the flexibility of the sheath tube. .

In addition, if the slit is formed on the surface of the sheath tube through a concave portion, even when the vasospasm is contracted,
A space (clearance) required to allow the drug solution to flow between the vascular endothelium can be secured, and the friction between the sheath tube and the blood vessel at the time of vasospasm can be further reduced.

Further, the dilator has an outer diameter smaller than an inner diameter of the sheath tube, and has a large-diameter portion which is joined to an inner peripheral surface of the sheath tube at a predetermined position. It is possible to prevent the unilateral outflow of the chemical solution from the opening at the tip, and to promote the ejection from the slit.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a catheter introducer according to the present invention will be described with reference to the drawings. A in the figure is a catheter introducer according to the present invention, and this catheter introducer A has a hollow sheath tube 1 as shown in FIG. 1 or FIG.
And a sheath body 2 attached to the proximal end side of the sheath tube 1, and a heparin line 3 protruding from a side surface of the sheath body 2.

The sheath tube 1 is made of a suitable synthetic resin material such as fluororesin or polyurethane, and has slits 1a, 1a,. This sheath tube 1
Use an appropriate length according to the place of use and the purpose of treatment (for example, an effective length of about 16 to 18 cm).

It is preferable to use a so-called side hole sheath (SH sheath) for the sheath tube 1. For example, as shown in FIG. 2, a sheath tube having 10 to 15 slits 1a, 1a,.

The slits 1a have a length of, for example, 0.1 to 50 mm (preferably 2 to 5 mm or less).
The depth is 0.11 to 0.15 mm, and the width is a fine slit hole (preferably closer to 0). The slit hole is formed at intervals of 10 mm from the tip and at intervals of 120 degrees in the circumferential direction as shown in FIG. It is perforated spirally to open.

Also, on the surface of the sheath tube 1,
It is preferable to apply a silicone coating or a hydrophilic coating as necessary (for example, in the case of a sheath tube made of polyurethane resin).

The sheath tube 1 is removed and the frictional force between the sheath tube 1 and the vascular endothelium at the time of vasospasm is reduced so that the operation of removing the sheath tube 1 can be performed more smoothly. This is because the incidence can be reduced.

On the other hand, the sheath body 2 has a short cylindrical shape, and as shown in FIG. 2, an annular protector 2a for communicating and holding the sheath tube 1 and an annular protector 2a for communicating and holding a heparin line 3 described later. Joint pipe (tube stop) 2
b, and a valve hole (not shown) formed through an open / close valve on the rear end surface (top surface) of the sheath main body 2 to communicate with the dilator base 5.

The sheath tube 1, the joint tube (tube stopper) 2b, and the valve hole are in communication with each other. In other words, the sheath tube without leaking the chemical solution injected from the heparin line 3 described later. 1 to communicate with each other.

The heparin line 3 has, for example, a length of 175 to 185 (preferably 180) mm and an outer diameter of 2.
A conventional three-way cock (three-way switching valve) 4 is mounted on the free end side of a 52 mm synthetic resin tube.

Further, a dilator base 5 for connecting and supporting a dilator for vascular dilatation described later is detachably screwed to the top surface side of the sheath body 2 (see FIG. 1). The dilator base 5 is formed in a large-diameter lid shape in which a female spiral is engraved inside so as to be screwed to the sheath body 2.

Further, on the top surface of the dilator base 5, FIG.
As shown in the figure, an annular luer connector 5a is provided in a protruding manner. The luer connector 5a has a communication path (not shown) formed in a concentric direction to communicate with the upper end of the dilator 6, and is closed by a cap (not shown) when unnecessary.

The dilator base 5 and the cap each have a helical groove (not shown) formed on the inner peripheral surface of the lower end opening side, and project from the outer peripheral surface of the sheath body 2 and the luer connector 5a. Projections 2d, 2d (see FIG. 2), 5b, 5
b (see FIG. 4) can be easily and firmly connected to each other.

On the other hand, as shown in FIG. 4, the dilator 6 is formed of a synthetic resin hollow thin tube having a conical portion 6a having a tapered tip side.
The inner diameter of the sheath tube 1 is formed to be smaller than the inner diameter of the sheath tube 1, and a large-diameter portion 6 b is provided on the inner peripheral surface of the sheath tube 1 so as to be joined in a water-tight or coarse-dense manner.

The inner diameter of the sheath tube 1 varies depending on the French size. For example, as shown in Table 1 below, when the effective length is 170 mm,
1.40 mm (4 Fr), 1.70 mm (5 Fr),
It is preferable to use the one having 2.04 mm (6 Fr), and the outer diameter of the dilator 6 suitable for this size is as follows.
It is better to use 1.29 mm, 1.55 mm, and 1.89 mm, respectively (clearance: 0.11 m)
m, 0.15 mm, 0.15 mm).

[0029]

[Table 1]

In the catheter introducer A of the present invention configured as described above, the dilator 6 having a sharp tip is inserted into the sheath tube 1, and the conical portion 6a at the tip of the thin tube is formed.
The sheath tube 1 with the head caught is pierced from the skin S into a blood vessel B (see FIG. 5) such as an artery, and then the dilator 6 is removed, and the sheath tube 1 is placed in a state where the sheath tube 1 is inserted into the blood vessel. A catheter (not shown) is inserted to perform medical operations such as removal of occlusion of the affected part and imaging.

If the blood vessel B causes a so-called radial spasm in the initial stage or during the procedure (puncturing of the radial artery or the like and insertion of the sheath), as shown in FIG. Then, instead of the catheter, the dilator 6 is inserted into the sheath tube 1 again, the three-way cock 4 of the heparin line 3 is opened, and the syringe 7 is connected to inject a drug solution such as a vasodilator. .

At this time, the chemical solution is supplied to the sheath tube 1
Is substantially closed by the large-diameter portion 6b,
Although it flows out slightly in the distal direction, it is once pressed into the clearance between the two members, and as a result, is spouted (diffuse radiation) from the slits 1a, 1a. Since it reaches the endothelium efficiently, radiation spasm can be released immediately.

Therefore, two types of optulators (not shown) for drug release and withdrawal, which are conventionally used conventionally, are not required, and the (slit type) sheath tube 1 is not required. Therefore, the inner wall of the blood vessel is less likely to bite than the circular side hole sheath, and there is no resistance to the step on the surface.In other words, there is no resistance at the time of puncturing and removal, so the most reliable The sheath tube 1 can be pulled out easily and safely.

The sealability (water density) of the distal end opening of the sheath tube 1 differs depending on the size (outer diameter) of the large-diameter portion 6b of the distal end of the dilator 6. In other words, the sheath tube 1 Since it can be joined to the inner peripheral surface in a watertight or coarsely tight manner, it is possible to completely prevent the outflow of the drug solution from the opening at the tip of the sheath tube 1 or to suppress the amount of the drug solution to a slight amount. Needless to say, the flow rate can be adjusted.

It should be noted that the present invention is not limited to the present embodiment, but can be freely designed and changed within the scope of the present invention, and the present invention covers all of them.
For example, the shape of the sheath tube 1 and the dilator 6,
The size, length, slit position and the like are not limited to the present embodiment.

In order to effectively prevent the backflow of the chemical, a large-diameter portion (not shown) may be provided not only at the tip end of the dilator 6 but also at the middle. In addition, if various types of dilators 6 having different mounting positions (heights) of the intermediate large-diameter portion are prepared in advance, the position (height) of the intermediate large-diameter portion when inserted into the sheath tube 1 is increased. Are different from each other, the slits 1a, 1a of the sheath tube 1 are different from each other.
(The number of holes) can be regulated (while using the same sheath tube), so that it is possible to arbitrarily prevent the administration of a chemical solution other than necessary portions and adjust the ejection pressure of the chemical solution.

Further, if a concave groove (not shown) such as a spiral is provided on the peripheral surface of the dilator, when the dilator is inserted into the sheath tube 1, it may be in close contact with each other without any clearance (gap). Also, the chemical solution injected into the sheath tube 1 from the heparin line 3 communicates with the respective slits 1a, 1a,... Of the sheath tube 1 through the spiral groove, and can be jetted in the radial direction. .

Further, if the slits 1a, 1a are formed on the surface of the sheath tube 1 via a concave portion (not shown), if convulsions occur during the procedure, for example, a blood vessel such as a radial artery may be sheathed. Since the slits 1a, 1a,... Are surrounded by the concave portions even in the state where the tube 1 is tightened, in other words, the clearances are secured by the concave portions to avoid close contact with the vascular endothelium, and the slits 1a, 1a,.
As a result, a drug solution such as a vasodilator can be reliably released to the endothelium of the blood vessel, so that vasospasm can be released immediately and the sheath tube 1 can be safely removed. You can.

[0039]

The present invention is configured as described above, wherein the sheath tube has at least one slit on its surface, a dilator for vasodilation is inserted therein, and a vasodilator such as a vasodilator is inserted from the heparin line. By injecting the medicinal solution, there is no fear that the inner wall of the blood vessel will bite into the slit hole, and the resistance value at the time of puncturing / removing can be further reduced. And pressurized into the narrow clearance between the radiator and the pressure (water pressure) to make it possible to use the pressure (water pressure) to jet out (diffuse radiation) evenly and vigorously from each slit of the sheath tube.
Conventionally, two types of optulators for discharging the chemical solution and for removing the chemical solution are not required.

The slit has a length of 0.1 mm or less.
By making the depth 50 mm substantially equal to the thickness of the sheath tube, it acts as a valve only at a certain constant pressure, which is higher than the normal blood pressure, and has the effect of preventing blood from entering the sheath tube. Things.

Further, if the slit is basically formed in the longitudinal direction of the sheath tube and is angled in a predetermined direction as necessary, the slit can be formed without impairing the flexibility of the sheath tube. This has the effect of preventing easy bending against the cause.

Further, if the slit is formed on the surface of the sheath tube through a concave portion, even when the blood vessel is contracted,
Since a clearance (clearance) required to allow a drug solution to flow out from the vascular endothelium can be secured, a drug solution such as a vasodilator can be reliably released from each slit to the vascular endothelium, and vasospasm can be immediately and immediately effected. It is possible to release the sheath tube more safely and smoothly due to the effect of being able to be released, and also being able to reduce the friction between the sheath tube and the blood vessel at the time of vasospasm. This has the effect of being able to do so.

The outer diameter of the dilator is smaller than the inner diameter of the sheath tube, and the dilator is provided with a large-diameter portion at a predetermined position to be joined to the inner peripheral surface of the sheath tube. This has the effect of preventing the unilateral outflow of the chemical solution from the opening at the tip and promoting ejection from the slit.

As described above, according to the present invention, there is no fear that the inner wall of the blood vessel will bite into the side hole of the sheath tube, the resistance value at the time of puncturing and removal is further reduced, and a drug solution such as a vasodilator injected from the heparin line is used. Can be efficiently and evenly ejected from the slit of the sheath tube, and even if vasospasm occurs during the provisional procedure or procedure, it can be immediately released and the sheath tube can be safely removed. In addition, since the configuration is simple, it is suitable for mass production and can be supplied to consumers at a low price, and the practical value of implementing the present invention is enormous.

[Brief description of the drawings]

FIG. 1 is a front view of a catheter introducer according to the present invention showing a state where a dilator is inserted.

FIG. 2 is a front view of the catheter introducer showing a state where a dilator is not inserted.

FIG. 3 is an explanatory view showing a slit position of a sheath tube.

FIG. 4 is a front view of a dilator used in the present embodiment.

FIG. 5 is an explanatory diagram showing a spasm release image by the catheter introducer according to the present invention.

[Explanation of symbols]

 Reference Signs List A catheter introducer B blood vessel S skin 1 sheath tube 1a slit 2 sheath body 2a protector 2b fitting tube (tube stop) 2c upper cap 2d protrusion 3 heparin line 4 three-way cock 5 dilator base 5a luer connector 5b protrusion 6 dilator 6a cone Shaped part 6b Large diameter part 7 Syringe

Claims (5)

[Claims] 1. A catheter introducer comprising a sheath tube having a desired length and a heparin line connected to the sheath tube, wherein the sheath tube has at least one slit on a surface thereof and a vasodilator. A catheter introducer, wherein a medical solution such as a vasodilator injected from the heparin line is ejected from the slit by inserting a dilator for use in the catheter. 2. The catheter introducer according to claim 1, wherein the slit has a length of 0.1 mm to 50 mm and a depth substantially equal to the thickness of the sheath tube. 3. The catheter introducer according to claim 1, wherein the slit is formed in a predetermined direction based on the longitudinal direction of the sheath tube as needed. 4. The catheter introducer according to claim 1, wherein the slit is formed on the surface of the sheath tube via a concave portion. 5. The dilator according to claim 1, wherein an outer diameter is formed smaller than an inner diameter of the sheath tube, and a large-diameter portion is provided at a predetermined position to be joined to an inner peripheral surface of the sheath tube. Item 2. The catheter introducer according to Item 1.