JP2003305123A - Guide wire guiding tip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a guide wire guiding tip which can guide a guide wire to a hollow needle or a catheter without falling out from the wire at an inserting time of the wire to the needle or the catheter and without disturbing to advance the wire into the needle or the cavity of the catheter by a frictional resistance with the wire. <P>SOLUTION: The guide wire guiding tip 1 comprises a structure of an entirely tubular state which can be fitted in a protective case for housing and protecting the guide wire at a rear end side, a structure which can engage the hollow needle or the catheter at a distal end site, and a fixing unit 3 for fixing the wire therein. In this tip 1, the fixing unit is made of a tubular or O-ring-like member. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a guide wire guide tip for inserting a guide wire into a hollow needle, a catheter or the like.

[0002]

2. Description of the Related Art A guide wire is a catheter that is inserted into the body,
It is generally used when guiding an endoscope or the like, or when removing an indwelling catheter. When leaving the catheter in place, a guide wire is inserted into the body through a hollow needle, which serves as a guide for inserting the catheter into the body. When removing the catheter, a guide wire is inserted into the indwelling catheter, and the catheter is straightened and used as a stylet to assist withdrawal. In this way, the guide wire is inserted into the body through the lumen of the needle that has been punctured in advance, or the guide wire is inserted into the lumen of the catheter that has been inserted into the body. The inner diameter and the inner diameter of the catheter are made so as not to make as large a difference as possible in order to eliminate resistance during insertion, and the tip of the guide wire is very flexible so as not to damage the internal tissue at the tip. Has been made. As described above, the diameter difference between the outer diameter of the guide wire and the inner diameter of the hollow needle or the catheter is small, and since the tip of the guide wire is flexible and has no waist, it is very difficult to insert the guide wire into the hollow needle or the catheter. Further, when the guide wire has a J-shaped or angle-shaped distal end, it is particularly difficult to insert the guide wire into the hollow needle or catheter while straightening the guide wire distal end when inserting the guide wire into the hollow needle or catheter. Therefore, at the tip of the guide wire protection case, a guide tip with a tapered outside is provided,
It is general that a hollow needle and a rear end portion of a catheter are provided with a member whose inner lumen is gradually thickened to facilitate insertion of a guide wire. Even if the tip of the guide wire is a J-type or an angle-type, if this guide tip is used, the tip portion can be temporarily linearized within the guide tip, so that insertion into a hollow needle or a catheter is facilitated. be able to.

In order to insert a guide wire into a hollow needle and a catheter using these guide tips, first pull out the guide wire from the protective case to some extent, and then remove the guide tip from the tip of the guide wire. Being careful not to let this happen, separate the guide tip from the protective case and insert the guide tip tip into the back end of the hollow needle or catheter. Finally, grasp the exposed guide wire between the guide tip and the protective case, and gradually pull out the guide wire from the protective case in which the guide wire is spirally wound and feed it into the hollow needle or catheter from the tip of the guide tip. There is a need. However, usually
The inner surface of the guiding tip is made to reduce the frictional resistance with the guide wire so that the guide wire can be easily fed into the hollow needle or catheter, and the guide wire is protected from the spirally wound protective case. Since the guide wire is pulled out, its frictional resistance is large, and since the tip of the guide wire is very flexible and has no stiffness, there is a problem that the guide tip can be easily removed with a slight force.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to prevent the guide wire from slipping off when the guide wire is inserted into the hollow needle or the catheter, and the friction resistance with the guide wire causes the guide wire to pass through the hollow needle or the catheter lumen. Another object of the present invention is to provide a guide tip capable of guiding a guide wire to a hollow needle or a catheter without hindering the movement of the guide wire.

[0005]

That is, according to the present invention, (1) is tubular as a whole and accommodates a guide wire at a rear end portion thereof.
A guide wire guide chip having a structure that can be fitted into a protective case that protects, a structure that can fit into a hollow needle or a catheter at a tip portion, and a fixing portion that fixes a guide wire inside, (2) The guide wire guiding tip according to item (1), wherein the fixed portion is a tubular or O-ring member, and (3) the inner diameter of the tubular or O-ring member is
The guide wire guide tip according to item (2), which is smaller than the outer diameter of the guide wire by 0.01 to 0.04 mm, (4)
The ratio (F) of the maximum static friction force between the guide wire and the fixed portion to the maximum static friction force between the guide wire and the inner surface of the protective case is 1.0 <F <40.0 (1) to
(3) The guide wire guide chip according to any one of items.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in detail below with reference to the drawings. FIG. 1 schematically shows a guide wire guide tip (1) which is an embodiment of the present invention. The guide tip (1) is composed of a distal end portion (2), a guide wire fixing portion (3), and a protective case connecting portion (4) at the rear end portion, and the distal end portion (2) is a lumen of a hollow needle or a catheter. Insert and use. The outer diameter of the tip (2) depends on the inner diameter of the hollow needle or catheter into which the guide wire is inserted,
The range of 6.0 mm is preferable, and it is preferable to have a taper shape that gradually becomes thinner from the rear end toward the front end. The inner diameter of the tip (2) depends on the outer diameter of the guide wire used, but is 0.2 to 1.5 from the outer diameter of the guide wire.
A range of inner diameter larger by mm is preferred.

[0007] The guide wire fixing portion (3) is preferably a tubular or O-ring shaped component. In the case of a tubular shape, the inner diameter gradually decreases from the rear end to the distal end. May be A thermoplastic resin, a thermoplastic elastomer, a synthetic rubber or the like can be used as the material, but the guide wire does not become an obstacle for advancing the guide wire to the hollow needle or the lumen of the catheter, and the guide wire guide tip (1) is pulled out from the guide wire. In order to prevent this, it is necessary to optimally adjust the frictional force generated between the guide wire surface and the surface. Depending on the material of the guide wire surface, when the material of the guide wire surface is Teflon (R) resin, soft polyvinyl chloride resin, polyurethane resin, styrene-butadiene-ethylene copolymer, nylon elastomer, silicone rubber, Natural rubber and the like are preferable.

Further, the inner diameter and the length of the guide wire fixing portion (3) do not hinder the guide wire from advancing into the hollow needle or the lumen of the catheter, and are suitable for preventing the guide wire from coming off from the guide tip. Very important for creating resistance. The inner diameter of the fixed portion is preferably 0.01 to 0.04 mm smaller than the outer diameter of the guide wire used, and the length is preferably 1 to 10 mm, more preferably 3 to 5 mm. Further, the guide wire fixing portion (3) can be used for guide wires of any outer diameter by simply replacing the guide wire with an appropriate size according to the outer diameter of the guide wire to be used. .

The protective case connecting portion (4) is provided on the outside of the protective case to be used in order to prevent the guide wire tip from being caught in the protective case connecting portion (4) when the guide wire is advanced from the protective case to the guiding tip. It is desirable to be fitted detachably, and the inner diameter is preferably 0.1 to 0.5 mm larger than the outer diameter of the protective case of the guide wire to be used. It is also possible to taper the taper so that it gradually increases from the end to the end on the protective case connection side. In addition, in order to fix the guide wire fixing portion (3) to the distal end portion (2) in the inner cavity of the protective case connecting portion (4) connected to the distal end portion (2), the protective case connecting portion (4) It is preferable to have a convex portion (5) that abuts against the distal end portion of the protective case inserted into the inner cavity of (4), eliminates a step with the distal end portion of the protective case, and also prevents the guide wire from being caught. Convex part (5)
The height on the side of the tip (2) of the protective case is not particularly limited, but the height on the side of the protective case connection (4) is the same as the thickness on the side of the tip of the protective case connection (4) or 0.01. ~ 0.03mm
It is preferably low, and extends from the inner surface of the protective case connecting portion (4) toward the center of the inner lumen, and may have a disc shape or a substantially square shape. The outer diameter of the protective case connecting part (4) is not particularly limited, but if it is too large, the parts will be heavy and it is not economically desirable.
The range of 0 to 8.0 mm is preferable.

The tip portion (2) and the protective case connecting portion (4) can be made of a material such as a thermoplastic resin or a thermosetting resin that has a low frictional resistance with the guide wire, and the surface of the guide wire to be used. When the material of the surface of the guide wire is a Teflon (R) -based resin, polyethylene resin, polyamide resin, polypropylene resin, polyvinyl chloride resin, epoxy resin, phenol resin, etc. can be used, although it depends on the material. Tip (2)
The guide wire fixing part (3) and the guide wire fixing part (3) may be integrally formed, and further the guide wire fixing part (3) is inserted to insert the tip part (2), the protective case connecting part (4) and the guide wire fixing part (3). It may be integrally molded.

(Example 1, Comparative Example 1, and Comparative Example 2) Based on FIGS. 1 and 2, the tip portion (2) is made of polyethylene resin.
And the protective case connection part (4) is made, and the inner diameter is 0.95.
mm, and a length of 5 mm of a polyurethane resin tube is fixed as a guide wire fixing part (3) in the lumen between the tip part (2) and the protective case connecting part (4), and the guide wire guiding tip (1) was prepared and made as Example 1. As a comparative example, polyurethane tubes having inner diameters of 1.12 mm and 0.92 mm and a length of 5 mm were prepared and fixed between the tip portion (2) and the protective case connecting portion (4) prepared in Example 1. Comparative Example 1, respectively
It was set as Comparative Example 2. The guide wire guide chips of Example 1, Comparative Example 1 and Comparative Example 2 were wound on a polyethylene tube having an inner diameter of 2.8 mm, an outer diameter of 4.0 mm and a length of 1000 mm in a single plane shape with a maximum outer diameter of 160 mm. A coil spring type guide wire with an outer diameter of 0.97 mm coated with Teflon (R) resin was housed in the protective case.

Next, the protective case is firmly fixed to the base with a clamp, the guide wire tip is pulled out from the tip of the guide wire guide tip, and fixed to the chuck of the tensile tester.
The guide wire was pulled straight out at a constant speed of 3 mm / sec, and the maximum static frictional force when pulling out the guide wire from the guide wire guide tip of the example and the guide wire guide tip of the comparative example was measured. Similarly, measure the maximum static friction force when the guide wire is pulled straight out from the protective case with the guide wire guide tip removed, and use this as the maximum static friction force between the guide wire and the inner surface of the protective case. The ratio (F) of the maximum frictional resistance force between the guide wire and the guide wire guide tip lumen surface to the maximum static friction force between the protection case inner surface and the luminal surface was calculated.

Further, pull out the guide wire by hand from the protective case equipped with the guide wire guide tip, and
It was guided to a puncture needle and its inducibility was compared. The results are shown in Table 1, and in Example 1, the guide wire could be easily guided to the 18G puncture needle, but in Comparative Example 1, the guide tip fell off from the guide wire, and in Comparative Example 2, the guide wire was sent out from the guide tip. It is difficult to do 18
It could not be easily guided to the G puncture needle.

[0014]

[Table 1]

[0015]

When the guide wire guide tip of the present invention is used, the guide wire guide tip is separated from the protective case and, at the same time, the guide wire is pulled out from the protective case and the guide wire guide tip does not fall out from the guide wire. Further, when the guide wire is fed to the puncture needle, the catheter, etc., the resistance is small and the guide wire can be easily guided.

[Brief description of drawings]

FIG. 1 is a schematic view showing an overview of a guide wire guide tip according to an embodiment of the present invention.

FIG. 2 shows a cross section of a guide wire guide tip according to an embodiment of the present invention.

[Explanation of symbols]

1. Guide wire guide tip 2. Tip 3. Guide wire fixing part 4. Protective case connection 5. Convex

Claims (4)

[Claims] 1. A tubular structure as a whole, which has a structure capable of being fitted in a protective case for accommodating and protecting a guide wire at a rear end portion thereof, and a structure capable of being fitted with a hollow needle or a catheter at a distal end portion thereof. The guide wire guide chip is characterized by having a fixing portion for fixing the guide wire inside. 2. The guide wire guiding tip according to claim 1, wherein the fixing portion is formed of a tubular or O-ring member. 3. The inner diameter of the tubular or O-ring member is
The guide wire guide tip according to claim 2, which is smaller than the outer diameter of the guide wire by 0.01 to 0.04 mm. 4. The ratio (F) of the maximum static friction force between the guide wire and the fixed portion to the maximum static friction force between the guide wire and the inner surface of the protective case is 1.0 <F <40.0. The guide wire guide tip according to any one of 1 to 3.