JP3182609U - Guide wire introducer - Google Patents

Abstract

[PROBLEMS] To prevent a guide wire from rubbing on the periphery of the distal end opening of the thin tube when the guide wire is inserted into and removed from the distal end opening of the thin tube of the guide wire introducer. Provide an introducer.
A tip opening 18 of a thin tube of a guide wire introducer is formed as a flare-like opening that opens radially outward at an opening angle of 30 to 60. As a result, even if the outer peripheral surface of the guide wire that is taken in and out from the tip of the thin tube comes into contact with the inner peripheral surface of the flared opening, there is no sharp corner on the inner peripheral surface. There is no risk of generating debris such as coating.
[Selection] Figure 2

Description

  The present invention relates to a guide wire introducer inserted into a guiding catheter or the like.

  A guide wire introducer (also referred to as a guide wire inserter) is well known in Patent Documents 1-3 and the like, and the guide wire introducer securely connects a distal end of a catheter guide wire to a guiding catheter or the like connected to a Y-type connector. Used when inserting into. FIG. 4 shows a state where a guide wire introducer 10 is inserted into a general Y-type connector 1. In the figure, 2 is a connector body, 3 is a guiding catheter, 4 is a side tube, and 30 is a guide wire.

  The guide wire 30 is inserted into the Y-type connector 1 by inserting the guide wire introducer 10 with the tip of the guide wire 30 inserted in advance into the Y-type connector 1, and then leaving the guide wire 30. Only the introducer 10 is removed from the Y connector 1. The guide wire introducer 10 is generally a resin-made wire insertion portion 14 attached to one end of a stainless steel straight thin tube 12, and the tip of the guide wire 30 extends from the opening of the insertion portion 14 into a thin tube. The guide wire 30 is pulled out from the distal end portion of the thin tube 12.

JP 2004-89494 A HYPERLINK "javascript: ListSubmit (0)" Japanese Patent Application Laid-Open No. 07-155382 HYPERLINK "javascript: ListSubmit (1)" Japanese Utility Model Publication No. 62-142353

  Conventionally, the distal end of the thin tube 12 of the guide wire introducer 10 is cut at right angles to the axis as shown in FIGS. For this reason, when the guide wire 30 is taken in and out from the distal end portion of the thin tube 12, the outer peripheral surface of the guide wire 30 rubs against the peripheral edge 13 a of the opening portion 13. The outer peripheral surface of the guide wire 30 is coated with a hydrophilic polymer or the like so as to reduce friction with the thin tube 12 or the guiding catheter 3 and obtain smooth operability. It was weak against this friction, and by rubbing against the peripheral edge 13a of the opening 13, there was a possibility that a part of the coating became a fragment 30a and peeled off.

  Accordingly, an object of the present invention is to prevent the surface of the guide wire from being rubbed at the peripheral edge of the distal end opening portion of the thin tube when the guide wire is inserted into and removed from the thin tube of the introducer.

  The guide wire introducer according to the present invention is characterized in that the tip opening of the thin tube into which the guide wire is inserted is a flared opening that opens radially outward at an opening angle of 30 to 60 degrees.

  In the guide wire introducer according to the present invention, the tip opening of the thin tube is a flared opening that opens radially outward at an opening angle of 30 to 60 degrees. Even if the outer peripheral surface comes into contact with the inner peripheral surface of the flare-shaped opening, there are no sharp corners on the inner peripheral surface as in the past, so the outer peripheral surface of the guide wire is rubbed and debris such as coating is generated. There is no fear.

It is a Y type connector sectional view in the state where a guide wire introducer concerning one embodiment of the present invention was inserted. It is an expanded sectional view of the front-end | tip part of the thin tube of a guide wire introducer. It is a figure which shows the result of having done the friction test of the guide wire by making the front-end | tip opening part of the thin tube of a guide wire introducer into several flare angles. It is a side view of the Y type connector which inserted the conventional guide wire introducer. It is an expanded sectional view of the front-end | tip part of the thin tube of the conventional guide wire introducer.

  Hereinafter, the guide wire introducer 10 which concerns on one Embodiment of this invention is demonstrated. First, a general Y-type connector 1 into which the guide wire introducer 10 is inserted will be described with reference to FIG. The main body 2 of the Y-type connector 1 has a cylindrical main pipe part 2a and a branch pipe part 2b branched obliquely rearward from the main pipe part 2a. A guiding catheter 3 is coupled to the distal end portion of the main pipe portion 2a, and a side tube 4 is connected to the distal end portion of the branch pipe portion 2b. A hemostasis valve 5 is disposed inside the rear end portion of the main pipe portion 2a.

  The guide wire introducer 10 is made of a stainless steel (SUS) thin tube 12 in which one passage through which the guide wire 30 is inserted is formed, and a resin made integrally attached to the proximal end side of the thin tube 12. A wire insertion portion 14 is provided. The wire insertion portion 14 has an opening 14a whose diameter is enlarged in a trumpet shape, and the guide wire 30 can be easily inserted from the opening 14a.

  The tip of the thin tube 12 is a flare-shaped opening 18 having an opening diameter d2 and an axial length L as shown in FIG. Other configurations may be the same as those of the conventional guide wire introducer 10 shown in FIG. The opening angle of the flare-shaped opening 18 has been found to be desirably in the range of 30 degrees to 60 degrees from the test results described later.

  If the opening angle is less than 30 degrees, when the guide wire 30 exiting from the opening 18 is bent, the outer peripheral surface of the guide wire 30 may be rubbed by the peripheral edge 18a of the opening 18 and the coating may be peeled off as in the conventional case. is there. Conversely, if the opening angle of the opening 18 exceeds 60 degrees, the diameter of the opening 18 becomes too large, and other parts, particularly the hemostasis valve 5 of the Y-type connector 1 may be damaged, or the flare-shaped opening 18 may be in the way. The operability becomes worse.

  The material of the thin tube 12 of the guide wire introducer 10 is preferably made of stainless steel in consideration of rust prevention, strength, and rigidity. The inner diameter d1 of the narrow tube 12 is suitably in the range of 0.5 mm to 2.0 mm in consideration of the wire diameter of a general guide wire. The diameter d2 of the flared opening 18 is preferably 4 mm or less even when the opening angle is within 60 degrees. If it exceeds 4 mm, the hemostasis valve 5 may be damaged or the operability may be deteriorated when the hemostasis valve 5 is inserted.

  The inner surface roughness (arithmetic average roughness Ra) of the thin tube 12 is preferably 3 to 6 μm Ra. If it is rougher than 6 μm Ra, the coating of the guide wire 30 may be peeled off due to friction when the guide wire 30 comes into contact with the inner peripheral surface of the flare-shaped opening 18. On the other hand, even if the inner surface roughness is made smoother than 3 μmRa, the protective effect of the coating on the guide wire 30 is not particularly changed, and only the processing cost is increased.

  FIG. 3 shows the result of a friction test in which the opening angle θ of the flared opening 18 is divided into four stages of 0 degree, 12 degrees, 35 degrees and 60 degrees. The left side is before the test and the right side is after the test. The diameter of the guide wire used was 0.36 mm, and the guide wire was reciprocated once with a stroke of about 30 cm in a state where a guide wire introducer having an inner diameter of 0.8 mm was leveled in the air. It should be noted that the guide wire insertion / removal operation is performed both in the air before being inserted into the Y-type connector and in the liquid after being inserted into the Y-type connector. Since the coefficient of friction is higher in air than in liquid, the test in liquid was omitted in this test. As can be seen from the figure, at θ = 0 ° and 12 °, it can be seen that the coating fragments of the guide wire 30 are attached to the opening of the tip.

  On the other hand, at θ = 35 degrees and 60 degrees, coating fragments are not attached to the tip opening. Therefore, it can be seen that the opening angle of the flare opening 18 needs to be at least 30 degrees or more. Needless to say, the opening angle may be 30 degrees or more, and the shape may be a curved shape that opens outward in the radial direction. The upper limit of the opening angle is 60 degrees. This is because even if the opening angle exceeds 60 degrees, the effect that the outer peripheral surface of the guide wire 30 does not contact the peripheral edge 18a is the same as 60 degrees, and as described above, the maximum diameter d2 of the flare-shaped opening 18 This is because the hemostasis valve 5 of the Y-type connector 1 is damaged or interferes with other parts, so that the operability is deteriorated. Therefore, it is necessary to limit to 4 mm or less.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the shape of the portion where the enlarged portion of the inner peripheral surface of the flare-shaped opening 18 starts may be the R surface having a predetermined radius of curvature R. By forming such an R surface, the guide wire 30 can be smoothly put in and out, and the coating peeling of the guide wire 30 can be more reliably prevented.

1: Y-type connector 2: Connector main body 2a: Main pipe part 2b: Branch pipe part 3: Guiding catheter 4: Side tube 5: Hemostasis valve 10: Guide wire introducer 12: Narrow tube 13: Opening part 13a: Perimeter 14: Wire insertion part 14a: Opening 18: Flare opening 18: Opening 18: Flare opening 18: Tip opening 18a: Perimeter 30: Guide wire 30a: Fragment

Claims (3)

  A guide wire introducer characterized in that a tip opening of a thin tube of a guide wire introducer into which a guide wire is inserted is a flare-like opening that opens radially outward at an opening angle of 30 to 60 degrees.   The guide wire introducer according to claim 1, wherein an inner diameter of the narrow tube is set to 0.5 to 2.0 mm, and a diameter of the flare opening is set to 4 mm or less.   The guide wire introducer according to claim 1 or 2, wherein an inner surface roughness of the narrow tube is 3 to 6 µmRa.