JP2545856Y2 - Catheter introducer - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a catheter introducer for introducing a catheter into a blood vessel.

[0002]

2. Description of the Related Art Conventionally, a catheter introducer has been used as an instrument for introducing an angiographic catheter or the like into a blood vessel. FIG.
FIG. 1 is a perspective view of a catheter introducer disclosed in Japanese Patent Application Publication No. 9-210, in which 1 is a catheter introducer, 2 is a sheath portion, 3 is a dilator portion, 4 is a sheath hub, 5 is a sheath, 6 is a female prismatic portion, and 7 is A dilator hub, 8 is a dilator, 9 is a male prism, and 10 is a side tube.
As shown in the figure, the catheter introducer 1 includes a sheath portion 2 having a sheath 5 and a sheath hub 4, and a dilator portion 3 having a dilator 8 and a dilator hub 7. The catheter introducer 1 has a dilator section 3 set in a sheath section 2 and is inserted into a blood vessel through a guide wire.

FIG. 7 and FIG. 8 are explanatory views showing the use situation of the above-mentioned catheter introducer, in which 11 is a three-way cock,
12 is a guide wire, 13 is a subcutaneous tissue, and 14 is a blood vessel. In using the catheter introducer, a hollow needle (not shown) into which the inner needle has been inserted is introduced into the blood vessel 14, and then the guide wire 12 is inserted through the hollow needle from which the inner needle has been removed. It is removed and only the guide wire 12 remains. Next, as shown in FIG.
Is inserted into the blood vessel 14 using the guide wire 12 as a guide, and the sheath 5 of the catheter introducer 1 is inserted into the blood vessel 14 as shown in FIG. Then, the catheter is inserted into the sheath 5 to guide the distal end of the catheter into the blood vessel 14, and the insertion of the catheter into the blood vessel 14 is completed. Thereafter, if necessary, the three-way cock 11 is operated to replenish the sheath portion with a drug solution or the like.

By the way, when inserting the catheter introducer 1 into which the dilator 3 has been inserted into the blood vessel 14 with the guide wire 12 as a guide, the sheath 2 is inserted into the blood vessel 14 while rotating it to the right and left. It can be done easily. However, for this purpose, it is necessary to provide an engaging means for stopping the relative rotation between the dilator section 3 and the sheath section 2 and for preventing the displacement in the axial direction.

As a means for stopping the relative rotation and the axial displacement between the dilator section 3 and the sheath section 2 as described above, several examples are conventionally disclosed. An example will be described below. (a) The one shown in FIG. 9 is described in Japanese Patent Application Laid-Open No. 2-289269, in which the male fitting part 15 of the dilator part 3 and the female fitting part 16 of the sheath part 2 are tapered. And a hexagonal cross section. The rotation of the sheath 2 and the dilator 3 can be prevented while preventing displacement in the axial direction by the taper fitting.

(B) The examples shown in FIGS. 10 and 11 are described in the same Japanese Patent Application Laid-Open No. 2-289269.
0 is a front view of an end portion of the sheath portion 2 provided with the female tapered portion 17 having the concave portion 18, and FIG. 11 is a side view of the dilator portion 2 provided with a male tapered portion 19 provided with the convex portion 20. The male taper portion 19 of the dilator portion is inserted into the female taper portion 17 of the sheath portion to prevent displacement in the axial direction by the taper portion 17 and to prevent the relative rotation by engaging the convex portion 20 with the concave portion 18. It is something to do.

(C) Japanese Patent Publication No. 3-37430 shown in FIG.
The sheath disclosed in Japanese Unexamined Patent Application Publication No. H10-260,
The male prism 9 is provided on the dilator 3, and the male prism 9 of the dilator 3 is inserted into the female prism 6 of the sheath 2, and the dilator 3 and the sheath 2 are connected to each other. It is configured not to perform relative rotation. Also female female prism 6
A groove 6a is formed in the male prism 9 and a rib 9a is formed in the male prism 9 so that when the male prism 9 of the dilator is fitted into the female prism 6 of the sheath, the male prism is formed. The rib 9a of 9 fits into the groove 6a of the female prism 6 of the sheath to prevent the dilator 3 and the sheath 2 from being displaced in the axial direction.

(D) Further, the example shown in FIG.
No. 112849, a spiral convex portion 21 is formed on the outer peripheral portion of the end portion 2a of the sheath portion, and the convex portion 21 of the sheath portion is inserted into the end portion 3a of the dilator portion 3. The dilator 3 is screwed to the sheath 2.

[0009]

As described above, some means for engaging the dilator and the sheath have been developed, but a complete means has not yet appeared. That is, (a)
Those engaged by the tapered portions shown in (1) and (2) have a weak locking force and are unstable, and may come off during use. (b) The one provided with the uneven portion shown in (c) has solved this disadvantage to some extent,
It is necessary to keep a sufficient distance to the fitting surface in order to ensure the engagement by the fitting of the concave and convex portions, and as a result, the depth D from the end face of the sheath portion to the check valve increases. Therefore, when inserting a guide wire or a catheter having a bent tip into the sheath portion, as shown in FIG. 13, the tip of the catheter is deviated from the center of the check valve, making insertion difficult. Furthermore, the example shown in (d) solves the above-mentioned drawback, but it is necessary to turn a screw to attach and detach the dilator and sheath, operation with both hands is indispensable, and it is difficult to operate with difficulty. Has become. Further, when the dilator is rotated in a normal state in which the sharp tip of the dilator presses the inner wall of the blood vessel, the sharp tip may damage the inner wall of the blood vessel.

The present invention has been made to solve the above-mentioned problems in the conventional catheter introducer, and the dilator and the sheath can be quickly and smoothly attached and detached only by pressing without rotating relative to each other. The present invention seeks to provide a catheter introducer that can be used.

[0011]

The catheter introducer according to the present invention is a catheter introducer comprising a sheath hub having a circular cross-section and a sheath portion comprising a sheath, and a dilator hub and a dilator portion comprising a dilator. A ring-shaped groove formed along the inner circumference or the outer circumference of either the inner circumference of the flange provided at the end of the dilator portion so as to be fitted to the end of the sheath hub or the outer circumference of the sheath hub. And either the outer periphery of the sheath hub or the inner periphery of the flange,
A ring-shaped protrusion that engages with the groove is provided, and the ring-shaped groove and the ring-shaped protrusion can be easily attached and detached only by pressing, without relatively rotating the ring-shaped groove and the ring-shaped protrusion using the elastic deformation of the flange. It was made.

[0012]

Since the catheter introducer is configured as described above, when inserting the catheter introducer with the dilator into the blood vessel, the sheath is inserted into the groove formed in either the dilator or the sheath. If the convex part formed on any of the dilator parts is engaged, the dilator part and the sheath part are integrated, and even if the catheter is inserted into the blood vessel while gripping the sheath part and rotating left and right, The dilator and the sheath do not rotate relative to each other or displace in the axial direction. When the dilator is to be detached from the sheath, the tilter hub is slightly inclined to disengage the two, and if the dilator hub is pulled, the two can be easily detached without rotating relative to each other.

[0013]

FIG. 1 is a sectional view of a catheter introducer showing an embodiment of the present invention, FIG. 2 is a perspective view thereof, and FIG. 3 is an enlarged view of a main part thereof. In the figure, 31 is a catheter introducer,
32 is a sheath portion, 33 is a dilator portion, 34 is a sheath hub, 35 is a sheath, 36 is a dilator hub, 37 is a flange, 38 is a dilator, 39 is an annular convex portion, and 40 is a groove portion. As shown in the figure, the catheter introducer according to the present invention forms a flange 37 having an annular convex portion 39 on an inner peripheral portion at an end of a dilator portion 33,
A groove 40 is formed on the outer periphery of the end of the sheath hub 34 of the sheath portion 32 so as to engage with the annular projection 39, and a plurality of cutouts 41 are formed in the flange 37 in the axial direction. The groove 40 needs to be formed so as to fit with any part of the annular projection 39. Further, the annular convex portion 39 may be formed on the outer peripheral portion of the sheath hub 34 of the sheath portion, and the groove portion 40 may be formed on the inner peripheral portion of the flange 37.

When inserting the catheter introducer into the blood vessel, as shown in the figure, the dilator 38 of the dilator section 33 is inserted through the sheath 35 of the sheath section 32, and the dilator hub 33 is pushed in the axial direction against the sheath hub 34. For example, since both the flange 37 and the dilator hub 34 are formed of soft plastics, the flange 37 is elastically deformed and is covered over the outer peripheral portion of the sheath hub 34, and the annular convex portion 39 is engaged with the groove 40 of the sheath hub. Combine. As a result, the dilator section 33 and the sheath section 32 are integrated, and even if the sheath section is gripped and rotated left and right, the dilator section 33 and the sheath section 32 do not relatively rotate, and are displaced in the axial direction. Nothing to do. Therefore, insertion of the catheter introducer into a blood vessel is performed smoothly and easily. In order to separate the dilator section 33 from the sheath section 32, if the end of the dilator hub 36 opposite to the flange 37 is lightened in the direction perpendicular to the axial direction, the flange projection 3
9 is disengaged from the groove 40 of the sheath hub.

Embodiment 2 FIG. 4 is a perspective view showing another embodiment. In this embodiment, a plurality of point-like projections 42 are formed on the outer periphery of a sheath hub 34 and the inner periphery of a flange 37. And a groove 43 which engages with the point-like projection 42. FIG. 5 shows an example of an annular convex portion 44 partially missing instead of the point convex portion 42 in the above embodiment. In any case, a notch 41 is formed in the flange 37.

[0016]

According to the present invention, a catheter introducer is provided with a flange which covers a sheath hub on a dilator hub of the dilator portion, and a projection and a groove which engage with each other with the flange and the sheath hub. When inserting a catheter into a blood vessel, the dilator and the sheath rotate relative to each other or displace in the axial direction even when the catheter is grasped and inserted while rotating the catheter in the left and right direction. No longer occurs, and the catheter introducer has an excellent effect of being easily and reliably inserted into a blood vessel. Also, when the sheath is left in the blood vessel,
It was possible to quickly and easily release the engagement between the sheath portion and the dilator portion, to remove the sharp end of the dilator from the sheath without rotating the sharp tip in the blood vessel, and to obtain high safety that damage to the inner wall of the blood vessel could be prevented. .

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a catheter introducer showing an embodiment of the present invention.

FIG. 2 is a perspective view of the catheter introducer.

FIG. 3 is an enlarged perspective view of a main part of the catheter introducer.

FIG. 4 is a perspective view of a main part of a catheter introducer showing another embodiment of the present invention.

FIG. 5 is a perspective view of a main part of a catheter introducer showing another embodiment of the present invention.

FIG. 6 is a side view of a catheter introducer.

FIG. 7 is an explanatory view showing an example of use of a catheter introducer.

FIG. 8 is an explanatory diagram showing an example of use of a catheter introducer.

FIG. 9 is a perspective view of a main part of a conventional catheter introducer.

FIG. 10 is a front view of a sheath hub of a conventional catheter introducer.

FIG. 11 is a side view of a dilator section of a conventional catheter introducer.

FIG. 12 is a cross-sectional view showing engagement between a dilator section and a sheath section of a conventional catheter introducer.

FIG. 13 is an explanatory diagram showing a state of the guide wire and the catheter when the guide wire and the catheter are inserted into the sheath of the catheter introducer.

[Explanation of symbols]

 31 ... catheter introducer 32 ... sheath part 33 ... dilator part 34 ... sheath hub 35 ... sheath 36 ... dilator hub 37 ... flange 39 ... annular convex part 40 ... groove part 41 ... notch 42 ... … Point-shaped protrusion 43… Groove 44… Partially chipped annular protrusion

Claims (4)

(57) [Scope of request for utility model registration] 1. A cross section in the catheter introducer juicer constituted by the dilator section consisting of the sheath portion and Dairetahabu and dilator consisting of circular sheath hub and the sheath, the dilator section to be capped on the ends of the sheath hub Either along the inner circumference or the outer circumference of either the inner circumference of the flange provided at the end or the outer circumference of the sheath hub.
Ring-shaped groove formed in the outer periphery of the sheath hub or the inner periphery of the flange.
One of them is provided with a ring-shaped projection engaging with the groove.
The ring-like shape using the elastic deformation of the flange.
Relative rotation of the groove and the ring-shaped protrusion.
A catheter introducer characterized in that it can be easily attached and detached only by pressing . 2. The catheter introducer according to claim 1, wherein the protrusion is formed over the entire outer circumference of the sheath hub or the inner circumference of the flange. 3. The catheter introducer according to claim 1, wherein the convex portion is partially formed over the entire outer periphery of the sheath hub or the entire inner periphery of the flange. 4. The catheter introducer according to claim 1, wherein the projections are arranged in a dotted pattern over the entire outer periphery of the sheath hub or the inner periphery of the flange.