JP3278477B2 - Vascular puncture device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vascular puncture device, for example, a vascular puncture device used when a guide wire used to introduce a catheter into a target site such as an artery or a vein is introduced into a blood vessel.

[0002]

2. Description of the Related Art Conventionally, a guide wire and a blood vessel puncturing device for introducing the guide wire into a blood vessel have been used. As a vascular puncture device, an outer tube for introducing a guide wire, an outer tube assembly having an outer tube hub fixed to the proximal end of the outer tube, and a removably inserted into the outer tube assembly, And an inner needle assembly comprising an inner needle having a puncture blade surface at a distal end, and an inner needle hub fixed to a base end of the inner needle and engaged with a rear end of the outer tube hub. Things are common. Then, as shown in FIG. 11, the blood vessel puncture device 50 has a metal inner needle projecting from the tip of the metal outer tube so that the blood vessel can be punctured together with the outer tube. In some cases, the outer tube is formed of a synthetic resin.

[0003]

However, in the above-described conventional vascular puncture device 50, a step h is formed between the tip of the metal outer tube 52 and the outer surface of the metal inner needle 51. May cause pain to the patient during puncture. Also,
Since the outer tube is formed of metal, it is difficult to form a step that eliminates the step.If such a formation is made, the outer surface of the inner needle and the inner surface of the outer tube will come into strong contact, making it difficult to remove the inner needle. Could be. Further, when an outer tube made of a synthetic resin is used, the strength may not be sufficient, and the outer tube may be bent after the inner needle is removed and before the guide wire is inserted.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to have sufficient strength, not to bend easily after the removal of the inner needle, and to reduce puncture resistance at the time of puncture, thereby facilitating puncture work. And a blood vessel puncture device that causes less pain to the patient at the time of puncture.

In order to achieve the above object, an outer tube assembly comprising an outer tube and an outer tube hub fixed to a base end portion of the outer tube is inserted through the outer tube assembly so as to be removable. And an inner needle having a puncture blade surface protruding from the outer tube at the distal end, and an inner needle hub fixed to a base end of the inner needle and engaged with a rear end of the outer tube hub. A blood vessel puncture device having an assembly, wherein the outer tube is a metal tubular body, and a resin tubular tube enclosing an outer surface of the metal tubular body and having a distal end projecting from a distal end of the metallic tubular body. The inside diameter of the distal end of the resin tubular body is smaller than the inside diameter of the metallic tubular body, and is substantially equal to the outside diameter of the inner needle.

[0006] It is preferable that the outer diameter of the distal end portion of the resin tubular body is reduced toward the distal end. Further, the outer diameter of the distal end portion of the metal tubular body is preferably reduced toward the distal end. Further, it is preferable that an annular recess is formed between the distal end surface of the metal tubular body and the resin tubular body. Further, the outer diameter of the inner needle is preferably smaller than the outer diameter of the metal tubular body. In addition, it is preferable that the tip of the resin tubular body is in close contact with the outer surface of the inner needle. It is preferable that the outer surface of the metal tubular body and the inner surface of the resin tubular body are in close contact with each other.

A vascular puncture device according to the present invention will be described with reference to an embodiment shown in the drawings. Therefore, the blood vessel puncture device of the present invention will be described with reference to the drawings. FIG. 1 is an external view of a vascular puncture device of the present invention, and FIG. 2 is an enlarged cross-sectional view of a distal end portion of the vascular puncture device shown in FIG. Vascular puncture device 1 of the present invention
Is an outer tube 3 and an outer tube hub 5 fixed to the proximal end of the outer tube 3.
An inner needle 2 having a puncture blade surface 2a protruding from the outer tube 3 at the distal end thereof, and being fixed to the proximal end of the inner needle 2. An inner needle assembly comprising a rear end of an outer tube hub 5 and an inner needle hub 4 engaged with the outer tube hub 5. The outer tube 3 is a metal tubular body 6
And a resin tubular body 7 encapsulating the outer surface of the metallic tubular body 6 and having a distal end projecting from the distal end of the metallic tubular body 6. It is smaller than the inner diameter of the tubular body 6 and substantially equal to the outer diameter of the inner needle 2.

[0008] As shown in FIG.
And an inner needle hub 4 fixed to the rear end. And the inner needle 2 has a puncture blade surface 2a at the tip,
Further, the blade surface 2a has a length that can be inserted into the outer tube 3 so that the blade surface 2a protrudes from the tip of the outer tube 3. Further, a solid-shaped inner needle 2 is used. As a material for forming the inner needle 2, stainless steel is preferable. The distal end of the inner needle hub 4 has a shape capable of engaging with the rear end of the outer tube hub 5. At the tip of the inner needle hub 4,
It is preferable to provide a mechanism for fixing the position of the tip of the blade surface of the inner needle 2 and a mechanism for preventing rotation of the inner needle. In the vascular puncture device 1 of this embodiment, as shown in FIG. The outer tube hub 5 is provided with a protruding projection 4a, and a concave portion is provided at the rear end of the outer tube hub 5 so as to engage with the projection 4a. Make up the mechanism.

As a material for forming the inner needle hub 2, a thermoplastic synthetic resin such as polypropylene, polyethylene, polycarbonate, and polystyrene, or a metal (for example, stainless steel) can be used. The inner needle 2 is fixed to the inner needle hub with an adhesive, a solvent, or the like. Further, the inner needle is heated by induction heating using a thermoplastic material as the inner needle hub to heat the inner needle. To dissolve the inner needle hub,
It may be fixed.

The outer tube assembly has an outer tube 3 temporarily placed in a blood vessel, and an outer tube hub 6 fixed to the rear end of the outer tube 3. And the outer tube 3 is, as shown in FIG.
The tip is open so that the tip of the inner needle 2 can protrude. Further, as shown in FIG. 2, the outer tube 3 includes a metal tubular body 6,
It consists of a synthetic resin tubular body 7 that covers and more preferably covers the outer surface thereof. The tip of the resin tubular body 7 projects from the tip of the metal tubular body 6, and the tip of the resin tubular body 7 The portion 7a (specifically, a portion protruding from the distal end of the metal tubular body 6) gradually decreases in outer diameter toward the distal end, and in particular, its distal end sharply decreases in diameter. I have. The inner diameter of the distal end portion 7a is substantially equal to or slightly larger or slightly smaller than the outer diameter of the inner needle 2, and a step between the distal end of the resin tubular body 7 and the outer surface of the inner needle 2 is formed. The gap is formed so that substantially no gap is formed.

Therefore, in the blood vessel puncture device 1, the inner needle 3
Since a step and a gap are not substantially formed between the outer surface of the outer tube and the distal end of the outer tube 3, there is little pain given to the patient at the time of puncturing. Further, the distal end of the outer tube 3 is formed of a resin tubular body, and the resin tubular body is more flexible than the metal tubular body. During the insertion operation into the outer tube 3, the distal end of the outer tube 3 is less likely to damage the blood vessel wall of the patient. Furthermore, since the distal end of the outer tube 3 formed of the resin-made tubular body can be elastically deformed as compared with the case where it is formed of the metal-made tubular body, it can be elastically deformed to some extent together with the guide wire. Insertion work is also easy.

Further, it is preferable that an annular concave portion 8 is formed between the distal end surface of the metal tubular body 6 and the inner surface of the distal end portion 7a of the resin tubular body 7. By providing the annular concave portion 8, the elastic deformation of the resin tubular body 7 can be made more reliable. In the vascular puncture device according to the embodiment shown in FIG. 2, the inner surface of the distal end of the metal tubular body 6 is processed so as to cut off the edge of the inner surface of the tubular body 6 so that the diameter increases toward the distal end of the tubular body 6. I have. Further, the inner surface of the portion of the resin tubular body 7 where the tip of the metal tubular body 6 is located is formed so as to decrease in diameter toward the tip of the tubular body 7. Therefore, in the blood vessel puncture device according to the embodiment shown in FIG. 2, the annular concave portion 8 has a substantially mountain-shaped cross section.

The outer tube 3 having such an annular concave portion 8 is preliminarily attached to the metal tubular member 6 and the resin tubular member 7.
Are formed so as to project so as to protrude, and are processed by a thermal mold having a tip shape as shown in FIG. Further, the outer tube 3 having the annular recess 8 as described above.
Can be formed by forming a resin-made tubular body 7 having an inner surface shape as shown in FIG. 2 in advance by die molding, and then inserting a metal tubular body 6 therein.
As shown in FIG. 6, if each of the resin tubular body 7 and the metal tubular body 6 is fixed to the outer tube hub 5, between the resin tubular body 7 and the metal tubular body 6. A slight gap may be provided, or the resin tubular body 7 and the metal tubular body 6 may be fixed to each other by an adhesive or a method such as the induction heating described above. In the blood vessel puncture device of this embodiment, the entire inner surface of the distal end portion 7a of the resin tubular body 7 has substantially the same inner diameter, and is in contact with the outer surface of the inner needle 2.
Not limited to this, only the inner surface of the distal end portion of the distal end portion 7a may be in contact with the inner needle 2.

Further, as shown in FIG. 3, the distal end of the blood vessel puncture device may be formed. In the blood vessel puncturing device of this embodiment, the distal end of the metal tubular body 6 is formed so as to gradually decrease in diameter toward the distal end. By forming in this manner, the outer tube 3 at the distal end of the metal tubular body 6 is formed.
Changes in the physical properties of the outer tube 3, the elastic deformation of the distal end 3 a of the outer tube 3 is likely to occur, and the distal end 7 a of the resin tubular body 7 can be prevented from being bent. Then, as shown in FIG.
It is preferable that not only the distal end portion 7a but also the entire distal end portion 3a of the outer tube 3 be formed such that the diameter thereof gradually decreases toward the distal end. 2, the blood vessel puncture device according to this embodiment has an annular recess 8 between the distal end surface of the metal tubular body 6 and the inner surface of the distal end portion 7a of the resin tubular body 7. It is preferable to have In the vascular puncture device according to the embodiment shown in FIG. 3, unlike the one shown in FIG. 2, the inner surface of the distal end of the metal tubular body 6 is not processed, and the metallic tubular body 6 is not processed.
Is a plane perpendicular to the axis of the tubular body 6. 2, the inner surface of the portion of the resin tubular body 7 where the tip of the metal tubular body 6 is located is formed so as to reduce the diameter toward the tip of the tubular body 7. I have. Therefore, in the blood vessel puncture device of the embodiment shown in FIG. 3, the annular concave portion 8 has a wedge-shaped cross-sectional shape that becomes thinner toward the distal end of the tubular body 7.

Further, as shown in FIG. 4, the distal end of the blood vessel puncture device may be formed. The blood vessel puncture device of this embodiment does not have the above-mentioned annular concave portion, and the distal end of the metal tubular body 6 gradually decreases in diameter toward the distal end, and the resin tubular body 7 has the distal end. Not only the portion 7a but also the entire distal end portion 3a of the outer tube 3 is formed so as to gradually decrease in diameter toward the distal end. Outer tube 3 having such a structure
Is to form a metal tubular body 6 and cover the outer surface thereof with a resin tubular body formed in advance, or to insert a metal core into the metal tubular body 6 so that the molten metal liquid for forming the resin tubular body can be used. After forming the resin-made tubular body by immersing the resin into the resin, the tip can be formed by heating using a mold. Further, as described above, after the resin tubular body 7 having the inner surface shape as shown in FIG. 4 is formed in advance by die molding, the metal tubular body 6 may be inserted into the inside. .

Further, as shown in FIG. 5, the distal end of the blood vessel puncture device may be formed. In the vascular puncture device of this embodiment, the inner surface of the distal end portion of the metal tubular body 6 is processed so that the outer diameter gradually increases toward the distal end. An annular concave portion 8 is formed between the inner surface of the distal end portion 7a and the inner surface. In the vascular puncture device according to the embodiment shown in FIG. 5, similarly to the vascular puncture device shown in FIG. 2, the inner surface of the distal end of the metal tubular body 6 expands toward the distal end of the tubular body 6. It is machined so as to remove the inner edge. The inner surface of the portion of the resin tubular body 7 where the distal end faces of the metallic tubular body 6 face or contact each other is a plane perpendicular to the axis of the tubular body 7. Therefore, in the vascular puncture device according to the embodiment shown in FIG. 5, the annular concave portion 8 has a wedge-shaped cross-sectional shape that becomes thinner toward the rear end of the tubular body 6.

Further, as shown in FIG. 10, the distal end of the blood vessel puncture device may be formed. The blood vessel puncture device of this embodiment does not have the above-mentioned annular concave portion, and the distal end of the metal tubular body 6 gradually decreases in diameter toward the distal end, and the resin tubular body 7 has the distal end. The portion 7a is formed so as to gradually decrease in diameter toward the tip. Also,
In the vascular puncture device according to the embodiment shown in FIG. 10, the inner surface of the distal end of the metal tubular body 6 is machined so as to cut off the edge of the inner surface of the tubular body 6 so as to increase in diameter toward the distal end of the tubular body 6. The inner surface of the portion of the resin tubular body 7 where the distal end faces of the metal tubular body 6 of the resin tubular body 7 face or contact each other is formed so as to cover the entire distal end of the metal tubular body 6. . Thereby, the tip of the metal tubular body 6 is
Since it is not substantially exposed to the outer surface, the portion where the tip of the metal tubular body 6 is located is formed by the inner surface of the resin tubular body 7, and the inserted guide wire is formed of the resin tubular body 7. Since it comes into contact with the inner surface and does not come into contact with the distal end portion of the metal tubular body 6, resistance during insertion is reduced, which is preferable.

In the outer tube 3 having such a structure, a metal tubular body 6 is formed, and its outer surface is covered with a resin tubular body formed in advance, and a metal core is inserted into the metal tubular body 6. After the resin tubular body is formed by dipping in a molten resin liquid for forming a resin tubular body, the tip can be formed by heating using a mold. Alternatively, it can be formed by forming a resin tubular body 7 having an inner surface shape as shown in FIG. 10 in advance by die molding, and then inserting a metal tubular body 6 therein.

As the resin tubular body 6, ETFE, PT
It is formed of a fluorine resin such as FE, FEP, or PFA, or an olefin resin such as polypropylene or polyethylene, and has some flexibility. The outer diameter of the outer tube is generally about 0.9 to 2.0 mm. Further, a resin tubular body 7 protruding from the tip of the metal tubular body 6
Is preferably about 0.5 to 25.0 mm. Furthermore, 2 to 30 are contained in the material for forming the resin tubular body 6.
%, A substance containing about X% of a radiopaque substance (for example, barium sulfate, bismuth subcarbonate, etc.) may be used. Further, in order to further reduce the penetration resistance of the outer tube 3, it is preferable to coat the outer surface of the outer tube 3 (the outer surface of the resin tubular body 7) with a substance (for example, silicone) that reduces frictional resistance. . Further, in order to reduce the frictional resistance between the outer surface of the inner needle 3 and the inner surface of the outer tube 3, particularly, the inner surface of the resin-made tubular body 7, the substance (for example, silicone, ETFE) which reduces the frictional resistance is used. , PTFE, F
It is preferable to coat with a fluorine-based resin such as EP or PFA.

Further, as the metal tubular body 6, a tubular body formed of stainless steel (preferably, stainless steel for spring) can be suitably used. When such an elastic metal tube is used as the metal tubular body 6, it is preferable that the rigidity of the base side of the metal tubular body 6 is high and the distal end side is flexible. By doing so, the operability is further improved.

Next, the outer tube hub 5 will be described. The outer tube hub 5 has a lumen through which the inner needle 2 can be inserted as shown in FIG.
It has a shape that can be engaged with. The outer tube hub 5 is formed with a grip portion 5a at the middle portion in the longitudinal direction for gripping the vascular puncture device 1 at the time of puncturing. A portion with an increased inner diameter for fixing is formed. Then, the resin tubular body 7
At the rear end, an annular flange 7b is formed as shown in FIG. 6, and the rear end of the metal tubular body 6 protrudes from the rear end of the resin tubular body 7. In this state, the resin-made tubular body 7 and the metal-made tubular body 6 are inserted into the distal end portion of the outer tube hub 5, and the gap between the tubular members 6, 7 and the outer tube hub is filled with an adhesive agent. 11 is filled,
The outer tube 3 is fixed to the outer tube hub 5 by this adhesive. Alternatively, a metal pipe shorter than the rear end of the outer pipe may be inserted, and the metal pipe may be used for fixing by caulking.

Next, the blood vessel puncturing device of the embodiment shown in FIG. 7 will be described. The substantial difference between the vascular puncture device 20 of this embodiment and the vascular puncture device 1 of the above-described embodiment is as follows.
The inner needle is formed of a hollow body. And
The vascular puncture device 20 includes an outer tube assembly including an outer tube 23 and an outer tube hub 25 fixed to the proximal end of the outer tube 23;
The outer tube assembly is detachably inserted into the outer tube assembly, and the outer tube 23
Hollow inner needle 22 having piercing blade surface 22a that protrudes more
And an inner needle assembly fixed to the proximal end of the inner needle 22 and comprising the inner needle hub 24 engaged with the rear end of the outer tube hub 25. A tubular member 31 is fixed to the rear end of the outer tube hub 25.
And an elastic valve body 32 that allows a rod-shaped body to pass therethrough and closes the lumen of the outer tube hub 25.
have.

As shown in FIG. 8, the outer tube 23 includes a metal tubular body 26 and a resin that covers the outer surface of the metallic tubular body 26 and has a tip projecting from the tip of the metal tubular body 26. And a tubular body 27 made of resin.
Is smaller than the inner diameter of the metal tubular body 26,
In addition, it is substantially equal to the outer diameter of the inner needle 22.

The inner needle assembly is, as shown in FIG.
2, the inner needle hub 24 fixed to the rear end thereof, and the inner needle hub 2
4 and a cap 33 detachably attached to the rear end. The inner needle 22 has a puncturing blade surface 22a at the distal end, and has a length that can be inserted through the outer tube 23 so that the blade surface 22a protrudes from the distal end of the outer tube 23, and has a hollow shape. Things are used. Therefore, the fundamental difference between the blood vessel puncture device 20 of this embodiment and the one shown in FIG. 1 is that the inner needle has a hollow shape.
The distal end of the inner needle hub 24 has a shape capable of engaging with the rear end of the tubular member 31 attached to the rear end of the outer tube hub 25. At the rear end of the cap 33, a filter 34 that allows air to pass and does not allow blood to pass is provided. By providing this filter, blood flowing in from the inner needle 22 can be prevented from flowing out. Further, in the vicinity of the engagement portion between the inner needle hub 24 and the tubular member 31,
It is preferable to provide a protruding portion 24a serving as a mechanism for fixing the position of the blade surface of the inner needle 22 and a mechanism for preventing rotation of the inner needle.

It is preferable that the inner needle hub 24 and the cap 33 have such transparency that the inflow of blood can be confirmed so that flashback (inflow of blood into the inner needle hub) can be visually confirmed. As a material for forming the inner needle hub 24, a thermoplastic synthetic resin such as polypropylene, polyethylene, polycarbonate, or polystyrene can be used. In particular, the above-mentioned resins having a certain degree of transparency are preferable. In addition, the inner needle 22 and the inner needle hub are fixed with an adhesive, a solvent, or the like. Furthermore, the inner needle is heated by induction heating using a thermoplastic material as the inner needle hub to heat the inner needle. May be used to dissolve the inner needle hub and fix it.

The outer tube assembly has an outer tube 23 temporarily inserted into a blood vessel, and an outer tube hub 25 fixed to the rear end of the outer tube 23. As shown in FIGS. 7 and 8, the outer tube 23 has a distal end and an opening having a diameter that allows the distal end of the inner needle 2 to protrude. Further, as shown in FIG. 8, the outer tube 23 is composed of a metal tubular body 26 and a synthetic resin tubular body 27 covering the outer surface thereof. The tip 27a of the resin tubular body 27 (specifically, the portion projecting from the tip of the metal tubular body 26) gradually decreases in outer diameter toward the tip. In particular, the tip
The diameter is sharply reduced. The inner diameter of the distal end portion 27a is substantially the same as or slightly larger or slightly smaller than the outer diameter of the inner needle 22, and a step between the distal end of the resin tubular body 27 and the outer surface of the inner needle 22 is formed. The gap is formed so that substantially no gap is formed.

Therefore, in the vascular puncture device 20, since a step and a gap are not substantially formed between the outer surface of the inner needle 22 and the distal end of the outer tube 23, pain given to the patient at the time of puncture is small. Further, the distal end of the outer tube 23 is formed of a resin tubular body, and the resin tubular body is more flexible than the metal tubular body. During the operation of insertion into the outer tube 23, the distal end of the outer tube 23 can be less likely to damage the blood vessel wall of the patient. Furthermore, since the distal end of the outer tube 23 formed of the resin-made tubular body can be elastically deformed as compared with the case formed of the metal-made tubular body, it can be elastically deformed to some extent together with the guide wire. Insertion work is also easy.

Further, it is preferable that an annular recess 28 is formed between the distal end surface of the metal tubular body 26 and the inner surface of the distal end portion 27a of the resin tubular body 27. By providing the annular concave portion 28, the elastic deformation of the resin tubular body 27 can be made more reliable. The outer tube 23 having the annular concave portion 28 can be formed by the above-described method. In the vascular puncture device of this embodiment, the entire inner surface of the distal end portion 27a of the resin tubular body 27 has substantially the same inner diameter and is in contact with the outer surface of the inner needle 22. The invention is not limited thereto, and only the inner surface of the distal end portion of the distal end portion 27a may contact the inner needle 22.

Further, as shown in FIG. 9, the distal end of the blood vessel puncture device may be formed. In the blood vessel puncture device of this embodiment, the distal end of the metal tubular body 26 is formed so as to gradually decrease in diameter toward the distal end. By forming in this manner, the change in the physical properties of the outer tube 23 at the distal end portion of the metal tubular body 26 becomes gentle, and the outer tube 2
The elastic deformation of the distal end portion 23a of the third tubular member 3 is easily caused, and the distal end portion 27a of the resin tubular body 27 can be prevented from being bent. As shown in FIG. 9, the resin tubular body 27 is preferably formed so that not only the distal end portion 27a but also the entire distal end portion 23a of the outer tube 23 gradually decreases in diameter toward the distal end. FIG.
As shown in the above, the vascular puncture device of this embodiment is:
An annular recess 28 is provided between the distal end surface of the metal tubular body 26 and the inner surface of the distal end 27a of the resin tubular body 27.
The structure of the distal end portion of the blood vessel puncture device 20 may be the structure shown in FIGS. 4, 5, and 10.

As the resin tubular body 26, ET is used.
It is formed of a fluorine-based resin such as FE, PTFE, FEP, or PFA, or an olefin-based resin such as polypropylene or polyethylene, and has some flexibility. The outer diameter of the outer tube is generally about 0.9 to 2.0 mm. The length of the resin tubular body 27 protruding from the tip of the metal tubular body 26 is preferably about 0.5 to 25.0 mm. Further, a material containing about 2 to 30% of an X-ray opaque substance (for example, barium sulfate, bismuth subcarbonate, or the like) in the material for forming the resin tubular body 26 may be used. Furthermore, in order to further reduce the penetration resistance of the outer tube 23, it is preferable to coat the outer surface of the outer tube 23 (the outer surface of the resin tubular body 7) with a substance (for example, silicone) that reduces frictional resistance. . Further, in order to reduce the frictional resistance between the outer surface of the inner needle 22 and the inner surface of the outer tube 23, particularly the inner surface of the resin tubular body 27 in contact therewith, a substance (for example, silicone, silicone,
It is preferable to coat with a fluorine-based resin such as ETFE, PTFE, FEP and PFA). Further, as the metal tubular body 26, a tubular body formed of stainless steel (preferably, stainless steel for spring) can be suitably used.

As shown in FIG. 7, the outer tube hub 25 has a tubular member 31 at the rear end. In the tubular member 31, an elastic valve 32 is provided. Is partially closed. The elastic valve body 32 has a disk shape, and has an insertion portion through which the inner needle 22 and the guide wire can be inserted in a liquid-tight state. When the inner needle 22 and the guide wire are not inserted, the insertion portion closes and shuts off the blood flow.

As the elastic valve body 32 having such a function, for example, silicone rubber, butadiene rubber, styrene-based elastomer (for example, SBS elastomer,
A disk-shaped member made of a flexible material such as EBS elastomer is preferably used, and a so-called Y-cut or cross-cut can be used as the insertion portion formed in the elastic valve body 32. Particularly preferably, the disk-shaped portion is cut straight from both upper and lower surfaces, and a first cut portion and a second cut portion that intersect at the center are provided.

As a material for forming the outer tube hub, a thermoplastic synthetic resin such as polypropylene, polyethylene, polycarbonate, or polystyrene can be used. In particular, the above-mentioned resins having a certain degree of transparency are preferable. The fixing of the outer tube 23 and the outer tube hub 25 is performed as shown in FIG.
Can be performed by the method described above.

Next, the operation of the vascular puncture device of the present invention will be described. First, in a state before use, in the vascular puncture device 1, the inner needle 2 is inserted into the outer tube 3 via the outer tube hub 5, as shown in FIG. Inner needle hub 4 is outer tube hub 5
When the inner needle 2 is engaged with the rear end, the cutting edge 2a of the inner needle 2 projects from the tip of the outer tube 3 and punctures a blood vessel or the like. In this state, the vascular puncture device 1 is punctured into a blood vessel by holding the outer tube hub 5. Then, the inner needle assembly is removed from the outer tube assembly. Thereby, it is confirmed that the blood flows out through the inside of the outer tube 3 and puncture into the blood vessel has been completed. Then, insert the guide wire into the outer tube 3,
After inserting a part of the guide wire into the blood vessel, the outer tube assembly is removed from the blood vessel, and then a catheter for angiography, vasodilation, etc. is introduced into the blood vessel so as to cover the guide wire. .

[0035]

The vascular puncture device according to the present invention has an outer tube assembly comprising an outer tube and an outer tube hub fixed to the proximal end of the outer tube, and is removably inserted into the outer tube assembly. An inner needle having a puncture blade surface protruding from the outer tube at the distal end, and an inner needle hub fixed to a base end of the inner needle and engaged with a rear end of the outer tube hub. A vascular puncture device having an inner needle assembly, wherein the outer tube is a metal tubular body, and a resin that covers the outer surface of the metallic tubular body and has a distal end projecting from the distal end of the metallic tubular body. Since the inner diameter of the distal end of the resin tubular body is smaller than the inner diameter of the metal tubular body and substantially equal to the outer diameter of the inner needle, the blood vessel puncture device In this case, since a step and a gap are not substantially formed between the outer surface of the inner needle and the distal end of the outer tube, the Less painful to give. Further, the distal end of the outer tube is formed of a resin tubular body, and the resin tubular body has more flexibility than the metal tubular body. During the insertion operation, the distal end of the outer tube does not damage the blood vessel wall of the patient. Furthermore, since the distal end of the outer tube formed by the resin-made tubular body can be elastically deformed as compared with the case formed by the metal-made tubular body, it can be elastically deformed to some extent together with the guide wire. The work is also easy.

[Brief description of the drawings]

FIG. 1 is an external view of a vascular puncture device of the present invention.

FIG. 2 is an enlarged partial cross-sectional view of a distal end portion of the vascular puncture device according to one embodiment of the present invention.

FIG. 3 is an enlarged partial sectional view of a distal end portion of a vascular puncture device according to another embodiment of the present invention.

FIG. 4 is an enlarged partial cross-sectional view of a distal end portion of a vascular puncture device according to another embodiment of the present invention.

FIG. 5 is an enlarged partial sectional view of a distal end portion of a vascular puncture device according to another embodiment of the present invention.

FIG. 6 is an enlarged sectional view of a rear end portion of the vascular puncture device according to one embodiment of the present invention.

FIG. 7 is a central partial cross-sectional view of another embodiment of the vascular puncture device of the present invention.

FIG. 8 is an enlarged partial cross-sectional view of a distal end portion of a vascular puncture device according to another embodiment of the present invention.

FIG. 9 is an enlarged partial cross-sectional view of a distal end portion of a blood vessel puncture device according to another embodiment of the present invention.

FIG. 10 is an enlarged partial cross-sectional view of a distal end portion of a blood vessel puncture device according to another embodiment of the present invention.

FIG. 11 is an enlarged partial cross-sectional view of a distal end portion of a conventional vascular puncture device.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 blood vessel puncturing device 2 inner needle 3 outer tube 4 inner needle hub 5 outer tube hub 6 metal tubular body 7 resin tubular body 8 annular recess 20 vascular puncture device 22 inner needle 23 outer tube 24 inner needle hub 25 outer tube hub 26 Metal tubular body 27 Resin tubular body 31 Tubular member 32 Elastic valve body 33 Cap 34 Filter

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61M 5/158 A61M 25/00 420

Claims (7)

(57) [Claims] 1. An outer tube assembly comprising an outer tube and an outer tube hub fixed to a base end of the outer tube, an outer tube assembly removably inserted into the outer tube assembly, and a distal end provided with the outer tube. A blood vessel having an inner needle having a more protruding piercing blade surface, and an inner needle assembly fixed to a proximal end of the inner needle and engaged with a rear end of the outer tube hub. A puncture device, wherein the outer tube includes a metal tubular body, and a resin tubular body that covers the outer surface of the metal tubular body and has a distal end projecting from the distal end of the metallic tubular body. The inner diameter of the tip of the resin tubular body is smaller than the inner diameter of the metal tubular body,
A blood vessel puncture device characterized in that the diameter is substantially equal to the outer diameter of the inner needle. 2. The vascular puncture device according to claim 1, wherein the outer diameter of the distal end portion of the resin tubular body is reduced toward the distal end. 3. The vascular puncture device according to claim 1, wherein the outer diameter of the distal end portion of the metal tubular body is reduced toward the distal end. 4. An annular recess is formed between a distal end surface of the metal tubular body and the resin tubular body.
4. The vascular puncture device according to any one of items 1 to 3. 5. The vascular puncture device according to claim 1, wherein an outer diameter of the inner needle is smaller than an outer diameter of the metal tubular body. 6. The blood vessel puncture device according to claim 1, wherein a distal end of the resin tubular body is in close contact with an outer surface of the inner needle. 7. The blood vessel puncture device according to claim 1, wherein an outer surface of the metal tubular body and an inner surface of the resin tubular body are in close contact with each other.