JP5519637B2 - Guidewire and guidewire insertion system - Google Patents

Description

  The present invention relates to a guide wire and a guide wire insertion system used when a catheter, in particular, a central venous catheter is placed in a blood vessel.

  Conventionally, there is a Seldinger method as a method for placing a central venous catheter used in central venous nutrition in a blood vessel. The Seldinger method is a method in which a catheter is introduced and placed in a blood vessel along a guide wire introduced and placed in the blood vessel. In general, the guide wire is housed in the guide wire supply device with the distal end projecting from the guide wire supply device, and enters the blood vessel through the puncture device such as a puncture needle or an indwelling needle connected to the guide wire supply device. be introduced.

  As a guide wire used in such a Seldinger method, a guide wire having the following configuration has been proposed. For example, in Patent Document 1, the shape of the distal end portion of the guide wire protruding from the guide wire supply tool is bent at a predetermined angle (for example, 45 degrees) from the wire axis direction in the state of being housed in the guide wire supply tool. A guide wire having a shape (angle shape) is described. Moreover, in patent document 2, 3, the shape of the front-end | tip part of the guide wire which protrudes from a guide wire supply tool in the state accommodated in the guide wire supply tool curves in J shape from a wire axial direction, and the front-end | tip Describes a guide wire having a shape (J shape) open to the outside. In addition, as described in Patent Document 4, a guide wire having a linear shape (straight shape) instead of a bent or curved shape is also used.

Utility Model Registration No. 2601155 (FIG. 3) (US Pat. No. 5,507,300) US Pat. No. 6,477,402 (FIG. 1) Japanese Patent No. 3527747 (FIG. 3) (US Pat. No. 5,827,202) Japanese Patent Laid-Open No. 10-99442 (FIG. 1)

  However, conventionally, puncture of blood vessels (for example, the internal jugular vein) in central venous nutrition has been performed blindly, and the success rate depends largely on the skill of the operator, and the vascular running differs depending on the patient. %is not. As a result, complications such as arterial puncture and pneumothorax often occur. Recently, in order to perform reliable puncture, puncture using an echo device has been performed. As a result, the puncture angle is larger than that of the conventional blind puncture. Specifically, the conventional puncture angle is 30 to 40 degrees and the puncture angle is 60 to 90 degrees.

  As shown in FIG. 8, in the conventional guide wire 50, the guide wire 50 introduced into the needle tube portion 202 (puncture needle) at the time of blood vessel puncture with a large puncture angle as described above is intended in the blood vessel. It may not be smoothly introduced in the direction of introduction and may excessively contact the inner wall of the blood vessel, resulting in blood vessel damage.

  In addition, the catheter for central vein is usually placed in the thickest blood vessel in the vicinity of the heart, such as the superior vena cava and the inferior vena cava, and not placed in the thin blood vessel. As shown in FIG. 9, in the conventional guide wire 50, the guide wire 50 may not be introduced from the introduction blood vessel BA into the thick blood vessel BB but may be introduced into the thin blood vessel BC at the blood vessel branching portion. This is because the shape of the distal end portion of the conventional guide wire 50 is easy to be introduced into the thin blood vessel BC from the introduction blood vessel BA, specifically, the angle shape or J shape where the distal end portion of the guide wire 50 is small. Or due to the straight shape.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a guide that does not cause puncture blood vessel damage even when the puncture angle is increased and does not introduce a thin blood vessel at a blood vessel branching portion. It is to provide a wire.

In order to solve the above problems, a guide wire according to the present invention is a guide wire that is housed in a guide wire supply tool and introduced into a blood vessel via a puncture needle connected to the guide wire supply tool. and Jo of the body portion, the provided continuously to the distal end side of the main body portion curved, a first curved portion a radius of curvature r1 is Ru der blade face length R following the puncture needle, and the body portion and the A second bending portion provided continuously in a curved shape between the first bending portion and a linear portion provided continuously in a straight line between the first bending portion and the second bending portion; In addition, the formation angle θ2 of the second bending portion is 180 to 270 degrees . Further, the guide wire is characterized in that it is curved outward so that the tip of the first bending portion approaches the main body portion or away from the main body portion. Further, the guide wire is characterized in that a radius of curvature r2 of the second bending portion is 2 to 5 mm.

According to the above configuration, the guide wire has the first curved portion with the radius of curvature r 1 smaller than the blade surface length of the puncture needle, has the second curved portion and the straight portion, and forms the second curved portion. Since the angle θ2 is within a predetermined range, the tip of the first bending portion is bent inward or outward, and the radius of curvature r2 of the second bending portion is within the predetermined range, the puncture angle is large. In the puncture blood vessel, the distal end of the guide wire is smoothly introduced in the intended introduction direction, excessive contact with the puncture blood vessel (inner wall of the blood vessel) is suppressed, and the size of the distal end of the guide wire is increased. In the bifurcation, introduction of the guide wire into a thin blood vessel is suppressed.

The guide wire according to the present invention is characterized in that a radius of curvature r1 of the first bending portion is 1.8 to 3 mm.
According to the above configuration, since the first curved portion has a predetermined range of curvature radius r1, the distal end portion of the guide wire is introduced more smoothly in the intended introduction direction, and contact with the puncture blood vessel (blood vessel inner wall) is further suppressed. Is done.

  The guide wire insertion system according to the present invention includes the guide wire, a puncture needle for introducing the guide wire into a blood vessel, a guide wire storage portion for storing the guide wire, and the guide wire connected to the puncture needle. And a guide wire supply device having a guide wire introducing portion for introducing the guide wire accommodated in the accommodating portion into the puncture needle.

  According to the above configuration, since the guide wire is provided, when the guide wire is introduced into the blood vessel through the puncture needle from the guide wire supply tool, the distal end portion of the guide wire is in the intended introduction direction even for a puncture blood vessel having a large puncture angle. It is smoothly introduced and excessive contact with the puncture blood vessel (inner blood vessel wall) is suppressed. In addition, in the blood vessel branching portion, the size of the distal end portion of the guide wire is increased, and introduction of the guide wire into a thin blood vessel is suppressed.

  According to the guide wire and the guide wire insertion system according to the present invention, the puncture blood vessel is not damaged even when the puncture angle is increased, and the introduction into the thin blood vessel at the blood vessel branching portion is eliminated.

It is a side view which shows the structure of the guide wire insertion system which concerns on this invention. It is a side view which shows the structure of the guide wire of 1st Embodiment which concerns on this invention. (A), (b) is a schematic diagram which shows the structure of the guide wire of 2nd Embodiment which concerns on this invention. (A), (b) is a schematic diagram which shows the structure of the guide wire of 3rd Embodiment which concerns on this invention. It is a schematic diagram which shows the introduction state in the puncture blood vessel of the guide wire which concerns on this invention. It is a schematic diagram which shows the operation | movement in the blood vessel branch part of the guide wire which concerns on this invention. It is a schematic diagram which shows the experiment which simulates introduction | transduction of the guide wire in a puncture blood vessel. It is a schematic diagram which shows the introduction state in the puncture blood vessel of the conventional guide wire. It is a schematic diagram which shows the operation | movement in the blood vessel branch part of the conventional guide wire.

An embodiment of a guide wire according to the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the guide wire 1 is a guide wire introduced into a blood vessel via a puncture needle (puncture device) 200 connected to the guide wire supply device 100.

  Here, it is preferable that the guide wire supply tool 100 includes a guide wire storage unit 101 and a guide wire introduction unit 102.

  The guide wire storage unit 101 is, for example, a flexible tube (tubular body) 101a wound in a spiral shape (curved), and stores most of the guide wire 1 in the length direction therein.

  The guide wire introduction unit 102 is connected to the puncture needle (puncture device) 200 and introduces the guide wire 1 stored in the guide wire storage unit 101 into the puncture needle (puncture device) 200. A connection unit 103 connected to the needle (puncture tool) 200 and a delivery unit 106 that is provided at a position separated from the connection unit 103 and sends out the guide wire 1 stored in the guide wire storage unit 101 are provided. Then, the guide wire 1 delivered from the delivery unit 106 is introduced into the puncture needle (puncture device) 200 via the connection unit 103.

  The guide wire introduction unit 102 is provided at a lower portion of the delivery unit 106 and a fixing unit 105 that detachably fixes the guide wire storage unit 101 via an arm unit 104 protruding from the connection unit 103. You may provide the fixing | fixed part 107 which fixes the part 101 detachably, and the connection part 108 which connects the fixing | fixed part 105 and the fixing | fixed part 107. FIG.

  The puncture device is for puncturing a predetermined part of a patient (human body) to secure a blood vessel into which the guide wire 1 is introduced, and a puncture needle or an indwelling needle is used. The puncture needle 200 includes a needle tube portion 202 and a hub 201 in which a lumen for fixing the needle tube portion 202 and connecting the guide wire supply tool 100 (guide wire introducing portion 102) is formed.

  As shown in FIG. 2, the guide wire 1 of the first embodiment has a main body portion 2 and a first bending portion 3. Each configuration will be described below.

(Main body)
The main body 2 is linear in the natural state and has flexibility. The main body 2 is a part that is accommodated in the guide wire supply tool 100 in the length direction of the guide wire 1. Specifically, as shown in FIG. 1, the main body 2 is housed in a tube (tubular body) 101 a constituting the guide wire housing 101 while being housed in the guide wire supply tool 100. And a portion sent out from the sending-out portion 106 constituting the guide wire introducing portion 102 to the connecting portion 103 and a portion housed inside the connecting portion 103. The tip portion 6 is configured by the tip portion 2 a and the first bending portion 3. As shown in FIG. 2, the distal end portion 6 has a two-layer structure of a core wire 1 a and a coil 1 b. Moreover, it is preferable that the length L of the front-end | tip part 2a is 3 mm or more. When the length L is less than 3 mm, the flexibility of the distal end portion 6 of the guide wire 1 is insufficient and the operability is lowered.

(First bending portion)
The first bending portion 3 is a portion that is provided in a curved shape continuously to the distal end side of the main body portion 2 in the length direction of the guide wire 1. Here, the distal end side of the main body portion 2 is not the side stored in the guide wire storage portion 101 but protrudes from the connection portion 103 of the guide wire introduction portion 102 and enters the blood vessel via the puncture needle (puncture device) 200. The side to be introduced is referred to (see FIG. 1).

  The first bending portion 3 has a radius of curvature r <b> 1 that is equal to or less than the blade surface length R of the puncture needle 200. Here, the blade surface length R is typically 1.8 to 3 mm because a puncture needle 200 having an outer diameter of 18 to 22G is used. By having the first bending portion 3 having such a predetermined radius of curvature r1, as shown in FIG. 5, the blood vessel (for example, the internal jugular vein) is punctured at a large puncture angle (for example, 60 to 90 degrees). Even if the guide wire 1 is introduced into the needle tube portion 202 (puncture needle 200), the guide wire 1 is smoothly introduced in the intended introduction direction, and contact with the inner wall of the blood vessel can be reduced, resulting in blood vessel damage. This can be suppressed. Further, by having the first bending portion 3 having a predetermined radius of curvature r1, the distal end portion 6 of the guide wire 1 has a predetermined size, and as shown in FIG. The wire 1 is not introduced from the introduction blood vessel BA into the thin blood vessel BC, but is introduced into the thick blood vessel BB (for example, the superior vena cava side).

  When the radius of curvature r1 of the first curved portion 3 exceeds the blade surface length R, the size of the distal end portion 6 of the guide wire 1 becomes too large, and the guide wire 1 is intended to be introduced in a puncture vessel having a large puncture angle. In this case, the blood vessel is excessively brought into contact with the blood vessel wall, causing blood vessel damage (see FIG. 8) and hindering smooth movement of the guide wire 1 in the blood vessel.

  The first bending portion 3 preferably has a formation angle θ1 of 50 to 100 degrees. When represented by the length LA, it is about 1 to 5 mm. When the formation angle θ1 is less than 50 degrees, the size of the distal end portion 6 of the guide wire 1 is small, so that the guide wire 1 is easily introduced into a thin blood vessel at the blood vessel branching portion. If the formation angle θ1 exceeds 100 degrees, the first bending portion 3 is likely to be entangled with the main body portion 2 (the distal end portion 2a), and smooth movement of the guide wire 1 in the blood vessel is likely to be hindered.

  As shown in FIGS. 3A and 3B, the guide wires 10 a and 10 b of the second embodiment further include a second bending portion 4 in addition to the main body portion 2 and the first bending portion 3. That is, the 2nd bending part 4 is provided between the main-body part 2 and the 1st bending part 3 of the guide wire 1 of 1st Embodiment. The distal end portion 6 includes the distal end portion 2 a of the main body portion 2, the second bending portion 4, and the first bending portion 3.

(Second bending portion)
The second bending portion 4 is a portion that is continuously provided in a curved shape between the main body portion 2 (tip portion 2a) and the first bending portion 3 in the length direction of the guide wires 10a and 10b. When the guide wire 1 has the second bending portion 4, in the puncture blood vessel having a large puncture angle, the guide wires 10a and 10b can be further introduced, and excessive contact with the puncture blood vessel (inner wall of the blood vessel) is further suppressed. In addition, the size of the distal end portion 6 of the guide wires 10a and 10b is further increased, and the guide wires 10a and 10b are further prevented from being introduced into thin blood vessels at the blood vessel branching portion. Moreover, it is preferable that the curvature radius r2 of the 2nd bending part 4 is 2-5 mm substantially equal to 1/2 of the blood-vessel internal diameter which indwells the guide wire 1. FIG. This further suppresses the introduction of the guide wires 10a and 10b into the thin blood vessel at the blood vessel branching portion.

  The second bending portion 4 has a formation angle θ2 of preferably 50 to 270 degrees, and more preferably 180 to 270 degrees. When the formation angle θ2 is less than 50 degrees or more than 270 degrees, the first bending portion 3 is likely to be entangled with the main body portion 2 (tip portion 2a), and smooth movement of the guide wire 1 in the blood vessel is likely to be hindered.

  As shown in FIGS. 4A and 4B, the guide wires 11 a and 11 b of the third embodiment further include the linear portion 5 in addition to the main body portion 2, the first bending portion 3 and the second bending portion 4. Have. That is, the straight part 5 is provided between the first bending part 3 and the second bending part 4 of the guide wires 10a and 10b of the second embodiment. The distal end portion 6 includes a distal end portion 2 a of the main body portion 2, a second bending portion 4, a straight portion 5, and a first bending portion 3.

(Linear part)
The straight portion 5 is a portion that is continuously provided in a straight line between the first bending portion 3 and the second bending portion 4 in the length direction of the guide wires 11a and 11b. Since the guide wires 11a and 11b have the straight portions 5, the introduction of the guide wires 11a and 11b is further improved in a puncture blood vessel having a large puncture angle. And it is preferable that the length LB of the linear part 5 is 20 mm or less. When the length LB exceeds 20 mm, the first bending portion 3 is likely to be entangled with the main body portion 2 (tip portion 2a), and smooth movement of the guide wires 11a and 11b in the blood vessel is likely to be hindered.

  The guide wires 10a, 10b, 11a, 11b of the second embodiment and the third embodiment have the first bending portion 3 as shown in FIGS. 3 (a), 3 (b), 4 (a), 4 (b). And the second bending portion 4. And in guide wire 10a, 11a, the front-end | tip 3a of the 1st bending part 3 takes the form curved inside so that it may approach the main-body part 2 (front-end | tip part 2a) (FIG. 3 (a), FIG. 4 (a)). reference). Moreover, in the guide wires 10b and 11b, the front-end | tip 3a of the 1st bending part 3 takes the form curved outward so that it may distance from the main-body part 2 (front-end | tip part 2a) (FIG.3 (b), FIG.4 (b)). reference). Any of the above forms may be used, but a form in which the tip 3a of the first bending portion 3 is curved inward (see the guide wires 10a and 11b, FIGS. 3A and 4A) is preferable. In this way, by bending the distal end 3a of the first bending portion 3 inward, the introduction property of the guide wire 1 in the puncture blood vessel having a large puncture angle can be further improved.

  The structure of the guide wires 1, 10 a, 10 b, 11 a, 11 b is not particularly limited, but as shown in FIG. 2, the main body 2 (excluding the tip portion 2 a) is made of metal (for example, Ni—Ti alloy) Single-layer structure consisting only of the core wire 1a made of the product, the tip portion 6 (the tip portion 2a and the first bending portion 3, or in addition to this, the second bending portion 4 and the straight portion 5 (FIG. 4 (a), ( The reference wire b)) is preferably a two-layer guide wire comprising a core wire 1a and a metal (for example, stainless steel) coil 1b provided on the outer periphery of the core wire 1a. And the junction parts 1c and 1d by which the core wire 1a and the coil 1b were joined by welding are provided in the both ends of the front-end | tip part 6. As shown in FIG. The guide wires 1, 10 a, 10 b, 11 a, 11 b may have a two-layer structure of the core wire 1 a and the coil 1 b as a whole in the length direction, or the whole length direction may be the core wire 1 a. It may be a guide wire having a single-layer structure made of only.

  The guide wires 1, 10a, 10b, 11a, and 11b may constitute the core wire 1a and the coil 1b with synthetic resin instead of metal. As the synthetic resin, elastomers such as polyolefin, polyester, polyamide, polyurethane, silicone rubber, polyvinyl chloride, fluororesin, latex rubber, and composite materials thereof can be used.

Next, a guide wire insertion system 300 according to the present invention will be described with reference to FIG. As shown in FIG. 1, a guide wire insertion system 300 includes a guide wire 1, a puncture needle (puncture tool) 200 for introducing the guide wire 1 into a blood vessel, a guide wire storage unit 101 for storing the guide wire 1, A guide wire supply device 100 having a guide wire introducing unit 102 which is connected to a puncture needle (puncture device) 200 and introduces the guide wire 1 stored in the guide wire storage unit 101 into the puncture needle (puncture device) 200; It is characterized by providing.
Note that the guide wire 1, the puncture needle 200, and the guide wire supply tool 100 (the guide wire storage unit 101 and the guide wire introducing unit 102) are as described above, and thus description thereof is omitted.

  Next, an example of how to use the guide wire 1 and the guide wire insertion system 300 according to the first embodiment will be described with reference to FIG.

  First, a puncture needle (puncture device) 200 is punctured while confirming an echo image at a predetermined site (for example, internal jugular vein) of a patient (human body), and the needle tube portion 202 of the puncture needle 200 is inserted into a blood vessel ( (See FIG. 5). Then, blood is sucked with a syringe or the like, and it is confirmed that the needle tube portion 202 is located in the blood vessel.

  Next, a part of the main body 2 of the guide wire 1 stored in the guide wire storage 101 is gripped with fingers or the like, and the tip 6 (the tip 2a and part of the first bending part 3 are connected to the connection 103 (guide The connecting portion 103 is inserted into the hub 201 of the puncture needle (puncture tool) 200. The main body portion 2 of the guide wire 1 is grasped with fingers or the like, and the guide wire is inserted. 1 is introduced into a blood vessel via a puncture needle (puncture tool) 200.

Next, with the guide wire 1 left in the blood vessel, the puncture needle (puncture device) 200 is removed, the guide wire 1 is removed from the guide wire introducing portion 102 (connecting portion 103), and the guide wire 1 is placed in the blood vessel. Detained. Then, a central venous catheter is inserted into the blood vessel along the guide wire 1 using a dilator (not shown). Next, the guide wire 1 is removed while leaving the central venous catheter, and the central venous catheter is placed in the blood vessel.
Since the guide wires 10a and 10b of the second embodiment and the guide wires 11a and 11b of the third embodiment also have the first bending portion 3, they are introduced into the blood vessel in the same manner as the guide wire 1 of the first embodiment. can do.

Next, examples of the guide wire according to the present invention will be described.
( Reference Example 1 )
Ni-Ti steel core wire (outer diameter: 0.38 mm, Length: 600 mm) the tip of the after tapered over pressurization Engineering, periphery in a stainless steel coil (outer diameter of the distal end portion: 0.38 mm, Length: 35mm A guide wire shown in FIG. And the shape of the front-end | tip part of the guide wire was made into the length of a front-end | tip part: 40 mm, and the curvature radius of the 1st curved part: 2 mm (length: 2 mm).

( Reference Example 2 )
A guide wire similar to that of Reference Example 1 was prepared except that the shape of the tip of the guide wire was changed to the shape shown in FIG. And the shape of the front-end | tip part of the guide wire is the length of a front-end | tip part: 40 mm, the curvature radius of a 2nd curve: 5 mm (formation angle: 180 degree | times), the curvature radius of a 1st curve part: 2 mm (length: 2 mm) , Curved inward).

( Reference Example 3 )
A guide wire similar to that of Reference Example 2 was produced except that the shape of the distal end portion of the guide wire was curved outward as shown in FIG. 3B.

Example 4
A guide wire similar to that of Reference Example 1 was produced except that the shape of the tip portion of the guide wire was changed to the shape shown in FIG. The shape of the distal end portion of the guide wire is as follows: the length of the distal end portion: 40 mm, the radius of curvature of the second curve: 5 mm (formation angle: 180 degrees), the length of the straight portion: 4 mm, the radius of curvature of the first curved portion : 2 mm (length: 2 mm, curved inward).

(Example 5)
A guide wire similar to that of Example 4 was produced except that the shape of the distal end portion of the guide wire was curved outward as shown in FIG. 4B.

(Comparative Example 1)
A guide wire was prepared by welding a stainless steel coil (outer diameter: 0.8 mm, length: 600 mm) to the outer periphery of a stainless core wire (outer diameter: 0.28 mm, length: 600 mm). And the shape of the front-end | tip part of the guide wire was made into the straight shape (The shape described in patent document 4, and there is no 1st bending part).

(Comparative Example 2)
After processing 22 mm from the tip of a stainless steel core wire (outer diameter: 0.28 mm, length: 600 mm) into a flat plate shape, a stainless steel coil (outer diameter: 0.8 mm, length: 600 mm) is formed on the outer periphery over the entire length. ) Was welded to produce a guide wire. And the shape of the front-end | tip part of the guide wire was made into the angle shape (bending angle: 45 degree | times) described in patent document 1. FIG. In addition, this angle shape is made into the curvature radius of the 1st curved part in the front-end | tip part of a guide wire shown in FIG. 2: 5 mm (length: 8 mm).

Using the guide wires of Reference Examples 1 to 3 and Examples 4 to 5 and Comparative Examples 1 and 2, introduction properties at the puncture blood vessel and the blood vessel branching portion were evaluated by the following procedure. The results are shown in Table 1.

(Introduction with puncture vessel)
The following experiment was conducted by simulating the introduction of a guide wire into the puncture blood vessel. As shown in FIG. 7, the puncture needle (inner diameter: 0.58 mm, blade surface length: 2 mm) is placed on the silicone rubber so that the puncture needle and the silicone rubber form an angle of 90 degrees (introduction angle). The puncture needle was held. The guide wire was introduced into the held puncture needle, and the guide wire introduction property was evaluated. And, the evaluation criteria for the introductory property is that when the distal end portion of the guide wire protrudes from the distal end of the puncture needle in the introducing direction, it is determined that the permeability is good and there is no fear of blood vessel damage, and “◎: Excellent” did. In addition, when the distal end portion of the guide wire hardly protrudes from the distal end of the puncture needle in the introduction direction, it was determined that the permeability was poor and there was a risk of blood vessel damage, and “x: defective” was determined.

(Introduction at the blood vessel bifurcation)
As shown in FIG. 6 and FIG. 9, a pseudo blood vessel model that branches from an introduction blood vessel BA (inner diameter dA: 7 mm) into a thick blood vessel BB (inner diameter dB: 8 mm) and a thin blood vessel BC (inner diameter dC: 3 mm) is prepared. Guide wires (number: 5 each) were introduced from the introduction blood vessel BA toward the thick blood vessel BB, and the introduction property was evaluated.

  The evaluation criteria for introduction are “◎: excellent” when all guide wires are introduced from the introduction blood vessel BA into the thick blood vessel BB, and a thin blood vessel BC is introduced from the introduction blood vessel BA with two or less guide wires. In some cases, “◯: good”, and when all the guide wires were introduced from the introduction blood vessel BA into the thin blood vessel BC, “x: bad”.

From the results in Table 1, since the guide wire of Reference Example 1 had the first curved portion, the introduction property in the puncture blood vessel was excellent and the introduction property in the blood vessel branching portion was good. Since the guide wires of Reference Examples 2 to 3 or Examples 4 to 5 have the first bending portion and the second bending portion, or the first bending portion, the straight portion, and the second bending portion, the puncture blood vessel and the blood vessel branching portion In any of the cases, the introduction property was excellent.

  Since the guide wire of Comparative Example 1 did not have the first bending portion, the introduction property was poor in both the puncture blood vessel and the blood vessel branching portion.

The guide wire of Comparative Example 2 has the first curved portion (bent portion) as in Reference Example 1 , but its curvature radius is larger than the blade surface length of the puncture needle, so the introduction property at the blood vessel branching portion is good. However, the introduction into the puncture vessel was poor.

DESCRIPTION OF SYMBOLS 1 Guide wire 1a Core wire 1b Coil 1c, 1d Joining part 2 Main-body part 2a Tip part 3 1st bending part 4 2nd bending part 5 Straight line part 100 Guide wire supply tool 101 Guide wire accommodating part 102 Guide wire introducing | transducing part 200 Puncture needle (Puncture tool)
300 Guide wire insertion system

Claims (6)

A guide wire housed in a guide wire supply tool and introduced into a blood vessel through a puncture needle connected to the guide wire supply tool,
A linear body,
Provided in a curved shape continuously in the distal end side of the main body portion, a first curved portion a radius of curvature r1 is Ru der less blade surface length R of the puncture needle,
A second bending portion provided in a curved shape continuously between the main body portion and the first bending portion;
A linear portion provided in a straight line continuously between the first curved portion and the second curved portion;
A formation angle θ2 of the second bending portion is 180 to 270 degrees .   The guide wire according to claim 1, wherein a radius of curvature r1 of the first curved portion is 1.8 to 3 mm. The guide wire according to claim 1, wherein the first bending portion is bent inward so that a tip thereof approaches the main body portion. 3. The guide wire according to claim 1, wherein the first bending portion is bent outward so that a tip of the first bending portion moves away from the main body portion. 4. The guide wire according to any one of claims 1 to 4, wherein a radius of curvature r2 of the second bending portion is 2 to 5 mm. A guide wire according to any one of claims 1 to 5 ,
A puncture needle for introducing the guide wire into the blood vessel;
A guide wire supply having a guide wire storage portion for storing the guide wire, and a guide wire introduction portion for connecting the guide wire stored in the guide wire storage portion to the inside of the puncture needle by connecting to the puncture needle A guide wire insertion system comprising: a tool.

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