JP2012000239A - Medical puncture needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical puncture needle, which can secure good puncture performance and bend the progress direction of an insertion body with respect to the central axis line of a needle body so as not to harm a vascular wall etc., by the tip end of the insertion body.SOLUTION: The medical puncture needle 10 has: a needle body 30 with a straight pipe shape with a lumen 31 formed, into which a flexible insertion body 20 is freely inserted; and a blade surface 33 including a tip opening 32 tilted to the central axis line C of the needle body. The medical puncture needle further has a guide member 40 provided on the lumen inner surface on a cutting edge side in the lumen inner surface continued to the blade surface. The guide member guides the insertion body so as to insert the insertion body into the tip opening while the insertion body is bent onto the side of a blade surface heel part 34 side than the central axis line of the needle body.

Description

  The present invention relates to a medical puncture needle.

  2. Description of the Related Art In recent years, various forms of treatments and examinations have been performed in medicine using an elongated hollow tubular medical device called a catheter. A guide wire is used when introducing a catheter into an artery or vein. This guide wire is introduced into the blood vessel using a medical puncture needle. When inserting a flexible insert such as a guide wire into a blood vessel, it is necessary to prevent the blood vessel wall from being damaged by the distal end of the insert.

  In Patent Document 1, the traveling direction of the insertion body is bent with respect to the central axis of the needle body by forming the tip of the needle body in a curved shape or by forming an opening in the peripheral wall of the needle body. A medical puncture needle is described.

JP 2008-194112 (see FIGS. 5 and 7)

  However, in a medical puncture needle in which the tip of the needle body is formed in a curved shape, there is a problem that resistance when puncturing the needle body into a blood vessel or the like is large and puncture properties are poor. Further, in a medical puncture needle having an opening in the peripheral wall of the needle body, the puncture property can be secured, but the opening tends to face the blood vessel wall, and there is a possibility that the blood vessel wall is damaged by the distal end of the insert.

  The object of the present invention is to solve the problems associated with the above-described conventional technology, and ensures an excellent puncture property and prevents the blood vessel wall from being damaged by the distal end of the insert. It is an object of the present invention to provide a medical puncture needle that can bend the traveling direction of the needle with respect to the central axis of the needle body.

  In order to achieve the above object, a medical puncture needle of the present invention includes a needle body having a straight tube shape in which a lumen through which a flexible insertion body can be inserted is formed, and a central axis of the needle body. A blade surface having a tip opening that is inclined and a lumen inner surface on the blade tip side of a lumen inner surface continuous with the blade surface, and the insert is closer to the blade heel portion than the central axis of the needle body And a guide member that guides the distal end opening while being bent.

  According to the present invention, when the insertion body is fed and advanced toward the distal end side of the needle body, the insertion body is bent along the guide member toward the blade surface heel portion with respect to the center axis of the needle body. Guided through the tip opening. As a result, the traveling direction of the insertion body is bent with respect to the central axis of the needle body, and the insertion body can be inserted into a blood vessel or the like without damaging the blood vessel wall, for example.

  Moreover, since the distal end opening is provided at the distal end of the needle body, it is difficult to face the blood vessel wall or the like as compared with the case where the opening is formed in the peripheral wall of the needle body. Therefore, even if the insert is inserted while being bent, the blood vessel wall or the like is not damaged by the tip of the insert.

  Furthermore, since the blade surface is formed at the tip of the straight tube-shaped needle body, resistance when the needle body is punctured into a blood vessel or the like is small, and good puncture properties can be ensured.

  Therefore, according to the medical puncture needle of the present invention, the advancement direction of the insertion body is set to the central axis of the needle body so as to ensure good puncture properties and not damage the blood vessel wall or the like by the distal end of the insertion body. It becomes possible to bend with respect to it.

1A and 1B are a front view and a plan view showing a medical puncture needle according to an embodiment, and FIG. 1C is an enlarged view showing a distal end portion of a needle body. It is sectional drawing which shows typically the front-end | tip part of a needle | hook main body. 3A and 3B are cross-sectional views for explaining the operation of the medical puncture needle.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. In addition, the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may be different from the actual ratios.

  The medical puncture needle shown is a device for use when a guide wire used when introducing a catheter is introduced into a blood vessel. In recent years, in the technique of introducing a catheter or the like into an artery, the technique of the transradial artery approach (TRI), which is considered to be less burdensome on the patient after the operation than the transfemoral artery approach (TFI), is increasing. Since the radial artery has a smaller blood vessel diameter than the femoral artery, medical puncture needles, guide wires, catheters and the like having a smaller outer diameter are used in the TRI system. The radius of the radial artery is about 2 to 3 mm. In the following description, the hand operation side of the device is referred to as “proximal end side”, and the side inserted into the body cavity is referred to as “distal end side”. The medical puncture needle is also simply referred to as “puncture needle”.

  With reference to FIGS. 1 to 3, the puncture needle 10 of this embodiment is generally formed with a lumen 31 through which a flexible guide wire 20 (corresponding to the insert 20) can be inserted. The needle body 30 has a straight pipe shape, and the blade surface 33 includes a tip opening 32 that is inclined with respect to the central axis C of the needle body 30. The puncture needle 10 further has a guide member 40 provided on the inner surface of the lumen 31 on the blade tip side of the inner surface of the lumen 31 continuous with the blade surface 33. The guide member 40 guides the guide wire 20 so as to pass through the distal end opening 32 while being bent toward the blade surface heel portion 34 with respect to the central axis C of the needle body 30. Hereinafter, the puncture needle 10 will be described in detail.

  The needle body 30 is formed of a hollow metal pipe having a straight pipe shape. The forming material of the needle body 30 is not particularly limited, but stainless steel is suitable. The outer diameter of the needle body 30 is generally about 0.9 to 2.0 mm.

  A hub 50 in which a through hole 51 communicating with the inner cavity 31 is formed is attached to the proximal end portion of the needle body 30 (see FIGS. 1A and 1B). The guide wire 20 is inserted from the rear end opening 52 of the hub 50 and is inserted into the lumen 31 of the needle body 30. The hub 50 is formed from a hard resin. The operator holds the hub 50 and punctures the blood vessel 100 or the like with the tip of the puncture needle 10.

  The hub 50 is provided with a marker 53 for showing the side to which the blade surface 33 faces. The mode of the marker 53 is not limited, and the marker 53 may be affixed with an adhesive or a tape, or may be applied with a paint. Even after the puncture needle 10 has been punctured, the side on which the blade surface 33 faces can be easily confirmed at the hub 50 by visually recognizing the marker 53.

  A piercing blade surface 33 is formed at the tip of the needle body 30. Since the blade surface 33 is formed at the tip of the straight tube-shaped needle main body 30, resistance when the needle main body 30 is punctured into the blood vessel 100 or the like is small, and good puncture properties can be ensured. The tip opening 32 is formed obliquely with respect to the central axis C of the needle body 30. Thereby, the front-end | tip opening 32 becomes what opened over predetermined length along the longitudinal direction of the needle | hook main body 30 (refer FIG.1 (C)). The longitudinal dimension of the distal end opening 32 is sufficiently longer than the diameter dimension of the lumen 31. For example, the length along the inclination direction of the blade surface 33 is about 2.5 mm. The blade shape of the puncture needle 10 shown in the figure is a shape called a lancet point, but the blade shape is not limited to this type, and a blade shape of an appropriate shape such as a backcut point can be adopted.

  With reference to FIG. 1C and FIG. 2, the guide member 40 is provided on the inner surface of the inner cavity 31 on the blade tip side among the inner surfaces of the inner lumen 31 continuous with the blade surface 33. The surface of the guide member 40 is a guide surface 41 that guides the guide wire 20 so as to be inserted through the tip opening 32 while being bent toward the blade surface heel portion 34 with respect to the central axis C of the needle body 30. The guide surface 41 can be formed as an arc surface or a flat inclined surface as long as the progression of the guide wire 20 can be guided as described above. The angle θ at which the guide wire 20 is bent is preferably greater than 0 degree and 90 degrees or less with respect to the central axis C of the needle body 30.

  The guide member 40 is preferably present on the inner cavity 31 side of the surface including the blade surface 33, that is, has a shape that does not exist on the distal end side beyond the blade surface 33. This is because resistance when the needle body 30 is punctured into the blood vessel 100 or the like can be prevented from being increased by the guide member 40, and good puncture performance can be maintained.

  The material for forming the guide member 40 is not particularly limited, and an appropriate material such as a resin material or a metal material can be applied. An example of the resin material is polycarbonate resin, and an example of the metal material is stainless steel.

  The guide member 40 is attached to the inner surface of the lumen 31 by adhesion or bonding. The guide member 40 can be easily applied to the inner surface of the lumen 31 by applying a known method such as bonding (adhesive, UV bonding, etc.) or bonding (welding, ultrasonic bonding, etc.) according to the forming material of the guide member 40. Can be attached to. As described above, the longitudinal dimension of the distal end opening 32 is sufficiently longer than the diameter dimension of the lumen 31. Also from this point, the guide member 40 can be easily attached to the inner surface of the lumen 31. It is preferable that the thickness of the wall of the needle body 30, that is, the thickness of the metal tube constituting the needle body 30 is thin. If the needle body 30 has the same outer diameter, the thinner one can make the opening area of the tip opening 32 larger, the space for installing the guide member 40 can be made larger, and the attachment work is also easier to perform. Because.

  The method for producing the guide member 40 is not particularly limited, and a known method can be applied. For example, it can be produced by cutting a resin material or a metal material. In addition, a method using a mold such as injection molding can be applied to the guide member 40 made of a resin material, and a method such as casting or press molding can be applied to a metal material.

  Referring to FIG. 2, the peripheral edge portion of tip opening 32 (particularly, in the vicinity of blade surface heel portion 34) has a rounded edge (has a rounded shape). When the guide wire 20 is slid or rotated in the lumen 31 to introduce the guide wire 20 toward the target site, the guide wire 20 and the peripheral edge portion of the tip opening 32 are rubbed and damaged. This is because the occurrence of problems such as these can be suppressed.

  The operation of the embodiment will be described.

  The operator holds the hub 50 and punctures the blood vessel 100 or the like with the tip of the puncture needle 10. Even after the puncture needle 10 has been punctured, the side on which the blade surface 33 faces can be easily confirmed at the hub 50 by visually recognizing the marker 53. With reference to FIG. 3A, the guide wire 20 is inserted from the rear end opening 52 of the hub 50 and is inserted into the lumen 31 of the needle body 30. An arrow 101 in FIG. 3 indicates the direction of blood flow.

  Referring to FIG. 3B, when the guide wire 20 is fed out toward the distal end side of the needle body 30 and advanced, the guide wire 20 is moved along the guide surface 41 of the guide member 40 and the center of the needle body 30. Guided so as to be inserted through the tip opening 32 while being bent toward the blade surface heel portion 34 with respect to the axis C. As a result, the traveling direction of the guide wire 20 is bent with respect to the central axis C of the needle body 30, and the guide wire 20 can be inserted into the blood vessel 100 without damaging the blood vessel wall.

  Moreover, an opening is not formed in the peripheral wall of the needle body 30, but a tip opening 32 is provided at the tip of the needle body 30. For this reason, the distal end opening 32 opens toward the downstream direction of the blood flow, and is less likely to face the blood vessel wall than when the opening is formed in the peripheral wall of the needle body. Therefore, even if the guide wire 20 is inserted while being bent, the blood vessel wall is not damaged by the tip of the guide wire 20.

  Further, as described above, since the blade surface 33 is formed at the tip of the straight tube-shaped needle main body 30, resistance when the needle main body 30 is punctured into the blood vessel 100 or the like is small, and good puncture properties are ensured. be able to.

  Therefore, according to the puncture needle 10 of the present embodiment, the guide wire 20 is moved in the direction of the needle body 30 so as to ensure good puncture properties and not damage the blood vessel wall or the like by the tip of the guide wire 20. It can be bent with respect to the central axis C.

  After the guide wire 20 is introduced into the blood vessel 100 by a certain length, only the puncture needle 10 is removed, and then the proximal end side of the guide wire 20 placed in the blood vessel 100 is inserted. Thus, catheters for angiography and vasodilation are introduced into the blood vessel 100.

  As described above, the medical puncture needle of the present invention has been described based on the illustrated embodiment, but the present invention is not limited to this, and each part constituting the medical puncture needle exhibits the same function. It can be replaced with any configuration obtained. Arbitrary components may be added.

  For example, the peripheral edge of the tip opening 32 (particularly, near the blade heel 34) may be covered with a resin material from the inside. This is because when the insert 20 is slid or rotated in the lumen 31, it is possible to suppress the occurrence of problems such as the insert 20 and the peripheral edge of the tip opening 32 being rubbed and damaged.

10 Medical puncture needle,
20 Guide wire (insert),
30 needle body,
31 lumens,
32 Tip opening,
33 blade surface,
34 Blade heel,
40 guide members,
41 Guide surface,
50 hubs,
51 through holes,
52 rear end opening,
53 markers,
100 blood vessels,
C Center axis.

Claims (3)

A needle body having a straight tube shape in which a lumen through which a flexible insert can be inserted is formed;
A blade surface having a tip opening inclined with respect to the central axis of the needle body;
It is provided on the inner surface of the inner cavity on the cutting edge side of the inner surface of the inner cavity that is continuous with the blade surface, and the insertion body is inserted through the tip opening while being bent toward the blade surface heel portion with respect to the central axis of the needle body. A medical puncture needle comprising: a guide member for guiding the needle.   The medical puncture needle according to claim 1, wherein the guide member is present on a lumen side with respect to a surface including the blade surface.   The medical puncture needle according to claim 1 or 2, wherein the guide member is attached to the inner surface of the lumen by adhesion or bonding.

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