JPWO2017017934A1 - Medical puncture needle - Google Patents

Abstract

The medical puncture needle (1) according to the present invention is continuous with a main body (2) having an outer shape having a substantially circular cross section perpendicular to the central axis direction (A), and one end of the main body (2). A distal end portion (3) having an outer shape with a flat cross section perpendicular to the central axis direction (A), and the distal end portion (3) has one end of the needle tip (8) by a ridge line intersecting each other. The first blade surface portion (5) and the second blade surface portion (6) that form the blade edge (9), and when the needle tip (8) is viewed in the central axis direction (A), It is located inside the outer periphery of the main body (2).

Description

  The present invention relates to a medical puncture needle.

  Conventionally, as a medical puncture needle, such as a blood collection needle or an infusion needle for infusion, a plurality of blade surfaces having different angles with respect to the longitudinal direction of the puncture needle in order to reduce pain when the puncture needle is punctured into a human body There is known one having a tip portion having the following.

  Patent Document 1 discloses an injection needle as such a puncture needle. The injection needle of Patent Document 1 is an injection needle in which a pointed portion of a cylindrical main body is cut obliquely from either one to form a tapered pointed portion, connected from the outer periphery of the cylindrical main body, and the main body A first inclined surface formed at a predetermined angle with respect to the axial direction (longitudinal direction) of the first and second surfaces, and an angle connected to the first inclined surface and greater than the first inclined surface with respect to the axial direction of the main body And a third inclined surface formed by connecting to the second inclined surface and connecting to the cutting edge and having an angle with respect to the axial direction of the main body larger than that of the second inclined surface. And an inclined surface.

  Patent Document 2 also discloses a hypodermic needle as a puncture needle. The hypodermic needle of Patent Document 2 has a tip with a multi-bevel surface, and the tip of the multi-bevel surface has a main bevel surface, a pair of intermediate bevel surfaces, and a pair of tip bevel angles. And a surface.

JP 2000-262615 A Japanese Patent Laid-Open No. 10-57490

  Like the injection needles of Patent Document 1 and Patent Document 2, by using a tip having a blade surface connecting a plurality of surfaces with different angles with respect to the longitudinal direction, a ridge line (junction) formed at the boundary between the surfaces The puncture resistance can be reduced, and pain when the needle is punctured into the human body can be reduced.

  However, when a puncture needle having a shape as described in Patent Document 1 or Patent Document 2 is used to puncture a target site at a relatively deep position in the body, the blade surface side of the puncture needle is pressed by the body tissue. In addition, the traveling direction is shifted to the side opposite to the blade surface side of the puncture needle, and there is a problem of rectilinearity that it is difficult to puncture the target site in the body.

  In view of the above problems, an object of the present invention is to provide a medical puncture needle having a shape that can improve straightness.

  The medical puncture needle according to the first aspect of the present invention includes a main body portion having a substantially circular outer shape in a cross section orthogonal to the central axis direction, continuous to one end of the main body portion, and orthogonal to the central axis direction. A tip portion having a flat outer shape, and the tip portion includes a first blade surface portion and a second blade surface portion that form a blade edge having a needle tip as one end by a ridgeline intersecting each other, The needle tip is located inside the outer periphery of the main body when viewed in the central axis direction.

  As one embodiment of the present invention, the longitudinal direction of the tip portion in the cross section orthogonal to the central axis direction is the long axis direction of the tip portion, and the short direction of the tip portion in the cross section orthogonal to the central axis direction , When the tip is viewed in the direction of the central axis, both ends in the major axis of the tip are located outside the outer periphery of the main body, It is preferable that both ends in the minor axis direction of the distal end portion are located inside the outer periphery of the main body portion.

  As one embodiment of the present invention, in the side view of the tip portion facing the major axis direction, the tip portion located on the opposite side of the front blade surface including the first blade surface portion and the second blade surface portion. It is preferable that a rear inclined portion that is inclined so as to approach the central axis as it goes toward the needle tip in the direction of the central axis is formed on the outer peripheral surface of the distal end portion.

  The medical puncture needle according to one embodiment of the present invention includes a back blade surface including the first blade surface portion and the second blade surface portion in a side view when the distal end portion is viewed facing the long axis direction. The front blade surface is inclined to the opposite side of the central axis direction and extends from the back blade surface to the main body part side in the central axis direction. On the other hand, the outer peripheral surface of the distal end portion, which is on the main body portion side in the central axis direction and located on the opposite side to the front blade surface, moves toward the central axis line toward the needle tip in the central axis direction. It is preferable that a back inclined portion that is inclined so as to approach is formed.

  As one embodiment of the present invention, the front blade surface is from the needle tip to the boundary between the tip portion and the main body portion, or from the needle tip to the boundary between the tip portion and the main body portion. It is preferable to extend to the main body part.

  As one embodiment of the present invention, the front blade surface extends only within the tip portion, and one end of the front blade surface on the main body side in the central axis direction is an outer peripheral surface of the tip portion. Among these, it is preferable that it is continuous with the front inclined portion that is inclined so as to approach the central axis as it approaches the needle tip in the central axis direction in the side view.

  As one embodiment of the present invention, it is preferable that the back inclined portion extends to a position facing the front inclined portion in the side view.

  As one embodiment of the present invention, the tip portion has an elliptical cylindrical blade surface forming portion on which a blade surface including the first blade surface portion and the second blade surface portion is formed, and the blade surface forming portion. A cylindrical connecting part that connects the main body part, and the outer peripheral surface of the connecting part is respectively in a position opposed to each other in a side view when the tip part is seen facing the major axis direction. It is preferable that a front inclined portion and a back inclined portion that are inclined so as to approach the central axis as they go toward the needle tip in the central axis direction are formed.

  As one embodiment of the present invention, the outer peripheral surface of the tip portion gradually increases in width toward the needle tip in the central axis direction in a front view when the tip portion is viewed facing the short axis direction. It is preferable to have a taper part.

  As one embodiment of the present invention, an outer edge of at least one of the first blade surface portion and the second blade surface portion is formed from an outer periphery of the main body portion when the tip portion is viewed in the central axis direction. It is also preferable that it extends to the outside.

  As one embodiment of the present invention, the outer edge of the at least one blade surface portion has a maximum width of the tip in the major axis direction from the needle tip when the tip is viewed in the central axis direction. It is preferable that the position has been reached.

  As one embodiment of the present invention, it is preferable that the center axis of the tip end portion substantially coincides with the center axis of the main body portion.

  According to the present invention, it is possible to provide a puncture needle having a shape that can improve straightness.

1 (a), (b), (c), and (d) are a plan view, a side view, a back view, and a perspective view, respectively, of a puncture needle as an embodiment of the present invention. . 2 (a) and 2 (b) are enlarged views of the vicinity of the distal end portion of the puncture needle shown in FIGS. 1 (a) and 1 (b), respectively. It is the figure which looked at the puncture needle shown in FIG. 1 from the needle point side of a center axis direction. FIGS. 4A, 4B, 4C, and 4D are a cross-sectional view taken along line II, II-II, III-III, and IV-IV in FIG. 2A, respectively. 5A, 5B, 5C, and 5D are a plan view, a side view, a plan view of the back side, and a perspective view of a puncture needle as an embodiment of the present invention, respectively. . 6 (a) and 6 (b) are enlarged views of the vicinity of the tip of the puncture needle shown in FIGS. 5 (a) and 5 (b), respectively. It is the figure which looked at the puncture needle shown in Drawing 5 from the needle tip side of a central axis direction. 8 (a), (b), (c), (d), and (e) are a VV sectional view, a VI-VI sectional view, a VII-VII sectional view, and a VIII-VIII sectional view, respectively, in FIG. 6 (a). It is a figure and IX-IX sectional drawing. FIG. 6 is a plan view of the front side in the vicinity of the tip of a puncture needle as a modification of the puncture needle shown in FIG. 5. FIG. 10 is a view showing a puncture needle as a modification of the puncture needle shown in FIG. 5, FIG. 10 (a) is a plan view of the front side near the tip, and FIG. 10 (b) is a side view near the tip. is there. 11 (a), (b), (c), and (d) are respectively a plan view, a side view, a plan view and a perspective view of a puncture needle as an embodiment of the present invention. . 12 (a) and 12 (b) are enlarged views of the vicinity of the distal end portion of the puncture needle shown in FIGS. 11 (a) and 11 (b), respectively. It is the figure which looked at the puncture needle shown in Drawing 11 from the needle point side of a central axis direction. 14 (a), (b), (c), (d), and (e) are respectively the XX sectional view, the XI-XI sectional view, the XII-XII sectional view, and the XIII-XIII sectional view in FIG. 12 (a). It is a figure and XIV-XIV sectional drawing. FIG. 12 is a side view of the vicinity of the tip of a puncture needle as a modification of the puncture needle shown in FIG. 11. It is a figure which shows the puncture needle as a modification of the puncture needle shown in FIG. 1, FIG.16 (a) is a top view near the front-end | tip part, FIG.16 (b) is a side view near the front-end | tip part. is there. It is a figure which shows the puncture needle as a modification of the puncture needle shown in FIG. 11, FIG.17 (a) is a top view of the front side of a puncture needle, FIG.17 (b) is a side view of a puncture needle, FIG. 17C is a plan view of the back side of the puncture needle. FIGS. 18A and 18B are diagrams showing a puncture needle as a modification of the puncture needle shown in FIG. 1, FIG. 18A is a plan view of the front side near the tip, and FIG. 18B is a side view near the tip. is there.

  Hereinafter, an embodiment of a medical puncture needle and a method for manufacturing a medical puncture needle according to the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the common member in each figure.

<Embodiment 1>
First, a puncture needle 1 as an embodiment of a medical puncture needle according to the present invention will be described. FIG. 1 shows a puncture needle 1. Specifically, FIG. 1 (a) is a plan view of the front side of the puncture needle 1, FIG. 1 (b) is a side view of the puncture needle 1, and FIG. 1 (c) is a plan view of the back side of the puncture needle 1. FIG. FIG. 1 (d) is a perspective view of the puncture needle 1.

  As shown in FIGS. 1A to 1D, a puncture needle 1 has a main body portion 2 having a substantially circular cross-sectional outer shape and a distal end portion 3 that is continuous with one end of the main body portion 2 and has a flat cross-sectional outer shape. And defines a hollow portion 10 that communicates from the main body portion 2 to the distal end portion 3. In addition, the “cross section” of the “cross sectional outline” referred to here means a cross section orthogonal to the direction parallel to the central axis O of the main body 2. Hereinafter, the direction parallel to the central axis O of the main body 2 is simply referred to as “central axial direction A”.

  Specifically, the main body portion 2 of the present embodiment has a cylindrical shape, and the distal end portion 3 of the present embodiment has a cylindrical shape whose cross-sectional outer shape is an ellipse.

  The distal end portion 3 includes a first blade surface portion 5 and a second blade surface portion 6 that form a blade edge 9 having the needle tip 8 as one end by a ridge line intersecting with each other. Each of the 1st blade surface part 5 and the 2nd blade surface part 6 of this embodiment is comprised by one plane. Each of the first blade surface portion 5 and the second blade surface portion 6 extends while being inclined with respect to the central axis direction A in a side view (see FIG. 1B). The “needle tip” means the tip of the puncture needle 1 in the central axis direction A. That is, the “needle tip” is the tip of the puncture needle 1 and the tip of the tip portion 3.

  In the front end portion 3 of the present embodiment, the back surface opposite to the front surface on which the first blade surface portion 5 and the second blade surface portion 6 are formed has a central axis in a side view (see FIG. 1B). A blade surface portion constituted by a flat surface or a curved surface inclined with respect to the direction A is not formed. That is, the back surface of the tip portion 3 is constituted by the outer peripheral surface of the cylindrical tip portion 3.

  FIGS. 2A and 2B are enlarged views of the vicinity of the distal end portion 3 of the puncture needle 1 shown in FIGS. 1A and 1B, respectively. FIG. 3 is a view of the puncture needle 1 as viewed from the side of the needle tip 8 in the central axis direction A.

  As shown in FIG. 3, the needle tip 8 is viewed from the outer periphery of the main body 2 when viewed in the central axis direction A (for convenience of explanation, the portion of the outer periphery that is not visible from the viewpoint of FIG. 3 is indicated by a broken line BL). Is also located inside. By setting the position of the needle tip 8 when viewed in the central axis direction A to such a position, the length in the central axis direction A is set to the central axis direction A for the first blade surface portion 5 and the second blade surface portion 6. The center axis is the same as the length of the first blade surface portion and the second blade surface portion in the center axis direction A in the comparative configuration in which the position of the needle tip when viewed in the above is on the outer periphery of the main body portion or on the outer side of the outer periphery. The inclination angle with respect to the direction A can be made smaller than the inclination angle with respect to the central axis direction A of the first blade surface portion and the second blade surface portion in the comparative configuration described above. Therefore, it is easy to realize the first blade surface portion 5 and the second blade surface portion 6 that can reduce the pressing force pressed toward the back side from the body tissue during puncturing. That is, it becomes easy to realize the puncture needle 1 that improves the straightness.

  Further, as described above, if the position of the needle tip 8 when viewed in the central axis direction A is set to the inside of the outer periphery of the main body portion 2, the position of the needle tip when viewed in the central axis direction A is the main body portion. The blade edge angle α is further reduced while the lengths in the central axis direction A of the first blade surface portion 5 and the second blade surface portion 6 are the same length as compared with the configuration located on the outer periphery or outside the outer periphery. Can do. Therefore, it is easy to realize the puncture needle 1 having a thin blade edge and capable of reducing the piercing resistance at the blade edge. The blade edge angle means an angle at which the blade edge and the surface opposite to the blade edge meet at the needle tip in a side view of the puncture needle. Specifically, the blade edge angle α of the present embodiment is such that the blade edge 9 and the back surface opposite to the blade edge 9 intersect at the needle tip 8 in a side view of the puncture needle 1 (see FIG. 2B). Is an angle.

  When the puncture needle 1 of the present embodiment is used as an inner needle that is used by being inserted into a catheter, the needle tip 8 is positioned inside the outer periphery of the main body 2 in the radial direction. It is possible to prevent the tip 8 from piercing and damaging the inner surface of the catheter.

  Here, the longitudinal direction of the tip portion 3 in the cross section orthogonal to the central axis direction A is defined as the long axis direction B of the tip portion 3, and the short direction of the tip portion 3 in the cross section orthogonal to the central axis direction A is defined as the tip portion 3. The minor axis direction is C. In such a case, when the distal end portion 3 is viewed in the central axis direction A, both ends of the distal end portion 3 in the long axis direction B are located outside the outer periphery of the main body portion 2 and both ends of the distal end portion 3 in the short axis direction C. Is located inside the outer periphery of the main body 2.

  By adopting such a configuration, when the tip portion is viewed in the central axis direction A, both the long-axis direction both ends and the short-axis direction both ends are located on the outer periphery of the main body or on the inner side of the outer periphery. Compared to the above, it becomes easy to ensure a large cross-sectional area at the position of the distal end portion 3 of the hollow portion 10. Therefore, for example, the cross-sectional area at the position of the tip portion 3 in the hollow portion 10 is easily equal to or larger than the cross-sectional area at the position of the main body portion 2 in the hollow portion 10 and has a flat cross-sectional outer shape. 3 can prevent the liquid from passing through easily.

  In the present embodiment, the maximum inner diameter in the major axis direction B of the distal end portion 3 is larger than the inner diameter of the main body portion 2. And in this embodiment, the cross-sectional area in the position of the front-end | tip part 3 in the hollow part 10 is substantially equal to the cross-sectional area in the position of the main-body part 2 in the hollow part 10. FIG.

  Further, the needle tip 8 of the present embodiment is formed at one end in the short axis direction C when viewed in the central axis direction A (see FIG. 3), but when viewed in the central axis direction A (FIG. 3). It is only necessary to be located inside the outer periphery of the main body 2, and is not limited to the position of the needle tip 8 in the present embodiment. However, the needle tip 8 has a position at one end in the short axis direction C or in the vicinity of one position in the short axis direction C (hereinafter, the position of one end in the short axis direction C and the position near it). (It is described as “position on one end side in the short axis direction C”). If it does in this way, in the front-end | tip part 3 which has a flat cross-sectional external shape like the elliptical shape of this embodiment, the 1st blade surface part 5 and the 2nd blade surface part 6 can be formed in a position with a large curvature radius. it can. Accordingly, the ratio of the length of the cutting edge at which the crossing angle τ (see FIG. 4 and the like) is a predetermined angle (for example, 60 degrees) or less with respect to the lengths of the outer edges of the first blade surface portion 5 and the second blade surface portion 6 is determined. Can be high.

  More specifically, if the first blade surface portion 5 and the second blade surface portion 6 are formed at positions where the curvature radius is large, the tangent at the position of the outer edge of the outer peripheral surface of the tip portion 3 in the cross section orthogonal to the central axis direction A. The tangential inclination angle P (see FIG. 4) with respect to the major axis direction B of the tangent line at each outer edge position of the first blade surface portion 5 and the second blade surface portion 6 is difficult to change depending on the position in the central axis direction A. That is, the rate of change due to the position of the tangential inclination angle P in the central axis direction A can be reduced. As a result, the rate of change of the crossing angle τ (see FIG. 4 and the like) in the central axis direction A becomes small. As a result, the crossing angle τ with respect to the lengths of the outer edges of the first blade surface portion 5 and the second blade surface portion 6 respectively. It is possible to increase the ratio of the length of the cutting edge at which the angle (see FIG. 4 etc.) is a predetermined angle (for example, 60 degrees) or less.

  The outer edge of each of the first blade surface portion 5 and the second blade surface portion 6 is formed by a ridge line where each of the first blade surface portion 5 and the second blade surface portion 6 intersects with the outer peripheral surface on the back side of the tip portion 3. Part. The cutting edge of the present embodiment is a predetermined length from the needle tip 8 where the crossing angle τ is equal to or less than a predetermined angle (for example, 60 degrees) among the outer edges of the first blade surface portion 5 and the second blade surface portion 6. It means the part that spans. The crossing angle τ is an angle formed by the first blade surface portion 5 and a tangent line on the outer peripheral surface at the outer edge position of the first blade surface portion 5 in the cross section orthogonal to the central axis direction A, and the center In the cross section orthogonal to the axial direction A, it means an angle formed by the second blade surface portion 6 and a tangent on the outer peripheral surface at the outer edge position of the second blade surface portion 6 (see FIG. 4 and the like). The cutting blade shown here cuts the skin together with the blade edge 9 at the time of puncturing. Therefore, by increasing the ratio of the cutting edge at the outer edge of each of the first blade surface portion 5 and the second blade surface portion 6, the outer edge of each of the first blade surface portion 5 and the second blade surface portion 6 passes at the time of puncturing. The pain felt by the patient can be reduced.

  As a material of the main body 2 and the tip 3 in the present embodiment, for example, a metal material such as stainless steel, aluminum or aluminum alloy, titanium or titanium alloy can be used.

  Hereafter, each structure and characteristic part of this embodiment are demonstrated in detail.

[Main unit 2]
The main body 2 of the present embodiment is a tubular body in which the inner diameter of the inner peripheral surface and the outer diameter of the outer peripheral surface are uniform in the central axis direction A, and the end opposite to the tip 3 side in the central axis direction A The unit is connected to a medical instrument such as a syringe through a needle base or the like.

  In addition, although the internal diameter of the inner peripheral surface of the main-body part 2 of this embodiment and the outer diameter of an outer peripheral surface are uniform irrespective of the position of the center axis direction A, it is not restricted to this structure. For example, the inner diameter of the inner peripheral surface and the outer diameter of the outer peripheral surface of the main body may be configured to gradually decrease toward the distal end in the central axis direction A. Further, for example, the outer diameter of the main body portion may be a tapered shape that gradually decreases toward the tip end side in the central axis direction A, and the inner diameter of the main body portion may be uniform in the central axis direction A. Furthermore, the inner diameter and outer diameter of the main body portion are used for the puncture needle, for example, in a part of the region in the central axis direction A, a portion where the inner diameter gradually decreases or gradually increases toward the distal end side in the central axis direction A. Various configurations can be employed according to the above.

[Tip 3]
The center axis of the tip 3 of the present embodiment is substantially coincident with the center axis O of the main body 2. Moreover, the blade surface 4 including the first blade surface portion 5 and the second blade surface portion 6 is formed at the distal end portion 3 of the present embodiment.

  More specifically, the blade surface 4 of the present embodiment is configured only by the front blade surface 4a including the first blade surface portion 5 and the second blade surface portion 6 described above, and does not have a back blade surface. The front blade surface 4 a of the present embodiment is configured by the first blade surface portion 5 and the second blade surface portion 6 described above, and the third blade surface portion 7 that is continuous with the first blade surface portion 5 and the second blade surface portion 6. ing.

  The blade surface 4 including the first blade surface portion 5 and the second blade surface portion 6 of the present embodiment extends only within the tip portion 3. Specifically, in the blade surface 4 of the present embodiment, the end portion on the base end side that is opposite to the needle tip 8 side in the central axis direction A is configured by the third blade surface portion 7, and this The three blade surface portions 7 terminate in the tip portion 3 and do not reach the main body portion 2 in the central axis direction A.

  In addition, the distal end portion 3 of the present embodiment includes an elliptical cylindrical blade surface forming portion 3a on which the above-described blade surface 4 is formed, and a cylindrical connection that connects the blade surface forming portion 3a and the main body portion 2. Part 3b.

  The blade surface forming portion 3a has the same length of the major axis R1 and the minor axis R2 regardless of the position in the central axis direction A, except for the region where the blade surface 4 on the needle tip 8 side is formed in the central axis direction A. It has such an elliptical cylindrical shape. In this embodiment, the maximum width S1 of the blade surface forming portion 3a in the front view of FIG. 2A is larger than the outer diameter of the main body portion 2, and the blade surface forming portion in the side view of FIG. The maximum width (maximum thickness) S <b> 2 of 3 a is smaller than the outer diameter of the main body 2.

  The connecting portion 3b has a cylindrical shape in which the outer shape of an arbitrary cross section orthogonal to the central axis direction A is substantially elliptical. The central axis of the blade surface forming portion 3 a and the central axis of the connecting portion 3 b are substantially coincident with the linear central axis O of the main body 2.

  Here, the outer peripheral surface of the connecting portion 3b of the distal end portion 3 is in the direction of the central axis in a side view (see FIGS. 1B and 2B) when the distal end portion 3 is viewed in the major axis direction B. It has the taper part 15 which thickness (length of the minor axis direction C) decreases gradually as it goes to the needle tip 8 by A. More specifically, on the outer peripheral surface of the connecting portion 3b, the tip 3 is opposed to the long-axis direction B when viewed from the side (see FIGS. 1 (b) and 2 (b)). A front inclined portion 15a and a back inclined portion 15b are formed which are inclined so as to approach the central axis O as they move toward the needle tip 8 in the central axis direction A, respectively. In other words, the front inclined portion 15a is formed in a portion of the outer peripheral surface of the connecting portion 3b that is located on one side in the short axis direction C of the tip portion 3. Moreover, the back inclined part 15b is formed in the part located in the other side of the short axis direction C of the front-end | tip part 3 among the outer peripheral surfaces of the connection part 3b. And the taper part 15 is comprised by the front inclination part 15a and the back inclination part 15b.

  The puncture needle 1 of the present embodiment includes the front inclined portion 15a and the back inclined portion 15b, and is pressed from both sides in the short axis direction C by the body tissue during puncturing. Specifically, the puncture needle 1 is pressed from the front side to the back side by the body tissue via the front inclined portion 15a, and is pressed from the back side to the front side by the body tissue via the back inclined portion 15b. The As described above, when the puncture needle 1 is configured to be pressed from both the front side and the back side by the body tissue, the traveling direction of the needle tip 8 of the puncture needle 1 is not easily shifted to the front side or the back side. Therefore, the puncture needle 1 can be moved straight ahead more easily.

  In the present embodiment, the center of the front inclined portion 15a and the back inclined portion 15b in the side view (see FIGS. 1 (b) and 2 (b)) viewed from the front end portion 3 facing the major axis direction B. The inclination angle with respect to the axial direction A is larger than the inclination angle with respect to the central axial direction A of the front blade surface 4a. Here, the angle of inclination of the front blade surface 4a with respect to the central axis direction A is a side view (see FIGS. 1 (b) and 2 (b)) when the front end portion 3 is viewed facing the major axis direction B. A straight line connecting the needle tip 8 and one end of the front blade surface 4a opposite to the needle tip 8 side in the central axis direction A (hereinafter referred to as “base end side in the central axis direction A”) is It means an angle formed with respect to the central axis direction A.

  Further, in the present embodiment, the outer peripheral surface of the connecting portion 3b of the distal end portion 3 is in the central axis direction A in a front view (see FIG. 2A) when the distal end portion 3 is viewed facing the short axis direction C. The taper portion 16 has a width (length in the long axis direction B) gradually increasing toward the needle tip 8. More specifically, as shown in FIG. 2A, the needle tip 8 in the central axis direction A is formed on the outer peripheral surface of the connecting portion 3b of the present embodiment on the one side in the long axis direction B. A first side inclined portion 16a that is inclined away from the central axis O as it goes to is formed. In addition, a second side inclined portion that inclines away from the central axis O toward the needle tip 8 in the central axis direction A in a portion located on the other side in the major axis direction B of the outer peripheral surface of the connecting portion 3b. 16b is formed. And the taper part 16 is comprised by the 1st side surface inclination part 16a and the 2nd side surface inclination part 16b.

[First blade surface portion 5 and second blade surface portion 6]
As shown in FIG. 2A, each of the first blade surface portion 5 and the second blade surface portion 6 is continuous with the third blade surface portion 7 on the main body portion 2 side in the central axis direction A. More specifically, the first blade surface portion 5 and the second blade surface portion 6 are respectively continuous with the third blade surface portion 7 on both sides of the center plane X. The central plane X means a virtual plane including the entire central axis O of the main body 2 and the needle tip 8. Further, the center plane X of the present embodiment is a plane including not only the needle tip 8 but also the blade edge 9. Furthermore, the center plane X of the present embodiment is a plane including the entire minor axis R2 of the tip 3.

  In addition, although the 1st blade surface part 5 and the 2nd blade surface part 6 of this embodiment are respectively comprised by the plane, it is not restricted to this structure, For example, the 1st blade comprised by the curved surface mentioned later, for example. It can also be set as a surface part and a 2nd blade surface part (refer FIG.16 and FIG.17). Moreover, you may make it comprise either one of a 1st blade surface part and a 2nd blade surface part by a plane, and the other comprises a curved surface.

  Here, the outer edge of at least one blade surface portion of the first blade surface portion 5 and the second blade surface portion 6 is more than the outer periphery of the main body portion 2 when the tip portion 3 is viewed in the central axis direction A (see FIG. 3). It is preferable to extend to the outside. As described above, the distal end portion 3 of the puncture needle 1 of the present embodiment has a flat cross-sectional outer shape, and the needle tip 8 is formed at a position on one end side in the minor axis direction C. Therefore, as described above, of the outer edges of the first blade surface portion 5 and the second blade surface portion 6, the portion of the cutting blade whose crossing angle τ (see FIG. 4 and the like) is a predetermined angle (for example, 60 degrees) or less is lengthened. Easy to secure. In addition, as in the present embodiment, when the outer edge of at least one blade surface portion of the first blade surface portion 5 and the second blade surface portion 6 looks at the tip portion 3 in the central axis direction A (see FIG. 3). If the tip portion 3 is viewed in the central axis direction A (see FIG. 3), the tip portion 3 extends from the needle tip 8 to the outside of the outer periphery of the main body portion 2. It is easy to realize a long cutting edge in the long axis direction B. If such a long cutting edge can be realized, the pain felt by the patient due to the passage of the outer edge of at least one of the first blade surface portion 5 and the second blade surface portion 6 during puncture can be further reduced.

  As described above, when the outer edge of at least one blade surface portion of the first blade surface portion 5 and the second blade surface portion 6 is viewed from the front end portion 3 in the central axis direction A (see FIG. 3), the main body portion 2. However, the outer edges of both the first blade surface portion 5 and the second blade surface portion 6 have the distal end portion 3 in the central axis direction as in the present embodiment. When viewed in A (see FIG. 3), it is more preferable that the configuration extends to the outside of the outer periphery of the main body 2. In this way, both the cutting edge at the outer edge of the first blade surface portion 5 and the cutting edge at the outer edge of the second blade surface portion 6 can be secured long in the long axis direction B. With such a cutting edge, the pain felt by the patient during puncture can be further reduced.

  Further, the outer edge of the first blade surface portion 5 of the present embodiment has the maximum width of the tip portion 3 in the long axis direction B from the needle tip 8 when the tip portion 3 is viewed in the central axis direction A (see FIG. 3). The position is reached. Further, not only the outer edge of the first blade surface portion 5 but also the outer edge of the second blade surface portion 6 of the present embodiment is long from the needle tip 8 when the tip portion 3 is viewed in the central axis direction A (see FIG. 3). In the axial direction B, it reaches a position where the width of the tip 3 is maximum. In other words, the outer edges of the first blade surface portion 5 and the second blade surface portion 6 of the present embodiment extend at least from the needle tip 8 until reaching the plane including the entire major axis R1 of the tip portion 3. In the present embodiment, the plane including the entire major axis R1 includes the entire central axis O and is a plane orthogonal to the central plane X.

  With such a configuration, a cutting edge can be formed over the entire width in the major axis direction B of the tip 3. Then, when a cutting edge having a crossing angle τ of a predetermined angle (for example, 60 degrees) or less can be formed over the entire width in the major axis direction B of the distal end portion 3, the patient feels that the distal end portion 3 passes during puncturing. Pain can be further reduced.

  In the present embodiment, the outer edges of both the first blade surface portion 5 and the second blade surface portion 6 are long-axis direction from the needle tip 8 when the tip portion 3 is viewed in the central axis direction A (see FIG. 3). In B, the width of the tip portion 3 reaches the maximum position, but the outer edge of at least one of the first blade surface portion 5 and the second blade surface portion 6 has the tip portion 3 in the central axis direction. What is necessary is just the structure which has reached | attained the position where the width | variety of the front-end | tip part 3 becomes the largest in the major axis direction B from the needle tip 8, when it sees by A (refer FIG. 3). However, as in this embodiment, both outer edges of the first blade surface portion 5 and the second blade surface portion 6 are long from the needle tip 8 when the tip portion 3 is viewed in the central axis direction A (see FIG. 3). If it is set as the structure which has reached | attained the position where the width | variety of the front-end | tip part 3 becomes the largest in the axial direction B, as above-mentioned, there exists a possibility that a cutting edge can be formed over the major axis direction B full width of the front-end | tip part 3. The pain felt by the patient can be greatly reduced.

[Blade 9]
As described above, the blade edge 9 is formed by a ridge line where the first blade surface portion 5 and the second blade surface portion 6 intersect. Further, as described above, the blade edge 9 of the present embodiment extends on the central plane X, and the needle tip 8 that is one end of the blade edge 9 is also positioned on the central plane X. That is, the puncture needle 1 in this embodiment is a hollow needle having a symmetric configuration with respect to the central plane X.

  When the tip of the puncture needle 1 is sharpened and the blade edge 9 is provided as in the present embodiment, when the puncture needle 1 is punctured into the human body, the blade edge 9 or the first blade surface portion in the vicinity of the blade edge 9 is used. The outer edge of 5 and the outer edge of the second blade surface portion 6 serve as a cutting blade that cuts through the skin, and the resistance applied to the skin during puncture can be reduced. Therefore, the pain felt by the patient or the like who is punctured with the puncture needle 1 can be reduced.

[Third blade surface portion 7]
As described above, the first blade surface portion 5 and the second blade surface portion 6 are respectively continuous with the third blade surface portion 7 on the main body portion 2 side in the central axis direction A. Further, the main body 2 side of the third blade surface portion 7 is continuous with the outer peripheral surface of the cylindrical tip portion 3.

  The 3rd blade surface part 7 of this embodiment is comprised by the one plane which inclines so that it may approach the center axis line O as it goes to the needle tip 8 side in the center axis direction A. However, the third blade surface portion 7 may be a convex curved surface that is inclined so as to approach the central axis O toward the needle tip 8 in the central axis direction A.

  The third blade surface portion 7 is inclined so as to gradually approach the central axis O in the central axis direction A toward the needle tip 8 side, and the inclination angle of the third blade surface portion 7 with respect to the central axis direction A is the center It is larger than the inclination angle of the outer wall of the main body 2 with respect to the central axis direction A in the cross section including the entire axis O. In the present embodiment, the outer diameter of the main body 2 is uniform in the central axis direction A, and the outer wall of the main body 2 extends in the central axial direction A when viewed in a cross section including the entire central axis O. doing. Therefore, if the third blade surface portion 7 is inclined with respect to the central axis direction A, the inclination angle of the third blade surface portion 7 is larger than the inclination angle of the outer wall of the main body portion 2. However, when the main body 2 has a configuration in which the outer diameter gradually decreases or gradually increases toward the distal end portion 3 in the central axis direction A, the third blade surface portion 7 is only inclined with respect to the central axis direction A. Instead, it is configured to be inclined with respect to the outer wall of the main body 2 in a cross section including the entire central axis O.

  Here, when the third blade surface portion 7 is a curved surface, the above-described “inclination angle of the third blade surface portion with respect to the central axis direction” means that the third blade is in a cross section including the entire central axis and passing over the third blade surface portion. The tangent at an arbitrary point on the surface means the angle formed with the central axis.

  Moreover, although the front blade surface 4a of this embodiment is comprised by the 1st blade surface part 5, the 2nd blade surface part 6, and the 3rd blade surface part 7, the 1st blade surface part and 2nd blade which form a blade edge at least. The shape may be any as long as it includes a surface portion, and is not limited to the shapes of the first blade surface portion 5 and the second blade surface portion 6 of the present embodiment. Moreover, although the front blade surface 4a of this embodiment is the structure which has the 3rd blade surface part 7 in addition to the 1st blade surface part 5 and the 2nd blade surface part 6, it is not restricted to this structure, For example, It is also possible to use the front blade surface of only the first blade surface portion and the second blade surface portion. For example, in addition to a 1st blade surface part and a 2nd blade surface part, it is good also as a front blade surface provided with two or more blade surface parts. And the contour shape and surface shape of each blade surface portion in the front blade surface are particularly limited except that the first blade surface portion and the second blade surface portion intersect with each other to form a blade edge having the needle tip as one end. Instead, it can be set as appropriate according to the number of blade surface portions, the position of each blade surface portion, and the like.

[Cross sectional shape of the blade surface 4]
Next, the shape in the cross section orthogonal to the central axis direction A of the blade surface 4 of the present embodiment will be described. 4A, 4B, 4C, and 4D are a cross-sectional view taken along a line II, a cross-sectional view taken along line II-II, a cross-sectional view taken along line III-III, and a cross-sectional view taken along line IV-IV, respectively.

  Specifically, FIG. 4A shows a cross section orthogonal to the central axis direction A at the position where the blade edge 9 is formed in the central axis direction A. FIG. As shown in FIG. 4A, each of the first blade surface portion 5 and the second blade surface portion 6 in the II section of FIG. 2A is inclined with respect to the center plane X at an acute angle θ1. . Further, as shown in FIG. 4A, the outer edges of the first blade surface portion 5 and the second blade surface portion 6 in the II section of FIG. 2A form a cutting edge having an intersection angle τ1 of 60 degrees or less. ing.

  4B is a base end side with respect to the blade edge 9 in the central axis direction A, and is orthogonal to the central axis direction A at the position where the first blade surface portion 5 and the second blade surface portion 6 are formed. A cross section is shown. As shown in FIG. 4B, each of the first blade surface portion 5 and the second blade surface portion 6 in the II-II cross section of FIG. 2A is an acute angle with respect to the center plane X, as in FIG. Is inclined at an angle θ1. Further, as shown in FIG. 4B, the outer edges of the first blade surface portion 5 and the second blade surface portion 6 in the II-II cross section of FIG. 2A are cut edges having an intersection angle τ2 of 60 degrees or less. Forming. However, the intersection angle τ2 in FIG. 4B is larger than the intersection angle τ1 in FIG.

  FIG. 4C shows a position where the width of the tip portion 3 in the major axis direction B is maximum in the central axis direction A, and the first blade surface portion 5 and the second blade surface portion 6 are formed. A cross section perpendicular to the central axis direction A at the position is shown. As shown in FIG. 4 (c), the first blade surface portion 5 and the second blade surface portion 6 in the III-III cross section of FIG. 2 (a) are respectively centered as in FIGS. 4 (a) and 4 (b). It is inclined with respect to the plane X at an acute angle θ1. As shown in FIG. 4C, the third blade surface portion 7 in the III-III cross section of FIG. 2A extends at an angle γ3 of about 90 degrees with respect to the central plane X. Further, as shown in FIG. 4C, the outer edges of the first blade surface portion 5 and the second blade surface portion 6 in the III-III cross section of FIG. Does not form.

  FIG. 4D shows a cross section orthogonal to the central axis direction A at the position where the third blade surface portion 7 is formed in the central axis direction A. FIG. As shown in FIG. 4D, the third blade surface portion 7 in the IV-IV cross section of FIG. 2A forms an angle γ3 of approximately 90 degrees with respect to the center plane X, as in FIG. It is extended. As shown in FIG. 4 (d), the outer edge of the third blade surface portion 7 in the IV-IV cross section of FIG. 2 (a) has a crossing angle τ4 larger than 60 degrees and does not form a cutting edge.

  Thus, each of the first blade surface portion 5 and the second blade surface portion 6 extends on a straight line in a cross-sectional view orthogonal to the central axis direction A (see FIGS. 4A to 4C). The angle θ of each of the first blade surface portion 5 and the second blade surface portion 6 in the present embodiment with respect to the center plane X in the cross section orthogonal to the center axis direction A is constant (θ1) regardless of the position in the center axis direction A. . Moreover, the 3rd blade surface part 7 is extended on the straight line in the cross sectional view (refer FIG.4 (c) and FIG.4 (d)) orthogonal to the center axis direction A, The 3rd blade surface part in this embodiment 7 is constant (substantially 90 degrees in the present embodiment) regardless of the position in the central axis direction A in the cross section orthogonal to the central axis direction A.

  Furthermore, as shown in FIGS. 3, 4 (a), and 4 (b), the outer edges of the first blade surface portion 5 and the second blade surface portion 6 of the present embodiment extend outward from the outer periphery of the main body portion 2. A cutting edge is formed that extends from the needle tip 8 to the outside of the outer periphery of the main body 2 and has a crossing angle τ of a predetermined angle (for example, 60 degrees) or less. In the present embodiment, when the outer edges of the first blade surface portion 5 and the second blade surface portion 6 are viewed from the needle tip 8 in the long axis direction B when the tip portion 3 is viewed in the central axis direction A (see FIG. 3). Although the tip 3 has reached the position where the width is maximum, as shown in FIG. 4C, the cutting edge whose crossing angle τ is equal to or smaller than a predetermined angle (for example, 60 degrees) is long from the needle tip 8. It does not reach the position where the width of the tip 3 is maximum in the axial direction B. That is, in the cross section of FIG. 4C, the crossing angle τ3 is very large (for example, larger than 60 degrees) and does not form a cutting edge.

  However, it is also possible to form a cutting edge in which the crossing angle τ is a predetermined angle (for example, 60 degrees) or less from the needle tip 8 to a position where the width of the tip 3 is maximum in the long axis direction B. Is possible. With such a configuration, since the cutting edge is formed over the entire width in the long axis direction B of the distal end portion 3, the pain felt by the patient when the puncture needle 1 is punctured can be greatly reduced.

<Embodiment 2>
Next, a medical puncture needle 51 as an embodiment different from the above-described medical puncture needle 1 will be described with reference to FIGS. FIG. 5 shows the puncture needle 51. Specifically, FIG. 5A is a plan view of the front side of the puncture needle 51, FIG. 5B is a side view of the puncture needle 51, and FIG. FIG. FIG. 5D is a perspective view of the puncture needle 51.

  As shown in FIGS. 5A to 5D, the puncture needle 51 includes a main body 52 having a substantially circular cross-sectional outer shape and a distal end 53 having a flat cross-sectional outer shape that is continuous with one end of the main body 52. And defines a hollow portion 60 that communicates from the main body portion 52 to the distal end portion 53. Note that the “cross section” of the “cross-sectional outer shape” here means a cross section orthogonal to the direction parallel to the central axis O of the main body 52. Hereinafter, the direction parallel to the central axis O of the main body 52 is simply referred to as “central axial direction A”.

  The distal end portion 53 includes a first blade surface portion 55 and a second blade surface portion 56 that form a blade edge 59 having the needle tip 58 as one end by a ridge line intersecting with each other. Each of the 1st blade surface part 55 and the 2nd blade surface part 56 of this embodiment is comprised by one plane. Further, each of the first blade surface portion 55 and the second blade surface portion 56 extends while being inclined with respect to the central axis direction A in a side view (see FIG. 5B). The “needle tip” means the tip of the puncture needle 51 in the central axis direction A. That is, the “needle tip” is the tip of the puncture needle 51 and the tip of the tip portion 53.

  A center axis line in a side view (see FIG. 5B) is provided on the back surface, which is opposite to the front surface on which the first blade surface portion 55 and the second blade surface portion 56 are formed, of the distal end portion 53 of the present embodiment. A blade surface portion constituted by a flat surface or a curved surface inclined with respect to the direction A is not formed. That is, the back surface of the tip portion 53 is configured by the outer peripheral surface of the cylindrical tip portion 53.

  FIGS. 6A and 6B are enlarged views of the vicinity of the distal end portion 53 of the puncture needle 51 shown in FIGS. 5A and 5B, respectively. FIG. 7 is a view of the puncture needle 51 as viewed from the needle tip 58 side in the central axis direction A.

  As shown in FIG. 7, the needle tip 58 is seen from the outer periphery of the main body 52 when viewed in the central axis direction A (for convenience of explanation, the portion of the outer periphery that cannot be seen from the viewpoint of FIG. 7 is indicated by a broken line BL). Is also located inside. Therefore, similarly to the puncture needle 1 described above, it is easy to realize the first blade surface portion 55 and the second blade surface portion 56 capable of reducing the pressing force pressed toward the back side from the body tissue during the puncture. That is, it becomes easy to realize the puncture needle 51 that improves the straightness.

  Further, similarly to the puncture needle 1 described above, the first blade surface portion 55 and the first blade surface portion 55 are compared with the configuration in which the position of the needle tip when viewed in the central axis direction A is on the outer periphery of the main body portion or on the outer side of the outer periphery. The blade edge angle α (see FIG. 5B) can be further reduced while the lengths of the two blade surface portions 56 in the central axis direction A are the same.

  Here, the longitudinal direction of the distal end portion 53 in the cross section orthogonal to the central axial direction A is defined as the long axial direction B of the distal end portion 53, and the short direction of the distal end portion 53 in the cross section orthogonal to the central axial direction A is defined as The minor axis direction is C. In such a case, when the distal end portion 53 is viewed in the central axis direction A, both ends of the distal end portion 53 in the major axis direction B are located outside the outer periphery of the main body portion 52 and both ends of the distal end portion 53 in the minor axis direction C. Is located inside the outer periphery of the main body 52. By setting it as such a structure, it becomes easy to ensure large cross-sectional area in the position of the front-end | tip part 53 of the hollow part 60 similarly to the puncture needle 1 mentioned above.

  Further, the needle tip 58 of the present embodiment is formed not at a position on one end side in the long axis direction B but at a position on one end side in the short axis direction C, like the needle tip 8 of the puncture needle 1 described above. Therefore, like the puncture needle 1 described above, the ratio of the length of the cutting blade to the length of the outer edge of each of the first blade surface portion 55 and the second blade surface portion 56 can be increased.

  Hereinafter, among the puncture needles 51 of the present embodiment, points that are different from the above-described puncture needle 1 will be mainly described, and descriptions of common points will be omitted. The puncture needle 51 of the present embodiment is different from the puncture needle 1 described above in the configuration of the tip and the configuration of the blade surface.

  The outer peripheral surface of the distal end portion 53 of the puncture needle 51 has a cylindrical shape in which the length in the major axis direction B gradually increases and the length in the minor axis direction C gradually decreases toward the needle tip 58 side in the central axis direction A. have. Further, the central axis of the distal end portion 53 of the present embodiment substantially coincides with the central axis O of the main body portion 52.

  The puncture needle 51 of the present embodiment has a blade surface 54 including a first blade surface portion 55 and a second blade surface portion 56. More specifically, the blade surface 54 of the present embodiment is configured only by the front blade surface 54a including the first blade surface portion 55 and the second blade surface portion 56 described above, and does not have a back blade surface. That is, the opposite side of the front blade surface 54 a is constituted by the outer peripheral surface of the tip end portion 53. The front blade surface 54 a of the present embodiment includes the first blade surface portion 55 and the second blade surface portion 56 described above, and the third blade surface portion 57 that is continuous with the first blade surface portion 55 and the second blade surface portion 56. ing.

  Here, as shown to Fig.6 (a), the front blade surface 54a of this embodiment is extended from the needle point 58 to the boundary U between the front-end | tip part 53 and the main-body part 52. As shown in FIG. More specifically, the base end in the central axis direction A of the front blade surface 54 a of the present embodiment is configured by the third blade surface portion 57. And the base end side of the central axis direction A of the 3rd blade surface part 57 of this embodiment is following the outer peripheral surface of the main-body part 52. FIG.

  In addition, the puncture needle 51 of the present embodiment includes the first blade surface portion 55 and the second blade surface portion 56 in a side view (see FIG. 6B) when the distal end portion 53 is viewed in the major axis direction B. On the outer peripheral surface of the tip portion 53 located on the back side opposite to the front blade surface 54a, a back inclined portion 65b is formed that inclines so as to approach the center axis O toward the needle tip 58 in the center axis direction A. ing.

  As described above, by providing the back inclined portion 65b on the back side opposite to the front blade surface 54a, the puncture needle 51 in the middle of puncturing is pressed against the front side from the back side via the back inclined portion 65b. Act. Therefore, since at least a part of the pressing force from the front side toward the back side is canceled through the front blade surface 54a, the outer peripheral surface on the opposite side of the front blade surface 54a extends in parallel with the central axis direction A. Compared with the configuration without the back inclined portion 65b of the present embodiment, it is possible to improve straightness.

  In addition, although the front blade surface 54a of this embodiment is extended to the boundary U between the front-end | tip part 53 and the main-body part 52 as mentioned above, it is the structure which terminates in the boundary U. However, the present invention is not limited to this configuration. For example, as in a puncture needle 51 ′ as a modified example shown in FIG. 9, a boundary U ′ between the tip portion 53 ′ and the main body portion 52 ′ is formed from the needle tip 58 ′. It is good also as a structure which has the front blade surface 54a 'extended over main body part 52' ranging. In FIG. 9, the third blade surface portion 57 ′ extends across the boundary U ′. In this way, the front blade surface 54a ′ can be continued to the outer peripheral surface of the main body 52 ′ by a step smaller than the step formed by the boundary U ′, and the puncture resistance due to the step can be reduced and puncture can be performed. Can reduce patient pain.

  Moreover, the inclination angle with respect to the central axis O of the third blade surface portion 57 ′ can be reduced by such a configuration. Therefore, it is possible to reduce the pressing force from the front side to the back side through the front blade surface 54a ', and to improve straightness.

  Further, like the puncture needle 51 ″ as a modified example shown in FIG. 10A and FIG. 10B, the front blade surface 54a ″ extends only within the distal end portion 53 ″, and the front surface One end on the main body 52 ″ side in the central axis direction A of the blade surface 54a ″ may be configured to be continuous with the front inclined portion 65a ″. Note that the front inclined portion 65a ″ refers to the central axis O as it goes toward the needle tip 58 ″ in the central axis direction A in the side view (see FIG. 10B) of the outer peripheral surface of the distal end portion 53 ″. It means the part which inclines so that it may approach. Specifically, in the example illustrated in FIG. 10, the third blade surface portion 57 ″ constituting the base end in the central axis direction A of the front blade surface 54 a ″ is continuous with the front inclined portion 65 a ″. Further, the base end side in the central axis direction A of the front inclined portion 65a ″ extends to the boundary U ″, and is continuous with the outer peripheral surface of the main body portion 52 ″ at the boundary U ″. In the side view shown in FIG. 10B, the inclination angle of the front inclined portion 65a ″ with respect to the central axis direction A is smaller than the inclination angle of the third blade surface portion 57 ″ with respect to the central axis direction A. ing.

  In the example shown in FIG. 10, the back inclined portion 65 b extends to a position facing the front inclined portion 65 a ″ in a side view (see FIG. 10B). In this way, the back inclined portion 65b is located not only on the opposite side of the front blade surface 54a '' but also on the opposite side of the front inclined portion 65a ''. The puncture needle 51 ″ receives a pressing force from the front side to the back side from the body tissue through the front blade surface 54a ″ and the front inclined portion 65a ″ at the time of puncturing, but the back inclined portion 65b is the front blade surface. Since it is located on the opposite side of 54a ″ and the front inclined portion 65a ″, the traveling direction of the puncture needle 51 ″ is suppressed from shifting from the front side to the back side. That is, straightness can be improved.

  The other configurations of the puncture needle 51 ′ and the puncture needle 51 ″ shown in FIGS. 9 and 10 are the same as the configuration of the puncture needle 51 of this embodiment.

  Returning to the description of the puncture needle 51 of the present embodiment again, the outer edges of the first blade surface portion 55 and the second blade surface portion 56 are the same as the first blade surface portion 5 and the second blade surface portion 6 of the puncture needle 1 described above. When the portion 53 is viewed in the central axis direction A (see FIG. 7), the portion 53 extends to the outside of the outer periphery of the main body portion 2. Further, the outer edges of the first blade surface portion 55 and the second blade surface portion 56 of the present embodiment have the distal end portion 53 in the direction of the central axis in the same manner as the first blade surface portion 5 and the second blade surface portion 6 of the puncture needle 1 described above. When viewed in A (see FIG. 7), the tip 53 reaches the position where the width of the distal end portion 53 is maximum in the long axis direction B from the needle tip 58. Thereby, it is easy to ensure a long cutting edge at the outer edges of the first blade surface portion 55 and the second blade surface portion 56. Therefore, it becomes easy to realize the puncture needle 51 that can reduce the pain felt by the patient during puncture.

  Further, the outer peripheral surface of the distal end portion 53 of the present embodiment is directed toward the needle tip 58 in the central axis direction A in a front view (see FIG. 6A) when the distal end portion 53 is viewed facing the short axis direction C. The taper portion 66 is gradually increased in width (length in the long axis direction B). More specifically, the taper portion 66 of the present embodiment gradually increases in the central axis direction A from the boundary U toward the needle tip 58 side, up to a position where it intersects with the outer edges of the first blade surface portion 55 and the second blade surface portion 56. Continue to increase gradually. In other words, the width of the distal end portion 53 in the major axis direction B is maximized at a position where the first blade surface portion 55 and the second blade surface portion 56 are present in the central axis direction A, and the proximal end side in the central axis direction A therefrom. It gradually decreases toward. Therefore, after the outer edges of the first blade surface portion 55 and the second blade surface portion 56 pass through the skin, the outer peripheral surface of the distal end portion 53 is restrained from pulling the skin around the puncture hole so as to be caught in the body from the puncture hole. Can do. Thereby, the pain which a patient feels at the time of puncture of the puncture needle 51 can be reduced.

  In addition, although the 1st blade surface part 55 and the 2nd blade surface part 56 of this embodiment are each comprised by the plane, it is not restricted to this structure, For example, the 1st blade comprised by the curved surface mentioned later, for example. It can also be set as a surface part and a 2nd blade surface part (refer FIG.16 and FIG.17). Moreover, you may make it comprise either one of a 1st blade surface part and a 2nd blade surface part by a plane, and the other comprises a curved surface.

  Furthermore, although the 3rd blade surface part 57 of this embodiment is comprised by the one plane which inclines so that it may approach the central axis O as it goes to the needle point 58 side in the central axial direction A, for example, in the central axial direction A You may comprise by the convex-shaped curved surface which inclines so that it may approach the central axis O as it goes to the needle point 58. FIG.

  Moreover, although the front blade surface 54a of this embodiment is comprised by the 1st blade surface part 55, the 2nd blade surface part 56, and the 3rd blade surface part 57, the 1st blade surface part and 2nd blade which form a blade edge at least. The shape of the first blade surface portion 55 and the second blade surface portion 56 of the present embodiment is not limited as long as it includes a surface portion. Further, the front blade surface 54a of the present embodiment is configured to include the third blade surface portion 57 in addition to the first blade surface portion 55 and the second blade surface portion 56, but is not limited to this configuration. It is also possible to use the front blade surface of only the first blade surface portion and the second blade surface portion. For example, in addition to a 1st blade surface part and a 2nd blade surface part, it is good also as a front blade surface provided with two or more blade surface parts. And the contour shape and surface shape of each blade surface portion in the front blade surface are particularly limited except that the first blade surface portion and the second blade surface portion intersect with each other to form a blade edge having the needle tip as one end. Instead, it can be set as appropriate according to the number of blade surface portions, the position of each blade surface portion, and the like.

  Next, the shape in the cross section orthogonal to the central axis direction A of the blade surface 54 of the present embodiment will be described. 8 (a), (b), (c), (d), and (e) are a VV sectional view, a VI-VI sectional view, a VII-VII sectional view, and a VIII-VIII sectional view, respectively, in FIG. 6 (a). It is a figure and IX-IX sectional drawing.

  Specifically, FIG. 8A shows a cross section orthogonal to the central axis direction A at a position where the blade edge 59 is formed in the central axis direction A. FIG. As shown in FIG. 8A, each of the first blade surface portion 55 and the second blade surface portion 56 in the VV cross section of FIG. 6A is inclined with respect to the center plane X at an acute angle θ5. . Further, as shown in FIG. 8A, the outer edges of the first blade surface portion 55 and the second blade surface portion 56 in the VV cross section of FIG. 6A form a cutting edge having an intersection angle τ5 of 60 degrees or less. ing. The central plane X means a virtual plane including the entire central axis O of the main body 52 and the needle tip 58, as in the first embodiment.

  FIG. 8B is a base end side with respect to the blade edge 59 in the central axis direction A, and is orthogonal to the central axis direction A at the position where the first blade surface portion 55 and the second blade surface portion 56 are formed. A cross section is shown. As shown in FIG. 8 (b), each of the first blade surface portion 55 and the second blade surface portion 56 in the VI-VI cross section of FIG. 6 (a) has an acute angle with respect to the center plane X, as in FIG. 8 (a). Is inclined at an angle θ5. Further, as shown in FIG. 8 (b), the outer edges of the first blade surface portion 55 and the second blade surface portion 56 in the VI-VI cross section of FIG. 6 (a) have cutting edges whose crossing angle τ6 is 60 degrees or less. Forming. However, the intersection angle τ6 in FIG. 8B is larger than the intersection angle τ5 in FIG.

  FIG. 8C shows a position where the width of the distal end portion 53 in the major axis direction B is maximum in the central axis direction A, and the first blade surface portion 55 and the second blade surface portion 56 are formed. A cross section perpendicular to the central axis direction A at the position is shown. As shown in FIG. 8C, each of the first blade surface portion 55 and the second blade surface portion 56 in the VII-VII cross section of FIG. 6A is centered as in FIGS. 8A and 8B. It is inclined with respect to the plane X at an acute angle θ5. As shown in FIG. 8C, the third blade surface portion 57 in the VII-VII cross section of FIG. 6A extends at an angle γ7 of about 90 degrees with respect to the central plane X. Further, as shown in FIG. 8C, the outer edges of the first blade surface portion 55 and the second blade surface portion 56 in the VII-VII cross section of FIG. The blade is not formed.

  FIG. 8D shows a cross section orthogonal to the central axis direction A at the position where the third blade surface portion 57 is formed in the central axis direction A. FIG. As shown in FIG. 8D, the third blade surface portion 57 in the VIII-VIII cross section of FIG. 6A forms an angle γ7 of approximately 90 degrees with respect to the center plane X, as in FIG. 8C. It is extended. As shown in FIG. 8 (d), the outer edge of the third blade surface portion 57 in the VIII-VIII cross section of FIG. 6 (a) has an intersecting angle τ8 larger than 90 degrees and forms a cutting edge. Absent.

  FIG. 8E shows a cross section orthogonal to the central axis direction A at the position where the third blade surface portion 7 is formed in the central axis direction A. FIG. Note that the cross section shown in FIG. 8E is a cross section at a position closer to the base end side than the cross section shown in FIG. As shown in FIG. 8E, the third blade surface portion 57 in the IX-IX cross section of FIG. 6A is approximately 90 with respect to the central plane X, as in FIGS. 8C and 8D. It extends at an angle γ7 of degrees. As shown in FIG. 8 (e), the outer edge of the third blade surface portion 57 in the IX-IX cross section of FIG. 6 (a) forms an intersection angle τ9 larger than 90 degrees, as in FIG. 8 (d). And no cutting edge is formed.

  Thus, each of the first blade surface portion 55 and the second blade surface portion 56 extends on a straight line in a cross-sectional view orthogonal to the central axis direction A (see FIGS. 8A to 8C). The angle θ with respect to the central plane X in the cross section orthogonal to the central axis direction A of each of the first blade surface portion 55 and the second blade surface portion 56 in the present embodiment is constant (θ5) regardless of the position in the central axis direction A. . Moreover, the 3rd blade surface part 57 is extended on the straight line in the cross sectional view (refer FIG.8 (c)-FIG.8 (e)) orthogonal to the center axis direction A, The 3rd blade surface part in this embodiment The angle γ with respect to the central plane X in the cross section orthogonal to the central axis direction A is constant regardless of the position in the central axis direction A (approximately 90 degrees in this embodiment).

  Further, as shown in FIGS. 7, 8A, and 8B, the outer edges of the first blade surface portion 55 and the second blade surface portion 56 of the present embodiment are arranged such that the distal end portion 53 is in the central axis direction A. When viewed, the crossing angle τ extends from the outer periphery of the main body 52 to the outside and extends from the needle tip 58 to the outer side of the outer periphery of the main body 52, and the crossing angle τ is equal to or less than a predetermined angle (for example, 60 degrees). Forming a cutting edge. In the present embodiment, when the outer edges of the first blade surface portion 55 and the second blade surface portion 56 are viewed from the needle tip 58 in the major axis direction B when the tip end portion 53 is viewed in the central axis direction A (see FIG. 7). The cutting edge whose crossing angle τ reaches a predetermined angle (for example, 60 degrees) or less when the width of the distal end portion 3 reaches the maximum has a width of the distal end portion 53 in the major axis direction B from the needle tip 58. The maximum position has not been reached. That is, as shown in FIG. 8C, the crossing angle τ7 is very large (for example, larger than 60 degrees) and does not form a cutting edge.

  However, it is also possible to form a cutting edge in which the crossing angle τ is a predetermined angle (for example, 60 degrees) or less from the needle tip 58 to a position where the width of the distal end portion 53 is maximum in the long axis direction B. Is possible. With such a configuration, since the cutting edge is formed over the entire width in the long axis direction B of the distal end portion 53, the pain felt by the patient when the puncture needle 51 is punctured can be greatly reduced.

<Embodiment 3>
Next, a medical puncture needle 71 as an embodiment different from the above-described medical puncture needle 1 and puncture needle 51 will be described with reference to FIGS. The puncture needle 71 described here has a so-called “back cut type” blade surface shape. FIG. 11 shows the puncture needle 71. Specifically, FIG. 11A is a plan view of the front side of the puncture needle 71, FIG. 11B is a side view of the puncture needle 71, and FIG. 11C is a plan view of the back side of the puncture needle 71. FIG. FIG. 11 (d) is a perspective view of the puncture needle 71.

  As shown in FIGS. 11A to 11D, the puncture needle 71 has a main body 72 having a substantially circular cross-sectional outer shape and a distal end 73 having a flat cross-sectional outer shape that is continuous with one end of the main body 72. And defines a hollow portion 80 that communicates from the main body portion 72 to the distal end portion 73. Here, the “cross section” of the “cross sectional outline” means a cross section orthogonal to the direction parallel to the central axis O of the main body 72. Hereinafter, a direction parallel to the central axis O of the main body 72 is simply referred to as “central axial direction A”.

  Specifically, the main body portion 72 of the present embodiment has a cylindrical shape, and the distal end portion 73 of the present embodiment has a cylindrical shape with an elliptical cross-sectional outer shape.

  The distal end portion 73 includes a first blade surface portion 75 and a second blade surface portion 76 that form a blade edge 79 having the needle tip 78 as one end by a ridge line intersecting with each other. Each of the 1st blade surface part 75 and the 2nd blade surface part 76 of this embodiment is comprised by one plane. The “needle tip” means the tip of the puncture needle 71 in the central axis direction A. That is, the “needle tip” is the tip of the puncture needle 71 and the tip of the tip portion 73.

  In the front end portion 73 of the present embodiment, the front surface opposite to the back surface on which the first blade surface portion 75 and the second blade surface portion 76 are formed has a central axis in a side view (see FIG. 11B). A third blade surface portion 77 constituted by a plane inclined with respect to the direction A is formed.

  FIGS. 12A and 12B are enlarged views of the vicinity of the distal end portion 73 of the puncture needle 71 shown in FIGS. 11A and 11B, respectively. FIG. 13 is a view of the puncture needle 71 viewed from the needle tip 78 side in the central axis direction A.

  As shown in FIG. 13, the needle tip 78 is viewed from the outer periphery of the main body 72 when viewed in the central axis direction A (for convenience of explanation, the portion of the outer periphery that is not visible from the viewpoint of FIG. 13 is indicated by a broken line BL). Is also located inside. Therefore, like the puncture needle 1 and puncture needle 51 described above, it is easy to realize the first blade surface portion 75 and the second blade surface portion 76 that can reduce the pressing force that is pressed toward the back side from the body tissue during the puncture. That is, it is easy to realize the puncture needle 71 that improves straightness.

  Further, like the puncture needle 1 and the puncture needle 51 described above, the front blade surface is compared with a configuration in which the position of the needle tip when viewed in the central axis direction A is positioned on the outer periphery of the main body or on the outer side of the outer periphery. The cutting edge angle α can be further reduced while keeping the length of 74a in the central axis direction A the same. Note that the blade edge angle α of the present embodiment is the blade edge 79 and the third blade surface portion 77 on the front side opposite to the blade edge 79 in a side view of the puncture needle 71 (see FIG. 12B). Is the angle at which the needle point 78 intersects. The outer edges of the first blade surface portion 75 and the second blade surface portion 76 in the present embodiment are the first blade surface portion 75 and the second blade surface portion 76 of the back blade surface 74b and the third blade surface portion of the front blade surface 74a. 77 represents a portion formed by a ridge line intersecting with 77.

  Here, the longitudinal direction of the distal end portion 73 in the cross section orthogonal to the central axis direction A is defined as the long axial direction B of the distal end portion 73, and the short direction of the distal end portion 73 in the cross section orthogonal to the central axial direction A is defined as the distal end portion 73. The minor axis direction is C. In such a case, when the distal end portion 73 is viewed in the central axis direction A, both ends of the distal end portion 73 in the long axis direction B are located outside the outer periphery of the main body portion 72 and both ends of the distal end portion 73 in the short axis direction C. Is located inside the outer periphery of the main body 72. By adopting such a configuration, it is easy to ensure a large cross-sectional area at the position of the distal end portion 73 of the hollow portion 80 as with the puncture needle 1 and the puncture needle 51 described above.

  Further, the needle tip 78 of the present embodiment is not located at one end side in the major axis direction B but at one end side in the minor axis direction C, like the needle tip 8 of the puncture needle 1 or the needle tip 58 of the puncture needle 51 described above. Formed in position. Therefore, compared to a configuration in which the needle tip is formed at a position on one end side in the major axis direction B, an angle θ that is inclined at an acute angle of the first blade surface portion 75 and the second blade surface portion 76 with respect to the center plane X, which will be described later. (Refer to “θ10” in FIG. 14) can be ensured to be large, so that it is easy to ensure the lengths of the outer edges of the first blade surface portion 75 and the second blade surface portion 76 that are the cutting edges.

  Hereinafter, of the puncture needle 71 of the present embodiment, points that are different from the puncture needle 1 and the puncture needle 51 described above will be mainly described, and description of common points will be omitted. The puncture needle 71 of this embodiment is different from the puncture needle 1 and the puncture needle 51 described above in the configuration of the distal end portion and the configuration of the blade surface.

[Tip 73]
The central axis line of the distal end portion 73 of the present embodiment substantially coincides with the central axis line O of the main body portion 72. Further, a blade surface 74 including a first blade surface portion 75 and a second blade surface portion 76 is formed at the distal end portion 73 of the present embodiment.

  The puncture needle 71 of the present embodiment has a so-called “back cut type” blade surface 74 as described above. More specifically, the blade surface 74 of the present embodiment includes a front blade surface 74a and a back blade surface 74b. The front blade surface 74a of the present embodiment is configured by the third blade surface portion 77 described above. Moreover, the back blade surface 74b of this embodiment is comprised by the 1st blade surface part 75 and the 2nd blade surface part 76 which were mentioned above. However, the back blade surface 74b only needs to include the first blade surface portion 75 and the second blade surface portion 76, and may be configured to further include another blade surface portion.

  The blade surface 74 including the first blade surface portion 75 and the second blade surface portion 76 of the present embodiment extends only within the distal end portion 3. Specifically, of the blade surface 74 of the present embodiment, an end portion on the base end side opposite to the needle tip 78 side in the central axis direction A is configured by a third blade surface portion 77. The three-blade surface portion 77 terminates in the distal end portion 73 and does not reach the main body portion 72 in the central axis direction A.

  Further, the distal end portion 73 of the present embodiment includes an elliptical cylindrical blade surface forming portion 73a on which the above-described blade surface 74 is formed, and a cylindrical connection that connects the blade surface forming portion 73a and the main body 72. Part 73b.

  The blade surface forming portion 73a has the same length of the major axis R1 and the minor axis R2 regardless of the position in the central axis direction A, except for the region where the blade surface 74 on the needle tip 78 side is formed in the central axis direction A. It has such an elliptical cylindrical shape. In this embodiment, the maximum width S1 of the blade surface forming portion 73a in the front view of FIG. 12A is larger than the outer diameter of the main body 72, and the blade surface forming portion in the side view of FIG. The maximum width (maximum thickness) S <b> 2 of 73 a is smaller than the outer diameter of the main body 72.

  The connecting portion 73b has a cylindrical shape in which the outer shape of an arbitrary cross section orthogonal to the central axis direction A is substantially elliptical. The central axis of the blade surface forming portion 73 a and the central axis of the connecting portion 73 b are substantially coincident with the linear central axis O of the main body 72.

  Here, the outer peripheral surface of the connecting portion 73b of the distal end portion 73 is in the direction of the central axis in a side view (see FIGS. 11B and 12B) when the distal end portion 73 is viewed in the major axis direction B. It has a taper portion 85 whose thickness (length in the short axis direction C) gradually decreases as it goes toward the needle tip 78 at A. More specifically, on the outer peripheral surface of the connecting portion 73b, in the side view (see FIGS. 11 (b) and 12 (b)) when the tip end portion 73 is viewed facing the major axis direction B, the facing portion is positioned. A front inclined portion 85a and a back inclined portion 85b are formed which are inclined so as to approach the central axis O as they move toward the needle tip 78 in the central axis direction A, respectively. In other words, the front inclined portion 85a is formed in a portion of the outer peripheral surface of the connecting portion 73b located on one side in the short axis direction C of the tip portion 73. Moreover, the back inclined part 85b is formed in the part located in the other side of the short axis direction C of the front-end | tip part 73 among the outer peripheral surfaces of the connection part 73b. And the taper part 85 is comprised by the front inclination part 85a and the back inclination part 85b.

  The puncture needle 71 of the present embodiment includes the front inclined portion 85a and the back inclined portion 85b, and is pressed from both sides in the short axis direction C by the body tissue at the time of puncturing. Specifically, the puncture needle 71 is pressed by the body tissue from the front side to the back side via the front inclined portion 85a, and is also pressed by the body tissue from the back side to the front side via the back inclined portion 85b. The In this way, if the puncture needle 71 is configured to be pressed from both the front side and the back side by the body tissue, the traveling direction of the needle tip 78 of the puncture needle 71 is not easily shifted to the front side or the back side. Therefore, it becomes possible to advance the puncture needle 71 more easily.

  In the present embodiment, the center of the front inclined portion 85a and the back inclined portion 85b is seen in a side view (see FIGS. 11B and 12B) when the distal end portion 73 is viewed in the major axis direction B. The inclination angle with respect to the axial direction A is larger than the inclination angle with respect to the central axial direction A of the third blade surface portion 77 as the front blade surface 74a.

  Further, in the present embodiment, the outer peripheral surface of the connecting portion 73b of the distal end portion 73 is in the central axis direction A in a front view (see FIG. 12A) when the distal end portion 73 is viewed facing the short axis direction C. A taper portion 86 whose width (length in the major axis direction B) gradually increases toward the needle tip 78 is provided. More specifically, as shown in FIG. 12A, the needle tip 78 in the central axis direction A is formed on a portion located on one side in the long axis direction B on the outer peripheral surface of the connecting portion 73 b of this embodiment. A first side inclined portion 86a that is inclined away from the central axis O as it goes to is formed. Further, a second side inclined portion that inclines away from the central axis O toward the needle tip 78 in the central axis direction A in a portion located on the other side in the major axis direction B of the outer peripheral surface of the connecting portion 73b. 86b is formed. And the taper part 86 is comprised by the 1st side surface inclination part 86a and the 2nd side surface inclination part 86b.

[First blade surface portion 75 and second blade surface portion 76]
As shown in FIG. 12A, each of the first blade surface portion 75 and the second blade surface portion 76 is continuous with the outer peripheral surface of the blade surface forming portion 73a of the tip portion 73 on the main body portion 72 side in the central axis direction A. doing. More specifically, the first blade surface portion 75 and the second blade surface portion 76 are continuous with the outer peripheral surface of the blade surface forming portion 73a of the tip portion 73 on both sides of the center plane X, respectively. The central plane X means a virtual plane including the entire central axis O of the main body 72 and the needle tip 78. Further, the center plane X of the present embodiment is a plane including not only the needle tip 78 but also the blade edge 79. Furthermore, the center plane X of the present embodiment is a plane including the entire short axis R2 of the tip end portion 73.

  In addition, although the 1st blade surface part 75 and the 2nd blade surface part 76 of this embodiment are each comprised by the plane, it is not restricted to this structure, For example, the 1st blade comprised by the curved surface mentioned later, for example. It can also be set as a surface part and a 2nd blade surface part (refer FIG.16 and FIG.17). Moreover, you may make it comprise either one of a 1st blade surface part and a 2nd blade surface part by a plane, and the other comprises a curved surface.

  Here, the outer edge of at least one blade surface portion of the first blade surface portion 75 and the second blade surface portion 76 is more than the outer periphery of the main body portion 72 when the tip portion 73 is viewed in the central axis direction A (see FIG. 13). It is preferable to extend to the outside. As described above, the distal end portion 73 of the puncture needle 71 has a flat cross-sectional outer shape, and the needle tip 78 is formed at a position on one end side in the short axis direction C. Therefore, as described above, it is easy to ensure the lengths of the outer edges of the first blade surface portion 75 and the second blade surface portion 76, which are cutting edges whose crossing angle τ is equal to or less than a predetermined angle (for example, 60 degrees). In addition, as in the present embodiment, when the outer edge of at least one of the first blade surface portion 75 and the second blade surface portion 76 looks at the tip portion 73 in the central axis direction A (see FIG. 13). If the tip portion 73 is viewed in the central axis direction A (see FIG. 13), it extends from the needle tip 78 to the outside of the outer periphery of the main body portion 72. It is easy to realize a long cutting edge in the long axis direction B. If such a long cutting edge can be realized, the pain felt by the patient due to the passage of the outer edge of at least one of the first blade surface portion 75 and the second blade surface portion 76 during puncturing can be further reduced. The crossing angle τ of the present embodiment is an angle formed by the first blade surface portion 75 and the third blade surface portion 77 in a cross section orthogonal to the central axis direction A, and a cross section orthogonal to the central axis direction A. It means an angle formed by the second blade surface portion 76 and the third blade surface portion 77 (see “τ10” in FIG. 14).

  Moreover, in this embodiment, when the outer edge of both the blade surface parts of the 1st blade surface part 75 and the 2nd blade surface part 76 sees the front-end | tip part 73 in the center axis direction A (refer FIG. 13), it is the main body part 72. It extends to the outside rather than the outer periphery. In this way, both the cutting edge at the outer edge of the first blade surface portion 75 and the cutting edge at the outer edge of the second blade surface portion 76 can be secured long. With such a cutting edge, the pain felt by the patient during puncture can be further reduced.

  Here, the outer edges of the first blade surface portion 75 and the second blade surface portion 76 of the present embodiment are arranged in the major axis direction B from the needle tip 78 when the tip end portion 73 is viewed in the central axis direction A (see FIG. 13). Although it is the structure which has not reached the position where the width | variety of the front-end | tip part 73 becomes the maximum, the width | variety of the front-end | tip part 73 is the maximum similarly to the outer edge of the 1st blade surface part 5 and the 2nd blade surface part 6 of the puncture needle 1 mentioned above. It is good also as a structure which reaches | attains.

  In other words, the outer edges of the first blade surface portion 75 and the second blade surface portion 76 of the present embodiment terminate before reaching the plane including the entire major axis R1 of the tip portion 73 from the needle tip 78. In the present embodiment, the plane including the entire major axis R1 includes the entire central axis O and is a plane orthogonal to the central plane X.

[Blade 79]
As described above, the blade edge 79 of the present embodiment is formed by a ridge line where the first blade surface portion 75 and the second blade surface portion 76 of the back blade surface 74b intersect. Further, as described above, the blade edge 79 of the present embodiment extends on the central plane X, and the needle tip 78 that is one end of the blade edge 79 is also positioned on the central plane X. That is, the puncture needle 71 in the present embodiment is a hollow needle having a symmetric configuration with respect to the central plane X.

  When the tip of the puncture needle 71 is sharpened and the blade edge 79 is provided as in the present embodiment, when the puncture needle 71 is punctured into the human body, the blade edge 79 or the first blade surface portion in the vicinity of the blade edge 79 is provided. The outer edge of 75 and the outer edge of the 2nd blade surface part 76 work as a cutting blade which cuts the skin, and can reduce the resistance applied to the skin at the time of puncture. Therefore, the pain felt by the patient or the like who is punctured with the puncture needle 71 can be reduced.

[Third blade surface portion 77]
The puncture needle 71 of the present embodiment includes a back blade that includes a first blade surface portion 75 and a second blade surface portion 76 in a side view (see FIG. 12B) when the distal end portion 73 is viewed in the major axis direction B. On the opposite side of the surface 74b, there is provided a front blade surface 74a that is inclined with respect to the central axis direction A and extends from the back blade surface 74b to the main body portion 72 side in the central axis direction A. As described above, the front blade surface 74 a of the present embodiment is configured by the third blade surface portion 77.

  As described above, the base end in the central axis direction A of the blade surface 74 of the present embodiment is configured by the third blade surface portion 77. In other words, the third blade surface portion 77 of the present embodiment extends in the central axis direction A to the proximal end side with respect to the first blade surface portion 75 and the second blade surface portion 76, and has a cylindrical tip portion 73. It is continuous with the outer peripheral surface.

  The third blade surface portion 77 is inclined so as to gradually approach the central axis O as it goes toward the needle tip 78 in the central axis direction A, and the inclination angle of the third blade surface portion 77 with respect to the central axis direction A is the center. It is larger than the inclination angle of the outer wall of the main body 72 with respect to the central axis direction A in the cross section including the entire axis O. In the present embodiment, the outer diameter of the main body 72 is uniform in the central axis direction A, and the outer wall of the main body 72 extends in the central axial direction A when viewed in a cross section including the entire central axis O. doing. Therefore, if the third blade surface portion 77 is inclined with respect to the central axis direction A, the inclination angle of the third blade surface portion 77 is larger than the inclination angle of the outer wall of the main body portion 72. However, when the main body 72 has a configuration in which the outer diameter gradually decreases or gradually increases toward the distal end portion 73 in the central axis direction A, the third blade surface portion 77 is only inclined with respect to the central axis direction A. Instead, it is configured to be inclined with respect to the outer wall of the main body 72 in a cross section including the entire central axis O.

  Here, FIG. 15 is a side view showing a puncture needle 71 ′ as a modification of the puncture needle 71 of the present embodiment. The puncture needle 71 ′ shown in FIG. 15 is different from the puncture needle 71 shown in FIGS. Specifically, the outer peripheral surface of the distal end portion 73 ′ of the puncture needle 71 ′ shown in FIG. 15 is longer in the long axis direction B (see FIG. 12A) as it goes toward the needle tip 78 ′ side in the central axis direction A. And a cylindrical shape in which the length in the minor axis direction C gradually decreases. Further, the central axis of the distal end portion 73 ′ substantially coincides with the central axis O of the main body portion 72 ′.

  Then, in the side view shown in FIG. 15, out of the outer peripheral surface of the tip portion 73 ′, the first blade surface portion (not shown) as the back blade surface 74 b ′ and the second blade surface portion 76 ′ are in the central axis direction A. At the position on the main body 72 ′ side and on the opposite side to the third blade surface portion 77 ′ as the front blade surface 74a ′, it approaches the center axis O as it goes toward the needle tip 78 ′ in the center axis direction A. A rear inclined portion 85b ′ that is inclined in this manner is formed.

  By providing such a back inclined portion 85b ', the puncture needle 71' during puncturing has a pressing force from the back side to the front side via the first blade surface portion (not shown) and the second blade surface portion 76 '. In addition, a pressing force is applied from the back side to the front side via the back inclined portion 85b ′. Therefore, compared with the puncture needle 71 of the present embodiment in which the outer peripheral surface on the opposite side of the front blade surface 74a extends in parallel with the central axis direction A, the straightness can be further improved. As shown in FIG. 15, the base end in the central axis direction A of the third blade surface portion 77 ′ as the front blade surface 74 a ′ is the center axis direction A in the side view of the outer peripheral surface of the distal end portion 73 ′. You may make it continue to the front inclination part 85a 'which inclines so that it may approach the central axis O as it goes to the needle point 78'. In such a case, as shown in FIG. 15, it is preferable to extend the back inclined portion 85b 'to the position facing the front inclined portion 85a' in the back surface of the tip portion 73 '.

[Cross-sectional shape of blade surface 74]
Returning to the description of the puncture needle 71 of the present embodiment again, the shape of the blade surface 74 of the present embodiment in a cross section orthogonal to the central axis direction A will be described below. 14 (a), (b), (c), (d), and (e) are respectively the XX sectional view, the XI-XI sectional view, the XII-XII sectional view, and the XIII-XIII sectional view in FIG. 12 (a). It is a figure and XIV-XIV sectional drawing.

  Specifically, FIG. 14A shows a cross section orthogonal to the central axis direction A at the position where the blade edge 79 is formed in the central axis direction A. FIG. As shown in FIG. 14A, each of the first blade surface portion 75 and the second blade surface portion 76 in the XX cross section of FIG. 12A is inclined at an acute angle θ10 with respect to the center plane X. . As shown in FIG. 14A, the third blade surface portion 77 in the XX section of FIG. 12A extends at an angle γ10 of about 90 degrees with respect to the center plane X. Further, as shown in FIG. 14A, the outer edges of the first blade surface portion 75 and the second blade surface portion 76 in the XX cross section of FIG. 12A form a cutting edge having an intersection angle τ10 of 60 degrees or less. ing.

  FIG. 14B is a base end side with respect to the blade edge 79 in the central axis direction A, and is orthogonal to the central axis direction A at the position where the first blade surface portion 75 and the second blade surface portion 76 are formed. A cross section is shown. As shown in FIG. 14B, each of the first blade surface portion 75 and the second blade surface portion 76 in the XI-XI cross section of FIG. 12A has an acute angle with respect to the center plane X, as in FIG. Is inclined at an angle θ10. As shown in FIG. 14B, the third blade surface portion 77 in the XI-XI cross section of FIG. 12A forms an angle γ10 of approximately 90 degrees with respect to the center plane X, as in FIG. It is extended. Further, as shown in FIG. 14B, the outer edges of the first blade surface portion 75 and the second blade surface portion 76 in the XI-XI cross section of FIG. 12A are cut edges having an intersection angle τ10 of 60 degrees or less. Forming. Note that the crossing angle τ10 in FIG. 14B is equal to the crossing angle τ10 in FIG.

  FIG. 14C shows a cross section orthogonal to the central axis direction A at the positions of the base ends of the outer edges of the first blade surface portion 75 and the second blade surface portion 76 in the central axis direction A. As shown in FIG. 14 (c), the first blade surface portion 75 and the second blade surface portion 76 in the XII-XII cross section of FIG. 12 (a) are respectively centered as in FIGS. 14 (a) and 14 (b). It is inclined with respect to the plane X at an acute angle θ10. As shown in FIG. 14C, the third blade surface portion 77 in the XII-XII cross section of FIG. 12A is approximately 90 with respect to the central plane X, as in FIGS. 14A and 14B. It extends at an angle γ10 of degrees. Further, as shown in FIG. 14C, the outer edges of the first blade surface portion 75 and the second blade surface portion 76 in the XII-XII cross section of FIG. Forming. Note that the intersection angle τ10 in FIG. 14C is equal to the intersection angle τ10 in FIGS. 14A and 14B.

  FIG. 14D shows a cross section orthogonal to the central axis direction A at the position closest to the needle tip 78 among the positions where the width of the tip 73 in the major axis direction B is maximum in the central axis direction A. Show. As shown in FIG. 14D, the first blade surface portion 75 and the second blade surface portion 76 do not exist in the XIII-XIII cross section of FIG. As shown in FIG. 14D, the third blade surface portion 77 in the XIII-XIII cross section of FIG. 12A is approximately 90 with respect to the central plane X, as in FIGS. 14A to 14C. It extends at an angle γ10 of degrees. As shown in FIG. 14 (d), the outer edge of the third blade surface portion 77 in the XIII-XIII cross section of FIG. 12 (a) has a large crossing angle τ13 (for example, an angle larger than 60 degrees) The blade is not formed.

  14E is a base end side in the central axis direction A with respect to the cross section of FIG. 14D, and the central axis direction A at the position where the third blade surface portion 77 is formed in the central axis direction A. FIG. The cross section orthogonal to is shown. As shown in FIG. 14E, the third blade surface portion 77 in the XIV-XIV cross section of FIG. 12A is approximately 90 with respect to the central plane X, as in FIGS. 14A to 14D. It extends at an angle γ10 of degrees. In addition, as shown in FIG.14 (e), the outer edge of the 3rd blade surface part 77 in the XIV-XIV cross section of Fig.12 (a) makes the crossing angle (tau) 14 larger than 90 degree | times, and forms the cutting edge. Absent.

  Thus, each of the first blade surface portion 75 and the second blade surface portion 76 extends linearly in a cross-sectional view (see FIGS. 14A to 14C) orthogonal to the central axis direction A. The angle θ with respect to the central plane X in the cross section orthogonal to the central axis direction A of each of the first blade surface portion 75 and the second blade surface portion 76 in the present embodiment is constant (θ10) regardless of the position in the central axis direction A. . Further, the third blade surface portion 77 extends on a straight line in a cross-sectional view orthogonal to the central axis direction A (see FIGS. 14A to 14E), and the third blade surface portion in the present embodiment. The angle γ with respect to the center plane X in a cross section orthogonal to the center axis direction A is constant regardless of the position in the center axis direction A (approximately 90 degrees in the present embodiment).

  Further, as shown in FIGS. 13 and 14 (a) to 14 (c), the outer edges of the first blade surface portion 75 and the second blade surface portion 76 of the present embodiment have the tip portion 73 in the central axis direction A. When viewed, the crossing angle τ extends from the outer periphery of the main body portion 72 to the outside and extends from the needle tip 78 to the outer side of the outer periphery of the main body portion 72, and the intersection angle τ is equal to or less than a predetermined angle (for example, 60 degrees). (See “τ10” in FIG. 14).

  The medical puncture needle according to the present invention is not limited to the specific configuration described in the above-described embodiment, and various modifications can be made without departing from the gist of the invention described in the claims. For example, puncture needles that combine the features of the above-described embodiments are also included in the technical scope of the present invention. For example, the front blade surface 54a reaching the boundary U in the puncture needle 51 of the second embodiment described above or the front blade surface 54a ′ straddling the boundary U ′ of the puncture needle 51 ′ shown in FIG. It can also be applied to the shape of the tip portion 3 having the blade surface forming portion 3a and the connecting portion 3b in the needle 1. In the case of the shape of the distal end portion 3 of the first embodiment, a large step is likely to be formed at the boundary between the blade surface forming portion 3a and the connecting portion 3b, which may cause an increase in puncture resistance during puncturing. By applying the front blade surface 54a of the second embodiment and the front blade surface 54a 'shown in FIG. 9, it is difficult to form a large step.

  In addition, each of the tip portions described in the above embodiments has an elliptical cross-sectional outer shape or a cross-sectional outer shape including an elliptic arc-shaped portion as a flat cross-sectional outer shape. The oval shape is not limited to an oval shape, and may be another oval shape different from an oval shape such as an egg shape or an oval shape.

  Furthermore, although the 1st blade surface part and 2nd blade surface part which were demonstrated by embodiment mentioned above are all comprised by the plane, it is good also as a 1st blade surface part and a 2nd blade surface part comprised by the curved surface. 16 is a view showing a puncture needle 91 as a modified example of the puncture needle 1 shown in FIGS. 1 to 4, and FIG. 16 (a) is a plan view of the front side in the vicinity of the distal end portion 93, and FIG. b) is a side view of the vicinity of the distal end portion 93.

  In the puncture needle 91 shown in FIG. 16, as can be seen from the side view of FIG. 16B, the angle of the second blade surface portion 96 in the cross section orthogonal to the central axis direction A changes according to the position in the central axis direction A. To do. Specifically, in FIG. 16B, at the position where the second blade surface portion 96 and the third blade surface portion 97 are continuous in the central axis direction A, only the outer edge of the second blade surface portion 96 is visible, but the central axis direction At the position where the blade edge 99 is formed in A, the second blade surface portion 96 can be visually recognized. That is, the second blade surface portion 96 is configured by a curved surface that extends to twist toward the needle tip 98 from a position continuous with the third blade surface portion 97 in the central axis direction A, such as a spiral surface. Yes. The first blade surface portion 95 is also configured by a curved surface extending so as to be twisted toward the needle tip 98 from a position continuous with the third blade surface portion 97 in the central axis direction A, similarly to the second blade surface portion 96. Has been. However, the direction in which the first blade surface portion 95 and the second blade surface portion 96 are twisted toward the needle tip 98 is opposite.

  More specifically, in the puncture needle 91 shown in FIG. 16, a cross section perpendicular to the central axis direction A as both the first blade surface portion 95 and the second blade surface portion 96 move toward the needle tip 98 in the central axis direction A. The angle θ with respect to the central plane X in FIG. If the first blade surface portion 95 and the second blade surface portion 96 are configured with such curved surfaces, a ridge line that can be pierced resistance between the first blade surface portion 95 and the second blade surface portion 96 and the third blade surface portion 97. It is possible to easily realize the blade surface 94 in which (junction) is not formed.

  The third blade surface portion 97 that is continuous with the first blade surface portion 95 and the second blade surface portion 96 on the main body portion 92 side is composed of only a convex curved surface, but only a plane that is inclined with respect to the central axis direction A. You may comprise by. Moreover, it is good also as a 3rd blade surface part containing a convex-shaped curved surface and the plane inclined with respect to the center axis direction A. FIG.

  17 is a view showing a puncture needle 111 as a modification of the puncture needle 71 shown in FIGS. 11 to 14, and FIG. 17 (a) is a plan view of the front side of the puncture needle 111. FIG. (B) is a side view of the puncture needle 111, and FIG. 17 (c) is a plan view of the back side of the puncture needle 111. The puncture needle 111 shown in FIG. 17 is different from the puncture needle 71 shown in FIGS. 11 to 14 in the configuration of the first blade surface portion and the second blade surface portion, but the other configurations are the same. Specifically, the first blade surface portion 75 and the second blade surface portion 76 of the puncture needle 71 shown in FIGS. 11 to 14 are configured by planes, whereas the first blade surface portion of the puncture needle 111 shown in FIG. 115 and the 2nd blade surface part 116 are comprised by the curved surface.

  Specifically, in the puncture needle 111 shown in FIG. 17, both the first blade surface portion 115 and the second blade surface portion 116 are in a cross section orthogonal to the central axis direction A as they approach the needle tip 118 side in the central axis direction A. It is composed of a curved surface whose angle θ with respect to the central plane X gradually increases. If the 1st blade surface part 115 and the 2nd blade surface part 116 are comprised by such a curved surface, compared with the case where it comprises by a plane, the length of the outer edge of the 1st blade surface part 115 and the 2nd blade surface part 116 will be longer. Can be secured. As a result, it is easy to ensure a longer length of the outer edges of the first blade surface portion 115 and the second blade surface portion 116 that serve as the cutting edge. The outer edges of the first blade surface portion 115 and the second blade surface portion 116 are portions formed by ridge lines where the first blade surface portion 115 and the second blade surface portion 116 and the third blade surface portion 117 intersect each other.

  Furthermore, the front blade surface described in the first embodiment and the second embodiment described above is composed of a first blade surface portion, a second blade surface portion, and a third blade surface portion that are configured as flat surfaces, but there are four or more flat surfaces. May be combined to form a front blade surface. 18 is a view showing a puncture needle 131 as a modification of the puncture needle 1 shown in FIGS. 1 to 4, and FIG. 18 (a) is a plan view of the front side in the vicinity of the distal end portion 133, and FIG. b) is a side view of the vicinity of the front end portion 133.

  A blade surface 134 is formed at the tip 133 of the puncture needle 131 shown in FIG. The blade surface 134 is composed only of the front blade surface 134a and does not have a back blade surface. The front blade surface 134a is formed by a first blade surface portion 135 and a second blade surface portion 136 that form a blade edge 139 having the needle tip 138 as one end by a ridge line that intersects with each other, and a plane that forms the base end of the front blade surface 134a. The configured third blade surface portion 137, at least one first connection blade surface portion 149a that connects the first blade surface portion 135 and the third blade surface portion 137, and the second blade surface portion 136 and the third blade surface portion 137 are connected. And at least one second connecting blade surface portion 149b.

  In the example shown in FIG. 18, four first connection blade surface portions 149a each formed by a plane are formed, and the first blade surface portion 135 and the third blade surface portion 137 are formed by the plurality of first connection blade surface portions 149a. They are connected without a large step. Similarly, in the example shown in FIG. 18, four second connection blade surface portions 149b configured by planes are formed, and the second blade surface portion 136 and the third blade surface portion are formed by the plurality of second connection blade surface portions 149b. It is connected with 137 without a large step.

  In addition, you may comprise a part or all of the 1st connection blade surface part 149a shown in FIG. 18 by a curved surface. Moreover, you may comprise a part or all of the 2nd connection blade surface part 149b shown in FIG. 18 by a curved surface. Furthermore, you may comprise the 3rd blade surface part 137 shown in FIG. 18 by a convex-shaped curved surface.

  Here, in the example shown in FIG. 18, the first blade surface portion 135 and the second blade surface portion 136 are located more than the intermediate position H in the central axis direction A of the main body portion 132 of the blade surface region T where the blade surface 134 is formed. It extends to the base end side.

  The present invention relates to a medical puncture needle.

1, 51, 51 ′, 51 ″, 71, 71 ′, 91, 111, 131: Puncture needle 2, 52, 52 ′, 52 ″, 72, 72 ′, 92, 132: Main body 3, 53, 53 ′, 53 ″, 73, 73 ′, 93, 133: tip portion 3a, 73a: blade surface forming portion 3b, 73b: connecting portions 4, 54, 74, 94, 134: blade surfaces 4a, 54a, 54a ′ 54a ″, 74a, 74a ′, 134a: Front blade surface 74b, 74b ′: Back blade surface 5, 55, 75, 95, 115, 135: First blade surface portion 6, 56, 76, 76 ′, 96, 116, 136: second blade surface portion 7, 57, 57 ′, 57 ″, 77, 77 ′, 97, 117, 137: third blade surface portion 8, 58, 58 ′, 58 ″, 78, 78 ′, 98, 118, 138: Needle tips 9, 59, 79, 99, 139: Blade edges 10, 60, 80: Hollow portions 15, 85 : Tapered portions 15a, 85a: Front inclined portions 15b, 85b: Back inclined portions 16, 66, 86: Tapered portions 16a, 86a: First side inclined portions 16b, 86b: Second side inclined portions 65a ″, 85a ′: Front inclined portions 65b, 85b ': Back inclined portion 149a: First connecting blade surface portion 149b: Second connecting blade surface portion A: Center axis direction B: Long axis direction C: Short axis direction H: Intermediate position O of the blade surface region: Central axis P of main body part: Tangential inclination angle R1: Long axis R2: Short axis S1: Maximum width of tip part in front view S2: Maximum width of tip part in side view T: Blade surface regions U, U ′, U ′ ': Boundary X between the main body part and the tip part: Central plane BL: Periphery α of the main body part α: Cutting edge angle τ: Crossing angle θ: First blade surface part and second with respect to the central plane in a cross section orthogonal to the central axis direction Blade surface angle γ: In the cross section perpendicular to the central axis direction The angle of the third blade face relative to the center plane

Claims (12)

A main body having a substantially circular outer shape in cross section perpendicular to the central axis direction;
A tip portion that is continuous with one end of the main body portion and has a flat outer shape with a cross section orthogonal to the central axis direction;
The tip portion includes a first blade surface portion and a second blade surface portion that form a blade edge having a needle tip as one end by a ridge line intersecting each other,
The needle tip is a medical puncture needle positioned inside the outer periphery of the main body when viewed in the direction of the central axis. The longitudinal direction of the tip portion in the cross section orthogonal to the central axis direction is the long axis direction of the tip portion, and the short direction of the tip portion in the cross section orthogonal to the central axis direction is the short axis direction of the tip portion. If
When the tip portion is viewed in the central axis direction, both ends of the tip portion in the major axis direction are located outside the outer periphery of the main body portion, and both ends of the tip portion in the minor axis direction are the main body. The medical puncture needle according to claim 1, wherein the medical puncture needle is located inside the outer periphery of the portion.   In a side view of the tip portion viewed in the major axis direction, the outer peripheral surface of the tip portion located on the opposite side of the front blade surface including the first blade surface portion and the second blade surface portion is The medical puncture needle according to claim 2, wherein a back inclined portion that is inclined so as to approach the central axis as it goes toward the needle tip in the central axis direction is formed. In a side view when the tip portion is viewed facing the major axis direction, the tip is inclined with respect to the central axis direction on the opposite side of the back blade surface including the first blade surface portion and the second blade surface portion, A front blade surface extending from the back blade surface to the main body side in the central axis direction,
In the side view, the outer peripheral surface of the tip portion located on the main body portion side in the central axis direction with respect to the back blade surface and on the opposite side to the front blade surface is in the central axis direction. The medical puncture needle according to claim 2, wherein a back inclined portion that is inclined so as to approach the central axis line toward the needle tip is formed.   The front blade surface extends from the needle tip to the boundary between the tip portion and the main body portion, or extends from the needle tip to the main body portion across the boundary between the tip portion and the main body portion. The medical puncture needle according to claim 3 or 4. The front blade surface extends only within the tip,
One end on the main body side in the central axis direction of the front blade surface is inclined so as to approach the central axis as it approaches the needle tip in the central axis direction in the side view among the outer peripheral surface of the tip portion. The medical puncture needle according to claim 3 or 4, which is continuous with the front inclined portion.   The medical puncture needle according to claim 6, wherein the back inclined portion extends to a position facing the front inclined portion in the side view. The tip portion is an elliptical cylindrical blade surface forming portion on which a blade surface including the first blade surface portion and the second blade surface portion is formed, and a cylindrical shape that connects the blade surface forming portion and the main body portion. A connecting portion,
On the outer peripheral surface of the connecting portion, in a side view when the distal end is viewed in the major axis direction, each of the distal ends approaches the central axis as it approaches the needle tip in the central axis direction. The medical puncture needle according to claim 2, wherein a front inclined portion and a back inclined portion are formed.   The outer peripheral surface of the tip has a tapered portion whose width gradually increases toward the needle tip in the central axis direction in a front view when the tip is viewed facing the short axis direction. Item 9. A medical puncture needle according to any one of Items 2 to 8.   The outer edge of at least one blade surface portion of the first blade surface portion and the second blade surface portion extends to the outside of the outer periphery of the main body portion when the tip portion is viewed in the central axis direction. The medical puncture needle according to any one of claims 2 to 9.   The outer edge of the at least one blade surface portion reaches a position where the width of the tip portion is maximized in the major axis direction from the needle tip when the tip portion is viewed in the central axis direction. Item 11. A medical puncture needle according to Item 10.   The medical puncture needle according to any one of claims 1 to 11, wherein a central axis of the tip portion substantially coincides with the central axis of the main body portion.

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