Method for manufacturing puncture needle

Abstract

Provided is a manufacturing method suitable for manufacturing a puncture needle having, when viewed along an axial direction of a cylindrical body part, a blade surface part that has a half-angle shape part having a shape along a V-shape protruding downward and an arc shape part having a shape along an arc shape protruding upward. This method for manufacturing a puncture needle includes performing a first molding step, in which a metal material formed in a cylindrical body part is sandwiched between a first mold and a second mold to mold the half-angle shape part.

Description

Method for manufacturing a puncture needle

[0001] The present disclosure relates to a method for manufacturing a puncture needle.

[0002] Patent Document 1 discloses a metal tubular body and a method for manufacturing the same. In this method for manufacturing the metal tubular body, a thin metal plate having a developed shape of the tubular body is press-worked to form the tubular body.

[0003] Patent Document 2 discloses a puncture needle. This puncture needle includes a rod-shaped main body portion, a blade portion formed at the tip of the main body portion and having a front-side blade surface that extends inclined with respect to the axis of the main body portion, a planar first back surface portion formed on the back side of the front-side blade surface at the tip of the main body portion, and a planar second back surface portion formed on the back side of the front-side blade surface at the tip of the main body portion. The first back surface portion and the second back surface portion are parallel to the axis or approach each other toward the needle tip and do not intersect each other at the needle tip. In this puncture needle, the main body portion is, for example, cylindrical. The lower end portion of the main body portion has a V-shaped cross section formed by a first plate-like portion and a second plate-like portion that intersects the axis of the main body portion. The upper ends of the first plate-like portion and the second plate-like portion are continuous with an arcuate portion having an arcuate cross section that intersects the axis of the main body portion. That is, when viewed along the axial direction of the cylindrical main body portion, this puncture needle has a half-angle-shaped portion along a V-shaped shape in which the blade portion bulges downward and an arcuate-shaped portion along an arcuate shape in which the blade portion bulges upward. The main body portion is formed, for example, by forming processes such as press-working, drawing with a die, and bending such as roll-working of a cylindrical member. This puncture needle is said to have a sharp cutting edge and to be able to ensure a sufficient length of the cutting edge.

[0004] Japanese Patent Application Laid-Open No. 2003-136142 International Publication No. 2023 / 176645

[0005] As disclosed in Patent Documents 1 and 2, puncture needles may be formed by pressing or bending. However, a manufacturing method suitable for producing a puncture needle, such as that disclosed in Patent Document 2, which has a half-angled section that follows a V-shape with the blade surface convex downwards and an arc-shaped section that follows an arc shape with the blade surface convex upwards when viewed along the axial direction of the cylindrical body, is not specifically disclosed. Therefore, there is a need to provide a manufacturing method suitable for producing such a puncture needle.

[0006] This disclosure has been made in view of the above circumstances, and its purpose is to provide a manufacturing method suitable for producing a puncture needle in which, when viewed along the axial direction of the cylindrical body, the cutting surface portion has a half-angled portion that follows a V-shape that is convex downwards and an arc-shaped portion that follows an arc-shaped shape that is convex upwards.

[0007] A method for manufacturing a puncture needle according to the present disclosure to achieve the above objective is a method for manufacturing a puncture needle comprising: a cylindrical body portion made of metal; a blade surface portion formed at the tip of the body portion in the axial direction, having a front blade surface that is inclined with respect to the axial direction and extends from the base end side to the tip side of the body portion in the axial direction, wherein the blade surface portion has a half-angled shape that follows a V-shape that is convex downward in the vertical direction when the blade surface portion is viewed from the tip side of the body portion along the axial direction with the back side of the front blade surface facing downward and the front side of the front blade surface facing upward, and an arc-shaped portion that follows an arc-shaped shape that is convex upward in the vertical direction, the method for manufacturing a puncture needle comprising: a first molding step of sandwiching a metal material to be formed in the body portion between a first mold and a second mold to form the half-angled shape portion.

[0008] In the method for manufacturing a puncture needle according to the present disclosure, in the first molding step, the tip of the metal cylindrical member formed on the main body may be sandwiched between the first mold and the second mold from the outside of the cylindrical member to form the half-angled portion.

[0009] In the method for manufacturing a puncture needle according to the present disclosure, in the first molding step, the tip of the cylindrical member is sandwiched between the first mold and the second mold from above and below, the mold surface of the first mold may be a concave shape following an arc that is convex upwards, and the mold surface of the second mold may be a concave shape following a V-shape that is convex downwards.

[0010] In the method for manufacturing a puncture needle according to this disclosure, the cylindrical member may have an elliptical cross-sectional shape when viewed along the axial direction.

[0011] In the method for manufacturing a puncture needle according to the present disclosure, in the first molding step, the tip of the cylindrical member is sandwiched between the first mold and the second mold from left and right directions perpendicular to the axial direction and the vertical direction, and the mold surfaces of the first mold and the second mold may have a concave shape that follows an arc at the upper end and a flat shape at the lower end.

[0012] In the method for manufacturing a puncture needle according to this disclosure, a front blade surface forming step may be performed after the first molding step to form the front blade surface.

[0013] In the method for manufacturing a puncture needle according to the present disclosure, the first molding step may involve molding the half-angled portion within the range in the axial direction where the front cutting surface is formed.

[0014] In the method for manufacturing a puncture needle according to the present disclosure, in the first molding step, when sandwiching the cylindrical member between the first mold and the second mold, the speed at which the upper end of the first mold and the upper end of the second mold move toward each other may be greater than the speed at which the lower end of the first mold and the lower end of the second mold move toward each other.

[0015] In the method for manufacturing a puncture needle according to the present disclosure, in the first molding step, when sandwiching the cylindrical member between the first mold and the second mold, a pivot axis may be positioned at the lower end of the first mold and the second mold and rotated to sandwich the cylindrical member between the first mold and the second mold.

[0016] In the method for manufacturing a puncture needle according to the present disclosure, in the first molding step, when sandwiching the cylindrical member between the first mold and the second mold, the speed at which the lower end of the first mold and the lower end of the second mold move toward each other may be greater than the speed at which the upper end of the first mold and the upper end of the second mold move toward each other.

[0017] In the method for manufacturing a puncture needle according to the present disclosure, in the first molding step, when sandwiching the cylindrical member between the first mold and the second mold, a pivot axis may be positioned at the upper end of the first mold and the second mold and rotated to sandwich the cylindrical member between the first mold and the second mold.

[0018] In the method for manufacturing a puncture needle according to the present disclosure, a front blade surface forming step is performed before the first molding step to form the front blade surface, and in the first molding step, the first mold may bias the inner circumferential surface of the cylinder of the main body portion at the blade surface portion to form the half-angled shape portion.

[0019] In the method for manufacturing a puncture needle according to this disclosure, the mold surface of the first mold may be a convex shape that follows a V-shape that is convex downwards.

[0020] In the method for manufacturing a puncture needle according to the present disclosure, in the first molding step, the lower end of the main body portion at the blade surface portion is supported by the second mold, and the mold surface of the second mold may be a concave shape that follows a V-shape that is convex downwards.

[0021] In the method for manufacturing a puncture needle according to the present disclosure, in the first molding step, the plate surface of the metal plate-shaped member formed on the main body may be sandwiched between the first mold and the second mold to form the half-angled portion.

[0022] In the method for manufacturing a puncture needle according to the present disclosure, after the first molding step, a cylindrical forming step may be performed to form the arc-shaped portion of the plate-shaped member by curving one end of the plate-shaped member in the left-right direction perpendicular to the axial direction and the vertical direction so that it is close to the other end.

[0023] In the method for manufacturing a puncture needle according to the present disclosure, the mold surface of the first mold may be a convex shape following a V-shape that is convex downwards, and the mold surface of the second mold may be a concave shape following a V-shape that is convex downwards.

[0024] In the method for manufacturing a puncture needle according to this disclosure, a front blade surface forming step may be performed after the tube forming step to form the front blade surface.

[0025] According to this disclosure, a manufacturing method suitable for producing a puncture needle is provided, in which, when viewed along the axial direction of the cylindrical body, the cutting surface portion has a half-angled portion that follows a V-shape that is convex downwards and an arc-shaped portion that follows an arc-shaped shape that is convex upwards.

[0026] This is a perspective view of a puncture needle manufactured by the puncture needle manufacturing method according to this embodiment. This is a front view of a puncture needle manufactured by the puncture needle manufacturing method according to this embodiment. This is a perspective view of a cylindrical member. This is an explanatory diagram of the first molding process according to the first embodiment. This is an explanatory diagram of the first molding process according to the first embodiment. This is an explanatory diagram of the first molding process according to the first embodiment. This is an explanatory diagram of the first molding process according to the first embodiment. This is a front view of the cylindrical member immediately after the first molding process of the first embodiment. This is a side view of the cylindrical member immediately after the first molding process of the first embodiment. This is an explanatory diagram of the front blade surface formation process according to the first embodiment. This is a right side view of the puncture needle immediately after the front blade surface formation process of the first embodiment. This is an explanatory diagram of a modified example of the first embodiment. This is an explanatory diagram of the first molding process according to the second embodiment. This is an explanatory diagram of the first molding process according to the second embodiment. This is a front view of the cylindrical member immediately after the first molding process of the second embodiment. This is a side view of the cylindrical member immediately after the first molding process of the second embodiment. This is an explanatory diagram of the front blade surface formation process according to the second embodiment. This is an explanatory diagram of modified example 1 of the second embodiment. This is an explanatory diagram of modified example 2 of the second embodiment. This is an explanatory diagram of the front blade surface formation process of the third embodiment. This is a side view of the cylindrical member immediately after the front blade surface formation process of the third embodiment. This is a front view of the cylindrical member immediately after the front blade surface formation process of the third embodiment. This is an explanatory diagram of the first molding process according to the third embodiment. This is an explanatory diagram of the first molding process according to the third embodiment. This is an explanatory diagram of the first molding process according to the third embodiment. This is an explanatory diagram of the first molding process according to the fourth embodiment. This is an explanatory diagram of the first molding process according to the fourth embodiment. This is an explanatory diagram of the cylindrical formation process according to the fourth embodiment. This is an explanatory diagram of the front blade surface formation process of the fourth embodiment. This is a perspective view of another puncture needle manufactured by the puncture needle manufacturing method according to this embodiment.

[0027] A method for manufacturing a puncture needle according to an embodiment of this disclosure will be described with reference to the drawings.

[0028] First, an example of a puncture needle that can be manufactured by the puncture needle manufacturing method according to this embodiment will be described.

[0029] Figures 1 and 2 show an example of a puncture needle 100 that can be manufactured by the puncture needle manufacturing method according to this embodiment.

[0030] The puncture needle 100 comprises a cylindrical body portion 1 made of metal, and a blade portion 2 formed at the tip of the body portion 1 in the axial direction, having a front blade surface 20 that is inclined with respect to the axial direction and extends from the base end side to the tip end side in the axial direction of the body portion 1.

[0031] The blade surface portion 2 has a half-angled shape portion 12 that follows the shape of the letter V, which is convex downwards in the vertical direction when the blade surface portion 2 is viewed along the axial direction from the tip side of the main body portion 1, with the back side of the front blade surface 20 facing downwards and the front side (blade surface side) of the front blade surface 20 facing upwards, and an arc-shaped portion 11 that follows the shape of an arc, which is convex upwards in the vertical direction.

[0032] Figure 1 is a perspective view of the tip of the puncture needle 100, seen from diagonally above. Figure 2 is a view of the puncture needle 100 from the tip side, that is, a view of the blade surface 2 along the axial direction from the tip side of the main body 1. Hereafter, the view of the blade surface 2 along the axial direction from the tip side of the main body 1 will be referred to as a front view, and the figure seen in a front view will be referred to as a front view.

[0033] In Figure 1, the orientation of the tip end of the main body 1 in the axial direction (hereinafter sometimes simply referred to as the axial direction) is indicated by the symbol Z1, and the orientation of the base end is indicated by the symbol Z2. Also, the symbol Y1 indicates the up direction in the vertical direction, and the symbol Y2 indicates the down direction in the vertical direction. In this embodiment, the vertical direction is perpendicular to the axial direction.

[0034] In this embodiment, the direction perpendicular to the axial and vertical directions is referred to as the left-right direction. In Figure 1, the reference numeral X1 indicates the left in the left-right direction, and the reference numeral X2 indicates the right in the left-right direction.

[0035] The axial, vertical, and horizontal directions described above will be common to the following explanation.

[0036] As shown in Figures 1 and 2, the main body 1 is formed in a cylindrical shape. The main body 1 has a cutting surface 2 at the tip end in the axial direction of the cylinder, and a cylindrical base end 10 at the base end of the cylinder. The base end 10 may be circular in shape when viewed from the front, that is, its surface along the circumferential direction (outer surface 10a) may be circular. The main body 1 has an opening 15 at its tip that communicates with the internal space of the cylinder.

[0037] The blade surface portion 2 has a front blade surface 20 that extends at least from the base end to the tip end. In a front view, the upper end of the front blade surface 20 is located towards the base end, and the lower end is located towards the tip end. The front blade surface 20 may, for example, be formed in a planar shape, but is not limited to this.

[0038] The blade surface portion 2 may have blade surfaces other than the front blade surface 20, as will be described later.

[0039] The half-angled portion 12 has a shape that follows a V-shape, convex downwards when viewed from the front. The half-angled portion 12 extends along the axial direction. The lower end of the V-shape of the half-angled portion 12, that is, the top 12c of the V-shape on the radially outer side of the main body portion 1 (hereinafter simply referred to as the outer side), extends along the axial direction. The top 12c may be chamfered. The left and right outer surfaces of the half-angled portion 12 in a front view may be formed in a planar shape. In Figure 2, the left and right outer surfaces of the half-angled portion 12 are shown as planar portions 12a and 12b. The planar portions 12a and 12b may be formed only on the blade surface portion 2, or they may be formed to extend from the blade surface portion 2 to the base end portion 10. Figure 2 shows the case where the planar portions 12a and 12b are formed only on the blade surface portion 2.

[0040] As shown in Figures 1 and 2, a stepped portion 13 may be formed between the outer circumferential surface 10a of the base end portion 10 and the half-angled portion 12. The stepped portion 13 may, for example, have a surface portion facing the tip side. In this embodiment, an example is shown where the boundary portion between the flat portions 12a, 12b of the half-angled portion 12 and the outer circumferential surface 10a of the base end portion 10 is a stepped surface 13a, 13b which is a surface facing the tip side.

[0041] The angle at which the planar portions 12a and 12b intersect is, for example, 70° to 110°.

[0042] In a front view, the arc-shaped portion 11 has a shape along an arc that bulges upward. The arc-shaped portion 11 extends along the axial direction.

[0043] Next, an outline of the manufacturing method of the puncture needle according to the present embodiment will be described.

[0044] The manufacturing method of the puncture needle according to the present embodiment includes a first molding step of sandwiching a metal material formed in the main body portion 1 between a first mold and a second mold to mold the half-angle-shaped portion 12.

[0045] When the manufacturing method of the puncture needle according to the present embodiment is viewed along the axial direction of the cylindrical main body portion 1 as described above, the cutting edge portion 2 has a half-angle-shaped portion 12 with a shape along a V-shaped that bulges downward and an arc-shaped portion 11 with a shape along an arc that bulges upward, and is suitable for manufacturing the puncture needle 100.

[0046] In the manufacturing method of the puncture needle according to the present embodiment, a puncture needle 100 having a half-angle-shaped portion 12 and an arc-shaped portion 11 can be manufactured regardless of the diameter of the cylinder of the main body portion 1. In particular, a puncture needle 100 with a small diameter of the cylinder of the main body portion 1, for example, 0.26 mm or less, can also be manufactured.

[0047] Hereinafter, the manufacturing method of the puncture needle according to the present embodiment will be described in detail.

[0048] (First Embodiment) FIG. 3 shows a perspective view of a metal cylindrical member 3 formed in the main body portion 1 (see FIG. 1). The cylindrical member 3 has, for example, a circular outer peripheral surface in a front view. The cylindrical member 3 has an opening 35 at its tip that communicates with the internal space of the cylinder. FIGS. 4 to 7 show the molding process of the half-angle-shaped portion 12 (see FIG. 2) in the first molding step of the manufacturing method of the puncture needle according to the present embodiment in this order.

[0049] In the manufacturing method of the puncture needle according to this embodiment, in the first molding step, the tip portion 3a of the metal cylindrical member 3 formed on the main body portion 1 (see Figure 1), as shown in Figure 3, may be sandwiched between the first mold 4 and the second mold 5 from the outside of the cylindrical member 3, as shown in Figure 4, to form the half-angled portion 12 (see Figure 2) (see Figures 5 to 7). Figures 4 to 7 show the cylindrical member 3, the first mold 4 and the second mold 5 in a front view during the first molding step. Here, the outside of the cylindrical member 3 refers to the outside of the cylindrical member 3 in the radial direction of the cylinder. Hereafter, the outside of the cylindrical member 3 in the radial direction of the cylinder will be simply referred to as the outside, and the inside of the cylindrical member 3 in the radial direction of the cylinder will be simply referred to as the inside.

[0050] The axial direction of the cylindrical member 3 is assumed to overlap with the axial direction of the main body 1 (see Figures 1 and 2), and the vertical and horizontal directions of the cylindrical member 3 are the same as those described for Figure 1.

[0051] In the first molding process, the tip of the cylindrical member 3 may be sandwiched between the first mold 4 and the second mold 5 from above and below to form the half-angled portion 12 (see Figures 1 and 2). At this time, the arc-shaped portion 11 (see Figures 1 and 2) may also be formed.

[0052] In the first molding process, when the tip 3a of the cylindrical member 3 is sandwiched between the first mold 4 and the second mold 5 from above and below to form the half-angled portion 12 (see Figures 1 and 2), the mold surface 41 of the first mold 4 is a concave shape that follows an arc that is convex upwards. The mold surface 51 of the second mold 5 is a concave shape that follows a V-shape that is convex downwards. It is sufficient for the mold surface 51 to extend axially to correspond to the area where the half-angled portion 12 is formed.

[0053] By using the first mold 4 and the second mold 5 as described above, in the first molding process, after the tip 3a of the cylindrical member 3 is sandwiched between the first mold 4 and the second mold 5 from above and below (see Figure 4), as the first mold 4 and the second mold 5 are brought closer together, the cylindrical member 3 deforms into an elliptical shape, for example, with the vertical direction being the longitudinal direction (see Figure 5), and then the lower end of the tip 3a of the cylindrical member 3 deforms along the mold surface 51 (see Figure 6), and the half-angled portion 12 (see Figure 7) is formed.

[0054] Furthermore, in the first molding process, after the tip 3a of the cylindrical member 3 is sandwiched between the first mold 4 and the second mold 5 from above and below (see Figure 4), if the first mold 4 and the second mold 5 are brought even closer together, the cylindrical member 3 deforms into an elliptical shape, for example, with the vertical direction being the longitudinal direction (see Figure 5), and then the upper end of the tip 3a of the cylindrical member 3 deforms along the mold surface 41 (see Figure 6), forming the arc-shaped portion 11 (see Figure 7). Alternatively, after the tip 3a of the cylindrical member 3 is sandwiched between the first mold 4 and the second mold 5 (see Figure 4), the upper end of the tip 3a remains as the arc-shaped portion 11 while maintaining the arc shape of the outer surface (see Figure 7).

[0055] In the first molding process, the half-angled portion 12 may be molded within the range in which the front cutting surface 20 (see Figure 1) is formed in the axial direction, or it may be formed to extend to the base end portion 10 (see Figure 1) of the puncture needle 100. In the following description, the case in which the half-angled portion 12 is formed only on the cutting surface portion 2 (see Figure 1) of the puncture needle 100 will be described as an example.

[0056] After the arc-shaped portion 11 and the half-angle-shaped portion 12 are formed, the cylindrical member 3 is removed from the first mold 4 and the second mold 5. As shown in Figures 8 and 9, the cylindrical member 3 with the arc-shaped portion 11 and the half-angle-shaped portion 12 formed has the arc-shaped portion 11 and the half-angle-shaped portion 12 formed at the tip portion 3a, and for example, the base end side has a cylindrical base end portion 30 with a circular outer surface. Here, the base end portion 30 is the part that becomes the base end portion 10 of the puncture needle 100 shown in Figures 1 and 2. Figure 8 is a front view of the cylindrical member 3 immediately after the first molding process, i.e., after the arc-shaped portion 11 and the half-angle-shaped portion 12 have been formed. Figure 9 is a right side view of the cylindrical member 3 immediately after the first molding process, i.e., after the arc-shaped portion 11 and the half-angle-shaped portion 12 have been formed, viewed from the right side along the left-right direction.

[0057] After the first molding process, that is, after the arc-shaped portion 11 and the half-angle-shaped portion 12 are molded on the tip portion 3a of the cylindrical member 3, a front blade surface forming process may be performed to form the front blade surface 20 (see Figure 1). In the front blade surface forming process, the tip side of the tip portion 3a of the cylindrical member 3 (see Figure 9) with the arc-shaped portion 11 and the half-angle-shaped portion 12 molded is cut in a direction that intersects the axial direction (see Figure 10), and as shown in Figure 11, the front blade surface 20 is formed to obtain the puncture needle 100 according to this embodiment. Specifically, as shown in Figure 10, a blade surface overlapping with the axially intersecting cut surface C may be formed from the upper end slightly closer to the base end than the tip of the cylindrical member 3 in the axial direction toward the lower end on the tip side of the half-angle-shaped portion 12, and this may be the front blade surface 20. That is, the portion of the cylindrical member 3 closer to the tip than the cut surface C is cut off as a piece 39.

[0058] Figure 10 is an explanatory diagram of the front blade surface formation process of this embodiment, showing the cylindrical member 3 viewed from the right side along the left-right direction during the front blade surface formation process. Figure 11 is a right side view of the puncture needle 100 immediately after the front blade surface formation process.

[0059] In this embodiment, an example is shown in which the upper end of the cylindrical member 3, slightly closer to the base end than the tip (the upper end of the arc-shaped portion 11), is used to form a cutting surface 20 that overlaps with the axially intersecting cutting surface C, starting from the same position as the base end of the half-angle-shaped portion 12 in the axial direction and extending toward the lower end of the half-angle-shaped portion 12 on the tip side.

[0060] In this way, a puncture needle 100 as shown in Figures 1 and 2 can be obtained through the first molding process and the front blade surface formation process. If the puncture needle 100 has blade surfaces other than the front blade surface 20, in addition to the first molding process and the front blade surface formation process, a further step of forming blade surfaces other than the front blade surface 20 may be performed.

[0061] If, after the first molding process, burrs are formed on the left and right sides of the cylindrical member 3 shown in Figure 7, specifically on the parts corresponding to the boundary between the mold surface 41 and the mold surface 51, the burrs may be removed in any step after the first molding process.

[0062] In this embodiment, as described above and shown in Figure 4, the mold surface 41 of the first mold 4 is a concave shape that follows an arc convex upward, and the mold surface 51 of the second mold 5 is a concave shape that follows a V-shape convex downward. However, it is preferable that the width of the mold surface 41 in the left-right direction is wider than the width of the mold surface 51 in the left-right direction. This makes it possible to suppress the formation of burrs on the left and right sides of the tip portion 3a of the cylindrical member 3, in the portions corresponding to the boundary between the mold surface 41 and the mold surface 51.

[0063] In the first mold 4, it is preferable that both ends of the recess 40 in the left-right direction of the mold surface 41 are convex portions 42, 42 that are convex downwards. This enhances the effect of suppressing the formation of burrs on the left and right sides of the tip portion 3a of the cylindrical member 3, as described above.

[0064] Preferably, the apex (lower tip) of the protrusion 42 has a rounded shape, such as being chamfered with an R-chamfer. This improves the durability of the protrusion 42. For example, it reduces the risk of damaging the protrusion 42 by bumping it when handling the first mold 4.

[0065] When forming the arc-shaped portion 11 (see Figure 2) by sandwiching the tip portion 3a of the cylindrical member 3 between the first mold 4 and the second mold 5, it is preferable that the convex portions 42, 42 are positioned so as to fit inside the recess 50 on which the mold surface 51 is formed.

[0066] (Modification of the First Embodiment) In the description of the first embodiment above, the cylindrical member 3 was described using the example of a cylindrical outer surface that is circular when viewed from the front. However, the cylindrical member 3 may also have an elliptical outer surface when viewed from the front. In this case, in the first molding process, as shown in Figure 12, the elliptical cylindrical member 3A, which is a cylindrical member 3 with an elliptical outer surface when viewed from the front, is sandwiched between the first mold 4 and the second mold 5 with the longitudinal direction of its ellipse aligned in the vertical direction, and the arc-shaped portion 11 and the half-angled portion 12 are molded in the same manner as shown in Figure 7. Using an elliptical cylindrical member 3A as shown in Figure 12 may reduce the amount of deformation of the cylindrical member 3A in the first molding process. Furthermore, this may improve the molding accuracy of the half-angled portion 12 shown in Figure 7 and other figures, and improve the efficiency of the molding work of the half-angled portion 12.

[0067] Figure 12 shows the cylindrical member 3 and other components of this modified example in a front view during the first molding process.

[0068] (Second Embodiment) In the first embodiment described above, as shown in Figures 4 to 7, in the first molding step, the tip portion 3a of the cylindrical member 3 may be sandwiched from the outside of the cylindrical member 3 by the first mold 4 and the second mold 5 from the top and bottom directions to form the half-angled portion 12 (see Figures 1 and 2). The second embodiment differs from the first embodiment in that, in the first molding step, as shown in Figures 13 and 14, the tip portion 3a of the cylindrical member 3 may be sandwiched from the outside of the cylindrical member 3 by the first mold 6 and the second mold 7 from the left and right directions to form the half-angled portion 12, but otherwise it is generally the same as the first embodiment.

[0069] Figures 13 and 14 show the cylindrical member 3, the first mold 6, and the second mold 7 in a front view during the first molding process of this modified example.

[0070] In the first molding process, when forming a half-angled portion 12 by sandwiching the tip portion 3a of the cylindrical member 3 between the first mold 6 and the second mold 7 from the left and right directions, for example, the first mold 6 and the second mold 7 may be moved in a direction that brings them closer to each other along the same straight line so that the tip portion 3a of the cylindrical member 3 is sandwiched between the first mold 6 and the second mold 7. Hereinafter, the movement of the first mold 6 and the second mold 7 toward each other may be referred to as the first mold 6 and the second mold 7 closing.

[0071] In the first molding process, when the tip 3a of the cylindrical member 3 is sandwiched between the first mold 6 and the second mold 7 from the left and right directions to form the half-angled portion 12, the mold surface 61 of the first mold 6 is concave, recessed to the left. The mold surface 71 of the second mold 7 is concave, recessed to the right.

[0072] Furthermore, the mold surfaces 61 and 71 of the first mold 6 and the second mold 7 are concave in an arc shape at the upper end and flat at the lower end. For example, the mold surfaces 61 and 71 are symmetrical with respect to a plane parallel to the axial direction and the vertical direction.

[0073] In Figure 13, the concave portion of the mold surface 61 that follows the arc shape at the upper end is shown as the concave mold portion 62. The planar portion of the mold surface 61 that follows the arc shape at the lower end is shown as the planar mold portion 63.

[0074] Similarly, in Figure 13, the concave portion of the mold surface 71 that follows the arc shape at the upper end is shown as the concave mold portion 72. The planar portion of the mold surface 71 that follows the arc shape at the lower end is shown as the planar mold portion 73.

[0075] By using the first mold 6 and the second mold 7 as described above, as shown in Figure 14, the first mold 6 and the second mold 7 can be closed, and in the first molding process, the tip portion 3a of the cylindrical member 3 can be sandwiched between the first mold 6 and the second mold 7 from the left and right directions to form the half-angled portion 12 (see Figure 7). At this time, the arc-shaped portion 11 is molded at the same time, or the upper end of the tip portion 3a remains as the arc-shaped portion 11 while maintaining the arc shape of the outer surface.

[0076] In this embodiment, when the first mold 6 and the second mold 7 are closed, the concave mold portions 62 and 72 may form a single arc-shaped surface when viewed from the front. Also, the flat mold portions 63 and 73 may form a V-shape when viewed from the front.

[0077] After the first molding process, that is, after the arc-shaped portion 11 and the half-angle-shaped portion 12 are molded on the tip portion 3a of the cylindrical member 3, the puncture needle 100 can be obtained by going through a front blade surface forming process to form the front blade surface 20 (see Figure 1), similar to the first embodiment.

[0078] Furthermore, if burrs are formed after the first molding process on the portion that will become the main body 1 (see Figures 1 and 2), that is, on the upper and lower side surfaces of the tip portion 3a of the cylindrical member 3 shown in Figure 14, on the portion corresponding to the boundary between the mold surface 61 and the mold surface 71, the burrs may be removed in any step after the first molding process.

[0079] After the first molding process, if a burr 38 is formed on the upper side surface of the tip portion 3a of the cylindrical member 3, as shown in Figures 15 and 16, in the manufacturing method of the puncture needle according to this embodiment, when the front blade surface 20 (see Figure 1) is formed in the front blade surface formation process as shown in Figure 17, some or all of the burr 38 is removed together with the cut piece 39 that was cut to form the front blade surface 20.

[0080] Figure 15 is a front view of the cylindrical member 3 immediately after the first molding process, i.e., after the arc-shaped portion 11 and the half-angle-shaped portion 12 have been molded. Figure 16 is a right side view of the cylindrical member 3 immediately after the first molding process, i.e., after the arc-shaped portion 11 and the half-angle-shaped portion 12 have been molded, viewed from the right side along the left-right direction. Figure 17 is an explanatory diagram of the front blade surface formation process, showing the cylindrical member 3 during the front blade surface formation process, viewed from the right side along the left-right direction.

[0081] For example, if a half-angled portion 12 is formed within the area where the front blade surface 20 (see Figure 1) is formed in the first molding process, then when the front blade surface 20 is formed in the front blade surface formation process, all of the burrs 38 are removed along with the cut pieces 39.

[0082] Furthermore, in the first molding process of this embodiment, a feature is that burrs are less likely to form on the lower side surface of the tip portion 3a of the cylindrical member 3. The lower portion of the tip portion 3a is formed as a half-angled portion 12, and since the boundary position between the mold surface 61 and the mold surface 71 in the lower portion of the tip portion 3a corresponds to the top of the corner of the half-angled portion 12, burrs are less likely to form due to its shape.

[0083] (Modification 1 of the Second Embodiment) In the description of the second embodiment above, it was explained that in the first molding process, the tip portion 3a of the cylindrical member 3 is sandwiched between the first mold 6 and the second mold 7 from the left and right directions to form the half-angled portion 12. It was also explained that when the tip portion 3a of the cylindrical member 3 is sandwiched between the first mold 6 and the second mold 7 from the left and right directions to form the half-angled portion 12 in the first molding process, for example, the first mold 6 and the second mold 7 may be moved in a direction that brings them close to each other along the same straight line so that the tip portion 3a of the cylindrical member 3 is sandwiched between the first mold 6 and the second mold 7. However, the way in which the first mold 6 and the second mold 7 operate when the tip portion 3a of the cylindrical member 3 is sandwiched between the first mold 6 and the second mold 7, that is, when the first mold 6 and the second mold 7 are closed, is not limited to the above description.

[0084] For example, as shown in Figure 18, the speed at which the upper end of the first mold 6 approaches the upper end of the second mold 7 may be greater than the speed at which the lower end of the first mold 6 approaches the lower end of the second mold 7 (relative speed). In this case, burrs are more likely to form on the upper side surface of the tip portion 3a of the cylindrical member 3, but less likely to form on the lower side surface of the cylindrical member 3. Figure 12 shows the cylindrical member 3 and the like in a front view during the first molding process of this modified example.

[0085] For example, after the first molding process, there may be no burrs on the lower side surface of the cylindrical member 3 that need to be removed. This makes it easier to remove burrs after the first molding process. Specifically, as shown in Figures 15 and 16, if burrs 38 are formed only on the upper side of the tip portion 3a of the cylindrical member 3 and no burrs are formed on the lower side of the cylindrical member 3, then when the front cutting surface 20 (see Figure 1) is formed in the front cutting surface formation process as shown in Figure 17, some or all of these burrs 38 are removed together with the cut piece 39, so separate burr removal may not be necessary.

[0086] As shown in Figure 18, if the speed at which the upper end of the first mold 6 and the upper end of the second mold 7 approach each other is greater than the speed at which the lower end of the first mold 6 and the lower end of the second mold 7 approach each other (relative speed), then for example, the first mold 6 and the second mold 7 may be configured to be rotatable in the left-right direction.

[0087] Specifically, for example, the lower right end of the first mold 6 and the lower left end of the second mold 7 (that is, the lower ends of the first mold 6 and the second mold 7 that face each other when the first mold 6 and the second mold 7 are closed) may be pivotally supported by a pivot shaft 67 parallel to the axial direction, so that the upper ends of the first mold 6 and the second mold 7 can rotate in the left-right direction. In other words, in the first molding process, when sandwiching the cylindrical member 3 between the first mold 6 and the second mold 7, the pivot shaft 67 is positioned at the lower ends of the first mold 6 and the second mold 7 and rotated to sandwich the cylindrical member 3 between the first mold 6 and the second mold 7.

[0088] (Modification 2 of the Second Embodiment) In the description of Modification 1 of the Second Embodiment above, a case was described in which the speed at which the upper end of the first mold 6 approaches the upper end of the second mold 7 approaches is greater than the speed at which the lower end of the first mold 6 approaches the lower end of the second mold 7 (relative speed). However, conversely, the speed at which the lower end of the first mold 6 approaches the lower end of the second mold 7 approaches is greater than the speed at which the upper end of the first mold 6 approaches the upper end of the second mold 7 (relative speed). In other words, the speed at which the upper end of the first mold 6 approaches the lower end of the second mold 7 is made as slow as possible. This may make it less likely for burrs to form on the upper side surface of the tip portion 3a of the cylindrical member 3.

[0089] In the first molding process of this embodiment, as described above, burrs are less likely to form on the lower side surface of the tip portion 3a of the cylindrical member 3. Therefore, if the speed at which the lower end of the first mold 6 and the lower end of the second mold 7 approach each other is greater than the speed at which the upper end of the first mold 6 and the upper end of the second mold 7 approach each other (relative speed), it may become unnecessary to remove burrs after the first molding process.

[0090] As shown in Figure 19, if the speed at which the lower end of the first mold 6 approaches the lower end of the second mold 7 is greater than the speed at which the upper end of the first mold 6 approaches the upper end of the second mold 7 (relative speed), then, for example, as in the modified example 1 described above, the first mold 6 and the second mold 7 may be configured to be rotatable in the left-right direction. Figure 19 shows a cylindrical member 3, etc., in the first molding process of this modified example, viewed from the front.

[0091] Specifically, for example, the upper right end of the first mold 6 and the upper left end of the second mold 7 (that is, the upper ends of the first mold 6 and the second mold 7 that face each other when the first mold 6 and the second mold 7 are closed) may be pivotally supported by a pivot shaft 76 parallel to the axial direction, so that the lower ends of the first mold 6 and the second mold 7 can rotate in the left-right direction. In other words, in the first molding process, when sandwiching the cylindrical member 3 between the first mold 6 and the second mold 7, the pivot shaft 76 is positioned at the upper ends of the first mold 6 and the second mold 7 and rotated to sandwich the cylindrical member 3 between the first mold 6 and the second mold 7.

[0092] Furthermore, in this modified form, the tops (edges) of the corners of the half-angled portion 12 tend to become sharper (more acute). In other words, it has the advantage of being able to make the tops even sharper while suppressing the generation of burrs at the tops of the corners of the half-angled portion 12.

[0093] (Third Embodiment) In the first embodiment described above, for example, as shown in Figures 4 to 7, it was explained that in the first molding step, the tip portion 3a of the cylindrical member 3 may be sandwiched from the outside of the cylindrical member 3 between the first mold 4 and the second mold 5 to form the half-angled portion 12 (see Figures 1 and 2). It was also explained that the front blade surface formation step is performed after the first molding step. The third embodiment differs from the first embodiment in that the first molding step is performed after the front blade surface formation step, and consequently, the procedure of the first molding step differs from that of the first embodiment.

[0094] In this embodiment, as shown in Figure 20, a front blade surface forming step is performed before the first molding step to form the front blade surface 20 (see Figures 1 and 2). Figure 20 is an explanatory diagram of the front blade surface forming step in this embodiment, showing the cylindrical member 3 during the front blade surface forming step as viewed from the right side along the left-right direction.

[0095] In the front blade surface formation process of this embodiment, the tip end 3a of the cylindrical member 3, which does not have a half-angled portion 12 (see Figures 1 and 2), is cut in a direction that intersects the axial direction, and the front blade surface 20 may be formed as shown in Figures 21 and 22. Specifically, as shown in Figure 20, a blade surface overlapping with the axially intersecting cut surface C may be formed from the upper end slightly closer to the base end than the tip of the cylindrical member 3 in the axial direction, toward the lower end on the tip side of the portion where the half-angled portion 12 is to be formed, to form the front blade surface 20 (see Figures 21 and 22). Figure 21 is a right side view of the cylindrical member 3 immediately after the front blade surface formation process. Figure 22 is a front view of the cylindrical member 3 immediately after the front blade surface formation process.

[0096] In the front blade surface forming process, after the front blade surface 20 is formed, as shown in Figures 23 and 24, the inner circumferential surface 10b of the cylinder of the main body 1 in the blade surface portion 2 is biased by the first mold 8, and as shown in Figure 25, a first molding process is performed to form the half-angled portion 12.

[0097] Figures 23 and 25 show the cylindrical member 3 and the like in a front view during the first molding process. Figure 24 shows a cross-sectional view of the cylindrical member 3 and the like in a side view during the first molding process. Figure 24 is a cross-sectional view taken along the line XXIV-XXIV shown in Figure 23.

[0098] As shown in Figure 23, the mold surface 81 of the first mold 8 is preferably a convex shape that follows a V-shape that is convex downwards. The angle of the top 81a of the mold surface 81 (the top of the lower end of the first mold 8), that is, the angle of the valley of the V-shape, is preferably 70° to 110°. The angle of the top of the lower end of the first mold 8 may be, for example, 90°.

[0099] In the first molding process, first, as shown in Figures 23 and 24, the first mold 8 is introduced into the cylinder of the main body 1 through the opening 15, and the top portion 81a of the mold surface 81 is brought into contact with the inner circumferential surface 10b of the cylinder of the main body 1. At this time, the top portion 81a of the mold surface 81 is brought into contact with the position on the inner circumferential surface 10b of the cylinder of the main body 1 that is intended to be the top portion (valley bottom portion 12d, see Figure 2) of the half-angled portion 12 (see Figures 1 and 2). In this embodiment, the top portion 81a of the mold surface 81 is brought into contact with the lower end of the inner circumferential surface 10b. The direction of extension of the top portion 81a should be along the axial direction.

[0100] It is preferable to bring the top portion 81a of the mold surface 81 into contact with the lower end of the inner circumferential surface 10b, and then use the first mold 8 to bias the inner circumferential surface 10b of the cylinder of the main body 1 to form the half-angled portion 12. In this embodiment, for example, the top portion 81a of the mold surface 81 may be used to bias the inner circumferential surface 10b downward to form the half-angled portion 12. In other words, the top portion 81a may be brought close to the bottom portion 91a of the mold surface 91, and the top portion 81a may be used to bias the inner circumferential surface 10b to form the half-angled portion 12.

[0101] In the first molding process, when the first mold 8 biases the inner circumferential surface 10b of the cylinder of the main body 1 at the cutting surface 2, it is preferable to support the lower end of the main body 1 at the cutting surface 2 with the second mold 9, as shown in Figures 23 to 25. That is, the first mold 8 is the punch in molding, and the second mold 9 is the die.

[0102] As shown in Figure 23, the mold surface 91 of the second mold 9 may be a concave shape that follows a V-shape that is convex downwards. The angle of the V-shaped valley at the bottom of the valley 91a of the mold surface 91 is preferably 70° to 110°. The angle of the V-shaped valley at the bottom of the valley 91a of the mold surface 91 may be the same as the angle of the top 81a of the mold surface 81.

[0103] As shown in Figures 23 to 25, when performing the first molding process using the first mold 8 and the second mold 9, for example, while maintaining a state in which the main body 1 is supported by the first mold 8 and the second mold 9 so that the axis of the main body 1 remains stationary, the first mold 8 and the second mold 9 are moved in a direction that brings them closer to each other, and the half-angled portion 12 is molded as shown in Figure 25. This makes it possible to properly mold the half-angled portion 12 while avoiding, for example, bending of the main body 1 in the axial direction.

[0104] (Fourth Embodiment) In the first embodiment described above, for example, as shown in Figures 4 to 7, in the first molding step, the tip portion 3a of the cylindrical member 3 formed in the main body portion 1 (see Figure 1) may be sandwiched from the outside of the cylindrical member 3 between the first mold 4 and the second mold 5 to form the half-angled portion 12 (see Figures 1 and 2). It was then explained that after the first molding step, a front blade surface forming step is performed to obtain the puncture needle 100 (see Figure 1). The fourth embodiment differs from the first embodiment in that, instead of using the cylindrical member 3, the first molding step is performed to form the half-angled portion 12 using a plate-shaped member 3B as shown in Figure 26, and then, before performing the front blade surface forming step, a cylindrical forming step is performed to form the main body portion 1.

[0105] Figures 26 to 28 show, in this order, the molding process of the half-angled portion 12 (see Figure 2) in the first molding step of the manufacturing method for the puncture needle according to this embodiment. Figure 29 shows the tube formation step after the first molding. Figures 26 to 29 show the tubular member 3 and the like in a front view during the first molding step.

[0106] In the first molding process of this embodiment, as shown in Figures 26 and 27, the plate surface of the metal plate-shaped member 3B formed on the main body portion 1 (see Figures 1 and 2) is first placed between the first mold 8 and the second mold 9 (see Figure 26), and then the plate surface of the plate-shaped member 3B is sandwiched between the first mold 8 and the second mold 9 to form the half-angled portion 12 (see Figure 27).

[0107] As shown in Figures 26 and 27, the mold surface 81 of the first mold 8 may be a convex shape that follows a V-shape that is convex downwards, similar to the case of the third embodiment.

[0108] The mold surface 91 of the second mold 9 may also be a concave shape that follows a V-shape that is convex downwards, similar to the case of the third embodiment.

[0109] As described above, the plate-shaped member 3B is sandwiched between the first mold 8 and the second mold 9, causing the plate surface of the plate-shaped member 3B to bend downward along the mold surfaces 81 and 91 in a convex shape, as shown in Figure 27, and forming the half-angled portion 12. When the half-angled portion 12 is formed, the left and right ends 31 and 32 of the plate-shaped member 3B move upward and in a direction that brings the ends 31 and 32 closer together.

[0110] As shown in Figure 27, after performing the first molding process to form the half-angled portion 12, at least the first mold 8 is removed, and as shown in Figures 28 and 29, the cylinder forming process is performed.

[0111] In the cylinder forming process, the plate-shaped member 3B is molded into a cylindrical shape to form the main body portion 1. Forming the main body portion 1 in the cylinder forming process involves forming the base end portion 10 (see Figures 1 and 2) and the arc-shaped portion 11 (see Figures 1, 2, and 29) by molding or other means.

[0112] In the cylinder forming process, first, one end 31 in the left-right direction of the plate-shaped member 3B is curved so that it approaches the other end 32, thereby forming an arc-shaped portion 11 of the plate-shaped member 3B. In the cylinder forming process in this embodiment, the end 31 is curved so that it approaches the end 32, and the end 32 is curved so that it approaches the end 31, thereby forming an arc-shaped portion 11 with the end 31 and the end 32. That is, the end 31 and 32 are curved so that they are close to each other to form an arc-shaped portion 11.

[0113] When forming the arc-shaped portion 11 with end 31 and end 32, the end 31 and end 32 may be curved in any way to form the arc-shaped portion 11. For example, the end 31 and end 32 may be curved using a mold other than the first mold 8 and the second mold 9 to form the arc-shaped portion 11.

[0114] When forming the plate-shaped member 3B into the main body 1, the portion on the base end side of the half-angled portion 12 may be formed into a cylindrical shape by any method. For example, the base end portion 10 (see Figures 1 and 2) may be formed by curving the portion of the plate-shaped member 3B on the base end side of the half-angled portion 12 into a cylindrical shape using a mold other than the first mold 8 and the second mold 9.

[0115] Furthermore, after performing the first molding process to form the half-angled portion 12, the first mold 8 and the second mold 9 may be removed from the plate-shaped member 3B before performing the cylinder forming process.

[0116] Following the cylinder formation process, a front blade surface formation process is performed to form the front blade surface 20 (see Figures 1 and 2), as shown in Figure 30.

[0117] Specifically, as shown in Figure 30, a cutting surface overlapping with the intersecting cutting surface C in the axial direction may be formed from the upper end of the main body portion 1, slightly closer to the base end than the tip, toward the lower end of the half-angled portion 12, and this can be used as the front cutting surface 20. In other words, the portion of the main body portion 1 closer to the tip than the cutting surface C after the cylinder formation process is cut off as a cutting piece 19.

[0118] Figure 30 is an explanatory diagram of the front blade surface formation process of this embodiment, showing the cylindrical member 3 during the front blade surface formation process as viewed from the right side along the left-right direction.

[0119] In this embodiment, an example is shown in which the upper end of the main body portion 1, slightly closer to the base end than the tip (the upper end of the arc-shaped portion 11), is used to form a cutting surface that overlaps with the axially intersecting cutting surface C, starting from the same position as the base end of the half-angle-shaped portion 12 in the axial direction and extending toward the lower end of the half-angle-shaped portion 12 on the tip side, thereby forming the front cutting surface 20 (see Figures 1, 2, and 11).

[0120] Thus, in this embodiment, a puncture needle 100 (see Figure 1) can be obtained by performing a front blade surface formation step after the cylinder formation step.

[0121] As described above, the method for manufacturing a puncture needle according to this embodiment makes it possible to manufacture a puncture needle in which, when viewed along the axial direction of the main body, the blade surface portion has a half-angled shape that follows a V-shape that is convex downwards and an arc-shaped portion that follows an arc-shaped shape that is convex upwards.

[0122] [Another Embodiment] (1) In the above embodiment, as shown in Figure 1, the case in which the puncture needle 100 that can be manufactured by the method for manufacturing a puncture needle according to this embodiment has a front blade surface 20 on the blade surface portion 2 was described. However, the puncture needle 100 that can be manufactured by the method for manufacturing a puncture needle according to this embodiment is not limited to the case in which the blade surface portion 2 has a front blade surface 20.

[0123] The puncture needle 100 manufactured by the manufacturing method of the puncture needle according to this embodiment may have blade surfaces other than the front blade surface 20, as described in the above embodiment. Figure 31 shows an example of another puncture needle 100 that can be manufactured by the manufacturing method of the puncture needle according to this embodiment. As shown in Figure 31, the blade surface portion 2 of the puncture needle 100 may be back-cut, for example, to form a blade surface 21 on the back side. Furthermore, the blade surface portion 2 may have a second front blade surface 25 located further towards the tip than the front blade surface 20, with a different inclination angle from the front blade surface 20.

[0124] These blade surfaces 21 and 25 may be formed after the first molding process. Furthermore, these blade surfaces 21 and 25 may be formed after the front blade surface 20 has been formed.

[0125] Furthermore, the configurations disclosed in the above embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with configurations disclosed in other embodiments, as long as no inconsistencies arise. In addition, the embodiments disclosed herein are illustrative, and the embodiments of this disclosure are not limited thereto and can be modified as appropriate without departing from the purpose of this disclosure.

[0126] This disclosure can be applied to a method for manufacturing a puncture needle.

[0127] 1: Main body 10: Base end 100: Puncture needle 10a: Outer surface 10b: Inner surface 11: Arc-shaped part 12: Half-angled part 12a: Flat part 12b: Flat part 12c: Top part 12d: Bottom part 13: Stepped part 13a: Stepped surface 13b: Stepped surface 15: Opening 19: Cut piece 2: Blade surface part 20: Front blade surface 21: Blade surface 25: Blade surface 3: Cylindrical member 3a: Tip part 30: Base end 31: End part 32: End part 35: Opening 38: Burr 39: Cut piece 3A: Cylindrical member 3B: Plate-shaped member 4: First mold 40: Recess 41: Mold surface 42: Convex part 5: Second mold 50: Concave part 51: Mold surface 6: First mold 61: Mold surface 62: Concave mold part 63: Flat mold part 67: Rotating shaft 7: Second mold 71: Mold surface 72: Concave mold part 73: Flat mold part 76: Rotating shaft 8: First mold 81: Mold surface 81a: Top part 81: Mold surface 9: Second mold 91: Mold surface 91a: Bottom part C: Cut surface

Claims

1. A method for manufacturing a puncture needle, comprising: a cylindrical body made of metal; and a blade surface formed at the tip of the body in the axial direction, having a front blade surface that is inclined with respect to the axial direction and extends from the base end to the tip end of the body in the axial direction, wherein the blade surface has a half-angled shape that follows a V-shape that is convex downward in the vertical direction when the blade surface is viewed from the tip end of the body along the axial direction, with the back side of the front blade surface facing downward and the front side of the front blade surface facing upward, and an arc-shaped part that is convex upward in the vertical direction, the method for manufacturing a puncture needle, comprising a first molding step of sandwiching a metal material to be formed in the body between a first mold and a second mold to form the half-angled shape.

2. The method for manufacturing a puncture needle according to claim 1, wherein in the first molding step, the tip of the metal cylindrical member formed on the main body is sandwiched between the first mold and the second mold from the outside of the cylindrical member to form the half-angled portion.

3. The method for manufacturing a puncture needle according to claim 2, wherein in the first molding step, the tip of the cylindrical member is sandwiched between the first mold and the second mold from the upper and lower directions, the mold surface of the first mold is a concave shape that follows an arc shape that is convex upwards, and the mold surface of the second mold is a concave shape that follows a V shape that is convex downwards.

4. The method for manufacturing a puncture needle according to claim 3, wherein the cylindrical member has an elliptical cross-sectional shape when viewed along the axial direction.

5. The method for manufacturing a puncture needle according to claim 2, wherein in the first molding step, the tip of the cylindrical member is sandwiched between the first mold and the second mold from left and right directions perpendicular to the axial direction and the vertical direction, and the mold surfaces of the first mold and the second mold are concave in an arc shape at the upper end and flat at the lower end.

6. The method for manufacturing a puncture needle according to claim 5, wherein a front blade surface forming step is performed after the first molding step to form the front blade surface.

7. The method for manufacturing a puncture needle according to claim 6, wherein in the first molding step, the half-angled portion is molded within the range in the axial direction where the front cutting surface is formed.

8. The method for manufacturing a puncture needle according to claim 5, wherein in the first molding step, when sandwiching the cylindrical member between the first mold and the second mold, the speed at which the upper end of the first mold and the upper end of the second mold move toward each other is greater than the speed at which the lower end of the first mold and the lower end of the second mold move toward each other.

9. The method for manufacturing a puncture needle according to claim 8, wherein in the first molding step, when sandwiching the cylindrical member between the first mold and the second mold, pivot axes are positioned at the lower ends of the first mold and the second mold and rotated to sandwich the cylindrical member between the first mold and the second mold.

10. The method for manufacturing a puncture needle according to claim 5, wherein in the first molding step, when sandwiching the cylindrical member between the first mold and the second mold, the speed at which the lower end of the first mold and the lower end of the second mold move toward each other is greater than the speed at which the upper end of the first mold and the upper end of the second mold move toward each other.

11. The method for manufacturing a puncture needle according to claim 10, wherein in the first molding step, when sandwiching the cylindrical member between the first mold and the second mold, pivot axes are positioned at the upper ends of the first mold and the second mold and rotated to sandwich the cylindrical member between the first mold and the second mold.

12. A method for manufacturing a puncture needle according to claim 1, wherein a front blade surface forming step is performed before the first molding step to form the front blade surface, and in the first molding step, the first mold biases the inner circumferential surface of the cylinder of the main body portion at the blade surface portion to form the half-angled shape portion.

13. The method for manufacturing a puncture needle according to claim 12, wherein the mold surface of the first mold has a convex shape that follows a V-shape that is convex downwards.

14. The method for manufacturing a puncture needle according to claim 13, wherein in the first molding step, the second mold supports the lower end of the main body portion on the blade surface portion, and the mold surface of the second mold has a concave shape that follows a V-shape that is convex downwards.

15. The method for manufacturing a puncture needle according to claim 1, wherein in the first molding step, the plate surface of the metal plate-shaped member formed on the main body is sandwiched between the first mold and the second mold to form the half-angled portion.

16. The method for manufacturing a puncture needle according to claim 15, wherein, after the first molding step, a cylindrical forming step is performed in which one end of the plate-shaped member in the left-right direction perpendicular to the axial direction and the vertical direction is curved so as to be close to the other end, thereby forming the arc-shaped portion of the plate-shaped member.

17. The method for manufacturing a puncture needle according to claim 16, wherein the mold surface of the first mold is a convex shape following a V-shape that is convex downwards, and the mold surface of the second mold is a concave shape following a V-shape that is convex downwards.

18. The method for manufacturing a puncture needle according to claim 17, wherein a front blade surface forming step is performed after the tube forming step to form the front blade surface.

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