WO2014033902A1

WO2014033902A1 - Butterfly needle

Info

Publication number: WO2014033902A1
Application number: PCT/JP2012/072125
Authority: WO
Inventors: 五十嵐政嗣
Original assignee: テルモ株式会社
Priority date: 2012-08-31
Filing date: 2012-08-31
Publication date: 2014-03-06
Also published as: JPWO2014033902A1

Abstract

This butterfly needle (12) includes a needle body (16) and a wing member (18). The wing member (18) has a shaft (28) attached to the needle body (16), and a pair of elastically deformable wings (30a, 30b) extending in mutually opposite directions from the shaft (28). The base-side end (36) of each of the pair of wings (30a, 30b) is inclined so as to come closer to the shaft (28) towards the base direction. The wings (30a, 30b) have an outer wing part (31), a thin part (32), and a step part (34, 34a) therebetween. At least the base end of the step part (34, 34a) is inclined so as to become gradually thicker from the side of the thin part (32) towards the side of the outer wing part (31).

Description

Winged needle

The present invention relates to a winged needle used for blood collection, blood transfusion, infusion, and the like.

Gripping and indwelling as a type of medical needle that is used for blood collection, blood transfusion, infusion, etc., connected to blood bags, blood processing circuits (component blood collection circuit, hemodialysis circuit, etc.), blood transfusion set, infusion set, etc. A winged needle in which a wing is provided on a needle hub to make it easier to handle is known. When discarding the winged needle after use, it is necessary to cover the needle body in order to prevent the disposal operator from inadvertently touching the needle body. Therefore, conventionally, a winged needle having a protector capable of covering the used needle body has been proposed.

As this type of protector, there is one provided with a pair of slits that extend in the axial direction and into which a wing can be inserted (see, for example, JP-A-8-206195). When the needle body is accommodated, the protector is moved in the distal direction along the tube connected to the proximal end of the needle body, and a wing is inserted into the slit of the protector so that the needle body is completely covered by the protector.

As a protector different from the above, Japanese Patent No. 4182756 proposes a needle cover having an opening on the tip side inclined with respect to the axis of the needle cover. While holding the needle cover, pull the proximal conduit connected to the proximal end of the winged needle toward the proximal side, and the proximal edge of the winged needle on the left and right sides of the distal end opening of the needle cover Are in contact with each other, and the wing portion is folded and accommodated in the needle cover.

In the case of a protector provided with a slit, it is necessary to align the position of the slit and the wing, that is, there is directivity, and the accommodation operation of the winged needle is troublesome. Further, in the case of the needle cover having an inclined distal end opening disclosed in Japanese Patent No. 4182756, the needle cover and the needle cover are arranged so that the proximal end side edge of the wing portion is in contact with both side surfaces of the inclined distal end opening. It is necessary to adjust the direction of the winged needle, that is, there is directivity, and the accommodation operation of the winged needle is troublesome.

The present invention has been made in view of such problems, and an object thereof is to provide a winged needle that can be accommodated in a protector with a simple operation.

In order to achieve the above object, a needle body having a needle tip at the tip, and a wing member attached to the needle body, and after use, is inserted into the protector from the tip opening of the protector, and the needle A winged needle that is covered with the body and is accommodated in the protector in a state where the wing member is folded, wherein the wing member includes a shaft portion fixed to the needle body, and an opposite direction from the shaft portion. A pair of elastically deformable wings, each of the pair of wings being inclined so that a proximal end side edge thereof approaches the shaft portion side toward the proximal end direction. Has an outer wing portion that forms the outer side, a thin portion that forms the base side and is thinner than the outer wing portion, and a stepped portion that forms between the outer wing portion and the thin portion. And at least the base end of the stepped portion is the thin-walled portion side. Characterized in that inclined to become gradually thick toward the outer blade portion side.

According to the above configuration, since the base end side edge of the wing is inclined, the deformation (folding) of the wing is promoted by the action of the inclination at the initial stage of drawing the winged needle into the protector. Therefore, the wing is drawn into the protector while being deformed, and is thereby accommodated in the protector in a state where the wing is folded. In the case of the present invention, a protector having a circular tip opening perpendicular to the extending direction of the protector can be used as a protector that accommodates the winged needle, and the wing shape when the winged needle is accommodated in the protector. There is no directionality (directivity) around the axis of the needle. That is, regardless of the relative positional relationship between the protector and the winged needle in the circumferential direction, the winged needle can be reliably and easily accommodated in the protector by the operation of drawing the winged needle into the protector. Further, in the present invention, when the winged needle is pulled into the protector, the stepped portion is not easily caught by the tip opening of the protector. Therefore, it can be accommodated more smoothly.

In the above winged needle, a portion of the stepped portion that is continuous with the base end side edge may be formed to draw an arc. According to this configuration, a portion of the stepped portion that is continuous with the proximal end edge is not easily caught by the tip opening of the protector. Therefore, it can be accommodated more smoothly.

In the above winged needle, a portion that continues from the outer edge of the wing to the proximal edge may be formed to draw an arc. According to this configuration, when the winged needle is pulled into the protector, the portion that continues from the outer edge of the wing to the proximal edge is less likely to be caught by the tip opening of the protector. Therefore, it can be accommodated more smoothly.

It is a top view of the winged needle assembly provided with the winged needle concerning one embodiment of the present invention. It is a disassembled perspective view of the winged needle assembly shown in FIG. 3A is a partial plan view of the winged needle in the winged needle assembly shown in FIG. 1, and FIG. 3B is a cross-sectional view taken along line IIIB-IIIB in FIG. 3A. It is a figure which shows the state which the wing of the winged needle contact | abutted to the front-end | tip opening part of the protector. It is a figure which shows the initial state in which the wing | wing of a winged needle is folded. It is a figure which shows the state in which the winged needle was completely accommodated in the protector. FIG. 7 is a plan view showing a winged needle provided with a wing member according to a modification.

Hereinafter, preferred embodiments of the winged needle according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a plan view of a winged needle assembly 10 including a winged needle 12 according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the winged needle assembly 10. The winged needle assembly 10 includes a winged needle 12 that is punctured by a patient, and a protector 14 that is attached to the winged needle 12 and accommodates the winged needle 12 after the use of the winged needle 12. The winged needle assembly 10 is used by fixing the winged needle 12 in a state where the winged needle 12 is punctured into a patient's skin during blood collection, blood transfusion, infusion, or the like.

The winged needle 12 includes a needle body 16 and a wing member 18 attached to the needle body 16. The needle body 16 includes a needle body 20 having a sharp needle tip 20a and a multistage cylindrical hub 22 fixed to the proximal end side of the needle body 20, and is configured as a needle assembly.

The needle body 20 is a portion that is punctured into the skin of a patient undergoing treatment such as blood collection, blood transfusion, and infusion, and is configured in a circular tube shape having a hollow portion that serves as a flow path for body fluid such as blood or infusion. An opening 20 b that functions as a liquid inlet / outlet is formed at the tip of the needle body 20. The needle body 20 can be made of, for example, a metal material such as stainless steel, aluminum or an aluminum alloy, titanium or a titanium alloy, or a hard resin.

The hub 22 is a hollow cylindrical member connected to the proximal end of the needle body 20 and supports the needle body 20. In the present embodiment, the hub 22 includes a large-diameter portion 22a that forms the distal end side, and a small-diameter portion 22b that extends from the large-diameter portion 22a in the proximal direction and has a smaller outer diameter than the large-diameter portion 22a. The hub 22 can be made of a hard resin such as polyvinyl chloride, polyethylene, or polycarbonate.

The proximal end portion of the small diameter portion 22b protrudes from the proximal end of the wing member 18 and is connected to one end of a long tube 24 having flexibility. The other end of the tube 24 is connected to a container such as a blood transfusion bag, a blood collection bag, or an infusion bag (not shown).

As shown in FIG. 1, a cap 26 is attached to the winged needle 12 before the winged needle assembly 10 is used. The cap 26 has a hollow cylindrical shape that can accommodate the needle body 20 therein, and covers the needle body 20 by fitting the distal end side (large diameter portion 22a) of the hub 22 on the proximal end side. Mounted in a state. When the winged needle assembly 10 is used, the cap 26 can be detached from the winged needle 12 by pulling the cap 26 in the distal direction, and the needle body 20 can be exposed.

As shown in FIG. 1, the wing member 18 includes a hollow shaft portion 28 and a pair of elastically deformable plate-

like wings

30a and 30b extending from the lower portion of the shaft portion 28 to the left and right. The small diameter portion 22 b of the hub 22 described above is inserted into the shaft portion 28. The shaft portion 28 is rotatable with respect to the hub 22, whereby the needle body 16 and the wing member 18 are relatively rotatable. The

wings

30a and 30b have flexibility and can be opened and closed (folded) when the vicinity of the root portion is bent or curved.

The

wings

30a and 30b are configured between the outer wing part 31 constituting the outer side, the thin part 32 constituting the root side and being thinner than the outer wing part 31, and the outer wing part 31 and the thin part 32. And a stepped portion 34. By providing the thin portion 32 on the base side of the

wings

30a and 30b, the

wings

30a and 30b can be easily opened and closed. As shown in FIG. 2, in this embodiment, the thin part 32 is formed when the upper surface of the base side of the

wings

30a and 30b is dented.

As shown in FIG. 3A, each of the pair of

wings

30a and 30b has a proximal end edge 36 at the proximal end so that the

wings

30a and 30b are easily folded when the winged needle 12 is accommodated in the protector 14. It inclines so that it may approach the axial part 28 side as it goes to a direction. The inclination angle α of the base end edge 36 with respect to the plane S1 perpendicular to the axis a is, for example, about 5 to 30 °, preferably 10 to 25 °, and more preferably 20 °. When the inclination angle α is too small, the

wings

30 a and 30 b are not easily folded when being accommodated in the protector 14. When the inclination angle α is too large, the areas of the

wings

30a and 30b become small, and it is difficult to grip the

wings

30a and 30b. The axis a is an axis common to the needle body 16 and the shaft portion 28.

When the winged needle 12 is pulled into the protector 14, the outer portions of the

wings

30a and 30b are connected to the proximal end edge 36 from the outer edge 37 of the

wings

30a and 30b so that the outer portions of the

wings

30a and 30b are not caught by the tip opening 40 of the protector 14. The portion 38 is formed so as to draw a gentle arc (curve) in plan view. The radius of curvature of the portion 38 formed to draw an arc is, for example, about 1 to 10 mm, and preferably about 6 to 8 mm.

As shown in FIG. 3B, which is a cross-sectional view taken along the line IIIB-IIIB in FIG. 3A, in the present embodiment, the stepped portion 34 gradually increases in thickness from the thin portion 32 side toward the outer wing portion 31 side. So as to be inclined. The inclination angle β of the step portion 34 is, for example, about 30 to 60 ° with respect to the surface S2 on which the

wings

30a and 30b extend, and preferably about 45 °. By providing such a slope in the stepped portion 34, it is possible to prevent the stepped portion 34 from being caught by the tip opening 40 of the protector 14 when the winged needle 12 is pulled into the protector 14. It should be noted that the inclination of the stepped portion 34 only needs to be provided at least at the base end of the stepped portion 34, and portions other than the base end of the stepped portion 34 are perpendicular to the surface S2 on which the

wings

30a and 30b extend. It may be a step that rises.

As shown in FIG. 3A, in this embodiment, the portion (base end of the stepped portion 34) that is continuous with the base end side edge 36 in the stepped portion 34 is chamfered so as to draw an arc in plan view. Is formed. With this configuration, when the winged needle 12 is pulled into the protector 14, it is possible to more suitably prevent the base end of the stepped portion 34 from being caught by the distal end opening 40 of the protector 14. The radius of curvature of the portion formed so as to draw an arc is, for example, about 0.5 to 3 mm, and preferably about 1 to 2 mm.

Further, in the present embodiment, the stepped portion 34 approaches the outer end side of the

wings

30a, 30b toward the distal end so that the

wings

30a, 30b are easily folded when the winged needle 12 is pulled into the protector 14. It is inclined with respect to the axis a. The inclination angle γ is, for example, 1 to 20 °, and more preferably 15 °. If the inclination angle γ is too large, the area of the thin portion 32 increases and the

wings

30a and 30b become too soft, making it difficult to puncture the patient.

The wing member 18 may be made of a soft resin material so that the base sides (thin wall portions 32) of the

wings

30a and 30b are bent and have appropriate flexibility that can be easily opened and closed. The wing member 18 may be formed by separately manufacturing the shaft portion 28 made of a hard resin material and the

wings

30a and 30b made of a soft resin material, and combining them.

The protector 14 is displaceable in the direction of the axis a with respect to the winged needle 12, and covers the needle tip 20 a and the wing member 18 of the needle body 20 when moving in the distal direction relative to the winged needle 12. is there. As shown in FIG. 1, specifically, the protector 14 is a hollow cylindrical member and has a circular tip opening 40 perpendicular to the axial direction (extending direction) thereof. The base end wall of the protector 14 is provided with an insertion hole 42 through which the tube 24 is inserted, and the protector 14 can be displaced along the tube 24.

The full length of the protector 14 is longer than the full length of the winged needle 12, and the winged needle 12 is accommodated at the deepest position in the protector 14 with the

wings

30 a and 30 b folded, and the needle body 20 of the winged needle 12. The needle tip 20 a is on the proximal end side with respect to the distal end opening 40 of the protector 14. That is, the needle tip 20a does not protrude from the tip opening 40.

The material of the protector 14 is not particularly limited as long as the wing-like needle 12 with the

wings

30a and 30b folded is accommodated therein and has an appropriate rigidity enough to support the reaction force from the

wings

30a and 30b. However, a transparent or translucent material is preferable because the retracted position of the winged needle 12 and the folded state of the

wings

30a and 30b can be confirmed. Examples of such a transparent or translucent material include polyethylene, polypropylene, polycarbonate, acrylic resin, and the like.

The protector 14 includes a tapered portion 44 whose inner diameter decreases from the distal end opening 40 toward the proximal end side, and a parallel portion 46 that is connected to the proximal end side of the tapered portion 44 and has a constant inner diameter. More specifically, the taper portion 44 includes a first taper portion 44a on the distal end opening 40 side and a second taper portion 44b whose inner diameter decreases toward the proximal end with a gentler inclination than the first taper portion 44a. And have. The length of the second taper portion 44b in the axial direction is longer than that of the first taper portion 44a.

As shown in FIG. 1, in this embodiment, the inner peripheral edge 40 a of the distal end opening 40 is chamfered so that the inner diameter decreases toward the proximal end so that the

wings

30 a and 30 b can be easily pulled into the protector 14. ing.

The winged needle assembly 10 including the winged needle 12 according to the present embodiment is basically configured as described above, and the operation and effect thereof will be described below.

In order to perform blood collection, blood transfusion, infusion, etc. using the winged needle assembly 10 configured as described above, first, the cap 26 is removed from the winged needle 12 to expose the needle body 16. Next, the pair of

wings

30a and 30b are picked with fingers and closed (folded). Specifically, the thin portions 32 of both

wings

30a and 30b are bent and closed so that one wing 30a and the other wing 30b overlap each other.

If the

wings

30a and 30b are in the closed state, the needle body 16 is punctured into the living body while holding the

closed wings

30a and 30b with fingers. When the needle body 16 is left in the state of being punctured with respect to the living body, the

wings

30a and 30b are returned to the opened state, and the

wings

30a and 30b are fixed to the skin with an adhesive tape or the like.

When blood collection, blood transfusion, infusion, etc. are completed, the fixing of the

wings

30a, 30b to the skin with an adhesive tape or the like is released, and the needle body 16 is removed from the living body. In this way, when the use of the winged needle 12 is finished, the protector 14 prevents the needle 16 from being inadvertently touched by a medical worker such as a person who discards the winged needle assembly 10. The “accommodating operation” is performed to cover and accommodate the winged needle 12 including.

In this accommodation operation, the winged needle 12 is retracted with respect to the protector 14 by pulling the tube 24 toward the proximal end while holding the protector 14 (the protector 14 is moved in the distal direction relative to the winged needle 12). ) Then, first, as shown in FIG. 4, the proximal end edges 36 of the

wings

30 a and 30 b of the winged needle 12 abut on the distal end opening 40 of the protector 14. When the tube 24 is further pulled in the proximal direction from this state, as shown in FIG. 5, the

wings

30a and 30b are drawn into the protector 14 while being folded so that the outer wing portion 31 faces the needle tip 20a side. start.

In this case, in this embodiment, the base end side edge 36 of the

wings

30a and 30b is inclined so as to approach the shaft portion 28 side toward the base end side (see FIGS. 1 and 3A). Since the deformation of the

wings

30a and 30b is promoted, the

wings

30a and 30b are easily pulled into the protector 14. 5 shows a state in which both

wings

30a and 30b are deformed to the back side, conversely, both

wings

30a and 30b may be deformed to the front side. In addition, one of the

wings

30a and 30b may be deformed to the front side and the other may be deformed to the back side.

Moreover, in this embodiment, since the inner peripheral edge 40a of the front-end | tip opening part 40 of the protector 14 is chamfered so that an internal diameter may reduce toward a base end side (refer FIG. 1), the base end of

wings

30a and 30b In combination with the inclination of the side edge 36, the

wings

30 a and 30 b are easily pulled into the protector 14.

As shown in FIG. 5, when the

wings

30a and 30b are deformed to the back side and are started to be drawn into the protector 14, the step portions 34 provided on the

wings

30a and 30b are located outside. Therefore, after the

wings

30a and 30b begin to be pulled into the protector 14, the stepped portion 34 (particularly the base end thereof) comes into contact with the distal end opening 40 of the protector 14 in due course. In the present embodiment, the stepped portion 34 is provided with an inclination with respect to the surface S2 of the

wings

30a and 30b (see FIG. 3B), so that the stepped portion 34 (particularly the base end thereof) is not easily caught by the distal end opening 40. Therefore, the

wings

30a and 30b can be smoothly drawn into the protector 14.

In the present embodiment, the stepped portion 34 is inclined with respect to the axis a so as to approach the outer end side of the

wings

30a and 30b as it goes in the distal direction (see FIG. 3A). Compared with the structure which is not inclined, the area of the thin part 32 is ensured large. For this reason, the softness | flexibility in the thin part 32 of the

wings

30a and 30b is fully ensured, the

wings

30a and 30b are easy to be folded, and can be easily drawn in in the protector 14. FIG.

Further, due to the inclination of the step portion 34 with respect to the axis a, the region on the front end side of the thin portion 32 is expanded closer to the outer end side of the

wings

30a and 30b as compared with the case where there is no inclination. For this reason, as shown in FIG. 5, the

wings

30a and 30b are easily bent toward the needle tip 20a, and the pull-in resistance during the housing operation can be suitably reduced.

Then, when the

wings

30a and 30b are further drawn into the protector 14, the outer wings 31 of the

wings

30a and 30b come into contact with the tip opening 40 of the protector 14 this time. In this case, in this embodiment, since the part 38 (refer FIG. 3A) which continues from the outer edge 37 of the

wings

30a and 30b to the base end edge 36 is formed so that an arc may be drawn, of the

wings

30a and 30b The outer wing 31 is not easily caught by the tip opening 40 of the protector 14. Therefore, the

wings

30a and 30b can be smoothly drawn into the protector 14.

As shown in FIG. 6, when the winged needle 12 is fully pulled into the protector 14, the

wings

30 a and 30 b are positioned in the parallel part 46 of the protector 14, and the needle tip 20 a of the winged needle 12 is the tip opening of the protector 14. It will be in the state located in the base end side rather than 40. That is, the needle tip 20a does not protrude from the tip opening 40 of the protector 14, and the user cannot touch the needle tip 20a. In this case, since the

wings

30a and 30b are stretched outward in the parallel portion 46 by their own elastic force, the winged needle 12 moves in the distal direction with respect to the protector 14, and the needle tip 20a is moved from the protector 14 again. Protruding is preferably suppressed.

As described above, according to the winged needle 12 according to the present embodiment, the base end side edge 36 of the

wings

30a and 30b is inclined, so that the winged needle 12 is pulled into the protector 14 at an initial stage. The deformation (folding) of the

wings

30a and 30b is promoted by the action of the inclination. Accordingly, the

wings

30a and 30b are drawn into the protector 14 while being deformed, and thereby the

wings

30a and 30b are accommodated in the protector 14 in a folded state.

Since the tip opening 40 of the protector 14 has a circular shape perpendicular to the axis a, there is no directionality (directivity) about the axis a of the wing needle 12 when the wing needle 12 is accommodated in the protector 14. . In other words, regardless of the relative positional relationship between the protector 14 and the winged needle 12 in the circumferential direction, the winged needle 12 can be reliably and easily accommodated in the protector 14 by the operation of drawing the winged needle 12 into the protector 14.

In the case of the present embodiment, the portion of the

wings

30a, 30b that extends from the outer edge 37 to the proximal edge 36 is formed to draw an arc. Therefore, when the winged needle 12 is pulled into the protector 14, The corner is not easily caught by the tip opening 40 of the protector 14. Therefore, it can be accommodated more smoothly.

In the case of this embodiment, at least the base end of the step part 34 between the outer wing part 31 and the thin part 32 is inclined so as to gradually become thicker from the thin part 32 side toward the outer wing part 31 side. Therefore, when the winged needle 12 is pulled into the protector 14, the stepped portion 34 is not easily caught by the tip opening 40 of the protector 14. Therefore, it can be accommodated more smoothly.

In the case of the present embodiment, the portion of the step portion 34 that is connected to the base end side edge 36 is formed so as to draw an arc, so that the portion is not easily caught by the distal end opening 40 of the protector 14. Therefore, it can be accommodated more smoothly.

In the case of the present embodiment, the stepped portion 34 between the outer wing portion 31 and the thin portion 32 is inclined with respect to the axis a so as to approach the outer end side of the

wings

30a and 30b toward the tip direction. When the winged needle 12 is pulled into the protector 14, the

wings

30a and 30b are easily folded. Therefore, it can be accommodated more smoothly.

In the case of this embodiment, since the inner peripheral edge 40a of the distal end opening 40 is chamfered so that the inner diameter decreases toward the proximal end side, the

wings

30a and 30b can be drawn into the protector 14 more smoothly. .

In the case of the present embodiment, the protector 14 includes a tapered portion 44 whose inner diameter decreases from the distal end opening 40 toward the proximal end side, and a parallel portion 46 that is connected to the proximal end side of the tapered portion 44 and has a constant inner diameter. According to this configuration, when the winged needle 12 is housed in the protector 14, the

wings

30a and 30b can be smoothly folded by the taper portion 44, and the wing 30a and the wing 30a that are about to spread by the elastic force are formed in the parallel portion 46. By fixing the winged needle 12 in response to the reaction force from 30b, the winged needle 12 can be prevented from moving in the distal direction with respect to the protector 14.

In the winged needle assembly 10 described above, instead of the winged needle 12, a winged needle 12a provided with a wing member 18a according to a modification shown in FIG.

The wing member 18a according to the modified example is the same as the wing member 18 in the following points. The base end side edge 36 of the

wings

30a and 30b is inclined so as to approach the shaft portion 28 side toward the base end direction. A portion 38 extending from the outer edge 37 to the proximal edge 36 of the

wings

30a and 30b is formed to draw an arc. The step 34 a between the outer wing 31 and the thin portion 32 is inclined so as to gradually increase in thickness from the thin portion 32 side toward the outer wing portion 31 side. A portion connected to the base end side edge 36 in the stepped portion 34a is formed to draw an arc. On the other hand, the wing member 18 a differs from the wing member 18 in that the stepped portion 34 a extends in parallel with the shaft portion 28.

Even when the wing member 18a according to the modification is employed, the base end side edge 36 of the

wings

30a and 30b is inclined so as to approach the shaft portion 28 side toward the base end direction. The deformation of the

wings

30a and 30b in the initial stage of drawing into the protector 14 can be promoted, and the

wings

30a and 30b can be smoothly introduced into the protector 14. Therefore, the operation of accommodating the winged needle 12a in the protector 14 can be easily performed. Further, when the winged needle 12 a is pulled into the protector 14, the portion 38 that continues from the outer end edge 37 of the

wings

30 a and 30 b to the base end side edge 36 is not easily caught by the distal end opening 40 of the protector 14. Since the stepped portion 34a is inclined with respect to the surfaces of the

wings

30a and 30b, the stepped portion 34a is not easily caught by the tip opening 40 of the protector 14.

In the above description, the present invention has been described with reference to preferred embodiments. However, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. Yes.

Claims

A needle body (16) having a needle tip (20a) at the tip;
A wing member (18, 18a) attached to the needle body (16),
After use, it is inserted into the protector (14) from the tip opening (40) of the protector (14), the needle body (16) is covered, and the wing members (18, 18a) are folded. A winged needle (12, 12a) housed in the protector (14),
The wing member (18, 18a) includes a shaft portion (28) fixed to the needle body (16) and a pair of elastically deformable wings (30a) extending from the shaft portion (28) in opposite directions. 30b)
Each of the pair of wings (30a, 30b) is inclined so that its proximal end edge (36) approaches the shaft portion (28) side toward the proximal direction,
The wings (30a, 30b) include an outer wing part (31) constituting the outer side, a thin wall part (32) constituting the base side and formed thinner than the outer wing part (31), and the outer wing. A step portion (34, 34a) that constitutes a portion between the portion (31) and the thin portion (32),
At least a base end of the stepped portion (34, 34a) is inclined so as to gradually increase in thickness from the thin portion (32) side toward the outer wing portion (31) side.
A winged needle (12, 12a) characterized in that.
The winged needle (12, 12a) according to claim 1,
A portion connected to the base end side edge (36) in the stepped portion (34, 34a) is formed to draw an arc.
A winged needle (12, 12a) characterized in that.
The winged needle (12, 12a) according to claim 1 or 2,
A portion (38) connected from the outer edge of the wing (30a, 30b) to the proximal edge (36) is formed to draw an arc.
A winged needle (12, 12a) characterized in that.