Needle tip protector for wing-shaped needle

Abstract

The present invention provides a needle tip protector for a wing-shaped needle, which has a novel structure and can prevent the needle tip of the wing-shaped needle from being exposed to the tip side again when two wing parts of the wing-shaped needle are inserted into slits on both sides in the circumferential direction of one protection sheet in a structure having four protection sheets. A needle tip protector (10) for a wing-shaped needle for protecting a wing-shaped needle (46) provided with two wing parts (58, 58), in which slits (38) into which the wing parts (58) of the wing-shaped needle (46) can be inserted are respectively formed between four protection sheets (36, 36, 36, 36) arranged in a cylindrical shape in the circumferential direction, and four housing windows (34, 34, 34, 34, 34) connected to the slits (38) are provided on the base end side of the protection sheets (36). The slits (38) are connected to the housing window section (34) at positions offset from the center and both ends of the housing window section (34) in the circumferential direction.

Description

Technical Field

[0001] The present invention relates to a needle tip protector for a winged needle for accommodating and protecting the winged needle after use. Background Art

[0002] In the past, in order to avoid accidental puncture after the winged needle used for dialysis, blood collection, etc. is removed, a needle tip protector for a winged needle has been proposed. For example, as shown in the specification of U.S. Patent No. 6554807 (Patent Document 1), the needle tip protector for a winged needle has a protective sheet configured in a cylindrical shape, and the needle tip of the winged needle is accommodated on the inner circumference of the protective sheet, so that the needle tip of the winged needle is protected by the needle tip protector. In such a needle tip protector, by inserting the wing portion of the winged needle into the circumferential slit of the protective sheet, the winged needle can be moved toward the base end side relative to the needle tip protector, and the needle tip of the winged needle can be accommodated in the needle tip protector.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: U.S. Patent No. 6554807 Summary of the invention

[0006] Problems to be solved by the invention

[0007] Incidentally, in the case where the wing-shaped needle has two wing portions extending toward both outer sides at right angles to the axis, it is also conceivable to provide four protective sheets and provide slits every 90 degrees in the circumferential direction so as to facilitate the insertion of the wing portions into the slits. In such a structure, it is predetermined that the two wing portions are inserted into the slits located on both sides of the radial direction so that two protective sheets exist between the wing portions of one of the two wing portions in the circumferential direction and two protective sheets also exist between the wing portions of the other wing portions in the circumferential direction.

[0008] However, it is newly known that, depending on the orientation of the wing-shaped needle when the wing is inserted into the slit, the inclination of the wing in the circumferential direction, etc., there is a case where, for example, two wings are inserted into slits provided adjacent to each other on both sides of a protective sheet in the circumferential direction, one of the two wings has one protective sheet between the wing parts in the circumferential direction, and three protective sheets are between the wing parts in the circumferential direction of the other wing, forming a shape different from the predetermined shape. In this case, there is a risk that the protective sheet is deformed and has an adverse effect on the protective function of the wing-shaped needle, which causes some obstacles to the movement and function.

[0009] The problem to be solved by the present invention is to provide a needle tip protector for a winged needle with a novel structure, which solves at least one of the above-mentioned problems that may occur when there are four protection sheets.

[0010] Means used to solve problems

[0011] The following describes the preferred modes for understanding the present invention, but the modes described below are described for exemplary purposes, and can be used in combination with each other as appropriate. The multiple components described in each mode can also be identified and used as independently as possible, and can also be used in combination with any component described in other modes as appropriate. Therefore, the present invention is not limited to the modes described below, and various other modes can be realized.

[0012] The first method is a needle tip protector for a winged needle, which protects a winged needle having two wing portions, wherein four protective sheets are arranged in a cylindrical shape, and slits for inserting the wing portions of the winged needle are formed between the circumferential directions of the protective sheets, and four accommodating windows connected to the slits are provided on the base end side of the protective sheet, and the slits are connected to the accommodating windows at positions deviated from the circumferential center and both ends of the accommodating windows.

[0013] When the two wings of the wing-shaped needle are respectively inserted into the slits provided on both sides of a protective sheet, the wings are accommodated in the accommodation window in a state of being tilted in the circumferential direction, so that the wings in the accommodation window are easily pressed against the inner surface of the circumferential wall of the accommodation window. In this case, according to the needle tip protector for the wing-shaped needle formed in accordance with the structure of this embodiment, the connection portion of the slit connected to the accommodation window is set at a position deviated from the circumferential ends of the accommodation window, so that the wings located at the circumferential ends of the accommodation window are not easy to return to the slit. Therefore, by preventing the wing-shaped needle from moving toward the needle tip side relative to the needle tip protector, the needle tip of the wing-shaped needle can be prevented from being exposed again to the front end side, and the occurrence of mispuncture caused by the re-exposure of the needle tip can be prevented.

[0014] In addition, by setting the connection position between the slit and the accommodating window portion at a position deviated from the circumferential center of the accommodating window portion, for example, by positioning the wing portion accommodated in the accommodating window portion at the circumferential center within the accommodating window portion, the wing portion can be prevented from returning to the slit.

[0015] A second aspect is the needle tip protector for a winged needle according to the first aspect, wherein an inclined portion inclined in the circumferential direction is provided in the middle of the slit, and the slit is located at positions offset from each other in the circumferential direction on both sides of the inclined portion.

[0016] According to the needle tip protector for a winged needle formed in accordance with the present embodiment, by providing an inclined portion in the middle of the slit, even if, for example, four protective sheets are formed in substantially the same shape and the opening position of the front end side of the slit is set at the circumferential center of the storage window, the connection position of the slit to the storage window can be set at a position deviated from the circumferential center of the storage window. Thus, for example, when the needle is inserted into the slit in a manner that two protective sheets are present between the circumference of one of the two wings and two protective sheets are present between the circumference of the other wing, even if the winged needle that enters the storage window from the slit moves toward the circumferential center due to the reaction force of the twisting of the tube connected to the winged needle when passing through the inclined portion, the wing accommodated in the storage window is not easy to return to the slit, thereby preventing the winged needle from being exposed to the front end side again.

[0017] The third method is a needle tip protector for a winged needle, which protects a winged needle having two wing portions, wherein four protective sheets are arranged in a cylindrical shape, and slits for inserting the wing portions of the winged needle are formed circumferentially between these protective sheets, and four accommodating windows connected to the slits are provided on the base end side of the protective sheet, and between the accommodating windows, a columnar portion is extended from the protective sheet toward the base end side to separate the accommodating windows adjacent to each other in the circumferential direction, and the circumferential angle of the columnar portion around the central axis is less than 30 degrees.

[0018] According to the needle tip protector for a winged needle having a structure according to this embodiment, for example, when the two wings of the winged needle are respectively inserted into the slits on both sides of a protective sheet in the circumferential direction, the force applied to the columnar portion and the protective sheet can be reduced by pressing the wings against the columnar portion. Therefore, when the winged needle is accommodated and protected in the needle tip protector, the displacement of the protective sheet caused by the contact of the wings can be suppressed, and the exposure of the needle tip caused by the separation of the protective sheets in the circumferential direction and the radial direction can be prevented.

[0019] A fourth aspect is the needle tip protector for a winged needle according to the third aspect, wherein a circumferential angle of the columnar portion is 10 degrees or more.

[0020] According to the needle tip protector for a winged needle formed in accordance with the present embodiment, the strength of the columnar portion can be ensured while reducing the force exerted by the wing portion pressing against the columnar portion, and the needle tip protection function can be effectively exerted by suppressing the displacement of the protection sheet caused by the deformation of the columnar portion.

[0021] The fifth method is a needle tip protector for a winged needle, which protects a winged needle having two wing portions, wherein four protective sheets are arranged in a cylindrical shape, and slits for inserting the wing portions of the winged needle are respectively formed between the protective sheets in the circumferential direction, and four accommodating windows connected to the slits are provided on the base end side of the protective sheet, and a tube insertion portion for inserting a tube extending toward the base end side of the winged needle is provided at a position closer to the base end side than the accommodating windows, and an annular retaining portion continuous throughout the entire circumference is provided at the end of the tube insertion portion on the accommodating window side, and the inner circumferential surface of the annular retaining portion has a quadrilateral cross-sectional shape with corners at four locations in the circumferential direction.

[0022] When the two wings of the wing-shaped needle are respectively inserted into the slits provided on both sides of a protective sheet, the tube extending toward the base end of the wing-shaped needle is sometimes pressed against the end of the accommodating window portion of the tube insertion portion. In this case, according to the needle tip protector for the wing-shaped needle formed in accordance with the present embodiment, the inner peripheral surface of the annular retaining portion pressed by the tube is formed into a quadrilateral cross-sectional shape, so that the tube is easily guided toward the corner of the annular retaining portion, and the position of action of the external force generated by the abutment of the tube can be set at the corner of the annular retaining portion. Therefore, it is possible to prevent the external force generated by the abutment of the tube from acting on an undesirable position in the circumferential direction of the needle tip protector, and the protective function of the needle tip can be stably obtained.

[0023] The sixth mode is based on the needle tip protector for the winged needle described in the fifth mode, wherein the tube insertion portion is formed into a divided structure divided in the circumferential direction in such a manner that the four protective sheets are divided into two each, and the corner portion of the inner circumferential surface of the annular retaining portion deviates from the divided portion of the tube insertion portion in the circumferential direction.

[0024] According to the needle tip protector for a winged needle having the structure according to this embodiment, by preventing external force generated by the abutment of the tube from acting on the divided portion of the tube insertion portion, it is possible to prevent the divided portion of the tube insertion portion from accidentally opening due to the external force.

[0025] The seventh method is based on the needle tip protector for the winged needle described in the fifth method or the sixth method, wherein a tube holding surface for holding the tube is provided on the inner surface of the tube insertion portion, and a tube holding groove opening toward the tube is formed at the end of the tube holding surface on the side of the accommodating window portion, and the tube holding groove is located on the base end side of the corner portion of the annular holding portion in the circumferential direction.

[0026] According to the needle tip protector for a winged needle having the structure according to this embodiment, the tube can be prevented from being easily guided to a position other than the corner of the annular holding portion due to the contact with the tube holding surface by using the tube holding groove to position and hold the tube. Therefore, the tube is stably held at the circumferential position of the annular holding portion where the corner is provided.

[0027] The eighth method is a needle tip protector for a winged needle, which protects a winged needle having two wing portions, wherein four protective sheets are arranged in a cylindrical shape, and slits for inserting the wing portions of the winged needle are formed respectively between the circumferential directions of the protective sheets, and four accommodating windows connected to the slits are provided on the base end side of the protective sheet, and a tube insertion portion for inserting a tube connected to the base end side of the winged needle is provided at a position closer to the base end side than the accommodating windows, and a tube holding surface for holding the tube is provided on the inner surface of the tube insertion portion, and a tube holding groove opening toward the tube is formed at the end of the tube holding surface on the side of the accommodating window.

[0028] When the two wings of the winged needle are respectively inserted into the slits provided on both sides of a protective sheet, the tube connected to the winged needle is sometimes pressed against the tube holding surface of the tube insertion portion and moves along the tube holding surface. In this case, according to the needle tip protector for the winged needle formed in accordance with the structure of this embodiment, the tube is positioned and held by the tube holding groove opened on the tube holding surface, so that the position where the tube is pressed against the inner surface of the tube insertion portion can be controlled. Therefore, it is possible to prevent the external force acting on the tube insertion portion from adversely affecting the needle tip protection function of the needle tip protector.

[0029] The ninth method is a needle tip protector for a winged needle, which protects a winged needle having two wing portions, wherein four protective sheets are arranged in a cylindrical shape, and slits for inserting the wing portions of the winged needle are formed in the circumferential direction between these protective sheets, and an inclined portion inclined in the circumferential direction is provided in the middle of the slit, and the slit is formed to be wide at the inclined portion.

[0030] According to the needle tip protector for a winged needle having a structure according to this embodiment, the path of the slit can be set with a large degree of freedom by providing an inclined portion in the middle of the slit. In addition, since the slit is formed to have a wide width at the inclined portion, it is possible to reduce the sliding resistance of the wing of the winged needle when passing through the inclined portion, prevent it from being caught, and enable the wing to move smoothly in the slit.

[0031] The tenth method is a needle tip protector for a winged needle, which protects a winged needle having two wing portions, wherein four protective sheets are arranged in a cylindrical shape, and slits for inserting the wing portions of the winged needle are formed in the circumferential direction between these protective sheets, and four accommodating window portions connected to each of the slits and wider than the slit width in the circumferential direction are provided on the base end side of the protective sheet, and in each of the slits, a widening portion with a locally increased width dimension is provided at a position away from the accommodating window portion toward the front end side.

[0032] According to the needle tip protector for wing-shaped needles formed in accordance with the present embodiment, for example, if the length of the narrow portion of the slit provided between the accommodating window and the widening portion of the slit is shortened, when the wing passes through the narrow portion, the end of the wing is located at the accommodating window or the widening portion, allowing the wing to be tilted relative to the axial direction. Thus, the force acting on the protective sheet from the wing can be reduced, and the protective sheet can be suppressed from being pushed away by the wing.

[0033] The eleventh method is a needle tip protector for a winged needle, which protects a winged needle having two wing portions, wherein four protective sheets are arranged in a cylindrical shape, and slits for inserting the wing portions of the winged needle are formed respectively between the circumferential directions of the protective sheets, and four accommodating windows connected to the slits are provided on the base end side of the protective sheet, and when the two wings are inserted into any two accommodating windows adjacent to each other in the circumferential direction, the axial length of the accommodating window is also greater than the insertion portion of each wing portion inserted into each accommodating window portion, and the insertion portion of the wing portion is accommodated in the accommodating window portion.

[0034] When the wing enters the receiving window through the slit, usually, the connecting portion of the wing enters the receiving window through the slit. However, for example, when the wing enters the receiving window through the slit while being deformed in a skewed manner, the two wings are inserted into the two slits located on both sides of the circumference of a protective sheet, and the insertion state described later is formed in a 3:1 ratio. In such a 3:1 insertion state, the outer portion of each wing having an axial length longer than the portion close to the needle hub may also enter the receiving window from the slit. Therefore, in the needle tip protector for winged needles formed in accordance with the present embodiment, the axial length dimension of the receiving window is made larger than the insertion portion of each wing inserted into the receiving window in the above-mentioned 3:1 insertion state. Therefore, even when the two wings are inserted into the 3:1 ratio described later through the slits adjacent to each other in the circumferential direction, the wings are stably and reliably received in the receiving window, and the return of the wings from the receiving window to the slit is effectively suppressed, thereby stably exerting the effect of preventing the winged needle from being exposed to the front end side again.

[0035] Effects of the Invention

[0036] According to the present invention, it is possible to prevent adverse effects on the function and operation of needle tip protection, which may occur in a needle tip protector for a winged needle having four protection sheets. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a perspective view showing a needle tip protector for a winged needle as a first embodiment of the present invention.

[0038] Figure 2 yes Figure 1 A front view of a needle tip protector for a winged needle is shown.

[0039] Figure 3 yes Figure 1 A top view of a needle tip protector for a winged needle is shown.

[0040] Figure 4 yes Figure 1 A bottom view of a needle tip protector for a winged needle is shown.

[0041] Figure 5 It is a magnified representation Figure 2 Figure 4 is a diagram of a VV cross section.

[0042] Figure 6 It is a magnified representation Figure 2 FIG. 6 is a diagram of the VI-VI section.

[0043] Figure 7 It is a magnified representation Figure 2 Figure VII-VII section.

[0044] Figure 8 The split part is shown open. Figure 1 A three-dimensional view of a needle tip protector for a winged needle.

[0045] Fig. 9 yes Figure 8 A front view of a needle tip protector for a winged needle is shown.

[0046] Fig.10 The assembled state of the wing needle is shown. Figure 1 Front view of a needle tip protector for a winged needle.

[0047] Fig.11 yes Fig.10 The left side view shows a state where the needle tip protector for the winged needle is attached to the winged needle.

[0048] Fig.12 yes Fig.11 XII-XII sectional view.

[0049] Fig.13 It means in Figure 1 A front view of a winged needle in a needle tip protector for a winged needle in a normal state.

[0050] Fig.14 is Fig.13 The needle tip protector for a winged needle shown is a left side view showing a state in which the winged needle is normally accommodated.

[0051] Fig.15 yes Fig.14 XV-XV sectional view.

[0052] Fig.16is Fig.13 The needle tip protector for a winged needle shown is a plan view showing a state in which the winged needle is normally accommodated.

[0053] Fig.17 It means in Figure 1 FIG. 1 is a diagram showing a winged needle in a needle tip protector for a winged needle in which a winged needle is accommodated in a state where the wing portion is biased. Fig.18 View from the XVII direction.

[0054] Fig.18 is Fig.13 The needle tip protector for a winged needle shown is a plan view of a state where the winged needle is accommodated in a state where the wing portion is deflected.

[0055] Fig.19 It is a magnified representation Fig.17 Figure 1 shows the XIX-XIX section of the .

[0056] Fig. 20 It means in Figure 1 A diagram showing a process of accommodating a winged needle in a needle tip protector for a winged needle with the wing portion biased.

[0057] Fig.21 The needle tip protector for the winged needle of the first embodiment Figure 2 Rear view of.

[0058] Fig. 22 The needle tip protector for the winged needle of the first embodiment Fig.11 Rear view of. DETAILED DESCRIPTION

[0059] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0060] exist Figure 1 to Figure 7 FIG. 2 shows a needle tip protector 10 for a winged needle as a first embodiment of the present invention (hereinafter referred to as the needle tip protector 10). The needle tip protector 10 is formed in a cylindrical shape as a whole. Figure 8 , Fig. 9 As shown in FIG. 1 , the needle needle 46 has a split structure consisting of two split bodies 12, 12 divided into half circumferences, and the split bodies 12, 12 are connected as a whole at one end in the circumferential direction by a hinge 14. In the following description, in principle, the front end side refers to the side of the needle tip 50 of the winged needle 46 described later. Figure 2 The upper side in the above description refers to the side of the tube 64 which will become the wing-shaped needle 46 described later. Figure 2 In principle, the axial direction refers to the central axis direction of the cylindrical needle tip protector 10 , and the circumferential direction refers to the circumferential direction of the needle tip protector 10 .

[0061] The hinge 14 connecting the split bodies 12, 12 is provided at the tube insertion portion 16 constituting the base end portion of the needle tip protector 10. The tube insertion portion 16 is formed into a cylindrical shape that can be externally inserted into the tube 64 described later. The base end opening 18 of the tube insertion portion 16 is formed into a substantially oblong shape, and the diameter dimension in the minor axis direction is substantially the same as the outer diameter dimension of the tube 64 described later. A plurality of anti-slip protrusions 19 extending in the circumferential direction are protrudingly formed on the outer peripheral surface of the tube insertion portion 16, for example, when the tube insertion portion 16 is pinched with fingertips to apply axial force, the fingertips are not easy to slide and the force can be easily applied.

[0062] In addition, the tube insertion portion 16 is provided with a fixing mechanism for maintaining the tube insertion portion 16 in a cylindrical shape at a portion radially opposite to the hinge 14. Moreover, the circumferential ends of the split bodies 12, 12 on the side opposite to the hinge 14 overlap each other in the circumferential direction and are connected and fixed by the fixing mechanism, thereby maintaining the tube insertion portion 16 in a cylindrical shape. In this way, the tube insertion portion 16 is formed into a split structure having a circumferentially split portion, the end on one side of the circumference is connected as a whole by the hinge 14, and the end on the other side of the circumference is connected and fixed by the fixing mechanism. The fixing mechanism of this embodiment is formed by inserting a connecting hook 20 protruding outward in the circumferential direction in one split body 12 and having a claw at the front end into a connecting hole 22 provided in the other split body 12 and locking it to the opening peripheral edge of the connecting hole 22.

[0063] The front end of the tube insertion portion 16 is formed as an annular retaining portion 24. The annular retaining portion 24 is continuously provided over the entire circumference, and the outer peripheral surface has a substantially circular cross-sectional shape (a cross-section perpendicular to the axis) and the inner peripheral surface has a substantially quadrilateral cross-sectional shape having four corners 26, 26, 26, 26.

[0064] The inner peripheral surface of the tube insertion portion 16 on the proximal side of the annular holding portion 24 is composed of four tube holding surfaces 28, 28, 28, 28. The tube holding surface 28 is a substantially flat surface, and the inner peripheral surface of the tube insertion portion 16 composed of the four tube holding surfaces 28, 28, 28, 28 has a substantially quadrilateral cross section.

[0065] like Figure 7 to Figure 9 As shown in the figure, a tube holding groove 30 is formed in the tube holding surface 28 of the tube insertion portion 16. The tube holding groove 30 is a groove-shaped recessed portion that opens on the tube holding surface 28 and extends in the axial direction, and is provided at the end portion on the front end side of the tube holding surface 28. The inner surface of the groove of the tube holding groove 30 of the present embodiment is formed as a curved surface with a substantially arc-shaped cross section, but the shape of the inner surface of the groove of the tube holding groove 30 is not particularly limited, and for example, it may be a surface with a polygonal cross section composed of a combination of a plurality of planes.

[0066] In the inner circumferential surface of the tube insertion portion 16, the portion formed by the annular holding portion 24 and the portion formed by the four tube holding surfaces 28, 28, 28, 28 are formed to be oriented 90 degrees in the circumferential direction, and the corner portion 26 of the inner circumferential surface of the annular holding portion 24 is arranged in the circumferential direction at a position aligned in the axial direction with the circumferential center of the tube holding surface 28. In addition, a tube holding groove 30 is provided on the base end side of the corner portion 26 of the inner circumferential surface of the annular holding portion 24, and the inner surface of the groove of the tube holding groove 30 is smoothly continuous without forming a step with respect to the inner circumferential surface of the annular holding portion 24.

[0067] The corners 26, 26, 26, 26 of the annular holding portion 24 and the tube holding grooves 30, 30, 30, 30 are all located at positions that are circumferentially offset relative to the circumferential ends of the split bodies 12, 12, that is, the split positions. In the present embodiment, the circumferential ends of the split bodies 12, 12 (the split positions of the tube insertion portion 16) are located approximately in the center between the corners 26, 26 of the inner circumferential surface of the annular holding portion 24 formed into a substantially quadrilateral cross section, and the distance between the corners 26 and the split position of the tube insertion portion 16 is increased.

[0068] like Figure 1 , Figure 6 As shown, four columnar portions 32, 32, 32, 32 extending from the annular retaining portion 24 toward the front end side are provided at the portion corresponding to the corner portions 26, 26, 26, 26 of the inner circumferential surface of the annular retaining portion 24 in the circumferential direction. The columnar portion 32 is formed into a rod shape extending in a straight line with a substantially constant cross-sectional shape. The cross-sectional shape of the columnar portion 32 of the present embodiment is substantially octagonal, but the cross-sectional shape of the columnar portion 32 is not particularly limited, and may be, for example, circular. The four columnar portions 32, 32, 32, 32 are substantially evenly arranged in the circumferential direction, and two columnar portions 32, 32 are provided in each segment 12. Figure 6 The circumferential angle α of the columnar portion 32 around the central axis of the needle tip protector 10 shown is preferably less than 30 degrees, and more preferably less than 25 degrees. In addition, the circumferential angle α of the columnar portion 32 is preferably more than 10 degrees, and more preferably more than 15 degrees. In addition, the circumferential angle α of the columnar portion 32 around the central axis of the needle tip protector 10 is the angle formed by the tangents at the circumferential ends of the columnar portion 32 passing through the center of the needle tip protector 10. The tangent here not only refers to the case where the cross-sectional shape of the columnar portion 32 has an outer shape composed of curved lines such as a circle and an ellipse, for example, when the cross-sectional shape of the columnar portion 32 is a polygon, it also refers to a straight line that passes only through a point on the outer peripheral surface of the columnar portion 32.

[0069] An accommodation window 34 is formed between the columnar portions 32 and 32 arranged adjacent to each other in the circumferential direction. Figure 2 , Fig. 9As shown, the accommodating window portion 34 is arranged to penetrate radially in a roughly rectangular opening shape, and is formed by surrounding the periphery by the columnar portions 32, 32 on both sides of the circumference, the annular retaining portion 24 on the base end side, and the protective sheet 36 (described later) on the front end side. In the needle tip protector 10, four accommodating windows 34, 34, 34, 34 of roughly the same shape and size are arranged roughly evenly in the circumferential direction, and the accommodating windows 34, 34 adjacent to each other in the circumferential direction are separated by the columnar portion 32. The wall portion on the base end side of the accommodating window portion 34 is composed of the annular retaining portion 24, and the tube insertion portion 16 is located at a position closer to the base end side than the accommodating window portion 34.

[0070] like Figure 1 , Figure 2 , Figure 8 , Fig. 9 As shown in the figures, a protective sheet 36 is provided on the front end side of the columnar portion 32. The protective sheet 36 is formed into a plate shape that is curved into an arc shape in the circumferential direction and has a width dimension of about 1 / 4 of the circumference in the circumferential direction. The protective sheet 36 is formed into a pointed shape in which the width becomes narrower in the circumferential direction toward the front end. The front end portion of the protective sheet 36 is curved in such a way that the end surface on one side of the circumferential direction is formed into a convex shape and the end surface on the other side of the circumferential direction is formed into a concave shape. The center of the circumferential direction of the portion of the protective sheet 36 that is closer to the front end side than the inclined portion 44 of the slit 38 described later is located on the extension line of the columnar portion 32 to the front end side. The front end portion of the protective sheet 36 is formed into a curved shape corresponding to the curved portion 40 of the slit 38, but as a whole, the center of the circumferential direction is located on the extension line of the columnar portion 32. In particular, between the inclined portion 44 and the curved portion 40 and at the portion closer to the front end side than the curved portion 40, the center of the circumferential direction of the protective sheet 36 is located on the extension line of the columnar portion 32.

[0071] Two protective sheets 36 are provided on each of the two split bodies 12, 12. In the entire needle tip protector 10, four protective sheets 36, 36, 36, 36 are arranged in a circumferential direction, and these four protective sheets 36, 36, 36, 36 are formed into a cylindrical shape. The columnar portion 32 extends from each protective sheet 36 toward the base end side, and the protective sheet 36 and the tube insertion portion 16 are connected by the columnar portion 32. In the present embodiment, the tube insertion portion 16, the columnar portion 32 and the protective sheet 36 are integrally formed of a synthetic resin or the like, but they can also be formed as independent components and fixed to each other. With respect to the position Figure 5 The middle portion of the protective sheet 36 between the curved front end portion of the cross-sectional shape and the axial direction of the inclined portion 44 of the slit 38 described later is shown in FIG. Figure 6 The columnar portion 32 having a cross-sectional shape shown in FIG. is located approximately in the center in the circumferential direction. Figure 5 , Figure 6 As shown, the middle portion of the protection sheet 36 and the columnar portions 32 are arranged substantially evenly in the circumferential direction.

[0072] A slit 38 is formed between the circumferentially adjacent protective sheets 36, 36. The slit 38 extends continuously from the front end to the base end of the protective sheet 36 over the entire length. The front end of the slit 38 is open to the front end side between the protective sheets 36, 36. In the present embodiment, the front end portion of the protective sheet 36 narrows in width in the circumferential direction toward the front end, and the front end side of the slit 38 expands in the circumferential direction toward the front end. In addition, a portion of the front end portion of the protective sheet 36 is formed in a curved shape, whereby the front end portion of the slit 38 is formed as a curved portion 40 extending in a curved manner.

[0073] The base end of the slit 38 is connected to the accommodating window 34. The accommodating window 34 is formed to be wider than the base end of the slit 38, and in the present embodiment, is formed to be wider than the inclined portion 44 described later, which is locally wider in the slit 38. The base end of the slit 38 is located at a position deviated from the circumferential ends of the accommodating window 34 in the circumferential direction. The circumferential ends of the protective sheet 36 protrude from the columnar portion 32 to the circumferential sides to form the anti-slip portions 42, 42, and the slit 38 is connected to the accommodating window 34 between the anti-slip portions 42, 42 of the circumferentially adjacent protective sheets 36, 36. The wall portion on the front end side of the accommodating window 34 is formed by the anti-slip portion 42, and is located at a position closer to the base end side than the protective sheet 36. In addition, the base end of the slit 38 is provided at a position deviated from the circumferential center of the accommodating window 34. Therefore, the projection dimensions of the retaining portions 42 , 42 located on both sides of the slit 38 in the circumferential direction from the columnar portion 32 in the circumferential direction are different from each other.

[0074] In the present embodiment, the front end of the slit 38 is arranged at a circumferential position corresponding to the circumferential center of the accommodating window portion 34. The base end of the slit 38 is provided with an inclined portion 44 inclined in the circumferential direction in the middle of the slit 38, thereby being located at a position deviated from the center of the accommodating window portion 34 in the circumferential direction. In short, the two sides of the slit 38 relative to the length direction of the inclined portion 44 are located at positions staggered from each other in the circumferential direction. In addition, each slit 38 has a straight portion extending linearly from the inclined portion 44 in the axial direction on the front end side and the base end side of the inclined portion 44, respectively. The inclined portion 44 of the slit 38 is inclined in the circumferential direction relative to the axial direction, and in the present embodiment, extends linearly at a substantially constant inclination angle. The inclined portion 44 is arranged to be smoothly continuous with the two axial sides of the slit 38 that deviate from the inclined portion 44. Therefore, no sharp angle is formed on the inner surface of the wall of the slit 38.

[0075] The distance between the opposing surfaces of the inner wall surface of the slit 38, i.e., the width dimension, is larger in the inclined portion 44 than in other portions, and the widening portion of the present embodiment is formed in the inclined portion 44. The width dimension of the slit 38 in the inclined portion (widening portion) 44 is preferably such that the wing 58 (connecting portion 60) of the wing-shaped needle 46 described later can be accommodated in the inclined portion 44 when the wing 58 passes through, and is preferably larger than the axial dimension of the insertion portion (connecting portion 60) of the wing 58 inserted into the slit 38. The axial dimension of the inclined portion 44 is preferably less than half of the axial length of the protective sheet 36, and more preferably less than 1 / 3. The inclined portion 44 in the slit 38 is provided at a position away from the accommodation window 34 toward the front end side, and the portion of the slit 38 located between the inclined portion 44 and the accommodation window 34 is narrowed by the anti-detachment portions 42, 42, and is formed to be narrower in width than the inclined portion 44.

[0076] The inclined portion 44 is preferably located closer to the base end side than the axial center of the protection sheet 36. The axial center of the inclined portion 44 is preferably located within a range of 1 / 3 of the axial dimension of the protection sheet 36 from the base end of the protection sheet 36, and more preferably within a range of 1 / 4 of the axial dimension of the protection sheet 36 from the base end of the protection sheet 36.

[0077] like Figure 10 to Figure 12 As shown, the needle tip protector 10 is used by being attached to a winged needle 46. The winged needle 46 has a puncture needle 48. The puncture needle 48 is formed of medical stainless steel or the like, and has a needle tip 50 at the front end. The puncture needle 48 may be solid, but is a hollow needle in this embodiment.

[0078] A needle hub 52 is fixed to the base end of the puncture needle 48. The needle hub 52 is formed in a cylindrical shape and fixed to the base end of the puncture needle 48. In addition, two wings 58, 58 protruding outward from the needle hub 52 are provided integrally with the needle hub 52.

[0079] The wing portion 58 is formed in a plate shape and is arranged to contact the needle hub 52 formed in a substantially circular cross section. Therefore, the wing portion 58 is arranged at a position offset in one direction of the radial direction of the needle hub 52 (the plate thickness direction of the wing portion 58) relative to the central axis of the needle hub 52. The wing portion 58 includes a connecting portion 60 protruding outward from the needle hub 52 and a wing body 62 continuously arranged on the outer side of the connecting portion 60. The axial length dimension of the wing body 62 is larger than the axial length dimension of the connecting portion 60. In the wing portion 58, the connecting portion 60 is arranged to be connected to the front end portion of the needle hub 52, and the needle hub 52 protrudes toward the base end side than the connecting portion 60. In the wing portion 58 of the present embodiment, the connecting portion 60 and the wing body 62 are formed to have a substantially constant thickness dimension, but the thickness dimensions of the connecting portion 60 and the wing body 62 may be different from each other. For example, by making the connecting portion 60 thinner than the wing body 62, the wing portion 58 can be easily bent and deformed at the connecting portion 60, and the connecting portion 60 of the wing portion 58 can be easily inserted into the slit 38.

[0080] like Fig.10 As shown, the axial length dimension L1 of the accommodation window portion 34 in the needle tip protector 10 is larger than the axial length dimension L2 of the end portion on the connecting portion 60 side of the wing body 62. In addition, it is preferable that the axial length dimension L1 of the accommodation window portion 34 is 1.5 times or less relative to the axial length dimension L2 of the end portion on the connecting portion 60 side of the wing body 62, so that the insertability of the wing portion 58 into the accommodation window portion 34 can be ensured while preventing the needle tip protector 10 from being excessively enlarged.

[0081] The needle hub 52 is provided with a tube 64. The tube 64 is made of an elastic material such as a resin elastomer, has flexibility, and allows changes in the cross-sectional shape. The front end portion of the tube 64 is attached to the needle hub 52 in an externally inserted state. The tube 64 is preferably fixed by bonding, welding, or the like.

[0082] like Figure 10 to Figure 12 As shown, the needle tip protector 10 is installed in the tube 64 in an externally inserted state. In other words, the tube 64 is inserted into the needle tip protector 10 formed in a cylindrical shape, and the puncture needle 48 and the needle hub 52 are arranged at a position closer to the front end side than the needle tip protector 10. The tube 64 is inserted into the tube insertion portion 16 of the needle tip protector 10, and contacts with the inner circumferential surface of the tube insertion portion 16 composed of the tube holding surfaces 28, 28, 28, 28 and the inner circumferential surface of the base end opening portion 18 of the tube insertion portion 16 to be positioned and held. In addition, when the needle tip protector 10 is assembled to the tube 64, the tube holding groove 30 opens toward the inner circumferential side of the tube 64.

[0083] The winged needle 46 punctures the puncture needle 48 into the patient's blood vessel, for example, during infusion, dialysis, etc. Then, the infusion bag, dialysis device, etc., not shown, connected to the tube 64, is connected to the patient's blood vessel via the winged needle 46 to perform, for example, blood collection, blood return (blood transfusion), medication (infusion), etc. In the winged needle 46, the two wings 58, 58 can be bent at each connection portion 60 in a direction to be wrapped in the needle hub 52, and the two wings 58, 58 can be pinched while overlapping each other to perform puncture. In addition, when the puncture needle 48 is punctured in the blood vessel, the two wings 58, 58 can be fixed to the patient's skin with tape, etc., so that the winged needle 46 can be retained in the state where the puncture needle 48 punctures the blood vessel.

[0084] The puncture needle 48 of the winged needle 46 is pulled out from the patient's blood vessel after use. Figure 13 to Figure 15 As shown, puncture needle 48 is housed in needle tip protector 10 and protected.

[0085] That is, for example, the doctor or the like pulls the tube 64 toward the proximal side while holding the needle tip protector 10 for positioning by hand, and thereby removes the winged needle 46 from the blood vessel. By pulling the winged needle 46 toward the proximal side while positioning the needle tip protector 10, the removed winged needle 46 moves toward the proximal side (proximal position) relative to the needle tip protector 10, and approaches the needle tip protector 10 from the distal side. In other words, the needle tip protector 10 moves relative to the winged needle 46 toward the needle tip 50 side.

[0086] The wing portion 58 of the wing-shaped needle 46 approaches the needle tip protector 10 in the axial direction from the front end side and is inserted into the slit 38 of the needle tip protector 10. The wing body 62 of the wing portion 58 may also be inserted into the slit 38, but in this embodiment, by inserting the connecting portion 60 with a shortened axial dimension into the slit 38, the contact area between the wing portion 58 and the protective sheet 36 becomes smaller, and the sliding resistance when the wing portion 58 moves in the slit 38 is reduced.

[0087] Usually, if Fig.16 As shown in FIG. 1 , two wings 58, 58 are inserted into the slits 38, 38 on both radial sides of the needle tip protector 10. In this case, two protective sheets 36, 36 are located between the wing 58 of one of the two wings 58, 58 inserted into the slits 38, 38 in the circumferential direction, and the other two protective sheets 36, 36 are located between the wing 58 of the other of the two wings 58, 58 in the circumferential direction. Such an insertion configuration of the two wings 58, 58 into the slits 38, 38 is referred to as 2:2 insertion.

[0088] Since the front end portion of the protection sheet 36 is formed in a pointed shape, the wing portion 58 abutting against the front end portion of the protection sheet 36 is guided to the slit 38. The wing portion 58 has a thickness dimension greater than a width dimension of the portion of the slit 38 that is offset from the inclined portion 44, and moves toward the base end side in the slit 38 while expanding the slit 38. In addition, when the wing portion 58 passes through the curved portion 40 provided at the front end portion of the slit 38, the slit 38 is expanded further.

[0089] like Figure 13 to Figure 15 As shown, the wing 58 after passing through the slit 38 is inserted into the accommodation window 34. In addition, when the wing 58 is accommodated in the accommodation window 34, the puncture needle 48 is located on the inner peripheral side of the protective sheets 36, 36, 36, 36, and is protected by the protective sheets 36, 36, 36, 36, which surround the puncture needle 48 over the entire circumference. In this way, it is possible to avoid accidental contact with the needle tip 50 of the puncture needle 48, and the puncture needle 48 after use is not easily visible from the outside.

[0090] When the puncture needle 48 is protected by the needle tip protector 10, the relative movement of the winged needle 46 toward the front end side relative to the needle tip protector 10 is restricted. That is, the front end of the slit 38 through which the wing 58 passes opens at a circumferential position roughly corresponding to the circumferential center of the accommodation window 34, and the base end is connected to the accommodation window 34 at a position deviating from the circumferential center of the accommodation window 34. As a result, when the wing 58 passes through the base end of the slit 38, a force in a twisting direction and the like is applied to the winged needle 46, and this force is released by the wing 58 entering the accommodation window 34, and the wing 58 is located at the approximate center of the circumference in the accommodation window 34. Therefore, even if a force is applied to move the winged needle 46 toward the front end side relative to the needle tip protector 10, the wing 58 is not easy to enter the slit 38, and the wing 58 abuts against the anti-detachment portion 42 to prevent the winged needle 46 from moving toward the front end side relative to the needle tip protector 10. Therefore, it is possible to prevent puncture needle 48 from protruding again to a position closer to the distal end side than needle tip protector 10 and being exposed, thereby preventing puncture needle 48 from causing an accidental puncture after use.

[0091] Incidentally, if Figure 17 to Figure 19 As shown, the two wings 58, 58 of the winged needle 46 may be inserted into the slits 38, 38 on both sides of one protective sheet 36 of the needle tip protector 10. In this case, one protective sheet 36 is located between the wing 58 of one of the two wings 58, 58 inserted into the slits 38, 38 in the circumferential direction, and the other three protective sheets 36, 36, 36 are located between the wing 58 of the other of the two wings 58, 58 in the circumferential direction. Such an insertion form in which the two wings 58, 58 are inserted into the slits 38, 38 is called a 3:1 insertion.

[0092] When the two wings 58 , 58 are inserted into the slits 38 , 38 at a 3:1 ratio, the two wings 58 , 58 are deformed to approach each other on one side in the circumferential direction, so that the elastic restoring force of the two wings 58 , 58 acts on each protective sheet 36 constituting the wall portion of the slits 38 , 38 .

[0093] In addition, there is a case where the wing 58 is deformed by the abutting reaction force against the protection sheet 36, and the wing 58 is deformed obliquely, and the axial length dimension of the wing 58, such as the end portion on the connection portion 60 side of the wing body 62, is longer than the needle hub 52 side portion (connection portion 60) and is inserted into the slit 38. In the needle tip protector 10, the axial length dimension L1 of the accommodation window 34 is larger than the insertion portion of the wing 58 into the accommodation window 34 assumed in the above-mentioned 3:1 insertion form, so even in the case of the 3:1 accommodation form, the insertion portion of the wing 58 does not get caught on the opening peripheral portion of the accommodation window 34, and can be stably accommodated in the accommodation window 34. In addition, in the present embodiment, the axial length dimension L1 of the accommodation window 34 is set to be larger than the axial length dimension L2 of the end portion on the connection portion 60 side of the wing body 62 or the axial length dimension of the wing body 62.

[0094] In addition, the two wings 58, 58 inserted into the accommodating windows 34, 34 are pressed against the columnar parts 32, 32 and are located at the circumferential ends of the accommodating windows 34, 34. The slit 38 is connected to the accommodating window 34 at a position deviated from the circumferential ends of the accommodating window 34. Therefore, even if the wing-shaped needle 46 wants to move toward the front end side relative to the needle tip protector 10, the wings 58 located at the circumferential ends of the accommodating window 34 abut against the anti-detachment parts 42 of the protection sheet 36 provided on both circumferential sides of the slit 38, and it is difficult for the wings 58 to enter the slit 38 from the accommodating window 34. As a result, the wing-shaped needle 46 is prevented from moving toward the front end side relative to the needle tip protector 10, and the puncture needle 48 of the wing-shaped needle 46 is difficult to protrude toward the front end side of the needle tip protector 10, thereby preventing the needle tip 50 from being exposed again and causing puncture errors.

[0095] In the case of 3:1 insertion, the wing portion 58 may be pressed against the columnar portion 32 while being accommodated in the accommodation window portion 34. Figure 6 As shown, the circumferential angle α of the columnar portion 32 around the central axis of the needle tip protector 10 of the present embodiment is less than 30 degrees, and the circumferential width dimension is small, so the circumferential width dimension of the accommodating window portion 34 is large, and the circumferential movable range of the wing portion 58 in the accommodating window portion 34 is ensured to be large. Therefore, compared with the case where the circumferential width dimension of the columnar portion is large and the circumferential width dimension of the accommodating window portion is small, the contact force of the wing portion 58 against the columnar portion 32 is reduced, and the displacement amount of the protective sheet 36 continuous with the columnar portion 32 is suppressed. Therefore, the four protective sheets 36, 36, 36, 36 are maintained in a state of being arranged in a cylindrical shape, and the puncture needle 48 is prevented from being exposed to the outside from between these protective sheets 36, 36, 36, 36.

[0096] By setting the circumferential angle α of columnar portion 32 to be greater than 10 degrees, necessary deformation rigidity is ensured, displacement of protection sheet 36 accompanying deformation of columnar portion 32 is suppressed, and the state where puncture needle 48 is protected by protection sheets 36, 36, 36, 36 is stably maintained.

[0097] In addition, during the insertion at a ratio of 3:1, the abutting reaction force between the wing portion 58 and the needle tip protector 10 acts on the winged needle 46, whereby the winged needle 46 is sometimes accommodated in the needle tip protector 10 while being tilted. In this case, it is considered that the tube 64 abuts against the inner peripheral surface of the annular holding portion 24 of the tube insertion portion 16. In the needle tip protector 10 of the present embodiment, since the inner peripheral surface of the annular holding portion 24 has a square cross-sectional shape, the tube 64 pressed against the inner peripheral surface of the annular holding portion 24 is easily held by the corner portion 26 of the annular holding portion 24. The corner portion 26 of the annular holding portion 24 is arranged at a position shifted by approximately 90 degrees in the circumferential direction with respect to the split position of the tube insertion portion 16 formed by combining the split bodies 12, 12. Therefore, even if the tube 64 held by the corner 26 of the annular holding portion 24 is pressed against the annular holding portion 24, the force generated by the abutment is unlikely to act directly on the split position of the split bodies 12, 12, thereby preventing the split bodies 12, 12 from being pushed apart.

[0098] Furthermore, in the insertion at a ratio of 3:1, there is also a case where the tube 64 is pressed against the tube holding surface 28 constituting the inner surface of the tube insertion portion 16 at a position closer to the base end side than the annular holding portion 24. Since the angle between the two tube holding surfaces 28, 28 is located at the divided portion of the divided bodies 12, 12, there is a risk that the tube 64 guided to the angle along the tube holding surface 28 pushes the divided portion of the divided bodies 12, 12 apart. Therefore, in the present embodiment, a tube holding groove 30 is formed at the end of the front end side of the tube holding surface 28 where the tube 64 may abut, a part of the outer peripheral surface of the tube 64 enters the tube holding groove 30, and the tube 64 is positioned and held relative to the needle tip protector 10 in the circumferential direction of the needle tip protector 10. Therefore, the tube 64 is not easily guided to the divided portion of the divided bodies 12, 12 due to abutment with the tube holding surface 28, and it is possible to prevent the divided bodies 12, 12 from being pushed apart due to the tube 64 being pressed against the divided portion of the divided bodies 12, 12.

[0099] The corner 26 of the annular retaining portion 24 and the tube retaining groove 30 of the tube retaining surface 28 are arranged at substantially the same position in the circumferential direction and are continuous in the axial direction. Therefore, the circumferential positioning function of the tube 64 can be more effectively exerted, and the tube 64 is not easily pressed against the divided parts of the divided bodies 12, 12.

[0100] In addition, in the 3:1 insertion, if the slit has an inclined portion or a curved portion, when the wing 58 passes through this portion, the wing 58 is strongly pressed against the inner surface of the slit wall (protective sheet), and there is a risk that the wing 58 will have difficulty passing through the slit, or the protective sheet will be greatly deformed, which will have an adverse effect on the protective function. Therefore, in this embodiment, in the inclined portion 44 provided in the middle of the slit 38, the slit 38 is formed into a widened portion with a wide local width, which reduces the contact force between the inner surface of the slit 38 wall and the wing 58 when the wing 58 passes through the inclined portion 44. That is, Fig. 20 As shown, the wing 58 of the inclined portion 44 is accommodated in the inclined portion 44 having a wider width, thereby preventing excessive deformation of the wing 58 due to the inclination of the slit 38 or excessive deformation of the protection sheet 36 due to the contact between the wing 58 and the inclined portion 44 of the slit 38. Therefore, the sliding resistance when the wing 58 passes through the inclined portion 44 of the slit 38 is reduced, and the wing 58 easily passes through the slit 38 having the inclined portion 44, and the force acting on the protection sheet 36 when the wing 58 passes through the inclined portion 44 of the slit 38 is reduced, so that the four protection sheets 36, 36, 36, 36 can be maintained in a cylindrical configuration.

[0101] In addition, the inclined portion 44 partially formed as a wide slit 38 is provided at a position away from the front end side relative to the accommodation window 34, and a narrow portion formed by the anti-detachment portions 42, 42 is provided between the inclined portion 44 formed as a wide width and the accommodation window 34. Through the narrow portion, the wing portion 58 inserted into the accommodation window 34 is not easy to return to the slit 38. Moreover, the axial length dimension of the narrow portion is smaller than the axial length dimension L2 of the end portion on the connecting portion 60 side of the wing body 62 passing through the slit 38 during the insertion of 3:1. When the end portion on the connecting portion 60 side of the wing body 62 passes through the narrow portion, the inclination of the wing body 62 is allowed by at least one of the inclined portion 44 and the accommodation window 34. As a result, the contact pressure between the wing body 62 and the protective sheet 36 when passing through the narrow portion is suppressed, the degree of opening of the protective sheet 36 is reduced, and the resistance when the wing-shaped needle 46 is accommodated in the needle tip protector 10 is reduced.

[0102] Furthermore, when the winged needle 46 is protected by the needle tip protector 10, the inclined portion 44 is located closer to the base end side than the needle tip 50 of the puncture needle 48. Thus, even if the puncture needle 48 is tilted relative to the needle tip protector 10, the needle tip 50 will not be exposed to the side through the wide inclined portion 44, and accidental puncture by the needle tip 50 can be prevented.

[0103] In addition, in the above-mentioned embodiment, Figures 17 to 20, an example of the 3:1 insertion configuration of the wings 58, 58 relative to the needle tip protector 10 is shown, but the wings 58, 58 inserted in the 3:1 configuration can also exert the above-mentioned effects even if they are inserted into two accommodating windows 34, 34 adjacent in the circumferential direction across any columnar portion 32. Furthermore, the wings 58, 58 can also be bent to either side in the circumferential direction relative to the puncture needle 48, for example, Fig.19 In the embodiment, the two wings 58, 58 are formed to be bent downward to the left and right relative to the puncture needle 48, but the two wings 58, 58 may be formed to be bent upward to the left and right relative to the puncture needle 48. Even in such a 3:1 insertion form relative to the needle tip protector 10, the above-mentioned effects can be exerted in the same manner. In addition, in consideration of the puncture operation of the puncture needle 48 into the human body, a thin-walled portion extending in the axial direction of the connecting portion 60 may be provided on the wing 58. Even if a thin-walled portion thinner than the wing body 62 is provided on the connecting portion 60 by such a thin-walled portion, the above-mentioned effects of the present invention can be effectively exerted.

[0104] The embodiments of the present invention are described in detail above, but the present invention is not limited to the specific description. For example, the split bodies 12, 12 constituting the needle tip protector 10 do not need to be connected by the hinge 14 at one end in the circumferential direction. Specifically, for example, by fixing the split bodies 12, 12 independent of each other at both ends in the circumferential direction, a split structure needle tip protector can also be formed.

[0105] In addition, the fixing mechanism for fixing the split bodies 12, 12 to each other is not limited to the structure in which the connecting hook 20 having a claw at the front end is locked to the peripheral portion of the connecting hole 22. Specifically, for example, the fixing mechanism can also be formed by fitting the convex portion of one split body 12 with the concave portion of the other split body 12, or by means of welding, bonding, etc.

[0106] In the above-mentioned embodiment, only one inclined portion 44 is provided in the middle of the slit 38, but for example, a plurality of inclined portions may be provided in the middle of the slit 38. When a plurality of inclined portions are provided, it is preferred that the slit 38 be formed to have a wide width in each inclined portion, but it is not necessary to form the slit 38 to have a wide width in all inclined portions. For example, a wide width inclined portion and a non-wide width inclined portion may be mixed. In addition, the inclination angles of the plurality of inclined portions may be different from each other. The inclined portion is not limited to an inclined shape of a straight line with a substantially constant inclination angle, and may be, for example, a curved inclined shape with a continuously changing inclination angle, an inclined shape of a broken line with a continuously changing inclination angle, etc.

[0107] The structure of the wing-shaped needle 46 can be changed appropriately. For example, the tube 64 can also be fixed to the needle hub 52 in an inserted state. In addition, the shape of the wing portion 58 is not limited, and for example, the wing portion 58 can also have substantially the same axial dimensions as a whole. Furthermore, the wing portion 58 can also have a pleated anti-slip member on the surface that is pinched by the fingers during puncture, and can also have a loosely fitted alignment portion on the surface that overlaps each other during puncture, or a display indicating the thickness of the puncture needle 48 can be performed.

[0108] In the above-mentioned embodiment, the needle tip protector 10 having any one of the structures involved in the first embodiment, the structure involved in the third embodiment, the structure involved in the fifth embodiment, the structure involved in the eighth embodiment, the structure involved in the ninth embodiment, the structure involved in the tenth embodiment, and the structure involved in the eleventh embodiment is shown as an example, but the structures involved in the first embodiment, the structures involved in the third embodiment, the structures involved in the fifth embodiment, the structure involved in the eighth embodiment, the structure involved in the ninth embodiment, the structure involved in the tenth embodiment, and the structure involved in the eleventh embodiment may be adopted by only any one or by combining selected structures.

[0109] Description of Reference Numerals

[0110] 10: Needle tip protector for winged needle;

[0111] 12: segmentation;

[0112] 14: Hinge;

[0113] 16: pipe insertion portion;

[0114] 18: base end opening;

[0115] 19: Anti-slip protrusions;

[0116] 20: connecting hook;

[0117] 22: connection hole;

[0118] 24: annular retaining portion;

[0119] 26: Corner;

[0120] 28: Tube holding surface;

[0121] 30: tube holding groove;

[0122] 32: columnar part;

[0123] 34: accommodating window portion;

[0124] 36: protective film;

[0125] 38: Slit;

[0126] 40: bending part;

[0127] 42: anti-falling part;

[0128] 44: inclined portion (widened portion);

[0129] 46: pterygoid needle;

[0130] 48: puncture needle;

[0131] 50: needle tip;

[0132] 52: needle hub;

[0133] 58: Wing;

[0134] 60: connection part;

[0135] 62: Wing body;

[0136] 64: tube.

Claims

1. A needle tip protector for a winged needle, which protects a winged needle having two wings. in, The four protective sheets are arranged in a cylindrical shape. Slits into which the wings of the wing-shaped needles can be inserted are respectively formed between the protective sheets in the circumferential direction. Four receiving windows connected to the slits are provided on the base end side of the protection sheet. The slit is connected to the accommodation window portion at a position deviated from the center and both ends of the circumferential direction of the accommodation window portion.

2. The needle tip protector for a winged needle according to claim 1, in, An inclined portion inclined in the circumferential direction is provided in the middle of the slit, and the slits are located at positions offset from each other in the circumferential direction on both sides of the inclined portion.

3. A needle tip protector for a winged needle, which protects a winged needle having two wings. in, The four protective sheets are arranged in a cylindrical shape. Slits into which the wings of the wing-shaped needles can be inserted are respectively formed between the protective sheets in the circumferential direction. Four receiving windows connected to the slits are provided on the base end side of the protective sheet. A columnar portion is provided between the accommodating windows in the circumferential direction, extending from the protective sheet toward the base end side, and partitioning the accommodating windows adjacent to each other in the circumferential direction. The circumferential angle of the columnar portion around the central axis is 30 degrees or less.

4. The needle tip protector for a winged needle according to claim 3, in, The circumferential angle of the columnar portion is greater than 10 degrees.

5. A needle tip protector for a winged needle, which protects a winged needle having two wings. in, The four protective sheets are arranged in a cylindrical shape. Slits into which the wings of the wing-shaped needles can be inserted are respectively formed between the protective sheets in the circumferential direction. Four receiving windows connected to the slits are provided on the base end side of the protective sheet. A tube insertion portion for inserting a tube connected to the base end of the wing-shaped needle is provided at a position closer to the base end than the accommodating window portion. An annular holding portion is provided at the end of the tube insertion portion on the accommodating window portion side and is continuous over the entire circumference. The inner circumferential surface of the annular holding portion has a quadrilateral cross-sectional shape having corners at four locations in the circumferential direction.

6. The needle tip protector for a winged needle according to claim 5, in, The tube insertion portion is formed into a divided structure divided in the circumferential direction in such a manner that the four protection sheets are divided into two each. The corner portion of the inner peripheral surface of the annular holding portion is offset from the dividing portion of the tube insertion portion in the circumferential direction.

7. The needle tip protector for a winged needle according to claim 5 or 6, in, A tube holding surface for holding the tube is provided on the inner surface of the tube insertion portion. A tube holding groove opening toward the tube is formed at the end of the tube holding surface on the side of the accommodating window portion, The tube holding groove is located on the base end side of the corner portion of the annular holding portion in the circumferential direction.

8. A needle tip protector for a winged needle, which protects a winged needle having two wings. in, The four protective sheets are arranged in a cylindrical shape. Slits into which the wings of the wing-shaped needles can be inserted are respectively formed between the protective sheets in the circumferential direction. Four receiving windows connected to the slits are provided on the base end side of the protective sheet. A tube insertion portion for inserting a tube connected to the base end of the wing-shaped needle is provided at a position closer to the base end than the accommodating window portion. A tube holding surface for holding the tube is provided on the inner surface of the tube insertion portion. A tube holding groove opening toward the tube is formed at an end portion of the tube holding surface on the accommodating window portion side.

9. A needle tip protector for a winged needle, which protects a winged needle having two wings. in, The four protective sheets are arranged in a cylindrical shape. Slits into which the wings of the wing-shaped needles can be inserted are respectively formed between the protective sheets in the circumferential direction. An inclined portion inclined in the circumferential direction is provided in the middle of the slit. And the slit is formed to have a wide width at the inclined portion.

10. A needle tip protector for a winged needle, which protects a winged needle having two wings. in, The four protective sheets are arranged in a cylindrical shape. Slits into which the wings of the wing-shaped needles can be inserted are respectively formed between the protective sheets in the circumferential direction. Four receiving windows are provided on the base end side of the protection sheet, which are connected to the slits and are wider than the slits in the circumferential direction. In each of the slits, a widened portion having a partially increased width dimension is provided at a position away from the accommodating window portion toward the front end side.

11. A needle tip protector for a winged needle, which protects a winged needle having two wings. in, The four protective sheets are arranged in a cylindrical shape. Slits into which the wings of the wing-shaped needles can be inserted are respectively formed between the protective sheets in the circumferential direction. Four receiving windows connected to the slits are provided on the base end side of the protection sheet. When the two wings are inserted into any two circumferentially adjacent receiving windows, the axial length of the receiving window is larger than the insertion portion of each wing inserted into the receiving window, and the insertion portion of the wing is received in the receiving window.

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