JP2013192738A - Medical needle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a medical needle capable of reliably preventing a needle body from being projected again from a protector after the needle body is stored.SOLUTION: A medical needle 10 includes: a needle body 12 having a needle tip 12a at the distal end; a shaft 24 provided on the proximal end of the needle body 12; a storage cylinder 16 surrounding the shaft 24, on the inner side of which the shaft 24 is disposed so as to be displaced in an axial direction; and a lock member 18 fixed to the storage cylinder 16 and provided with an engaging part 62 which can be engaged with the shaft 24. The shaft 24 can be slid, with respect to the storage cylinder 16, from a first position at which the distal end of the needle body 12 is projected from the storage cylinder 16 for a prescribed length to a second position at which the distal end of the needle body 12 is stored inside the storage cylinder 16. When the shaft 24 is moved to the second position, the engaging part 62 of the lock member 18 is engaged with the shaft 24, and thus, the shaft 24 is locked at the second position with respect to the storage cylinder 16.

Description

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

  In blood collection, blood transfusion, infusion, etc., there are known medical needles that are used by connecting to blood collection devices such as blood bags, blood processing circuits (component blood collection circuits, hemodialysis circuits, etc.), blood transfusion sets, infusion sets, and the like. Such a medical needle is generally composed of a needle body having a sharp needle tip at the tip and a hub provided at the proximal end of the needle body. When the used medical needle is discarded, it is necessary to cover the needle body in order to prevent the discard operator from inadvertently touching the needle body. Therefore, conventionally, a medical needle provided with a protector that can cover the needle body after use has been proposed (see, for example, Patent Document 1 below).

  A winged indwelling needle (medical needle) disclosed in Patent Document 1 includes a cannula (needle body), a hub provided at the proximal end of the cannula, and a holding cylinder (protector) that accommodates and holds the hub therein. The tip of the needle body supported by the hub is slidable along the inner wall of the protector from a first position where the tip of the needle body protrudes from the protector tip to a second position where the needle body is accommodated in the protector. In between, there is provided first engaging means for releasably locking the hub in the first position of the protector and second engaging means for releasably locking the hub in the second position of the protector. It has been.

Japanese Patent No. 3134920

  The second engaging means in the medical needle according to the above-described prior art is composed of a convex portion provided on the hub and an elastic engaging piece provided on the protector, and the hub is in the axial direction with respect to the protector. The needle body is prevented from projecting again from the protector after the needle body is stored in the protector.

  However, in the related art, the elastic engagement piece is integrally formed as a part of the protector with a resin material, and when an excessive load is applied to the elastic engagement piece from the hub, the elastic engagement piece is There is a possibility of breaking by deforming beyond the elastic limit. When the elastic engagement piece breaks, the locking function in the axial direction between the hub supporting the needle body and the protector is lost, so that the needle body may protrude from the protector again.

  The present invention has been made in consideration of such problems, and in a medical needle that can accommodate the needle body in the protector after use, it is ensured that the needle body re-projects from the protector after the needle body is stored. An object is to provide a medical needle that can be prevented.

  In order to achieve the above object, a medical needle according to the present invention includes a needle body having a needle tip at a distal end, a shaft provided at a proximal end of the needle body, the shaft surrounding the shaft, and the shaft inside. A housing cylinder disposed so as to be displaceable in an axial direction; and a lock member fixed to the housing cylinder and having an engaging portion engageable with the shaft, wherein the shaft is relative to the housing cylinder, The tip of the needle body is slidable from a first position where the tip of the needle body protrudes a predetermined length from the housing cylinder to a second position where the tip of the needle body is housed in the housing cylinder, and the shaft is When the shaft is moved to the position, the engagement portion of the lock member is engaged with the shaft, so that the shaft is locked at the second position with respect to the housing cylinder. .

  According to said structure, the lock member which latches a shaft in a 2nd position with respect to the storage cylinder which functions as a protector is comprised as a member different from a storage cylinder, and it accommodates as a material of a lock member. A material having a strength higher than that of the cylinder can be employed. Therefore, by giving the lock member the necessary strength, it is possible to prevent or suppress the lock member from being damaged after the needle body is accommodated in the accommodation cylinder, whereby the needle body protrudes again from the accommodation cylinder (protector). The possibility of doing so can be greatly reduced.

  In the above medical needle, the lock member may be made of metal.

  According to the above configuration, an excessive load is applied to the engaging portion of the lock member from the shaft, and even if the engaging portion of the lock member is deformed beyond the elastic limit, the engaging portion is not broken. The needle body can be reliably held in the housing cylinder.

  In the medical needle, the lock member includes a base fixed to an inner peripheral portion of the housing cylinder, and the engagement portion extends from one end side to the other end side of the base body and is elastically deformable. A first engagement piece and an elastically deformable second engagement piece extending from the other end side to the one end side of the base body, and at least the base body of the base body and the engagement portion is The projection is provided on the shaft between the first engagement piece and the second engagement piece when the shaft is moved to the second position. It may be configured as follows.

  According to said structure, since an engaging part is comprised by the 1st engaging piece and 2nd engaging piece which can be elastically deformed, and a base | substrate is comprised in a symmetrical shape in an axial direction, before and after a locking member Regardless of the directionality, the lock member can be attached to the housing cylinder, and therefore, the assembly workability is excellent.

  In the above medical needle, the base includes a plurality of ring portions extending along the axial direction at intervals in the circumferential direction between the two ring portions constituting both end portions in the axial direction and the two ring portions. The first engagement piece and the second engagement piece may be disposed between the plurality of intermediate portions.

  According to said structure, the locking member which has several engagement piece can be comprised compactly as a single component.

  In the above medical needle, the housing cylinder includes a first tube portion and a second tube portion provided at a proximal end of the first tube portion and having the shaft disposed therein so as to be displaceable in the axial direction. And when the shaft is in the first position with respect to the receiving cylinder, the tip of the shaft may be disposed in the second pipe portion.

  According to said structure, since the front-end | tip of a shaft when a shaft comes to the most front end side of a movable range exists in the 2nd pipe part of a base end side rather than the 1st pipe part of a storage cylinder, It is easy to make one pipe part thin. That is, since the shaft is not inserted into the first tube portion that forms the distal end side of the housing cylinder, the outer diameter of the first tube portion can be set to be small accordingly. For this reason, the body part of the medical needle can be easily reduced in diameter. Since the user can easily pick the body portion having a reduced diameter with fingers, a medical needle having excellent operability can be provided.

  In the above medical needle, the medical needle may be configured as a winged needle having a wing shaft portion surrounding the first tube portion and a pair of wings protruding in opposite directions from the wing shaft portion. Good.

  According to said structure, since a 1st pipe part can be made thin, it is also possible to comprise also the wing axial part surrounding a 1st pipe part thin. When the wing shaft portion is thin, the needle tip of the needle body tends to be stable during an operation of picking the wing shaft portion through the root portion of the folded wing and puncturing the needle body into the living body. Therefore, a medical needle excellent in operability can be provided.

  According to the medical needle of the present invention, it is possible to reliably prevent the needle body from re-projecting from the protector after the needle body is stored.

1 is an overall perspective view of a medical needle according to an embodiment of the present invention. It is a longitudinal cross-sectional view along the axial direction of the medical needle in a state in which the needle body protrudes from the tip of the housing cylinder by a predetermined length. It is a longitudinal cross-sectional view along the axial direction of the medical needle in the state where the needle tip of the needle body is housed in the housing cylinder. It is a disassembled perspective view of a medical needle. It is a perspective view which shows the locking member of a medical needle. It is a longitudinal cross-sectional view of the locking member and its peripheral part in the medical needle in the state shown in FIG. It is a longitudinal cross-sectional view of the locking member and its peripheral part in the medical needle in the state shown in FIG.

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

  FIG. 1 is an overall perspective view showing a configuration of a medical needle 10 according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view along the axial direction of the medical needle 10 in a state where the needle body 12 protrudes from the tip of the housing cylinder 16 by a predetermined length. FIG. 3 is a longitudinal sectional view along the axial direction of the medical needle 10 in a state where the needle tip 12a of the needle body 12 is housed in the housing tube 16. As shown in FIG. FIG. 4 is an exploded perspective view of the medical needle 10.

  In the present embodiment, the medical needle 10 is configured as a winged needle that is fixed and used while being punctured into the patient's skin during blood collection, blood transfusion, infusion, or the like. In addition, this invention is applicable not only to a winged needle but the other kind of medical needle 10, for example, the indwelling needle etc. which are used when performing continuous intravenous infusion.

  A medical needle 10 configured as a winged needle includes a needle body 12 that can puncture a living body, a hub 14 that supports the needle body 12, a housing cylinder 16 that slidably holds the hub 14, and a hub that houses the hub. 16 is provided with a lock member 18 that is locked at a predetermined position with respect to 16 and a wing member 20 that is fixed at a position near the tip of the housing cylinder 16.

  The needle body 12 is a portion that is punctured into the skin of a patient undergoing treatment such as blood sampling, blood transfusion, and fluid transfusion, and is made of, for example, a metal material such as stainless steel, aluminum or aluminum alloy, titanium or titanium alloy, and the like. A sharp needle tip 12a is formed at the tip. The needle body 12 is configured in a circular tube shape having a hollow portion serving as a flow path for body fluid such as blood or infusion. An opening 12 b that functions as a liquid inlet / outlet is formed at the tip of the needle body 12.

  As shown in FIG. 1, a cap 22 is attached to the medical needle 10 before the medical needle 10 is used. The cap 22 is formed in a hollow cylindrical shape that can accommodate the needle body 12 therein, and is fitted to the distal end side of the wing member 20 on the proximal end side so that the medical needle is covered with the needle body 12. 10 can be mounted. When using the medical needle 10, the cap body 22 can be pulled away from the wing member 20 to expose the needle body 12.

  The hub 14 is connected to the proximal end of the needle body 12 and supports the needle body 12. In this embodiment, the hub 14 is connected to the proximal end of the needle body 12 coaxially with the needle body 12, a hollow shaft 24 whose hollow portion communicates with the lumen of the needle body 12, and a proximal end of the shaft 24. A fixed operation unit 26.

  As shown in FIGS. 2 and 3, the shaft 24 is formed with a lumen 24 a communicating with the lumen of the needle body 12 along the axial direction, and a portion near the tip of the lumen 24 a has a diameter. A reduced diameter portion 24b bulging inward in the direction is provided. The proximal end of the needle body 12 is inserted into the distal end of the shaft 24, and the proximal end surface of the needle body 12 and the distal end surface of the reduced diameter portion 24b come into contact with each other so that the needle body 12 and the shaft 24 are positioned in the axial direction. At that position, the needle body 12 and the shaft 24 are fixed to each other. The shaft 24 is configured to have a larger diameter than the needle body 12.

  As shown in FIGS. 2 to 4, an annular protrusion 28 that bulges outward in the radial direction and extends around the circumference in the circumferential direction is provided at the tip of the shaft 24. The protrusion 28 is an engaging portion of the lock member 18 that is fixedly arranged inside the housing cylinder 16 when the shaft 24 comes to a retracted position (second position described later) with respect to the housing cylinder 16. 62 (see FIGS. 4 and 5). Instead of the annular protrusion 28, another shape of protrusion that protrudes in a direction orthogonal to the axis of the shaft 24 may be provided in a partial range of the shaft 24 in the circumferential direction. Further, the protruding portion 28 or the protruding portion having another shape may be provided at a position slightly shifted to the proximal end side with respect to the distal end of the shaft 24 instead of the distal end of the shaft 24.

  The operation unit 26 is a part that a user picks up with fingers and performs a backward operation. The operation unit 26 includes a base portion 44 and a hollow cylindrical portion 46 extending from the base portion 44 in the distal direction. In the present embodiment, the base portion 44 has a shape that becomes wider toward the base end direction, and an uneven shape 45 that functions as an anti-slip when the operator grips and moves backwards is provided on both the left and right sides. It is done.

  As shown in FIG. 3, the cylindrical portion 46 is configured to surround the proximal end portion of the shaft 24, and an annular recess 43 that opens in the distal direction is formed between the cylindrical portion 46 and the shaft 24. . As shown in FIGS. 3 and 4, a plurality of projections 47 projecting inward are provided at intervals in the circumferential direction on the inner circumferential portion of the cylindrical portion 46. In the illustrated example, inner flat surfaces 46a that are parallel to each other are provided on the left and right sides of the inner peripheral portion of the cylindrical portion 46, and a protrusion 47 is provided on each of the inner flat surfaces 46a. One protrusion 47 may be provided.

  At the proximal end of the operation portion 26, a concave tube connection portion 38 that can be connected to a tube (not shown) connected to an infusion bag, a blood bag, or the like is provided. In addition, it may replace with a concave tube connection part and the tube connection part of another form which protruded from the base end of the operation part 26 to the base end direction may be provided. Alternatively, the shaft 24 and the operation unit 26 are configured such that the proximal end of the shaft 24 protrudes from the proximal end of the operation unit 26, and connected to a tube (not shown) connected to an infusion bag or the like at the proximal end of the shaft 24. A further possible form of tube connection may be provided.

  The constituent materials of the shaft 24 and the operation unit 26 are not particularly limited. For example, polyvinyl chloride, polyethylene, polypropylene, cyclic polyolefin, polystyrene, poly- (4-methylpentene-1), polycarbonate, acrylic resin, acrylonitrile- Examples include butadiene-styrene copolymers, polyesters such as polyethylene terephthalate and polyethylene naphthalate, butadiene-styrene copolymers, polyamides (for example, nylon 6, nylon 6,6, nylon 6,10, nylon 12) and the like.

  As shown in FIGS. 1 and 2, the storage cylinder 16 is provided with a first pipe portion 48 that forms the distal end side of the storage cylinder 16 and a base end of the first pipe section 48, and is thicker than the first pipe portion 48. It has a second pipe portion 50 that is configured (having a large diameter) and on which the shaft 24 is disposed so as to be axially displaceable. The housing cylinder 16 is configured to cover the needle tip 12 a of the needle body 12 when the shaft 24 is retracted to a predetermined position with respect to the housing cylinder 16. That is, the storage cylinder 16 functions as a protector that covers the needle tip 12 a of the needle body 12 after the use of the medical needle 10.

  The accommodating cylinder 16 is fixed to the wing member 20 by fitting a predetermined range (a portion of the first pipe portion 48 in the present embodiment) closer to the tip inside the wing shaft portion 88 of the wing member 20. . As shown in FIGS. 2 and 3, an inner cavity 53 that penetrates in the axial direction and allows the needle body 12 to be inserted is formed inside the housing cylinder 16. The lumen 53 provided in the housing cylinder 16 includes a first lumen 53 a formed in the first tube portion 48 and a second lumen 53 b formed in the second tube portion 50. The inner diameter of the second lumen 53b is larger than the inner diameter of the first lumen 53a.

  The first pipe portion 48 is a relatively thin portion disposed inside the wing shaft portion 88. In the second pipe portion 50, the shaft 24 is disposed so as to be displaceable in the axial direction. The shaft 24 has a first position where the distal end of the needle body 12 protrudes from the housing cylinder 16 by a predetermined length with respect to the housing cylinder 16 and the distal end of the shaft 24 is disposed in the second pipe portion 50 (see FIG. 2). The tip of the needle body 12 can be slid to the second position (see FIG. 3) where the tip of the needle body 12 is housed in the housing cylinder 16.

  As shown in FIGS. 3 and 4, in the present embodiment, the proximal end portion of the second pipe portion 50 has a proximal end expansion that is slightly larger in diameter than the distal end portion over a predetermined range in the axial direction. A diameter portion 51 is provided. On the left and right sides of the outer peripheral portion of the base end enlarged diameter portion 51, outer flat surfaces 51 a that are parallel to each other are provided, and protrusions 47 provided on the inner peripheral portion of the cylindrical portion 46 of the operation portion 26 on the outer flat surfaces 51 a. A plurality of engagement holes 49 that can be engaged with each other are provided. The engagement hole 49 in the illustrated example penetrates the wall portion of the base end enlarged diameter portion 51. When only one protrusion 47 is provided in the operation unit 26, only one engagement hole 49 needs to be provided.

  In the initial state shown in FIG. 2 (the shaft 24 is at the most distal position of the movable range with respect to the housing cylinder 16 and the needle body 12 protrudes from the tip of the housing cylinder 16 by a predetermined length), the protrusion 47 and the engagement hole 49 are Engage. When the force to move the shaft 24 in the proximal direction relative to the housing cylinder 16 is less than a predetermined value, the engagement state between the protrusion 47 and the engagement hole 49 is maintained, and therefore the housing cylinder of the shaft 24 is maintained. Axial movement relative to 16 is prevented. On the other hand, when the force to move the shaft 24 in the proximal direction relative to the housing cylinder 16 becomes a predetermined value or more, the engagement between the protrusion 47 and the engagement hole 49 is released, and the housing cylinder 16 of the shaft 24 is released. Axial movement with respect to is allowed.

  Thus, in the present embodiment, the shaft 24 can be released to the first position with respect to the housing cylinder 16 by the protrusion 47 provided in the operation portion 26 and the engagement hole 49 provided in the housing cylinder 16. First locking means 39 (see FIG. 6) to be engaged with is configured. The target structure that can be engaged with the protrusion 47 provided in the housing cylinder 16 is not limited to the engagement hole 49, but may be a recess (groove) provided in the outer peripheral portion of the housing cylinder 16.

  The first locking means 39 is not limited to the illustrated configuration, and the male-female arrangement of the engagement structure may be a configuration opposite to the configuration shown in FIG. That is, in the operation portion 26, a groove or a hole is provided instead of the protrusion 47, and in the receiving cylinder 16, a protrusion protruding outward is provided instead of the engagement hole 49 or the recess, and the operation portion 26 side is provided. You may employ | adopt the structure which the said groove part or a hole, and the said protrusion by the side of the storage cylinder 16 engage.

  Although it does not specifically limit as a constituent material of the storage cylinder 16, For example, 1 or more types of materials selected from what was illustrated as a constituent material of the shaft 24 and the operation part 26 mentioned above can be employ | adopted.

  As shown in FIG. 6, the lock member 18 is disposed at a location near the proximal end in the inner peripheral portion of the housing cylinder 16 (second pipe portion 50). Therefore, an arrangement portion 52 for arranging the lock member 18 is provided at a location near the proximal end in the inner peripheral portion of the housing cylinder 16 (second pipe portion 50). In this embodiment, the arrangement | positioning part 52 is formed in a larger diameter than the site | part of the front end side. A plurality of groove portions 55 with which a part of the lock member 18 is engaged are provided at locations near the tip of the arrangement portion 52. In the illustrated example, two groove portions 55 are provided at substantially the opposite positions (positions whose phases are shifted by 180 degrees) in the inner peripheral portion of the housing cylinder 16, but one or three or more groove portions 55 may be provided. In the illustrated example, the inner end of the engagement hole 49 is opened on the inner peripheral surface near the base end of the arrangement portion 52 at a substantially diametrically opposite position (position where the phase is shifted by 180 degrees) in the circumferential direction. A part of the lock member 18 is engaged with the hole 49.

  As shown in FIG. 5, the lock member 18 includes a base body 60 that is fixed to the inner peripheral portion (the arrangement portion 52 described above) of the housing cylinder 16, and an engagement portion 62 that can be engaged with the shaft 24. As a whole, it has a substantially hollow cylindrical shape. In this embodiment, the base body 60 includes a plurality of ring portions 65 that constitute both end portions in the axial direction, and a plurality of portions that extend along the axial direction at intervals in the circumferential direction between the two ring portions 65. And an intermediate portion 67.

  A plurality of engaging projections 68 projecting outward are provided on the outer peripheral portion of the ring portion 65 on the one end side and the other end side, respectively, at intervals in the circumferential direction. In the illustrated example, the engagement protrusion 68 on one end side is provided at a position approximately opposite to the circumferential direction of the ring portion 65 on one end side, and engages with a groove portion 55 provided in the arrangement portion 52 as shown in FIG. Instead of the groove portion 55, a plurality of hole portions penetrating the wall portion of the housing cylinder 16 may be provided, and the engagement protrusion 68 on one end side of the lock member 18 may be engaged with the hole portion.

  In the illustrated example, the engagement protrusion 68 on the other end side of the lock member 18 is provided at a position approximately opposite to the circumferential direction of the ring portion 65 on the other end side, and as shown in FIG. It engages with an engagement hole 49 that opens to the inner surface of the arrangement portion 52 at a location. The target structure with which the engagement protrusion 68 on the other end side of the lock member 18 is engaged is not limited to the engagement hole 49, but is a recess provided in the inner peripheral portion (the inner peripheral portion of the arrangement portion 52) of the housing cylinder 16. Groove).

  The engagement protrusions 68 on the one end side and the other end side of the lock member 18 are engaged with the groove portions 55 and the engagement holes 49 provided in the arrangement portion 52 of the receiving cylinder 16, respectively. 18 is positioned in the arrangement portion 52 and fixed to the housing cylinder 16. The engagement protrusion 68 may be provided only in one of the ring portion 65 on the one end side and the ring portion 65 on the other end side, or may be provided on the intermediate portion 67 instead of the ring portion 65. . In this case, a groove or hole that engages with the engagement protrusion 68 is provided at a corresponding position on the inner peripheral portion of the arrangement portion 52.

  In each ring portion 65, one engagement protrusion 68 may be provided in the circumferential direction. As shown in FIG. 5, in the present embodiment, the two ring portions 65 have the same shape, and the same number of engagement protrusions 68 on one end side and the other end side are provided in the same phase in the circumferential direction. That is, the base end is configured to be symmetrical in the axial direction.

  In the present embodiment, the engaging portion 62 extends from one end side of the base body 60 toward the other end side and is elastically deformable in the radial direction of the lock member 18, and the other end of the base body 60. A second engagement piece 64 extending from the side toward one end and elastically deformable in the radial direction of the lock member 18 is provided. A plurality of (four in the illustrated example) first engagement pieces 63 are provided at intervals in the circumferential direction. A plurality (four in the illustrated example) of second engagement pieces 64 are provided at intervals in the circumferential direction. The first engagement piece 63 and the second engagement piece 64 are disposed between the plurality of intermediate portions 67. The first engagement piece 63 and the second engagement piece 64 are inclined so as to approach the inside (radially inward) of the cylindrical lock member 18 from the support end side toward the free end side. The ring portion 65, the intermediate portion 67, the engagement protrusion 68, the first engagement piece 63, and the second engagement piece 64 are integrally molded to constitute a single lock member 18.

  In the present embodiment, the base body 60 is configured symmetrically in the axial direction, and the same number of first engaging pieces 63 and second engaging pieces 64 are provided in the same phase in the circumferential direction. Accordingly, since the lock member 18 in the present embodiment is generally formed in a symmetrical shape in the axial direction, the lock member 18 is reverse to the front and rear in the direction shown in FIG. It can also be arranged in the direction. For this reason, when the medical needle 10 is assembled, the lock member 18 can be attached to the housing cylinder 16 regardless of the front-rear direction of the lock member 18, and the assembly workability is excellent.

  Note that the lock member 18 in the present embodiment has a plurality of first engagement pieces 63 and a plurality of second engagement pieces 64, respectively, but one each of the first engagement pieces 63 and the second engagement pieces 64. The structure which has may be sufficient.

  When the shaft 24 moves from the first position toward the second position with respect to the housing cylinder 16, the protrusion 28 provided on the shaft 24 presses the first engagement piece 63 outward. The first engaging piece 63 is elastically deformed outward (outward in the radial direction), so that the protrusion 28 gets over the first engaging piece 63. When the lock member 18 is disposed in the direction opposite to the front and rear direction with respect to the housing cylinder 16 as shown in FIG. 2 and the like, the shaft 24 is moved from the first position to the second position with respect to the housing cylinder 16. When moving toward the position, the projection 28 provided on the shaft 24 presses the second engagement piece 64 outward, so that the second engagement piece 64 is outward (radially outward). Due to the elastic deformation, the protrusion 28 gets over the second engagement piece 64.

  In the second position where the shaft 24 is displaced to the most proximal side with respect to the housing cylinder 16, as shown in FIG. By entering between the engaging pieces 64, the axial movement of the shaft 24 with respect to the housing cylinder 16 is prevented. In the present embodiment, the lock member 18 and the protrusions 28 provided on the shaft 24 cause the shaft 24 to be locked to the housing cylinder 16 in the second position substantially unreleasably. Is configured.

  As a constituent material of the lock member 18, for example, one or more resin materials or metal materials selected from those exemplified as the constituent materials of the shaft 24 and the operation unit 26 described above can be used. The member 18 is made of a metal material so that the mechanical strength is higher than that of the housing cylinder 16. When the lock member 18 is made of metal, even when an excessive load is applied to the first engagement piece 63 or the second engagement piece 64 of the lock member 18 from the shaft 24, the first engagement piece 63 or the second engagement is performed. Breakage of the piece 64 can be prevented. Examples of the metal material constituting the lock member 18 include stainless steel, aluminum, aluminum alloy, titanium, titanium alloy, copper, copper-based alloy, tantalum, and cobalt alloy.

  As shown in FIGS. 1 to 4, the wing member 20 includes a hollow wing shaft portion 88 and a pair of wings 90 a and 90 b that protrude left and right from the wing shaft portion 88. The wings 90a and 90b are formed in a plate shape that is coupled to the wing shaft portion 88 at the root portion and becomes wider from the root portion toward the outer end. The wings 90a and 90b have flexibility, and are configured to be openable and closable by bending or bending near the root. Thin portions 92a and 92b are formed in the vicinity of the base portions of the wings 90a and 90b so as to facilitate opening and closing.

  The upper surface of one wing 90a is provided with a plurality (two in the illustrated example) of convex portions 94, and the upper surface of the other wing 90b is provided with a plurality of (two in the illustrated example) concave portions as the convex portions 94. 96 is provided, and when the pair of wings 90a and 90b are closed (folded), the convex portion 94 and the concave portion 96 are fitted. One convex portion 94 and one concave portion 96 may be provided.

  The wing shaft portion 88 and the wings 90a and 90b in the illustrated example are integrally formed. However, the wing shaft portion 88 and the wings 90a and 90b are formed separately and combined to form the wing member 20. Good. Although it does not specifically limit as a constituent material of the wing axial part 88 and wings 90a and 90b, For example, 1 or more types of materials selected from what was illustrated as constituent materials, such as the shaft 24 mentioned above, can be employ | adopted.

  The wing shaft portion 88 is made of a material having high rigidity so as not to bend during use, and the wings 90a and 90b are flexible so that the root portion can be bent and can be easily opened and closed. You may comprise with material. The wing member 20 in which the wing shaft portion 88 and the wings 90a and 90b are integrally formed can be manufactured, for example, by two-color molding using a resin material having a relatively high rigidity and a resin material having a relatively low rigidity.

  The medical needle 10 according to the present embodiment is basically configured as described above, and its operation and effects will be described below.

  In order to perform blood collection, blood transfusion, infusion, and the like using the medical needle 10 configured as described above, first, the cap 22 is removed from the medical needle 10 to expose the needle body 12. Next, the pair of wings 90a and 90b are picked with fingers and closed (folded). Specifically, the bases of both wings 90a, 90b are bent and closed so that one wing 90a and the other wing 90b overlap. At this time, the convex part 94 provided in one wing 90a and the concave part 96 provided in the other wing 90b are fitted to each other, thereby preventing mutual displacement.

  When the wings 90a and 90b are in the closed state, the needle body 12 is punctured into the living body while holding the closed wings 90a and 90b with fingers. At this time, as shown in FIG. 6, since the engagement hole 49 provided in the storage cylinder 16 and the projection 47 provided in the operation portion 26 are engaged, the axial direction of the shaft 24 with respect to the storage cylinder 16 The movement is blocked. That is, the engagement force between the engagement hole 49 and the protrusion 47 is larger than the force that the shaft 24 tends to move in the proximal direction with respect to the storage cylinder 16 when the needle body 12 is punctured into the living body. The needle body 12 is prevented from moving backward with respect to the wing member 20 fixed thereto. For this reason, the needle body 12 does not move backward with respect to the housing cylinder 16 due to the puncture resistance when the wing member 20 is picked with a finger and the needle body 12 is punctured into the living body.

  When the needle body 12 is left in the state of being punctured with respect to the living body, the wings 90a and 90b are returned to the opened state, and the wings 90a and 90b are fixed to the skin with an adhesive tape or the like.

  When blood collection, blood transfusion, infusion, etc. are completed, the fixation of the wings 90a, 90b to the skin with an adhesive tape or the like is released, and the needle body 12 is removed from the living body. In this way, when the use of the medical needle 10 is finished, the storage functioning as a protector in order to prevent a medical worker such as a person who discards the medical needle 10 from inadvertently touching the needle body 12. A “storage operation” is performed in which the needle body 12 is covered and stored by the cylinder 16.

  In this storage operation, first, the engagement between the protrusion 47 and the engagement hole 49 is released, and the shaft 24 is brought into a state in which it can move in the proximal direction with respect to the storage cylinder 16. Specifically, when the operating portion 26 is picked and pulled in the proximal direction with respect to the housing cylinder 16, when the pulling force exceeds the engaging force between the protrusion 47 and the engaging hole 49, the protrusion 47 and the engaging hole 49. Is disengaged, and the shaft 24 is movable in the proximal direction with respect to the housing cylinder 16.

  Therefore, the operating portion 26 is further pulled to move the shaft 24 in the proximal direction with respect to the housing cylinder 16. In a state where the hub 14 is moved to the most proximal side with respect to the housing cylinder 16, the needle body 12 is positioned inside the housing cylinder 16 (specifically, inside the first tube portion 48). As shown in FIG. 3, when the shaft 24 moves to a predetermined retracted position (second position), the action of the second locking means 41 (see FIG. 7) including the locking member 18 causes the shaft 24 to move relative to the housing cylinder 16. Forward movement is prevented. Therefore, the needle body 12 does not protrude from the tip of the housing cylinder 16 again. Further, since the second locking means 41 prevents the backward movement of the shaft 24 with respect to the housing cylinder 16, the needle body 12 is effectively prevented from being pulled out from the proximal end of the housing cylinder 16.

  As described above, according to the medical needle 10 according to the present invention, the lock member 18 that locks the shaft 24 in the second position with respect to the housing cylinder 16 is configured as a separate member from the housing cylinder 16. Thus, as the material of the lock member 18, a material having a higher strength than the housing cylinder 16 (a material that is not easily damaged) can be employed. Therefore, by giving the lock member 18 the necessary strength, it is possible to prevent or suppress the lock member 18 from being broken (broken) after the needle body 12 is housed in the housing cylinder 16. The possibility of projecting again from the housing cylinder 16 can be greatly reduced.

  In the case of the present embodiment, since the lock member 18 is made of metal, an excessive load is applied to the engagement portion 62 of the lock member 18 from the shaft 24, and the engagement portion 62 of the lock member 18 exceeds the elastic limit. Even when it is deformed, the engaging portion 62 is not broken. Accordingly, the needle body 12 can be reliably held in the housing cylinder 16.

  In the case of the present embodiment, the lock member 18 includes a base body 60 fixed to the inner peripheral portion of the housing cylinder 16, an elastically deformable first engagement piece 63 and a second engagement piece 64 that constitute the engagement portion 62. And is symmetrically formed in the axial direction (front-rear direction) as a whole, and when the shaft 24 moves to the second position, the shaft is interposed between the first engagement piece 63 and the second engagement piece 64. 24 is configured so that a protrusion 28 provided in 24 enters. Thus, since the engaging part 62 is comprised by the 1st engaging piece 63 and the 2nd engaging piece 64 which can be elastically deformed, and the locking member 18 is comprised symmetrically in the axial direction, the locking member The lock member 18 can be mounted on the housing cylinder 16 regardless of the direction of the front and rear of 18, and the assembly workability is excellent. The lock member 18 includes at least a first engagement piece 63 that is elastically deformable and extends from one end side to the other end side of the base body 60 so that the base body 60 fixed to the housing cylinder 16 is symmetrical in the axial direction. And the second engagement pieces 64 extending from the other end side of the base body 60 to the one end side, the number of the first engagement pieces 63 and the second engagement pieces 64 and the phase in the circumferential direction are Even if the configuration is shifted, the lock member 18 can be attached to the housing cylinder 16 regardless of the front-rear direction of the lock member 18.

  In the case of the present embodiment, in the lock member 18, the base body 60 extends along the axial direction with a spacing in the circumferential direction between the two ring portions 65 constituting both end portions in the axial direction and the two ring portions 65. The first engagement piece 63 and the second engagement piece 64 are arranged between the plurality of intermediate portions 67 and thus have a plurality of elastic engagement pieces. The lock member 18 can be compactly configured as a single component.

  The lock member 18 is not limited to the structure shown in the present embodiment, and may be a structure that can be engaged with the shaft 24. For example, when it is possible to allow the lock member 18 to have front-rear directionality, a lock member according to the following modification may be employed, although not shown. The lock member according to the modification has an elastic engagement piece on one end side, a fixed engagement wall that does not substantially elastically deform on the other end side, and the elastic engagement piece is relatively fixed on the distal end side. It arrange | positions at the accommodating cylinder 16 so that an engagement wall may be arrange | positioned relatively to the base end side. In the case of this configuration, when the shaft 24 moves to the second position with respect to the housing cylinder 16, the protruding portion 28 provided on the shaft 24 enters between the elastic engagement piece and the fixed engagement wall. The movement of the shaft 24 in the axial direction relative to the housing cylinder 16 is prevented.

  In the case of this embodiment, the housing cylinder 16 has a first tube portion 48 and a second tube portion 50, and when the shaft 24 is in the first position with respect to the housing tube 16, the tip of the shaft 24 is first. It is comprised so that it may be arrange | positioned in the 2 pipe part 50. FIG. According to this configuration, the distal end of the shaft 24 when the shaft 24 moves to the most distal end side of the movable range is in the second tube portion 50 on the proximal end side with respect to the first tube portion 48 of the housing cylinder 16. The first tube portion 48 of the housing cylinder 16 can be easily made thin. That is, since the shaft 24 is not inserted into the first tube portion 48 that constitutes the distal end side of the housing cylinder 16, the outer diameter of the first tube portion 48 can be set to be reduced accordingly. For this reason, the body part of the medical needle 10 can be easily reduced in diameter. Since the user can easily pick the body portion having a reduced diameter with fingers, the medical needle 10 having excellent operability can be provided.

  In the case of the present embodiment, the medical needle 10 is configured as a winged needle having a wing shaft portion 88 and a pair of wings 90a and 90b. As described above, since the first tube portion 48 can be made thin, the wing shaft portion 88 surrounding the first tube portion 48 can also be made thin. When the wing shaft portion 88 is thin, the needle tip 12a of the needle body 12 is likely to be stabilized during the operation of picking the wing shaft portion 88 over the root portions of the folded wings 90a and 90b and puncturing the needle body 12 into the living body. Therefore, a winged needle excellent in operability can be provided.

  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.

DESCRIPTION OF SYMBOLS 12 ... Needle body 16 ... Housing cylinder 18 ... Lock member 20 ... Wing member 24 ... Shaft 26 ... Operation part 28 ... Projection part 48 ... 1st pipe part 50 ... 2nd pipe part 60 ... Base | substrate 62 ... Engagement part 63 ... 1st 1 engaging piece 64 ... 2nd engaging piece 65 ... ring part 67 ... intermediate part 88 ... wing shaft part 90a, 90b ... wing

Claims (6)

A needle body having a needle tip at the tip;
A shaft provided at the proximal end of the needle body,
A housing cylinder that surrounds the shaft and is disposed inside the shaft so as to be displaceable in an axial direction;
A locking member fixed to the housing cylinder and having an engaging portion engageable with the shaft,
The shaft extends from a first position where the tip of the needle body protrudes from the housing cylinder by a predetermined length relative to the housing cylinder to a second position where the tip of the needle body is housed in the housing cylinder. Is slidable,
When the shaft moves to the second position, the engagement portion of the lock member engages with the shaft, so that the shaft is locked at the second position with respect to the housing cylinder. The
A medical needle characterized by that. The medical needle according to claim 1, wherein
The lock member is made of metal.
A medical needle characterized by that. The medical needle according to claim 1 or 2,
The lock member includes a base body fixed to an inner peripheral portion of the housing cylinder,
The engaging portion includes a first engaging piece that extends from one end side to the other end side of the base body and is elastically deformable, and a first engaging piece that extends from the other end side of the base body to the one end side and is elastically deformable. Two engaging pieces,
Of the base body and the engaging portion, at least the base body is configured to be symmetrical in the axial direction,
When the shaft moves to the second position, a protrusion provided on the shaft enters between the first engagement piece and the second engagement piece.
A medical needle characterized by that. The medical needle according to claim 3,
The base body includes two ring portions constituting both end portions in the axial direction, and a plurality of intermediate portions extending along the axial direction at intervals in the circumferential direction between the two ring portions. ,
The first engagement piece and the second engagement piece are disposed between the plurality of intermediate portions.
A medical needle characterized by that. In the medical needle according to any one of claims 1 to 4,
The housing cylinder includes a first tube portion, and a second tube portion provided at a proximal end of the first tube portion and having an inner shaft displaceably disposed in the axial direction.
When the shaft is in the first position with respect to the receiving cylinder, the tip of the shaft is disposed in the second pipe portion,
A medical needle characterized by that. In the medical needle according to any one of claims 1 to 5,
The medical needle is configured as a winged needle having a wing shaft portion surrounding the first tube portion and a pair of wings protruding in opposite directions from the wing shaft portion.
A medical needle characterized by that.

Images