Pharmaceutical liquid administration device

Abstract

A pharmaceutical liquid administration device (10) comprises: a puncture part (14); a needle cover (18) provided so as to be movable with respect to a housing (12); a sliding member (20) provided so as to be slidable with respect to the housing (12) and connected to the needle cover (18) with a connection part (19) therebetween; and an attachment member (22) fixed to the sliding member (20). When the needle cover (18) is in a puncture allowing position, the needle cover (18) is restricted from moving to a blocking position by a first lock part (210) of the sliding member (20). Detaching the housing (12) from skin (S) of a living body enables the sliding member (20) to move to a post-sliding position and enables the needle cover (18) to move to the blocking position.

Description

Drug administration device

[0001] The present invention relates to a drug solution administration device.

[0002] Conventionally, a drug solution administration device equipped with a needle cover for covering the puncture needle after drug solution administration has been known (see, for example, JP-A-2020-522315).

[0003] It is desirable to have a drug solution administration device in which the needle cover does not cover the tip of the puncture needle in the initial state, and the needle cover can be moved after the drug solution is administered, allowing the needle cover to cover the tip of the puncture needle.

[0004] The present invention aims to solve the above-mentioned problems.

[0005] (1) One aspect of the present invention is a drug solution administration device comprising: a puncturing unit having a puncturing needle capable of puncturing the skin of a living body and for administering a drug solution; a housing that accommodates the puncturing unit and has a bottom wall from which the puncturing needle can protrude; a needle cover that is movably provided with respect to the housing; a sliding member that faces the bottom wall of the housing and is slidably provided with respect to the housing; and an attachment member that is fixed to the sliding member and includes an attachment surface that can be attached to the skin of the living body, wherein the needle cover is movable from a puncturing allowance position that allows the puncturing needle to puncture the skin to a shielding position that covers the needle tip of the puncturing needle, and the needle cover and the sliding member are connected via a connecting portion so as to interlock with each other, the sliding member has a first locking portion that engages with a first engaging portion provided on the housing, and when the needle cover is in the puncture-allowing position, the sliding member is in a pre-sliding position fixed to the housing by the first locking portion, restricting movement of the needle cover to the shielding position, and when the housing is moved away from the skin of the living body, the engagement between the first engaging portion and the first locking portion is released, allowing the sliding member to move to the post-sliding position and the needle cover to move to the shielding position, in this drug solution administration device.

[0006] In this medicinal solution administration device, in the initial state, the first locking part restricts the movement of the needle cover to the shielding position, so that the puncture needle can be inserted into the skin of a living body without covering the tip of the puncture needle with the needle cover. On the other hand, after administering the medicinal solution, the restriction on the movement of the needle cover by the first locking part is released by moving the housing away from the skin of the living body, so that the tip of the puncture needle can be covered with the needle cover.

[0007] (2) In the drug solution administration device described in item (1) above, a portion of the adhesive member may be fixed to the first locking portion, and when the housing is moved away from the skin of the living body, the first locking portion may be pulled by the skin, moving away from the bottom wall portion of the housing and disengaging from the first engaging portion.

[0008] This makes it possible to link the movement of the housing away from the skin of the living body with the disengagement of the first locking portion and the first engaging portion, using a simple structure.

[0009] (3) In the drug solution administration device described in item (2) above, the sliding member has a sliding plate connected to the needle cover via the connecting portion, the first locking portion is a movable piece that is movable relative to the sliding plate, and a portion of the peripheral portion of the first locking portion may be connected to the sliding plate.

[0010] With this configuration, the first locking portion is movably arranged relative to the sliding plate, and therefore, with a simple configuration, the first locking portion can be separated from the first engagement portion when the housing is separated from the skin of the living body.

[0011] (4) In the drug solution administration device described in any one of items (1) to (3) above, the sliding member may have a second locking portion that can engage with a second engaging portion provided on the housing, and when the sliding member is in the post-sliding position, the second locking portion may engage with the second engaging portion to restrict the sliding member from moving toward the pre-sliding position.

[0012] With this configuration, the sliding member is fixed in the post-sliding position by the second locking portion, so that the needle cover can be prevented from returning to the puncture-permitted position.

[0013] (5) In the drug solution administration device described in item (4) above, the sliding member may have a sliding plate connected to the needle cover via the connecting portion, and the second locking portion may be an elastic piece having one end connected to the sliding plate.

[0014] This allows the second locking portion to be engaged with the second engaging portion of the housing when the sliding member reaches the post-sliding position, with a simple structure.

[0015] (6) In the drug solution administration device described in item (5) above, the second locking portion has an engaging claw portion provided with an inclined surface inclined with respect to the movement direction of the sliding member, the housing has a storage portion formed by a groove or hole that stores the engaging claw portion when the sliding member is in the pre-slide position, the second engaging portion is a groove or hole that engages with the engaging claw portion when the sliding member is in the post-slide position, and when the sliding member moves from the pre-slide position to the post-slide position, the inclined surface slides against the storage portion, and the second locking portion deforms in a direction away from the storage portion, thereby causing the engaging claw portion to disengage from the storage portion.

[0016] With this configuration, an inclined surface is provided on the engaging claw of the second locking portion, so that the engaging claw can be smoothly released from the accommodating portion.

[0017] (7) In the drug solution administration device described in the above item (6), the adhesive member may not be fixed to the second locking portion.

[0018] With this configuration, when the adhesive member is peeled off from the skin, the second locking part can be prevented from being pulled by the skin and being deformed.

[0019] (8) In the drug solution administration device described in any one of items (1) to (7) above, the needle cover has the form of a lid-like member that partially covers the housing, is in a closed state in the puncture-permitting position, and is in an open state in the shielding position, and the needle cover may have an opening that allows the puncture part to be received in the closed state, and a cover wall that covers the needle tip of the puncture needle in the open state.

[0020] This configuration makes it possible to realize a needle cover with a simple structure that does not hinder the operation of the puncture part when the lid is closed, and that adequately covers the tip of the puncture needle when the lid is open.

[0021] (9) In the drug solution administration device described in item (8) above, the puncture section has an abutment member with an abutment surface that contacts the skin, the abutment member is movably arranged relative to the housing, the abutment surface can protrude from the bottom wall portion, the opening allows the abutment member to be received when the needle cover is in the puncture-permitting position, the puncture needle can move relative to the abutment member and can protrude from the abutment surface toward the skin, and when the relative position between the housing and the part of the skin facing the abutment surface changes while the housing is placed on the skin, the abutment member may move relative to the housing so as to maintain contact between the abutment surface and the skin.

[0022] With this configuration, when the puncture needle punctures the skin of a living body, even if the relative position between the housing and the skin changes due to the body movement of the living body, the abutment member moves relative to the housing to follow the skin, thereby effectively preventing the puncture needle from coming out of the skin.

[0023] (10) In the drug solution administration device described in item (8) above, the needle cover may have a notch that communicates with the opening, and when the needle cover moves from the puncture-permitting position to the shielding position, a part of the puncture portion may pass through the notch.

[0024] With this configuration, the area of ​​the wall of the needle cover is sufficient to adequately cover the tip of the puncture needle, and the provision of the cutout allows the needle cover to be moved to the shielding position without any problems.

[0025] (11) The drug solution administration device according to any one of the above items (1) to (10) may further include a shielding biasing member that biases the needle cover toward the shielding position.

[0026] With this configuration, when the engagement between the first locking portion and the first engaging portion is released, the needle cover can be automatically moved to the shielding position by the biasing force of the shielding biasing member.

[0027] (12) In the drug solution administration device according to any one of the above items (1) to (11), the needle cover, the connecting portion, and the sliding member may be configured as a single component.

[0028] This configuration makes it possible to suppress an increase in the number of parts.

[0029] (13) In the drug solution administration device described in any one of items (1) to (11) above, the adhesive member may be fixed to the needle cover and the sliding member, and the connecting portion may be a part of the adhesive member.

[0030] According to the drug solution administration device of the present invention, it is possible to puncture the skin of a living body without covering the tip of the puncture needle with a needle cover. On the other hand, after administering the drug solution, the housing is moved away from the skin of the living body, which releases the restriction on the movement of the needle cover by the first locking part, allowing the tip of the puncture needle to be covered with the needle cover.

[0031] FIG. 1 is a perspective view of a drug solution administration device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the drug solution administration device. FIG. 3 is a cross-sectional view of the drug solution administration device in an initial state. FIG. 4 is an exploded perspective view of a puncture unit. FIG. 5 is a perspective view of the drug solution administration device as seen from the adhesive member side. FIG. 6A is a cross-sectional view showing the relationship between a first locking unit and a first engaging unit when a sliding member is in a pre-movement position. FIG. 6B is a cross-sectional view showing the relationship between the first locking unit and a first engaging unit when a sliding member is in a post-movement position. FIG. 7A is a cross-sectional view showing the relationship between a second locking unit and a second engaging unit when a sliding member is in a pre-movement position. FIG. 7B is a cross-sectional view showing the relationship between the second locking unit and a second engaging unit when a sliding member is in a post-movement position. FIG. 8 is a cross-sectional view of the drug solution administration device with the attachment detached. FIG. 9 is a view showing the drug solution administration device attached to skin. FIG. 10 is a cross-sectional view of the drug solution administration device in FIG. 9. FIG. 11 is a cross-sectional view of the drug solution administration device with the puncture needle puncturing the skin. Fig. 12 is a diagram showing a state when the drug solution administration device is peeled off from the skin. Fig. 13 is a diagram showing a state when the needle cover covers the puncture needle. Fig. 14 is a diagram showing a state when the relative position of the housing and the skin has changed due to body movement of the living body. Fig. 15 is a perspective view showing a connecting portion according to a modified example.

[0032] The medicinal solution administration device 10 shown in Figure 1 is attached to the skin S (see Figure 9) of a living patient and is used to administer a medicinal solution subcutaneously to the patient. The medicinal solution administration device 10 continuously administers a medicinal solution into the living body over a relatively long period of time (e.g., several minutes to several hours). The medicinal solution administration device 10 may also administer a medicinal solution into the living body intermittently. Examples of medicinal solutions include protein preparations such as insulin preparations, narcotic analgesics, and diuretics.

[0033] As shown in FIG. 2, the drug solution administration device 10 includes a housing 12, a puncture unit 14, a syringe pump unit 16, a needle cover 18, a sliding member 20, an adhesive member 22, a release sheet 24, and an attachment 26.

[0034] The housing 12 extends in one direction (X direction). The housing 12 has a bottom wall 28 that forms a wall on one side in the thickness direction (Z direction) of the housing 12, a ceiling 30 that forms a wall on the other side in the thickness direction of the housing 12, and a peripheral wall 32 that connects the bottom wall 28 and the ceiling 30. Hereinafter, with regard to the medicinal solution administration device 10 and its components, the Y direction that is perpendicular to the X direction and the Z direction will be referred to as the "width direction."

[0035] 5, a first opening 51 and a second opening 52 that penetrate in the Z direction are formed in the bottom wall 28 of the housing 12. The first opening 51 and the second opening 52 are located at one end (the end in the X1 direction) of the bottom wall 28. The first opening 51 and the second opening 52 are aligned in the width direction of the housing 12.

[0036] The first opening 51 is a circular hole. The first opening 51 is a hole for allowing a portion of the puncture portion 14 to protrude outward from the housing 12 toward the skin S of the living body. The housing 12 is provided with an annular protrusion 34 that surrounds the first opening 51 and protrudes from the bottom wall portion 28 in the puncture direction (Z1 direction). The second opening 52 is a hole for inserting a portion (a protruding wall 263 described later) of the attachment 26 (see FIG. 2 ) from the outside to the inside of the housing 12.

[0037] 1, a window 121 is provided in a part of ceiling 30. An insertion port 122 for inserting syringe pump unit 16 into housing 12 is provided at the X2 end of housing 12. An operation cover 36 is provided at the X1 end of ceiling 30. When operation cover 36 is operated (depressed), puncture unit 14 is actuated.

[0038] 3, a hole 123 is formed in the ceiling portion 30 of the housing 12. The hole 123 is covered by an operation cover 36 attached to the ceiling portion 30.

[0039] Puncture unit 14 is attached to housing 12. Puncture unit 14 includes a needle member 40, an abutment member 42, a pusher 44, a puncture biasing member 46, and a follow-up biasing member 48. Hereinafter, with regard to puncture unit 14 and its components, the direction in which needle member 40 punctures skin S (Z1 direction) will be referred to as the distal direction, and the direction opposite to the puncture direction will be referred to as the proximal direction.

[0040] As shown in FIG. 4 , the needle member 40 includes a puncture needle 60 and a needle hub 62 that holds the puncture needle 60. The needle member 40 is rotatable relative to the abutment member 42 around the axis of the needle member 40. The puncture needle 60 is hollow and protrudes from the needle hub 62. The tip of the puncture needle 60 is capable of puncturing the patient's skin S. The needle hub 62 has a hub body 622 to which the needle hub 62 is fixed and at least one guide protrusion 624 that protrudes radially outward from the hub body 622. When the needle member 40 punctures the patient's skin S, the end surface of the hub body 622 in the Z1 direction comes into contact with the skin S. In this embodiment, a pair of guide protrusions 624 are disposed on opposite sides of the hub body 622 in the circumferential direction. Each guide protrusion 624 has a locking portion 625 at its end in the Z1 direction.

[0041] In Fig. 3, the abutment member 42 is provided on the housing 12 so as to be movable along the thickness direction (Z direction) of the housing 12. The abutment member 42 is inserted into a first opening 51 of the housing 12. As shown in Fig. 4, the abutment member 42 includes a cylindrical tube portion 420 and a gate portion 426 protruding from the tube portion 420 in the Z2 direction. The needle member 40 is disposed inside the tube portion 420. The needle member 40 is movable relative to the abutment member 42 in the axial direction (Z direction) of the abutment member 42.

[0042] As shown in Fig. 3 , the Z1-direction end of the tubular portion 420 has an abutment surface 421 that can come into contact with the patient's skin S (see Fig. 9 ). The abutment member 42 has a needle outlet 422 that opens at the Z1-direction end of the tubular portion 420. The abutment surface 421 surrounds the needle outlet 422. The puncture needle 60 can protrude from the needle outlet 422.

[0043] A flange portion 423 that expands radially outward is provided at the base end of the cylindrical portion 420. The flange portion 423 has a stepped spring bearing portion 424. The flange portion 423 is provided with an anti-rotation protrusion 425 (see FIG. 4 ). The anti-rotation protrusion 425 engages with a portion of the housing 12, thereby preventing the abutment member 42 from rotating relative to the housing 12.

[0044] As shown in Figure 4, the abutment member 42 has at least one engagement step 427. The engagement step 427 is a flat surface perpendicular to the axial direction of the abutment member 42. In the initial state of the medical solution administration device 10 (see Figure 1), the locking portion 625 of the needle hub 62 abuts against the engagement step 427 of the abutment member 42. This prevents the needle hub 62 from moving relative to the abutment member 42 in the puncture direction (Z1 direction).

[0045] The cylindrical portion 420 has at least one guide groove 428 that can guide the needle member 40 in the axial direction. In this embodiment, the cylindrical portion 420 has a pair of guide grooves 428 that are provided on opposite sides of each other in the circumferential direction. The base end of each guide groove 428 is located adjacent to the engagement step 427 in the circumferential direction of the cylindrical portion 420. The guide groove 428 is recessed radially outward from the inner circumferential surface of the cylindrical portion 420 and extends along the axial direction of the abutment member 42. The guide groove 428 can receive the guide protrusion 624 of the needle member 40.

[0046] As shown in Fig. 4, the abutting member 42 has a protruding portion 429 that can protrude in the puncture direction from the first opening 51 of the housing 12. The protruding portion 429 is a part of the tubular portion 420. As shown in Fig. 4, the gate portion 426 has a pair of pillar portions 426a that extend in the proximal direction from the tubular portion 420, and a bridge portion 426b that connects the proximal ends of the pair of pillar portions 426a.

[0047] The puncture biasing member 46 is disposed between the hub body 622 of the needle hub 62 and the bridge portion 426b of the gate portion 426. The puncture biasing member 46 is a spring member made of a coil spring. The puncture biasing member 46 elastically biases the needle member 40 in the puncture direction (Z1 direction).

[0048] The pusher 44 is disposed inside the housing 12 so as to be movable relative to the housing 12 and the abutment member 42 in the axial direction (Z1 direction) of the abutment member 42. The pusher 44 is formed in an annular shape. A pair of grooves 442 is provided on the inner periphery of the pusher 44. A pair of pillar portions 426a of the gate portion 426 engage with the pair of grooves 442. This allows the gate portion 426 to guide the pusher 44 in the axial direction of the abutment member 42 and prevent the pusher 44 from rotating relative to the abutment member 42.

[0049] As shown in Fig. 3 , in the initial state of the medical solution administration device 10, the top (base end) of the pusher 44 is disposed within the hole 123 of the housing 12. The pusher 44 has at least one first inclined portion 444. The first inclined portion 444 is provided on the distal end side of the pusher 44 and faces the distal end direction (Z1 direction) of the pusher 44. In this embodiment, the pusher 44 has a pair of first inclined portions 444 disposed on opposite sides of each other in the circumferential direction. Each first inclined portion 444 is inclined with respect to the axial direction of the pusher 44.

[0050] As shown in FIG. 4 , the needle hub 62 has at least one second inclined portion 626 that abuts against the first inclined portion 444. The second inclined portion 626 faces toward the base end of the needle hub 62 (Z2 direction). In this embodiment, the needle hub 62 has a pair of second inclined portions 626 that are arranged circumferentially opposite each other. The pair of second inclined portions 626 is provided at the base ends of the pair of guide protrusions 624, respectively. Each second inclined portion 626 is inclined with respect to the axial direction (Z direction) of the needle member 40 in the same direction as the first inclined portion 444. In the initial state of the medical solution administration device 10, the pair of first inclined portions 444 and the pair of second inclined portions 626 face each other.

[0051] 3, a follow-up biasing member 48 is disposed inside the housing 12 between the cylindrical portion 420 of the abutting member 42 and the ceiling portion 30 of the housing 12. The follow-up biasing member 48 is a spring member formed of a coil spring. One end of the follow-up biasing member 48 abuts against the spring bearing portion 424 of the cylindrical portion 420. The other end of the follow-up biasing member 48 abuts against the ceiling portion 30 of the housing 12. The follow-up biasing member 48 elastically biases the abutting member 42 in the puncture direction (Z1 direction).

[0052] As shown in Figure 2, a connecting needle 70, a connecting tube 71, and a connecting cylinder 72 are arranged inside the housing 12. The connecting needle 70 is formed in a tubular shape. The connecting needle 70 extends along the X direction. The needle tip of the connecting needle 70 faces the X2 direction. The connecting needle 70 has a needle tip that can penetrate a sealing member 744, which will be described later.

[0053] The connecting tube 71 is a flexible tube for transferring the medicinal solution from the connecting needle 70 to the needle hub 62 (FIG. 4). One end of the connecting tube 71 is connected to the connecting needle 70. The other end of the connecting tube 71 is connected to the needle hub 62. The connecting cylinder 72 covers the connecting needle 70. The connecting cylinder 72 is open in the X2 direction.

[0054] Syringe pump section 16 includes a pre-filled syringe 74 and a drive unit 75. Syringe pump section 16 is disposed inside housing 12 in a state where it can slide along the longitudinal direction (X direction) of housing 12.

[0055] The prefilled syringe 74 includes a syringe body 740, a gasket 742, a sealing member 744, and a tip cap 746. The syringe body 740 is pre-filled with a medicinal solution. The syringe body 740 is made of a transparent material. A user can view the medicinal solution in the prefilled syringe 74 located inside the housing 12 through a window 121 provided in the housing 12.

[0056] Gasket 742 is made of an elastic resin material such as rubber or elastomer, and is slidably disposed inside syringe body 740. Sealing member 744 is made of an elastic resin material such as rubber or elastomer, and liquid-tightly seals the tip opening of syringe body 740. Tip cap 746 fixes sealing member 744 to the tip opening of syringe body 740.

[0057] The drive unit 75 has a plunger 750 for pressing the gasket 742 toward the distal end. Although not shown in detail, the drive unit 75 further includes a power supply unit (e.g., a battery), a motor, a power transmission mechanism, a control unit, etc.

[0058] The needle cover 18 is movably mounted relative to the housing 12. Specifically, the needle cover 18 is supported by the housing 12 so as to be rotatable around an axis along the width direction of the housing 12. A pair of support shafts 328 are provided on each of the side wall portions 320 that form both sides of the peripheral wall portion 32 of the housing 12 in the width direction. The pair of support shafts 328 protrude from the side wall portions 320 on both sides. The needle cover 18 is rotatably supported by the pair of support shafts 328.

[0059] The needle cover 18 is movable from a puncture permitting position, which permits the puncture needle 60 to puncture the skin S, to a shielding position, which covers the tip of the puncture needle 60. In Fig. 3, the needle cover 18 is in the puncture permitting position. In Fig. 13, the needle cover 18 is in the shielding position. As shown in Fig. 2, the needle cover 18 has the form of a lid-like member that partially covers the housing 12. The needle cover 18 is in a closed state in the puncture permitting position and in an open state in the shielding position.

[0060] The needle cover 18 has a first cover wall 181 facing the bottom wall 28 of the housing 12, a second cover wall 182 facing the tip wall of the housing 12, and a pair of third cover walls 183 facing the side wall portions 320 on both sides of the housing 12. Hereinafter, the first cover wall 181, the second cover wall 182, and the pair of third cover walls 183 may be collectively referred to as the "cover walls 180." The cover walls 180 are the parts of the needle cover 18 that are not holes (openings). The cover walls 180 cover the needle tip of the puncture needle 60 when the needle cover 18 is in the open state.

[0061] Needle cover 18 has an opening 81 (hereinafter referred to as first opening 81) that allows reception of puncturing unit 14 when in the closed state (puncturing allowance position). First opening 81 penetrates first cover wall 181. When needle cover 18 is in the puncturing allowance position, first opening 81 allows reception of abutment member 42. First cover wall 181 has a second opening 82 formed therein.

[0062] Needle cover 18 has a notch 83 that communicates with first opening 81. Notch 83 penetrates first cover wall 181. When needle cover 18 moves from the puncturing permitting position to the shielding position, part of puncturing portion 14 passes through notch 83.

[0063] The second cover wall 182 protrudes in the Z2 direction from the tip of the first cover wall 181 and extends in the width direction of the housing 12. The pair of third cover walls 183 protrude in the Z2 direction from both sides of the first cover wall 181 in the width direction and extend toward the base end from both sides of the second cover wall 182 in the width direction. A pair of support shafts 328 of the housing 12 are inserted into support holes 184 provided in the pair of third cover walls 183, respectively.

[0064] The medical solution administration device 10 further includes a shielding biasing member 84 that biases the needle cover 18 toward the shielding position. In this embodiment, the shielding biasing member 84 is a torsion spring. The shielding biasing member 84 has a coil portion 840, a first arm portion 841 extending from one end of the coil portion 840, and a second arm portion 842 extending from the other end of the coil portion 840. One support shaft portion 328 provided on the housing 12 is inserted into the coil portion 840. The first arm portion 841 engages with a first locking protrusion 85 provided on the housing 12. The second arm portion 842 engages with a second locking protrusion 86 provided on the needle cover 18 (specifically, one of the third cover walls 183). Note that the shielding biasing member 84 is not limited to the torsion spring described above and may be, for example, a coil spring disposed between the housing 12 and the first cover wall 181.

[0065] The sliding member 20 faces the bottom wall portion 28 of the housing 12 and is provided slidably relative to the housing 12. The sliding member 20 is movable from a pre-sliding position to a post-sliding position relative to the housing 12. In Fig. 9, the sliding member 20 is in the pre-sliding position. In Fig. 13, the sliding member 20 is in the post-sliding position.

[0066] 2 , the sliding member 20 has a sliding plate 200, a first locking portion 210, a second locking portion 220, and a pair of guide arms 230. The sliding plate 200, the first locking portion 210, and the second locking portion 220 face the bottom wall portion 28 of the housing 12. The sliding plate 200 forms the main body of the sliding member 20.

[0067] The first locking portion 210 engages with a first engaging portion 110 provided on the bottom wall portion 28 of the housing 12. The first engaging portion 110 is a hole that penetrates the bottom wall portion 28. The first engaging portion 110 may also be a groove provided on the bottom wall portion 28.

[0068] The first locking portion 210 is a movable piece that is provided so as to be movable in the thickness direction (Z direction) relative to the sliding plate 200. The first locking portion 210 is movable relative to the sliding plate 200 in a direction away from the bottom wall portion 28 of the housing 12.

[0069] The first locking portion 210 has a first plate 212 and an engaging protrusion 214. A portion of the peripheral edge of the first plate 212 is connected to the sliding plate 200 via a connecting portion 216. In the illustrated example, the connecting portion 216 is provided on one side of the peripheral edge of the first plate 212 in the width direction (Y direction), but may be provided at any position on the peripheral edge of the first plate 212. The sliding plate 200 is formed with a first notch 202 formed to surround the first locking portion 210 (first plate 212) in a C-shape. The engaging protrusion 214 protrudes toward the housing 12. In the initial state of the medicinal solution administration device 10, the engaging protrusion 214 is inserted into the first engaging portion 110.

[0070] When the housing 12 is moved away from the skin S of the living body, the first locking portion 210 is pulled by the skin S, moving away from the bottom wall portion 28 of the housing 12, and the engagement between the engagement protrusion 214 and the first engagement portion 110 is released.

[0071] The second locking portion 220 is an elastic piece having one end connected to the sliding plate 200. The sliding plate 200 has a second notch 204 formed in a U-shape to surround the second locking portion 220. The second locking portion 220 is displaceable relative to the sliding plate 200 in the thickness direction (Z direction) of the sliding plate 200. The second locking portion 220 has a second plate 222 and an engaging claw 224. The second plate 222 extends from the sliding plate 200 toward the base end of the housing 12 (X2 direction). The engaging claw 224 protrudes from a free end of the second plate 222 toward the housing 12. The engaging claw 224 has an inclined surface 225 that is inclined with respect to the movement direction of the sliding member 20.

[0072] In association with the second locking portion 220, the housing 12 has a receiving portion 124 and a second engaging portion 120. The receiving portion 124 receives the engaging claw portion 224 when the sliding member 20 is in the pre-sliding position. The receiving portion 124 is a hole that penetrates the bottom wall portion 28 of the housing 12. The receiving portion 124 may also be a groove formed in the bottom wall portion 28.

[0073] The second engaging portion 120 engages with the engaging claw portion 224 when the sliding member 20 is in the post-sliding position. The second engaging portion 120 is a hole that penetrates the bottom wall portion 28 of the housing 12. The second engaging portion 120 may be a groove formed in the bottom wall portion 28. In the housing 12, the second engaging portion 120 is formed closer to the base end than the accommodating portion 124.

[0074] The accommodating portion 124 and the second engaging portion 120 may be formed at a location other than the bottom wall portion 28 of the housing 12. For example, the accommodating portion 124 and the second engaging portion 120 may be formed at one side wall portion 320 of the housing 12. In this case, the second locking portion 220 is disposed to face one side wall of the housing 12.

[0075] The pair of guide arms 230 protrude in the Z2 direction from both widthwise ends of the sliding plate 200. Protrusions 232 provided on the pair of guide arms 230 engage with grooves 322 provided on the side wall portions 320 on both widthwise sides of the housing 12, respectively. The grooves 322 extend in the longitudinal direction (X direction) of the housing 12. The engagement of the protrusions 232 of the pair of guide arms 230 with the pair of grooves 322 guides the sliding member 20 along the longitudinal direction of the housing 12.

[0076] Needle cover 18 and sliding member 20 are connected via connecting portion 19 so as to move in conjunction with each other. Needle cover 18, connecting portion 19, and sliding member 20 are configured as a single component. In other words, needle cover 18, connecting portion 19, and sliding member 20 constitute cover member 17, which is an integrally molded product.

[0077] The connecting portion 19 extends in the width direction of the housing 12. The distal end of the connecting portion 19 is connected to the proximal end of the needle cover 18. The proximal end of the connecting portion 19 is connected to the distal end of the sliding member 20. The cover member 17 has a first groove 171 and a second groove 172 on the surface facing the bottom wall portion 28 of the housing 12. The first groove 171 is provided at the connection point between the needle cover 18 and the connecting portion 19 and extends in the width direction of the housing 12. The second groove 172 is provided at the connection point between the sliding member 20 and the connecting portion 19 and extends in the width direction of the housing 12. The cover member 17 is thin-walled at the locations of the first groove 171 and the second groove 172. Therefore, the cover member 17 can bend at the locations of the first groove 171 and the second groove 172. In another aspect, the connecting portion 19 may be configured in the form of a flexible sheet.

[0078] As described above, needle cover 18 and sliding member 20 are connected via connecting portion 19 so as to move in conjunction with each other. Therefore, when needle cover 18 is in the puncture-permitting position, sliding member 20 is in the pre-sliding position fixed to bottom wall portion 28 of housing 12 by first locking portion 210, restricting movement of needle cover 18 to the shielding position. When housing 12 is separated from the skin S of the living body, engagement between first engaging portion 110 and first locking portion 210 is released, allowing sliding member 20 to move to the post-sliding position and needle cover 18 to move to the shielding position.

[0079] The affixing member 22 is a flexible sheet-like member. The affixing member 22 is fixed to the needle cover 18 and the sliding member 20. Specifically, the affixing member 22 is fixed to the surface of the first cover wall 181 opposite to the housing 12. The affixing member 22 is fixed to the surface of the sliding member 20 opposite to the housing 12. The affixing member 22 is also fixed to the connecting portion 19. It is sufficient that the affixing member 22 is fixed to at least the sliding member 20 out of the needle cover 18, the connecting portion 19, and the sliding member 20. In other words, the affixing member 22 does not have to be fixed to at least one of the needle cover 18 and the connecting portion 19.

[0080] Although not shown in detail, the attachment member 22 has a base sheet and an attachment sheet. The base sheet is fixed to the cover member 17. The base sheet is a flexible resin sheet. Examples of materials for the base sheet include, but are not limited to, PET (polyethylene terephthalate).

[0081] The adhesive sheet is provided on the surface of the base sheet opposite to the cover member 17. The adhesive sheet has an adhesive surface 23 (adhesive surface) that can be attached to the skin S of a living body. A gripping portion 92 is provided on the outer periphery of the adhesive member 22. The gripping portion 92 does not have the adhesive surface 23.

[0082] A portion of the affixing member 22 is fixed to the first locking portion 210. Specifically, the affixing member 22 has a first locking affixing portion 94 fixed to the first locking portion 210. A locking notch 96 is formed in the affixing member 22 so as to surround the first locking affixing portion 94 in a C-shape. A C-shaped notch 241 similar to the locking notch 96 is also formed in the release sheet 24.

[0083] A second locking opening 98 is formed in a portion of the attachment member 22 corresponding to the second locking portion 220. An opening 242 similar to the second locking opening 98 is also formed in the release sheet 24. The second locking portion 220 is exposed through the second locking opening 98. Therefore, the attachment member 22 is not fixed to the second locking portion 220.

[0084] The adhesive member 22 is further formed with openings 101, 102 and a notch 103 corresponding respectively to the first opening 81, the second opening 82 and the notch 83 of the needle cover 18. Similarly, the release sheet 24 is also formed with openings 251, 252 and a notch 253 corresponding respectively to the first opening 81, the second opening 82 and the notch 83 of the needle cover 18.

[0085] The release sheet 24 is removably attached to the attachment surface 23 of the attachment member 22 in the initial state of the medicinal solution administration device 10. The release sheet 24 is removed from the attachment surface 23 when the medicinal solution administration device 10 is used. The release sheet 24 is attached to the entire attachment surface 23.

[0086] A gripping portion 91 is provided on the outer periphery of the release sheet 24. Hereinafter, the gripping portion 91 provided on the release sheet 24 will be referred to as a "first gripping portion 91." The gripping portion 92 provided on the attachment member 22 will be referred to as a "second gripping portion 92."

[0087] 1, in the initial state of the medicinal solution administration device 10, the attachment 26 is attached to the needle cover 18. The attachment 26 is detachable from the needle cover 18. Hereinafter, the state in which the attachment 26 is attached to the needle cover 18 will be referred to as the "attachment 26 attached state."

[0088] 2, the attachment 26 has an opening portion 260, a puncture seal portion 262, and a connection seal portion 264. When the attachment 26 is attached, the attachment 26 keeps the puncture portion 14 and the pre-filled syringe 74 in a sterile state.

[0089] The opening portion 260 is made of, for example, a hard resin material. The opening portion 260 is formed in a U-shape. When the attachment 26 is attached, a pair of engagement claws 261 provided at both ends of the opening portion 260 releasably engage with a pair of third cover walls 183 of the needle cover 18. When the attachment 26 is attached, a part of the adhesive member 22 is disposed between the opening portion 260 and the needle cover 18.

[0090] The puncture seal portion 262 is provided in the opening portion 260. When the attachment 26 is attached, the puncture seal portion 262 comes into close contact with the abutment surface 421 of the abutment member 42, airtightly closing the needle outlet port 422 and sealing the puncture needle 60. The connection seal portion 264 is provided on a protruding wall 263 that protrudes from the opening portion 260. When the attachment 26 is attached, the connection seal portion 264 is inserted into the second opening 52 of the housing 12, airtightly closing the opening of the tube portion 420 and sealing the connecting needle 70.

[0091] The drug solution administration device 10 is used as follows.

[0092] 1, the first locking portion 210 of the sliding member 20 is engaged with the first engaging portion 110 of the housing 12 (see FIG. 6A). Therefore, movement of the needle cover 18 to the shielding position is restricted, and even if an external force toward the shielding position acts on the needle cover 18, the needle cover 18 is maintained in the initial position, which is the puncture-permitting position.

[0093] When using the drug solution administration device 10, the user removes the attachment 26 from the needle cover 18. This releases the seal on the puncture needle 60 by the puncture seal portion 262, and also releases the seal on the connecting needle 70 by the connection seal portion 264. When the attachment 26 is removed, both widthwise ends of the adhesive member 22 that were bent by the attachment 26 return to their original shape due to elastic force. Note that, in a state where the attachment 26 is attached, the adhesive member 22 can easily deform along the shape of the needle cover 18 (or the housing 12, the attachment 26), and the base sheet of the adhesive member 22 may have cuts, grooves, or the like so that the adhesive member 22 can easily return to its original shape when the attachment 26 is removed.

[0094] As the attachment 26 is removed, the elastic biasing force of the follow-up biasing member 48 displaces the abutment member 42 in the Z1 direction relative to the housing 12, as shown in FIG. 8 . As a result, the tubular portion 420 of the abutment member 42 protrudes in the Z1 direction from the first opening 51 of the housing 12. At this time, the flange portion 423 of the abutment member 42 abuts against the bottom wall portion 28 of the housing 12, and the displacement of the abutment member 42 stops. As the abutment member 42 displaces, the needle member 40 supported by the abutment member 42 also displaces in the Z1 direction relative to the housing 12. At this time, there is no relative displacement between the abutment member 42 and the needle member 40.

[0095] 2 into the housing 12. This causes the connecting needle 70 to penetrate the sealing member 744 of the prefilled syringe 74, allowing the medicinal liquid in the prefilled syringe 74 to be delivered to the puncture needle 60.

[0096] Next, the user pinches the first gripping portion 91 with their fingers and peels the release sheet 24 from the adhesive member 22 to expose the adhesive surface 23 of the adhesive member 22. After peeling the release sheet 24, the user attaches the adhesive surface 23 to the skin S of a living body, as shown in Fig. 9. When attaching the adhesive surface 23 to the skin S of a living body, as shown in Fig. 10, the abutting member 42 is pressed by the skin S and is displaced in the Z2 direction relative to the housing 12, dragging the needle member 40 along with it, against the biasing force of the following biasing member 48. As a result, the tubular portion 420 of the abutting member 42 is housed again within the housing 12, and the abutting surface 421 of the abutting member 42 and the tip 341 of the annular protrusion 34 become substantially flush with each other.

[0097] Next, the user pushes the pusher 44 in the Z1 direction via the operation cover 36. This causes the pusher 44 to be displaced in the Z direction relative to the abutment member 42. As the pusher 44 is displaced in the Z direction relative to the abutment member 42, the needle hub 62 rotates around the axis of the needle hub 62 relative to the abutment member 42 due to the action of the first inclined portion 444 and the second inclined portion 626. When the needle hub 62 rotates and the pair of guide protrusions 624 reach the pair of guide grooves 428 of the abutment member 42, the elastic biasing force of the puncture biasing member 46 inserts the pair of guide protrusions 624 into the pair of guide grooves 428 of the abutment member 42, and the needle hub 62 is displaced in the Z1 direction (puncture direction).

[0098] As a result, the puncture needle 60 punctures the patient's skin S, as shown in Figure 11. In Figure 11, the needle cover 18 is held in the puncture-permitting position, so the puncture needle 60 punctures the skin S through the first opening 81 of the needle cover 18. Therefore, the needle cover 18 does not prevent the puncture needle 60 from puncturing the skin S.

[0099] After the puncture needle 60 has completely punctured the skin S, the user turns on the power of the medicinal solution administration device 10, and the motor advances the plunger 750 and the gasket 742 (see FIG. 2 ) via the power transmission mechanism, thereby administering the medicinal solution to the living body.

[0100] When the administration of the medicinal solution to the living body is completed and the medicinal solution administration device 10 is to be removed from the skin S, the second gripping portion 92 ( FIG. 2 ) of the adhesive member 22 is grasped with the fingers and the adhesive member 22 is pulled up in a direction away from the skin S. At this time, as shown in FIG. 12 , the portion of the adhesive member 22 other than the first locking adhesive portion 94 peels off from the skin S before the first locking adhesive portion 94 peels off from the skin S. In other words, the first locking adhesive portion 94 peels off from the skin S later than the portion of the adhesive member 22 other than the first locking adhesive portion 94.

[0101] Because the first locking adhesive portion 94 is fixed to the first locking portion 210, the first locking portion 210 is displaced in the Z1 direction relative to the sliding plate 200. As a result, as shown in Fig. 6B , the engaging protrusion 214 disengages from the first engaging portion 110, and the first locking portion 210 is disengaged from the first engaging portion 110. As the engagement between the first locking portion 210 and the first engaging portion 110 is released, the sliding member 20 becomes displaceable in the proximal direction (X2 direction) relative to the housing 12.

[0102] Furthermore, the needle cover 18, which is connected to the sliding member 20 via the connecting portion 19, is also movable relative to the housing 12. Therefore, as the first locking portion 210 and the first engaging portion 110 are disengaged, the biasing force of the shielding biasing member 84 displaces the needle cover 18 from the puncture permitting position to the shielding position, as shown in FIG. 13 , and the sliding member 20 displaces from the pre-sliding position to the post-sliding position. As a result, the puncture needle 60 is covered by the needle cover 18, which is in the shielding position. When the needle cover 18 moves from the puncture permitting position to the shielding position, the needle tip of the puncture needle 60 passes through the notch 83 (see FIG. 2 ) of the needle cover 18. Therefore, the movement of the needle cover 18 to the shielding position is not obstructed by the puncture needle 60.

[0103] When the sliding member 20 is displaced from the pre-slide position to the post-slide position, the second locking portion 220 of the sliding member 20 moves as follows.

[0104] 7A , when the sliding member 20 is in the pre-slide position, the engaging claw 224 of the second locking portion 220 is inserted into the accommodating portion 124. When the sliding member 20 begins to displace toward the post-slide position, the inclined surface 225 of the engaging claw 224 of the second locking portion 220 comes into sliding contact with the accommodating portion 124, and the second locking portion 220 elastically deforms in a direction (Z1 direction) away from the accommodating portion 124 of the housing 12. Therefore, the engaging claw 224 can easily be released from the accommodating portion 124.

[0105] 7B , when the sliding member 20 reaches the post-sliding position, the second locking portion 220 is displaced in the Z2 direction due to its elastic restoring force, and the engaging claw portion 224 is inserted into the second engaging portion 120. As a result, the second locking portion 220 engages with the second engaging portion 120, restricting the sliding member 20 from moving toward the pre-sliding position. In other words, the sliding member 20 is fixed in the post-sliding position by the second locking portion 220.

[0106] This embodiment has the following advantages.

[0107] As shown in Fig. 6A, in the drug solution administration device 10, when the needle cover 18 is in the puncture-permitting position, the sliding member 20 is in a pre-slide position fixed to the bottom wall of the housing 12 by the first locking portion 210, restricting movement of the needle cover 18 to the shielding position. When the housing 12 is separated from the skin S of the living body, as shown in Fig. 6B, the engagement between the first engaging portion 110 and the first locking portion 210 is released, allowing the sliding member 20 to move to the post-slide position and the needle cover 18 to move to the shielding position.

[0108] As described above, in the initial state of the medicinal solution administration device 10, the first locking unit 210 restricts the movement of the needle cover 18 to the shielding position, so that the skin S of a living body can be punctured by the puncture needle 60 without covering the tip of the puncture needle 60 with the needle cover 18. On the other hand, after the medicinal solution is administered, the restriction on the movement of the needle cover 18 by the first locking unit 210 is released by moving the housing 12 away from the skin S of the living body, so that the tip of the puncture needle 60 can be covered by the needle cover 18.

[0109] A part of the adhesive member 22 (first locking adhesive portion 94) is fixed to the first locking portion 210. When the housing 12 is separated from the skin S of the living body, the first locking portion 210 is pulled by the skin S, and is separated from the bottom wall portion 28 of the housing 12, thereby disengaging from the first engaging portion 110. This makes it possible to link the movement of the housing 12 away from the skin S of the living body with the disengagement of the first locking portion 210 and the first engaging portion 110 using a simple structure.

[0110] The first locking portion 210 is a movable piece provided so as to be movable relative to the sliding plate 200 of the sliding member 20. A portion of the peripheral edge of the first locking portion 210 is connected to the sliding plate 200. This allows the first locking portion 210 to be separated from the first engaging portion 110 with a simple configuration when the housing 12 is separated from the skin S of the living body.

[0111] 7A , the sliding member 20 has a second locking portion 220 that can engage with a second engaging portion 120 provided on the housing 12. When the sliding member 20 is in the post-sliding position, the second locking portion 220 engages with the second engaging portion 120, restricting the sliding member 20 from moving toward the pre-sliding position. With this configuration, the second locking portion 220 fixes the sliding member 20 in the post-sliding position, preventing the needle cover 18 from returning to the puncture-permitted position.

[0112] The second locking portion 220 is an elastic piece having one end connected to the sliding plate 200 of the sliding member 20. This allows the second locking portion 220 to be engaged with the second engaging portion 120 of the housing 12 with a simple structure when the sliding member 20 reaches the post-sliding position.

[0113] The second locking portion 220 has an engaging claw portion 224 provided with an inclined surface 225. The housing 12 has an accommodating portion 124 that accommodates the engaging claw portion 224 when the sliding member 20 is in the pre-slide position. When the sliding member 20 moves from the pre-slide position to the post-slide position, the inclined surface 225 comes into sliding contact with the accommodating portion 124, and the second locking portion 220 deforms in a direction away from the accommodating portion 124, causing the engaging claw portion 224 to disengage from the accommodating portion 124. With this configuration, the inclined surface 225 is provided on the engaging claw portion 224 of the second locking portion 220, so that the engaging claw portion 224 can be smoothly disengaged from the accommodating portion 124.

[0114] The adhesive member 22 is not fixed to the second locking part 220. With this configuration, when the adhesive member 22 is peeled off from the skin S, the second locking part 220 can be prevented from being pulled by the skin S and being deformed.

[0115] 2, needle cover 18 has the form of a lid-like member that partially covers housing 12, and is in a closed state in the puncture-permitting position and an open state in the shielding position. Needle cover 18 has an opening 81 that allows reception of puncture unit 14 in the closed state, and a cover wall 180 that covers the tip of puncture needle 60 in the open state. This configuration makes it possible to realize needle cover 18 with a simple structure that does not hinder activation of puncture unit 14 in the closed state and that adequately covers the tip of puncture needle 60 in the open state.

[0116] 3, the puncture unit 14 has a contact member 42 that is provided so as to be movable relative to the housing 12. The puncture needle 60 is movable relative to the contact member 42 and can protrude from a contact surface 421 of the contact member 42 toward the skin S. When the relative position between the housing 12 and a portion of the skin S that faces the contact surface 421 changes while the housing 12 is placed on the skin S, the contact member 42 moves relative to the housing 12 so as to maintain contact between the contact surface 421 and the skin S.

[0117] 14 , when the facing portion S1 of the skin S moves away from the housing 12 and the needle cover 18 in the Z1 direction, the abutment member 42, which is biased in the Z1 direction by the tracking biasing member 48, moves relative to the housing 12 so as to maintain contact of the abutment surface 421 with the facing portion S1. Therefore, when the skin S of a living body is punctured by the puncture needle 60, even if the relative position between the housing 12 and the skin S changes due to bodily movement of the living body, the abutment member 42 moves relative to the housing 12 so as to follow the skin S. This effectively prevents the puncture needle 60 from coming out of the skin S, and effectively maintains the puncture of the skin S by the puncture needle 60.

[0118] 2, needle cover 18 has a notch 83 that communicates with first opening 81. When needle cover 18 moves from the puncture-permitting position to the shielding position, part of puncturing portion 14 passes through notch 83. With this configuration, the wall area of ​​needle cover 18 is ensured to be sufficient to adequately cover the tip of puncture needle 60, and the provision of notch 83 allows needle cover 18 to be moved to the shielding position without hindrance.

[0119] The medical solution administration device 10 includes a shielding biasing member 84 that biases the needle cover 18 toward the shielding position. With this configuration, when the engagement between the first locking portion 210 and the first engaging portion 110 is released, the biasing force of the shielding biasing member 84 can automatically move the needle cover 18 to the shielding position.

[0120] The needle cover 18, the connecting portion 19, and the sliding member 20 are configured as a single component, which makes it possible to prevent an increase in the number of components.

[0121] The needle cover 18, the connecting portion 19, and the sliding member 20 do not have to be configured as a single component. For example, in the configuration shown in Fig. 15, the connecting portion 190 according to a modified example is part of the adhesive member 22. The adhesive member 22 is fixed to the needle cover 18 and the sliding member 20. In this configuration, the needle cover 18 and the sliding member 20 are independent components. The needle cover 18 and the sliding member 20 are connected via the connecting portion 190, which is part of the adhesive member 22. This allows the movement of the needle cover 18 and the movement of the sliding member 20 relative to the housing 12 to be linked.

[0122] The present invention is not limited to the above disclosure, and various configurations can be adopted without departing from the gist of the present invention.

Claims

1. A drug solution administration device comprising: a puncture section having a puncture needle capable of puncturing the skin of a living body for administering a drug solution; a housing that accommodates the puncture section and has a bottom wall section from which the puncture needle can protrude; a needle cover movably provided with respect to the housing; a sliding member that faces the bottom wall section of the housing and is slidably provided with respect to the housing; and an attachment member that is fixed to the sliding member and has an attachment surface that can be attached to the skin of the living body, wherein the needle cover is movable from a puncture allowance position that allows the puncture needle to puncture the skin to a shielding position that covers the tip of the puncture needle, the needle cover and the sliding member are connected via a connecting member so as to interlock with each other, the sliding member has a first locking section that engages with a first engagement section provided on the housing, and when the needle cover is in the puncture allowance position, the sliding member is in a pre-sliding position fixed to the housing by the first locking section, and restricts movement of the needle cover to the shielding position, When the housing is moved away from the skin of the living body, the engagement between the first engagement portion and the first locking portion is released, allowing the sliding member to move to a post-sliding position and the needle cover to move to the shielding position.

2. A drug solution administration device as described in claim 1, wherein a portion of the adhesive member is fixed to the first locking portion, and when the housing is moved away from the skin of the living body, the first locking portion is pulled by the skin, thereby moving away from the bottom wall portion of the housing and disengaging from the first engagement portion.

3. A medicinal liquid administration device as described in claim 2, wherein the sliding member has a sliding plate connected to the needle cover via the connecting portion, the first locking portion is a movable piece movable relative to the sliding plate, and a portion of the peripheral portion of the first locking portion is connected to the sliding plate.

4. A medicinal liquid administration device as described in claim 1, wherein the sliding member has a second locking portion engageable with a second engagement portion provided on the housing, and when the sliding member is in the post-sliding position, the second locking portion engages with the second engagement portion to restrict the sliding member from moving toward the pre-sliding position.

5. A medicinal liquid administration device as described in claim 4, wherein the sliding member has a sliding plate connected to the needle cover via the connecting portion, and the second locking portion is an elastic piece one end of which is connected to the sliding plate.

6. A medicinal liquid administration device as described in claim 5, wherein the second locking portion has an engaging claw portion provided with an inclined surface that is inclined with respect to the direction of movement of the sliding member, the housing has a storage portion constituted by a groove or hole that stores the engaging claw portion when the sliding member is in the pre-slide position, and the second engagement portion is a groove or hole that engages with the engaging claw portion when the sliding member is in the post-slide position, and when the sliding member moves from the pre-slide position to the post-slide position, the inclined surface slides against the storage portion, and the second locking portion deforms in a direction away from the storage portion, thereby causing the engaging claw portion to disengage from the storage portion.

7. A drug solution administration device according to claim 6, wherein the attachment member is not fixed to the second locking portion.

8. A medicinal solution administration device as described in claim 1, wherein the needle cover has the form of a lid-like member that partially covers the housing, is in a closed state in the puncture-permitting position, and is in an open state in the shielding position, and the needle cover has an opening that allows the puncture part to be received in the closed state, and a cover wall that covers the tip of the puncture needle in the open state.

9. A medicinal solution administration device as described in claim 8, wherein the puncture section has an abutment member having an abutment surface that contacts the skin, the abutment member is movably arranged relative to the housing, and the abutment surface can protrude from the bottom wall portion, the opening allows the abutment member to be received when the needle cover is in the puncture-permitting position, the puncture needle is movable relative to the abutment member and can protrude from the abutment surface towards the skin, and when the relative position of the housing and the part of the skin facing the abutment surface changes while the housing is placed on the skin, the abutment member moves relative to the housing so as to maintain contact between the abutment surface and the skin.

10. A medicinal liquid administration device as described in claim 8, wherein the needle cover has a cutout portion communicating with the opening, and when the needle cover moves from the puncture-permitting position to the shielding position, a part of the puncture portion passes through the cutout portion.

11. A drug solution administration device according to any one of claims 1 to 10, further comprising a shielding biasing member for biasing the needle cover towards the shielding position.

12. A medicinal liquid administration device according to any one of claims 1 to 10, wherein the needle cover, the connecting portion and the sliding member are configured as a single component.

13. A medicinal liquid administration device according to any one of claims 1 to 10, wherein the attachment member is fixed to the needle cover and the sliding member, and the connecting portion is a part of the attachment member.

Images