Drug solution administration device

Abstract

To provide a liquid medicine administration device which enables a user to easily recognize that the administration of a liquid medicine is completed.SOLUTION: The drug solution administration device 10 includes a completion signal generation unit 15 that generates a completion signal for recognizing completion of subcutaneous administration of the drug solution to the patient. A completion signal generation part 15 advances an indicator member 150 at a first speed by a delay structure 158 after the indicator member 150 starts to move in the distal end direction with the relative movement of the trigger member. After the delay of the indicator member 150 by the delay structure 158 is released, the indicator member 150 is advanced at a second speed faster than the first speed, and the completion signal is generated by colliding the indicator member 150 with the first collision part 156.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present disclosure relates to a drug solution administration device. [Background technology]

[0002] Japanese Patent Publication No. 6154061 discloses a drug solution administration device. The drug solution administration device includes a cylindrical casing, a syringe housed inside the casing and filled with drug solution, and a cap removably attached to the tip of the casing. When a user administers drug solution, the user presses the tip of the casing against the skin, causing a puncture needle to protrude from the tip of the casing, which then punctures the skin to administer the drug solution subcutaneously. After confirming that administration of the drug solution is complete, the user moves the tip of the casing away from the skin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6154061 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above-described medicinal liquid administration device, it is desirable that the user can easily recognize that administration of the medicinal liquid has been completed.

[0005] The present disclosure aims to solve the above-mentioned problems. [Means for solving the problem]

[0006] (1) An aspect of the present disclosure is a drug solution administration device comprising: a housing; a cylindrical body accommodated in the housing and filled with a drug solution; a syringe having a puncture needle communicating with the cylindrical body and administering the drug solution into a living body; a trigger member that moves relative to the housing in a proximal direction when pressed against a target to be punctured; a plunger provided inside the housing, movable relative to the syringe in a distal direction as the trigger member moves relative to the proximal direction, and discharging the drug solution from the puncture needle by moving in the distal direction; and a completion signal generating unit that generates a completion signal to acknowledge completion of administration of the drug solution into the living body after administration of the drug solution into the living body is completed, the completion signal generating unit being provided inside the housing. the indicator member is attached to the housing and is movable relative to the housing in the distal direction in accordance with the relative movement of the trigger member; a first spring that urges the indicator member in the distal direction; a first collision target that collides with the indicator member when it moves in the distal direction; and a delay structure that controls the speed at which the indicator member moves in the distal direction to a first speed, wherein after the indicator member starts to move in the distal direction, the delay structure causes the indicator member to advance at the first speed, and after the delay of the indicator member caused by the delay structure is released, the indicator member advances at a second speed faster than the first speed and collides with the first collision target, thereby generating the completion signal.

[0007] According to this medicinal liquid administration device, a completion signal is generated after administration of the medicinal liquid is completed, so that the user can recognize it, thereby enabling the medicinal liquid to effectively penetrate into the living body after administration is completed.

[0008] (2) In the drug solution administration device described in (1) above, the completion signal generating unit includes a guide member that supports the indicator member so that it can move axially, and the delay structure has a delay member provided between the indicator member and the guide member, and the delay member is held by one of the indicator member and the guide member and may be slidable relative to the other of the indicator member and the guide member.

[0009] With this configuration, the delay member can effectively slow down and delay the rate of distal movement of the indicator member.

[0010] (3) In the drug solution administration device described in (2) above, the delay member may be fixed to the indicator member, and when the indicator member has moved a predetermined distance since it began to move toward the tip, the delay member may move away from the guide member, thereby releasing the sliding between the delay member and the guide member.

[0011] With this configuration, the reduction in the moving speed of the indicator member due to sliding between the delay member and the guide member is effectively eliminated, and the indicator member can be advanced toward the distal end at the second speed.

[0012] (4) In the drug solution administration device described in any one of (1) to (3) above, the first collision target portion may be arranged to face the tip end of the indicator member in the axial direction, and when the indicator member moves in the tip end direction, the tip end may collide with the first collision target portion.

[0013] (5) In the drug solution administration device described in any one of (1) to (3) above, the indicator member has a protruding portion that protrudes radially outward, and the first collision portion is formed on the guide member so as to face the protruding portion of the indicator member in the axial direction, and when the indicator member moves in the tip direction, the protruding portion may collide with the first collision portion.

[0014] With this configuration, the guide member also functions as the first collision receiving portion, thereby simplifying the structure.

[0015] (6) In the drug solution administration device described in any one of (1) to (5) above, the indicator member has a first elastic part that is elastically deformable in the radial direction, and the first elastic part has a first flexible part extending along the axial direction of the indicator member and a first flange part provided at a base end of the first flexible part and protruding radially outward from the first flexible part, and the completion signal generation part comprises a first reduced diameter part provided radially outward from the indicator member and protruding radially inward toward the indicator member, and a first lock pin provided so as to be movable relative to the housing in the axial direction and inserted inside the first elastic part to prevent elastic deformation of the first elastic part radially inward, and Before the indicator member moves in the distal direction relative to the housing, the first flange portion and the base end of the first reduced diameter portion abut in the axial direction, and the first lock pin can move in the proximal direction due to relative movement of the trigger member in the proximal direction, and when the first lock pin moves in the proximal direction from an elastic deformation prevented state in which the first lock pin is inserted into the first elastic portion and the elastic deformation of the first elastic portion in the radially inward direction is prevented, the first lock pin may move out of the interior of the first elastic portion and the elastic deformation prevented state of the first elastic portion is released, and the first elastic portion may elastically deform in the radially inward direction, causing the indicator member to move in the distal direction.

[0016] With this configuration, as the trigger member is moved relatively in the proximal direction, the first elastic portion is brought into an elastically deformable state, and the indicator member can be effectively moved in the distal direction.

[0017] (7) In the drug solution administration device described in any one of (1) to (6) above, a start signal generating unit is provided which generates a start signal to notify the patient of the time to start administering the drug solution into the living body as the plunger moves toward the tip. The start signal generating unit has a second elastic portion provided on the plunger and elastically deformable in the radial direction, a second reduced diameter portion provided radially outward from the plunger and protruding radially inward toward the plunger, and a second collision portion provided further toward the tip than the second reduced diameter portion. As the plunger moves toward the tip of the housing, the second elastic portion is pushed radially inward by the second reduced diameter portion and elastically deforms, and after the second elastic portion passes the second reduced diameter portion, the second elastic portion elastically restores radially outward and collides with the second collision portion, thereby generating the start signal.

[0018] This configuration allows the user to effectively recognize not only the completion of administration of the medicinal liquid, but also the administration start time when administration of the medicinal liquid has begun.

[0019] (8) In the drug solution administration device described in any one of (1) to (7) above, the plunger is biased toward the distal end direction by a resilient force of a second spring provided inside the housing, the second elastic part has a second flexible part extending along the axial direction of the plunger, and a second flange part provided at a base end of the second flexible part and protruding radially outward from the second flexible part, and before the plunger moves in the distal end direction relative to the housing, the second flange part and the base end of the second reduced diameter part abut against each other in the axial direction, and the drug solution administration device is movably provided inside the housing, and is inserted into the second elastic part to bias the second elastic part radially outward. The plunger may be provided with a second lock pin capable of preventing inward elastic deformation, and the second lock pin may be movable in the base end direction by relative movement of the trigger member, and when the second lock pin moves in the base end direction from an elastic deformation prevented state in which the second lock pin is inserted into the second elastic portion and the elastic deformation of the second elastic portion in the radially inward direction is prevented, the second lock pin moves out of the interior of the second elastic portion and the elastic deformation prevented state of the second elastic portion is released, and the second elastic portion elastically deforms inward in the radial direction, causing the plunger to move in the tip end direction, and the second flange collides with the second collision portion in the start signal generating portion, generating the start signal.

[0020] With this configuration, relative movement of the trigger member in the proximal direction triggers the second elastic portion to be in an elastically deformable state, thereby effectively moving the plunger in the distal direction.

[0021] (9) In the drug solution administration device described in (8) above, the second lock pin may have an extension portion that abuts against the first lock pin in the axial direction of the housing, and the second lock pin may move toward the base end due to relative movement of the trigger member, and as the second lock pin moves toward the base end, the first lock pin may be pushed by the extension portion of the second lock pin and move toward the base end.

[0022] With this configuration, the first lock pin and the second lock pin can be effectively interlocked with each other in accordance with the relative movement of the trigger member in the proximal direction.

[0023] (10) In the drug solution administration device described in (8) or (9) above, before the plunger moves toward the tip end relative to the housing, the first inner wall of the first elastic part and the first lock pin are in contact, and the second inner wall of the second elastic part and the second lock pin are in contact, and as the trigger member moves relative to the base end toward the base end, the first lock pin disengages from the first elastic part and the contact between the first inner wall and the first elastic part is released, and then the second lock pin disengages from the second elastic part and the contact between the second inner wall and the second elastic part is released.

[0024] With this configuration, the indicator member starts moving before the plunger, so that even if the user determines that the pressing force (relative movement) of the trigger member is sufficient and releases the pressing force due to the start signal from the plunger, the indicator member can generate a completion signal. [Effects of the Invention]

[0025] According to the present disclosure, the completion signal generating unit generates a completion signal to notify the user that the administration of the medicinal liquid into the living body has been completed after the administration of the medicinal liquid has been completed, and includes a delay structure that controls the speed of movement of the indicator member toward the distal end to a first speed. After the indicator member starts to move toward the distal end and proceeds at the first speed, the delay of the indicator member caused by the delay structure is released, and the indicator member proceeds at a second speed and collides with the first collision target, generating the completion signal. This allows the user to recognize the completion signal after the administration of the medicinal liquid has been completed, thereby enabling effective penetration of the medicinal liquid into the living body after the administration of the medicinal liquid has been completed. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is an external perspective view of a drug solution administration device according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view of the drug solution administration device shown in FIG. [Figure 3] 3 is an enlarged cross-sectional view of a distal housing of the drug solution administration device shown in FIG. 2. FIG. [Figure 4] FIG. 4 is an enlarged cross-sectional view of the start signal generating section. [Figure 5] FIG. 5 is a first explanatory diagram illustrating the operation of the start signal generating unit. [Figure 6] FIG. 6 is a second explanatory diagram illustrating the operation of the start signal generating unit. [Figure 7] FIG. 7 is a third explanatory diagram illustrating the operation of the start signal generating unit. [Figure 8] 8 is an enlarged cross-sectional view of a completion signal generating unit of the chemical solution administration device shown in FIG. 2. FIG. [Figure 9] FIG. 9 is an exploded perspective view of the completion signal generating unit. [Figure 10] FIG. 10 is a first explanatory diagram illustrating the operation of the completion signal generating unit. [Figure 11] FIG. 11 is a second explanatory diagram illustrating the operation of the completion signal generating unit. [Figure 12] FIG. 12 is a third explanatory diagram illustrating the operation of the completion signal generating unit. [Figure 13] FIG. 13 is a fourth explanatory diagram illustrating the operation of the completion signal generating unit. [Figure 14] FIG. 14 is a first overall explanatory diagram of the drug solution administration device when in use. [Figure 15] FIG. 15 is a second overall explanatory diagram of the drug solution administration device when in use. [Figure 16] FIG. 16 is a third overall explanatory diagram of the drug solution administration device when in use. [Figure 17] FIG. 17 is an enlarged cross-sectional view of a completion signal generating unit of a chemical solution administration device according to a second embodiment of the present disclosure. [Figure 18] FIG. 18 is a first explanatory diagram of the operation of the completion signal generating unit of FIG. [Figure 19] FIG. 19 is a second explanatory diagram illustrating the operation of the completion signal generating unit of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] As shown in FIG. 1, a medicinal solution administration device 10 according to the first embodiment is used, for example, to administer a medicinal solution M subcutaneously to a user, that is, a patient K (living body; see FIG. 14). As shown in FIG. 2, the medicinal solution administration device 10 includes a housing 12 formed in a hollow cylindrical shape, a trigger member 14 movable relative to the housing 12, a syringe 16 housed inside the trigger member 14, and a completion signal generating unit 15. Before use, the medicinal solution administration device 10 has a cap 18 attached to the tip of the housing 12. When using the medicinal solution administration device 10, the cap 18 can be removed from the housing 12 (see FIG. 14).

[0028] The housing 12 is made of a resin material. The housing 12 extends axially (in the direction of arrows A and B). The housing 12 includes a distal housing 12A and a proximal housing 12B connected to the proximal end of the distal housing 12A. The proximal housing 12B and the distal housing 12A are arranged coaxially in the drug solution administration device 10. Note that the configuration is not limited to the distal housing 12A and the proximal housing 12B. For example, the distal housing 12A and the proximal housing 12B may be integrated into a single housing.

[0029] 3, the distal housing 12A has a main body 20, a sleeve body 22 housed on the proximal end side (direction of arrow A) of the main body 20, and an intermediate cap 24 that closes the proximal end of the main body 20. A syringe 16 is housed inside the distal housing 12A.

[0030] The main body 20 is tubular and long in the axial direction (the direction of arrows A and B). The distal end and proximal end of the main body 20 are each open. As shown in FIG. 1, the peripheral wall of the main body 20 is provided with a window 26. The window 26 allows the medicinal liquid M in the syringe 16 to be observed from outside the distal housing 12A.

[0031] 3, the sleeve body 22 is hollow and includes a cylindrical main body 30, an expanded diameter portion 32 formed at the base end of the main body 30, and a pair of body tip portions 33 protruding from the tip of the main body 30.

[0032] The main body 30 is provided with a plurality of guide ribs 34 inside. Each of the guide ribs 34 protrudes radially inward from the inner circumferential surface of the main body 30. Each of the guide ribs 34 extends along the axial direction of the sleeve body 22.

[0033] The sleeve body 22 is housed inside the tip-side housing 12A (main body 20) from the base end of the main body 20. The expanded diameter portion 32 engages with the inner circumferential portion of the main body 20. The sleeve body 22 is fixed inside the tip-side housing 12A with the base end of the expanded diameter portion 32 positioned a predetermined distance from the base end of the main body 20 in the tip direction (direction of arrow B).

[0034] A sleeve spring 40 is disposed between the outer peripheral surface of the main body 30 and the inner peripheral surface of the tip-side housing 12A. The sleeve spring 40 is a resilient member made of a coil spring. The base end of the sleeve spring 40 is engaged with the tip of the expanded diameter portion 32. The tip end of the sleeve spring 40 is engaged with a slide member 56, which will be described later. The resilient force of the sleeve spring 40 urges the slide member 56 in a direction that moves it away from the sleeve body 22, i.e., in the tip direction (direction of arrow B).

[0035] The second lock pin 44 is provided so as to be axially movable inside the tip-end housing 12A and the sleeve body 22. Hereinafter, the lock pin 44 will be referred to as the "second lock pin 44." Before use of the medical solution administration device 10, the second lock pin 44 is arranged so as to straddle the expanded diameter portion 32 and the main body 30 in the axial direction of the sleeve body 22. The second lock pin 44 has a cylindrical pin main body 462, a pair of arm portions 472 provided radially outward from the pin main body 462, and a pair of extension portions 48.

[0036] As shown in FIG. 4, the pin body 462 is provided at the center of the second lock pin 44. The pin body 462 has a hole 492. The hole 492 is formed inside the pin body 462. The hole 492 extends along the axial direction of the pin body 462. The base end of the pin body 462 is provided with an end wall 502. The end wall 502 is perpendicular to the axial direction of the pin body 462. The end wall 502 extends radially outward from the pin body 462. The hole 492 of the pin body 462 penetrates the end wall 502.

[0037] As shown in FIG. 3 , the pair of arm portions 472 are provided at the base end of the pin body 462. The pair of arm portions 472 are connected to the outer edge of the end wall portion 502. The pair of arm portions 472 extend from the end wall portion 502 toward the tip. The pair of arm portions 472 are arranged parallel to the pin body 462 and spaced apart radially outward from the pin body 462. The tip of the arm portion 472 is provided with an engagement end 52 and a locking claw (not shown) that engages with the sleeve body 22. The locking claw is supported by the sleeve body 22. A second lock pin 44 is supported movably along the axial direction of the sleeve body 22.

[0038] The pair of extending portions 48 are connected to the outer edge of the end wall portion 502. The pair of extending portions 48 extend from the end wall portion 502 in the proximal direction (the direction of arrow A). Each of the pair of extending portions 48 and each of the pair of arm portions 472 are arranged linearly. A portion of the pair of extending portions 48 is arranged inside the proximal housing 12B through a through-hole 243 of the intermediate cap 24, which will be described later. The proximal end of the extending portion 48 faces a lock pin 124 (first lock pin 124), which will be described later (see FIG. 2).

[0039] A slide member 56 is further provided inside the main body 20 of the tip side housing 12A. The slide member 56 is formed in a cylindrical shape. The slide member 56 is provided in the tip direction (direction of arrow B) of the second lock pin 44. The slide member 56 is arranged inside the main body 20 of the tip side housing 12A so as to be movable in the axial direction (direction of arrows A and B). The slide member 56 is provided radially outward of the sleeve body 22.

[0040] The slide member 56 has a cylindrical sleeve main body 561, a tubular portion 562 disposed at the tip of the sleeve main body 561, and a pair of engagement arms 563 extending from the base end of the sleeve main body 561. The main body 30 of the sleeve body 22 and the arm portion 472 of the second lock pin 44 are inserted into the sleeve main body 561. The arm portion 472 is guided along the axial direction of the sleeve main body 561.

[0041] The pair of engagement arms 563 are disposed symmetrically about the axis of the slide member 56. Each engagement arm 563 protrudes toward the base end of the slide member 56. The engagement arms 563 have a slit hole 58. The slit hole 58 is formed along the extension direction of the engagement arm 563. The base end of the slit hole 58 has a protruding piece 60 that protrudes from the base end of the engagement arm 563 toward the tip. A part of the arm portion 472 of the second lock pin 44 is inserted into the slit hole 58. The engagement end 52 of the second lock pin 44 is engageable with the tip of the slit hole 58. The protruding portion of the arm portion 472 is engageable with the protruding piece 60. This engages the second lock pin 44 with the slide member 56, preventing the second lock pin 44 from coming off the slide member 56 in the base end direction.

[0042] The end guide 62 has a cylindrical portion 621 and is disposed toward the tip of the slide member 56. The end guide 62 and the slide member 56 are positioned relative to each other in the circumferential direction. A plunger 64 is inserted into the end guide 62 so as to be movable in the axial direction.

[0043] The body tip portion 33 of the sleeve body 22 engages with the inner circumferential surface of the end guide 62. The engagement between the end guide 62 and the body tip portion 33 positions the sleeve body 22 and the end guide 62 in the axial direction. Relative rotation between the sleeve body 22 and the end guide 62 is prevented. The tip of the end guide 62 abuts against the flange 92 of the syringe 16. The end guide 62 biases the syringe 16 toward the tip (direction of arrow B).

[0044] As shown in FIG. 4, the intermediate cap 24 is provided at the base end of the tip-side housing 12A. The intermediate cap 24 has a lid portion 241 and a shaft portion 242 extending from the lid portion 241 toward the tip (direction of arrow B). The lid portion 241 is formed in a disk shape. The lid portion 241 closes the base end of the main body 20. As shown in FIG. 3, the lid portion 241 has a pair of through holes 243. The through holes 243 penetrate the lid portion 241 in the thickness direction (axial direction). A pair of extension portions 48 are inserted into each of the through holes 243.

[0045] The shaft portion 242 is a shaft body extending in the axial direction from the center of the cover portion 241. The shaft portion 242 is housed inside the main body 20 and the sleeve body 22. The shaft portion 242 is arranged on the axis of the main body 20. A portion of the shaft portion 242 is inserted into the hole portion 492 of the second lock pin 44 and the inside of the plunger 64. An injection spring 70 is inserted around the outer periphery of the shaft portion 242. Hereinafter, the injection spring 70 will be referred to as the "second spring 70." A portion of the second spring 70 is housed inside the plunger 64 together with the shaft portion 242. The second spring 70 is a coil spring. The second spring 70 is provided between the plunger 64 and the cover portion 241.

[0046] As shown in FIG. 3, the plunger 64 has a cylindrical shape that is long in the axial direction (the direction of arrows A and B). The plunger 64 is accommodated inside the tip-side housing 12A and the sleeve body 22 so as to be able to move in the axial direction. The plunger 64 includes a cylindrical rod main body 72, a mounting portion 74 formed at the tip end of the rod main body 72, and an elastic portion 76 (see FIG. 4) that is elastically deformable in the radial direction. Hereinafter, the elastic portion 76 will be referred to as a "second elastic portion 76." As shown in FIG. 3, the plunger 64 is disposed coaxially with the sleeve body 22 and the end guide 62. The plunger 64 is urged toward the tip end (the direction of arrow B) by the elastic force of a second spring 70.

[0047] A plurality of slide grooves 78 are formed on the outer peripheral surface of the rod main body 72. The plurality of slide grooves 78 are recessed radially inward relative to the outer peripheral surface of the rod main body 72. The guide ribs 34 of the sleeve body 22 are inserted into each slide groove 78. When the plunger 64 is housed inside the sleeve body 22, a portion of each guide rib 34 is inserted into each slide groove 78.

[0048] 4, the rod body 72 has a rod hole 80 formed therein. The rod hole 80 extends along the axial direction (the direction of arrows A and B) of the rod body 72. The shaft portion 242 of the intermediate cap 24, the second spring 70, and the pin body 462 of the second lock pin 44 are inserted into the rod hole 80.

[0049] The second elastic portion 76 has elasticity that allows it to elastically deform radially inward and elastically recover radially outward. Before use of the medicinal solution administration device 10, the pin body 462 of the second lock pin 44 is inserted into the second elastic portion 76. A second inner wall 76A of the second elastic portion 76 contacts the second lock pin 44 (the outer peripheral surface of the pin body 462). The second elastic portion 76 has a plurality of flexible portions 76B and a plurality of flange portions 76C. Hereinafter, the flexible portions 76B will be referred to as "second flexible portions 76B" and the flange portions 76C will be referred to as "second flange portions 76C."

[0050] The multiple second flexible portions 76B are formed at the base end of the rod main body 72 and are divided in the circumferential direction. Each of the multiple second flexible portions 76B extends along the axial direction of the plunger 64. The multiple second flexible portions 76B are formed to have the same shape. The multiple second flexible portions 76B are provided at equal intervals in the circumferential direction around the central axis of the plunger 64. Below, a case where four second flexible portions 76B and four second flange portions 76C are provided will be described.

[0051] The second flexible portions 76B protrude in the axial direction (direction of arrow A) from the base end of the rod main body 72 and are arranged so as to be spaced apart from each other in the circumferential direction. The second flexible portions 76B expand radially outward in diameter toward the base end relative to the rod main body 72. The base end portions (free ends) of the second flexible portions 76B are displaceable radially inward, with the tip end portions (fixed ends) of the second flexible portions 76B connected to the rod main body 72 serving as a fulcrum. In other words, each of the multiple second flexible portions 76B is elastically deformable radially inward.

[0052] The pin body 462 of the second lock pin 44 is inserted into the second flexible portion 76B. The inner diameter of the second flexible portion 76B is larger than the inner diameter of the rod hole 80. By inserting the pin body 462 into the second flexible portion 76B, elastic deformation of the second flexible portion 76B in the radially inward direction is prevented. Before use of the medicinal solution administration device 10, by inserting the pin body 462 of the second lock pin 44 into the second elastic portion 76, the second elastic portion 76 is prevented from elastically deforming in the radial direction, resulting in an elastic deformation prevented state.

[0053] A second engagement step 82 is provided at the boundary between the second flexible portion 76B and the rod body 72. The second engagement step 82 extends in a radial direction perpendicular to the axial direction of the rod body 72. When the pin body 462 of the second lock pin 44 is inserted into the rod hole 80, the tip of the pin body 462 engages with the second engagement step 82. This positions the rod body 72 in the axial direction relative to the second lock pin 44.

[0054] As shown in Figure 5, when the second lock pin 44 moves relative to the plunger 64 in the base end direction (direction of arrow A), the second lock pin 44 leaves the inside of the second elastic portion 76, and after the contact between the second inner wall 76A and the second elastic portion 76 is released, the elastic deformation prevention state of the second elastic portion 76 is released.

[0055] As shown in FIG. 3, the mounting portion 74 has a smaller diameter than the rod main body 72. The tip of the second spring 70 is engaged with the boundary between the mounting portion 74 and the rod main body 72. As a result, the resilient force of the second spring 70 urges the plunger 64 in a direction that moves it away from the intermediate cap 24, i.e., in the tip direction (direction of arrow B). A top member 86 is attached to the tip of the mounting portion 74. The top member 86 is cylindrical and protrudes from the tip of the plunger 64 in the tip direction.

[0056] The trigger member 14 is displaced relative to the housing 12 in the proximal direction (arrow A direction) by being pressed against the skin S (the target to be punctured) of the patient K. The trigger member 14 is movably disposed inside the main body 20 of the housing 12. The trigger member 14 is configured as a needle cover that covers the puncture needle 164, which will be described later. The trigger member 14 includes a cylindrical trigger body 141, a pair of cover portions 142 extending from the trigger body 141 in the proximal direction (arrow A direction), and a pair of connecting arms 143 extending from the proximal ends of the cover portions 142. The resilient force of the sleeve spring 40 is applied to the trigger member 14 in the distal direction via the slide member 56. Before use of the medicinal solution administration device 10, the distal end of the trigger member 14 protrudes distally (arrow B direction) beyond the distal end of the housing 12.

[0057] The trigger body 141 is formed at the tip end (in the direction of arrow B) of the trigger member 14. The trigger body 141 includes a hole 14a and a pair of engagement holes 88. The hole 14a is formed at the center of the tip end of the trigger body 141 and opens through in the axial direction. The pair of engagement holes 88 are formed on the outer surface of the trigger body 141. Each of the pair of engagement holes 88 penetrates the trigger body 141 in the radial direction.

[0058] The pair of cover portions 142 are disposed symmetrically about the axis of the trigger member 14, and each extends along the axial direction. Each of the pair of cover portions 142 has a syringe guide hole 90. The syringe guide hole 90 penetrates the cover portion 142 in the radial direction and extends in the axial direction. The syringe guide hole 90 is provided further toward the base end than the engagement hole 88. The syringe guide hole 90 and the engagement hole 88 are disposed linearly along the axial direction of the trigger member 14. The connecting arm 143 extends further toward the base end from the base end of the cover portion 142. The base end of the connecting arm 143 is connected to the tip of the tubular portion 562 of the slide member 56.

[0059] The syringe 16 includes a hollow cylindrical body 161 , a stopper 163 , a puncture needle 164 , and a protective cover 165 .

[0060] The cylindrical body 161 is made of a transparent resin material. The cylindrical body 161 is a hollow body formed in a substantially cylindrical shape with an open base end. The cylindrical body 161 has a chamber 162 filled with a medicinal liquid M inside. The cylindrical body 161 has a flange 92 that protrudes radially outward on the outer periphery of the base end. The cylindrical body 161 has a needle holding portion 94 at its tip. The needle holding portion 94 has a reduced diameter from the cylindrical body 161 and protrudes toward the tip. The needle holding portion 94 holds the base end of the puncture needle 164. The medicinal liquid M may be, for example, one used for subcutaneous injection into a user.

[0061] The stopper 163 is slidably inserted into the interior of the cylindrical body 161. The stopper 163 is formed from an elastic material such as rubber. The stopper 163 is attached to the tip portion of the top member 86. The stopper 163 protrudes in the tip direction relative to the top member 86. The stopper 163 is inserted into the chamber 162 of the cylindrical body 161 through the base end opening of the cylindrical body 161. The stopper 163 is housed along the chamber 162 of the cylindrical body 161 so as to be slidable in the axial direction. By inserting the stopper 163 into the interior of the cylindrical body 161, the base end side of the cylindrical body 161 is sealed liquid-tight, and the medicinal liquid M in the chamber 162 is enclosed inside the cylindrical body 161.

[0062] The puncture needle 164 is provided in the needle holding portion 94 of the cylindrical body 161 and protrudes from the needle holding portion 94 toward the tip (in the direction of arrow B). The puncture needle 164 is a hollow body having an internal flow path through which the medicinal liquid M flows. The flow path of the puncture needle 164 communicates with the interior of the cylindrical body 161 which is filled with the medicinal liquid M. When the plunger 64 moves toward the tip, the stopper 163 causes the medicinal liquid M in the chamber 162 to be ejected from the tip of the puncture needle 164 and administered to the patient K (see FIG. 14 ).

[0063] The protective cover 165 is attached to the tip of the cylindrical body 161 and covers the puncture needle 164. The protective cover 165 is attached to the needle holding portion 94 so as to cover the puncture needle 164.

[0064] The syringe holder 96 is formed in a cylindrical shape and is provided on the outer periphery of the syringe 16. The syringe holder 96 holds the cylindrical body 161 of the syringe 16.

[0065] Syringe holder 96 includes a holder main body 961 and a pair of guide portions 962 that protrude radially outward from the outer circumferential surface of holder main body 961. Holder main body 961 is formed in a cylindrical shape and is held on the inner circumferential surface of housing 12. A cylindrical body 161 of syringe 16 is housed inside holder main body 961. A flange 92 of syringe 16 is engaged with the base end of syringe holder 96.

[0066] The guide portion 962 is inserted into the syringe guide hole 90 of the trigger member 14. The syringe holder 96 is held together with the syringe 16 inside the trigger member 14 so as to be movable along the axial direction (direction of arrows A and B).

[0067] When the syringe 16 is held by the syringe holder 96 and housed inside the trigger member 14, the puncture needle 164 is positioned in the tip direction (direction of arrow B), and the cylindrical body 161 faces the window portion 26 of the housing 12 (see Figure 1).

[0068] The cap 18 is formed in a cylindrical shape with a bottom, and has a bottom wall 981 and an annular peripheral wall 982. The bottom wall 981 is formed at the tip of the cap 18. The peripheral wall 982 extends from the bottom wall 981 toward the base end (direction of arrow A). The base end of the cap 18 is open. The cap 18 further has a pair of holding arms 100. The pair of holding arms 100 protrude in the axial direction (direction of arrow A) from the base end of the peripheral wall 982. The holding arms 100 are disposed radially inward with respect to the peripheral wall 982, and can tilt radially outward with the connection point with the peripheral wall 982 as a fulcrum. The base end of the holding arm 100 is provided with a hook 102 protruding radially inward.

[0069] When the cap 18 is attached to the tip of the main body 20 of the drug solution administration device 10 before use, the hooks 102 of the pair of holding arms 100 are inserted into a pair of recesses 104 formed in the inner circumferential surface of the housing 12, respectively. The recesses 104 are recessed radially outward from the inner circumferential surface of the main body 20. With the cap 18 positioned axially relative to the housing 12, the cap 18 is fixed to the tip of the housing 12. In this way, the cap 18 is attached so as to cover the trigger member 14 and the tip of the housing 12.

[0070] As shown in Fig. 4, a start signal generating unit 110 is further provided inside the distal end housing 12A. The start signal generating unit 110 generates a start signal that notifies the patient K of the start time of subcutaneous administration of the medicinal solution M as the plunger 64 moves distally. The start signal generating unit 110 is composed of a second elastic portion 76 provided on the plunger 64, and a reduced diameter portion 114 and a collision receiving portion 116 provided on the housing 12. Hereinafter, the reduced diameter portion will be referred to as the "second reduced diameter portion 114," and the collision receiving portion 116 will be referred to as the "second collision receiving portion 116."

[0071] A plurality of second reduced diameter portions 114 are provided on the inner circumferential surface of the sleeve body 22 and are provided radially outward of the plunger 64. The plurality of second reduced diameter portions 114 are provided at the boundary between the enlarged diameter portion 32 of the sleeve body 22 and the main body 30. As shown in FIG. 6 , the plurality of second reduced diameter portions 114 protrude radially inward from the inner circumferential surface of the sleeve body 22. The number of second reduced diameter portions 114 is the same as the number of second flexible portions 76B of the plunger 64 (four in this embodiment). The second reduced diameter portions 114 and the second flexible portions 76B (second flange portions 76C) are arranged at the same positions in the circumferential direction of the sleeve body 22. Each of the plurality of second flange portions 76C and each of the plurality of second reduced diameter portions 114 are arranged linearly. It is preferable that the number of second reduced diameter portions 114 is an even number.

[0072] The second reduced diameter portion 114 has a second surface 118 disposed radially inward. The second surface 118 is substantially parallel to the axial direction of the sleeve body 22. The diameter of the second surface 118 is smaller than the outer diameter of the second flange portion 76C of the plunger 64.

[0073] Before use of the medicinal solution administration device 10, the second flange 76C of the plunger 64 abuts against and engages with the base end side (direction of arrow A) of the second reduced diameter portion 114. As shown in FIG. 6 , as the plunger 64 moves toward the distal end of the housing 12, the outer surface of the second flange 76C of the plunger 64 can come into contact with the second surface 118 of the second reduced diameter portion 114. The second reduced diameter portion 114 presses each of the multiple second flanges 76C radially inward. As each second flange 76C is pressed, each second flexible portion 76B elastically deforms radially inward.

[0074] As shown in FIG. 4, the second collision receiving portion 116 is provided on the inner circumferential surface of the main body 30 of the sleeve body 22. The second collision receiving portion 116 is disposed in the distal direction of the second reduced diameter portion 114 (in the direction of arrow B) and is adjacent to the second reduced diameter portion 114. The second collision receiving portion 116 is disposed radially outward of the second surface 118 of the second reduced diameter portion 114. As shown in FIG. 7, the second collision receiving portion 116 can collide with the second elastic portion 76 when the plunger 64 moves in the distal direction. The second collision receiving portion 116 and the second reduced diameter portion 114 are disposed linearly in the axial direction of the sleeve body 22. As shown in FIG. 4, the diameter of the second collision receiving portion 116 is larger than the diameter of the second surface 118 of the second reduced diameter portion 114 and is equal to or smaller than the outer diameter of the second flange portion 76C.

[0075] After the plunger 64 moves distally and the second flange 76C passes through the second reduced diameter portion 114, the second flexible portion 76B and the second flange 76C can elastically return to their original shape radially outward. The outer peripheral surface of each elastically returned second flange 76C collides radially with the second collision target 116. A start signal is generated by the collision between each second flange 76C and the second collision target 116. The start signal is a collision sound generated when the second flange 76C of the plunger 64 collides with the second collision target 116. Note that the start signal is not limited to a collision sound. For example, the start signal may be a vibration generated when the second flange 76C of the plunger 64 collides with the second collision target 116. The start signal may be both a collision sound and a vibration. The start signal is a signal for recognizing the administration start time when, in a state in which the puncture needle 164 of the drug solution administration device 10 has been inserted, the plunger 64 starts to move toward the distal end, and the movement of the plunger 64 presses the stopper 163, thereby starting to administer the drug solution M in the syringe 16. The administration start time is either before the drug solution M is administered (before the drug solution M starts to flow through the puncture needle 164), simultaneously with the start of administration of the drug solution M (simultaneous with the start of administration of the drug solution M through the puncture needle 164), or after administration of the drug solution M has started (after the drug solution M starts to flow through the puncture needle 164). That is, the start signal generating unit 110 generates the start signal when the second flange portion 76C of the second elastic portion 76 collides with the second collision portion 116. Note that the start signal generating unit 110 is not limited to being provided in the distal end side housing 12A and generating the start signal in response to the movement of the plunger 64. For example, the start signal generating section 110 may be provided in the proximal housing 12B, and the start signal may be generated by the movement of the indicator member 150.

[0076] As shown in FIG. 2, the base-end housing 12B is provided with a completion signal generating unit 15 that generates a completion signal to notify the patient K that the administration of the medicinal liquid M has been completed after the administration of the medicinal liquid M into the patient's skin has been completed.

[0077] As shown in FIG. 8, the distal end and proximal end of the proximal housing 12B are open. The distal end of the proximal housing 12B is connected to the proximal end of the distal housing 12A. The distal end of the proximal housing 12B is closed by a lid portion 241 of the intermediate cap 24. An end cap 120 is provided at the proximal end of the proximal housing 12B. The end cap 120 has a lid portion 1201 and a shaft portion 1202 extending from the lid portion 1201 in the distal direction (direction of arrow B). The lid portion 1201 is formed in a disk shape and closes the proximal end of the proximal housing 12B. The shaft portion 1202 is housed inside the proximal housing 12B.

[0078] Inside the base-end housing 12B, there are provided a sleeve member 122 and a lock pin 124. Hereinafter, the lock pin 124 will be referred to as a "first lock pin 124."

[0079] The sleeve member 122 is formed in a cylindrical shape. The sleeve member 122 includes a sleeve main body 126 and a sleeve base end portion 128 provided on the base end side of the sleeve main body 126. The sleeve base end portion 128 is cylindrical and has a larger diameter than the sleeve main body 126. The sleeve base end portion 128 is fixed to the base end housing 12B by engaging with the inner periphery of the base end housing 12B.

[0080] The first lock pin 124 is provided inside the base-end housing 12B and the sleeve member 122 so as to be relatively movable in the axial direction. The first lock pin 124 moves in the base-end direction (direction of arrow A) due to the relative movement of the trigger member 14 (see FIG. 3) in the base-end direction. Before use of the medical solution administration device 10, the first lock pin 124 is arranged so as to straddle the sleeve base end 128 and the sleeve main body 126 in the axial direction of the sleeve member 122. The first lock pin 124 has a cylindrical pin main body 461 and a pair of arm portions 471 (see FIG. 2) provided radially outward of the pin main body 461.

[0081] The pin body 461 is provided at the center of the first lock pin 124. The pin body 461 has a hole 491. The hole 491 is formed inside the pin body 461. The hole 491 extends along the axial direction of the pin body 461. The base end of the pin body 461 is provided with an end wall 501. The end wall 501 is perpendicular to the axial direction of the pin body 461. The end wall 501 extends radially outward from the pin body 461. The hole 491 of the pin body 461 penetrates the end wall 501.

[0082] As shown in FIG. 2, the pair of arm portions 471 are provided at the base end of the pin body 461. The pair of arm portions 471 are connected to the outer edge of the end wall portion 501. The pair of arm portions 471 extend from the end wall portion 501 toward the tip. The pair of arm portions 471 are arranged parallel to the pin body 461 and spaced apart radially outward from the pin body 461. The first lock pin 124 is supported movably along the axial direction of the sleeve member 122.

[0083] The distal ends of the pair of arm portions 471 are provided with abutment portions 125, and each of the pair of arm portions 471 and each of the pair of extending portions 48 are arranged in a straight line. When the trigger member 14 moves relatively toward the proximal end, the abutment portions 125 come into contact with the extending portions 48 of the second lock pin 44 (see FIG. 15 ). When the second lock pin 44 moves in the proximal end direction due to the relative movement of the trigger member 14 in the proximal end direction with respect to the housing 12, the extending portions 48 of the second lock pin 44 come into contact with the abutment portions 125 of the arm portions 471 of the first lock pin 124, and the extending portions 48 push the first lock pin 124 in the proximal end direction. The first lock pin 124 moves in the proximal end direction together with the second lock pin 44.

[0084] The completion signal generating unit 15 is provided inside the base-end housing 12B. The completion signal generating unit 15 is composed of an indicator member 150, a guide member 152, a reduced diameter portion 154, a collision-receiving portion 156, and a delay structure 158. Hereinafter, the reduced diameter portion 154 will be referred to as the "first reduced diameter portion 154," and the collision-receiving portion 156 will be referred to as the "first collision-receiving portion 156."

[0085] The indicator member 150 is movable in the distal direction relative to the base-end housing 12B in accordance with the relative movement of the trigger member 14 in the proximal direction. The indicator member 150 is formed in a cylindrical shape from a resin material. The indicator member 150 is formed to be elongated in the axial direction (direction of arrows A and B). The indicator member 150 is accommodated inside the housing 12 (base-end housing 12B) and the sleeve member 122 so as to be movable in the axial direction.

[0086] The indicator member 150 includes a cylindrical indicator body 170, a collision portion 172 formed at the tip of the indicator body 170, and an elastic portion 174 that is elastically deformable in the radial direction. Hereinafter, the elastic portion 174 will be referred to as the "first elastic portion 174." The indicator member 150 and the sleeve member 122 are arranged coaxially.

[0087] As shown in Fig. 9, a plurality of slide grooves 176 are formed on the outer peripheral surface of the indicator body 170. The plurality of slide grooves 176 are recessed radially inward relative to the outer peripheral surface of the indicator body 170. As shown in Fig. 2, a plurality of guide ribs 130 of the sleeve member 122 are inserted into each slide groove 176. The indicator member 150 is guided in the axial direction of the sleeve member 122 by the guide ribs 130.

[0088] As shown in Fig. 8, the indicator body 170 has an indicator hole 178 inside. The indicator hole 178 extends along the axial direction of the indicator body 170 (the direction of arrows A and B). The shaft portion 1202 of the end cap 120, the indicator spring 180, and a portion of the first lock pin 124 are inserted into the indicator hole 178. Hereinafter, the indicator spring 180 will be referred to as the "first spring 180."

[0089] The indicator body 170 has a cylindrical intermediate portion 182 at its base end. The intermediate portion 182 has a larger diameter than the indicator body 170. An annular protrusion 184 is provided between the indicator body 170 and the intermediate portion 182. The protrusion 184 extends radially outward from the outer circumferential surface of the indicator body 170. The protrusion 184 is substantially perpendicular to the axial direction of the indicator body 170.

[0090] The collision portion 172 is annular when viewed from the axial direction of the indicator member 150 (see FIG. 9). The collision portion 172 is provided on the tip surface of the indicator main body 170. The collision portion 172 is a surface that is perpendicular to the axial direction of the indicator main body 170. The collision portion 172 faces the lid portion 241 of the intermediate cap 24. Note that the collision portion 172 is not limited to being formed in an annular shape. For example, the collision portion 172 may be provided so that a portion of the tip surface of the indicator main body 170 protrudes.

[0091] The first elastic portion 174 has elasticity that allows it to be elastically deformed radially inward and elastically restore its shape radially outward. Before use of the medical solution administration device 10, the pin body 461 of the first lock pin 124 is inserted into the first elastic portion 174. A first inner wall 174A of the first elastic portion 174 contacts the first lock pin 124 (the outer peripheral surface of the pin body 461). The first elastic portion 174 is provided at the base end of the intermediate portion 182. The first elastic portion 174 includes a plurality of first flexible portions 174B and a plurality of first flange portions 174C.

[0092] The multiple first flexible portions 174B are formed at the base end of the indicator body 170 and are divided in the circumferential direction. Each of the multiple first flexible portions 174B extends along the axial direction of the indicator body 170. The multiple first flexible portions 174B are formed to have the same shape. The multiple first flexible portions 174B are arc-shaped and spaced apart equally in the circumferential direction around the central axis of the indicator member 150 (see FIG. 9). Below, a case where four first flexible portions 174B and four first flange portions 174C are provided will be described.

[0093] The first flexible portions 174B protrude in the axial direction (the direction of arrow A) from the base end of the indicator main body 170 and are arranged to be spaced apart from each other in the circumferential direction. The first flexible portions 174B expand radially outward in diameter toward the base end relative to the indicator main body 170. The first flexible portions 174B are arranged between two adjacent slide grooves 176 (see FIG. 9). The base ends (free ends) of the first flexible portions 174B are displaceable radially inward with the tip ends (fixed ends) of the first flexible portions 174B connected to the indicator main body 170 as a fulcrum. In other words, each of the multiple first flexible portions 174B is elastically deformable radially inward.

[0094] The pin body 461 of the first lock pin 124 is inserted into the first flexible portion 174B. The inner diameter of the first flexible portion 174B is larger than the inner diameter of the indicator hole 178. By inserting the pin body 461 into the first flexible portion 174B, elastic deformation of the first flexible portion 174B in the radially inward direction is prevented. Before use of the medicinal solution administration device 10, by inserting the pin body 461 of the first lock pin 124 into the first elastic portion 174, the first elastic portion 174 is prevented from elastically deforming in the radial direction, thereby entering an elastic deformation prevented state.

[0095] A first engagement step 174D is provided at the boundary between the first flexible portion 174B and the indicator body 170. The first engagement step 174D extends in a radial direction perpendicular to the axial direction of the indicator member 150. When the pin body 461 of the first lock pin 124 is inserted into the indicator hole 178, the tip of the pin body 461 engages with the first engagement step 174D. This positions the indicator member 150 in the axial direction relative to the first lock pin 124.

[0096] As shown in FIG. 10, when the first lock pin 124 moves relative to the indicator member 150 in the base end direction (direction of arrow A), the first lock pin 124 disengages from the inside of the first elastic portion 174, and after the contact between the first inner wall 174A and the first elastic portion 174 is released, the elastic deformation prevention state of the first elastic portion 174 is released.

[0097] 8, the first flange portion 174C is provided at the base end of the first flexible portion 174B and protrudes radially outward from the first flexible portion 174B. The first flange portion 174C is provided on each of the multiple first flexible portions 174B. That is, there are the same number of first flange portions 174C and first flexible portions 174B (four in this embodiment).

[0098] The tip of the first spring 180 is engaged with the boundary between the indicator body 170 and the first elastic part 174. The resilient force of the first spring 180 urges the indicator member 150 towards the tip (direction of arrow B).

[0099] The guide member 152 is formed in a hollow cylindrical shape and is fixed inside the base-end housing 12B. A part of the indicator member 150 is housed inside the guide member 152. The guide member 152 supports the indicator member 150 so that it can move in the axial direction. The guide member 152 includes a first cylindrical portion 152A and a second cylindrical portion 152B provided on the tip side (direction of arrow B) of the first cylindrical portion 152A. The first cylindrical portion 152A is housed inside the sleeve member 122 and fixed to the sleeve member 122. The second cylindrical portion 152B has a smaller diameter than the first cylindrical portion 152A. The diameter of the inner peripheral surface of the second cylindrical portion 152B is smaller than the diameter of the inner peripheral surface of the first cylindrical portion 152A. The tip of the second cylindrical portion 152B faces the lid portion 241 of the intermediate cap 24.

[0100] A plurality of first reduced diameter portions 154 are provided on the inner circumferential surface of the sleeve member 122 and are provided radially outward of the indicator member 150. The first reduced diameter portions 154 protrude radially inward from the inner circumferential surface of the sleeve member 122 toward the indicator member 150. The number of first reduced diameter portions 154 is the same as the number of first flexible portions 174B of the indicator member 150 (four in this embodiment). The first reduced diameter portions 154 and the first flexible portions 174B are disposed at the same positions in the circumferential direction of the sleeve member 122. When viewed in the axial direction of the sleeve member 122, each first reduced diameter portion 154 has an arc shape, and each of the multiple first flange portions 174C and each of the multiple first reduced diameter portions 154 are disposed linearly. Note that the first reduced diameter portion 154 may be annular.

[0101] The first reduced diameter portion 154 has a first surface 159 disposed radially inward. The first surface 159 is substantially parallel to the axial direction of the sleeve member 122. The diameter of the first surface 159 is smaller than the outer diameter of the first flange portion 174C of the indicator member 150.

[0102] Before use of the medical solution administration device 10, the first flange 174C of the indicator member 150 abuts against and engages with the base end side (direction of arrow A) of the first reduced diameter portion 154. As the indicator member 150 moves toward the tip end of the base-end housing 12B as shown in FIG. 10, the outer surface of the first flange 174C can come into contact with the first surface 159 of the first reduced diameter portion 154 as shown in FIG. 11. The first reduced diameter portion 154 presses each of the multiple first flanges 174C radially inward. As each first flange 174C is pressed, each first flexible portion 174B elastically deforms radially inward.

[0103] After indicator member 150 moves distally and first flange 174C passes first reduced diameter portion 154, the axial engagement between first flange 174C and first reduced diameter portion 154 is released.

[0104] As shown in FIG. 8, the first collision receiving portion 156 is provided on the lid portion 241 of the intermediate cap 24. The first collision receiving portion 156 is disposed so as to face the tip end portion (collision portion 172) of the indicator member 150 in the axial direction. The first collision receiving portion 156 is cylindrical and protrudes from the lid portion 241 in the base end direction (direction of arrow A). When viewed from the axial direction of the indicator member 150, the diameter of the first collision receiving portion 156 and the diameter of the collision portion 172 of the indicator member 150 are substantially the same. Note that the first collision receiving portion 156 is not limited to protruding in the base end direction from the lid portion 241. For example, the first collision receiving portion 156 may be an end surface of the lid portion 241 of the intermediate cap 24 in the base end direction.

[0105] Before use, the medical solution administration device 10 has a state in which the impact portion 172 and the first impacted portion 156 of the indicator member 150 are spaced apart in the axial direction. As shown in FIG. 13 , when the indicator member 150 moves toward the distal end, the impact portion 172 and the first impacted portion 156 collide. A completion signal is generated by the collision between the impact portion 172 and the first impacted portion 156. The completion signal is a collision sound generated when the impact portion 172 and the first impacted portion 156 of the indicator member 150 collide. Note that the completion signal is not limited to a collision sound. For example, the completion signal may be a vibration generated when the impact portion 172 and the first impacted portion 156 of the indicator member 150 collide.

[0106] 8, delay structure 158 controls the speed at which indicator member 150 moves toward the tip (in the direction of arrow B) due to the elastic force of first spring 180 to a first speed. Delay structure 158 is provided between indicator member 150 and guide member 152. Delay structure 158 has a delay member 186 that causes indicator member 150 to slide relative to guide member 152.

[0107] The delay member 186 is provided on the outer periphery of the tip of the indicator member 150. The delay member 186 is formed in an annular shape and is attached and fixed in an annular groove 188 of the indicator body 170. The delay member 186 protrudes radially from the outer periphery of the indicator body 170. That is, the outer diameter of the delay member 186 is larger than the outer diameter of the indicator body 170. The outer periphery of the delay member 186 is slidable on the second tubular portion 152B of the guide member 152. Note that the delay member 186 is not limited to being formed in an annular shape. For example, the delay member 186 may be provided on a portion of the outer periphery of the indicator member 150. The coefficient of friction between the delay member 186 and the guide member 152 is greater than the coefficient of friction between the indicator member 150 and the guide member 152 when they come into contact with each other. The delay member 186 is made of an elastic material such as rubber. Note that the material of the delay member 186 is not limited to an elastic material.

[0108] Before the indicator member 150 moves distally relative to the base-end housing 12B, the delay member 186 is disposed inside the second tubular portion 152B and abuts against the inner circumferential surface of the second tubular portion 152B. When the indicator member 150 moves distally, the delay member 186 slides on the inner circumferential surface of the second tubular portion 152B after the indicator member 150 starts to move distally, causing the indicator member 150 to move distally at a first speed. That is, the speed at which the indicator member 150 moves distally is controlled to the first speed due to the relationship between the elastic force of the first spring 180 acting in the distal direction of the indicator member 150 and the sliding resistance (frictional force) between the delay member 186 and the guide member 152.

[0109] As the indicator member 150 moves distally, as shown in FIG. 12 , the delay member 186 moves away from the distal end of the second cylindrical portion 152B in the distal direction, thereby releasing the sliding movement between the delay member 186 and the second cylindrical portion 152B of the guide member 152. In other words, when the moving distance of the indicator member 150 from when it starts moving distally reaches a predetermined distance, the delay member 186 moves away from the second cylindrical portion 152B in the distal direction. The distance that the delay member 186 moves from the second cylindrical portion 152B in the distal direction to when it moves away from the second cylindrical portion 152B is the distance that the delay member 186 moves along the axial direction of the second cylindrical portion 152B. From when the indicator member 150 starts moving until the delay member 186 moves away from the guide member 152, the indicator member 150 moves at a first speed. The time during which the indicator member 150 moves at the first speed is the time during which the delay member 186 moves while sliding against the inner surface of the second cylindrical portion 152B, and is, for example, the time from the start of administration of the medicinal liquid M to the completion of administration of the medicinal liquid M.

[0110] When the delay member 186 moves away from the second cylindrical portion 152B of the guide member 152 in the distal direction, the sliding between the delay member 186 and the second cylindrical portion 152B is released, and the indicator member 150 moves in the distal direction at a second speed that is faster than the first speed. While the indicator member 150 is moving in the distal direction at the second speed, the colliding portion 172 collides with the first collided portion 156, generating a completion signal.

[0111] It should be noted that the delay member 186 is not limited to being provided on the outer periphery of the indicator member 150. For example, the delay member 186 may be provided on the inner periphery of the guide member 152 so as to be slidable on the outer periphery of the indicator member 150. That is, the delay member 186 may be provided on either the indicator member 150 or the guide member 152. The delay structure 158 is not limited to a configuration having the delay member 186 disposed between the outer periphery of the indicator member 150 and the inner periphery of the guide member 152. For example, another embodiment of the delay structure 158 may have a damper mechanism (e.g., an oil damper mechanism) that delays operation by utilizing fluid resistance.

[0112] Next, administration of the medicinal liquid M by the medicinal liquid administration device 10 will be described.

[0113] First, in the drug solution administration device 10 before use shown in Figure 2, the cap 18 is removed from the housing 12 and the tip of the trigger member 14. At this time, the user grips the main body 20 of the housing 12 and pulls the cap 18 in a direction (arrow B direction) that moves the cap 18 away from the housing 12. This causes the cap 18 to move away from the tip of the trigger member 14, and the holding arm 100 tilts, causing the hook 102 to disengage from the engagement hole 88. The protective cover 165 moves toward the tip together with the cap 18, thereby opening the tips of the housing 12 and the trigger member 14, and simultaneously removing the protective cover 165 that had been covering the puncture needle 164 (see Figure 15).

[0114] Next, the liquid medicine M is administered using the liquid medicine administration device 10 from which the cap 18 has been removed.

[0115] As shown in FIG. 14, in the state before puncturing of the medicinal solution administration device 10, the pin body 462 of the second lock pin 44 is inserted inside the second flexible portion 76B of the plunger 64 (see FIG. 4). The second lock pin 44 prevents the second flexible portion 76B from tilting radially inward (elastic deformation). That is, the second lock pin 44 prevents the second elastic portion 76 from elastically deforming radially inward. That is, the second flexible portion 76B cannot elastically deform radially inward. The second flange portion 76C of the second flexible portion 76B is engaged with the second reduced diameter portion 114 of the sleeve body 22, so the plunger 64 cannot move distally.

[0116] The user grasps housing 12 and presses the tip of trigger member 14, which protrudes from the tip of housing 12, against the skin S of patient K, which will be the desired puncture site, at approximately a right angle. Next, housing 12 is continuously pressed further toward the skin S (toward the tip, in the direction of arrow B). As housing 12 is pressed toward skin S, trigger member 14 is pressed by skin S and moves relative to housing 12 in the proximal direction (in the direction of arrow A) against the elastic force of sleeve spring 40.

[0117] 15, as the housing 12 is further pressed toward the skin S, the puncture needle 164 of the syringe 16 protrudes from the hole 14a of the trigger member 14 toward the tip (in the direction of arrow B). This causes the puncture needle 164 to puncture the skin S and enter a puncture-completed state in which it has been inserted to a predetermined depth. In the puncture-completed state, the tip of the main body 20 is at approximately the same position as the tip of the trigger member 14 in the axial direction of the medicinal solution administration device 10.

[0118] The trigger rib 144 (see FIG. 3 ) of the trigger member 14 abuts against the tip of the slide member 56. Therefore, when the trigger member 14 moves in the proximal direction relative to the housing 12 as described above, the slide member 56 also moves in the proximal direction relative to the housing 12. As the slide member 56 moves in the proximal direction, the tip of the slit hole 58 of the slide member 56 presses the engagement end 52 provided at the tip of the arm portion 472 of the second lock pin 44 in the proximal direction, so that the second lock pin 44 also moves in the proximal direction relative to the housing 12.

[0119] As second lock pin 44 moves relatively in the proximal direction, arm portion 472 of second lock pin 44 is pushed in the proximal direction by the pair of connecting arms 143. As second lock pin 44 moves, the base end of arm portion 472 abuts against abutment portion 125 and pushes arm portion 471 of first lock pin 124 in the proximal direction. As a result, first lock pin 124 moves in the proximal direction together with second lock pin 44.

[0120] 10, as the first lock pin 124 and the second lock pin 44 move relative to the housing 12 toward the proximal end (direction of arrow A), the pin body 461 of the first lock pin 124 moves away from the inside of the first flexible portions 174B of the indicator member 150 toward the proximal end (direction of arrow A). This releases the locked state of the indicator member 150 by the first lock pin 124, and the four first flexible portions 174B of the indicator member 150 become tiltable (elastically deformable) radially inward. The indicator member 150 starts to move toward the distal end (direction of arrow B) due to the elastic force of the first spring 180.

[0121] After the first lock pin 124 is released from the interior of the indicator member 150, as shown in FIG. 5, the pin body 462 of the second lock pin 44 is released from the inside of the second flexible portions 76B of the plunger 64 toward the proximal end (direction of arrow A). This releases the plunger 64 from its locked state by the second lock pin 44, allowing the four second flexible portions 76B of the plunger 64 to tilt radially inward (to be elastically deformable). The plunger 64 begins to move toward the distal end (direction of arrow B) due to the elastic force of the second spring 70. That is, after the indicator member 150 is released from its elastically deformable state by the first lock pin 124, the plunger 64 is released from its elastically deformable state by the second lock pin 44. In other words, the first elastic portion 174 is released from its elastically deformable state before the second elastic portion 76 is released from its elastically deformable state.

[0122] When the indicator member 150 begins to move distally (in the direction of arrow B) due to the resilient force of the first spring 180, the four first flanges 174C are pushed radially inward by contact with the first reduced diameter portions 154, as shown in FIG. 11 . The first flanges 174C begin to elastically deform radially inward from the base ends of the first reduced diameter portions 154 so as to overcome the first reduced diameter portions 154, and the first flexible portions 174B begin to tilt radially inward. As the indicator member 150 continues to move distally, the outer surfaces of the first flanges 174C come into contact with the first surfaces 159 of the first reduced diameter portions 154, causing the indicator member 150 to move distally while elastically deforming radially inward. At this time, each of the four first flanges 174C simultaneously comes into contact with the first surfaces 159 of the four first reduced diameter portions 154.

[0123] After the indicator member 150 further moves distally and the four first flanges 174C overcome the first reduced diameter portions 154, the indicator member 150 moves distally in a state in which it is again expanded radially outward by the elastic restoring force of the first flexible portions 174B. At this time, the indicator member 150 moves distally at a first speed while the delay member 186 slides on the inner circumferential surface of the second cylindrical portion 152B of the guide member 152. The delay member 186 controls the moving speed of the indicator member 150 to the first speed. The first speed is slower than the moving speed of the indicator member 150 that moves due to the elastic force of the first spring 180 when the indicator member 150 does not include the delay structure 158.

[0124] While the indicator member 150 moves distally along the guide member 152 at a first speed, the plunger 64 moves distally (in the direction of arrow B) due to the resilient force of the second spring 70. As the plunger 64 moves distally, the four second flanges 76C come into contact with the second reduced diameter portions 114 and are pushed radially inward. The second flanges 76C begin to elastically deform radially inward from the proximal ends of the second reduced diameter portions 114 so as to overcome the second reduced diameter portions 114, and the second flexible portions 76B begin to tilt radially inward. As the plunger 64 moves further distally, as shown in FIG. 6 , the outer surfaces of the second flanges 76C come into contact with the second surfaces 118 of the second reduced diameter portions 114, causing the plunger 64 to move distally while elastically deforming radially inward. At this time, the four second flange portions 76C come into contact with the second surfaces 118 of the four second reduced diameter portions 114, respectively, simultaneously.

[0125] After the plunger 64 further moves distally and the four second flanges 76C overcome the second reduced diameter portion 114, as shown in FIG. 7, the second flexible portion 76B expands radially outward again due to the elastic restoring force thereof, and the outer surfaces of the second flanges 76C collide with the second collision target 116. At this time, because the outer diameter of the second flanges 76C is smaller than the diameter of the second reduced diameter portion 114 and larger than the diameter of the second collision target 116, a start signal, which is a collision sound (smacking sound), is generated when the second flanges 76C collide with the second collision target 116. At this time, because the plunger 64 and the sleeve body 22 are arranged at the same time, each of the four second flanges 76C collides with the second collision target 116 at approximately the same time, generating a collision sound. In other words, the collision sound (start signal) generated at the second collision target 116 by the four second flanges 76C is generated once.

[0126] After the plunger 64 starts moving toward the distal end and the second flange 76C clears the second reduced diameter portion 114, the plunger 64 continues to move toward the distal end, causing the plunger 64 to begin pushing the stopper 163. The medicinal liquid M in the cylindrical body 161 is pressed toward the distal end by the stopper 163. This causes the medicinal liquid M to be expelled from the puncture needle 164, commencing administration of the medicinal liquid M subcutaneously to the patient K. As described above, when the plunger 64 starts moving toward the distal end and the second flange 76C clears the second reduced diameter portion 114, a start signal is generated as the second flange 76C collides with the main body 30. By checking the start signal, the patient K can confirm the administration start time, which is the time when administration of the medicinal liquid M has begun. In this case, the administration start time is a predetermined time after the start of administration of the medicinal liquid M. The administration start time may be before administration of the medicinal liquid M or simultaneously with the start of administration of the medicinal liquid M.

[0127] From the time when the plunger 64 starts to move toward the tip until the start signal is generated, in the completion signal generating unit 15, the delay member 186 slides along the inner surface of the second cylindrical portion 152B, while the indicator member 150 moves toward the tip along the guide member 152 at a first speed.

[0128] As the plunger 64 moves toward the distal end, it is guided by the guide ribs 34 of the sleeve body 22 inserted into the slide grooves 78. As a result, when the plunger 64 moves toward the distal end, it moves only in the axial direction without rotating. The stopper 163 attached to the top member 86 is inserted into the cylindrical body 161 of the syringe 16.

[0129] After the administration of medicinal liquid M has started, plunger 64 continues to move continuously toward the distal end (in the direction of arrow B) at a constant speed due to the elastic force of second spring 70. Medicinal liquid M is pushed out by stopper 163, which moves toward the distal end within cylindrical body 161, and as shown in Fig. 16, stopper 163 reaches the distal end of chamber 162, at which point plunger 64 administers a predetermined amount of medicinal liquid M from cylindrical body 161 through puncture needle 164 into skin S, thereby completing the administration of medicinal liquid M.

[0130] 12, as the indicator member 150 moves toward the distal end, the delay member 186 moves away from the distal end of the second cylindrical portion 152B in the distal direction. As the delay member 186 moves away from the guide member 152, the sliding movement between the delay member 186 and the second cylindrical portion 152B of the guide member 152 is released. As a result, the sliding movement between the delay member 186 and the guide member 152 is released, and the delay of the indicator member 150 by the delay structure 158 is released, and the indicator member 150 moves toward the distal end at a second speed that is faster than the first speed.

[0131] 13, the indicator member 150 moves toward the distal end at the second speed, and the collision part 172 collides with the first collision receiving part 156, generating a completion signal which is a collision sound (smacking sound). The completion signal is a signal for notifying the patient K that the administration of the medicinal liquid M has been completed after the administration of the medicinal liquid M into the subcutaneous tissue (inside the living body) of the patient K has been completed. By checking the completion signal, the patient K can confirm that the administration of the medicinal liquid M has been completed.

[0132] The timing of generating the completion signal is, for example, in the range of 5 to 10 seconds after the completion of administration of the medicinal liquid M. For example, by setting the timing of generating the completion signal to 5 seconds or later after the completion of administration of the medicinal liquid M, it is possible to allow the medicinal liquid M to penetrate subcutaneously into the patient K. For example, by setting the timing of generating the completion signal to within 10 seconds after the completion of administration of the medicinal liquid M, it is possible to reduce the waiting time that the patient K has to wait after the administration of the medicinal liquid M is completed.

[0133] After the patient K confirms the completion signal, the patient K moves the medicinal solution administration device 10 away from the skin S to be punctured. When the patient K releases the pressing force of the medicinal solution administration device 10 toward the skin S, the elastic force of the sleeve spring 40 urges the slide member 56 toward the tip. As the slide member 56 moves toward the tip, the trigger member 14 also moves toward the tip until the tip of the trigger member 14 is further distal than the puncture needle 164. As a result, the puncture needle 164 is completely covered by the trigger member 14.

[0134] The first embodiment has the following advantages.

[0135] 8, the medicinal solution administration device 10 includes a completion signal generating unit 15 that generates a completion signal to notify the patient K that administration of the medicinal solution M has been completed subcutaneously (inside the body) after the completion of administration of the medicinal solution M. The completion signal generating unit 15 has a delay structure 158 that controls the speed at which the indicator member 150, which is relatively movable in accordance with the relative movement of the trigger member 14, moves distally to a first speed. After the indicator member 150 starts to move distally, the delay structure 158 causes the indicator member 150 to advance at the first speed. Then, the delay of the indicator member 150 caused by the delay structure 158 is released, and the indicator member 150 advances at a second speed that is faster than the first speed and collides with a first collision target 156, thereby generating the completion signal.

[0136] According to this medicinal liquid administration device 10, the completion signal generating unit 15 generates a completion signal after administration of the medicinal liquid M is completed, so that the user can recognize it, thereby enabling the medicinal liquid M to effectively penetrate subcutaneously into the patient K after administration is completed.

[0137] The completion signal generating unit 15 includes a guide member 152 that supports the indicator member 150 so that the indicator member 150 is axially movable, and the delay structure 158 has a delay member 186 that is provided between the indicator member 150 and the guide member 152. The delay member 186 is held by the indicator member 150 and is slidable relative to the other of the guide members 152.

[0138] In this configuration, the delay member 186 can effectively slow down and delay the rate of distal movement of the indicator member 150 .

[0139] As shown in FIG. 12, the delay member 186 is fixed to the indicator member 150, and when the indicator member 150 has moved a predetermined distance since it began to move toward the tip, the delay member 186 moves away from the guide member 152, thereby releasing the sliding movement between the delay member 186 and the guide member 152.

[0140] This configuration effectively eliminates the reduction in the moving speed of the indicator member 150 caused by sliding between the delay member 186 and the guide member 152, allowing the indicator member 150 to advance toward the distal end at the second speed.

[0141] As shown in Figure 8, the first collision target 156 is arranged to face the tip of the indicator member 150 in the axial direction, and when the indicator member 150 moves in the tip direction, the tip collides with the first collision target 156.

[0142] The indicator member 150 has a first elastic portion 174 that is elastically deformable in the radial direction, and before the indicator member 150 moves toward the tip relative to the housing 12, the first flange portion 174C of the first elastic portion 174 and the base end of the first reduced diameter portion 154 abut in the axial direction, and as the first lock pin 124 moves toward the base end, the first lock pin 124 disengages from the inside of the first elastic portion 174, releasing the elastic deformation prevention state of the first elastic portion 174, and the first elastic portion 174 elastically deforms radially inward, causing the indicator member 150 to move toward the tip.

[0143] According to this configuration, as the trigger member 14 is moved relatively in the proximal direction, the first elastic portion 174 is brought into an elastically deformable state, and the indicator member 150 can be effectively moved in the distal direction.

[0144] 3, the device includes a start signal generating unit 110 that generates a start signal to notify the patient K of the start time of subcutaneous administration of the medicinal solution M as the plunger 64 moves toward the distal end. As the plunger 64 moves toward the distal end of the housing 12, the second elastic portion 76 is pushed radially inward by the second reduced diameter portion 114 and elastically deformed, and after the second elastic portion 76 passes through the second reduced diameter portion 114, the second elastic portion 76 elastically restores its original shape radially outward and collides with the second collision target portion 116, thereby generating the start signal.

[0145] According to this configuration, the user can effectively recognize not only the completion of administration of the medicinal liquid M, but also the administration start time when administration of the medicinal liquid M has started.

[0146] The plunger 64 is biased toward the tip by the elastic force of a second spring 70 provided inside the housing 12, and the second elastic portion 76 has a second flexible portion 76B extending along the axial direction of the plunger 64 and a second flange portion 76C provided at the base end of the second flexible portion 76B and protruding radially outward from the second flexible portion 76B. Before the plunger 64 moves distally relative to the housing 12, the second flange 76C and the base end of the second reduced diameter portion 114 abut in the axial direction, and the relative movement of the trigger member 14 causes the second lock pin 44 to move proximally, causing the second lock pin 44 to disengage from the interior of the second elastic portion 76, releasing the elastic deformation prevention state of the second elastic portion 76, and the second elastic portion 76 elastically deforms radially inward, causing the plunger 64 to move distally, and in the start signal generating unit 110, the second flange 76C collides with the second collision portion 116, generating a start signal.

[0147] According to this configuration, the plunger 64 can be effectively moved in the distal direction by relatively moving the trigger member 14 in the proximal direction, with the second elastic portion 76 in an elastically deformable state.

[0148] As shown in FIG. 3, the second lock pin 44 moves in the proximal direction due to the relative movement of the trigger member 14 in the proximal direction, and as shown in FIG. 10, as the second lock pin 44 moves in the proximal direction, the first lock pin 124 is pushed by the extension portion 48 of the second lock pin 44 and moves in the proximal direction.

[0149] According to this configuration, the first lock pin 124 and the second lock pin 44 can be effectively interlocked with each other as the trigger member 14 moves relative to each other.

[0150] 8, before the plunger 64 moves distally relative to the housing 12, the first inner wall 174A of the first elastic portion 174 contacts the first lock pin 124, and the second inner wall 76A of the second elastic portion 76 contacts the second lock pin 44 (see FIG. 4). As the trigger member 14 moves relative to the base end, the first lock pin 124 disengages from the first elastic portion 174, releasing the contact between the first inner wall 174A and the first elastic portion 174, and then the second lock pin 44 disengages from the second elastic portion 76, releasing the contact between the second inner wall 76A and the second elastic portion 76.

[0151] According to this configuration, by starting to move the indicator member 150 before the plunger 64, even if the user determines that the pressing force (relative movement) of the trigger member 14 is sufficient and releases the pressing force due to the start signal from the plunger 64, the indicator member 150 can generate a completion signal.

[0152] 17, a chemical solution administration device 10A according to the second embodiment includes a completion signal generating unit 15A. The completion signal generating unit 15A includes an indicator member 150, a guide member 152, and a first collision target 156A.

[0153] The indicator member 150 has a protruding portion 184 that is provided between the indicator body 170 and the intermediate portion 182 and protrudes radially outward. When the indicator member 150 moves toward the tip, the protruding portion 184 collides with the first collision target portion 156A, thereby generating a completion signal. In other words, the protruding portion 184 is a collision portion that can collide with the first collision target portion 156A.

[0154] The first collision target portion 156A is provided on the guide member 152. The first collision target portion 156A is formed to face the protrusion 184 of the indicator member 150 in the axial direction. The first collision target portion 156A is provided inside the guide member 152, and has a step portion provided at the boundary between the first cylindrical portion 152A and the second cylindrical portion 152B. The first collision target portion 156A is annular and extends in the radial direction of the guide member 152.

[0155] In a state before use of the medicinal solution administration device 10A, the protruding portion 184 is positioned further proximally (in the direction of arrow A) than the first collision target portion 156A. After the indicator member 150 moves toward the distal end at a first speed due to the elastic force of the first spring 180, as shown in FIG. 18, administration of the medicinal solution M is completed, the delay member 186 moves away from the guide member 152 in the distal end direction, and the indicator member 150 moves toward the distal end at a second speed. After the indicator member 150 moves at the second speed, as shown in FIG. 19, the protruding portion 184 collides with the first collision target portion 156A. The collision of the protruding portion 184 with the first collision target portion 156A generates a completion signal, which is a collision sound.

[0156] The second embodiment has the following advantages.

[0157] 19, when the indicator member 150 moves toward the tip, the protrusion 184 of the indicator member 150 collides with the first collision target 156A of the guide member 152. With this configuration, the guide member 152 also functions as the first collision target 156A, thereby simplifying the structure of the completion signal generating unit 15A.

[0158] The present disclosure is not limited to the above disclosure, and various configurations may be adopted without departing from the gist of the present disclosure. [Explanation of symbols]

[0159] 10, 10A...Medicinal solution administration device 12. Housing 14...Trigger member 15, 15A...Completion signal generation section 16...Syringe 150...Indicator member 156, 156A...First collided part 158...Delay Structure 161...Cylinder 164...Puncture needle 180...First spring K...Patient M: Chemical solution

Claims

1. Housing and a syringe having a cylindrical body accommodated in the housing and filled with a medicinal solution, and a puncture needle communicating with the cylindrical body for administering the medicinal solution into a living body; a trigger member that is pressed against the target to be punctured and moves relative to the housing in a proximal direction; a plunger provided inside the housing, movable in a distal direction relative to the syringe in response to relative movement of the trigger member in the proximal direction, and discharging the medicinal solution from the puncture needle by moving in the distal direction; a completion signal generating unit that generates a completion signal to notify the patient that the administration of the medicinal liquid into the living body has been completed after the administration of the medicinal liquid into the living body has been completed; A drug solution administration device comprising: The completion signal generating unit an indicator member provided inside the housing and movable relative to the housing in the distal direction in response to the relative movement of the trigger member; a first spring that biases the indicator member in the distal direction; a first impacted portion that impacts when the indicator member moves in the tip direction; a delay mechanism that controls the rate of movement of the indicator member in the distal direction to a first rate; Equipped with A drug solution administration device in which, after the indicator member begins to move toward the tip, the delay structure causes the indicator member to advance at the first speed, and after the delay of the indicator member caused by the delay structure is released, the indicator member advances at a second speed faster than the first speed and collides with the first collision portion, thereby generating the completion signal.

2. 2. The drug solution administration device according to claim 1, the completion signal generating unit includes a guide member that supports the indicator member so that the indicator member is movable in the axial direction; the delay structure includes a delay member disposed between the indicator member and the guide member; The delay member is held by one of the indicator member and the guide member and is slidable relative to the other of the indicator member and the guide member.

3. 3. The drug solution administration device according to claim 2, The delay member is fixed to the indicator member, and when the indicator member has moved a predetermined distance since it began to move toward the tip, the delay member moves away from the guide member, thereby releasing the sliding movement between the delay member and the guide member.

4. 4. The drug solution administration device according to claim 3, A drug solution administration device in which the first collision target is arranged to face the tip end of the indicator member in the axial direction, and when the indicator member moves in the tip direction, the tip end collides with the first collision target.

5. 4. The drug solution administration device according to claim 3, The indicator member has a protrusion that protrudes radially outward, the first impact portion is formed on the guide member so as to face the protrusion of the indicator member in the axial direction, When the indicator member moves in the distal direction, the protrusion collides with the first collision target.

6. 2. The drug solution administration device according to claim 1, The indicator member has a first elastic portion that is elastically deformable in a radial direction, The first elastic portion is a first flexible portion extending along the axial direction of the indicator member; a first flange portion provided at a base end of the first flexible portion and protruding radially outward from the first flexible portion; and The completion signal generating unit a first reduced diameter portion provided radially outward of the indicator member and projecting radially inward toward the indicator member; a first lock pin that is provided to be movable relative to the housing in the axial direction and that is inserted into the first elastic portion to prevent elastic deformation of the first elastic portion inward in the radial direction; Equipped with before the indicator member moves in the distal direction relative to the housing, the first flange portion and the base end of the first reduced diameter portion abut against each other in the axial direction; the first lock pin is movable in the proximal direction by relative movement of the trigger member in the proximal direction, A drug solution administration device in which the first lock pin is inserted into the inside of the first elastic portion and the elastic deformation of the first elastic portion in the radially inward direction is prevented, and when the first lock pin moves in the base end direction, the first lock pin disengages from the inside of the first elastic portion, releasing the elastic deformation prevention state of the first elastic portion, and the first elastic portion elastically deforms in the radially inward direction, causing the indicator member to move in the tip end direction.

7. 7. The drug solution administration device according to claim 6, a start signal generating unit that generates a start signal that notifies the patient of a start time for injecting the medicinal liquid into the living body in response to movement of the plunger toward the distal end; The start signal generating unit a second elastic portion provided on the plunger and elastically deformable in a radial direction; a second reduced diameter portion provided radially outward of the plunger and projecting radially inward toward the plunger; a second collision receiving portion provided further toward the tip than the second reduced diameter portion; and A drug solution administration device in which, as the plunger moves toward the tip of the housing, the second elastic portion is pushed radially inward by the second reduced diameter portion, causing it to elastically deform, and after the second elastic portion passes through the second reduced diameter portion, the second elastic portion elastically restores its radially outward shape and collides with the second collision portion, thereby generating the start signal.

8. 8. The drug solution administration device according to claim 7, The plunger is biased toward the distal end by a resilient force of a second spring provided inside the housing, The second elastic portion is a second flexible portion extending along the axial direction of the plunger; a second flange portion provided at a base end of the second flexible portion and protruding radially outward from the second flexible portion; and before the plunger moves in the distal direction relative to the housing, the second flange portion and the base end of the second reduced diameter portion abut against each other in the axial direction; The drug solution administration device includes a second lock pin that is movably provided inside the housing and that is inserted into the second elastic portion to prevent elastic deformation of the second elastic portion radially inward, the second lock pin is movable in the proximal direction by relative movement of the trigger member, When the second lock pin moves in the base end direction from an elastic deformation prevented state in which the second lock pin is inserted into the second elastic portion and the elastic deformation of the second elastic portion in the radially inward direction is prevented, the second lock pin is released from the inside of the second elastic portion and the elastic deformation prevented state of the second elastic portion is released, and the second elastic portion is elastically deformed inward in the radial direction, so that the plunger moves in the tip end direction, A medicinal solution administration device, wherein the start signal generating unit generates the start signal when the second flange portion collides with the second collision target portion.

9. 9. The drug solution administration device according to claim 8, the second lock pin has an extension portion that abuts against the first lock pin in the axial direction of the housing, The second lock pin moves in the base end direction due to the relative movement of the trigger member, and as the second lock pin moves in the base end direction, the first lock pin is pushed by the extension portion of the second lock pin and moves in the base end direction.

10. 9. The drug solution administration device according to claim 8, before the plunger moves in the distal end direction relative to the housing, a first inner wall of the first elastic portion and the first lock pin are in contact with each other, and a second inner wall of the second elastic portion and the second lock pin are in contact with each other; A drug solution administration device in which, as the trigger member moves relative to the base end, the first lock pin disengages from the first elastic portion, releasing contact between the first inner wall and the first elastic portion, and then the second lock pin disengages from the second elastic portion, releasing contact between the second inner wall and the second elastic portion.

Images