Abstract: A syringe assembly includes a plate-shaped seal member that seals a distal opening of a distal nozzle portion of a syringe; and a tubular cover member. The cover member has a base portion and a mounting portion. The mounting portion has two claw portions, two first column portions arranged on both sides of one of the two claw portions, and two second column portions arranged on both sides of the other of the two claw portions. An outer peripheral portion of the mounting portion has two outer peripheral notch portions. An inner peripheral portion of the mounting portion has two inner peripheral recessed portions.

Abstract: An administering instrument is disclosed, which is capable of preventing a needle tube from coming out of a living body during administration of a drug solution and a drug solution administering system including the administering instrument and a medicinal solution administering device. The administering instrument includes a puncture part that has a contact surface contacting a body surface H of a user, a needle holding part for holding a needle tube, and a communication passage communicating with a lumen of the needle tube. The puncture part includes a fixing part that is disposed above the contact surface and fixes the first end part of the tube to the puncture part in a state where the first end part of the tube is inclined toward the contact surface of the puncture part.

Abstract: A drug solution injection device is provided with a barrel, a gasket, and a plunger mechanism. The plunger mechanism is provided with a rotation member, a first moving member, and a second moving member. The plunger mechanism is configured to perform a first extension operation and a second extension operation. In the first extension operation, the first moving member advances to a predetermined position with respect to the rotation member and the second moving member in conjunction with rotation of the rotation member. In the second extension operation, the second moving member advances with respect to the rotation member together with the first moving member after the first extension operation, in conjunction with rotation of the rotation member.

Abstract: A liquid administration device includes: a structure that includes: a cylindrical body including a bottom part in a distal portion and an opening in a proximal portion, a needle tube positioned in the distal portion of the cylindrical body, the needle tube having a sharp needle tip at a distal end, wherein a proximal end of the needle tube is communicable with an inside of the cylindrical body, and a gasket installed in the cylindrical body, the gasket being slidable in an axial direction of the cylindrical body; an operation member configured to perform a pressing operation by pressing the gasket such that a liquid is discharged from the needle tube; a pressing mechanism configured to generate a pressing force for pressing the gasket; and a pressing force transmission inhibiting mechanism configured to inhibit transmission of the pressing force to the gasket during the pressing operation.

Abstract: A puncture assisting device includes a pair of plate-like pinching portions that face each other, and that are attached to each other so as to be openable and closeable; a biasing portion that biases the pair of pinching portions to be in a closed position; a pair of gripping portions configured to operate the pair of pinching portions to be in an open position; and a rod insertion portion that is disposed between the pair of pinching portions, the rod insertion portion being configured such that a rod portion of a syringe is insertable into the rod insertion portion to widen a gap between the pair of pinching portions.

Abstract: A liquid administration device includes an operation unit; a structure that includes an accommodation body configured to accommodate the liquid therein and a needle tube communicatable with the inside of the accommodation body; a cover member that is movable between a protection position and an exposure position; a biasing member that biases the cover member in a distal direction; an exposure restriction unit configured to restrict movement of the cover member to the exposure position when a movement amount of the cover member with respect to the structure reaches a predetermined exposure restriction operation amount; and a movement amount restriction unit.

Abstract: A liquid administration device includes a structure that includes an accommodation body configured to accommodate liquid therein and a needle configured to communicate with an inside of the accommodation body; an operation unit configured to discharge the liquid inside the accommodation body from the needle by moving toward the structure in a distal direction; a cover member that is movable between a protection position at which the needle is covered and an exposure position at which the needle is exposed; a first biasing member that biases the operation unit toward the structure in the distal direction; and a second biasing member that biases the cover member in the distal direction. The operation unit has a first contact portion and the structure has a second contact portion, the contact portions being configured to come into contact with each other when the operation unit moves toward the structure in the distal direction.

Abstract: A liquid administration device includes an inner structure that includes a cylindrical body that has a bottom part in a distal portion thereof and an opening portion in a proximal portion thereof, a needle tube that is mounted in the distal portion of the cylindrical body and has a sharp needle tip at a distal end and a proximal end of which is communicatable with an inside of the cylindrical body, and a gasket that is located in the cylindrical body; an operation member that includes a plunger, the operation member being configured to perform a pressing operation in which the plunger is moved relative to the cylindrical body in a distal direction while being pressed; an engagement portion that includes: a first engagement portion and a second engagement portion.

Abstract: A liquid administration tool includes a structure including a tubular body in which liquid is fillable, the tubular body having a bottom portion at a distal end and, an opening portion at a proximal end, and a needle tube positioned at a distal portion of the tubular body, the needle tube having a needle tip at a distal end thereof, and the needle tube being communicable at a proximal end thereof with an inside of the tubular body; an operation member having a pusher; a cover member; a biasing member configured to bias the cover member in the distal direction; a locking unit configured to restrict the movement of the cover member; and a movement amount restriction unit configured to restrict the movement amount of the cover member.

Abstract: A resin hollow needle includes a distal end section including a puncture end portion, a large-diameter section having a diameter greater than that of the distal end section, a tapered section that is located between the large-diameter section and the distal end section, and a hub section. The distal end section includes a hole that is provided on a proximal end side in comparison to a distal end and on a distal end side of the tapered section, and communicates with the inside and the outside of a hollow needle, and a tapered puncture end portion. The distal end section has a total length of 7 to 14 mm and a maximum outer diameter of 1.5 to 3.0 mm. The tapered section has a length of 0.3 to 4.7 mm and a taper angle of 10° to 50°. The large-diameter section has a length of 4 mm or greater, and a distal end outer diameter that is greater than the maximum outer diameter of the distal end section by 0.6 to 3.0 mm.

Abstract: A liquid administration device includes: a cylindrical body filled with liquid; a needle tube configured to communicate or be communicable with the cylindrical body at its tip side, and to have a sharp needle tip; a gasket configured to slide within the cylindrical body; an operation member configured to to discharge the liquid by pressing the gasket toward the tip direction; a cover member configured to be capable of moving to a first position, in which at least the needle tip is covered, to a second position, in which the needle tip is exposed, and to a third position, in which at least the needle tip is re-covered; and a cover member that can move from the first position to the second position to a third position to re-cover the needle tip.

Abstract: A liquid administration device includes a cylindrical body; a needle tube configured to communicate or to be communicable with the cylindrical body at a tip side of the cylindrical body; a gasket that is slidable within the cylindrical body; an operation member configured to perform pressing operation to discharge the liquid from the needle tube by pressing the gasket toward the tip direction; a restricting member arranged at an outer peripheral side of the cylindrical body, and configured to be positioned to restrict the pressing operation; and a cover member that is movable to a first position, in which at least the needle tip of the needle tube is covered, and to a second position, retreated in a base end direction from the first position, in which the needle tip is exposed.