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 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 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 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 communicatable with the 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 the 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 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 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.