Abstract: A protection device is attachable to a syringe that includes a needle. The protection device includes an inner cylinder having a cam structure with at least one protrusion; an outer cylinder that covers the inner cylinder and the needle; and a spring. The outer cylinder has a guiding path structure including at least one guiding path. The guiding path structure includes an elastic member allowing the cam structure to move; and an inner edge provided at a position in a peripheral wall of the outer cylinder different from the elastic member. The inner edge is configured to regulate movement of the cam structure by engaging with the cam structure.

Abstract: A syringe assembly includes a barrel including a barrel body portion, a cylindrical barrel end portion disposed at a distal end of the barrel body portion, the cylindrical barrel end portion including an annular head portion and an annular recessed portion, and a puncture needle having a puncture needle tip and having a proximal end fixedly inserted into the barrel end portion; and a seal cap mounted to the barrel, the seal cap including a closed distal end portion, an open proximal end portion, a hollow portion including (i) a barrel end storage portion, the barrel end storage portion being configured to store the barrel end portion, and (ii) a puncture needle storage portion extending from a distal end of the barrel end storage portion, an insertion portion configured to receive the puncture needle tip, and a projection portion formed on an inner surface of the barrel end storage portion.

Abstract: An elastic cap detachably mountable to a barrel tip portion of a barrel so as to seal a tip of a needle hole includes a cylindrical receiving hole configured to receive at least part of a barrel tip portion and a puncture needle of a barrel. The receiving hole includes a first inner diameter portion having a smaller diameter than an outer diameter of the annular head; a stopper portion provided at an end of the first inner diameter portion; and a second inner diameter portion that is formed from the stopper portion to a bottom wall provided at an end of the second inner diameter portion, the second inner diameter portion having a smaller diameter than the first inner diameter portion.

Abstract: An elastic cap detachably mountable to a barrel tip portion of a barrel so as to seal a tip of a needle hole includes a cylindrical receiving hole configured to receive at least part of a barrel tip portion and a puncture needle of a barrel. The receiving hole includes a first inner diameter portion having a smaller diameter than an outer diameter of the annular head; a stopper portion provided at an end of the first inner diameter portion; and a second inner diameter portion that is formed from the stopper portion to a bottom wall provided at an end of the second inner diameter portion, the second inner diameter portion having a smaller diameter than the first inner diameter portion.

Abstract: An elastic cap detachably mountable to a barrel tip portion of a barrel so as to seal a tip of a needle hole includes a cylindrical receiving hole configured to receive at least part of a barrel tip portion and a puncture needle of a barrel. The receiving hole includes a first inner diameter portion having a smaller diameter than an outer diameter of the annular head; a stopper portion provided at an end of the first inner diameter portion; and a second inner diameter portion that is formed from the stopper portion to a bottom wall provided at an end of the second inner diameter portion, the second inner diameter portion having a smaller diameter than the first inner diameter portion.

Abstract: A method of assembling a syringe with needle is provided. The method may include preparing a mold for forming a tube hole of a main body of the syringe, a first part and a second part for forming a connection part of the syringe, and a third part for forming a close contact part of the syringe, supporting and securing a proximal portion of a needle tube by the mold, injecting the resin into the mold, and forming the syringe and the needle tube integrally by forming the syringe around the needle tube.

Abstract: A syringe with an injection needle includes an outer cylinder molded with a resin and a metallic injection needle. The outer cylinder includes a cylinder tip at a distal end, an opening at a proximal end, and a barrel section having a cavity located between the cylinder tip and the opening. The injection needle includes a joint portion fixed inside the cylinder tip by insert molding or heat welding. An uneven portion having an average surface roughness of at least 0.2 ?m is formed in a region having an area of at least 1 mm2 on an outer peripheral surface of the joint portion. The joint portion is firmly fixed inside the cylinder tip by the resin which closely contacts and covers respective recesses and protrusions of the uneven portion. Sterilization by an autoclave or ethylene oxide gas is applied to the outer cylinder having the injection needle fixed inside.

Abstract: A syringe assembly includes a barrel, and a seal cap mounted to the barrel. The seal cap includes a closed distal end portion, an open proximal end portion, a hollow portion including a barrel end storage portion configured to store a barrel end portion, and a puncture needle storage portion extending from the barrel end storage portion, an insertion allowing portion configured to receive a puncture needle tip of a puncture needle guided to the distal end of the puncture needle storage portion, and a projection portion formed on an inner surface of the barrel end storage portion. The projection portion has a top portion, a distal inclined portion, and a proximal inclined portion extending from the top portion toward the open proximal end portion. A non-stick surface for inhibiting sticking to a barrel end portion of the barrel is formed on an inner surface of the projection portion.

Abstract: A puncture needle assembly including: a puncture device which is provided with a needle tube having a sharp needlepoint at the tip thereof, and also with a protector which is supported relative to the needle tube so as to be movable in the axis direction of the needle tube between a first position at which the protector covers at least the needlepoint of the needle tube and a second position at which the protector exposes the needlepoint and is located further on the base end side than the first position; a cap which is removably mounted to the puncture device; a lock which can, when the protector is at the first position, maintain the position of the protector; and a lock release which, when the protector moves from the first position to the second position, enables the protector to move by releasing the locked state maintained by the lock.

Abstract: A liquid injection instrument includes an internal structural body having a cylindrical body that has a cylindrical shape and has an inner cavity part in which a drug solution is housed, a hollow needle disposed at a distal part of the cylindrical body, a gasket slidable in the cylindrical body, and a plunger that carries out movement operation of the gasket along an axial direction of the cylindrical body. The liquid injection instrument further includes a cylindrical protector disposed on an outer circumferential side of the internal structural body movably along the axial direction of the internal structural body. The protector has an outside engagement piece and the cylindrical body has an inside engagement piece engageable with the outside engagement piece.

Abstract: An outer cylinder for a prefilled syringe has an outer cylinder body with a distal part having an opening and an outer cylinder closure member which seals the opening, accommodates a sealing member through which a needle portion of a hollow needle is penetrable, and is mounted on the distal part of the outer cylinder body. The outer cylinder closure member has a piercing member mounting portion on which the piercing member is mountable and a regulation portion which regulates separation and rotation of the outer cylinder closure member. The outer cylinder closure member further includes a portion which engages the piercing member side engaging portion when the outer cylinder is pressed into the piercing member and which regulates the separation of the piercing member from the outer cylinder closure member, after the outer cylinder closure member side engaging portion engages the piercing member side engaging portion.

Abstract: An injector includes a hollow needle; a main body unit including a needle holding portion that holds the needle; and a protection device configured to cover the needle before and after puncturing a puncture target with the needle. The protection device includes: an inner member attached to the needle holding portion and being freely rotatable around an outer periphery of the needle holding portion; and an outer member configured to (i) cover an outer side of the needle and the inner member before puncturing, (ii) expose the needle by moving toward a proximal end side relative to the main body unit at a time of puncturing, and (iii) cover a distal end of the needle by moving toward a distal end side relative to the main body unit after puncturing.

Abstract: A method for assembling an assembly for a syringe that includes a cylindrical outer barrel; a puncture needle; and a cylindrical cap. The method includes forming a closed space in a receiving hole of the cap by inserting the puncture needle and a barrel tip at least partially into the receiving hole before a tip end of the puncture needle is inserted into a bottom wall of the cap; discharging gas in the closed space; and sealing a tip end of the needle hole by further inserting the barrel tip into the receiving hole to insert the tip end of the puncture needle into the bottom wall.

Abstract: A syringe assembly includes a barrel including a barrel body portion, a cylindrical barrel end portion disposed at a distal end of the barrel body portion, the cylindrical barrel end portion including an annular head portion and an annular recessed portion, and a puncture needle having a puncture needle tip and having a proximal end fixedly inserted into the barrel end portion; and a seal cap mounted to the barrel, the seal cap including a closed distal end portion, an open proximal end portion, a hollow portion including (i) a barrel end storage portion, the barrel end storage portion being configured to store the barrel end portion, and (ii) a puncture needle storage portion extending from a distal end of the barrel end storage portion, an insertion portion configured to receive the puncture needle tip, and a projection portion formed on an inner surface of the barrel end storage portion.

Abstract: An elastic cap detachably mountable to a barrel tip portion of a barrel so as to seal a tip of a needle hole includes a cylindrical receiving hole configured to receive at least part of a barrel tip portion and a puncture needle of a barrel. The receiving hole includes a first inner diameter portion having a smaller diameter than an outer diameter of the annular head; a stopper portion provided at an end of the first inner diameter portion; and a second inner diameter portion that is formed from the stopper portion to a bottom wall provided at an end of the second inner diameter portion, the second inner diameter portion having a smaller diameter than the first inner diameter portion.

Abstract: A first connector is provided and includes a first connector body having a cylindrical outer tube, a cylindrical inner tube, and a hub; a hollow needle supported by the hub; a first sealing member supported by the inner tube; a coil spring that biases the hub in a proximal direction and biases the first sealing member in the distal direction; and gripping and pressing members disposed on the outer tube. A plurality of pawls are formed on a flange of the hub. A plurality of ratchet teeth are formed on an inner circumferential portion of a proximal portion of the outer tube. Each of the ratchet teeth and each of the pawls of the hub form an engagement-disengagement mechanism.

Abstract: A connector assembly includes a first connector having a tubular first connector body, a hollow needle inside the first connector body and a first sealing component piercable by the needle, and a second connector having a tubular second connector body and a second sealing component. The second sealing component is in the second connector body, is attached to a first piercing section when inserted into the first connector body, and, in that state, is pierced by the needle together with the first piercing section. The connector assembly also includes a restriction which, when the second connector is inserted into the first connector, temporarily interrupts and restricts the insertion operation, but allows resumption of such operation when the restriction is removed, and which, when the second connector is withdrawn from the first connector, temporarily interrupts and restricts the withdrawing operation, but allows such operation to resume when the restriction is removed.