Tip attachment that can be attached to the tip of a syringe and barrel.

Abstract

The present invention provides a syringe and a tip attachment that can be properly attached to a barrel, such as a cap. [Solution] The mounting mechanism comprises a barrel including a tip portion having a base end and a discharge portion, and a tip mounting device that can be attached to the tip portion so as to be engageable with the discharge portion, wherein the tip portion has a mounting portion formed around the discharge portion, and the tip mounting device has a mounting portion that is attached to the mounting portion by rotating around the central axis and screwing into the mounting portion in the direction of the central axis, and the mounting mechanism formed by the mounting portion and the mounting portion comprises a restricting mechanism that restricts the movement of the tip mounting device in the direction of the central axis by the screwing, and a torque increasing mechanism that increases the rotational torque by further rotation in the state restricted by the restricting mechanism, causing one of the mounting portion and the mounting portion to bite into the other or into each other to form a biting portion.

Claims

1. A cylindrical barrel along its central axis, comprising a base end having an opening into which a piston can be pushed, and a tip end having a discharge section into which contents can be discharged, The device comprises a tip attachment that can be attached to the tip so as to be engageable with the discharge portion, The aforementioned tip portion has a mounting portion formed around the discharge portion, The aforementioned tip attachment device includes a part to be attached to the attachment portion, which is attached to the attachment portion by rotating around the central axis and screwing into the attachment portion in the direction of the central axis. The mounting portion and the portion to be mounted form a mounting mechanism. The aforementioned mounting mechanism is A restricting mechanism that restricts the movement of the tip attachment in the direction of the central axis by screwing it in, A syringe comprising a torque-increasing mechanism that increases rotational torque by further rotation while the syringe is restricted by the aforementioned restricting mechanism, causing one of the mounting portion and the mounted portion to bite into the other, or into each other.

2. The mounting portion is provided with a threaded portion into which the part to be mounted engages when the part to be mounted is screwed into the mounting portion. The mounting portion comprises a base end projection provided on the base end side that is radially convex, and a tip projection provided on the tip side that is radially convex, The base projection engages with the threaded portion to guide the screwing in when the part to be attached is screwed into the mounting portion, and engages with the threaded portion to guide the unscrewing when the screwing in is released. The syringe according to claim 1, wherein the tip projection functions as the torque-increasing mechanism and, upon rotation from a state restricted by the restricting mechanism, bites into the threaded portion and forms a biting portion.

3. The mounting portion is provided with a threaded portion into which the part to be mounted engages when the part to be mounted is screwed into the mounting portion. The mounting portion comprises a base end projection provided on the base end side that is radially convex, and a tip projection provided on the tip side that is radially convex, The base end projection engages with the threaded portion to guide the screwing in when the part to be mounted is screwed into the mounting portion, and also functions as the torque-increasing mechanism, and when rotation is performed from a state restricted by the restricting mechanism, it bites into the threaded portion and forms a biting portion. The syringe according to claim 1, wherein the tip projection engages with the threaded portion when the screw is released to guide the release of the screw.

4. A tip attachment that can be attached to the tip of a cylindrical barrel along its central axis, the barrel having a base end with an opening into which a piston can be pushed, and a tip end having a discharge portion for discharging contents and a mounting portion formed around the discharge portion, The aforementioned tip attachment is The part to be mounted is attached to the mounting part by rotating around the central axis and screwing into the mounting part in the direction of the central axis, A restricting portion that restricts the movement of the tip attachment in the direction of the central axis by screwing it in, A tip attachment comprising: a biting portion that forms a biting portion that bites into the attachment portion by further rotation while restricted by the aforementioned regulating portion.

5. The mounting portion is provided with a threaded portion into which the part to be mounted engages when the part to be mounted is screwed into the mounting portion. The mounting portion comprises a base end projection provided on the base end side that is radially convex, and a tip projection provided on the tip side that is radially convex, The base projection engages with the threaded portion to guide the screwing in when the part to be attached is screwed into the mounting portion, and engages with the threaded portion to guide the unscrewing when the screwing in is released. The tip protrusion functions as the biting portion, and by rotation from a state restricted by the restricting portion, it bites into the threaded portion and forms the biting portion, as described in claim 4.

6. The mounting portion is provided with a threaded portion into which the part to be mounted engages when the part to be mounted is screwed into the mounting portion. The mounting portion comprises a base end projection provided on the base end side that is radially convex, and a tip projection provided on the tip side that is radially convex, The base end projection engages with the threaded portion to guide the screwing in when the part to be mounted is screwed into the mounting portion, and functions as the biting portion, and when rotated from a state restricted by the restricting portion, it bites into the threaded portion and forms a biting portion. The tip attachment according to claim 4, wherein the tip projection engages with the threaded portion when the screw is released to guide the release of the screw.

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