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US 2018/0021524 A1Published application
Puncture needle protection assembly, syringe assembly, and manufacturing method thereof
AssigneeTerumo Kabushiki Kaisha
InventorMasafumi Takemoto
Life of this patent
Estimating the term…
Abstract
A hook portion is formed to project from a columnar portion of a cover forming a needle cover body. The hook portion is hooked by a stopper wall of an outer cylinder, whereby the needle cover body is inhibited from slipping out of the outer cylinder. An inner cylinder biased toward a barrel by a spring member is accommodated inside the outer cylinder, that is, in a through hole. The needle cover body is provided continuously to the inner cylinder. In addition, the inner cylinder is held inside the outer cylinder as a cam projection is movably engaged with a guide passage formed in the outer cylinder.
Claims14
A puncture needle protection assembly configured to be mounted to a syringe that comprises:
- a barrel portion configured to be filled with a liquid drug;
- a needle holding portion that is located at a distal end of the barrel portion;
- and a hollow puncture needle that is held by the needle holding portion and includes a distal end projecting distal of the needle holding portion and a proximal end communicating with the inside of the barrel portion, the puncture needle protection assembly being configured to protect the puncture needle and comprising:
- an inner member that is mountable to the needle holding portion, the inner member comprising a cam projection and an abutment portion;
- a hollow outer cylinder member comprising comprising:
- a side wall defining a through hole extending from a distal end to a proximal end,
- a guide passage formed in the side wall,
- a stepped portion formed in the side wall,
- wherein the inner member is configured to be accommodated in the through hole,
- wherein the cam projection of the inner member is movable in the guide passage, and
- wherein the outer cylinder member is movable relative to the inner member along a central axis of the hollow outer cylinder member;
- a cylindrical needle cover body that includes a closed distal end and an open proximal end, the needle cover body being configured to cover the puncture needle and seal the distal end of the puncture needle, and comprising a part accommodated in the through hole and a distal end exposed from the through hole;
- and
- a biasing member that is accommodated in the through hole and biases the outer cylinder member with respect to the inner member,
- wherein, when the puncture needle protection assembly is attached to the syringe, the outer cylinder member is movable to:
- an initial position at which the cylinder member covers at least a part of the puncture needle,
- a proximal end position at which the cylinder member is displaced from the initial position in a proximal end direction with respect to the inner member and said part of the puncture needle is exposed, and
- a locking position at which the cylinder member is displaced from the proximal end position in a distal end direction with respect to the inner member and covers the distal end of the puncture needle,
- wherein the inner member is configured to rotate relative to the outer cylinder member by movement of the cam projection in the guide passage while the outer cylinder member moves from the initial position to the locking position, and is configured to restrict movement of the outer cylinder member in the proximal end direction with respect to the inner member when the outer cylinder member is moved to the locking position, and
- wherein the needle cover body includes a pressing portion that is configured to push the inner member toward the needle holding portion by abutting on the abutment portion of the inner member, and a hook portion that is configured to be hooked by the stepped portion of the outer cylinder member.
17 more elements
A syringe assembly comprising:
- a syringe comprising:
- a barrel portion configured to be filled with a liquid drug,
- a needle holding portion that is located at a distal end of the barrel portion, and
- a hollow puncture needle that is held by the needle holding portion and includes a distal end projecting distal of the needle holding portion and a proximal end communicating with the inside of the barrel portion;
- and
- a puncture needle protection assembly configured to protect the puncture needle and comprising:
- an inner member that is mountable to the needle holding portion, the inner member comprising a cam projection and an abutment portion,
- a hollow outer cylinder member comprising:
- a side wall defining a through hole extending from a distal end to a proximal end,
- a guide passage formed in the side wall,
- a stepped portion formed in the side wall,
- wherein the inner member is configured to be accommodated in the through hole,
- wherein the cam projection of the inner member is movable in the guide passage, and
- wherein the outer cylinder member is movable relative to the inner member along a central axis of the hollow outer cylinder member,
- a cylindrical needle cover body that includes a closed distal end and an open proximal end, the needle cover body being configured to cover the puncture needle and seal the distal end of the puncture needle, and comprising a part accommodated in the through hole and a distal end exposed from the through hole, and
- a biasing member that is accommodated in the through hole and biases the outer cylinder member with respect to the inner member,
- wherein, when the puncture needle protection assembly is attached to the syringe, the outer cylinder member is movable to:
- an initial position at which the cylinder member covers at least a part of the puncture needle,
- a proximal end position at which the cylinder member is displaced from the initial position in a proximal end direction with respect to the inner member and said part of the puncture needle is exposed, and
- a locking position at which the cylinder member is displaced from the proximal end position in a distal end direction with respect to the inner member and covers the distal end of the puncture needle,
- wherein the inner member is configured to rotate relative to the outer cylinder member by movement of the cam projection in the guide passage while the outer cylinder member moves from the initial position to the locking position, and is configured to restrict movement of the outer cylinder member in the proximal end direction with respect to the inner member when the outer cylinder member is moved to the locking position, and
- wherein the needle cover body includes a pressing portion that is configured to push the inner member toward the needle holding portion by abutting on the abutment portion of the inner member, and a hook portion that is configured to be hooked by the stepped portion of the outer cylinder member.
19 more elements
Dependencies are inferred from the claim text.