| CPC A61J 1/2096 (2013.01) [A61M 5/2448 (2013.01); A61M 5/32 (2013.01)] | 20 Claims |
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1. A closed type medicine liquid transfer device with double-chamber internal circulation, comprising:
a double-chamber syringe;
a dispensing needle assembly; and
a syringe needle sealing assembly,
wherein the double-chamber syringe consists of:
a first syringe barrel;
a first piston rod slidable back and forth along an inner cavity in the first syringe barrel;
a second syringe barrel; and
a second piston rod slidable back and forth along the inner cavity in the second syringe barrel,
wherein the first syringe barrel and the second syringe barrel are fixedly arranged in parallel, in the same direction and with flush front ends,
a first joint is provided on a front end face of the first syringe barrel, and
a second joint is provided on a front end face of the second syringe barrel,
wherein the dispensing needle assembly comprises:
a dispensing needle; and
a needle seat,
wherein the dispensing needle is fixedly connected to the needle seat with a rear end of the dispensing needle embedded into a front end of the needle seat,
a rear end of the needle seat is provided with a first connection hole matched with the first joint and a second connection hole matched with the second joint, and
the needle seat is internally provided with a first channel and a second channel in communication with the first connection hole and the second connection hole, respectively and independent of each other;
the dispensing needle is a double-layer columnar structure including an inner columnar channel and a side annular channel,
wherein the inner columnar channel is in communication with the first channel, and the side annular channel is in communication with the second channel,
the dispensing needle consists of an inner needle tube and an outer needle tube, the inner needle tube is inserted in the outer needle tube, with both ends extending out of the outer needle tube, so that the inner columnar channel is formed by an inner cavity of the inner needle tube, and the side annular channel is formed by a cavity between the outer needle tube and the inner needle tube, and
the dispensing needle assembly is fixed and closely connected to the double-chamber syringe by embedding the first joint and the second joint into the first connection hole and the second connection hole, respectively;
wherein the syringe needle sealing assembly includes:
a sheath, a closing member and an elastic member arranged coaxially with the dispensing needle,
the sheath is a hollow cylindrical structure with front and back openings, and is movable axially and sleeved onto the front end of the needle seat,
the closing member is made of an elastic material, and fixedly disposed inside a front barrel of the sheath; a pore channel for passage of the dispensing needle is provided at a central axis of the closing member, and has an inner diameter smaller than an outer diameter of the dispensing needle,
the elastic member is provided between the closing member and the needle seat, and provides axial elastic support for the closing member at the front end against the needle seat,
in a non-pressed state, the elastic member extends axially so that the sheath shields the dispensing needle inside, and under an elastic force of the elastic material, the closing member tightly wraps a front end part of the dispensing needle and seals front channel openings of the inner columnar channel and the side annular channel inside; and
in a pressed state, the elastic member is axially compressed, and the front end part of the dispensing needle, including the front channel openings of the inner columnar channel and the side annular channel, penetrates out of the sheath through the pore channel in the closing member.
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