注射器浮阀及自排气注射器

Abstract

本实用新型公开了一种注射器浮阀及自排气注射器，涉及医疗器械技术领域，该自排气注射器包括针筒和活塞推杆，活塞推杆在针筒的内腔中上下滑动，针筒的内腔中位于活塞推杆下方的部分构成贮液腔，活塞推杆内设气道，气道的下端通过容纳腔与贮液腔连通；该注射器浮阀包括限位肩部、连接颈部和浮子部分；限位肩部架设在容纳腔底面；连接颈部连接于限位肩部下方；连接颈部沿上下方向活动穿设于容纳腔下方的气道中，连接颈部的周侧与容纳腔下方的气道之间存在预设间隙；浮子部分连接于连接颈部下方；浮子部分在贮液腔中液体的浮力作用下向上移动并封堵气道。本方案可在排出注射液中混入的气体的同时，避免注射液被一并排出而造成浪费及环境污染。

Claims

1. A syringe float valve characterized by, The invention relates to a self-venting syringe, which includes a syringe and a piston rod. The piston rod is slidably fitted into the inner cavity of the syringe in a vertical direction. The portion of the inner cavity of the syringe located below the piston rod forms a liquid storage chamber. An air passage is provided inside the piston rod, and the lower end of the air passage communicates with the liquid storage chamber through a receiving cavity. The syringe float valve includes: A limiting shoulder is provided for mounting on the bottom surface of the receiving cavity; A connecting neck is connected to the lower part of the limiting shoulder; the connecting neck is used to be movably inserted into the airway below the receiving cavity in the vertical direction, and there is a preset gap between the periphery of the connecting neck and the cavity wall of the airway below the receiving cavity. The float portion is connected below the connecting neck; the float portion is used to move upward under the buoyancy of the liquid in the reservoir cavity to block the air passage below the receiving cavity.

2. The float valve of claim 1, wherein The syringe float valve is a rotating body, and the rotation center axis of the syringe float valve extends in the vertical direction; the upper side of the float part extends downward in a direction away from the rotation center axis, and the upper side of the float part is used to fit against the lower side of the piston rod under the buoyancy of the liquid in the reservoir.

3. The float valve of claim 2, wherein The upper side of the float section is curved.

4. The float valve of claim 1 wherein, The syringe float valve is a rotating body, and the rotation center axis of the syringe float valve extends in the vertical direction; the bottom surface of the float part extends downward in the direction close to the rotation center axis.

5. The float valve of claim 4, wherein the float is a hollow float having a hollow interior. The limiting shoulder is provided with a weight-reducing cavity, which extends downward to the float portion. The bottom surface of the weight-reducing cavity extends downward in a direction close to the rotation center axis. The solid portion between the bottom surface of the weight-reducing cavity and the bottom surface of the float portion forms an elastic lever arm. The inner end of the elastic lever arm is used to deflect upward under the buoyancy of the liquid in the storage cavity, so as to drive the outer end of the elastic lever arm to deflect outward in a direction away from the rotation center axis.

6. The float valve of claim 5, wherein the float is a hollow float having a hollow interior. The thickness of the elastic lever arm in the vertical direction gradually decreases along the direction close to the rotation center axis.

7. The float valve of claim 1, wherein The maximum cross-sectional area of ​​the float portion is greater than the maximum cross-sectional area of ​​the limiting shoulder portion.

8. The float valve of claim 1 wherein, The syringe float valve has a weight-reducing cavity.

9. The float valve of any one of claims 1 to 8, wherein, The syringe float valve is made of elastic material.

10. A self-venting syringe characterized by, The self-venting syringe includes a syringe barrel, a piston rod, and a syringe float valve as described in any one of claims 1 to 9; the piston rod is slidably fitted in the inner cavity of the syringe barrel in the up-down direction, and the portion of the inner cavity of the syringe barrel located below the piston rod constitutes a liquid storage chamber; the piston rod is provided with an air passage, and the lower end of the air passage communicates with the liquid storage chamber through a receiving cavity; The limiting shoulder is mounted on the bottom surface of the receiving cavity; the connecting neck is connected to the lower part of the limiting shoulder; the connecting neck is movably inserted into the air passage below the receiving cavity in the vertical direction, and there is a preset gap between the periphery of the connecting neck and the cavity wall of the air passage below the receiving cavity; the float part is connected to the lower part of the connecting neck; the float part is used to move upward under the buoyancy of the injection liquid in the reservoir to block the air passage below the receiving cavity.

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