卡扣式移液吸头及移液器

Abstract

本实用新型揭示了一种卡扣式移液吸头及移液器，包括吸头本体，吸头本体的一端形成可与移液器连接的连接头，其另一端形成可吸液的吸嘴，连接头内设置有一弹性卡爪，弹性卡爪由一组沿连接头的内壁周向间隔均设的弹性卡扣构成，每个弹性卡扣均由外向内倾斜延伸，且其内端具有相对连接头的内壁移动的弹力，初始状态下，弹性卡扣的内端远离连接头的内壁，弹性卡爪的内端开口处内径收缩至最小，此时弹性卡爪的内端开口处内径小于连接头的内径，二者之间形成台阶面来与移液器卡接；第二状态下，弹性卡扣的内端靠近连接头的内壁，弹性卡爪的内端开口处内径扩大至最大，此时移液器可自由伸入或退出连接头。本方案采用卡接式的连接结构，方便快捷。

Claims

1. A snap-on pipette tip, comprising a hollow tip body (1) with one end forming a connector head connectable to a pipette and the other end forming a liquid suction nozzle, characterized in that: The connector is provided with an elastic claw, which is composed of a set of elastic buckles (101) evenly spaced along the inner wall of the connector. Each elastic buckle (101) extends inclinedly from the outside to the inside, and its inner end has an elastic force that moves relative to the inner wall of the connector. In the initial state, the inner end of the elastic buckle (101) is far away from the inner wall of the connector, and the inner diameter of the opening of the elastic claw is reduced to the minimum. At this time, the inner diameter of the opening of the elastic claw is smaller than the inner diameter of the connector, and a stepped surface (102) is formed between them to engage with the pipette. In the second state, the inner end of the elastic buckle (101) is close to the inner wall of the connector, and the inner diameter of the opening of the elastic claw is expanded to the maximum. At this time, the pipette can freely extend into or out of the connector.

2. The snap-on pipette tip of claim 1, wherein: The side wall of the connector is provided with a set of through holes (103) spaced circumferentially. Each through hole (103) contains an elastic buckle (101), and the top of each elastic buckle (101) is fixedly connected to the top of a through hole (103).

3. The snap-on pipette tip of claim 1, wherein: The sidewall of the connector is provided with a set of grooves spaced circumferentially, and each groove accommodates an elastic buckle (101). The top of each elastic buckle (101) is fixedly connected to the top of one of the grooves.

4. The snap-on pipette tip of claim 2 or 3, wherein: The outer wall of the connector is circumferentially distributed with a set of axially extending ribs (106), and a set of axially extending grooves (107) are provided between the set of ribs (106). The positions of the set of grooves (107) correspond one-to-one with the positions of the set of elastic buckles (101).

5. The snap-on pipette tip of claim 4, wherein: The inner diameter of the suction head body (1) gradually decreases from the connector to the nozzle, and a set of scale lines (104) are provided on the outer wall of the suction head body (1).

6. The snap-on pipette tip of claim 5, wherein: The set of graduation lines (104) includes at least a 200ul graduation line, a 500ul graduation line, a 750ul graduation line and a 1250ul graduation line, and the contents of the mouthpiece are not less than 200ul.

7. The snap-on pipette tip of claim 6, wherein: The elastic claw consists of four elastic buckles (101) symmetrically arranged circumferentially along the inner wall of the connector.

8. The snap-on pipette tip of claim 7, wherein: The suction head body (1) has a built-in filter element (105).

9. A pipette characterized by: The device includes a pipette body and a snap-on pipette tip as described in any one of claims 1-8. The bottom of the pipette body is provided with a set of pipette tips (2) for connecting to the connector. The tip (2) is hollow inside, and its outer wall has a protrusion (201) that matches the stepped surface (102). The tip (2) extends into the connector, and the protrusion (201) opens the inner end opening of the elastic claw until it engages with the stepped surface (102). A sealing ring (202) is provided on the outer wall of the tip (2) to seal the gap between the tip (2) and the connector. The bottom of the pipette body is also provided with… A suction head retraction ring (203) and a snap-lock retraction ring (204) are sleeved on the outside of the gun head (2) and can move axially relative to the connector. The outer diameter of the suction head retraction ring (203) is equivalent to the outer diameter of the connector, and the outer diameter of the snap-lock retraction ring (204) is equivalent to the protrusion (201). The suction head retraction ring (203) and the snap-lock retraction ring (204) move axially relative to the connector until the suction head retraction ring (203) abuts against the port of the connector. At the same time, the snap-lock retraction ring (204) extends into the inside of the connector and opens the inner end opening of the elastic claw. At this time, the gun head (2) can be withdrawn from the connector.

10. The pipette of claim 9, wherein: The tip ejection ring (203) is elastically connected to the bottom of the pipette body by a spring, and the snap-on ejection ring (204) is fixed to the bottom of the pipette body.

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