Negative pressure sealing sampling test tube cover

Abstract

The utility model discloses a negative pressure sealing sampling test tube cover which comprises a cover body (1) and is characterized in that an annular groove (2) is formed in an opening of the cover body (1), a rubber sealing piece (3) is arranged in the annular groove (2), an annular protrusion (4) is arranged in the center of the rubber sealing piece (3), and the annular protrusion (4) is provided with a sealing ring (5). A plurality of fan-shaped sealing pieces (5) evenly distributed in the circumferential direction are arranged on the inner ring of the annular protrusion (4), and in the non-working state, every two adjacent fan-shaped sealing pieces (5) make contact with each other and form a cone protruding out of the rubber sealing piece (3).

Description

Technical Field

[0001] The utility model relates to the field of medical equipment, in particular to a negative pressure sealed sampling test tube cover. Background Art

[0002] In the medical field, test tubes are often needed to sample body fluids such as blood and urine, especially some negative pressure sampling tubes. When not in use, they must be equipped with test tube caps. The test tube caps can act as a seal, so that the inner cavity of the sampling tube can be maintained in a negative pressure state to ensure its normal use.

[0003] Taking blood drawing as an example, after the needle is inserted into the human blood vessel, the connector connected to the needle through a hose is inserted into the sampling test tube. At this time, the connector is inserted into the test tube cap. Since the pressure in the test tube is relatively small (blood pressure), the blood will quickly enter the test tube to achieve sampling.

[0004] In order to achieve the above purpose, the test tube cover is required to have good sealing performance, and at the same time, the joint on the medical device can smoothly pierce the test tube cover, and after piercing, the test tube cover still needs to seal the joint.

[0005] Traditional negative pressure sampling test tubes have certain problems with sealing, especially when the connector is inserted into the test tube, a good sealing effect cannot be maintained between the connector and the test tube cap, which will affect the speed at which blood enters the test tube, thereby reducing the efficiency of blood collection.

[0006] At the same time, test tubes are also needed in some urine collection devices. If there is a lot of urine residue in this type of urine collection device, there may be problems of environmental pollution during subsequent processing. If all the urine in the sampling cup can be sucked into the test tube and the urine residue in the cup is minimized, this problem can be solved to a certain extent.

[0007] Therefore, a method or device capable of solving the above problems is now needed. Summary of the invention

[0008] The utility model aims to solve the above-mentioned deficiencies in the prior art and proposes a negative pressure sealed sampling test tube cover with simple structure, ingenious design, reasonable layout, good sealing effect and the ability to utilize the pressure change in the test tube at the end of the work to absorb liquid samples.

[0009] The technical solution of the utility model is: a negative pressure sealed sampling test tube cover, comprising a cover body 1, characterized in that: an annular groove 2 is arranged at the opening of the cover body 1, a rubber sealing sheet 3 is arranged in the annular groove 2, an annular protrusion 4 is arranged at the center of the rubber sealing sheet 3, and a plurality of fan-shaped sealing sheets 5 evenly distributed in the circumferential direction are arranged on the inner circle of the annular protrusion 4. In a non-working state, adjacent fan-shaped sealing sheets 5 are in contact with each other, and they form a cone protruding from the rubber sealing sheet 3.

[0010] The annular protrusion 4 is located on the top end surface of the rubber sealing piece 3 .

[0011] The annular protrusion 4 is located on the bottom end surface of the rubber sealing piece 3 .

[0012] Compared with the prior art, the utility model has the following advantages:

[0013] The negative pressure sealed sampling test tube cover of this structural form has a simple structure, ingenious design and reasonable layout. It designs a special structure to solve various problems existing in the use of the traditional cover body matched with the test tube. First, a layer of rubber sealing sheet is covered at the opening of the cover body for sealing. At the same time, an opening for inserting a connecting plug is arranged at the center of the rubber sealing sheet, and a plurality of fan-shaped sealing sheets evenly distributed in the circumferential direction are arranged at the opening. These fan-shaped sealing sheets are tightly fitted together to seal the test tube. At the same time, the cone formed by these fan-shaped sealing sheets occupies a certain space. When the connecting plug is inserted into the rubber sealing sheet, the cone will be reversely pushed into the bottom of the rubber sealing sheet, and when the connecting plug is pulled out, the cone will be brought out to the top of the rubber sealing sheet by the connecting plug under the action of friction. This change will change the volume inside the test tube, and then change the air pressure inside the test tube. A certain negative pressure will be generated in the test tube during the process of pulling out the connecting plug. This negative pressure can suck a part of the collected liquid sample into the test tube, thereby achieving the purpose of preventing pollution and improving sampling efficiency. In addition, the test tube cover has a simple manufacturing process and low manufacturing cost, so it can be said that it has multiple advantages and is particularly suitable for promotion and application in this field, and its market prospect is very broad. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model.

[0015] Figure 2 It is a structural schematic diagram of the second embodiment of the present utility model. DETAILED DESCRIPTION

[0016] The specific implementation of the present utility model will be described below in conjunction with the accompanying drawings. Figure 1 , Figure 2As shown: a negative pressure sealed sampling test tube cover, including a cover body 1, an annular groove 2 is arranged at the opening of the cover body 1, a rubber sealing sheet 3 is arranged in the annular groove 2, an annular protrusion 4 is arranged at the center of the rubber sealing sheet 3, and a plurality of fan-shaped sealing sheets 5 evenly distributed in the circumferential direction are arranged on the inner circle of the annular protrusion 4. In a non-working state, adjacent fan-shaped sealing sheets 5 are in contact with each other, and they form a cone protruding from the rubber sealing sheet 3.

[0017] The annular protrusion 4 is located on the top end surface or the bottom end surface of the rubber sealing piece 3 .

[0018] The working process of the negative pressure sealing sampling test tube cover of the embodiment of the utility model is as follows: when in use, the cover body 1 is connected to the tube mouth of the test tube (the two are connected in a conventional manner, such as threaded connection or fastened by a buckle structure). When it is necessary to use the test tube to collect body fluids such as blood samples and urine samples, the joint of the collection device is directly pierced through the rubber sealing sheet 3 on the test tube cover, specifically, the vertebral body composed of multiple fan-shaped sealing sheets 5 is pierced.

[0019] When preparing the test tube cover, the adjacent rubber sealing sheets 3 can be cut apart, and the inside of the test tube can be sealed by relying on the elasticity of the rubber sealing sheets 3 when not in use. Alternatively, a cutting seam can be made at the junction of the adjacent rubber sealing sheets 3 (but not cut off). In this case, the cones formed by all the rubber sealing sheets 3 are continuous and integral structures, thereby sealing the inside of the test tube.

[0020] The inside of the test tube equipped with this test tube cover can be evacuated or not. When evacuating, under the effect of negative pressure, body fluids such as blood samples and urine samples will be sucked into the test tube; when not evacuating, you can choose a connection plug with a built-in exhaust pipeline to ensure that body fluids can smoothly enter the test tube;

[0021] When the connecting plug is inserted into the rubber sealing sheet 3, the vertebral body will be pushed in the reverse direction to the bottom of the rubber sealing sheet 3. When the connecting plug is pulled out, the vertebral body will be brought out to the top of the rubber sealing sheet 3 again by the connecting plug under the action of friction. This change will change the volume inside the test tube, and then change the air pressure inside the test tube. A certain negative pressure will be generated in the test tube during the process of pulling out the connecting plug. This negative pressure can suck a part of the collected liquid sample into the test tube, thereby achieving the purpose of preventing pollution and improving sampling efficiency.

[0022] When the connecting plug pushes away the rubber sealing sheet 3, the annular protrusion 4 will wrap around the connecting plug to play a sealing role.

Claims

1. A negative pressure sealed sampling test tube cover, comprising a cover body (1), characterized in that: An annular groove (2) is provided at the opening of the cover body (1), a rubber sealing sheet (3) is provided in the annular groove (2), an annular protrusion (4) is provided at the center of the rubber sealing sheet (3), and a plurality of fan-shaped sealing sheets (5) are provided on the inner ring of the annular protrusion (4) and are evenly distributed in the circumferential direction. In a non-working state, adjacent fan-shaped sealing sheets (5) are in contact with each other and form a cone protruding from the rubber sealing sheet (3).

2. The negative pressure sealed sampling test tube cover according to claim 1, characterized in that: The annular protrusion (4) is located on the top end surface of the rubber sealing sheet (3).

3. The negative pressure sealed sampling test tube cover according to claim 1, characterized in that: The annular protrusion (4) is located on the bottom end surface of the rubber sealing sheet (3).

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