Venous blood sampling needle

Abstract

The present invention provides a venous blood sample collection needle, comprising a venous puncture part and a docking part, the venous puncture part and the docking part are connected by a hose, one end of the venous puncture part is connected to the venous puncture needle, and the other end of the venous puncture part is connected to the hose, the docking part is a three-way pipe, the docking part comprises a main pipe and a branch pipe, one end of the main pipe is connected to the hose, the other end of the main pipe is connected to the docking needle, one end of the branch pipe is connected to the middle part of the main pipe, the branch pipe is connected to a filter element hose, and a water-sealed filter element is arranged in the filter element hose. The beneficial effect of the present invention is that due to the adoption of the above technical scheme, the interference of the air in the venous blood sample collection needle pipeline on the collected blood sample is reduced, the blood sample collection process is more reasonable, and the blood sample effectiveness is higher.

Description

Technical Field

[0001] The invention belongs to the field of medical instruments, in particular to a venous blood sample collection needle. Background Art

[0002] The collection of venous blood samples is an important and frequently performed project in medical activities. The current venous blood sample collection needles are mainly divided into straight and soft-connection types. The straight blood sample collection needle has no blank volume, and less blood is wasted during blood collection. After blood collection, the hematologist directly enters the blood collection tube and quickly contacts the reagents in the blood collection tube, effectively protecting the effective components of the blood, so the blood test results are more accurate. However, the disadvantage of the straight blood collection needle is that the operation is cumbersome. The double-headed collection needle needs to be screwed into the needle holder before blood collection, which increases the risk of blood collection infection. At the same time, after the needle pierces the blood vessel, the needle holder needs to be fixed with one hand while assisting the other hand to replace it. When multiple tubes of blood samples need to be taken, it is inevitable to push and pull the needle, causing the needle to move back and forth, puncturing the blood vessel to cause bleeding, and causing subcutaneous congestion. In addition, there is a risk of backflow after the straight blood sample collection needle is inserted into the blood vessel.

[0003] After the needle of the soft-connected blood collection needle punctures the skin, the operator can free up both hands to replace the blood collection tube. The hose at the tail of the blood collection needle is like a buffer zone to avoid pulling the needle when replacing the blood collection tube, so it is not easy to cause subcutaneous congestion. However, since the rear end of the blood collection needle is closed when soft-connected, after puncturing the skin, good blood return cannot be seen, and the blood cannot fill the entire hose, resulting in a 0.4-0.5ml volume blank in the entire hose. After inserting the pinhole blood collection tube, the volume of blood collected by the first blood collection tube will be reduced by 0.4-0.5ml, resulting in a certain degree of insufficient blood collection. In addition, when collecting blood, the blood is in contact with the air for too long, which may cause changes in the effective components of the blood and cause differences in the test results. Summary of the invention

[0004] The purpose of the present invention is to provide a new type of blood collection needle, which combines the advantages of soft-connection blood collection needles and avoids the influence of air in the hose on the blood collection effect.

[0005] The technical solution of the present invention is: a venous blood sample collection needle, including a venous puncture part and a docking part, the venous puncture part and the docking part are connected by a hose, one end of the venous puncture part is connected to the venous puncture needle, and the other end of the venous puncture part is connected to the hose, the docking part is a three-way tube, the docking part includes a main pipe and a branch pipe, one end of the main pipe is connected to the hose, the other end of the main pipe is connected to the docking needle, one end of the branch pipe is connected to the middle part of the main pipe, the branch pipe is connected to a filter element hose, and a water-sealed filter element is arranged in the filter element hose. For a traditional soft-connection collection needle, when the venous puncture needle is inserted into a blood vessel, without inserting a blood collection tube, the blood is not easy to flow into the hose due to the closure of the entire pipeline of the collection needle. After the venous puncture end of the venous blood sample collection needle of the present invention pierces the blood vessel, since a branch tube for ventilation is provided at the docking portion, the air in the pipeline of the venous blood sample collection needle can be discharged outwardly through the branch tube. Under the action of venous pressure and gravity, blood can fill the entire pipeline of the venous blood sample collection needle. When the blood contacts the water-sealed filter element in the filter element hose, the water-sealed filter element takes effect, sealing the filter element hose, and the pipeline of the venous blood sample collection needle forms a closed pipeline.

[0006] The water-sealed filter element is cylindrical, and the outer diameter of the water-sealed filter element matches the inner diameter of the filter element hose. The water-sealed filter element seals the inner channel of the filter element after contacting water, and does not work on the gap between the filter element and the pipe sleeved outside it. Therefore, the present invention adopts a hose sleeved outside the filter element, and the shape of the filter element is set to be cylindrical to match the inner shape of the hose, and the diameter of the filter element is interference fit with the inner diameter of the hose.

[0007] The ratio of the length to the diameter of the water-sealed filter element is 1:1-5:2. The length setting of the water-sealed filter element further ensures the sealing property of the connection between the water-sealed filter element and the filter element hose.

[0008] The ratio of the distance between the water-sealed filter element and the end of the branch tube away from the main tube to the length of the water-sealed filter element is 1:1-2:1. There is a certain distance between the water-sealed filter element and the branch tube, and the distance setting allows the operator to understand the position of the blood in the docking part through the transparent filter element hose. At the same time, the distance should not be too large. If it is too large, when the blood collection tube is connected, the pressure in the pipeline becomes smaller, the filter element hose shrinks, and the blood in the branch tube that has been exposed to more air flows back into the main tube and then enters the blood collection tube, causing interference to the collected blood sample.

[0009] An end of the branch pipe away from the main pipe is provided with an anti-slip thread.

[0010] The advantages and positive effects of the present invention are: due to the adoption of the above technical solution, the interference of the air in the venous blood sample collection needle pipeline on the collected blood sample is reduced, the blood sample collection process is more reasonable, and the blood sample validity is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the docking portion of the present invention

[0012] In the figure:

[0013] 1. Main pipe 2. Branch pipe 3. Filter element hose

[0014] 4. Close the filter element when exposed to water DETAILED DESCRIPTION

[0015] like Figure 1 As shown, a venous blood sample collection needle of the present invention comprises a venous puncture part and a docking part, the venous puncture part and the docking part are connected by a hose, one end of the venous puncture part is connected to the venous puncture needle, and the other end of the venous puncture part is connected to the hose, the docking part is a three-way pipe, the docking part comprises a main pipe 1 and a branch pipe 2, one end of the main pipe 1 is connected to the hose, the other end of the main pipe 1 is connected to the docking needle, one end of the branch pipe 2 is connected to the middle part of the main pipe 1, the branch pipe 2 is connected to a filter element hose 3, and a water-sealed filter element 4 is arranged in the filter element hose 3.

[0016] The water-sealed filter element 4 is cylindrical, and the diameter of the water-sealed filter element 4 is 2 mm.

[0017] The length of the water-sealed filter element 4 is 2.5-4.5 mm.

[0018] The distance between the water-sealed filter element 4 and the end of the branch pipe 2 away from the main pipe 1 is 5 mm.

[0019] The end of the branch pipe 2 away from the main pipe 1 is provided with an anti-slip thread.

[0020] The water-sealed filter element 4 is installed in the filter element hose 3 , and then the filter element hose 3 is connected to the branch pipe 1 .

[0021] The working process of this example is as follows: after the venous puncture part is inserted into the vein, the blood fills the entire venous blood sample collection needle, and after blood is seen at the filter element hose 1 in front of the water-sealed filter element 4, the blood sample can be collected.

[0022] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A venous blood sample collection needle, comprising a venous puncture part and a docking part, wherein the venous puncture part and the docking part are connected by a hose, wherein one end of the venous puncture part is connected to the venous puncture needle, and the other end of the venous puncture part is connected to the hose, characterized in that: The docking part is a three-way pipe, and the docking part includes a main pipe and a branch pipe. One end of the main pipe is connected to a hose, and the other end of the main pipe is connected to a docking needle. One end of the branch pipe is connected to the middle part of the main pipe. The branch pipe is connected to a filter element hose. A water-sealed filter element is arranged in the filter element hose. The water-sealed filter element is cylindrical. The outer diameter of the water-sealed filter element matches the inner diameter of the filter element hose. The ratio of the length to the diameter of the water-sealed filter element is 1:1-5:

2. The ratio of the distance from the water-sealed filter element to the end of the branch pipe away from the main pipe to the length of the water-sealed filter element is 1:1-2:

1. A branch pipe for ventilation is arranged at the docking part. The air in the pipeline of the venous blood sample collection needle can be discharged outwardly through the branch pipe. Under the action of venous pressure and gravity, blood can fill the entire pipeline of the venous blood sample collection needle. When the blood contacts the water-sealed filter element in the filter element hose, the water-sealed filter element takes effect, closes the filter element hose, and the pipeline of the venous blood sample collection needle forms a closed pipeline.

2. The venous blood sampling needle according to claim 1, characterized in that: An end of the branch pipe away from the main pipe is provided with an anti-slip thread.

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