Negative pressure structure for emptying air in blood taking needle

Abstract

The negative pressure structure comprises a blood collecting needle, the blood collecting needle comprises a needle handle, a needle tube, a sleeve and a vacuum bag, the sleeve is made of flexible film materials, the needle tube is arranged in the sleeve, the needle tube and the sleeve are fixed to the end face of the needle handle, the vacuum bag is arranged at the end of the sleeve, the top of the vacuum bag seals a sleeve opening, and the vacuum bag is arranged in the sleeve. The tip of the needle tube can penetrate into the cavity of the vacuum bag. Air in the blood taking needle is emptied through the vacuum bag, so that an existing vacuum blood taking tube can be filled with 2 ml of blood, and waste caused by discarding of the first blood taking tube is not needed.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical instrument field, concretely is a negative pressure structure for emptying the air in blood taking needle. BACKGROUND

[0002] The split blood taking needle is a disposable blood taking needle commonly used in clinic, and is usually used in cooperation with a vacuum blood collection tube. The existing blood taking needle comprises a venipuncture needle and a blood collecting needle, and the tail end of the catheter of the venipuncture needle is provided with a needle seat for connecting the blood collecting needle.

[0003] During blood collection, the medical staff punctures the venipuncture needle into the skin of a patient, and then punctures the blood collecting needle into the sealing plug of the vacuum blood collection tube, so as to drain blood through vacuum negative pressure and collect the blood into the blood collection tube. Since there is air in the blood taking needle, the blood collection in the first blood collection tube is unqualified, and the medical staff usually discards the first vacuum blood collection tube, causing waste.

[0004] Therefore, how to design a negative pressure structure for emptying the air in the blood taking needle becomes an urgent problem to be solved in the field of medical instruments. SUMMARY

[0005] The utility model aims at providing a negative pressure structure for emptying the air in the blood taking needle, which empties the air in the blood taking needle through a vacuum bag, so that 2ml of blood can be collected in the existing vacuum blood collection tube, and the first blood collection tube does not need to be discarded, thereby avoiding waste.

[0006] In order to achieve the above-mentioned purposes, the utility model adopts the following technical scheme:

[0007] A negative pressure structure for emptying the air in a blood taking needle, comprising a blood collecting needle, the blood collecting needle comprising a needle handle, a needle tube, a sleeve and a vacuum bag, the sleeve being made of flexible film material, the needle tube being arranged in the sleeve, and the needle tube and the sleeve being fixed to the end face of the needle handle, the vacuum bag being arranged at the end of the sleeve, the top of the vacuum bag being closed to the tube opening of the sleeve, the sharp end of the needle tube being puncturable into the cavity of the vacuum bag, and blood being drained through vacuum negative pressure, so that the air in the blood taking needle is emptied.

[0008] Compared with the prior art, the negative pressure structure for emptying the air in the blood taking needle, which adopts the above-mentioned technical scheme, has the following beneficial effects:

[0009] The negative pressure structure for emptying the air in the blood taking needle of the utility model, when taking blood, the medical staff pulls the sleeve, drives the needle tube tip to punch the vacuum bag top, until punctures into the vacuum bag cavity, about 0.5ml blood is drained through the vacuum negative pressure; then the needle handle is held to aim the bag bottom to the existing vacuum blood collection tube sealing plug, and the needle tube tip is punctured into the existing vacuum blood collection tube, so that the blood is collected into the existing vacuum blood collection tube. The air in the blood taking needle is emptied through the vacuum bag, so that 2ml blood can be collected in the existing vacuum blood collection tube, and the first blood collection tube does not need to be discarded, thereby saving.

[0010] Preferably, the sleeve is provided with a plurality of fold lines, the fold lines are arranged around the sleeve, and the plurality of fold lines are arranged along the length direction of the sleeve. The sleeve can be folded to shorten the length, so that the needle tube tip is punctured into the vacuum bag cavity. The sleeve is more easily pulled through the creases, so that the needle tube tip is punctured into the vacuum bag.

[0011] Preferably, the sleeve is provided with a spring, the spring is spirally arranged around the outer periphery of the needle tube, the spring is fixed to the end face of the needle handle, and the extension direction of the spring is the same as the length direction of the needle tube. When the sleeve is folded, the spring is compressed, and when the sleeve is unfolded, the spring is reset. The spring supports the sleeve, maintains the distance between the needle tube tip and the vacuum bag top, and prevents the needle tube tip from accidentally puncturing the vacuum bag.

[0012] Preferably, the vacuum bag top is made of thick rubber material. The vacuum bag top is relatively thick, which prevents the needle tube tip from accidentally puncturing the vacuum bag.

[0013] Preferably, the vacuum bag top is concave inward. The concave top of the bag positions the spring, and ensures that the needle tube tip punctures into the cavity through the top.

[0014] Preferably, the vacuum bag bottom is made of thin rubber material. The vacuum bag bottom is relatively thin, so that the needle tube is more easily punctured from the bag bottom.

[0015] Preferably, the vacuum bag cavity capacity is not less than 0.5ml. The needle bag cavity is sufficient to accommodate 0.5ml of blood.

[0016] Preferably, the distance between the vacuum bag top and the bag bottom is 3cm. The distance between the top and the bottom of the bag is 3cm, which is preferable. When the needle tube tip is punctured into the cavity, there is a distance between the top and the bottom, which is not easy to accidentally puncture the bottom. When the needle tube tip is punctured into the existing vacuum blood collection tube, the distance between the top and the bottom is short, which is not easy to be punctured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is a structure schematic view of the blood taking needle in the embodiment.

[0018] Fig. 2 It is a structure schematic view of the blood collection needle in the embodiment.

[0019] Fig. 3 This is a schematic diagram of the internal structure of the blood collection needle when the needle is not punctured, as shown in the example.

[0020] Fig. 4 This is a schematic diagram of the internal structure of the blood collection needle when the needle is inserted into the cyst cavity in the embodiment.

[0021] Fig. 5 This is a schematic diagram of the internal structure of the blood collection needle when the needle punctures the cyst cavity in the embodiment.

[0022] Figure reference numerals: 1. Intravenous puncture needle; 11. Catheter; 12. Needle hub; 2. Blood collection needle; 21. Needle tube; 22. Needle handle; 23. Cannula; 24. Fold line; 25. Spring; 3. Vacuum capsule; 30. Capsule cavity; 31. Capsule top; 32. Capsule bottom. Detailed Implementation

[0023] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0024] like Figs. 1 to 5 The negative pressure structure shown is used to expel air from the blood collection needle, including a blood collection needle 2. The blood collection needle 2 includes a needle handle 22, a needle tube 21, a cannula 23, and a vacuum bag 3. The cannula 23 is made of a flexible thin film material. The needle tube 21 is located inside the cannula 23, and the needle tube 21 and the cannula 23 are fixed to the end face of the needle handle 22. The vacuum bag 3 is located at the end of the cannula 23. The top 31 of the vacuum bag 3 seals the opening of the cannula 23. The tip of the needle tube 21 can be punctured into the cavity 30 of the vacuum bag 3. Blood is drained through vacuum negative pressure, so that the air in the blood collection needle is expelled. During blood collection, medical staff pull the cannula 23, causing the tip of the needle 21 to pierce the top 31 of the vacuum bag 3 until it enters the cavity 30 of the vacuum bag 3, draining approximately 0.5 ml of blood through vacuum negative pressure. Then, holding the needle handle 22, the bottom 32 of the bag is aligned with the existing vacuum blood collection tube's sealing plug, and the tip of the needle 21 is inserted into the existing vacuum blood collection tube, allowing blood to be collected within it. The air inside the blood collection needle is then expelled through the vacuum bag 3, ensuring that the existing vacuum blood collection tube is filled with 2 ml of blood.

[0025] The cannula 23 has several fold lines 24 arranged around the cannula 23. The fold lines 24 are arranged along the length of the cannula 23, allowing the cannula 23 to be folded to shorten its length, so that the tip of the needle 21 can be inserted into the cavity 30 of the vacuum bag 3. The fold lines make it easier to lift the cannula 23, allowing the tip of the needle 21 to be inserted into the vacuum bag 3.

[0026] The sleeve 23 is provided with a spring 25, the spring 25 is helically wound on the outer periphery of the needle tube 21, the spring 25 is fixed to the end face of the needle handle 22, the extension direction of the spring 25 is the same as the length direction of the needle tube 21, when the sleeve 23 is folded, the spring 25 is compressed, when the sleeve 23 is unfolded, the spring 25 resets. The spring 25 supports the sleeve 23, maintains the distance between the tip of the needle tube 21 and the top 31 of the vacuum bag 3, and prevents the tip of the needle tube 21 from accidentally puncturing the vacuum bag 3.

[0027] The top 31 of the vacuum bag 3 is made of thick rubber material, the top 31 is relatively thick, which prevents the tip of the needle tube 21 from accidentally puncturing the vacuum bag 3. The top 31 of the vacuum bag 3 is inwardly recessed, which positions the spring 25 and ensures that the tip of the needle tube 21 punctures into the cavity 30 of the bag through the top 31. The bottom 32 of the vacuum bag 3 is made of thin rubber material, the bottom 32 is relatively thin, which makes the needle tube 21 more easily puncture out of the bottom 32.

[0028] The cavity 30 of the vacuum bag 3 has a capacity of not less than 0.5ml, which can accommodate 0.5ml of blood in the cavity 30 of the vacuum bag. The distance between the top 31 and the bottom 32 of the vacuum bag 3 is 3cm, when the tip of the needle tube 21 punctures into the cavity 30, there is a distance between the top 31 and the bottom 32, which is not easy to accidentally puncture the bottom 32, when the tip of the needle tube 21 punctures into the existing vacuum blood collection tube, the distance between the top 31 and the bottom 32 is short, which is not easy to be punctured.

[0029] The above is only a preferred embodiment of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content without departing from the scope of the present application, and any equivalent embodiments with equivalent changes are equivalent to the above embodiments. Any modification, equivalent change and modification of the above embodiments, which does not depart from the technical solution of the present application, are still within the scope of the present application.

Claims

1. A negative pressure structure for evacuating air from within a blood collection needle, comprising: The blood collecting needle (2) comprises a needle handle (22), a needle tube (21), a sleeve (23) and a vacuum bag (3), the sleeve (23) is made of flexible film material, the needle tube (21) is arranged in the sleeve (23), and the needle tube (21) and the sleeve (23) are fixed to the end face of the needle handle (22), the vacuum bag (3) is arranged at the end of the sleeve (23), the top (31) of the vacuum bag (3) seals the pipe opening of the sleeve (23), the needle tube (21) can be punctured into the cavity (30) of the vacuum bag (3), and the blood is drained through the vacuum negative pressure to empty the air in the blood collecting needle.

2. The negative pressure structure for evacuating air from a lancing needle according to claim 1, wherein: The sleeve (23) is provided with a plurality of fold lines (24), the fold lines (24) are arranged around the sleeve (23), and the plurality of fold lines (24) are arranged along the length direction of the sleeve (23), so that the sleeve (23) can be folded and shortened in length, and the needle tube (21) can be punctured into the cavity (30) of the vacuum bag (3).

3. The negative pressure structure for evacuating air from a lancing needle according to claim 1, wherein: The sleeve (23) is provided with a spring (25), the spring (25) is spirally arranged on the outer periphery of the needle tube (21), the spring (25) is fixed to the end face of the needle handle (22), and the extension direction of the spring (25) is the same as the length direction of the needle tube (21).

4. The negative pressure structure for evacuating air from a lancing needle according to claim 1, wherein: The top (31) of the vacuum bag (3) is made of thick rubber material.

5. The negative pressure structure for evacuating air from a lancing needle according to claim 1, wherein: The top (31) of the vacuum bag (3) is concave inward.

6. The negative pressure structure for evacuating air from a lancing needle according to claim 1, wherein: The bottom (32) of the vacuum bag (3) is made of thin rubber material.

7. The negative pressure structure for evacuating air from a lancing needle according to claim 1, wherein: The capacity of the cavity (30) of the vacuum bag (3) is not less than 0.5ml.

8. The negative pressure structure for evacuating air from a lancing needle according to claim 1, wherein: The distance between the top (31) and the bottom (32) of the vacuum bag (3) is 3cm.

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