Blood sampling device

Abstract

The utility model discloses a blood sampling device which comprises a pressing valve assembly used for controlling circulation of a drainage tube and a guide sleeve used for guiding a connecting end to be connected with a blood sampling tube. The pressing valve assembly is arranged on the drainage tube and comprises a fixing sleeve and a pressing block, a round hole is formed in the side face of the pressing block, the drainage tube is sleeved with the pressing block through the round hole, and a flow stopping groove is formed above the round hole of the pressing block; and the guide sleeve is arranged at the connecting end. The inside of the drainage tube is controlled to be in a closed state, excessive blood cannot be brought out due to negative pressure in the tube when the blood collection tube is pulled out, and the blood is prevented from splashing; if blood needs to be collected for multiple times, after a new blood collection bottle is inserted into the connecting end, the pressing block is jacked upwards, the drainage tube conducts drainage again, and the drainage tube is controlled to be switched on and off conveniently; the guide sleeve capable of being detachably connected is arranged at the connecting end, the coaxiality of the connecting end and the blood collection tube is positioned through the guide sleeve, the accuracy of the angle and force of the connecting end penetrating into the blood collection tube is improved, and the situation that the blood collection tube leaks air is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of blood collection needles, and in particular to a blood collection device. Background Art

[0002] Blood collection refers to the process of medical staff collecting blood samples through veins or arteries for testing or related needs. Blood collection usually uses medical equipment such as blood collection needles and blood collection tubes.

[0003] During the blood collection process, when the amount of blood collected is sufficient, there is still negative pressure in the blood collection tube. When the connecting end of the blood collection needle is separated from the blood collection tube, the blood in the connecting end may be brought out by the negative pressure in the blood collection tube, causing blood to splash during separation; secondly, when blood is collected, the connecting end of the blood collection needle needs to be inserted into the blood collection tube, and the blood is drawn into the tube by the negative pressure in the blood collection tube. However, when the angle and force of the connecting end inserted into the blood collection tube deviate, the steel needle in the connecting end may pierce the rubber layer wrapping the steel needle, thereby causing a gap and air leakage at the connection between the connecting end and the blood collection tube, making it impossible to perform negative pressure blood drawing. When the negative pressure in the blood collection tube is insufficient, blood overflows from the end of the blood collection needle, causing contamination. Utility Model Content

[0004] The technical problem to be solved by the present application is to provide a blood collection device, which can basically ensure the angle of the connecting end of the blood collection needle inserted into the blood collection tube, so that the steel needle of the connecting end will not be separated from the rubber layer outside it due to deviations in angle and force, ensuring that the inside of the blood collection tube is in a negative pressure state when the connecting end and the blood collection tube are connected; secondly, the blood in the blood collection needle can be kept under pressure in the catheter of the blood collection needle to avoid splashing when the connecting end and the blood collection tube are separated.

[0005] In order to solve the above technical problems, this application adopts the following technical solutions:

[0006] The blood sampling device includes a push valve assembly for controlling the flow of a drainage tube and a guide sleeve for guiding the connection between a connecting end and a blood sampling tube; the push valve assembly is arranged on the drainage tube, and the push valve assembly includes a fixed sleeve, a through hole is provided on the side wall of the fixed sleeve, a pressure block is provided in the through hole, a circular hole is provided on the side of the pressure block, the pressure block is sleeved on the drainage tube through the circular hole, and a flow stop groove is provided above the circular hole of the pressure block; the guide sleeve is arranged at the connecting end. The push valve assembly can seal the drainage tube to prevent the blood in the tube from being drawn out by the negative pressure of the blood sampling tube, causing blood splashing when the connecting end and the blood sampling tube are separated. The blood sampling tube and the connecting end are basically coaxial through the guidance of the guide sleeve to prevent the steel needle from being separated from the rubber sleeve due to deviations in the angle and force of insertion.

[0007] In order to make the drainage tube shrink and deform when the pressing block is pressed downward, so as to achieve the effect of closing the drainage tube, according to the further development of the above scheme, the inner diameter of the flow-stopping groove is smaller than the inner diameter of the circular hole.

[0008] In some embodiments, the connecting end includes a steel needle cap connected to one end of the drainage tube, a steel needle is connected to the axis of the steel needle cap, a rubber sleeve is provided on the outside of the steel needle, a thread is provided on the outer wall of the steel needle cap, and the guide sleeve is connected to the steel needle cap.

[0009] The function of the guide sleeve is to guide the blood collection tube to be connected to the connecting end. According to the further development of the above scheme, the guide sleeve includes a cylinder, the top surface of the cylinder is convex, the top of the convexity is provided with a threaded hole connected to the steel needle cap, the bottom of the threaded hole is provided with a through hole for the rubber sleeve to pass through, and the bottom of the cylinder is open.

[0010] In order to facilitate the insertion of the blood collection tube into the guide sleeve, and to gradually become coaxial with the connecting end along the guide sleeve and finally be connected with the connecting end, the inner wall of the cylinder is narrowed from bottom to top.

[0011] In some embodiments, a blood collection needle is also included, which is connected to one end of the drainage tube away from the connecting end, and the pressing valve assembly is arranged at the connecting part of the blood collection needle and the drainage tube.

[0012] Compared with the prior art, the present application achieves at least the following beneficial effects: a press valve assembly is arranged on the drainage tube, and before the blood collection tube is pulled out, the pressure block is pressed downward, and the pressure block squeezes the drainage tube to deform, so that the inside of the drainage tube is closed. When the blood collection tube is pulled out, excess blood will not be brought out due to the negative pressure in the tube, thereby preventing blood from splashing; when the blood in the drainage tube is not circulating, the blood in the blood vessel will not flow out through the drainage tube. If blood needs to be collected multiple times, after a new blood collection bottle is inserted into the connecting end, the pressure block is pushed upward, and the drainage tube is not restricted by the pressure block, and the blood is drained again, making it convenient to control the on and off of the drainage tube; a detachable guide sleeve is provided at the connecting end, and the coaxiality of the connecting end and the blood collection tube is positioned by the guide sleeve, thereby improving the accuracy of the angle and force of the connecting end piercing the blood collection tube, thereby avoiding the situation where the steel needle at the connecting end separates from the side of the rubber sleeve, causing leakage of the blood collection tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] One or more embodiments of the present application will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0014] Figure 1 This is a three-dimensional schematic diagram of a blood sampling device according to one embodiment of the present application;

[0015] Figure 2 This is a front cross-sectional view of a blood collection device according to one embodiment of the present application;

[0016] Figure 3 for Figure 2 The local schematic diagram of the A in the middle;

[0017] Figure 4 A side view of the stop trough.

[0018] The numbers in the figure are: 1. blood collection needle; 2. pressing block; 2-1. stop groove; 3. fixing sleeve; 4. drainage tube; 5. connecting end; 5-1. steel needle cap; 5-2. steel needle; 5-3. rubber sleeve; 5-4. liquid outlet; 6. guide sleeve; 6-1. pick; 6-2. vertical groove; 6-3. flange; 6-4. protrusion; 7. blood collection tube. DETAILED DESCRIPTION

[0019] The present application will be described in detail below with reference to the exemplary embodiments in the accompanying drawings. However, it should be understood that the present application can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. These embodiments are provided here to make the disclosure of the present application more complete and to fully convey the concept of the present application to those skilled in the art.

[0020] In the description of the present application, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present application.

[0021] The inventors have conducted a careful analysis and found that the main reason for the above problems in the existing blood collection is that the current blood collection needle is usually only composed of a blood collection needle, a drainage tube and a connecting end with the blood collection tube, which is suitable for single blood collection. When multiple blood collections are performed, the blood in the drainage tube cannot be sealed. At the same time, there is a negative pressure inside the blood collection tube. When the connecting end and the blood collection tube are separated, the blood in the drainage tube is easy to spray out, causing blood splashing. Secondly, when blood is collected, the connecting end of the blood collection needle needs to be inserted into the blood collection tube. The connecting end is roughly a cone-shaped structure. When inserted into the blood collection tube, the blood in the drainage tube is easily sprayed out, causing blood splashing. The rubber sleeve and the rubber membrane of the blood collection tube generate friction to ensure the sealing inside the blood collection tube. However, when the angle of penetration into the blood collection tube is inclined and the penetration is fast, the friction generated by the rubber sleeve and the rubber membrane becomes larger, which may cause the steel needle at the connecting end to move, while the rubber sleeve does not move, causing the steel needle to pierce out from the side of the rubber sleeve. At this time, the blood collection tube is punctured and the negative pressure may slowly disappear, thus causing a gap between the connecting end and the blood collection tube to leak air and make it impossible to draw blood under negative pressure. When the negative pressure of the blood collection tube is insufficient, blood overflows from the blood collection needle end, causing pollution. Based on the above analysis, the inventor has improved the structure of the blood collection needle.

[0022] like Figure 1 As shown, in one embodiment of the blood sampling device of the present application, the device includes a push valve assembly for controlling the flow of the drainage tube 4 and a guide sleeve 6 for guiding the connection between the connecting end 5 and the blood sampling tube 7; the push valve assembly is arranged on the drainage tube 4, and the push valve assembly includes a cylindrical fixed sleeve 3, the side wall of the fixed sleeve 3 is provided with an upward through hole, a pressure block 2 is provided in the through hole, a circular hole is provided on the side of the pressure block 2, the pressure block 2 is sleeved on the drainage tube 4 through the circular hole, and a vertical stop groove 2-1 connected to the circular hole is provided above the circular hole of the pressure block 2; the guide sleeve 6 is detachably arranged at the connecting end 5. The pressing valve assembly can close or circulate the drainage tube 4. The specific operation is to press the pressing block 2 downward. When the pressing block 2 moves downward, the drainage tube 4 will enter the stop groove 2-1. The stop groove 2-1 forces the drainage tube 4 to deform, that is, the drainage tube 4 is in a pinched state, so that it is closed, and the blood in the drainage tube 4 is prevented from being carried out by the negative pressure of the blood sampling tube 7, causing blood splashing when the connecting end 5 and the blood sampling tube 7 are separated. Press the bottom of the block 2 upward, the pressing block 2 is reset, and the drainage tube 4 returns to the circular hole from the stop groove 2-1. The shape of the drainage tube 4 is basically restored, and the blood can flow in the drainage tube 4; the blood sampling tube 7 and the connecting end 5 are basically coaxial through the guidance of the guide sleeve 6, so as to prevent the steel needle 5-2 from being separated from the rubber sleeve 5-3 due to deviations in the piercing angle and force, and to avoid leakage of the blood sampling tube 7.

[0023] In order to make the drainage tube 4 shrink and deform when the pressing block 2 is pressed downward, so as to achieve the effect of closing the drainage tube 4, as shown in FIG. Figure 4As shown, the inner diameter of the stop groove 2-1 is smaller than the inner diameter of the circular hole, and the connection between the circular hole and the stop groove 2-1 is tapered (it can also be understood that the connection surface between the circular hole and the stop groove 2-1 has an arc), so that the pressing block 2 can move downward more smoothly without being interfered by the connection between the circular hole and the stop groove 2-1.

[0024] The function of the connecting end 5 is to pierce the blood collection tube 7 to collect the blood. Figure 2 and Figure 3 As shown, the connecting end 5 includes a steel needle cap 5-1 connected to one end of the drainage tube 4. The steel needle cap 5-1 is made of plastic and is an existing structure, which will not be further described here. A steel needle 5-2 that pierces the rubber membrane of the blood collection tube 7 is connected to the axis of the steel needle cap 5-1. The outside of the steel needle 5-2 is wrapped with a rubber sleeve 5-3. The outer wall of the steel needle cap 5-1 is provided with a thread, and the guide sleeve 6 and the steel needle cap 5-1 are threadedly connected.

[0025] The guide sleeve 6 is used to guide the blood collection tube 7 to be connected to the connecting end 5. The guide sleeve 6 comprises a cylinder, the top surface of which is sealed, and the top surface thereof is in the form of a protrusion 6-4, the top of which is provided with a threaded hole connected to the steel needle cap 5-1, the bottom of which is provided with a through hole for the rubber sleeve 5-3 to pass through, the bottom of which is open, and the blood collection tube 7 is inserted into the bottom of the cylinder and connected to the connecting end 5.

[0026] If the bottom of the cylinder of the guide sleeve 6 is equal to the diameter of the blood sampling tube 7, when inserting the blood sampling tube 7 into the cylinder, it is necessary to use two hands to hold the guide sleeve 6 and the blood sampling tube 7 respectively for alignment. If the diameter of the cylinder is larger than the blood sampling tube 7, it may be impossible to align the connecting end 5 and the blood sampling tube 7. In order to facilitate the insertion of the blood sampling tube 7 into the guide sleeve 6 and gradually become coaxial with the connecting end 5 along the guide sleeve 6 and finally connected to the connecting end 5, the inner wall of the cylinder is narrowed from bottom to top.

[0027] A flange 6-3 is provided at the bottom of the cylinder. The head of the blood collection tube 7 is inserted into the cylinder, and then the index finger and the middle finger respectively hold the flange 6-3, and the thumb presses the bottom of the blood collection tube 7. The blood collection tube 7 can be inserted into the guide sleeve 6 with one hand, and then the blood collection tube 7 is limited by the inner wall of the cylinder and gradually becomes coaxial with the connecting end 5.

[0028] The present embodiment also includes a blood collection needle 1 inserted into a human blood vessel, which is connected to one end of a drainage tube 4 away from a connecting end 5, and a pressing valve assembly is arranged at the connection between the blood collection needle 1 and the drainage tube 4. Compared with arranging the pressing valve assembly in the middle of the drainage tube 4, arranging the pressing valve assembly in the aforementioned position can ensure that it does not swing randomly with the drainage tube 4. At the same time, pressing the pressure block 2 can reduce shaking, and pressing is more conducive to applying force.

[0029] In addition, the current separation of the blood collection tube 7 and the connecting end 5 requires two hands. In order to facilitate the separation of the blood collection tube 7 and the connecting end 5 after blood collection, the following improvements are made to the structure of the guide sleeve 6. Two vertical grooves 6-2 are opened on the side wall of the cylinder of the guide sleeve 6. A paddle 6-1 is arranged in the vertical groove 6-2. The two ends of the paddle 6-1 are wider, and the part located in the vertical groove 6-2 is narrower. In this way, the paddle 6-1 is limited at both ends and will neither fall out nor sink in. Secondly, the shapes of the end faces of the paddle 6-1 and the cylinder are respectively adapted to the inner and outer walls of the cylinder, which can save space and prevent the paddle 6-1 from excessive tilting when moving up and down. In addition, Figure 3 As shown, a groove for placing a paddle 6-1 is also provided on the top surface of the cylinder. When the blood collection tube 7 is connected to the connecting end 5, the blood collection tube 7 will push the paddle 6-1 into the groove. When the blood collection tube 7 is separated from the connecting end 5, the index finger and the middle finger respectively hold the paddle 6-1, and the thumb presses the bottom of the flange 6-3 to press the paddle 6-1 downward, so that the paddle 6-1 moves downward to drive the blood collection tube 7 to be removed.

[0030] Usually, the direction of the liquid outlet of the connecting end 5 is vertically downward, so that the blood is directly guided and sprayed to the bottom of the blood collection tube 7. However, when the negative pressure of the blood collection tube 7 is large, the blood flow rate is too fast and directly rushes into the bottom of the blood collection tube 7. The anticoagulant cannot be mixed evenly during the blood collection process, and the blood can only be shaken after the blood collection is completed. This can easily cause blood collection failure. Therefore, the liquid outlet 5-4 of the rubber sleeve 5-3 at the end of the steel needle 5-2 is opened on the side, and the blood is sprayed from the side liquid outlet 5-4 to the wall of the blood collection tube 7, and then flows to the bottom of the blood collection tube 7. To a certain extent, the blood flow rate can be reduced.

[0031] When using the blood sampling device, the guide sleeve 6 is screwed into the connecting end 5, the needle holder holding the blood collection needle 1 is used to insert the needle into the blood vessel, and then the connecting end 5 is inserted into the blood collection tube 7 to collect blood. After the first tube of blood is collected, the pressing block 2 on the pressing valve assembly is pressed downward, and the stop groove 2-1 on the pressing block 2 clamps the drainage tube 4, causing the drainage tube 4 to deform and form a pinched state. The drainage tube 4 is closed and the blood inside cannot flow. Then, the blood collection tube 7 is separated from the connecting end 5 through the guide sleeve 6, and a new blood collection tube 7 is inserted. Then, the pressing block 2 is pressed upward, and the drainage tube 4 leaves the stop groove 2-1. The drainage tube 4 resumes its circulation function and a second blood sampling can be performed.

[0032] It should be understood that all the above embodiments are illustrative rather than restrictive, and various modifications or variations made by those skilled in the art to the specific embodiments described above based on the concept of the present application should all be within the protection scope of the present application.

Claims

1. A blood sampling device, characterized in that: It includes a push valve assembly for controlling the flow of the drainage tube and a guide sleeve for guiding the connection between the connecting end and the blood collection tube; the push valve assembly is arranged on the drainage tube, the push valve assembly includes a fixed sleeve, the side wall of the fixed sleeve is provided with a through hole, a pressure block is arranged in the through hole, a circular hole is arranged on the side of the pressure block, the pressure block is sleeved on the drainage tube through the circular hole, and a stop groove is arranged above the circular hole of the pressure block; the guide sleeve is arranged at the connecting end.

2. The blood sampling device according to claim 1, characterized in that: The inner diameter of the flow-stopping groove is smaller than the inner diameter of the circular hole.

3. The blood sampling device according to claim 1, characterized in that: The connecting end includes a steel needle cap connected to one end of the drainage tube, a steel needle is connected to the axis of the steel needle cap, a rubber sleeve is provided on the outside of the steel needle, a thread is provided on the outer wall of the steel needle cap, and the guide sleeve is connected to the steel needle cap.

4. The blood sampling device according to claim 3, characterized in that: The guide sleeve comprises a cylinder, the top surface of which is convex, a threaded hole connected to the steel needle cap is provided at the top of the convexity, a through hole for the rubber sleeve to pass through is provided at the bottom of the threaded hole, and the bottom of the cylinder is open.

5. The blood sampling device according to claim 4, characterized in that: The inner wall of the cylinder is narrowed from bottom to top.

6. The blood sampling device according to claim 5, characterized in that: The bottom of the cylinder is provided with a flange.

7. The blood sampling device according to claim 6, characterized in that: A vertical groove is formed on the side wall of the cylinder, and a paddle is arranged in the vertical groove.

8. The blood sampling device according to claim 7, characterized in that: A liquid outlet is provided on the side of the rubber sleeve at the end of the steel needle.

9. The blood sampling device according to claim 7, characterized in that: It also includes a blood collection needle, which is connected to one end of the drainage tube away from the connecting end, and the pressing valve assembly is arranged at the connecting part of the blood collection needle and the drainage tube.

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