A negative pressure blood collection needle specifically for central venous catheters

Abstract

This utility model relates to the field of medical device technology and proposes a negative pressure blood collection needle for central venous catheters, including a blood collection needle tube and a central venous catheter: a fixing block is fixedly connected to the bottom of the blood collection needle tube, an internally threaded connecting tube is fixedly connected to the bottom of the fixing block, an externally threaded cylinder is connected to the internal thread of the internally threaded connecting tube, a negative pressure elastic device is fixedly connected to the bottom of the externally threaded cylinder, a negative pressure pipe is fixedly connected to the bottom of the negative pressure elastic device, a catheter connector is provided at the top of the central venous catheter, and a shunt tube one and a shunt tube two are fixedly connected to the top of the catheter connector. The negative pressure elastic device can generate negative pressure. When the negative pressure pipe is inserted into the blood collection connecting tube one, the blood in the central venous catheter is drawn out by the blood collection needle tip inserted into the blood collection connecting tube two.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to a negative pressure blood collection needle for central venous catheters. Background Technology

[0002] A blood collection needle is an instrument used in medical testing to collect blood samples. It consists of a needle tip and a needle shaft. The needle tip is located at the head of the needle shaft, and a sheath is slidably connected to the needle shaft. A return spring is located between the sheath and the needle shaft, and the sheath is initially positioned at the head of the needle tip and needle shaft. Patients with hematological malignancies require frequent monitoring of blood parameters. When patients have fever or difficulty with peripheral vascular puncture, blood cultures or other blood samples must be drawn from a central venous catheter.

[0003] A search revealed that an existing patent (CN222091695U) discloses a blood collection needle with a negative pressure blood collection tube, comprising: a negative pressure tube, a push rod disposed on the negative pressure tube, a push plate fixedly connected to the lower surface of the push rod, the push plate being movably connected to the negative pressure tube, a negative pressure plate fixedly connected to the end of the push rod away from the push plate, a rubber sleeve fixedly connected to the upper surface of the negative pressure plate, a connector movably connected to the upper surface of the negative pressure tube, a flexible tube fixedly connected to the upper surface of the connector, the flexible tube being movably connected to the negative pressure tube, a fixing tube fixedly connected to the end of the flexible tube away from the connector, and a fixed surface of the fixing tube being fixedly connected to... A first connecting tube is equipped with an airbag. A one-way valve is fixedly connected to the end of the first connecting tube away from the fixed tube. A second connecting tube is fixedly connected to the side surface of the fixed tube. A hemostatic valve is fixedly connected to the end of the second connecting tube away from the fixed tube. Through the cooperation of the hemostatic valve, the airbag, and the one-way valve, the negative pressure state can be promptly released after blood collection, making the internal air pressure lower than the external air pressure, forming an internal and external pressure difference, so that blood will not flow back. Through the cooperation of the negative pressure tube, the push rod, and the negative pressure plate, the blood collection volume can be controlled by controlling the negative pressure difference, which has the effect of reducing pain and bleeding risk and improving blood collection efficiency.

[0004] However, in the above-mentioned scheme, the central venous catheter cannot be directly connected to the existing blood collection needle. Blood must be drawn from the central venous catheter using an empty needle and then injected into the blood test tube, which greatly increases the risk of hemolysis and coagulation, and also increases the risk of needlestick injuries and blood contamination for medical staff.

[0005] In view of this, this utility model proposes a negative pressure blood collection needle specifically for central venous catheters. Utility Model Content

[0006] This invention proposes a negative pressure blood collection needle specifically for central venous catheters, which solves the problem that in the current related technologies, central venous catheters cannot be directly connected to existing blood collection needles. Blood must be drawn from the central venous catheter using an empty needle and then injected into a blood test tube, which greatly increases the risk of hemolysis and coagulation, and also increases the risk of needlestick injuries and blood contamination for medical personnel.

[0007] The technical solution of this utility model is as follows: A negative pressure blood collection needle for a central venous catheter includes a blood collection needle tube and a central venous catheter: a fixing block is fixedly connected to the bottom of the blood collection needle tube, an internally threaded connecting tube is fixedly connected to the bottom of the fixing block, an externally threaded cylinder is connected to the internal thread of the internally threaded connecting tube, a negative pressure elastic device is fixedly connected to the bottom of the externally threaded cylinder, a negative pressure pipe is fixedly connected to the bottom of the negative pressure elastic device, and a catheter connector is provided at the top of the central venous catheter, with a [missing information - likely a device or component] fixedly connected to the top of the catheter connector. The system includes a shunt tube 1 and a shunt tube 2. The top of the shunt tube 2 is fixedly connected to a blood collection connecting tube 1. The negative pressure conduit is adapted to be inserted into the inside of the blood collection connecting tube 1. The top of the shunt tube 1 is fixedly connected to a blood collection connecting tube 2. The top of the blood collection needle includes a blood collection needle tip, which is adapted to be inserted into the inside of the blood collection connecting tube 2. A negative pressure is generated by a negative pressure elastic device. When the negative pressure conduit is inserted into the blood collection connecting tube 1, the blood in the central venous catheter is drawn out and then drawn by the blood collection needle tip inserted into the blood collection connecting tube 2.

[0008] Preferably, the bottom of the central venous catheter is fixedly connected to a blood collection end, and the central venous catheter and the blood collection end are lodged in a large vein. By connecting the blood collection needle to the central venous catheter, blood can be collected directly from the venous lodged tube.

[0009] Preferably, both sides of the blood collection connecting tube one and the blood collection connecting tube two are fixedly connected to handle two, and both sides of the catheter connector are fixedly connected to handle one.

[0010] Preferably, the thread of the internally threaded connecting pipe is located at the inner opening of the internally threaded connecting pipe, and the threaded surface of the externally threaded cylinder is located at the outer opening of the externally threaded cylinder.

[0011] Preferably, the first blood collection connecting tube, the second blood collection connecting tube, the first shunt tube, the catheter connector, the central venous catheter, and the blood collection end are connected in sequence.

[0012] Preferably, the blood collection needle tube includes a blood collection needle head, a blood collection needle tip, and a blood collection needle handle. The blood collection needle tube is fixed to the top of the fixing block, and a blood collection needle head is fixedly connected to the other end of the blood collection needle tube. A blood collection needle tip is provided at the end of the blood collection needle head, and a blood collection needle handle is fixedly connected to one side of the blood collection needle head.

[0013] Preferably, the blood collection needle and the needle tip are adapted to be inserted into the inside of the blood collection connecting tube.

[0014] Preferably, the blood collection needle tip, blood collection needle head, blood collection needle tube, fixing block, internal threaded connecting tube, external threaded cylinder, negative pressure elastic device and negative pressure pipeline are connected in sequence.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. In this utility model, the negative pressure elastic device can generate negative pressure. When the negative pressure pipe is inserted into the blood collection connecting tube one, the blood in the central venous catheter is drawn out by the blood collection needle tip inserted into the blood collection connecting tube two.

[0017] 2. In this utility model, by connecting the blood collection needle tube to the central venous catheter, blood can be collected directly from the venous indwelling tube. Attached Figure Description

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention viewed from one side from above;

[0020] Figure 2 This is a three-dimensional structural diagram of the present invention viewed from the top on the other side;

[0021] Figure 3 This is a three-dimensional structural diagram of the present invention viewed from one side, looking upwards.

[0022] Figure 4 This is a three-dimensional structural diagram of the present invention viewed from below from the other side;

[0023] Figure 5 This is a front view structural diagram of the present invention.

[0024] In the diagram: 1. Blood collection needle tube; 2. Fixing block; 3. Blood collection needle tip; 4. Blood collection needle tip; 5. Blood collection needle handle; 6. Internally threaded connecting tube; 7. Externally threaded cylinder; 8. Negative pressure elastic device; 9. Negative pressure pipeline; 10. Central venous catheter; 11. Blood collection end; 12. Catheter connector; 13. Handle 1; 14. Shunt 1; 15. Shunt 2; 16. Blood collection connecting tube 1; 17. Blood collection connecting tube 2; 18. Handle 2. Detailed Implementation

[0025] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0026] Example 1

[0027] A preferred embodiment of the negative pressure blood collection needle for central venous catheters provided by this utility model is as follows: Figures 1 to 5 As shown: A negative pressure blood collection needle for a central venous catheter includes a blood collection needle tube 1 and a central venous catheter 10. A fixing block 2 is fixedly connected to the bottom of the blood collection needle tube 1. An internally threaded connecting tube 6 is fixedly connected to the bottom of the fixing block 2. An externally threaded cylinder 7 is connected to the internal thread of the internally threaded connecting tube 6. A negative pressure elastic device 8 is fixedly connected to the bottom of the externally threaded cylinder 7. A negative pressure pipe 9 is fixedly connected to the bottom of the negative pressure elastic device 8. A catheter connector 12 is provided at the top of the central venous catheter 10. A shunt tube 14 and a shunt tube 2 15 are fixedly connected to the top of the catheter connector 12. A blood collection connecting tube 16 is fixedly connected to the top of the shunt tube 2 15. The negative pressure pipe 9 is adapted to be inserted into the inside of the blood collection connecting tube 16. A blood collection connecting tube 2 17 is fixedly connected to the top of the shunt tube 14. The top of the blood collection needle tube 1 includes a blood collection needle tip 4, which is adapted to be inserted into the inside of the blood collection connecting tube 2 17.

[0028] It should be noted that the existing blood collection needles still have certain shortcomings. Currently, central venous catheters cannot be directly connected to existing blood collection needles. Blood must be drawn from the central venous catheter using an empty needle and then injected into the blood test tube, which greatly increases the risk of hemolysis and coagulation, and also increases the risk of needlestick injuries and blood contamination for medical staff.

[0029] In this embodiment, negative pressure is generated by the negative pressure elastic device 8. When the negative pressure pipe 9 is inserted into the blood collection connecting tube 16, the blood in the central venous catheter 10 is drawn out by the blood collection needle tip 4 inserted into the blood collection connecting tube 2 17.

[0030] In a further preferred embodiment of the present invention, a blood collection end 11 is fixedly connected to the bottom of the central venous catheter 10, and the central venous catheter 10 and the blood collection end 11 are lodged in the large vein.

[0031] In this embodiment, by connecting the blood collection needle 1 to the central venous catheter 10, blood can be collected directly from the venous indwelling tube.

[0032] In a further preferred embodiment of the present invention, a handle 18 is fixedly connected to both sides of the blood collection connecting tube 16 and the blood collection connecting tube 17, and a handle 13 is fixedly connected to both sides of the catheter connector 12.

[0033] In a further preferred embodiment of this utility model, the thread of the internal threaded connecting pipe 6 is located at the inner opening of the internal threaded connecting pipe 6, and the threaded surface of the external threaded cylinder 7 is located at the outside of the external threaded cylinder 7.

[0034] Example 2

[0035] Based on Example 1, a preferred embodiment of the negative pressure blood collection needle for central venous catheters provided by this utility model is as follows: Figures 1 to 5 As shown: Blood collection connection tube 16, blood collection connection tube 2 17, shunt tube 14, catheter connector 12, central venous catheter 10 and blood collection end 11 are connected in sequence.

[0036] In a further preferred embodiment of the present invention, the blood collection needle tube 1 includes a blood collection needle head 3, a blood collection needle tip 4, and a blood collection needle handle 5. The blood collection needle tube 1 is fixed to the top of the fixing block 2. The other end of the blood collection needle tube 1 is fixedly connected to the blood collection needle head 3. The end of the blood collection needle head 3 is provided with a blood collection needle tip 4. The side of the blood collection needle head 3 is fixedly connected to the blood collection needle handle 5.

[0037] In a further preferred embodiment of the present invention, the blood collection needle 3 and the blood collection needle tip 4 are adapted to be inserted into the inside of the blood collection connecting tube 16.

[0038] In a further preferred embodiment of this utility model, the blood collection needle tip 4, the blood collection needle head 3, the blood collection needle tube 1, the fixing block 2, the internal threaded connecting tube 6, the external threaded cylinder 7, the negative pressure elastic device 8, and the negative pressure pipe 9 are connected in sequence.

[0039] The working principle of this utility model is as follows: The blood collection needle tube 1 is connected by an internally threaded connecting tube 6 and an externally threaded cylinder 7. The negative pressure end is connected to the shunt tube at the other end of the central venous catheter 10. The negative pressure elastic device 8 generates negative pressure for blood collection. When the blood collection needle tube 1 is separated, the flow is automatically stopped to avoid blood leakage, so as to achieve the purpose of blood collection needle tube 1 directly collecting blood from the central venous catheter 10 in a closed manner.

[0040] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A negative pressure blood collection needle specifically for central venous catheters, characterized in that, The system includes a blood collection needle (1) and a central venous catheter (10): a fixing block (2) is fixedly connected to the bottom of the blood collection needle (1), an internally threaded connecting tube (6) is fixedly connected to the bottom of the fixing block (2), an externally threaded cylinder (7) is connected to the internal thread of the internally threaded connecting tube (6), a negative pressure elastic device (8) is fixedly connected to the bottom of the externally threaded cylinder (7), a negative pressure pipe (9) is fixedly connected to the bottom of the negative pressure elastic device (8), and a catheter connector (1) is provided at the top of the central venous catheter (10). 2) The top of the catheter connector (12) is fixedly connected to a shunt tube one (14) and a shunt tube two (15). The top of the shunt tube two (15) is fixedly connected to a blood collection connecting tube one (16). The negative pressure pipe (9) is adapted to be inserted into the inside of the blood collection connecting tube one (16). The top of the shunt tube one (14) is fixedly connected to a blood collection connecting tube two (17). The top of the blood collection needle tube (1) includes a blood collection needle tip (4). The blood collection needle tip (4) is adapted to be inserted into the inside of the blood collection connecting tube two (17).

2. The negative pressure blood collection needle for central venous catheters according to claim 1, characterized in that, The central venous catheter (10) is fixedly connected to a blood collection end (11) at its bottom, and the central venous catheter (10) and the blood collection end (11) are lodged in a large vein.

3. The negative pressure blood collection needle for central venous catheters according to claim 1, characterized in that, Both sides of the blood collection connecting tube one (16) and the blood collection connecting tube two (17) are fixedly connected to handle two (18), and both sides of the catheter connector (12) are fixedly connected to handle one (13).

4. The negative pressure blood collection needle for central venous catheters according to claim 1, characterized in that, The thread of the internal threaded connecting pipe (6) is located inside the internal threaded connecting pipe (6), and the thread surface of the external threaded cylinder (7) is located outside the external threaded cylinder (7).

5. A negative pressure blood collection needle for central venous catheters according to claim 2, characterized in that, The blood collection connection tube one (16), blood collection connection tube two (17), shunt tube one (14), catheter connector (12), central venous catheter (10) and blood collection end (11) are connected in sequence.

6. A negative pressure blood collection needle for central venous catheters according to claim 1, characterized in that, The blood collection needle tube (1) includes a blood collection needle head (3), a blood collection needle tip (4), and a blood collection needle handle (5). The blood collection needle tube (1) is fixed to the top of the fixing block (2). The other end of the blood collection needle tube (1) is fixedly connected to the blood collection needle head (3). The end of the blood collection needle head (3) is provided with a blood collection needle tip (4). The side of the blood collection needle head (3) is fixedly connected to the blood collection needle handle (5).

7. A negative pressure blood collection needle for central venous catheters according to claim 6, characterized in that, The blood collection needle (3) and the blood collection needle tip (4) are adapted to be inserted into the inside of the blood collection connecting tube (16).

8. A negative pressure blood collection needle for central venous catheters according to claim 6, characterized in that, The blood collection needle tip (4), blood collection needle head (3), blood collection needle tube (1), fixing block (2), internal threaded connecting tube (6), external threaded cylinder (7), negative pressure elastic device (8) and negative pressure pipeline (9) are connected in sequence.

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