Auxiliary device for blood sampling of central venous catheter

Abstract

The utility model discloses a central venous catheter blood sampling auxiliary device which comprises an injector, a three-way valve, a communicating vessel, a handle, a first through tube, a second through tube, a third through tube and a fourth through tube, the second through tube is connected with the middle position of one side of the communicating vessel in a penetrating mode, and the third through tube is connected with the other side of the communicating vessel in a penetrating mode. The fourth through pipe penetrates through the inner wall of the handle to be communicated with the interior of the communicating vessel. According to the blood sampling device, a blood and liquid medicine mixture is extracted through the injector and stored in the liquid storage bag, then a needed blood sample is collected, and finally the blood and liquid medicine mixture in the liquid storage bag is pushed back into the body of a patient, closed sampling is conducted during blood sampling, hemolysis, blood sample pollution and the like are not prone to being caused, the blood sampling process is simple and convenient, and the blood sampling detection efficiency is improved; according to the medical nursing bed, the workload of workers is reduced, blood loss of a patient can be reduced, iatrogenic blood loss of the patient is prevented, meanwhile, the probability that nursing staff make contact with a blood sample is reduced, and cross infection is effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the field of blood collection auxiliary devices, and more specifically, relates to a central venous catheter blood collection auxiliary device. Background Technique

[0002] With the development of medium- and long-term intravenous infusion technology, central venous catheters, peripherally inserted central venous catheters, and totally implantable infusion ports have been widely used in the treatment of tumor chemotherapy, parenteral nutrition, the elderly, intensive care, and medium- and long-term intravenous infusion. However, due to the need for disease treatment, these patients often need to draw various blood specimens to dynamically monitor the changes in their conditions. Repeated blood drawing not only brings physical and mental pain to the patients, but also causes damage to the patients' blood vessels. Therefore, when collecting blood through a central venous catheter, an auxiliary device is often used to assist in blood collection, thereby reducing the pain caused to the patients.

[0003] Regarding the requirements for the nursing technical standard operating procedures for collecting blood samples through a central venous access device, they have become more strict and standardized. The 2021 Edition of the Standards of Practice for Infusion Therapy states that discard of waste blood or push-pull (mixing) method can be used to collect blood samples through a central venous access device. The following blood collection methods are the conventional methods currently used in most medical institutions.

[0004] Method 1: Discard blood method. The specific method is as follows: Before blood collection, the operator removes the central venous catheter connector (for patients undergoing infusion therapy, suspend infusion for 10 minutes without affecting the patient's condition), and uses an ethanol cotton piece to vigorously rub and disinfect the interface twice, 15 seconds each time. Use a 20 mL syringe to aspirate 6 mL of blood, separate the syringe from the central vascular access device tube, discard the 6 mL of blood aspirated, directly aspirate the required amount of blood sample from the patient without changing the syringe, remove the test tube cap, and slowly aspirate the blood in the syringe along the wall into the test tube to complete the blood collection operation. Finally, flush the vascular access device with 20 mL of 0.9% sodium chloride injection and replace the connector.

[0005] Method 2: Circulating aspiration method. The specific method is as follows: Before blood collection, the operator removes the central venous catheter connector (for patients undergoing infusion therapy, suspend infusion for 10 minutes without affecting the patient's condition), and uses an ethanol cotton piece to vigorously rub and disinfect the interface twice, 15 seconds each time. Use a 20 mL syringe to aspirate 10 mL of 0.9% sodium chloride injection to flush the central venous vascular access device, and then still use the same syringe to aspirate 10 mL of blood. Without separating the syringe and the end of the central vascular access device tube, push the 10 mL of blood aspirated back into the lumen. This is one cycle. Repeat 5 cycles, then directly aspirate the required amount of blood sample from the patient without changing the syringe, connect the blood collection needle, and use the negative pressure of the test tube to slowly aspirate the blood in the syringe along the wall into the test tube to complete the blood collection operation. Finally, flush the vascular access device with 20 mL of 0.9% sodium chloride injection and replace the connector.

[0006] However, there are certain problems in the traditional blood collection method during the blood collection process. For example, in the discard blood method, a syringe needs to be connected to the PICC for blood collection during the operation process. However, it is laborious to operate and requires multiple connections. In order to prevent blood specimen coagulation, the operation needs to be carried out quickly. When the blood specimen is injected from the syringe into the blood collection tube, it is easy to cause mechanical damage to blood cells due to excessive force by the operator, resulting in hemolysis. It is not easy to control the amount during blood distribution, which is likely to cause too much or too little blood collection. In addition, due to open operation, blood may be contaminated by air and droplets. During the operation of the cyclic aspiration method, although the open operation is avoided and the blood contamination caused by air and droplets is avoided, when the blood is cyclically drawn and pushed back, it is easy to cause mechanical damage to blood cells, resulting in hemolysis, and it is time-consuming and laborious. Therefore, this design proposal provides a central venous catheter blood collection assistance device. Utility Model Content

[0007] In view of the above defects or improvement requirements of the prior art, the present utility model provides a central venous catheter blood collection assistance device, thereby solving the technical problem of blood contamination caused by open operation in the prior art.

[0008] To achieve the above object, according to one aspect of the present utility model, there is provided a central venous catheter blood collection assistance device, including a syringe, a three-way valve, a connector, a handle, a first connecting tube, a second connecting tube, a third connecting tube, and a fourth connecting tube. The characteristics are as follows: The three-way valve is installed at the middle position on the top of the connector. The handle is installed on the top of the three-way valve, and the three-way valve can be rotated by the handle. The first connecting tube is inserted and connected to one side of the connector. The second connecting tube is inserted and connected to the middle position on one side of the connector. The third connecting tube is inserted and connected to the other side of the connector. The fourth connecting tube is installed on one side of the connector and is internally connected to the connector. One end of the syringe is inserted and connected to the inner wall of one end of the fourth connecting tube.

[0009] Preferably, a connecting tube is fixedly provided at one end of the first connecting tube. A locking ring is sleeved on the outer wall of one end of the first connecting tube, and the inner wall of the locking ring is threadedly connected to the outer wall of one end of the first connecting tube.

[0010] Preferably, a blood collection needle is inserted through one end of the third connecting tube. A protective cover is sleeved on one end of the third connecting tube, and the outer wall of the blood collection needle is inserted and connected to the inner wall of the protective cover.

[0011] Preferably, a protective cap is sleeved on one end of the first connecting tube, and the outer wall of the connecting tube is inserted and connected to the inner wall of the protective cap.

[0012] Preferably, a hose is inserted through one end of the second connecting tube. An aircraft clip is sleeved on the outer wall of one end of the hose, and the other end of the hose is connected to a liquid storage bag.

[0013] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0014] The utility model proposes a central venous catheter blood sampling auxiliary device, which enables blood sampling to be carried out in a closed structure by arranging a three-way valve, a connecting vessel, a first through tube, a second through tube, a third through tube and a fourth through tube. The utility model has a novel structure and an ingenious conception. It can be connected to the patient's central venous catheter at one time, and can avoid the process of first extracting part of the blood through a syringe and discarding it, and then collecting the required blood sample during blood sampling. The closed sampling during blood sampling is not easy to cause hemolysis, blood sample contamination, etc. The blood sampling process is simple and convenient, and the efficiency of blood sampling and testing is improved, which reduces the workload of the staff and can also reduce the loss of blood of the patient, preventing the patient's iatrogenic blood loss. At the same time, the nursing staff has less contact opportunities with the blood sample, and effectively avoids cross infection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the central venous catheter blood sampling auxiliary device of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the communication between the connecting device and multiple through tubes in the central venous catheter blood sampling auxiliary device of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure inside the third through tube in the central venous catheter blood sampling auxiliary device of the utility model;

[0018] Figure 4 It is a schematic diagram of the structure inside the first through tube in the central venous catheter blood sampling auxiliary device of the utility model.

[0019] In all the drawings, the same reference numerals are used to represent the same elements or structures, among which: 1-syringe; 2-three-way valve; 3-connecting vessel; 4-handle; 5-first through tube; 6-second through tube; 7-third through tube; 8-fourth through tube; 9-connecting tube; 10-locking ring; 11-blood collection needle; 12-protective cover; 13-protective cap; 14-aircraft clamp; 15-hose; 16-liquid storage bag. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0021] The utility model providesFigures 1-4 A central venous catheter blood sampling auxiliary device shown in the figure includes a syringe 1, a three-way valve 2, a connector 3, a handle 4, a first connecting tube 5, a second connecting tube 6, a third connecting tube 7, and a fourth connecting tube 8. Its characteristics are as follows: The three-way valve 2 is installed at the middle position on the top of the connector 3, the handle 4 is installed on the top of the three-way valve 2, and the three-way valve 2 can be rotated by the handle 4. The first connecting tube 5 is inserted and connected to the middle part on the other side of the connector 3, the second connecting tube 6 is inserted and connected to the middle position on one side of the connector 3, the third connecting tube 7 is inserted and connected to the other side of the connector 3, the fourth connecting tube 8 is installed on one side of the connector 3 and is internally connected to the connector 3. One end of the syringe 1 is inserted and connected to the inner wall of one end of the fourth connecting tube 8. Moreover, the first connecting tube 5, the second connecting tube 6, the third connecting tube 7, and the fourth connecting tube 8 are all internally connected to the connector 3. The three-way valve 2 rotates inside the connector 3 to connect different connecting tubes. And the fourth connecting tube 8 is always connected to the connector 3 through the three-way valve 2, and is opened and closed by turning the handle 4 on the three-way valve 2 to connect it to the connector 3. Thus, the syringe 1 is always connected to the connector 3. During the rotation of the three-way valve 2, different connecting tubes are connected to the syringe 1.

[0022] Furthermore, a connecting tube 9 is fixedly provided at one end of the first connecting tube 5. A locking ring 10 is sleeved on the outer wall of one end of the first connecting tube 5, and the inner wall of the locking ring 10 is threadedly connected to the outer wall of one end of the first connecting tube 5. The locking ring 10 is threadedly connected to the outer wall of one end of the first connecting tube 5, and after it is threadedly clamped with the threaded end of the central venous catheter, the blood sampling device can be connected to the central venous catheter.

[0023] Furthermore, a blood sampling needle 11 is inserted through one end of the third connecting tube 7. A protective cover 12 is sleeved on one end of the third connecting tube 7, and a rubber sleeve is provided outside the blood sampling needle 11. When not in use, the needle is wrapped in the rubber sleeve for sealed storage. When in use, the protective cover 12 is removed, and the rubber sleeve is squeezed to pierce it to expose the needle for blood sampling. After use, the protective cover 12 is used to cover it again to prevent bacteria from entering.

[0024] Furthermore, a protective cap 13 is sleeved on one end of the first connecting tube 5, and the outer wall of the connecting tube 9 is inserted and connected to the inner wall of the protective cap 13. When not in use, the connecting tube 9 is sealed and protected by the protective cap 13.

[0025] Furthermore, a flexible tube 15 is inserted through one end of the second connecting tube 6. An aircraft clip 14 is sleeved on the outer wall of one end of the flexible tube 15. One end of the flexible tube 15 is connected to a liquid storage bag 16. When the three-way valve 2 rotates, the connecting tubes at the right-angle ends are simultaneously closed and connected. And when the three-way valve 2 connects the second connecting tube 6 and the third connecting tube 7 at the right-angle ends to the syringe 1, the opening of the liquid storage bag 16 is controlled by turning the aircraft clip 14.

[0026] Working principle: When using the central venous catheter blood sampling auxiliary device in this design, first, as usual, the operator removes the central venous catheter connector before blood collection, rubs the interface vigorously with an ethanol cotton pad twice to disinfect it, then removes the protective cap 13 at one end of the first through-tube 5 to connect the connecting tube 9 to the central venous catheter, and twists the locking ring 10 to make it threadedly connected to the end of the central venous catheter, and then fixes the blood sampling device to the central venous catheter, then close the airplane clamp 14, rotate the three-way valve 2 to connect the first through-tube 5 with the fourth through-tube 8, at this time the syringe 1 is connected to the central venous catheter, the second through-tube 6 and the third through-tube 7 at the two right-angle ends are closed, and an appropriate amount of blood and liquid medicine mixture is aspirated, and the three-way valve 2 is rotated again to make the syringe 1 the same as the right-angle end, open the airplane clamp 14, and push the syringe 1 to collect blood The liquid-drug mixture is injected into the liquid storage bag 16 through the hose 15. After the injection, the airplane clamp 14 is closed, the two right-angle ends of the tubes are closed, and the three-way valve 2 is rotated at the same time to connect the syringe 1 with the central venous catheter on the opposite side, and suction is performed again. At this time, pure blood is sucked. After it is sucked into the syringe 1, the three-way valve 2 is rotated to open the third tube 7 at the right-angle end, and the protective cover 12 is pulled out to expose the blood collection needle 11, which is inserted into the test tube and the syringe 1 is pushed to inject the extracted blood into the test tube for collection. The three-way valve 2 is rotated again to open the second tube 6, and the airplane clamp 14 is opened to draw the blood and liquid medicine in the liquid storage bag 16 into the syringe 1. The three-way valve 2 is rotated again, and the airplane clamp 14 is closed to connect the syringe 1 with the central venous catheter on the opposite side again, and the blood and liquid medicine are pushed into it to complete the overall blood collection operation. This method has two major advantages: ① The patient's central venous catheter is connected once during the entire process, which can avoid the process of first extracting part of the blood through a syringe and discarding it, and then collecting the required blood sample. The closed sampling during blood collection is not easy to cause hemolysis, blood sample contamination, etc. The blood collection process is simple and convenient, which improves the efficiency of blood collection and testing and reduces the workload of the staff; ② The blood and liquid medicine mixture is extracted by the syringe 1 and stored in the liquid storage bag 16, and then the required blood sample is collected, and finally the blood and liquid medicine mixture in the liquid storage bag is pushed back into the patient's body. This process can reduce the loss of blood from the patient and prevent iatrogenic blood loss of the patient. At the same time, the nursing staff has less contact with the blood sample, effectively avoiding cross infection.

[0027] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. An auxiliary device for collecting blood from a central venous catheter, comprising a syringe (1), a three-way valve (2), a communicating vessel (3), a handle (4), a first connecting tube (5), a second connecting tube (6), a third connecting tube (7), and a fourth connecting tube (8), characterized in that: The three-way valve (2) is installed at the middle position on the top of the connector (3). The handle (4) is installed on the top of the three-way valve (2), and the three-way valve (2) can be turned by the handle (4). The first connecting pipe (5) is inserted and connected to one side of the connector (3). The second connecting pipe (6) is inserted and connected to the middle position on one side of the connector (3). The third connecting pipe (7) is inserted and connected to the other side of the connector (3). The fourth connecting pipe (8) is installed on one side of the connector (3) and is internally connected to the connector (3). One end of the syringe (1) is inserted and connected to the inner wall of one end of the fourth connecting pipe (8).

2. The central venous catheter blood sampling assistance device according to claim 1, characterized in that, A connecting pipe (9) is fixedly provided at one end of the first connecting pipe (5). A locking ring (10) is sleeved on the outer wall of one end of the first connecting pipe (5), and the inner wall of the locking ring (10) is threadedly connected to the outer wall of one end of the first connecting pipe (5).

3. The auxiliary device for collecting blood from a central venous catheter according to claim 1, characterized in that A blood collection needle (11) is inserted through one end of the third connecting pipe (7). A protective cover (12) is sleeved on one end of the third connecting pipe (7), and the outer wall of the blood collection needle (11) is inserted and connected to the inner wall of the protective cover (12).

4. The central venous catheter blood sampling assistance device according to claim 1, wherein A protective cap (13) is sleeved on one end of the first connecting pipe (5), and the outer wall of the connecting pipe (9) is inserted and connected to the inner wall of the protective cap (13).

5. The central venous catheter blood sampling assistance device according to claim 1, characterized in that, A flexible pipe (15) is inserted through one end of the second connecting pipe (6). An aircraft clip (14) is sleeved on the outer wall of one end of the flexible pipe (15), and the other end of the flexible pipe (15) is connected to a liquid storage bag (16).

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