Infusion blood sampling device

Abstract

The utility model provides a kind of infusion blood sampling device.In the utility model, after the central venous blood of critical patient is extracted using blood collector, the mixture in syringe is injected into the central vein of critical patient via central venous catheter, so that iatrogenic blood loss can be avoided.After blood sampling, new infusion bottle, new infusion tube and new pump do not need to be used, drug and instrument waste are avoided, and drug and instrument costs are reduced.When the infusion blood sampling device leaves factory, the nipple in the needle cylinder in the syringe is integrally formed with the first catheter and cannot be detached, so that the syringe is not pulled off from the first catheter, and the nipple in the needle cylinder in the syringe is always isolated from the outside and not exposed to the outside, so that external pollutants can be prevented from being injected into the central vein of critical patient, and health and safety threat to critical patient can be avoided.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an infusion blood collection device. Background Technology

[0002] Currently, there are many critically ill patients in the hospital's intensive care unit. For some of these critically ill patients, their blood pressure is too low and needs to be raised.

[0003] To raise the blood pressure of critically ill patients, vasopressors are needed, such as norepinephrine.

[0004] One method involves injecting norepinephrine into the veins of critically ill patients to raise their blood pressure. Utility Model Content

[0005] This utility model discloses an infusion blood collection device, comprising:

[0006] Four-way tube, syringe storage, connectors, and protective sleeve;

[0007] The four-way tubing includes: four conduits, a central lumen, and a four-way valve;

[0008] The four catheters are each connected to the central lumen;

[0009] The central cavity is used to house the four-way valve;

[0010] The side wall of the main body of the four-way valve is in contact with the side wall of the central inner cavity;

[0011] The four conduits are located on the same plane;

[0012] The angle between the first catheter and the second catheter is 90 degrees, the angle between the second catheter and the third catheter is 90 degrees, the angle between the third catheter and the fourth catheter is 90 degrees, and the angle between the fourth catheter and the first catheter is 90 degrees.

[0013] The body of the four-way valve has four through holes, which extend from the center of the body of the four-way valve to the side wall of the body of the four-way valve.

[0014] The four through holes are located on the same plane and are interconnected through the center of the four-way valve body;

[0015] The angle between the first through hole and the second through hole is greater than 30 degrees and less than 60 degrees, the angle between the second through hole and the third through hole is 90 degrees, and the angle between the first through hole and the fourth through hole is 180 degrees.

[0016] Along a direction perpendicular to the plane containing the four through holes, the main body of the four-way valve extends outward from the central inner cavity with a rotating handle.

[0017] The rotating handle is used to control the direction of the four through holes in the body of the four-way valve;

[0018] The first catheter is integrally and sealed with the nipple of the syringe barrel in the receiving syringe. When the infusion blood collection device leaves the factory, the first catheter and the nipple of the syringe barrel in the receiving syringe have formed an integral and sealed whole that cannot be disassembled.

[0019] One end of the connector is integrated with the outer wall of the second conduit, and the other end of the connector is integrated with the outer wall or end of the protective sleeve. The protective sleeve is used to fit over the second conduit to seal the second conduit so as to isolate the inside of the second conduit from the outside.

[0020] The third catheter is used to connect to the end of the central venous catheter;

[0021] The fourth catheter is used to connect one end of the infusion tube, and the other end of the infusion tube is used to connect the infusion bottle.

[0022] In one alternative implementation, the rotating handle is used to control whether the first conduit is connected to or not connected to the third conduit, or to control whether the second conduit is connected to or not connected to the third conduit, or to control whether the third conduit is connected to or not connected to the fourth conduit;

[0023] When the third and fourth catheters are connected, the first and second catheters are not connected, the first and third catheters are not connected, the first and fourth catheters are not connected, the second and third catheters are not connected, and the second and fourth catheters are not connected.

[0024] or,

[0025] When the first catheter and the third catheter are connected, the first catheter and the second catheter are not connected, the first catheter and the fourth catheter are not connected, the second catheter and the third catheter are not connected, the second catheter and the fourth catheter are not connected, and the third catheter and the fourth catheter are not connected.

[0026] or,

[0027] When the second catheter is connected to the third catheter, the first catheter is not connected to the second catheter, the first catheter is not connected to the third catheter, the first catheter is not connected to the fourth catheter, the second catheter is not connected to the fourth catheter, and the third catheter is not connected to the fourth catheter.

[0028] In one alternative implementation, the end of the rotary handle has four levers;

[0029] The four rotating rods are located on the same plane; the plane containing the four rotating rods is parallel to the plane containing the four through holes.

[0030] The direction of the first rotating rod is always the same as the direction of the first through hole, the direction of the second rotating rod is always the same as the direction of the second through hole, the direction of the third rotating rod is always the same as the direction of the third through hole, and the direction of the fourth rotating rod is always the same as the direction of the fourth through hole.

[0031] In one alternative implementation, the angle between the first through hole and the second through hole is 35 degrees, 40 degrees, 45 degrees, 50 degrees, or 55 degrees.

[0032] In one alternative implementation, the volume of the syringe is 6ml to 9ml.

[0033] In one alternative implementation, the inner diameters of the first through hole, the second through hole, the third through hole, and the fourth through hole are all 2 mm, 2.5 mm, or 3 mm.

[0034] In one alternative implementation, a strap is provided on the side wall of the syringe storage device to secure the syringe to the thigh of the human body.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] In this invention, before drawing blood using a blood collection device, a liquid is drawn using a syringe via a first and a third catheter. This liquid includes a mixture of sodium chloride from a central venous catheter and the central venous blood of a critically ill patient. Then, the blood collection device is used to draw the critically ill patient's central venous blood via a second, a third, and a central venous catheter. This ensures that the central venous blood drawn from the critically ill patient contains as little sodium chloride as possible, or even none at all. This improves the purity of the central venous blood drawn from the critically ill patient, avoids dilution by sodium chloride, prevents subsequent interference with the test results of the central venous blood drawn from the critically ill patient, and improves the accuracy of the test results.

[0037] In addition, this invention supports injecting the mixture in the syringe into the central vein of critically ill patients after drawing central venous blood using a blood collection device, via a central venous catheter, thus avoiding iatrogenic blood loss.

[0038] Furthermore, after blood collection, there is no need to use new infusion bottles, new infusion tubing, or new pumps, thus avoiding waste of drugs and equipment and reducing drug and equipment costs.

[0039] Secondly, when the infusion blood collection device leaves the factory, the first catheter and the nipple in the syringe barrel of the receiving syringe are already formed as a single sealed unit and cannot be disassembled. Thus, during the process of drawing the mixture using the receiving syringe before drawing central venous blood from a critically ill patient using the blood collection device, and during the process of injecting the mixture into the central venous vein of a critically ill patient via central venous catheterization after drawing central venous blood from a critically ill patient using the blood collection device, the receiving syringe is not removed from the first catheter. The nipple of the syringe barrel is always isolated from the outside and not exposed, thus preventing external contamination of the syringe barrel nipple. Similarly, the first catheter is always isolated from the outside and not exposed, preventing external contaminants from being injected into the central venous vein of a critically ill patient, thereby avoiding any health and safety threats to the critically ill patient. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of an infusion blood collection device according to the present invention.

[0041] Figure 2 This is a schematic diagram of the four conduits and the central cavity in a four-way tube according to this utility model.

[0042] Figure 3 This is a schematic diagram of the main body of a four-way valve according to this utility model.

[0043] Figure 4 This is a schematic diagram of a central cavity and a four-way valve superimposed according to this utility model.

[0044] Figure 5 This is a schematic diagram showing the four through holes in the main body of a four-way valve of this utility model superimposed with a rotating handle.

[0045] Figure 6 This is a schematic diagram of an infusion blood collection device according to the present invention.

[0046] Figure 7 This is a schematic diagram showing the four through holes in the main body of a four-way valve of this utility model superimposed with a rotating handle.

[0047] Figure 8 This is a schematic diagram of an infusion blood collection device according to the present invention.

[0048] Figure 9 This is a schematic diagram showing the four through holes in the main body of a four-way valve of this utility model superimposed with a rotating handle. Detailed Implementation

[0049] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] In one approach, norepinephrine can be infused into the peripheral veins of critically ill patients. However, the inventors discovered that the mechanism of norepinephrine is to constrict blood vessels and increase vascular tone. However, peripheral veins have small pores and low blood flow. Therefore, infusing norepinephrine into the peripheral veins of critically ill patients can easily lead to peripheral vein necrosis.

[0051] Furthermore, the inventors discovered that the central veins in the human body have large diameters and large blood flow, making it less likely for norepinephrine to cause necrosis of the central veins.

[0052] Thus, in another approach, norepinephrine can be infused into the central venous vessels of critically ill patients to raise their blood pressure.

[0053] However, norepinephrine has a strong effect on raising blood pressure. To avoid excessively raising the blood pressure of critically ill patients, the amount of norepinephrine administered into the central venous vessels of critically ill patients should not be excessive.

[0054] For example, in critically ill patients, the amount of norepinephrine infused into their central venous vessels over 1-2 hours is usually less than 1 ml.

[0055] In addition, in clinical practice, if it is necessary to raise the blood pressure of critically ill patients, norepinephrine needs to be continuously infused into their central venous vessels. For example, norepinephrine may be continuously infused into the central venous vessels of critically ill patients over 24, 48, 72, or 96 hours. That is, the amount of norepinephrine infused into the central venous vessels of critically ill patients every 1-2 hours is usually less than 1 ml, and it is slowly and evenly infused over 1-2 hours, not instantaneously.

[0056] For example, assuming that the amount of norepinephrine to be infused into the central vein of a critically ill patient within 1 hour is 0.6 ml, then the average amount of norepinephrine to be infused into the central vein of a critically ill patient per minute within 1 hour is 0.01 ml (0.6 ml divided by 60). Secondly, the average amount of norepinephrine to be infused into the central vein of a critically ill patient per second within 1 minute is 0.01 / 60 ml.

[0057] However, because the amount of norepinephrine infused into the central vein of critically ill patients is very small per second, and the central vein of critically ill patients is also under pressure, it is easy to cause the infusion of norepinephrine into the central vein of critically ill patients to be inadequate, that is, to result in the infusion of norepinephrine at a rate of 0.01 / 60 ml per second into the central vein of critically ill patients.

[0058] Therefore, the inventors came up with another method: to continuously infuse norepinephrine into the central vein of critically ill patients via central venous infusion.

[0059] For example, a needle in an IV tubing is inserted into the central venous blood vessel of a critically ill patient. Sodium chloride from the IV bottle is continuously infused into the patient's central venous blood vessel through the main IV tubing and the needle. The IV tubing also has a branch tubing, one end of which is connected to the main tubing, and the other end of which is connected to a pump containing norepinephrine. The pump can inject 0.01 / 60 ml of norepinephrine per second into the main IV tubing (the tubing through which sodium chloride passes) through the branch tubing. The norepinephrine is then flushed into the critically ill patient's central venous blood vessel by gravity through the main IV tubing, thanks to the gravity of the sodium chloride in the IV bottle.

[0060] However, in clinical settings treating critically ill patients, central venous vessels often serve other purposes, such as placing central venous catheters.

[0061] Central venous catheterization is a type of vascular catheter that can be placed in the central vein of the human body for purposes such as blood tests and venous pressure measurement.

[0062] In clinical treatment, it is necessary to test the central venous blood of critically ill patients from time to time. When it is necessary to test the central venous blood of critically ill patients, central venous blood can be collected by inserting a central venous catheter into the central venous vessel of the critically ill patient.

[0063] It is evident that central venous vessels are required for administering norepinephrine to critically ill patients, and central venous blood collection from critically ill patients also requires the use of central venous vessels.

[0064] If the central venous vessels used to administer norepinephrine to critically ill patients and the central venous vessels used to collect central venous blood from critically ill patients are different from those used by the critically ill patients, then the excessive number of central venous vessels involved in the treatment could lead to over-invasive procedures and increase the risk of infection for critically ill patients.

[0065] Therefore, in order to avoid excessive invasive treatment of critically ill patients, one alternative approach is to reduce the invasiveness of too many central venous vessels in critically ill patients. For example, the central venous vessel used to administer norepinephrine to critically ill patients can be the same central venous vessel used to collect central venous blood from critically ill patients.

[0066] For example, a central venous catheter is first inserted into the central venous blood vessel of a critically ill patient, with one end of the catheter inside the patient's central venous blood vessel and the other end outside the patient's skin.

[0067] Normally, the needle in the infusion tubing is inserted into the other end of the central venous catheter located outside the skin of the critically ill patient. Sodium chloride in the infusion bottle is injected into the central venous blood vessel of the critically ill patient through the main tubing, the needle, and the other end of the central venous catheter located outside the skin of the critically ill patient.

[0068] When it is necessary to test the central venous blood of critically ill patients, central venous blood can also be collected from critically ill patients by inserting a central venous catheter into the central venous vessel.

[0069] For example, first remove the needle from the other end of the central venous catheter located outside the skin of the critically ill patient, then attach the blood collection device to the other end of the central venous catheter located outside the skin of the critically ill patient, and then use the blood collection device to draw central venous blood from the critically ill patient through the central venous catheter.

[0070] However, the inventors discovered that the collected central venous blood often contains residual sodium chloride, which can affect the test results and lead to low accuracy.

[0071] Therefore, in another alternative method, before collecting central venous blood from critically ill patients through a central venous catheter inserted into a central venous vessel, a syringe can be first attached to the other end of the central venous catheter located outside the patient's skin to draw out the fluid (containing sodium chloride) from the central venous catheter. The syringe is then removed from the other end of the central venous catheter outside the patient's skin. A blood collection device is then attached to the other end of the central venous catheter outside the patient's skin to draw central venous blood from the critically ill patient. The blood collection device is then removed from the other end of the central venous catheter outside the patient's skin. Then, the needle in the infusion tubing is inserted into the other end of the central venous catheter outside the patient's skin, allowing the sodium chloride in the infusion bottle to continue flowing into the critically ill patient's central venous vessel through the main tubing, needle, and the other end of the central venous catheter outside the patient's skin. The central venous blood collected from the blood collection device is then analyzed.

[0072] However, the inventors discovered that the above operation has an exposure problem, making it susceptible to external contamination and increasing the chance of infection for critically ill patients.

[0073] For example, after the needle in the infusion tubing is removed from the other end of the central venous catheter located outside the skin of a critically ill patient, the needle is exposed and susceptible to external contamination. Similarly, fluid from the central venous catheter (containing sodium chloride) drawn using a syringe is also exposed and susceptible to external contamination.

[0074] Regarding the issue of "exposing the needle in the infusion tubing after removing the other end of the central venous catheter from the skin of a critically ill patient," a new infusion bottle and tubing can be used. The new infusion bottle contains sodium chloride. The needle in the new infusion tubing is inserted into the critically ill patient's central venous system. The sodium chloride in the new infusion bottle is continuously infused into the critically ill patient's central venous system through the main infusion tubing and the needle. The new infusion tubing also has a branch tubing. One end of the branch tubing is connected to the main tubing, and the other end is connected to a new pump containing norepinephrine. The new pump can inject 0.01 / 60 ml of norepinephrine per second into the main infusion tubing (the tubing through which sodium chloride passes) via the branch tubing. The norepinephrine is then flushed into the critically ill patient's central venous system by the gravity effect of the sodium chloride in the new infusion bottle through the main infusion tubing.

[0075] However, the above methods require new infusion bottles, new infusion tubing, and new pumps, which can easily lead to waste of drugs and equipment, resulting in excessively high drug and equipment costs.

[0076] Regarding the issue of "fluid (containing sodium chloride) drawn from a central venous catheter using a syringe being exposed to the outside," the syringe can be discarded, thereby discarding the fluid drawn from the central venous catheter. The fluid drawn from the central venous catheter using a syringe will not be infused back into the critically ill patient's body. Thus, even if the fluid drawn from the central venous catheter using a syringe is exposed to the outside and easily contaminated, because the fluid drawn from the central venous catheter using a syringe is not infused back into the critically ill patient's body through the central venous catheter, no contaminants will enter the critically ill patient's body, and no health or safety threat will be posed to the critically ill patient.

[0077] However, in many cases, the fluid drawn from a central venous catheter using a syringe may contain not only sodium chloride from the infusion bottle, but also a small amount of venous blood from the central venous vessels of critically ill patients. This can easily lead to iatrogenic blood loss in critically ill patients who require frequent blood draws.

[0078] Therefore, in order to avoid iatrogenic blood loss in critically ill patients without wasting medicine or equipment, this utility model solution is proposed.

[0079] See Figure 1 The diagram shows a schematic of an infusion blood collection device according to the present invention: (See attached diagram). Figure 1 The device includes:

[0080] Four-way tube, syringe holder, connector, and protective sleeve.

[0081] The four-way tubing consists of four conduits, a central lumen, and a four-way valve. The four conduits are designated as the first conduit, the second conduit, the third conduit, and the fourth conduit.

[0082] The four catheters are connected to the central lumen.

[0083] The central cavity is used to house the four-way valve.

[0084] The side wall of the main body of the four-way valve is in contact with the side wall of the central inner cavity (it should be noted that the diagram does not show contact in order to clearly illustrate the positional relationship between the various components; in the actual product, they are in contact).

[0085] The four conduits are located on the same plane.

[0086] Of the four catheters, the angle between the first and second catheters is 90 degrees, the angle between the second and third catheters is 90 degrees, the angle between the third and fourth catheters is 90 degrees, and the angle between the fourth catheter and the first catheter is 90 degrees.

[0087] The contact between the side wall of the four-way valve body and the side wall of the central cavity can be understood as: a space is reserved for the four-way valve body to rotate in the central cavity, but the liquid will not leak through this space, and the rotation axis of the four-way valve is perpendicular to the plane where the four conduits are located.

[0088] Figure 2 A schematic diagram of the four conduits in the four-way tube and the central lumen is shown.

[0089] The four-way valve body has four through holes, each extending from the center of the four-way valve body to the side wall of the four-way valve body.

[0090] The four through holes are located on the same plane and are interconnected through the center of the four-way valve body.

[0091] Of the four through holes, the angle between the first and second through holes is greater than 30 degrees and less than 60 degrees, the angle between the second and third through holes is 90 degrees, and the angle between the first and fourth through holes is 180 degrees.

[0092] The main body of the four-way valve extends outward from the central cavity along a direction perpendicular to the plane containing the four through holes, with a rotating handle.

[0093] The rotating handle is used to control the direction of the four through holes in the body of the four-way valve.

[0094] The first catheter is integrally and sealed to the nipple of the syringe barrel in the receiving syringe. When the infusion blood collection device leaves the factory, the first catheter and the nipple of the syringe barrel in the receiving syringe are already integrally formed and sealed and cannot be disassembled.

[0095] One end of the connector is integrated with the outer wall of the second conduit, and the other end of the connector is integrated with the outer wall or end of the protective sleeve. The protective sleeve is used to fit over the second conduit to seal the second conduit, so as to isolate the inside of the second conduit from the outside and avoid external contamination.

[0096] One end of the connector is inseparable from the outer wall of the second conduit and is also inseparable from the outer wall or end of the protective sleeve, in order to avoid loss of the protective sleeve and thus prevent the second conduit from being unable to be sealed.

[0097] The third catheter is used to connect to the end of the central venous catheter.

[0098] The fourth catheter is used to connect one end of the infusion tube, and the other end of the infusion tube is used to connect the infusion bottle.

[0099] In one embodiment, the included angle between the first through hole and the second through hole is 35 degrees, 40 degrees, 45 degrees, 50 degrees, or 55 degrees.

[0100] Figure 3 A schematic diagram of the main body of the four-way valve is shown (only the four through holes in the main body are shown), wherein, in Figure 3 In the middle, the angle between the first through hole and the second through hole is 45 degrees. Figure 3 The 45-degree angle between the first through hole and the second through hole is merely an example of the angle between the first through hole and the second through hole and does not limit the scope of this utility model.

[0101] based on Figure 2 and Figure 3 , Figure 4 A schematic diagram showing the central cavity and the four-way valve superimposed is shown.

[0102] In this invention, the rotating handle is used to control whether the first conduit and the third conduit are connected or not, or to control whether the second conduit and the third conduit are connected or not, or to control whether the third conduit and the fourth conduit are connected or not.

[0103] In one embodiment of this application, the end of the rotating handle has four levers.

[0104] The four rotating rods are located on the same plane. The plane containing the four rotating rods is parallel to the plane containing the four through holes.

[0105] The direction of the first rotating rod is always the same as the direction of the first through hole, the direction of the second rotating rod is always the same as the direction of the second through hole, the direction of the third rotating rod is always the same as the direction of the third through hole, and the direction of the fourth rotating rod is always the same as the direction of the fourth through hole.

[0106] That is, no matter how the four rotating rods are rotated, the direction of the first rotating rod is always the same as the direction of the first through hole, the direction of the second rotating rod is always the same as the direction of the second through hole, the direction of the third rotating rod is always the same as the direction of the third through hole, and the direction of the fourth rotating rod is always the same as the direction of the fourth through hole.

[0107] Figure 5 A schematic diagram showing the four through holes in the body of the four-way valve superimposed on the rotary handle is shown. Figure 5 The diagram shows four rotating rods, and the dashed lines indicate four through holes.

[0108] The statement that "the direction of the first rotating rod is always the same as the direction of the first through hole, the direction of the second rotating rod is always the same as the direction of the second through hole, the direction of the third rotating rod is always the same as the direction of the third through hole, and the direction of the fourth rotating rod is always the same as the direction of the fourth through hole" is to facilitate medical staff to determine which catheters among the first, second, third, and fourth catheters are connected and which are not connected by using the direction of the four rotating rods.

[0109] For example, because the four through holes in the body of the four-way valve are enclosed by the central inner cavity of the four-way tube, medical staff cannot see the direction of the four through holes. However, medical staff can see the direction of the four rotating rods. By observing the direction of the four rotating rods, they can determine the direction of the four through holes. If the direction of any two rotating rods is the same as the direction of two catheters, it means that the direction of the through holes corresponding to these two rotating rods is the same as the direction of the two catheters. Thus, it can be concluded that these two catheters are connected, and the other catheters are not connected.

[0110] For example, combining Figure 1 and Figure 5 In the embodiment shown, the second rotating rod, the second through hole, and the fourth conduit are in the same direction.

[0111] The third rotating rod, the third through hole, and the third guide tube are aligned in the same direction.

[0112] The first rotating rod and the first through hole are not aligned with the direction of the first conduit, and the first rotating rod and the first through hole are not aligned with the direction of the second conduit.

[0113] The fourth rotating rod and the fourth through hole are not aligned with the direction of the first conduit, and the fourth rotating rod and the fourth through hole are not aligned with the direction of the second conduit.

[0114] Therefore, the third catheter is connected to the fourth catheter.

[0115] When the third and fourth catheters are connected, the first and second catheters are not connected, the first and third catheters are not connected, the first and fourth catheters are not connected, the second and third catheters are not connected, and the second and fourth catheters are not connected.

[0116] In another embodiment, Figure 6 A schematic diagram of an infusion blood collection device according to the present invention is shown. Figure 7 A schematic diagram showing the four through holes in the body of the four-way valve superimposed on the rotary handle is shown. Figure 7 The diagram shows four rotating rods, and the dashed lines indicate four through holes.

[0117] For example, combining Figure 6 and Figure 7 In the illustrated embodiment, the first rotating rod, the first through hole, and the first conduit are aligned in the same direction. The fourth rotating rod, the fourth through hole, and the third conduit are aligned in the same direction.

[0118] The second rotating rod and the second through hole are not aligned with the direction of the second conduit, the second rotating rod and the second through hole are not aligned with the direction of the fourth conduit, the third rotating rod and the third through hole are not aligned with the direction of the second conduit, and the third rotating rod and the third through hole are not aligned with the direction of the fourth conduit.

[0119] Therefore, the first catheter is connected to the third catheter. When the first catheter is connected to the third catheter, the first catheter is not connected to the second catheter, the first catheter is not connected to the fourth catheter, the second catheter is not connected to the third catheter, the second catheter is not connected to the fourth catheter, and the third catheter is not connected to the fourth catheter.

[0120] In another embodiment, Figure 8 A schematic diagram of an infusion blood collection device according to the present invention is shown. Figure 9 A schematic diagram showing the four through holes in the body of the four-way valve superimposed on the rotary handle is shown. Figure 9 The diagram shows four rotating rods, and the dashed lines indicate four through holes.

[0121] For example, combining Figure 8 and Figure 9 In the embodiment shown, the third rotating rod, the third through hole, and the second conduit are in the same direction, and the second rotating rod, the second through hole, and the third conduit are in the same direction.

[0122] The first rotating rod and the first through hole are not aligned with the direction of the first conduit. The first rotating rod and the first through hole are not aligned with the direction of the fourth conduit. The fourth rotating rod and the fourth through hole are not aligned with the direction of the first conduit. The fourth rotating rod and the fourth through hole are not aligned with the direction of the fourth conduit.

[0123] Therefore, the second catheter is connected to the third catheter. When the second and third catheters are connected, the first catheter is not connected to the second catheter, the first catheter is not connected to the third catheter, the first catheter is not connected to the fourth catheter, the second catheter is not connected to the fourth catheter, and the third catheter is not connected to the fourth catheter.

[0124] The materials used for the four-way valve, the syringe housing, the connectors, and the protective sleeve can all be medical-grade materials.

[0125] The connector can be made of rubber or plastic, and can have tensile properties and be a soft material.

[0126] The materials for the four-way valve, the syringe housing, the connectors, and the protective sleeve can be the same, for example, the same type of plastic.

[0127] The protective sleeve is used to fit over the second conduit to seal it, thereby isolating it from the outside and preventing external contamination. The outer wall of the second conduit can abut against the inner wall of the protective sleeve to form a seal.

[0128] The third catheter is used to connect to the end of the central venous catheter.

[0129] In scenarios where blood collection devices are used for intravenous infusion, the tip of the central venous catheter is already inside the central venous vessel of the critically ill patient, with most of the catheter body inside the vessel and the tail exposed outside. A third catheter is connected to the tail of the central venous catheter.

[0130] Generally, during treatment, the central venous catheter is not removed from the critically ill patient; that is, it remains in the critically ill patient's body until it is no longer medically necessary to keep the central venous catheter in the critically ill patient's body.

[0131] Secondly, the infusion blood collection device is not removed from the central venous catheter. That is, under normal circumstances, the third catheter remains connected to the end of the central venous catheter until the infusion blood collection device needs to be replaced or other necessary situations arise, at which point the device is removed from the central venous catheter. A central venous catheter is a conduit.

[0132] In subsequent situations where it is necessary to draw central venous blood from critically ill patients for blood tests, medical staff can determine whether the first and third catheters are connected. If the first and third catheters are not connected, medical staff can control the rotation of the handle to connect the first and third catheters, and disconnect the first and fourth catheters, as well as the second and third catheters.

[0133] Afterwards, medical staff can use a syringe to draw fluid from the central venous catheter (the fluid contains sodium chloride and may also contain central venous blood; for example, after drawing fluid from the central venous catheter, they can continue to draw blood, thus filling the central venous catheter with blood. At this point, the fluid in the central venous catheter is often a mixture of sodium chloride and central venous blood, and the ratio between the volume of sodium chloride and the volume of central venous blood varies depending on the circumstances).

[0134] Afterward, medical staff can remove the protective sleeve attached to the second catheter to expose it, and then connect the blood collection device (used separately for blood collection and testing) to the second catheter (e.g., snap-fit, sleeve, or spiral connection), for example, by inserting the nipple of the blood collection device's syringe into the second catheter.

[0135] Then, medical staff can control the rotation of the handle to connect the second catheter to the third catheter, and disconnect the first catheter from the second catheter, the first catheter from the third catheter, the first catheter from the fourth catheter, the second catheter from the fourth catheter, and the third catheter from the fourth catheter.

[0136] Afterwards, medical staff can use a blood collection device to draw blood from the central venous catheter until the volume of central venous blood drawn into the blood collection device meets the requirements for testing.

[0137] Since the fluid from the previous central venous catheter has been drawn into the syringe, the fluid drawn by the blood collection device generally does not contain sodium chloride, but only central venous blood, or may contain a very small amount of sodium chloride, but this generally does not affect the blood test results.

[0138] Afterwards, medical staff can control the rotation of the handle to connect the first catheter to the third catheter, disconnect the first catheter from the second catheter, disconnect the first catheter from the fourth catheter, disconnect the second catheter from the third catheter, disconnect the second catheter from the fourth catheter, and disconnect the third catheter from the fourth catheter.

[0139] Then, medical staff can inject the liquid (a mixture of sodium chloride and central venous blood) from the syringe into the central venous catheter through the first and third catheters.

[0140] Afterwards, medical staff can remove the blood collection device from the second catheter. The central venous blood in the collection device can be used for testing. The port of the second catheter is then disinfected, and a protective sleeve is attached to the second catheter to seal it, isolating it from the outside and preventing external contamination. The outer wall of the second catheter can be pressed against the inner wall of the protective sleeve to form a seal.

[0141] Then, medical staff can control the rotation of the handle to connect the third and fourth catheters, and disconnect the first and second catheters, the first and third catheters, the first and fourth catheters, the second and third catheters, and the second and fourth catheters.

[0142] Subsequently, sodium chloride from the infusion bottle is injected into the critically ill patient's central venous vessel through the main infusion tubing, needle, and the end of the central venous catheter placed outside the patient's skin.

[0143] In one embodiment of this utility model, the volume of the syringe is 6ml to 9ml.

[0144] In one embodiment of this utility model, the inner diameters of the first through hole, the second through hole, the third through hole, and the fourth through hole are all 2 mm, 2.5 mm, or 3 mm.

[0145] In one embodiment of the present invention, a strap is provided on the side wall of the syringe holder, which is used to wrap around the thigh of the human body to fix the syringe holder to the thigh of the human body.

[0146] In one embodiment of this invention, the volume of the blood collection device is 2ml to 20ml. The blood collection device is used to draw central venous blood from critically ill patients.

[0147] In one embodiment of this invention, the syringe includes a syringe barrel and a piston rod. One end of the piston rod is a piston handle, and the other end is a piston, which is located inside the syringe barrel. A movable block is located on the outer wall of the syringe barrel, and this movable block can move along the diameter of the syringe barrel. When the piston and the movable block are aligned, the volume formed between the piston and the inner wall of the syringe barrel is equal to the volume of a central venous catheter, or the volume formed between the piston and the inner wall of the syringe barrel is 0.5 ml to 1 ml larger than the volume of a central venous catheter.

[0148] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0149] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0150] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a structure. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the structure that includes said element.

[0151] The above provides a detailed description of the infusion blood collection device provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. An infusion blood collection device, comprising: include: Four-way tube, syringe storage, connectors, and protective sleeve; The four-way tubing includes: four conduits, a central lumen, and a four-way valve; The four catheters are each connected to the central lumen; The central cavity is used to house the four-way valve; The side wall of the main body of the four-way valve is in contact with the side wall of the central inner cavity; The four conduits are located on the same plane; The angle between the first catheter and the second catheter is 90 degrees, the angle between the second catheter and the third catheter is 90 degrees, the angle between the third catheter and the fourth catheter is 90 degrees, and the angle between the fourth catheter and the first catheter is 90 degrees. The body of the four-way valve has four through holes, which extend from the center of the body of the four-way valve to the side wall of the body of the four-way valve. The four through holes are located on the same plane and are interconnected through the center of the four-way valve body; The angle between the first through hole and the second through hole is greater than 30 degrees and less than 60 degrees, the angle between the second through hole and the third through hole is 90 degrees, and the angle between the first through hole and the fourth through hole is 180 degrees. Along a direction perpendicular to the plane containing the four through holes, the main body of the four-way valve extends outward from the central inner cavity with a rotating handle. The rotating handle is used to control the direction of the four through holes in the body of the four-way valve; The first catheter is integrally and sealed to the nipple of the syringe containing the syringe. One end of the connector is integrated with the outer wall of the second conduit, and the other end of the connector is integrated with the outer wall or end of the protective sleeve. The protective sleeve is used to fit over the second conduit to seal the second conduit so as to isolate the inside of the second conduit from the outside. The third catheter is used to connect to the end of the central venous catheter; The fourth catheter is used to connect one end of the infusion tube.

2. The apparatus of claim 1, wherein, The rotating handle is used to control whether the first catheter and the third catheter are connected or not, or to control whether the second catheter and the third catheter are connected or not, or to control whether the third catheter and the fourth catheter are connected or not; When the third and fourth catheters are connected, the first and second catheters are not connected, the first and third catheters are not connected, the first and fourth catheters are not connected, the second and third catheters are not connected, and the second and fourth catheters are not connected. or, When the first catheter and the third catheter are connected, the first catheter and the second catheter are not connected, the first catheter and the fourth catheter are not connected, the second catheter and the third catheter are not connected, the second catheter and the fourth catheter are not connected, and the third catheter and the fourth catheter are not connected. or, When the second catheter is connected to the third catheter, the first catheter is not connected to the second catheter, the first catheter is not connected to the third catheter, the first catheter is not connected to the fourth catheter, the second catheter is not connected to the fourth catheter, and the third catheter is not connected to the fourth catheter.

3. The apparatus according to claim 1, characterized in that, The end of the rotating handle has four levers; The four rotating rods are located on the same plane; the plane containing the four rotating rods is parallel to the plane containing the four through holes. The direction of the first rotating rod is always the same as the direction of the first through hole, the direction of the second rotating rod is always the same as the direction of the second through hole, the direction of the third rotating rod is always the same as the direction of the third through hole, and the direction of the fourth rotating rod is always the same as the direction of the fourth through hole.

4. The apparatus of claim 1, wherein, The angle between the first through hole and the second through hole is 35 degrees, 40 degrees, 45 degrees, 50 degrees or 55 degrees.

5. The apparatus of claim 1, wherein, The syringe has a capacity of 6ml to 9ml.

6. The apparatus of claim 1, wherein, The inner diameters of the first, second, third, and fourth through holes are all 2 mm, 2.5 mm, or 3 mm, respectively.

7. The apparatus of claim 1, wherein, The syringe holder has straps on its side wall for securing it to the user's thigh.

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