Blood sampling device based on central venous indwelling catheter

Abstract

The utility model provides a blood sampling device based on a central venous indwelling catheter. According to the blood sampling device, when the blood sampling device leaves a factory, the first end of the three-way connector and the first nipple in the needle cylinder of the first injector form an integrally-formed sealed whole body and cannot be detached; in the process of extracting the mixture by using the first injector before the central venous blood of the patient is extracted by using the second injector, and in the process of injecting the mixture in the first injector into the central vein of the patient through the central vein indwelling catheter after the central venous blood of the patient is extracted by using the second injector; the first injector is not pulled out from the first port, a first nipple of a needle cylinder in the first injector is always isolated from the outside and not exposed to the outside, and the first end of the three-way connector 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 a patient, and the patient can be prevented from being polluted. And health and safety threats to patients can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a blood sampling device based on central venous catheterization. Background Art

[0002] With the rapid development of medical technology, central venous catheter has been widely used in clinical practice. Central venous catheter is a kind of intravascular catheter, which is placed in large veins and is used for large and rapid intravenous infusion, blood test, venous pressure measurement, chemotherapy, dialysis, etc.

[0003] In clinical treatment, it is sometimes necessary to test the patient's central venous blood. In this way, the patient's central venous blood can be collected through a central venous catheter inserted into the central vein. However, due to the presence of other liquids in the collected central venous blood (for example, the sealing fluid in the central venous catheter, etc., whose function is to prevent central venous catheter clotting and thus prevent central venous catheter blockage), the other liquids in the collected central venous blood will affect the test results, resulting in low accuracy of the test results.

[0004] To this end, before collecting the patient's central venous blood through a central venous catheter inserted into the central vein, a syringe can be first connected to the central venous catheter to draw out the liquid in the central venous catheter, and then the syringe can be removed from the central venous catheter. Then, another syringe can be first connected to the central venous catheter to draw the patient's central venous blood through the central venous catheter. After that, the other syringe can be removed from the central venous catheter to test the central venous blood in the other syringe.

[0005] The liquid in the central venous catheter drawn out by the single syringe is exposed to the outside and easily contaminated by the outside. Therefore, the liquid in the central venous catheter drawn out by the single syringe is generally discarded and the liquid in the central venous catheter drawn out by the single syringe is no longer returned to the patient's body. However, this can easily lead to iatrogenic blood loss in patients who need frequent blood draws.

[0006] To this end, in order to avoid iatrogenic blood loss in patients who need frequent blood draws, after removing the other syringe from the central venous catheter, the syringe can be placed on the central venous catheter again, and the liquid in the central venous catheter drawn out by the syringe can then be returned to the patient's body through the central venous catheter to avoid iatrogenic blood loss.

[0007] However, as mentioned above, after the syringe is removed from the central venous catheter, the liquid in the central venous catheter drawn out by the syringe is exposed to the outside and easily contaminated by the outside. Therefore, transfusing the liquid in the central venous catheter drawn out by the syringe back into the patient's body through the central venous catheter may cause contaminants to enter the patient's body, which may pose a threat to the patient's health and safety. Utility Model Content

[0008] In order to solve the above technical problems, the utility model shows a blood sampling device based on central venous catheterization, and the blood sampling device comprises:

[0009] A three-way connector, a first syringe, a connector, a protective sleeve, and a connecting vessel;

[0010] The three-way connector includes: a first end, a second end and a third end;

[0011] The first end is integrally sealed and connected with the first nipple of the syringe in the first syringe, wherein, when the device leaves the factory, the first end and the first nipple of the syringe in the first syringe have formed an integrally molded sealing entity and cannot be disassembled;

[0012] One end of the connector is integrated with the outer wall of the second end, 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 be sleeved on the second end to seal the second end, so as to isolate the second end from the outside and avoid external contamination.

[0013] The third end is used to connect the tail of the central venous catheter;

[0014] The communicating device is used to control whether the first end is connected to the third end or not, or to control whether the second end is connected to the third end or not;

[0015] Wherein, when the first end is connected to the third end, the first end is not connected to the second end and the third end is not connected to the second end; or, when the second end is connected to the third end, the second end is not connected to the first end and the third end is not connected to the first end.

[0016] In an optional implementation, the first end includes a first straight tube and a first interface, and the second end includes a second straight tube and a second interface; the portion of the first straight tube close to the first interface is a first hose, and the portion of the second straight tube close to the second interface is a second hose;

[0017] The first interface in the first end is integrally sealed and connected with the first nipple of the syringe in the first syringe, wherein, when the device leaves the factory, the first interface in the first end and the first nipple of the syringe in the first syringe have formed an integrally molded sealed entity and cannot be disassembled;

[0018] One end of the connector is integrated with the outer wall of the second hose in the second end, and the protective sleeve is used to sleeve the second interface in the second end to seal the second interface in the second end, so as to isolate the second interface in the second end from the outside and avoid external contamination;

[0019] The communicating vessel comprises a first flow-stopping clamp and a second flow-stopping clamp;

[0020] The first flow-stopping clamp is arranged on the first hose;

[0021] The second flow-stopping clamp is arranged on the second hose.

[0022] In an optional implementation, the communicating vessel includes a three-way valve;

[0023] The three-way valve includes: a rotating shaft and a handle;

[0024] A portion of the rotating shaft is located inside the three-way interface, the portion located inside the three-way interface has a baffle, and another portion of the rotating shaft is located outside the three-way interface, and the portion located outside the three-way interface is snap-connected with the handle;

[0025] The handle is located outside the three-way interface, and the handle is used to control the rotation of the shaft. The position and direction of the baffle located inside the three-way interface are controlled by the rotation of the shaft to control the connection between the first end of the three-way interface and the third end of the three-way interface or the connection between the second end of the three-way interface and the third end of the three-way interface.

[0026] In an optional implementation, the first end includes a first straight tube and a first interface, the second end includes a second straight tube and a second interface, and the third end includes a third straight tube and a third interface;

[0027] The angle between the third straight tube and the first straight tube is greater than 90 degrees and less than 165 degrees;

[0028] and / or,

[0029] The included angle between the third straight tube and the second straight tube is greater than 90 degrees and less than 165 degrees.

[0030] In an optional implementation, the first end includes a first straight tube and a first interface, the second end includes a second straight tube and a second interface, and the third end includes a third straight tube and a third interface;

[0031] The angle between the third straight tube and the first straight tube is 90 degrees, and the angle between the third straight tube and the second straight tube is 180 degrees;

[0032] or,

[0033] The included angle between the third straight tube and the second straight tube is equal to 90 degrees, and the included angle between the third straight tube and the first straight tube is equal to 180 degrees.

[0034] In an optional implementation, the volume of the first syringe is 5 ml to 10 ml;

[0035] Alternatively, the volume of the first syringe is the same as the volume of the central venous catheter;

[0036] Alternatively, the volume of the first syringe is 0.5 ml to 1 ml larger than the volume of the central venous catheter.

[0037] In an optional implementation, the first syringe comprises a syringe and a piston rod, one end of the piston rod is a piston handle, the other end of the piston rod is a piston, and the piston is located inside the syringe;

[0038] The outer wall of the syringe is provided with a prompt mark;

[0039] Among them, when the piston is aligned with the prompt mark, the volume formed between the piston and the inner wall of the syringe is equal to the volume of the central venous catheter, or the volume formed between the piston and the inner wall of the syringe is 0.5ml to 1ml larger than the volume of the central venous catheter.

[0040] In an optional implementation, the device further includes a second syringe matched with the second end;

[0041] When the protective sleeve is not sleeved on the second end, the second end is used to be detachably connected to the second nipple of the syringe in the second syringe;

[0042] The volume of the second syringe is 2 ml to 20 ml.

[0043] In an optional implementation, the second end includes a second straight tube and a second interface, and the communicating vessel includes a one-way valve;

[0044] The one-way valve is arranged inside the second straight tube; the communicating vessel is used to control the one-way communication between the second end and the third end;

[0045] In the case where the second end is unidirectionally connected to the third end, the third end is connected to the second end, but the second end is not connected to the third end.

[0046] In an optional implementation, the first syringe comprises a syringe and a piston rod, one end of the piston rod is a piston handle, the other end of the piston rod is a piston, and the piston is located inside the syringe;

[0047] One end of the syringe is the first nipple, and the other end of the syringe is the syringe handle;

[0048] The device also includes: a cylindrical plastic sealing film;

[0049] The material of the plastic sealing film is an elastic material; the length of the plastic sealing film after being stretched in the axial direction of the cylinder is greater than or equal to the length of the piston rod;

[0050] One end of the plastic sealing film is connected to the piston handle in an annular sealing sleeve, and the other end of the plastic sealing film is connected to the syringe handle in an annular sealing sleeve to seal the piston rod, so as to isolate the piston rod from the outside and avoid external contamination.

[0051] Compared with the prior art, the utility model has the following advantages:

[0052] In the utility model, before using the second syringe to draw blood, it is supported to use the first syringe to extract liquid through the first end and the third end of the three-way interface, and the liquid includes a mixture of the sealing liquid in the central venous catheter and the patient's central venous blood. Then, the second syringe is used to extract the patient's central venous blood through the second end, the third end and the central venous catheter of the three-way interface, so that the patient's central venous blood drawn by the second syringe includes as little sealing liquid as possible, or even no sealing liquid. This can improve the purity of the patient's central venous blood drawn by the second syringe, avoid dilution of the central venous blood by the sealing liquid, avoid affecting the subsequent test results of the patient's central venous blood drawn by the second syringe, and improve the accuracy of the test results of the patient's central venous blood.

[0053] In addition, the present invention supports injecting the mixture in the first syringe into the patient's central vein via the central venous catheter after the patient's central venous blood is drawn using the second syringe, thereby avoiding iatrogenic blood loss.

[0054] Secondly, when the blood collection device leaves the factory, the first end of the three-way interface and the first nipple in the syringe of the first syringe have formed an integrally molded sealed entity and are non-detachable. In this way, in the process of using the first syringe to extract the mixture before using the second syringe to draw the patient's central venous blood, and in the process of injecting the mixture in the first syringe into the patient's central vein through the central venous catheter after using the second syringe to draw the patient's central venous blood, the first syringe is not unplugged from the first port, and the first nipple of the syringe in the first syringe is always isolated from the outside and not exposed to the outside, so as to avoid external contamination of the first nipple, and the first end of the three-way interface is always isolated from the outside and not exposed to the outside, so as to avoid external contamination of the first end. In this way, external contaminants can be prevented from being injected into the patient's central vein, and health and safety threats to the patient can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a schematic diagram of a blood sampling device based on central venous catheterization of the utility model.

[0056] Figure 2 It is a schematic diagram of a blood sampling device based on central venous catheterization of the utility model.

[0057] Figure 3 It is a schematic diagram of a blood sampling device based on central venous catheterization of the utility model.

[0058] Figure 4 It is a schematic diagram of a blood sampling device based on central venous catheterization of the utility model.

[0059] Figure 5 It is a schematic diagram of a blood sampling device based on central venous catheterization of the utility model.

[0060] Figure 6 It is a schematic diagram of a blood sampling device based on central venous catheterization of the utility model.

[0061] Figure 7 It is a schematic diagram of a blood sampling device based on central venous catheterization of the utility model. DETAILED DESCRIPTION

[0062] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0063] See also Figure 1 , showing a schematic diagram of a blood sampling device based on central venous catheterization of the present invention: wherein, see Figure 1 , the blood collection device comprises:

[0064] Three-way connector 01, first syringe 02, connector 03, protective sleeve 04 and connecting vessel ( Figure 1 not shown).

[0065] The three-way connector includes: a first end 011 ( Figure 1 The dotted line portion pointed to by 011 in the figure), the second end 012 and the third end 013.

[0066] The first syringe 02 includes a syringe barrel 021 and a piston rod 022 .

[0067] One end of the piston rod 022 is a piston handle 0221 , and the other end of the piston rod 022 is a piston 0222 , and the piston 0222 is located inside the syringe 021 .

[0068] One end of the syringe 021 is a first nipple 0211 ( Figure 1 The other end of the syringe 021 is the syringe handle 0212.

[0069] The material of the three-way connector, the material of the first syringe, the material of the connector, the material of the protective sleeve and the material of the connecting vessel may all be medical grade materials.

[0070] The first end of the three-way interface is integrally sealed and connected with the first nipple in the syringe of the first syringe.

[0071] When the blood sampling device leaves the factory, the first end of the three-way interface and the first nipple in the syringe of the first syringe have formed an integrally formed sealed entity and cannot be disassembled.

[0072] In this way, the first nipple of the syringe in the first syringe is isolated from the outside, which can avoid external contamination, and the first end of the three-way interface is isolated from the outside, which can avoid external contamination.

[0073] The material of the connector can be rubber or plastic, etc., which can have tensile properties and is a soft material.

[0074] One end of the connector is integrated with the outer wall of the second end of the three-way interface (the outer wall of the second end of the three-way interface is located on the side of the second end of the three-way interface), and the other end of the connector is integrated with the outer wall of the protective sleeve (the outer wall of the protective sleeve is located on the side of the protective sleeve) or the end (the outer wall of the protective sleeve is located on the outside of the top of the protective sleeve).

[0075] Among them, one end of the connector and the outer wall of the second end of the three-way interface are inseparable or non-detachable, and the other end of the connector and the outer wall or end of the protective sleeve are inseparable or non-detachable, so as to avoid the loss of the protective sleeve, and thereby avoid the failure to seal the second end of the three-way interface and avoid the failure to seal the second end.

[0076] The material of the connector, the material of the second end of the three-way interface, and the material of the protective sleeve may be the same material, for example, the same type of plastic.

[0077] The protective sleeve is used to be sleeved on the second end of the three-way interface to seal the second end of the three-way interface, so as to isolate the second end of the three-way interface from the outside and avoid external contamination. The outer wall of the second end of the three-way interface can abut against the inner wall of the protective sleeve to form a seal.

[0078] The third end of the three-way interface is used to connect the tube tail of the central venous catheter.

[0079] The communicating device is used to control whether the first end of the three-way interface is connected or not connected with the third end of the three-way interface, or to control whether the second end of the three-way interface is connected or not connected with the third end of the three-way interface.

[0080] The communicating vessel may include: a flow-stop clamp, a three-way valve or a one-way valve, etc.

[0081] Among them, when the first end of the three-way interface is connected to the third end of the three-way interface, the first end of the three-way interface is not connected to the second end of the three-way interface and the third end of the three-way interface is not connected to the second end of the three-way interface.

[0082] Alternatively, when the second end of the three-way interface is connected to the third end of the three-way interface, the second end of the three-way interface is not connected to the first end of the three-way interface and the third end of the three-way interface is not connected to the first end of the three-way interface.

[0083] In the scenario of using the blood collection device, the tube head of the central venous catheter is already located inside the patient's central vein, most of the tube body of the central venous catheter is located inside the patient's central vein, and the tube tail of the central venous catheter is exposed to the outside of the patient. The third end of the three-way interface is already connected to the tube tail of the central venous catheter.

[0084] Generally, the central venous catheter is not removed from the patient's body, that is, it remains in the patient's body until it is no longer medically needed. Secondly, the blood collection device is not removed from the central venous catheter, that is, generally, the third end of the three-way interface remains connected to the tail of the central venous catheter until the blood collection device needs to be replaced or other necessary circumstances occur, then the blood collection device is removed from the central venous catheter.

[0085] A central venous catheter is a pipe. When "the tip of the central venous catheter is already inside the patient's central vein, and most of the body of the central venous catheter is inside the patient's central vein", there is a possibility of venous blood remaining inside the central venous catheter. Therefore, there is a possibility of blood coagulation, which may in turn block the central venous catheter. To this end, in order to avoid blockage of the central venous catheter, it is generally necessary to inject a sealing liquid (such as an anticoagulant, etc.) into the central venous catheter from the second end of the three-way interface, for example, so that the sealing liquid fills the central venous blood vessel. The sealing liquid may include heparin or saline, etc., to avoid blood coagulation in the central venous catheter, thereby avoiding blockage of the central venous catheter.

[0086] Later, when it is necessary to draw central venous blood from the patient for blood tests, the medical staff can determine whether the first end of the three-way interface is connected to the third end of the three-way interface. If the first end of the three-way interface is not connected to the third end of the three-way interface, the medical staff can control the connecting device to connect the first end of the three-way interface to the third end of the three-way interface.

[0087] Afterwards, the medical staff can use the first syringe to extract the liquid in the central venous catheter (the liquid contains sealing fluid and may also contain central venous blood. For example, after extracting the sealing fluid in the central venous catheter, continue to extract central venous blood. In this way, the central venous catheter can be filled with central venous blood. It can be seen that the liquid is often a mixture of sealing fluid and central venous blood. In the mixture, the ratio between the volume of sealing fluid and the volume of central venous blood is not the same in different situations).

[0088] Afterwards, the medical staff can remove the protective cover sleeved on the second end of the three-way interface to expose the second end of the three-way interface to the outside, and then connect the second syringe to the second end of the three-way interface (for example, snap-on, sleeve or spiral connection, etc.), for example, insert the second nipple of the syringe barrel of the second syringe into the second end of the three-way interface, etc.

[0089] Then, the medical staff can control the connecting device to disconnect the first end of the three-way interface from the third end of the three-way interface, and to connect the second end of the three-way interface with the third end of the three-way interface.

[0090] Afterwards, the medical staff can use the second syringe to draw central venous blood from the central venous catheter until the volume of the central venous blood drawn into the second syringe meets the test requirements.

[0091] Since the liquid in the previous central venous catheter has been drawn into the first syringe, the liquid drawn out of the second syringe generally does not include the sealing fluid, but only includes central venous blood, or may include a very small amount of sealing fluid, which generally does not affect the results of blood tests.

[0092] Afterwards, the medical staff can control the connecting device to connect the first end of the three-way interface with the third end of the three-way interface, and to disconnect the first end of the three-way interface from the second end of the three-way interface.

[0093] Then, the medical staff can inject all the liquid in the first syringe (a mixture of the sealing solution and the central venous blood) into the central venous catheter through the second end.

[0094] Medical staff can unplug the second syringe from the second end of the three-way interface, and the central venous blood in the second syringe can be used for testing. Secondly, medical staff can insert the third syringe into the second end of the three-way interface, and the third syringe contains sealing liquid.

[0095] Then, the medical staff can control the connecting device to disconnect the first end of the three-way interface from the third end of the three-way interface, and to connect the second end of the three-way interface with the third end of the three-way interface.

[0096] Then, the medical staff can inject the sealing liquid in the third syringe into the central venous catheter via the second end and the third end, so that the central venous catheter is filled with the sealing liquid.

[0097] Then, the medical staff can control the connecting device to disconnect the second end of the three-way interface from the third end of the three-way interface, and to connect the first end of the three-way interface with the third end of the three-way interface.

[0098] Afterwards, the medical staff can remove the third syringe from the second end of the three-way interface, disinfect the second end, and then put the protective sleeve on the second end of the three-way interface to seal the second end of the three-way interface, so as to isolate the second end of the three-way interface from the outside and avoid external contamination. The outer wall of the second end of the three-way interface can abut against the inner wall of the protective sleeve to form a seal.

[0099] In the utility model, before using the second syringe to draw blood, it is supported to use the first syringe to extract liquid through the first end and the third end of the three-way interface, and the liquid includes a mixture of the sealing liquid in the central venous catheter and the patient's central venous blood. Then, the second syringe is used to extract the patient's central venous blood through the second end, the third end and the central venous catheter of the three-way interface, so that the patient's central venous blood drawn by the second syringe includes as little sealing liquid as possible, or even no sealing liquid. This can improve the purity of the patient's central venous blood drawn by the second syringe, avoid dilution of the central venous blood by the sealing liquid, avoid affecting the subsequent test results of the patient's central venous blood drawn by the second syringe, and improve the accuracy of the test results of the patient's central venous blood.

[0100] In addition, the present invention supports injecting the mixture in the first syringe into the patient's central vein via the central venous catheter after the patient's central venous blood is drawn using the second syringe, thereby avoiding iatrogenic blood loss.

[0101] Secondly, when the blood collection device leaves the factory, the first end of the three-way interface and the first nipple in the syringe of the first syringe have formed an integrally molded sealed entity and are non-detachable. In this way, in the process of using the first syringe to extract the mixture before using the second syringe to draw the patient's central venous blood, and in the process of injecting the mixture in the first syringe into the patient's central vein through the central venous catheter after using the second syringe to draw the patient's central venous blood, the first syringe is not unplugged from the first port, and the first nipple of the syringe in the first syringe is always isolated from the outside and not exposed to the outside, so as to avoid external contamination of the first nipple, and the first end of the three-way interface is always isolated from the outside and not exposed to the outside, so as to avoid external contamination of the first end. In this way, external contaminants can be prevented from being injected into the patient's central vein, and health and safety threats to the patient can be avoided.

[0102] In another embodiment of the utility model, the blood sampling device further comprises a second syringe matched with the second end of the three-way interface.

[0103] When the protective sleeve is not sleeved on the second end of the three-way interface, the second end of the three-way interface is used for detachable connection with the second nipple of the syringe in the second syringe.

[0104] For example, the second end of the three-way interface includes a second straight tube and a second interface. When the protective sleeve is not sleeved on the second end of the three-way interface, the second interface in the second end of the three-way interface is used to be detachably connected to the second nipple of the syringe in the second syringe.

[0105] The volume of the second syringe is 2 ml to 20 ml.

[0106] The second syringe is used to draw blood from the patient's central vein.

[0107] Each time when drawing the patient's central venous blood, a different second syringe can be used to draw blood.

[0108] In one embodiment of the present invention, see Figure 2 The first end 011 of the three-way interface includes a first straight tube 0111 and a first interface 0112. The first interface can be understood as the end of the end of the first straight tube. The end of the first straight tube is a circular opening, which can be regarded as the first interface, which is used to be integrated and sealed with the first end of the three-way interface and the first nipple in the syringe barrel of the first syringe.

[0109] The second end 012 of the three-way interface includes a second straight pipe 0121 and a second interface 0122. The second interface can be understood as the end of the second straight pipe. The end of the second straight pipe is a circular opening and can be regarded as a second interface for being sleeved by the protective sleeve.

[0110] Part of the first straight pipe is a first hose, and part of the second straight pipe is a second hose.

[0111] In one example, the portion of the first straight pipe close to the first interface is the first hose, and the portion of the second straight pipe close to the second interface is the second hose. The hose can be understood as a tube made of soft material.

[0112] When no pressure is applied to the first hose, the first hose is connected. When pressure is applied to the first hose, the inner walls of the first hose are closely adjacent to each other, that is, the first hose is not connected.

[0113] When no pressure is applied to the second hose, the second hose is connected. When pressure is applied to the second hose, the inner walls of the second hose are close to each other, that is, the second hose is not connected.

[0114] When no force is applied, the shape of the hose is straight or nearly straight, without any bends.

[0115] The first interface in the first end of the three-way interface is integrally sealed and connected with the first nipple of the syringe in the first syringe.

[0116] When the blood sampling device leaves the factory, the first interface in the first end of the three-way interface and the first nipple in the syringe of the first syringe have formed an integrally formed sealed entity and cannot be disassembled.

[0117] One end of the connecting body is integrated with the outer wall of the second hose in the second end of the three-way interface.

[0118] The protective sleeve is used to be sleeved on the second interface in the second end of the three-way interface to seal the second interface in the second end of the three-way interface, so as to isolate the second interface in the second end of the three-way interface from the outside and avoid external contamination.

[0119] Among them, Figure 2 In the embodiment, the communicating vessel comprises a first flow-stopping clamp 05 and a second flow-stopping clamp 06 .

[0120] The first stopper is arranged on the first hose, and the second stopper is arranged on the second hose. Figure 2 The example in which the first flow-stop clamp and the second flow-stop clamp are both in the open state is used for illustration, but this does not limit the protection scope of the utility model, and the situation in which the first flow-stop clamp and / or the second flow-stop clamp are in the closed state is not shown in the figure.

[0121] In one example, by default, the first flow-stopping clamp is in an open state, and the second flow-stopping clamp is in a closed state.

[0122] When the first flow stop clamp is in the open state and the second flow stop clamp is in the closed state, the first end of the three-way interface is connected to the third end of the three-way interface, the first end of the three-way interface is not connected to the second end of the three-way interface, and the third end of the three-way interface is not connected to the second end of the three-way interface.

[0123] In which, when it is necessary to make "the second end of the through interface connected to the third end of the three-way interface", the medical staff can manually control the first flow-stop clamp to close and control the second flow-stop clamp to open.

[0124] When the first stop clamp is in the closed state and the second stop clamp is in the open state, the second end of the three-way interface is connected to the third end of the three-way interface, the second end of the three-way interface is not connected to the first end of the three-way interface, and the third end of the three-way interface is not connected to the first end of the three-way interface.

[0125] In another embodiment of the present invention, see Figure 3 , the communicating vessel includes a three-way valve 07.

[0126] The three-way valve 07 includes a rotating shaft 071 and a handle 072 .

[0127] A portion of the rotating shaft is located inside the three-way interface, and the portion located inside the three-way interface has a baffle ( Figure 3The other part of the rotating shaft is located outside the three-way interface, and the part located outside the three-way interface is snap-connected with the handle.

[0128] The handle is located outside the three-way interface, and the handle is used to control the rotation of the shaft. The position and direction of the baffle located inside the three-way interface are controlled by the rotation of the shaft to control the connection between the first end of the three-way interface and the third end of the three-way interface or the connection between the second end of the three-way interface and the third end of the three-way interface.

[0129] In another embodiment of the utility model, the first end of the three-way interface includes a first straight pipe and a first interface, the second end of the three-way interface includes a second straight pipe and a second interface, and the third end of the three-way interface includes a third straight pipe and a third interface.

[0130] The included angle between the third straight tube and the first straight tube is greater than or equal to 90 degrees and less than 165 degrees. And / or, the included angle between the third straight tube and the second straight tube is greater than or equal to 90 degrees and less than 165 degrees.

[0131] In this way, it is convenient for liquid to flow from the central venous catheter into the first syringe via the third straight tube and the first straight tube, and it is convenient for liquid to flow from the first syringe, the first straight tube and the third straight tube into the central venous catheter.

[0132] Also, it is convenient for liquid to flow from the central venous catheter into the second syringe (used to extract central venous blood for testing) via the third straight tube and the second straight tube, and it is convenient for liquid to flow from the second syringe, the second straight tube and the third straight tube into the central venous catheter.

[0133] Among them, three examples are used to illustrate the utility model, but they are not intended to limit the protection scope of the utility model.

[0134] For example, see Figure 4 The included angle between the third straight tube and the first straight tube is 135 degrees, and the included angle between the third straight tube and the second straight tube is 135 degrees.

[0135] In addition, in another embodiment of the present invention, see Figure 5 , the angle between the third straight tube and the first straight tube is equal to 90 degrees, and the angle between the third straight tube and the second straight tube is equal to 180 degrees.

[0136] Alternatively, in another embodiment of the present invention, see Figure 6 , the angle between the third straight tube and the second straight tube is equal to 90 degrees, and the angle between the third straight tube and the first straight tube is equal to 180 degrees.

[0137] In the utility model, the first syringe is used to extract the liquid remaining in the central venous catheter in the patient's body through the first end of the three-way interface before extracting the patient's central venous blood through the second port of the three-way interface (the liquid may be a mixture of blood and sealing fluid, etc.). There are many models of central venous catheters on the market, and the volumes of central venous catheters of different models are not the same. According to statistics, the volume of central venous catheters on the market is basically within 5 ml.

[0138] Thus, in order to adapt to different types of central venous catheters, in one embodiment of the present invention, the volume of the first syringe is 5ml-10ml, that is, the volume of the first syringe can be greater than or equal to the volume of central venous catheters on the market.

[0139] This allows the first syringe to extract as much of the sealing fluid remaining in the central venous catheter in the patient's body as possible, so that the patient's central venous blood subsequently drawn through the second port of the three-way interface contains as little sealing fluid as possible, that is, improves the purity of the patient's central venous blood subsequently drawn through the second port of the three-way interface.

[0140] Alternatively, in another embodiment of the present invention, the volume of the first syringe can be the same as the volume of the central venous catheter, which is now located in the patient's body. In this scenario, the first syringe in the blood collection device can be designed to match the model of the central venous catheter located in the patient's body, because there are many models of central venous catheters on the market, and the volumes of different models of central venous catheters are not the same.

[0141] Thus, for any volume of central venous catheter, a matching blood collection device can be developed in advance for the volume of central venous catheter, and the volume of the first syringe in the matching blood collection device is equal to the volume, and the same is true for each other volume of central venous catheter. Therefore, there are several volumes of central venous catheters on the market, and several blood collection devices are developed in advance.

[0142] This allows the first syringe to extract as much of the sealing fluid remaining in the central venous catheter in the patient's body as possible, so that the patient's central venous blood subsequently drawn through the second port of the three-way interface contains as little sealing fluid as possible, that is, improves the purity of the patient's central venous blood subsequently drawn through the second port of the three-way interface.

[0143] Alternatively, in another embodiment of the utility model, the volume of the first syringe is 0.5ml to 1ml larger than the volume of the central venous catheter, which is located in the patient's body. In this scenario, the first syringe in the blood collection device can be designed to match the model of the central venous catheter located in the patient's body, because there are many models of central venous catheters on the market, and the volumes of different models of central venous catheters are not only the same.

[0144] In this way, for any volume of central venous catheter, a blood sampling device can be developed specifically for the volume of central venous catheter in advance, and the volume of the first syringe in the matching blood sampling device is 0.5ml to 1ml larger than the volume, and the same is true for each other volume of central venous catheter. Therefore, there are several volumes of central venous catheters on the market, and several blood sampling devices are developed in advance. Compared with the previous embodiment, the volume of the first syringe in the embodiment of the utility model is larger, so that the redundancy is larger, and the first syringe can be further enabled to extract as much of the sealing liquid remaining in the central venous catheter in the patient's body as possible, so that the patient's central venous blood extracted through the second port of the three-way interface includes as little sealing liquid as possible, that is, the purity of the patient's central venous blood extracted through the second port of the three-way interface is improved.

[0145] In another embodiment of the present invention, see Figure 7 The first syringe 02 has a syringe barrel 021 and a piston rod 022. One end of the piston rod 022 is a piston handle 0221, and the other end of the piston rod 022 is a piston 0222, and the piston 0222 is located inside the syringe barrel 021.

[0146] The outer wall of the syringe 021 is provided with a reminder mark 08. The reminder mark can be a groove engraved on the outer wall of the syringe 021, or a strip pasted on the outer wall of the syringe 021, etc.

[0147] In one example, the reminder mark 08 may surround the outer wall of the syringe 021, etc.

[0148] Among them, when the piston is aligned with the prompt mark, that is, when the position of the piston is aligned with the position of the prompt mark, the volume formed between the piston and the inner wall of the syringe is equal to the volume of the central venous catheter, or, the volume formed between the piston and the inner wall of the syringe is 0.5ml to 1ml larger than the volume of the central venous catheter.

[0149] Before using the second syringe to draw the patient's central venous blood, the medical staff can easily know that the position of the piston needs to be aligned with the prompt mark when using the first syringe to draw the liquid in the central venous catheter, otherwise there may be residual sealing liquid in the central venous catheter. In this way, the purity of the central venous blood drawn from the patient using the second syringe can be improved. In addition, it is easy to know that the position of the piston is aligned with the prompt mark, and there is no need to use the first syringe to continue to draw more liquid, which can save time.

[0150] In another embodiment of the utility model, the second end of the three-way interface includes a second straight pipe and a second interface, and the connecting vessel includes a one-way valve.

[0151] The one-way valve is arranged inside the second straight pipe. The communicating vessel is used to control the one-way communication between the second end of the three-way interface and the third end of the three-way interface.

[0152] Among them, when the second end of the three-way interface is unidirectionally connected to the third end of the three-way interface, the third end of the three-way interface is connected to the second end of the three-way interface, and the second end of the three-way interface is not connected to the third end of the three-way interface.

[0153] In this way, the liquid can flow from the third end of the three-way interface through the one-way valve to the second interface, for example, the second syringe connected to the second interface.

[0154] However, the liquid cannot flow from the second interface to the third end of the three-way interface through the one-way flow flap, for example, the second syringe connected to the second interface cannot flow to the third end of the three-way interface through the one-way flow flap.

[0155] In this way, even if the second interface is contaminated by the external environment when exposed, the contaminants will not enter the three-way interface through the one-way valve-the second interface, and will not enter the patient's body through the third interface, avoiding threats to the patient's health.

[0156] In another embodiment of the utility model, the first syringe comprises a syringe and a piston rod, one end of the piston rod is a piston handle, the other end of the piston rod is a piston, and the piston is located inside the syringe.

[0157] One end of the syringe is the first nipple, and the other end of the syringe is the syringe handle.

[0158] The blood collection device also includes: a cylindrical plastic sealing film.

[0159] The material of the plastic sealing film is an elastic material. The length of the plastic sealing film after being stretched in the axial direction of the cylinder is greater than or equal to the length of the piston rod.

[0160] One end of the plastic sealing film is connected to the piston handle in an annular sealing sleeve, and the other end of the plastic sealing film is connected to the syringe handle in an annular sealing sleeve to seal the piston rod, so as to isolate the piston rod from the outside and avoid external contamination.

[0161] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0162] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0163] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a structure including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a structure. In the absence of further restrictions, the elements defined by the sentence "including a ..." do not exclude the presence of other identical elements in the structure including the elements.

[0164] The above is a detailed introduction to a blood collection device based on central venous catheterization provided by the utility model. This article uses specific examples to illustrate the principles and implementation methods of the utility model. The description of the above embodiments is only used to help understand the method of the utility model and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A blood sampling device based on central venous catheterization, characterized in that: The blood sampling device comprises: A three-way connector, a first syringe, a connector, a protective sleeve, and a connecting vessel; The three-way connector includes: a first end, a second end and a third end; The first end is integrally sealed and connected with the first nipple of the syringe in the first syringe, wherein the first end and the first nipple of the syringe in the first syringe have formed an integrally molded sealing entity and cannot be disassembled; One end of the connector is integrated with the outer wall of the second end, 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 be sleeved on the second end to seal the second end, so as to isolate the second end from the outside and avoid external contamination. The third end is used to connect the tail of the central venous catheter; The communicating device is used to control whether the first end is connected to the third end or not, or to control whether the second end is connected to the third end or not; Wherein, when the first end is connected to the third end, the first end is not connected to the second end and the third end is not connected to the second end; or, when the second end is connected to the third end, the second end is not connected to the first end and the third end is not connected to the first end.

2. The device according to claim 1, characterized in that The first end includes a first straight tube and a first interface, and the second end includes a second straight tube and a second interface; the portion of the first straight tube close to the first interface is a first hose, and the portion of the second straight tube close to the second interface is a second hose; The first interface in the first end is integrally sealed and connected with the first nipple of the syringe in the first syringe, wherein the first interface in the first end and the first nipple of the syringe in the first syringe have formed an integrally molded sealing entity and cannot be disassembled; One end of the connector is integrated with the outer wall of the second hose in the second end, and the protective sleeve is used to sleeve the second interface in the second end to seal the second interface in the second end, so as to isolate the second interface in the second end from the outside and avoid external contamination; The communicating vessel comprises a first flow-stopping clamp and a second flow-stopping clamp; The first flow-stopping clamp is arranged on the first hose; The second flow-stopping clamp is arranged on the second hose.

3. The device according to claim 1, characterized in that The communicating vessel includes a three-way valve; The three-way valve includes: a rotating shaft and a handle; A portion of the rotating shaft is located inside the three-way interface, the portion located inside the three-way interface has a baffle, and another portion of the rotating shaft is located outside the three-way interface, and the portion located outside the three-way interface is snap-connected with the handle; The handle is located outside the three-way interface, and the handle is used to control the rotation of the shaft. The position and direction of the baffle located inside the three-way interface are controlled by the rotation of the shaft to control the connection between the first end of the three-way interface and the third end of the three-way interface or the connection between the second end of the three-way interface and the third end of the three-way interface.

4. The device according to claim 1, characterized in that The first end includes a first straight tube and a first interface, the second end includes a second straight tube and a second interface, and the third end includes a third straight tube and a third interface; The angle between the third straight tube and the first straight tube is greater than 90 degrees and less than 165 degrees; and / or, The included angle between the third straight tube and the second straight tube is greater than 90 degrees and less than 165 degrees.

5. The device according to claim 1, characterized in that The first end includes a first straight tube and a first interface, the second end includes a second straight tube and a second interface, and the third end includes a third straight tube and a third interface; The angle between the third straight tube and the first straight tube is 90 degrees, and the angle between the third straight tube and the second straight tube is 180 degrees; or, The included angle between the third straight tube and the second straight tube is equal to 90 degrees, and the included angle between the third straight tube and the first straight tube is equal to 180 degrees.

6. The device according to claim 1, characterized in that The volume of the first syringe is 5ml to 10ml; Alternatively, the volume of the first syringe is the same as the volume of the central venous catheter; Alternatively, the volume of the first syringe is 0.5 ml to 1 ml larger than the volume of the central venous catheter.

7. The device according to claim 1 or 6, characterized in that The first syringe comprises a syringe and a piston rod, one end of the piston rod is a piston handle, the other end of the piston rod is a piston, and the piston is located inside the syringe; The outer wall of the syringe is provided with a reminder mark; Among them, when the piston is aligned with the prompt mark, the volume formed between the piston and the inner wall of the syringe is equal to the volume of the central venous catheter, or the volume formed between the piston and the inner wall of the syringe is 0.5ml to 1ml larger than the volume of the central venous catheter.

8. The device according to claim 1, characterized in that The device also includes a second syringe matched with the second end; When the protective sleeve is not sleeved on the second end, the second end is used to be detachably connected to the second nipple of the syringe in the second syringe; The volume of the second syringe is 2 ml to 20 ml.

9. The device according to claim 1, characterized in that The second end includes a second straight pipe and a second interface, and the communicating vessel includes a one-way valve; The one-way valve is arranged inside the second straight tube; the communicating vessel is used to control the one-way communication between the second end and the third end; In the case where the second end is unidirectionally connected to the third end, the third end is connected to the second end, but the second end is not connected to the third end.

10. The device according to claim 1, characterized in that The first syringe comprises a syringe and a piston rod, one end of the piston rod is a piston handle, the other end of the piston rod is a piston, and the piston is located inside the syringe; One end of the syringe is the first nipple, and the other end of the syringe is the syringe handle; The device also includes: a cylindrical plastic sealing film; The material of the plastic sealing film is an elastic material; the length of the plastic sealing film after being stretched in the axial direction of the cylinder is greater than or equal to the length of the piston rod; One end of the plastic sealing film is connected to the piston handle in an annular sealing sleeve, and the other end of the plastic sealing film is connected to the syringe handle in an annular sealing sleeve to seal the piston rod, so as to isolate the piston rod from the outside and avoid external contamination.

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