Fixed blood collection apparatus

Abstract

The present application discloses a fixed blood collection apparatus and relates to the technical field of medical blood collection. The fixed blood collection apparatus comprises a blood collection needle, a tail needle, a connecting piece, and a filter element. The connecting piece is made of a transparent material. A flow channel is formed in the connecting piece. A fixed end of the blood collection needle and a fixed end of the tail needle are both sealed and fixed to the flowing channel. The filter element can adjust the communication between the internal gas of the connecting piece and external air. When the filter element does not make contact with liquid, the communication between the internal gas of the connecting piece and external air is opened, so that the patient's blood can flow out more easily under the action of atmospheric pressure. When the filter element makes contact with liquid, the communication between the internal gas of the connecting piece and external air is closed, and blood flows through the connecting piece; at the same time, the medical professional can observe the flowing of blood by means of the connecting piece made of the transparent material and timely use a collecting end of the tail needle to puncture a protective sleeve and then insert the tail needle into a vacuum blood collection tube to achieve blood collection.

Description

Fixed blood collection device Technical Field

[0001] The present application relates to the field of medical blood sampling technology, and in particular to a fixed blood sampling device. Background Art

[0002] Venipuncture is the main method for obtaining blood samples, and a fixed blood collection device is often used during venipuncture. Existing fixed blood collection devices generally include a blood collection needle, a tail needle, and a connector connecting the two. The fixed end of the blood collection needle and the fixed end of the tail needle are both fixed inside the connector, and the blood collection end of the blood collection needle and the collection end of the tail needle extend out from both ends of the connector. Among them, the tail needle is generally provided with a protective cover on the periphery of its collection end. During the operation, medical staff first use the blood collection end of the blood collection needle to puncture the patient's human vein, and then puncture the protective cover with the collection end of the tail needle and insert it into the vacuum collection tube. The blood passes through the blood collection needle, the connector, and the tail needle in turn, and enters the interior of the vacuum collection tube, completing the blood collection.

[0003] However, during the actual blood collection process, medical staff often encounter the phenomenon that the patient's blood cannot flow out due to insufficient blood pressure or improper puncture position. Different patients may have different blood flow rates under different circumstances. This will cause medical staff to be unable to judge when to pierce the protective cover of the collection end of the tail needle and insert it into the vacuum blood collection tube, which brings inconvenience to the medical staff's operation and increases the patient's pain to a certain extent.

[0004] Summary of the Invention

[0005] The technical problem to be solved by the present application is to provide a fixed blood collection device in order to overcome the defects in the prior art in that the patient's blood is not easy to flow out and the medical staff cannot quickly see the blood return.

[0006] This application solves the above technical problems through the following technical solutions:

[0007] A fixed blood collection device, comprising a blood collection needle, a tail needle and a connecting piece, wherein the connecting piece is made of a transparent material, a flow channel is provided inside the connecting piece, and the fixed ends of the blood collection needle and the tail needle are both sealed and fixed to the flow channel;

[0008] The fixed blood collection device also includes a filter element, which can adjust the communication relationship between the internal gas of the connecting part and the external air; wherein, when the filter element is not in contact with liquid, the communication relationship between the internal gas of the connecting part and the external air is opened, and when the filter element is in contact with liquid, the communication relationship between the internal gas of the connecting part and the external air is closed.

[0009] In this solution, a filter element is provided on the fixed blood collection device, so that the internal gas of the connector and the outside air can be connected as needed, and the change in air pressure is used to promote the blood to be extracted more smoothly; when the medical staff uses the blood collection end of the blood collection needle to puncture the patient's human vein, the filter element has not yet come into contact with the blood, and the air pressure inside the connector is the same as the atmospheric pressure. Under the action of the air pressure, the patient's blood flows out more easily. When the filter element comes into contact with the blood, the internal gas of the connector is isolated from the outside air by the filter element, and the blood flows through the connector. At the same time, the medical staff can know the blood flow by observing the transparent connector, so that the collection end of the tail needle can be inserted into the vacuum blood collection tube in time after piercing the protective cover, thereby completing the blood collection.

[0010] Furthermore, a through hole is provided on the side wall of the connecting member, the through hole is connected to the flow channel, and the filter element is arranged in the interior of the through hole.

[0011] In this solution, a through hole connected to the flow channel is opened on the side wall of the connector, and a filter element is placed through the through hole. Compared with setting the filter element at other positions of the connector, it is more convenient to use the through hole to directly connect the internal gas of the connector with the outside air, and use the filter element to adjust the connection relationship.

[0012] Furthermore, along the length direction of the flow channel, the position of the filter element on the connecting piece is located between the fixed end of the blood collection needle and the fixed end of the tail needle.

[0013] In this solution, when the filter element is arranged in the through hole on the side wall of the connector, the position of the filter element on the connector is located between the fixed end of the blood collection needle and the fixed end of the tail needle, so that the through hole where the filter element is placed can be directly connected to the flow channel, which is more convenient for the internal gas of the connector and the outside air to be connected, so that the blood can be drawn out more smoothly.

[0014] Furthermore, the tail needle is also sealed with a protective cover on the periphery of its collecting end;

[0015] The fixed end of the tail needle includes a sealing section and a connecting section along the length direction of the flow channel. The sealing section is arranged close to the fixed end of the blood collection needle. The fixed end of the tail needle is sealed and fixed in the flow channel through the sealing section. The outer wall of the connecting section has a gap between the flow channel and the connecting piece, and the filter element is arranged on the connecting piece corresponding to the connecting section.

[0016] In this solution, when the filter element is arranged in the side wall through hole of the connecting piece, a protective cover is provided to seal the outer periphery of the collecting end of the tail needle, and a sealing section and a connecting section are provided at the fixed end of the tail needle. The filter element is provided on the connecting piece corresponding to the connecting section, so that the internal gas of the flow channel passes through the tail needle to reach the inside of the protective cover, and then passes through the connecting section of the tail needle to reach the position of the filter element, thereby satisfying the connection between the internal gas of the flow channel and the outside air, so that the blood can be extracted more smoothly.

[0017] Furthermore, the through hole is provided with a step portion at one end close to the communicating channel, and the filter element can abut against the step portion in the through hole;

[0018] And / or, the filter element and the through hole are interference fit.

[0019] In this solution, a step portion is provided in the through hole of the connector. When installing the filter element on the connector, it is only necessary to apply a certain external force to the filter element so that the filter element can abut against the step portion, thereby achieving installation of the filter element and the connector, which is more convenient and quick to operate. In addition, by providing an interference fit between the filter element and the through hole, the filter element can be more stably connected to the connector during blood drawing by medical staff.

[0020] Furthermore, the filter element is inserted into the collecting end of the tail needle, and a protective sleeve is provided on the periphery of the collecting end of the tail needle. The protective sleeve has an open end which is fixed on a part of the periphery of the filter element.

[0021] In this solution, the filter element is directly inserted into the collecting end of the tail needle, and the open end of the protective cover is fixed on the outer periphery of the filter element, so that part of the filter element is inside the protective cover and the other part is outside the protective cover. The internal gas of the flow channel passes through the tail needle and reaches the interior of the protective cover, and is discharged through the filter element, thereby satisfying the connection between the internal gas of the flow channel and the outside air, so that the blood can be extracted more smoothly.

[0022] Furthermore, the fixed blood sampling device also includes:

[0023] The needle seat has a first end that is sealedly inserted into the connector along the length of the flow channel, and a through hole is provided inside the needle seat along the length of the flow channel, and the fixed end of the blood collection needle is sealedly inserted into the second end of the needle seat.

[0024] In this solution, the blood collection needle and the connecting piece are connected to each other by setting a needle seat, wherein the fixed end of the blood collection needle is sealed and inserted into the second end of the needle seat, and the needle seat is connected to the blood collection needle and then sealed and inserted into the connecting piece together, so as to avoid the radial dimension of the blood collection needle being too small, resulting in insufficient connection strength between the blood collection needle and the connecting piece or failure to seal the connection.

[0025] Furthermore, the fixed blood collection device also includes a first sheath, and the end of the connecting piece for the needle seat to be inserted extends outward along the radial direction of the connecting piece to form an annular wall. The first sheath is arranged around the periphery of the blood collection needle and is interference-connected to the annular wall.

[0026] In this solution, one end of the connecting piece extends outward in its radial direction to form an annular wall, and then the first sheath is interference-connected to the outer periphery of the annular wall, so that the first sheath can wrap the blood collection needle to protect the blood collection needle when blood collection is not in progress to avoid contamination; when blood collection is required, the first sheath is removed relative to the blood collection needle. Due to the presence of the annular wall, the distance between the first sheath and the blood collection needle is increased to avoid mutual contact during the disassembly process.

[0027] Furthermore, the fixed blood collection device further includes a first pusher, which is connected to the needle seat and extends along the length direction of the flow channel from the connection between the first sheath and the annular wall to the outside of the first sheath;

[0028] The first pushing member is movable relative to the needle seat under the action of an external force, and drives the first sheath to separate from the annular wall during the movement.

[0029] In this solution, the part where the first pusher is connected to the needle seat is located inside the first sheath, and extends along the length direction of the flow channel from the connection between the first sheath and the annular wall to the outside of the first sheath. When the medical staff is drawing blood, they apply external force to the first pusher to move the first pusher relative to the needle seat, and drive the first sheath to separate from the annular wall during the movement. This arrangement makes it easier for the medical staff to operate the first pusher, thereby making it easier to remove the first sheath.

[0030] Furthermore, a pressing portion is provided at the end portion of the first pushing member extending toward the outside of the first sheath, and the pressing portion has a pressing surface that bears external force.

[0031] In this solution, by providing a pressing portion at the end of the first push member extending toward the outside of the first sheath, medical personnel can directly act on the pressing surface of the pressing portion, making it more convenient for medical personnel to apply force to the pressing portion to remove the sheath.

[0032] Furthermore, the fixed blood sampling device also includes:

[0033] At least one sliding member, each of the sliding members being cylindrical with both ends open and nested with each other;

[0034] The innermost sliding piece is nested in the periphery of the needle seat, and the innermost sliding piece can slide relative to the needle seat and between adjacent sliding pieces in the length direction of the flow channel.

[0035] In this solution, at least one sliding piece is nested on the periphery of the needle seat, and the sliding pieces located in the innermost layer can slide relative to the needle seat and the adjacent sliding pieces in the length direction of the flow channel. After the blood collection is completed, the medical staff can apply external force to these sliding pieces to make them slide relative to each other, so as to wrap the blood collection needle, avoid the blood collection needle being exposed to the outside and causing harm to the medical staff or others, and improve the safety of the blood collection device.

[0036] Furthermore, one end of the connector for inserting the needle seat extends outwardly in the radial direction of the connector to form an annular wall, and an annular accommodating cavity is formed between the annular wall and the connector;

[0037] When the slide and the needle seat are not sliding relative to each other, the end of the slide close to the connector is accommodated in the annular accommodating cavity, and the end of the slide away from the connector does not exceed the second end of the needle seat.

[0038] In this solution, an annular wall is provided on the periphery of the connecting piece, and an annular accommodating cavity is formed between the annular wall and the connecting piece to accommodate the sliding piece. During the blood collection process, medical staff can make the blood collection end of the blood collection needle pierce the patient's human vein through contact with the annular wall, thereby avoiding the accidental application of external force to the sliding piece, and further avoiding the sliding of the sliding piece relative to the needle seat during the blood collection process, which affects the normal blood collection process.

[0039] Furthermore, the fixed blood sampling device also includes:

[0040] The second sheath is provided with a fixed portion at the second end of the needle seat, the second sheath is sleeved on the outer periphery of the blood collection needle, and the second sheath has an open end sleeved on the fixed portion, and the sliding member can drive the second sheath to separate from the fixed portion during the process of sliding relative to the needle seat.

[0041] In this solution, a second sheath is provided on the periphery of the blood collection needle to protect the blood collection needle when blood collection is not being performed to avoid contamination; when blood collection is required, the second sheath is detached from the fixed part by sliding the slider relative to the needle seat, making the operation more convenient.

[0042] Furthermore, the sliding member located at the outermost layer is provided with a second pushing member on its outer wall. The second pushing member extends outward along the radial direction of the sliding member, and a pushing portion is provided at the end of the extension.

[0043] In this solution, a second pushing member is provided on the outer wall of the outermost sliding member, and a pushing portion is provided at the extended end of the second pushing member. When the medical staff is drawing blood, an external force is applied to the pushing portion of the second pushing member, so that the second pushing portion drives the sliding member to move, thereby making it easier to separate the second sheath from the fixed portion.

[0044] Furthermore, the needle seat and the slide are both provided with a limit slot at the end away from the connecting member, and the slide is both provided with a buckle at the end close to the connecting member. The buckle can be combined with the corresponding limit slot to limit the slide located in the innermost layer from sliding away from the needle seat, and the adjacent slides from sliding away from each other.

[0045] In this solution, by providing corresponding limit slots and buckles on the needle seat and each slide, it is prevented that the multiple slides are separated during the sliding process.

[0046] Furthermore, the longest dimension of at least one of the sliding members in the longitudinal direction of the flow channel is larger than the axial dimension of the lancet.

[0047] In this solution, after the medical staff completes blood collection by operating the fixed blood collection device, they can further push the multiple sliders so that the multiple sliders completely wrap the blood collection needle to prevent the blood collection needle from accidentally injuring the medical staff after the blood collection is completed.

[0048] The positive progress of this application is:

[0049] By arranging a filter element on the fixed blood collection device, the internal gas of the connector and the external air can be connected as needed, and the change in air pressure is used to promote the blood to be extracted more smoothly; when the medical staff uses the blood collection end of the blood collection needle to puncture the patient's human vein, the filter element has not yet come into contact with the blood, and the air pressure inside the connector is the same as the atmospheric pressure. Under the action of the air pressure, the patient's blood flows out more easily. When the filter element comes into contact with the blood, the internal gas of the connector is isolated from the external air by the filter element, and the blood flows through the connector. At the same time, the medical staff can know the blood flow by observing the transparent material connector, so that they can promptly pierce the protective cover and insert the collection end of the tail needle into the vacuum blood collection tube to complete the blood collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 is a schematic diagram of the overall structure of the fixed blood collection device in Example 1 of the present application.

[0051] Figure 2 is a schematic cross-sectional view of the overall structure of the fixed blood collection device in Example 1 of the present application.

[0052] Figure 3 is a schematic diagram of the overall structure of the fixed blood collection device in Example 1 of the present application; wherein the needle holder is hidden.

[0053] Figure 4 is a schematic diagram of the overall structure of the fixed blood collection device in Example 1 of the present application; wherein the needle holder and the protective cover are hidden.

[0054] Figure 5 is a schematic diagram of the connection and assembly of the blood collection needle, tail needle, connector, filter element and needle seat in Example 1 of the present application.

[0055] FIG6 is a schematic structural diagram of the pusher in Example 1 of the present application.

[0056] FIG7 is a schematic structural diagram of the connecting member in Example 1 of the present application.

[0057] FIG8 is a schematic cross-sectional view of the structure of the connector in Example 1 of the present application.

[0058] FIG9 is a schematic structural diagram of the inner layer sliding member in Example 1 of the present application.

[0059] FIG10 is a schematic structural diagram of the middle layer slide in Example 1 of the present application.

[0060] Figure 11 is a schematic structural diagram of the outer layer sliding member in Example 1 of the present application.

[0061] Figure 12 is a schematic diagram of the overall structure of the fixed blood collection device in Example 2 of the present application.

[0062] Figure 13 is a schematic cross-sectional view of the overall structure of the fixed blood collection device in Example 2 of the present application.

[0063] Figure 14 is a schematic diagram of the overall structure of the outer sliding member and the second pushing member in Example 2 of the present application.

[0064] Figure 15 is a schematic diagram of the overall structure of the fixed blood collection device in Example 3 of the present application.

[0065] Explanation of the accompanying drawings: lancet fixed end 110; lancet blood collection end 120; tail needle fixed end 210; sealing section 211; connecting section 212; tail needle collecting end 220; first sheath 11; needle holder 21; protective cover 22; connecting piece 30; annular wall 31; through hole 32; step portion 33; flow channel 34; filter element 40; needle seat 50; fixing portion 51; first pushing member 60; pressing portion 61; outer layer slide 71; middle layer slide 72; inner layer slide 73; buckle 74; limiting slot 75; second sheath 80; second pushing member 90; pushing portion 91; length direction H of the flow channel. DETAILED DESCRIPTION

[0066] The present application is further described below by way of examples, but the present application is not limited to the scope of the examples.

[0067] Example 1

[0068] This embodiment provides a fixed blood collection device, as shown in Figures 1, 2 and 3, the fixed blood collection device includes a blood collection needle, a tail needle and a connector 30 that connects and fixes the two, wherein the blood collection needle includes a blood collection needle fixed end 110 and a blood collection needle blood collection end 120, the tail needle includes a tail needle fixed end 210 and a tail needle collecting end 220, the material of the connector 30 is a transparent material, and a flow channel 34 is provided inside the connector 30, the blood collection needle fixed end 110 and the tail needle fixed end 210 are both sealed and fixed to the flow channel 34 of the connector 30, the blood collection needle blood collection end 120 and the tail needle collecting end 220 extend from the two ends of the flow channel 34 respectively, the blood collection needle blood collection end 120 is mainly used to puncture the patient's human vein, and the tail needle collecting end 220 is mainly used to connect to the vacuum blood collection tube.

[0069] In addition, a protective sleeve 22 is provided on the outer periphery of the tail needle collection end 220, and one end of the protective sleeve 22 is fixed to the connector 30. During the operation, the medical staff first uses the blood collection end 120 of the blood collection needle to puncture the patient's human vein, and then inserts the tail needle collection end 220 into the vacuum blood collection tube after puncturing the protective sleeve 22. The blood will pass through the blood collection needle, the flow channel 34 inside the connector 30, and the tail needle in sequence, and enter the interior of the vacuum blood collection tube, completing the blood collection. A needle holder 21 is also provided on the outer periphery of the tail needle collection end 220 and the protective sleeve 22. The needle holder 21 is a tubular wall structure with an opening, and one end of the needle holder 21 is also connected to the connector 30. The operator can directly hold the needle holder 21 during the blood collection process, thereby making blood collection more convenient. The structure and connection method of the needle holder 21 are existing technologies and will not be repeated here.

[0070] It should be noted that a flow channel 34 is provided inside the connector 30, and the longitudinal direction H of the flow channel is the flow direction of the blood. As shown in Figures 1 to 5, the fixed blood collection device also includes a filter element 40, which is provided on the connector 30. The filter element 40 can adjust the connection between the internal gas of the connector 30 and the external air, that is, the filter element 40 can adjust the connection between the flow channel 34 of the connector 30 and the outside world. When the filter element 40 is not in contact with liquid, the connection between the internal gas of the connector 30 and the external air is opened, and when the filter element 40 is in contact with liquid, the connection between the internal gas of the connector 30 and the external air is closed.

[0071] Specifically, when blood is collected from a patient, the blood must pass through the blood collection needle, the flow channel 34 of the connector 30, and the tail needle in sequence, and finally enter the interior of the vacuum blood collection tube. Therefore, the fixed end 110 of the blood collection needle and the flow channel 34 of the connector 30, as well as the flow channel 34 of the connector 30 and the fixed end 210 of the tail needle are interconnected. The outer sleeve of the tail needle collecting end 220 is provided with a protective sleeve 22. Therefore, when the tail needle collecting end 220 is not connected to the vacuum blood collection tube, it is in a sealed state due to the action of the protective sleeve 22. At this time, if the blood collection end 120 of the blood collection needle is directly punctured into the patient's human vein, the blood may not flow out due to air pressure. In this case, a filter element 40 is provided on the connector 30. The overall structure of the filter element 40 is a cylindrical structure. When the filter element 40 is not in contact with liquids such as blood, it has a certain air permeability function. When the filter element 40 comes into contact with liquids such as blood, its internal structure automatically changes, causing it to lose its air permeability function. The specific structure and material of the filter element 40 belong to the prior art and will not be described in detail here.

[0072] After the filter element 40 is set on the connector 30, the internal gas of the connector 30 and the outside air can be connected as needed, and the change in air pressure is used to promote the blood to be extracted more smoothly; when the medical staff punctures the patient's human vein with the blood collection end 120 of the blood collection needle, the filter element 40 has not yet come into contact with the blood, and the air pressure inside the connector 30 is the same as the atmospheric pressure, making it easier for the patient's blood to flow out. When the filter element 40 comes into contact with the blood, the internal gas of the connector 30 is isolated from the outside air by the filter element 40, and the blood flows through the connector 30. Since the material of the connector 30 is set to be transparent, the medical staff can observe the blood flow inside the connector 30 through the transparent connector 30, so as to promptly pierce the protective cover 22 and insert the tail needle collection end 220 into the vacuum blood collection tube to complete the blood collection.

[0073] As shown in Figures 7 and 8 , a through hole 32 is provided on the side wall of the connector 30. The through hole 32 is connected to the flow channel 34 inside the connector 30. The filter element 40 is cooperatively disposed in the through hole 32. Compared to disposing the filter element 40 at other locations on the connector 30, or disposing the filter element 40 on the connector 30 through other connection methods, this method can more conveniently utilize the through hole 32 to connect the internal gas of the connector 30 with the external air, and utilize the filter element 40 to adjust the connection relationship. Specifically, the filter element 40 has an interference fit within the through hole 32 and between the through hole 32, so that the filter element 40 can be more stably connected to the side wall of the connector 30 during the blood drawing process by medical personnel. In addition, the through hole 32 is further provided with a step portion 33 at one end of the communicating channel near the connecting piece 30. The filter element 40 is interference fit in the through hole 32 and can abut against the step portion 33. When installing the filter element 40 on the connecting piece 30, it is only necessary to apply a certain external force to the filter element 40 so that the filter element 40 can abut against the step portion 33, thereby realizing the installation of the filter element 40 and the connecting piece 30, which is more convenient and quick in operation.

[0074] As shown in Figures 2 and 8, in the longitudinal direction H of the flow channel inside the connector 30, the position of the filter element 40 on the connector 30 is located between the blood collection needle fixed end 110 and the tail needle fixed end 210. That is, when blood is drawn from a patient, blood enters through the blood collection needle blood collection end 120 and flows out from the blood collection needle fixed end 110, and then directly reaches the position of the connector 30, so that the connector 30 contacts the blood and seals the connection between the flow channel 34 of the connector 30 and the outside world. When the connection between the flow channel 34 of the connector 30 and the outside world is sealed, the blood can enter the tail needle fixed end 210 and eventually flow out from the tail needle collection end 220 and be collected into the vacuum blood collection tube. Through this arrangement, when the filter element 40 is arranged in the side wall through hole 32 of the connector 30, the through hole 32 where the filter element 40 is placed can be directly connected to the flow channel 34, which is more convenient for the internal gas of the connector 30 to communicate with the outside air, thereby allowing blood to be drawn more smoothly.

[0075] As shown in Figures 2 and 5, the fixed blood collection device also includes a needle hub 50, through which the fixed end 110 of the blood collection needle is connected to the connector 30. This is because the radial dimension of the blood collection needle is too small. If the fixed end 110 of the blood collection needle is directly connected and fixed to the connector 30, it is not conducive to the fixation and sealing between the blood collection needle and the connector 30. The fixed blood collection device is provided with a needle hub 50. The first end of the needle hub 50 is sealedly inserted into the connector 30 along the longitudinal direction H of the flow channel. The needle hub 50 has a through hole formed therein along the longitudinal direction H of the flow channel. The fixed end 110 of the blood collection needle is sealedly inserted into the second end of the needle hub 50, and the blood collection needle is connected to the through hole in the needle hub 50. This configuration avoids the situation where the radial dimension of the blood collection needle is too small, resulting in insufficient connection strength or a failure to seal the fixed end 110 between the blood collection needle and the connector 30.

[0076] As shown in Figures 4, 5, 7 and 8, the connector 30 has an annular wall 31 extending outwardly along the radial direction of the connector 30 at the end where the needle holder 50 is inserted, and an annular accommodating cavity is formed between the annular wall 31 and the connector 30. In this embodiment, the annular wall 31 is directly integrally formed with the connector 30, but in other embodiments, the annular wall 31 and the connector 30 can be completely separate. As shown in Figures 1, 2 and 3, the fixed blood collection device also includes a first sheath 11. The first sheath 11 is a tubular wall-like structure with one end open. The first sheath 11 is sleeved on the periphery of the blood collection needle, and the open end of the first sheath 11 is interference-connected to the periphery of the annular wall 31. This arrangement allows the first sheath 11 to encase the lancet, protecting it from contamination when blood is not being drawn. When blood is drawn, the first sheath 11 is removed from the lancet. The presence of the annular wall 31 increases the distance between the first sheath 11 and the lancet, preventing contact during removal. As shown in FIG7 , along the longitudinal direction H of the flow channel, the annular wall 31 and the through hole 32 for the filter element 40 are spaced apart on the connector 30, preventing potential contact and interference between the first sheath 11 and the filter element 40.

[0077] As shown in Figures 1 to 4, the fixed blood collection device also includes a first pusher 60. As shown in Figure 6, the first pusher 60 has an annular fixing portion 51, which is connected to the periphery of the needle hub 50 via the annular fixing portion 51. The first pusher 60 also has an extension portion, which is connected to the annular fixing portion 51 and extends along the length direction H of the flow channel from the connection between the first sheath 11 and the annular wall 31 to the outside of the first sheath 11. The first pusher 60 as a whole can move relative to the needle hub 50 under the action of an external force. During movement, the first pusher 60 uses its extension portion to abut against the first sheath 11, forcing the first sheath 11 away from the annular wall 31. With this arrangement, when the medical staff is drawing blood, they can apply a slight external force to the first pusher 60 to move the first pusher 60 relative to the needle seat 50, and during the movement, the first sheath 11 is driven away from the annular wall 31, making it easier for the medical staff to operate the first pusher 60 and thus more convenient to remove the first sheath 11. Furthermore, the first pusher 60 is further provided with a pressing portion 61 at the end of the extension portion. The pressing portion 61 is located outside the first sheath 11 and has a pressing surface. The pressing surface is adapted to the shape of the operator's thumb, so that the operator's thumb can fit on the pressing surface and then apply force to the pressing portion 61, making it easier to push the first pusher 60 as a whole and making it easier for the medical staff to remove the first sheath 11.

[0078] As shown in Figures 2, 9, 10, and 11, the fixed blood collection device further includes three sliders: an outer slider 71, a middle slider 72, and an inner slider 73. Each slider is a cylindrical structure with open ends and nests within one another. The inner slider 73 nests within the periphery of the needle holder 50, and the first pusher 60 is fixedly connected to the outer slider 71. The inner slider 73 and adjacent sliders can slide relative to the needle holder 50 along the longitudinal direction H of the flow channel. This arrangement facilitates movement of the first pusher 60 relative to the needle holder 50 along the longitudinal direction H of the flow channel, thereby driving the first sheath 11 away from the annular wall 31. It should be noted that in this embodiment, the number of sliders is set to three, and the three sliders are nested within one another. However, in other embodiments, the number of sliders can be set to any other number. The optimal setting is that the number of sliders is set corresponding to the length of the blood collection needle. When the length of each slider and the blood collection needle is certain, by adjusting the number of sliders, the medical staff can push the nested sliders to make the sliders slide against each other after the blood collection is completed, thereby completely wrapping the blood collection needle and preventing the used blood collection needle from accidentally injuring the medical staff or other personnel.

[0079] As shown in Figures 2, 4, and 8, the connector 30 has an annular wall 31 extending radially outward from the end into which the needle hub 50 is inserted, forming an annular accommodating cavity between the annular wall 31 and the connector 30. When not sliding against each other, the three sliders are nested within each other, meaning that the ends of the three sliders proximal to the connector 30 are all contained within the annular accommodating cavity, and the ends of the three sliders distal to the connector 30 do not extend beyond the second end of the needle hub 50. With this arrangement, when medical personnel need to remove the first sheath 11, they only need to apply a small force to the first pusher 60 to slide the outer slider 71. At this point, the ends of the other sliders proximal to the connector 30 remain contained within the annular accommodating cavity, and the end of the outer slider 71 distal to the connector 30 does not extend excessively beyond the second end of the needle hub 50, preventing the sliders from interfering with the blood collection needle when it punctures a patient's vein. In addition, by providing an annular wall 31 on the periphery of the connecting member 30 and forming an annular accommodating cavity between the annular wall 31 and the connecting member 30 to accommodate the sliding member, medical staff can make the blood collection end of the blood collection needle pierce the patient's human vein through contact with the annular wall 31 during the blood collection process, thereby avoiding the accidental application of external force to the sliding member, and further avoiding the sliding of the sliding member relative to the needle seat 50 during the blood collection process, which affects the normal blood collection process.

[0080] As shown in Figures 5, 9, 10, and 11, the needle hub 50, the inner slider 73, and the middle slider 72 are each provided with a limit slot 75 at the end away from the connector 30. Furthermore, the inner slider 73, the middle slider 72, and the outer slider 71 are each provided with a buckle 74 at the end near the connector 30. The buckle 74 engages with the corresponding limit slot 75 to limit the inner slider 73 from sliding away from the needle hub 50, and to limit the sliding of the multiple sliders from one another. When the buckles 74 on the three sliders engage with the corresponding limit slots 75, the three sliders are at their longest length in the longitudinal direction H of the flow channel. At this point, the total length of the three sliders in this direction is greater than the axial dimension of the lancet, allowing the multiple sliders to completely enclose the lancet, preventing the lancet from accidentally injuring medical personnel after blood collection.

[0081] Example 2

[0082] This embodiment also provides a fixed blood collection device, whose main structure is similar to that of the fixed blood collection device in Example 1. As shown in Figures 12 and 13, the filter element 40 of the fixed blood collection device in this embodiment is also disposed within a through hole on the side wall of the connector 30, and the through hole is also connected to the flow channel. However, the manner in which the filter element 40 communicates with the flow channel within the through hole is different from that in Example 1. The following describes in detail only the differences from Example 1.

[0083] As shown in FIG13 , the outer periphery of the tail needle collecting end 220 is provided with a protective sleeve 22, which is connected to the connector 30 and wraps the tail needle collecting end 220 when the tail needle collecting end 220 is not connected to the vacuum blood collection tube. In addition, the tail needle fixed end 210 is fixed in the flow channel of the connector 30 and is divided into a sealing section 211 and a connecting section 212 in the longitudinal direction of the flow channel. The sealing section 211 is arranged relatively close to the blood collection needle fixed end 110, and the connecting section 212 is arranged relatively far away from the blood collection needle fixed end 110. The tail needle fixed end 210 is fixed in the flow channel by the sealing section 211. For example, a sealant can be provided on the periphery of the sealing section 211 to seal and fix it to the flow channel. The outer wall of the connecting section 212 has a gap between it and the connector 30 in the flow channel, and the filter element 40 is arranged on the connector 30 corresponding to the connecting section 212.

[0084] When blood is drawn from a patient, blood enters from the blood collection end 120 of the blood collection needle, passes through the blood collection needle, and flows out from the fixed end 110 of the blood collection needle to the flow channel of the connector 30. During this process, the gas inside the flow channel can be discharged from the tail needle collecting end 220 through the tail needle fixed end 210. Since a protective cover 22 is provided on the periphery of the tail needle at this time, the gas discharged from the tail needle collecting end 220 will flow from the gap between the tail needle and the protective cover 22 to the connecting section 212 of the tail needle fixed end 210, and finally be discharged from the filter element 40 at the connecting section 212. Through this arrangement, when blood is first drawn from a patient, the flow channel can still be connected to the outside world through the filter element 40, and the change in air pressure can be used to promote smoother extraction of blood; when the medical staff observes the blood at the connector 30, they can pierce the protective cover 22 with the tail needle as needed and insert it into the vacuum tube collection tube. At this time, the blood can directly enter the vacuum tube collection tube through the tail needle collecting end 220, thereby successfully completing the blood collection.

[0085] As shown in FIG13 , the fixed blood collection device also has a needle holder 50 fixedly provided around the fixed end 110 of the blood collection needle. The first end of the needle holder 50 is sealed and inserted into the connector 30 along the length of the flow channel, and the needle holder 50 has a through hole formed inside it along the length of the flow channel. The fixed end 110 of the blood collection needle is sealed and inserted into the second end of the needle holder 50, and the blood collection needle is connected to the through hole inside the needle holder 50. In addition, a fixing portion 51 is provided at the end of the second end of the blood collection needle. The fixed blood collection device is provided with a second sheath 80, which is sleeved around the periphery of the blood collection needle. One end of the second sheath 80 with an opening is sleeved on the fixing portion 51. When the sliding member around the needle holder 50 slides relative to the needle holder 50, the second sheath 80 can be driven to separate from the fixing portion 51. By setting a second sheath 80 on the periphery of the blood collection needle, the blood collection needle can be protected when blood collection is not in progress to avoid contamination; when blood collection is required, the sliding piece is used to slide relative to the needle seat 50 to separate the second sheath 80 from the fixed part 51, making the operation more convenient.

[0086] As shown in Figures 13 and 14, in this embodiment, two layers of sliders are disposed around the periphery of the needle hub 50. An inner slider 73 is sleeved onto the needle hub 50, and a second pusher 90 is disposed on the outer wall of the outer slider 71. The second pusher 90 extends outward in the radial direction of the slider and has a pusher portion 91 disposed at the end of the extension. With this arrangement, when performing blood collection, medical personnel can apply external force to the pusher portion 91 of the second pusher 90, causing the second pusher portion 91 to drive the slider to move, thereby more conveniently separating the second sheath 80 from the fixed portion 51.

[0087] Example 3

[0088] This embodiment also provides a fixed blood collection device, whose main structure is similar to the fixed blood collection device in Example 2. However, the setting position of the filter element 40 in this embodiment and the communication method between the internal flow channel of the connector 30 and the outside world are different from those in Example 2. As shown in Figure 15, in this embodiment, the filter element 40 is inserted into the tail needle collecting end 220 and abuts against the connector 30. A protective sleeve 22 is provided on the periphery of the tail needle collecting end 220. The protective sleeve 22 has an open end that is fixed on part of the periphery of the filter element 40, so that a part of the filter element 40 is inside the protective sleeve 22 and the other part is outside the protective sleeve 22. The internal gas of the flow channel enters the interior of the tail needle through the tail needle fixed end 210, and then is discharged through the tail needle collecting end 220 to reach the interior of the protective sleeve 22, and then is discharged through the filter element 40, thereby satisfying the communication between the internal gas of the flow channel and the outside air, so that blood can be extracted more smoothly.

[0089] Although the above describes specific embodiments of the present application, those skilled in the art will appreciate that these are merely illustrative and that various changes or modifications may be made to these embodiments without departing from the principles and essence of the present application. Therefore, the scope of protection of this application is defined by the appended claims.

Claims

1. A fixed blood collection device, comprising a blood collection needle, a tail needle and a connector, characterized in that: The connecting piece is made of a transparent material, and a flow channel is provided inside the connecting piece. The fixed end of the blood collection needle and the fixed end of the tail needle are both sealed and fixed in the flow channel. The fixed blood collection device also includes a filter element, which can adjust the communication relationship between the internal gas of the connecting part and the external air; wherein, when the filter element is not in contact with liquid, the communication relationship between the internal gas of the connecting part and the external air is opened, and when the filter element is in contact with liquid, the communication relationship between the internal gas of the connecting part and the external air is closed.

2. The fixed blood collection device according to claim 1, characterized in that: A through hole is provided on the side wall of the connecting member, the through hole is communicated with the flow channel, and the filter element is arranged in cooperation with the interior of the through hole.

3. The fixed blood collection device according to claim 2, characterized in that: Along the length direction of the flow channel, the position of the filter element on the connecting piece is located between the fixed end of the blood collection needle and the fixed end of the tail needle.

4. The fixed blood collection device according to claim 2, wherein: The tail needle is also sealed with a protective sleeve on the periphery of its collecting end; The fixed end of the tail needle includes a sealing section and a connecting section along the length direction of the flow channel. The sealing section is arranged close to the fixed end of the blood collection needle. The fixed end of the tail needle is sealed and fixed in the flow channel through the sealing section. The outer wall of the connecting section has a gap between the flow channel and the connecting piece, and the filter element is arranged on the connecting piece corresponding to the connecting section.

5. The fixed blood collection device according to claim 2, wherein: The through hole is provided with a step portion at one end close to the flow channel, and the filter element can abut against the step portion in the through hole; And / or, the filter element and the through hole are interference fit.

6. The fixed blood collection device according to at least one of claims 1 to 5, characterized in that: The filter element is passed through the collecting end of the tail needle, and a protective sleeve is provided on the periphery of the collecting end of the tail needle. The protective sleeve has an open end which is sleeved and fixed on a part of the periphery of the filter element.

7. The fixed blood collection device according to at least one of claims 1 to 6, characterized in that: The fixed blood sampling device also includes: The needle seat has a first end that is sealedly inserted into the connector along the length of the flow channel, and a through hole is provided inside the needle seat along the length of the flow channel, and the fixed end of the blood collection needle is sealedly inserted into the second end of the needle seat.

8. The fixed blood collection device according to claim 7, characterized in that: The fixed blood collection device also includes a first sheath. The end of the connector for inserting the needle seat extends outward in the radial direction of the connector to form an annular wall. The first sheath surrounds the periphery of the blood collection needle and is interference-connected to the annular wall.

9. The fixed blood collection device according to claim 8, characterized in that: The fixed blood collection device further includes a first pusher connected to the needle seat and extending along the length direction of the flow channel from the connection between the first sheath and the annular wall to the outside of the first sheath; The first pushing member is movable relative to the needle seat under the action of an external force, and drives the first sheath to separate from the annular wall during the movement.

10. The fixed blood collection device according to claim 9, characterized in that: A pressing portion is provided at the end portion of the first pushing member extending toward the outside of the first sheath. The pressing portion has a pressing surface that bears external force.

11. The fixed blood collection device according to at least one of claims 7 to 10, characterized in that: The fixed blood sampling device also includes: At least one sliding member, each of the sliding members being cylindrical with both ends open and nested with each other; The innermost sliding piece is nested in the periphery of the needle seat, and the innermost sliding piece can slide relative to the needle seat and between adjacent sliding pieces in the length direction of the flow channel.

12. The fixed blood collection device according to claim 11, wherein: An end of the connector for inserting the needle seat extends outwardly in the radial direction of the connector to form an annular wall, and an annular accommodating cavity is formed between the annular wall and the connector; When the slide and the needle seat are not sliding relative to each other, the end of the slide close to the connector is accommodated in the annular accommodating cavity, and the end of the slide away from the connector does not exceed the second end of the needle seat.

13. The fixed blood collection device according to claim 11, wherein: The fixed blood sampling device also includes: The second sheath is provided with a fixed portion at the second end of the needle seat, the second sheath is sleeved on the outer periphery of the blood collection needle, and the second sheath has an open end sleeved on the fixed portion, and the sliding member can drive the second sheath to separate from the fixed portion during the process of sliding relative to the needle seat.

14. The fixed blood collection device according to claim 13, wherein: The sliding member located at the outermost layer is provided with a second pushing member on its outer wall. The second pushing member extends outward along the radial direction of the sliding member and is provided with a pushing portion at the end of the extension.

15. The fixed blood collection device according to claim 11, wherein: The needle seat and the slide are both provided with a limit slot at the end away from the connecting member, and the slide is both provided with a buckle at the end close to the connecting member. The buckle can be combined with the corresponding limit slot to limit the slide located in the innermost layer from sliding away from the needle seat, and the adjacent slides from sliding away from each other.

16. The fixed blood collection device according to claim 15, wherein: The longest dimension of at least one of the sliders in the longitudinal direction of the flow channel is larger than the axial dimension of the lancet.

Images