Fixed blood sampling device

Abstract

The utility model discloses a fixed blood sampling device, and relates to the technical field of medical blood sampling. The fixed blood sampling device comprises a blood sampling needle, a tail needle, a connecting piece and a filter element, the connecting piece is made of a transparent material, a flowing channel is formed in the connecting piece, the fixed ends of the blood sampling needle and the tail needle are fixed to the flowing channel in a sealed mode, and the filter element can adjust the communication relation between internal air of the connecting piece and external air; when the filter element does not make contact with liquid, the communication relation between internal gas of the connecting piece and external air is opened, blood of a patient can flow out more easily under the action of atmospheric pressure, when the filter element makes contact with the liquid, the communication relation between the internal gas of the connecting piece and the external air is closed, and the blood flows through the connecting piece; meanwhile, medical staff can know the flowing condition of the blood by observing the connecting piece made of the transparent material, and the collecting end of the tail needle punctures the protective sleeve in time and then is inserted into the vacuum blood collecting tube, so that the blood collection is completed.

Description

[0001] The present application claims priority to the patent application with the application date of April 2, 2024, the international application number of PCT / CN2024 / 085660, and the invention name of "Fixed blood collection device". TECHNICAL FIELD

[0002] The utility model relates to medical blood collection technical field, especially a kind of fixed blood collection device. BACKGROUND

[0003] Venipuncture is the main method for obtaining blood samples, and a fixed blood collection device is often used during venipuncture. The existing fixed blood collection device generally includes a blood collection needle, a tail needle, and a connecting member connecting the two. The fixed end of the blood collection needle and the fixed end of the tail needle are both fixed inside the connecting member. The blood collection end of the blood collection needle and the collection end of the tail needle extend out from both ends of the connecting member. The tail needle is generally provided with a protective sleeve around the collection end. During the operation, the medical staff first uses the blood collection end of the blood collection needle to pierce the patient's vein, then inserts the collection end of the tail needle into the vacuum blood collection tube after piercing the protective sleeve, and the blood flows through the blood collection needle, the connecting member, and the tail needle into the vacuum blood collection tube, completing the blood collection.

[0004] However, during the actual blood collection process, the medical staff often encounters situations where the patient's blood pressure is not sufficient or the puncture position is not appropriate, resulting in the patient's blood not flowing out. The speed of blood flow may also vary for different patients in different situations. This makes it difficult for medical staff to determine when to insert the collection end of the tail needle into the vacuum blood collection tube, which is inconvenient for medical staff and may also increase the patient's pain. SUMMARY

[0005] The utility model solves the technical problem of overcoming the defects of the prior art that the patient's blood is not easy to flow out and the medical staff cannot quickly see the backflow of blood, and provides a fixed blood collection device.

[0006] The utility model solves the above technical problems by the following technical solutions:

[0007] A fixed blood collection device includes a blood collection needle, a tail needle, and a connecting member. The connecting member is made of transparent material. The connecting member has a flow channel inside. 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.

[0008] The fixed blood sampling device further comprises a filter core, which adjusts the communication relationship between the internal gas of the connecting member and the external air; wherein when the filter core does not contact liquid, the communication relationship between the internal gas of the connecting member and the external air is opened, and when the filter core contacts liquid, the communication relationship between the internal gas of the connecting member and the external air is closed.

[0009] In the scheme, the filter core is arranged on the fixed blood sampling device, so that the internal gas of the connecting member and the external air can be communicated as needed, and the blood is more smoothly drawn out by using the change of air pressure; when the medical staff uses the blood sampling end of the blood sampling needle to pierce the patient's vein, the filter core has not contacted blood, the air pressure in the connecting member is the same as the atmospheric pressure, and the blood of the patient is more easily flowed out under the action of the air pressure; when the filter core contacts blood, the internal gas of the connecting member and the external air are isolated by the filter core, the blood flows through the connecting member, and at the same time, the medical staff can know the flow condition of the blood by observing the connecting member made of transparent material, so as to timely insert the collection end of the tail needle into the vacuum blood collection tube after the protective sleeve is pierced, thereby completing the blood collection.

[0010] Further, a through hole is arranged on the side wall of the connecting member, which is communicated with the flow channel, and the filter core is arranged in the through hole.

[0011] In the scheme, the through hole communicated with the flow channel is arranged on the side wall of the connecting member, and the filter core is arranged in the through hole, so that the internal gas of the connecting member and the external air are directly communicated through the through hole, and the filter core is used to adjust the communication relationship.

[0012] Further, along the length direction of the flow channel, the position of the filter core on the connecting member is between the fixed end of the blood sampling needle and the fixed end of the tail needle.

[0013] In the scheme, when the filter core is arranged in the through hole of the side wall of the connecting member, the position of the filter core on the connecting member is between the fixed end of the blood sampling needle and the fixed end of the tail needle, so that the through hole in which the filter core is arranged can be directly communicated with the flow channel, the internal gas of the connecting member and the external air are more conveniently communicated, and the blood is more smoothly drawn out.

[0014] Further, the protective sleeve is further arranged on the periphery of the collection end of the tail needle.

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

[0016] In the present scheme, when the filter core is arranged in the side wall through hole of the connecting piece, the protective sleeve is arranged peripherally on the collection end of the tail needle, the fixed end of the tail needle is provided with the sealing section and the communicating section, and the filter core is arranged on the connecting piece corresponding to the communicating section, so that the internal gas of the flow channel reaches the inside of the protective sleeve after passing through the tail needle, and then reaches the position of the filter core after passing through the communicating section of the tail needle, thereby satisfying the communication between the internal gas of the flow channel and the external air, so that the blood is more smoothly extracted.

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

[0018] And / or, the filter core is in interference fit with the through hole.

[0019] In the present scheme, by arranging the step portion in the through hole of the connecting piece, when the filter core is installed on the connecting piece, only a certain external force needs to be applied to the filter core, and the filter core can abut against the step portion, so that the installation of the filter core and the connecting piece is realized, and the operation is more convenient and fast. In addition, by interference fit between the filter core and the through hole, the filter core is more stably connected to the connecting piece during blood extraction by medical staff.

[0020] Further, the filter core is arranged on the collection end of the tail needle, and the tail needle is further provided with a protective sleeve peripherally on the collection end, and the protective sleeve has an open end fixedly sleeved on part of the periphery of the filter core.

[0021] In the present scheme, by arranging the filter core directly on the collection end of the tail needle, and sleeving and fixing the open end of the protective sleeve on the periphery of the part of the filter core, part of the filter core is inside the protective sleeve, and part of the filter core is outside the protective sleeve, the internal gas of the flow channel reaches the inside of the protective sleeve after passing through the tail needle, and is discharged through the filter core, thereby satisfying the communication between the internal gas of the flow channel and the external air, so that the blood is more smoothly extracted.

[0022] Further, the fixed blood taking device further comprises:

[0023] A needle seat is sealingly inserted into the connecting piece along the length direction of the flow channel, and a through hole is formed in the needle seat along the length direction of the flow channel.

[0024] In the present solution, the blood taking needle and the connecting piece are connected by the needle seat, the fixed end of the blood taking needle is sealingly inserted into the second end of the needle seat, and the needle seat and the blood taking needle are sealingly inserted into the connecting piece together, so that the radial size of the blood taking needle is not too small, and the connection strength of the blood taking needle and the connecting piece is sufficient or the blood taking needle and the connecting piece can be sealingly connected.

[0025] Further, the fixed blood taking device further comprises a first sheath, an end of the connecting piece, into which the needle seat is inserted, extends outward along the radial direction of the connecting piece to form an annular wall, and the first sheath is arranged around the blood taking needle and is connected to the annular wall in an interference fit.

[0026] In the present solution, an end of the connecting piece extends outward along the radial direction thereof to form an annular wall, and the first sheath is connected to the outer periphery of the annular wall in an interference fit, so that the first sheath can wrap the blood taking needle, and the blood taking needle is protected from being contaminated when blood is not taken; when blood is taken, the first sheath is detached from the blood taking needle, and the annular wall expands the distance between the first sheath and the blood taking needle, so that the blood taking needle and the first sheath do not touch each other during the detaching process.

[0027] Further, the fixed blood taking device further comprises a first push member, the first push member is connected to the needle seat and extends from the connection between the first sheath and the annular wall to the outside of the first sheath along the length direction of the flow channel.

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

[0029] In the present solution, the part of the first push member connected to the needle seat is located inside the first sheath, and the first push member extends from the connection between the first sheath and the annular wall to the outside of the first sheath along the length direction of the flow channel; when blood is taken, a medical worker applies an external force to the first push member, so that the first push member moves relative to the needle seat, and the first sheath is detached from the annular wall during the movement of the first push member; this arrangement makes it more convenient for the medical worker to operate the first push member, and thus the first sheath is more easily detached.

[0030] Further, an end of the first push member extending to the outside of the first sheath is provided with a pressing portion, and the pressing portion has a pressing surface bearing the external force.

[0031] In the scheme, by setting a pressing part at the end of the first pushing part extending to the outside of the first sheath, the medical staff can directly act on the pressing surface of the pressing part, more conveniently exerting force on the pressing part, so that the sheath is disassembled.

[0032] Further, the fixed blood sampling device further comprises:

[0033] At least one slide, which is a cylindrical with both ends open and nested with each other;

[0034] Among them, the innermost slide is nested on the periphery of the needle holder, and the innermost slide is relative to the needle holder and the adjacent slide, and can slide in the length direction of the flow channel.

[0035] In the scheme, by nesting at least one slide on the periphery of the needle holder, and the innermost slide relative to the needle holder and the adjacent slide, can slide in the length direction of the flow channel, so that the medical staff can exert external force on the slides after blood sampling to make them slide relative to each other, to realize the wrapping of the blood sampling needle, avoid the exposure of the blood sampling needle to the outside to cause harm to the medical staff or others, and improve the safety of the blood sampling device.

[0036] Further, the end of the connecting piece for inserting the needle holder extends outward along the radial direction of the connecting piece to form an annular wall, and an annular accommodating cavity is formed between the annular wall and the connecting piece;

[0037] When the slides and the needle holder are not sliding relative to each other, the end of the slide close to the connecting piece is accommodated inside the annular accommodating cavity, and the end of the slide away from the connecting piece does not exceed the second end of the needle holder.

[0038] In the scheme, by setting an annular wall on the periphery of the connecting piece, and using the annular accommodating cavity formed between the annular wall and the connecting piece to accommodate the slide, the medical staff can make the blood sampling end of the blood sampling needle pierce the patient's vein by contacting the annular wall during blood sampling, thereby avoiding the misapplication of external force to the slide, and further avoiding the slide relative to the needle holder during blood sampling, affecting the normal blood sampling process.

[0039] Further, the fixed blood sampling device further comprises:

[0040] A second sheath, the second end of the needle holder is provided with a fixed part, the second sheath is sleeved on the periphery of the blood sampling needle, the second sheath has an open end sleeved on the fixed part, and the slide can drive the second sheath to separate from the fixed part during mutual sliding relative to the needle holder.

[0041] In the scheme, the second sheath is arranged on the periphery of the blood taking needle to protect the blood taking needle when blood is not taken, and avoid pollution; when blood is taken, the second sheath is separated from the fixed part by sliding the slide relative to the needle holder, which is more convenient to operate.

[0042] Further, the slide at the outermost layer is provided with a second pushing member on the outer wall, the second pushing member extends outward along the radial direction of the slide, and the extending end is provided with a pushing part.

[0043] In the scheme, the second pushing member is arranged on the outer wall of the slide at the outermost layer, and the extending end of the second pushing member is provided with a pushing part, so that the second pushing part drives the slide to move when the medical staff pushes the pushing part of the second pushing member during blood taking, so that the second sheath is separated from the fixed part.

[0044] Further, the needle holder and the slide are provided with a limiting clamping groove at one end away from the connecting piece, and the slide is provided with a buckle at one end close to the connecting piece, the buckle can be combined with the corresponding limiting clamping groove to limit the slide at the innermost layer to slide away from the needle holder, and the adjacent slides to slide away from each other.

[0045] In the scheme, the limiting clamping groove and the buckle are arranged on the needle holder and each slide correspondingly, so that the multiple slides are prevented from being separated during mutual sliding.

[0046] Further, the longest dimension of at least one slide in the length direction of the flow channel is greater than the axial dimension of the blood taking needle.

[0047] In the scheme, when the medical staff operates the fixed blood taking device to complete blood taking, the multiple slides can be further pushed to completely wrap the blood taking needle, so that the medical staff is prevented from being injured by the blood taking needle after blood taking.

[0048] The positive progress effect of the utility model lies in:

[0049] By setting the filter core on the fixed blood sampling device, the inside gas of the connecting piece and the outside air can be communicated according to the requirement, and the blood is more smoothly drawn out by the change of the air pressure; when the medical staff uses the blood sampling needle to pierce the patient's vein, the filter core does not contact the blood, the air pressure in the connecting piece is the same as the atmospheric pressure, and the blood of the patient is more easily flowed out under the action of the air pressure; when the filter core contacts the blood, the inside gas of the connecting piece is isolated from the outside air by the filter core, the blood flows through the connecting piece, and at the same time, the medical staff can know the flowing condition of the blood by observing the connecting piece made of transparent material, so that the collecting end of the tail needle is inserted into the vacuum blood collecting tube after the protective sleeve is pierced, so that the blood collection is completed. BRIEF DESCRIPTION OF DRAWINGS

[0050] Figure 1 It is the overall structure schematic view of the fixed blood sampling device in the embodiment 1 of the utility model.

[0051] Figure 2 It is the overall structure section view schematic view of the fixed blood sampling device in the embodiment 1 of the utility model.

[0052] Figure 3 It is the overall structure schematic view of the fixed blood sampling device in the embodiment 1 of the utility model; wherein, the needle holder is hidden.

[0053] Figure 4 It is the overall structure schematic view of the fixed blood sampling device in the embodiment 1 of the utility model; wherein, the needle holder and the protective sleeve are hidden.

[0054] Figure 5 It is the connection assembly schematic view of the blood sampling needle, the tail needle, the connecting piece, the filter core and the needle seat in the embodiment 1 of the utility model.

[0055] Figure 6 It is the structure schematic view of the pushing piece in the embodiment 1 of the utility model.

[0056] Figure 7 It is the structure schematic view of the connecting piece in the embodiment 1 of the utility model.

[0057] Figure 8 It is the structure section schematic view of the connecting piece in the embodiment 1 of the utility model.

[0058] Figure 9 It is the structure schematic view of the inner layer sliding piece in the embodiment 1 of the utility model.

[0059] Figure 10 It is the structure schematic view of the middle layer sliding piece in the embodiment 1 of the utility model.

[0060] Figure 11 It is the structure schematic view of the outer layer sliding piece in the embodiment 1 of the utility model.

[0061] Figure 12 It is the whole structure schematic view of the fixed blood sampling device in the embodiment 2 of the utility model.

[0062] Figure 13 It is the whole structure section schematic view of the fixed blood sampling device in the embodiment 2 of the utility model.

[0063] Figure 14 It is the whole structure schematic view of the outer slide and the second pusher in the embodiment 2 of the utility model.

[0064] Figure 15 It is the whole structure schematic view of the fixed blood sampling device in the embodiment 3 of the utility model.

[0065] Mark explanation:

[0066] Blood sampling needle fixed end 110;Blood sampling needle blood sampling end 120;Tail needle fixed end 210;Sealing section 211;Communication section 212;Tail needle collection end 220;First sheath 11;Needle holder 21;Protective sleeve 22;Connecting piece 30;Annular wall 31;Through hole 32;Step part 33;Flow channel 34;Filter element 40;Needle seat 50;Fixed part 51;First pusher 60;Pressing part 61;Outer slide 71;Middle slide 72;Inner slide 73;Buckle 74;Limiting clamping groove 75;Second sheath 80;Second pusher 90;Pushing part 91;Length direction H of flow channel. Specific implementation

[0067] The embodiments of the utility model are described in detail below, the examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the utility model, and cannot be understood as a limitation of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0068] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model.

[0069] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of technical features. Thus, features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0070] Embodiment 1

[0071] The present embodiment provides a fixed blood sampling device, as shown in Figure 1 , Figure 2 and Figure 3 , the fixed blood sampling device comprises a blood sampling needle, a tail needle and a connecting piece 30 connecting the two, wherein the blood sampling needle comprises a blood sampling needle fixed end 110 and a blood sampling needle blood sampling end 120, the tail needle comprises a tail needle fixed end 210 and a tail needle collection end 220, the connecting piece 30 is made of transparent material, a flow channel 34 is arranged in the connecting piece 30, the blood sampling needle fixed end 110 and the tail needle fixed end 210 are both sealed and fixed in the flow channel 34 of the connecting piece 30, the blood sampling needle blood sampling end 120 and the tail needle collection end 220 respectively extend from both ends of the flow channel 34, the blood sampling needle blood sampling end 120 is mainly used for piercing the patient's body vein, and the tail needle collection end 220 is mainly used for connecting a vacuum blood collection tube.

[0072] In addition, a protective sleeve 22 is sleeved on the periphery of the tail needle collection end 220, one end of the protective sleeve 22 is fixed on the connecting piece 30, and the medical staff first pierces the patient's body vein with the blood sampling needle blood sampling end 120 during the operation, and then inserts the tail needle collection end 220 into the vacuum blood collection tube after piercing the protective sleeve 22, so that the blood will successively pass through the blood sampling needle, the flow channel 34 in the connecting piece 30 and the tail needle, and enter the inside of the vacuum blood collection tube, thereby completing the collection of blood. A needle holder 21 is further arranged on the 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, one end of the needle holder 21 is also connected to the connecting piece 30, and the operator can directly hold the needle holder 21 during blood sampling, so that blood sampling is more convenient. The structure and connection mode of the needle holder 21 are prior art, and will not be described here.

[0073] It should be noted that the connecting piece 30 is internally provided with a flow channel 34, and the length direction H of the flow channel is the flow direction of the blood. Figures 1 to 5As shown, the fixed blood sampling device further comprises a filter core 40 arranged on the connecting piece 30. The filter core 40 adjusts the communication relationship between the internal gas of the connecting piece 30 and the external air, i.e. adjusts the communication relationship between the flow channel 34 of the connecting piece 30 and the external air. When the filter core 40 does not contact the liquid, the communication relationship between the internal gas of the connecting piece 30 and the external air is opened. When the filter core 40 contacts the liquid, the communication relationship between the internal gas of the connecting piece 30 and the external air is closed.

[0074] Specifically, when the patient is sampled, the blood passes through the blood sampling needle, the flow channel 34 of the connecting piece 30 and the tail needle in turn, and finally enters the inside of the vacuum blood collection tube. Therefore, the fixed end 110 of the blood sampling needle and the flow channel 34 of the connecting piece 30, and the flow channel 34 of the connecting piece 30 and the fixed end 210 of the tail needle are in communication with each other. The periphery of the collection end 220 of the tail needle is sleeved with a protective sleeve 22. Therefore, the collection end 220 of the tail needle is in a sealed state due to the protective sleeve 22 when it is not connected to the vacuum blood collection tube. At this time, if the blood sampling end 120 of the blood sampling needle directly punctures the vein of the patient, the blood may not flow out due to the air pressure. In this case, the filter core 40 is arranged on the connecting piece 30. The overall structure of the filter core 40 is a cylindrical structure. When the filter core 40 does not contact the liquid such as blood, it has a certain air permeability. When the filter core 40 contacts the liquid such as blood, its internal structure will automatically change, so that it loses the air permeability. The structure and material of the filter core 40 belong to the prior art, and will not be described here.

[0075] After the filter core 40 is arranged on the connecting piece 30, the internal gas of the connecting piece 30 and the external air can be communicated as needed, and the change of air pressure is used to promote the blood to be drawn out more smoothly. When the medical staff punctures the vein of the patient with the blood sampling end 120 of the blood sampling needle, the filter core 40 has not contacted the blood, and the air pressure in the connecting piece 30 is the same as the atmospheric pressure, so that the blood of the patient can flow out more easily. When the filter core 40 contacts the blood, the internal gas of the connecting piece 30 is isolated from the external air by the filter core 40. The blood flows through the connecting piece 30. Since the material of the connecting piece 30 is arranged as a transparent material, the medical staff can observe the blood flow in the connecting piece 30 through the transparent connecting piece 30, so as to timely insert the collection end 220 of the tail needle into the vacuum blood collection tube after puncturing the protective sleeve 22, thereby completing the collection of the blood.

[0076] In combination Figure 7 and Figure 8As shown, a through hole 32 is formed on the side wall of the connecting piece 30, which is communicated with the flow channel 34 inside the connecting piece 30, and the filter core 40 is fitted in the through hole 32. Compared with other positions of the connecting piece 30 or other connecting modes of the filter core 40, this mode can more conveniently utilize the through hole 32 to communicate the internal gas of the connecting piece 30 with the external air, and utilize the filter core 40 to adjust the communication relationship. Specifically, the filter core 40 is in interference fit with the through hole 32, so that the medical staff can more stably connect the filter core 40 on the side wall of the connecting piece 30 during blood drawing. In addition, the through hole 32 is further provided with a step portion 33 near one end of the communication channel of the connecting piece 30, and the filter core 40 in interference fit in the through hole 32 can abut against the step portion 33. When the filter core 40 is installed on the connecting piece 30, only a certain external force needs to be applied to the filter core 40, and the filter core 40 can abut against the step portion 33 to realize the installation of the filter core 40 on the connecting piece 30, which is more convenient and fast in operation.

[0077] As shown in Figure 2 and Figure 8 In the length direction H of the flow channel inside the connecting piece 30, the position of the filter core 40 on the connecting piece 30 is between the fixed end 110 of the blood taking needle and the fixed end 210 of the tail needle. That is, when the patient is blood drawn, the blood enters from the blood taking needle fixed end 110 after entering the blood taking needle blood taking end 120, and then directly reaches the position of the connecting piece 30, so that the connecting piece 30 contacts the blood and seals the communication relationship between the flow channel 34 of the connecting piece 30 and the outside. After the communication relationship between the flow channel 34 of the connecting piece 30 and the outside is sealed, the blood enters the tail needle fixed end 210 and finally flows out from the tail needle collecting end 220 and is collected into the vacuum blood collection tube. Through this arrangement, when the filter core 40 is arranged in the through hole 32 of the side wall of the connecting piece 30, the through hole 32 where the filter core 40 is placed can be directly communicated with the flow channel 34, which is more convenient for the internal gas of the connecting piece 30 to communicate with the external air, so that the blood can be more smoothly drawn out.

[0078] As shown in Figure 2 and Figure 5As shown, the fixed blood sampling device further comprises a needle seat 50, the fixed end 110 of the blood sampling needle is connected to the connecting piece 30 through the needle seat 50, because the radial size of the blood sampling needle is too small, if the fixed end 110 of the blood sampling needle is directly connected and fixed on the connecting piece 30, it is not conducive to the fixation and sealing between the blood sampling needle and the connecting piece 30. The fixed blood sampling device is provided with the needle seat 50, the first end of the needle seat 50 is sealingly inserted into the connecting piece 30 along the length direction H of the flow channel, and the needle seat 50 is provided with a through hole in the inside thereof along the length direction H of the flow channel, the fixed end 110 of the blood sampling needle is sealingly inserted into the second end of the needle seat 50, and the blood sampling needle is in communication with the through hole in the inside of the needle seat 50. Through this kind of setting, the radial size of the blood sampling needle is too small, which leads to insufficient connection strength or cannot be sealingly connected between the fixed end 110 of the blood sampling needle and the connecting piece 30.

[0079] As shown in Figure 4 , Figure 5 , Figure 7 and Figure 8 , the connecting piece 30 is provided with an annular wall 31 extending outwardly along the radial direction of the connecting piece 30 at the end for inserting the needle seat 50, and an annular accommodating cavity is formed between the annular wall 31 and the connecting piece 30. In the embodiment, the annular wall 31 is directly integrally provided with the connecting piece 30, but in other embodiments, the annular wall 31 and the connecting piece 30 can be completely provided separately. As shown in Figure 1 , Figure 2 and Figure 3 , the fixed blood sampling device further comprises a first sheath 11, the first sheath 11 is a tubular wall structure with one end open, the first sheath 11 is sleeved on the periphery of the blood sampling needle, and the open end of the first sheath 11 is connected to the periphery of the annular wall 31 in an interference fit. Through this kind of setting, the first sheath 11 wraps the blood sampling needle, protects the blood sampling needle when blood sampling is not performed, and avoids pollution; when blood sampling is needed, the first sheath 11 is detached relative to the blood sampling needle, and due to the existence of the annular wall 31, the distance between the first sheath 11 and the blood sampling needle is enlarged, avoiding mutual contact during the detaching process. As shown in Figure 7 , the annular wall 31 and the through hole 32 provided with the filter element 40 are arranged at intervals on the connecting piece 30 in the length direction H of the flow channel, avoiding the contact and interference between the first sheath 11 and the filter element 40.

[0080] As shown in Figures 1 to 4 , the fixed blood sampling device further comprises a first pushing member 60, in combination with Figure 6As shown, the first pusher 60 has a ring-shaped fixing portion 51, and the first pusher 60 is connected to the periphery of the needle seat 50 by the ring-shaped fixing portion 51. The first pusher 60 also has an extension portion connected to the ring-shaped fixing portion 51 and extending from the connection between the first sheath 11 and the annular wall 31 to the outside of the first sheath 11 along the length direction H of the flow channel. The first pusher 60 as a whole can move relative to the needle seat 50 under the action of an external force, and during the movement, the first pusher 60 abuts against the first sheath 11 by the extension portion, so that the first sheath 11 is forced to separate from the annular wall 31. Through this arrangement, when the medical staff performs blood sampling, by slightly applying an external force to the first pusher 60, the first pusher 60 can be moved relative to the needle seat 50, and during the movement, the first sheath 11 is separated from the annular wall 31, so that the medical staff can more conveniently operate the first pusher 60, thereby more conveniently disassembling 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 the pressing portion 61 has a pressing surface adapted to the shape of the thumb of the operator, so that the thumb of the operator can be attached to the pressing surface, thereby applying a force to the pressing portion 61, so that the pushing of the first pusher 60 as a whole is more labor-saving, and the medical staff can more conveniently disassemble the first sheath 11.

[0081] As shown in Figure 2 , Figure 9 , Figure 10 and Figure 11 , the fixed blood sampling device further comprises three sliders, namely an outer slider 71, a middle slider 72 and an inner slider 73. Each of the sliders is a tubular structure with both ends open and is nested with each other. The inner slider 73 is nested around the periphery of the needle seat 50, and the first pusher 60 is fixedly connected to the outer slider 71. The inner slider 73 and the adjacent sliders can slide relative to the needle seat 50 along the length direction H of the flow channel. Through this arrangement, the first pusher 60 can more conveniently move relative to the needle seat 50 along the length direction H of the flow channel, thereby driving the first sheath 11 to separate from the annular wall 31. It should be noted that in the present embodiment, the number of sliders is three, and the three sliders are nested with each other, but in other embodiments, the number of sliders can be other numbers. Preferably, the number of sliders corresponds to the length of the blood sampling needle. When the length of each slider and the blood sampling needle is fixed, by adjusting the number of sliders, the medical staff can push the nested sliders to make the sliders slide relative to each other after blood sampling, so that the blood sampling needle can be completely wrapped, thereby avoiding that the used blood sampling needle injures the medical staff or other personnel.

[0082] As shown in Figure 2 , Figure 4 andFigure 8 As shown, the connecting piece 30 is provided with an annular wall 31 extending outwardly in the radial direction of the connecting piece 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 connecting piece 30. The three sliders are nested with each other in a state of not sliding with respect to each other, i.e., the three sliders in the nested state are accommodated inside the annular accommodating cavity at the end close to the connecting piece 30, and the ends of the three sliders away from the connecting piece 30 do not exceed the second end of the needle holder 50. In this way, when the medical staff needs to disassemble the first sheath 11, only a small force needs to be applied to the first pusher 60 to make the outer slider 71 slide, at which time the end of the other sliders close to the connecting piece 30 can still be accommodated inside the annular accommodating cavity, and the end of the outer slider 71 away from the connecting piece 30 also does not excessively exceed the second end of the needle holder 50, avoiding interference with the position of the slider when the blood collection needle pierces the patient's vein. In addition, by providing the annular wall 31 on the periphery of the connecting piece 30 and using the annular accommodating cavity formed between the annular wall 31 and the connecting piece 30 to accommodate the sliders, the medical staff can make the blood collection end of the blood collection needle pierce the patient's vein by contacting the annular wall 31 during the blood collection process, thereby avoiding the misapplication of external force to the sliders, and further avoiding the sliding of the sliders relative to the needle holder 50 during the blood collection process, affecting the normal blood collection process.

[0083] As shown in Figure 5 , Figure 9 , Figure 10 and Figure 11 , the needle holder 50, the inner slider 73 and the middle slider 72 are provided with limiting clamping grooves 75 at the end away from the connecting piece 30, and the inner slider 73, the middle slider 72 and the outer slider 71 are provided with buckles 74 at the end close to the connecting piece 30, the buckles 74 can be combined with the corresponding limiting clamping grooves 75 to limit the sliding of the inner slider 73 away from the needle holder 50 and the mutual sliding of the plurality of sliders. When the buckles 74 on the three sliders are combined with the corresponding limiting clamping grooves 75, the length of the three sliders in the length direction H of the flow channel is the longest, at which time the total length of the three sliders in this direction is greater than the axial dimension of the blood collection needle, so that the plurality of sliders completely wrap the blood collection needle, avoiding the blood collection needle from accidentally injuring the medical staff after blood collection.

[0084] Embodiment 2

[0085] This embodiment also provides a fixed blood collection device, which has a similar structure to the fixed blood collection device in Embodiment 1, as shown in Figure 12 and Figure 13As shown, the filter core 40 of the fixed blood sampling device in this embodiment is also arranged in the through hole on the side wall of the connecting piece 30, which is also communicated with the flow channel, but the communication mode of the filter core 40 with the flow channel in the through hole is different from that in Embodiment 1. The following is only described in detail for the differences from Embodiment 1.

[0086] As Figure 13 As described above, the protective sleeve 22 is sleeved on the periphery of the tail needle collecting end 220, and the protective sleeve 22 is connected to the connecting piece 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 connecting piece 30 and is divided into a sealing section 211 and a communication section 212 in the length direction of the flow channel, the sealing section 211 is arranged relatively close to the blood sampling needle fixed end 110, and the communication section 212 is arranged relatively far away from the blood sampling needle fixed end 110. The tail needle fixed end 210 is fixed in the flow channel through the sealing section 211, for example, a sealing glue can be arranged on the periphery of the sealing section 211 to seal and fix it with the flow channel, and the outer wall of the communication section 212 has a gap between the flow channel and the connecting piece 30, and the filter core 40 is arranged on the connecting piece 30 corresponding to the communication section 212.

[0087] When the patient is sampled, the blood enters from the blood sampling needle sampling end 120, passes through the blood sampling needle, and flows out from the blood sampling needle fixed end 110 to the flow channel of the connecting piece 30. In this process, the gas inside the flow channel can be discharged from the tail needle fixed end 210 to the tail needle collecting end 220. Since the protective sleeve 22 is arranged on the periphery of the tail needle at this time, the gas discharged from the tail needle collecting end 220 will flow to the communication section 212 of the tail needle fixed end 210 from the gap between the tail needle and the protective sleeve 22, and finally be discharged from the filter core 40 at the communication section 212. Through this kind of arrangement, when the patient is first sampled, the flow channel can still be communicated with the outside through the filter core 40, and the change of air pressure is used to promote the blood to be extracted more smoothly; when the medical staff observes the blood at the connecting piece 30, the tail needle can be inserted into the vacuum blood collection tube after piercing the protective sleeve 22 according to the need, at this time, the blood can directly enter into the inside of the vacuum blood collection tube through the tail needle collecting end 220, so as to smoothly complete the sampling.

[0088] As Figure 13As shown, the fixed blood sampling device is also provided with a needle seat 50 outside the fixed end 110 of the blood sampling needle, the first end of the needle seat 50 is sealingly inserted into the connecting piece 30 along the length direction of the flow channel, and the needle seat 50 is provided with a through hole inside along the length direction of the flow channel, the fixed end 110 of the blood sampling needle is sealingly inserted into the second end of the needle seat 50, and the blood sampling needle is in communication with the through hole inside the needle seat 50. In addition, a fixed part 51 is also provided at the end of the second end of the blood sampling needle. The fixed blood sampling device is provided with a second sheath 80, which is sleeved outside the blood sampling needle, and the second sheath 80 has an open end sleeved on the fixed part 51, and when the sliding piece outside the needle seat 50 slides relative to the needle seat 50, the second sheath 80 can be separated from the fixed part 51. By providing the second sheath 80 outside the blood sampling needle, the blood sampling needle can be protected when not sampling blood to avoid contamination; when blood sampling is needed, the second sheath 80 is separated from the fixed part 51 by sliding the sliding piece relative to the needle seat 50, which is more convenient to operate.

[0089] As shown in Figure 13 and Figure 14 In this embodiment, two sliding pieces are provided outside the needle seat 50, the inner sliding piece 73 is sleeved on the needle seat 50, and the outer wall of the outer sliding piece 71 is provided with a second pushing piece 90, which extends outwardly along the radial direction of the sliding piece, and the end of the extension is provided with a pushing part 91. Through this kind of setting, when the medical staff is sampling blood, by applying external force to the pushing part 91 of the second pushing piece 90, the second pushing part 91 drives the sliding piece to move, so that the second sheath 80 is more conveniently separated from the fixed part 51.

[0090] Embodiment 3

[0091] This embodiment also provides a fixed blood sampling device, which has similar main structure and fixed blood sampling device in embodiment 2. However, the setting position of the filter element 40 and the communication mode of the internal flow channel of the connecting piece 30 with the outside in this embodiment are different from those in embodiment 2. As shown in Figure 15 In this embodiment, the filter element 40 is arranged on the tail needle collecting end 220 and abuts against the connecting piece 30, and a protective sleeve 22 is arranged outside the tail needle collecting end 220, one end of the protective sleeve 22 is sleeved and fixed on part of the outer periphery of the filter element 40, so that part of the filter element 40 is inside the protective sleeve 22 and part of the filter element 40 is outside the protective sleeve 22, the gas inside the flow channel enters the inside of the tail needle through the fixed end 210 of the tail needle, is discharged through the tail needle collecting end 220, reaches the inside of the protective sleeve 22, and is then discharged through the filter element 40, thereby satisfying the communication between the gas inside the flow channel and the outside air, so that the blood is more smoothly drawn out.

[0092] Although the specific embodiments of the present application are described above, those skilled in the art should understand that this is only an example, the protection scope of the present application is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present application, but these changes and modifications all fall within the protection scope of the present application.

Claims

1. A stationary blood sampling device comprising a blood sampling needle, a tail needle and a connecting member, characterized in that: The material of the connecting piece is transparent, and the connecting piece is internally provided with a flow channel, and the fixed end of the blood taking needle and the fixed end of the tail needle are both sealingly fixed in the flow channel; The fixed blood taking device further comprises a filter element, which adjusts the communication relationship between the internal gas of the connecting piece and the external air; wherein, when the filter element does not contact liquid, the communication relationship between the internal gas of the connecting piece and the external air is opened, and when the filter element contacts liquid, the communication relationship between the internal gas of the connecting piece and the external air is closed. The fixed blood taking device further comprises: A needle seat, a first end of the needle seat is sealingly inserted into the connecting piece along the length direction of the flow channel, and a through hole is formed in the needle seat along the length direction of the flow channel, and the fixed end of the blood taking needle is sealingly inserted into a second end of the needle seat.

2. The stationary blood sampling device according to claim 1, characterized in that A through hole is formed in the side wall of the connecting piece, and the through hole is communicated with the flow channel, and the filter element is arranged in the through hole.

3. The stationary blood sampling device according to claim 2, wherein Along the length direction of the flow channel, the position of the filter element on the connecting piece is between the fixed end of the blood taking needle and the fixed end of the tail needle.

4. The stationary blood sampling device according to claim 2, wherein A protective sleeve is further sealingly arranged on the periphery of the collection end of the tail needle; The fixed end of the tail needle comprises a sealing section and a communication section along the length direction of the flow channel, the sealing section is arranged close to the fixed end of the blood taking needle, the fixed end of the tail needle is sealingly fixed in the flow channel through the sealing section, and the outer wall of the communication section has a gap between the connecting piece in the flow channel, and the filter element is arranged on the connecting piece corresponding to the communication section.

5. The stationary blood sampling 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 in interference fit.

6. The stationary lancing device of claim 1, wherein, The filter element is arranged on the collection end of the tail needle, and a protective sleeve is further arranged on the periphery of the collection end of the tail needle, and the protective sleeve has an open end fixed on part of the periphery of the filter element.

7. The stationary blood sampling device according to claim 2, wherein The filter element is arranged on the collection end of the tail needle, and a protective sleeve is further arranged on the periphery of the collection end of the tail needle, and the protective sleeve has an open end fixed on part of the periphery of the filter element.

8. The stationary lancing device of claim 3, wherein the lancet is configured to be activated by a user. The filter element is arranged on the collection end of the tail needle, and a protective sleeve is further arranged on the periphery of the collection end of the tail needle, and the protective sleeve has an open end fixed on part of the periphery of the filter element.

9. The stationary lancing device of claim 4, wherein the lancet is configured to be activated by a user. The filter element is arranged on the collection end of the tail needle, and a protective sleeve is further arranged on the periphery of the collection end of the tail needle, and the protective sleeve has an open end fixed on part of the periphery of the filter element.

10. The stationary lancing device of claim 5, wherein the lancet is configured to be activated by a user. The filter element is arranged on the collection end of the tail needle, and a protective sleeve is further arranged on the periphery of the collection end of the tail needle, and the protective sleeve has an open end fixed on part of the periphery of the filter element.

11. The stationary lancing device of claim 1, wherein, The fixed blood sampling device further comprises a first sheath, and an end of the connecting member, into which the needle holder is inserted, extends outward in a radial direction of the connecting member to form an annular wall, and the first sheath is arranged around the blood sampling needle and is connected to the annular wall in an interference fit.

12. The stationary lancing device of claim 11, wherein the lancet is configured to be activated by a user. The fixed blood sampling device further comprises a first push member, which is connected to the needle holder and extends from a connection between the first sheath and the annular wall to the outside of the first sheath in a length direction of the flow channel. The first push member is movable relative to the needle holder under an external force and drives the first sheath to be separated from the annular wall during the movement.

13. The stationary lancing device of claim 12, wherein the lancet is configured to be activated by a user. An end of the first push member, which extends to the outside of the first sheath, is provided with a pressing portion, and the pressing portion has a pressing surface that bears the external force.

14. The stationary lancing device of claim 10, wherein the lancet is configured to be activated by a user. The fixed blood sampling device further comprises: At least one slide member, which is a hollow cylinder with open ends and is nested with each other; The innermost slide member is nested around the needle holder, and the innermost slide member is slidable relative to the needle holder and the adjacent slide members in the length direction of the flow channel.

15. The stationary lancing device of claim 14, wherein the lancet is configured to be activated by a user. An end of the connecting member, into which the needle holder is inserted, extends outward in a radial direction of the connecting member to form an annular wall, and an annular accommodating cavity is formed between the annular wall and the connecting member; In a state where the slide members and the needle holder are not slid relative to each other, an end of the slide member, which is close to the connecting member, is accommodated inside the annular accommodating cavity, and an end of the slide member, which is away from the connecting member, does not exceed the second end of the needle holder.

16. The stationary lancing device of claim 14, wherein the lancet is configured to be activated by a user. The fixed blood sampling device further comprises: A second sheath, the second end of the needle holder is provided with a fixing portion, the second sheath is arranged around the blood sampling needle, and an open end of the second sheath is arranged on the fixing portion, and the slide members can drive the second sheath to be separated from the fixing portion during the mutual sliding relative to the needle holder.

17. The stationary lancing device of claim 16, wherein the lancet is configured to be activated by a user. The outermost slide member is provided with a second push member on an outer wall thereof, the second push member extends outward in a radial direction of the slide member, and a pushing portion is arranged at an extended end of the second push member.

18. The stationary lancing device of claim 14, wherein the lancet is configured to be activated by a user. The needle holder and the slide members are provided with limiting clamping grooves at an end away from the connecting member, and the slide members are provided with buckles at an end close to the connecting member, the buckles can be combined with the corresponding limiting clamping grooves to limit the innermost slide member to be separated from the needle holder and the adjacent slide members to be separated from each other.

19. The stationary lancing device of claim 18, wherein the lancet is configured to be activated by a user. The longest dimension of at least one slide member in the length direction of the flow channel is greater than the axial dimension of the blood sampling needle.

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