Special injector for extracting marrow fluid

Abstract

The utility model relates to the technical field of bone marrow fluid extraction, and discloses a special injector for bone marrow fluid extraction, which is characterized in that an annular bulge is arranged at a proper position in a cylinder body, so that when a rubber plug moves to be propped against the annular bulge, the amount of extracted bone marrow fluid in the cylinder body behind the rubber plug reaches a preset value; the situation that the bone marrow fluid is diluted due to too much suction amount is avoided; meanwhile, through the cooperation of a first one-way conduction piece and a second one-way conduction piece, after the preset bone marrow fluid extraction amount is reached, the extracted bone marrow fluid can be discharged through a discharge pipe only by pushing the extraction part in the reverse direction, and the bone marrow fluid is used for smearing the bone marrow fluid; then, the extraction part is controlled to continue to move, subsequent bone marrow fluid extraction is carried out, in the whole process, the syringe body does not need to be detached, the operation time is shortened, and the probability of operation failure caused by unmatched struggling of children patients can be reduced; in the bone marrow fluid extraction process, the injector and the puncture needle do not need to be separated, and the subsequently extracted bone marrow fluid sample is prevented from being polluted.

Description

Technical Field

[0001] This utility model relates to the field of bone marrow fluid extraction technology, and in particular to a special syringe for bone marrow fluid extraction. Background Technology

[0002] Currently, when using bone marrow fluid for smear preparation, it is necessary to extract the initial 0.1ml-0.2ml of bone marrow fluid. If too much fluid is extracted, it is easy for blood to mix into the bone marrow fluid and dilute it, resulting in inaccurate test results. After the bone marrow fluid extraction is completed, the syringe needs to be separated from the bone marrow puncture needle. Then, the bone marrow fluid extracted from the syringe is dripped onto a glass slide for smear preparation. Afterward, the syringe is reconnected to the bone marrow puncture needle for subsequent bone marrow fluid extraction.

[0003] During the above process, medical staff may find it difficult to accurately control the initial amount of bone marrow fluid extracted, which could easily lead to excessive extraction, dilution of the bone marrow fluid, and inaccurate test results. The need to disassemble the syringe and puncture needle prolongs the operation time, especially for pediatric patients, as they may have difficulty cooperating with invasive procedures, potentially leading to failure of subsequent bone marrow fluid extractions. Furthermore, during the process of separating the syringe and puncture needle to complete the smear and then reconnecting the syringe and puncture needle, external contaminants can easily enter the syringe, contaminating subsequent bone marrow fluid extractions. Utility Model Content

[0004] The purpose of this invention is to provide a special syringe for bone marrow fluid extraction, which solves the problems of inaccurate control of the amount of bone marrow fluid extracted in the prior art, resulting in deviations in measurement results and inconvenience in bone marrow fluid extraction.

[0005] To achieve the above objectives, embodiments of this application provide a special syringe for bone marrow fluid extraction, comprising:

[0006] The syringe body includes a barrel and a suction part slidably fitted inside the barrel, the suction part having a rubber stopper that fits in contact with the inner wall of the barrel;

[0007] A connecting tube communicates with the end of the cylindrical body. A first unidirectional guide element is provided on the side of the connecting tube away from the cylindrical body, allowing the medium to flow unidirectionally from the outside into the connecting tube. A discharge tube is connected to the connecting tube between the first unidirectional guide element and the cylindrical body. A second unidirectional guide element is provided in the discharge tube, allowing the medium to flow unidirectionally from the inside into the outside of the connecting tube. The end of the connecting tube away from the cylindrical body is connected to a puncture needle. The cylindrical body has a first end near the connecting tube and a second end away from the connecting tube.

[0008] An annular protrusion is provided inside the cylinder to stop the rubber stopper, so that the rubber stopper can move between the first end and the annular protrusion.

[0009] In some embodiments of this application, the rubber stopper is an elastic element, and the rubber stopper abuts against the annular protrusion to produce elastic deformation, so that the rubber stopper moves between the annular protrusion and the second end.

[0010] In some embodiments of this application, a first pipe section and a second pipe section are provided through the connecting pipe along its length direction. The first pipe section is connected to the cylinder, and the second pipe section is connected to the puncture needle.

[0011] The first unidirectional guide includes a first ball that is axially slidably installed in the first pipe section, with the outer periphery of the first ball spaced apart from the inner wall of the first pipe section;

[0012] The first pipe section is provided with a first elastic element that can be compressed axially. One end of the first elastic element is connected to the first ball, and the other end is fixed in the first pipe section relative to the first ball, so that the first ball abuts against the connection between the second pipe section and the first pipe section to block the second pipe section.

[0013] In some embodiments of this application, the discharge pipe is connected to the first pipe segment, and a third pipe segment and a fourth pipe segment are connected and pass through the discharge pipe along its length; the third pipe segment is connected to the outside, and the fourth pipe segment is connected to the first pipe segment;

[0014] The second unidirectional guide includes a second ball that is axially slidably installed inside the third pipe section, with the outer periphery of the second ball spaced apart from the inner wall of the third pipe section;

[0015] The third pipe section is provided with a second elastic element that can be compressed axially. One end of the second elastic element is connected to the second ball, and the other end is fixed in the third pipe section relative to the second ball, so that the second ball abuts against the connection between the fourth pipe section and the third pipe section to block the fourth pipe section.

[0016] In some embodiments of this application, the annular protrusion is an elastic element.

[0017] In some embodiments of this application, the annular protrusion has a first chamfer on each of its axial sides away from the inner wall of the cylinder.

[0018] In some embodiments of this application, the rubber stopper has a second chamfer on each of its two axially oriented edges.

[0019] In some embodiments of this application, the suction part further includes a core rod connected to the rubber stopper, and the core rod is provided with a push handle at one end outside the cylinder.

[0020] In some embodiments of this application, the outer periphery of the connecting pipe has a tapered portion, and the outer diameter of the tapered portion gradually decreases in the direction away from the cylinder.

[0021] In some embodiments of this application, the tapered portion is an elastic rubber component.

[0022] Compared with the prior art, the beneficial effects of this utility model's special syringe for bone marrow fluid extraction are as follows: This solution uses an annular protrusion near the first end of the syringe barrel. When the rubber stopper moves to abut against the annular protrusion, it is stopped by the protrusion, thus ensuring that the amount of bone marrow fluid extracted from the syringe barrel behind the rubber stopper reaches a preset value, facilitating accurate control of the extracted amount by medical personnel. Simultaneously, a first one-way guide is provided in the connecting tube, and a second one-way guide is provided on the discharge tube. Through the cooperation of these two components, when the preset bone marrow fluid extraction amount is reached... After the bone marrow fluid is extracted, simply push the extraction section in the opposite direction to discharge the extracted bone marrow fluid through the drainage tube for use in bone marrow fluid smears. This effectively avoids dilution caused by excessive bone marrow fluid extraction, helping to improve the quality of the specimen. The entire process does not require disassembling the syringe body, reducing operation time, especially for pediatric patients, which can reduce the probability of operation failure due to their lack of cooperation and struggle. At the same time, during the bone marrow fluid extraction process, there is no need to separate the syringe from the puncture needle, which also avoids contamination of the subsequently extracted bone marrow fluid specimen. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 This is a cross-sectional view of the cylindrical body of this utility model.

[0025] Figure 3 For this utility model Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0026] Figure 4 This is a cross-sectional view of the connecting pipe and the discharge pipe of this utility model;

[0027] Figure 5 For this utility model Figure 4 Enlarged schematic diagram of the structure at point B;

[0028] Figure 6 For this utility model Figure 4 Enlarged schematic diagram of the structure at point C.

[0029] In the diagram, 1 is the syringe body; 11 is the barrel; 12 is the suction section; 121 is the rubber stopper; 1211 is the second chamfered section; 122 is the plunger; and 123 is the plunger handle.

[0030] 2. Connecting pipe; 21. Second pipe section; 22. First pipe section; 23. Tapered section;

[0031] 3. Discharge pipe; 31. Fourth pipe section; 32. Third pipe section;

[0032] 4. Annular protrusion; 41. First chamfered portion; 5. Grip portion; 6. First unidirectional guide member; 61. First sphere; 62. First elastic member; 7. Second unidirectional guide member; 71. Second sphere; 72. Second elastic member. Detailed Implementation

[0033] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0034] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. It should also be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0035] like Figures 1-6As shown in the embodiment of this application, a special syringe for bone marrow fluid extraction is proposed, comprising: a syringe body 1, the syringe body 1 including a barrel 11 and a suction part 12 slidably assembled within the barrel 11, the suction part 12 having a rubber stopper 121 that fits against the inner wall of the barrel 11; a connecting tube 2, communicating with the end of the barrel 11, the connecting tube 2 having a first unidirectional guide 6 for unidirectional flow of medium (bone marrow fluid) from the outside to the inside of the connecting tube 2, the connecting tube 2 located between the first unidirectional guide 6 and the barrel 11 having a discharge tube 3 vertically connected to it, the discharge tube 3 having a second unidirectional guide 7 for unidirectional flow of medium (bone marrow fluid) from the inside to the outside of the connecting tube 2; the end of the connecting tube 2 away from the barrel 11 being connected to a puncture needle; and an annular protrusion. 4. An annular protrusion 4 is provided on the inner wall of the cylinder 11 to stop the rubber stopper 121, so that when the rubber stopper 121 abuts against the annular protrusion 4, the space of the cylinder 11 on the side of the rubber stopper 121 away from the annular protrusion 4 reaches a preset volume. In this scheme, the arrangement position of the annular protrusion 4 is set according to the inner diameter of the cylinder 11 used. If the inner diameter of the cylinder 11 is slightly larger, the annular protrusion 4 is set closer to the first end. If the inner diameter of the cylinder 11 is slightly smaller, the annular protrusion 4 is set further away from the first end. In short, when the rubber stopper 121 moves in the cylinder 11 to abut against the annular protrusion 4, the amount of bone marrow fluid extracted in the space of the cylinder 11 on the side of the rubber stopper 121 away from the annular protrusion 4 reaches a preset standard amount.

[0036] In this embodiment, during operation, medical personnel connect the connecting tube 2 to the puncture needle (the puncture needle has a channel, and the connecting tube 2 communicates with the channel). Then, the extraction unit moves the rubber stopper 121 within the cylinder 11 away from the puncture needle. As the rubber stopper 121 moves, bone marrow fluid is aspirated into the cylinder 11 until it comes into contact with the annular protrusion 4. At this point, the medical personnel feel a noticeable resistance, indicating that the amount of bone marrow fluid extracted has reached the preset standard (i.e., the initial 0.1ml-0.2ml). Subsequently, the medical personnel move the extraction unit in one direction and, through the rubber stopper 121, discharge the bone marrow fluid aspirated into the cylinder 11 through the discharge tube 3, thus recovering the initial 0.1ml. A smear is prepared using 0.2 ml of bone marrow fluid. During the extraction of bone marrow fluid, the first one-way guide 6 is in the conducting state, allowing the bone marrow fluid medium to enter the cylinder 11 (at this time, the second one-way guide 7 is in the non-conducting state). When the initially extracted bone marrow fluid is discharged, the second one-way guide 7 is in the conducting state (so that the bone marrow fluid is discharged through the discharge tube 3), at which time the first one-way guide 6 is in the non-conducting state.

[0037] In this design, the annular protrusion 4 allows medical personnel to accurately control the initial amount of bone marrow fluid extracted, preventing blood from mixing with the bone marrow fluid due to excessive extraction, thus diluting the bone marrow fluid and improving the specimen qualification rate. Furthermore, when draining the extracted bone marrow fluid, there is no need to separate the syringe body 1 from the puncture needle; simply control the aspiration section 12 in the opposite direction and drain the bone marrow fluid from the cylinder 11 through the discharge tube 3 via the rubber stopper 121. This shortens the operation time and avoids contamination caused by disassembling the syringe body 1 and puncture needle. This significantly improves the success rate, especially when performing procedures on pediatric patients.

[0038] In some embodiments of this application, the rubber stopper 121 is configured as an elastic element so that when the rubber stopper 121 abuts against the annular protrusion 4, the rubber stopper 121 undergoes elastic deformation, thereby moving the rubber stopper 121 between the annular protrusion 4 and the second end, so that the rubber stopper 121 passes over the annular protrusion 4; after the initial 0.1-0.2 ml of bone marrow fluid is completely drained, the aspiration section 12 is operated to continue aspirating bone marrow fluid. When the rubber stopper 121 moves to abut against the annular protrusion 4, the medical personnel apply a little force to cause the contact area between the rubber stopper 121 and the annular protrusion 4 to undergo compression deformation and pass over the annular protrusion 4, so that the bone marrow fluid can continue to be extracted for use as a specimen in subsequent experiments.

[0039] In some embodiments of this application, such as Figure 4 As shown, a first pipe section 22 and a second pipe section 21 are connected and run through the connecting pipe 2 along its length. The first pipe section 22 is connected to the cylinder 11, and the second pipe section 21 is connected to the puncture needle. Figure 5 As shown, the first unidirectional guide member 6 includes a first ball 61 axially slidably mounted within a first pipe section 22 (a sliding rod is radially connected to both sides of the first ball 61, and a groove is provided within the first pipe section 22 to cooperate with the sliding rod, allowing the first ball 61 to be axially slidably mounted within the first pipe section 22). The outer diameter of the first ball 61 is between the inner diameter of the first pipe section 22 and the inner diameter of the second pipe section 21. A first elastic member 62 (a spring) capable of axial compression is provided within the first pipe section 22. One end of the first elastic member 62 is connected to the sliding rod, and the other end is fixedly connected to the groove. When the first elastic member 62 is in its natural state, the first ball 61 abuts against the second pipe section 21 (e.g., ...). Figure 5 (as shown), so that the first pipe section 22 and the second pipe section 21 are no longer connected.

[0040] In this embodiment, when medical personnel move the suction unit 12, the rubber stopper 121 moves away from the connecting tube 2 inside the cylinder 11, thereby creating a negative pressure inside the cylinder 11. This forces the first ball 61 to move in the direction of squeezing the first elastic member 62 (making the first tube segment 22 and the second tube segment 21 connected). Ultimately, the bone marrow fluid enters the cylinder 11 through the channel between the first ball 61 and the first tube segment 22 from the puncture needle. When it is necessary to drain the bone marrow fluid, the suction unit 12 is moved in the opposite direction and the bone marrow fluid aspirated into the cylinder 11 is pushed out of the cylinder 11 through the rubber stopper 121. During this process, the first ball 61 is subjected to a force from the bone marrow fluid and the elastic force of the first elastic member 62, causing it to abut against the second tube segment 21 again (the first tube segment 22 and the second tube segment 21 are no longer connected), so that the bone marrow fluid can only be discharged through the discharge tube 3.

[0041] In some embodiments of this application, such as Figure 4 As shown, the discharge pipe 3 is connected to the first pipe section 22, as follows: Figure 6 As shown, a third pipe section 32 and a fourth pipe section 31 are connected and run through the length of the discharge pipe 3. The fourth pipe section 31 is connected to the first pipe section 22, and the third pipe section 32 is connected to the outside. The second unidirectional guide member 7 includes a second ball 71 that is axially slidably installed in the third pipe section 32 (the second ball 71 has a sliding rod connected to its radial sides on both sides along its axis, and a sliding groove that cooperates with the sliding rod is provided in the third pipe section 32, so that the second ball 71 can be axially slidably assembled in the third pipe section 32). The outer diameter of the second ball 71 is between the third pipe section 32 and the fourth pipe section 31. The third pipe section 32 is provided with a second elastic member 72 (which is a spring) that can be compressed axially. One end of the second elastic member 72 is connected to the sliding rod, and the other end is fixedly connected to the sliding groove. When the second elastic member 72 is in its natural state, the second ball 71 abuts against the fourth pipe section 31, so that the third pipe section 32 and the fourth pipe section 31 are no longer connected.

[0042] When it is necessary to drain the bone marrow fluid aspirated into the cylinder 11, the medical staff moves the suction unit 12 in the opposite direction and pushes the bone marrow fluid aspirated into the cylinder 11 outward through the rubber stopper 121. The second ball 71 is subjected to a squeezing force from the bone marrow fluid, which forces the second ball 71 to move in the direction of squeezing the second elastic element 72 (at this time, the first tube segment 22 and the second tube segment 21 are not conductive), thereby allowing the bone marrow fluid to be discharged outward from the first tube segment 22 through the channel between the second ball 71 and the third tube segment 32. When it is necessary to continue aspirating bone marrow fluid, the suction unit 12 is moved in the opposite direction, so that the cylinder 11 is in a negative pressure environment. Then, under the elastic force of the second elastic element 72 and the negative pressure, the second ball 71 again comes into contact with the fourth tube segment 31, so that the third tube segment 32 and the fourth tube segment 31 are not conductive.

[0043] In some embodiments of this application, in order to make the rubber stopper 121 more easily pass over the annular protrusion 4, the annular protrusion 4 can be set as an elastic structural member (such as rubber). When the rubber stopper 121 abuts against the annular protrusion 4 (at which time the medical staff feel a relatively obvious resistance), the medical staff only need to apply a little force to make both the rubber stopper 121 and the annular protrusion 4 undergo compression deformation, thereby allowing the rubber stopper 121 to pass over the annular protrusion 4, so as to facilitate the subsequent extraction of a larger amount of bone marrow fluid for other experimental operations.

[0044] In some embodiments of this application, such as Figure 3 As shown, a first chamfered portion 41 is provided on both axial sides of the annular protrusion 4 away from the inner wall of the cylinder 11. The first chamfered portion 41 is provided so that when the rubber plug 121 abuts against the annular protrusion 4, it can easily pass over the annular protrusion 4.

[0045] In some embodiments of this application, a second chamfered portion 1211 is provided on the edges of the rubber stopper 121 on both sides along the axial direction. Through the cooperation between the second chamfered portion 1211 and the first chamfered portion 41 provided on the annular protrusion 4, the rubber stopper 121 can more easily pass over the annular protrusion 4.

[0046] In some embodiments of this application, such as Figure 2 As shown, the suction unit 12 also includes a core rod 122 connected to the rubber stopper 121. One end of the core rod 122, located outside the cylinder 11, is provided with a push handle 123. Figure 1 As shown, a gripping part 5 is provided at the end of the cylinder 11 away from the connecting tube 2. The gripping part 5 and the push handle 123 cooperate to allow medical personnel to hold the syringe body 1 and complete the aspiration of bone marrow fluid.

[0047] In some embodiments of this application, such as Figure 4 As shown, the outer periphery of the connecting tube 2 has a tapered portion 23. The outer diameter of the tapered portion 23 gradually decreases in the direction away from the cylinder 11. The tapered portion 23 makes it easier for the connecting tube 2 to be inserted into the channel of the puncture needle and to achieve connection with the puncture needle.

[0048] In some embodiments of this application, the tapered portion 23 is an elastic rubber component. When the connecting tube 2 is inserted into the channel of the puncture needle, the tapered portion 23 is squeezed by the channel wall of the puncture needle, thereby enabling the syringe body 1 to reliably connect with the puncture needle and preventing loosening between the two.

[0049] The working process of this utility model is as follows: Medical personnel insert the connecting tube 2 into the channel of the puncture needle to connect the syringe body 1 with the puncture needle. Then, they operate the aspiration part 12 and drive the rubber stopper 121 to move within the cylinder 11 to extract bone marrow fluid. When the rubber stopper 121 moves to the point of contact with the annular protrusion 4, the medical personnel feel a significant resistance. At this point, the amount of bone marrow fluid extracted reaches the preset value. Then, the aspiration part 12 is moved in the opposite direction and the aspirated bone marrow fluid is discharged outward through the discharge tube 3 via the rubber stopper 121 for bone marrow fluid smearing. Subsequently, the aspiration part 12 drives the rubber stopper 121 to continue moving away from the connecting tube 2 and to extract more bone marrow fluid. When the rubber stopper 121 moves to the point of contact with the annular protrusion 4 again, the medical personnel only need to apply a little force to make the rubber stopper 121 pass over the annular protrusion 4 and continue to extract bone marrow fluid for other experimental operations.

[0050] In summary, this utility model embodiment provides a special syringe for bone marrow fluid extraction. This solution uses an annular protrusion 4 at an appropriate position inside the barrel 11 to allow the rubber stopper 121 to move until it abuts against the annular protrusion 4, thereby ensuring that the amount of bone marrow fluid extracted from the barrel 11 behind the rubber stopper 121 reaches a preset value, facilitating accurate control of the extracted amount by medical personnel. Simultaneously, a first one-way guide 6 is provided in the connecting tube 2, and a second one-way guide 7 is provided on the discharge tube 3. Through the cooperation of these two components, once the preset amount of bone marrow fluid has been extracted, simply pushing the syringe in the opposite direction will extract the fluid. The extraction section allows the extracted bone marrow fluid to be discharged through the drainage tube 3 for use in bone marrow fluid smears. This effectively avoids dilution due to excessive aspiration of bone marrow fluid, thus improving the specimen quality rate. Subsequently, the extraction section continues to move and extract more bone marrow fluid. The entire process does not require disassembling the syringe body 1, reducing operation time. This is especially beneficial for pediatric patients, as it reduces the probability of operation failure due to their lack of cooperation and struggle. At the same time, the syringe does not need to be separated from the puncture needle during bone marrow fluid extraction, preventing contamination of subsequent extracted bone marrow fluid specimens.

[0051] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A special syringe for extracting bone marrow fluid, characterized in that, include: The syringe body (1) includes a barrel (11) and a suction part (12) slidably fitted inside the barrel (11). The suction part (12) has a rubber stopper (121) that is in contact with the inner wall of the barrel (11). A connecting tube (2) is connected to the end of the cylinder (11). A first unidirectional guide (6) is provided on the side of the connecting tube (2) away from the cylinder (11) to allow the medium to flow unidirectionally from the outside into the connecting tube (2). The connecting tube (2) located between the first unidirectional guide (6) and the cylinder (11) is connected to a discharge tube (3). A second unidirectional guide (7) is provided in the discharge tube (3) to allow the medium to flow unidirectionally from the inside to the outside of the connecting tube (2). The end of the connecting tube (2) away from the cylinder (11) is connected to a puncture needle. The cylinder (11) has a first end near the connecting tube (2) and a second end away from the connecting tube (2). An annular protrusion (4) is provided inside the cylinder (11) to block the rubber plug (121) so that the rubber plug (121) can move between the first end and the annular protrusion (4).

2. The special syringe for bone marrow fluid extraction according to claim 1, characterized in that, The rubber stopper (121) is an elastic element. The rubber stopper (121) abuts against the annular protrusion (4) to produce elastic deformation, so that the rubber stopper (121) moves between the annular protrusion (4) and the second end.

3. The special syringe for bone marrow fluid extraction according to claim 1, characterized in that, A first pipe section (22) and a second pipe section (21) are connected and pass through the connecting pipe (2) along its length direction. The first pipe section (22) is connected to the cylinder (11), and the second pipe section (21) is connected to the puncture needle. The first unidirectional guide (6) includes a first ball (61) axially slidably installed in the first pipe section (22), with the outer periphery of the first ball (61) spaced apart from the inner wall of the first pipe section (22); The first pipe section (22) is provided with a first elastic element (62) that can be compressed along the axis. One end of the first elastic element (62) is connected to the first ball (61), and the other end is fixed in the first pipe section (22) relative to the first ball (61), so that the first ball (61) abuts against the second pipe section (21) and the first pipe section (22) at the connection point, and blocks the second pipe section (21).

4. The special syringe for bone marrow fluid extraction according to claim 3, characterized in that, The discharge pipe (3) is connected to the first pipe section (22), and a third pipe section (32) and a fourth pipe section (31) are connected through the discharge pipe (3) along its length direction. The third pipe section (32) is connected to the outside, and the fourth pipe section (31) is connected to the first pipe section (22). The second unidirectional guide (7) includes a second ball (71) axially slidably installed in the third pipe section (32), with the outer periphery of the second ball (71) spaced apart from the inner wall of the third pipe section (32); The third pipe section (32) is provided with a second elastic element (72) that can be compressed along the axis. One end of the second elastic element (72) is connected to the second ball (71), and the other end is fixed in the third pipe section (32) relative to the second ball (71), so that the second ball (71) abuts against the connection between the fourth pipe section (31) and the third pipe section (32) to block the fourth pipe section (31).

5. The special syringe for bone marrow fluid extraction according to claim 1, characterized in that, The annular protrusion (4) is an elastic element.

6. The special syringe for bone marrow fluid extraction according to claim 5, characterized in that, The annular protrusion (4) has a first chamfer (41) on each of its two axial sides away from the inner wall of the cylinder (11).

7. The special syringe for bone marrow fluid extraction according to claim 1, characterized in that, The rubber stopper (121) has a second chamfer (1211) on each of its two axial edges.

8. The special syringe for bone marrow fluid extraction according to claim 1, characterized in that, The suction part (12) also includes a core rod (122) connected to the rubber stopper (121), and the core rod (122) is located outside the cylinder (11) with a push handle (123) at one end.

9. The special syringe for bone marrow fluid extraction according to any one of claims 1-8, characterized in that, The outer periphery of the connecting pipe (2) has a tapered portion (23), the outer diameter of which gradually decreases in the direction away from the cylinder (11).

10. The special syringe for bone marrow fluid extraction according to claim 9, characterized in that, The tapered part (23) is an elastic rubber component.

Images