A post-bone marrow aspiration device

Abstract

The application belongs to the technical field of bone marrow puncture, and relates to a bone marrow puncture post-aspiration device, which comprises a mounting shell, a transmission box fixedly arranged on the mounting shell and a limiting arc plate rotatably arranged on the mounting shell. The limiting block in the limiting unit is used for accurately limiting the liquid aspiration stroke, and the rack and pinion transmission quantized volume is used for ensuring the accurate aspiration amount and avoiding the excessive risk. Through the damping effect of the hydraulic damper, the moving speed of the liquid aspiration slider is limited, the aspiration speed is controllable, and the pain and tissue damage of the patient are reduced. With the bidirectional locking structure of the ratchet and the pawl, the reverse movement of the liquid aspiration slider is prevented, the bone marrow liquid backflow is prevented, and the infection and hematoma risk are reduced. The disposable syringe and the hydraulic damper are detachably designed through detachable clamping, disinfection is facilitated, and cross infection is reduced. The hydraulic transmission unlocking and the liquid outlet knob are one-key operated, the operation safety and convenience are improved, and the clinical precise and safe aspiration requirement is met.

Description

Technical Field

[0001] This invention belongs to the field of bone marrow aspiration technology, and particularly relates to a bone marrow aspiration device. Background Technology

[0002] In the medical field, bone marrow aspiration is an important diagnostic tool for obtaining bone marrow fluid for diseases such as leukemia and anemia. After bone marrow aspiration, the bone marrow fluid needs to be extracted into a syringe using an aspiration device. However, existing aspiration devices after bone marrow aspiration have the following significant drawbacks in practical applications:

[0003] (1) Uncontrollable extraction speed: The existing device lacks an effective speed control mechanism. If the medical staff's operation force is unstable when extracting bone marrow fluid, the extraction speed may be too fast, causing severe pain to the patient or damage to the bone marrow tissue, affecting the accuracy of subsequent tests.

[0004] (2) Inaccurate control of extraction volume: Different clinical tests require different amounts of bone marrow fluid (e.g., 5 ml, 10 ml, 15 ml, etc.). Traditional devices rely on medical staff to manually control the extraction process, lacking a quantitative limiting structure, which can easily lead to extraction volume errors, or even excessive extraction due to operational errors, increasing the risk to patients.

[0005] (3) Potential risk of fluid backflow: If the device is not stable enough or lacks anti-backflow design during the aspiration process, bone marrow fluid may flow back to the puncture site, which may not only affect the integrity of the sample, but also cause local infection or hematoma, and aggravate the patient's pain.

[0006] Therefore, a bone marrow aspiration device is needed to solve the above problems, which allows for controllable extraction speed, precise controllable extraction volume, and prevention of fluid backflow. Summary of the Invention

[0007] To address the above issues and overcome the shortcomings of existing technologies, this invention utilizes a limiting block in the limiting unit to precisely define the aspiration stroke, combined with rack and pinion transmission to quantify the volume, ensuring accurate aspiration and avoiding the risk of over-absorption. The damping effect of the hydraulic damper limits the movement speed of the aspiration slider, achieving controllable aspiration speed and reducing patient pain and tissue damage. A bidirectional locking structure of ratchet and pawl prevents the aspiration slider from moving in the opposite direction, preventing bone marrow fluid backflow and reducing the risk of infection and hematoma. The detachable disposable syringe and hydraulic damper design facilitate sterilization and reduce cross-infection. One-button operation of the hydraulic transmission unlocking and dispensing button enhances operational safety and convenience, meeting the clinical needs for precise and safe aspiration.

[0008] The technical solution adopted in this invention is as follows: A bone marrow aspiration device includes a mounting shell, a transmission box fixedly mounted on the mounting shell, and a limiting arc plate rotatably mounted on the mounting shell. A syringe body is detachably snapped into the mounting shell, and a piston rod is slidably mounted inside the syringe body. The snap-fit ​​design facilitates the use of disposable syringes for aspiration, avoiding the difficulties in disinfection caused by using fixed, reusable syringes, which could lead to wound infection in the patient. A piston box is fixedly mounted on the side wall of the mounting shell, and a snap-fit ​​piston is slidably mounted inside the mounting shell. One end of the piston rod is snap-fitted into the snap-fit ​​piston. A hydraulic damper is detachably fixed to one end of the piston box, and the detachable design facilitates the removal of the hydraulic damper. The device is sterilized. The hydraulic damper includes a piston box two fixedly mounted at one end of piston box one and a piston two slidably mounted inside piston box two. The piston box two has several small through holes. Piston box two is filled with hydraulic oil. The hydraulic oil prevents piston two from moving too quickly within piston box two when a return spring one is in place, thus preventing the extraction of bone marrow fluid from being too fast. A return spring one is fixedly mounted at one end of piston two. The other end of the return spring one is fixedly connected to piston box two. The function of the return spring one is to reset piston two. Piston one is fixedly mounted at the other end of piston two. Piston one is in contact with a locking piston. A fluid extraction slider is slidably mounted on the mounting shell. A transmission rod two is fixedly mounted between the fluid extraction slider and the locking piston.

[0009] As a preferred technical solution of this invention, the transmission box is provided with an array of limiting units. The limiting units can restrict the movement of the liquid-drawing slider. The limiting units include a limiting block slidably disposed on the top wall of the transmission box, a limiting button slidably disposed on the side wall of the transmission box, a slider sleeve fixedly disposed on one end of the limiting button, an ejector slider slidably disposed in the slider sleeve, an ejector spring fixedly disposed on the bottom of the ejector slider, a transmission rod one fixedly disposed on the side wall of the slider sleeve, and a return spring two fixedly disposed on the transmission rod one. The other end of the ejector spring is fixedly connected to the slider sleeve, and the other end of the return spring two is fixedly connected to the inner wall of the transmission box. The limiting block is used to block the sliding of the liquid-drawing slider on the transmission box, the return spring two is used to reset the transmission rod one, and the ejector spring can push the ejector slider upward.

[0010] As a preferred technical solution of this invention, a ratchet wheel rotatably mounted on the surface of the mounting housing, a ratchet wheel 2 coaxially fixed on the top of the ratchet wheel 1, a gear coaxially fixed on the top of the ratchet wheel 2, a rack fixed on one side of the liquid-drawing slider, the rack meshing with the gear, the gear restricting the movement of the liquid-drawing slider through the rack, a pawl rotatably mounted on the surface of the mounting housing, a pawl 2 coaxially mounted on the top of the pawl 1, the pawl 1 corresponding to the ratchet wheel 1, when the ratchet wheel 1 and the pawl 1 are in contact, preventing the liquid-drawing slider from moving toward the piston box 1, the ratchet wheel 2 corresponding to the pawl 2, when the ratchet wheel 2 and the pawl 2 are in contact, preventing the liquid-drawing slider from moving away from the piston box 1, a spring plate 1 fixed on the inner wall of the transmission box, the spring plate 1 causing the pawl 2 to contact the ratchet wheel 2, and the spring plate 2 fixed on the inner wall of the transmission box, the spring plate 2 causing the pawl 1 to contact the ratchet wheel 1.

[0011] As a preferred technical solution of this invention, a hydraulic transmission pipe is fixedly installed inside the side wall of the transmission box. The hydraulic transmission pipe is filled with liquid. An array of unlocking sliders 2 are slidably installed inside the hydraulic transmission pipe. The transmission rod 1 can push the unlocking sliders 2 to move. An unlocking slider 1 is slidably installed on the hydraulic transmission pipe. Pushing the unlocking sliders 2 to move the unlocking slider 1 can move the unlocking slider 1 to push the pawl 1 to disengage from the ratchet 1.

[0012] As a preferred technical solution of this invention, the transmission box is provided with a liquid discharge button, and pushing the liquid discharge button can disengage the pawl two from the ratchet two.

[0013] The beneficial effects of the present invention after adopting the above structure are as follows:

[0014] (1) Precise and controllable extraction volume: The limiting unit in the transmission box can select the corresponding limiting button according to clinical needs (such as 5 ml, 10 ml, 15 ml). The limiting block is pushed up by the ejector spring, which precisely limits the maximum sliding distance of the liquid extraction slider. With the transmission relationship of rack and pinion, the liquid extraction stroke is converted into a quantified volume, avoiding manual control errors, reducing the risk of over-extraction, and improving the accuracy of operation;

[0015] (2) Controllable extraction speed: Through the design of the hydraulic damper, when the piston moves in the piston box, the hydraulic oil generates a damping effect through the micro-through hole, which hinders the piston from quickly returning to its original position, thereby limiting the movement speed of the extraction slider, avoiding the bone marrow fluid being extracted too quickly due to unstable operating force of medical staff, reducing the risk of patient pain and bone marrow tissue damage, and ensuring sample quality.

[0016] (3) Effectively prevent liquid backflow: The bidirectional locking structure of ratchet one and pawl one, ratchet two and pawl two restricts the movement of the liquid extraction slider away from the piston box during the extraction process by pawl two, preventing the piston rod from retracting, avoiding the backflow of bone marrow fluid to the puncture site, reducing the risk of infection and hematoma, and ensuring sample integrity at the same time.

[0017] (4) Reduce infection risk and facilitate disinfection: The disposable syringe body is detachable and snap-fit, avoiding the disinfection risks of reusing syringes; the hydraulic damper is detachable and easy to disinfect other parts. Combined with the quick-fixing structure of the limiting arc plate, it not only ensures the convenience of operation, but also reduces the risk of cross-infection from the structure, which meets medical safety standards. Attached Figure Description

[0018] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the invention and do not constitute a limitation thereof.

[0019] Figure 1 This is a schematic diagram of the overall structure of a bone marrow aspiration device according to the present invention.

[0020] Figure 2 This is a schematic diagram of the connection structure between the limit button and the transmission box in this invention;

[0021] Figure 3 This is a cross-sectional view of the hydraulic damper structure in the invention;

[0022] Figure 4 This is a schematic diagram of the connection structure between the liquid-drawing slider and the snap-fit ​​piston in this invention;

[0023] Figure 5 This is a schematic diagram of the connection structure between the liquid-drawing slider and the rack in this invention;

[0024] Figure 6 for Figure 5 Enlarged view of the local structure at point A;

[0025] Figure 7 This is a schematic diagram of the connection structure of the limiting unit in this invention;

[0026] Figure 8 This is a schematic diagram of the connection structure between the liquid dispensing button and the second pawl in this invention;

[0027] Figure 9 This is a schematic diagram of the connection structure between the unlocking slider and the ratchet in this invention.

[0028] In the attached diagram: 1. Mounting housing; 2. Limiting arc plate; 3. Hydraulic damper; 4. Syringe body; 5. Transmission box; 6. Liquid drawing slider; 7. Piston box one; 8. Limiting unit; 9. Limiting button; 10. Transmission rod two; 11. Piston rod; 12. Snap-fit ​​piston; 13. Piston one; 14. Piston two; 15. Return spring one; 16. Piston box two; 17. Rack; 18. Ratchet one; 19. Ratchet two; 20. Gear; 21. Pad one; 22. Pad two; 23. Ejection slider; 24. Ejection spring; 25. Slider sleeve; 26. Transmission rod one; 27. Return spring two; 28. Liquid dispensing button; 29. ​​Spring plate one; 30. Spring plate two; 31. Unlocking slider one; 32. Hydraulic transmission pipe; 33. Unlocking slider two; 34. Limiting block. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Example 1, as Figures 1-9As shown, the bone marrow aspiration device of this embodiment includes a mounting shell 1, a transmission box 5 fixedly mounted on the mounting shell 1, and a limiting arc plate 2 rotatably mounted on the mounting shell 1. A syringe body 4 is detachably snapped into the mounting shell 1. A piston rod 11 is slidably mounted inside the syringe body 4. The snap-fit ​​design facilitates the use of disposable syringes for aspiration, avoiding the difficulties in disinfection caused by using fixed reusable syringes, thus preventing wound infection. A piston box 7 is fixedly mounted on the side wall of the mounting shell 1. A snap-fit ​​piston 12 is slidably mounted inside the mounting shell 1. One end of the piston rod 11 is snapped into the snap-fit ​​piston 12. A hydraulic damper 3 is detachably fixed to one end of the piston box 7. The detachable design facilitates the removal of the hydraulic damper 3 for device disinfection. The pressure damper 3 includes a piston box 16 fixedly disposed at one end of the piston box 1 7 and a piston 14 slidably disposed within the piston box 16. The piston box 16 is provided with several small through holes. The piston box 16 is filled with hydraulic oil. The hydraulic oil prevents the piston 14 from moving too quickly within the piston box 16 due to the return spring 15, thus avoiding the extraction of bone marrow fluid too quickly. One end of the piston 14 is fixedly provided with the return spring 15, and the other end of the return spring 15 is fixedly connected to the piston box 16. The function of the return spring 15 is to reset the piston 14. The other end of the piston 14 is fixedly provided with a piston 13, which is in contact with the locking piston 12. A fluid extraction slider 6 is slidably disposed on the mounting shell 1. A transmission rod 10 is fixedly disposed between the fluid extraction slider 6 and the locking piston 12.

[0032] The transmission box 5 is equipped with a series of limiting units 8, which can restrict the movement of the liquid-drawing slider 6. The limiting unit 8 includes a limiting block 34 slidably disposed on the top wall of the transmission box 5, a limiting button 9 slidably disposed on the side wall of the transmission box 5, a slider sleeve 25 fixedly disposed on one end of the limiting button 9, an ejector slider 23 slidably disposed in the slider sleeve 25, an ejector spring 24 fixedly disposed on the bottom of the ejector slider 23, a transmission rod 26 fixedly disposed on the side wall of the slider sleeve 25, and a reset spring 27 fixedly disposed on the transmission rod 26. The other end of the ejector spring 24 is fixedly connected to the slider sleeve 25, and the other end of the reset spring 27 is fixedly connected to the inner wall of the transmission box 5. The limiting block 34 is used to block the sliding of the liquid-drawing slider 6 on the transmission box 5, the reset spring 27 is used to reset the transmission rod 26, and the ejector spring 24 can push the ejector slider 23 upward.

[0033] The mounting housing 1 has a ratchet 18 rotatably mounted on its surface. A second ratchet 19 is coaxially fixed to the top of the first ratchet 18, and a gear 20 is coaxially fixed to the top of the second ratchet 19. A rack 17 is fixed to one side of the liquid-drawing slider 6, meshing with the gear 20. The gear 20 can restrict the movement of the liquid-drawing slider 6 through the rack 17. A pawl 21 rotatably mounts on the surface of the mounting housing 1, and a second pawl 22 is coaxially rotatably mounted to the top of the pawl 21. The pawl 21 is opposite to the first ratchet 18. When ratchet 18 and pawl 21 are in contact, they can prevent the liquid-drawing slider 6 from moving toward the piston box 7. Ratchet 29 corresponds to pawl 22. When ratchet 29 and pawl 22 are in contact, they can prevent the liquid-drawing slider 6 from moving away from the piston box 7. A spring plate 29 is fixedly provided on the inner wall of the transmission box 5. The spring plate 29 causes pawl 22 to contact ratchet 29. A spring plate 30 is fixedly provided on the inner wall of the transmission box 5. The spring plate 30 causes pawl 21 to contact ratchet 18.

[0034] Hydraulic transmission pipe 32 is fixedly installed inside the side wall of transmission box 5. Hydraulic transmission pipe 32 is filled with liquid. Unlocking slider 2 33 is arranged in an array inside hydraulic transmission pipe 32. Transmission rod 1 26 can push unlocking slider 2 33 to move. Unlocking slider 1 31 is slidably installed on hydraulic transmission pipe 32. Pushing unlocking slider 2 33 to move can move unlocking slider 1 31 to push pawl 1 21 to disengage from ratchet 1 18.

[0035] The transmission box 5 is equipped with a liquid discharge button 28, which can be pushed to disengage the pawl 22 from the ratchet 19.

[0036] In practical use: Separate the mounting shell 1 and the limiting arc plate 2. Attach the syringe body 4 to the mounting shell 1. Attach the piston rod 11 to the locking piston 12 at one end outside the syringe body 4. Rotate the limiting arc plate 2 to fix its movable end to the mounting shell 1, thus securing the syringe body 4. Select the limiting unit 8 according to the amount of bone marrow to be extracted. For example, select the first limiting unit 8 to extract 5 ml, the second to extract 10 ml, and the third to extract 15 ml. After selection, press the corresponding limiting button 9. The limiting button 9 moves the slider sleeve 25, which in turn moves the transmission rod 26. The transmission rod 26 then contacts the unlocking slider 33, squeezing it to release the release mechanism. Locking slider 2 33 moves toward hydraulic transmission tube 32, unlocking slider 2 33 squeezes the liquid in hydraulic transmission tube 32, thereby causing unlocking slider 1 31 to extend. Unlocking slider 1 31 extends and drives pawl 1 21 to rotate and disengage from ratchet 1 18. The movement of the suction slider 6 will drive rack 17 to move, rack 17 to rotate gear 20, gear 20 to rotate ratchet 1 18 and ratchet 2 19. If ratchet 1 18 contacts pawl 1 21, ratchet 1 18 will obstruct the movement of suction slider 6 toward piston box 1 7. Pawl 1 21 no longer restricts the rotation of ratchet 1 18, thus ratchet 1 18 no longer restricts the movement of suction slider 6 toward piston box 1 7, avoiding medical accidents caused by forgetting to set the suction volume. The movement of ejector spring 24 will also... The ejector slider 23 moves upwards. When the ejector slider 23 moves to the bottom of the limiting block 34, it is no longer restricted by the top wall of the transmission box 5 and moves upwards. The upward movement of the ejector slider 23 causes the limiting block 34 to move upwards. After the limiting block 34 moves upwards, it can limit the maximum sliding distance of the suction slider 6, thereby precisely controlling the volume extracted. After the ejector spring 24 moves upwards and ejects the limiting block 34, the ejector spring 24 enters the top wall of the transmission box 5, thus completing the fixation of the transmission rod 26. This ensures that the pawl 21 will not restrict the movement of the suction slider 6 during the extraction process. Moving the suction slider 6 causes the locking piston 12 to move, which in turn causes the piston rod 11 to move, thereby extracting bone marrow. During the extraction process, hydraulic pressure... The movable end of the damper 3 contacts the locking piston 12. The hydraulic damper 3 prevents excessively fast extraction, which could harm the patient. Simultaneously, the pawl 22 contacts the ratchet 19, which, via the gear 20 and rack 17, restricts the movement of the extraction slider 6 away from the piston box 7, preventing bone marrow fluid backflow, which could increase the risk of infection and damage the puncture site. After extraction, to release the bone marrow fluid from the syringe body 4, press the dispensing button 28. The dispensing button 28 causes the pawl 22 to disengage from the ratchet 19, and the ratchet 19 no longer restricts the movement of the extraction slider 6 away from the piston box 7. The movable end of the hydraulic damper 3 pushes the locking piston 12, which in turn pushes the piston rod 11 to release the bone marrow fluid. After release, press the limit block 34.The limiting block 34 drives the ejector slider 23 to move downwards and disengage from the top wall of the transmission box 5. The transmission box 5 no longer restricts the movement of the ejector slider 23, and the transmission rod 26 resets under the action of the return spring 27. Thus, the entire device is reset for future use.

[0037] In summary, if a person skilled in the art, inspired by this invention, designs a similar structure and embodiment without departing from the spirit of the invention, such design should fall within the scope of protection of this invention.

Claims

1. A bone marrow aspiration device, comprising a mounting shell (1), a transmission box (5) fixedly mounted on the mounting shell (1), and a limiting arc plate (2) rotatably mounted on the mounting shell (1), characterized in that: The mounting housing (1) is detachably snapped into a syringe body (4). A piston rod (11) is slidably disposed inside the syringe body (4). A piston box (7) is fixedly disposed on the side wall of the mounting housing (1). A snap-fit ​​piston (12) is slidably disposed inside the mounting housing (1). One end of the piston rod (11) is snapped into the snap-fit ​​piston (12). A hydraulic damper (3) is detachably fixedly disposed on one end of the piston box (7). The movable end of the hydraulic damper (3) is fixedly connected to the snap-fit ​​piston (12). A liquid-drawing slider (6) is slidably disposed on the mounting housing (1). A transmission rod (10) is fixedly disposed between the liquid-drawing slider (6) and the snap-fit ​​piston (12). A limiting unit (8) is arrayed inside the transmission box (5). The limiting unit (8) corresponds to the liquid-drawing slider (6). The limiting unit (8) includes a limiting block (34) slidably disposed on the top wall of the transmission box (5), a limiting button (9) slidably disposed on the side wall of the transmission box (5), a slider sleeve (25) fixedly disposed on one end of the limiting button (9), an ejector slider (23) slidably disposed in the slider sleeve (25), an ejector spring (24) fixedly disposed on the bottom of the ejector slider (23), a transmission rod (26) fixedly disposed on the side wall of the slider sleeve (25), and a reset spring (27) fixedly disposed on the transmission rod (26). The other end of the ejector spring (24) is fixedly connected to the slider sleeve (25), and the other end of the reset spring (27) is fixedly connected to the inner wall of the transmission box (5). The transmission box (5) is fixedly provided with a hydraulic transmission pipe (32) inside the side wall. The hydraulic transmission pipe (32) is provided with an array of sliding unlocking sliders (33), which correspond to the transmission rod (26). The mounting housing (1) is rotatably provided with a ratchet wheel (18) on the top, and a ratchet wheel (19) is coaxially fixed on the top of the ratchet wheel (18). The liquid-drawing slider (6) is connected to the ratchet wheel (19) in a transmission connection. A gear (20) is fixedly mounted on the top of ratchet 2 (19) on the same axis. A rack (17) is fixedly mounted on one side of the liquid-drawing slider (6). The rack (17) meshes with the gear (20). The gear (20) can restrict the movement of the liquid-drawing slider (6) through the rack (17). A pawl 1 (21) is rotatably mounted on the surface of the mounting housing (1). A pawl 2 (22) is rotatably mounted on the top of the pawl 1 (21) on the same axis. The pawl 1 (21) corresponds to the ratchet 1 (18). When the ratchet 1 (18) and the pawl 1 (21) are in contact, they can prevent the liquid-drawing slider (6) from moving toward the piston box 1 (7). The ratchet 2 (19) corresponds to the pawl 2 (22). When the ratchet 2 (19) and the pawl 2 (22) are in contact, they can prevent the liquid-drawing slider (6) from moving away from the piston box 1 (7). The transmission box (5) is slidably provided with a liquid dispensing button (28), which corresponds to the second ratchet (19); The hydraulic transmission pipe (32) is slidably provided with an unlocking slider (31), which corresponds to the ratchet (18); The limiting unit (8) can select the corresponding limiting button (9) according to different aspiration volumes. The limiting block (34) is pushed up by the ejector spring (24) to accurately limit the maximum sliding distance of the aspiration slider (6) and convert the aspiration stroke into a quantified aspiration volume. The ratchet one (18) and the pawl one (21), the ratchet two (19) and the pawl two (22) form a two-way locking structure. During the aspiration process, the piston rod (11) is prevented from retracting to avoid the bone marrow fluid flowing back to the puncture site.

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