Bone marrow aspiration needle

Abstract

The utility model relates to puncture tool technical field, concretely for bone marrow puncture needle, including needle tube, needle tube is used for puncture extraction bone marrow, the lower extreme of needle tube is installed with needle tube seat, the inside of needle tube is provided with core needle, the lower extreme of core needle is installed with core needle seat, the end of adjusting sleeve is provided with inclined annular surface to adapt the use condition of 45 degree -60 degree inclined needle insertion of sternum bone marrow puncture, core needle seat is equipped with the lock catch, the limiting block is set up on needle tube seat, when the tip of core needle is pressed, the lock catch is hooked needle tube seat through the cooperation with limiting block, prevents core needle from retreating, the convex point is equipped on core needle seat for preventing core needle seat from rotating freely and taking out. In the bone marrow puncture needle, the inclined annular surface of adjusting sleeve end head, perfect adaptation 45 degree -60 degree inclined needle insertion of sternum bone marrow puncture use condition, solve the problem that the small observation field of operator can be observed when the traditional puncture needle punctures, and the discomfort of patient skin, make puncture operation more accurate, convenient.

Description

Technical Field

[0001] This utility model relates to the field of puncture tool technology, specifically to bone marrow puncture needles. Background Technology

[0002] In the process of bone marrow aspiration diagnosis, sternal bone marrow aspiration is a highly valuable diagnostic method due to the high quality and non-dilutable nature of the bone marrow fluid. The commonly used puncture site is located at the intersection of the manubrium or body of the sternum and the first and second intercostal spaces. The bone in this area is relatively thin, and the puncture depth generally does not exceed 1 cm (0.5 cm for children), and a needle insertion angle of 45°-60° must be maintained.

[0003] Currently, there are many shortcomings in commercially available bone marrow aspiration needles. Taking the patent technology with application number 201510725044.5 and authorization announcement number CN105193480B as an example, although the disclosed bone marrow aspiration needle has structures such as a beveled needle body and a coplanar beveled tip, which takes into account the drainage problem to some extent, it still cannot meet the special needs of sternal bone marrow aspiration. This bone marrow aspiration needle is not optimized for the specific angle of sternal puncture, which easily obstructs the medical staff's view of the needle tube during puncture, and causes discomfort to the patient when the puncture needle comes into contact with the patient's skin.

[0004] Clinically, due to the lack of specialized needles suitable for sternal puncture, medical staff often use conventional puncture needles or similar patented products. These needles have problems such as mismatch between the needle size and the anatomical structure of the sternum, and difficulty in precisely controlling the puncture depth. During the puncture, once the needle penetrates the sternal cortex, the needle insertion speed can easily become uncontrolled, leading to excessively deep puncture and serious complications such as pneumothorax and mediastinal hematoma. Furthermore, the rigidity and toughness of conventional puncture needles are insufficient; when used for bone puncture, the needle is prone to bending and breakage, affecting the smooth progress of the puncture procedure.

[0005] Furthermore, existing bone marrow aspiration needles have shortcomings in preventing core needle dislodgement and locking the puncture direction, affecting the stability and accuracy of the puncture. Given these issues, the iliac crest is often chosen for bone marrow aspiration in clinical practice; however, the bone marrow fluid in this area carries a high risk of dilution, complicating diagnosis. Therefore, developing a specialized needle highly adapted for sternal bone marrow aspiration is of great significance for improving the safety and accuracy of bone marrow aspiration diagnosis. Utility Model Content

[0006] The purpose of this invention is to provide a bone marrow aspiration needle to solve the problems mentioned in the background art regarding the defects of existing bone marrow aspiration needles in preventing core needle dislodgement and locking the puncture direction, which affect the stability and accuracy of puncture.

[0007] To achieve the above objectives, this utility model provides a bone marrow aspiration needle, including a needle tube for puncturing and extracting bone marrow; a needle tube seat is installed at the lower end of the needle tube, a core needle is disposed inside the needle tube, and a core needle seat is installed at the lower end of the core needle; an adjusting sleeve is fitted on the outside of the needle tube, and the end of the adjusting sleeve is provided with an inclined annular surface to adapt to the use of sternal bone marrow aspiration with a 45°-60° inclined needle insertion; the core needle seat is provided with a stop buckle, and a limiting block is provided on the needle tube seat. During puncture, when the tip of the core needle is subjected to pressure, the stop buckle hooks onto the needle tube seat through cooperation with the limiting block to prevent the core needle from retracting; the core needle seat is provided with a protrusion to prevent the core needle seat from rotating freely and falling out.

[0008] This device uses a needle tube as the execution component for bone marrow aspiration. It is securely installed and connected to the outside via a lower needle tube holder. An internal core needle assists in puncture, and the core needle holder facilitates core needle manipulation. The inclined annular surface of the adjusting sleeve end is designed to meet the specific 45°-60° insertion angle requirements of sternal bone marrow aspiration, forming a close-fitting puncture guide structure. The locking buckle of the core needle holder and the limiting block of the needle tube holder form a mechanical interlocking device. During puncture, the core needle tip is compressed, causing the locking buckle to deform and engage with the limiting block, preventing the core needle from retracting. The protrusions on the core needle holder cooperate with a specific structure on the inner wall of the needle tube holder to restrict the rotational freedom of the core needle holder, preventing accidental dislodgement.

[0009] Preferably, the adjusting sleeve is internally threaded with an adjusting seat, and the lower end of the adjusting seat is fixed to the needle tube seat.

[0010] This device features an adjusting sleeve fitted over the outside of the needle tube, which is connected to an adjusting seat via internal threads. The lower end of the adjusting seat is fixed to the needle tube seat, forming a screw drive mechanism. Based on the principle of screw drive, when the adjusting sleeve is rotated, the circular motion of the adjusting sleeve is converted into the linear motion of the adjusting seat along the needle tube axis, thereby changing the position of the adjusting seat on the needle tube.

[0011] Preferably, the adjustment seat is provided with scale markings to indicate the puncture depth.

[0012] This feature includes graduated markings on the surface of the adjustment seat. The markings precisely correspond to the axial displacement of the adjustment seat. Based on the linear relationship between the adjustment seat's movement distance and the puncture depth, the abstract parameter of puncture depth is transformed into intuitive graduated information. Medical staff can obtain real-time puncture depth data by observing the graduated markings.

[0013] Preferably, the end of the core needle is provided with a core needle bevel, and the end of the needle tube is provided with a needle tube bevel. When the stop buckle hooks onto the needle tube seat through cooperation with the limiting block, the side of the limiting block is restricted from rotating by the corresponding limiting groove side of the core needle seat. At this time, the core needle bevel matches the needle tube bevel, thereby locking the direction.

[0014] This design features beveled surfaces on both the mandrel and the needle tube end, with both surfaces having the same angle. When the mandrel seat retainer engages with the needle tube seat limiting block, the limiting block and the mandrel seat limiting groove interact, restricting the mandrel's rotation and ensuring a tight fit between the mandrel's beveled surface and the needle tube's beveled surface, forming a directional locking structure. The tightness and stability of the beveled fit ensure that the puncture direction remains unchanged during the puncture process.

[0015] Preferably, the inclination angles of the mandrel bevel and the needle tube bevel are both 45°-60°, and the edge of the mandrel bevel is provided with a 0.05-0.1mm rounded corner, and the edge of the needle tube bevel is provided with a 0.03-0.08mm cutting edge, in order to reduce tissue resistance during puncture.

[0016] This design features a rounded edge on the mandrel bevel to reduce tissue cutting and scraping during puncture; the needle bevel edge is equipped with a sharp edge to reduce puncture resistance and improve puncture efficiency. Both bevel angles are 45°-60°, which meets the mechanical requirements of sternal bone marrow aspiration, distributing the puncture force along the bevel direction and reducing vertical pressure.

[0017] Preferably, the lower end of the needle holder is provided with a Luer connector for connecting an external syringe to extract bone marrow samples.

[0018] This design incorporates a Luer connector at the lower center of the syringe barrel. Utilizing the standardized conical surface and threaded connection of the Luer connector, a quick and tight connection with the syringe is achieved. The tapered design of the conical surface ensures a tight seal, while the threaded connection ensures a stable connection.

[0019] Preferably, a handle is installed on the outside of the needle holder for applying force with the hand during puncture.

[0020] This feature includes a handle attached to the outside of the syringe holder. The shape, size, and position of the handle are designed according to ergonomic principles to conform to the natural gripping shape and force application habits of the human hand, providing medical staff with a comfortable and stable point of force application.

[0021] Preferably, the needle tube is covered with a protective sleeve to protect the needle tube when it is not in use.

[0022] This feature involves placing a protective sleeve over the outside of the needle tube. The sleeve is made of elastic or rigid material and completely encloses the needle tube when the puncture needle is not in use, forming a physical protective barrier to isolate external contaminants such as dust and bacteria, while also preventing the needle tube from being damaged by external forces such as collisions or squeezing.

[0023] Preferably, the top of the needle holder is provided with a needle insertion port, the bottom end of the needle is inserted into the needle insertion port and sealed and fixed by sealant, and the top of the core needle holder is provided with a core needle insertion port, the bottom end of the core needle is inserted into the core needle insertion port.

[0024] This design features needle insertion ports on the top of the needle holder and needle insertion ports on the top of the needle holder. A plug-in connection method is used to connect the needle, needle, and corresponding holder, and the interface gaps are filled with sealant. The plug-in structure facilitates quick assembly and disassembly, and the sealant, with its adhesive and curing properties, forms a sealing layer to prevent liquid leakage and the ingress of impurities.

[0025] Preferably, the outer surface of the adjusting sleeve is provided with axial anti-slip ridges, the height of the anti-slip ridges is 0.2-0.5mm, the width is 1-2mm, the spacing between adjacent anti-slip ridges is 2-3mm, and the number of anti-slip ridges is 6-10, so as to facilitate medical staff to rotate the adjusting sleeve for depth adjustment.

[0026] This feature incorporates axial anti-slip ridges on the outer surface of the adjustment sleeve. By increasing the surface roughness of the adjustment sleeve, and based on the principle of friction, the friction between the medical staff's hands and the adjustment sleeve is increased. The height, width, spacing, and number of the anti-slip ridges are rationally designed to optimize the amount of friction and the grip feel.

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0028] 1. The adjustable sleeve tip of this bone marrow aspiration needle is perfectly suited for sternal bone marrow aspiration with a 45°-60° angled insertion, solving the problems of limited field of view for operators and discomfort to the patient's skin during puncture with traditional needles, making the puncture operation more precise and convenient.

[0029] 2. In this bone marrow aspiration needle, the retaining buckle of the core needle seat cooperates with the limiting block of the needle tube seat to effectively prevent the core needle from retracting during puncture; the protrusions on the core needle seat can prevent the core needle seat from rotating freely and falling out; when the retaining buckle hooks onto the needle tube seat, the limiting block and the limiting groove restrict rotation, and the inclined surface of the core needle matches the inclined surface of the needle tube to lock the direction. The multiple structures ensure the stability and accuracy of the puncture process and reduce the operational risk.

[0030] 3. In this bone marrow aspiration needle, the adjusting sleeve on the outside of the needle tube is connected to the adjusting seat by threads, and the adjusting seat is marked with scale marks. Medical staff can intuitively and accurately control the puncture depth, avoiding serious complications such as pneumothorax and mediastinal hematoma caused by excessive puncture, thus improving the safety of sternal bone marrow aspiration. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0032] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0033] Figure 3 This is a schematic diagram of the exploded structure of this utility model;

[0034] Figure 4 This is a schematic diagram of the needle tube in this utility model;

[0035] Figure 5 This is a partial structural schematic diagram of the present invention;

[0036] Figure 6 This is a schematic diagram of the structure of the adjusting seat in this utility model;

[0037] Figure 7 This is a schematic diagram of the usage process of this utility model;

[0038] Figure 8 This is a schematic diagram of the recycling process of this utility model;

[0039] The meanings of the labels in the diagram are as follows:

[0040] 1. Needle tube; 11. Needle tube bevel; 2. Core needle seat; 21. Stop buckle; 22. Protrusion; 23. Limiting groove; 3. Adjusting sleeve; 31. Inclined annular surface; 32. Adjusting seat; 33. Scale marking; 4. Core needle; 41. Core needle bevel; 5. Needle tube seat; 51. Limiting block; 52. Handle end; 6. Protective sleeve. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0042] This utility model provides a bone marrow aspiration needle, such as Figure 1 , Figure 2 , Figure 3 , Figure 5As shown, the device includes a needle tube 1, which is used for puncture and aspiration of bone marrow; a needle tube seat 5 is installed at the lower end of the needle tube 1, and a core needle 4 is installed inside the needle tube 1, with a core needle seat 2 installed at the lower end of the core needle 4; an adjusting sleeve 3 is fitted on the outside of the needle tube 1, and the end of the adjusting sleeve 3 is provided with an inclined annular surface 31 to adapt to the use of sternal bone marrow puncture with a 45°-60° inclined needle insertion; the core needle seat 2 is provided with a retainer 21, and a limiting block 51 is provided on the needle tube seat 5. During puncture, when the tip of the core needle 4 is subjected to pressure, the retainer 21 hooks the needle tube seat 5 through cooperation with the limiting block 51 to prevent the core needle 4 from retracting; the core needle seat 2 is provided with a protrusion 22 to prevent the core needle seat 2 from rotating freely and falling out.

[0043] The needle tube 1, serving as the execution component for bone marrow extraction, is securely installed and connected to the outside via the needle tube seat 5 at its lower end. The internally mounted core needle 4 assists in puncture, and the core needle seat 2 facilitates the manipulation of the core needle 4. The inclined annular surface 31 at the end of the adjusting sleeve 3 is designed to meet the specific 45°-60° insertion angle requirements of sternal bone marrow puncture, forming a fitting puncture guide structure. The retaining buckle 21 on the core needle seat 2 and the limiting block 51 on the needle tube seat 5 constitute a mechanical interlocking device. During puncture, the tip of the core needle 4 is pressed, causing the retaining buckle 21 to deform and engage with the limiting block 51, preventing the core needle 4 from retracting. The protrusion 22 on the core needle seat 2 cooperates with a specific structure on the inner wall of the needle tube seat 5 to restrict the rotational freedom of the core needle seat 2, preventing accidental dislodgement. The inclined annular surface 31 of the adjusting sleeve 3 is precisely adapted to the sternal puncture angle, improving the operating view of medical staff and reducing the discomfort of patients at the puncture site; the interlocking mechanism of the latch 21 and the limiting block 51 ensures the stability of the core needle 4 during the puncture process, avoiding puncture failure or insufficient sample collection due to the core needle 4 retraction; the protrusion 22 prevents the core needle seat 2 from dislodging, ensuring the safety and reliability of the puncture operation and reducing medical risks.

[0044] In this embodiment, as Figure 2 , Figure 3 As shown, the internal thread of the adjusting sleeve 3 is connected to the adjusting seat 32, and the lower end of the adjusting seat 32 is fixed on the needle tube seat 5.

[0045] An adjusting sleeve 3 is fitted over the outside of the needle tube 1. The adjusting sleeve 3 is internally connected to an adjusting seat 32 via threads. The lower end of the adjusting seat 32 is fixed to the needle tube seat 5, forming a screw transmission mechanism. According to the principle of screw transmission, when the adjusting sleeve 3 is rotated, the circular motion of the adjusting sleeve 3 is converted into the linear motion of the adjusting seat 32 along the axial direction of the needle tube 1, thereby changing the position of the adjusting seat 32 on the needle tube 1.

[0046] This structure provides a precise and controllable mechanical means for adjusting the puncture depth. Medical staff can flexibly adjust the puncture depth by rotating the adjustment sleeve 3 according to individual patient differences and clinical needs. The operation is simple and the adjustment accuracy is high, effectively avoiding complications caused by improper puncture depth.

[0047] Specifically, such as Figure 6 As shown, the adjustment seat 32 is provided with a scale mark 33 for indicating the puncture depth.

[0048] A scale mark 33 is set on the surface of the adjusting seat 32. The scale value corresponds precisely to the axial displacement distance of the adjusting seat 32. Based on the linear relationship between the moving distance of the adjusting seat 32 and the puncture depth, the abstract parameter of puncture depth is transformed into intuitive scale information. Medical staff can obtain the current puncture depth data in real time by observing the scale mark 33.

[0049] The setting of scale mark 33 makes the puncture depth visible, which makes it easier for medical staff to accurately control the needle depth and avoid damage to the patient's vital organs due to excessive puncture, such as causing serious consequences such as pneumothorax and mediastinal hematoma, thus significantly improving the safety and accuracy of bone marrow puncture operation.

[0050] Furthermore, such as Figure 4 As shown, the end of the core needle 4 is provided with a core needle inclined surface 41, and the end of the needle tube 1 is provided with a needle tube inclined surface 11. When the stop buckle 21 hooks the needle tube seat 5 through the cooperation with the limiting block 51, the side of the limiting block 51 is restricted from rotating by the side of the corresponding limiting groove 23 of the core needle seat 2. At this time, the core needle inclined surface 41 matches the needle tube inclined surface 11, thereby locking the direction.

[0051] The beveled surface 41 at the end of the mandrel 4 and the beveled surface 11 at the end of the needle tube 1 have the same bevel angle. When the stop 21 of the mandrel seat 2 engages with the limiting block 51 of the needle tube seat 5, the limiting block 51 interacts with the limiting groove 23 of the mandrel seat 2, restricting the rotation of the mandrel 4 and ensuring that the beveled surface 41 and the beveled surface 11 fit tightly together, forming a direction-locking structure. The tightness and stability of the beveled fit ensure that the puncture direction remains unchanged during puncture.

[0052] The structure of the core needle bevel 41 and the needle tube bevel 11 can effectively reduce tissue resistance and reduce the difficulty of puncture during puncture; the matching of the two bevels locks the direction, ensuring the accuracy of the puncture path and avoiding deviation of the puncture direction from affecting the accuracy of the bone marrow sample collection position, thus providing a reliable sample for subsequent diagnosis.

[0053] Furthermore, the inclination angles of the mandrel bevel 41 and the needle tube bevel 11 are both 45°-60°, and the edge of the mandrel bevel 41 is provided with a 0.05-0.1mm rounded corner, and the edge of the needle tube bevel 11 is provided with a 0.03-0.08mm cutting edge, in order to reduce tissue resistance during puncture.

[0054] The rounded corner design of the bevel 41 edge of the core needle reduces tissue cutting and scraping during puncture; the sharp edge of the bevel 11 of the needle tube reduces puncture resistance and improves puncture efficiency. Both bevel angles are 45°-60°, which meets the mechanical requirements of sternal bone marrow aspiration, distributing the puncture force along the bevel direction and reducing vertical pressure. This solves the problems of traditional puncture needles, such as limited field of vision for the operator and discomfort to the patient's skin, making the puncture operation more precise and convenient.

[0055] The combination of rounded corners and cutting edge design significantly reduces damage to patient tissues during puncture, alleviates patient pain, and improves puncture speed and success rate; the reasonable bevel angle optimizes puncture mechanical properties, making puncture operation easier and smoother.

[0056] Furthermore, a Luer connector is provided at the lower middle part of the needle holder 5 for connecting an external syringe to extract bone marrow samples.

[0057] The Luer connector located at the lower center of the syringe barrel 5 utilizes the standardized conical surface fit and threaded connection structure of the Luer connector to achieve a quick and tight connection with the syringe. The tapered design of the conical surface ensures a tight seal, while the threaded connection ensures a stable connection.

[0058] The Luer connector provides a reliable interface for bone marrow sample extraction, allowing medical personnel to quickly connect syringes for sample collection. Its excellent sealing and stability prevent sample leakage and external contamination, ensuring the safety and quality of the sample collection process.

[0059] Furthermore, such as Figure 3 As shown, a handle end 52 is installed on the outside of the needle holder 5 for applying force with the hand during puncture.

[0060] The handle end 52 installed on the outside of the needle holder 5 is designed in shape, size and position according to ergonomic principles so that it conforms to the natural shape of human hand grip and force application habits, providing medical staff with a comfortable and stable force application point.

[0061] The design of the handle end 52 significantly improves the gripping experience for medical staff during puncture operations, increases hand stability during the operation, reduces hand fatigue, and enables medical staff to control the puncture needle more accurately and effortlessly, thereby improving the quality and efficiency of puncture operations.

[0062] Furthermore, such as Figure 1 , Figure 3 As shown, a sheath 6 is provided on the outside of the needle tube 1 for protection when the needle tube is not in use.

[0063] The sheath 6, which is fitted over the outside of the needle tube 1, is made of elastic or rigid material. When the puncture needle is not in use, it completely wraps around the needle tube 1, forming a physical protective barrier to isolate external dust, bacteria and other contaminants, while preventing the needle tube 1 from being damaged by external forces such as collisions and squeezing.

[0064] The sheath 6 effectively protects the integrity and cleanliness of the puncture needle during storage and transportation, preventing damage or contamination of the needle tube 1 that could affect its performance, ensuring that the puncture needle is in good condition during use, and reducing the risk of infection caused by puncture needle contamination.

[0065] Furthermore, the top of the needle holder 5 is provided with a needle insertion port, the bottom end of the needle 1 is inserted into the needle insertion port and sealed and fixed by sealant, the top of the needle holder 2 is provided with a needle insertion port, and the bottom end of the needle 4 is inserted into the needle insertion port.

[0066] The needle insertion port on the top of the needle holder 5 and the core needle insertion port on the top of the core needle holder 2 are connected to the corresponding holders via a plug-in joint. The interface gaps are filled with sealant. This plug-in structure facilitates quick assembly and disassembly. The sealant, with its adhesive and curing properties, forms a sealing layer to prevent liquid leakage and the entry of impurities.

[0067] The combination of the plug-in fit and the sealant makes the assembly and maintenance of the puncture needle more convenient, which is conducive to manufacturing and subsequent repair and replacement of parts; the good sealing performance can effectively prevent bone marrow sample leakage, ensure the safety of the sample collection process, and at the same time prevent external contaminants from entering and affecting sample quality.

[0068] Furthermore, the outer surface of the adjusting sleeve 3 is provided with axial anti-slip ridges. The height of the anti-slip ridges is 0.2-0.5mm, the width is 1-2mm, the spacing between adjacent anti-slip ridges is 2-3mm, and the number of anti-slip ridges is 6-10, so as to facilitate medical staff to rotate the adjusting sleeve 3 for depth adjustment.

[0069] The axial anti-slip ridges on the outer surface of the adjusting sleeve 3 increase the surface roughness of the adjusting sleeve 3, thereby increasing the friction between the medical staff's hands and the adjusting sleeve 3 based on the principle of friction. The height, width, spacing, and number of the anti-slip ridges are rationally designed to optimize the amount of friction and the grip feel.

[0070] The anti-slip ridges make it easier for medical staff to grip the puncture depth more securely when rotating the adjustment sleeve 3, preventing slippage and making the operation smoother and more precise. This effectively improves the convenience and accuracy of puncture depth adjustment and reduces adjustment errors caused by hand slippage.

[0071] When using the bone marrow aspiration needle of this invention, first check whether all components of the bone marrow aspiration needle are intact, and confirm that the needle tube 1, core needle 4, adjusting sleeve 3, etc., are securely connected. According to the patient's condition, by rotating the adjusting sleeve 3, utilizing its threaded transmission with the adjusting seat 32, and in conjunction with the scale markings 33 on the adjusting seat 32, a suitable puncture depth is preset. Cover the needle tube 1 with the protective sleeve 6 until it is removed when ready for puncture.

[0072] The medical staff holds the handle end 52 on the outside of the needle holder 5 and, according to the standard site for sternal bone marrow aspiration, places the inclined annular surface 31 of the adjusting sleeve 3 at an angle of 45°-60° against the patient's skin to guide the puncture. Pressure is applied to push the puncture needle. When the tip of the core needle 4 contacts the sternum, pressure is continued. The pressure on the core needle 4 causes the latch 21 of the core needle holder 2 to engage with the limiting block 51 of the needle holder 5, preventing the core needle 4 from retracting. Simultaneously, the protrusion 22 on the core needle holder 2 engages with the inner wall of the needle holder 5, preventing the core needle holder 2 from rotating freely and dislodging. As the puncture deepens, after the latch 21 engages with the limiting block 51, the side of the limiting block 51 is restricted from rotation by the limiting groove 23 of the core needle holder 2. The beveled surface 41 of the core needle matches the beveled surface 11 of the needle tube, locking the puncture direction. During this process, the rounded corners of the edge of the beveled surface 41 of the core needle and the cutting edge of the beveled surface 11 of the needle tube effectively reduce puncture resistance and minimize damage to the patient's tissues.

[0073] Once the puncture reaches the preset depth and is confirmed by observing the scale markings 33 on the adjustment seat 32, the Luer connector is tightly connected to the syringe, and a bone marrow sample is extracted through the syringe. The standardized conical surface and threaded connection of the Luer connector ensure a tight and secure connection, preventing sample leakage or external contamination.

[0074] After sample collection, carefully remove the puncture needle and dispose of it properly. If the puncture needle needs to be reused, clean, disinfect, and maintain it according to the standard procedure. Using the needle port at the top of the needle holder 5 and the core needle port at the top of the core needle holder 2, along with sealant, the needle 1 and core needle 4 can be easily disassembled, cleaned, and reassembled.

[0075] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A bone marrow aspiration needle, comprising a needle tube (1), characterized in that: The needle tube (1) is used for puncture and aspiration of bone marrow; a needle tube seat (5) is installed at the lower end of the needle tube (1), a core needle (4) is installed inside the needle tube (1), and a core needle seat (2) is installed at the lower end of the core needle (4); an adjustment sleeve (3) is fitted on the outside of the needle tube (1), and an inclined annular surface (31) is provided at the end of the adjustment sleeve (3) to adapt to the use of sternal bone marrow puncture with a 45°-60° inclined needle insertion; a stop buckle (21) is provided on the core tube seat (5), and a limit block (51) is provided on the needle tube seat (5). When the tip of the core needle (4) is subjected to pressure during puncture, the stop buckle (21) hooks the needle tube seat (5) through cooperation with the limit block (51) to prevent the core needle (4) from retracting; a protrusion (22) is provided on the core needle seat (2) to prevent the core needle seat (2) from rotating freely and falling out.

2. The bone marrow aspiration needle according to claim 1, characterized in that: The adjusting sleeve (3) is internally threaded with an adjusting seat (32), the lower end of which is fixed to the needle tube seat (5).

3. The bone marrow aspiration needle according to claim 2, characterized in that: The adjustment seat (32) is provided with a scale mark (33) for indicating the puncture depth.

4. The bone marrow aspiration needle according to claim 1, characterized in that: The end of the core needle (4) is provided with a core needle inclined surface (41), and the end of the needle tube (1) is provided with a needle tube inclined surface (11). When the stop buckle (21) hooks the needle tube seat (5) through cooperation with the limiting block (51), the side of the limiting block (51) is restricted from rotating by the side of the corresponding limiting groove (23) of the core needle seat (2). At this time, the core needle inclined surface (41) matches the needle tube inclined surface (11), thereby locking the direction.

5. The bone marrow aspiration needle according to claim 4, characterized in that: The inclination angles of the mandrel bevel (41) and the needle tube bevel (11) are both 45°-60°, and the edge of the mandrel bevel (41) is provided with a rounded corner of 0.05-0.1mm, and the edge of the needle tube bevel (11) is provided with a cutting edge of 0.03-0.08mm, so as to reduce tissue resistance during puncture.

6. The bone marrow aspiration needle according to claim 5, characterized in that: The lower end of the needle holder (5) is provided with a Luer connector for connecting an external syringe to extract bone marrow samples.

7. The bone marrow aspiration needle according to claim 1, characterized in that: The needle holder (5) is equipped with a handle end (52) on the outside for applying force with the hand during puncture.

8. The bone marrow aspiration needle according to claim 1, characterized in that: The needle (1) is covered with a protective sleeve (6) for protection when not in use.

9. The bone marrow aspiration needle according to claim 1, characterized in that: The needle holder (5) has a needle insertion port at the top, and the bottom end of the needle (1) is inserted into the needle insertion port and sealed and fixed by sealant. The needle holder (2) has a needle insertion port at the top, and the bottom end of the needle (4) is inserted into the needle insertion port.

10. The bone marrow aspiration needle according to claim 1, characterized in that: The outer surface of the adjusting sleeve (3) is provided with axial anti-slip ridges. The height of the anti-slip ridges is 0.2-0.5mm, the width is 1-2mm, the spacing between adjacent anti-slip ridges is 2-3mm, and the number of anti-slip ridges is 6-10, so as to facilitate medical staff to rotate the adjusting sleeve (3) for depth adjustment.

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