Bone quality puncture sampling needle

Abstract

This utility model discloses a bone aspiration sampling needle, belonging to the field of medical devices. One end of the outer needle body is serrated, and an axial sample receiving cavity is provided inside the outer needle. One end of the inner needle body is equipped with a drill bit. The inner needle body is detachably fitted into the sample receiving cavity, with the drill bit extending out of the serrated end of the sample receiving cavity. The outer wall of the inner needle body fits against the inner wall of the serrations. After the drill bit penetrates the cortical bone of the lesion, the inner needle is withdrawn, and only the outer needle advances. During the advancement of the outer needle, the serrations cut the bone marrow, and the cut bone marrow enters the sample receiving cavity. The outer needle is withdrawn, and the bone marrow sample is extracted, preserving the original appearance and structure of the bone marrow sample. A drainage connector is also provided. The outer needle is connected to a flushing device through the drainage connector, allowing for the injection of medication to treat and flush the bone lesion, or for the extraction of diseased bone marrow and waste fluid through a drainage device. The sample receiving cavity can also be cleaned through the drainage connector.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically a bone puncture sampling needle. Background Technology

[0002] Bone marrow aspiration is a minimally invasive treatment technique that involves extracting a small amount of bone marrow fluid or tissue using a specialized needle. This is used to analyze the morphology, structure, and composition of bone marrow cells, thereby aiding in the diagnosis, investigation of the cause and extent of osteonecrosis, and assessment of treatment effectiveness. It is one of the core examination methods commonly used in orthopedics, essentially involving the direct acquisition of bone marrow samples for laboratory analysis.

[0003] Current sampling methods involve drilling a sampling needle into the bone marrow, which breaks the bone marrow into pieces before aspirating it. This process destroys the original morphology of the diseased bone marrow, making it impossible to observe the scale of the lesion or the appearance of the diseased tissue for basic assessment. The only solution is a biopsy, which requires tissue processing and usually takes a long time, hindering timely intervention by doctors. Furthermore, healthy bone marrow is often present in the broken bone marrow samples, which may result in insufficient representativeness of the sample when bone marrow hematopoietic function is mildly abnormal in the early stages, affecting the biopsy results. Utility Model Content

[0004] The purpose of this invention is to provide a bone aspiration sampling needle to solve the problems of existing sampling needles that destroy the original morphology of the diseased bone marrow, resulting in insufficient sample representativeness and affecting biopsy results.

[0005] This utility model provides a bone aspiration sampling needle, comprising: The outer needle includes an outer needle body, one end of which is machined with serrations, and the inner side of the outer needle has a sample receiving cavity that penetrates the outer needle along the axial direction. The inner needle includes an inner needle body, one end of which is machined with a drill bit. The inner needle body is detachably fitted into the sample receiving cavity, and the drill bit extends out of the sample receiving cavity at the serrated end. The outer wall of the inner needle body is completely fitted with the inner wall of the serration.

[0006] A further embodiment: The outer needle body has a connecting sub-component at the end away from the saw teeth, and the inner needle body has a connecting female component at the end away from the drill bit. When the inner needle body is fitted into the sample receiving cavity, it is fixedly connected to the connecting female component through the connecting sub-component.

[0007] A further solution: The connecting component is a cylinder fixed to the end of the outer needle body away from the saw teeth, and the end of the connecting component away from the outer needle body is provided with a threaded joint. The connecting female is a hollow cylinder fixed to the end of the inner needle body away from the drill bit. One end of the connecting female is fixedly connected to the inner needle body and is provided with a threaded sleeve adapted to the threaded connector. The other end is an open end for the connecting female to be inserted into.

[0008] A further embodiment: the surface of the connecting sub-component is provided with a protruding post, the surface of the connecting female component is provided with a through groove communicating with the open end along the axial direction, and a retaining groove communicating with the through groove is also provided. The outer diameter of the protruding post is smaller than the width of the through groove and the retaining groove, and the meshing thread of the threaded sleeve and the threaded joint is less than one revolution.

[0009] A further solution includes a drainage connector, one end of which is detachably connected to the end of the connecting component with a threaded connector, and the connecting component has a passageway inside that communicates with the sample receiving cavity and the drainage connector.

[0010] A further solution: The connecting component has a handle at the end near the saw teeth, and the handle has anti-slip texture.

[0011] A further solution: The outer surface of the outer needle body is provided with scale lines.

[0012] A further solution: the diameter of the outer needle body gradually decreases from the middle towards the end near the serration.

[0013] A further solution: The end of the inner needle body away from the drill bit is provided with a connector.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Before sampling, the inner needle body is fitted into the sample receiving cavity, which strengthens the structural strength of the sampling needle. After the drill bit penetrates the bone cortex of the lesion, the inner needle is withdrawn. Since the bone marrow is much less hard than the bone cortex, it can be drilled by the outer needle alone. During the advance of the outer needle, the saw teeth cut the bone marrow. The cut bone marrow will enter the sample receiving cavity. The outer needle will then withdraw and extract the bone marrow sample. During the entire sampling process, the bone marrow will not be broken, and its original appearance structure will be preserved. The extracted sample can be used by professionals to observe the appearance structure and make a preliminary judgment on the cause of the disease. Healthy bone marrow can also be removed for biopsy to improve the representativeness of the sample and facilitate the quantitative analysis of key indicators.

[0015] 2. The inner and outer needles are connected by a threaded connector and a threaded sleeve. When the threaded connector or threaded sleeve is rotated, the protrusion also moves into the slot. The use of both threaded and snap-fit ​​connection methods improves the connection stability between the inner and outer needles.

[0016] 3. It is also equipped with a drainage connector. The external needle is connected to the flushing device through the drainage connector. It can inject drugs into the bone lesion site for treatment, flush the bone lesion site, or connect to the drainage device through the drainage connector to extract the diseased bone marrow and waste fluid. It can also clean the sample receiving cavity through the drainage connector. Attached Figure Description

[0017] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the inner needle in a preferred embodiment of the present invention.

[0020] Figure 3 This is a partial structural diagram of the inner needle in a preferred embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the structure of the outer needle in a preferred embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the connection between the outer needle and the drainage connector in a preferred embodiment of the present invention.

[0023] In the diagram: 1. Inner needle; 11. Inner needle body; 12. Connecting female part; 121. Through groove; 122. Slot; 13. Connector; 2. Outer needle; 21. Outer needle body; 22. Connecting female part; 221. Protrusion; 222. Threaded joint; 23. Handle; 3. Drainage joint. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0025] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0026] In the description of this utility model, it should be understood that the use of terms such as "first" and "second" to define the components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0029] Please see Figures 1-4 As shown, this embodiment provides a bone aspiration needle, comprising: The outer needle 2 includes an outer needle body 21, one end of which is machined with serrations, and the outer needle 2 has a sample receiving cavity that penetrates the outer needle 2 along the axial direction. Inner needle 1, the inner needle 1 includes an inner needle body 11, one end of which is machined with a drill bit; The inner needle body 11 is detachably fitted into the sample receiving cavity. The drill bit extends out of the sample receiving cavity at the serrated end. The outer wall of the inner needle body 11 is completely fitted with the inner wall of the serration. Before the inner needle body 11 is withdrawn from the sample receiving cavity, bone fragments generated during the bone drilling process will not enter the sample receiving cavity, thus avoiding increasing sample impurities. The small amount of bone fragments can be absorbed by the human body.

[0030] Before sampling, the inner needle body 11 is fitted into the sample receiving cavity, which strengthens the structural strength of the sampling needle and facilitates its penetration of hard cortical bone. The serrations and drill bit are located at the same end, and the other ends of the inner needle 1 and outer needle 2 are detachably connected together. The end of the inner needle body 11 away from the drill bit is provided with a connector 13, which is connected to a driving device. The driving device can drive the sampling needle to rotate and drill, and can also drive the outer needle to move linearly. The driving device is existing technology, and its structure and working principle will not be described in detail. After the drill bit penetrates the cortical bone of the lesion, the inner needle 1 is withdrawn. Since the bone marrow is much less hard than the cortical bone, it can be drilled by the outer needle 2 alone. During the advance of the outer needle 2, the serrations cut the bone marrow, and the cut bone marrow enters the sample receiving cavity. The outer needle 2 is withdrawn, and the outer needle 2 extracts the bone marrow sample. During the entire sampling process, the bone marrow is not broken and its original appearance structure is preserved. Because healthy bone marrow, diseased bone marrow, and bone marrow from different causes have different appearances and structures, the extracted samples can be used by professionals to observe the appearance and structure, make a preliminary judgment on the cause, and facilitate timely intervention. Healthy bone marrow can also be removed for biopsy, improving sample representativeness and facilitating quantitative analysis of key indicators. After treatment, samples can be taken again via bone marrow aspiration needle during follow-up examinations to assess the treatment and recovery progress.

[0031] In some embodiments, please refer to Figures 2-4 As shown, the outer needle body 21 has a connecting part 22 at the end away from the saw teeth, and the inner needle body 11 has a connecting part 12 at the end away from the drill bit. When the inner needle body 11 is fitted into the sample receiving cavity, it is fixedly connected to the connecting part 12 through the connecting part 22.

[0032] Preferably, the connecting part 22 is a cylinder fixed to the end of the outer needle body 21 away from the saw teeth, and the end of the connecting part 22 away from the outer needle body 21 is provided with a threaded connector 222; the connecting part 12 is a hollow cylinder fixed to the end of the inner needle body 11 away from the drill bit, one end of the connecting part 12 is fixedly connected to the inner needle body 11 and is provided with a threaded sleeve adapted to the threaded connector 222, and the other end is an open end for the connecting part 22 to be inserted into the hollow cavity of the connecting part 12.

[0033] The inner needle 1 and the outer needle 2 are connected by threads. During the puncture, the rotation direction of the sampling needle is consistent with the screwing direction of the thread connection, which can ensure the stability of the connection between the inner needle 1 and the outer needle 2 and make the inner needle 1 and the outer needle 2 rotate coaxially.

[0034] In some embodiments, please refer to Figures 2-4 As shown, the surface of the connecting sub-component 22 is provided with a protrusion 221, and the surface of the connecting female component 12 is provided with a through groove 121 communicating with the open end along the axial direction, and also with a retaining groove 122 communicating with the through groove 121. The retaining groove 122 extends from the end communicating with the through groove 121 in a direction away from the through groove 121, and the extension direction is slightly inclined towards the threaded sleeve end relative to the circumference of the connecting female component 12. The retaining groove 122 is adapted to the thread of the threaded sleeve, which facilitates the rotational engagement of the threaded sleeve and the threaded connector 222. When the connecting female component 12 and the connecting sub-component 22 move relative to each other axially, the protrusion 221 is simultaneously engaged in the retaining groove 122. The outer diameter of the protrusion 221 is smaller than the width of the through groove 121 and the retaining groove 122, and the engagement thread of the threaded sleeve and the threaded connector 222 is less than one revolution.

[0035] When inserting the inner needle 1 into the outer needle 2, the protrusion 221 needs to be aligned with the through groove 121. The protrusion 221 will move within the through groove 121. When inserted into place, the position of the protrusion 221 within the through groove 121 corresponds to the slot 122. Then, rotate the inner needle 1 and / or the outer needle 2 to make the threaded sleeve and the threaded connector 222 engage. At the same time, the protrusion 221 will move into the slot 122 and contact the closed end of the slot 122. The use of both screw connection and snap connection improves the connection stability between the inner needle 1 and the outer needle 2.

[0036] In some embodiments, please refer to Figure 1 , Figure 4 As shown, the connecting sub-component 22 has a handle 23 near the serration, and the handle 23 has anti-slip texture. Before inserting or withdrawing the inner needle 1, the sampling needle needs to be separated from the drive structure. At this time, the operator can hold the sampling needle through the handle 23. When inserting or withdrawing the inner needle 1, the operator can hold the outer needle 2 with one hand through the handle 23 and hold the connecting female component 12 with the other hand to operate.

[0037] In some embodiments, please refer to Figure 1 , Figure 4 As shown, the diameter of the outer needle body 21 gradually decreases from the middle towards the end near the serration, forming a cone. The diameter difference of the cone is 0.2 mm for every 5 cm of length. When drilling hard cortical bone, this allows for gradual hole enlargement, preventing cracks in the bone and causing damage. Furthermore, the outer surface of the outer needle body 21 is provided with scale lines to display the sampling length.

[0038] The puncture needles are made of 304 stainless steel and 316L stainless steel and must undergo strict "cleaning-disinfection-sterilization" treatment.

[0039] Work process reference: First, the "suspicious lesion site" is located through imaging examination. Before the formal bone puncture, the puncture needle must be assembled. The inner needle 1 is inserted into the sample receiving cavity until the handle 23 abuts against the open end wall of the connecting female part 12. At this time, the connecting female part 22 is also inserted into the hollow cavity of the connecting female part 12, and the position of the protrusion 221 in the through groove 121 corresponds to the slot 122. Then, the inner needle 1 and / or the outer needle 2 are rotated to make the threaded sleeve and the threaded connector 222 threadedly engage. At the same time, the protrusion 221 will move into the slot 122 and contact the closed end of the slot 122, completing the connection and fixation of the inner needle 1 and the outer needle 2. Connect the sampling needle to the drive device via connector 13, enabling the drive device to drive the inner needle 1 and outer needle 2 to rotate coaxially. Aim the sampling needle at the suspected lesion site and activate the drive device's rotational function. With the assistance of on-site fluoroscopy, drive the sampling needle to rotate and drill through the hard cortical bone (during the puncture, carefully observe the fluoroscopic image and the scale lines on the outer surface of the outer needle body 21). Then, turn off the drive device. Separate the sampling needle from the drive device and remove the inner needle 1. Connect the outer needle 2 to the drive device via connector 13 and activate the drive device's forward function, allowing the outer needle 2 to travel within the bone marrow cavity. During this journey, the bone marrow it passes through will enter the sample receiving cavity. Observe the scale lines according to the preset sampling depth to determine the forward distance of the outer needle 2. Once in position, turn off the drive device and then activate its retraction function to withdraw the outer needle 2. A flat-head pusher can be used to push the sample out of the sample receiving cavity, completing the sampling process. The obtained sample is a cylindrical elongated structure, retaining the original morphology of the bone marrow sample, which can be used for external structural observation. Flat-head push rods are existing technology, and their structure and working principle will not be elaborated here.

[0040] In some embodiments, please refer to Figure 4 , Figure 5As shown, it also includes a drainage connector 3. One end of the drainage connector 3 is detachably connected to the end of the connecting component 22 with a threaded connector 222. The connecting component 22 has a passageway inside that communicates with the sample receiving cavity and the drainage connector 3. When connecting the outer needle 2 and the drainage connector 3, one end of the drainage connector 3 is sealed and fitted onto the end of the connecting component 22 with the threaded connector 222. The end wall of the connecting component 22 with the threaded connector 222 has a through hole, which connects the drainage connector 3 and the passageway. The other end of the drainage connector 3 is connected to the outlet pipe of the flushing device, allowing medication to be injected into the bone lesion site for treatment and flushing of the bone lesion site through the passageway and the sample receiving cavity. Alternatively, the drainage connector 3 can be connected to the drainage pipe of the drainage device, allowing the extraction of diseased bone marrow and waste fluid through the sample receiving cavity, the passageway, and the drainage connector 3, thus expanding the function of the puncture sampling needle. The drainage connector 3 can also be connected to the outlet pipe of the flushing device to clean the sample receiving cavity and the passageway. The drain connector 3 is selected from the existing Luer connector to ensure a stable and sealed connection between the drain connector 3 and the connecting component 22 and the equipment pipeline. A Luer connector with a valve can be selected to facilitate the control of pipeline opening and closing.

[0041] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A bone aspiration sampling needle, characterized in that, include: The outer needle (2) includes an outer needle body (21), one end of which is machined with serrations, and the sample receiving cavity that penetrates the outer needle (2) is provided axially inside the outer needle (2); The inner needle (1) includes an inner needle body (11), and a drill bit is machined at one end of the inner needle body (11); The inner needle body (11) is detachably fitted into the sample receiving cavity, and the drill bit extends out of the sample receiving cavity at the serrated end. The outer wall of the inner needle body (11) is completely fitted with the inner wall of the serration.

2. The bone aspiration sampling needle according to claim 1, characterized in that, The outer needle body (21) has a connecting part (22) at the end away from the saw teeth, and the inner needle body (11) has a connecting part (12) at the end away from the drill bit. When the inner needle body (11) is fitted into the sample receiving cavity, it is fixedly connected to the connecting part (22) through the connecting part (12).

3. The bone aspiration sampling needle according to claim 2, characterized in that, The connecting component (22) is a cylinder fixed to the end of the outer needle body (21) away from the saw teeth, and the end of the connecting component (22) away from the outer needle body (21) is provided with a threaded connector (222). The connecting female part (12) is a hollow cylinder fixed to one end of the inner needle body (11) away from the drill bit. One end of the connecting female part (12) is fixedly connected to the inner needle body (11) and is provided with a threaded sleeve that is compatible with the threaded connector (222). The other end is an open end for the connecting female part (22) to be inserted into the connecting female part (12).

4. The bone aspiration needle according to claim 3, characterized in that, The surface of the connecting sub-part (22) is provided with a protrusion (221), and the surface of the connecting female part (12) is provided with a through groove (121) communicating with the open end along the axial direction, and a slot (122) communicating with the through groove (121) is also provided. The outer diameter of the protrusion (221) is smaller than the width of the through groove (121) and the slot (122), and the meshing thread of the threaded sleeve and the threaded joint (222) is less than one revolution.

5. A bone aspiration needle according to claim 3 or 4, characterized in that, It also includes a drainage connector (3), one end of which is detachably connected to the other end of the connecting sub-component (22) which has a threaded connector (222). The connecting sub-component (22) has a passageway inside that communicates with the sample receiving cavity and the drainage connector (3).

6. A bone aspiration needle according to any one of claims 2-4, characterized in that, The connecting component (22) has a handle (23) at one end near the saw teeth, and the handle (23) has anti-slip texture.

7. A bone aspiration needle according to claim 1, characterized in that, The outer surface of the outer needle body (21) is provided with scale lines.

8. A bone aspiration needle according to claim 1, characterized in that, The diameter of the outer needle body (21) gradually decreases from the middle towards the end near the serration.

9. A bone aspiration sampling needle according to claim 1, characterized in that, The inner needle body (11) has a connector (13) at the end away from the drill bit.

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