Lumbar puncture needle

Abstract

The utility model relates to a lumbar puncture needle which comprises a puncture needle tube and a hard needle core. The puncture needle tube comprises a linear section needle tube and a bent section needle tube which is in angle connection with one end of the linear section needle tube; the needle tube seat is connected with the other end of the linear section needle tube, and the linear section needle tube, the bent section needle tube and the needle tube seat are hollow and are used for allowing the needle core to penetrate through; the hard needle core comprises a first fixed needle core body and a deformed needle core body connected with one end of the first fixed needle core body; the hard needle core seat is connected with the other end of the first fixed needle core body and is matched with the needle tube seat; the range of an angle formed by the linear section needle tube and the bent section needle tube is 120-170 degrees; when the deformable needle core body is inserted into the bent section needle tube, the deformable needle core body can be bent. After the puncture needle is punctured into human tissues, the puncture direction can still be adjusted, the puncture direction can be adjusted by rotating the puncture needle tube and the bending section needle tube, the puncture needle is ensured to be in a safe position, and complications are avoided.

Description

Technical Field

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

[0002] Lumbar disc herniation is a common disease, and intervertebral disc puncture is a commonly used clinical diagnostic and treatment procedure. It can be used to diagnose the cause of low back and leg pain, clarify the shape, location, and size of the herniated disc, and can also be used for spinal angiography, radiofrequency ablation, and drug injection therapy.

[0003] Authorization Announcement No.: CN 211381646 U, Application Date: 2019.07.09, Utility Model Name: A Low-Invasive Lumbar Puncture Needle. This application relates to the field of medical device technology, specifically, to a low-invasive lumbar puncture needle. The lumbar puncture needle of this application includes a puncture needle tube and a puncture needle core. The puncture needle tube includes a needle tube body and a needle tube seat, and the puncture needle core includes a needle core body and a needle core seat. The head of the needle core body is conical, and the head of the needle tube body is hollow frustum-shaped. When the puncture needle core is fully inserted into the puncture needle tube, the head of the needle core body is completely exposed outside the needle tube body. This low-invasive lumbar puncture needle of this application first sharply inserts and then bluntly expands the puncture tissue. This not only reduces the area of ​​the dura mater tear after the lumbar puncture needle is removed, but also maximizes the preservation of the dura mater tissue's own contractile properties, accelerating the tear closure process, and ultimately reducing lumbar puncture complications.

[0004] In the aforementioned existing technologies, both the puncture needle tube and the puncture needle core are straight structures with a single direction of insertion. Once inserted into the human body, it is difficult to adjust the direction of the needle. Moreover, it requires a high level of skill from the physician. Young physicians, due to their lack of proficiency, are prone to puncturing the dura mater and arachnoid mater, causing medication to be mistakenly released into the subarachnoid space. This can lead to complications such as the puncture failing to reach the target point, puncture of the dural sac, nerve root damage, and bleeding inside or outside the spinal canal. Utility Model Content

[0005] In view of the shortcomings of existing technologies, such as the needle tube and needle core being of a straight structure, the needle having a single direction, difficulty in adjusting the direction, and easy occurrence of complications, the purpose of this utility model is to provide a lumbar puncture needle.

[0006] The technical solution provided by this utility model is as follows:

[0007] A lumbar puncture needle, comprising:

[0008] The puncture needle tube includes a straight section of the needle tube and a bent section of the needle tube connected at an angle to one end of the straight section of the needle tube; it also includes a needle tube seat connected to the other end of the straight section of the needle tube, wherein the straight section of the needle tube, the bent section of the needle tube, and the needle tube seat are hollow for the needle core to pass through.

[0009] The rigid needle core includes a first fixed needle core body and a deformable needle core body connected to one end of the first fixed needle core body; it also includes a rigid needle core seat connected to the other end of the first fixed needle core body, the rigid needle core seat being adapted to a needle tube seat;

[0010] The angle formed by the straight section of the needle tube and the bent section of the needle tube is in the range of 120° to 170°.

[0011] The outer wall of the first fixed needle core is in close contact with the inner wall of the straight section of the needle tube;

[0012] When the deformable needle core is inserted into the bent section of the needle tube, the deformable needle core can be bent.

[0013] Furthermore, the total length of the straight section needle tube and the bent section needle tube is the same as the total length of the first fixed needle core and the deformable needle core.

[0014] Furthermore, the length of the deformable needle core is approximately twice the length of the bent section of the needle tube; when the rigid needle core seat is fixed on the needle tube seat, the bending point of the deformable needle core is approximately located at its midpoint.

[0015] Furthermore, the deformable needle core includes a deformable portion and a filling portion connected to the deformable portion;

[0016] The first fixed needle core is connected to the filling part through a deformable part;

[0017] There is a gap between the deformable part and the straight section of the needle tube and the bent section of the needle tube;

[0018] The outer wall of the filling section is in close contact with the inner wall of the bent section of the needle.

[0019] Furthermore, the thickness of the deformable part does not exceed 2mm, and it can only be bent in one direction.

[0020] Furthermore, the end of the bent section needle tube away from the straight section needle tube is inclined, and the inclination angle of the section relative to the central axis of the bent section needle tube is not less than 30°.

[0021] Furthermore, the end of the filling section is inclined in the same direction as the end of the bent needle tube, and the inclination angle is the same.

[0022] Furthermore, it also includes a universal needle core, which includes a second fixed needle core body and a soft needle core body connected to one end of the second fixed needle core body;

[0023] The other end of the second fixed needle core is connected to the universal needle core seat, which is adapted to the needle tube seat.

[0024] Furthermore, the second fixed needle core has the same diameter as the soft needle core, and the soft needle core can be bent in any direction.

[0025] Furthermore, the length of the soft needle core is approximately three times the length of the bent section of the needle tube; when the universal needle core seat is fixed on the needle tube seat, the soft needle core extends out of the bent section of the needle tube.

[0026] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0027] The puncture needle of this invention includes a straight section and a bent section at a certain angle. After being inserted into human tissue, there is still an opportunity to adjust the direction of insertion. By simply rotating the puncture needle, the bent section can be adjusted to avoid bony tissue, prevent epidural injury and accidental entry into the subarachnoid space, ensure that the puncture needle is in a safe position, and avoid the occurrence of complications.

[0028] This invention also includes a universal needle that extends through the needle tube. When puncturing the bone of the lumbar facet joint, the universal needle is replaced. The universal needle first performs blunt separation of the interstitial space, which facilitates the follow-up insertion of the puncture needle tube. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the puncture needle in one embodiment of this application;

[0030] Figure 2 This is a partially enlarged schematic diagram of the puncture needle in one embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the overall structure of the hard needle core in one embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the overall structure of the hard needle core from a second angle in one embodiment of this application;

[0033] Figure 5 This is a partially enlarged structural diagram of the hard needle core in one embodiment of this application;

[0034] Figure 6 This is a partially enlarged structural diagram of the hard needle core at a second angle in one embodiment of this application;

[0035] Figure 7 This is a schematic diagram of the overall structure of a rigid needle core after it has been inserted into a puncture needle tube in one embodiment of this application;

[0036] Figure 8 This is a schematic diagram of the overall structure of the universal needle core in one embodiment of this application;

[0037] Figure 9 This is a partially enlarged schematic diagram of the universal needle core structure in one embodiment of this application;

[0038] Figure 10 This is a schematic diagram of the overall structure after the universal needle core is inserted into the puncture needle tube in one embodiment of this application;

[0039] Figure 11 This is a schematic diagram of the overall structure after the universal needle core is inserted into the puncture needle tube at the second angle in one embodiment of this application;

[0040] Explanation of the labels in the diagram:

[0041] 11. Straight section of needle tube; 12. Bent section of needle tube; 13. Needle tube seat;

[0042] First fixed needle core 21, deformable needle core 22, hard needle core seat 23, deformable part 221, filling part 222;

[0043] Second fixed needle core 31, soft needle core 32, universal needle core seat 33. Detailed Implementation

[0044] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0045] The structures, proportions, and sizes illustrated in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0046] Lumbar puncture is a commonly used clinical diagnostic and treatment procedure. It can be used to diagnose various inflammatory diseases of the central nervous system, vascular diseases, spinal cord lesions, suspected intracranial space-occupying lesions, neurological diseases of unknown diagnosis, pneumocephalus, and myelography; it is also used for draining (decompressing) cerebrospinal fluid due to excessive pressure and for injecting drugs to treat central nervous system diseases.

[0047] Currently, the needles and cores used for lumbar punctures are all straight, resulting in a single direction of needle insertion. Once inserted into the body, it is difficult to adjust the direction of the needle. Moreover, it requires a high level of skill from the physician. Young physicians, due to their lack of proficiency, are prone to puncturing the dura mater and arachnoid mater, causing medication to be accidentally released into the subarachnoid space, leading to complications for the patient.

[0048] The lumbar puncture needle of this application overcomes the above-mentioned shortcomings through a special structure. After puncture, the direction can be adjusted to avoid bony tissue, avoid epidural injury and accidental entry into the subarachnoid space, ensure that the puncture needle is in a safe position, and avoid the occurrence of complications.

[0049] This application discloses a lumbar puncture needle, comprising a puncture needle tube and two types of needle cores: a rigid needle core and a universal needle core. The rigid needle core is used for initial puncture. When the puncture reaches the bone of the lumbar facet joint, the universal needle core is replaced to continue the puncture.

[0050] The puncture needle includes a straight section 11 and a bent section 12, which are connected at an angle. The angle formed between one end of the straight section 11 and the bent section 12 ranges from 120° to 170°. The puncture needle also includes a needle holder 13 connected to the other end of the straight section 11. The straight section 11, the bent section 12, and the needle holder 13 are hollow for the needle core to pass through.

[0051] The purpose of setting the bent section of the needle tube 12 is to allow for the adjustment of the needle insertion direction after the puncture needle has penetrated human tissue. The puncture direction can be adjusted simply by rotating the puncture needle tube. The length of the bent section of the needle tube 12 is preferably 1 cm.

[0052] The rigid needle core includes a first fixed needle core body 21, a deformable needle core body 22 connected to one end of the first fixed needle core body, and a rigid needle core seat 23 connected to the other end of the first fixed needle core body 21. The rigid needle core seat 23 is adapted to the needle tube seat 13. When the deformable needle core body is inserted into the bent section of the needle tube 12, the deformable needle core body 22 can be bent.

[0053] Specifically, the total length of the straight section of the needle tube 11 and the bent section of the needle tube 12 is the same as the total length of the first fixed needle core 21 and the deformable needle core 22. This means that the rigid needle core will not protrude from the puncture needle tube, preventing the hard needle core from puncturing important human tissues. In addition, the outer wall of the first fixed needle core 21 is tightly fitted to the inner wall of the puncture needle tube, which not only prevents human tissue from entering the needle tube, but also prevents the needle core from shaking.

[0054] The most distinctive feature of the rigid needle core is the deformable needle core 22, which has a lower hardness than the first fixed needle core 21. Therefore, when the deformable needle core 22 enters the bending section of the needle tube 12, it can be bent. The length of the deformable needle core 22 is approximately twice the length of the bending section of the needle tube 12. When the rigid needle core seat 23 is fixed on the needle tube seat 13, the bending point of the deformable needle core 22 is approximately located at its midpoint. The advantage of taking the midpoint as the bending point is that it can make the deformable needle core 22 bear force evenly.

[0055] If the length of the deformable needle core 22 is the same as the length of the bent section needle tube 12, then the bending point of the deformable needle core 22 will be located at the connection point between the first fixed needle core 21 and the deformable needle core 22. The connection point itself is a weak point under stress. If it is bent again, it is very easy to break, increasing the risk of puncture.

[0056] More specifically, the deformable needle core 22 includes a deformable portion 221 and a portion connected to the deformable portion 221. Therefore, one end of the deformable portion 221 is fixedly connected to the first fixed needle core 21, and the other end is fixedly connected to the filling portion 222. The filling portion 222 is the end of the rigid needle core, meaning it is the end that first contacts the human tissue. The outer wall of the filling portion 222 fits tightly against the inner wall of the bent section of the needle tube 12 to prevent human tissue from entering the needle tube.

[0057] There is a gap between the deformable part 221 and the straight section needle tube 11 and the bent section needle tube 12. In other words, the thickness of the deformable part 221 is smaller than that of the rest of the rigid needle core, and therefore its hardness is also smaller, making it easier to bend. In addition, in order to ensure the overall strength of the rigid needle core, the first fixed needle core body 21 and the deformable needle core body 22 are integrally formed.

[0058] More specifically, the thickness of the deformable part 221 is no more than 2 mm, and it can only be bent in one direction.

[0059] In order to make the puncture needle tube and hard needle core easier to penetrate human tissue, and to reduce the resistance encountered during puncture, the end section of the bent section needle tube 12 is inclined, and the inclination angle of the section relative to the central axis of the bent section needle tube 12 is not less than 30°. The end of the filling part 222 is inclined in the same direction as the end of the bent section needle tube 12, and the inclination angle is the same, similar to both being cut off at the same time.

[0060] Another type of needle core is a universal needle core, which includes a second fixed needle core body 31. The two ends of the second fixed needle core body 31 are respectively connected to a soft needle core body 32 and a universal needle core seat 33. The universal needle core seat 33 is adapted to the needle tube seat 13.

[0061] The second fixed needle core 31 and the soft needle core 32 have the same diameter, but the soft needle core 32 can be bent at any angle and in any direction. The second fixed needle core 31 and the soft needle core 32 are also integrally formed. The length of the soft needle core 32 is preferably three times the length of the bent section of the needle tube. When the universal needle core seat 33 is fixed on the needle tube seat 13, the bending point of the soft needle core 32 is approximately located at 1 / 3 of its length.

[0062] The soft needle core 32 protrudes through the bent section of the needle tube 12, and the protrusion length is not less than 1cm. The purpose of the soft needle core 32 protruding is mainly to perform blunt separation of the tissue space first, so as to facilitate the follow-up insertion of the puncture needle tube.

[0063] The outer walls of the second fixed needle core 31 and the soft needle core 32 are tightly fitted to the inner walls of the straight section of the needle tube 11 and the bent section of the needle tube 12, also to prevent human tissue from entering the puncture needle tube. When further puncture into important human tissue spaces is required, the rigid needle core can be pulled out and replaced with a universal needle core. When the final target point is reached, the universal needle core is pulled out, and the needle tube seat 13 can be tightly connected to a conventional syringe, facilitating the injection of liquid drugs.

[0064] The specific operation method of the lumbar puncture needle disclosed in this application is as follows:

[0065] First, the patient is placed in a supine position with a fixed pillow under the chest and hips to increase lumbar kyphosis and widen the intervertebral space. The puncture point, puncture angle and target point are marked under CT scan. Then, local disinfection and anesthesia are performed.

[0066] The surgeon selects a puncture needle with a rigid core and performs a puncture in the L4-L5 intervertebral disc space, typically inserting it about 10cm to reach the facet joint bone. After confirmation by CT scan, the first puncture target point of the facet joint is reached. After replacing the universal puncture core, the puncture needle is advanced step by step by rotating it, 1-2cm, followed by successive CT scans to confirm that the end of the universal puncture core has reached the final target point, the anterior dural sac space.

[0067] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A lumbar puncture needle, characterized in that: include, The puncture needle tube includes a straight section needle tube (11) and a bent section needle tube (12) connected at an angle to one end of the straight section needle tube (11); it also includes a needle tube seat (13) connected to the other end of the straight section needle tube (11). The straight section needle tube (11), the bent section needle tube (12) and the needle tube seat (13) are hollow and used for the needle core to pass through. The rigid needle core includes a first fixed needle core body (21) and a deformable needle core body (22) connected to one end of the first fixed needle core body (21); it also includes a rigid needle core seat (23) connected to the other end of the first fixed needle core body (21), the rigid needle core seat (23) being adapted to the needle tube seat (13); The angle formed by the straight section needle tube (11) and the bent section needle tube (12) ranges from 120° to 170°. The outer wall of the first fixed needle core (21) is in close contact with the inner wall of the straight section needle tube (11); When the deformable needle core (22) is inserted into the bent section needle tube (12), the deformable needle core (22) can be bent.

2. The lumbar puncture needle according to claim 1, characterized in that: The total length of the straight section needle tube (11) and the bent section needle tube (12) is the same as the total length of the first fixed needle core (21) and the deformable needle core (22).

3. A lumbar puncture needle according to claim 2, characterized in that: The length of the deformable needle core (22) is approximately twice the length of the bent section of the needle tube (12); when the rigid needle core seat (23) is fixed on the needle tube seat (13), the bending point of the deformable needle core (22) is approximately located at its midpoint.

4. A lumbar puncture needle according to claim 3, characterized in that: The deformable needle core (22) includes a deformable part (221) and a filling part (222) connected to the deformable part (221); The first fixed needle core (21) and the filling part (222) are connected by the deformable part (221); There is a gap between the deformable part (221) and the straight section needle tube (11) and the bent section needle tube (12); The outer wall of the filling part (222) is closely fitted with the inner wall of the bent section needle tube (12).

5. A lumbar puncture needle according to claim 4, characterized in that: The thickness of the deformable part (221) is no more than 2 mm, and it can only be bent in one direction.

6. A lumbar puncture needle according to claim 4, characterized in that: The end of the bent section needle tube (12) away from the straight section needle tube (11) is inclined, and the inclination angle of the section relative to the central axis of the bent section needle tube (12) is not less than 30°.

7. A lumbar puncture needle according to claim 6, characterized in that: The end of the filling part (222) is inclined in the same direction as the end of the bent section needle tube (12), and the inclination angle is the same.

8. A lumbar puncture needle according to claim 1, characterized in that: It also includes a universal needle core, which includes a second fixed needle core body (31) and a soft needle core body (32) connected to one end of the second fixed needle core body (31); The other end of the second fixed needle core (31) is connected to the universal needle core seat (33), which is adapted to the needle tube seat (13).

9. A lumbar puncture needle according to claim 8, characterized in that: The second fixed needle core (31) has the same diameter as the soft needle core (32), and the soft needle core (32) can be bent in any direction.

10. A lumbar puncture needle according to claim 9, characterized in that: The length of the soft needle core (32) is approximately three times the length of the bent section needle tube (12); when the universal needle core seat (33) is fixed on the needle tube seat (13), the soft needle core (32) extends out of the bent section needle tube (12).

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