Lumbar puncture needle for intrathecal injection

Abstract

The utility model relates to a lumbar puncture needle for intrathecal injection, including needle seat, needle body, inner tube and moving column, the rear end surface recess of needle seat forms with circular groove, the front end of needle body is equipped with needle tip, the rear end of needle body is fixedly connected needle seat, be equipped with passageway in the needle body, the rear end of passageway is communicated circular groove, and the front end is communicated one side of needle body front end after lateral bending, the inner tube is slidably matched in passageway, the front part of inner tube can take place elastic bending deformation, the moving column is fixed in the rear end of inner tube, the rear end surface recess of moving column forms with the installation groove that cooperates with syringe teat, the installation groove is communicated inner tube. Since the above technical scheme is used, when the lumbar puncture needle for intrathecal injection is used to carry out intrathecal injection, the position of liquid medicine entering to the subarachnoid cavity can be closer to the ventricle of patient's brain, and the time of drug diffusion to the ventricle of patient's brain can be shortened.

Description

Technical Field

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

[0002] Intrathecal injection involves injecting the drug directly into the subarachnoid space via lumbar puncture, allowing the drug to diffuse into the ventricles through the cerebrospinal fluid. Intrathecal injection is a preferred route of drug administration and a method for treating intracranial infections.

[0003] Intrathecal injection requires a lumbar puncture. The puncture site is typically chosen between the 3rd and 4th or 4th and 5th lumbar vertebrae. This location minimizes the risk of spinal cord injury, and the long cauda equina nerve roots, which move within the cerebrospinal fluid, are also less susceptible to injury. The 3rd and 4th or 4th and 5th lumbar vertebrae are considered safe sites for lumbar puncture. During the procedure, the needle is slowly inserted along the spinous process from the puncture site. When the needle has penetrated approximately 4-6 cm, it penetrates the dura mater and reaches the subarachnoid space, completing the lumbar puncture. The therapeutic medication can then be injected into the subarachnoid space using a syringe through the needle.

[0004] Currently, the lumbar puncture needles used for intrathecal injections are ordinary lumbar puncture needles. When using existing lumbar puncture needles for intrathecal injections, the drug can only be expelled from the end of the needle located in the subarachnoid space. The distance between the injection site and the patient's ventricle is relatively far, and the drug needs a long time to diffuse into the patient's ventricle. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide a lumbar puncture needle for intrathecal injection, so as to solve the technical problem that when using existing lumbar puncture needles for intrathecal injection, the drug needs a long time to diffuse into the patient's ventricles.

[0006] This utility model is achieved through the following technical solution:

[0007] A lumbar puncture needle for intrathecal injection includes a needle hub, a needle body, an inner tube, and a movable post. The rear end face of the needle hub is recessed to form a circular groove. The front end of the needle body is provided with a needle tip. The rear end of the needle body is fixedly connected to the needle hub. The needle body has a channel. The rear end of the channel is connected to the circular groove, and the front end, after being laterally bent, is connected to one side of the front end of the needle body. The inner tube is slidably fitted within the channel. The front part of the inner tube can undergo elastic bending deformation. The movable post is fixed to the rear end of the inner tube. The rear end face of the movable post is recessed to form a mounting groove that mates with the syringe nipple. The mounting groove is connected to the inner tube.

[0008] Furthermore, a rubber plug is fixed to the front end of the circular groove, and a through hole is formed on the rubber plug to communicate with the channel. The rear part of the inner tube is located in the through hole, and the inner tube is interference-fitted with the through hole.

[0009] Furthermore, the front part of the movable column is located inside the rear part of the circular groove; it also includes a locking part for locking the front part of the movable column to the rear part of the circular groove.

[0010] Furthermore, the movable column mates with the circular groove; the outer surface of the rear part of the needle holder is recessed inward to form an insertion hole, the insertion hole being perpendicular to the length direction of the needle body; the outer surface of the front part of the movable column is formed with a first slot corresponding to the position of the insertion hole; the locking part includes a plug and adhesive tape, one end of the plug is inserted into the first slot through the insertion hole, the adhesive tape is fixed to the other end of the plug, and the adhesive tape is adhered to the outer surface of the needle holder.

[0011] Furthermore, the locking part also includes a plastic sheet, which is fixed to one end of the adhesive tape.

[0012] Furthermore, the channel includes a first straight section, a second straight section, and an arc-shaped section. The first straight section is arranged along the length direction of the needle body, and the rear end of the first straight section is connected to the circular groove. The second straight section is arranged perpendicular to the first straight section, and one end of the second straight section is connected to one side of the front end of the needle body. One end of the arc-shaped section is directly connected to the front end of the first straight section, and the other end is directly connected to the other end of the second straight section.

[0013] A second slot is recessed on the side wall of the arc-shaped segment. The diameter of the second slot is smaller than the diameter of the first straight segment. The second slot is coaxial with the first straight segment.

[0014] It also includes a handle and a core rod. The front end of the handle is located in the mounting groove, the rear end of the handle is located behind the moving column, the core rod is located in the inner tube and cooperates with the inner cavity of the inner tube, the rear end of the core rod is fixedly connected to the handle, and the front end of the core rod is inserted into the second slot.

[0015] Furthermore, the handle is detachably and fixedly connected to the movable column.

[0016] Furthermore, the mounting groove includes a threaded groove recessed forward from the rear end face of the movable column and a fixing groove recessed forward from the bottom wall of the threaded groove, the fixing groove cooperating with the nipple of the syringe.

[0017] The handle includes a cylinder with an external thread at its front, which is screwed into the threaded groove.

[0018] Furthermore, the outer surface of the needle holder has a protruding rib extending outward, the length direction of the rib is set along the front-back direction, and the protruding direction of the rib is the same as the orientation of the front end of the channel.

[0019] Furthermore, the outer surface of the needle is provided with multiple length scale lines, which are arranged evenly at intervals from front to back.

[0020] The beneficial effects of this utility model are as follows:

[0021] When using the lumbar puncture needle for intrathecal injection as described in this invention, the medication can be delivered to the subarachnoid space closer to the patient's ventricle, thus shortening the time it takes for the medication to diffuse into the patient's ventricle.

[0022] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the lumbar puncture needle for intrathecal injection according to the present invention;

[0024] Figure 2 This is a rear view of the lumbar puncture needle for intrathecal injection according to this utility model;

[0025] Figure 3 for Figure 2 AA section view;

[0026] Figure 4 for Figure 3 Enlarged view of 'a' in the middle;

[0027] Figure 5 for Figure 3 Enlarged view of b in the middle;

[0028] Figure 6 for Figure 3 A magnified view of C in the middle.

[0029] In the diagram: Needle base - 1; Needle body - 2; Moving column - 3; Circular groove - 4; Needle tip - 5; Channel - 6; First tube section - 7; Second tube section - 8; Rubber plug - 9; Through hole - 10; Insertion hole - 11; First slot - 12; Insert block - 13; Adhesive tape - 14; Plastic sheet - 15; First straight section - 16; Second straight section - 17; Arc section - 18; Second slot - 19; Handle - 20; Core rod - 21; Threaded groove - 22; Fixing groove - 23; Raised strip - 24. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] In the above description of this utility model, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0035] Please see Figure 1-6This utility model provides a technical solution: a lumbar puncture needle for intrathecal injection, comprising a needle base 1, a needle body 2, an inner tube, and a movable column 3. The rear end face of the needle base 1 is recessed to form a circular groove 4. The front end of the needle body 2 is provided with a needle tip 5. The rear end of the needle body 2 is fixedly connected to the needle base 1. The needle body 2 is provided with a channel 6. The rear end of the channel 6 is connected to the circular groove 4, and the front end is laterally bent to connect to one side of the front end of the needle body 2. The inner tube is slidably fitted in the channel 6. The front part of the inner tube can undergo elastic bending deformation. The movable column 3 is fixed to the rear end of the inner tube. The rear end face of the movable column 3 is recessed to form an installation groove that mates with the syringe nipple. The installation groove is connected to the inner tube.

[0036] When performing a lumbar puncture on a patient using the lumbar puncture needle for intrathecal injection described in this invention, hold the needle hub 1 and the movable column 3 by hand to keep their relative positions unchanged, ensuring the opening of the channel 6 faces the patient's head. Select the 3rd-4th or 4th-5th lumbar intervertebral space as the puncture point, and slowly insert the needle body 2 from the puncture point along the spinous process direction. When cerebrospinal fluid is observed flowing out at the mounting groove, it indicates that the front end of the channel 6 has reached the subarachnoid space. At this point, insert and fix the nipple of the syringe containing the medication into the mounting groove. Then, stabilize the needle hub 1 by hand and move the syringe forward. The syringe pushes the movable column 3 forward within the circular groove 4, and the movable column 3 pushes the inner tube forward. During the forward movement of the inner tube, the front end of the inner tube can elastically bend at the bending position of the channel 6 and pass through the channel opening to the outside of the needle body 2. Because the opening of the channel 6 faces the patient's head during the insertion of the needle 2 into the subarachnoid space, after the inner tube moves forward a certain distance, the front end of the inner tube can move to the side of the channel opening closer to the patient's head, and can be separated from the channel opening by a certain distance. Then, the medication can be injected through the syringe. The medication in the syringe can flow through the inner tube and be discharged from the front end of the inner tube. When using the lumbar puncture needle for intrathecal injection of this invention for intrathecal injection, the medication can enter the subarachnoid space closer to the patient's ventricles, which can shorten the time for the drug to diffuse into the patient's ventricles.

[0037] In this embodiment, the inner tube includes a first tube segment 7 and a second tube segment 8. The first tube segment 7 is slidably fitted within the channel 6. The rear end of the first tube segment 7 is fixedly connected to the movable column 3 and communicates with the mounting groove. The first tube segment 7 is made of stainless steel. The rear end of the second tube segment 8 is directly opposite and fixedly connected to the first tube segment 7. The second tube segment 8 is slidably fitted within the channel 6 and is made of rubber. With this structure, the inner tube can slidably fit within the channel 6, and the front part of the inner tube can undergo elastic bending deformation.

[0038] In this embodiment, a rubber plug 9 is fixedly provided at the front end of the circular groove 4, and a through hole 10 is formed on the rubber plug 9 to communicate with the channel 6. The rear part of the inner tube is located in the through hole 10, and the inner tube is interference-fitted with the through hole 10. Specifically, the first tube segment 7 is interference-fitted with the through hole 10.

[0039] Because the inner tube is press-fitted with the through hole 10 on the rubber stopper 9, liquid does not easily pass between the inner tube and the wall of the through hole 10. During the injection of medicine using a syringe, the possibility of liquid in the subarachnoid space being discharged through the channel 6 can be reduced.

[0040] In this embodiment, the front part of the movable column 3 is located inside the rear part of the circular groove 4; the lumbar puncture needle for intrathecal injection of this utility model also includes a locking part for locking the front part of the movable column 3 to the rear part of the circular groove 4.

[0041] During the insertion of the needle 2 into the subarachnoid space, the locking part locks the front part of the movable column 3 within the rear part of the circular groove 4, preventing the movable column 3 from moving relative to the needle seat 1 and making it easier to maintain the relative position of the needle seat 1 and the movable column 3. This also prevents the inner tube from accidentally dislodging from the channel 6 during the insertion of the needle 2 into the subarachnoid space. Before pushing the movable column 3 forward within the circular groove 4, the locking part can be released from its lock.

[0042] In this embodiment, the movable column 3 cooperates with the circular groove 4; the outer surface of the rear part of the needle holder 1 is recessed inward to form an insertion hole 11, the insertion hole 11 is arranged perpendicular to the length direction of the needle body 2, and the outer surface of the front part of the movable column 3 is formed with a first slot 12 corresponding to the position of the insertion hole 11; the locking part includes a plug 13 and an adhesive tape 14, one end of the plug 13 is inserted into the first slot 12 through the insertion hole 11, the adhesive tape 14 is fixed to the other end of the plug 13, and the adhesive tape 14 is pasted on the outer surface of the needle holder 1.

[0043] The movable column 3 cooperates with the circular groove 4. Specifically, there is still a certain gap between the movable column 3 and the side wall of the circular groove 4. During the process of the movable column 3 moving forward in the circular groove 4, the air in the circular groove 4 can be discharged through the gap between the movable column 3 and the side wall of the circular groove 4.

[0044] When the locking part locks the front part of the movable column 3 into the rear part of the circular groove 4, one end of the insert block 13 is inserted into the first slot 12, a part of the insert block 13 is located in the insertion hole 11, and the adhesive tape 14 sticks and fixes the insert block 13 to the needle seat 1.

[0045] Peel off the adhesive tape 14 from the needle holder 1 and pull out the insert 13 from the slot and the insertion hole 11. At this time, the locking part can be released from the locking of the moving column 3, and the moving column 3 can move forward in the circular groove 4.

[0046] In this embodiment, the locking part further includes a plastic sheet 15, which is fixed to one end of the adhesive tape 14. When the adhesive tape 14 is attached to the needle holder 1, the plastic sheet 15 will not stick to the needle holder 1. By pinching the plastic sheet 15 and moving it away from the needle holder 1, a portion of the adhesive tape 14 can be torn off the needle holder 1, making it more convenient to tear the adhesive tape 14 off the needle holder 1.

[0047] In this embodiment, the channel 6 includes a first straight section 16, a second straight section 17, and an arc-shaped section 18. The first straight section 16 is arranged along the length direction of the needle body 2, and the rear end of the first straight section 16 is connected to the circular groove 4. The second straight section 17 is arranged perpendicular to the first straight section 16, and one end of the second straight section 17 is connected to one side of the front end of the needle body 2. One end of the arc-shaped section 18 is directly connected to the front end of the first straight section 16, and the other end is directly connected to the other end of the second straight section 17.

[0048] A second slot 19 is recessed on the side wall of the arc-shaped segment 18. The diameter of the second slot 19 is smaller than the diameter of the first straight segment 16. The second slot 19 and the first straight segment 16 are arranged coaxially.

[0049] The lumbar puncture needle for intrathecal injection of this utility model also includes a handle 20 and a core rod 21. The front end of the handle 20 is located in the mounting groove, the rear end of the handle 20 is located behind the moving column 3, the core rod 21 is located in the inner tube and cooperates with the inner cavity of the inner tube, the rear end of the core rod 21 is fixedly connected to the handle 20, and the front end of the core rod 21 is inserted into the second slot 19.

[0050] By setting the core rod 21, the core rod 21 can support the needle body 2, and reduce the possibility of the needle body 2 bending during the process of inserting the needle body 2 into the subarachnoid space.

[0051] During the insertion of the needle body 2 into the subarachnoid space, when the doctor feels a breakthrough sensation as the dura mater is pierced, it indicates that the tip of the needle body 2 has reached the subarachnoid space. Then, the doctor pinches and moves the handle 20 backward to pull the core rod 21 out of the inner tube. The needle body 2 is then moved a short distance into the subarachnoid space. When cerebrospinal fluid is found flowing out at the mounting groove, the nipple of the syringe containing the medication can be inserted and fixed in the mounting groove.

[0052] In this embodiment, the handle 20 is detachably fixed to the movable column 3. Before the core rod 21 is pulled out backward from the inner tube, the handle 20 can be fixed to the movable column 3, and the core rod 21 cannot move back and forth in the inner tube. During the process of inserting the needle body 2 into the subarachnoid space, the core rod 21 can be prevented from accidentally coming out backward from the inner tube.

[0053] When it is necessary to pull the core rod 21 out of the inner tube, the handle 20 is removed from the moving column 3, and then the handle 20 can be moved backward to pull the core rod 21 out of the inner tube.

[0054] In this embodiment, the mounting groove includes a threaded groove 22 formed by recessing forward from the rear end face of the movable column 3 and a fixing groove 23 formed by recessing forward from the bottom wall of the threaded groove 22. The fixing groove 23 cooperates with the nipple of the syringe.

[0055] The handle 20 includes a cylinder with an external thread at the front, which is screwed into the threaded groove 22.

[0056] When the front part of the cylinder is screwed into the threaded groove 22, the cylinder can be fixedly connected to the movable column 3, and the handle 20 can be fixedly connected to the movable column 3. By rotating the cylinder in the threaded groove 22, the cylinder can be unscrewed from the threaded groove 22, and at this time, the cylinder can be removed from the movable column 3, that is, the handle 20 can be removed from the movable column 3.

[0057] In this embodiment, a protruding rib 24 is formed on the outer surface of the needle holder 1. The length direction of the protruding rib 24 is arranged along the front-rear direction, and the protruding direction of the protruding rib 24 is the same as the orientation of the front end of the channel 6. That is, the orientation of the side of the protruding rib 24 on the needle holder 1 is the same as the orientation of the front end of the channel 6.

[0058] During the insertion of the needle body 2 into the subarachnoid space, the orientation of the front opening of the channel 6 can be determined by observing the protrusion direction of the convex strip 24. After the front opening of the channel 6 enters the subarachnoid space, it is convenient to determine whether the front opening of the channel 6 is still facing the patient's head by observing the protrusion direction of the convex strip 24. If the orientation of the front opening of the channel 6 has shifted, the needle body 2 can be rotated, and the protrusion direction of the convex strip 24 can be referenced to rotate the front opening of the channel 6 back to face the patient's head.

[0059] In this embodiment, the outer surface of the needle body 2 is provided with multiple length scale lines (not shown in the figure), which are evenly spaced from front to back. This allows for easy observation of the insertion depth of the needle body 2 into the human body by referring to the length scale lines during the insertion of the needle body 2 into the subarachnoid space.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A lumbar puncture needle for intrathecal injection, characterized in that: The device includes a needle hub, a needle body, an inner tube, and a movable column. The rear end face of the needle hub is recessed to form a circular groove. The front end of the needle body is provided with a needle tip. The rear end of the needle body is fixed to the needle hub. The needle body has a channel. The rear end of the channel is connected to the circular groove, and the front end is laterally bent to connect to one side of the front end of the needle body. The inner tube is slidably fitted within the channel. The front part of the inner tube can undergo elastic bending deformation. The movable column is fixed to the rear end of the inner tube. The rear end face of the movable column is recessed to form a mounting groove that mates with the syringe nipple. The mounting groove is connected to the inner tube.

2. The spinal needle for intrathecal injection of claim 1, wherein: A rubber plug is fixed to the front end of the circular groove, and a through hole is formed on the rubber plug to connect the channel. The rear part of the inner tube is located in the through hole, and the inner tube is interference-fitted with the through hole.

3. The spinal needle for intrathecal injection of claim 1, wherein: The front part of the movable column is located inside the rear part of the circular groove; it also includes a locking part for locking the front part of the movable column to the rear part of the circular groove.

4. The spinal needle for intrathecal injection of claim 3, wherein: The movable column mates with the circular groove; the outer surface of the rear part of the needle holder is recessed inward to form an insertion hole, which is perpendicular to the length direction of the needle body; the outer surface of the front part of the movable column is formed with a first slot corresponding to the position of the insertion hole; the locking part includes a plug and adhesive tape, one end of the plug is inserted into the first slot through the insertion hole, the adhesive tape is fixed to the other end of the plug, and the adhesive tape is attached to the outer surface of the needle holder.

5. The spinal needle for intrathecal injection of claim 4, wherein: The locking part also includes a plastic sheet, which is fixed to one end of the adhesive tape.

6. The lumbar puncture needle for intrathecal injection according to claim 1, characterized in that: The channel includes a first straight section, a second straight section, and an arc-shaped section. The first straight section is arranged along the length of the needle body, and the rear end of the first straight section is connected to the circular groove. The second straight section is arranged perpendicular to the first straight section, and one end of the second straight section is connected to one side of the front end of the needle body. One end of the arc-shaped section is directly connected to the front end of the first straight section, and the other end is directly connected to the other end of the second straight section. A second slot is recessed on the side wall of the arc-shaped segment. The diameter of the second slot is smaller than the diameter of the first straight segment. The second slot is coaxial with the first straight segment. It also includes a handle and a core rod. The front end of the handle is located in the mounting groove, the rear end of the handle is located behind the moving column, the core rod is located in the inner tube and cooperates with the inner cavity of the inner tube, the rear end of the core rod is fixedly connected to the handle, and the front end of the core rod is inserted into the second slot.

7. The lumbar puncture needle for intrathecal injection according to claim 6, characterized in that: The handle is detachably and fixedly connected to the movable column.

8. The lumbar puncture needle for intrathecal injection according to claim 7, characterized in that: The mounting groove includes a threaded groove recessed forward from the rear end of the movable column and a fixing groove recessed forward from the bottom wall of the threaded groove, the fixing groove cooperating with the nipple of the syringe. The handle includes a cylinder with an external thread at its front, which is screwed into the threaded groove.

9. The lumbar puncture needle for intrathecal injection according to claim 1, characterized in that: The outer surface of the needle holder has a protruding rib extending outward, the length of the rib is arranged along the front-to-back direction, and the protruding direction of the rib is the same as the orientation of the front end of the channel.

10. The lumbar puncture needle for intrathecal injection according to claim 1, characterized in that: The outer surface of the needle is provided with multiple length scale lines, which are arranged evenly at intervals from front to back.

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