Lumbar puncture needle

Abstract

The utility model discloses a lumbar puncture needle which comprises a needle tube and a needle core, the needle core is inserted from the tail portion of the needle tube and used for blocking the needle tube, a holding handle is arranged at the tail end of the needle core, and a pressure relief groove extending to the front end is formed in the needle core. The high-pressure puncture needle has the advantages that whether a high-pressure condition exists at a puncture part or not can be observed by tentatively pulling out the needle core, and the needle core can be quickly pushed back when an emergency occurs, so that the high-speed liquid spraying condition at the puncture part is avoided.

Description

Technical Field

[0001] The utility model relates to the field of medical instruments, in particular to a lumbar puncture needle. Background Art

[0002] The lumbar puncture needle is a conventional medical device used for patient puncture. It is generally composed of a needle tube and a needle core. The needle core is inserted into the needle tube from the rear end of the needle tube and is used to block the needle tube during puncture. When the puncture is in place, the needle core generally needs to be removed. The needle tube forms a channel connecting the lesion and the outside world.

[0003] For example, a public document with publication number CN218128688U, publication date 2022-12-27, and patent name "A Lumbar Puncture Needle" discloses a lumbar puncture needle, including a syringe and a needle core, the syringe having a horizontal through hole, the needle core extending into the horizontal through hole and adapted therewith, the outer wall of the rear end of the syringe having a circle of syringe hand-held end, and the rear end of the needle core having a circle of needle core hand-held end, when the front end of the needle core corresponds to the front end of the syringe, the distance between the needle core hand-held end and the syringe hand-held end is 1cm to 3cm, a spiral groove is provided along the outer wall of the syringe, the spiral groove is filled with a scale bar, and scales are set on the scale bar.

[0004] When a similar traditional lumbar puncture needle is used, if the patient's intracranial pressure increases, then when the needle core is pulled out during the lumbar puncture examination, high-speed liquid spray will occur due to excessive pressure in the body. If the needle core is then used to block the needle tube, it must be aligned and inserted. If the medical staff operates improperly and fails to quickly align and insert the needle core into the needle tube, the patient may face fatal risks such as brain herniation due to excessive cerebrospinal fluid pressure. Summary of the invention

[0005] The technical problem to be solved by the utility model is to realize a lumbar puncture needle which can release pressure slowly according to the need and avoid the situation that the needle core is pulled out and high-speed liquid spray occurs.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a lumbar puncture needle, comprising a needle tube and a needle core, the needle core is inserted from the tail end of the needle tube to block the needle tube, a gripping handle is provided at the tail end of the needle core, and a pressure relief groove extending to the front end is provided on the needle core.

[0007] The outer diameter of the needle core has an interference fit with the inner wall of the needle tube, the length of the needle core is the same as the length of the needle tube, and when the needle core is fully inserted into the needle tube, the end of the needle core is flush with the end of the needle tube, and the needle core and the front end of the needle tube are provided with a wedge structure with the same inclination angle.

[0008] The pressure relief groove is a strip-shaped groove structure extending deep into the axial direction of the needle core.

[0009] A marking line is arranged at the front of the needle core near the starting end of the pressure relief groove.

[0010] The front end of the needle core is a structure with a pressure relief hole at the center, and the pressure relief hole is connected to the pressure relief groove.

[0011] The front end of the needle tube is provided with a hole matching the shape of the pressure relief groove.

[0012] The length of the pressure relief groove accounts for 40%-75% of the length of the needle core.

[0013] The tail end of the needle core is provided with a protruding positioning protrusion, and the tail of the needle tube is provided with a limiting groove for the positioning protrusion to sink into.

[0014] The holding handle is made of magnetic material, and the tail of the needle tube is made of magnetic material or iron that is attracted to the holding handle.

[0015] The utility model has the advantages of being able to observe whether there is a high pressure situation at the puncture site by tentatively pulling out the needle core, and being able to quickly push back the needle core in case of an emergency to avoid the occurrence of high-speed liquid spraying at the puncture site. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The following is a brief description of the contents expressed in each figure in the utility model specification and the marks in the figure:

[0017] Figure 1 , 2 This is a schematic diagram of the structure of a lumbar puncture needle;

[0018] The markings in the above figures are: 1. needle tube; 2. needle core; 3. pressure relief groove; 4. pressure relief hole; 5. marking line; 6. hole. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the specific implementation methods of the present invention, such as the shapes and structures of the components involved, the relative positions and connection relationships between the components, the functions and working principles of the components, the manufacturing process and the operation and use methods, etc., through the description of the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0020] The overall structure of the lumbar puncture needle is as follows Figure 1As shown, it is composed of a needle tube 1 and a needle core 2. The needle core 2 and the needle tube 1 are used in combination. The needle core 2 is used to be inserted from the tail end of the needle tube 1 to block the needle tube 1. The length of the needle core 2 is the same as that of the needle tube 1, and the end has a wedge-shaped mechanism of the same shape, that is, a tip structure of the same shape, which is convenient for medical personnel to perform puncture. Because the tip is a wedge-shaped structure, in order to ensure that the needle tube 1 and the needle core 2 overlap each other at the front end, a protruding positioning protrusion is provided at the tail end of the needle core 2, and a limiting groove is provided at the tail end of the needle tube 1 for the positioning protrusion to sink into. When the needle core 2 is completely inserted into the needle tube 1, the positioning protrusion is just embedded in the groove The inner wall of the needle tube 1 is provided with a magnetic material to ensure that the front ends of the needle tube 1 and the needle core 2 overlap reliably. Although the outer diameter of the needle core 2 has an interference fit with the inner wall of the needle tube 1 and the needle core 2 can fit tightly when inserted into the needle tube 1, in order to avoid the needle core 2 partially withdrawing from the needle tube 1 during insertion, the holding handle at the tail end of the needle core 2 is made of a magnetic material or iron that is attracted to the holding handle. In this way, when the needle core 2 is fully inserted into the needle tube 1, the holding handle and the tail of the needle tube 1 are attracted to ensure the stability of the insertion of the needle core 2 during operation. In addition, in order to facilitate the removal of the needle core 2, the outer edge of the holding handle is larger than the tail end of the needle tube 1.

[0021] The core feature of the lumbar puncture needle is that a pressure relief groove 3 is designed on the needle core 2. The pressure relief groove 3 is a strip-shaped groove structure that penetrates into the axial direction of the needle core 2. The length of the pressure relief groove 3 accounts for 40%-75% of the length of the needle core 2 and does not extend to the front end of the needle core 2. The front end of the needle core 2 accounts for about 10% of the length of the needle core 2, and a pressure relief hole 4 is hollowed out in the center. The pressure relief hole 4 is a through hole that is connected to the pressure relief groove 3. This design of the front end can ensure that the needle core 2 and the needle tube 1 overlap reliably.

[0022] like Figure 2 As shown, it is another embodiment, the pressure relief groove 3 of the needle core 2 extends uniformly to the end, that is, the pressure relief hole 4 is no longer used to connect the interior, but after the needle core 2 is inserted into place, the front end of the needle tube 1 is in a flush state and there is no hole, then the front end part of the needle tube 2 adopts a hole 6 with a smaller inner diameter, the shape of which is completely matched with the outer diameter of the pressure relief groove 3 of the needle core 2, and when inserted, the pressure relief groove 3 at the front end of the needle core is completely filled in the hole 6.

[0023] For the convenience of use, medical personnel can know that the needle is about to be pulled out to the pressure relief groove 3 area. A marking line 5 is provided at the front of the needle core 2 near the starting end of the pressure relief groove 3. When in use, when the lumbar puncture needle reaches the spinal canal, only part of the needle core 2 needs to be pulled out, that is, a little bit of the pressure relief groove 3 is exposed. At this time, the outside and the inside of the body are connected through the pressure relief groove 3 and the pressure relief hole 4, which can be used to observe the pressure situation in the body and to reduce pressure. At the same time, like the traditional lumbar puncture needle, it can also detect whether it has really reached the spinal canal. If the outflow speed is not fast, the needle core 2 can be completely pulled out like a traditional puncture needle. If the outflow speed is too fast, it is necessary to continue to reduce the intracranial pressure. Do not pull out the needle core 2 blindly. At this time, you only need to insert the needle core 2 again to complete the capping, and then use other medical means to deal with it, so as to reduce the probability of medical accidents.

[0024] This patent only adds a little improvement on the original puncture needle, which can solve the clinical risk of fatal risks to patients due to increased intracranial pressure. The modification cost is low, the difficulty is small, and it is simple and easy to use in clinical practice.

[0025] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A lumbar puncture needle, comprising a needle tube and a needle core, wherein the needle core is inserted from the tail of the needle tube to block the needle tube, and a gripping handle is provided at the tail end of the needle core, characterized in that: The needle core is provided with a pressure relief groove extending to the front end; The tail end of the needle core is provided with a protruding positioning protrusion, and the tail end of the needle tube is provided with a limiting groove for the positioning protrusion to sink into; The holding handle is made of magnetic material, and the tail of the needle tube is made of magnetic material or iron that is attracted to the holding handle.

2. The lumbar puncture needle according to claim 1, characterized in that: The outer diameter of the needle core has an interference fit with the inner wall of the needle tube, the length of the needle core is the same as the length of the needle tube, and when the needle core is fully inserted into the needle tube, the end of the needle core is flush with the end of the needle tube, and the needle core and the front end of the needle tube are provided with a wedge structure with the same inclination angle.

3. The lumbar puncture needle according to claim 2, characterized in that: The pressure relief groove is a strip-shaped groove structure extending deep into the axial direction of the needle core.

4. The lumbar puncture needle according to claim 1, 2 or 3, characterized in that: A marking line is arranged at the front of the needle core near the starting end of the pressure relief groove.

5. The lumbar puncture needle according to claim 4, characterized in that: The front end of the needle core is a structure with a pressure relief hole at the center, and the pressure relief hole is connected to the pressure relief groove.

6. The lumbar puncture needle according to claim 4, characterized in that: The front end of the needle tube is provided with a hole matching the shape of the pressure relief groove.

7. The lumbar puncture needle according to claim 5, characterized in that: The length of the pressure relief groove accounts for 40%-75% of the length of the needle core.

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