Safe and adjustable lumbar puncture needle

Abstract

The utility model relates to the field of puncture medical instruments, in particular to a safe and adjustable lumbar puncture needle which comprises a handle, a device body with an inner cavity inside, a connecting rod at one end of the handle, a transmission block fixedly arranged on the periphery of the connecting rod and a blunt needle fixedly arranged at the other end, opposite to the handle, of the connecting rod. An inner cavity in the device body is divided into a large cavity on one side of the handle and a small cavity on the other side of the handle, the diameter of the large cavity corresponds to the outer edge of the limiting block, the diameter of the small cavity is smaller than that of the large cavity, a puncture needle penetrating out of the device body is fixedly arranged at the end, away from the handle, of the small cavity, and the blunt needle is arranged in the puncture needle after being assembled in the inner cavity of the device body. According to the puncture needle with the structure, the bending degree of the puncture needle head can be adjusted, the needle does not need to be replaced midway, the puncture position can be indicated through air pressure change in the device, the puncture success rate can be increased, pain of a patient is relieved, and operation of medical staff is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of puncture needles, and particularly relates to a safe and adjustable lumbar puncture needle. Background Art

[0002] During an actual lumbar puncture, the patient's intervertebral space is complex. Some patients may have scoliosis, excessive fat pad thickness, or difficulty adjusting their body position due to trauma. The puncture angle and position are crucial for a successful puncture, and the puncture angle must be flexibly adjusted according to the actual situation. However, existing lumbar puncture instruments have difficulty accurately controlling the puncture direction, often requiring repeated punctures. Furthermore, the frequent replacement of needles with different functions during the puncture process can easily cause additional damage during the puncture.

[0003] Therefore, there is an urgent need for a lumbar puncture needle with an adjustable curvature of the puncture needle during the puncture process. Utility Model Content

[0004] In view of the fact that the lumbar puncture needle in the prior art cannot adjust the curvature of the needle tip during the puncture process, which may easily cause additional damage, the present application proposes a safe and adjustable lumbar puncture needle, comprising a handle and a body with an inner cavity, a connecting rod arranged at one end of the handle, a transmission block fixedly arranged at the outer periphery of the connecting rod, and a blunt-tipped needle fixedly arranged on the other end of the connecting rod opposite to the handle; an opening communicating with the inner cavity of the body is arranged on one side of the body, and the puncture needle is fixedly arranged on the other side of the body; the transmission block penetrates the inner cavity of the body from the opening on one side of the body, and the blunt-tipped needle is arranged inside the puncture needle after being assembled in the inner cavity of the body; the puncture needle is hollow inside, and its end has a certain curvature and is elastic.

[0005] The utility model provides a safe and adjustable lumbar puncture needle, which includes a body and a handle at one end of the body. An inner cavity is provided in the body, and a transmission block fixedly connected to the handle is provided in the inner cavity. A hollow bendable puncture needle is provided at the other end of the body opposite to the handle, and a blunt-tipped needle is fixedly provided at the other end of the transmission block opposite to the handle. The blunt-tipped needle is provided in the hollow interior of the bendable puncture needle.

[0006] Preferably, a limit block is fixedly provided at one end of the transmission block away from the handle; and the diameter of the inner cavity of the device body corresponds to the outer edge of the limit block.

[0007] Preferably, the inner cavity inside the body is divided into a large cavity on one side of the handle and a small cavity on the other side. The diameter of the large cavity corresponds to the outer edge of the limit block, and the diameter of the small cavity is smaller than that of the large cavity.

[0008] Preferably, a bacterial filter membrane is provided on the side of the small cavity close to the handle, a one-way valve is provided on the side of the bacterial filter membrane away from the handle, and a puncture needle that passes through the device body is fixedly provided at the end of the small cavity away from the handle, and a through hole that cooperates with the blunt needle is provided on the bacterial filter membrane and the one-way valve.

[0009] The bacterial filter membrane can prevent external pathogens from entering the human body and causing infection when pushing or pulling the handle; the one-way valve limits the one-way flow of the medium entering the device body to prevent it from interfering with the process of pushing and pulling the handle; the through holes on the bacterial filter membrane and the one-way valve cooperate with the blunt-tipped needle, so that after the blunt-tipped needle passes through the bacterial filter membrane and the one-way valve, the space between the large cavity and the small cavity is isolated.

[0010] Preferably, the small cavity is provided with a bacteria filtering one-way valve and a hollow protrusion communicating with the small cavity on the side of the one-way valve away from the handle, and a sealing membrane is provided inside the hollow protrusion.

[0011] During the puncture process, before reaching the epidural space, the one-way valve, the small cavity in the body of the device, the hollow protrusion, the bacterial filter one-way valve, and the interlayer between the puncture needle and the blunt needle together form a closed space. Therefore, after the medium is injected into the interior, the sealing membrane inside the hollow protrusion bulges. After reaching the epidural space, the seal is lifted, the internal medium is released, and the sealing membrane is restored.

[0012] The puncture needle with this structure can adjust the curvature of the puncture needle head, eliminates the need for needle replacement, and can also indicate the puncture position through changes in air pressure within the device, which can improve the puncture success rate, reduce patient pain, and facilitate operation for medical staff.

[0013] Preferably, fine teeth are provided on the inner wall of the large cavity; and grooves corresponding to the fine teeth are provided on the limiting block.

[0014] Preferably, protrusions are provided on the inner wall of the large cavity at a certain interval.

[0015] More preferably, the inner wall of the large cavity is provided with two semicircular protrusions at a certain interval.

[0016] Most preferably, the protrusion on the inner wall of the large cavity is divided into a first protrusion at the end of the large cavity close to the handle, and a second protrusion in the middle of the large cavity. When the limit block is limited to the second protrusion, the blunt needle is flush with the needle tip of the puncture needle.

[0017] Through the cooperation of fine teeth and limit blocks, the distance between the handle and the transmission block can be fine-tuned; the protrusion can indicate the key position of the handle and the transmission block. When the limit block reaches the protrusion, a larger force needs to be applied, and the key position of the transmission block and the blunt needle is indicated by the perception of force.

[0018] Preferably, the handle is fixedly connected to the connecting rod, and the transmission block is fixedly arranged on the outer periphery of the connecting rod.

[0019] The utility model provides a safe and adjustable lumbar puncture needle, which achieves the following beneficial effects:

[0020] 1) By pushing or pulling the transmission block on the inner wall of the device body, the position of the blunt-tipped needle inside the puncture needle can be changed. The curvature of the puncture needle can be adjusted during the puncture process, and the puncture angle can be flexibly adjusted according to actual conditions, which helps to more accurately control the puncture direction. The fine teeth set on the inner wall can help fine-tune the transmission block, and the protrusion can indicate the key position of the blunt-tipped needle, which helps to reduce operational errors, reduce the burden on medical staff and patients, and improve puncture efficiency.

[0021] 2) During the puncture process, the blunt needle and the puncture needle can be switched conveniently and flexibly, without the need to change needles midway, thus avoiding additional damage during the puncture process;

[0022] 3) The bacteria filtering one-way valve, hollow protrusion, one-way membrane, and internal small cavity of the device body form a closed space with the human body during the puncture process. After the medium is injected into the interior, the sealing membrane on the protrusion bulges, which can indicate the change in pressure. After the puncture reaches the epidural space, the seal is released and the sealing membrane is reset to indicate the puncture process. After puncturing the epidural space, contrast agents, indicator media and other substances can also be injected into the bacteria filtering one-way valve to make them flow into the epidural space through the gap between the puncture needle and the blunt needle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is an overall schematic diagram of a safe and adjustable lumbar puncture needle;

[0024] Figure 2 It is an overall schematic diagram of the handle, connecting rod, transmission block and blunt needle;

[0025] Figure 3 It is the overall schematic diagram of the body;

[0026] Figure 4 This is a schematic diagram of the bulging state of the sealing membrane during lumbar puncture needle puncture;

[0027] Figure 5 This is a schematic diagram of the transmission block being limited at the junction of the large cavity and the small cavity;

[0028] Figure 6 for Figure 5 A magnified view of part A in FIG;

[0029] Figure 7 for Figure 5 A magnified view of part B in FIG;

[0030] Figure 8 Schematic diagram of the state of the limit block at different limit positions when the handle is pushed or pulled, where ① is a schematic diagram of the state of the limit block being limited at the second protrusion, ② is a schematic diagram of the state of the limit block being limited at the junction of the large cavity and the small cavity when the handle is pushed, and ③ is a schematic diagram of the state of the limit block being limited at the first protrusion when the handle is pulled.

[0031] Among them: 1 is the handle; 2 is the limit block; 3 is the body; 3-1 is the first protrusion limit; 3-2 is the second protrusion limit; 3-3 is the limit at the junction of the large cavity and the small cavity; 4 is the bacterial filter membrane; 5 is the one-way valve; 6 is the sealing membrane; 7 is the bacterial filter one-way valve; 8 is the puncture needle; 9 is the blunt needle; 10 is the transmission block; 11 is the connecting rod. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be further described below in conjunction with specific embodiments. These embodiments are only used to illustrate the technical solution of the present invention in more detail and should not be understood as limiting the scope of protection of the present invention.

[0033] Example 1

[0034] like Figure 1 and Figure 2 As shown, the safety adjustable lumbar puncture needle includes a handle 1 and a body 3 with an inner cavity therein, a connecting rod 11 at one end of the handle 1, a transmission block 10 fixedly arranged on the periphery of the connecting rod 11, and a blunt-tipped needle 9 fixedly arranged on the other end of the connecting rod 11 opposite to the handle 1, and a limit block 2 is provided on the end of the transmission block 10 away from the handle 1;

[0035] like Figure 3 As shown, the inner cavity inside the body 3 is divided into a large cavity on one side of the handle 1 and a small cavity on the other side. An opening connected to the large cavity is provided on one side of the body 3, and the transmission block 10 penetrates the large cavity of the body 3 from the opening on one side of the body 3. The blunt needle 9 is arranged inside the puncture needle 8 after being assembled in the inner cavity of the body 3; the diameter of the large cavity corresponds to the outer edge of the limit block 2, and the diameter of the small cavity is smaller than the large cavity. A bacteria filter membrane 4 is provided on the side of the small cavity close to the handle 1, and a one-way valve 5 is provided on the side of the bacteria filter membrane 4 away from the handle 1. The puncture needle 8 that passes through the body 3 is fixed at the end of the small cavity away from the handle 1. The blunt needle 9 is arranged inside the puncture needle 8 after being assembled in the inner cavity of the body 3, and a through hole for the blunt needle 9 to pass through is provided in the center of the bacteria filter membrane 4 and the one-way valve 5. The blunt needle 9 cooperates with the through hole in the center of the bacteria filter membrane 4 and the one-way valve 5. The blunt needle 9 seals the bacteria filter membrane 4 and the one-way valve 5 after passing through them.

[0036] The puncture needle 8 is hollow inside and has an inner diameter larger than the outer diameter of the blunt needle 9. The end thereof has a certain curvature and is elastic, including but not limited to 18G injection needles, 20G injection needles, 22G injection needles, and 24G injection needles.

[0037] By operating the handle 1, pushing or pulling the transmission block 10, the blunt needle 9 is driven to move relative to the inside of the puncture needle 8, and the position of the blunt needle 9 inside the puncture needle 8 can be easily adjusted, thereby adjusting the curvature of the puncture needle 8.

[0038] The small cavity is provided with a bacteria filtering one-way valve 7 and a hollow protrusion communicating with the small cavity on the side of the one-way valve 5 away from the handle 1 , and a sealing membrane 6 is provided inside the hollow protrusion.

[0039] like Figure 4 As shown, when the puncture begins, the blunt needle 9 is flush with the needle tip of the puncture needle 8. After the needle punctures the skin, the human body and the small cavity of the device, the hollow protrusion connected to the small cavity, the inside of the bacteria filtering one-way valve 7, and the interlayer of the puncture needle 8 and the blunt needle 9 together form a closed space. At this time, the indicator medium is injected into the closed space through the bacteria filtering one-way valve 7, so that the sealing membrane 6 gradually bulges under force. After it forms a certain arc, the injection is stopped, and the puncture is continued and the deformation of the sealing membrane 6 is observed. If the sealing membrane 6 is reset, it indicates that the indicator medium inside the sealed space is released and the puncture needle 8 has reached the epidural space.

[0040] After puncturing the epidural space, an indicator medium or contrast agent can be injected into the epidural space through the bacterial filter one-way valve 7. After entering the small cavity, the indicator medium or contrast agent passes through the interlayer between the puncture needle 8 and the blunt needle 9 and enters the puncture site.

[0041] like Figures 5 to 7 As shown, the inner wall of the large cavity is provided with fine teeth, and the stop block 2 is provided with grooves corresponding to the fine teeth. The cooperation between the stop block 2 and the fine teeth and grooves on the inner wall of the large cavity is the key to finely adjusting the displacement distance of the blunt-tipped needle 9 and, in turn, finely controlling the curvature of the puncture needle 8. The fine teeth can precisely control the displacement distance of the blunt-tipped needle 9, thereby achieving fine adjustment of the curvature of the puncture needle 8, which helps to reduce operational errors, alleviate the burden on medical staff and patients, and improve puncture efficiency.

[0042] The inner wall of the large cavity is provided with two semicircular protrusions at a certain interval, thereby forming three limits for the limit block on the inner wall of the large cavity, namely the limit at the junction of the large cavity and the small cavity, and the limit at the two protrusions, such as Figure 8 As shown, when the limit block 2 is located at the limit 3-2 of the protrusion (called the second protrusion) away from the side of the handle 1, the end of the blunt needle 9 is flush with the needle head of the puncture needle 8; when the handle 1 is pulled to make the limit block 2 located at the limit 3-1 of the protrusion (called the first protrusion) on one side of the handle 1, the end of the blunt needle 9 is located inside the puncture needle 8, and the puncture needle 8 has a certain curvature at this time; when the handle 1 is pushed to make the limit block 2 located at the limit 3-3 at the junction of the large cavity and the small cavity, the end of the blunt needle 9 passes through the needle head of the puncture needle 8.

[0043] When the limit block 2 passes the protrusion, a relatively large force needs to be applied to push or pull the handle 1, and the medical staff is informed by the force that the blunt needle 9 has reached the critical position.

[0044] The fine teeth, protrusions and limit block 2 on the inner wall of the body 3 in this device are all made of plastic and have a certain elasticity. When the limit block 2 passes through the protrusion on the inner wall of the body 3, the limit block 2 and the protrusion are squeezed and deformed to a certain extent. After passing through the protrusion, the squeezing disappears and the limit block 2 and the protrusion are reset.

[0045] The specific principle of using this solution is: when starting to puncture, the limit block 2 is located at the second protrusion, and the blunt needle 9 is flush with the needle tip of the puncture needle 8. According to the bulging and resetting of the sealing membrane 6, it is judged whether the needle tip has reached the epidural space. After puncturing the epidural space, the handle 1 is slowly pushed into the body 3 to expose the needle tip of the blunt needle 9 to the outside of the puncture needle 8, and the puncture is continued. The blunt needle 9 can reduce damage to the peripheral nerves and is beneficial to the patient's recovery. The pushing amplitude is adjusted according to the actual situation; when the needle tip of the puncture needle 8 reaches the vicinity of the target site, the handle 1 is slowly pulled to withdraw the blunt needle 9 to the inside of the puncture needle 8. When the curvature of the puncture needle 8 is adjusted to the required angle, the entire puncture is performed again to reach the target position.

[0046] It should be noted that during the puncture process, the body 3 can be rotated appropriately to adjust the bending direction of the puncture needle 8, but it is preferred to rotate the body 3 before puncture and start puncture after rotating it to the appropriate position. The rotation of the body 3 can also be fine-tuned during the withdrawal of the blunt needle 9 and before the bending degree of the puncture needle 8 reaches the maximum limit to reduce unnecessary damage.

[0047] Example 2

[0048] The structure of the lumbar puncture needle of this embodiment is basically the same as that of embodiment 1, with the only difference being that the first protrusion and the second protrusion described in embodiment 1 are not provided inside the body 3 of this embodiment, but only fine teeth are provided.

[0049] The only difference from Example 1 during use is that when pushing or pulling the handle 1, the fine teeth can slowly move the handle 1. However, since no protrusion is provided, it is impossible to judge whether the transmission block 10 inside the body 3 has reached the critical position by sensing the force. However, it can be assisted by observing the length of the handle 1 exposed from the body 3.

[0050] Example 3

[0051] The structure of the lumbar puncture needle of this embodiment is basically the same as that of embodiment 1, with the only difference being that the fine teeth described in embodiment 1 are not provided inside the body 3 of this embodiment, but only a first protrusion and a second protrusion are provided.

[0052] The only difference from Example 1 during use is that, when pushing or pulling the handle 1, due to the provision of the first protrusion and the second protrusion, it is possible to judge whether the transmission block 10 inside the body 3 has moved to the key position by sensing the force. When pushing the handle 1, there is no slow displacement effect produced by the fine teeth, but the functions of adjusting the curvature of the puncture needle and switching the needle can still be achieved.

[0053] Example 4

[0054] The structure of the lumbar puncture needle of this embodiment is basically the same as that of embodiment 1, with the only difference being that the fine teeth, the first protrusion and the second protrusion described in embodiment 1 are not provided inside the body 3 of this embodiment.

[0055] The only difference from Example 1 during use is that, when pushing or pulling the handle 1, there is no slow displacement effect of the fine teeth, nor is there the function of judging whether the transmission block 10 inside the body 3 has moved to the key position through force perception brought by the first and second protrusions. However, the judgment can be assisted by observing the length of the handle 1 exposed outside the body 3, and the functions of adjusting the curvature of the puncture needle and adjusting the needle tip can still be achieved.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any equivalent replacement, modification, etc. made by technicians in this field without any creative work within the spirit and principle of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A safe and adjustable lumbar puncture needle, comprising a handle (1) and a body (3) having an inner cavity, characterized in that: The invention also comprises a connecting rod (11) provided at one end of the handle (1), a transmission block (10) fixedly provided on the outer periphery of the connecting rod (11), and a blunt-tipped needle (9) fixedly provided on the other end of the connecting rod (11) relative to the handle (1); an opening communicating with the inner cavity of the device body (3) is provided on one side of the device body (3), and a puncture needle (8) is fixedly provided on the other side of the device body (3); the transmission block (10) penetrates into the inner cavity of the device body (3) from the opening on one side of the device body (3), and the blunt-tipped needle (9) is arranged inside the puncture needle (8) after being assembled in the inner cavity of the device body (3); the inside of the puncture needle (8) is hollow, and its end presents a certain curvature and is elastic.

2. The safe and adjustable lumbar puncture needle according to claim 1, characterized in that: A limiting block (2) is fixedly provided at one end of the transmission block (10) away from the handle (1); and the diameter of the inner cavity of the device body (3) corresponds to the outer edge of the limiting block (2).

3. The safe and adjustable lumbar puncture needle according to claim 2, characterized in that: The inner cavity of the body (3) is divided into a large cavity on one side of the handle (1) and a small cavity on the other side. The diameter of the large cavity corresponds to the outer edge of the limit block (2), and the diameter of the small cavity is smaller than the large cavity.

4. The safe and adjustable lumbar puncture needle according to claim 3, characterized in that: A bacterial filter membrane (4) is provided on the side of the small cavity close to the handle (1), a one-way valve (5) is provided on the side of the bacterial filter membrane (4) away from the handle (1), and a puncture needle (8) is fixedly provided at the end of the small cavity away from the handle (1) to pass through the device body (3), and a through hole is provided on both the bacterial filter membrane (4) and the one-way valve (5) to cooperate with the blunt needle (9).

5. The safe and adjustable lumbar puncture needle according to claim 4, characterized in that: The small cavity is provided with a bacteria filtering one-way valve (7) and a hollow protrusion communicating with the small cavity on the side of the one-way valve (5) away from the handle (1), and a sealing membrane (6) is provided inside the hollow protrusion.

6. The safety adjustable lumbar puncture needle according to any one of claims 3 to 5, characterized in that: Fine teeth are provided on the inner wall of the large cavity, and grooves corresponding to the fine teeth are provided on the limiting block (2).

7. The safe and adjustable lumbar puncture needle according to claim 6, characterized in that: The inner wall of the large cavity is provided with protrusions at a certain interval.

8. The safe and adjustable lumbar puncture needle according to claim 7, characterized in that: The inner wall of the large cavity is provided with two semicircular protrusions at a certain interval.

9. The safe and adjustable lumbar puncture needle according to claim 8, characterized in that: The protrusions on the inner wall of the large cavity are divided into a first protrusion at the end of the large cavity close to the handle (1), and a second protrusion in the middle of the large cavity. When the limit block (2) is limited to the second protrusion, the blunt needle (9) is flush with the needle tip of the puncture needle (8).

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