Anti-injury and anti-clogging amniocentesis needle

Abstract

The utility model relates to puncture needle technical field especially prevents injury and the amniotic cavity puncture needle of block. Its technical scheme includes puncture needle sheath and with puncture needle sheath cover set puncture needle core, still includes connecting mechanism. The utility model discloses the cooperation of puncture needle sheath, puncture needle core, medical net, connecting mechanism and drive mechanism etc. structure, the medical net can be made from puncture needle sheath automatic release and automatic open after micro motor opens, the medical net after opening can separate puncture needle sheath and fetus completely, no matter how fetus moves will not block the hole of puncture needle sheath, can protect fetus from the danger of puncture needle sheath to stab, can guarantee the process of extracting amniotic fluid after puncture to complete smoothly and fast. Not only can improve pregnant woman amniotic cavity puncture extraction amniotic fluid success rate and efficiency under the condition of fully protecting fetus, but also can reduce the risk of intrauterine infection and abortion etc., simultaneously alleviate the burden of clinician and ultrasonic doctor in the puncture process.

Description

Technical Field

[0001] This utility model relates to the field of puncture needle technology, and in particular to an amniocentesis needle that prevents damage and blockage. Background Technology

[0002] In existing techniques, before amniocentesis, the maximum amniotic fluid depth is determined and the needle is positioned using ultrasound before being inserted vertically into the amniotic cavity. Because the fetus moves freely within the uterine cavity, after the needle enters, fetal limbs may approach and block the tip of the needle sheath, affecting amniotic fluid extraction. Currently, it is usually necessary to wait for the fetal limbs to move away or adjust the needle position under ultrasound monitoring. However, in many cases, the results are unsatisfactory, sometimes requiring repositioning and puncture. This not only affects the efficiency of the entire amniotic fluid extraction process but, more importantly, increases the risk of fetal injury from the needle or increased risk of miscarriage and infection due to repeated punctures. Utility Model Content

[0003] The purpose of this invention is to address the issue that after the puncture needle enters the amniotic cavity, the fetal limb may approach and block the tip of the needle sheath, thus affecting the extraction of amniotic fluid. Currently, it is usually necessary to wait for the fetal limb to move away or adjust the position of the puncture needle under ultrasound monitoring. In this case, on the one hand, it affects the efficiency of the entire puncture and extraction of amniotic fluid, and more importantly, the fetus is easily injured by the puncture needle during this process, or the risk of miscarriage and infection increases due to repeated punctures. Therefore, this invention proposes an amniotic cavity puncture needle that prevents damage and blockage.

[0004] The technical solution of this utility model is as follows: an amniocentesis needle to prevent damage and blockage, including a needle sheath and a needle core fitted with the needle sheath, and a connecting mechanism fixedly connected to the ends of the needle sheath and the needle core to enable quick assembly or disassembly between the needle sheath and the needle core; a medical mesh that automatically pops out from the inner wall of the needle sheath; and a driving mechanism provided on the connecting mechanism to automatically retract the medical mesh that pops out from the needle sheath.

[0005] Optionally, the driving mechanism includes a connecting block fixedly connected to the connecting mechanism. The connecting block has a micro motor inside. The output shaft of the micro motor is fixedly connected to a winding cylinder. Both ends of the winding cylinder are fixedly fitted with baffles. The puncture needle sheath has a pull wire inside, the end of which is fixedly connected to a medical mesh. The end of the pull wire away from the medical mesh passes through the connecting mechanism and the connecting block and is fixedly connected to the winding cylinder.

[0006] Optionally, the inner wall of the connecting block is fixedly connected to a power source that is electrically connected to the micro motor.

[0007] Optionally, the drive mechanism also includes a switch button disposed on the outer wall of the connecting block, which turns the micro motor on or off by pressing.

[0008] Optionally, the connecting mechanism includes a fixing block fixedly connected to the end of the puncture needle sheath, the fixing block having a pair of fixing slots, the end of the puncture needle core being fixedly connected to an end head, the end head having a fixing slot for the fixing block to engage, the fixing slot having a fixing protrusion that engages with the fixing slot, and the outer wall of the fixing block being fixedly connected to the connecting block.

[0009] Optionally, the medical mesh is made of shape memory alloy.

[0010] Optionally, the fixing slot and fixing protrusion are symmetrically arranged with the puncture needle sheath and puncture needle core as the center.

[0011] In summary, this application includes at least one of the following beneficial technical effects:

[0012] This invention utilizes the coordinated structure of a puncture needle sheath, a puncture needle core, a medical mesh, a connecting mechanism, and a driving mechanism. When the micro-motor is activated, the medical mesh automatically disengages from the puncture needle sheath and opens automatically. The opened medical mesh completely isolates the puncture needle sheath from the fetus, preventing blockage of the puncture needle sheath's opening regardless of fetal movement. This protects the fetus from the risk of needle puncture and ensures a smooth and rapid amniotic fluid extraction process. It not only improves the success rate and efficiency of amniotic fluid extraction while fully protecting the fetus and reducing the number of re-punctures required due to failed amniotic fluid extraction, but also reduces the risks of intrauterine infection and miscarriage, while lessening the burden on clinicians and ultrasound technicians during the puncture process. Attached Figure Description

[0013] Figure 1 A schematic diagram of the structure of the amniocentesis needle for preventing damage and blockage of this utility model is provided;

[0014] Figure 2 for Figure 1 A schematic diagram of the split structure;

[0015] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0016] Figure 4 This is a schematic diagram of the internal heating channel of the amniocentesis needle.

[0017] Reference numerals: 1. Puncture needle sheath; 11. Fixing block; 12. Fixing slot; 2. Puncture needle core; 21. Fixing slot; 22. Fixing protrusion; 23. End; 3. Connecting block; 31. Micro motor; 32. Power supply; 33. Winding cylinder; 34. Baffle; 35. Switch button; 4. Medical mesh; 41. Pull thread; 5. Spiral channel; 51. Hot channel; 52. Cold channel; 6. Liquid storage tank; 7. Heating device. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0019] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0020] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Example

[0025] like Figure 1 , Figure 2 As shown, the amniocentesis needle for preventing damage and blockage proposed in this utility model includes a needle sheath 1 and a needle core 2 fitted with the needle sheath 1. It also includes a connecting mechanism, fixedly connected to the ends of the needle sheath 1 and the needle core 2 to allow for quick assembly or disassembly between the needle sheath 1 and the needle core 2; and a medical mesh 4 that automatically pops out from the inner wall of the needle sheath 1. The medical mesh 4 is made of a shape memory alloy. Shape memory alloys are primarily nickel-titanium alloys, which are alloys with shape memory properties, typically composed of nickel and titanium. This alloy can undergo a phase transition within a certain temperature range (its elastic change temperature is usually around 37°C, close to human body temperature, and will not cause damage to the human body), allowing it to recover its predetermined shape when heated or cooled. It can be connected to an external heating device 7 via a heat-conducting structure. The heating device 7 is a commercially available heater (this is prior art and will not be elaborated upon here), which heats the internal heat-conducting fluid, further transferring heat to the medical mesh 4. Specifically, as shown... Figure 4The diagram shows the heating channel inside the amniocentesis needle. By setting a dual-channel or multi-channel structure within the needle sheath 1, this embodiment employs a combination of a spiral channel 5, a hot channel 51, and a cold channel 52. The spiral channel 5 is positioned close to the inner side of the medical mesh 4, ensuring direct heat transfer. The spiral channel 5 extends beyond the end of the needle sheath 1, allowing the medical mesh 4 to be quickly heated and opened after release from the sheath. The hot channel 51 and cold channel 52 are connected to the spiral channel 5 via thin tubes, carrying fluid. One end of each channel is connected to an external heating device 7 and a reservoir 6, which stores fluid (such as silicone oil, fluorocarbons, or water). The hot channel 51 is positioned near the spiral channel 5, while the cold channel 52 is positioned closer to the axial direction of the needle sheath 1, further away from the medical mesh 4, facilitating rapid heat conduction. The specific heating process is as follows: After being heated by the heating device 7, the fluid is introduced into the hot channel 51 through a thin tube for high-temperature fluid input, and the cold channel 52 for low-temperature fluid output, forming a thermal cycle. When the high-temperature fluid flows inside the puncture needle sheath 1, it transfers heat to the puncture needle wall, and then to the medical mesh 4 at the end of the puncture needle, thus achieving heating. First, the puncture needle sheath 1 is inserted into the target position, and then the fluid is heated to the set temperature by the fluid heating device 7. Then, the high-temperature fluid is pumped into the input channel of the puncture needle sheath 1 through the thin tube, allowing it to release heat as it flows inside the puncture needle sheath 1. Afterward, the low-temperature fluid flows out from the output channel cold channel 52 and returns to the heating device 7 for reheating and circulation. By adjusting parameters such as the fluid temperature and flow rate, the temperature of the nickel-titanium alloy can be precisely controlled. When the temperature rises, the medical mesh 4 pops out of the puncture needle sheath 1 and can freely unfold in a mesh shape to a certain extent. When the medical mesh 4 enters the body and is not bound by the pull wire 41, the medical mesh 4 will disengage and open from the end of the fixing block 11 away from the puncture needle sheath 1.

[0026] Please see further. Figure 3As shown, in this embodiment, a drive mechanism is also installed at one end of the amniocentesis needle. This mechanism is mounted on the connecting mechanism to automatically retract the medical mesh 4 that ejects from the puncture needle sheath 1. Specifically, the drive mechanism includes a connecting block 3 fixedly connected to the connecting mechanism. A power supply 32 electrically connected to a micro motor 31 is fixedly connected to the inner wall of the connecting block 3. The micro motor 31 is housed inside the connecting block 3. The micro motor 31 is a small, low-power, high-precision electric motor, typically used to drive various small mechanical devices or achieve precise motion control. The micro motor 31 is usually very small, down to a few millimeters or even smaller. A winding cylinder 33 is fixedly connected to the output shaft of the micro motor 31. Baffles 34 are fixedly fitted at both ends of the winding cylinder 33, restricting the pull wire 41 wound around the winding cylinder 33 and preventing the pull wire 41 from becoming tangled. The puncture needle sheath 1 has a drawstring 41 inside, the end of which is fixedly connected to the medical mesh 4. The drawstring 41 is made of medical polyester thread, a commonly used high-strength fiber material with good mechanical properties, suitable for providing precise traction during surgery. Furthermore, the polyester material has high biocompatibility and can remain stable in vivo for a long time. The end of the drawstring 41 away from the medical mesh 4 passes through the connecting mechanism and connecting block 3 and is then fixedly connected to the winding cylinder 33.

[0027] in Figure 3 In the drive mechanism, there is also a switch button 35 disposed on the outer wall of the connecting block 3, which turns the micro motor 31 on and off by pressing. The switch button 35 is a switch button used to control the micro motor 31, and is usually called a micro switch, motor switch or power switch. Its function is to start or stop the operation of the micro motor 31.

[0028] Furthermore, the connecting mechanism includes a fixing block 11 fixedly connected to the end of the puncture needle sheath 1. The fixing block 11 has a pair of fixing slots 12. The fixing slots 12 and the fixing protrusions 22 are symmetrically arranged with the puncture needle sheath 1 and the puncture needle core 2 as the center. The end of the puncture needle core 2 is fixedly connected to an end head 23. The end head 23 has a fixing slot 21 for the fixing block 11 to be inserted into. The fixing slot 21 has a fixing protrusion 22 that is inserted into the fixing slot 12. The outer wall of the fixing block 11 is fixedly connected to the connecting block 3.

[0029] In this embodiment, when it is necessary to use an amniocentesis needle that is resistant to damage and blockage, such as Figure 2As shown, first, the puncture needle core 2 is inserted into the puncture needle sheath 1. Then, the end 23 of the puncture needle core 2 is pressed against the fixing block 11 on the end of the puncture needle sheath 1. At this time, the fixing slot 21 on the end 23 will first lock the fixing block 11, and then the fixing protrusion 22 in the fixing slot 21 will lock into the fixing groove 12 on the fixing block 11. Then, the maximum amniotic fluid depth is found and the puncture point is located using ultrasound. The puncture needle sheath 1 is then inserted perpendicularly at the puncture point. After the medical mesh 4 is heated, it opens in a mesh shape. The opened medical mesh 4 can completely isolate the puncture needle sheath 1 from the fetus. No matter how the fetus moves, it will not block the puncture needle sheath 1. This can protect the fetus from the danger of being punctured by the puncture needle sheath 1 and ensure that the amniotic fluid extraction process is completed smoothly and quickly after puncture. After the amniotic fluid is extracted, press the switch button 35. The winding cylinder 33 will drive the released pull line 41 to wrap around the winding cylinder 33. At this time, the end of the pull line 41 away from the winding cylinder 33 will pull the opened medical mesh 4 back into the puncture needle sheath 1. During the retraction, the temperature of the nickel-titanium alloy is controlled to reduce the shrinkage, and the pull force of the micro motor 31 driving the pull line 41 to retract will pull the medical mesh 4 back into the puncture needle sheath 1. Then, the amniocentesis needle can be removed to complete the entire operation. It is quick and easy to operate.

[0030] The preferred embodiments of this utility model described above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An amniocentesis needle designed to prevent damage and blockage, comprising a needle sheath (1) and a needle core (2) fitted to the needle sheath (1), characterized in that, Also includes: A connecting mechanism is fixedly connected to the ends of the puncture needle sheath (1) and the puncture needle core (2) to enable quick assembly or disassembly between the puncture needle sheath (1) and the puncture needle core (2); A medical mesh (4) that automatically pops out from the inner wall of the puncture needle sheath (1) is attached to the needle sheath; A drive mechanism is provided on the connecting mechanism to automatically retract the medical mesh (4) that ejects the puncture needle sheath (1).

2. The amniocentesis needle for preventing damage and blockage according to claim 1, characterized in that, The driving mechanism includes a connecting block (3) fixedly connected to the connecting mechanism. The connecting block (3) is equipped with a micro motor (31). The output shaft of the micro motor (31) is fixedly connected to a winding cylinder (33). Both ends of the winding cylinder (33) are fixedly fitted with baffles (34). The puncture needle sheath (1) is equipped with a pull wire (41) whose end is fixedly connected to a medical mesh (4). The end of the pull wire (41) away from the medical mesh (4) passes through the connecting mechanism and the connecting block (3) and is fixedly connected to the winding cylinder (33).

3. The amniocentesis needle for preventing damage and blockage according to claim 2, characterized in that, The inner wall of the connecting block (3) is fixedly connected to a power supply (32) that is electrically connected to the micro motor (31).

4. The amniocentesis needle for preventing damage and blockage according to claim 2, characterized in that, The drive mechanism also includes a switch button (35) located on the outer wall of the connecting block (3) to switch the micro motor (31) on and off by pressing.

5. The amniocentesis needle for preventing damage and blockage according to claim 2, characterized in that, The connecting mechanism includes a fixing block (11) fixedly connected to the end of the puncture needle sheath (1). The fixing block (11) has a pair of fixing slots (12). The end of the puncture needle core (2) is fixedly connected to an end head (23). The end head (23) has a fixing slot (21) for the fixing block (11) to be inserted into. The fixing slot (21) has a fixing protrusion (22) inside it that is inserted into the fixing slot (12). The outer wall of the fixing block (11) is fixedly connected to the connecting block (3).

6. The amniocentesis needle for preventing damage and blockage according to claim 5, characterized in that, The fixing slot (12) and fixing protrusion (22) are symmetrically arranged with the puncture needle sheath (1) and puncture needle core (2) as the center.

7. The amniocentesis needle for preventing damage and blockage according to claim 1, characterized in that, The medical mesh (4) is made of shape memory alloy.

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