Puncture cannula

Abstract

The puncture cannula comprises a handle part, a puncture needle tube penetrating through the handle part and a plurality of supporting parts, all the supporting parts are arranged around the puncture needle tube and connected with the handle part, and all the supporting parts are arranged on the side, facing the puncture end of the puncture needle tube, of the handle part. The supporting part comprises a metal core layer and an anti-skid friction layer wrapping the metal core layer. The support part in a beard shape is a first support arm, the support part in a petal shape is a second support arm, the first support arms are arranged around the puncture needle tube, and the second support arms are arranged around the sides, away from the puncture needle tube, of the first support arms. According to the puncture cannula, the supporting part of the puncture cannula achieves firm fixation of the puncture needle tube and the skin through cooperation of the metal core layer and the anti-skid friction layer. And the puncture needle tube does not need to be fixed by additionally arranging a fixing device such as an adhesive tape after the puncture needle tube completes puncture, so that the operation is convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of medical devices, in particular to a puncture cannula. BACKGROUND

[0002] The puncture cannula is a minimally invasive surgical instrument, usually composed of a puncture needle and a puncture needle tube, and its core function is to establish and maintain a channel to the body cavity or target tissue during surgery.

[0003] During the operation, the doctor first inserts the puncture needle into the puncture needle tube, and then inserts the puncture needle together with the puncture needle tube into the human body. After reaching the position, the puncture needle is removed, and at this time the puncture needle tube has constructed a stable working channel, through which a radiofrequency ablation electrode can be placed. The radiofrequency ablation electrode destroys the lesion tissue or interrupts the abnormal nerve signal by releasing high-frequency current heat energy, thereby radically curing the disease or relieving the symptoms.

[0004] However, the puncture needle tube in the current puncture cannula is usually fixed on the human skin by adhesive tape after being inserted into the human body. The fixing ability of the adhesive tape is limited, and the adhesion of the adhesive tape is greatly reduced once the adhesive surface is contaminated. There are also schemes that use a fixing device to fix the puncture needle tube, such as the scheme disclosed in Chinese Utility Model Patent CN217338822U, which uses a fixing mechanism to fix the puncture needle tube, and the fixing mechanism can also be fixed on the surface of the human skin. However, the fixing mechanism is relatively large in size. Moreover, both schemes require the puncture needle tube to be fixed after puncturing, which is complicated to operate. SUMMARY

[0005] In view of the problems existing in the prior art, the present application discloses a puncture cannula, which is simple in structure, easy to use, and realizes effective fixation of the puncture needle tube.

[0006] The purpose of the present application is achieved by the following technical solutions: A puncture cannula, comprising a handle, a puncture needle tube penetrating through the handle, a plurality of support portions, each of the support portions being arranged around the puncture needle tube and connected with the handle, each of the support portions being arranged on one side of the handle facing the puncture end of the puncture needle tube, the support portion comprising a metal core layer and an anti-slip friction layer covering the metal core layer; the shape of the support portion is whisk-like or petal-like, the whisk-like support portion is a first support arm, and the petal-like support portion is a second support arm, and the number of the first support arms and the second support arms is a plurality; each of the first support arms is arranged around the puncture needle tube, and each of the second support arms is arranged around the side of the first support arm away from the puncture needle tube.

[0007] Furthermore, the handle is provided with an electrical connection port, and a piezoelectric material layer is provided between the metal core layer and the anti-slip friction layer. The electrical connection port is electrically connected to the piezoelectric material layer and is used to connect to an external device. The external device, the electrical connection port, and the piezoelectric material layer form a detection electrical circuit.

[0008] Furthermore, it also includes a cap with a built-in vibration motor, the cap being detachably connected to the handle.

[0009] Furthermore, the insertion end of the puncture needle tube is provided with a serrated surface inclined to the radial cross-section of the puncture needle tube.

[0010] Furthermore, the metal core layer is a shape memory alloy core layer.

[0011] Furthermore, it also includes a limiting ring, and each of the second support arms is movably connected to the limiting ring, which can move along the axis of the puncture needle tube.

[0012] Furthermore, the limiting ring is provided with several through holes, and each of the second support arms passes through different through holes.

[0013] Furthermore, the second support arm has a raised arc surface on the side away from the puncture needle tube, and the raised arc surface restricts the second support arm from leaving the through hole.

[0014] Furthermore, at least two raised arc surfaces are provided, and the arch height and arc surface diameter of each raised arc surface gradually increase as it moves away from the handle.

[0015] Furthermore, a sliding block is connected between the handle and the first support arm, and the outer wall of the sliding block is movably connected to the inner wall of the limiting ring.

[0016] Compared with existing technologies, the advantages of this invention are as follows: By providing a whisker-shaped first support arm and a petal-shaped second support arm on the outside of the puncture needle, the metal core layers of both the first and second support arms bend and deform during the insertion of the puncture needle into the human body, with one end of the support contacting the human skin. The deformed first and second support arms act as a support structure, holding the puncture needle in place. Simultaneously, due to the light weight of the puncture needle, the first and second support arms in contact with the skin are less likely to move due to the weight of the puncture needle, thanks to the friction between the anti-slip friction layer and the skin surface. This invention achieves a firm fixation between the puncture needle and the skin through the cooperation of the metal core layer and the anti-slip friction layer. Furthermore, the fixation of the puncture needle is completed simultaneously with the puncture. There is no need to use additional fixing devices such as tape to secure the puncture needle after puncture, making the operation convenient. Attached Figure Description

[0017] Figure 1 This is a front view of the puncture cannula of the present invention in its pre-use state; Figure 2 This is a three-dimensional schematic diagram of the puncture needle and the first support arm in the puncture cannula of the present invention; Figure 3 This is a three-dimensional schematic diagram of the puncture cannula of the present invention, with the limiting ring in the first position and the puncture cannula in the pre-use state. Figure 4 This is a three-dimensional schematic diagram of the puncture cannula of the present invention, with the limiting ring in the second position and the puncture cannula in use. Figure 5 This is a front view of the puncture cannula of the present invention in use; Figure 6 for Figure 5 Enlarged diagram of section A in the middle; Figure 7 for Figure 1 Sectional view of section BB.

[0018] In the picture: 1-Handle; 2-Puncture needle; 3-First support arm; 4-Second support arm; 4a-First raised arc surface; 4b-Second raised arc surface; 5-Cap; 6-Limiting ring; 7-Sliding block. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0022] To address the shortcomings of existing puncture needles in terms of inconvenient fixation, this invention discloses a puncture cannula. For example... Figure 1 As shown, the puncture cannula of the present invention includes a handle 1, a puncture needle 2 penetrating the handle 1, and several support portions. After the puncture needle 2 is inserted into the human body, a radiofrequency ablation electrode can pass through the puncture needle 2 to discharge and destroy the lesion tissue. The handle 1 and the puncture needle 2 are fixedly connected, specifically by welding, or by providing a puncture needle limiting ring on the handle 1, which secures the puncture needle 2 to the handle 1. The handle 1 and the support portions in this invention serve to fix the puncture needle 2; the combination of the handle 1 and the support portions is equivalent to a fixing device for fixing the puncture needle 2. In this invention, each support portion is arranged around the puncture needle 2 and is connected to the handle 1, specifically by adhesive bonding or snap-fit ​​connection. Each support portion is located on the side of the handle 1 facing the insertion end of the puncture needle 2. The support component includes a metal core layer and an anti-slip friction layer covering the metal core layer. The metal core layer can bend under stress, and when the metal core layer is almost unloaded, it can provide support for other objects. During manufacturing, the metal core layer can be pre-machined, and then placed into an injection mold. An anti-slip friction layer is then formed on the surface of the metal core layer through injection molding.

[0023] The steps for using the puncture cannula of the present invention are as follows: Step 1: Insert the puncture needle into puncture needle tube 2; Step 2: The surgeon holds the handle 1 and slowly inserts the puncture needle 2 into the body; during this process, the metal core layer is bent and deformed under force, and the support part comes into contact with the skin surface; Step 3: The puncture needle 2 is inserted into the surgical site. At this time, a large area of ​​the support part is in contact with the skin surface. The anti-slip friction layer on the surface of the support part generates friction to prevent the support part from easily shifting from the skin surface. Since the puncture needle 2 is relatively light, its gravity will hardly exert a force on the metal core layer that would cause the metal core layer to deform. Therefore, the metal core layer inside the support part can provide support for the puncture needle 2, making it difficult for the puncture needle 2 to move. At the same time, due to the flexibility of the metal core layer, the puncture needle 2 can be inserted into the human body vertically or at an angle. Step 4: Remove the puncture needle located inside puncture needle tube 2; Step 5: Pass the radiofrequency ablation electrode through the puncture needle tube 2. After the working end of the radiofrequency ablation electrode reaches the surgical position, discharge is performed. Step Six: Complete the radiofrequency ablation procedure by simultaneously removing the puncture needle 2 and the radiofrequency ablation electrode from the body.

[0024] The puncture cannula of this invention features a support portion on the outside of the puncture needle 2. During insertion into the body, the metal core layer of the support portion bends and deforms, with one end of the support portion contacting the skin. The deformed support portions act as a support frame, holding the puncture needle 2 in place. Simultaneously, due to the lightweight nature of the puncture needle 2 and the presence of an anti-slip friction layer, friction is generated in the support portion in contact with the skin, preventing movement due to the weight of the needle. This invention achieves a secure fixation of the puncture needle 2 to the skin through the combination of the metal core layer and the anti-slip friction layer. Furthermore, the fixation of the puncture needle 2 is completed simultaneously with puncture, eliminating the need for additional fixing devices such as tape after puncture, thus simplifying the operation.

[0025] In the puncture cannula of the present invention, many technical features such as the shape of the support portion and the material of the metal core layer have multiple implementations. Below, for each of these technical features, including the shape of the support portion, one implementation is selected for detailed description. The embodiment in which this implementation is located is referred to as this embodiment. Other implementations of the support portion and other features are referred to as other embodiments, which are briefly described below.

[0026] In this embodiment, as Figure 2 As shown, the support portion is shaped like whiskers, and this whisker-shaped support portion is the first support arm 3. Specifically, the first support arm 3 can be as follows: Figure 2As shown, each first support arm 3 can be arranged in a circle around the puncture needle tube 2. Because the support portion is designed in a whisker-like shape, when the puncture needle tube 2 is inserted into the skin, a large number of whisker-like first support arms 3 will contact the skin surface. With the help of the anti-slip friction layer, there is a large frictional force between the first support arms 3 and the skin surface, which helps to fix the puncture needle tube 2. In other embodiments, the first support arms 3 can also be densely arranged like the bristles of a brush, with the puncture needle tube 2 located in the center of the area formed by each first support arm 3. In other embodiments, the radial cross-sectional shape of the first support arm 3 can be circular or polygonal.

[0027] In this embodiment, as Figure 3 and Figure 4 As shown, if the support portion is only wispy in shape, even with a large number of first support arms 3 arranged like bristles, the supporting force of the support portion is still slightly insufficient. Meanwhile, since the anti-slip friction layer is exposed, the puncture cannula needs additional protection during transportation to prevent the surface of the anti-slip friction layer from becoming covered with dirt. Therefore, in the puncture cannula of the present invention, in addition to the wispy support portion, there is also a petal-shaped support portion, which is the second support arm 4. The number of both the first support arm 3 and the second support arm 4 is several, such as... Figure 3 and Figure 4 In this invention, there are five first support arms 3 and five second support arms 4. Each first support arm 3 is arranged in a circle, and the first support arm circle formed by the first support arms 3 is fitted over the outside of the puncture needle tube 2 and is coaxial with the puncture needle tube 2. Each second support arm 4 is located on the side of the first support arm 3 away from the puncture needle tube 2, and each second support arm 4 is also arranged in a circle. The second support arm circle formed by the second support arms 4 is fitted over the outside of the first support arm circle and is coaxial with the first support arm circle. This invention, through the arrangement of the petal-shaped second support arms 4, allows for better ventilation before the puncture cannula is used. Figure 3 As shown, the second support arms 4 close together, enclosing the first support arm 3 inside the second support arm 4, thus effectively protecting the anti-slip friction layer on the first support arm 3. Meanwhile, during use, the puncture cannula of this invention... Figure 4As shown, the second support arm 4 opens, and the anti-slip friction layer on the side of the second support arm 4 facing the first support arm 3 contacts the skin surface. Since the second support arms 4 are closed together before the puncture cannula is used, the anti-slip friction layer on the side of the second support arm 4 facing the first support arm 3 is also effectively protected. Furthermore, during puncture, the second support arms 4 open and deform. Because the petal-shaped second support arms 4 have a larger volume, they provide better support than the whisker-shaped first support arms 3. That is, when the puncture cannula of the present invention is inserted to the designated surgical position, the second support arms 4 provide better support for the puncture needle 2; while the first support arm 3 has a larger contact area with the skin, thus providing greater friction. The cooperation between the first support arm 3 and the second support arm 4 ensures the puncture needle 2 is firmly fixed. In other embodiments, only the first support arm 3 may be provided, but the radial cross-sectional area of ​​the first support arm 3 gradually increases as it moves away from the handle 1, increasing the support force of the first support arm 3. At the end of the first support arm 3 furthest from the handle 1, barbs are provided on the outside of the anti-slip friction layer, with the barbs facing towards the puncture needle tube 2. The barbs increase the gripping force of the first support arm 3 on the skin. In other embodiments, only the second support arm 4 may be provided, in which case barbs are also provided on the outside of the anti-slip friction layer at the end of the second support arm 4 furthest from the handle 1. In other embodiments, the second support arms 4 may also be staggered.

[0028] In this embodiment, as Figure 3 and Figure 4 As shown, the metal core layer is a shape memory alloy core layer, meaning that both the first support arm 3 and the second support arm 4 contain shape memory alloy. The shape memory alloy provides support while also being able to bend under force. When the temperature of the shape memory alloy changes to a set temperature after bending, it automatically returns to its original shape. In this embodiment, at room temperature, the states of the first support arm 3 and the second support arm 4 are as follows... Figure 2 and Figure 3 As shown, the first support arm 3 tightly wraps around the puncture needle 2, and the second support arm 4 tightly wraps around the first support arm 3. When the puncture cannula is removed from the body after use, both the first support arm 3 and the second support arm 4 are in an extended state. The shape memory alloy core layer is designed to return to its original shape at high temperatures. At this time, the puncture cannula of this invention can be placed in a high-temperature moist heat sterilization environment, and the first support arm 3 and the second support arm 4 can return to their original shape upon heating. Figure 3 The state shown is as described. Therefore, by setting the metal core layer as a shape memory alloy core layer, the present invention facilitates the reuse of the puncture cannula. In other embodiments, since shape memory alloys are relatively expensive, in order to reduce the production cost of the puncture cannula, the metal core layer can also be made of ordinary alloy steel.

[0029] In this embodiment, the anti-slip friction layer can be a silicone layer. Silicone is a hydrophobic material, exhibiting significant friction with human tissue. Furthermore, silicone is an inert material with very stable chemical properties, typically not reacting with human tissue, blood, or body fluids, and rarely causing allergic or rejection reactions. Simultaneously, silicone exhibits selective permeability to gases such as oxygen and carbon dioxide, providing excellent breathability. In other embodiments, the anti-slip friction layer can also be an organosilicon gel or a thermoplastic elastomer.

[0030] In this embodiment, as Figure 5 As shown, the handle 1 has an electrical connection port. A piezoelectric material layer is disposed between the metal core layer and the anti-slip friction layer. The piezoelectric material layer can be made of a piezoelectric polymer such as polyvinylidene fluoride (PVDF) film, or it can be made of piezoelectric ceramic. The anti-slip friction layer can be a silicone layer doped with polyvinylidene fluoride / chitosan. The electrical connection port is electrically connected to the piezoelectric material layer, which can be achieved by wrapping aluminum foil and copper foil at both ends of the piezoelectric material layer, respectively, and connecting the aluminum foil and copper foil to the electrical connection port via wires. The electrical connection port is used for plugging and connecting to an external device. The external device, the electrical connection port, and the piezoelectric material layer form a detection electrical circuit. Specifically, the detection electrical circuit can be: external device, electrical connection port, aluminum foil, piezoelectric material layer, copper foil, electrical connection port, and external device.

[0031] When the puncture cannula is inserted into the human body and detection is required, the external device is connected to the electrical connection port. The detection circuit can detect convulsion signals. When the human body convulses, the doctor is performing surgery while holding the radiofrequency ablation electrode. That is, the doctor will grasp the puncture cannula of this invention. The physical movement of the convulsion will cause relative movement between the skin and the first support arm 3, thereby causing deformation of the piezoelectric electrode material. In turn, the piezoelectric electrode material generates an electrical signal that is transmitted to the external device. If the external device is connected to the electrical connection port during the insertion of the puncture cannula, the overall bending of the first support arm 3 can also cause deformation of the piezoelectric electrode material, thereby detecting the degree of contact between the first support arm 3 and the skin.

[0032] This invention, through the arrangement of a piezoelectric material layer and an electrical connection port, can detect different information such as twitching and the degree of contact between the first support arm 3 and the skin. In other embodiments, the electrical connection port may not be located on the handle 1 and can be directly connected to the support portion. In other embodiments, since there are several first support arms 3 (i.e., at least two), the detection electrical circuit may differ from that of this embodiment. If body fat percentage needs to be detected, the metal core layer can be a memory metal core layer, and the anti-slip friction layer can be a conductive silicone layer. The detection electrical circuit consists of: an external device, an electrical connection port, a first support arm 3, skin, another first support arm 3, an electrical connection port, and an external device. The external device emits a small current to the skin, and the current is conducted within the body and returns to the external device. The detection principle is the same as that of a body fat scale for detecting body fat percentage.

[0033] In this embodiment, as Figure 3 and Figure 4 As shown, the puncture cannula of the present invention also includes a cap 5 with a built-in vibration motor, and the cap 5 is detachably connected to the handle 1. The cap 5 is mainly used for the process of slowly inserting the puncture needle 2 into the body in step two above. Specifically, after inserting the puncture needle into the puncture needle 2 in step one, the cap 5 needs to be installed onto the handle 1. During the process of the puncture needle 2 being inserted into the body, the vibration motor inside the cap works, generating low-frequency vibration, which drives the puncture needle 2 to vibrate. The vibration direction can be along the radial direction of the puncture needle 2, so the puncture needle 2 is easier to insert into the skin. After the puncture needle 2 is inserted into place, the cap 5 and the handle 1 are separated. In other embodiments, a lubricating coating can also be applied to the outer surface of the puncture needle 2 to facilitate the insertion of the puncture needle 2.

[0034] In this embodiment, as Figure 5 and Figure 6 As shown, the insertion end of the puncture needle tube 2 is provided with a serrated surface inclined to the radial cross-section of the puncture needle tube 2. By providing the serrated surface, when the cap 5 vibrates, the serrated surface generates a saw-like cutting force, further facilitating the insertion of the puncture needle tube 2. In other embodiments, the insertion end of the puncture needle tube 2 can also be provided as a triangular needle tip.

[0035] In this embodiment, as Figure 3 and Figure 4 As shown, the puncture cannula of the present invention also includes a limiting ring 6, and each of the second support arms 4 is movably connected to the limiting ring 6. The limiting ring 6 can move along the axial direction of the puncture needle tube 2. There are various ways in which the second support arms 4 are movably connected to the limiting ring 6. For example, the limiting ring 6 can be sleeved on the outside of the second support arm ring formed by each of the second support arms 4; or the limiting ring 6 and each of the second support arms 4 can be connected by a protrusion and groove. Since one end of the second support arm 4 is connected to the handle 1, and due to the restriction of the limiting ring 6, the second support arm 4 between the limiting ring 6 and the handle 1 is not easily deformed during the implantation of the puncture cannula; while the second support arm 4 on the side of the limiting ring 6 away from the handle 1 is easily deformed after contact with the skin. Therefore, by adjusting the relative position of the limiting ring 6 and the second support arm 4, the volume of the easily deformable part in the second support arm 4 can be adjusted, ultimately affecting the puncture depth of the puncture needle tube 2. During the insertion of the puncture needle 2 into the human body, due to the influence of the limiting ring 6, the position of maximum deformation of the second support arm 4 is the maximum puncture depth of the puncture needle 2. For example... Figure 3 As shown, the limiting ring 6 is in the first position; as Figure 4As shown, the limiting ring 6 is in the second position. The distance between the limiting ring 6 and the handle 1 in the first position is greater than the distance between the limiting ring 6 and the handle 1 in the second position; that is, the deformation of the second support arm 4 in the first position is less than the deformation of the second support arm 4 in the second position; the insertion depth of the puncture needle 2 in the first position is less than the insertion depth of the puncture needle 2 in the second position. Before the operation, the surgeon adjusts the position of the limiting ring 6 to obtain the ideal maximum puncture depth of the puncture needle 2, which facilitates the surgical operation. In other embodiments, the handle 1 and the puncture needle 2 can also be set with a clearance fit. By adjusting the relative position between the handle 1 and the puncture needle 2, the maximum puncture depth of the puncture needle 2 can be adjusted. In this case, multiple slots arranged sequentially along the axis of the puncture needle 2 can be provided on the outer wall of the puncture needle 2, and multiple locking blocks can be provided on the handle 1. When the handle 1 and the puncture needle 2 are in the ideal relative position, the locking blocks and the slots are engaged to realize the connection between the handle 1 and the puncture needle 2.

[0036] In this embodiment, as Figure 1 and Figure 7 As shown, the limiting ring 6 has several through holes, and each second support arm 4 passes through a different through hole. At this time, the limiting ring 6, the second support arm ring formed by the second support arms 4, and the puncture needle tube 2 are all coaxially arranged. When the limiting ring 6 moves, the second support arms 4 move within the through holes. The present invention, through the arrangement of the through holes, makes the connection between the limiting ring 6 and the second support arms 4 compact, preventing them from easily separating and reducing the overall volume of the puncture cannula. In other embodiments, the connection between the limiting ring 6 and the second support arms 4 can be as described above, with the limiting ring 6 sleeved on the outside of the second support arm ring formed by the second support arms 4.

[0037] In this embodiment, as Figure 1 and Figure 7 As shown, a sliding block 7 is connected between the handle 1 and the first support arm 3, and the sliding block 7 is coaxially arranged with the puncture needle tube 2. The outer wall of the sliding block 7 is movably connected to the inner wall of the limiting ring 6. The connection between the outer wall of the sliding block 7 and the inner wall of the limiting ring 6 can be as follows: Figure 7 The spline connection shown can be used, where the outer wall of the sliding block 7 connects to the inner wall of the limiting ring 6 via a snap-fit ​​or slot connection. The invention, through the inclusion of the sliding block 7, makes the relative movement between the limiting ring 6 and the second support arm 4 more stable. In other embodiments, the sliding block 7 may be omitted.

[0038] In this embodiment, as Figure 1As shown, the second support arm 4 has a raised arc surface on the side away from the puncture needle 2. This raised arc surface restricts the second support arm 4 from leaving the through hole. That is, the projection of the radial section of the raised arc surface onto the plane containing the radial section of the through hole is not entirely within the radial section of the through hole. There are at least two raised arc surfaces, and the arch height (the vertical distance from the highest point of the raised arc surface's center to the plane containing the edge of the raised arc surface's diameter) and the diameter of the arc surface (the diameter of the raised arc surface) of each raised arc surface gradually increase away from the handle 1. This design facilitates the surgeon's gripping of the puncture cannula while providing good support for the second support arm 4. Figure 1 As shown, in this embodiment, there are two raised arc surfaces: a first raised arc surface 4a and a second raised arc surface 4b. The arch height and arc diameter of the first raised arc surface 4a are both smaller than those of the second raised arc surface 4b. Before use, the second support arms 4 cooperate to form a gourd shape. The raised arc surfaces have two advantages: first, they increase the support effect of the second support arms 4; second, they prevent the limiting ring 6 from separating from the second support arms 4. In other embodiments, the raised arc surfaces on the second support arms 4 can also have the same structure.

[0039] In summary, the puncture cannula of the present invention, through the cooperation of a metal core layer and an anti-slip friction layer, achieves a firm fixation between the puncture needle 2 and the skin, eliminating the need for additional fixing devices such as tape after puncture, thus simplifying operation. The addition of a whisker-shaped first support arm 3 increases the contact area between the first support arm 3 and the skin surface, further aiding in the fixation of the puncture needle 2. The interplay between the first support arm 3 and the second support arm 4, shaped like a petal, ensures a stable fixation of the puncture needle 2. The use of a shape memory alloy core layer for the metal core layer facilitates the reusability of the puncture cannula. The piezoelectric material layer and electrical connection port enable the detection of different information such as human convulsions and the degree of contact between the first support arm 3 and the skin. The cap 5 with a built-in vibration motor makes it easier for the puncture needle 2 to penetrate the skin. The serrated surface further facilitates the insertion of the puncture needle 2. The limiting ring 6 ensures the optimal maximum puncture depth for the puncture needle 2, facilitating surgical procedures. Several through holes in the limiting ring 6 allow the second support arm 4 to pass through, ensuring a tight connection between the limiting ring 6 and the second support arm 4. The sliding block 7 further stabilizes the relative movement between the limiting ring 6 and the second support arm 4. The raised arc surface enhances the support effect of the second support arm 4.

[0040] It should be emphasized that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A puncture cannula, characterized in that, It includes a handle (1), a puncture needle tube (2) passing through the handle (1), and several support parts. Each support part is arranged around the puncture needle tube (2) and is connected to the handle (1). Each support part is arranged on the side of the handle (1) facing the insertion end of the puncture needle tube (2). Each support part includes a metal core layer and an anti-slip friction layer covering the metal core layer. The support parts are shaped like whiskers and petals. The whisker-shaped support part is the first support arm (3), and the petal-shaped support part is the second support arm (4). There are several first support arms (3) and second support arms (4). Each first support arm (3) is arranged around the puncture needle tube (2), and each second support arm (4) is arranged around the first support arm (3) on the side away from the puncture needle tube (2).

2. The puncture cannula according to claim 1, characterized in that, An electrical connection port is provided on the handle (1), and a piezoelectric material layer is provided between the metal core layer and the anti-slip friction layer. The electrical connection port is electrically connected to the piezoelectric material layer and is used to connect to an external device. The external device, the electrical connection port, and the piezoelectric material layer form a detection circuit.

3. The puncture cannula according to claim 1, characterized in that, It also includes a cap (5) with a built-in vibration motor, which is detachably connected to the handle (1).

4. The puncture cannula according to claim 3, characterized in that, The insertion end of the puncture needle (2) is provided with a serrated surface that is inclined to the radial cross section of the puncture needle (2).

5. The puncture cannula according to claim 1, characterized in that, The metal core layer is a shape memory alloy core layer.

6. The puncture cannula according to claim 1, characterized in that, It also includes a limiting ring (6), and each of the second support arms (4) is movably connected to the limiting ring (6), which can move along the axis of the puncture needle tube (2).

7. The puncture cannula according to claim 6, characterized in that, The limiting ring (6) is provided with several through holes, and each second support arm (4) passes through different through holes.

8. The puncture cannula according to claim 7, characterized in that, The second support arm (4) has a raised arc surface on the side away from the puncture needle tube (2), and the raised arc surface restricts the second support arm (4) from leaving the through hole.

9. The puncture cannula according to claim 8, characterized in that, At least two raised arc surfaces are provided, and the arch height and arc surface diameter of each raised arc surface gradually increase as it moves away from the handle (1).

10. The puncture cannula according to claim 7, characterized in that, A sliding block (7) is connected between the handle (1) and the first support arm (3), and the outer wall of the sliding block (7) is movably connected to the inner wall of the limiting ring (6).

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