Puncture cannula

Abstract

The application discloses a puncture sleeve, which comprises a handle, a puncture needle tube penetrating through the handle, and a plurality of support parts, each of which is arranged around the puncture needle tube and connected with the handle, and each of which is arranged on one side of the handle towards a puncture end of the puncture needle tube, and the support part comprises a metal core layer and an anti-skid friction layer covering the metal core layer. The support part in the form of a whisker is a first support arm, and the support part in the form of a petal is a second support arm, each of the first support arms is arranged around the puncture needle tube, and each of the second support arms is arranged around one side of the first support arm away from the puncture needle tube. The puncture sleeve of the application realizes firm fixation of the puncture needle tube and the skin through cooperation of the metal core layer and the anti-skid friction layer. In addition, after the puncture needle tube completes puncture, it is not necessary to additionally set a fixing device such as a tape to fix the puncture needle tube, and 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:

[0007] 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.

[0008] Further, the handle is provided with an electrical connection port, a piezoelectric material layer is arranged between the metal core layer and the anti-skid friction layer, the electrical connection port is electrically connected with the piezoelectric material layer, and the electrical connection port is used for being connected with an external device; the external device, the electrical connection port and the piezoelectric material layer form a detection electric circuit.

[0009] Further, the handle is provided with an electrical connection port, a piezoelectric material layer is arranged between the metal core layer and the anti-skid friction layer, the electrical connection port is electrically connected with the piezoelectric material layer, and the electrical connection port is used for being connected with an external device; the external device, the electrical connection port and the piezoelectric material layer form a detection electric circuit.

[0010] Further, the handle is provided with an electrical connection port, a piezoelectric material layer is arranged between the metal core layer and the anti-skid friction layer, the electrical connection port is electrically connected with the piezoelectric material layer, and the electrical connection port is used for being connected with an external device; the external device, the electrical connection port and the piezoelectric material layer form a detection electric circuit.

[0011] Further, the metal core layer is a memory alloy core layer.

[0012] Further, a limiting ring is arranged, each second supporting arm is movably connected with the limiting ring, and the limiting ring can move along the axis direction of the puncture needle tube.

[0013] Further, the limiting ring is provided with a plurality of through holes, and each second supporting arm passes through a different through hole.

[0014] Further, the second supporting arm is provided with a convex arc surface away from the puncture needle tube, and the convex arc surface limits the second supporting arm from leaving the through hole.

[0015] Further, the second supporting arm is provided with a convex arc surface away from the puncture needle tube, and the convex arc surface limits the second supporting arm from leaving the through hole.

[0016] Further, the handle is provided with an electrical connection port, a piezoelectric material layer is arranged between the metal core layer and the anti-skid friction layer, the electrical connection port is electrically connected with the piezoelectric material layer, and the electrical connection port is used for being connected with an external device; the external device, the electrical connection port and the piezoelectric material layer form a detection electric circuit.

[0017] Compared with the prior art, the present application has the beneficial effects that: by arranging the first supporting arm in the form of a whisk and the second supporting arm in the form of a petal outside the puncture needle tube, when the puncture needle tube is inserted into the human body, the metal core layer of the first supporting arm and the second supporting arm is bent and deformed, and one end of the supporting part is in contact with the skin of the human body. The first supporting arm and the second supporting arm after deformation of the metal core layer support the puncture needle tube like a bracket. At the same time, due to the light weight of the puncture needle tube, under the friction force of the anti-skid friction layer and the skin surface, the first supporting arm and the second supporting arm in contact with the skin are not easy to move due to the gravity of the puncture needle tube. The present application realizes the firm fixation of the puncture needle tube and the skin through the cooperation of the metal core layer and the anti-skid friction layer. At the same time of puncture of the puncture needle tube, the fixation of the puncture needle tube is completed synchronously. It is not necessary to additionally arrange a fixing device such as adhesive tape to fix the puncture needle tube after the puncture of the puncture needle tube is completed, and the operation is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 This is a front view of the puncture cannula of the present invention in its pre-use state;

[0019] 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;

[0020] 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.

[0021] 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.

[0022] Figure 5 This is a front view of the puncture cannula of the present invention in use;

[0023] Figure 6 for Figure 5 Enlarged diagram of section A in the middle;

[0024] Figure 7 for Figure 1 A sectional view of section BB in the middle.

[0025] In the picture:

[0026] 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

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] The steps for using the puncture cannula of the present invention are as follows:

[0032] Step 1: Insert the puncture needle into puncture needle tube 2;

[0033] 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;

[0034] Step three: the puncture needle tube 2 is pierced into the operation position, at this time the support part has a larger area in contact with the skin surface, and the anti-skid friction layer on the surface of the support part generates friction to prevent the support part from easily moving on the skin surface; since the puncture needle tube 2 is light, its gravity will hardly generate a force to deform the metal core layer, so the metal core layer inside the support part can provide support for the puncture needle tube 2, so that the puncture needle tube 2 is not easy to move; at the same time, due to the flexibility of the metal core layer, the puncture needle tube 2 can be vertically or obliquely pierced into the human body;

[0035] Step four: the puncture needle in the puncture needle tube 2 is taken out;

[0036] Step five: the radiofrequency ablation electrode is inserted through the puncture needle tube 2, and the working end of the radiofrequency ablation electrode reaches the operation position and then discharges;

[0037] Step six: after the radiofrequency ablation operation is completed, the puncture needle tube 2 and the radiofrequency ablation electrode are taken out from the human body at the same time.

[0038] The puncture cannula of the present application is provided with a support part outside the puncture needle tube 2, when the puncture needle tube 2 is pierced into the human body, the metal core layer of the support part is bent and deformed, and one end of the support part is in contact with the skin of the human body. The deformed support part is equivalent to a support that supports the puncture needle tube 2. At the same time, due to the light weight of the puncture needle tube 2 and the setting of the anti-skid friction layer, the support part in contact with the skin generates friction, and the support part is not easy to move due to the gravity of the puncture needle tube. The present application realizes the firm fixation of the puncture needle tube 2 and the skin through the cooperation of the metal core layer and the anti-skid friction layer, and at the same time of puncturing the puncture needle tube 2, the fixation of the puncture needle tube 2 is completed, without the need for additional setting of a fixing device such as adhesive tape to fix the puncture needle tube 2 after the puncture needle tube 2 completes the puncture, which is convenient to operate.

[0039] In the puncture cannula of the present application, the shape of the support part, the material of the metal core layer and many other technical features have many implementation modes, in the following description of the shape of the support part and many other technical features, each technical feature is mainly selected from one of the implementation modes for detailed description, and the implementation example of the implementation mode is called the present example. The other implementation modes of the shape of the support part and many other features are called other examples, and the following is a brief description of the other examples.

[0040] In the present example, as shown in Figure 2 The shape of the support part is in the form of a whisker, and the support part in the form of a whisker is a first support arm 3. Specifically, the first support arm 3 can be as shown in Figure 2As shown, each first support arm 3 can be arranged in a circle around the puncture needle tube 2. Since the support part is arranged in a whisk shape, when the puncture needle tube 2 penetrates the skin, more whisk-shaped first support arms 3 will be in contact with the skin surface. With the help of the anti-skid friction layer, the first support arm 3 has a larger friction with the skin surface, which helps to fix the puncture needle tube 2. In other embodiments, the first support arm 3 can also be densely arranged like the bristles of a brush, and the puncture needle tube 2 is arranged in the middle 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, polygonal.

[0041] In this embodiment, as shown in Figure 3 and Figure 4 If the shape of the support part is only in a whisk shape, even if more first support arms 3 are arranged like bristles, the support force of the support part is slightly insufficient. At the same time, since the anti-skid friction layer is exposed, the anti-skid friction layer needs additional protection during transportation to avoid the surface of the anti-skid friction layer being stained with dirt. Therefore, in the puncture cannula of the present application, in addition to the whisk-shaped support part, there is also a petal-shaped support part, which is the second support arm 4. The number of first support arms 3 and second support arms 4 is several, as shown in Figure 3 and Figure 4 The number of first support arms 3 and second support arms 4 is five respectively, each first support arm 3 is arranged in a circle, and the first support arm ring formed by the first support arm 3 is arranged outside the puncture needle tube 2 and coaxially with the puncture needle tube 2. Each second support arm 4 is arranged 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, and the second support arm ring formed by the second support arm 4 is arranged outside the first support arm ring, and the second support arm ring is coaxially arranged with the first support arm ring. Through the arrangement of the petal-shaped second support arm 4, before the puncture cannula of the present application is used, as shown in Figure 3 each second support arm 4 is folded towards each other, wrapping the first support arm 3 inside the second support arm 4, which effectively protects the anti-skid friction layer on the first support arm 3. At the same time, during the use of the puncture cannula of the present application, as shown in Figure 4As shown, the second support arms 4 are opened, and the anti-skid friction layer on the side of the second support arms 4 facing the first support arms 3 is in contact with the skin surface. Since the puncture cannula is not used, the anti-skid friction layer on the side of the second support arms 4 facing the first support arms 3 is also effectively protected due to the mutual folding of the second support arms 4. In addition, during the puncture process, the second support arms 4 are opened and deformed, and since the petal-shaped second support arms 4 have a larger volume, they can provide better support than the mustache-shaped first support arms 3. That is, when the puncture cannula of the present application is inserted into the set surgical position, the second support arms 4 provide better support to the puncture needle tube 2; and the first support arms 3 have a larger contact area with the skin, so the first support arms 3 provide a larger friction force. The mutual cooperation of the first support arms 3 and the second support arms 4 makes the puncture needle tube 2 firmly fixed. In other embodiments, only the first support arms 3 can be provided, but the radial cross-sectional area of the first support arms 3 gradually increases away from the handle 1, thereby improving the support of the first support arms 3. At the end of the first support arms 3 away from the handle 1, a barb is further provided outside the anti-skid friction layer, and the barb is arranged towards the side of the puncture needle tube 2. The provision of the barb increases the holding force of the first support arms 3 on the skin. In other embodiments, only the second support arms 4 can be provided, and at the end of the second support arms 4 away from the handle 1, a barb is also provided outside the anti-skid friction layer. In other embodiments, the second support arms 4 can also be staggered.

[0042] In the present embodiment, as shown in Figure 3 and Figure 4 , the metal core layer is a memory alloy core layer, that is, the first support arms 3 and the second support arms 4 are both provided with memory alloys. The memory alloy can provide support while also being able to bend under force. And when the temperature of the memory alloy after being bent under force changes to a set temperature, the memory alloy can automatically restore to its original state. In the present embodiment, at room temperature, the first support arms 3 and the second support arms 4 are in the state as shown in Figure 2 and Figure 3 , the first support arms 3 tightly wrap the puncture needle tube 2, and the second support arms 4 tightly wrap the first support arms 3. When the use of the puncture cannula is completed and the puncture cannula is removed from the human body, the first support arms 3 and the second support arms 4 are both in an expanded state. The set memory alloy core layer restores to its original state at high temperature, at which time the puncture cannula of the present application can be placed in a high-temperature humid heat sterilization, and the first support arms 3 and the second support arms 4 can restore to the state as shown in Figure 3 by being heated. Therefore, by providing the metal core layer as a memory alloy core layer, the present application facilitates the reuse of the puncture cannula. In other embodiments, since memory alloys are relatively expensive, in order to reduce the production cost of the puncture cannula, the metal core layer can also be a common alloy steel material.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] In the embodiment, as shown in Figure 3 and Figure 4 , the puncture cannula of the present application further comprises a cap head 5 with a built-in vibration motor, which is detachably connected with the handle 1. The cap head 5 is mainly used for the process of slowly inserting the puncture needle tube 2 into the body in step two above. Specifically, after the puncture needle is inserted into the puncture needle tube 2 in step one, the cap head 5 needs to be installed to the handle 1. During the process of inserting the puncture needle tube 2 into the body, the vibration motor in the cap head works, and the vibration motor generates low-frequency vibration to drive the puncture needle tube 2 to vibrate. The vibration direction can be along the radial direction of the puncture needle tube 2, so that the puncture needle tube 2 is more easily inserted into the skin. After the puncture needle tube 2 is punctured in place, the cap head 5 is separated from the handle 1. In other embodiments, a lubricating coating can also be applied to the outer surface of the puncture needle tube 2 to facilitate the insertion of the puncture needle tube 2.

[0048] In the embodiment, as shown in Figure 5 and Figure 6 , the insertion end of the puncture needle tube 2 is provided with a sawtooth surface inclined to the radial section of the puncture needle tube 2. Through the arrangement of the sawtooth surface, when the cap head 5 vibrates, the sawtooth surface forms a cutting force similar to a saw, 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 with a three-pronged needle tip.

[0049] In the embodiment, as shown in Figure 3 and Figure 4 , the puncture cannula of the present application further comprises a limiting ring 6, each second supporting arm 4 is movably connected with the limiting ring 6, and the limiting ring 6 can move along the axial direction of the puncture needle tube 2. There are various ways for the second supporting arm 4 to be movably connected with the limiting ring 6, such as the limiting ring 6 can be sleeved outside the second supporting arm ring composed of each second supporting arm 4; or the limiting ring 6 and each second supporting arm 4 can be connected through protrusion and groove cooperation. Since one end of the second supporting arm 4 is connected with the handle 1, and due to the limitation of the limiting ring 6, the second supporting arm 4 between the limiting ring 6 and the handle 1 is not easy to deform during the implantation of the puncture cannula; and the second supporting arm 4 away from the handle 1 side of the limiting ring 6 is easy to deform after contacting with the skin. Therefore, by adjusting the relative position of the limiting ring 6 and the second supporting arm 4, the volume of the part of the second supporting arm 4 that is easy to deform can be adjusted, which ultimately affects the puncture depth of the puncture needle tube 2. As shown in Figure 3 , the limiting ring 6 is in the first position; as shown in Figure 4 , the limiting ring 6 is in the second position.As 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.

[0050] 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.

[0051] 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.

[0052] In this embodiment, as Figure 1As shown, the second support arm 4 is provided with a convex arc surface away from the puncture needle tube 2, which limits the second support arm 4 from leaving the through hole. That is, the radial section of the convex arc surface is projected on the plane of the radial section of the through hole, and is not completely in the radial section of the through hole. The convex arc surface is provided with at least two, and the arch height (the vertical distance from the highest point of the convex arc surface to the plane where the edge of the convex arc surface is located) and the arc surface diameter of each convex arc surface gradually increase away from the handle 1. This arrangement facilitates the surgeon to hold the puncture cannula, and makes the second support arm 4 have better supporting force. Figure 1 As shown, in the embodiment, the convex arc surface is provided with two, which are the first convex arc surface 4a and the second convex arc surface 4b. The arch height and the arc surface diameter of the first convex arc surface 4a are smaller than those of the second convex arc surface 4b. When the puncture cannula is used, each second support arm 4 cooperates with each other to form a gourd shape. The convex arc surface has two advantages, the first is to increase the supporting effect of the second support arm 4, and the second is to limit the separation of the limiting ring 6 and the second support arm 4. In other embodiments, the convex arc surfaces on the second support arm 4 can also have the same structure.

[0053] In summary, the puncture cannula of the present application realizes the firm fixation of the puncture needle tube 2 and the skin through the cooperation of the metal core layer and the anti-skid friction layer, and does not need to additionally set a fixing device such as a tape to fix the puncture needle tube 2 after the puncture needle tube 2 completes the puncture, which is convenient to operate. The first support arm 3 is provided in a whisk shape, which increases the contact area of the first support arm 3 and the skin surface, which is helpful to the fixation of the puncture needle tube 2. The second support arm 4 is provided in a petal shape, and the first support arm 3 and the second support arm 4 cooperate with each other to stably fix the puncture needle tube 2. The metal core layer is provided as a memory alloy core layer, which is convenient for the repeated use of the puncture cannula. The piezoelectric material layer and the electric connection port are provided, which can realize the detection of different information such as human convulsions and the contact degree of the first support arm 3 and the skin. The cap head 5 with the built-in vibration motor is provided, which makes the puncture needle tube 2 more easily penetrate into the skin. The sawtooth surface is provided, which further facilitates the penetration of the puncture needle tube 2. The limiting ring 6 is provided, which can obtain the ideal maximum puncture depth of the puncture needle tube 2, which is convenient for surgical operations. The limiting ring 6 is provided with a plurality of through holes through which the second support arm 4 passes, which makes the connection between the limiting ring 6 and the second support arm 4 compact. The sliding block 7 is provided, which makes the relative movement between the limiting ring 6 and the second support arm 4 more stable. The convex arc surface is provided, which increases the supporting effect of the second support arm 4.

[0054] It should be emphasized that: the above is only a preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made according to the technical essence of the present application to the above embodiment still belongs to the scope of the technical solution of the present application.

Claims

1. A puncture cannula, characterized in that, The utility model provides a kind of needle stick, including handle (1), puncture needle tube (2) passing through the handle (1), several support parts, each support part is arranged around the puncture needle tube (2) and is connected with the handle (1), each support part is arranged on the side of the handle (1) towards the puncture needle tube (2) end of penetration, the support part includes metal core layer and anti-skid friction layer covering the metal core layer;The shape of the support part is whisk and petal, the support part of whisk is first support arm (3), the support part of petal is second support arm (4), the number of the first support arm (3) and the second support arm (4) is provided with several;Each first support arm (3) is arranged around the puncture needle tube (2), and each second support arm (4) is arranged around the side of the first support arm (3) away from the puncture needle tube (2); The handle (1) is provided with an electrical connection port, a piezoelectric material layer is provided between the metal core layer and the anti-skid friction layer, the electrical connection port is electrically connected with the piezoelectric material layer, and the electrical connection port is used to be connected with an external device;The external device, the electrical connection port and the piezoelectric material layer form a detection electric circuit.

2. The puncture cannula of claim 1, wherein It also includes a cap head (5) with a built-in vibration motor, and the cap head (5) is detachably connected with the handle (1).

3. The puncture cannula of claim 2, wherein, The penetration end of the puncture needle tube (2) is provided with a sawtooth surface inclined to the radial section of the puncture needle tube (2).

4. The puncture cannula of claim 1, wherein, The metal core layer is a memory alloy core layer.

5. The puncture cannula of claim 1, wherein, It also includes a limiting ring (6), each second support arm (4) is movably connected with the limiting ring (6), and the limiting ring (6) can move along the axis direction of the puncture needle tube (2).

6. The puncture cannula of claim 5, wherein, The limiting ring (6) is provided with a plurality of through holes, and each second support arm (4) passes through a different through hole.

7. The puncture cannula of claim 6, wherein, The side of the second support arm (4) away from the puncture needle tube (2) is provided with a convex arc surface, and the convex arc surface limits the second support arm (4) from leaving the through hole.

8. The puncture cannula of claim 7, wherein, The convex arc surface is provided with at least two, and the arch height and arc diameter of each convex arc surface gradually increase away from the handle (1).

9. The puncture cannula of claim 6, wherein, The handle (1) is connected with the first support arm (3) through a sliding block (7), and the outer wall of the sliding block (7) is movably connected with the inner wall of the limiting ring (6).

Images