Puncture cannula holder

Abstract

The utility model relates to a kind of puncture cannula fixer, including fixed seat, with the support of the fixed seat, with the support of the helical spring, the adjacent two spring rings of the helical spring are held puncture cannula.The utility model under the joint action of fixed seat and support, so that helical spring can be fixed in the specific position of human skin surface.Helical spring is firmly held by the clamping force between its adjacent two spring rings, realizes puncture cannula stable fixation, not easy to shake, and different diameter puncture cannula can be held.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, and in particular to a puncture cannula fixation device. Background Technology

[0002] Radiofrequency ablation (RFA) is a minimally invasive interventional treatment technique that uses the heat generated by high-frequency current to precisely destroy abnormal lesions or block abnormal nerve signal transmission, thereby achieving the therapeutic goal.

[0003] During radiofrequency ablation, a trocar is typically used to create a channel to accommodate the radiofrequency ablation electrode. Before the electrode is inserted into the trocar, it is secured to prevent displacement, and the distal end of the trocar is confirmed to have reached and is pointing towards the target tissue or nerve using equipment such as CT, X-ray, or ultrasound.

[0004] However, current clinical methods for securing trocar cannulas are relatively limited, typically relying solely on medical tape. The effectiveness of using medical tape to secure trocar cannulas is inconsistent, influenced by the surgeon's experience, the patient's skin condition, and their musculoskeletal morphology. This method depends entirely on the tape's own support for fixation. During radiofrequency ablation, even slight movements of the patient can cause the trocar to shift, affecting the surgical outcome. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model discloses a puncture cannula fixator to achieve stable fixation of the puncture cannula and the surgical patient.

[0006] The objective of this utility model is achieved through the following technical solution: A puncture cannula fixation device includes a fixing base, a support member connected to the fixing base, and a helical spring connected to the support member, wherein the puncture cannula is clamped between two adjacent spring coils of the helical spring.

[0007] Furthermore, each of the two adjacent spring coils in the helical spring is provided with a recessed groove, and the recessed grooves on the two adjacent spring coils are arranged opposite each other to form a receiving area, which receives the puncture cannula; the depth of the recessed groove is less than the radius of the puncture cannula.

[0008] Furthermore, the inner wall of the recessed groove is provided with an anti-slip coating.

[0009] Furthermore, the fixing seat has a cavity inside, and the fixing seat has an opening at the end away from the support member, and the cavity is connected to the opening; the side wall of the fixing seat is provided with a negative pressure exhaust port connected to the cavity.

[0010] Furthermore, the fixing seat has an adhesive layer on the outer wall surrounding the opening.

[0011] Furthermore, the fixing base is cone-shaped, and the support member is disposed at the cone tip of the fixing base.

[0012] Furthermore, the support member is rod-shaped and integrally formed with the helical spring.

[0013] Furthermore, the fixing base and the support member are integrally injection molded.

[0014] Furthermore, the helical spring is a shape memory alloy spring.

[0015] Furthermore, the support member is a snake-bone rod or a telescopic rod.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: Under the combined action of the fixing base and the support, the helical spring can be fixed at a specific position on the surface of human skin. The helical spring, through the clamping force between its two adjacent spring coils, firmly holds the puncture cannula, achieving stable fixation of the puncture cannula, preventing it from shaking, and can hold puncture cannulas of different diameters. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the puncture cannula fixator of this utility model when it is used in conjunction with the puncture cannula; Figure 2 This is a schematic diagram of the puncture cannula fixation device of this utility model; Figure 3 Figure 2 Enlarged schematic diagram of part A in the middle.

[0018] In the picture: 1-Fixed base; 2-Support; 3-Helical spring; 4-Piercing sleeve; 5-Groove; 6-Opening; 7-Negative pressure suction port. Detailed Implementation

[0019] The technical solution of this utility model 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 this utility model. 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.

[0020] 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.

[0021] 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. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0022] This utility model addresses the problem of insecure fixation of puncture cannulas by designing a puncture cannula fixator. For example... Figure 1 As shown, the puncture cannula fixator includes a fixation base 1, a support member 2 connected to the fixation base 1, and a helical spring 3 connected to the support member 2. The puncture cannula 4 is clamped between two adjacent spring coils of the helical spring 3, and the fixation base 1 is used to fix it to the skin. During radiofrequency ablation surgery, the puncture cannula 4 is first inserted into the human body. Then, using the puncture cannula fixator of this invention, external force is used to widen the gap between two adjacent spring coils in the helical spring 3. After the puncture cannula 4 enters the gap between the spring coils, the external force is removed, and the puncture cannula 4 is firmly clamped by the elastic force of the helical spring 3. Subsequently, the fixation base 1 is fixed to the patient's skin surface. Under the combined action of the fixation base 1 and the support member 2, the helical spring can be fixed at a specific position on the human skin surface. The helical spring 3 firmly clamps the puncture cannula 4 through the clamping force between its two adjacent spring coils, achieving stable fixation of the puncture cannula 4, preventing it from shaking, and can clamp puncture cannulas of different diameters.

[0023] In the puncture cannula fixation device of this utility model, many technical features, such as the detailed structure of the helical spring 3 and the detailed structure of the fixing base 1, have multiple implementations. Below, for each of these technical features, one implementation is selected for detailed description, and the embodiment in which this implementation is located is referred to as this embodiment. Other implementations of the helical spring 3 and other features are referred to as other embodiments, which are briefly described below.

[0024] In this embodiment, as Figure 2 and Figure 3 As shown, to make the clamping effect of the helical spring 3 on the puncture sleeve 4 more stable, this invention designs a recessed groove 5 on each of the two adjacent spring coils of the helical spring 3. The recessed grooves 5 on the two adjacent spring coils are arranged opposite each other to form a receiving area, which accommodates the puncture sleeve 4, and the depth of the recessed groove 5 is less than the radius of the puncture sleeve 4. The recessed groove 5 is usually designed as an arc-shaped groove, and the receiving area is set as a cylinder with a diameter smaller than the diameter of the puncture sleeve 4. With the setting of the recessed groove 5, the puncture sleeve 4 is clamped by the helical spring 3, and the puncture sleeve 4 is located in the recessed groove 5, making it difficult for the puncture sleeve 4 to move relative to the helical spring 3. In other embodiments, although the setting of the recessed groove 5 achieves stable clamping of the puncture sleeve 4 and makes it difficult for it to move, it also limits the clamping angle of the puncture sleeve 4 relative to the helical spring 3. In this case, the puncture sleeve 4 can only be set along the axial direction of the recessed groove 5, which increases the difficulty of clamping the puncture sleeve 4 with the helical spring 3. Therefore, to ensure that the puncture cannula 4 can be clamped at multiple angles, the helical spring may not have a recessed groove 5, but instead a sheet-like opening plate. When it is necessary to pull apart two adjacent spring coils in the helical spring 3, the opening plate is inserted into the gap between the two spring coils, and then the opening plate is rotated 90 degrees. With the support of the opening plate, it is easy for the puncture cannula 4 to enter the gap between the two spring coils. Alternatively, the opening plate may not be provided, and the helical spring 3 can be pulled apart by hand. Meanwhile, in other embodiments, the helical spring 3 may also be a shape memory alloy spring. Before using the puncture cannula fixator of this utility model, the helical spring 3 is placed in ice water. At this time, the gap between each spring coil of the helical spring 3 increases, and the puncture cannula 4 can easily pass through the gap between adjacent spring coils. As the helical spring 3 is taken out of the ice water, under the influence of room temperature (room temperature is much higher than ice water temperature), the gap between adjacent spring coils in the helical spring 3 gradually decreases, thereby achieving clamping of the puncture cannula 4.

[0025] In this embodiment, as Figure 2 and Figure 3As shown, the inner wall of the recessed groove 5 is provided with an anti-slip coating. Through the provision of this anti-slip coating, when the helical spring 3 clamps the puncture tube 4, since the puncture tube 4 is located in the recessed groove 5, it may move along its axial direction. However, due to the anti-slip coating on the inner wall of the recessed groove 5, the puncture tube 4 is difficult to move along its axial direction, further achieving stable clamping of the puncture tube 4. In other embodiments, the inner wall surface of the recessed groove 5 can be changed to a frosted surface.

[0026] In this embodiment, as Figure 1 As shown, the fixation base 1 has a cavity, and an opening 6 is provided at the end of the fixation base 1 away from the support member 2, with the cavity communicating with the opening 6. A negative pressure suction port 7, communicating with the cavity, is provided on the side wall of the fixation base 1. When the puncture cannula fixator of this utility model is used, the fixation base 1 needs to be fixed to the surface of the surgical patient's skin. Therefore, during the operation, the surgeon holds the fixation base 1, then aligns the opening 6 with the skin. After the fixation base 1 is in contact with the skin, the gas in the cavity is extracted through the negative pressure suction port 7, creating a negative pressure state inside the cavity, allowing the fixation base 1 to firmly adhere to the human skin. In other embodiments, a strap can also be provided on the fixation base 1 to bind the fixation base 1 to the human body.

[0027] In this embodiment, as Figure 1 As shown, the fixing base 1 has an adhesive layer on its outer wall surrounding the opening 6. The adhesive layer can be in the form of double-sided adhesive. Before use of the puncture cannula fixator of this invention, the adhesive layer includes an adhesive layer adhered to the fixing base 1 and release paper located on the adhesive layer, with the release paper positioned on the side of the adhesive layer away from the fixing base 1. When the puncture cannula fixator is used, the release paper is removed, and the adhesive layer is used to adhere to the surface of the human skin. This invention, through the adhesive layer, allows the fixing base 1 to be pre-fixed to the skin surface when gas is extracted from the cavity of the fixing base 1. When negative pressure is applied inside the cavity, the adhesive layer also helps to fix the fixing base 1 to the skin. In other embodiments, medical tape can also be used to adhere the fixing base 1 to the skin surface.

[0028] In this embodiment, as Figure 1 As shown, the fixation base 1 is conical in shape, and the support member 2 is disposed at the tip of the cone-shaped fixation base 1. By making the fixation base 1 conical, this invention provides a larger contact surface with the patient's skin, which facilitates stable fixation of the fixation base 1 to the skin. In other embodiments, the fixation base 1 can also be cylindrical.

[0029] In this embodiment, as Figure 1As shown, the support member 2 is rod-shaped and integrally formed with the helical spring 3. In the production process of this utility model's puncture cannula fixator, a thin metal wire can be used to make the support member 2 and the helical spring 3. During the processing of the metal wire, a portion of the wire is processed into the helical spring 3, while the remaining wire remains unprocessed to form the support member 2. The metal wire can be aluminum wire. Since the puncture cannula 4 is relatively light, the support member 2 formed by the remaining aluminum wire provides support for the puncture cannula 4, and the support member 2 can be bent freely by hand, thus facilitating the fixation of the puncture cannula 4 to the surface of the human skin. This utility model, by setting the support member 2 and the helical spring 3 to be integrally formed, facilitates the production of the puncture cannula fixator. In other embodiments, to improve the stability of the support member 2 and make it difficult for the support member 2 to have high rigidity, the radial cross-sectional area of ​​the support member 2 can be much larger than the radial cross-sectional area of ​​the metal wire forming the helical spring 3. In this case, the support member 2 and the helical spring 3 are welded together. Although the support member 2 is difficult to bend, it has strong supporting force, making it difficult for the helical spring 3 to wobble. Meanwhile, in other embodiments, the fixing base 1 and the support member 2 can be injection molded as a single unit. Furthermore, in other embodiments, the fixing base 1, the support member 2, and the helical spring 3 are all molded independently. The support member 2 is a snake-bone rod or a telescopic rod, thus providing strong support while also exhibiting high flexibility, allowing for free adjustment and facilitating the helical spring 3's clamping of the piercing sleeve 4.

[0030] In summary, the puncture cannula fixator of this utility model achieves stable clamping of the puncture cannula 4 through the arrangement of the helical spring 3. The recessed groove 5 prevents the puncture cannula 4 from moving after being clamped by the spring coil. The anti-slip coating further ensures stable clamping of the puncture cannula 4. The negative pressure suction port 7 facilitates the adhesion of the fixation seat 1 to the skin surface. The adhesive layer facilitates the extraction of gas from the cavity and helps fix the fixation seat 1 to the skin. The conical shape of the fixation seat 1 promotes stable fixation to the skin. The integral molding of the support member 2 and the helical spring 3 facilitates the production of the puncture cannula fixator.

[0031] It should be emphasized that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Images