Dual-lumen needle

Abstract

Disclosed in the present application is a dual-lumen needle. The dual-lumen needle comprises: a needle hub; a needle body, fixedly disposed on the needle hub; a first channel, extending through the needle hub and the needle body and configured to allow an interventional surgical instrument to pass through; a second channel, extending through the needle hub and the needle body, the second channel and the first channel being independent of each other, and the second channel being configured to allow a navigation sensor to inserted therein; and a limiting joint, configured to control an amount of movement of the interventional surgical instrument along the first channel in an interventional direction, the limiting joint being provided with a clamping groove, and the clamping groove being configured to be clamped onto the interventional surgical instrument. The present application achieves the technical effect of navigating the intervention process of the interventional surgical instrument, which can not only accurately acquire the position of the front end of the interventional surgical instrument in the interventional process, but also facilitate surgical operations, and can also reduce the influence of the front end of the interventional surgical instrument on the navigation sensor and healthy tissue in the surgical process.

Description

Double-lumen needle Technical Field

[0001] This application claims priority to Chinese patent application No. 202411445171.5, filed with the State Intellectual Property Office of China on October 16, 2024, entitled "Double-Cavity Needle", the entire contents of which are incorporated herein by reference. Background Technology

[0002] In related technologies, the primary function of coaxial needles is to create an insertion channel for interventional surgical instruments (such as ablation needles and biopsy needles) and to reach the surgical location under ultrasound guidance. However, this technique cannot achieve precise pinpointing of the target tissue; the spatial position of the needle can only be determined by the strong echo of the needle tip under ultrasound. This not only tests the surgeon's ultrasound skills but also significantly increases the difficulty of the surgery. Summary of the Invention

[0003] The main objective of this application is to provide a double-lumen needle to solve the problem in related technologies where precise positioning of the target tissue is impossible, and the spatial position of the needle can only be determined by the strong echo of the needle tip under ultrasound, which leads to greater surgical difficulty.

[0004] To achieve the above objectives, this application provides a dual-lumen needle, which includes:

[0005] Needle hub;

[0006] The needle body is fixed on the needle holder;

[0007] A first channel extends through the needle hub and the needle body, and the first channel is used for the passage of interventional surgical instruments.

[0008] The second channel passes through the needle hub and the needle body. The second channel is independent of the first channel and is used for the navigation sensor to pass through.

[0009] A limiting connector is provided for detachably engaging with the interventional surgical instrument. The first end of the limiting connector is used to abut against the fixed end of the interventional surgical instrument, and the second end of the limiting connector is used to abut against the needle hub, so as to control the amount of movement of the interventional surgical instrument along the first channel in the interventional direction through the limiting connector.

[0010] Furthermore, the needle body includes a first needle tube and a second needle tube, the first ends of the first needle tube and the second needle tube are both fixed on the needle seat, the second end of the second needle tube does not exceed the second end of the first needle tube, the first channel passes through the needle seat and the first needle tube, and the second channel passes through the needle seat and the second needle tube.

[0011] Furthermore, the second needle tube is located outside the first needle tube and is closely fitted to the first needle tube.

[0012] Furthermore, the tip of the second needle tube does not exceed the tip of the first needle tube, and the tip of the second needle tube is set as a sharp point.

[0013] Furthermore, the second needle tube is located inside the first needle tube.

[0014] Furthermore, the needle socket includes a first interface and a second interface, the first interface corresponding to the first channel and the second interface corresponding to the second channel.

[0015] Furthermore, a hemostatic valve is provided at the end of the needle hub away from the needle body. The hemostatic valve is used to hold the interventional surgical instrument tightly and seal the gap between the rear end of the interventional surgical instrument and the rear end of the first channel.

[0016] Furthermore, the limiting connector is provided with a through groove along the axial direction. The groove includes a snap-in section and a clamping section arranged sequentially along the snap-in direction. The snap-in section is configured with a narrowed structure, and the clamping section is used to fit with the interventional surgical instrument.

[0017] Furthermore, the limiting joint includes a housing and an inner core;

[0018] The inner core is fixed inside the housing, the housing is a rigid structure, the inner core is elastic, the slot is formed on the inner core, and the housing has an elongated opening at the position corresponding to the slot. The first end of the housing is used to abut against the fixed end of the interventional surgical instrument, and the second end of the housing is used to abut against the needle hub.

[0019] Furthermore, the limiting connector also includes a T-shaped component, which is fixed to the side of the housing away from the elongated opening.

[0020] Furthermore, the limiting connector includes two separately arranged limiting blocks, which are arranged opposite to each other and used to fasten and fix the interventional surgical instrument. The first end of the limiting block is used to abut against the fixed end of the interventional surgical instrument, and the second end of the limiting block is used to abut against the needle seat.

[0021] This application also provides a dual-lumen needle, comprising:

[0022] Needle hub;

[0023] The needle body is fixed on the needle holder;

[0024] A first channel extends through the needle hub and the needle body, and the first channel is used for the passage of interventional surgical instruments.

[0025] The second channel passes through the needle hub and the needle body. The second channel is independent of the first channel and is used for the navigation sensor to pass through.

[0026] A limiting connector is provided for detachably engaging with the interventional surgical instrument. The first end of the limiting connector is used to abut against the fixed end of the interventional surgical instrument, and the second end of the limiting connector is used to abut against the needle hub, so as to control the amount of movement of the interventional surgical instrument along the first channel in the interventional direction through the limiting connector.

[0027] The limiting connector includes two separately arranged limiting blocks, which are arranged opposite each other and used to fasten and fix the interventional surgical instrument. The first end of the limiting block is used to abut against the fixed end of the interventional surgical instrument, and the second end of the limiting block is used to abut against the needle seat.

[0028] In this embodiment, a needle hub is provided; a needle body is fixed on the needle hub; a first channel passes through the needle hub and the needle body, and is used for the passage of an interventional surgical instrument; a second channel passes through the needle hub and the needle body, and is independent of the first channel, and is used for the passage of a navigation sensor; and a limiting connector is used to control the amount of movement of the interventional surgical instrument along the first channel in the interventional direction. On the one hand, two independent channels are formed on the needle body, the interventional surgical instrument can be installed in the first channel, and the navigation sensor can be installed in the second channel. After intervention in the human body, the navigation sensor can be used to determine the position of the interventional surgical instrument, thereby achieving the technical effect of navigating the interventional surgical instrument interventional process, enabling the interventional surgical instrument to perform precise point-to-point surgery on the target tissue. This solves the problem in related technologies that cannot perform precise point-to-point surgery on the target tissue, and can only judge the spatial position of the needle by the strong echo of the needle tip under ultrasound, which leads to greater surgical difficulty.

[0029] On the other hand, the extension length of the interventional surgical instrument beyond the first channel can be controlled under the action of the limiting connector. Before reaching the target tissue, the extension length of the interventional surgical instrument beyond the first channel is relatively short or does not extend beyond the first channel, so that the tip of the interventional surgical instrument is closer to the navigation sensor, thereby facilitating accurate acquisition of the position of the tip of the interventional surgical instrument. When approaching the target tissue, the limiting connector is adjusted so that the interventional surgical instrument can further extend beyond the first channel to enter the target tissue for surgical operation. This achieves the technical effect of accurately acquiring the position of the tip of the interventional surgical instrument during the intervention process, facilitating surgical operation, and reducing the impact of the tip of the interventional surgical instrument on the navigation sensor and healthy tissue during the operation. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0031] Figure 1 is a schematic diagram of the connection between the needle body and the needle seat in a double-lumen needle according to an embodiment of this application;

[0032] Figure 2 is a schematic diagram of the structure of the interventional surgical instrument installed on the double-lumen needle according to an embodiment of this application;

[0033] Figure 3 is a schematic diagram of the structure of the limiting joint according to an embodiment of this application;

[0034] Figure 4 is a schematic diagram of a structure with a hemostatic valve installed according to an embodiment of this application;

[0035] Figure 5 is a schematic diagram of the structure after installing the hemostatic valve based on Figure 2;

[0036] Figure 6 is a structural schematic diagram of the limit joint before installation according to an embodiment of this application;

[0037] Figure 7 is a schematic diagram of the structure after the limit joint is installed according to the embodiment of this application;

[0038] Figure 8 is a structural schematic diagram of a surgical procedure performed according to an embodiment of this application;

[0039] Among them, 1 needle hub, 10 first interface, 11 second interface, 2 needle body, 20 first channel, 200 first needle tube, 21 second channel, 210 second needle tube, 3 limiting connector, 30 shell, 31 elongated opening, 32 slot, 320 insertion section, 321 clamping section, 33 inner core, 34 T-shaped piece, 4 interventional surgical instrument, 40 fixed end, 400 needle handle, 41 needle, 5 hemostatic valve. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0041] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein.

[0042] In this application, the terms "upper," "lower," "inner," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily used to better describe this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0043] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0044] Furthermore, the terms "set up," "equipped with," "connected," and "fixed" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] In addition, the term "multiple" should mean two or more.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] To address the related technical problems, as shown in Figures 1 to 5, embodiments of this application provide a dual-lumen needle, which includes:

[0048] Needle hub 1;

[0049] Needle body 2, which is fixed on needle seat 1;

[0050] The first channel 20 passes through the needle hub 1 and the needle body 2, and the first channel 20 is used for the interventional surgical instrument 4 to pass through.

[0051] The second channel 21 passes through the needle holder 1 and the needle body 2. The second channel 21 is independent of the first channel 20. The second channel 21 is used for the navigation sensor to pass through.

[0052] Limiting connector 3 is used to control the amount of movement of the interventional surgical instrument 4 along the first channel 20 in the interventional direction.

[0053] In this embodiment, the double-lumen needle includes a needle base 1 and a needle body 2. The needle body 2 is fixed on the needle base 1. A first channel 20 and a second channel 21 are provided through the needle body 2 and the needle base 1. The first channel 20 and the second channel 21 can be nested or side by side; this embodiment does not impose any restrictions on this. Furthermore, when the needle base 1 and the needle body 2 are two separable parts, the first channel 20 includes a channel located on the needle body 2 and a channel located on the needle base 1. When the needle body 2 and the needle base 1 are connected, the two channels align to form the first channel 20. The second channel 21 is similarly formed and will not be described in detail here.

[0054] The first channel 20 and the second channel 21 constitute the two cavities of the double-lumen needle. The first channel 20 is for the interventional surgical instrument 4 to pass through; in other words, the interventional surgical instrument 4 can enter from the rear end of the first channel 20 and exit from the front end. The second channel 21 is for the navigation sensor to pass through; similarly, the navigation sensor can enter from the rear end of the second channel 21 and extend to the front end. The front end of the second channel 21 should be close to the front end of the first channel 20, so that the navigation sensor can be located close to the front end of the interventional surgical instrument 4, thereby facilitating accurate acquisition of the position of the front end of the interventional surgical instrument 4 during the intervention process.

[0055] According to the structure of the interventional surgical instrument 4, the first channel 20 has a matching structural form. In one embodiment, the interventional surgical instrument 4 may be an ablation needle 41 or a biopsy needle 41, and the corresponding first channel 20 is a cylindrical channel, the size of which matches the size of the interventional surgical instrument 4.

[0056] Based on the structure of the navigation sensor, the second channel 21 also has a matching structure. In one embodiment, the navigation sensor is an electromagnetic navigation sensor, and the second channel 21 should be able to accommodate the electromagnetic navigation sensor and the cable connected to the sensor.

[0057] Before intervention, the interventional surgical instrument 4 is mounted on the double-lumen needle via the first channel 20. The front end of the interventional surgical instrument 4 is close to the front end of the second channel 21. Depending on the surgical procedure, the front end of the interventional surgical instrument 4 may extend beyond the first channel 20 or not. The navigation sensor is mounted on the double-lumen needle via the second channel 21 and is located at the front end of the second channel 21. During the intervention, the interventional surgical instrument 4, the navigation sensor, and the double-lumen needle move synchronously. During this process, the navigation sensor locates the position of the interventional surgical instrument 4, especially the position of its front end. To facilitate the fixation of the navigation sensor, corresponding fixing structures can be provided on the needle holder 1 and the cable portion of the navigation sensor. For example, threads can be provided on the needle holder 1, and a nut can be provided at the end of the cable portion. The navigation sensor is fixed by connecting the nut and the threads.

[0058] As shown in Figures 2 and 5, to maintain the relative position between the interventional surgical instrument 4 and the needle body 2 of the double-lumen needle during the intervention process, the double-lumen needle in this embodiment also includes a limiting connector 3. The limiting connector 3 in this embodiment functions to control the amount of movement of the interventional surgical instrument 4 along the first channel 20 in the interventional direction. Specifically, the limiting connector 3 is detachably snapped onto the interventional surgical instrument 4. The first end of the limiting connector 3 abuts against the fixed end 40 of the interventional surgical instrument 4, and the second end of the limiting connector 3 abuts against the needle seat 1, thereby controlling the amount of movement of the interventional surgical instrument 4 along the first channel 20 in the interventional direction through the limiting connector 3.

[0059] Before performing surgical procedures at the target location, it is desirable that the distance between the tip of the interventional surgical instrument 4 and the navigation sensor be relatively short under the action of the limiting connector 3, thereby facilitating the positioning of the tip of the interventional surgical instrument 4. When it is necessary to perform surgical procedures at the target location, it is desired that the interventional surgical instrument 4 can move forward independently along the first channel 20 and reach the target location to perform the surgical procedures by adjusting the limiting structure.

[0060] Based on the above objectives, the limiting connector 3 can have various structural forms. As shown in Figure 5, in one embodiment, the interventional surgical instrument 4 is an ablation needle. The ablation needle 41 includes a needle 41 and a fixed end 40. In this embodiment, the fixed end 40 can be a needle handle 400 fixed to the rear end of the needle 41. Before the operation, the needle 41 is inserted into the first channel 20. The needle handle 400 is located outside the first channel 20 and maintains a distance from the needle seat 1. The two ends of the limiting connector 3 can respectively abut against the end faces of the needle seat 1 and the needle handle 400. By controlling the length of the first channel 20 and the length of the limiting connector 3, the distance between the front end of the needle 41 and the front end of the first channel 20 can be limited. For the ablation needle 41, the front end of the needle 41 can be limited to extend a short length beyond the first channel 20. After reaching the target position, the limiting connector 3 can be adjusted to disengage it from the needle handle 400. At this time, the needle handle 400 can be pushed to move the needle 41 forward along the first channel 20 to the lesion tissue (target position) for ablation. As for the ablation needle 41, firstly, the double-lumen needle does not enter the lesion tissue during ablation, so the double-lumen needle will not interfere with the ablation process of the ablation needle 41. Secondly, during the ablation process, since the front end of the needle 41 (i.e. the ablation end) is relatively far away from the navigation sensor in the second channel 21, the energy of the ablation end is not likely to affect the navigation sensor.

[0061] In another embodiment of the limiting connector 3, the limiting connector 3 is movably connected to the needle hub 1 (e.g., hinged or sliding connection). Before installing the ablation needle 41, the position of the limiting connector 3 is adjusted to allow installation space for the ablation needle 41. After the needle 41 of the ablation needle 41 is inserted into the first channel 20, the position of the limiting connector 3 can be adjusted again (e.g., rotated or slid out) so that the end of the limiting connector 3 abuts against the needle handle 400 of the ablation needle 41. After approaching the lesion tissue, the position of the limiting connector 3 is adjusted in the opposite direction to allow the ablation needle 41 to move freely to enter the lesion component for ablation.

[0062] It should be noted that the above description of the specific structure and movement of the limiting connector 3 is not restrictive, and those skilled in the art can design it according to actual needs. Similarly, the description of the interventional surgical instrument 4 is not restrictive, and those skilled in the art can also use corresponding double-lumen needles according to actual needs.

[0063] Taking ablation surgery as an example, the interventional surgical instrument 4 is the ablation needle 41. Before preparing for the ablation surgery, the size of the tumor is determined through pre-operative imaging examination, and an ablation needle 41 of appropriate specifications is selected, which is then matched with a suitable double-lumen needle. As shown in Figure 6, the needle 41 of the ablation needle 41 is first inserted into the first channel 20 through the needle seat 1, as shown in Figure 7. Then, the limiting connector 3 is attached to the needle 41, and the handle of the ablation needle 41 is pushed to engage with the limiting connector 3. Then, the navigation sensor is inserted into the second channel 21 through the needle seat 1, and then the nut at one end of the sensor is screwed into the thread on the double-lumen seat to lock the relative position. At this time, the spatial position of the ablation needle 41 can be detected in real time on the positioning navigation device. After the preliminary preparation is completed, the patient's skin to be inserted into the needle 41 is disinfected and broken, and then the matched double-lumen needle and ablation needle 41 are simultaneously punctured into the body. Guided by ultrasound and the navigation system, the double-lumen needle reaches the ablation target tissue. Then remove the limiting connector 3, as shown in Figure 8, and push the ablation needle 41 along the first channel 20 to the tumor or other lesion site for ablation, while the double-lumen needle remains outside the ablated tissue. After ablation is completed, the ablation needle 41 is withdrawn from the body through the double-lumen needle to avoid tumor cell transplantation into the abdominal wall.

[0064] This application achieves two independent channels on the needle body 2. The interventional surgical instrument 4 can be installed in the first channel 20, and the navigation sensor can be installed in the second channel 21, making the interventional surgical instrument 4 and the navigation sensor an integrated unit. The navigation system can identify the spatial position of the interventional surgical instrument 4 in the body in real time. Furthermore, through the setting of the navigation system, the position for the interventional surgical instrument 4 to be inserted forward after the limiting connector 3 is removed can be reserved. Thus, before the interventional surgical instrument 4 enters the target position, the actual position to be reached can be seen, making the surgical operation more precise and simple.

[0065] On the other hand, the length of the interventional surgical instrument 4 extending out of the first channel 20 can be controlled under the action of the limiting connector 3. Before reaching the target tissue, the length of the interventional surgical instrument 4 extending out of the first channel 20 is relatively short or does not extend out of the first channel 20, so that the front end of the interventional surgical instrument 4 is closer to the navigation sensor, thereby facilitating the accurate acquisition of the position of the front end of the interventional surgical instrument 4. When approaching the target tissue, the limiting connector 3 is adjusted so that the interventional surgical instrument 4 can further extend out of the first channel 20 to enter the target tissue for surgical operation. Thus, the technical effect of accurately acquiring the position of the front end of the interventional surgical instrument 4 during the intervention process is achieved, which also facilitates the surgical operation and reduces the impact of the front end of the interventional surgical instrument 4 on the navigation sensor and healthy tissue during the operation.

[0066] As shown in Figure 1, in order to have mutually independent first channels 20 and second channels 21 inside the needle body 2, in one embodiment the needle body 2 includes a hollow first needle tube 200 and second needle tube 210. The first needle tube 200 and the second needle tube 210 are arranged side by side or inner and outer sleeves. The first needle tube 200 and the second needle tube 210 can be welded or glued to fix them. The first ends of the first needle tube 200 and the second needle tube 210 are both fixed on the needle seat 1. The second end of the second needle tube 210 does not exceed the second end of the first needle tube 200. The first channel 20 passes through the needle seat 1 and the first needle tube 200, and the second channel 21 passes through the needle seat 1 and the second needle tube 210.

[0067] Specifically, in this embodiment, the hollow cavity inside the first needle tube 200 forms part of the first channel 20, and the other part of the first channel 20 is located on the needle holder 1. The hollow cavity inside the second needle tube 210 forms part of the second channel 21, and the other part of the second channel 21 is located on the needle holder 1. In one embodiment, the diameter of the first needle tube 200 is larger than the diameter of the second needle tube 210. The first needle tube 200 is used for the ablation needle 41 to be inserted, and the second needle tube 210 is used for the electromagnetic navigation sensor to be inserted.

[0068] To accurately position the interventional surgical instrument 4 inserted within the first needle tube 200, and to avoid the interventional surgical instrument 4 affecting the navigation sensor during surgical procedures, in this embodiment, the tip of the second needle tube 210 does not extend beyond the tip of the first needle tube 200. In other words, the tip of the second needle tube 210 may be flush with or shorter than the tip of the first needle tube 200. As a preferred embodiment, the tip of the second needle tube 210 is preferably shorter than the tip of the first needle tube 200, with a distance of 1-5 mm between the two ends.

[0069] When the needle body 2 includes a hollow first needle tube 200 and a second needle tube 210, the first needle tube 200 and the second needle tube 210 are arranged side by side or in an inner and outer sleeve arrangement. When the second needle tube 210 is sleeved inside the first needle tube 200, taking both the first needle tube 200 and the second needle tube 210 as cylindrical hollow tubes and the interventional surgical instrument 4 as an ablation needle 41 as an example, the ablation needle 41 is generally cylindrical in shape. After the first needle tube 200 and the second needle tube 210 are sleeved, the space between the two needle tubes 200 and 210 needs to accommodate the insertion of the cylindrical ablation needle 41, which will result in a large amount of wasted space between the two needle tubes. Under size constraints, the diameter of the second needle tube 210 will be relatively larger, resulting in an increase in the diameter of the entire double-lumen needle.

[0070] Therefore, to improve space utilization and control the overall size of the dual-lumen needle within a reasonable range, as shown in Figure 1, in this embodiment, the second needle tube 210 is preferably arranged side-by-side outside the first needle tube 200. In this embodiment, the diameter of the first needle tube 200 can be matched with the ablation needle 41, so that there is no wasted space inside the first needle tube 200. Similarly, the diameter of the second needle tube 210 can also be matched with the navigation sensor.

[0071] In some surgical procedures, the tip of the second needle tube 210 needs to be punctured. Therefore, in order to facilitate puncture, the second end of the second needle tube 210 in this embodiment is a pointed tip.

[0072] Since a portion of the first channel 20 and the second channel 21 are located inside the needle holder 1, the interventional surgical instrument 4 and the navigation sensor both need to pass through the corresponding channels from the needle holder 1. Therefore, as shown in Figure 1, the needle holder 1 in this embodiment includes a first interface 10 and a second interface 11. The first interface 10 corresponds to the first channel 20, and the second interface 11 corresponds to the second channel 21.

[0073] In one embodiment, the first interface 10 and the second interface 11 can be side-by-side interfaces with their axes parallel. Although this structure can meet the insertion requirements of the interventional surgical instrument 4 and the navigation sensor, the interventional double-lumen needle is prone to interference with the cable portion of the navigation sensor because the interventional surgical instrument 4 needs to be pushed forward during the surgical procedure.

[0074] In another embodiment, as shown in Figure 1, the needle holder 1 is configured with a Y-shaped structure, including a straight section and an inclined section. A first interface 10 is located on the straight section and corresponds to a first channel 20, with the first interface 10 and the first channel 20 coaxial. A second interface 11 is located on the inclined section, and the portion of the second channel 21 within the needle holder 1 is bent to connect the second interface 11 and the second needle tube 210. In this embodiment, the position of the second interface 11 is offset from the position of the first interface 10, ensuring that the movement of the interventional surgical instrument 4 does not interfere with the navigation sensor.

[0075] Since the interventional surgical instrument 4 is inserted into the first channel 20, there will be a certain gap between the interventional surgical instrument 4 and the first channel 20. In order to prevent blood from flowing out from the end of the double-lumen needle through this gap during the operation, as shown in Figure 4, a hemostatic valve 5 is provided at the end of the needle seat 1 away from the needle body 2 in this embodiment. The hemostatic valve 5 is used to hold the interventional surgical instrument 4 tightly and block the gap between the rear end of the interventional surgical instrument 4 and the rear end of the first channel 20.

[0076] In this embodiment, the hemostatic valve 5 is a rotary hemostatic valve, comprising a screw head, a friction-reducing pad, and silicone. The screw head is mounted on the needle seat 1. By rotating the screw head, the silicone is compressed and deformed, causing the silicone to tightly grip the ablation needle 41, thereby achieving the function of isolating blood. In this embodiment, the use of the rotary hemostatic valve 5 can prevent tissue blood from leaking out of the body through gaps during puncture or surgery.

[0077] In this application, the limiting connector 3 functions to control the amount of movement of the interventional surgical instrument 4 along the first channel 20 in the interventional direction. In one embodiment of the limiting connector 3, the limiting connector 3 is used to be detachably snapped onto the interventional surgical instrument 4, the first end of the limiting connector 3 is used to abut against the fixed end 40 of the interventional surgical instrument 4, and the second end of the limiting connector 3 is used to abut against the needle hub 1.

[0078] Specifically, in this embodiment, taking the ablation needle 41 as an example of the interventional surgical instrument 4, the limiting connector 3 can be snapped onto the ablation needle 41. After installation, both ends of the limiting connector 3 abut against the needle hub 1 and the needle handle 400 of the ablation needle 41, respectively, thereby fixing the needle 41 within the first channel 20 during the intervention. After approaching the target position, the limiting connector 3 can be removed from the needle 41. At this time, the needle handle 400 can be further pushed to push the front end of the needle 41 out of the first channel 20 to the target position to perform ablation.

[0079] To facilitate the snapping of the limiting connector 3 onto the interventional surgical instrument 4, as shown in Figure 3, the limiting connector 3 in this embodiment is provided with a slot 32 that runs through the axial direction. Furthermore, the slot 32 includes a snapping section 320 and a clamping section 321 arranged sequentially along the snapping direction. The snapping section 320 is configured with a constricted structure, and the clamping section 321 is used to fit against the interventional surgical instrument 4.

[0080] In this embodiment, the snap-fit ​​section 320 with its constricted structure facilitates the insertion of the interventional surgical instrument 4 (e.g., the needle 41 of the ablation needle 41), while the clamping section 321 provides better gripping of the interventional surgical instrument 4. In this embodiment, the constriction direction of the snap-fit ​​section 320 faces the clamping section 321, and the diameter of the clamping section 321 is larger than the minimum opening size of the snap-fit ​​section 320, thereby ensuring that the clamping section 321 grips the interventional surgical instrument 4 and the limiting connector 3 will not fall off.

[0081] Based on the above embodiments, in order to further facilitate the installation and use of the limiting connector 3, the limiting connector 3 in this embodiment includes a housing 30 and an inner core 33; the inner core 33 is fixed inside the housing 30, the housing 30 is set as a rigid structure, the inner core 33 is elastic, the slot 32 is opened on the inner core 33, and the housing 30 is provided with an elongated opening 31 at the position corresponding to the slot 32. The first end of the housing 30 is used to abut against the fixed end 40 of the interventional surgical instrument 4, and the second end of the housing 30 is used to abut against the needle seat 1.

[0082] Specifically, in this embodiment, the limiting connector 3 includes two parts: a rigid housing 30 and an elastic inner core 33. The rigid housing 30 ensures sufficient structural strength for the limiting connector 3. When limiting the interventional surgical instrument 4, both ends of the rigid housing 30 abut against the needle hub 1 and the fixed end 40 of the interventional surgical instrument 4, respectively. During installation, because the inner core 33 has a certain degree of elasticity and the slot 32 is formed on the inner core 33, the inner core 33 can undergo a certain amount of deformation during installation, thereby allowing the slot 32 to be more tightly engaged with the interventional surgical instrument 4. In one embodiment, the inner core 33 may be made of rubber.

[0083] To facilitate the installation and disassembly of the limiting connector 3, as shown in Figure 3, the limiting connector 3 in this embodiment also includes a T-shaped member 34. The T-shaped member 34 is fixed to the side of the housing 30 away from the elongated opening 31, and the limiting connector 3 can be easily disassembled manually using the T-shaped member 34. It is understood that, in addition to providing the T-shaped member 34, other structures can also be used, and this embodiment does not impose any restrictions on them.

[0084] In another embodiment of the limiting connector 3, the limiting connector 3 includes two separately arranged limiting blocks. The two limiting blocks are arranged opposite each other and used to fasten and fix them on the interventional surgical instrument 4. The first end of the limiting block is used to abut against the fixed end 40 of the interventional surgical instrument 4, and the second end of the limiting block is used to abut against the needle seat 1.

[0085] Specifically, in this embodiment, the inner side of the limiting block has an arc-shaped groove, which can be tightly held onto the interventional surgical instrument 4 during installation. The two limiting blocks can be locked together by a specific locking structure, such as buckles that can be snapped together on the two limiting blocks, or bolts that can play a locking role, etc. This embodiment does not impose any restrictions on this.

[0086] Based on the above embodiments, in order to better clamp and fix the limiting block on the interventional surgical instrument 4, the limiting block includes an arc-shaped rigid outer shell and a flexible core, with an arc-shaped groove formed on the flexible core. The flexible core can be made of rubber, and its own elastic deformation can better clamp the interventional surgical instrument 4.

[0087] In the embodiment where the limiting block is set to two pieces, installation and disassembly are inconvenient because the corresponding snap-fit ​​structure needs to be operated during installation and disassembly. A preferred embodiment is one in which a slot 32 extending axially through the limiting joint 3 is provided.

[0088] This application also provides a specific implementation of an electromagnetically-guided puncture system, including the dual-lumen needle, the second electromagnetic navigation sensor, and the navigation device described in the above embodiments. In use, the second electromagnetic navigation sensor is fixed to an ultrasound probe, which can be a surface probe or an intraoperative probe; there is no limitation on the type of ultrasound probe. The navigation device is configured to extract the electromagnetic signals from the navigation sensor and the second electromagnetic navigation sensor on the dual-lumen needle, and determine the spatial relationship between the dual-lumen needle and the ultrasound probe based on the electromagnetic signals.

[0089] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A dual lumen needle characterized by, include: Needle hub; The needle body is fixed on the needle holder; A first channel extends through the needle hub and the needle body, and the first channel is used for the passage of interventional surgical instruments. The second channel passes through the needle hub and the needle body. The second channel is independent of the first channel and is used for the navigation sensor to pass through. A limiting connector is provided for detachably engaging with the interventional surgical instrument. The first end of the limiting connector is used to abut against the fixed end of the interventional surgical instrument, and the second end of the limiting connector is used to abut against the needle hub, so as to control the amount of movement of the interventional surgical instrument along the first channel in the interventional direction through the limiting connector. The limiting connector is provided with a slot, which is used to engage with an interventional surgical instrument.

2. The dual lumen needle of claim 1, wherein, The needle body includes a first needle tube and a second needle tube. The first ends of the first needle tube and the second needle tube are both fixed on the needle seat. The second end of the second needle tube does not exceed the second end of the first needle tube. The first channel passes through the needle seat and the first needle tube, and the second channel passes through the needle seat and the second needle tube.

3. The dual lumen needle of claim 2, wherein, The second needle tube is located outside the first needle tube and is closely fitted to the first needle tube.

4. The dual lumen needle of claim 1, wherein, The needle hub includes a first interface and a second interface, wherein the first interface corresponds to the first channel and the second interface corresponds to the second channel.

5. The dual lumen needle of claim 1, wherein, A hemostatic valve is provided at the end of the needle hub away from the needle body. The hemostatic valve is used to hold the interventional surgical instrument tightly and seal the gap between the rear end of the interventional surgical instrument and the rear end of the first channel.

6. The dual lumen needle of claim 2, wherein, The tip of the second needle tube does not extend beyond the tip of the first needle tube, and the tip of the second needle tube is set as a sharp point.

7. The dual lumen needle of claim 1, wherein, The slot extends through the axial direction of the limiting joint. The slot includes a snap-in section and a clamping section arranged sequentially along the snap-in direction. The snap-in section is configured with a constricted structure, and the clamping section is used to fit with the interventional surgical instrument.

8. The dual lumen needle of claim 7, wherein, The limiting joint includes a housing and an inner core; The inner core is fixed inside the housing, the housing is a rigid structure, the inner core is elastic, the slot is formed on the inner core, and the housing has an elongated opening at the position corresponding to the slot. The first end of the housing is used to abut against the fixed end of the interventional surgical instrument, and the second end of the housing is used to abut against the needle hub.

9. The dual lumen needle of claim 8, wherein, The limiting connector also includes a T-shaped component, which is fixed to the side of the housing away from the elongated opening.

10. A dual lumen needle characterized by, include: Needle hub; The needle body is fixed on the needle holder; A first channel extends through the needle hub and the needle body, and the first channel is used for the passage of interventional surgical instruments. The second channel passes through the needle hub and the needle body. The second channel is independent of the first channel and is used for the navigation sensor to pass through. A limiting connector is provided for detachably engaging with the interventional surgical instrument. The first end of the limiting connector is used to abut against the fixed end of the interventional surgical instrument, and the second end of the limiting connector is used to abut against the needle hub, so as to control the amount of movement of the interventional surgical instrument along the first channel in the interventional direction through the limiting connector. The limiting connector includes two separately arranged limiting blocks, which are arranged opposite each other and used to fasten and fix the interventional surgical instrument. The first end of the limiting block is used to abut against the fixed end of the interventional surgical instrument, and the second end of the limiting block is used to abut against the needle seat.

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