Double-lumen needle

Abstract

The present invention discloses a double-chamber needle, which includes: a needle seat; a needle body, which is fixed on the needle seat; a first channel, which runs through the needle seat and the needle body, and is used for the interventional surgical instrument to pass through; a second channel, which runs through the needle seat and the needle body, and is independent of the first channel, and is used for the navigation sensor to penetrate; a limit joint, and the limit joint is used to control the movement of the interventional surgical instrument along the first channel in the intervention direction. The present invention realizes the technical effect of navigating the intervention process of the interventional surgical instrument, and can not only accurately obtain the position of the front end of the interventional surgical instrument during the intervention process, but also facilitate the surgical operation, and can also reduce the impact of the front end of the interventional surgical instrument on the navigation sensor and healthy tissue during the operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a double-lumen needle. Background Art

[0002] In related technologies, the main function of coaxial needles is to create an entry channel for interventional surgical instruments (such as ablation needles and biopsy needles) and reach the surgical site under ultrasound guidance. However, this technology cannot achieve precise positioning of the target tissue, and can only determine the spatial position of the needle through 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 operation. Summary of the invention

[0003] The main purpose of the present invention is to provide a double-lumen needle to solve the problem in the related art that it is impossible to perform precise positioning surgery on the target tissue, 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 difficulty in surgery.

[0004] In order to achieve the above object, the present invention provides a double-lumen needle, which comprises:

[0005] Needle holder;

[0006] A needle body, wherein the needle body is fixed on the needle seat;

[0007] a first channel, the first channel running through the needle seat and the needle body, the first channel being used for allowing an interventional surgical instrument to pass through;

[0008] a second channel, the second channel running through the needle seat and the needle body, the second channel being independent of the first channel, and the second channel being used for allowing a navigation sensor to penetrate;

[0009] A limit joint, wherein the limit joint is used to be detachably clamped on the interventional surgical instrument, the first end of the limit joint is used to abut against the fixed end of the interventional surgical instrument, and the second end of the limit joint is used to abut against the needle seat, so as to control the movement of the interventional surgical instrument along the first channel in the intervention direction through the limit joint.

[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 runs through the needle seat and the first needle tube, and the second channel runs through the needle seat and the second needle tube.

[0011] Furthermore, the second needle tube is arranged outside the first needle tube and fits tightly with the first needle tube.

[0012] Furthermore, the front end of the second needle tube does not exceed the front end of the first needle tube, and the front end of the second needle tube is configured as a pointed end.

[0013] Furthermore, the second needle tube is arranged in the first needle tube.

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

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

[0016] Furthermore, the limiting joint is provided with a slot extending axially therethrough, the slot comprising a snap-in section and a clamping section sequentially arranged along the snap-in direction, the snap-in section is provided as a shrinking structure, and the clamping section is used to fit with the interventional surgical instrument.

[0017] Furthermore, the limit joint includes a shell and an inner core;

[0018] The inner core is fixed in the shell, the shell is set as a rigid structure, the inner core is elastic, the slot is opened on the inner core, the shell is provided with a long strip opening at a position corresponding to the slot, the first end of the shell is used to abut against the fixed end of the interventional surgical instrument, and the second end of the shell is used to abut against the needle seat.

[0019] Furthermore, the limiting joint also includes a T-shaped piece, and the T-shaped piece is fixed on a side of the shell away from the elongated opening.

[0020] Furthermore, the limit joint includes two separately arranged limit blocks, which are arranged opposite to each other and used to be snap-fitted and fixed on the interventional surgical instrument, the first end of the limit block is used to abut against the fixed end of the interventional surgical instrument, and the second end of the limit block is used to abut against the needle seat.

[0021] In the embodiment of the present invention, a needle seat is provided; a needle body, the needle body is fixed on the needle seat; a first channel, the first channel runs through the needle seat and the needle body, the first channel is used for the interventional surgical instrument to pass through; a second channel, the second channel runs through the needle seat and the needle body, the second channel is independent of the first channel, and the second channel is used for the navigation sensor to penetrate; a limit joint, the limit joint is used to control the movement of the interventional surgical instrument along the first channel in the intervention 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, the navigation sensor can be installed in the second channel, and the position of the interventional surgical instrument can be determined by using the navigation sensor after intervention in the human body, thereby achieving the technical effect of navigating the intervention process of the interventional surgical instrument, so that the interventional surgical instrument can perform precise positioning surgery on the target tissue, thereby solving the problem that the target tissue cannot be precisely positioned in the related art, and the spatial position of the needle can only be judged by the strong echo of the needle tip under ultrasound, which leads to greater difficulty in surgery;

[0022] On the other hand, the length of the interventional surgical instrument extending out of the first channel can be controlled under the action of the limit joint. Before reaching the target tissue, the interventional surgical instrument extends out of the first channel for a shorter length or does not extend out of the first channel, so that the front end of the interventional surgical instrument is closer to the navigation sensor, thereby facilitating accurate acquisition of the position of the front end of the interventional surgical instrument. When approaching the target tissue, the limit joint is adjusted to allow the interventional surgical instrument to further extend out of the first channel to enter the target tissue for surgical operation, thereby achieving the technical effect of accurately acquiring the position of the front end of the interventional surgical instrument during the intervention process, facilitating surgical operation, and reducing the impact of the front end of the interventional surgical instrument on the navigation sensor and healthy tissue during the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention, so that other features, purposes and advantages of the present invention become more obvious. The accompanying drawings of the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 is a schematic structural diagram of the connection between the needle body and the needle seat in the double-lumen needle according to an embodiment of the present invention;

[0025] Figure 2 is a schematic diagram of the structure of an interventional surgical instrument installed on a double-lumen needle according to an embodiment of the present invention;

[0026] Figure 3 is a schematic structural diagram of a limit joint according to an embodiment of the present invention;

[0027] Figure 4is a schematic diagram of a structure in which a hemostatic valve is installed according to an embodiment of the present invention;

[0028] Figure 5 is Figure 2 A schematic diagram of the structure after the hemostatic valve is installed on the basis;

[0029] Figure 6 is a schematic diagram of the structure before the limit joint is installed according to an embodiment of the present invention;

[0030] Figure 7 is a schematic diagram of the structure after the limit joint is installed according to an embodiment of the present invention;

[0031] Figure 8 is a schematic structural diagram of a surgical operation performed according to an embodiment of the present invention;

[0032] Among them, 1 needle seat, 10 first interface, 11 second interface, 2 needle body, 20 first channel, 200 first needle tube, 21 second channel, 210 second needle tube, 3 limit joint, 30 shell, 31 long strip opening, 32 card slot, 320 card-in 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 DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged under appropriate circumstances to facilitate the embodiments of the present invention described herein.

[0035] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "inner", etc. are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0036] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0037] In addition, the terms "disposed", "provided with", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" 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, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the term "plurality" shall mean two or more.

[0039] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0040] To solve relevant technical problems, such as Figures 1 to 5 As shown, an embodiment of the present invention provides a double-chamber needle, the double-chamber needle comprising:

[0041] Needle seat 1;

[0042] The needle body 2 is fixed on the needle seat 1;

[0043] A first channel 20, the first channel 20 runs through the needle seat 1 and the needle body 2, and the first channel 20 is used for the interventional surgical instrument 4 to pass through;

[0044] A second channel 21, the second channel 21 runs through the needle seat 1 and the needle body 2, the second channel 21 and the first channel 20 are independent of each other, and the second channel 21 is used for the navigation sensor to penetrate;

[0045] The limit joint 3 is used to control the movement of the interventional surgical instrument 4 along the first channel 20 in the intervention direction.

[0046] In this embodiment, the double-chamber needle includes a needle seat 1 and a needle body 2. The needle body 2 is fixed on the needle seat 1. A first channel 20 and a second channel 21 are provided in the needle body 2 and the needle seat 1. The first channel 20 and the second channel 21 can be mutually nested or side by side, and this is not limited in this embodiment. In addition, when the needle seat 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 seat 1. When the needle body 2 and the needle seat 1 are connected, the two channels are connected to form the first channel 20. The second channel 21 is the same, and no further description is given here.

[0047] The first channel 20 and the second channel 21 constitute two cavities of the double-lumen needle, wherein the first channel 20 is used for the interventional surgical instrument 4 to pass through, in other words, the interventional surgical instrument 4 can pass through from the rear end of the first channel 20 and pass through from the front end of the first channel 20. The second channel 21 is used for the navigation sensor to pass through, and similarly, the navigation sensor can pass through from the rear end of the second channel 21 and extend to the front end of the second channel 21. 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 the accurate acquisition of the position of the front end of the interventional surgical instrument 4 during the intervention process.

[0048] The first channel 20 has a matching structure according to the structure of the interventional surgical instrument 4. 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, and the size of the channel matches the size of the interventional surgical instrument 4.

[0049] According to 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 a cable connected to the sensor.

[0050] Before intervention in the human body, the interventional surgical instrument 4 is installed on the double-chamber needle through the first channel 20, and the front end of the interventional surgical instrument 4 is close to the front end of the second channel 21. According to the surgical operation, the front end of the interventional surgical instrument 4 may extend a distance from the first channel 20 or may not extend from the first channel 20. The navigation sensor is installed on the double-chamber needle through the second channel 21 and is located at the front end of the second channel 21. During the intervention process, the interventional surgical instrument 4, the navigation sensor and the double-chamber needle move synchronously, and the position of the interventional surgical instrument 4 is located by the navigation sensor during this process, especially the position of the front end of the interventional surgical instrument 4. In order to facilitate the fixing of the navigation sensor, a corresponding fixing structure can be set on the needle seat 1 and the cable part of the navigation sensor, for example, a thread can be set on the needle seat 1, and a nut can be set at the end of the cable part, and the navigation sensor can be fixed by connecting the nut and the thread.

[0051] like Figure 2 and Figure 5 As shown, in order to keep the relative position between the interventional surgical instrument 4 and the needle body 2 of the double-chamber needle fixed during the intervention process, the double-chamber needle in this embodiment further includes a limit joint 3, and the role of the limit joint 3 in this embodiment is to control the movement amount of the interventional surgical instrument 4 along the first channel 20 in the intervention direction. Specifically, the limit joint 3 is used to be detachably clamped on the interventional surgical instrument 4, the first end of the limit joint 3 is used to abut against the fixed end 40 of the interventional surgical instrument 4, and the second end of the limit joint 3 is used to abut against the needle seat 1, so as to control the movement amount of the interventional surgical instrument 4 along the first channel 20 in the intervention direction through the limit joint 3.

[0052] Before performing a surgical operation on the target position, it is expected that the distance between the front end of the interventional surgical instrument 4 and the navigation sensor is relatively close under the action of the limiting joint 3, so as to facilitate the positioning of the front end of the interventional surgical instrument 4. When it is necessary to perform a surgical operation on the target position, it is expected that the interventional surgical instrument 4 can move forward along the first channel 20 alone and reach the target position to perform the surgical operation by adjusting the limiting structure.

[0053] Based on the above purpose, the limit joint 3 can have a variety of structural forms. Figure 5 As shown, in one embodiment, the interventional surgical instrument 4 is an ablation needle, and 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 penetrates into the first channel 20, the needle handle 400 is located outside the first channel 20 and keeps a distance from the needle seat 1, and the two ends of the limit joint 3 can respectively abut against the end faces of the needle seat 1 and the needle handle 400. The distance between the front end of the needle 41 and the front end of the first channel 20 can be limited by the length control of the first channel 20 and the length control of the limit joint 3. For the ablation needle 41, the front end of the needle 41 can be limited to a short length extending out of the first channel 20. After reaching the target position, the limit joint 3 can be adjusted to be separated 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 diseased tissue (target position) for ablation operation. For the ablation needle 41, firstly, the double-chamber needle does not enter the diseased tissue during ablation, so the double-chamber 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 easy to affect the navigation sensor.

[0054] In another embodiment of the limiting joint 3, the limiting joint 3 can be movably connected to the needle seat 1 (for example, hinged or slidably connected), and the position of the limiting joint 3 is adjusted before installing the ablation needle 41 to make room for the installation of the ablation needle 41. After the needle 41 of the ablation needle 41 is installed in the first channel 20, the position of the limiting joint 3 can be adjusted again (for example, rotated or slid out) so that the end of the limiting joint 3 abuts against the needle handle 400 of the ablation needle 41. After approaching the lesion tissue, the position of the limiting joint 3 is reversely adjusted so that the ablation needle 41 can move freely to enter the lesion assembly for ablation.

[0055] It should be noted that the above description of the specific structure and movement mode of the limit joint 3 is not restrictive, and those skilled in the art can design it according to actual needs. The description of the interventional surgical instrument 4 is also not restrictive, and those skilled in the art can also use the corresponding double-lumen needle according to actual needs.

[0056] Taking ablation surgery as an example, the interventional surgical instrument 4 is an ablation needle 41. Before preparing for ablation surgery, the size of the tumor is determined through preliminary imaging examinations, and an ablation needle 41 of appropriate specifications is selected, and then a suitable double-lumen needle is matched. Figure 6 As shown, first, the needle 41 of the ablation needle 41 is inserted into the first channel 20 through the needle holder 1, as shown in FIG. Figure 7 As shown, the limit connector 3 is then clamped onto the needle 41, and the handle of the ablation needle 41 is pushed to engage with the limit connector 3. The navigation sensor is then inserted into the second channel 21 through the needle seat 1, and then the nut at one end of the sensor is screwed with the thread on the double-chamber seat to lock the relative position. At this time, any spatial position of the ablation needle 41 can be detected in real time on the positioning navigator. After the preliminary preparations are completed, the patient's skin where the needle 41 is inserted is disinfected and broken, and then the matched double-chamber needle and ablation needle 41 are punctured into the body at the same time. Following the guidance of ultrasound and the navigation system, the double-chamber needle reaches the outside of the ablation target tissue. The limit connector 3 is then removed, as shown Figure 8 As shown, the ablation needle 41 is pushed into the tumor or other lesion along the first channel 20 for ablation, and the double-chamber needle is left outside the ablated tissue. After the ablation is completed, the ablation needle 41 is withdrawn from the body through the double-chamber needle to avoid the occurrence of tumor cell abdominal wall transplantation.

[0057] On one hand, the present invention forms 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, so that the interventional surgical instrument 4 and the navigation sensor are integrated, and the spatial position of the interventional surgical instrument 4 in the body can be identified in real time through the navigation system. And through the setting of the navigation system, the position of the interventional surgical instrument 4 to puncture forward after the limit joint 3 is removed can be reserved, so that before the interventional surgical instrument 4 enters the target position, the actual position to be reached by the interventional surgical instrument 4 in the future can be seen, making the surgical operation accurate and simple.

[0058] 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 limit joint 3. Before reaching the target tissue, the interventional surgical instrument 4 extends out of the first channel 20 for a shorter length 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 accurate acquisition of the position of the front end of the interventional surgical instrument 4. When approaching the target tissue, the limit joint 3 is adjusted to allow the interventional surgical instrument 4 to further extend out of the first channel 20 to enter the target tissue for surgical operation, thereby achieving the technical effect of being able to accurately acquire the position of the front end of the interventional surgical instrument 4 during the intervention process, facilitating surgical operation, and reducing the impact of the front end of the interventional surgical instrument 4 on the navigation sensor and healthy tissue during the operation.

[0059] like Figure 1 As shown, in order to have a mutually independent first channel 20 and a second channel 21 in the needle body 2, in one embodiment, 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 inside and outside, the first needle tube 200 and the second needle tube 210 can be welded or adhesively fixed, 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 runs through the needle seat 1 and the first needle tube 200, and the second channel 21 runs through the needle seat 1 and the second needle tube 210.

[0060] Specifically, in this embodiment, the hollow cavity in the first needle tube 200 constitutes a part of the first channel 20, and the other part of the first channel 20 is located on the needle seat 1. The hollow cavity in the second needle tube 210 constitutes a part of the second channel 21, and the other part of the second channel 21 is located on the needle seat 1. In one embodiment, the diameter of the first needle tube 200 is greater than the diameter of the second needle tube 210. The first needle tube 200 is used for the ablation needle 41 to penetrate, and the second needle tube 210 is used for the electromagnetic navigation sensor to penetrate.

[0061] In order to accurately locate the position of the interventional surgical instrument 4 inserted in the first needle tube 200 and to avoid the influence of the interventional surgical instrument 4 on the navigation sensor during the surgical operation, the front end of the second needle tube 210 in this embodiment does not exceed the front end of the first needle tube 200. In other words, the front end of the second needle tube 210 can be flush with the front end of the first needle tube 200, or shorter than the front end of the first needle tube 200. As a preferred mode, the front end of the second needle tube 210 is preferably shorter than the front end of the first needle tube 200, and the distance between the two ends is 1-5 mm.

[0062] 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 connection arrangement. When the second needle tube 210 is sleeved on the inner side of the first needle tube 200, taking 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, the ablation needle 41 is generally cylindrical in structure. 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 meet the penetration of the cylindrical ablation needle 41, which will cause a lot of waste of space between the two needle tubes. Under the size limit, the diameter of the second needle tube 210 will become relatively larger, resulting in an increase in the diameter of the entire double-lumen needle.

[0063] Therefore, in order to improve the space utilization and control the size of the entire double-lumen needle within a reasonable range, such as Figure 1 As shown, in this embodiment, the second needle tube 210 is preferably arranged side by side on the outside of the first needle tube 200. In this embodiment, the diameter of the first needle tube 200 can match the ablation needle 41, so that there is no waste of space in the internal space of the first needle tube 200. Similarly, the diameter of the second needle tube 210 can also match the navigation sensor.

[0064] In some surgical operations, the front end of the second needle tube 210 needs to be punctured. Therefore, to facilitate puncture, the second end of the second needle tube 210 in this embodiment is a pointed end.

[0065] Since a portion of the first channel 20 and the second channel 21 are located in the needle seat 1, both the interventional surgical instrument 4 and the navigation sensor need to be inserted into the corresponding channels from the needle seat 1. Figure 1 As shown, the needle hub 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 .

[0066] In one embodiment, the first interface 10 and the second interface 11 can be side-by-side interfaces, and their axes are parallel. Although this structure can meet the insertion requirements of the interventional surgical instrument 4 and the navigation sensor, since the interventional surgical instrument 4 needs to be pushed forward during the surgical operation, the interventional double-lumen needle is prone to interfere with the cable part of the navigation sensor.

[0067] In another embodiment, if Figure 1 As shown, the needle seat 1 is configured as a Y-shaped structure, which includes a straight section and an inclined section, the first interface 10 is located on the straight section and corresponds to the first channel 20, and the first interface 10 is coaxial with the first channel 20. The second interface 11 is located on the inclined section, and the part of the second channel 21 located in the needle seat 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 staggered with the position of the first interface 10, and the movement of the interventional surgical instrument 4 will not interfere with the navigation sensor.

[0068] Since the interventional surgical instrument 4 is inserted into the first channel 20, there is a certain gap between the interventional surgical instrument 4 and the first channel 20. In order to prevent blood from flowing out of the end of the double-lumen needle through the gap during the operation, Figure 4 As shown, in this embodiment, a hemostatic valve 5 is provided at one end of the needle seat 1 away from the needle body 2, and the hemostatic valve 5 is used to hold the interventional surgical instrument 4 and block the gap between the rear end of the interventional surgical instrument 4 and the rear end of the first channel 20.

[0069] In this embodiment, the hemostatic valve 5 is a rotary hemostatic valve, including a screw head, a friction-reducing pad and silica gel. The screw head is mounted on the needle seat 1. By rotating the screw head, the silica gel is squeezed and deformed, so that the silica gel hugs the ablation needle 41, thereby isolating the blood. In this embodiment, the use of the rotary hemostatic valve 5 can prevent tissue blood from leaking out of the body through the gap during the puncture process or the operation process.

[0070] In the present invention, the function of the limit joint 3 is to control the movement of the interventional surgical instrument 4 along the first channel 20 in the interventional direction. In one embodiment of the limit joint 3, the limit joint 3 is used to be detachably clamped on the interventional surgical instrument 4, the first end of the limit joint 3 is used to abut against the fixed end 40 of the interventional surgical instrument 4, and the second end of the limit joint 3 is used to abut against the needle seat 1.

[0071] Specifically, in this embodiment, taking the interventional surgical instrument 4 as an ablation needle 41 as an example, the limit connector 3 can be clamped on the needle 41 of the ablation needle 41. After installation, the two ends of the limit connector 3 are respectively against the needle seat 1 and the needle handle 400 of the ablation needle 41, so that the needle 41 is fixed in the first channel 20 during the intervention process. After approaching the target position, the limit connector 3 can be removed from the needle 41, and 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.

[0072] In order to facilitate the clamping of the limit joint 3 on the interventional surgical instrument 4, as shown in FIG. Figure 3 As shown, the limit joint 3 in this embodiment is provided with a card slot 32 which penetrates axially. Furthermore, the card slot 32 includes a card-in section 320 and a clamping section 321 which are sequentially arranged along the card-in direction. The card-in section 320 is arranged as a shrinking structure, and the clamping section 321 is used to fit with the interventional surgical instrument 4.

[0073] In this embodiment, the insertion section 320 of the shrinking structure can facilitate the insertion of the interventional surgical instrument 4 (such as the needle 41 of the ablation needle 41), and the clamping section 321 can better hold the interventional surgical instrument 4. In this embodiment, the shrinking direction of the insertion section 320 is toward the clamping section 321, and the diameter of the clamping section 321 is larger than the minimum opening size of the insertion section 320, so as to ensure that the clamping section 321 holds the interventional surgical instrument 4 and the limit joint 3 will not fall off.

[0074] On the basis of the above-mentioned implementation mode, in order to further facilitate the installation and use of the limit joint 3, the limit joint 3 in this embodiment includes a shell 30 and an inner core 33; the inner core 33 is fixed in the shell 30, the shell 30 is configured as a rigid structure, the inner core 33 is elastic, the slot 32 is opened on the inner core 33, and a long strip opening 31 is provided at a position corresponding to the slot 32 of the shell 30, the first end of the shell 30 is used to abut against the fixed end 40 of the interventional surgical instrument 4, and the second end of the shell 30 is used to abut against the needle seat 1.

[0075] Specifically, in this embodiment, the limit joint 3 includes two parts, namely, a rigid shell 30 and an elastic inner core 33. The rigid shell 30 plays a role in ensuring that the limit joint 3 has sufficient structural strength. When the interventional surgical instrument 4 is limited, the two ends of the rigid shell 30 are respectively against the needle seat 1 and the fixed end 40 of the interventional surgical instrument 4. During installation, since the inner core 33 has a certain elasticity and the slot 32 is provided on the inner core 33, the inner core 33 can produce a certain amount of deformation during the installation process, so that the slot 32 can be more tightly clamped on the interventional surgical instrument 4. In an embodiment of the inner core 33, the inner core 33 can be made of rubber.

[0076] To facilitate the installation and removal of the limit joint 3, Figure 3 As shown, the limit joint 3 in this embodiment further includes a T-shaped piece 34, which is fixed to a side of the housing 30 away from the long strip opening 31. The T-shaped piece 34 can be used to facilitate manual disassembly of the limit joint 3. It is understandable that in addition to the T-shaped piece 34, other structures can also be provided, which are not limited in this embodiment.

[0077] In another embodiment of the limit joint 3, the limit joint 3 includes two separately arranged limit blocks, which are arranged opposite to each other and are used to be snap-fitted and fixed on the interventional surgical instrument 4, and the first end of the limit block is used to abut against the fixed end 40 of the interventional surgical instrument 4, and the second end of the limit block is used to abut against the needle seat 1.

[0078] Specifically, in this embodiment, the inner side of the limit block has an arc-shaped groove, and the two arc-shaped grooves can be tightly held on the interventional surgical instrument 4 during installation. The two limit blocks can be locked by a specific locking structure, for example, a buckle that can be snap-connected can be provided on the two limit blocks, or a bolt that can play a locking role can be provided, etc., which is not limited in this embodiment.

[0079] On the basis of the above embodiment, in order to enable the limit block to be better clamped and fixed on the interventional surgical instrument 4, the limit block includes an arc-shaped rigid shell and a flexible core, and an arc-shaped groove is provided on the flexible core. The flexible core can be made of rubber, and can better clamp the interventional surgical instrument 4 by utilizing its own elastic deformation.

[0080] In the embodiment where the limit block is provided with two pieces, since the corresponding buckle structure needs to be operated during installation and removal, installation and removal are relatively inconvenient. Preferably, an embodiment is adopted in which a clamping groove 32 is provided on the limit joint 3 and penetrates along the axial direction.

[0081] The embodiment of the present invention also provides a specific implementation of a puncture system based on electromagnetic positioning, including the double-chamber needle, the second electromagnetic navigation sensor and the navigation device in the above embodiment. When in use, the second electromagnetic navigation sensor is fixed on the ultrasound probe, and the ultrasound probe can be a surface probe or an intraoperative probe, without limitation. The navigation device is configured to extract the electromagnetic signals of the navigation sensor on the double-chamber needle and the second electromagnetic navigation sensor, and determine the spatial position relationship between the double-chamber needle and the ultrasound probe based on the electromagnetic signals.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Within the spirit and principle of the present invention, any modification, equivalent replacement, improvement, etc. made shall be included in the protection scope of the present invention.

Claims

1. A double-lumen needle, characterized in that: include: Needle holder; A needle body, wherein the needle body is fixedly mounted on the needle seat; a first channel, the first channel running through the needle seat and the needle body, the first channel being used for allowing an interventional surgical instrument to pass through; a second channel, the second channel running through the needle seat and the needle body, the second channel being independent of the first channel, and the second channel being used for allowing a navigation sensor to penetrate; a limit joint, the limit joint being used to be detachably clamped on the interventional surgical instrument, the first end of the limit joint being used to abut against the fixed end of the interventional surgical instrument, and the second end of the limit joint being used to abut against the needle seat, so as to control the movement amount of the interventional surgical instrument along the first channel in the intervention direction through the limit joint; The limit joint is provided with a card slot, and the card slot is used for card connection to the interventional surgical instrument.

2. The double-lumen needle according to claim 1, characterized in that: 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 runs through the needle seat and the first needle tube, and the second channel runs through the needle seat and the second needle tube.

3. The double-lumen needle according to claim 2, characterized in that: The second needle tube is arranged outside the first needle tube and is closely attached to the first needle tube.

4. The double-lumen needle according to claim 1, characterized in that: The needle seat includes a first interface and a second interface, the first interface corresponds to the first channel, and the second interface corresponds to the second channel.

5. The double-lumen needle according to claim 1, characterized in that: A hemostatic valve is arranged at one end of the needle seat away from the needle body, and the hemostatic valve is used to hold the interventional surgical instrument tightly and block the gap between the rear end of the interventional surgical instrument and the rear end of the first channel.

6. The double-lumen needle according to claim 2, characterized in that: The front end of the second needle tube does not exceed the front end of the first needle tube, and the front end of the second needle tube is configured as a pointed end.

7. The double-lumen needle according to claim 1, characterized in that: The clamping slot is penetrated along the axial direction of the limit joint, and the clamping slot includes a clamping section and a clamping section which are sequentially arranged along the clamping direction, the clamping section is arranged as a shrinking structure, and the clamping section is used to fit with the interventional surgical instrument.

8. The double-lumen needle according to claim 7, characterized in that: The limit joint comprises a shell and an inner core; The inner core is fixed in the shell, the shell is set as a rigid structure, the inner core is elastic, the slot is opened on the inner core, the shell is provided with a long strip opening at a position corresponding to the slot, the first end of the shell is used to abut against the fixed end of the interventional surgical instrument, and the second end of the shell is used to abut against the needle seat.

9. The double-lumen needle according to claim 8, characterized in that: The limit joint further comprises a T-shaped piece, and the T-shaped piece is fixed on a side of the shell away from the long strip opening.

10. A double-lumen needle, characterized in that: include: Needle holder; A needle body, wherein the needle body is fixed on the needle seat; a first channel, the first channel running through the needle seat and the needle body, the first channel being used for allowing an interventional surgical instrument to pass through; a second channel, the second channel running through the needle seat and the needle body, the second channel being independent of the first channel, and the second channel being used for allowing a navigation sensor to penetrate; a limit joint, the limit joint being used to be detachably clamped on the interventional surgical instrument, the first end of the limit joint being used to abut against the fixed end of the interventional surgical instrument, and the second end of the limit joint being used to abut against the needle seat, so as to control the movement amount of the interventional surgical instrument along the first channel in the intervention direction through the limit joint; The limit joint includes two separately arranged limit blocks, which are arranged opposite to each other and used to be snap-fitted and fixed on the interventional surgical instrument. The first end of the limit block is used to abut against the fixed end of the interventional surgical instrument, and the second end of the limit block is used to abut against the needle seat.

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