Navigation puncture needle

Abstract

The utility model discloses a navigation puncture needle which comprises a needle body, the front end of the needle body is arranged to be a closed tip end, an installation channel is formed in the needle body, and the installation channel is used for installing a navigation sensor; the needle body comprises a transition section, the transition section is arranged to be spiral, and the transition section is located at the position where the needle body is bent in the interventional process. According to the navigation puncture needle, a navigation sensor can be installed through the installation channel in the needle body, puncture navigation can be conducted in the puncture process, the accuracy of a puncture operation is improved, in addition, the passing performance of the navigation puncture needle in a bent pipe is improved, the better rebound resilience can be achieved, and meanwhile the navigation puncture needle is not prone to being broken when bent.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and more specifically, to a navigation puncture needle. Background Technology

[0002] Currently, most existing puncture needles use solid stainless steel rods as the main body, which cannot be used with navigation devices for navigation during the puncture process, resulting in the inability to achieve accurate puncture.

[0003] In addition, since a curved tube needs to be inserted into the human body first during the puncture procedure, the puncture needle is inserted through the channel established by the curved tube. The front end of the curved tube has a curved section. When the puncture needle enters the curved tube and is punctured, part of the puncture needle will bend along with the curved tube. However, the puncture needle in the relevant technology is not easy to bend and is prone to breakage when bending. Utility Model Content

[0004] The main objective of this invention is to provide a navigation puncture needle to solve the problems in related technologies, such as the inability of puncture needles to be used with navigation devices for navigation during puncture, and the difficulty in bending puncture needles, which are prone to breakage when bent.

[0005] To achieve the above objectives, this utility model provides

[0006] A navigation puncture needle, comprising:

[0007] The needle body has a closed tip at its front end and an installation channel inside the needle body for mounting a navigation sensor.

[0008] The needle body includes a transition section, which is spiral-shaped and located at the position where the needle body bends during intervention.

[0009] Furthermore, the needle body is provided with spiral grooves to form the transition section.

[0010] Furthermore, the needle body includes:

[0011] The first needle tube has a closed tip at its front end and an installation channel on its inner side.

[0012] The second needle tube is sleeved on the outside of the first needle tube, and the tip is located at the front end of the second needle tube. The second needle tube includes the transition section.

[0013] Furthermore, the wall of the second needle tube is cut through in a spiral direction to form the transition section;

[0014] At least two sealing structures are provided between the first needle tube and the second needle tube, and the two sealing structures are respectively located at both ends of the transition section.

[0015] Furthermore, the transition section includes a first segment, a second segment, and a third segment connected in sequence, wherein the pitch of the first segment and the third segment is greater than the pitch of the second segment.

[0016] Furthermore, the pitch of each segment on the first body is the same, and the pitch of each segment on the third body is the same; or, the pitch of each segment on the first body decreases sequentially along the direction toward the second body.

[0017] The pitch of each segment on the third body decreases sequentially along the direction toward the second body.

[0018] Furthermore, the outer diameter of the first segment gradually decreases along the direction toward the second segment, and the outer diameter of the third segment also gradually decreases along the direction toward the second segment.

[0019] Furthermore, the first needle tube and the second needle tube are fixedly connected.

[0020] Furthermore, the first needle tube includes an inner needle body and a needle tip, the inner needle body being sleeved inside the second needle tube, and the needle tip being fixed to the front end of the inner needle body and extending out of the second needle tube to form the tip.

[0021] The inner side of the inner needle body is provided with the installation channel.

[0022] Furthermore, a boss is provided at the rear end of the needle tip, the boss is inserted into the installation channel, and the rear end face of the needle tip abuts against the front end face of the inner needle body and the front end face of the second needle tube.

[0023] The rear end face of the needle tip is sealed and fixedly connected to the front end face of the second needle tube.

[0024] In this embodiment of the invention, a needle body is provided with a closed tip at the front end and a hollow mounting channel inside the needle body for mounting a navigation sensor. The needle body includes a transition section, which is spiral-shaped and located at the point where the needle body bends during intervention. On the one hand, the mounting channel inside the needle body allows the navigation sensor to be mounted, enabling puncture navigation during the puncture process. This achieves the technical effect of improving the accuracy of the puncture surgery and solves the problem in related technologies where the puncture needle cannot be used with a navigation device for navigation during the puncture process.

[0025] On the other hand, the section where the needle body will bend is set as a spiral transition section, which makes the transition section easier to bend than other parts of the needle body. This increases the passage performance of the navigation puncture needle in the curved tube and provides better rebound performance. At the same time, it is not easy to break when bending, thus solving the problem that the navigation puncture needle is not easy to bend and is easy to break when bending in related technologies.

[0026] On the other hand, by adjusting the pitch of different segments on the transition section, the stress during bending deformation of the transition section is transferred from the end of the transition section to the middle area with a smaller pitch, thus avoiding excessive stress and damage to the connection between the end of the transition section and the second needle tube during bending. Attached Figure Description

[0027] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model, making other features, objects, and advantages of the utility model more apparent. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0028] Figure 1 This is a schematic diagram of the navigation puncture needle according to an embodiment of the present invention;

[0029] Figure 2 This is a cross-sectional view of the navigation puncture needle according to an embodiment of the present invention;

[0030] Figure 3 This is a partial cross-sectional view of the navigation puncture needle according to an embodiment of the present invention;

[0031] Figure 4 This is a partial structural schematic diagram of the navigation puncture needle according to one embodiment of the present invention;

[0032] Figure 5 This is a partially enlarged structural diagram of the navigation puncture needle according to one embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram of stress transfer according to an embodiment of the present invention;

[0034] Among them, 1 is the first needle tube, 2 is the second needle tube, 20 is the transition section, 201 is the first section body, 202 is the second section body, 203 is the third section body, 3 is the installation channel, 4 is the tip, 401 is the needle tip, 402 is the boss, 5 is the sealing structure, and 6 is the needle body. Detailed Implementation

[0035] In order to help those skilled in the art better understand the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this utility model 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 utility model described herein.

[0037] In this invention, 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 for the purpose of better describing this invention 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.

[0038] Furthermore, in addition to indicating direction 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 utility model according to the specific circumstances.

[0039] Furthermore, the terms "set up," "equipped with," "connected," and "fixed" should be interpreted broadly. 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, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0040] In addition, the term "multiple" should mean two or more.

[0041] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other. The present utility model will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] To solve related technical problems, such as Figure 1 and Figure 2 As shown, this embodiment of the present invention provides a navigation puncture needle, comprising:

[0043] The needle body 6 has a closed tip 4 at its front end and a hollow mounting channel 3 inside the needle body 6 for mounting a navigation sensor.

[0044] The needle body 6 includes a transition section 20, which is spiral-shaped and located at the position where the needle body 6 bends during intervention.

[0045] In this embodiment, the front end of the needle body 6 is closed and has a tip 4, through which puncture can be performed. An installation channel 3 is provided within the needle body 6. The front end of the installation channel 3 is closed, and the rear end has an opening. A navigation sensor can be inserted through the opening at the rear end of the installation channel 3 and extend to the front end of the installation channel 3 to approach the tip 4 of the needle body 6. Depending on the navigation method, different navigation sensors can be installed. In one embodiment, the navigation sensor can be an electromagnetic navigation sensor. By cooperating with an external navigation device, it can locate the spatial position of the navigation puncture needle tip during puncture, improving the accuracy of the puncture surgery and solving the problem in related technologies where navigation puncture needles cannot be used with navigation devices for navigation during puncture.

[0046] To facilitate the bending and rebound of the needle body 6, a transition section 20 is provided on the needle body 6 in this embodiment. The transition section 20 is located at the position where the needle body 6 bends after passing through the curved tube, that is, the position of the transition section 20 is the same as the position on the needle body 6 that will bend during the intervention process. In this embodiment, the transition section 20 is set in a spiral shape.

[0047] like Figure 1 As shown, in one embodiment, the needle body 6 is a single needle, and a groove is cut into the outer wall of the needle. The groove extends spirally along the needle's axis to form a spiral transition section 20. The depth of the groove can be less than the needle's wall thickness, so that the groove does not communicate with the mounting channel 3, thereby preventing blood from entering the mounting channel 3 during intervention and affecting the navigation sensor. In this embodiment, since the groove is only made on the outer wall of the needle, and the depth of the groove does not extend to the mounting channel, there is no need to seal between the groove and the mounting channel, and the needle has sufficient structural strength.

[0048] In another embodiment, a needle body 6 is formed by attaching a needle tube to a complete needle. The needle has an installation channel inside, and a spiral transition section 20 is formed by cutting at a bend in the needle tube. Since the needle tube is attached to the outside of the needle in this embodiment, the needle tube and the installation channel 3 inside the needle are isolated. Therefore, when cutting the needle tube, the wall of the needle tube can be penetrated, or it can be left uncut. After penetrating the needle tube wall, it is necessary to prevent blood from entering the needle tube through the cut at the transition section 20 and then into the installation channel 3, which could cause the blood to come into contact with the navigation sensor inside the installation channel 3. Therefore, a sealing structure is required between the needle tube and the needle to seal and isolate the installation channel 3 and the transition section 20. In this embodiment, the diameter of the needle can be made smaller. Directly creating grooves on the outer wall of the needle is difficult and affects the needle's strength. After attaching the needle tube to the needle, cutting a spiral transition section on the needle tube ensures sufficient bending performance of the needle body as a whole and also protects the needle.

[0049] In addition, it should be noted that the specific configuration of the transition segment 20 is not limited in this embodiment, and those skilled in the art can design it according to the actual situation.

[0050] In this embodiment, after forming a spiral transition section 20 on the needle body 6, the transition section 20 is easier to bend, which increases the passage performance of the navigation puncture needle in the curved tube and has better rebound performance. At the same time, it is not easy to break when bending, thus solving the problem that the puncture needle is not easy to bend and is easy to break when bending in related technologies. Secondly, when the transition section 20 is part of the needle body 6 or part of the outer needle tube, the connection between the transition section 20 and the two ends is not easy to break during the bending process, thus improving the safety of use.

[0051] like Figures 3 to 4 As shown, in one embodiment of the needle body 6, to reduce manufacturing difficulty and ensure the mechanical properties of the navigation puncture needle, the needle body 6 in this embodiment includes:

[0052] The first needle tube 1 has a closed tip 4 at its front end and a hollow mounting channel 3 on its inner side for mounting a navigation sensor.

[0053] The second needle tube 2 is sleeved on the outside of the first needle tube 1, and the tip 4 is located at the front end of the second needle tube 2.

[0054] The second needle tube 2 includes a transition section 20, which is spiral-shaped. Both ends of the transition section 20 are fixedly connected to the first needle tube 1. The transition section 20 is the position where the second needle tube 2 bends during intervention.

[0055] In this embodiment, the navigation puncture needle includes a first needle tube 1 and a second needle tube 2 with inner and outer sleeves. Both the first needle tube 1 and the second needle tube 2 are hollow structures. The first needle tube 1 is fixedly sleeved inside the second needle tube 2. The first needle tube 1 has a hollow installation channel 3. When puncture navigation is required, the navigation sensor can be installed in the installation channel 3.

[0056] To achieve puncture, a tip 4 is provided at the front end of the first needle tube 1. The tip 4 can be part of the first needle tube 1 or a structure independently installed at the front end of the first needle tube 1. This embodiment does not limit it.

[0057] The second needle tube 2 is sleeved and fixed to the outside of the first needle tube 1. The second needle tube 2 serves as a protective structure for the first needle tube 1, preventing it from breaking during bending. Figure 4 As shown, the second needle tube 2 has a transition section 20. The front end of the transition section 20 is a certain distance away from the front end of the second needle tube 2. The position and length of the transition section 20 are determined according to the bending position of the tube. In one embodiment, the front end of the transition section 20 is 9mm away from the front end of the second needle tube 2, and the length of the transition section 20 is 80mm. In this embodiment, the specific position and length of the transition section 20 are not limited, and those skilled in the art can design it according to actual needs.

[0058] like Figure 4 As shown, to facilitate the bending and rebound of the second needle tube 2, the transition section 20 in this embodiment is set in a spiral shape. Specifically, the spiral transition section 20 can be formed by cutting the hollow second needle tube 2 in a spiral direction. The cutting depth can be less than the thickness of the second needle tube 2, thereby forming a groove that does not penetrate the tube wall of the second needle tube 2. To further increase the deformability of the transition section, the cutting depth can be equal to the thickness of the second needle tube 2, thereby penetrating the tube wall of the second needle tube 2. After penetration, during the puncture process, blood will enter the area between the transition section 20 and the first needle tube 1 through the gap on the transition section 20. To prevent blood from flowing into other areas between the second needle tube 2 and the first needle tube 1, it is necessary to seal both ends of the transition section 20 and the first needle tube 1 to isolate blood flow.

[0059] Since the spiral transition section 20 in this embodiment is part of the second needle tube 2 and is an integral structure with the second needle tube 2, the connection strength between the transition section 20 and the second needle tube 2 is higher than that between the two ends of the spiral winding wire and the needle body in the related technology. It is not easy to break or crack during bending, which improves the safety of the navigation puncture needle. It solves the problems in the related technology that the navigation puncture needle cannot be used with a navigation device for navigation during puncture, and that the weld point between the transition section 20 and the navigation puncture needle is subjected to large forces during bending, which makes it easy to detach the weld and cause the transition section 20 to break.

[0060] In summary, this invention, on the one hand, utilizes the mounting channel 3 within the first needle tube 1 to install a navigation sensor, enabling puncture navigation during the puncture process. This improves the precision of the puncture procedure and solves the problem in related technologies where navigation puncture needles cannot be used with navigation devices during puncture. On the other hand, a portion of the second needle tube 2 is formed into a spiral transition section 20, which is an integral part of the second needle tube 2. This increases the connection strength between the transition section 20 and the second needle tube 2, making it less prone to breakage or cracking when the transition section 20 is bent. This improves the safety of the navigation puncture needle and solves the problems in related technologies where navigation puncture needles cannot be used with navigation devices during puncture, and where the weld points between the transition section made of wire and the navigation puncture needle are subjected to high stress during bending, making them prone to detachment and causing the transition section 20 to break apart.

[0061] Based on the spiral structure cut into the transition section 20 of the second needle tube 2, the overall pitch of the transition section 20 has multiple distribution patterns. In one embodiment, the pitch of each segment on the transition section 20 is the same; in another embodiment, the pitch of some segments on the transition section 20 is the same, while the pitch of some segments is different.

[0062] When the pitch of each segment on the transition section 20 is the same, the stress on the transition section 20 is concentrated at its end when it bends, i.e., the starting point of the helix on the transition section 20. At this point, the transition section 20 is prone to deformation and breakage at the end after bending. Therefore, in this embodiment, the pitch on the transition section 20 is further adjusted, specifically, as follows: Figure 4 As shown, the transition section 20 includes a first section 201, a second section 202, and a third section 203 connected in sequence. The pitch of the first section 201 and the third section 203 is greater than the pitch of the second section 202.

[0063] In this embodiment, the second segment 202 is the middle part of the transition segment 20. When the pitch of the second segment 202 is smaller than the pitch of the first segment 201 and the third segment 203 at both ends, the second segment 202 is more prone to bending deformation than the first segment 201 and the third segment 203. Therefore, when the transition segment 20 bends, the stress is transferred from the connection point between the first segment 201 and the second needle tube 2 to the second segment 202 (e.g., ...). Figure 6 As shown, the transition section 20 is moved from the starting position A of the spiral to the position B near the middle, which makes the transition section 20 less prone to deformation and breakage when bending, and can also maintain sufficient springiness.

[0064] Furthermore, since the third segment 203 is relatively closer to the tip 4 of the navigation puncture needle, it also needs sufficient support to facilitate control of the tip 4. Therefore, in this embodiment, the pitch of the third segment 203 is also greater than the pitch of the second segment 202, thus ensuring sufficient support stability while giving the third segment 203 a certain degree of bending capability, in order to facilitate the movement of the tip 4 of the navigation puncture needle.

[0065] Furthermore, in this embodiment, when the transition section 20 has an unequal pitch distribution, the smoothness of the needle body 6 passing through tubes bent at various angles is increased.

[0066] To ensure sufficient bending performance and effective stress transfer, in one embodiment, the pitch of the second segment 202 is one-third to one-half the pitch of the first segment 201. Of course, this is not limiting, and those skilled in the art can adjust it according to actual needs.

[0067] When the pitch of the first segment 201 and the pitch of the third segment 203 are both greater than the pitch of the second segment 202, the pitch of the first segment 201 and the pitch of the third segment 203 must have at least two structural forms. For example... Figure 4 As shown, in one embodiment, the pitch of each segment on the first body 201 is the same, that is, the first body 201 is a helical structure with equal pitch. Similarly, the pitch of each segment on the third body 203 is the same, meaning the third body 203 is also a helical structure with equal pitch. In this embodiment, the pitch of the first body 201 and the third body 203 can be 2 mm, and the pitch of the second body 202 can be 1 mm. Of course, this is not limiting, and those skilled in the art can adjust it according to actual needs.

[0068] In another embodiment, the pitch of each segment on the first segment 201 decreases sequentially in the direction toward the second segment 202, and the pitch of each segment on the third segment 203 decreases sequentially in the direction toward the second segment 202.

[0069] When adjusting the pitch of each segment on the transition section 20 for the purposes of stress transfer and support strength, computer software can be used for kinematic simulation to design pitch changes that meet the requirements. This will not be elaborated on in this embodiment.

[0070] Additionally, it should be noted that the transition section 20 on the second needle tube 2 can be configured as a section with a constant diameter or a section with a variable diameter. When the diameter is variable, the outer diameter of the first segment 201 in the transition section 20 gradually decreases along the direction toward the second segment 202, and the outer diameter of the third segment 203 gradually decreases along the direction toward the second segment 202.

[0071] like Figure 5 As shown, in one embodiment of sealing the transition section 20 between its two ends and the first needle tube 1, at least two sealing structures 5 are provided between the first needle tube 1 and the second needle tube 2, respectively located at both ends of the transition section 20. In this embodiment, the two sealing structures 5 can be close to the spiral start end and spiral end of the transition section 20, or they can be a distance away from the spiral start end and spiral end of the transition section 20. The sealing structure 5 can be a sealing ring fitted onto the first needle tube 1 or a sealing filler filled between the first needle tube 1 and the second needle tube 2, etc., and no limitation is made here.

[0072] To further strengthen the connection between the first needle tube 1 and the second needle tube 2, in this embodiment, the first needle tube 1 and the second needle tube 2 are fixedly connected, and the fixed connection position needs to avoid the transition section 20. In one embodiment, the first needle tube 1 and the second needle tube 2 can be welded together, and the welding position can be located at both ends of the transition section 20. In another embodiment, the rear ends of both the first needle tube 1 and the second needle tube 2 can be fixed to the needle hub. Those skilled in the art can adopt appropriate fixed connection methods according to actual needs, and this embodiment does not impose any restrictions on them.

[0073] like Figure 3 As shown, in one embodiment of the first needle tube 1, the first needle tube 1 includes an inner needle body and a needle tip 401. The inner needle body is sleeved inside the second needle tube 2, and the needle tip 401 is fixed to the front end of the inner needle body and extends out of the second needle tube 2 to form a tip 4. An installation channel 3 is provided on the inner side of the inner needle body.

[0074] Specifically, in this embodiment, the needle body has a hollow cavity to form an installation channel 3. The rear end of the needle tip 401 is fitted into and fixedly connected within the installation channel 3, and the front end of the needle tip 401 extends out of the front end of the second needle tube 2. The navigation sensor is inserted from the rear end of the installation channel 3 and extends along the installation channel 3 to the front end, making the navigation sensor relatively close to the needle tip 401, thereby facilitating precise positioning and navigation of the needle tip 401 during puncture.

[0075] It is understandable that, in addition to forming the first needle tube 1 by mounting the needle tip 401 on the inner needle body, it can also be formed by processing a hollow stainless steel tube. Specifically, before processing, the hollow cavity inside the hollow stainless steel tube serves as the mounting channel 3 for mounting the navigation sensor. The front end of the hollow cavity is a closed structure, and the rear end is an open structure. Furthermore, the front end of the stainless steel tube has a solid section, and the tip 4 is formed by grinding the solid section.

[0076] Since the second needle tube 2 needs to be fitted onto the outside of the first needle tube 1, if the tip 4 is directly machined at the front end of the first needle tube 1, a step surface will be formed between the second needle tube 2 fitted onto the first needle tube 1 and the tip 4, which is not conducive to puncture. To eliminate the step surface, the portion of the first needle tube 1 excluding the tip 4 needs to be thinned. The degree of thinning should be equal to the difference between the inner and outer diameters of the second needle tube 2, so that after the second needle tube 2 is fitted onto the first needle tube 1, the outer surface of the second needle tube 2 can be flush with the rear end of the tip 4. However, thinning the first needle tube 1 is difficult and the process is complex.

[0077] Therefore, for ease of puncture and processing, such as Figure 3 As shown, in this embodiment, the first needle tube 1 is preferably formed by mounting the needle tip 401 onto the inner needle body. Furthermore, a boss 402 is provided at the rear end of the needle tip 401, forming a stepped surface between the boss 402 and the rear end face of the needle tip 401. The boss 402 and the needle tip 401 are arranged coaxially. During installation, the boss 402 is inserted into the installation channel 3. The installation channel 3, the first needle tube 1, and the second needle tube 2 are all coaxial. The diameter of the rear end of the needle tip 401 is equal to the outer diameter of the second needle tube 2. The rear end face of the needle tip 401 abuts against the front end face of the inner needle body and the front end face of the second needle tube 2, thereby ensuring that the rear end of the needle tip 401 is flush with the surface of the second needle tube 2 after installation.

[0078] To prevent blood from seeping in, the rear end face of the needle tip 401 is sealed and fixedly connected to the front end face of the second needle tube 2. Specifically, this can be achieved by welding the rear end of the needle tip 401 to the front end of the second needle tube 2 or by filling with sealant, etc. In this embodiment, no restrictions are placed on the specific sealing method.

[0079] According to another aspect of this application, a method for preparing a navigation puncture needle is provided, comprising the following steps:

[0080] A needle body 6 is provided, the front end of the needle body 6 has a closed tip 4, and the needle body 6 has a hollow mounting channel 3 inside, the mounting channel 3 is used to mount a navigation sensor;

[0081] Based on the bending position of the needle body 6 during the intervention process, a spiral transition section 20 is formed by cutting at the bending position of the needle body 6.

[0082] In this embodiment, the needle body 6 can be a hollow needle. During processing, a spiral groove can be cut into the bend of the needle using laser cutting to form the transition section 20. Since the mounting channel inside the needle needs to install a navigation sensor, the cutting depth needs to be controlled during cutting to prevent the groove from penetrating the needle wall. Of course, the spiral groove can also be formed by etching. This embodiment does not limit the specific groove processing method.

[0083] In another embodiment, when the needle body 6 includes a first needle tube 1 and a second needle tube 2, the preparation method further includes:

[0084] S10. A first needle tube 1 is provided, the front end of the first needle tube 1 has a tip 4, and a hollow mounting channel 3 is provided on the inner side of the first needle tube 1 for mounting a navigation sensor.

[0085] S20. Prepare a second needle tube 2, and form a spiral transition section 20 on the hollow needle body. The transition section 20 includes a first segment 201, a second segment 202 and a third segment 203 connected in sequence. The pitch of the first segment 201 and the third segment 203 is greater than the pitch of the second segment 202.

[0086] S30. The second needle tube 2 is attached to the first needle tube 1 and fixed, with the tip 4 located at the front end of the second needle tube 2.

[0087] In this embodiment, the first needle tube 1 can be a prefabricated needle body. Structurally, it should have a tip 4 at the front end of the needle body for puncture, and a hollow mounting channel 3 inside the needle body for mounting a navigation sensor (e.g., an electromagnetic navigation sensor). Of course, it is understood that the prefabrication process will differ depending on the structural form of the first needle tube 1. In this embodiment, the first needle tube 1 preferably includes an inner needle body and a needle tip 401. The rear end of the needle tip 401 is formed into a coaxial boss 402 through a grinding process. The inner needle body is a hollow tubular structure, utilizing the hollow cavity to form the mounting channel 3. During assembly, the boss 402 at the rear end of the needle tip 401 can be inserted into and fixed within the mounting channel 3. The boss 402 can be fixed by an interference fit with the front end of the mounting channel 3 or by applying adhesive to the boss 402; this embodiment does not impose any limitations on this method.

[0088] For the second needle tube 2, a hollow stainless steel tube can be used as the needle body. The bending position of the needle body during puncture is determined based on the location of the bend in the tube, and the position and length of the transition section 20 on the needle body are determined based on the bending position. In one embodiment, the front end of the transition section 20 is approximately 9mm from the front end of the needle body, and the length of the transition section 20 is approximately 80mm. After determining the position of the transition section 20, a spiral transition section 20 is formed by cutting along the circumference of the needle body. The cutting method can be laser cutting, which has the advantages of high cutting precision and ease of control. Since a spiral transition section 20 needs to be cut, the needle body can be controlled to rotate during the feeding process, or the rotation of the laser emitter and the linear feeding of the needle body can be controlled separately, etc. This embodiment does not impose any limitations on these methods.

[0089] After cutting the transition section 20, the second needle tube 2 is then fitted onto the first needle tube 1 and secured. The tip 4 of the first needle tube 1 needs to extend beyond the front end of the second needle tube 2 for puncture. To prevent blood from seeping into the gap between the first needle tube 1 and the second needle tube 2 during securing, both ends of the transition section 20 need to be sealed.

[0090] like Figure 5 As shown, in one sealing method, two welding points can be formed between the first needle tube 1 and the second needle tube 2. These two welding points are located at both ends of the transition section 20, forming both a fixed connection structure for the first needle tube 1 and the second needle tube 2, and a sealing structure 5 at both ends of the transition section 20. Alternatively, two adhesive application points can be arranged on the first needle tube 1, located at both ends of the transition section 20. These two adhesive application points bond and fix the first needle tube 1 and the second needle tube 2, simultaneously forming the sealing structure 5 at both ends of the transition section 20.

[0091] Additionally, it should be noted that, for the embodiment where the needle body includes the first needle tube and the second needle tube, in order to transfer the bending stress from the starting end of the spiral to the middle region of the spiral, the transition section 20 is a spiral structure with varying pitch. Therefore, during cutting, the feed rate needs to be varied and controlled to cut a spiral structure that meets the design pitch.

[0092] In one embodiment, cutting a spiral transition section 20 into the hollow needle tube includes:

[0093] The first segment 201 is formed by spiral cutting along the axis of the needle tube according to the first feed rate;

[0094] The second segment 202 is formed by spiral cutting along the axial direction of the needle tube from the end of the first segment 201 with a second feed rate;

[0095] The third segment 203 is formed by spiral cutting along the axial direction of the needle tube from the end of the second segment 202 with a third feed rate;

[0096] The second feed rate is less than the first feed rate and the third feed rate.

[0097] Specifically, in this embodiment, the transition segment 20 is divided into a first segment 201, a second segment 202, and a third segment 203 connected sequentially. The first segment 201 and the third segment 203 can be helical structures with equal pitch, and the second segment 202 can also be a helical structure with equal pitch, but the pitch of the second segment 202 is smaller than the pitch of the first segment 201 and the third segment 203. When preparing the transition segment 20, after cutting the first segment 201 by feeding an equal amount according to the first feed rate, the feed rate needs to be reduced, and the second segment 202 needs to be cut by feeding an equal amount according to the second feed rate. After cutting the second segment 202, the feed rate needs to be increased and the third segment 203 needs to be cut by feeding an equal amount according to the third feed rate.

[0098] When the needle body consists of only one needle, the process of cutting at the curved position of the needle body 6 to form a spiral transition section 20 is the same, and will not be described again in this embodiment.

[0099] This utility model embodiment also provides a specific implementation of a puncture system based on electromagnetic positioning, including the navigation puncture needle, the second electromagnetic navigation sensor, and the navigation device described in the above embodiment. 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. The navigation device is configured to extract the electromagnetic signals from the navigation sensor and the second electromagnetic navigation sensor on the navigation puncture needle, and determine the spatial positional relationship between the navigation puncture needle and the ultrasound probe based on the electromagnetic signals.

[0100] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A navigation puncture needle, characterized in that, include: The needle body has a closed tip at its front end and an installation channel inside the needle body for mounting a navigation sensor. The needle body includes a transition section, which is spiral-shaped and located at the position where the needle body bends during intervention.

2. The navigation puncture needle according to claim 1, characterized in that, The needle body is provided with a spiral groove to form the transition section.

3. The navigation puncture needle according to claim 1, characterized in that, The needle body includes: The first needle tube has a closed tip at its front end and an installation channel on its inner side. The second needle tube is sleeved on the outside of the first needle tube, and the tip is located at the front end of the second needle tube. The second needle tube includes the transition section.

4. The navigation puncture needle according to claim 3, characterized in that, The second needle tube is spirally cut through its wall to form the transition section; At least two sealing structures are provided between the first needle tube and the second needle tube, and the two sealing structures are respectively located at both ends of the transition section.

5. The navigation puncture needle according to claim 3, characterized in that, The transition section includes a first segment, a second segment, and a third segment connected in sequence, wherein the pitch of the first segment and the third segment is greater than the pitch of the second segment.

6. The navigation puncture needle according to claim 5, characterized in that, The pitch of each segment on the first body is the same, and the pitch of each segment on the third body is the same; or, the pitch of each segment on the first body decreases sequentially along the direction toward the second body. The pitch of each segment on the third body decreases sequentially along the direction toward the second body.

7. The navigation puncture needle according to claim 5, characterized in that, The outer diameter of the first segment gradually decreases along the direction toward the second segment, and the outer diameter of the third segment gradually decreases along the direction toward the second segment.

8. The navigation puncture needle according to claim 4, characterized in that, The first needle tube and the second needle tube are fixedly connected.

9. The navigation puncture needle according to claim 3, characterized in that, The first needle tube includes an inner needle body and a needle tip. The inner needle body is sleeved inside the second needle tube, and the needle tip is fixed to the front end of the inner needle body and extends out of the second needle tube to form the tip. The inner side of the inner needle body is provided with the installation channel.

10. The navigation puncture needle according to claim 9, characterized in that, The rear end of the needle tip is provided with a boss, which is inserted into the installation channel. The rear end face of the needle tip abuts against the front end face of the inner needle body and the front end face of the second needle tube. The rear end face of the needle tip is sealed and fixedly connected to the front end face of the second needle tube.

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