Puncture needle

Abstract

The present invention discloses a puncture needle, which comprises: a first needle tube, the front end of the first needle tube is set as a closed tip, the inner side of the first needle tube is provided with an installation channel, and the installation channel is used to install a navigation sensor; a second needle tube, the second needle tube is sleeved on the outer side of the first needle tube, the tip is located at the front end of the second needle tube, the second needle tube comprises a transition section, the transition section is set in a spiral shape, and the transition section is located at the position where the second needle tube bends during the intervention process; the transition section comprises a first section body, a second section body and a third section body connected in sequence, and the pitches of the first section body and the third section body are both greater than the pitch of the second section body. The present invention utilizes the installation channel in the needle body to install a navigation sensor, can perform puncture navigation during the puncture process, improve the accuracy of the puncture operation, and in addition, increases the passing performance of the puncture needle in the curved tube, and can have better rebound performance, and is not easy to break when bent.

Description

Technical Field

[0001] The present invention relates to the technical field of medical equipment, and in particular to a puncture needle. Background Art

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

[0003] In addition, since the curved tube needs to be inserted into the human body first during the puncture operation, the puncture needle is inserted through the channel established by the curved tube, and the front end of the curved tube has a curved portion. When the puncture needle enters the curved tube for puncture, a part of the puncture needle will bend along with the curved tube, but the puncture needle in the related art is not easy to bend and is prone to breakage when bent. Summary of the invention

[0004] The main purpose of the present invention is to provide a puncture needle to solve the problems in the related art that the puncture needle cannot be used with a navigation device for navigation during the puncture process, and the puncture needle is not easy to bend and is prone to breakage when bent.

[0005] In order to achieve the above object, the present invention provides a puncture needle, comprising:

[0006] a first needle tube, wherein the front end of the first needle tube is configured as a closed tip, and an installation channel is provided on the inner side of the first needle tube, and the installation channel is used to install a navigation sensor;

[0007] a second needle tube, the second needle tube is sleeved on the outside of the first needle tube, the tip is located at the front end of the second needle tube, the second needle tube comprises a transition section, the transition section is arranged in a spiral shape, and the transition section is located at a position where the second needle tube is bent during the intervention process;

[0008] The transition section comprises a first section, a second section and a third section which are connected in sequence, and the pitches of the first section and the third section are both greater than the pitch of the second section.

[0009] Furthermore, a spiral groove is provided on the second needle tube to form the transition section.

[0010] Furthermore, the wall of the second needle tube is cut through along the spiral direction to form the transition section;

[0011] At least two sealing structures are arranged between the first needle tube and the second needle tube, and the two sealing structures are respectively located at two ends of the transition section.

[0012] Furthermore, the pitches of the segments on the first segment are the same, and the pitches of the segments on the third segment are the same; or, the pitches of the segments on the first segment decrease in sequence in the direction toward the second segment;

[0013] The pitch of each segment on the third segment decreases gradually in the direction toward the second segment.

[0014] Furthermore, the outer diameter distribution of the first segment body gradually decreases along the direction toward the second segment body, and the outer diameter distribution of the third segment body gradually decreases along the direction toward the second segment body.

[0015] Furthermore, the first needle tube and the second needle tube are fixedly connected via the sealing structure.

[0016] Further, the first needle tube comprises an inner needle body and a needle tip, the inner needle body is sleeved in the second needle tube, and the needle tip is fixed at the front end of the inner needle body and extends out of the second needle tube to form the tip;

[0017] The mounting channel is arranged on the inner side of the inner needle body.

[0018] 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;

[0019] The rear end surface of the needle tip is sealed and fixedly connected to the front end surface of the second needle tube.

[0020] According to another aspect of the present application, a method for preparing a puncture needle is provided, comprising the following steps:

[0021] Providing a first needle tube, wherein the front end of the first needle tube has a sharp tip, and the inner side of the first needle tube has a hollow installation channel, wherein the installation channel is used to install a navigation sensor;

[0022] A second needle tube is prepared, and a spiral transition section is formed on the hollow needle tube, wherein the transition section comprises a first section body, a second section body and a third section body connected in sequence, and the pitches of the first section body and the third section body are both greater than the pitch of the second section body;

[0023] The second needle tube is sleeved on the first needle tube and fixed, and the tip is located at the front end of the second needle tube.

[0024] Further, forming a spiral transition section on the hollow needle tube includes:

[0025] Performing spiral cutting along the axial direction of the needle tube according to a first feed amount to form a first section;

[0026] Performing spiral cutting from the end of the first segment along the axial direction of the needle tube according to a second feed amount to form a second segment;

[0027] Performing spiral cutting from the end of the second segment along the axial direction of the needle tube according to a third feed amount to form a third segment;

[0028] The second feed amount is smaller than the first feed amount and the third feed amount.

[0029] In the embodiment of the present invention, a first needle tube is provided, the front end of the first needle tube is provided as a closed tip, an installation channel is provided on the inner side of the first needle tube, and the installation channel is used to install a navigation sensor; a second needle tube, the second needle tube is sleeved on the outer side of the first needle tube, the tip is located at the front end of the second needle tube, the second needle tube includes a transition section, the transition section is provided in a spiral shape, and the transition section is located at a position where the second needle tube bends during the intervention process; the transition section includes a first section body, a second section body and a third section body connected in sequence, the pitch of the first section body and the third section body are both greater than the pitch of the second section body, on the one hand, the navigation sensor can be installed by using the installation channel in the needle body, and puncture navigation can be performed during the puncture process, thereby achieving the technical effect of improving the accuracy of the puncture operation, thereby solving the problem in the related art that the puncture needle cannot be matched with a navigation device for navigation during the puncture process;

[0030] On the other hand, the position where the needle body will bend is set as a spiral transition section, so that the transition section is easier to bend than other parts of the needle body, thereby increasing the passing performance of the puncture needle in the curved tube, and having better resilience performance, and not easily breaking when bending, thereby solving the problem that the puncture needle in the related art is not easy to bend and is easy to break when bending;

[0031] On the other hand, by adjusting the pitch of different segments on the transition section, the stress of the transition section during bending deformation is transferred from the end of the transition section to the middle area with a smaller pitch, thereby preventing the connection between the end of the transition section and the second needle tube from being damaged by excessive stress during bending. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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:

[0033] Figure 1 is a schematic structural diagram of a puncture needle according to an embodiment of the present invention;

[0034] Figure 2 is a schematic cross-sectional structural diagram of a puncture needle according to an embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of a partial cross-sectional structure of a puncture needle according to an embodiment of the present invention;

[0036] Figure 4 is a schematic diagram of a partial structure of a puncture needle according to an embodiment of the present invention;

[0037] Figure 5 is a schematic diagram of a partially enlarged structure of a puncture needle according to an embodiment of the present invention;

[0038] Figure 6 is a schematic diagram of stress transfer according to an embodiment of the present invention;

[0039] Figure 7 is a schematic flow chart of a method for preparing a puncture needle according to an embodiment of the present invention;

[0040] Among them, 1 is a first needle tube, 2 is a second needle tube, 20 is a transition section, 201 is a first section body, 202 is a second section body, 203 is a third section body, 3 is a mounting channel, 4 is a tip, 401 is a needle tip, 402 is a boss, 5 is a sealing structure, and 6 is a needle body. DETAILED DESCRIPTION

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] In addition, the term "plurality" shall mean two or more.

[0047] 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.

[0048] To solve relevant technical problems, such as Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a puncture needle, comprising:

[0049] A needle body 6, wherein the front end of the needle body 6 is configured as a closed tip 4, and a hollow installation channel 3 is provided in the needle body 6, and the installation channel 3 is used for installing a navigation sensor;

[0050] The needle body 6 includes a transition section 20, which is configured in a spiral shape. The transition section 20 is located at a position where the needle body 6 bends during the intervention process.

[0051] In this embodiment, the front end of the needle body 6 is closed and has a tip 4, through which puncture can be performed. There is an installation channel 3 in the needle body 6, the front end of the installation channel 3 is closed, and the rear end has an opening. The navigation sensor can be installed from the opening at the rear end of the installation channel 3 and penetrate into the front end of the installation channel 3 to approach the tip 4 of the needle body 6. Different navigation sensors can be installed according to different navigation methods. In one embodiment, the navigation sensor can be an electromagnetic navigation sensor, which can locate the spatial position of the puncture needle during the puncture process by cooperating with an external navigation device, thereby improving the accuracy of the puncture operation, so as to solve the problem in the related art that the puncture needle cannot be matched with the navigation device for navigation during the puncture process.

[0052] To facilitate the bending and rebound of the needle body 6, a transition section 20 is provided on the needle body 6 in the present 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 consistent with the position on the needle body 6 where bending will occur during the intervention process. In the present embodiment, the transition section 20 is arranged in a spiral shape.

[0053] like Figure 1 As shown, in one embodiment, the needle body 6 is a needle, and a groove can be cut on the outer wall of the needle, and the groove extends along the axial direction of the needle to form a spiral transition section 20. The depth of the groove can be less than the wall thickness of the needle, so that the groove is not connected to the installation channel 3, thereby preventing blood from entering the installation channel 3 during the intervention process and affecting the navigation sensor. In this embodiment, since only the groove is provided on the outer wall of the needle, the depth of the groove does not extend to the installation channel, so there is no need to seal between the groove and the installation channel, and the needle is guaranteed to have sufficient structural strength.

[0054] In another embodiment, a needle tube can be sleeved on a complete needle to form a needle body 6, and a mounting channel is provided in the needle. A spiral transition section 20 is formed by cutting at a position on the needle tube where a bend is produced. Since the needle tube is sleeved on the outside of the needle in this embodiment, the needle tube is isolated from the mounting channel 3 in the needle, so when cutting on the needle tube, the wall of the needle tube can be penetrated, but of course, the wall of the needle tube can also be not penetrated. In this embodiment, the diameter of the needle can be made smaller, and it is difficult to directly open a groove on the outer wall of the needle, and it affects the strength of the needle. After the needle tube is sleeved on the needle, by cutting on the needle tube to form a spiral transition section, it can be ensured that the needle body as a whole has sufficient bending performance and can also protect the needle.

[0055] In addition, it should be noted that the specific configuration of the transition section 20 is not limited in this embodiment, and those skilled in the art may design it according to actual conditions.

[0056] After the spiral transition section 20 is formed on the needle body 6 in this embodiment, firstly, it is easier to bend at the position of the transition section 20, which increases the passing performance of the puncture needle in the curved tube and has better resilience. At the same time, it is not easy to break when bending, thereby solving the problem that the puncture needle is not easy to bend and is easy to break when bending in the related art. Secondly, when the transition section 20 is a part of the needle body 6 or a part of the outer needle tube, the transition section 20 is not easy to break at the connection position with the two ends during the bending process, thereby improving the safety of use.

[0057] like Figure 3 to Figure 4 As shown, in one embodiment of the needle body 6, in order to reduce the difficulty of processing and ensure the mechanical properties of the puncture needle, the needle body 6 in this embodiment includes:

[0058] A first needle tube 1, wherein the front end of the first needle tube 1 is configured as a closed tip 4, and a hollow installation channel 3 is provided inside the first needle tube 1, and the installation channel 3 is used to install a navigation sensor;

[0059] A second needle tube 2, 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;

[0060] The second needle tube 2 includes a transition section 20, which is arranged in a spiral shape. Both ends of the transition section 20 are fixedly connected to the first needle tube 1, and the transition section 20 is the position where the second needle tube 2 is bent during the intervention process.

[0061] In this embodiment, the puncture needle includes a first needle tube 1 and a second needle tube 2 which are connected inner and outer respectively. The first needle tube 1 and the second needle tube 2 are both hollow structures, wherein the first needle tube 1 is fixedly connected to the inner side of the second needle tube 2, and the first needle tube 1 has a hollow installation channel 3. When puncture navigation is required, a navigation sensor can be installed in the installation channel 3.

[0062] To achieve puncture, a tip 4 is provided at the front end of the first needle tube 1. The tip 4 may be a part of the first needle tube 1 or a structure independently installed at the front end of the first needle tube 1, which is not limited in this embodiment.

[0063] The second needle tube 2 is sleeved and fixed on the outside of the first needle tube 1. The second needle tube 2 serves as a protective structure for the first needle tube 1 and can prevent the first needle tube 1 from breaking during the bending process. Figure 4 As shown, the second needle tube 2 has a transition section 20, the front end of the transition section 20 is a 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 elbow, in one embodiment, the front end of the transition section 20 is 9 mm away from the front end of the second needle tube 2, and the length of the transition section 20 is 80 mm. In this embodiment, there is no limitation on the specific position and length of the transition section 20, and those skilled in the art can design it according to actual needs.

[0064] like Figure 4 As shown, in order to facilitate the bending and rebound of the second needle tube 2, the transition section 20 in this embodiment is set to be spiral. Specifically, the spiral transition section 20 can be formed by cutting the hollow second needle tube 2 in the spiral direction, and the cutting depth can be less than the thickness of the second needle tube 2, so as to form a groove that does not penetrate the tube wall of the second needle tube 2. In order to further increase the deformability of the transition section, the cutting depth can be equal to the thickness of the second needle tube 2, so as to penetrate the tube wall of the second needle tube 2. After penetration, blood will enter the area between the transition section 20 and the first needle tube 1 through the gap on the transition section 20 during the puncture process. In order 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 the two ends of the transition section 20 and the first needle tube 1 to isolate blood flow.

[0065] Since the spiral transition section 20 in the present embodiment is a 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 the connection strength between the two ends of the spiral winding wire and the needle body in the related art. It is not easy to break or crack during the bending process, which improves the safety of the puncture needle. It solves the problem that the puncture needle in the related art cannot be used with a navigation device for navigation during the puncture process, and the welding point position of the transition section 20 and the puncture needle is subjected to greater force during the bending process, which is easy to desolder and causes the transition section 20 to collapse.

[0066] In summary, on the one hand, the present invention utilizes the installation channel 3 in the first needle tube 1 to install a navigation sensor, and can perform puncture navigation during the puncture process, thereby achieving the technical effect of improving the accuracy of the puncture operation, and further solving the problem that the puncture needle in the related art cannot be used with the navigation equipment for navigation during the puncture process; on the other hand, a part of the second needle tube 2 is formed into a spiral transition section 20, and the transition section 20 and the second needle tube 2 are an integrated structure, thereby increasing the connection strength between the transition section 20 and the second needle tube 2, and it is not easy to break or crack when the transition section 20 is bent, thereby improving the technical effect of the safety of the puncture needle, and further solving the problem that the puncture needle in the related art cannot be used with the navigation equipment for navigation during the puncture process, and the welding point position of the transition section made of wire winding and the puncture needle is subjected to large force during the bending process, which is easy to desolder and causes the transition section 20 to collapse.

[0067] On the basis that the transition section 20 of the second needle tube 2 is cut into a spiral structure, the overall pitch of the transition section 20 has a variety of distribution modes. In one embodiment, the pitches of the segments on the transition section 20 are the same, and in another embodiment, the pitches of some segments on the transition section 20 are the same, and the pitches of some segments are different.

[0068] When the pitches of the various segments on the transition section 20 are the same, when the transition section 20 is bent, the stress is concentrated at the end of the transition section 20, that is, the starting point of the spiral on the transition section 20. At this time, the transition section 20 is prone to deformation and breakage at the end after bending. To this end, the pitch of the transition section 20 is further adjusted in this embodiment, specifically, as Figure 4 As shown, the transition section 20 includes a first section 201 , a second section 202 and a third section 203 which are connected in sequence, and the pitches of the first section 201 and the third section 203 are greater than the pitch of the second section 202 .

[0069] 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 the two ends, the second segment 202 is more likely to bend and deform than the first segment 201 and the third segment 203. Therefore, when the transition segment 20 is bent, the stress is transferred from the connection position between the first segment 201 and the second needle tube 2 to the second segment 202 (such as Figure 6 As shown, the transition section 20 is transferred from the starting position A of the spiral to the position B near the middle), thereby making it less likely for the transition section 20 to deform and break when bent, and still maintaining a sufficient rebound effect.

[0070] In addition, since the third segment 203 is relatively closer to the tip 4 of the puncture needle, the third segment 203 also needs to have sufficient support performance to facilitate the control of the tip 4 of the puncture needle. To this end, in this embodiment, the pitch of the third segment 203 is also greater than the pitch of the second segment 202, so that the third segment 203 has a certain bending ability while ensuring sufficient support stability to facilitate the control of the movement of the tip 4 of the puncture needle.

[0071] Furthermore, in this embodiment, when the transition section 20 has an unequal pitch distribution, the smoothness of the needle body 6 in passing through the bending tube at various angles is increased.

[0072] To ensure sufficient bending performance and stress transfer effect, in one embodiment, the pitch of the second segment 202 is one third to one half of the pitch of the first segment 201. Of course, this is not restrictive, and those skilled in the art can adjust it according to actual needs.

[0073] 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 have at least two structural forms. Figure 4 As shown, in one embodiment, the pitch of each segment on the first segment 201 is the same, that is, the first segment 201 is a spiral structure with equal pitch, and the pitch of each segment on the third segment 203 is the same, that is, the third segment 203 is also a spiral structure with equal pitch. In this embodiment, the pitch of the first segment 201 and the third segment 203 can be 2mm, and the pitch of the second segment 202 can be 1mm. Of course, this is not restrictive, and those skilled in the art can adjust it according to actual needs.

[0074] In another embodiment, the pitch of each segment on the first segment 201 decreases gradually in the direction toward the second segment 202 , and the pitch of each segment on the third segment 203 decreases gradually in the direction toward the second segment 202 .

[0075] When adjusting the pitch of each segment on the transition section 20 for the purpose of stress transfer and support strength, computer software can be used for kinematic simulation to design a pitch change that meets the requirements, which will not be described in detail in this embodiment.

[0076] In addition, it should be noted that the transition section 20 on the second needle tube 2 can be set as a section structure with a constant diameter or a section structure with a variable diameter. When the diameter is variable, the outer diameter distribution of the first section body 201 in the transition section 20 gradually decreases in the direction toward the second section body 202, and the outer diameter distribution of the third section body 203 gradually decreases in the direction toward the second section body 202.

[0077] like Figure 5 As shown, in an embodiment of achieving sealing between the two ends of the transition section 20 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, and the two sealing structures 5 are respectively located at the two ends of the transition section 20. In this embodiment, the two sealing structures 5 can be close to the spiral starting end and the spiral ending end of the transition section 20, and of course, they can also be a distance away from the spiral starting end and the spiral ending end of the transition section 20. The sealing structure 5 can be a sealing ring sleeved on the first needle tube 1 or a sealing filler filled between the first needle tube 1 and the second needle tube 2, etc., which is not limited in this embodiment.

[0078] In order to further strengthen the connection strength 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 by the sealing structure 5, that is, the two ends of the transition section 20 are fixedly connected to the first needle tube 1 by the sealing structure 5. In other words, in this embodiment, the sealing structure 5 plays the role of sealing the two ends of the transition section 20 and the first needle tube 1, and also plays the role of connecting the end of the transition section 20 and the first needle tube 1. In this embodiment, the sealing structure 5 can be a welding structure between the first needle tube 1 and the second needle tube 2, or an adhesive provided between the first needle tube 1 and the second needle tube 2.

[0079] 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 in the second needle tube 2, the needle tip 401 is fixed at 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.

[0080] Specifically, in this embodiment, the needle body has a hollow cavity to form the installation channel 3, the rear end portion of the needle tip 401 is sleeved in the installation channel 3 and fixedly connected, 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 installed from the rear end of the installation channel 3 and extends along the installation channel 3 to the front end, so that the navigation sensor is relatively close to the needle tip 401, thereby facilitating accurate positioning and navigation of the needle tip 401 during the puncture process.

[0081] It is understandable that, in addition to being formed by installing the needle tip 401 on the inner needle body, the first needle tube 1 can also be formed by processing a hollow stainless steel tube. Specifically, before the hollow stainless steel tube is processed, the hollow cavity inside serves as the installation channel 3 for installing the navigation sensor, the front end of the hollow cavity is a closed structure, the rear end is an open structure, and there is a solid section at the front end of the stainless steel tube, and the tip 4 is formed by grinding the solid section.

[0082] Since the outer side of the first needle tube 1 needs to be sleeved with the second needle tube 2, when the tip 4 is directly processed on the front end of the first needle tube 1, a step surface will be formed between the second needle tube 2 sleeved with the first needle tube 1 and the tip 4, which is not conducive to puncture. If the step surface is to be eliminated, the part of the first needle tube 1 except the tip 4 needs to be thinned, and the degree of thinning is 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 sleeved with 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, it is difficult to thin the first needle tube 1 and the process is complicated.

[0083] Therefore, in order to facilitate puncture and processing, such as Figure 3 As shown, in this embodiment, it is preferred that the needle tip 401 is installed on the inner needle body to form the first needle tube 1. In addition, a boss 402 is provided at the rear end of the needle tip 401, and a step surface is formed between the boss 402 and the rear end face of the needle tip 401, and the boss 402 is coaxially arranged with the needle tip 401. When the needle tip 401 is installed, the boss 402 is inserted into the installation channel 3, and 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, and the rear end face of the needle tip 401 is against the front end face of the inner needle body and the front end face of the second needle tube 2, so that after the needle tip 401 is installed, its rear end can be flush with the surface of the second needle tube 2.

[0084] 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 by welding the rear end of the needle tip 401 to the front end of the second needle tube 2 or filling with sealant, etc. The specific sealing method is not limited in this embodiment.

[0085] like Figure 7 According to another aspect of the present application, a method for preparing a puncture needle is provided, comprising the following steps:

[0086] A needle body 6 is provided, wherein the front end of the needle body 6 has a closed tip 4, and the inside of the needle body 6 has a hollow installation channel 3, and the installation channel 3 is used to install the navigation sensor;

[0087] According to the bending position of the needle body 6 during the intervention process, cutting is performed at the bending position of the needle body 6 to form a spiral transition section 20 .

[0088] In this embodiment, the needle body 6 can be a hollow needle, and during processing, a spiral groove can be cut at a position where the needle will bend by laser cutting to form a transition section 20. Since the installation channel in the needle needs to install a navigation sensor, the cutting depth needs to be controlled during cutting to prevent the groove from penetrating the wall of the needle. Of course, the spiral groove can also be formed by etching, and the specific groove processing method is not limited in this embodiment.

[0089] 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:

[0090] S10. Providing a first needle tube 1, the front end of the first needle tube 1 has a tip 4, the inner side of the first needle tube 1 is provided with a hollow mounting channel 3, the mounting channel 3 is used to install the navigation sensor;

[0091] S20. Prepare a second needle tube 2, and form a spiral transition section 20 on the hollow needle body, wherein the transition section 20 comprises a first segment 201, a second segment 202 and a third segment 203 connected in sequence, wherein the pitch of the first segment 201 and the third segment 203 are both greater than the pitch of the second segment 202;

[0092] S30. The second needle tube 2 is sleeved on the first needle tube 1 and fixed, with the tip 4 located at the front end of the second needle tube 2.

[0093] In this embodiment, the first needle tube 1 can be a prefabricated needle body, which should be structurally provided with a tip 4 at the front end of the needle body for puncture, and a hollow installation channel 3 inside the needle body for installation of a navigation sensor (e.g., an electromagnetic navigation sensor). Of course, it is understandable that the first needle tube 1 also has differences in prefabrication processes when using different structural forms. In this embodiment, it is preferred that the first needle tube 1 includes an inner needle body and a needle tip 401, and the rear end of the needle tip 401 is formed into a coaxial boss 402 by a grinding process. The inner needle body is a hollow tubular structure, and the installation channel 3 is formed by a hollow cavity. During assembly, the boss 402 at the rear end of the needle tip 401 can be inserted into the installation channel 3 and fixed. In the fixing method, the boss 402 can be realized by interference fit with the front end of the installation channel 3 or by coating adhesive on the boss 402, etc., which is not limited in this embodiment.

[0094] For the second needle tube 2, a hollow stainless steel tube can be used as the needle body, and then the bending position of the needle body during the puncture process is determined according to the position of the bend, 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 about 9 mm away from the front end of the needle body, and the length of the transition section 20 is about 80 mm. After determining the position of the transition section 20, cutting is performed along the circumference of the needle body to form a spiral transition section 20. The cutting method can be laser cutting. Laser cutting has the advantages of high cutting accuracy and easy control. Since it is necessary to cut out the spiral transition section 20, the needle body can be controlled to rotate during the feeding process during the cutting process, or the laser emitting end can be controlled to rotate and the needle body can be fed linearly, etc., which is not limited in this embodiment.

[0095] After the transition section 20 is cut, the second needle tube 2 is sleeved on the first needle tube 1 and fixed. The tip 4 on the first needle tube 1 needs to extend beyond the front end of the second needle tube 2 for easy puncture. To prevent blood from seeping into the gap between the first needle tube 1 and the second needle tube 2 during fixation, both ends of the transition section 20 need to be sealed.

[0096] like Figure 5 As shown, in a sealing method, two welding points can be formed between the first needle tube 1 and the second needle tube 2, and the two welding points are located at the two ends of the transition section 20. The two welding points form a fixed connection structure between the first needle tube 1 and the second needle tube 2, and a sealing structure 5 at both ends of the transition section 20. It can be understood that two glue points can also be arranged on the first needle tube 1, and the two glue points are located at the two ends of the transition section 20. The first needle tube 1 and the second needle tube 2 are bonded and fixed by the two glue points, and the sealing structure 5 at both ends of the transition section 20 is formed at the same time.

[0097] In addition, it should be noted that for the embodiment in which the needle body includes a first needle tube and a second needle tube, in order to transfer the bending stress from the starting end of the spiral to the middle area of ​​the spiral, the transition section 20 is a spiral structure with a variable pitch. Therefore, when cutting, the feed amount needs to be changed and controlled to cut a spiral structure that meets the designed pitch.

[0098] In one embodiment, cutting the hollow needle tube to form the spiral transition section 20 includes:

[0099] Performing spiral cutting along the axial direction of the needle tube according to a first feed amount to form a first segment 201;

[0100] The second segment 202 is formed by spirally cutting from the end of the first segment 201 along the axial direction of the needle tube according to the second feed amount;

[0101] A third segment 203 is formed by spirally cutting from the end of the second segment 202 along the axial direction of the needle tube according to a third feed amount;

[0102] The second feed amount is smaller than the first feed amount and the third feed amount.

[0103] Specifically, in this embodiment, the transition section 20 is divided into a first section 201, a second section 202, and a third section 203 which are connected in sequence. The first section 201 and the third section 203 may be spiral structures with equal pitches, and the second section 202 may also be a spiral structure with equal pitches, and the pitch of the second section 202 is smaller than the pitch of the first section 201 and the third section 203. When preparing the transition section 20, the feed amount needs to be reduced after the first section 201 is cut by feeding at the first feed amount, and the second section 202 is cut by feeding at the second feed amount. After the second section 202 is cut, the feed amount needs to be increased and the third feed amount needs to be fed to cut the third section 203.

[0104] When the needle body includes only one needle, the process of cutting at the bending position of the needle body 6 to form the spiral transition section 20 is similar, and will not be described in detail in this embodiment.

[0105] The embodiment of the present invention also provides a specific implementation of a puncture system based on electromagnetic positioning, including the puncture 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 puncture needle and the second electromagnetic navigation sensor, and determine the spatial position relationship between the puncture needle and the ultrasound probe based on the electromagnetic signals.

[0106] 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 puncture needle, characterized in that: include: a first needle tube, wherein the front end of the first needle tube is configured as a closed tip, and an installation channel is provided on the inner side of the first needle tube, and the installation channel is used to install a navigation sensor; A second needle tube, the second needle tube is sleeved on the outside of the first needle tube, the tip is located at the front end of the second needle tube, the second needle tube includes a transition section, the second needle tube cuts through the tube wall of the second needle tube along a spiral direction to form the transition section, the transition section is set in a spiral shape, and the transition section is located at a position where the second needle tube is bent during the intervention process; The transition section comprises a first section, a second section and a third section connected in sequence, and the pitches of the first section and the third section are both greater than the pitch of the second section; The pitch of each segment on the first segment decreases in sequence in the direction toward the second segment; The pitch of each segment on the third segment decreases in sequence along the direction toward the second segment.

2. The puncture needle according to claim 1, characterized in that: At least two sealing structures are arranged between the first needle tube and the second needle tube, and the two sealing structures are respectively located at two ends of the transition section.

3. The puncture needle according to claim 1, characterized in that: The outer diameter distribution of the first segment body gradually decreases along the direction toward the second segment body, and the outer diameter distribution of the third segment body gradually decreases along the direction toward the second segment body.

4. The puncture needle according to claim 2, characterized in that: The first needle tube and the second needle tube are fixedly connected via the sealing structure.

5. The puncture needle according to claim 1, characterized in that: The first needle tube comprises an inner needle body and a needle tip, the inner needle body is sleeved in 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 mounting channel is arranged on the inner side of the inner needle body.

6. The puncture needle according to claim 5, characterized in that: A boss is provided at the rear end of the needle tip, the boss is inserted into the installation channel, and the rear end surface of the needle tip abuts against the front end surface of the inner needle body and the front end surface of the second needle tube; The rear end surface of the needle tip is sealed and fixedly connected to the front end surface of the second needle tube.

7. A method for preparing a puncture needle, characterized in that: The method for preparing the puncture needle according to any one of claims 1 to 6 comprises the following steps: Providing a first needle tube, wherein the front end of the first needle tube has a sharp tip, and the inner side of the first needle tube has a hollow installation channel, wherein the installation channel is used to install a navigation sensor; A second needle tube is prepared, and a spiral transition section is formed on the hollow needle tube, wherein the transition section comprises a first section body, a second section body and a third section body connected in sequence, and the pitches of the first section body and the third section body are both greater than the pitch of the second section body; The second needle tube is sleeved on the first needle tube and fixed, and the tip is located at the front end of the second needle tube.

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