Percutaneous puncture recoverable expansion device for non-lumen structure

Abstract

The invention relates to the technical field of medical instruments, and provides a percutaneous puncture recoverable expansion device for a non-lumen structure. The percutaneous puncture recoverable expansion device for the non-lumen structure comprises a puncture guide assembly, a recoverable support assembly and a recovery clamp. Wherein the puncture guide assembly is used for puncturing non-lumen structures, tissues or gaps, and guiding the recoverable stent assembly to reach an expansion area or be taken out from the expansion area; the recoverable stent assembly is used for expanding surrounding tissues to form a safe puncture channel, an ablation target area and a radiotherapy target area; and the recovery clamp is used for taking out the recoverable stent assembly from the expansion area. According to the percutaneous puncture recoverable expansion device for the non-lumen structure, a stable and safe working space can be provided, permanent implantation can be avoided, operation is easy and convenient, safety and reliability are achieved, and the tissue space expansion requirement of percutaneous puncture surgery of the non-lumen structure is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, in particular to a percutaneous puncture recoverable expansion device for non-lumen structure. BACKGROUND

[0002] In percutaneous puncture tumor ablation (radiofrequency, microwave, cryosurgery, etc.), radioactive particle implantation or brachytherapy surgery, it is often necessary to place an ablation probe into the target tissue. In order to ensure the repeated passage of the instrument and protect the surrounding tissue of the puncture path, accurately delineate the radiotherapy target area to reduce the damage to the surrounding tissue, there are various technical means for assisting expansion or isolation in clinical practice, such as recoverable full-covered metal stents suitable for lumen structure; In some cases, percutaneous puncture dilators or injection of physiological saline, air, etc. are used to open the tissue gap or protect the surrounding structure; There is also a kind of swelling device based on hydrogel, which can increase the volume by absorbing liquid, thereby supporting the tissue.

[0003] The existing auxiliary expansion or isolation technology has many deficiencies in actual application. Permanent implants are prone to foreign body residue and may be displaced, affecting subsequent imaging follow-up, and there is a risk of causing potential long-term complications. Disposable dilators often cause difficulty in removal due to tissue elastic recoil, and such devices cannot meet the needs of multiple radiotherapy and other scenarios requiring fractionated treatment. The swelling speed of the hydrogel swelling device is slow, it is difficult to quickly form a stable support, and its radial support force is also limited, and it is prone to residual problems after use.

[0004] From the above background technology, it can be seen that in the field of expansion of non-lumen structure or tissue gap, there is currently no mature, safe and reliable expansion device, which brings many inconveniences to clinical operation. SUMMARY

[0005] Therefore, the present application aims to provide a percutaneous puncture recoverable expansion device for non-lumen structure, which can provide a stable and safe working space, avoid permanent implantation, is easy to operate, safe and reliable, and meets the needs of tissue gap expansion in percutaneous puncture surgery of non-lumen structure.

[0006] To achieve the above purpose, the technical scheme of the present application is as follows: A percutaneous puncture recoverable expansion device for non-lumen structure, comprising: a puncture guide assembly for puncturing non-lumen structure, tissue or gap, and guiding the recoverable stent assembly to reach the expansion area or remove it from the expansion area; a recoverable stent assembly for opening the surrounding tissue to form a safe puncture channel, ablation target area, radiotherapy target area; A retrieval forceps for removing the retrievable stent assembly from the dilation zone.

[0007] Further, the puncture guide assembly comprises: A coaxial sheath tube; A puncture needle core slidably arranged in the coaxial sheath tube; The coaxial sheath tube has scale lines evenly arranged along its length, with a length of 70mm, 110mm or 150mm, and a tube diameter of 9G, 11G, 13G, 15G or 17G; the puncture needle core has a gripping portion at both ends for gripping and a puncture portion for puncturing, with a diameter of 10G, 12G, 14G, 16G or 18G.

[0008] Further, the puncture portion is a sharp puncture needle core or a blunt puncture needle core.

[0009] Further, the retrievable stent assembly comprises: A delivery rod; A mesh stent arranged on the delivery rod; A delivery sheath tube arranged on the delivery rod and covering the outside of the mesh stent to limit the mesh stent.

[0010] Further, the mesh stent is a variable-diameter elastic stent, and an end of the mesh stent close to the operator is provided with a retrieval portion for diameter reduction, which is a retrieval wire or a retrieval ring.

[0011] Further, the mesh stent is provided with a micro barb at the mesh nodes at both ends, and / or After the mesh stent is naturally expanded, the diameter of at least one end is greater than the diameter of the middle main body portion, and / or The surface of the mesh stent is provided with a coating film having a treated rough surface.

[0012] Further, the mesh stent is made of bioabsorbable material.

[0013] Further, the retrieval forceps comprises An operating portion; A forceps body connected to the operating portion at one end; A chuck arranged at one end of the forceps body away from the operating portion and capable of being clamped or released under the control of the operating portion.

[0014] Further, the diameter of the forceps body is consistent with the puncture needle core, which is 10G, 12G, 14G, 16G or 18G.

[0015] Further, the chuck is a double-claw forceps.

[0016] Compared with the prior art, the percutaneous puncture recoverable expansion device for non-lumen structure has the following advantages: (1) The puncture guide assembly for puncturing and guiding the recoverable stent assembly, the recoverable stent assembly for distracting the surrounding tissue to form a safe ablation or radiotherapy target area, and the recovery forceps for taking out the recoverable stent assembly from the expansion area are arranged, so that a temporary safe operation area is established in the percutaneous puncture interventional operation of the non-lumen structure, the stent can be completely recovered after the operation, foreign matter is avoided to remain.

[0017] (2) The puncture guide assembly comprises a coaxial sheath tube and a puncture needle core slidably arranged in the coaxial sheath tube, the coaxial sheath tube has lengthwise scale lines on the surface, has a length and a pipe diameter suitable for different scenes, the puncture needle core has a holding part and a puncture part at two ends and has a suitable diameter, so that the puncture depth is accurately controlled, the puncture requirement of different non-lumen structures is met, the operator is facilitated to hold and limit the relative position of the puncture needle core and the coaxial sheath tube.

[0018] (3) The puncture part of the puncture needle core is arranged as a conical sharp needle core or an arc-shaped blunt needle core, so that the appropriate puncture structure is selected according to the tissue characteristics of the puncture path, the puncture efficiency is improved when it is necessary to quickly break through the tissue, and the risk of tissue damage is reduced when it is close to sensitive tissue.

[0019] (4) The recoverable stent assembly is arranged as a structure composed of a delivery rod and a mesh stent sleeved on the delivery rod, and a delivery sheath tube sleeved on the delivery rod and covering the outside of the mesh stent, so that the mesh stent is stably constrained in a compressed state to be smoothly delivered to the target position, and the mesh stent is accurately expanded by releasing the constraint through the withdrawal of the delivery sheath tube.

[0020] (5) The mesh stent adopts a variable-diameter elastic stent, and a recovery part in the form of a recovery wire or a recovery ring is arranged at the end close to the operator, so that the mesh stent can pass through the puncture channel, expand elastically to distract the tissue after reaching the target position, and be conveniently reduced in diameter and taken out after the operation.

[0021] (6) Miniature barbs are arranged at the mesh nodes at both ends of the mesh stent, at least one end of the mesh stent has a diameter greater than that of the middle body after the mesh stent is naturally expanded, or a rough surface film is arranged on the surface of the mesh stent, so that the anchoring stability of the mesh stent in the tissue is enhanced to prevent displacement during the operation, the difficulty of recovery is reduced by avoiding the growth of tissue into the mesh of the stent, and the operation channel is smooth and regular.

[0022] (7) The mesh stent is made of a bioabsorbable material, so that the mesh stent can be gradually degraded in the body after completing the tissue expansion task, does not need to be punctured and taken out again, the degradation products are harmless to the human body, and there is no long-term foreign matter residue.

[0023] (8) The recycling forceps comprises an operation part, a forceps body connected to one end of the operation part, and a clamp head arranged at the other end of the forceps body and capable of being clamped or loosened under the control of the operation part, so that the operator can accurately control the action of the clamp head through the operation part, and the forceps body transmits the action force to stably grasp the recyclable stent assembly and smoothly complete the stent recycling operation.

[0024] (9) The diameter of the forceps body of the recycling forceps is consistent with the diameter of the puncture needle core, so that the recycling forceps can be adapted to the puncture channel formed by the puncture guide assembly, the target position can be reached without the need for additional expansion of the channel, the secondary damage to the tissue around the puncture path is reduced, and the smoothness of the recycling operation is improved.

[0025] (10) The clamp head of the recycling forceps is arranged as a split double-claw forceps, so that the clamp head can stably clamp the recycling part of the recyclable stent assembly, avoid falling off during the grasping process, and be adapted to different forms of recycling parts such as recycling lines or recycling rings. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which form a part of the present application, are intended to provide further understanding of the present application, and the illustrative embodiments of the present application and their description serve the purpose of explaining the present application. The accompanying drawings do not constitute an inappropriate limitation on the present application. In the drawings: Figure 1 Structure diagram of the coaxial sheath described in the embodiments of the present application; Figure 2 Structure diagram of the puncture needle core described in the embodiments of the present application; Figure 3 Structure diagram of the recyclable stent assembly described in the embodiments of the present application; Figure 4 Structure diagram of the recyclable stent assembly described in the embodiments of the present application; Figure 5 Structure diagram of the recycling forceps described in the embodiments of the present application; Figure 6 Process diagram of the release of the mesh stent described in the embodiments of the present application; Figure 7 Process diagram of the recycling of the mesh stent described in the embodiments of the present application.

[0027] Explanation of reference signs: 1, puncture guide assembly; 101, coaxial sheath; 102, puncture needle core; 2, recyclable stent assembly; 201, delivery rod; 202, mesh stent; 203, delivery sheath; 3, recycling forceps; 301, operation part; 302, forceps body; 303, clamp head. DETAILED DESCRIPTION

[0028] In order to make the technical solutions of the present application and the advantages thereof clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application and not to limit the present application.

[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0030] In addition, in the description of the present application, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer" and the like appear, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as limiting the devices or elements indicated to have a specific orientation, to be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, if the terms "first", "second" and the like appear, they are also only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0031] In addition, in the description of the present application, unless otherwise explicitly limited, the terms "mount", "connect", "connection", "connector" should be understood broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood in combination with the specific circumstances.

[0032] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples.

[0033] In the following, the present application will be specifically described through exemplary embodiments. However, it should be understood that the elements, structures and features in one embodiment can also be beneficially combined into other embodiments without further description.

[0034] The embodiment of the present application provides a percutaneous puncture recoverable expansion device for non-lumen structure, which is applied to the technical field of medical devices, and is mainly used for providing a safe and stable working space, avoiding permanent implantation, being simple and convenient to operate, safe and reliable, and meeting the interstitial expansion demand of percutaneous puncture surgery of non-lumen structure.

[0035] In the prior art, permanent implants are prone to foreign body residue and displacement, affecting subsequent imaging follow-up, and there is a risk of triggering potential long-term complications. Disposable dilators often cause difficulty in removal due to tissue elastic recoil during the removal process, and such devices cannot meet the needs of multiple radiotherapy and other scenarios requiring fractionated treatment. The expansion speed of hydrogel expansion devices is relatively slow, making it difficult to quickly form stable support, and the radial support force is also limited, and residual problems are prone to occur after use.

[0036] In view of this, in order to overcome the deficiencies in the prior art, the percutaneous puncture recoverable expansion device for non-luminal structure in the embodiment includes a puncture guide assembly 1, a recoverable stent assembly 2 and a recovery forceps 3. Among them, the puncture guide assembly 1 is used for puncturing the non-luminal structure, tissue or gap. Under the guidance of imaging, the puncture guide assembly 1 punctures and is placed at the non-luminal structure, tissue or gap to be expanded, forming a temporary support. Then, the recoverable stent assembly 2 is inserted into the puncture guide assembly 1 and reaches the expansion area under the guidance of the puncture guide assembly 1, expands and forms a safe puncture channel, ablation target area, radiotherapy target area. During the entire operation, the recoverable stent assembly 2 is stably anchored in the non-luminal structure, tissue or gap, and the doctor can repeatedly insert the channel established by it or the safe target area isolated by the stent to perform sufficient ablation or multiple radiotherapy operations. After the local treatment is completed, the recovery forceps 3 is used for recovery operation. Under the guidance of CT or ultrasonic imaging, the recovery forceps 3 passes through the puncture guide assembly 1, clamps the recoverable stent assembly 2, and takes it out from the expansion area to the outside of the body through the puncture guide assembly 1.

[0037] Based on the above overall introduction, specifically, as an exemplary structure form, for the puncture guide assembly 1 in the embodiment, refer to Figure 1 and Figure 2, which comprises a coaxial sheath 101 and a puncture needle core 102. Among them, the coaxial sheath 101 can be a hollow circular tube structure of titanium alloy with higher biocompatibility. The outer surface of the coaxial sheath 101 is provided with a scale line for indicating the insertion length along the length direction of itself by printing or laser engraving. The length of the coaxial sheath 101 can be set to 70mm, 110mm or 150mm and other specifications according to actual use requirements. The pipe diameter of the coaxial sheath 101 can be 9G, 11G, 13G, 15G or 17G. The puncture needle core 102 is arranged in the coaxial sheath 101 by sliding connection, and can slide relative to the coaxial sheath 101 or separate from each other. The two ends of the puncture needle core 102 are a holding part for gripping and a puncture part for puncturing respectively. The diameter of the holding part is slightly larger than the diameter of the coaxial sheath 101, which plays a role in facilitating gripping and limiting the relative position between the puncture needle core 102 and the coaxial sheath 101. The puncture part is used for piercing the body tissue. The diameter of the puncture needle core 102 can be 10G, 12G, 14G, 16G or 18G.

[0038] Above, by the puncture guide assembly 1 comprising the coaxial sheath 101 and the puncture needle core 102 slidably arranged in it, and the coaxial sheath 101 having length direction scale line on the surface, with length and pipe diameter adapting to different scenes, the puncture needle core 102 having holding part and puncture part at two ends respectively and having suitable diameter, the effects of accurately controlling the puncture depth, adapting to different non-lumen structure puncture requirements, facilitating the operator to grasp and limiting the relative position between the puncture needle core 102 and the coaxial sheath 101 are realized.

[0039] In order to balance the puncture efficiency and protect the surrounding tissue of the puncture site, with reference to Figure 2 , the puncture part of the puncture needle core 102 comprises two kinds, which are sharp needle core with tapered tip and blunt needle core with arc-shaped tip respectively. The tapered sharp needle core can more smoothly penetrate different levels of human tissues such as skin, subcutaneous tissue and deep fascia in the puncture operation by virtue of the tapered sharp structure of the end, which is suitable for scenes requiring rapid establishment of initial puncture channel and reduces the extrusion force on the tissue during puncture. The arc-shaped blunt needle core has no sharp edges because of the arc-shaped end, which can effectively reduce the risk of accidental scratching or poking sensitive structures such as blood vessels and nerves when the puncture path is close to these sensitive structures, and is suitable for operation scenes of puncture position adjustment or puncture near sensitive tissue area. The two kinds of puncture part structures can be replaced according to the actual needs of different stages of operation.

[0040] Therefore, by setting the puncture part of the puncture needle core 102 as a tapered sharp needle core or an arc-shaped blunt needle core, the effects of selecting appropriate puncture structure according to the tissue characteristics of the puncture path, improving puncture efficiency when rapid breakthrough of tissue is needed, and reducing tissue damage risk when close to sensitive tissue are realized.

[0041] Based on the purpose of expanding the mesh stent 202 according to the preset shape to achieve tissue gap expansion, in the embodiment, referring to Figure 3 and Figure 4 The recyclable stent assembly 2 includes a delivery rod 201, a mesh stent 202, and a delivery sheath 203. Among them, the delivery rod 201 can be a solid rod made of titanium alloy material, which serves as the basic support structure of the assembly and provides a stable mounting carrier for the mesh stent 202 and the delivery sheath 203, ensuring that the three form a unified assembly whole and avoiding misalignment of the components during operation. The mesh stent 202 is installed on the delivery rod 201 in a sleeved manner. Since its initial state needs to be compressed to adapt to the size of the puncture channel, the delivery sheath 203 is needed to limit it. The delivery sheath 203 is also sleeved on the delivery rod 201 and completely covers the outside of the mesh stent 202. Through its own lumen structure, the mesh stent 202 is constrained in a compressed state, preventing the mesh stent 202 from expanding prematurely due to elastic recovery before reaching the target location, thereby avoiding damage to the tissues along the puncture path or blocking the puncture channel. Referring to Figure 6 When the stent assembly reaches the target location, the mesh stent 202 can be gradually released from the constraint by retracting the delivery sheath 203, allowing the mesh stent 202 to expand according to the preset shape to achieve tissue gap expansion.

[0042] Above, by setting the recyclable stent assembly 2 as a structure composed of the delivery rod 201, the mesh stent 202 sleeved on the delivery rod 201, and the delivery sheath 203 sleeved on the delivery rod 201 and covering the outside of the mesh stent 202, the mesh stent 202 is stably constrained in a compressed state to be smoothly delivered to the target location, and the mesh stent 202 is precisely expanded by releasing the constraint through the retraction of the delivery sheath 203.

[0043] In order to make the mesh stent 202 be smoothly recycled after use, referring to Figure 4 It is made of a variable-diameter elastic material, which has good deformation ability. Before reaching the target location, it can be compressed to a smaller diameter to smoothly pass through the narrow puncture channel; after reaching the target location, it can rely on its own elastic recovery to the preset diameter, thereby supporting the surrounding tissues to form a safe channel or treatment target area. The variable-diameter feature can also adapt to different widths of tissue gaps, avoiding insufficient expansion or excessive pressure on the tissues due to fixed size. A recycling part is provided at the end of the mesh stent 202 close to the operator. The recycling part can be in the form of a recycling line or a recycling ring. By setting the recycling part at the proximal end, the operator can quickly position and contact the recycling part through the recycling tool in clinical operation. The recycling line can gradually reduce the diameter of the mesh stent 202 from the proximal end through the pulling action, and the recycling ring can provide a stable gripping point for the recycling forceps 3 to prevent it from falling off during the gripping process.

[0044] Thus, by adopting a variable diameter elastic stent for the mesh stent 202 and setting a recovery part in the form of a recovery line or a recovery ring at the end close to the operator, the mesh stent 202 can be compressed to pass through the puncture channel, elastically expanded to hold open the tissue after reaching the target position, conveniently reduced in diameter after the operation through the recovery part, and taken out.

[0045] Based on the purpose of improving the posture stability of the mesh stent 202, in the present embodiment, the mesh stent 202 can be provided with one or more structure features for enhancing stability according to the actual clinical needs. The first is to set a micro barb at the mesh nodes at both ends of the mesh stent 202. When the mesh stent 202 is expanded, the micro barb will expand outward and embed into the surrounding tissue, effectively preventing the stent from shifting due to the repeated pushing force of the instrument or the self-peristalsis of the tissue during the operation by increasing the mechanical engagement force of the stent and the tissue; and when the stent needs to be recovered, due to the structural design of the micro barb, it can easily detach from the tissue under the recovery pulling force towards the center of the stent, without causing additional damage to the surrounding tissue. The second is that at least one end of the mesh stent 202 has a diameter larger than the main body diameter of the middle part after natural expansion. This structure can be clamped at both ends of the tissue gap, further enhancing the axial anchoring effect of the stent, avoiding axial sliding of the stent during treatment, while the main body diameter of the middle part remains the size suitable for clinical operation, ensuring that the formed channel meets the instrument passing needs. The third is to set a covering film on the surface of the mesh stent 202, and the surface of the covering film has a rough surface formed by processing. The covering film can be made of a high-molecular material with high friction coefficient and good biocompatibility, such as silicone, polyurethane or ePTFE material. The rough surface can increase the static friction between the stent and the tissue, improve the stability of the stent, and at the same time, the covering film can effectively prevent the tissue from growing into the mesh of the mesh stent 202, avoid the difficulty of stent recovery or tissue tearing during recovery caused by tissue embedding, and ensure the integrity and safety of the stent during recovery.

[0046] By setting a micro barb at the mesh nodes at both ends of the mesh stent 202, making at least one end of the mesh stent 202 have a diameter larger than the main body diameter of the middle part after natural expansion, or setting a covering film with a rough surface on the surface of the mesh stent 202, the anchoring stability of the mesh stent 202 in the tissue is enhanced to prevent displacement during the operation, the tissue is prevented from growing into the mesh of the stent to reduce the difficulty of recovery, and the effect of ensuring smooth operation of the channel is achieved.

[0047] In order to meet the use requirements in different scenes, in the embodiment, the mesh stent 202 can also be processed by using bioabsorbable materials. The bioabsorbable material will gradually degrade into harmless substances without foreign matter residues in the human body, and finally be discharged out of the body with normal metabolism of the human body. The absorption time can be set according to the adjustment of material parameters according to the treatment time. For the case that the stent does not need to be retained for a long time and it is hoped to avoid secondary surgery recovery, the mesh stent 202 made of bioabsorbable material will gradually degrade at a preset speed after supporting to the end of treatment, without the need for the operator to take out by the recovery tool, thereby reducing the pain and surgical risk of the patient caused by secondary puncture to recover the stent.

[0048] Therefore, by using bioabsorbable materials to manufacture the mesh stent 202, the mesh stent 202 can be gradually degraded in the body after completing the tissue expansion task, without the need for secondary puncture to take out, the degradation product is harmless to the human body, and there is no long-term foreign matter residues.

[0049] Based on the purpose of accurately and stably completing the grabbing and releasing of the stent recovery part, with reference to Figure 5 In the embodiment, the recovery forceps 3 include an operation part 301, a forceps body 302, and a chuck 303. The operation part 301 is the control end of the operator, and its structure design needs to be convenient for the operator to hold and exert force, to ensure that the operator can accurately control the action of the chuck 303, and avoid control deviation caused by inconvenient operation. One end of the forceps body 302 is connected with the operation part 301, and the other end is connected with the chuck 303, and its core function is to transmit the control force of the operation part 301. The force applied by the operator to the operation part 301 will be completely transmitted to the chuck 303 through the forceps body 302, and then the chucking or loosening action of the chuck 303 is realized. The chuck 303 is the execution component of the recovery forceps 3, which directly contacts with the recovery part of the recoverable stent assembly 2. With reference to Figure 7 When the recovery part needs to be grabbed, the chuck 303 is controlled to be clamped by the operation part 301, to ensure that a stable connection is formed between the chuck 303 and the recovery part, and to avoid the grabbing from falling off; when the recovery part needs to be released, the chuck 303 is controlled to be loosened.

[0050] The above, by the recovery forceps 3 including the operation part 301, the forceps body 302 connected with one end of the operation part 301, and the chuck 303 arranged at the other end of the forceps body 302 and capable of being clamped or loosened under the control of the operation part 301, the effect that the operator accurately controls the action of the chuck 303 through the operation part 301, and stably grabs the recoverable stent assembly 2 by transmitting the acting force through the forceps body 302, so as to smoothly complete the stent recovery operation is realized.

[0051] In order to avoid the size mismatch from causing the forceps body 302 to jam or block the channel, simplify the recovery operation steps, and improve the recovery efficiency, in the embodiment, with reference to Figure 5, the diameter of the jaw body 302 of the recovery forceps 3 can be 10G, 12G, 14G, 16G or 18G, that is, consistent with the diameter of the puncture needle core 102. Since the puncture needle core 102 is arranged in the coaxial sheath tube 101 of the puncture guide assembly 1 in a sliding manner, its diameter is matched with the inner diameter of the coaxial sheath tube 101, and it can smoothly move in or separate from the coaxial sheath tube 101. The jaw body 302 is consistent in diameter with the puncture needle core 102, which means that the jaw body 302 can also match the inner diameter of the coaxial sheath tube 101. When recovering the stent, the recovery forceps 3 can smoothly reach the target position through the original puncture channel (i.e. the channel formed by the coaxial sheath tube 101), without the need to separately enlarge the puncture channel for the recovery forceps 3 or re-establish a new channel, thereby reducing secondary damage to the tissue around the puncture path. At the same time, the consistency in diameter also ensures the smoothness of the jaw body 302 when moving in the coaxial sheath tube 101, avoiding the jamming or blocking of the channel due to size mismatch.

[0052] Thus, by making the diameter of the jaw body 302 of the recovery forceps 3 consistent with the diameter of the puncture needle core 102, the effect of the recovery forceps 3 being able to adapt to the puncture channel formed by the puncture guide assembly 1, reaching the target position without the need to additionally enlarge the channel, reducing secondary damage to the tissue around the puncture path, and improving the smoothness of the recovery operation is achieved.

[0053] Based on the purpose of ensuring firm grasping and avoiding excessive clamping damage to the recovery part, in the present embodiment, with reference to Figure 5 and Figure 7 , the collet 303 of the recovery forceps 3 adopts a structure of a split double-claw forceps. The split double-claw forceps is composed of two symmetrical lobe-shaped components, and the grasping or releasing of the recovery part is achieved by the relative opening and closing of the two lobe-shaped components. The grasping range of this structure is highly adaptable: for the recovery line of the recoverable stent assembly 2, the two lobe-shaped components can clamp the recovery line from both sides when closed, forming a stable clamping force to prevent the recovery line from slipping off the collet 303 during the pulling process; for the recovery ring, the two lobe-shaped components can be closed after extending into the interior of the recovery ring, or clamped from the outside of the recovery ring, ensuring stable grasping of the recovery ring.

[0054] Above, by setting the collet 303 of the recovery forceps 3 as a split double-claw forceps, the effect of the collet 303 being able to stably clamp the recovery part of the recoverable stent assembly 2, avoiding falling off during grasping, and adapting to different forms of recovery parts such as recovery lines or recovery rings is achieved.

[0055] The above merely describes some embodiments of the present application, and is not intended to limit the present application. The technical features or structures in the foregoing different embodiments can be combined arbitrarily to form other specific technical solutions according to the needs. Various changes and modifications can be made by those skilled in the art based on the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A percutaneously insertable and retrievable dilation device for non-luminal structures, comprising: The application relates to a puncture guide assembly (1) for puncturing a non-lumen structure, tissue or gap and guiding a retrievable stent assembly (2) to or from an expansion area; the retrievable stent assembly (2) for supporting surrounding tissue to form a safe puncture channel, an ablation target area or a radiotherapy target area; and a retrieval forceps (3) for taking out the retrievable stent assembly (2) from the expansion area. The puncture guide assembly (1) comprises: a coaxial sheath tube (101); a puncture needle core (102) slidably arranged in the coaxial sheath tube (101); 2. The percutaneously insertable and retrievable dilation device for non-luminal structures of claim 1, wherein, The coaxial sheath tube (101) has scale lines uniformly arranged along the length direction of the coaxial sheath tube (101), and has a length of 70 mm, 110 mm or 150 mm and a tube diameter of 9G, 11G, 13G, 15G or 17G; the puncture needle core (102) has a holding part at both ends for gripping and a puncture part for puncturing, and has a diameter of 10G, 12G, 14G, 16G or 18G. The puncture part is a conical sharp needle core or an arc-shaped blunt needle core. The retrievable stent assembly (2) comprises: a delivery rod (201); 3. The percutaneously insertable and retrievable dilation device for non-luminal structures of claim 2, wherein, a mesh stent (202) sleeved on the delivery rod (201); 4. The percutaneously insertable and retrievable dilation device for non-luminal structures of claim 1, wherein, a delivery sheath tube (203) sleeved on the delivery rod (201) and wrapped outside the mesh stent (202) to limit the mesh stent (202). The mesh stent (202) is a variable-diameter elastic stent, and one end of the mesh stent (202) close to an operator is provided with a retrieval part for diameter reduction, which is a retrieval wire or a retrieval ring. The mesh nodes at both ends of the mesh stent (202) are provided with micro barbs, and / or After the mesh stent (202) is naturally expanded, the diameter of at least one of the two ends is greater than that of a middle main body part, and / or 5. The percutaneously insertable and retrievable dilation device for non-luminal structures of claim 4, wherein, The mesh stent (202) is made of a bioabsorbable material.

6. The percutaneously insertable and retrievable dilation device for non-luminal structures of claim 4, wherein, The retrieval forceps (3) comprises an operation part (301); a forceps body (302) connected to the operation part (301) at one end; 7. The percutaneously insertable and retrievable dilation device for non-luminal structures of claim 4, wherein, a chuck (303) arranged at one end of the forceps body (302) away from the operation part (301) and capable of being clamped or loosened under the control of the operation part (301).

8. The percutaneously insertable and retrievable dilation device for non-luminal structures of claim 2, wherein, The diameter of the forceps body (302) is consistent with that of the puncture needle core (102), and is 10G, 12G, 14G, 16G or 18G. The chuck (303) is a double-claw forceps. ​ ​ 9. The percutaneously insertable and retrievable dilation device for non-luminal structures of claim 8, wherein, ​ 10. The percutaneously insertable and retrievable dilation device for non-luminal structures of claim 8, wherein, ​

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