Piercer cannula with double tube, balloon piercer cannula and piercer assembly

Abstract

This application belongs to the field of medical device technology and provides a trocar cannula with two tubes, including a base, an outer tube, and an inner tube. The base includes an outer seat, an inner seat, and a tube seat. The outer seat has a first fluid tube, and the inner seat has an opening that communicates with the first fluid tube. The tube seat has a second fluid tube. The interior of the tube seat has two circular steps, one inner and one outer, with an opening at the junction of the two circular steps, communicating with the second fluid tube. The ends of the inner tube and the outer tube are fixed and sealed at different heights on the two circular steps. A certain distance is provided between the inner tube and the outer tube to form a fluid channel with an annular chamber, and the fluid channel communicates with the opening and then with the second fluid tube. This application also provides a balloon trocar cannula, a trocar cannula capable of simultaneously inflating and deflating fluid, and a trocar assembly with a trocar cannula. This application solves the problem that existing trocar cannulas have large overall wall thickness, which easily increases puncture trauma.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and particularly relates to a puncture cannula with two tubes, a balloon puncture cannula, and a puncture device assembly. Background Technology

[0002] The trocar is an indispensable instrument in minimally invasive surgery, especially laparoscopic surgery. Its main function is to penetrate the abdominal wall to create an operating channel for subsequent surgical instruments (such as endoscopes, scissors, forceps, etc.) to enter and exit the abdominal cavity, thus maintaining the operating space required for the surgery.

[0003] In existing technologies, to ensure airtightness during surgery while simultaneously allowing gas to enter and exit, complex fluid channels are typically integrated into the trocar cannula. For example, a common design involves creating a long, narrow channel within the thick wall of the trocar cannula. This design, integrating the fluid channel into the cannula wall, increases the overall wall thickness, affecting puncture performance and increasing the risk of puncture trauma. Furthermore, since the fluid channel is merely a narrow, elongated channel within the trocar cannula wall, the fluid flow is very limited, resulting in low gas flow efficiency.

[0004] It is evident that how to reduce the radial thickness of the cannula to minimize puncture trauma while providing a spacious fluid channel is a pressing technical challenge for medical device manufacturers. Summary of the Invention

[0005] The purpose of this application is to provide a trocar cannula with two tubes, a balloon trocar cannula, and a trocar assembly to solve the technical problems of existing trocar cannula structures, which, due to the integration of the fluid channel into the tube wall, result in an increased overall wall thickness, which easily increases puncture trauma and has low gas flow efficiency.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: In a first aspect, embodiments of this application provide a trocar cannula, comprising: The base includes an outer base, an inner base, and a tube base, which are coaxially arranged and integrally formed from the same material. The outer base is provided with a first fluid tube integrally formed from the same material as the outer base. The inner base has an opening on its side wall, and the opening communicates with the first fluid tube. The tube base is provided with a second fluid tube integrally formed from the same material as the tube base. The inner side wall of the tube base has two circular steps, one inner and one outer. An opening is provided at the connection of the two circular steps, and the opening communicates with the second fluid tube. The inner tube and the outer tube are fixed and sealed at different heights on the two circular steps. A certain distance is provided between the inner tube and the outer tube to form a fluid channel with an annular chamber. The fluid channel is connected to the opening and then to the second fluid tube.

[0007] This allows for thinner wall thicknesses in both the inner and outer tubes, eliminating the need for external fittings to achieve fluid flow. This significantly reduces the overall radial wall thickness of the cannula, minimizing puncture trauma. The fluid channel is formed by an annular chamber between the inner and outer tubes. The equivalent cross-sectional area of ​​this annular chamber is much larger than the narrow channels within traditional tube walls, resulting in more uniform airflow distribution and improved gas flow efficiency.

[0008] In one embodiment, inside the tube seat, the installation position of the inner tube end is higher than the installation position of the outer tube end to form a first height difference. An opening is formed at this first height difference, and the space between the inner and outer tubes at the location of the opening forms the first channel opening of the fluid passage. Thus, the axial height difference between the ends of the inner and outer tubes is used to mate with and seal the inner and outer circular steps inside the tube seat. The first channel opening corresponds precisely to the connection point of the inner and outer circular steps, thereby communicating with the second fluid tube through the opening.

[0009] In one embodiment, the puncture device cannula further includes a locking cap mounted on the outer seat. The inner wall of the outer seat is provided with multiple locking ports and / or several vertical locking slots. The locking cap includes a locking body that mates with the multiple locking ports and / or a vertical locking block that mates with the several vertical locking slots. Thus, the locking cap achieves quick installation and fixation by engaging with the locking ports on the inner wall of the outer seat through the locking body; simultaneously, the engagement of the vertical locking block with the vertical locking slots restricts the circumferential rotational freedom of the locking cap when it is pushed in, thereby providing a guiding function and improving assembly efficiency.

[0010] In one embodiment, the top outer edge of the locking cover is surrounded and flush with the top inner edge of the outer seat. This ensures that the outer edge of the locking cover is completely enveloped and flush with the inner edge of the outer seat, resulting in a smooth outer surface when combined. This facilitates wiping and disinfection, reduces contaminant residue, and ensures compliance with aseptic surgical procedures.

[0011] In one embodiment, the puncture device cannula further includes a sealing assembly installed between the inner seat and the locking cap. The sealing assembly covers the edge of the inner seat and extends into the cavity of the inner seat. The sealing assembly includes a plurality of seals arranged coaxially. Thus, the sealing assembly is fixed to the inner seat by covering its edge and extending into its cavity. Utilizing its own external contour, the sealing assembly interlocks with the edge of the inner seat and the inner wall of the cavity, achieving reliable fixation without additional fixing components. This effectively simplifies the assembly structure and improves assembly efficiency.

[0012] In one embodiment, the locking cover includes a circular ring extending downward around a central hole, the circular ring restricting movement of the sealing assembly between the inner seat and the locking cover. Thus, utilizing the axial height of the downward-extending circular ring on the locking cover, when the locking cover is engaged, it directly presses against the top surface of the sealing assembly to form a fixed-stroke limit, effectively ensuring both fixation and airtightness.

[0013] In one embodiment, the locking cover further includes a plurality of reinforcing blocks disposed between the circular ring and the central hole and integrally connected to the locking cover. These reinforcing blocks also restrict the movement of the sealing assembly between the inner seat and the locking cover, and increase the strength of the locking cover. Thus, the reinforcing blocks are radially distributed between the circular ring and the central hole to form a reinforcing skeleton, which both restricts the movement of the sealing assembly between the inner seat and the locking cover and increases the structural strength of the locking cover.

[0014] Secondly, embodiments of this application provide a balloon trocar cannula, including a trocar cannula with two tubes and a balloon. A one-way valve is provided within the second fluid tube, used to inflate or aspirate fluid from the balloon. Thus, the balloon is positioned at the distal end of the cannula, its fluid path utilizing the wide annular chamber between the inner and outer tubes, and connected to an external air source via the second fluid tube on the seat. This allows the outer diameter of the entire trocar cannula to be determined solely by the wall thickness of the outer tube, compressing the radial dimension to its maximum, effectively minimizing tissue tearing and compression trauma during the puncture process, thereby reducing the risk of puncture trauma.

[0015] In one embodiment, the inner tube and the outer tube form a second height difference at the end away from the seat. The space between the inner tube and the outer tube at the location of the second height difference forms a second channel opening for the fluid channel. The balloon is positioned at the second channel opening, and both ends of the balloon fix and seal the inner tube and the outer tube located at the second channel opening. The second fluid tube communicates with the balloon through the fluid channel. Thus, a second height difference is formed at the end of the inner tube and the outer tube away from the seat, and the end of the inner tube extending beyond the outer tube naturally forms the second channel opening of the annular chamber. The balloon directly covers this second channel opening, allowing the entire fluid path from the second fluid tube of the seat, the annular chamber between the inner and outer tubes, and the inner cavity of the balloon to be connected. The inflation medium can flow into the balloon at a high speed, resulting in a faster inflation or deflation response and effectively improving the efficiency of adjusting the balloon size during surgery.

[0016] In one embodiment, the outer seat includes a valve body integrally formed from the same material as the first fluid tube, and a rotary valve is provided within the valve body. In this way, the rotary valve is integrated into the first fluid tube of the outer seat, eliminating the need for additional external components; direct connection allows for gas supply control, which helps shorten the preoperative tubing setup time, effectively reduces the potential risk of air leakage due to multiple joints, and thus ensures airtightness.

[0017] Thirdly, embodiments of this application provide a trocar cannula capable of simultaneously filling and withdrawing fluid, including the aforementioned trocar cannula with two tubes. The first fluid tube is used for filling fluid, while the second fluid tube is used for withdrawing fluid; or, the first fluid tube is used for withdrawing fluid, while the second fluid tube is used for filling fluid. Thus, utilizing the interior of the inner tube as a first channel and the annular chamber between the inner and outer tubes as a second channel, the two channels are controlled by valves on the first and second fluid tubes on the base, enabling free switching between fluid inlet and outlet channels and effectively improving usability.

[0018] Fourthly, embodiments of this application provide a trocar cannula with a balloon capable of simultaneously inflating and deflating fluid. The cannula includes the trocar cannula itself and a balloon assembly disposed outside the trocar cannula. The balloon assembly includes a balloon, a fluid conduit, and a fluid check valve communicating with the balloon via the fluid conduit. Thus, the balloon is connected to the fluid check valve via the fluid conduit to supply air to the balloon. In actual operation, the balloon, in conjunction with a retainer, secures the trocar to the wall of a body cavity, such as the abdominal cavity or thoracic cavity, thereby preventing the trocar from slipping and ensuring effective fixation.

[0019] In one embodiment, a second channel opening of the fluid channel is formed in the space between the inner tube and the outer tube at their ends away from the seat. The inner tube and the outer tube may or may not form a second height difference at their ends away from the seat. Thus, the second channel opening of the fluid channel formed in the space between the inner tube and the outer tube at their ends away from the seat has a flow area equal to the cross-section of the entire annular chamber, effectively improving gas flow efficiency.

[0020] Fifthly, embodiments of this application also provide a puncture device assembly, including a puncture core and the puncture device cannula with two tubes; or, including a puncture core and the balloon puncture device cannula; or, including a puncture core and the puncture device cannula capable of simultaneously inflating and aspirating fluid; or, including a puncture core and the puncture device cannula with a balloon capable of simultaneously inflating and aspirating fluid. Thus, regardless of the combination of the puncture core with any of the aforementioned puncture device cannulas, the puncture core only needs to be guided by the inner lumen of the inner tube, while the outer diameter of the cannula is determined solely by the single-layer wall thickness of the outer tube, maximally reducing the radial dimensions of the entire assembly and effectively minimizing puncture trauma; simultaneously, the wide fluid channel between the inner and outer tubes of the puncture device cannula helps improve gas flow efficiency.

[0021] In one embodiment, the puncture core has a plurality of downwardly extending vertical inserts, and the outer seat has a plurality of opposing vertical incisions that mate with the plurality of vertical inserts. Thus, the inserts on the puncture core and the vertical incisions on the outer seat interlock to form a circumferential limiting pair, simultaneously achieving fixation and installation with the seat body. This prevents the puncture core from freely rotating around its own axis during insertion, thereby improving the reliability of intraoperative procedures.

[0022] The beneficial effects of the dual-tube trocar cannula, balloon trocar cannula, and trocar assembly provided in this application are as follows: Compared with the prior art, the trocar cannula of this application includes a seat, an outer tube, and an inner tube. The inner tube and the outer tube are coaxially arranged, and a fluid channel with an annular chamber is formed between them at a certain distance. This allows the wall thickness of the inner and outer tubes to be designed to be thinner, thereby significantly reducing the overall radial wall thickness of the cannula. During puncture, the thinner outer diameter of the cannula means less compression and tearing of the abdominal wall tissue, which is beneficial to improving the smoothness of puncture, effectively reducing puncture trauma, and ensuring surgical results.

[0023] The fluid channel consists of an annular chamber between an inner and outer tube. The equivalent cross-sectional area of ​​this annular chamber is significantly larger than the narrow pores in a traditional tube wall, resulting in a more uniform airflow distribution. As gas flows through this fluid channel, the flow resistance is significantly reduced, enabling the establishment of a stable pneumoperitoneum with a faster flow rate and less pressure loss. This not only shortens surgical preparation time but also allows for more sensitive regulation and maintenance of intraoperative intra-abdominal pressure fluctuations, thereby improving the stability of the pneumoperitoneum and increasing gas flow efficiency. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A three-dimensional structural diagram of a trocar cannula with two tubes provided in an embodiment of this application; Figure 2 An internal schematic diagram of the exploded structure of a puncture cannula with two tubes provided in an embodiment of this application; Figure 3 This is a schematic diagram of the internal structure of the seat provided in an embodiment of this application; Figure 4 A schematic diagram of the internal structure of one end of the outer tube and inner tube provided in an embodiment of this application; Figure 5 A schematic diagram of the internal structure of the outer and inner tubes connected within the tube seat, provided in an embodiment of this application; Figure 6 A partial three-dimensional structural diagram of a trocar cannula with two tubes provided in an embodiment of this application; Figure 7 A schematic diagram of the assembly structure of the locking cover and the outer seat provided in an embodiment of this application; Figure 8 This is a three-dimensional structural diagram of the locking cover provided in an embodiment of this application; Figure 9 A schematic diagram of the internal structure of the seat of a trocar cannula with two tubes provided in an embodiment of this application; Figure 10 This is a schematic diagram of the assembly structure of the locking cover, sealing assembly, and base provided in the embodiments of this application; Figure 11 A three-dimensional structural diagram of the balloon puncture device cannula provided in the embodiments of this application; Figure 12 A schematic diagram of the balloon connection portion of the balloon puncture device cannula provided in an embodiment of this application; Figure 13 A schematic diagram of a working structure of a puncture cannula capable of simultaneously filling and extracting fluid, provided in an embodiment of this application. Figure 14 A schematic diagram of another working state structure of the puncture cannula that can simultaneously fill and extract fluid, provided in an embodiment of this application. Figure 15 A three-dimensional structural diagram of a puncture cannula with a balloon that can be simultaneously inflated and deflated for the purposes of this application embodiment. Figure 16 A three-dimensional structural schematic diagram of the puncture device assembly provided in an embodiment of this application; Figure 17 This is a three-dimensional structural diagram of the puncture core provided in an embodiment of this application; Figure 18 A three-dimensional structural view of the seat of a puncture cannula with two tubes provided in an embodiment of this application.

[0026] The following are the labeling elements in the figure: 100-Puncture Instrument Cannula; 1-Base; 11-Outer base; 111-First fluid pipe; 112-Locking port; 113-Vertical locking groove; 12-Inner seat; 121-Opening; 13-Pipe seat; 131-Second fluid pipe; 132-Two inner and outer circular steps; 133-Opening; 14-One-way valve; 15-Rotary valve; 16-Vertical cut; 2-Outer tube; 3-Inner tube; 4-Locking cover; 40-Center hole; 41-Locking body; 42-Vertical locking block; 43-Circular ring; 44-Reinforcing block; 5-Sealing assembly; 51-First seal; 511-First protrusion; 52-Second seal; 521-Groove; 522-Second protrusion; 6-Balloon; 61-Fluid conduit; 62-Fluid check valve; 7-Piercing core; 71-Vertical insert. Detailed Implementation

[0027] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0028] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0029] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0031] Traditional trocar cannulas integrate fluid channels into their walls, resulting in a narrow, elongated channel that is essentially a thin passage within the cannula's wall thickness. This traditional cannula structure, by integrating the fluid channel into the cannula wall, leads to a larger overall wall thickness, affecting puncture performance and increasing the risk of puncture trauma. Furthermore, the fluid channel, consisting only of a narrow, elongated passage on the cannula, is very constricted, resulting in low gas flow efficiency.

[0032] To address the above issues, the applicant has designed a novel double-tube trocar cannula, balloon trocar cannula, and trocar assembly. The trocar cannula has been redesigned to reduce its thickness, thereby improving puncture performance and reducing the risk of puncture trauma. Simultaneously, the fluid channel has been widened, effectively improving gas flow efficiency. This solves the problems of traditional trocar cannula structures, where integrating the fluid channel into the cannula wall leads to increased overall wall thickness, which can increase puncture trauma and reduce gas flow efficiency. Please see the following description for details.

[0033] Please refer to the following: Figure 1 and Figure 2 The puncture device cannula with two tubes includes a base 1, an outer tube 2, and an inner tube 3.

[0034] The base 1 includes an outer base 11, an inner base 12, and a tube base 13, and the outer base 11, the inner base 12, and the tube base 13 are arranged coaxially and integrally formed from the same material.

[0035] The outer seat 11 is provided with a first fluid pipe 111, which is integrally formed from the same material as the outer seat 11. The inner seat 12 is located inside the outer seat 11, and the side wall of the inner seat 12 is provided with an opening 121, which communicates with the first fluid pipe 111.

[0036] Please refer to the following: Figure 2 and Figure 3 The tube seat 13 is provided with a second fluid tube 131, which is integrally formed from the same material as the tube seat 13. The inner sidewall of the tube seat 13 has two circular steps 132, one inner and one outer. An opening 133 is provided at the connection point of the two circular steps 132, and this opening 133 communicates with the second fluid tube 131. This can be understood as the tube seat 13 having two circular steps 132 with different diameters on its inner sidewall, wherein the diameter of the inner circular step is smaller than that of the outer circular step.

[0037] It should be noted that the fluids flowing through the first fluid pipe 111 and the second fluid pipe 131 can be air, carbon dioxide, or liquids. This embodiment uses gas as an example.

[0038] Please refer to the following: Figure 2 , Figure 3 and Figure 4 The inner tube 3 and outer tube 2 can preferably be made of plastic or metal. The ends of the inner tube 3 and the outer tube 2 are fixed at different heights and sealed on the two circular steps 132. This can be understood as follows: Figure 2 As shown, the inner tube 3 is longer than the outer tube 2, so that after the inner tube 3 and the outer tube 2 are connected, the two ends of the inner tube 3 extend from the two ends of the outer tube 2, thereby forming different height differences L1 and L2 at the two ends.

[0039] Among them, such as Figure 4 As shown, a certain distance is provided between the inner tube 3 and the outer tube 2 to form a fluid channel M with an annular chamber. This fluid channel M communicates with the opening 133 at the connection point of the two circular steps 132, and further communicates with the second fluid tube 131. This means, please refer to... Figure 2 and Figure 5 As shown, the fluid channel opening corresponding to the height difference L1 between one end of the inner tube 3 and the outer tube 2 (e.g.) Figure 5 The position M1 corresponds to the connection point of the inner and outer circular steps 132, and is simultaneously connected to the second fluid pipe 131 through the opening 133.

[0040] Compared with the prior art, the trocar cannula with dual tubes provided in this application embodiment includes a base 1, an outer tube 2, and an inner tube 3. The inner tube 3 and the outer tube 2 are coaxially arranged, and a fluid channel M with an annular chamber is formed between them at a certain distance. This allows the wall thickness of the inner tube 3 and the outer tube 2 to be designed to be thinner, thereby significantly reducing the overall radial wall thickness of the cannula. During puncture, a thinner outer diameter of the cannula means less compression and tearing of the abdominal wall tissue, which helps to improve the smoothness of puncture, effectively reduce puncture trauma, and ensure surgical results.

[0041] The fluid channel M consists of an annular chamber between the inner tube 3 and the outer tube 2. The equivalent cross-sectional area of ​​this annular chamber is much larger than the narrow orifices in a traditional tube wall, and the airflow distribution is more uniform. When gas flows through the fluid channel M, the gas flow resistance is significantly reduced, enabling the establishment of a stable pneumoperitoneum with a faster flow rate and less pressure loss. This not only shortens the surgical preparation time but also allows for more sensitive regulation and maintenance of intraoperative intra-abdominal pressure fluctuations, thereby improving the stability of the pneumoperitoneum.

[0042] Furthermore, the trocar cannula provided in this application integrates the outer seat 11, inner seat 12, tube seat 13, first fluid tube 111, and second fluid tube 131 into a single piece of material, and is sealed and fixed to the inner tube 3 and outer tube 2 on two circular steps 132. This not only makes the overall structure more compact and achieves the effect of reducing wall thickness, but also fundamentally solves the problems of accumulated assembly errors and excessive sealing interfaces caused by the assembly of multiple parts, which is conducive to improving the overall reliability of the trocar cannula and thus reducing production costs.

[0043] For the structure of the inner tube 3 and the outer tube 2, please refer to one embodiment of this application. Figure 2 , Figure 4 and Figure 5 Inside the tube seat 13, the installation position of the end of the inner tube 3 is higher than the installation position of the end of the outer tube 2 to form a first height difference L1.

[0044] Correspondingly, an opening 133 is formed at the connection of the inner and outer circular steps 132 within the aforementioned tube seat 13, at the first height difference L1. The space between the inner tube 3 and the outer tube 2 at the location of the opening 133 forms the first channel port M1 of the fluid channel M, which communicates with the second fluid tube 131 within the tube seat 13.

[0045] In this way, by utilizing the axial height difference between the ends of the inner tube 3 and the outer tube 2, the shape of the inner and outer circular steps 132 inside the tube seat 13 is matched and sealed and fixed. The first channel opening M1 corresponds exactly to the connection point of the inner and outer circular steps 132, and then communicates with the second fluid tube 131 through the opening 133.

[0046] After the gas from the second fluid tube 131 enters the tube seat 13, it is evenly dispersed into the annular chamber between the inner tube 3 and the outer tube 2 through the wide first channel opening M1. On the one hand, the cross-sectional area of ​​the entire flow path is wider than that of a traditional thin channel with a thick tube wall, effectively reducing the flow resistance coefficient. This allows the gas to quickly fill and flow in the annular chamber at a high velocity and low turbulence, which is beneficial to improving gas flow efficiency. On the other hand, it allows the wall thickness of the inner tube 3 and the outer tube 2 to be as thin as possible to meet the strength requirements, making the puncture operation smoother and effectively reducing puncture trauma.

[0047] Furthermore, by setting the inner tube 3 to be installed higher than the outer tube 2, and with the opening 133 located at this height difference, the airflow entering the annular chamber is naturally blocked by the protruding part of the inner tube 3 and flows downward into the first channel opening M1, eliminating the need for additional guide ribs or deflection joints. Simultaneously, since the inner tube 3 and outer tube 2 are respectively fixed to the inner and outer circular steps 132, this height difference causes the two sealing surfaces to be axially offset, reducing interference between the sealing interfaces, making assembly simpler and more reliable, and facilitating the simplification of the structure on the base 1 and the assembly structure between components.

[0048] For the specific structure of the trocar cannula, please refer to one embodiment of this application. Figure 6 , Figure 7 and Figure 8 The puncture device cannula also includes a locking cap 4 installed on the outer seat 11. The inner wall of the outer seat 11 is provided with multiple locking holes 112 and / or several vertical locking grooves 113.

[0049] The locking cover 4 includes a locking body 41 and / or a vertical locking block 42. The locking body 41 may preferably have a hook. The locking body 41 is used to engage with the plurality of locking holes 112 to achieve installation and fixation. The vertical locking block 42 is used to engage with the plurality of vertical locking grooves 113 to serve as an installation guide.

[0050] The plurality of vertical locking slots 113 may be one or more, as in this embodiment, for example... Figure 7 As shown, the inner wall of the outer seat 11 preferably has two vertically arranged locking grooves 113; in a corresponding manner, as Figure 8 As shown, the locking cover 4 has the same number of vertical locking blocks 42 as the vertical locking grooves 113 and corresponding in position.

[0051] Thus, the locking cover 4 is quickly installed and fixed by engaging with the locking port 112 on the inner wall of the outer seat 11 through the locking body 41; at the same time, the vertical locking block 42 engages with the vertical locking groove 113, thereby limiting the circumferential rotational freedom of the locking cover 4 when it is pushed in, thus playing a guiding role in the installation. This simplifies the installation operation of the locking cover 4, shortens the assembly cycle, and improves assembly efficiency.

[0052] The locking port 112 and the vertical locking groove 113 are both located on the inner wall of the outer seat 11, forming a concealed structure. The locking body 41 and the vertical locking block 42 that cooperate with it are also located inside the locking cover 4. This built-in axial guidance and radial locking ensures that the entire connection structure does not protrude outward, making full use of the original space inside the outer seat 11. This keeps the outer contour of the seat 1 smooth, without adding any extra radial dimension structure, effectively avoiding volume redundancy caused by exposed fixing structure, and facilitating wiping and disinfection, reducing contaminant residue, and meeting the requirements of aseptic surgical operation.

[0053] Preferably, please refer to Figure 9 The top outer edge of the locking cover 4 is surrounded and flush with the top inner edge of the outer seat 11.

[0054] Thus, the outer edge of the locking cap 4 is completely enclosed and flush with the inner edge of the outer seat 11, meaning that the two together form a smooth outer surface. This structure eliminates any open gaps or outward-facing rough edges, allowing peripheral instruments or cables to slide smoothly through during surgery without getting stuck or tangled. At the same time, the smooth top surface facilitates wiping and disinfection, reducing contaminant residue and ensuring compliance with aseptic surgical procedures.

[0055] Furthermore, the edge of the locking cover 4 is surrounded by the inner edge of the outer seat 11, meaning that the outer seat 11 covers and presses against the outer periphery of the locking cover 4 in the axial direction. When intra-abdominal pressure acts on the inner tube 3 and outer tube 2 during surgery, generating a force that pushes the locking cover 4 outward, this axial force is directly transmitted to the inner wall step of the outer seat 11, rather than relying solely on the cantilever buckle of the locking cover 4 itself to bear the load. This nested, enveloping force-bearing mode makes it difficult for the locking cover 4 to move axially or dislodge even under the vibration caused by frequent insertion and removal of instruments, effectively improving connection reliability and ensuring the coaxiality of each component during operation.

[0056] For the specific structure of the base 1, please refer to one embodiment of this application. Figure 9 and Figure 10 The puncture cannula also includes a sealing assembly 5, which is installed inside the outer seat 11 and located between the inner seat 12 and the locking cap 4.

[0057] When the sealing assembly 5 is installed inside the outer seat 11, the sealing assembly 5 covers the edge of the inner seat 12 and extends into the cavity of the inner seat 12, forming an interlocking and fixing structure.

[0058] The sealing assembly 5 includes multiple sealing elements arranged coaxially. In this embodiment, as shown... Figure 10 As shown, the sealing assembly 5 includes a first sealing element 51 and a second sealing element 52 stacked on top of each other. Preferably, a first protrusion 511 is provided at the bottom of the upper first sealing element 51, and a groove 521 for the first protrusion 511 to be inserted into the lower second sealing element 52, thereby forming a bidirectional constraint in both the axial and radial directions. This interlocking fit allows the two sealing elements to distribute the force through the contact surface between the first protrusion 511 and the sidewall of the groove 521 when subjected to shear forces generated by insertion and removal, thus maintaining a coaxial stacked state without relative slippage. At the same time, this structure creates a labyrinthine sealing path between the layers, which means that if gas wants to leak outward along the outer wall of the instrument, it must bypass the tortuous contact interface between the first protrusion 511 and the groove 521, and its flow resistance is much greater than that of simple planar contact, thereby improving the sealing performance. In addition, the bottom of the second sealing element 52 is also provided with a second protrusion 522 so that it can be inserted into the cavity of the inner seat 12, so that the two sealing elements can be sealed and fixed on the inner seat 12.

[0059] In this way, the sealing component 5 is fixed to the inner seat 12 by covering the edge of the inner seat 12 and extending into the cavity of the inner seat 12. By utilizing the outer contour of the sealing component 5 itself, it forms an interlocking fit with the edge of the inner seat 12 and the inner wall of the cavity, and can be reliably fixed without additional fixing parts, effectively simplifying the assembly structure and improving assembly efficiency.

[0060] The structure of the locking cover 4 is further optimized for the installation and fixation of the sealing component 5. Please refer to one embodiment of this application as well. Figure 8 , Figure 9 and Figure 10 The locking cover 4 includes a circular ring 43 extending downward around the central hole 40, which can be used to restrict the movement of the sealing assembly 5 between the inner seat 12 and the locking cover 4.

[0061] In this embodiment, the locking cover 4 has a central hole 40 for the piercing core to pass through, and the bottom of the locking cover 4 has a circular ring 43, which is coaxially arranged with the central hole 40 and extends downward, so as to restrict the sealing assembly 5 disposed between the inner seat 12 and the locking cover 4.

[0062] In this way, by utilizing the axial height of the downward-extending circular ring 43 on the locking cover 4, when the locking cover 4 is engaged, it directly presses against the top surface of the sealing assembly 5 to form a fixed-stroke limit. Regardless of how the overall thickness of the seal fluctuates within a small range, the circular ring 43 can ensure that it obtains a stable and preset compression deformation, effectively ensuring the fixing effect and airtightness.

[0063] The circular ring 43 on the locking cover 4 is coaxially arranged around the central hole 40 of the locking cover 4. The inner or outer wall of the circular ring 43 is radially close to or adjacent to the outer edge of the sealing assembly 5, which is equivalent to setting up a fence around the sealing assembly 5. When the sealing assembly 5 is subjected to the lateral force of the puncture core, the circular ring 43 directly bears the radial component force, preventing the overall displacement of the sealing assembly 5, and effectively ensuring that the multiple seals can always remain coaxially aligned with the central hole 40.

[0064] In one embodiment of this application, please refer to the following: Figure 8 and Figure 9 The locking cover 4 also includes several reinforcing blocks 44, which are disposed between the circular ring 43 and the central hole 40 and are integrally connected to the locking cover 4. These reinforcing blocks 44 also limit the movement of the sealing assembly 5 between the inner seat 12 and the locking cover 4, and can increase the structural strength of the locking cover 4.

[0065] As can be seen, the reinforcing blocks 44 can be two or more, and the multiple reinforcing blocks 44 are radially distributed between the circular ring 43 and the central hole 40 to form a reinforcing skeleton. This helps to transform the load-bearing area at the top of the locking cover 4 from a solid surface into a lightweight frame structure, allowing the wall thickness of the central hole 40 and the circular ring 43 to be significantly reduced under the same bending strength. This not only makes the entire locking cover 4 lighter and more economical in terms of material, but also eliminates the need to add any protruding structures outward or upward, effectively reducing the volume and simplifying the structure.

[0066] The reinforcing blocks 44 on these locking covers 4 can act as radial force transmission bridges connecting the circular ring 43 and the central hole wall, dispersing the bending stress originally concentrated at the root of the circular ring 43 or the edge of the central hole 40 to these multiple reinforcing blocks 44, effectively reducing local peak stress. This allows the locking covers 4 to maintain good dimensional stability and structural integrity even under conditions such as repeated disassembly and assembly, and high-temperature and high-pressure sterilization, which helps to extend their service life.

[0067] Using the aforementioned trocar cannula as a basic component, various variations can be achieved in practical applications, including but not limited to the following forms: Example 1 Please see Figure 11In an embodiment of this application, a balloon puncture cannula is provided, including the aforementioned puncture cannula 100 and balloon 6. A one-way valve 14 is provided in the second fluid tube 131 on the seat body 1. The one-way valve 14 is used to inflate or withdraw fluid from the balloon 6.

[0068] Thus, the balloon 6 is positioned at the distal end of the cannula (a combination of the inner tube 3 and the outer tube 2), and its fluid path utilizes the wide annular chamber between the inner tube 3 and the outer tube 2, and is connected to an external air source through the second fluid tube 131 on the seat 1. This allows the outer diameter of the entire trocar cannula 100 to be determined solely by the wall thickness of the outer tube 2, compressing the radial dimension to its maximum, effectively minimizing tissue tearing and compression trauma during the puncture process, thereby reducing the risk of puncture trauma.

[0069] Furthermore, by incorporating the one-way valve 14 for inflating the balloon 6 within the second fluid tube 131 of the seat 1, the balloon 6 inflation function is fully integrated into the seat 1. The operator can independently inflate or deflate the balloon 6 simply by connecting the air supply component to the second fluid tube 131 of the seat 1. Integrating both air ports on the seat 1 (i.e., the first fluid tube 111 for the pneumoperitoneum and the second fluid tube 131 for the balloon 6) into the seat 1 effectively eliminates the risk of cross-inflation and significantly simplifies the structure into a single, integrated unit 1.

[0070] Because the inflation path of balloon 6 is an annular chamber between the inner tube 3 and the outer tube 2, its flow cross-sectional area is tens of times larger than that of a traditional elongated orifice. Combined with the one-way valve 14 within the second fluid tube 131, gas rapidly inflates balloon 6 with extremely low resistance during inflation, achieving rapid expansion and fixation. When the cannula needs to be removed at the end of the surgery, the one-way valve 14 is opened for reverse aspiration, and the efficient flow-guiding capacity of the annular chamber causes balloon 6 to collapse rapidly. This significantly shortens surgical preparation and termination time while avoiding the risk of local ischemic damage caused by prolonged tissue compression by balloon 6, effectively ensuring surgical outcomes.

[0071] In this embodiment, please refer to the following: Figure 2 , Figure 11 and Figure 12 The inner tube 3 and the outer tube 2 form a second height difference L2 at the end away from the seat 1. The space between the inner tube 3 and the outer tube 2 at the location of the second height difference L2 forms the second channel opening M2 of the fluid channel M.

[0072] The balloon 6 is positioned at the second channel opening M2, and the inner tube 3 and outer tube 2 located at the second channel opening M2 are fixed and sealed at both ends of the balloon 6. The second fluid tube 131 is in fluid communication with the balloon 6 through the fluid channel M.

[0073] like Figure 12As shown, at the end of the inner tube 3 and the outer tube 2 located away from the seat body 1, a part of the balloon 6 is sealed and fixed to the outer tube 2, and another part of the balloon 6 is sealed and fixed to the protruding part of the inner tube 3 extending from the end of the outer tube 2, so that the second channel port M2 of the fluid channel M located at this end is connected to the balloon 6.

[0074] On the one hand, the balloon 6 directly utilizes the outer wall of the outer tube 2 and the protrusion of the inner tube 3 as its mounting base, allowing the balloon 6 to be integrally connected with the inner tube 3 and the outer tube 2. At the distal end, the outer diameter of the trocar cannula 100 is determined solely by the solid wall thickness of the outer tube 2, and the balloon 6, when deflated, can fit snugly against the cannula surface without adding any additional radial dimension. This significantly reduces the stretching force on the abdominal wall muscle fibers during puncture, further minimizing puncture trauma.

[0075] On the other hand, part of the balloon 6 is sealed and fixed to the outer wall of the outer tube 2, and another part is sealed and fixed to the outer wall of the protruding part of the inner tube 3. This fixing method, while installing the balloon 6, completely seals the second channel opening M2 at the distal end of the annular gap between the inner tube 3 and the outer tube 2. The balloon wall material itself acts as a distal sealing barrier of the annular chamber, preventing the high-pressure inflation medium from leaking into the abdominal cavity, but instead ensuring that it all enters the interior of the balloon 6, effectively guaranteeing the sealing effect and improving the inflation speed of the balloon 6.

[0076] Thus, a second height difference L2 is formed at the end of the inner tube 3 and the outer tube 2 away from the seat body 1, and the end of the inner tube 3 extending out of the outer tube 2 naturally forms the second channel opening M2 of the annular chamber. The balloon 6 directly covers this second channel opening M2, making the entire fluid path from the second fluid tube 131 of the seat body 1, the annular chamber between the inner tube 3 and the outer tube 2, and the inner cavity of the balloon 6 connected. The inflation medium can rush into the balloon 6 at high speed, and the inflation or deflation response speed is faster, effectively improving the operational efficiency of adjusting the size of the balloon 6 during surgery.

[0077] In this embodiment, please refer to Figure 11 The outer seat 11 also includes a valve body integrally formed from the same material as the first fluid pipe 111, and a rotary valve 15 is provided in the valve body.

[0078] In this way, the rotary valve 15 is integrated into the first fluid pipe 111 of the outer seat 11, eliminating the need for additional external components. Direct connection can complete the gas supply control, which helps to shorten the preoperative pipeline setup time, effectively reduce the potential air leakage risk introduced by multiple joints, and thus ensure airtightness.

[0079] The valve body, the first fluid pipe 111, and the outer seat 11 are all integrally formed from the same material. This means that there are no physical seams or assembly gaps between the valve body and the seat 1. The rotary valve 15 core is directly installed in the valve cavity formed by the original material of the seat 1. The entire air passage from the air inlet to the first fluid pipe 111 is completely surrounded by a continuous solid material, which helps to eliminate external air leakage paths caused by poor assembly of external valve components and further improves the airtightness of the seat 1.

[0080] Example 2 Please refer to the following: Figure 13 and Figure 14 In the embodiments of this application, a puncture cannula 100 capable of simultaneously filling and withdrawing fluid is also provided, including the puncture cannula 100 described above, wherein the first fluid tube 111 is used for filling fluid and the second fluid tube 131 is used for withdrawing fluid; or, the first fluid tube 111 is used for withdrawing fluid and the second fluid tube 131 is used for filling fluid.

[0081] As an example, in one embodiment, such as Figure 13 As shown (the arrows in the figure indicate the direction of gas flow), the first fluid pipe 111 on the seat 1 is used to fill the seat 1 with fluid, and the fluid enters the target part along the inside of the inner pipe 3; the second fluid pipe 131 on the pipe seat 13 is used to extract the fluid, and the fluid is extracted along the fluid channel M between the inner pipe 3 and the outer pipe 2.

[0082] As an example, in another embodiment, such as Figure 14 As shown (the arrows in the figure indicate the direction of gas flow), the first fluid pipe 111 on the seat 1 is used to extract fluid, and the fluid is extracted along the inside of the inner pipe 3; the second fluid pipe 131 on the pipe seat 13 is used to fill fluid, and the fluid reaches the target part along the fluid channel M between the inner pipe 3 and the outer pipe 2.

[0083] Therefore, this solution cleverly utilizes the interior of the inner tube 3 as the first channel and the annular chamber between the inner tube 3 and the outer tube 2 as the second channel. The two channels are controlled by the valves on the first fluid pipe 111 and the second fluid pipe 131 on the seat body 1, so as to realize the free switching of fluid inlet and outlet channels and effectively improve the flexibility of use.

[0084] As an example, when needed during surgery, the first fluid tube 111 can be connected to the irrigation fluid source, and the second fluid tube 131 can be connected to negative pressure suction. The central passage of the inner tube 3 provides a low-resistance channel for the irrigation fluid to directly reach the target site, while the annular chamber provides a high-flow-rate suction path. This allows the trocar cannula 100 to switch between multiple modes such as irrigation, suction, and air injection via an external valve without being removed, which helps reduce the number of instrument exchanges during surgery, thereby reducing puncture trauma and the risk of infection, and effectively ensuring the surgical outcome.

[0085] Example 3 Please see Figure 15 In the embodiments of this application, a trocar cannula 100 with a balloon 6 that can simultaneously inflate and aspirate fluid is also provided. It includes the trocar cannula 100 of the above embodiment 2 and a balloon assembly disposed on the outside of the trocar cannula 100. The balloon assembly includes a balloon 6, a fluid conduit 61, and a fluid check valve 62 that communicates with the balloon 6 through the fluid conduit 61.

[0086] Thus, balloon 6 is connected to fluid check valve 62 via fluid conduit 61 to supply air to balloon 6. In actual operation, balloon 6 works with limiter to fix trocar to the wall of body cavity, such as abdominal cavity or thoracic cavity, thereby preventing trocar from slipping and ensuring the fixation effect of trocar.

[0087] The balloon 6 is equipped with an independent fluid conduit 61 and a fluid check valve 62, which are separate from the trocar cannula 100. The inflation, pressure holding, and deflating processes of the balloon 6 do not interfere with the air inlet and outlet channels within the trocar cannula 100, effectively eliminating risks such as cross-contamination and pressure interference, thereby improving reliability.

[0088] For the structure on the distal end of the cannula in this embodiment, please refer to [link / reference]. Figure 15 The space between the inner tube 3 and the outer tube 2 at the ends away from the seat body 1 forms the second channel port M2 of the fluid channel M. The inner tube 3 and the outer tube 2 at the ends away from the seat body 1 form a second height difference L2 or do not form a second height difference L2.

[0089] As an example, in one embodiment, such as Figure 15 As shown, the inner tube 3 and the outer tube 2 form a second height difference L2 at the ends away from the seat 1, so that the second channel port M2 can be used as a channel port for filling or extracting fluid.

[0090] In another embodiment (not shown in the figure), the inner tube 3 and the outer tube 2 do not form a second height difference L2 at the ends away from the seat 1, and the second channel port M2 can also be used as a channel port for filling or extracting fluid.

[0091] Thus, a second channel opening M2 of the fluid channel M is formed in the space between the inner tube 3 and the outer tube 2 at the ends away from the seat body 1. The second channel opening M2 is a complete annular cavity opening 121 between the outer wall of the inner tube 3 and the inner wall of the outer tube 2. Its flow area is equal to the cross-section of the entire annular cavity, so that the large cross-section advantage of the annular cavity extends from the seat body 1 all the way to the far end, realizing low resistance performance throughout the entire flow channel and effectively improving gas flow efficiency.

[0092] In another embodiment of this application, please refer to [the relevant document / reference]. Figure 16 and Figure 17This application also provides a puncture device assembly, including a puncture core 7 and the aforementioned puncture device cannula 100; or, including a puncture core 7 and the aforementioned balloon puncture device cannula 100; or, including a puncture core 7 and the aforementioned puncture device cannula 100 capable of simultaneously inflating and deflating fluid; or, including a puncture core 7 and the aforementioned puncture device cannula 100 having a balloon and capable of simultaneously inflating and deflating fluid.

[0093] Therefore, regardless of whether the puncture core 7 is combined with any of the above-mentioned puncture device cannulas 100, the puncture core 7 only needs to cooperate with the inner lumen of the inner tube 3 for guidance, and the outer diameter of the cannula is determined only by the single-layer wall thickness of the outer tube 2, which greatly reduces the radial dimension of the entire assembly, minimizes the compression and cutting damage to the tissue during the puncture process, and effectively reduces puncture trauma.

[0094] The fluid channel M in the trocar cannula 100 is formed by an annular chamber between the inner tube 3 and the outer tube 2. The equivalent flow cross-sectional area of ​​the annular chamber is much larger than that of the slender channels in traditional tube walls, and the airflow distribution is more uniform. When gas flows through this fluid channel M, the gas flow resistance is significantly reduced, which not only shortens the surgical preparation time but also allows for more sensitive regulation and maintenance of intraoperative intra-abdominal pressure fluctuations, thereby improving gas flow efficiency.

[0095] Regarding the mounting and mating structure between the puncture core 7 and the seat 1, please refer to one embodiment of this application. Figure 16 , Figure 17 and Figure 18 The piercing core 7 is provided with a plurality of downwardly extending vertical inserts 71, and the outer seat 11 is provided with a plurality of opposing vertical cuts 16 that cooperate with the plurality of vertical inserts 71.

[0096] The term "multiple vertical inserts 71" can be understood as meaning that the number of vertical inserts 71 is two, four, or so on. For example... Figure 17 As shown, in this embodiment, the puncture core 7 preferably has two symmetrically arranged vertical inserts 71; correspondingly, the number of vertical cuts 16 on the outer seat 11 matches and their positions correspond.

[0097] In this way, the insert on the puncture core 7 and the vertical incision 16 on the outer seat 11 are interlocked to form a circumferential limiting pair, and at the same time, they are fixed to the seat body 1, so that the puncture core 7 cannot rotate freely around its own axis when inserted, thereby improving the reliability of the operation during the operation.

[0098] Preferably, in this embodiment, such as Figure 17 and Figure 18As shown, the piercing core 7 is provided with a vertical insert 71, and the outer seat 11 and the outer edge of the locking cover 4 are provided with vertical cuts 16. The vertical cuts 16 on the outer seat 11 and the vertical cuts 16 on the locking cover 4 are combined to form a slot for the vertical insert 71 on the piercing core 7 to be inserted.

[0099] As can be seen, this embodiment cleverly utilizes the original solid wall thickness of the outer seat 11 and the original outer edge thickness of the locking cover 4, each taking half of the cut. When the locking cover 4 is assembled in place, the cuts of the two seamlessly join together in space to form a complete slot. This means that the radial depth of the slot is entirely accommodated by the wall thickness of the existing parts, without adding any protrusions or extra material thickness to the outside of the outer seat 11 or the locking cover 4. The entire guide structure is integrated within the internal contour of the assembly formed by the locking cover 4 and the outer seat 11. In this way, while realizing the insertion function, the overall structure is simplified, effectively reducing production costs.

[0100] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A trocar cannula with two tubes, characterized in that, include: The base includes an outer base, an inner base, and a tube base, which are coaxially arranged and integrally formed from the same material. The outer base is provided with a first fluid tube integrally formed from the same material as the outer base. The inner base has an opening on its side wall, and the opening communicates with the first fluid tube. The tube base is provided with a second fluid tube integrally formed from the same material as the tube base. The inner side wall of the tube base has two circular steps, one inner and one outer. An opening is provided at the connection of the two circular steps, and the opening communicates with the second fluid tube. The inner tube and the outer tube are fixed and sealed at different heights on the two circular steps. A certain distance is provided between the inner tube and the outer tube to form a fluid channel with an annular chamber. The fluid channel is connected to the opening and then to the second fluid tube.

2. The trocar cannula with two tubes according to claim 1, characterized in that, Inside the tube seat, the installation position of the end of the inner tube is higher than the installation position of the end of the outer tube to form a first height difference. The opening is formed at the first height difference, and the space between the inner tube and the outer tube at the location of the opening forms the first channel opening of the fluid channel.

3. The trocar cannula with two tubes according to claim 1 or 2, characterized in that, The puncture device cannula also includes a locking cover installed on the outer seat. The inner wall of the outer seat is provided with multiple locking ports and / or several vertical locking grooves. The locking cover includes a locking body that cooperates with the multiple locking ports and / or a vertical locking block that cooperates with the several vertical locking grooves.

4. The trocar cannula with two tubes according to claim 3, characterized in that, The top outer edge of the locking cover is surrounded and flush with the top inner edge of the outer seat.

5. The trocar cannula with two tubes according to claim 3, characterized in that, The puncture device cannula also includes a sealing assembly installed between the inner seat and the locking cap. The sealing assembly covers the edge of the inner seat and extends into the cavity of the inner seat. The sealing assembly includes a plurality of seals arranged coaxially.

6. The trocar cannula with two tubes according to claim 5, characterized in that, The locking cover includes a circular ring extending downward around a central hole, the circular ring being capable of restricting the movement of the sealing assembly between the inner seat and the locking cover.

7. The trocar cannula with two tubes according to claim 6, characterized in that, The locking cover also includes a plurality of reinforcing blocks disposed between the circular ring and the central hole and integrally connected with the locking cover. The plurality of reinforcing blocks are also used to restrict the movement of the sealing assembly between the inner seat and the locking cover and to increase the strength of the locking cover.

8. A balloon puncture device cannula, characterized in that, Includes a trocar cannula and balloon with two tubes as described in any one of claims 1-7, wherein the second fluid tube is provided with a one-way valve for inflating or deflating the balloon.

9. The balloon puncture device cannula according to claim 8, characterized in that, The inner tube and the outer tube form a second height difference at the end away from the seat body. The space between the inner tube and the outer tube at the location of the second height difference forms the second channel opening of the fluid channel. The balloon is disposed at the second channel opening, and the two ends of the balloon fix and seal the inner tube and the outer tube located at the second channel opening. The second fluid tube is in fluid communication with the balloon through the fluid channel.

10. The balloon puncture device cannula according to claim 8, characterized in that, The outer seat includes a valve body integrally formed from the same material as the first fluid pipe, and a rotary valve is provided inside the valve body.

11. A puncture cannula capable of simultaneously filling and withdrawing fluid, characterized in that, Includes a trocar cannula with two tubes as described in any one of claims 1-7, wherein the first fluid tube is used for filling fluid and the second fluid tube is used for withdrawing fluid; or, the first fluid tube is used for withdrawing fluid and the second fluid tube is used for filling fluid.

12. A trocar cannula having a balloon and capable of simultaneously inflating and aspirating fluid, characterized in that, Includes the trocar cannula as described in claim 11 and a balloon assembly disposed outside the trocar cannula, the balloon assembly including a balloon, a fluid conduit, and a fluid check valve communicating with the balloon through the fluid conduit.

13. The trocar cannula with a balloon and capable of simultaneously inflating and aspirating fluid according to claim 12, characterized in that, The inner tube and the outer tube form a second channel opening of the fluid channel in the space between their ends away from the seat body, and the inner tube and the outer tube form a second height difference or do not form a second height difference at their ends away from the seat body.

14. A puncture device assembly, characterized in that, Includes a puncture core and a puncture cannula with two tubes as described in any one of claims 1-7; Alternatively, it may include a puncture core and a balloon puncture cannula as described in any one of claims 8-10; Alternatively, it may include a puncture core and a puncture cannula as described in claim 11, capable of simultaneously filling and withdrawing fluid. Alternatively, it may include a puncture core and a puncture cannula with a balloon as described in claim 12 or 13, capable of simultaneously inflating and deflating fluid.

15. The puncture device assembly according to claim 14, characterized in that, The puncture core is provided with a plurality of downwardly extending vertical inserts, and the outer seat is provided with a plurality of opposing vertical incisions that cooperate with the plurality of vertical inserts.

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