Piercer assembly, piercer sleeve with three tubes, balloon piercer sleeve

Abstract

The application belongs to the technical field of medical instrument equipment, and provides a puncture device sleeve with three tubes, which comprises a seat body, an outer tube, a middle tube, an inner tube and a sleeve, the seat body comprises an outer seat, an inner seat and a tube seat, the outer seat is provided with a first fluid tube and a second fluid tube, the inner seat is provided with a first opening communicated with the first fluid tube and a second opening communicated with the second fluid tube, the tube seat is provided with a third fluid tube, the tube seat is provided with two circular steps inside and outside, and the connecting part of the two circular steps is provided with an opening communicated with the third fluid tube, the end of the middle tube and the end of the outer tube are fixed on the two circular steps inside and outside, the inner tube is fixed in the inner seat through the sleeve, and three fluid channels separated from each other are formed between the seat body and each tube. The application also provides a balloon puncture device sleeve and a puncture device assembly with the puncture device sleeve. The application solves the problems that the balloon inflation structure and the air inlet structure on the existing puncture device sleeve are independent of each other, the number of parts is large, and the assembly is complex.

Description

Technical Field

[0001] This application belongs to the field of medical device technology, and particularly relates to a puncture cannula with three 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, and to inflate the abdominal cavity with gas to maintain the operating space required for surgery (i.e., pneumoperitoneum).

[0003] Existing trocars include a balloon assembly mounted on the cannula. The balloon assembly comprises a balloon, a tubing connected to the balloon, and an inflation device, allowing the balloon to be positioned on the cannula and inflated / deflated to control its size. However, the air inlet on the cannula and the inflation port of the balloon assembly are two separate functional components, requiring additional integration of an inflation connector (for connecting the inflation device), sealing components, and internal connecting tubing. This significantly increases the number of parts, and most of these components require independent molds, resulting in substantial mold investment and high manufacturing costs. Furthermore, the assembly of multiple components involves numerous connection steps, leading to a complex assembly process and impacting production efficiency.

[0004] Therefore, how to achieve a reasonable integration of the balloon inflation function and the pneumoperitoneum insufflation function of the cannula, while ensuring gas flow efficiency, without increasing the cannula wall thickness, sacrificing puncture performance, or significantly increasing the number of parts and assembly complexity, is a technical problem that medical device manufacturers urgently need to solve. Summary of the Invention

[0005] The purpose of this application is to provide a puncture cannula with three tubes, a balloon puncture cannula, and a puncture assembly, so as to solve the technical problems of the independent balloon inflation structure and air intake structure on the existing puncture cannula, resulting in a large number of parts, high manufacturing cost, and complex assembly.

[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: A base body includes an outer base, an inner base, and a tube base, all coaxially arranged and integrally formed from the same material. The outer base has a first fluid tube and a second fluid tube integrally formed from the same material. The inner base has a first opening and a second opening on its sidewall, wherein the first opening communicates with the first fluid tube, and the second opening communicates with the second fluid tube. The tube base has a third fluid tube integrally formed from the same material. The inner sidewall of the tube base has two circular steps, one inner and one outer, and an opening is provided at the connection of the two circular steps, which communicates with the third fluid tube. The system comprises an outer tube, a middle tube, an inner tube, and a sleeve. The ends of the middle tube and the outer tube are fixed and sealed at different heights on two circular steps. A certain distance is provided between the middle tube and the outer tube to form a fluid channel, which communicates with the opening and then with the third fluid tube. The inner tube is fixed and sealed in the inner seat by the sleeve at a height higher than that of the middle tube. A certain distance is also provided between the inner tube and the middle tube. The first fluid pipe and the cavity of the inner pipe are connected to form a first fluid channel; the second fluid pipe and the annular cavity between the middle pipe and the inner pipe are connected to form a second fluid channel; the third fluid pipe and the annular cavity between the middle pipe and the outer pipe are connected to form a third fluid channel; and these three fluid channels are separated from each other.

[0007] Therefore, the first, second, and third fluid tubes are integrally molded from the same material onto the base, and the tube assembly formed by the outer, middle, and inner tubes, together with the three corresponding fluid tubes, constitutes three mutually isolated fluid channels. The first and second fluid channels can serve as bidirectional inlet and outlet channels for the target area, while the third fluid channel can serve as an independent dedicated airway for the balloon. These three fluid channels are structurally completely isolated, effectively preventing airway cross-contamination or pressure fluctuations. Simultaneously, this improves the flexibility and safety of intraoperative procedures, and the highly integrated component design solves the problems of high manufacturing costs and complex assembly inherent in traditional solutions.

[0008] The sleeve structure is improved by including a flange that is sealed to the inner seat. The inner seat has multiple support arms on its wall to support the flange. The lower part of the sleeve is sealed to the inner tube. The space between the lower part of the sleeve's flange and the outer wall of the sleeve, the outer wall of the inner tube, and the outer wall of the middle tube forms a second fluid channel. Thus, when the sleeve is installed in the inner seat of the base, sealing, support, and fluid channel definition can be completed simultaneously, effectively reducing the types of parts and assembly time, thereby lowering manufacturing costs and improving assembly efficiency.

[0009] The structure of the second fluid tube is improved. The second fluid tube is located outside the first fluid tube, inside the first fluid tube, or intersecting with the first fluid tube. All of these can ensure that the two channels for fluid inlet and outlet are separated from the independent airway of the balloon, effectively preventing airway cross-contamination or pressure fluctuation, thereby ensuring the independent operation reliability of each fluid channel.

[0010] In one embodiment, when the second fluid tube is disposed outside the first fluid tube, the second fluid tube is disposed on the outer seat, bypassing the first fluid tube, and the second fluid tube passes through the outer seat and the inner seat and communicates with the second fluid channel. When the second fluid tube is disposed inside the first fluid tube, a separator is provided in the first fluid tube so that the second fluid tube can communicate with the lower part of the flange of the sleeve, and thus communicate with the second fluid channel; When the second fluid pipe is arranged to cross the first fluid pipe, a separate passage is separated from the inside of the first fluid pipe to the second fluid pipe by setting an isolation member at the intersection. The passage communicates with the protruding chamber formed on the flange of the sleeve, and the protruding chamber communicates with the second fluid channel below the flange.

[0011] Thus, all three configurations mentioned above achieve a high degree of integration and physical isolation of multi-fluid channels on the housing by using different interface layouts, without increasing the thickness of the sleeve wall. This effectively eliminates the flow resistance and puncture risk caused by traditional slender channels inside the wall, and significantly reduces the number of parts, mold costs, and assembly processes, thereby achieving a comprehensive optimization of manufacturing costs, assembly efficiency, and intraoperative operational flexibility.

[0012] The internal structure of the tube seat is improved. Inside the tube seat, the installation position of the end of the middle 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 middle tube and the outer tube at the location of the opening form the first channel opening of the third fluid channel. Thus, the axial height difference between the ends of the middle tube and the outer tube fits and seals with 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 third fluid tube through the opening.

[0013] The structure of the base is improved. The trocar cannula also includes a locking cap installed on the outer base. The inner wall of the outer base has multiple locking ports and / or several vertical locking grooves. 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 grooves. The outer edge of the top of the locking cap is surrounded and flush with the inner edge of the top of the outer base. Thus, the locking cap engages with the locking ports on the inner wall of the outer base via the locking body, achieving quick installation and fixation. Simultaneously, the engagement of the vertical locking block with the vertical locking grooves restricts the circumferential rotational freedom of the locking cap when it is pushed in, thereby providing a guiding function and improving assembly efficiency. Furthermore, the outer edge of the top of the locking cap is completely wrapped and flush with the inner edge of the top of the outer base, forming a smooth outer surface after combination. This facilitates wiping and disinfection, reduces contaminant residue, and ensures compliance with surgical aseptic operation requirements.

[0014] 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.

[0015] In one embodiment, the locking cover includes a circular ring extending downward around a central hole, which restricts the movement of the sealing assembly between the inner seat and the locking cover. The locking cover also 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 restrict the movement of the sealing assembly between the inner seat and the locking cover, and increase the strength of 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 the fixing effect and airtightness. Furthermore, the radial distribution of multiple reinforcing blocks between the circular ring and the central hole forms a reinforcing skeleton, which not only restricts the movement of the sealing assembly between the inner seat and the locking cover, but also increases the structural strength of the locking cover.

[0016] Secondly, this application also provides a balloon puncture cannula capable of simultaneously inflating and deflating fluid, comprising a balloon and the puncture cannula having three tubes. A one-way valve is provided within the third fluid tube for inflating or deflating the balloon. The middle tube and the outer tube form a second height difference at the end furthest from the base, and the middle tube and the outer tube at the location of the second height difference form a second channel opening of the third fluid channel. The balloon is positioned at the second channel opening, and both ends of the balloon fix and seal the middle tube and the outer tube located at the second channel opening. The third fluid tube communicates with the balloon fluidly through the third fluid channel. Thus, the one-way valve for balloon inflation is located within the third fluid tube of the base, and the balloon inflation function is fully integrated into the base. The operator only needs to connect the air supply component to the third fluid tube of the base to independently inflate or deflate the balloon. The three air ports on the seat (i.e., the first and second fluid tubes for pneumoperitoneum and the third fluid tube for balloon) are all integrated into the seat, effectively eliminating the risk of air leakage, while greatly simplifying it into a single-unit assembly structure.

[0017] In one embodiment, the outer seat includes a valve body integrally formed from the same material as the first fluid pipe or the second fluid pipe, and a rotary valve is provided within the valve body. In this way, the rotary valve is integrated onto the first fluid pipe 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.

[0018] In one embodiment, the first fluid tube is used to fill with fluid while the second fluid tube is used to extract fluid; or, the first fluid tube is used to extract fluid while the second fluid tube is used to fill with fluid. Thus, by utilizing the first fluid channel inside the inner tube and the second fluid channel in the annular chamber between the inner and middle tubes, and with the valves on the first and second fluid tubes on the seat controlling these two channels, free switching between fluid inlet and outlet channels can be achieved. Furthermore, these two channels are independently configured from the third fluid channel used to house the guiding balloon, operating independently without interference, effectively improving usability.

[0019] Thirdly, embodiments of this application also provide a puncture device assembly, including a puncture core and the puncture device cannula with three tubes; or, including a puncture core and the balloon puncture device cannula capable of simultaneously inflating and deflating 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. This minimizes the compression and cutting damage to tissues during the puncture process, effectively reducing puncture trauma. Simultaneously, the wide fluid channels between the inner and middle tubes, and between the middle and outer tubes of the puncture device cannula, respectively, help improve gas flow efficiency.

[0020] The beneficial effects of the three-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 integrates a first fluid tube, a second fluid tube, and a third fluid tube integrally formed from the same material on the seat body, and the tube assembly formed by the outer tube, middle tube, and inner tube sleeved together, together with the aforementioned three fluid tubes, constitutes three mutually separated fluid channels. Among them, the first fluid channel and the second fluid channel can serve as bidirectional inlet and outlet channels for the target site, while the third fluid channel can serve as an independent dedicated airway for the balloon.

[0021] The three fluid channels described above are structurally completely isolated, effectively preventing cross-contamination of airways or pressure fluctuations. During surgery, the operator can independently maintain a constant balloon pressure via the third fluid channel to secure the cannula, while simultaneously using the first and second fluid channels for dynamic control of intra-abdominal gas, or to achieve one-in-one-out cyclic gas exchange. This structure improves the flexibility and safety of intraoperative procedures and solves the problems of high manufacturing costs and complex assembly associated with traditional solutions through highly integrated component design. Attached Figure Description

[0022] 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.

[0023] Figure 1 A three-dimensional structural schematic diagram of a trocar cannula with three tubes is provided for embodiments of this application; Figure 2 An exploded structural diagram of a puncture cannula with three tubes is provided for the embodiments of this application; Figure 3 A schematic diagram of the internal structure of the seat of a trocar cannula with three tubes is provided for embodiments of this application. Figure 1 ; Figure 4 This is an enlarged schematic diagram of the end structure of the tube assembly of the puncture device cannula provided in the embodiments of this application; Figure 5 A schematic diagram of the internal structure of the seat of a trocar cannula with three tubes is provided for embodiments of this application. Figure 2 ; Figure 6 A three-dimensional structural schematic diagram of the first type of puncture device cannula provided in the embodiments of this application; Figure 7 This is a schematic diagram of the internal structure of the second type of puncture device cannula provided in the embodiments of this application; Figure 8 A three-dimensional structural schematic diagram of the third type of puncture device cannula provided in the embodiments of this application; Figure 9 This is a schematic diagram of the internal structure of the third type of puncture device cannula provided in the embodiments of this application; Figure 10 A schematic diagram of the assembly structure of the base and locking cover provided in an embodiment of this application; Figure 11 This is a three-dimensional structural diagram of the locking cover provided in an embodiment of this application; Figure 12 A schematic diagram of the internal structure of a trocar cannula seat with a locking cap provided in an embodiment of this application; Figure 13 A schematic diagram of the assembly structure of the base, sealing assembly and locking cover provided in the embodiments of this application; Figure 14 This is a schematic diagram of the structure of the balloon puncture device cannula provided in the embodiments of this application; Figure 15 A schematic diagram of the distal end of the balloon puncture device cannula provided in an embodiment of this application; Figure 16 for Figure 14 A magnified structural diagram of part A in the diagram; Figure 17 This is a schematic diagram of the working state structure of the puncture cannula provided in an embodiment of this application; Figure 18 A schematic diagram of another working state structure of the puncture cannula provided in the embodiments of this application; Figure 19 A three-dimensional structural schematic diagram of the puncture device assembly provided in an embodiment of this application; Figure 20 A three-dimensional structural schematic diagram of a puncture device assembly with a balloon provided for an embodiment of this application; Figure 21 A three-dimensional structural schematic diagram of another puncture cannula provided in an embodiment of this application; Figure 22An internal diagram of the exploded structure of another puncture device cannula provided in this application embodiment; Figure 23 This is a schematic diagram of the internal structure of another type of seat provided in an embodiment of this application; Figure 24 This is a schematic diagram of the internal structure of one end of another outer tube and inner tube provided in an embodiment of this application; Figure 25 An internal structural view of an outer and inner tube connected within a tube seat, provided in an embodiment of this application; Figure 26 A three-dimensional structural diagram of the balloon puncture device cannula provided in the embodiments of this application; Figure 27 A schematic diagram of the balloon connection portion of the balloon puncture device cannula provided in an embodiment of this application; Figure 28 A schematic diagram of the working state structure of a puncture cannula capable of simultaneously filling and extracting fluid, provided in an embodiment of this application. Figure 29 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 30 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 31 A three-dimensional structural schematic diagram of another puncture device assembly provided in an embodiment of this application; Figure 32 A three-dimensional structural schematic diagram of another puncture core provided in an embodiment of this application; Figure 33 A three-dimensional structural view of the seat portion of another puncture device cannula provided in an embodiment of this application.

[0024] The following are the labeling elements in the figure: 100 - Puncture tool cannula; 200 - Puncture core; 201 - Vertical insertion strip; 1-Seat body; 11-Outer seat; 111-First fluid pipe; 112-Second fluid pipe; 113-Separator; 114-Isolation component; 115-Locking port; 116-Vertical locking groove; 117-Valve body; 118-Rotary valve; 119-Vertical cut; 12-Inner seat; 121-First opening; 122-Second opening; 123-Support arm; 13-Pipe seat; 131-Third fluid pipe; 132-Two circular steps, inner and outer; 133-Opening; 134-One-way valve; 2-Outer tube; 3-Middle tube; 4-Inner tube; 5-Sleeve; 51-Flange; 52-Protruding chamber; 6-Locking cover; 60-Center hole; 61-Locking body; 62-Vertical locking block; 63-Circular ring; 64-Reinforcing block; 7-Sealing assembly; 71-First seal; 711-First protrusion; 72-Second seal; 721-Groove; 722-Second protrusion; 8-Balloon; 81-Fluid conduit; 82-Fluid check valve. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] In related technologies, the balloon function is directly integrated into the cannula wall, i.e., a thin, elongated inflation channel is created within the cannula wall, with one end connecting to the balloon lumen and the other end leading to the outside for communication with the inflation device. However, this results in an increase in the overall wall thickness of the cannula, affecting puncture performance and increasing the risk of puncture trauma. Furthermore, the fluid channel is merely a thin, elongated channel within the cannula wall, leading to a very narrow fluid passage and low gas flow efficiency.

[0030] Therefore, this application provides a novel trocar cannula with three tubes, a balloon trocar cannula, and a trocar assembly. On one hand, the base of the trocar cannula is redesigned to integrate inlet and outlet fluid channels and an independent airway for the balloon. On the other hand, based on the structure of the base, a multi-layered tube assembly is designed, with each layer of tubes spaced apart to form an annular cavity, constituting multiple fluid channels interconnected on the tube assembly and the base. This separates the inlet and outlet fluid channels integrated on the trocar cannula from the balloon airway. Thus, without increasing the overall volume, the performance of the trocar cannula is effectively improved, thereby solving the problems of traditional trocar cannulas where the balloon inflation and inlet structures are independent, resulting in a large number of parts, high manufacturing costs, and complex assembly. A detailed description follows.

[0031] Please refer to the following: Figure 1 , Figure 2 and Figure 3 The puncture device cannula with three tubes includes a base 1, an outer tube 2, a middle tube 3, an inner tube 4, and a sleeve 5.

[0032] The base 1 includes an outer base 11, an inner base 12, and a tube base 13. The outer base 11, the inner base 12, and the tube base 13 are arranged coaxially and integrally formed from the same material.

[0033] The outer seat 11 is provided with a first fluid pipe 111 and a second fluid pipe 112, and the first fluid pipe 111 and the second fluid pipe 112 are integrally formed from the same material together with the outer seat 11.

[0034] like Figure 3 As shown, the inner seat 12 is located inside the outer seat 11. The side wall of the inner seat 12 is provided with a first opening 121 and a second opening 122, wherein the first opening 121 is connected to the first fluid pipe 111 and the second opening 122 is connected to the second fluid pipe 112.

[0035] The tube seat 13 is provided with a third fluid tube 131, which is integrally formed from the same material as the tube seat 13. The inner side wall of the tube seat 13 is provided with two circular steps 132, and an opening 133 is provided at the connection of the two circular steps 132, which communicates with the third fluid tube 131.

[0036] It should be noted that the fluids flowing through the first fluid pipe 111, the second fluid pipe 112, and the third fluid pipe 131 can be air, carbon dioxide, or liquids. This embodiment uses gas as an example.

[0037] Please refer to the following: Figure 2 , Figure 3 and Figure 4The outer tube 2, middle tube 3, and inner tube 4 can preferably be made of plastic or metal. The ends of the middle tube 3 and the outer tube 2 are fixed and sealed at different heights on the inner and outer circular steps 132. A certain distance is provided between the middle tube 3 and the outer tube 2 to form a fluid channel, and the fluid channel communicates with the opening 133 at the connection of the inner and outer circular steps 132, and then communicates with the third fluid tube 131.

[0038] In addition, the inner tube 4 is fixed and sealed in the inner seat 12 by the sleeve 5 at a height higher than that of the middle tube 3, and a certain distance is also provided between the inner tube 4 and the middle tube 3 to form another fluid channel.

[0039] This can be understood as, for example Figure 2 As shown, the inner tube 4 is longer than the middle tube 3, and the middle tube 3 is longer than the outer tube 2, so that after the inner tube 4, the middle tube 3 and the outer tube 2 are connected, the two ends of the inner tube 4 and the middle tube 3 extend out from the two ends of the outer tube 2 in sequence, thereby forming multiple layers of different height differences L1 and L2 at the two ends.

[0040] like Figure 5 As shown, the cavity between the first fluid pipe 111 and the inner pipe 4 is connected to form the first fluid channel M1; the annular cavity between the second fluid pipe 112 and the middle pipe 3 and the inner pipe 4 is connected to form the second fluid channel M2; the annular cavity between the third fluid pipe 131 and the middle pipe 3 and the outer pipe 2 is connected to form the third fluid channel M3; and these three fluid channels are separated from each other.

[0041] This means, please combine Figure 3 and Figure 5 As shown, the inner cavity of the inner tube 4 is the first fluid channel M1. The annular cavity between the inner tube 4 and the middle tube 3 forms the second fluid channel M2. The annular cavity between the middle tube 3 and the outer tube 2 forms the third fluid channel M3, and the position of the channel opening M31 of the third fluid channel M3, which is the height difference L1 between one end of the middle tube 3 and the outer tube 2, corresponds to the connection point of the inner and outer circular steps 132, and is simultaneously connected to the third fluid tube 131 through the opening 133.

[0042] This design allows the balloon on the trocar cannula to have an independent inflation channel, and the seat 1 also has two fluid inlet and outlet channels. These channels are integrated onto a single trocar cannula but are separately configured to avoid interference. This means that in actual operation, the balloon can be inflated independently through the third fluid channel M3, while the first fluid channel M1 and the second fluid channel M2 on the seat 1 can be used simultaneously to inflate or aspirate the target site, thus improving the flexibility of intraoperative procedures.

[0043] Compared with the prior art, the trocar cannula with three tubes provided in this application embodiment integrates a first fluid tube 111, a second fluid tube 112, and a third fluid tube 131 integrally formed from the same material on the base 1. The tube assembly formed by the outer tube 2, middle tube 3, and inner tube 4, together with the aforementioned three fluid tubes, constitutes three mutually separated fluid channels. The first fluid channel M1 and the second fluid channel M2 can serve as bidirectional inlet and outlet channels for the target site, while the third fluid channel M3 can serve as an independent dedicated airway for the balloon.

[0044] The three fluid channels described above are structurally completely isolated, effectively preventing cross-contamination of airways or pressure fluctuations. During surgery, the operator can independently maintain a constant balloon pressure via the third fluid channel M3 to secure the cannula, while simultaneously using the first fluid channel M1 and the second fluid channel M2 to dynamically regulate intra-abdominal gas, or to achieve one-way inflow and outflow cyclic gas exchange. This structure improves the flexibility and safety of intraoperative procedures and solves the problems of high manufacturing costs and complex assembly associated with traditional solutions through a highly integrated component design.

[0045] Compared with the aforementioned related technologies, the trocar cannula of this application replaces the elongated channel in the solid wall with an annular cavity formed by the multi-layered interlocking of the outer tube 2, middle tube 3, and inner tube 4. This innovative structure completely separates the fluid channel from the solid wall of the cannula, so that the outer diameter of the cannula does not need to be increased to accommodate the airway. This allows for a smaller and thinner tube diameter, effectively avoiding excessive tissue tearing or compression injury caused by increased wall thickness, thereby reducing the risk of puncture trauma and ensuring the safety of the procedure.

[0046] Furthermore, the annular gaps between the outer tube 2 and the middle tube 3, and between the middle tube 3 and the inner tube 4, are used as fluid channels. The flow cross-sectional area of ​​this annular cavity is much larger than that of the slender channels on the traditional tube wall, which helps to reduce gas resistance along the flow path. This means that whether it is for rapid inflation and deflation of the balloon or for establishing and maintaining pneumoperitoneum pressure, the fluid response speed and flow rate are significantly improved, effectively solving the hysteresis effect caused by the slender channels on the traditional tube wall, thereby ensuring the immediacy and stability of intraoperative pneumatic operations.

[0047] For the specific structure of sleeve 5, please refer to one embodiment of this application. Figure 3 and Figure 5 The sleeve 5 includes an outwardly extending flange 51, which is sealed to the inner seat 12. The inner seat 12 is also provided with multiple support arms 123 on its tube wall to support the flange 51.

[0048] like Figure 5As shown, the lower part of the sleeve 5 is sealed to the inner tube 4, and the space between the lower part of the flange 51 of the sleeve 5 and the outer wall of the sleeve 5, the outer wall of the inner tube 4 and the outer wall of the middle tube 3 constitutes the second fluid channel M2.

[0049] Thus, the outwardly extending flange 51, integrally formed with the sleeve 5, directly seals against the inner seat 12, and this flange 51 also acts as a separator. This effectively separates the internal space of the seat 1 from the fluid passage in the pipe assembly, replacing traditionally separate sealing components. Combined with the support arm 123 integrally formed on the inner seat 12's pipe wall, it eliminates the need for additional fixing components such as snap rings or locking rings to secure the flange 51. This allows for simultaneous sealing, support, and fluid passage limitation once the sleeve 5 is installed in the inner seat 12 of the seat 1, effectively reducing the number of parts and assembly time, thereby lowering manufacturing costs and improving assembly efficiency.

[0050] In this structure, the space between the lower part of the flange 51 of the sleeve 5 and the outer wall of the sleeve 5, the outer wall of the inner tube 4 and the inner wall of the middle tube 3 defines the second fluid channel M2, and the sealing connection between the flange 51 and the inner seat 12 isolates the second fluid channel M2 from the inner cavity of the inner seat 12 from the top. This space limitation ensures that the first fluid channel M1 and the second fluid channel M2 are clearly separated when they converge into the seat body 1, effectively preventing airway crosstalk, and ensuring the normal operation of the independent airway of the balloon (i.e., the third fluid channel M3) and the inlet and outlet airways of the target part (i.e., the first fluid channel M1 and the second fluid channel M2), thereby improving the reliability of use.

[0051] The second fluid tube 112 can be located outside the first fluid tube 111, inside the first fluid tube 111, or intersecting with the first fluid tube 111. These configurations ensure that the two channels for fluid inlet and outlet are separated from the independent air passages of the balloon, effectively preventing cross-contamination of air passages or pressure fluctuations, thereby ensuring the independent and reliable operation of each fluid channel.

[0052] Specifically, the arrangement of the first fluid pipe 111 and the second fluid pipe 112 on the base 1 includes, but is not limited to, the following arrangements: Example 1 In this embodiment, please refer to the following: Figure 5 and Figure 6 When the second fluid pipe 112 is located outside the first fluid pipe 111, the second fluid pipe 112 is located on the outer seat 11, bypassing the first fluid pipe 111, and the second fluid pipe 112 passes through the outer seat 11 and the inner seat 12 to communicate with the second fluid channel M2.

[0053] As an example, such as Figure 6As shown, the first fluid pipe 111 and the second fluid pipe 112 are respectively connected to opposite sides of the base 1. The first fluid pipe 111 directly passes through the outer seat 11 and the inner seat 12 on one side of the base 1 and communicates with the inner cavity of the inner pipe 4. The second fluid pipe 112 passes through the outer seat 11 and the inner seat 12 on the other side of the base 1 and communicates with the aforementioned second fluid channel M2. It can be seen that by setting the first fluid pipe 111 and the second fluid pipe 112 on opposite sides of the base 1 and avoiding each other in space, both interfaces can achieve non-interference axial or lateral straight demolding in the mold opening and closing direction. At the same time, the outer seat 11, the inner seat 12 and the two fluid pipes are integrally molded from the same material. This straight path with independent passage on both sides makes the injection flow channel short and direct, with better filling uniformity, effectively reducing mold cost and injection molding difficulty, and thus reducing the cost of independent mold opening.

[0054] Thus, the first fluid tube 111 directly connects the outer seat 11 and the inner seat 12 on one side of the seat body 1, and is directly connected to the first fluid channel M1 in the cavity of the inner tube 4, without any bends or necking transition sections. The second fluid tube 112 independently connects the outer seat 11 and the inner seat 12 on the other side of the seat body 1, and is directly connected to the second fluid channel M2 formed by the annular cavity between the inner tube 4 and the middle tube 3, also following the shortest radial path. This structure allows the fluid to enter and exit the target area without passing through additional internal connecting hoses or detour chambers, with the shortest path and no abrupt changes or local narrowing of the flow channel cross-sectional area. Compared to the tiny, slender channels on the tube walls of traditional structures, this structure significantly reduces fluid resistance along the flow path and local resistance loss, thereby ensuring surgical effectiveness and safety.

[0055] Example 2 In this embodiment, please refer to Figure 7 When the second fluid pipe 112 is located inside the first fluid pipe 111, the second fluid pipe 112 can communicate with the lower part of the flange 51 of the sleeve 5 by providing a separator 113 in the first fluid pipe 111, and thus communicate with the second fluid channel M2.

[0056] As an example, such as Figure 7 As shown, a partition 113 extending along the length direction is provided inside the first fluid pipe 111, so that the first fluid pipe 111 and the second fluid pipe 112 are integrated on an outwardly extending pipe on the side of a seat body 1. The first fluid pipe 111 penetrates into the inner cavity of the inner seat 12, passes above the flange 51 of the sleeve 5, and then sequentially communicates with the inner cavity of the sleeve 5 and the inner cavity of the inner pipe 4, thereby forming the first fluid channel M1. The second fluid pipe 112 penetrates into the inner cavity of the inner seat 12 and communicates with the aforementioned second fluid channel M2.

[0057] In this way, the second fluid pipe 112 is coaxially sleeved inside the first fluid pipe 111, and the two are integrated into an outwardly extending integrated pipe by means of the separator 113, so that the base body 1 only needs to be provided with an external extension port on one side. This dual-channel integrated pipe design helps to simplify the mold structure of the base body 1, and only requires core pulling in one direction during manufacturing, effectively reducing the difficulty of mold processing and manufacturing costs. At the same time, it reduces the amount of material used in a single injection of the base body 1, further reducing the material cost of parts and the cost of mold opening.

[0058] For the preoperative tubing assembly, in this embodiment, the first fluid tube 111 and the second fluid tube 112 are integrated into a single fitting on the same side of the base 1. Only one combined connector is needed externally to simultaneously connect the two independent fluid channels. This reduces the preoperative tubing assembly process from two separate insertions to a single, rapid connection, effectively shortening preoperative preparation time. Furthermore, concentrating the peripherally extending tubing on one side helps prevent multiple tubing from becoming scattered, entangled, or interfering with each other around the trocar during surgery. This effectively reduces the risk of cannula dislodgement or seal failure due to accidental pulling, ensuring the safety of the surgical procedure.

[0059] Example 3 In this embodiment, please refer to the following: Figure 8 and Figure 9 When the second fluid pipe 112 and the first fluid pipe 111 are arranged to cross each other, a separate passage is separated from the inside of the first fluid pipe 111 to the second fluid pipe 112 by setting an isolation member 114 at the intersection. The passage is connected to the protruding chamber 52 formed on the flange 51 of the sleeve 5. The protruding chamber 52 is connected to the second fluid channel M2 below the flange 51.

[0060] As an example, such as Figure 9 As shown, the second fluid pipe 112 is connected to the first fluid pipe 111, and an isolation structure is provided at the junction to form a passage that communicates with the second fluid pipe 112 at the junction. This passage communicates with the protruding chamber 52 on the sleeve 5, and communicates with the second fluid channel M2 below the flange 51 of the sleeve 5 through the protruding chamber 52.

[0061] Therefore, a cross arrangement is adopted, allowing the second fluid tube 112 to flow into the first fluid tube 111 from one side. The outward orientation of the second fluid tube 112 can be flexibly adjusted according to actual usage requirements, so that the tube outlet can avoid interference from other instruments during the operation. At the same time, it does not require increasing the axial length of the base 1 as in the coaxial scheme of the above embodiment 2, nor does it require expanding the radial span as in the two-sided scheme, which is beneficial to improving space utilization.

[0062] The isolator 114 at the intersection creates an independent, dedicated passageway from the inside of the first fluid pipe 111, allowing the two fluids to be separated within the intersection section before entering the seat 1, thus preventing fluid cross-flow or turbulence caused by pressure differences at the intersection point. The second fluid pipe 112, after passing through this independent passageway, first connects to the raised chamber 52 formed on the flange 51 of the sleeve 5, and then bends from the raised chamber 52 to enter the second fluid channel M2 below the flange 51. This design cleverly transforms the originally required curved channel machined inside the seat 1 into a raised chamber 52 formed by the structure of the flange 51 itself. This means that there is no need to create oblique deep holes within the wall thickness of the seat 1, nor is it necessary to add additional deflecting sealing pipes; the passageway reversal is achieved solely through the local structure on the sleeve 5, effectively simplifying the mold structure of the seat 1, thereby reducing the number of parts and lowering manufacturing costs.

[0063] For the internal structure of the tube seat 13, please refer to one embodiment of this application. Figure 2 and Figure 7 Inside the tube seat 13, the installation position of the end of the middle tube 3 is higher than the installation position of the end of the outer tube 2 to form a first height difference L1.

[0064] Correspondingly, an opening 133 is formed at the junction of the inner and outer circular steps 132 inside the tube seat 13, at the first height difference L1. The middle tube 3 and the outer tube 2 at the location of the opening 133 form the first channel port M31 of the third fluid channel M3, which communicates with the third fluid tube 131 in the tube seat 13.

[0065] In this way, the axial height difference between the ends of the middle tube 3 and the outer tube 2 is used to match and seal the shape of the inner and outer circular steps 132 inside the tube seat 13. The first channel opening M31 corresponds exactly to the connection point of the inner and outer circular steps 132, and then communicates with the third fluid tube 131 through the opening 133.

[0066] After the gas from the third fluid tube 131 enters the tube seat 13, it is evenly dispersed into the annular chamber between the middle tube 3 and the outer tube 2 through the wide first channel opening M31. 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 middle 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.

[0067] Furthermore, by setting the mounting position of the middle tube 3 higher than that of the outer tube 2, and with the opening 133 located at this height difference, the airflow entering the annular chamber will be blocked by the protruding part of the middle tube 3 and naturally flow downwards into the first channel opening M31, eliminating the need for additional guide ribs or deflection joints. Simultaneously, since the middle tube 3 and the outer tube 2 are respectively fixed on 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.

[0068] For the specific structure of the base 1, please refer to one embodiment of this application. Figure 10 and Figure 11 The puncture device cannula also includes a locking cap 6 mounted on the outer seat 11, the inner wall of the outer seat 11 having multiple locking holes 115 and / or several vertical locking grooves 116.

[0069] The locking cover 6 includes a locking body 61 and / or a vertical locking block 62. The locking body 61 preferably has a hook. The locking body 61 is used to engage with the plurality of locking slots 115 to achieve installation and fixation. The vertical locking block 62 is used to engage with the plurality of vertical locking grooves 116 to serve as an installation guide.

[0070] The plurality of vertical locking slots 116 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 opposing vertical locking grooves 116; in a corresponding manner, as Figure 8 As shown, the locking cover 6 has the same number of vertical locking blocks 62 as the vertical locking grooves 116 and corresponding in position.

[0071] Thus, the locking cover 6 is quickly installed and fixed by engaging with the locking port 115 on the inner wall of the outer seat 11 through the locking body 61; at the same time, the vertical locking block 62 engages with the vertical locking groove 116, thereby limiting the circumferential rotational freedom of the locking cover 6 when it is pushed in, thus serving as a guide during installation. This simplifies the installation operation of the locking cover 6, shortens the assembly cycle, and improves assembly efficiency.

[0072] Both the locking port 115 and the vertical locking groove 116 are located on the inner wall of the outer seat 11, forming a concealed structure. The locking body 61 and the vertical locking block 62 that cooperate with it are also located inside the locking cover 6. 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 dimensions, effectively avoiding volume redundancy caused by exposed fixing structures, and facilitating wiping and disinfection, reducing contaminant residue, and meeting the requirements of aseptic surgical procedures.

[0073] Preferably, please refer to Figure 12 The top outer edge of the locking cover 6 is surrounded and flush with the top inner edge of the outer seat 11.

[0074] Thus, the outer edge of the locking cover 6 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.

[0075] Furthermore, the edge of the locking cover 6 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 6 in the axial direction. When intra-abdominal pressure acts on the inner tube 4, middle tube 3, and outer tube 2 during surgery, generating a force that pushes the locking cover 6 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 6 itself to bear the load. This nested, enveloping force-bearing mode makes it difficult for the locking cover 6 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.

[0076] For the specific structure of the seat 11, please refer to one embodiment of this application. Figure 12 and Figure 13 The puncture cannula also includes a sealing assembly 7, which is installed inside the outer seat 11 and located between the inner seat 12 and the locking cap 6.

[0077] When the sealing assembly 7 is installed inside the outer seat 11, the sealing assembly 7 covers the edge of the inner seat 12 and extends into the cavity of the inner seat 12, forming an interlocking and fixing structure.

[0078] The sealing assembly 7 includes multiple sealing elements arranged coaxially. In this embodiment, as shown... Figure 13As shown, the sealing assembly 7 includes a first sealing element 71 and a second sealing element 72 stacked on top of each other. Preferably, a first protrusion 711 is provided at the bottom of the upper first sealing element 71, and a groove 721 for the first protrusion 711 to be inserted into the lower second sealing element 72, 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 711 and the sidewall of the groove 721 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 711 and the groove 721, 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 72 is also provided with a second protrusion 722 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.

[0079] In this way, the sealing component 7 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. Utilizing the outer contour of the sealing component 7 itself, it forms an interlocking fit with the edge of the inner seat 12 and the inner wall of the cavity, which can be reliably fixed without additional fixing parts, effectively simplifying the assembly structure and improving assembly efficiency.

[0080] The structure of the locking cover 6 is further optimized to ensure the installation and fixation of the sealing assembly 7. Please refer to one embodiment of this application as well. Figure 11 and Figure 12 The locking cover 6 includes a circular ring 63 extending downward around the central hole 60, which can be used to restrict the movement of the sealing assembly 7 between the inner seat 12 and the locking cover 6.

[0081] In this embodiment, the locking cover 6 has a central hole 60 for the piercing core to pass through, and the bottom of the locking cover 6 has a circular ring 63, which is coaxially arranged with the central hole 60 and extends downward, so as to restrict the sealing assembly 7 disposed between the inner seat 12 and the locking cover 6.

[0082] In this way, by utilizing the axial height of the downward-extending circular ring 63 on the locking cover 6, when the locking cover 6 is engaged, it directly presses against the top surface of the sealing assembly 7 to form a fixed-stroke limit. Regardless of how the overall thickness of the seal fluctuates within a small range, the circular ring 63 can ensure that it obtains a stable and preset compression deformation, effectively ensuring the fixing effect and airtightness.

[0083] The circular ring 63 on the locking cover 6 is coaxially arranged around the central hole 60 of the locking cover 6. The inner or outer wall of the circular ring 63 is radially close to or adjacent to the outer edge of the sealing assembly 7, which is equivalent to setting up a fence around the sealing assembly 7. When the sealing assembly 7 is subjected to the lateral force of the puncture core, the circular ring 63 directly bears the radial component force, preventing the overall displacement of the sealing assembly 7, and effectively ensuring that the multiple seals can always remain coaxially aligned with the central hole 60.

[0084] In this embodiment, please refer to the following: Figure 11 and Figure 12 The locking cover 6 also includes several reinforcing blocks 64, which are disposed between the circular ring 63 and the central hole 60 and are integrally connected to the locking cover 6. These reinforcing blocks 64 also limit the movement of the sealing assembly 7 between the inner seat 12 and the locking cover 6, and can increase the structural strength of the locking cover 6.

[0085] As can be seen, the reinforcing blocks 64 can be two or more, and the multiple reinforcing blocks 64 are radially distributed between the circular ring 63 and the central hole 60 to form a reinforcing skeleton. This helps to transform the load-bearing area at the top of the locking cover 6 from a solid surface into a lightweight frame structure, allowing for a significant reduction in wall thickness of the central hole 60 and the circular ring 63 while maintaining the same bending strength. This not only makes the entire locking cover 6 lighter and more economical in terms of material, but also eliminates the need for any outward or upward protrusions, effectively reducing volume and simplifying the structure.

[0086] The reinforcing blocks 64 on these locking covers 6 can act as radial force transmission bridges connecting the circular ring 63 and the wall of the central hole 60, dispersing the bending stress originally concentrated at the root of the circular ring 63 or the edge of the central hole 60 to these multiple reinforcing blocks 64, effectively reducing local peak stress. This allows the locking covers 6 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.

[0087] The aforementioned trocar cannula, as a basic component, can be used in combination with a balloon in practical applications. Please refer to... Figure 14 This application embodiment also provides a balloon puncture cannula that can simultaneously inflate and aspirate fluid, including a balloon 8 and the aforementioned puncture cannula 100 with three tubes. The third fluid tube 131 is provided with a one-way valve 134, which is used to inflate or aspirate fluid into the balloon 8.

[0088] Therefore, the one-way valve 134 for inflating the balloon 8 is located inside the third fluid tube 131 of the seat body 1, and the balloon 8 inflation function is fully integrated into the seat body 1. The operator only needs to connect the air supply component to the third fluid tube 131 of the seat body 1 to independently complete the inflation or deflation of the balloon 8. By integrating the three air ports on the seat body 1 (i.e., the first fluid tube 111 and the second fluid tube 112 for pneumoperitoneum, and the third fluid tube 131 for balloon 8) into the seat body 1, the risk of cross-inflation is effectively eliminated, while the structure is greatly simplified to a single, integrated seat body 1.

[0089] In this embodiment, please refer to the following: Figure 14 , Figure 15 and Figure 16 The middle pipe 3 and the outer pipe 2 form a second height difference L2 at the end away from the seat body 1. The middle pipe 3 and the outer pipe 2 at the location of the second height difference L2 form the second channel port M32 of the third fluid channel M3.

[0090] The balloon 8 is positioned at the second channel opening M32, and the two ends of the balloon 8 fix and seal the middle tube 3 and the outer tube 2 located at the second channel opening M32. The third fluid tube 131 is in fluid communication with the balloon 8 through the third fluid channel M3.

[0091] like Figure 15 and Figure 16 As shown, at the end of the middle tube 3 and the outer tube 2 located away from the seat body 1, a part of the balloon 8 is sealed and fixed to the outer tube 2, and another part of the balloon 8 is sealed and fixed to the protrusion of the middle tube 3 extending from the end of the outer tube 2, so that the second channel port M32 of the third fluid channel M3 located at that end is connected to the balloon 8.

[0092] On one hand, the balloon 8 directly utilizes the outer wall of the outer tube 2 and the protrusion of the middle tube 3 as its mounting base, allowing the balloon 8 to be integrally connected with the middle 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 8, 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.

[0093] On the other hand, part of the balloon 8 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 middle tube 3. This fixing method, while installing the balloon 8, completely seals the second channel opening M32 at the distal end of the annular gap between the middle 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 balloon 8, effectively guaranteeing the sealing effect and improving the inflation speed of the balloon 8.

[0094] Thus, a second height difference L2 is formed at the end of the middle tube 3 and the outer tube 2 away from the seat body 1, and the end of the middle tube 3 extending out of the outer tube 2 naturally forms the second channel opening M32 of the annular chamber. The balloon 8 directly covers this second channel opening M32, making the entire fluid path from the third fluid tube 131 of the seat body 1, the annular chamber between the middle tube 3 and the outer tube 2, and the inner cavity of the balloon 8 connected. The inflation medium can rush into the balloon 8 at high speed, which makes the inflation or deflation response of the balloon 8 faster, thereby improving the efficiency of adjusting the size of the balloon 8 during surgery.

[0095] In this embodiment, please refer to Figure 14 The outer seat 11 includes a valve body 117 integrally formed from the same material as the first fluid pipe 111 or the second fluid pipe 112, and a rotary valve 118 is provided inside the valve body 117.

[0096] In this way, the rotary valve 118 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.

[0097] The valve body 117, 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 117 and the seat 1. The rotary valve 118 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 11.

[0098] Please refer to the embodiments in this application as well. Figure 17 and Figure 18 The first fluid tube 111 is used to fill fluid and the second fluid tube 112 is used to extract fluid; or, the first fluid tube 111 is used to extract fluid and the second fluid tube 112 is used to fill fluid.

[0099] As an example, in one embodiment, such as Figure 17 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 first fluid channel M1 inside the inner pipe 4. Similarly, the second fluid pipe 112 on the seat 1 is used to extract the fluid, and the fluid is extracted along the second fluid channel M2 between the inner pipe 4 and the middle pipe 3.

[0100] As an example, in another embodiment, such as Figure 18As 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, which is drawn out along the first fluid channel M1 inside the inner pipe 4. Similarly, the second fluid pipe 112 on the seat 1 is used to fill fluid, which reaches the target location along the second fluid channel M2 between the inner pipe 4 and the middle pipe 3.

[0101] Thus, this solution cleverly utilizes the first fluid channel M1 inside the inner tube 4 and the second fluid channel M2 in the annular cavity between the inner tube 4 and the middle tube 3. The two channels are controlled by the valve body 117 on the first fluid pipe 111 and the second fluid pipe 112 on the seat body 1, so as to realize the free switching of fluid inlet and outlet channels. Furthermore, these two channels are independently set with the third fluid channel M3 used to set the guiding balloon 8, without interfering with each other and operating independently, effectively improving the flexibility of use.

[0102] As an example, please combine Figure 14 and Figure 17 When needed during surgery, the first fluid tube 111 can be connected to the irrigation fluid source, the second fluid tube 112 to the negative pressure suction, and the third fluid tube 131 to the inflation device supplying air to the balloon 8. The first fluid channel M1 inside the inner tube 4 provides a low-resistance channel for the irrigation fluid to directly reach the target site, while the annular chamber of the second fluid channel M2 provides a high-flow suction path. The third fluid channel M3 is used solely for inflating the balloon 8. This allows the trocar cannula 100 to switch between multiple modes such as irrigation, suction, and inflation via an external valve without being removed, reducing the number of instrument exchanges during surgery, thereby lowering the risk of puncture trauma and infection, and effectively improving surgical outcomes.

[0103] In another embodiment of this application, please refer to Figure 19 This application embodiment also provides a puncture device assembly including a puncture core 200 and the aforementioned puncture device cannula 100 with three tubes; or, as... Figure 20 As shown, it includes a puncture core 200 and the aforementioned balloon puncture cannula capable of simultaneously inflating and deflating fluid.

[0104] Therefore, regardless of whether the puncture core 200 is combined with any of the above-mentioned puncture device cannulas 100, the puncture core 200 only needs to cooperate with the inner lumen of the inner tube 4 for guidance, and the outer diameter of the cannulas 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.

[0105] The second fluid channel M2 and the third fluid channel M3 in the trocar cannula 100 are respectively formed by annular chambers between the inner tube 4 and the middle tube 3, and between the middle tube 3 and the outer tube 2. The equivalent flow cross-sectional area of ​​these annular chambers is much larger than that of the slender channels in traditional tube walls, and the airflow distribution is more uniform. When gas flows through these two fluid channels, 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.

[0106] For the structure of the trocar cannula provided in this application embodiment, please refer to another embodiment of this application. Figure 21 and Figure 22 The puncture device cannula includes a seat 1', an outer tube 2', and an inner tube 4'.

[0107] The base 1' includes an outer base 11', an inner base 12', and a tube base 13', and the outer base 11', inner base 12', and tube base 13' are arranged coaxially and integrally formed from the same material.

[0108] 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 a first opening 121' is provided on the side wall of the inner seat 12', which is connected to the first fluid pipe 111'.

[0109] Please refer to the following: Figure 22 and Figure 23 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 the opening 133' communicates with the second fluid tube 131'. This can be understood as the tube seat 13' having two circular steps 132' of different diameters on its inner sidewall, wherein the diameter of the inner circular step is smaller than that of the outer circular step.

[0110] It should be noted that the fluid flowing through the first fluid pipe 111' and the second fluid pipe 131' can be air, carbon dioxide, or a liquid. In this embodiment, a gas is used as an example.

[0111] Please refer to the following: Figure 22 , Figure 23 and Figure 24 The inner tube 4' and outer tube 2' can preferably be made of plastic or metal. The ends of the inner tube 4' and the outer tube 2' are fixed at different heights and sealed on the two circular steps 132'. This can be understood as, as... Figure 2 As shown, the inner tube 4' is longer than the outer tube 2', so that after the inner tube 4' and the outer tube 2' are connected, the two ends of the inner tube 4' extend from the two ends of the outer tube 2', thus forming different height differences L1' and L2' at the two ends.

[0112] Among them, such as Figure 24 As shown, a certain distance is provided between the inner tube 4' 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 22 and Figure 25 As shown, the height difference L1' between one end of the inner tube 4' and the outer tube 2' corresponds to the position of the fluid channel port M1', which is the connection point of the inner and outer circular steps 132', and is simultaneously connected to the second fluid tube 131' through the opening 133'.

[0113] Therefore, the trocar cannula of this application embodiment includes a seat 1', an outer tube 2', and an inner tube 4'. The inner tube 4' 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 4' 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.

[0114] The fluid channel M' consists of an annular chamber between the inner tube 4' 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 this 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.

[0115] Furthermore, the trocar cannula provided in this application integrally molds the outer seat 11', inner seat 12', tube seat 13', first fluid tube 111', and second fluid tube 131' from the same material, and seals them together with the inner tube 4' 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.

[0116] Regarding the structures on the inner tube 4' and outer tube 2' mentioned above, please refer to one embodiment of this application. Figure 22 , Figure 24 and Figure 25 Inside the tube seat 13', the installation position of the end of the inner tube 4' is higher than the installation position of the end of the outer tube 2' so as to form a first height difference L1'.

[0117] 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 4' 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' in the tube seat 13'.

[0118] In this way, by utilizing the axial height difference between the ends of the inner tube 4' and the outer tube 2', the tube seat 13' is fitted with and sealed to the inner and outer circular steps 132' inside the tube seat 13'. 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'.

[0119] 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 4' 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 4' and the outer tube 2' to be as thin as possible, just meeting the strength requirements, making the puncture operation smoother and effectively reducing puncture trauma.

[0120] Furthermore, by setting the mounting position of the inner tube 4' higher than that of 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 4' and flows downward into the first channel opening M1', eliminating the need for additional guide ribs or deflection joints. Simultaneously, since the inner tube 4' 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.

[0121] 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 26In the embodiments of this application, a balloon puncture cannula is provided, including the aforementioned puncture cannula 100' and balloon 8'. A one-way valve 134' is provided in the second fluid tube 131' on the seat 1'. The one-way valve 134' is used to inflate or aspirate fluid into the balloon 8'.

[0122] Thus, the balloon 8' is positioned at the distal end of the cannula (a combination of the inner tube 4' and the outer tube 2'), and its fluid path utilizes the wide annular chamber between the inner tube 4' 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 limit, effectively minimizing tissue tearing and compression trauma during the puncture process, thereby reducing the risk of puncture trauma.

[0123] Furthermore, by incorporating the one-way valve 134' for inflating the balloon 8' within the second fluid tube 131' of the seat body 1', the balloon 8' inflation function is fully integrated into the seat body 1'. The operator can independently inflate or deflate the balloon 8' simply by connecting the air supply component to the second fluid tube 131' of the seat body 1'. Integrating both air ports on the seat body 1' (i.e., the first fluid tube 111' for pneumoperitoneum and the second fluid tube 131' for the balloon 8') into the seat body 1' effectively eliminates the risk of cross-inflation and significantly simplifies the structure into a single, integrated unit 1'.

[0124] Because the inflation path of balloon 8' is an annular chamber between the inner tube 4' 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 134' within the second fluid tube 131', gas rapidly inflates balloon 8' 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 134' is opened for reverse aspiration, and the efficient flow-guiding capacity of the annular chamber causes balloon 8' to collapse rapidly. This significantly shortens surgical preparation and termination time while avoiding the risk of local ischemic damage caused by prolonged tissue compression from balloon 8', effectively ensuring surgical outcomes.

[0125] In this embodiment, please refer to the following: Figure 22 , Figure 26 and Figure 27 The inner tube 4' 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 4' and the outer tube 2' at the location of the second height difference L2' forms the second channel port M2' of the fluid channel M'.

[0126] The balloon 8' is positioned at the second channel opening M2', and the two ends of the balloon 8' fix and seal the inner tube 4' and the outer tube 2' located at the second channel opening M2'. The second fluid tube 131' is in fluid communication with the balloon 8' through the fluid channel M'.

[0127] like Figure 27 As shown, at the end of the inner tube 4' and the outer tube 2' located away from the seat body 1', a part of the balloon 8' is sealed and fixed to the outer tube 2', and another part of the balloon 8' is sealed and fixed to the protruding part of the inner tube 4' 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 8'.

[0128] On the one hand, the balloon 8' directly utilizes the outer wall of the outer tube 2' and the protrusion of the inner tube 4' as its mounting base, allowing the balloon 8' to be integrally connected with the inner and outer tubes 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 8' can fit snugly against the cannula surface when deflated, without adding any additional radial dimension. This significantly reduces the stretching force on the abdominal wall muscle fibers during puncture, further minimizing puncture trauma.

[0129] On the other hand, part of the balloon 8' 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 4'. This fixing method, while installing the balloon 8', precisely and completely seals the second channel opening M2' at the distal end of the annular gap between the inner tube 4' 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 8', effectively guaranteeing the sealing effect and improving the inflation speed of the balloon 8'.

[0130] Thus, a second height difference L2' is formed at the end of the inner tube 4' and the outer tube 2' furthest from the seat 1', and the end of the inner tube 4' extending out of the outer tube 2' naturally forms the second channel opening M2' of the annular chamber. The balloon 8' directly covers this second channel opening M2', making the entire fluid path from the second fluid tube 131' of the seat 1', the annular chamber between the inner and outer tubes 2', and the inner cavity of the balloon 8' connected. The inflation medium can rush into the balloon 8' at high speed, resulting in a faster inflation or deflation response and effectively improving the operational efficiency of adjusting the size of the balloon 8' during surgery.

[0131] In this embodiment, please refer to Figure 26 The outer seat 11' also includes a valve body integrally formed from the same material as the first fluid pipe 111', and the valve body is provided with a rotary valve 118'.

[0132] In this way, the rotary valve 118' is integrated on 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.

[0133] The valve body, the first fluid pipe 111', and the outer seat 11' are all integrally formed from the same material, meaning there are no physical seams or assembly gaps between the valve body and the seat 1'. The rotary valve 118' core is directly installed in the valve cavity formed from the original material of the seat 1'. The entire air passage from the air inlet to the first fluid pipe 111' is entirely 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'.

[0134] Example 2 Please refer to the following: Figure 28 and Figure 29 In the embodiments of this application, a puncture cannula 100' capable of simultaneously filling and withdrawing fluid is also provided, including the aforementioned puncture cannula 100', wherein a first fluid tube 111' is used for filling fluid and a 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.

[0135] As an example, in one embodiment, such as Figure 28 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 4'; 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 4' and the outer pipe 2'.

[0136] As an example, in another embodiment, such as Figure 29 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 4'; 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 4' and the outer pipe 2'.

[0137] Therefore, this solution cleverly utilizes the interior of the inner tube 4' as the first channel and the annular chamber between the inner tube 4' 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 1', so as to realize the free switching of fluid inlet and outlet channels and effectively improve the flexibility of use.

[0138] 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 4' 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 without being removed, via an external valve. This helps reduce the number of instrument exchanges during surgery, thereby reducing puncture trauma and the risk of infection, and effectively ensuring surgical outcomes.

[0139] Example 3 Please see Figure 30 In the embodiments of this application, a puncture cannula 100' with a balloon 8' that can be simultaneously inflated and deflated with fluid is also provided. It includes the puncture cannula 100' of the above embodiment 2 and a balloon assembly disposed outside the puncture cannula 100'. The balloon assembly includes a balloon 8', a fluid conduit 81, and a fluid check valve 82 that communicates with the balloon 8' through the fluid conduit 81.

[0140] Thus, the balloon 8' is connected to the fluid check valve 82 via the fluid conduit 81 to supply air to the balloon 8'. In actual operation, the balloon 8' works with the limiter to fix the trocar to the wall of the body cavity, such as the abdominal cavity or thoracic cavity, thereby preventing the trocar from slipping and ensuring the fixation effect of the trocar.

[0141] The balloon 8' is equipped with an independent fluid conduit 81 and a fluid check valve 82, which are separate from the trocar cannula 100'. The inflation, pressure holding, and deflating processes of the balloon 8' do not interfere with the inlet and outlet airways within the trocar cannula 100', effectively eliminating risks such as cross-contamination and pressure interference, thereby improving reliability.

[0142] For the structure on the distal end of the cannula in this embodiment, please refer to [link / reference]. Figure 30 The space between the inner tube 4' and the outer tube 2' at the ends away from the seat 1' forms the second channel port M2' of the fluid channel M' mentioned above. The inner tube 4' and the outer tube 2' at the ends away from the seat 1' form a second height difference L2' or do not form a second height difference L2'.

[0143] As an example, in one embodiment, such as Figure 30 As shown, the inner tube 4' 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.

[0144] In another embodiment (not shown in the figure), the inner tube 4' 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.

[0145] Thus, a second channel opening M2' of the fluid channel M' is formed in the space between the inner tube 4' and the outer tube 2' at the ends away from the seat 1'. This second channel opening M2' is the first opening 121' of the complete annular cavity between the outer wall of the inner tube 4' 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 1' all the way to the far end, realizing low resistance performance throughout the entire flow channel and effectively improving gas flow efficiency.

[0146] In another embodiment of this application, please refer to the following: Figure 31 and Figure 32 This application also provides a puncture device assembly, including a puncture core 200' and the aforementioned puncture device cannula 100'; or, including a puncture core 200' and the aforementioned balloon puncture device cannula 100'; or, including a puncture core 200' and the aforementioned puncture device cannula 100' capable of simultaneously inflating and deflating fluid; or, including a puncture core 200' and the aforementioned puncture device cannula 100' with a balloon capable of simultaneously inflating and deflating fluid.

[0147] Therefore, regardless of whether the puncture core 200' is combined with any of the above-mentioned puncture device cannulas 100', the puncture core 200' only needs to cooperate with the inner lumen of the inner tube 4' 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.

[0148] The fluid channel M' in the trocar cannula 100' is formed by an annular chamber between the inner tube 4' 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.

[0149] Regarding the mounting and mating structure between the puncture core 200' and the seat 1', please refer to one embodiment of this application. Figure 31 , Figure 32 and Figure 33 The piercing core 200' is provided with a plurality of downwardly extending vertical inserts 201, and the outer seat 11' is provided with a plurality of opposing vertical cuts 119 that cooperate with the plurality of vertical inserts 201.

[0150] The term "multiple vertical inserts 201" can be understood as meaning that the number of vertical inserts 201 is two, four, or similar. For example... Figure 32As shown, in this embodiment, the puncture core 200' preferably has two symmetrically arranged vertical inserts 201; correspondingly, the number of vertical cuts 119 on the outer seat 11' matches and their positions correspond.

[0151] In this way, the insert on the puncture core 200' and the vertical incision 119 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 200' cannot rotate freely around its own axis when inserted, thereby improving the reliability of the operation during the operation.

[0152] Preferably, in this embodiment, such as Figure 32 and Figure 33 As shown, the piercing core 200' is provided with a vertical insert 201, and the outer seat 11' and the outer edge of the locking cover 6' are both provided with vertical cuts 119. Moreover, the vertical cuts 119 on the outer seat 11' and the vertical cuts 119 on the locking cover 6' are combined to form a slot for the vertical insert 201 on the piercing core 200' to be inserted.

[0153] 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 6', each with a half-cut. When the locking cover 6' is assembled in place, the cuts of the two seamlessly join 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 6'. The entire guide structure is integrated within the internal contour of the assembly formed by the locking cover 6' and the outer seat 11'. In this way, while realizing the insertion function, the overall structure is simplified, effectively reducing production costs.

[0154] 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 three tubes, characterized in that, include: A base body includes an outer base, an inner base, and a tube base, all coaxially arranged and integrally formed from the same material. The outer base has a first fluid tube and a second fluid tube integrally formed from the same material. The inner base has a first opening and a second opening on its sidewall, wherein the first opening communicates with the first fluid tube, and the second opening communicates with the second fluid tube. The tube base has a third fluid tube integrally formed from the same material. The inner sidewall of the tube base has two circular steps, one inner and one outer, and an opening is provided at the connection of the two circular steps, which communicates with the third fluid tube. The system comprises an outer tube, a middle tube, an inner tube, and a sleeve. The ends of the middle tube and the outer tube are fixed and sealed at different heights on two circular steps. A certain distance is provided between the middle tube and the outer tube to form a fluid channel, which communicates with the opening and then with the third fluid tube. The inner tube is fixed and sealed within the inner seat by the sleeve at a height higher than that of the middle tube, and a certain distance is also provided between the inner tube and the middle tube. The first fluid pipe and the cavity of the inner pipe are connected to form a first fluid channel; the second fluid pipe and the annular cavity between the middle pipe and the inner pipe are connected to form a second fluid channel; the third fluid pipe and the annular cavity between the middle pipe and the outer pipe are connected to form a third fluid channel; and these three fluid channels are separated from each other.

2. The trocar cannula with three tubes according to claim 1, characterized in that, The sleeve includes a flange that is sealed to the inner seat. The inner seat has multiple support arms on its tube wall to support the flange. The lower part of the sleeve is sealed to the inner tube. The space between the lower part of the sleeve flange and the outer wall of the sleeve, the outer wall of the inner tube and the outer wall of the middle tube constitutes a second fluid channel.

3. The trocar cannula with three tubes according to claim 2, characterized in that, The second fluid pipe is located outside the first fluid pipe, inside the first fluid pipe, or intersecting with the first fluid pipe.

4. The trocar cannula with three tubes according to claim 3, characterized in that, When the second fluid tube is located outside the first fluid tube, the second fluid tube is located on the outer seat, bypassing the first fluid tube, and the second fluid tube passes through the outer seat and the inner seat to communicate with the second fluid channel; When the second fluid tube is disposed inside the first fluid tube, a separator is provided in the first fluid tube so that the second fluid tube can communicate with the lower part of the flange of the sleeve, and thus communicate with the second fluid channel; When the second fluid pipe is arranged to cross the first fluid pipe, a separate passage is separated from the inside of the first fluid pipe to the second fluid pipe by setting an isolation member at the intersection. The passage communicates with the protruding chamber formed on the flange of the sleeve, and the protruding chamber communicates with the second fluid channel below the flange.

5. The trocar cannula with three tubes according to claim 1, characterized in that, Inside the tube seat, the installation position of the end of the middle 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 middle tube and the outer tube at the location of the opening form the first channel opening of the third fluid channel.

6. The trocar cannula with three tubes according to any one of claims 1 to 5, characterized in that, The puncture device cannula also includes a locking cap mounted on the outer seat. The inner wall of the outer seat has multiple locking ports and / or several vertical locking grooves. 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 grooves. The top outer edge of the locking cap is surrounded and flush with the top inner edge of the outer seat.

7. The trocar cannula with three tubes according to claim 6, 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.

8. The trocar cannula with three tubes according to claim 6, characterized in that, The locking cover includes a circular ring extending downward around a central hole, the circular ring being able to restrict the movement of the sealing assembly between the inner seat and the locking cover; 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 being 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.

9. A balloon puncture cannula capable of simultaneously filling and withdrawing fluid, characterized in that, The device includes a balloon and a trocar cannula with three tubes as described in any one of claims 1-8. The third fluid tube is provided with a one-way valve for inflating or deflating the balloon. The middle tube and the outer tube form a second height difference at one end away from the seat, and the middle tube and the outer tube at the location of the second height difference form a second channel opening of the third fluid channel. The balloon is disposed at the second channel opening, and the two ends of the balloon fix and seal the middle tube and the outer tube located at the second channel opening. The third fluid tube is in fluid communication with the balloon through the third fluid channel.

10. The balloon puncture cannula capable of simultaneously inflating and deflating fluid according to claim 9, characterized in that, The outer seat includes a valve body integrally formed from the same material as the first fluid pipe or the second fluid pipe, and a rotary valve is provided inside the valve body.

11. The balloon puncture cannula capable of simultaneously inflating and deflating fluid according to claim 9, characterized in that, The first fluid tube is used to fill fluid and the second fluid tube is used to extract fluid; or, the first fluid tube is used to extract fluid and the second fluid tube is used to fill fluid.

12. A puncture device assembly, characterized in that, It includes a puncture core and a puncture cannula with three tubes as described in any one of claims 1-8; or, it includes a puncture core and a balloon puncture cannula capable of simultaneously inflating and deflating fluid as described in any one of claims 9-11.

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