Split-flow structure, double-cannula and its fastening method, pipe structure

Abstract

The application belongs to the field of medical instrument research / manufacture, and particularly relates to a shunt structure, a double-cannula and a fastening method thereof, and a pipeline structure, more particularly to a shunt structure of a double-cannula, a double-cannula and a fastening method thereof, and a partial pipeline structure of a cryosurgery device. The shunt structure comprises a porous base, a sleeve type connecting seat and a shunt connecting seat, independent shunting of an inner tube (high pressure supply) and an outer tube (return channel) is realized through an internal communication pipe and an adapter hole, and gear adjustment is supported. The double-cannula design comprises a connecting head (integration part and connecting part), the integration part adopts an integrated head, a connecting pipe and an elastic seal to ensure integration of the inner tube and the outer tube; the connecting part uses a connecting sleeve and a positioning pin to provide fastening and alignment. The inner tube is connected with the integrated head by extrusion of an elastic fastener; the connecting sleeve is screwed to the base to realize reliable fixing of the high pressure pipeline. The method is applied to the pipeline structure, and the flexibility is enhanced in combination with the outer tube sheath.

Description

Technical Field

[0001] This application belongs to the field of medical device research / manufacturing, specifically relating to a shunt structure, a double-walled tube and its fastening method, a tubing structure, and more specifically to a double-walled tube shunt structure, a double-walled tube and its fastening method, and a partial tubing structure of a cryosurgery device. Background Technology

[0002] A cryosurgery device is a medical device that uses cryotherapy to destroy diseased tissue (such as tumors). Its working principle is primarily based on the expansion or evaporation of a refrigerant: a high-pressure refrigerant (such as argon, nitrogen, or carbon dioxide) is delivered from a refrigerant generator to the probe tip via a connecting tube, generating a low-temperature effect within the probe. This, in turn, reduces the probe temperature through heat exchange, allowing for precise cryotherapy of the lesion. This device is widely used in tumor ablation, skin lesion removal, and other fields, offering advantages such as being minimally invasive and radiation-free.

[0003] In existing technologies, cryosurgery devices often employ a double-tube (coaxial tube design, where an inner tube is nested within an outer tube) connection to the refrigerant generator. Compared to two separate tubes (separate supply and return lines), this design offers several advantages: (1) more uniform cooling distribution, avoiding uneven local cooling; (2) higher heat transfer efficiency, enhanced heat exchange through turbulence; (3) compact structure, easy integration into the probe, reducing heat loss; and (4) better safety and reliability, reducing the risk of leakage. These advantages make the double-tube design the mainstream choice, where the inner tube delivers high-pressure refrigerant, and the outer tube forms a return channel and is thermally connected to the probe shell to achieve efficient cooling.

[0004] However, existing dual-tube connection solutions still have significant shortcomings: First, in actual use, the device needs to be frequently moved, picked up, and placed, causing the tubing to be pulled. Existing connections are often insufficiently strong, easily loosening or breaking, especially since the inner tube carries high-pressure refrigerant (pressures can reach several MPa), requiring extremely high connection strength. Second, the tubing needs to have a certain degree of extensibility and flexibility to adapt to surgical movements, but traditional rigid connections (such as simple welding or snap-fit) are difficult to meet this requirement, easily leading to bending fatigue or sealing failure. Third, to achieve level adjustment (controlling freezing intensity), the device needs internal tubing diversion, but the lack of a matching diversion structure leads to complex diversion, low efficiency, and even gas crossflow or pressure instability. These problems not only affect the reliability and safety of the device but may also increase surgical risks, prolong operation time, and increase maintenance costs.

[0005] Therefore, it is necessary to develop a new type of double-tube diversion structure and matching connection scheme to solve the above-mentioned technical problems and improve the overall performance of cryosurgery devices. Summary of the Invention

[0006] To address the aforementioned technical problems, this application provides a new technical solution, as follows:

[0007] A double-tube diversion structure includes a porous base and accessories. The porous base is provided with a double-tube connector and two diversion connectors. The diversion connectors include a first diversion connector and a second diversion connector.

[0008] A first connecting pipe and a second connecting pipe are respectively opened at the double-pipe connection seat. The first connecting pipe is connected to the first branch seat, and the second connecting pipe is connected to the second branch seat.

[0009] The first connecting pipe and the second connecting pipe are opened inside the porous base and extend to the outer wall;

[0010] The double-sleeve connector includes a sleeve-type connector disposed below the porous base, wherein a first connecting hole is opened at the center of the bottom of the sleeve-type connector, and the first connecting hole extends through and points towards the first diverter seat;

[0011] A second connecting hole is opened on one side of the first connecting hole. The second connecting hole, after being bent, extends parallel to the direction of the first connecting hole to the second distributor seat. The sleeve-type connecting seat facilitates the connection between the double sleeve and the sleeve. If necessary, a threaded connection or locking method can be used for fastening.

[0012] The double-tube connection is on the sleeve-type connecting seat. The inner tube is connected to the first diverter seat through the first connecting pipe, and the outer tube is connected to the second diverter pipe through the second connecting pipe, thus realizing the diversion of the double-tube connection, and then connecting to the gear adjustment component through the pipeline.

[0013] Furthermore, a transition hole is opened on the side wall of the porous base. The central axis of the transition hole extends beyond the bottom of the sleeve-type connector, and the hole wall of the transition hole is not connected to the bottom of the sleeve-type connector. This facilitates the connection to the transition hole when the second connecting hole is opened. The depth of the transition hole ends at a position where it does not connect with the first connecting hole, with a certain distance between them. This ensures that the second connecting hole, which is formed by the transition hole as an intermediate structure, does not intersect with the first connecting hole, thus achieving the separation of the first connecting pipe and the second connecting pipe.

[0014] A through hole is opened on the second distributor seat. The through hole is set parallel to the first connecting hole and extends to the transition hole. The opening at the beginning of the second connecting hole also extends to the transition hole. The through hole, the middle part of the transition hole, and the second connecting hole together form the second connecting pipe.

[0015] Furthermore, the sleeve-type connecting seat is provided with an elastic seat. The elastic seat has a central hole aligned with the first connecting hole and a side hole aligned with the second connecting hole. The elastic seat is provided with a mounting shaft connected to the multi-hole base. A positioning hole is provided at the connection between the elastic seat and the bottom surface of the sleeve-type connecting seat. The mounting hole and the positioning hole are coaxially connected. The inner diameter of the front end of the positioning hole is enlarged. The mounting shaft is a connecting screw that passes through the positioning hole and connects to the mounting hole. That is, the positioning hole can be used to install the connecting screw and can also facilitate the insertion of the positioning pin on the double sleeve, realizing multiple uses of one hole.

[0016] The outer surface of the flexible seat has, in sequence, a side hole, a center hole, and a positioning hole. The flexible seat provides a certain degree of sealing when connecting pipelines, effectively preventing cross-flow of gas between two pipelines.

[0017] Furthermore, the structure also includes an internal tube disposed within the first connecting hole. One end of the internal tube is located within the first diverter seat and is engaged with multiple holes within the diverter seat. The other end extends beyond the outer plane of the elastic seat. The extended portion serves as a connecting part and docks with the inner tube of the double-sleeve tube.

[0018] Furthermore, a plug is installed at the opening of the adapter hole to form a closed air passage.

[0019] Both the first and second branch seats are equipped with connecting sleeves, which facilitate the connection of pipelines to the gear adjustment assembly.

[0020] This application also provides a double-sleeve tube, which is provided with a nested outer tube and an inner tube. One end of the double-sleeve tube is provided with a connector that is connected to the aforementioned diversion structure. The connector includes a connecting part and an integrating part. The integrating part is used to integrate the inner tube and the outer tube, and the connecting part is used to connect the double-sleeve tube to the diversion structure.

[0021] The integration department includes:

[0022] The integrated head includes an embedding hole in the middle and a through hole on one side of the embedding hole. Both the embedding hole and the through hole penetrate the integrated head. The embedding hole is used for embedding the internal tube. The embedding hole is a multi-stage (multi-segment hole). An elastic seal is provided at the connection between the end of the internal tube and the embedding hole, which plays a sealing role after embedding.

[0023] The connecting tube has its upper end wrapped around the lower end of the integrated head and is sleeved with the integrated head. Its lower end is embedded in the outer tube, and its outer wall is tightly fitted with the inner wall of the outer tube. A channel cavity is formed between the inner wall of the connecting tube and the outer wall of the inner tube for gas return.

[0024] The connecting part includes:

[0025] A connecting sleeve is provided. One end of the connecting sleeve wraps around the upper part of the connecting tube. That is, the bottom of the connecting sleeve is provided with an inward-facing circumference. The circumference supports the upper part of the connecting tube. When connecting the other end to the aforementioned sleeve-type connecting seat, the connecting tube is pulled closer to the sleeve-type connecting seat.

[0026] A locating pin is located on one side of the integrated head and is used to embed into the locating hole mentioned above. The integrated head is cylindrical and coaxially engages with the sleeve-type connecting seat. The internal tube is embedded in the tube. By setting the locating pin, the relative rotation of the integrated head with the sleeve-type connecting seat is prevented, so that the through hole (located on the integrated head) and the side hole (located on the elastic seat) are aligned.

[0027] Furthermore, the end of the integrated head is provided with a protruding fastening sleeve, the inner tube passes through the fastening sleeve, and a matching sleeve is sleeved on the inner tube. The matching sleeve is connected to the fastening sleeve, and the bottom of the matching sleeve is provided with an inward-facing annular boss. The inner tube and the integrated head are fastened by screwing it onto the fastening sleeve.

[0028] Furthermore, an inclined annular circumferential surface is provided at the end of the fastening sleeve near the outer wall of the inner tube, and an elastic fastener is provided between the fastening sleeve and the mating sleeve. An inclined surface parallel to the inclined annular circumferential surface is provided at the position opposite to the fastening sleeve of the elastic fastener, and it gradually embeds into the inclined annular circumferential surface during the fastening process.

[0029] The bottom of the sleeve is provided with a support platform for supporting the bottom end of the elastic fastener. This support platform is the aforementioned annular boss. By twisting and pressing the elastic fastener, the connection between the inner tube and the integrated head is made more secure.

[0030] Furthermore, a boss is provided near the end of the integrated head, and an enlarged hole is provided at the front end of the connecting tube to mate with the boss. The outer contour of the enlarged hole contacts and connects with the annular boss at the bottom of the connecting sleeve. The connecting sleeve is fitted with the sleeve-type connecting seat, and the double sleeve and the diversion structure are tightened by screwing.

[0031] Furthermore, it also includes an outer tube sheath that covers the connection between the outer tube and the connecting tube. In the above structure, the connecting tube body can be made of a material with a certain degree of elasticity, and its outer wall is connected to the inner wall of the outer tube by adhesive bonding. The outer tube sheath is bonded to the connection between the two, reducing the risk of the connecting tube detaching from the outer tube.

[0032] This application also provides a two-stage fastening method, which includes using a fastening sleeve and a connecting sleeve to fasten a high-pressure pipeline.

[0033] The high-pressure pipeline is an inner tube. The inner tube is embedded in the integrated head and connected to the integrated head by a compression fastener. Then, the integrated head with the high-pressure inner tube is fastened to the sleeve-shaped base through a connecting sleeve.

[0034] In this design, the connections between the connecting sleeve and the fastening sleeve and their mating parts are all threaded. This two-stage fastening method makes the high-pressure pipeline connection more reliable.

[0035] This application also provides a partial (“partial” means that these tubings are only a portion of all the tubings in the cryosurgery device) tubing structure, including the aforementioned shunt structure and a double-walled tube of 10.

[0036] Furthermore, the double-sleeve pipe in this pipeline structure utilizes the aforementioned two-stage fastening method.

[0037] The beneficial effects of this application are as follows:

[0038] Based on the technical solution provided in this application (dual-tube shunt structure, dual-tube design, two-stage fastening method, and partial tubing structure applied to cryosurgery devices), this application mainly addresses the shortcomings of existing technologies, such as insufficient connection strength, poor flexibility, weak sealing, and inconvenient shunt, to achieve a more reliable, efficient, and safe cryosurgery device tubing system. Specifically:

[0039] 1. Through the double-tube connector and the shunt connector (first shunt and second shunt) on the porous base, the inner tube and the outer tube are connected to independent channels, which facilitates the connection of the double-tube shunt to the level adjustment component, supports multi-level freezing intensity adjustment, and improves the operational flexibility and treatment precision of the device.

[0040] 2. The use of sleeve-type connectors, threaded or locking fasteners, and a two-stage fastening method (first using elastic fasteners to squeeze the inner tube to connect with the integrated head, and then fastening it to the base through the connecting sleeve) is particularly suitable for high-pressure gas inner tubes, ensuring that the connection can withstand high pressure without loosening, and reducing the risk of pipeline breakage or failure caused by moving, picking up or placing.

[0041] 3. The structural design (such as the use of elastic materials for the connecting tubes) gives the tubing a certain degree of extensibility and flexibility, adapting to various movements of the cryosurgery device during surgery (such as traction and bending), avoiding damage or inconvenience caused by rigid connections. At the same time, the outer tube sheath further strengthens the stability of the connection and reduces the risk of detachment.

[0042] 4. The flexible seat provides a sealing effect to prevent gas cross-flow; the flexible seal in the integrated part forms a closed gas path; the positioning pin ensures that the holes are aligned to avoid leakage caused by rotation; the overall design reduces gas escape, enhances safety and refrigerant utilization efficiency, and is suitable for low temperature and high pressure environments.

[0043] 5. The internal through-pipe design of the porous base (such as the first connecting pipe, the second connecting pipe, and the adapter hole) simplifies the assembly process. One hole can be used for multiple purposes (the positioning hole can accommodate both screw installation and positioning pin insertion), reducing manufacturing complexity. The extension of the built-in pipe facilitates docking, and the connecting sleeve facilitates pipeline expansion. Overall, the number of external connecting parts is reduced, improving the portability and maintenance efficiency of the device.

[0044] 6. Reliable shunt and fastening reduce the risk of accidental injury during surgery (such as frostbite caused by refrigerant leakage); suitable for some tubing of cryosurgery devices, compatible with existing systems, potentially reducing production costs and energy consumption, while extending the life of the device. Attached Figure Description

[0045] Figure 1 This is a front view schematic diagram of the porous base according to Embodiment 1 of this application;

[0046] Figure 2 This is a left view of the porous base according to Embodiment 1 of this application;

[0047] Figure 3 for Figure 2 A sectional view along the EE direction;

[0048] Figure 4 This is a three-dimensional schematic diagram of the porous base according to Embodiment 1 of this application;

[0049] Figure 5 This is a three-dimensional schematic diagram of Embodiment 1 of this application;

[0050] Figure 6 This is a cross-sectional schematic diagram of Embodiment 1 of this application;

[0051] Figure 7 This is a schematic diagram of the elastic seat according to Embodiment 1 of this application;

[0052] Figure 8 This is an overall schematic diagram of Embodiment 2 of this application;

[0053] Figure 9 This is a schematic cross-sectional view of the upper half of Embodiment 2 of this application;

[0054] Figure 10 This is a schematic diagram of the integrated head according to Embodiment 2 of this application;

[0055] Figure 11 This is a schematic diagram of Embodiment 3 of this application;

[0056] Figure 12 This is a front view schematic diagram of Embodiment 4 of this application;

[0057] Figure 13 This is a three-dimensional schematic diagram of Embodiment 4 of this application;

[0058] Figure 14 This is a schematic diagram of the internal structure of Embodiment 4 of this application;

[0059] Figure 15 This is a schematic diagram of the installation position of Embodiment 4 of this application in a cryosurgery device.

[0060] In the diagram: 1. Sleeve-type connector; 2. First connecting pipe; 3. Adapter hole; 4. Plug; 5. Second connecting hole; 6. Second-stage hole; 7. Second connecting pipe; 8. Mounting hole; 9. Inlet connecting tube; 10. Outlet connecting tube; 11. Elastic seat; 12. Center hole; 13. Side hole; 14. Positioning hole; 15. Connecting screw; 16. Positioning pin; 17. Internal tube; 18. External tube; 19. Internal tube; 20. Integrated head; 21. Embedded hole; 22. Through hole; 23. Fastening sleeve; 24. Mating sleeve; 25. Annular section; 26. Elastic fastener; 27. Connecting pipe; 28. Connecting sleeve; 29. ​​Boss; 30. Outer tube sheath; 31. Gun-type handheld part. Detailed Implementation

[0061] Example 1:

[0062] like Figure 1-7 As shown, a double-tube flow splitting structure includes a porous base, the shape of which is referenced. Figure 1 , 2 As shown in Figure 4, the upper part is a multifaceted solid with parallel inner and outer surfaces, and the lower left part protrudes downwards, with the protruding part extending downwards to form a cylinder. The outer wall of the cylinder has a threaded line.

[0063] Reference Figure 3 A blind hole is made on the cylinder along its center upward to form a sleeve-type connecting seat 1, i.e., a double-sleeve connecting seat. Three-stage holes are made opposite to the blind hole. The first-stage fine hole extends to the top surface of the sleeve-type connecting seat 1. The third-stage hole serves as the first connecting pipe 22.

[0064] A transition hole 3 is made on the right side wall of the porous base. The central axis of the transition hole 3 is perpendicular to the first connecting hole. The transition hole 3 is a second-order hole 6. The first-order hole ends at the right side of the hole wall of the first connecting hole. A plug 4 is set on the second-order hole 6.

[0065] A second connecting hole 5 is opened on the top surface of the sleeve-type connecting seat 1 and to the right of the first connecting hole, extending to the transition hole 3. A second-order hole 6 is opened on one side of the third-order hole, extending to the transition hole 3. The second connecting hole, the transition hole 3, and the second-order hole 6 form the second connecting pipe 7.

[0066] A mounting hole 8 is provided on the top surface of the sleeve-type connector 1 on the left side of the first connecting pipe 22, and the inner wall of the mounting hole 8 is provided with a thread.

[0067] like Figure 5As shown, an air inlet connecting tube 9 is installed outside the first connecting pipe 22, and an air outlet connecting tube 10 is installed outside the second connecting pipe 27; (Refer to...) Figure 6 The red cross-section represents the elastic seat 11. The elastic seat 11 has a central hole 12 aligned with the first connecting hole and a side hole 13 aligned with the second connecting hole 5. The elastic seat 11 is equipped with a mounting shaft that connects to the multi-hole base. A positioning hole 14 is provided at the connection between the elastic seat 11 and the bottom surface of the sleeve-type connecting seat 1. The mounting hole 8 and the positioning hole 14 are coaxially connected. The inner diameter of the front end of the positioning hole 14 is enlarged. The mounting shaft is a connecting screw 15 that passes through the positioning hole 14 and connects to the mounting hole 8. That is, the positioning hole 14 can be used to install the connecting screw 15 and can also facilitate the insertion of the positioning pin 16 on the double sleeve, realizing multiple uses of one hole.

[0068] Reference Figure 7 The outer surface of the elastic seat 11 has a side hole 13, a center hole 12, and a positioning hole 14 in sequence. The elastic seat 11 can play a certain sealing role when connecting the 27 pipes, effectively preventing gas crossflow between the two pipes.

[0069] An internal tube 17 is disposed within the first connecting hole. One end of the internal tube 17 is located within the first diverter seat and is engaged with multiple holes within the diverter seat. The other end extends beyond the outer plane of the elastic seat 11. The extended portion serves as a connecting part and is connected to the inner tube 19 of the double-sleeved tube.

[0070] Example 2:

[0071] like Figure 8-10 As shown, a double-sleeve tube, refer to Figure 8 Its top is provided with a positioning pin 16 that corresponds to the positioning hole 14 in Embodiment 1.

[0072] The connection structure at the top of the double sleeve is as follows Figure 9 As shown, the double-tube system is provided with a nested outer tube 18 and an inner tube 19. One end of the double-tube system is provided with a connector that connects to the aforementioned diversion structure. The connector includes a connecting part and an integrating part. The integrating part is used to integrate the inner tube 19 and the outer tube 18, and the connecting part is used to connect the double-tube system to the diversion structure.

[0073] The integrated part includes an integrated head 20, which includes an embedding hole 21 located in the middle and a through hole 22 located on one side of the embedding hole 21. Both the embedding hole 21 and the through hole 22 pass through the integrated head 20. The embedding hole 21 is used for embedding the internal tube 17. The embedding hole 21 is a multi-stage (multi-segment hole). An elastic seal is provided at the connection between the end of the internal tube 17 and the embedding hole 21, which plays a sealing role after embedding. The through hole 22 is connected to the side hole 13.

[0074] A protruding fastening sleeve 23 is provided at the center of the end of the integrated head 20. The outer wall of the fastening sleeve 23 is provided with a thread. The inner tube 19 passes through the fastening sleeve 23. A mating sleeve 24 is sleeved on the inner tube 19. The mating sleeve 24 is threadedly connected to the fastening sleeve 23. The bottom of the mating sleeve 24 is provided with an inward-facing annular boss. The inner tube 19 and the integrated head 20 are fastened by screwing the fastening sleeve 23 upward.

[0075] An inclined annular circumferential surface is provided at the end of the fastening sleeve 23 near the outer wall of the inner tube 19. An elastic fastener 26 is provided between the fastening sleeve 23 and the mating sleeve 24. An inclined surface parallel to the inclined annular circumferential surface is provided at the position opposite to the fastening sleeve 23. During the fastening process, it is gradually embedded into the inclined annular circumferential surface.

[0076] The bottom of the sleeve 24 is provided with a support platform for supporting the bottom end of the elastic fastener 26. The support platform is the aforementioned annular boss. By twisting and pressing the elastic fastener 26, the inner tube 19 and the integrated head 20 are connected more firmly.

[0077] The integration section also includes a connecting tube 27. The upper end of the connecting tube 27 wraps around the lower end of the integration head 20 and is sleeved with the integration head 20. The lower end is embedded in the outer tube 18. Its outer wall is tightly fitted with the inner wall of the outer tube 18. A channel cavity is formed between the inner wall of the connecting tube 27 and the outer wall of the inner tube 19 for gas return.

[0078] The connecting part includes a connecting sleeve 28. One end of the connecting sleeve 28 wraps around the upper part of the connecting tube 27. That is, the bottom of the connecting sleeve 28 is provided with an inward-facing ring platform. The ring platform supports the upper part of the connecting tube 27. When the other end is connected to the aforementioned sleeve-type connecting seat 1 (the two are threaded together), the connecting tube 27 is pulled closer to the sleeve-type connecting seat 1.

[0079] The connecting part also includes the aforementioned positioning pin, which is located on one side of the integrated head 20 and is used to embed into the positioning hole 14 of the aforementioned 3. The integrated head 20 is cylindrical and coaxially engages with the sleeve-type connecting seat 1, and the built-in tube 17 is connected to the embedded tube. By setting the positioning pin, the integrated head 20 is prevented from rotating relative to the sleeve-type connecting seat 1, so that the through hole 22 (located on the integrated head 20) is aligned with the side hole 13 (located on the elastic seat 11).

[0080] Reference Figure 10 The integrated head 20 has a ring of bosses 29 near its end. The front end of the connecting tube 27 has an enlarged hole that mates with the bosses 29. The outer contour of the enlarged hole contacts and connects with the annular boss at the bottom of the connecting sleeve 28. The connecting sleeve 28 is fitted with the sleeve-type connecting seat 1, and the double sleeve assembly and the diversion structure are tightened by screwing.

[0081] It also includes an outer tube sheath 30, which covers the connection between the outer tube 18 and the connecting tube 27. In the above structure, the connecting tube 27 can be made of a material with a certain degree of elasticity, and its outer wall is connected to the inner wall of the outer tube 18 by adhesive bonding. The outer tube sheath 30 is bonded to the connection between the two, reducing the risk of the connecting tube 27 and the outer tube 18 detaching.

[0082] Example 3:

[0083] like Figure 11 As shown, a two-stage fastening method is used to reliably fasten a high-pressure conduit (i.e., inner tube 19), ensuring the sealing and stability of the high-pressure gas transmission channel during the use of cryosurgery devices. This method combines a two-stage mechanism of elastic compression fastening and threaded mechanical fastening, and is suitable for the connection process of double-tube and split-flow structures. The specific steps are as follows:

[0084] Component preparation: Select the high-pressure inner tube 19 (as the high-pressure pipeline), integrated head 20, elastic fastener 26, fastening sleeve 23, mating sleeve 24, connecting sleeve 28, and sleeve-type base (i.e., sleeve-type connecting seat 1 in the diversion structure). Ensure all component surfaces are clean and undamaged, and that the end of the inner tube 19 is flat for insertion. The insertion hole 21 in the middle of the integrated head 20 is a multi-stage hole for easy subsequent sealing; the end of the fastening sleeve 23 is provided with an inclined annular sectional surface, and the elastic fastener 26 is provided with a corresponding parallel inclined surface.

[0085] Level 1 fastening: Elastic compression connection between inner tube 19 and integrated head 20:

[0086] The inner tube 19 is passed through the fastening sleeve 23 and embedded in the embedding hole 21 of the integrated head 20, ensuring that the end of the inner tube 19 is in close contact with the bottom of the embedding hole 21 to form a preliminary connection.

[0087] An elastic fastener 26 is placed between the fastening sleeve 23 and the mating sleeve 24. The elastic fastener 26 is located near the outer wall of the inner tube 19.

[0088] Tighten the fitting sleeve 24 so that it advances along the thread of the fastening sleeve 23. During the tightening process, the annular boss (support platform) at the bottom of the fitting sleeve 24 pushes the elastic fastener 26 upward, and the inclined surface of the elastic fastener 26 gradually embeds into the inclined annular circumferential surface of the fastening sleeve 23, applying radial extrusion force to the outer wall of the inner tube 19.

[0089] Continue tightening to the preset torque (e.g., controlled at 5-10 Nm using a torque wrench, adjusted according to material strength) to achieve a tightness under elastic deformation, ensuring no gap leakage between the inner tube 19 and the integrated head 20. This stage of tightening utilizes the recoverable deformation of the elastic fastener 26 to provide flexible buffering, adapting to high-pressure gas pulsations and pipeline bending, while providing an elastic seal at the connection of the embedded hole 21 to further enhance airtightness.

[0090] Secondary fastening: Threaded connection to the integrated head 20 to the sleeve-type base:

[0091] Align the integrated head 20, which integrates the inner tube 19 and the outer tube 18, with the sleeve-shaped base (one end of the connecting sleeve 28 wraps around the upper part of the connecting tube 27, and the ring supports the connecting tube 27).

[0092] Insert the positioning pin into the positioning hole 14 of the base to ensure that the integrated head 20 is coaxially aligned with the base and avoid hole position deviation caused by relative rotation.

[0093] Tighten the connecting sleeve 28 to engage with the threaded part of the sleeve-shaped base, and gradually pull the integrated head 20 closer to the base. During the tightening process, the annular boss at the bottom of the connecting sleeve 28 contacts the boss 29 of the integrated head 20 (through the enlarged hole of the connecting tube 27), forming a mechanical lock.

[0094] Continue tightening to the tightening torque (e.g., 10-15 Nm) to achieve a complete tightening. This level of tightening provides rigid support, withstands high pressure (up to several MPa) and external tensile forces, and ensures that the connection does not loosen.

[0095] Verification and Adjustment: After tightening, conduct an airtightness test (e.g., filling with low-pressure gas to detect leaks) and a social verification (e.g., simulating surgical movements to check flexibility). If loosening is found, fine-tune the tightening torque or replace the flexible fastener 26. The entire process can be completed on the assembly table, with operation time controlled within 5-10 minutes.

[0096] The two-stage fastening method described above provides a flexible seal and cushioning through the first stage of elastic compression, while the second stage of threaded fastening ensures mechanical strength. The combination of these two stages makes high-pressure pipeline connections more reliable and durable, suitable for the dynamic operating environments of cryosurgery devices. This method can be proportionally adjusted according to the pipe diameter (e.g., inner tube 19 with a diameter of 2-5 mm), and all connections are threaded, facilitating disassembly and maintenance.

[0097] In this embodiment, the two-stage fastening method is applied to the aforementioned tubing structure. The double-tube system is connected to the diversion structure via this method, enabling the inner tube 19 (high-pressure supply channel) and the outer tube 18 (return channel) to be separated. It is further connected to the level adjustment assembly to support multi-level freezing intensity control. In practical applications, this structure can be integrated into the probe handle, with an overall length controlled to 1-2 m to meet surgical needs.

[0098] Example 4:

[0099] like Figure 12-14 As shown, a portion of the tubing structure of a cryosurgery device includes a shunt structure in Embodiment 1 and a double-tube system in Embodiment 2 that are interconnected, with the connection method referring to Embodiment 3.

[0100] The use of this tubing structure in resurgical cryotherapy devices, such as Figure 15 As shown, it is located at the lower end within the gun-shaped hand-held part 31.

Claims

1. A double-tube diversion structure, comprising a porous base and accessories, wherein the porous base is provided with a double-tube connector and two diversion connectors, the diversion connectors comprising a first diversion connector and a second diversion connector; Its features are, The double-tube connector is provided with a first connecting pipe (2) and a second connecting pipe (7), the first connecting pipe is connected to the first branch seat, and the second connecting pipe (7) is connected to the second branch seat; The first connecting pipe and the second connecting pipe (7) are formed inside the porous base; The double-tube connector includes a sleeve-type connector (1) disposed below the porous base. The sleeve-type connector (1) has a first connecting hole at the center of its bottom, and the first connecting hole extends through and points towards the first diverter. A second connecting hole (5) is opened on one side of the first connecting hole. The second connecting hole (5) is bent and extends through to the second diverter seat in a direction parallel to the first connecting hole.

2. The double-tube flow splitting structure as described in claim 1, characterized in that, The side wall of the porous base is provided with a transition hole (3). The central axis of the transition hole (3) extends beyond the bottom of the sleeve-type connecting seat (1). The wall of the transition hole (3) is not connected to the bottom of the sleeve-type connecting seat (1). The depth of the transition hole (3) ends at a position that does not connect with the first connecting hole. A through hole is provided on the second distributor seat. The through hole is arranged parallel to the first connecting hole and extends to the transition hole (3).

3. The double-tube flow splitting structure as described in claim 2, characterized in that, The sleeve-type connecting seat (1) is provided with an elastic seat (11), the elastic seat (11) has a central hole (12) aligned with the first connecting hole, the elastic seat (11) has a side hole (13) aligned with the second connecting hole (5), and the elastic seat (11) is provided with an installation shaft connected to the multi-hole base. The outer plane of the elastic seat (11) has the side hole (13) and the center hole (12) in sequence, and a positioning hole (14) is provided on one side of the center hole (12).

4. The double-tube flow splitting structure as described in claim 3, characterized in that, It also includes an internal tube (17), which is disposed in the first connecting hole. One end of the internal tube (17) is located in the first diverter seat and is engaged with multiple holes in the diverter seat. The other end extends beyond the outer plane of the elastic seat (11).

5. The double-tube flow splitting structure as described in claim 4, characterized in that, A plug (4) is provided at the opening of the adapter hole (3); Both the first and second diverter seats are provided with connecting sleeves (28).

6. A double-sleeved tube, wherein the double-sleeved tube is provided with an outer tube (18) and an inner tube (19), characterized in that, One end of the double sleeve is provided with a connector for connecting to the diversion structure of claim 5. The connector includes a connecting part and an integrating part. The integrating part is used to integrate the inner tube (19) and the outer tube (18). The connecting part is used to connect the double sleeve to the diversion structure. The integration unit includes: The integrated head (20) includes an embedding hole (21) located in the middle and a through hole (22) located on one side of the embedding hole (21). The embedding hole (21) and the through hole (22) both penetrate the integrated head (20). The embedding hole (21) is used for embedding the built-in tube (17). Connecting tube (27), the upper end of the connecting tube (27) wraps around the lower end of the integrated head (20), and the lower end is embedded in the outer tube (18), the outer wall of which is closely fitted with the inner wall of the outer tube (18); The connecting part includes: A connecting sleeve (28) is provided, one end of which wraps around the upper part of the connecting pipe (27), and the other end is connected to the sleeve-type connecting seat (1) as described in claim 5. A positioning pin, located on one side of the integrated head (20), is used to embed into the positioning hole (14) as described in claim 3.

7. A double-sleeve tube as described in claim 6, characterized in that, The end of the integrated head (20) is provided with a protruding fastening sleeve (23), the inner tube (19) passes through the fastening sleeve (23), and a matching sleeve (24) is sleeved on the inner tube (19), the matching sleeve (24) is connected to the fastening sleeve (23).

8. A double-sleeve tube as described in claim 7, characterized in that, An inclined annular circumferential surface is provided at the end of the fastening sleeve (23) near the outer wall of the inner tube (19). An elastic fastener (26) is provided between the fastening sleeve (23) and the mating sleeve (24). An inclined surface parallel to the inclined annular circumferential surface is provided at the position opposite to the fastening sleeve (23). During the fastening process, it gradually embeds into the inclined annular circumferential surface. The bottom of the fitting sleeve (24) is provided with a support platform for supporting the bottom end of the elastic fastener (26).

9. A double-sleeve tube as described in claim 8, characterized in that, The integrated head (20) has a ring of bosses (29) near its end. The front end of the connecting tube (27) has an enlarged hole that mates with the bosses (29). The outer protruding contour of the enlarged hole contacts and connects with the bottom of the connecting sleeve (28).

10. A double-sleeve tube as described in claim 9, characterized in that, It also includes an outer tube sheath (30), which covers the connection between the outer tube (18) and the connecting tube (27).

11. A two-stage fastening method, characterized in that, The high-pressure pipeline is secured using the fastening sleeve (23) and connecting sleeve (28) as described in claim 10. The high-pressure pipeline is the inner tube (19). The inner tube (19) is embedded in the integrated head (20) and connected to the integrated head (20) by compression fastening with elastic fasteners (26). Then, the integrated head (20) with the integrated high-pressure inner tube (19) is fastened to the sleeve-type base through the connecting sleeve (28). The connection between the connecting sleeve (28) and the fastening sleeve (23) and their mating parts is a threaded connection.

12. A tubing structure for a cryosurgery device, characterized in that, It includes the shunt structure of claim 5 and the double sleeve of claim 10, which are interconnected.

13. The tubing structure of a cryosurgery device as described in claim 12, characterized in that, The double sleeves are connected using the two-stage fastening method described in claim 11.

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