Flow dividing structure, double casing pipe, fastening method of double casing pipe and pipeline structure

Abstract

The invention belongs to the field of medical instrument research / manufacturing, and particularly relates to a flow dividing structure, a double cannula, a fastening method of the double cannula and a pipeline structure, in particular to the flow dividing structure of the double cannula, the double cannula, the fastening method of the double cannula and a partial pipeline structure of a cryosurgery device. The flow dividing structure comprises a porous base, a sleeve type connecting base and a flow dividing connecting base, independent flow dividing of an inner pipe (high-pressure supply) and an outer pipe (return channel) is achieved through an inner communicating pipe and an adapting hole, and gear adjustment is supported. The double-sleeve design comprises connectors (an integration part and a connecting part), the integration part adopts an integration head, a connecting pipe and an elastic seal, and it is ensured that the inner pipe and the outer pipe are integrated; the connecting portion provides fastening and alignment using a connecting sleeve and a locating pin. The inner pipe is extruded by the elastic fastener to be connected with the integrated head; and the connecting sleeve is screwed to the base through the threads, so that the high-pressure pipeline is reliably fixed. The method is applied to a pipeline structure, and the flexibility is enhanced by combining an outer pipe sheath.

Description

Technical Field

[0001] The present application belongs to the field of medical device research / manufacturing, and specifically relates to a shunt structure, a double sleeve and a fastening method thereof, and a pipeline structure. More specifically, it relates to a double sleeve shunt structure, a double sleeve and a fastening method thereof, and a partial pipeline structure of a cryosurgical device. Background Art

[0002] A cryosurgical device is a medical device that uses cryogenic temperatures to destroy diseased tissue (such as tumors). Its operating principle is based on expansion or evaporative cooling of a refrigerant: a high-pressure refrigerant (such as argon, nitrogen, or carbon dioxide) is delivered from a refrigerant generator to the tip of a probe via a connecting tube, generating a cryogenic effect within the probe. Heat exchange then lowers the probe temperature, allowing precise cryotherapy at the affected area. This device is widely used in areas such as tumor ablation and skin lesion removal, offering advantages such as minimally invasiveness and the absence of radiation.

[0003] In the existing technology, cryosurgical devices often use a double-tube design (coaxial tubes, i.e., an inner tube nested in an outer tube) to connect the refrigerant generator. Compared with two independent tubes (separate supply and return lines), it has several advantages: (1) more uniform cooling distribution, avoiding localized cooling unevenness; (2) higher heat transfer efficiency, enhancing heat exchange through turbulence; (3) compact structure, easy integration into the probe, reducing heat loss; (4) better safety and reliability, reducing the risk of leakage. These advantages make the double-tube design the mainstream choice, in which the inner tube is responsible for transporting high-pressure refrigerant, and the outer tube forms the return channel and is thermally connected to the probe housing 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 pipelines to be affected. Existing connections are often weak and prone to loosening or breaking. This is especially true for the inner tube, which carries high-pressure refrigerant (pressure can reach several MPa), requiring extremely high connection strength. Second, the pipelines need to have a certain degree of ductility and flexibility to adapt to surgical movements, but traditional rigid connections (such as simple welding or snap-fitting) cannot meet this requirement and are prone to bending fatigue or seal failure. Third, to achieve gear adjustment (control of freezing intensity), the device requires internal pipeline diversion, but the lack of a supporting diversion structure makes the diversion complex and inefficient, and may even cause gas cross-flow or pressure instability. These issues 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 double-tube shunt structure and supporting connection solution to solve the above technical problems and improve the overall performance of the cryosurgical device. Summary of the Invention

[0006] In order to solve the above technical problems, this application provides a new technical solution, which is as follows:

[0007] A double-sleeve diversion structure includes a porous base and accessories. The porous base is provided with a double-sleeve connecting seat and two diversion connecting seats. The diversion connecting seats include a first diversion seat and a second diversion seat.

[0008] A first connecting pipe and a second connecting pipe are respectively provided at the double-tube connecting seat, the first connecting pipe is connected to the first diverter seat, and the second connecting pipe is connected to the second diverter seat;

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

[0010] The double-sleeve connecting seat includes a sleeve-type connecting seat arranged below the porous base, a first connecting hole is provided at the center of the bottom of the sleeve-type connecting seat, and the first connecting hole is directed through to the first diverter seat;

[0011] A second connecting hole is opened on one side of the first connecting hole, and the second connecting hole is bent and connected to the second diverter seat in a direction parallel to the first connecting hole. The sleeve-type connecting seat is convenient for connecting the double sleeve and the sleeve, and can be fastened by threaded connection or locking when necessary.

[0012] The double sleeves are connected to the sleeve-type connecting seat, the inner tube is connected to the first diversion seat through the first connecting pipe, and the outer tube is connected to the second diversion pipe through the second connecting pipe, realizing the diversion of the double sleeves, and then connected to the gear adjustment assembly through the pipeline.

[0013] Furthermore, a transfer hole is provided on the side wall of the porous base, the central axis of the transfer hole passes over the bottom of the sleeve-type connecting seat, and the wall of the transfer hole is not connected to the bottom of the sleeve-type connecting seat, so that when the second connecting hole is provided, it can pass through to the transfer hole. The hole depth of the transfer hole ends at a position where it does not pass through the first connecting hole, and there is a certain distance, so that the second connecting hole composed of the transfer hole as an intermediate structure does not intersect with the first connecting hole, thereby realizing the diversion of the first connecting pipe and the second connecting pipe;

[0014] A through hole is provided on the second diverter seat, which is arranged parallel to the first connecting hole and is connected to the adapter hole. The starting part of the second connecting hole is also connected to the adapter hole. The through hole, the middle part of the adapter hole and the second connecting hole together constitute the second connecting pipe.

[0015] Furthermore, an elastic seat is provided in the sleeve-type connecting seat, the elastic seat has a central hole aligned with the first connecting hole, the elastic seat has a side hole aligned with the second connecting hole, a mounting shaft is provided on the elastic seat to be connected to the porous 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 expanded, and the mounting shaft is a connecting screw that passes through the positioning hole and is connected 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, thereby realizing multiple uses of one hole;

[0016] The outer surface of the elastic seat is provided with side holes, center hole and positioning hole in sequence. The elastic seat can play a certain sealing role when connecting pipelines and effectively prevent the double-pipe gas flow.

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

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

[0019] The first diverter seat and the second diverter seat are both provided with a connecting sleeve, which facilitates the connection of the pipeline to the gear adjustment component.

[0020] The present application also provides a double-tube, which is provided with a nested outer tube and an inner tube, and a connector connected to the aforementioned diversion structure is provided at one end of the double-tube, the connector including a connecting portion and an integrating portion, the integrating portion being used to integrate the inner tube and the outer tube, and the connecting portion being used to connect the double-tube to the diversion structure;

[0021] The integration department includes:

[0022] The integrated head includes an embedding hole in the middle and a conducting hole on one side of the embedding hole. Both the embedding hole and the conducting hole pass through the integrated head. The embedding hole is used to embed the built-in tube. The embedding hole is a multi-step (multi-segment) hole. An elastic seal is set at the connection between the end of the built-in 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. The lower end of the connecting tube is embedded in the outer tube. The outer wall of the connecting tube fits tightly with the inner wall of the outer tube, and a channel cavity is formed between the inner wall of the connecting tube and the outer wall of the inner tube for gas reflux.

[0024] The connection part includes:

[0025] Connecting sleeve, one end of the connecting sleeve wraps around the upper part of the connecting pipe, that is, a circle of inward-facing ring platform is set at the bottom of the connecting sleeve, and the ring platform supports the upper part of the connecting pipe. When the other end is connected to the aforementioned sleeve-type connecting seat, the connecting pipe is pulled closer to the sleeve-type connecting seat;

[0026] The positioning pin, located on one side of the integrated head, is used to engage the positioning hole mentioned in step 3. The integrated head is cylindrical and mates coaxially with the sleeve-type connector. The built-in tube is connected and embedded in the tube. The positioning pin prevents the integrated head from rotating relative to the sleeve-type connector, ensuring that the guide hole (located on the integrated head) and the side hole (located on the elastic seat) are aligned.

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

[0028] Furthermore, an inclined annular section is provided at the end of the fastening sleeve near the outer wall of the inner tube, an elastic fastener is provided between the fastening sleeve and the matching sleeve, and an inclined surface parallel to the inclined annular section is provided at the position opposite to the fastening sleeve, and gradually embedded in the inclined annular section during the fastening process;

[0029] A support platform for supporting the bottom end of the elastic fastener is provided at the bottom of the matching sleeve. The support platform is the aforementioned annular boss. The connection between the inner tube and the integrated head is tightened by screwing and squeezing the elastic fastener.

[0030] Furthermore, the integrated head has a circle of bosses near the end, and the front end of the connecting tube is provided with an expanded hole that matches the bosses. The outer protrusion of the expanded hole contacts and connects with the annular boss at the bottom of the connecting sleeve. The connecting sleeve is connected to the sleeve-type connector, and the double sleeve is tightened to form the entire diversion structure.

[0031] Furthermore, the outer tube sheath is included, which 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 bonding. The outer tube sheath is bonded to the connection between the two, thereby reducing the risk of the connecting tube and the outer tube being separated.

[0032] The present application also provides a secondary fastening method, comprising fastening a high-pressure pipeline using a fastening sleeve and a connecting sleeve,

[0033] The high-pressure pipeline is an inner tube, which is embedded in the integrated head and connected to the integrated head by means of extrusion and fastening with elastic fasteners. The integrated head with the high-pressure inner tube is then fastened to the sleeve-type base through a connecting sleeve.

[0034] The connection between the connecting sleeve and the fastening sleeve and its matching piece is all threaded. Through the above-mentioned two-stage fastening connection method, the high-pressure pipeline connection is made more reliable.

[0035] The present application also provides a partial (“partial” means that these pipelines are only a part of all pipelines of the cryosurgical device) pipeline structure of a cryosurgical device, comprising the aforementioned flow-dividing structure and the double sleeve 10 .

[0036] Furthermore, the double sleeves in the pipeline structure apply the aforementioned secondary fastening method.

[0037] The beneficial effects of this application are:

[0038] The technical solutions provided in this application (double-tube flow diversion structure, double-tube design, two-stage fastening method, and partial piping structures applied to cryosurgical devices) primarily address the shortcomings of existing technologies, such as insufficient connection strength, poor flexibility, weak sealing, and inconvenient flow diversion, to achieve a more reliable, efficient, and safe cryosurgical device piping system. Specifically:

[0039] 1. Through the double-sleeve connector and the shunt connector (first shunt connector and second shunt connector) on the porous base, the inner tube and outer tube are respectively connected to independent channels, making it easy to connect the double-sleeve shunt to the gear adjustment component, supporting multi-gear freezing intensity adjustment, and improving the operational flexibility and treatment accuracy of the device.

[0040] 2. The use of sleeve-type connectors, threaded or lock fastening methods, and a secondary fastening method (first using elastic fasteners to squeeze the inner tube to connect to the integrated head, and then fastening it to the base through the connecting sleeve) are particularly suitable for high-pressure gas inner tubes, ensuring that the connection can withstand high pressure without loosening, 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 tube) gives the pipeline a certain degree of ductility and flexibility, adapting to various movements of the cryosurgical device during surgery (such as pulling and bending), avoiding damage or inconvenience caused by rigid connection. At the same time, the outer tube sheath further strengthens the stability of the connection and reduces the risk of detachment.

[0042] 4. The elastic seat provides a seal to prevent gas cross-flow; the elastic seal in the integrated part forms a closed gas path; the positioning pin ensures hole alignment 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 design of the through-pipes inside the porous base (such as the first connecting pipe, the second connecting pipe, the adapter hole, etc.) simplifies the assembly process, and one hole can be used for multiple purposes (the positioning hole can be used for both screw installation and positioning pin insertion), reducing manufacturing complexity; the built-in pipe extension part is convenient for docking, and the connecting sleeve facilitates pipeline expansion, which reduces the number of external connectors as a whole and improves the portability and maintenance efficiency of the device.

[0044] 6. Reduce the risk of accidental injury during surgery (such as tissue frostbite caused by refrigerant leakage) through reliable diversion and fastening; suitable for partial piping of cryosurgical devices, compatible with existing systems, potentially reducing production costs and energy consumption, while extending the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 This is a schematic front view of a porous base according to the first embodiment of the present application;

[0046] Figure 2 This is a left side schematic diagram of the porous base of Example 1 of the present application;

[0047] Figure 3 for Figure 2 EE-direction cross-sectional view;

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

[0049] Figure 5 This is an overall three-dimensional schematic diagram of Example 1 of the present application;

[0050] Figure 6 This is a cross-sectional schematic diagram of Example 1 of the present application;

[0051] Figure 7 This is a schematic diagram of the elastic seat of Example 1 of the present application;

[0052] Figure 8 This is an overall schematic diagram of Example 2 of the present application;

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

[0054] Figure 10 This is a schematic diagram of an integrated head according to the second embodiment of the present application;

[0055] Figure 11 This is a schematic diagram of Example 3 of the present application;

[0056] Figure 12 This is a schematic diagram of the main view of the fourth embodiment of the present application;

[0057] Figure 13 This is a three-dimensional schematic diagram of the fourth embodiment of the present application;

[0058] Figure 14 This is a schematic diagram of the internal structure of the fourth embodiment of the present application;

[0059] Figure 15 This is a schematic diagram of the installation position of the fourth embodiment of the present application in the cryosurgery device.

[0060] In the figure: 1. Sleeve-type connecting seat; 2. First connecting pipe; 3. Adapter hole; 4. Plug; 5. Second connecting hole; 6. Second-order hole; 7. Second connecting pipe; 8. Mounting hole; 9. Air inlet connecting tube; 10. Air 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. Outer tube; 19. Inner tube; 20. Integrated head; 21. Embedded hole; 22. Through hole; 23. Fastening sleeve; 24. Matching 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 DESCRIPTION

[0061] Example 1:

[0062] like Figure 1-7 As shown, a double-tube diversion structure includes a porous base, the shape of the porous base is as shown in FIG. Figure 1 、 2 As shown in FIG4 , the upper portion is a multifaceted solid with parallel inner and outer surfaces, the left side of the lower portion bulges downward, and the bulge extends downward to form a cylinder, and a thread line is provided on the outer wall of the cylinder.

[0063] Reference Figure 3 A blind hole is opened upward along the center of the cylinder to form a sleeve-type connecting seat 1, i.e., a double-sleeve connecting seat. A third-step hole is opened opposite the blind hole. The first-step fine hole passes through to the top surface of the sleeve-type connecting seat 1. The third-step hole serves as the first connecting pipe 22.

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

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

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

[0067] like Figure 5As shown, an air inlet connection tube 9 is provided outside the first connecting tube 22, and an air outlet connection tube 10 is provided outside the second connecting tube 27; Figure 6 The red hatched portion is the elastic seat 11. The elastic seat 11 opens a center hole 12 aligned with the first connecting hole. The elastic seat 11 opens a side hole 13 aligned with the second connecting hole 5. The elastic seat 11 is provided with a mounting shaft connected to the porous 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 is coaxially connected to the positioning hole 14. The inner diameter of the front end portion of the positioning hole 14 is expanded. The mounting shaft is a connecting screw 15 that passes through the positioning hole 14 and is connected to the mounting hole 8. That is, the positioning hole 14 can be used to install the connecting screw 15, and it can also facilitate the insertion of the positioning pin shaft 16 on the double sleeve, realizing multiple uses of one hole.

[0068] Reference Figure 7 On the outer plane of the elastic seat 11 are sequentially a side hole 13, a center hole 12, and a positioning hole 14. The elastic seat 11 can play a certain sealing role when connecting the pipe 27 and effectively prevent the double-pipe gas flow.

[0069] The inner tube 17 is disposed in the first connecting hole, one end of which is located in the first diverter seat and is engaged with the multi-section holes in the diverter seat, while the other end extends beyond the outer plane of the elastic seat 11. The extended portion serves as a connecting portion to connect with the inner tube 19 of the double-tube.

[0070] Example 2:

[0071] like Figure 8-10 As shown, a double sleeve, referring to Figure 8 A positioning pin 16 is provided on the top thereof and is installed corresponding to the positioning hole 14 in the first embodiment.

[0072] The connection structure of the upper part of the double casing is as follows Figure 9 As shown, the double-tube is provided with a nested outer tube 18 and inner tube 19, and one end of the double-tube is provided with a connector connected to the aforementioned diversion structure. The connector includes a connecting portion and an integrating portion. The integrating portion is used to integrate the inner tube 19 and the outer tube 18, and the connecting portion is used to connect the double-tube 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 conductive hole 22 located on one side of the embedding hole 21. The embedding hole 21 and the conductive hole 22 both pass through the integrated head 20. The embedding hole 21 is used to embed the built-in tube 17. The embedding hole 21 is a multi-step (multi-section) hole. An elastic seal is set at the connection between the end of the built-in tube 17 and the embedding hole 21, which plays a sealing role after embedding; the conductive hole 22 is connected to the side hole 13.

[0074] A protruding fastening sleeve 23 is provided at the center position of the end of the integrated head 20, and a threaded line is provided on the outer wall of the fastening sleeve 23. The inner tube 19 passes through the fastening sleeve 23. A matching sleeve 24 is sleeved on the inner tube 19. The matching sleeve 24 is threadedly connected to the fastening sleeve 23. An inward annular boss is provided at the bottom of the matching sleeve 24. The inner tube 19 and the integrated head 20 are fastened upward by screwing on the fastening sleeve 23.

[0075] An inclined annular section 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 matching sleeve 24. An inclined surface parallel to the inclined annular section is provided at the position opposite to the fastening sleeve 23, and the elastic fastener 26 gradually embeds into the inclined annular section during the fastening process.

[0076] The bottom of the matching 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 screwing and squeezing the elastic fastener 26, the connection between the inner tube 19 and the integrated head 20 is tightened.

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

[0078] The connection portion includes a connecting sleeve 28, one end of which wraps around the upper portion of the connecting pipe 27. That is, a ring is provided at the bottom of the connecting sleeve 28 facing inwards, which supports the upper portion of the connecting pipe 27. When the other end is connected to the aforementioned sleeve-type connecting seat 1 (the two are threadedly connected), the connecting pipe 27 is pulled closer to the sleeve-type connecting seat 1.

[0079] The connection also includes the aforementioned locating pin, located on one side of the integrated head 20 and adapted to engage with the aforementioned locating hole 14. The integrated head 20 is cylindrical and coaxially mates with the sleeve-type connector 1, with the internal tube 17 connected and embedded within the tube. The provision of the locating pin prevents the integrated head 20 from rotating relative to the sleeve-type connector 1, aligning the through hole 22 (located on the integrated head 20) with the side hole 13 (located on the elastic seat 11).

[0080] Reference Figure 10 The integrated head 20 is provided with a circle of bosses 29 near the end. The front end of the connecting tube 27 is provided with an expanded hole that matches the bosses 29. The outer protruding contour of the expanded hole contacts and connects with the annular boss at the bottom of the connecting sleeve 28. The connecting sleeve 28 is connected to the sleeve-type connecting seat 1 by screwing and tightening the double-sleeve overall and the diversion structure.

[0081] The outer tube sheath 30 is also included, and the outer tube sheath 30 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 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 being separated.

[0082] Example 3:

[0083] like Figure 11 A two-stage fastening method is shown, which is used to reliably fasten the high-pressure pipeline (i.e., inner tube 19) to ensure the sealing and stability of the high-pressure gas transmission channel during use of the cryosurgical device. This method combines the two-stage mechanism of elastic extrusion fastening and threaded mechanical fastening and is suitable for the connection process of double cannula and diversion structure. The specific steps are as follows:

[0084] Prepare the components: Select the high-pressure inner tube 19 (serving as the high-pressure pipeline), integrated head 20, elastic fastener 26, fastening sleeve 23, mating sleeve 24, connecting sleeve 28, and the sleeve-type base (i.e., the sleeve-type connector 1 in the diversion structure). Ensure that all component surfaces are clean and undamaged, and that the end of the inner tube 19 is flat for easy insertion. The insertion hole 21 in the center of the integrated head 20 is a multi-step hole to facilitate subsequent sealing. The end of the fastening sleeve 23 is designed with an inclined annular section, and the elastic fastener 26 has a corresponding parallel inclined surface.

[0085] First-level fastening: elastic extrusion connects the inner tube 19 and the integrated head 20:

[0086] The inner tube 19 is passed through the fastening sleeve 23 and embedded into 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 matching sleeve 24 , and the elastic fastener 26 is located near the outer wall of the inner tube 19 .

[0088] The mating sleeve 24 is screwed in, advancing along the threads of the fastening sleeve 23. During the screwing process, the annular boss (support platform) at the bottom of the mating sleeve 24 pushes the elastic fastener 26 upward, and the inclined surface of the elastic fastener 26 gradually embeds into the inclined annular section of the fastening sleeve 23, exerting radial extrusion force on the outer wall of the inner tube 19.

[0089] Continue tightening to a preset torque (e.g., 5-10 Nm using a torque wrench, adjusted based on material strength) to achieve elastic tightening, ensuring leak-free clearance between inner tube 19 and integrated head 20. This level of tightening utilizes the recoverable deformation of elastic fastener 26 to provide a flexible buffer to accommodate high-pressure gas pulsation and pipeline bending. Furthermore, an elastic seal is provided at the connection of embedded hole 21 to further enhance airtightness.

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

[0091] Align the integrated head 20 integrated with the inner tube 19 and the outer tube 18 with the sleeve-type base (one end of the connecting sleeve 28 wraps around the upper part of the connecting tube 27, and the ring platform 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 to avoid hole position deviation caused by relative rotation.

[0093] Tighten the connecting sleeve 28 until it engages the threads of the sleeve-type base, gradually pulling 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 expansion hole of the connecting tube 27), forming a mechanical lock.

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

[0095] Verification and Adjustment: After tightening, perform an airtightness test (e.g., injecting low-pressure gas to detect leaks) and a physical verification (e.g., simulating surgical movements to check flexibility). If looseness is detected, fine-tune the tightening torque or replace the elastic fastener. 26 The entire process can be completed on the assembly table, taking 5-10 minutes.

[0096] This two-stage fastening method combines the first-stage elastic extrusion, which provides a flexible seal and cushioning, with the second-stage threaded fastening, which ensures mechanical strength. This combination makes high-pressure pipe connections more reliable and durable, suitable for the dynamic operating environments of cryosurgical devices. This method can be scaled to suit pipe diameter (for example, an inner pipe 19 with a diameter of 2-5 mm), and all connections are threaded, facilitating disassembly and maintenance.

[0097] In this embodiment, this two-stage fastening method is applied to the aforementioned piping structure. This method connects the dual-tube structure to a diversion mechanism, separating the inner tube 19 (high-pressure supply channel) from the outer tube 18 (return channel). This structure is further connected to a gear adjustment assembly, supporting multi-level freezing intensity control. In practical applications, this structure can be integrated into a probe handle, with an overall length of 1-2 meters to meet surgical requirements.

[0098] Example 4:

[0099] like Figure 12-14 As shown, a partial piping structure of a cryosurgical device includes the diverter structure in the first embodiment and the double sleeve in the second embodiment connected to each other. The connection method is similar to that in the third embodiment.

[0100] The use of the pipeline structure in a surgical freezing device is as follows Figure 15 As shown, it is located at the lower end of the gun-shaped hand-held part 31.

Claims

1. A double-tube flow diversion structure, comprising a porous base and accessories, wherein the porous base is provided with a double-tube connection seat and two flow diversion connection seats, wherein the flow diversion connection seats include a first flow diversion seat and a second flow diversion seat; It is characterized in that A first connecting pipe (2) and a second connecting pipe (7) are respectively provided at the double-tube connecting seat, wherein the first connecting pipe is connected to the first diverter seat, and the second connecting pipe (7) is connected to the second diverter seat; The first connecting pipe and the second connecting pipe (7) are opened inside the porous base; The double-tube connection seat comprises a sleeve-type connection seat (1) arranged below the porous base, a first connecting hole is provided at the bottom center of the sleeve-type connection seat (1), and the first connecting hole is directed through to the first diverter seat; A second connecting hole (5) is provided on one side of the first connecting hole, and the second connecting hole (5) is bent and connected to the second shunt seat in a direction parallel to the first connecting hole.

2. A double-tube flow diversion structure according to claim 1, characterized in that: A transfer hole (3) is provided on the side wall of the porous base, the center axis of the transfer hole (3) passes over the bottom of the sleeve-type connecting seat (1), and the wall of the transfer hole (3) is not connected to the bottom of the sleeve-type connecting seat (1), and the depth of the transfer hole (3) stops at a position that does not penetrate the first connecting hole; A through hole is provided on the second diverter seat, the through hole is arranged in parallel with the first connecting hole, and the through hole is connected to the transfer hole (3).

3. A double-tube flow diversion structure according to claim 2, characterized in that: An elastic seat (11) is provided in the sleeve-type connecting seat (1), 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 a mounting shaft is provided on the elastic seat (11) to connect with the porous base; The side hole (13) and the center hole (12) are arranged on the outer plane of the elastic seat (11) in sequence, and a positioning hole (14) is provided on one side of the center hole (12).

4. A double-tube flow diversion structure according to claim 3, characterized in that: It also includes an internal tube (17), which is arranged in the first connecting hole. One end of the internal tube (17) is located in the first diverter seat and is clamped to the multi-section holes in the diverter seat, and the other end extends beyond the outer plane of the elastic seat (11).

5. A double-tube flow diversion structure according to any one of claims 2 to 4, characterized in that: A plug (4) is provided at the opening of the adapter hole (3); The first diverter seat and the second diverter seat are both provided with a connecting sleeve (28).

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

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

8. A double sleeve as claimed in claim 7, characterized in that: An inclined annular section 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 matching sleeve (24), and an inclined surface parallel to the inclined annular section is provided at the position opposite to the fastening sleeve (23), and gradually embedded in the inclined annular section during the fastening process; The bottom of the matching sleeve (24) is provided with a support platform for supporting the bottom end of the elastic fastener (26).

9. A double sleeve as claimed in claim 8, characterized in that: The integrated head (20) is provided with a circle of bosses (29) near the end thereof, and the front end of the connecting tube (27) is provided with an expanded hole that matches the bosses (29), and the outer protruding contour of the expanded hole contacts and connects with the bottom of the connecting sleeve (28).

10. A double sleeve according to any one of claims 9, characterized in that: It also includes an outer tube sheath (30), which wraps the connection between the outer tube (18) and the connecting tube (27).

11. A secondary fastening method, characterized in that: The high-pressure pipeline is fastened using the fastening sleeve (23) and the connecting sleeve (28) according to claim 10. The high-pressure pipeline is the inner tube (19), and the inner tube (19) is embedded in the integrated head (20) and connected to the integrated head (20) by means of extrusion and fastening by means of elastic fasteners (26), and then the integrated head (20) integrated with the high-pressure inner tube (19) is fastened to the sleeve-type base via a connecting sleeve (28); The connection between the connecting sleeve (28), the fastening sleeve (23) and its matching piece is all threaded connection.

12. A pipeline structure of a cryosurgical device, characterized in that: The invention comprises the diversion structure according to claim 5 and the double sleeve according to claim 10 which are connected to each other.

13. The pipeline structure of a cryosurgical device according to claim 12, characterized in that: The double sleeves are connected using the secondary fastening method of claim 11.

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