A post-endo-nasal endoscopy conformable lacrimal-nasal stent with a slow-release channel

Abstract

The present application relates to the technical field of lacrimal passage supporting devices, and discloses a post-endoscopic surgery conformable lacrimal sac and nasal cavity stoma support with a slow-release channel. A compliant support frame on the periphery of the drainage tube body is connected and fixed to a root and a channel bearing area through a return connecting arm. A channel seat and a cover form a liquid storage cavity and a return passage separated from the central drainage cavity. The end of the return passage is connected to an outlet distribution seat of a distribution cover. The distribution cover has a normal opening and a supplementary exchange opening. A capture guide frame on the side of the bearing area slidably holds a follower cover. A directional drive frame on the fixed root cooperates with a drive pin and a cover inclined slot to convert the inward movement of the bearing area into the axial movement of the cover, so that the normal long window corresponds to the normal opening, and the supplementary displacement window gradually exposes the supplementary exchange opening. The present application concentrates the channel bearing, cover holding and outlet displacement in the same conformable unit.

Description

Technical Field

[0001] This invention relates to the field of lacrimal duct support device technology, specifically to a conformal dacryocystorhinostomy stent with a slow-release channel after transnasal endoscopy. Background Technology

[0002] After dacryocystorhinostomy, a support device with a through-cavity can be used to maintain drainage space, and positioning points can be set on both sides of the stoma. Chinese Patent Publication No. CN202355481U discloses a multifunctional stent for dacryocystorhinostomy under nasal endoscopy, comprising a tube, a positioning disc, and a retaining strip, with the central hole of the tube serving a drainage function; Chinese Patent Publication No. CN115737229A discloses a drainage stent with a supporting skeleton that expands at both ends. Corresponding structural foundations already exist for tube drainage, end positioning, and stent retraction.

[0003] For stoma stents with separate reservoirs and release pathways on the periphery, partial clearance may alter the cross-section of the flow channel located on the bent thin wall. Even after moving the flow channel to an independent support area, external contact may still reduce the exchange space near the outlet. If a separate movable guard is installed, its guiding, holding, and driving functions may occupy space or restrict the original conformal movement. Therefore, it is necessary to directly coordinate the clearance movement with the outlet guard within the same support unit, preserving one communication opening while exposing another exchange opening with the clearance. Summary of the Invention

[0004] The technical problem that this invention aims to solve is: how to make the flow channel avoid the main bending parts when the outer peripheral bearing area of ​​the stoma stent partially yields, and how to increase the exposed position of the outlet by utilizing this yielding action while maintaining the movable protective piece.

[0005] To address the aforementioned problems, this invention provides a conformal dacryocystorhinostomy stent with a sustained-release channel after transnasal endoscopic surgery. The flexible support frame surrounding the drainage tube consists of a connecting root, a folded-back connecting arm, and a load-bearing backplate. The connecting root is fixed to the drainage tube body. The load-bearing backplate secures the channel seat, and a cover seals the interconnected reservoir cavity and folded-back groove, separating them from the central drainage cavity.

[0006] The end of the return channel connects to the outlet distribution seat, and the distribution cover seals its open distribution cavity. It is provided with a normal passage and a supplementary exchange port leading to the cavity. The load-bearing back plate is fixed to the side of the capture guide frame, which holds the follower guard plate with the capture guide edges on both sides and the end bridge, and allows the guard plate to slide axially.

[0007] The connecting root is fixed with a directional drive frame, and the drive pin extends into the inclined drive groove of the follower guard plate. When the load-bearing back plate moves inward, the drive pin cooperates with the inclined wall to push the guard plate axis to move; its normally open long window continuously corresponds to the normally open port, the supplementary clearance window gradually exposes the supplementary exchange port, and when returning outward, it is brought back along the opposite path.

[0008] Preferably, the limiting platform of the drainage tube body is opposite to the load-bearing back plate, serving as an inward stop before the drive pin reaches the end of the groove. The crossbeam of the directional drive frame passes around the outside of the folding connecting arm axially, and each conformal unit is equipped with corresponding drive, holding, and distribution components.

[0009] Preferably, the channel seat is positioned by the positioning shoulder of the carrying window, and the engaging neck of the outlet distribution seat passes through the side wall relief opening. The cover is fixedly sealed to the sealing edge and the top of the isolation wall, and an overflow relief groove is provided on the outer periphery to separate it from the flow channel. Positioning skirts are provided at both ends of the drainage tube body, with a collection hole on the nasal cavity side and a flap notch on the lacrimal sac side. The beneficial effects of this invention are as follows: This invention connects the fixed root to the channel seat bearing area via a folded-back connecting arm, allowing the main conformal deformation to occur in the connecting arm, while the liquid storage cavity, folded-back groove, and cover plate move with the bearing area. This fit helps reduce the degree to which local clearance directly changes the flow channel cross-section and maintains the respective connectivity between the liquid storage passage and the central drainage cavity.

[0010] An outlet distribution seat, distribution cover, and follow-up guard plate held by a captured guide frame are set in the same load-bearing area. This provides guidance and release restriction for the outlet side guard plate, and also retains a design opening through the overlap of the stroke of the normally open long window and the normally open port. The back limit platform acts as an inward movement stop in the load-bearing area, so that the end of the guard plate drive groove does not have to serve as the main pressure-bearing stop.

[0011] Based on the above structure, the directional drive frame is fixed to the original connection root, and the radial clearance of the bearing area is converted into the axial movement of the guard plate by the drive pin and the oblique drive groove, so that the supplementary clearance window gradually exposes the supplementary exchange port as it moves inward. The same conformal action increases the exposed opening position on the outlet side, and when returning outward, it brings back the guard plate along the same mating path, so there is no need to set up a separate guard plate drive mechanism. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the complete assembly of the present invention.

[0013] Figure 2 A schematic diagram showing the separation of the positioning skirt and circumferential conformal unit relative to the drainage tube body.

[0014] Figure 3 This is a schematic diagram of the split structure of a single conformal unit after omitting the outlet-side linkage components.

[0015] Figure 4 This is a schematic diagram of the overall longitudinal cross-sectional structure of the present invention through the relatively conformal unit.

[0016] Figure 5 This is a schematic diagram showing the liquid storage cavity and return groove after the channel seat and cover plate are separated.

[0017] Figure 6 A schematic diagram showing the structure where the outlet distribution seat, distribution cover, and channel seat are separated on the outlet side.

[0018] Figure 7 This is a schematic diagram of the outlet-side linkage assembly when a single conformal unit is in the outward return position.

[0019] Figure 8 This is a schematic diagram of the outlet-side linkage assembly when a single conformal unit is in the inward position.

[0020] Figure 9 This is a schematic diagram of the structure where the directional drive frame and the follower guard plate are separated.

[0021] Figure 10 A schematic diagram showing the structure of the capture guide frame, follow-up guard plate and outlet distribution assembly separated layer by layer.

[0022] Figure 11 A schematic diagram showing the separation of the positioning skirt, drainage tube body, and flexible support frame.

[0023] Figure 12 A schematic diagram showing the structure for further separation of the follow-up protective plate, the outlet distribution seat, and the distribution cover. Labeling Explanation: 1. Drainage tube body; 2. Nasal cavity side positioning skirt; 3. Lacrimal sac side positioning skirt; 4. Flexible support frame; 5. Channel seat; 6. Cover; 7. Central drainage cavity; 8. Mounting base; 9. Reversible connecting arm; 10. Load-bearing window; 11. Load-bearing backplate; 12. Limiting platform; 13. Liquid reservoir; 14. Reversible groove; 15. Lateral outlet; 16. Recessed opening; 17. Protective edge; 18. Sealing edge; 19. Connecting root; 20. 21. Connecting ring; 22. Recycling hole; 23. Split notch; 24. Positioning shoulder; 25. Glue overflow relief groove; 26. Isolation wall; 27. Directional drive frame; 28. Follow-up guard plate; 29. ​​Capture guide frame; 30. Outlet distribution seat; 31. Angled drive groove; 32. Supplement relief window; 33. Supplement exchange port; 34. Capture guide edge; 35. Drive pin; 36. Normally open long window; 37. Distribution cavity; 38. Normally open port; 39. Distribution cover. Detailed Implementation

[0024] The structure and fitting relationships of the present invention are described below with reference to the accompanying drawings. This embodiment is used for an ostomy between the dacryocystorhinostomy and the nasal cavity. The direction of penetration of the drainage tube body 1 is referred to as the axial direction, the direction away from the central drainage cavity 7 is referred to as the radial outward direction, and the direction around the central drainage cavity 7 is referred to as the circumferential direction. These directions are used to describe the relative relationships between the components and do not limit the actual placement posture of the support.

[0025] like Figure 1 and Figure 2As shown, the wall of the drainage tube 1 is continuously arranged around the central drainage cavity 7, which is open at both ends. Mounting feet 8 and limiting platforms 12 are formed on the outer side of the tube wall. The mounting feet 8 are connected to the compliant support frame 4, and the limiting platforms 12 face the load-bearing back plate 11 of the compliant support frame 4. Both the mounting feet 8 and the limiting platforms 12 extend outward from the tube wall and do not enter the central drainage cavity 7.

[0026] The nasal cavity-side positioning skirt 2 and the lacrimal sac-side positioning skirt 3 are fixed to both ends of the drainage tube body 1, respectively, and the circumferentially distributed conformal units are located between the two positioning skirts. Each unit includes a compliant support frame 4, a channel seat 5, and a cover 6, and is respectively equipped with a directional drive frame 26, a follow-up protective sheet 27, a capture guide frame 28, an outlet distribution seat 29, and a distribution cap 38, with separation space maintained between adjacent units.

[0027] like Figure 3 As shown, the compliant support frame 4 is continuously formed by the connecting root 19, the folded connecting arm 9, and the load-bearing area. The connecting root 19 extends axially, and its inward mounting surface is fixedly engaged with the outer bearing surface of the mounting base 8. The load-bearing back plate 11 is located radially outside the connecting root 19, the channel seat 5 is fixed to the outer side of the load-bearing back plate 11, and the cover plate 6 moves together with the load-bearing area after being sealed with the channel seat 5.

[0028] The reversing connecting arms 9 are located at both axial ends of the load-bearing back plate 11, with each connecting arm arranged on both sides of the connecting root 19. Each reversing connecting arm 9 extends laterally from the root, connecting to the load-bearing back plate 11 via a reversing section and a return section. A deformation space is left between the reversing section and the return section. The main bending and clearance occurs on the continuous arm body. The liquid storage cavity 13 and the reversing groove 14 are located within the channel seat 5 and do not pass through the bending part of the arm body.

[0029] The outer periphery of the load-bearing backplate 11 forms a load-bearing window 10, with a positioning shoulder 23 around the window. The channel seat 5 is inserted into the load-bearing window 10 from the outside, its back end is fixed to the surface of the load-bearing backplate 11, and its periphery is opposite to the positioning shoulder 23. The edge of the cover plate 6 is located inside the load-bearing window 10 and does not extend outward from the outer edge of the compliant support frame 4. The channel seat 5 and the cover plate 6 do not cross the deformation space between the connecting root 19 and the folded connecting arm 9.

[0030] like Figure 5 As shown, the liquid storage cavity 13 is formed on the surface of the channel seat 5 facing the cover plate 6, and the bottom of the cavity retains a solid wall. The return groove 14 extends from the liquid storage cavity 13, and multiple extension groove sections alternately connect at the ends, with the final section extending to the side wall of the channel seat 5 and forming a lateral outlet 15. The liquid storage cavity 13 and the central drainage cavity 7 are separated by the solid wall of the channel seat 5 and the wall of the drainage tube 1, etc., and the two are not the same through cavity.

[0031] The partition wall 25 between adjacent extension slot sections extends from the bottom of the slot to the mating surface of the cover plate 6. The cover plate 6 and the top of the partition wall 25 are fixedly sealed to prevent a lateral shortcut between adjacent slot sections from being formed under the cover plate. The inlet, transition section and end section of the turnaround slot 14 are connected in sequence, and each transition section is a continuous slotted part.

[0032] The sealing edge 18 of the channel seat 5 is arranged around the liquid storage cavity 13 and the return groove 14, and the cover plate 6 is fixedly sealed to the sealing edge 18. The overflow relief groove 24 is located outside the sealing edge 18, separated from the liquid storage cavity 13 and the return groove 14, and provides a relief position for the external bonding medium. The cover plate 6, the bottom of the groove and the side wall of the groove together define the slow release passage, and the lateral outlet 15 remains in communication with the end of the return groove 14.

[0033] The storage cavity 13 contains a medium that can release solutes into the liquid phase. When a continuous liquid phase is formed within the storage cavity 13 and the return channel 14, and the solute concentration within the cavity is higher than that of the liquid phase outside the outlet, the solute diffuses along the return channel 14 towards the lateral outlet 15. When the channel cross-section, diffusion medium, and concentration conditions at both ends are comparable, the return path increases diffusion resistance compared to the direct connection path. This migration is driven by the concentration difference and does not require a continuous reduction in the cavity volume; the release rate still varies with concentration and external exchange conditions.

[0034] like Figure 6 As shown, the recess 16 extends outward from the side wall of the bearing window 10, with protective edges 17 having rounded transition edges on both sides. The engagement neck of the outlet distribution seat 29 passes through the recess 16 and is fixedly sealed around the lateral outlet 15 to the corresponding edges of the side wall of the channel seat 5 and the cover plate 6. The through hole in the engagement neck is directly opposite the lateral outlet 15, and the outer peripheral body is located in the engagement area outside the outlet, with space maintained between its outer wall and the recess 16.

[0035] The support shell of the outlet distribution seat 29 is located on the side of the compliant support frame 4. A distribution cavity 36 is opened on the side of the support shell facing the follower guard plate 27. The distribution cavity 36 communicates with the through hole in the engagement neck. The distribution cover 38 is fixedly sealed to the solid edge of the distribution cavity 36, so that the cavity bottom, cavity sidewall and cover together form a distribution space. The distribution space is connected to the end of the return groove 14, and does not directly cross the return groove 14 to connect to the liquid storage cavity 13.

[0036] The normally open port 37 and the supplementary exchange port 32 on the distribution cap 38 are spaced apart along the axial direction of the drainage tube body 1, both penetrating the distribution cap 38 and leading to the distribution cavity 36. The periphery of the two openings and the space between them remain continuous. The distribution cavity 36 is open to the outside before the cap is assembled. After the cap is fixed, it moves together with the outlet distribution seat 29 and the channel seat 5. Its peripheral joint does not bear the reciprocating sliding of the protective plate.

[0037] like Figure 7 , Figure 8 and Figure 10As shown, the connecting foot of the capture guide frame 28 is fixed to the side of the bearing area of ​​the compliant support frame 4. The frame has two axially extending guide rails and a connecting bridge connecting the two ends of the guide rails. The two guide rails are located on the radial sides of the follower guard plate 27. The frame, the channel seat 5, and the outlet distribution seat 29 move radially together with the load-bearing back plate 11, while the follower guard plate 27 can slide axially relative to the frame.

[0038] The outer sides of the two guide rails form inwardly extending capture guide edges 33. The two side edges of the follower guard plate 27 extend into the capture guide edges 33, with the outer side facing the capture guide edges 33 and the inner side facing the distribution cover 38. The capture guide edges 33 restrict the guard plate from flipping outwards, the guide rails restrict radial offset on opposite sides, and the connecting bridges at both ends are located on the axial release path of the guard plate. The guard plate travels between the two connecting bridges, with its side edges remaining within the capture guide edges 33.

[0039] The follower guard plate 27 is provided with a normally open long window 35 extending axially and a separate supplementary clearance window 31, with a solid blocking section between the two windows. The normally open long window 35 covers the opening range of the normally open port 37 at both the outer return end and the corresponding inner movement end of the guard plate, and continuously overlaps between the two ends. A continuous sheet body is retained around the window to cooperate with the guide rails on both sides.

[0040] exist Figure 7 As shown in the outward return position, the supplementary clearance window 31 is axially offset from the supplementary exchange port 32, and the solid blocking section is located outside the exchange port. When the diaphragm slides towards the nasal cavity, the edge of the supplementary clearance window 31 gradually passes past the supplementary exchange port 32, exposing the outer opening of the latter. A sliding gap is maintained between the diaphragm and the dispensing cap 38, and the solid blocking section changes the blocking relationship facing the opening, without forming a liquid-tight shut-off.

[0041] like Figure 9 As shown, the engaging foot of the directional drive frame 26 is fixed to the outer solid surface of the connecting root 19. The crossbeam passes around the axial outside of the folding connecting arm 9 via the engaging foot, and the side arm is located on the side of the capture guide frame 28. A space is left between the crossbeam and the folding connecting arm 9, and the directional drive frame 26 is not fixed to the load-bearing back plate 11, so that the fixed root and the load-bearing area can still generate relative displacement.

[0042] The drive pin 34 extends from the side arm toward the follower guard plate 27 and enters the inclined drive groove 30, and the drive pin 34 is continuously connected to the side arm. The inclined drive groove 30 penetrates the guard plate and has both radial and axial components in its extension direction. The axis of the drive pin 34 is transverse to the guard plate, and there is a movement gap between its circumferential surface and the opposite groove wall. The pin end does not press against the guard plate, and the outward holding of the guard plate is supported by the capture guide edge 33.

[0043] When the load-bearing backplate 11 moves radially inward, the capture guide frame 28 moves accordingly, while the directional drive frame 26 remains held by the connecting root 19. The drive pin 34 undergoes a radial position change relative to the frame, first eliminating the pin groove movement clearance; after the pin contacts the inclined wall of the inclined drive groove 30, the reaction force has an axial component, pushing the guard plate to slide along the guide rail. The guide rail restricts the guard plate from radially deviating with the pin, thereby converting the inward movement of the load-bearing area into the axial movement of the guard plate.

[0044] Depend on Figure 7 Position towards Figure 8 When the position changes, the normally open long window 35 remains corresponding to the normally open port 37, and the supplementary clearance window 31 gradually overlaps with the supplementary exchange port 32. The distribution cavity 36 thus gains another directly outward opening position, and both openings are still located after the return groove 14. This action changes the exposed relationship on the outlet side, without compressing the liquid storage cavity 13, nor pushing the medium out by reducing the liquid storage space.

[0045] like Figure 11 As shown, the limiting platforms 12 are located in pairs on both sides of the connecting root 19, with their outer end faces facing the inner solid area of ​​the load-bearing back plate 11. In the outward return position, the two are separated, and the load-bearing back plate 11 moves inward and abuts against the limiting platform 12; at this time, the drive pin 34 and the groove end of the inclined drive groove 30 are still separated, and the side edge of the guard plate is still held by the capture guide edge 33. The main stop reaction force is transmitted to the drainage tube body 1 through the load-bearing back plate 11 and the limiting platform 12, and is not replaced by the back stop by the drive groove end.

[0046] When the external force decreases, the reversing connecting arm 9 drives the bearing area to return outward within its elastic deformation range. The drive pin 34 moves in the opposite direction relative to the inclined drive groove 30, cooperating with the groove wall on the other side to make the guard plate return, and the supplementary clearance window 31 gradually withdraws from the overlapping area with the supplementary exchange port 32. Each unit has an independent drive frame and guide frame, and no bridging rod is set between adjacent units, so they can be in different inward positions.

[0047] When assembling the channel unit, first align the side outlet 15 of the channel seat 5 with the relief opening 16, and use the positioning shoulder 23 for circumferential positioning, then fix its back to the load-bearing back plate 11. Before the cover plate 6 is sealed, the liquid storage cavity 13 and the return groove 14 contain the medium through their open surfaces and establish a continuous liquid phase; the cover plate 6 is respectively engaged with the sealing edge 18 and the top of the isolation wall 25, and each groove section remains sequentially connected.

[0048] The engagement neck of the outlet distribution seat 29 is aligned with the lateral outlet 15, and a fixed seal is formed around the neck. Then, the distribution cover 38 engages with the periphery of the distribution cavity 36. The follower guard 27 is inserted from the side of the capture guide frame 28 near the distribution cover 38, with both sides within the capture guide edge 33. The frame connecting feet are then fixed to the load-bearing area. During assembly of the directional drive frame 26, the drive pin 34 is first inserted into the oblique drive groove 30, and then the engagement feet are fixed to the connecting root 19.

[0049] like Figure 11 As shown, the connecting ring 20 of the nasal cavity side positioning skirt 2 is fixed to the end of the drainage tube body 1, and the lacrimal sac side positioning skirt 3 at the other end is fixed by an annular connecting part. The two annular connecting parts respectively cover the corresponding end faces of the connecting root 19 in the radial direction, and the fixed joint does not enter the deformation space of the folded connecting arm 9.

[0050] The lacrimal sac-side positioning skirt 3 has a notch 22 at its outer edge with a rounded bottom. Space is provided between adjacent skirt petals through the notch, and the base of the skirt petals remains continuously connected to the annular connecting part. The retrieval joint of the nasal cavity-side positioning skirt 2 extends continuously outward, with the retrieval hole 21 penetrating the joint. Traction acting on the retrieval joint is transmitted through the connecting ring 20 and the drainage tube body 1 to each fixed connection point. The protective plate is held by the guide frame and moves with the whole structure.

Claims

1. A conformal dacryocystorhinostomy stent with a sustained-release channel after transnasal endoscopic surgery, comprising a drainage tube (1), characterized in that: The flexible support frame (4) on the drainage tube body (1) has a connecting root (19) fixed to the drainage tube body (1) and a load-bearing back plate (11) connected to the root via a folding connecting arm (9); the channel seat (5) fixed to the load-bearing back plate (11) has a folding groove (14) connecting to the outlet distribution seat (29); the distribution cover (38) of the outlet distribution seat (29) is provided with a normal opening (37) and a supplementary exchange port (32); the capture guide frame (28) fixed to the load-bearing back plate (11) slides axially to retain the follower guard plate (27); the directional drive frame (26) fixed to the connecting root (19) uses a drive pin (34) to cooperate with the oblique drive groove (30) of the follower guard plate (27) to convert the inward movement of the load-bearing back plate (11) into the axial movement of the guard plate, so that the normal opening window (35) continuously corresponds to the normal opening (37), and the supplementary clearance window (31) gradually exposes the supplementary exchange port (32).

2. The conformal dacryocystorhinostomy stent with a sustained-release channel after transnasal endoscopic surgery as described in claim 1, characterized in that: The capture guide frame (28) has guide rails on both sides of the follower guard plate (27) and a connecting bridge connecting the axial ends of the two guide rails. The capture guide edge (33) on the guide rail and the outlet distribution seat (29) are located on the two sides of the follower guard plate (27). The side edge of the follower guard plate (27) extends into the inside of the capture guide edge (33). The connecting bridge is located on the axial exit path of the follower guard plate (27). There is a sliding gap between the follower guard plate (27) and the distribution cover (38).

3. A conformal dacryocystorhinostomy stent with a sustained-release channel after transnasal endoscopic surgery, as described in claim 2, is characterized in that: The normal opening (37) and the supplementary exchange opening (32) are spaced apart along the axial direction of the drainage tube body (1). The normal long window (35) extends along the axial direction and overlaps with the normal opening (37) between the two stroke ends of the follower guard plate (27). A solid blocking section is reserved between the supplementary clearance window (31) and the normal long window (35). When the follower guard plate (27) is in the outward return position, the solid blocking section is located outside the supplementary exchange opening (32).

4. A conformal dacryocystorhinostomy stent with a sustained-release channel after transnasal endoscopic surgery, as described in claim 3, is characterized in that: The drainage tube body (1) is provided with a limiting platform (12) opposite to the inner side of the load-bearing back plate (11). When the load-bearing back plate (11) moves inward to abut the limiting platform (12), there is still a gap between the drive pin (34) and the groove end of the inclined drive groove (30). The supplementary clearance window (31) overlaps with the supplementary exchange port (32), and the normally open long window (35) still covers the opening range of the normally open port (37).

5. A conformal dacryocystorhinostomy stent with a sustained-release channel after transnasal endoscopic surgery, as described in claim 1, is characterized in that: The directional drive frame (26) has a connecting foot that is fixedly engaged with the connecting root (19), a crossbeam that passes around the axial outside of the folding connecting arm (9), and a side arm located on the side of the capture guide frame (28). The drive pin (34) is continuously connected to the side arm. The axis of the drive pin (34) is transverse to the sliding direction of the follower guard plate (27), and the extension direction of the oblique drive groove (30) has both radial and axial components.

6. The conformal dacryocystorhinostomy stent with a sustained-release channel after transnasal endoscopic surgery according to claim 1, characterized in that: The opening side of the channel seat (5) is fixedly sealed with a cover plate (6). The compliant support frame (4) has a bearing window (10) for accommodating the channel seat (5) and a relief opening (16) that penetrates the side wall of the bearing window (10). The engagement neck of the outlet distribution seat (29) passes through the relief opening (16) and is fixedly sealed with the outlet side of the channel seat (5) and the cover plate (6). The distribution cavity (36) of the outlet distribution seat (29) communicates with the lateral outlet (15) of the folding groove (14) through the through hole in the engagement neck.

7. A conformal dacryocystorhinostomy stent with a sustained-release channel after transnasal endoscopic surgery, as described in claim 6, is characterized in that: The distribution cavity (36) of the outlet distribution seat (29) is open to the follower guard plate (27), the distribution cover (38) is fixedly sealed to the periphery of the distribution cavity (36), the normal opening (37) and the supplementary exchange opening (32) respectively pass through the distribution cover (38) and lead to the same distribution cavity (36); the connecting foot of the capture guide frame (28) is fixed to the side of the bearing window (10), and the retraction opening (16) retains the guard edge (17) on both sides.

8. A conformal dacryocystorhinostomy stent with a sustained-release channel after transnasal endoscopic surgery, as described in claim 1, is characterized in that: The reversing connecting arm (9) is located at both ends of the load-bearing back plate (11) and distributed on both sides of the connecting root (19). The compliant support frame (4) has a load-bearing window (10) for accommodating the channel seat (5). The periphery of the load-bearing window (10) is provided with a positioning shoulder (23) opposite to the periphery of the channel seat (5). The channel seat (5) has a liquid storage cavity (13) communicating with the reversing groove (14) and a sealing edge (18) surrounding the two. The opening side of the channel seat (5) is provided with a cover (6). The adjacent extension grooves of the reversing groove (14) are separated by the isolation wall (25) and alternately communicate at the ends. The cover (6) is fixedly sealed with the sealing edge (18) and the top of the isolation wall (25). The liquid storage cavity (13) and the reversing groove (14) are separated from the central drainage cavity (7) of the drainage tube body (1).

9. A conformal dacryocystorhinostomy stent with a sustained-release channel after transnasal endoscopic surgery, as described in claim 8, is characterized in that: The channel seat (5) has an overflow relief groove (24) on the outside of the sealing edge (18) that is separated from the liquid storage cavity (13) and the return groove (14); the mounting base (8) on the outer periphery of the drainage tube body (1) is fixedly connected to the connecting root (19); each compliant support frame (4) is distributed at intervals along the circumference of the drainage tube body (1); each compliant support frame (4) is respectively equipped with a channel seat (5), a cover plate (6), a directional drive frame (26), a follow-up protective plate (27), a capture guide frame (28), an outlet distribution seat (29), and a distribution cover (38).

10. A conformal dacryocystorhinostomy stent with a sustained-release channel after transnasal endoscopic surgery, as described in claim 9, characterized in that: The two ends of the drainage tube body (1) are fixedly connected to the nasal cavity side positioning skirt (2) and the lacrimal sac side positioning skirt (3), which are located on both sides of the axial direction of the flexible support frame (4). The connecting ring (20) of the nasal cavity side positioning skirt (2) and the annular connecting part of the lacrimal sac side positioning skirt (3) respectively cover the corresponding end face of the connecting root (19). The nasal cavity side positioning skirt (2) has a continuous retrieval joint with a retrieval hole (21), and the outer edge of the lacrimal sac side positioning skirt (3) has a split notch (22).

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