Biliary drainage stent for ercp procedures

Abstract

This invention discloses a gallbladder drainage stent for ERCP surgery, comprising an insertion tube, several sets of connecting ribs fixedly connected to the outside of the insertion tube, a communicating groove opened on the outside of the connecting ribs, several sets of rotating plates rotatably connected inside the communicating groove, a rotating block rotatably connected to the inner side of the outer end of the rotating plate, a support plate fixedly connected to the outside of the rotating block in the same group, sliding rods slidably connected to the inside of both sides of the support plate, contact plates fixedly connected to the outside of the sliding rods, several sets of connecting tubes fixedly connected between the contact plates, a through tube fixedly connected between the middle of the connecting tube and the inside of the insertion tube, and a fluid inlet opened on the outside of the connecting tube. The entire stent can be deployed and anchored with only one action, making the operation simple and quick, significantly shortening the operation time, reducing surgical risks and patient suffering.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a gallbladder drainage stent for ERCP surgery. Background Technology

[0002] Endoscopic retrograde cholangiopancreatography (ERCP) is currently the preferred minimally invasive method for treating biliary obstruction. A drainage stent is placed into the bile duct through a duodenoscope to relieve the obstruction, drain bile, and alleviate jaundice and infection symptoms. The gallbladder drainage stent is the core instrument in ERCP surgery, and its performance directly determines the surgical outcome and patient prognosis.

[0003] Existing gallbladder drainage stents have several clinical shortcomings: fixed stent length and diameter fail to adapt to individual differences in biliary anatomy among patients, easily leading to stents that are too long or too short, too loose or too tight; anchoring structures are mostly fixed barbs or enlarged ends, unable to dynamically match the contraction and relaxation of the bile duct, easily causing stent displacement or excessive pressure on the mucosa, resulting in complications such as ulceration, bleeding, and perforation; the drainage channel is singular, easily blocked by biliary sludge and deposits, leading to drainage failure; and the support force cannot be adjusted after stent implantation, easily causing secondary damage to inflamed and edematous bile ducts. Therefore, developing an ERCP gallbladder drainage stent with personalized adjustable length, adaptive expansion anchoring, dynamic matching of physiological movement, and anti-blockage drainage is of significant clinical importance for improving surgical success rates, reducing complications, and improving patient prognosis. Summary of the Invention

[0004] The purpose of this invention is to provide a gallbladder drainage stent for ERCP surgery to solve the problems mentioned in the background art.

[0005] To achieve the aforementioned objective, the present invention provides the following technical solution: a gallbladder drainage stent for ERCP surgery, comprising an insertion tube, wherein a plurality of connecting ribs are fixedly connected to the outside of the insertion tube, a communicating groove is provided on the outside of the connecting ribs, a plurality of rotating plates are rotatably connected inside the communicating groove, a rotating block is rotatably connected to the inner side of the outer end of the rotating plate, a support plate is fixedly connected to the outside of the rotating block in the same group, sliding rods are slidably connected to the inside of both sides of the support plate, a contact plate is fixedly connected to the outside of the sliding rods, a plurality of connecting tubes are fixedly connected between the contact plates, a through tube is fixedly connected between the middle of the connecting tube and the inside of the insertion tube, and a liquid inlet is provided on the outside of the connecting tube.

[0006] Preferably, the connecting rib has a sliding groove communicating with the connecting slot. Several sets of sliding plates are slidably connected inside the sliding groove. The sliding plates are movably connected front and rear. A toothed ring is fixedly connected to the outer side of the inner end of the rotating plate. A toothed rack is meshed with the outer side of the toothed ring. The toothed rack is fixedly connected to the sliding plate. A sliding ring is fixedly connected to one end of the insertion tube. A limiting platform is fixedly connected to the other end of the sliding ring. A collar is slidably connected to the outer side of the sliding ring. A connecting rope is fixedly connected between one end of the sliding plate and the collar. The connecting rope is slidably connected to the inside of the side wall of the connecting rib.

[0007] Preferably, a connecting rod is fixedly connected to one end of the sliding plate, a connecting ball is fixedly connected to the other end of the connecting rod, and a spherical groove is formed inside the other end of the sliding plate, with the connecting ball rotatably connected inside the spherical groove.

[0008] Preferably, a first spring is fixedly connected between both ends of the contact plate and the support plate, the first spring is sleeved on the outside of the sliding rod, and a first limiting piece is fixedly connected to the other end of the sliding rod.

[0009] Preferably, the through pipe has corrugated pipes integrally formed inside and on both sides of the connecting pipe.

[0010] Preferably, a connecting frame is fixedly connected to one end of the sliding plate on one side, and a guide rod is slidably connected inside the connecting frame. One end of the guide rod is fixedly connected to the inner wall of the sliding groove, and a second limiting piece is fixedly connected to the other end of the guide rod. A second spring is fixedly connected between the second limiting piece and the connecting frame, and the second spring is sleeved on the outside of the guide rod.

[0011] Preferably, the outer side of the sliding ring is provided with several sets of limiting grooves, and the inside of the collar is fixedly connected to a limiting block, which is slidably connected to the inside of the limiting groove.

[0012] Preferably, the collar has several sets of connecting holes inside, the connecting holes and connecting ribs are staggered, the outermost sliding ring has a threaded line, the outer side of the threaded line is threaded with a rotating gear, the rotating gear is rotatably connected to the collar, and the outer side of the insertion tube has several sets of guide rings directly opposite the connecting holes.

[0013] Preferably, one end of the sliding ring is fixedly connected to several sets of connecting pieces facing the connecting ribs, and the other end of the insertion tube is provided with a connecting groove for matching the connecting pieces.

[0014] Preferably, a liquid guide tube is sleeved inside the insertion tube, and several sets of support pads are fixedly connected to the outside of the liquid guide tube. The support pads are in close contact with the inner wall of the insertion tube, and several sets of connecting holes are opened on the outside of the liquid guide tube.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention rotates a toothed disc; a threaded drive drives the collar to move axially along the sliding ring; a connecting rope pulls all the sliding plates to move synchronously along the sliding groove; a rack drives the toothed ring to rotate, causing the rotating plate to unfold outward, pushing the support plate and contact plate to move radially; a single toothed disc synchronously drives multiple collar segments, and the entire support can be unfolded and anchored with just one action. The operation is simple and quick, greatly shortening the operation time and reducing the surgical risk and patient suffering. 2. This invention uses a modular splicing structure to connect a corresponding number of insertion tubes to the required length by means of connecting pieces and connecting grooves, based on the bile duct length measured by preoperative imaging examination. The length of the stent can be freely combined according to the length of the patient's bile duct, eliminating the need to prepare multiple specifications. The adaptive expansion structure can be adapted to bile ducts of different diameters, making it suitable for patients from children to adults, greatly expanding its applicability. 3. This invention achieves anchoring by having a contact plate adaptively conform to the bile duct wall under the action of a first spring; a second spring constantly tensions the connecting rope to ensure gapless transmission; a spherical hinged sliding plate ensures continuous transmission when the stent bends; and the spring contact plate adapts to the contraction and relaxation of the bile duct, maintaining a stable anchoring force, preventing displacement and detachment, and avoiding excessive pressure on the mucosa; effectively reducing the incidence of complications such as stent displacement, mucosal ulceration, bleeding, and perforation, and improving long-term safety. 4. This invention allows bile from the bile duct to enter the connecting tube through the inlet, flow into the insertion tube through the through-tube, and then enter the drainage tube through the connecting hole of the drainage tube, ultimately draining into the duodenum. Multiple sets of side-hole connecting tubes and through-tubes form a multi-channel drainage system, significantly increasing the drainage area. The corrugated tube ensures the drainage channel remains unobstructed, effectively preventing sludge buildup and blockage, extending the lifespan of the stent, and reducing the frequency of stent replacements. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the present invention; Figure 3 This is an enlarged view of the structure at point A of the present invention; Figure 4 This is an enlarged view of the structure at point B of the present invention.

[0017] In the diagram: 1. Insertion tube; 2. Connecting rib; 3. Sliding groove; 4. Sliding plate; 5. Spherical groove; 6. Connecting rod; 7. Connecting ball; 8. Rack; 9. Communicating groove; 10. Rotating plate; 11. Gear ring; 12. Rotating block; 13. Support plate; 14. Sliding rod; 15. First spring; 16. Contact plate; 17. First limiting piece; 18. Connecting frame; 19. Guide rod; 20. Second limiting piece; 1. Second spring; 22. Connecting pipe; 23. Through pipe; 24. Corrugated pipe; 25. Liquid inlet; 26. Sliding ring; 27. Limiting platform; 28. Collar; 29. ​​Connecting rope; 30. Limiting block; 31. Limiting groove; 32. Threaded wire; 33. Rotating gear plate; 34. Connecting hole; 35. Guide ring; 36. Connecting piece; 37. Connecting groove; 38. Liquid guide pipe; 39. Connecting hole; 40. Support pad. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-4 This invention provides a technical solution: a gallbladder drainage stent for ERCP surgery, comprising an insertion tube 1, which serves as the main body of the stent and provides support and drainage channels. Several sets of connecting ribs 2 are integrally formed and fixedly connected to the outer side of the insertion tube 1. A connecting groove 9 is provided on the outer side of each connecting rib 2. Several sets of rotating plates 10 are rotatably connected to the inside of the connecting groove 9 via medical stainless steel pins. Rotating blocks 12 are rotatably connected to the inner side of the outer end of each rotating plate 10 via medical stainless steel pins. A support plate 13 is integrally formed and fixedly connected to the outer side of each rotating block 12. The support plate 13 has internal gaps on both sides. A sliding rod 14 is provided for the sliding connection. A contact plate 16 is integrally formed and fixedly connected to the outside of the sliding rod 14. Several sets of connecting tubes 22 are fixedly connected between the contact plates 16 by medical silicone. A through tube 23 is fixedly connected between the middle of the connecting tube 22 and the inside of the insertion tube 1 by medical silicone. An inlet 25 is provided on the outside of the connecting tube 22. The connecting tube 22, the through tube 23 and the inlet 25 form a multi-channel drainage system. Bile enters from the inlet 25 and flows into the inside of the insertion tube 1 through the connecting tube 22 and the through tube 23, increasing the drainage area and preventing blockage. The connecting rib 2 has an integrally formed sliding groove 3 that communicates with the connecting groove 9. Several sets of sliding plates 4 are slidably connected within the sliding groove 3 with a clearance fit. The sliding plates 4 are movably connected front and rear. A toothed ring 11 is fixedly connected to the inner and outer sides of the rotating plate 10 by laser welding with medical stainless steel. A toothed rack 8 is meshed with the outer side of the toothed ring 11. The toothed rack 8 is fixedly connected to the sliding plate 4 by adhesive bonding with medical silicone. The meshing of the toothed rack 8 and the toothed ring 11 converts the axial movement of the sliding plate 4 into the rotational movement of the rotating plate 10. A sliding plate 4 is integrally formed and fixedly connected to one end of the insertion tube 1. The sliding ring 26 is integrally formed and fixedly connected to the limiting platform 27 at the other end. The outer side of the sliding ring 26 is slidably connected to the collar 28 with a gap fit. One end of the sliding plate 4 is fixedly connected to the collar 28 by medical silicone adhesive and a connecting rope 29 is slidably connected to the inside of the side wall of the connecting rib 2 with a gap fit. The limiting platform 27 limits the maximum moving distance of the collar 28 to prevent excessive pulling of the connecting rope 29. When the collar 28 moves axially, it pulls all the sliding plates 4 to move synchronously through the connecting rope 29, so that all the rotating plates 10 can be opened synchronously. One end of the sliding plate 4 is fixedly connected to the connecting rod 6 by an integral molding, and the other end of the connecting rod 6 is fixedly connected to the connecting ball 7 by an integral molding. The other end of the sliding plate 4 has an integrally formed spherical groove 5. The connecting ball 7 is rotatably connected to the inside of the spherical groove 5 with a clearance fit. The connecting ball 7 and the spherical groove 5 form a spherical hinge structure, so that adjacent sliding plates 4 can rotate relative to each other. This ensures that when the insertion tube 1 moves in the curved bile duct, the sliding plate 4 can bend synchronously with the insertion tube 1, without jamming or transmission interruption. The two ends of the contact plate 16 are fixedly connected to the support plate 13 by medical silicone adhesive. The first spring 15 is sleeved on the outside of the sliding rod 14 with a clearance fit. The first spring 15 provides elastic support force, so that the contact plate 16 can adapt to the contraction and relaxation movement of the bile duct wall and maintain a stable anchoring force, while avoiding excessive support force that could damage the mucosa. The other end of the sliding rod 14 is fixedly connected to the first limiting piece 17 by integral molding. The first limiting piece 17 prevents the sliding rod 14 from falling out of the support plate 13 and ensures the structural integrity. The inside of the through pipe 23 and both sides of the connecting pipe 22 are integrally formed with corrugated pipes 24. The corrugated pipes 24 have good extensibility and flexibility. When the support plate 13 moves radially, it can automatically extend or shorten, ensuring that the connecting pipe 22 and the through pipe 23 always remain unobstructed and will not be pulled apart or flattened. One end of the sliding plate 4 is integrally formed and fixedly connected to a connecting frame 18. A guide rod 19 is slidably connected inside the connecting frame 18 with a clearance fit. One end of the guide rod 19 is fixedly connected to the inner wall of the sliding groove 3 by medical silicone. The other end of the guide rod 19 is integrally formed and fixedly connected to a second limiting piece 20. A second spring 21 is fixedly connected between the second limiting piece 20 and the connecting frame 18 by medical silicone. The second spring 21 is fitted with a clearance fit on the outside of the guide rod 19. The second spring 21 always pushes the connecting frame 18 and the sliding plate 4 to move away from the collar 28, so that the connecting rope 29 is always in a taut state, ensuring that there is no gap in the transmission. The guide rod 19 provides sliding guidance for the connecting frame 18, ensuring that the sliding plate 4 moves smoothly. The outer side of the sliding ring 26 is integrally formed with several sets of limiting grooves 31. The inner side of the collar 28 is integrally formed and fixedly connected with a limiting block 30. The limiting block 30 is slidably connected to the inside of the limiting groove 31 with a clearance fit. The limiting block 30 cooperates with the limiting groove 31 to restrict the collar 28 to move only along the axial direction and not rotate, so as to ensure that the tension direction of the connecting rope 29 is always consistent with the movement direction of the sliding plate 4, and to prevent the connecting rope 29 from twisting and knotting. The collar 28 has several sets of connecting holes 34 integrally formed inside, which are staggered with the connecting ribs 2. The outermost sliding ring 26 has a threaded line 32 integrally formed on its outer side, and a rotating gear 33 is threadedly connected to the outer side of the threaded line 32. The rotating gear 33 and the collar 28 are rotatably connected through a deep groove ball bearing. Several sets of guide rings 35 are fixedly connected to the outer side of the insertion tube 1, which are directly opposite the connecting holes 34. The connecting holes 34 and the guide rings 35 provide guidance for the external rope, ensuring that the external rope can be accurately connected to the collar 28 of the next section of the insertion tube 1, realizing the synchronous drive of multiple sections of the bracket. Rotating the rotating gear 33 drives the collar 28 to move axially through the threaded transmission, realizing the unfolding and retraction of the bracket. The bearing connection ensures that when the rotating gear 33 rotates, the collar 28 only moves axially and does not rotate with it. One end of the sliding ring 26 is fixedly connected to several sets of connecting pieces 36 facing the connecting ribs 2. The other end of the insertion tube 1 has a connecting groove 37 that matches the connecting pieces 36. The connecting pieces 36 and the connecting groove 37 cooperate to achieve rapid splicing of multiple segments of the insertion tube 1 through a special screw. The length of the stent can be freely combined according to the length of the patient's bile duct. The connecting pieces 36 face the connecting ribs 2 to ensure that the transmission mechanisms of each segment are aligned after splicing, so as to achieve synchronous drive. The insertion tube 1 is fitted with a drainage tube 38, which provides the main drainage channel for bile, draining bile from the bile duct to the duodenum. Several sets of support pads 40 are fixedly connected to the outside of the drainage tube 38 by medical silicone. The support pads 40 fix the drainage tube 38 in the center of the insertion tube 1 to prevent the drainage tube 38 from shifting or blocking the outlet of the through tube 23. The support pads 40 are close to the inner wall of the insertion tube 1. Several sets of connecting holes 39 are integrally formed on the outside of the drainage tube 38, which allow bile in the insertion tube 1 to flow into the drainage tube 28, ensuring smooth drainage.

[0020] Working principle: When using this invention, according to the bile duct length measured by preoperative imaging examination, the corresponding number of insertion tubes 1 are spliced ​​to the required length through connecting pieces 36 and connecting grooves 37; the external rope is connected to the collars 28 of each segment through the connecting hole 34, and the length of each segment of the external rope is adjusted to ensure that when the rotating toothed disc 33 rotates, all collars 28 move synchronously the same distance; the spliced ​​stent is compressed and loaded into the delivery sheath, ready for surgery.

[0021] Following standard ERCP procedures, the guidewire is inserted into the gallbladder through the site of obstruction; the delivery sheath is then advanced into the bile duct along the guidewire, positioning the proximal end of the stent above the obstruction and the distal end within the duodenum; the sheath is slowly withdrawn, releasing the stent into the bile duct, and the stent position is adjusted to the optimal level.

[0022] Using the duodenoscope, the rotating gear 33 is rotated; the threaded drive drives the collar 28 to move axially along the sliding ring 26, and the connecting rope 29 pulls all the sliding plates 4 to move synchronously along the sliding groove 3; the rack 8 drives the gear ring 11 to rotate, causing the rotating plate 10 to unfold outward, pushing the support plate 13 and the contact plate 16 to move radially; the contact plate 16 adapts to the bile duct wall under the action of the first spring 15, completing the anchoring; the second spring 21 always tensions the connecting rope 29 to ensure that the transmission is gapless; the spherical hinged sliding plate 4 ensures that the transmission is continuous when the support is bent.

[0023] After the stent is anchored, the drainage tube 38 is inserted, and the support pad 40 fixes the drainage tube 28 in the center of the insertion tube 1; the bile in the bile duct enters the connecting tube 22 through the inlet 25, flows into the insertion tube 1 through the through tube 23, and then enters the drainage tube 28 through the connecting hole 39 of the drainage tube 38, and finally drains into the duodenum; the corrugated tube 24 automatically expands and contracts when the support plate 13 moves to ensure that the drainage channel is always unobstructed; the first spring 15 adapts to the contraction and relaxation of the bile duct to maintain a stable anchoring force.

[0024] When the drainage is complete and the stent needs to be removed, the duodenoscopic instrument is used to rotate the rotating toothed disc 33 in the opposite direction, causing the collar 28 to move in the opposite direction; the second spring 21 pushes the sliding plate 4 to reset, the rack 8 drives the toothed ring 11 to rotate in the opposite direction, the rotating plate 10 retracts, and the stent returns to its narrow diameter state; the stone retrieval basket is used to cover the proximal end of the stent and slowly pulls it out of the body.

[0025] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0026] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gallbladder drainage stent for ERCP surgery, comprising an insertion tube (1), characterized in that: The insertion tube (1) is fixedly connected to several sets of connecting ribs (2) on the outside. A connecting groove (9) is opened on the outside of the connecting ribs (2). Several sets of rotating plates (10) are rotatably connected inside the connecting groove (9). A rotating block (12) is rotatably connected to the inner side of the outer end of the rotating plate (10). A support plate (13) is fixedly connected to the outside of the rotating block (12) in the same set. A sliding rod (14) is slidably connected to the inside of both sides of the support plate (13). A contact plate (16) is fixedly connected to the outside of the sliding rod (14). Several sets of connecting tubes (22) are fixedly connected between the contact plates (16). A through tube (23) is fixedly connected between the middle part of the connecting tube (22) and the inside of the insertion tube (1). An inlet (25) is opened on the outside of the connecting tube (22).

2. The gallbladder drainage stent for ERCP surgery according to claim 1, characterized in that: The connecting rib (2) has a sliding groove (3) that communicates with the connecting groove (9). Several sets of sliding plates (4) are slidably connected inside the sliding groove (3). The sliding plates (4) are movably connected to each other. A toothed ring (11) is fixedly connected to the outer side of the inner end of the rotating plate (10). A toothed rack (8) is meshed with the outer side of the toothed ring (11). The toothed rack (8) is fixedly connected to the sliding plate (4). A sliding ring (26) is fixedly connected to one end of the insertion tube (1). A limiting platform (27) is fixedly connected to the other end of the sliding ring (26). A collar (28) is slidably connected to the outer side of the sliding ring (26). A connecting rope (29) is fixedly connected between the sliding plate (4) and the collar (28) at one end. The connecting rope (29) is slidably connected to the inside of the side wall of the connecting rib (2).

3. The gallbladder drainage stent for ERCP surgery according to claim 2, characterized in that: One end of the sliding plate (4) is fixedly connected to a connecting rod (6), and the other end of the connecting rod (6) is fixedly connected to a connecting ball (7). A spherical groove (5) is opened inside the other end of the sliding plate (4), and the connecting ball (7) is rotatably connected inside the spherical groove (5).

4. The gallbladder drainage stent for ERCP surgery according to claim 1, characterized in that: A first spring (15) is fixedly connected between the two ends of the contact plate (16) and the support plate (13). The first spring (15) is sleeved on the outside of the sliding rod (14). A first limiting piece (17) is fixedly connected to the other end of the sliding rod (14).

5. The gallbladder drainage stent for ERCP surgery according to claim 1, characterized in that: The through pipe (23) has corrugated pipes (24) integrally formed inside and on both sides of the connecting pipe (22).

6. The gallbladder drainage stent for ERCP surgery according to claim 2, characterized in that: One end of the sliding plate (4) on one side is fixedly connected to a connecting frame (18), and a guide rod (19) is slidably connected inside the connecting frame (18). One end of the guide rod (19) is fixedly connected to the inner wall of the sliding groove (3), and the other end of the guide rod (19) is fixedly connected to a second limiting piece (20). A second spring (21) is fixedly connected between the second limiting piece (20) and the connecting frame (18), and the second spring (21) is sleeved on the outside of the guide rod (19).

7. The gallbladder drainage stent for ERCP surgery according to claim 2, characterized in that: The sliding ring (26) has several sets of limiting grooves (31) on its outer side, and the collar (28) is fixedly connected to a limiting block (30), which is slidably connected to the inside of the limiting groove (31).

8. The gallbladder drainage stent for ERCP surgery according to claim 2, characterized in that: The collar (28) has several sets of connecting holes (34) inside. The connecting holes (34) and the connecting ribs (2) are staggered. The outermost sliding ring (26) has a thread (32) on its outer side. A rotating gear (33) is threaded to the outer side of the thread (32). The rotating gear (33) is rotatably connected to the collar (28). Several sets of guide rings (35) facing the connecting holes (34) are fixedly connected to the outer side of the insertion tube (1).

9. The gallbladder drainage stent for ERCP surgery according to claim 2, characterized in that: One end of the sliding ring (26) is fixedly connected to several sets of connecting pieces (36) facing the connecting ribs (2), and the other end of the insertion tube (1) is provided with a connecting groove (37) that matches the connecting piece (36).

10. The gallbladder drainage stent for ERCP surgery according to claim 1, characterized in that: The insertion tube (1) is fitted with a liquid guide tube (38), and a number of support pads (40) are fixedly connected to the outside of the liquid guide tube (38). The support pads (40) are in close contact with the inner wall of the insertion tube (1), and a number of connecting holes (39) are opened on the outside of the liquid guide tube (38).

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