Biliary stent conveying system

Abstract

The invention discloses a biliary stent conveying system. The biliary stent conveying system comprises a system body. The far end of the system main body is connected with an outer sleeve, a hypotube is coaxially arranged in the liner tube, one end of the hypotube is connected with a push resistance block, a stent main body is arranged outside a far-end tube of the push resistance block, and a Tip head is arranged at the far end of the far-end tube; a grinding rod is connected to the outer part of the near-end edge of the hypotube, extends out of the outer sleeve and is connected with the system main body; the center of the near end of the hypotube is connected with an inner tube, and a guide wire penetrates in from the Tip head and penetrates out from the near end of the outer sleeve. By optimizing a guide wire path, reducing biliary tract mucosa injury and guide wire jamming through an arc-shaped quick-change opening in the near end of the outer sleeve, fixing the inner tube through a grinding rod gradually-changing diameter structure, and matching with a stent formed by an open type supporting ring and an S-shaped wave crest staggered connecting bridge, the stent has bending rigidity and radial expansion adherence, axial shortening can be compensated, interference is avoided, and the stent is suitable for large-scale popularization and application. The multi-effect that the surgical operation is convenient and efficient, the injury and risk of a patient are reduced, and the stent performance is excellent is achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical devices, and in particular relates to a biliary stent delivery system. Background Art

[0002] Malignant obstructive jaundice is caused by various malignant tumors that lead to bile duct obstruction and intrahepatic bile stasis, resulting in abnormal bilirubin. If obstructive jaundice is not relieved in time and the obstruction lasts for a long time, it will lead to serious functional damage to multiple important organs such as the heart, liver, and kidneys. In the past, the main treatment methods were radical resection or palliative jaundice reduction treatment by surgery. The treatment method of malignant obstructive jaundice with biliary stents is to place the stent at the site of bile duct obstruction, so that the bile accumulated in the liver flows into the duodenum along the physiological channel, restoring the enterohepatic circulation and intestinal microecology. Patients do not have to carry a drainage bag for a long time, which reduces the probability of infection and improves the quality of life.

[0003] Biliary stents in related technologies are mostly metal. During ERCP, the guidewire is long (over 4 meters). Because it runs through the entire catheter, it must remain in place during instrument changes. Medical staff are often required to secure the guidewire to ensure its stability, a cumbersome and time-consuming process. Furthermore, because the guidewire occupies the entire catheter lumen, partial withdrawal is required during injection of the desired agent, potentially leading to delayed imaging or wasted injection, impacting treatment effectiveness. Summary of the Invention

[0004] The purpose of the present invention is to provide a biliary stent delivery system to solve the problems in the prior art.

[0005] To this end, the present invention provides a biliary stent delivery system, comprising: a system body;

[0006] The distal end of the system body is connected to an outer sleeve, a hypotube is coaxially arranged inside the outer sleeve, one end of the hypotube is connected to a push block, a support body is arranged outside the distal end of the push block, and a tip head is arranged at the distal end of the distal tube;

[0007] A grinding rod is externally connected to the proximal edge of the hypotube, and the grinding rod extends out of the outer sleeve and is connected to the system body;

[0008] The inner tube is connected to the proximal center of the hypotube, and the guide wire passes through the tip head and out from the proximal end of the outer sleeve.

[0009] As a further description of the above technical solution, the proximal end of the grinding rod is connected to a liner, and the liner is connected to the system body.

[0010] As a further description of the above technical solution, the system body includes a handle, the distal end of the handle is connected to a stainless steel tube, the distal end of the stainless steel tube is connected to a Y-type valve, the distal end of the Y-type valve is connected to a transition valve, the distal end of the transition valve is connected to a stress diffusion tube, the distal end of the stress diffusion tube is connected to a thick outer tube, the distal end of the thick outer tube is connected to a thin outer tube, and the thin outer tube is connected to the grinding rod.

[0011] As a further description of the above technical solution, the length of the outer sleeve is 28-35CM.

[0012] As a further description of the above technical solution, a quick-change port is provided at the proximal end of the outer sleeve, and the quick-change port is an arc-shaped opening, and the arc-shaped opening corresponds to the end position of the inner tube.

[0013] As a further description of the above technical solution, the diameter of the grinding rod gradually increases from the portion connected to the hypotube to the portion in contact with the inner tube.

[0014] As a further description of the above technical solution, the stent body includes a plurality of support rings, and a plurality of connecting bridges are connected between adjacent support rings.

[0015] As a further description of the above technical solution, the connecting bridge is an S-shaped structure.

[0016] As a further description of the above technical solution, the connection mode of the connecting bridges between adjacent support rings is a wave crest staggered connection.

[0017] As a further description of the above technical solution, the support ring and the connecting bridge are both open structures.

[0018] Beneficial effects:

[0019] 1. The present invention provides a biliary stent delivery system that optimizes the guidewire path, reduces biliary mucosal damage and guidewire jamming through an arc-shaped quick-change port at the proximal end of the outer sleeve, and fixes the inner tube with a grinding rod with a gradient diameter structure. The stent, which is composed of an open support ring and an S-shaped wave crest staggered connecting bridge, has both bending rigidity and radial expansion and wall adhesion, can compensate for axial shortening and avoid interference, thereby achieving multiple benefits: convenient and efficient surgical operation, reduced patient damage and risk, and excellent stent performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is a schematic structural diagram of the biliary stent delivery system provided by the present invention.

[0022] Figure 2 This is a schematic structural diagram of a partial cross-section of the biliary stent delivery system provided by the present invention.

[0023] Figure 3 This is an enlarged cross-sectional schematic diagram of the distal end of the biliary stent delivery system provided by the present invention.

[0024] Figure 4 This is a schematic diagram of the internal structure of the distal outer sleeve of the biliary stent delivery system provided by the present invention.

[0025] Figure 5 This is a schematic diagram of the cooperation between the distal inner tube and the outer sleeve of the biliary stent delivery system provided by the present invention.

[0026] Figure 6 This is a schematic cross-sectional view of a biliary stent in the biliary stent delivery system provided by the present invention.

[0027] Figure 7 for Figure 5 Enlarged schematic diagram of the connecting bridge.

[0028] Figure 8 Schematic diagram of the connection method of the connecting bridges of adjacent support rings.

[0029] Figure 9 Schematic diagram of the stretching and deformation compensation of the connecting bridge.

[0030] In the figure: 1. handle; 2. stainless steel tube; 3. Y-type valve; 4. transition valve; 5. stress diffusion tube; 6. thick outer tube; 7. thin outer tube; 8. outer sleeve; 9. liner; 10. inner tube; 11. grinding rod; 12. hypotube; 13. push block; 14. developing ring; 15. tip head; 16. bracket body; 1601. connecting bridge; 1602. support ring. DETAILED DESCRIPTION

[0031] The present invention may be more readily understood by referring to the following detailed description of preferred embodiments of the present invention and the included Examples. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. In the event of a conflict, the definitions in this specification shall prevail.

[0032] like Figure 1-6 As shown, a biliary stent delivery system includes: a system body, wherein the system body includes a handle 1 and related connecting tubes for connecting the handle 1 with the outer sleeve 8 and the hypotube 12 described below;

[0033] The distal end of the system body is connected to an outer sleeve 8, a hypotube 12 is coaxially arranged inside the outer sleeve 8, one end of the hypotube 12 is connected to a push block 13, a stent body 16 is arranged on the distal end of the push block 13, and a tip head 15 is arranged at the distal end of the distal tube. The provision of the tip head 15 makes it easier to deliver the delivery system to the target location;

[0034] The proximal edge of the hypotube 12 is externally connected to a grinding rod 11, which extends out of the outer sleeve 8 and is connected to the system body. By setting the hypotube 12, the operator's pushing force can be transmitted to the end of the stent, i.e., the Tip head 15, without loss, avoiding force dispersion caused by catheter deformation during the pushing process, and ensuring that the stent is accurately released and deployed against the wall in the stricture section of the bile duct.

[0035] The inner tube 10 is connected to the proximal center of the hypotube 12. The inner tube 10 passes through the hypotube 12, the push block 13 and extends from the distal end of the Tip head 15. The bracket body 16 is sleeved on the outside of the inner tube 10 between the push block 13 and the Tip head 15. The inner tube 10 itself is a hollow structure. The guide wire enters from the Tip head 15 and exits from the proximal end of the outer sleeve 8. Since the outer sleeve 8 is only provided at a part of the end of the delivery system, and the length of the outer sleeve 8 is relatively short, and the grinding rod 11 is eccentrically connected to the hypotube 12, there is enough space in the center of the outer sleeve 8 to facilitate the passage of the guide wire, thereby realizing the insertion of the guide wire from the Tip. It can be directly passed out from the quick exchange port of the outer sleeve 8 through the lumen of the inner tube 10. The operator only needs to use a 1.8-meter-long guide wire, which reduces the number of operating steps and shortens the operation time. It is especially suitable for complex lesions or situations where frequent instrument replacement is required. When injecting contrast agent or developer, the dosage can be reduced to reduce the risk of renal damage to the patient.

[0036] Specifically, the guidewire is pre-delivered to the target location through a medical device such as a duodenoscope. After the delivery system of the present application delivers the guidewire to the target location along the guidewire path, the guidewire is inserted from the tip head 15 and passes through the inner tube 10 to exit from the quick exchange port of the outer tube 8. In some embodiments, the length of the outer tube 8 is 28-35CM, preferably 30CM. This eliminates the need for the guidewire to pass through the catheter, making it more convenient to replace the device. At the same time, the guidewire does not occupy the inner cavity of the entire delivery system, which can effectively reduce the waste of drugs.

[0037] Optionally, the proximal end of the grinding rod 11 is connected to the handle 1, and the distal end of the grinding rod 11 is connected to the sea wave tube 12. At the same time, the outer part of the proximal end of the grinding rod 11 is provided with a liner 9, and the liner 9 is connected to the system body, wherein the system body includes a handle 1, the distal end of the handle 1 is connected to a stainless steel tube 2, the distal end of the stainless steel tube 2 is connected to a Y-type valve 3, the distal end of the Y-type valve 3 is connected to a transition valve 4, the distal end of the transition valve 4 is connected to a stress diffusion tube 5, the distal end of the stress diffusion tube 5 is connected to a thick outer tube 6, the distal end of the thick outer tube 6 is connected to a thin outer tube 7, and the liner 9 is simultaneously sleeved on the outside of the thin outer tube 7 to facilitate welding with the external outer sleeve 8.

[0038] Optionally, a quick-change port is provided at the proximal end of the outer tube 8, and the quick-change port is an arc-shaped opening, which corresponds to the end position of the inner tube 10. By providing the quick-change port, and the quick-change port is an arc-shaped opening, on the one hand, the damage to the biliary mucosa caused by the end of the conventional catheter during the delivery process can be reduced. On the other hand, the quick-change port is an arc-shaped opening, which prevents the guide wire from getting stuck or scratching the inner wall of the outer tube 8 during rapid exchange, ensuring that the guide wire quickly passes through the inner cavity of the outer tube 8 and shortening the instrument replacement time.

[0039] Optionally, the diameter of the grinding rod 11 gradually increases from the part connected to the hypotube 12 to the part fitted with the inner tube 10, and the smaller end is connected to the outer edge of the hypotube 12 to achieve an eccentric connection between the grinding rod 11 and the hypotube 12, thereby providing space for the delivery of the guide wire, while the larger end can be connected to the inner tube 10 through the developing ring 14, which can fix the inner tube 10 to a certain extent and reduce the irregular shaking of the inner tube 10.

[0040] Optionally, refer to Figure 6-Figure 9 The stent body 16 has equal height support units as support rings 1602, and an S-shaped structure as a connecting bridge 1601. The connection between the connecting bridge 1601 and the supporting ring 1602 is open, that is, on the same supporting ring 1602, there is one or more crests or troughs in the mesh formed by two adjacent connecting bridges 1601. The connecting bridge 1601 and the supporting ring 1602 adopt an open structure, which can improve the bending stiffness of the stent. After self-expansion, it can also have a certain degree of flexibility in the curved and narrow section, such as Figure 7 shown.

[0041] Optionally, the stent body 16 adopts 16 support rings 1602 in the radial direction, which has a greater expansion force. The support rings 1602 are arranged out of phase. The connecting bridges 1601 on both sides of a single cycle adopt a "peak-peak" connection, and the four staggered peaks are connected to form an S shape. Specifically, Figure 8As shown, the connection mode of the connecting bridge 1601 between two adjacent support rings 1602 is that one section of the connecting bridge 1601 is connected to one of the wave crests of the support ring 1602, and the other section of the connecting bridge 1601 is connected to the position of the adjacent support ring 1602 offset by four wave crests.

[0042] The four S-shaped bridges 1601 connecting two adjacent support rings 1602 create a larger spacing between the wave crests of the two adjacent rows of support rings 1602. This prevents interference between the support rings 1602 and the bridges 1601 during the crimping and bending processes of the stent, while also providing a certain degree of expansion force. Specifically, if the two ends of the bridge 1601 are connected to the corresponding wave crests of two adjacent support rings 1602 while maintaining the same spacing as in the above solution, the bridge 1601 will be compressed, which may create the risk of interference between adjacent bridges 1601 or between a bridge 1601 and a support ring 1602.

[0043] During the self-expanding process, when the S-shaped connecting bridge 1601 radially expands the bile duct stricture section, the S-shaped bend of the connecting bridge 1601 will compensate for the radial deformation, thereby improving the overall axial shortening of the stent caused by the shortening of the radial expansion length of the support ring 1602. Figure 9 As shown, A is the position where the connecting bridge 1601 is stretched, and B is the position where the deformation is compensated.

[0044] In summary, the biliary stent of the present invention has a simple structure, is easy to process, has good bending rigidity, is symmetrical in both radial and axial directions, can expand evenly during expansion, and fits more closely to the bile duct.

[0045] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A biliary stent delivery system, characterized in that: include: System subject; The distal end of the system body is connected to an outer sleeve, a hypotube is coaxially arranged inside the outer sleeve, one end of the hypotube is connected to a push block, a support body is arranged outside the distal end of the push block, and a tip head is arranged at the distal end of the distal tube; A grinding rod is externally connected to the proximal edge of the hypotube, and the grinding rod extends out of the outer sleeve and is connected to the system body; An inner tube is connected to the proximal center of the hypotube, and a guide wire passes through the tip head and out of the proximal end of the outer sleeve.

2. The biliary stent delivery system according to claim 1, characterized in that: The proximal end of the grinding rod is connected with a liner, and the liner is connected to the system body.

3. The biliary stent delivery system according to claim 1, characterized in that: The system body includes a handle, the distal end of the handle is connected to a stainless steel tube, the distal end of the stainless steel tube is connected to a Y-type valve, the distal end of the Y-type valve is connected to a transition valve, the distal end of the transition valve is connected to a stress diffusion tube, the distal end of the stress diffusion tube is connected to a thick outer tube, the distal end of the thick outer tube is connected to a thin outer tube, and the thin outer tube is connected to the grinding rod.

4. The biliary stent delivery system according to claim 1, characterized in that: The length of the outer sleeve is 28-35CM.

5. The biliary stent delivery system according to claim 1, characterized in that: The proximal end of the outer tube is provided with a quick-change port, which is an arc-shaped opening corresponding to the end position of the inner tube.

6. The biliary stent delivery system according to claim 1, characterized in that: The diameter of the grinding rod gradually increases from the portion connected to the hypotube to the portion fitted with the inner tube.

7. The biliary stent delivery system according to claim 1, characterized in that: The support body includes a plurality of support rings, and a plurality of connecting bridges are connected between adjacent support rings.

8. The biliary stent delivery system according to claim 7, characterized in that: The connecting bridge is an S-shaped structure.

9. The biliary stent delivery system according to claim 7, characterized in that: The connection mode of the connecting bridges between adjacent support rings is wave crest staggered connection.

10. The biliary stent delivery system according to claim 7, characterized in that: The supporting ring and the connecting bridge are both open structures.

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