Biliary tract guide cannula
By designing a biliary guide cannula and changing the cannula direction by pulling tension wire, the problem of endoscopic surgical instruments entering the biliary tract during ERCP surgery is solved, and more efficient and safe acquisition of biliary lesion tissues is achieved.
Patent Information
- Application Number
- CN202421454955.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-06-24
AI Technical Summary
Existing endoscopic surgical instruments such as ordinary biopsy forceps are difficult to directly enter the bile tract during ERCP surgery, and are difficult to operate and have high risks, especially ineffectively entering the intrahepatic bile duct for biopsy.
A biliary guide casing is designed, including a sleeve and an operating tube section, equipped with a pulling tensioning structure and a tensioning wire. By pulling the tensioning wire, the end direction of the cannula is changed toward the biliary duct, and combined with the guidance channels and tensioning channels of different axes to ensure the smooth entry of the instrument into the biliary duct.
It reduces the difficulty and risk of operation, improves the success rate of endoscopic surgical instruments entering the biliary tract, and especially allows for biopsy to penetrate deep into the intrahepatic bile duct for biopsy.
Smart Images
Figure CN223041971U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical devices, in particular to a biliary duct guiding cannula. Background Art
[0002] Due to the particularity of the anatomical structure of the bile duct, when performing endoscopic diagnosis and treatment operations on biliary tract diseases, a special duodenoscope is required for retrograde biliary tract operations. The duodenoscope is a side-viewing endoscope, and there is a large angle between the forceps channel outlet and the duodenal papilla and the biliary tract opening. Most of the instruments for ERCP surgery need to be guided by a guide wire into the biliary tract for operation. (The full Chinese name of ERCP: endoscopic retrograde cholangiopancreatography; it refers to inserting the duodenoscope into the descending part of the duodenum, finding the duodenal papilla, inserting a guide wire through the biopsy channel, and then inserting a contrast catheter along the guide wire to the papilla opening, bile duct or pancreatic duct, injecting contrast agent and then taking an X-ray film to show the technology of the pancreaticobiliary duct. Tissue biopsy of the pancreatic duct or bile duct, etc. will all use ERCP.) Therefore, many commonly used existing endoscopic surgical instruments (forward-viewing endoscopes) cannot be directly applied to ERCP surgery (such as biopsy forceps, snare, etc.), and obtaining biliary tract lesion tissue for pathological diagnosis has extremely important clinical significance for the diagnosis of biliary tract diseases.
[0003] Currently, the common biopsy methods are as follows: 1. The most direct diagnostic method for biliary tract diseases is biopsy. However, the commonly used large-cup biopsy forceps in endoscopy currently have no guide wire guidance, and it is extremely difficult to enter the biliary tract under a duodenoscope, and the risk and failure rate are very high. Moreover, the direction of the biopsy forceps cannot be adjusted, and the biopsy in the biliary tract is relatively blind and almost impossible to reach the intrahepatic bile duct for biopsy.
[0004] 2. Biopsy with a common endoscopic biopsy forceps: The operation is extremely difficult and the risk and failure rate are very high, mainly reflected in: 1) It is extremely difficult for a common biopsy forceps to enter the biliary tract through the duodenal papilla. It is necessary to change the direction of the biopsy forceps head to be coaxial with the bile duct. Without external force assistance, the failure probability of inserting the common biopsy forceps is very high, and this process usually requires papillotomy to be able to proceed, which also greatly increases the risk of bleeding and perforation during the operation. 2) The biopsy with a common biopsy forceps in the bile duct is relatively blind and almost impossible to reach the intrahepatic bile duct for biopsy. Therefore, we provide a biliary duct guiding cannula to solve the above problems. Content of the Utility Model
[0005] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a biliary duct guiding cannula.
[0006] The purpose of the utility model is realized by the following technical solutions:
[0007] A biliary tract guiding cannula, comprising a cannula and an operating tube section that are interconnected. A pulling and tensioning structure is also connected and installed on the cannula. A tensioning wire is provided at the adjustable moving end of the pulling and tensioning structure. The other end of the tensioning wire passes from the inside of the cannula to the outside and is fixedly connected to the end of the cannula away from the operating tube section.
[0008] Preferably, the cannula includes an inserted section and a bent section that are integrally formed. The inserted section and the bent section are both provided with a guiding channel that communicates with each other. A tensioning channel that is not coaxial with the guiding channel for the tensioning wire to pass through is also provided inside the inserted section.
[0009] Preferably, a through hole for the tensioning wire to pass through is provided on the outer surface of the inserted section, which communicates with the end of the tensioning channel away from the operating tube section.
[0010] Preferably, a communication hole is provided on the outer surface of the end of the bent section away from the inserted section, and the communication hole communicates with the guiding channel.
[0011] Preferably, the pulling and tensioning structure includes a mounting portion that communicates with the cannula. An abutting portion is fixedly installed at the end of the mounting portion. A sliding portion is sleeved on the outer surface of the mounting portion. An avoidance groove that communicates with the inside of the mounting portion is provided on the outer surface of the mounting portion. A cross bar that passes through the avoidance groove and enters the inside of the mounting portion is provided in the inner ring of the sliding portion.
[0012] Preferably, a ring groove is provided in the middle of the outer surface of the sliding portion.
[0013] Preferably, a plug is provided at the end of the operating tube section away from the cannula to block its opening. The plug includes a plug body sleeved on the opening at the end of the operating tube section and a blocking portion for closing the opening. The wall thickness of the blocking portion gradually decreases from the outer circle to the center of the circle.
[0014] Preferably, the length formed by the connection of the cannula and the operating tube section is between 180 cm and 220 cm.
[0015] The present utility model has the following advantages:
[0016] 1. When it is necessary to change the direction angle of the end of the cannula in the present utility model, only need to pull the tensioning wire through the pulling and tensioning structure. Since the other end of the tensioning wire is connected to the end of the cannula, when the tensioning wire is pulled, the end of the cannula is bent to change the direction, making it face the biliary tract, so that the endoscopic surgical instrument can more easily pass through the duodenal papilla and enter the biliary tract, and reduce the operation difficulty and risk.
[0017] 2. By arranging the tensioning channel for the tensioning wire and the guiding channel for the surgical instrument non - coaxially, the present utility model prevents interference between the two during the operation, which may affect the operation. The two are independent of each other and do not affect each other.
[0018] 3. By making the thickness of the plugging part gradually decrease from the outer circle to the center of the circle, the surgical instrument can easily pierce into the operation pipe section and the sleeve, and it can also prevent the opening from being too large, so as to avoid the overflow of intestinal gas and affect the operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the overall structure of the sleeve of the present utility model in the bent state.
[0020] Figure 2 It is a schematic diagram of the overall structure of the sleeve of the present utility model in the unfolded state.
[0021] Figure 3 It is a schematic diagram of the structure of the plug of the present utility model.
[0022] Figure 4 It is a schematic diagram of the positional relationship between the guiding channel and the tensioning channel of the present utility model.
[0023] Figure 5 It is a schematic cross - sectional view of the tensioning structure of the present utility model.
[0024] Figure 6 It is a schematic sectional view of the tensioning structure of the present utility model.
[0025] In the figure, 1. Sleeve; 11. Deep - in section; 12. Bending section; 13. Guiding channel; 14. Tensioning channel; 2. Operation pipe section; 3. Tensioning structure; 31. Installation part; 32. Contact part; 33. Sliding part; 34. Avoidance groove; 35. Cross bar; 4. Tensioning wire; 5. Through - hole; 6. Communication hole; 7. Plug; 71. Plug body; 72. Plugging part; 8. Guide wire. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0026] To make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0027] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0028] Such as Figure 1 — Figure 6 The embodiments shown.
[0029] A biliary tract guiding cannula, comprising a cannula 1 and an operating tube section 2 that are in communication with each other. A pulling and tensioning structure 3 is also communicatively installed on the cannula 1. A tensioning wire 4 is provided at the adjusting and moving end of the pulling and tensioning structure 3. The other end of the tensioning wire 4 passes from the inside of the cannula 1 to the outside thereof and is fixedly connected to the end of the cannula 1 away from the operating tube section 2.
[0030] Refer to Figure 1 And Figure 2 As shown, during use, it can be positioned at the duodenal papilla in cooperation with a duodenoscope through 1. When 1 needs to enter the biliary tract for angle adjustment, only by pulling 4 through 3, the end of 1 can be bent to make it tend towards the biliary tract direction and enter the duct to complete. When a biopsy is required, only by inserting 2 into 1 to change the direction of the biopsy forceps so that it can smoothly enter the biliary tract, the problem that the existing ordinary biopsy forceps are blindly unable to enter the bile duct for biopsy is solved.
[0031] The cannula 1 includes an inserted section 11 and a bent section 12 that are integrally formed. The inserted section 11 and the bent section 12 are both provided with guiding channels 13 that are in communication with each other. A tensioning channel 14 that is not coaxial with the guiding channel 13 for the tensioning wire 4 to pass through is also provided inside the inserted section 11.
[0032] A through hole 5 for the tensioning wire 4 to pass through is provided on the outer surface of the inserted section 11 and is in communication with the end of the tensioning channel 14 away from the operating tube section 2.
[0033] Refer to Figure 1 、 Figure 2 And Figure 4As shown, the tension wire 4 passes through the tension channel 14 and extends to the outside through the through hole 5, and the end of the tension wire 4 is connected to the end of the bending section 12. Therefore, when it is necessary to adjust the bending direction of the bending section 12, only by pulling the tension structure 3 to tension the tension wire 4 to contract, the bending section 12 can be bent at a certain angle. The specific bending angle can be adjusted according to the needs by pulling the moving distance of the tension wire 4 during the actual operation, and the specific angle is not limited here.
[0034] A communication hole 6 is formed on the outer surface of the end of the bending section 12 away from the deepening section 11, and the communication hole 6 communicates with the guiding channel 13.
[0035] Refer to Figure 1 and Figure 2 As shown, when in use, it can enter the descending part of the duodenum through the duodenoscope, locate to the duodenal papilla, the guide wire 8 passes through the duodenoscope and retrogradely enters the single tube through the duodenal papilla, and operations such as intubation and imaging are performed. Then, the communication hole 6 at the position of the bending section 12 passes through the guide wire 8 left in the biliary tract, and the bending section 12 and the deepening section 11 enter the biliary tract under the guidance of the guide wire 8. During the entry process, the bending degree of the bending section 12 can be adjusted by pulling the tension structure 3 to enable it to smoothly enter the biliary tract.
[0036] The pulling and tensioning structure 3 includes a mounting portion 31 communicated with the sleeve 1. An abutting portion 32 is fixedly installed at the end of the mounting portion 31. A sliding portion 33 is sleeved on the outer surface of the mounting portion 31. An avoidance groove 34 communicated with the inside of the mounting portion 31 is formed on the outer surface of the mounting portion 31. A cross bar 35 passing through the avoidance groove 34 and entering the inside of the mounting portion 31 is arranged in the inner circle of the sliding portion 33; a ring groove is formed in the middle of the outer surface of the sliding portion 33.
[0037] Refer to Figure 1 、 Figure 2 and Figure 5 As shown, when it is necessary to pull the bending section 12 to adjust the bending angle, first, the thumb can be abutted against the position of the abutting portion 32, and the index finger and middle finger can be buckled into the ring groove (not marked in the figure) at the position of the sliding portion 33. The sliding portion 33 is driven to move by the index finger and middle finger, so as to drive the cross bar 35 in the sliding portion 33 to move, and further drive the tension wire 4 connected to the cross bar 35 to be tightened or relaxed, achieving the effect of changing the bending degree of the bending section 12.
[0038] A plug 7 for blocking the opening is arranged at the end of the operating pipe section 2 away from the sleeve 1; the plug 7 includes a plug body 71 sleeved on the opening at the end of the operating pipe section 2 and a blocking portion 72 for closing the opening. The wall thickness of the blocking portion 72 gradually decreases from the outer circle to the center of the circle.
[0039] Refer to Figures 1 to 3 As shown, when a biopsy needs to be performed through an instrument (such as a biopsy forceps), it can enter the deep section 11 and the bending section 12 through the opening of the operating tube section 2. Specifically, the biopsy forceps can penetrate through the blocking part 72 and enter the operating tube section 2, and then enter the deep section 11 and the bending section 12. Since the wall thickness of the blocking part 72 gradually decreases from the outer circle to the center of the circle, it is convenient for the biopsy forceps to penetrate, and it can also prevent the penetration opening from being too large, resulting in the overflow of intestinal gas and affecting the operation.
[0040] The length formed by the connection of the sleeve 1 and the operating tube section 2 is between 180 cm and 220 cm.
[0041] In this embodiment, the length formed by the sleeve 1 and the operating tube section 2 is 200 cm. In practice, it can be increased or shortened according to needs, and it can be less than 180 cm or greater than 220 cm. Specifically, it is not limited here.
[0042] In this embodiment, the diameter of the communication hole 6 is 1 mm, and the length of the bending section 12 is 3 cm. In practice, the above data can be adjusted according to needs and are not limited here; the diameter of the communication hole 6 is 0.5 mm to 1.5 mm. In this embodiment, the diameter of the communication hole is 1 mm.
[0043] The working process of the present utility model is as follows: First, the sleeve 1 is cooperated with the duodenoscope to enter the descending part of the duodenum, so as to be positioned at the position of the duodenal papilla. The guide wire 8 enters the bile duct retrogradely through the duodenal papilla and performs operations such as intubation and angiography. When a biopsy needs to be performed, the communication hole 6 at the position of the bending section 12 penetrates through the guide wire 8 left in the bile duct, and the bending section 12 and the deep section 11 are guided by the guide wire 8 to enter the bile duct. When entering, the tension wire 4 can be tightened or relaxed by pulling the tension structure 3 according to needs to change the bending of the bending section 12 and adjust the angle so as to smoothly enter the bile duct; during the biopsy, the biopsy penetrates through the blocking plug 7 and enters the operating tube section 2, the deep section 11 and the bending section 12, so as to enter the bile duct for biopsy.
[0044] Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A bile duct guide cannula, characterized in that: The invention comprises a sleeve (1) and an operating pipe section (2) which are interconnected, wherein a pulling and tensioning structure (3) is also installed on the sleeve (1), and a tensioning wire (4) is arranged at the adjustable movable end of the pulling and tensioning structure (3), and the other end of the tensioning wire (4) passes from the inside of the sleeve (1) to the outside thereof and is fixedly connected to the end of the sleeve (1) away from the operating pipe section (2).
2. A biliary guide cannula according to claim 1, characterized in that: The sleeve (1) comprises an integrally formed deep-entry section (11) and a curved section (12); the deep-entry section (11) and the curved section (12) are both provided with mutually communicating guide channels (13); and the deep-entry section (11) is also provided with a tensioning channel (14) which is coaxial with the guide channel (13) and is provided inside the deep-entry section (11) for the tensioning wire (4) to pass through.
3. A biliary guide cannula according to claim 2, characterized in that: The outer surface of the deep section (11) is provided with a through hole (5) which is connected to the end of the tensioning channel (14) away from the operating pipe section (2) and is used for the tensioning wire (4) to pass through.
4. A biliary guide cannula according to claim 2, characterized in that: A connecting hole (6) is formed on the outer surface of the end of the curved section (12) away from the deep section (11), and the connecting hole (6) is connected to the guide channel (13).
5. A biliary guide cannula according to claim 1, characterized in that: The pulling and tensioning structure (3) comprises a mounting portion (31) connected to the sleeve (1), an abutment portion (32) being fixedly mounted on the end of the mounting portion (31), a sliding portion (33) being sleeved on the outer surface of the mounting portion (31), an avoidance groove (34) being arranged on the outer surface of the mounting portion (31) and being connected to the interior of the mounting portion (31), and a cross bar (35) passing through the avoidance groove (34) and entering into the interior of the mounting portion (31) being arranged in the inner circle of the sliding portion (33).
6. A biliary guide cannula according to claim 5, characterized in that: An annular groove is provided in the middle of the outer surface of the sliding portion (33).
7. A biliary guide cannula according to claim 1, characterized in that: The end of the operating tube section (2) away from the sleeve (1) is provided with a sealing plug (7) for sealing the opening thereof; the sealing plug (7) comprises a plug body (71) sleeved on the end opening of the operating tube section (2) and a sealing portion (72) for sealing the opening, and the wall thickness of the sealing portion (72) gradually decreases from the outer circle to the center of the circle.
8. The biliary guide cannula according to claim 1, characterized in that: The length of the connected sleeve (1) and the operating pipe section (2) is between 180 cm and 220 cm.