Novel drainage tube capturing device

Abstract

The embodiment of the invention relates to the technical field of medical auxiliary equipment, in particular to a novel drainage tube capturing device. A novel drainage tube capturing device comprises a net basket, a first catheter, a second catheter, a sliding block and a handle, the second catheter is sleeved with the first catheter, the first catheter is connected with the handle, the sliding block is arranged on the handle in a sliding mode, the sliding block is connected with the second catheter, and the sliding block pushes the second catheter to move relative to the first catheter. The net basket is arranged at the tail end of the second guide pipe. According to the drainage tube capturing device, the tube inserting distance can be reduced, the time of the drainage tube in the mouth-nose exchange process can be shortened, the exchange process of the drainage tube can be completed in the oral cavity, meanwhile, the capturing condition of the drainage tube can be observed through an endoscope, exchange of the drainage tube can be completed more rapidly, and the operation efficiency is improved. Therefore, pain brought to a patient during intubation and extubation is reduced.

Description

TECHNICAL FIELD

[0001] The embodiments of the present specification relate to the technical field of medical auxiliary equipment, and in particular to a new drainage tube capturing device. BACKGROUND

[0002] Naso-biliary drainage tube (ENBD, Endoscopic Naso Biliary Drainage) is a kind of external drainage technology of biliary tract established by endoscopy, which is developed on the basis of retrograde pancreatobiliary ductography (ERCP) for the first time. The core purpose is to quickly relieve biliary obstruction and reduce biliary pressure through external drainage of bile, so as to relieve jaundice and control infection, especially for acute suppurative obstructive cholangitis and biliary pancreatitis. Compared with traditional open surgery, ENBD has the advantages of small trauma, rapid recovery and fewer complications, and has become an important minimally invasive treatment for biliary and pancreatic diseases. In the process of replacing and fixing the naso-biliary drainage tube, the oral-nasal conversion is needed, and the catheter is guided out of the oral cavity through the nasal cavity through the nasal guide tube (hose) to avoid folding in the throat. When fixed, the "U-shaped" path is adopted to reduce the risk of pulling. During the process of guiding the catheter out of the oral cavity through the nasal cavity through the nasal guide tube (hose), the patient needs to suffer the double pain of intubation and extubation. Therefore, it is necessary to study the technology for improving the oral-nasal conversion process. SUMMARY

[0003] In order to reduce the pain caused by intubation and extubation, the present application proposes a new drainage tube capturing device.

[0004] The embodiment of the present specification provides a new drainage tube capturing device, which comprises a basket, a first catheter, a second catheter, a sliding block and a handle, the first catheter is sleeved outside the second catheter, the first catheter is connected with the handle, the sliding block is slidingly arranged on the handle, the sliding block is connected with the second catheter, the sliding block drives the second catheter to move relative to the first catheter, and the basket is arranged at the end of the second catheter. The basket comprises a metal ball head, a plurality of nickel-titanium wires and a metal ring, one end of the nickel-titanium wire is connected with the second catheter through the metal ring, the nickel-titanium wire is fixedly connected with the metal ring, the metal ball head is fixedly arranged at the end of the nickel-titanium wire, and the other end of the nickel-titanium wire is connected with the metal ball head and the metal ring respectively.

[0005] Further, the basket comprises four nickel-titanium wires, one end of the nickel-titanium wire penetrates into the metal ball head and is fixed, and after baking, the nickel-titanium wire is shaped into a basket shape, and the other end of the nickel-titanium wire is connected with the metal ring and fixed on the second catheter.

[0006] Further, the rear end of the nickel-titanium wire is welded with the metal ring.

[0007] Further, the metal ring is connected with the second catheter, and the basket moves with the second catheter.

[0008] Further, the second catheter is internally provided with a second catheter lumen for the endoscope to pass through.

[0009] Further, the handle is provided with a cavity, and the second catheter passes through the cavity and penetrates the handle.

[0010] Further, the handle is provided with an elastic slide rod, and the sliding block is mounted on the elastic slide rod, and the sliding block is in contact with the outer wall of the second catheter when pressed, and the bottom of the sliding block is provided with a notch for increasing the friction with the second catheter.

[0011] The technical solutions provided by some embodiments of the present specification have at least the following beneficial effects:

[0012] 1. The drainage tube capturing device provided by the present specification can reduce the intubation distance, shorten the time of the nasobiliary drainage tube in the oral-nasal exchange process, and can complete the exchange process of the nasobiliary drainage tube inside the oral cavity, and can use an endoscope to observe the capturing of the drainage tube, and can more quickly complete the exchange of the nasobiliary drainage tube, thereby reducing the pain of the patient during intubation and extubation.

[0013] 2. The nitinol wire mesh basket in the drainage tube capturing device provided by the present specification is shaped and welded by baking, which guarantees the shape memory function and durability, and in addition, the mesh basket can be contracted or dilated by means of the second catheter when the first catheter is moved, which can improve the capturing reliability.

[0014] Other features and advantages of the embodiments of the present specification will be further disclosed in the specific embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present specification, the accompanying drawings required to be used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present specification, and other accompanying drawings can also be obtained by those skilled in the art without any creative labor on the basis of these accompanying drawings.

[0016] Figure 1 is a schematic diagram of the overall structure of the drainage tube capturing device of one embodiment of the present application.

[0017] Figure 2 is a front view schematic diagram of the drainage tube capturing part of one embodiment of the present application.

[0018] Figure 3 is a cross-sectional schematic diagram of the drainage tube capturing part of one embodiment of the present application.

[0019] Figure 4 is a cross-sectional schematic diagram of the handle of one embodiment of the present application.

[0020] Figure 5 is a three-dimensional schematic view of a drainage tube capturing device according to an embodiment of the present application.

[0021] Figure 6 is a schematic view of an operation mode 1 according to an embodiment of the present application.

[0022] Figure 7 is a schematic view of an operation mode 2 according to an embodiment of the present application.

[0023] The reference signs are as follows: 1, mesh basket; 11, metal ball head; 12, nickel-titanium wire; 13, metal ring; 2, first catheter; 21, first catheter lumen; 3, second catheter; 31, second catheter lumen; 4, sliding block; 5, handle; 6, elastic sliding rod. DETAILED DESCRIPTION

[0024] The technical solutions of the embodiments of the present application will be explained and described below in combination with the drawings of the embodiments of the present application. The following embodiments are only preferred embodiments of the present application, and are not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0025] The terms "first", "second", "third", etc. in the specification and claims of the present application and the above drawings are used to distinguish different objects, and are not used to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0026] In the following description, the appearance of terms such as "inner", "outer", "upper", "lower", "left", "right", etc. indicates the orientation or positional relationship only for the convenience of describing the embodiments and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0027] Before introducing the technical solutions recorded in the present application, the application scenarios of the technical solutions are introduced.

[0028] In the field of modern minimally invasive surgery, endoscopic retrograde cholangiopancreatography (ERCP) and its derivative treatment techniques, such as endoscopic nasobiliary drainage (ENBD), have become the core means for treating diseases of the biliary and pancreatic systems, especially acute obstructive suppurative cholangitis and biliary pancreatitis. This technique involves inserting a specially designed nasobiliary drainage tube into the common bile duct under endoscopic guidance, with one end of the tube remaining in the duodenum and the other end being led out of the body through the patient's mouth, throat, and nasal cavity, thereby creating an effective external bile drainage channel. This can quickly reduce the pressure in the biliary tract and control the inflammatory response, creating conditions for subsequent treatment. It is widely used due to its minimal invasiveness and rapid recovery. During the entire ENBD catheterization procedure, a key and challenging step is the conversion of the nasobiliary drainage tube, which has been placed in the digestive tract and led out of the mouth, to a path leading out of the nasal cavity and being fixed, known as the "mouth-to-nose conversion" process. This conversion is necessary because if the drainage tube is directly led out of the mouth and fixed, it will severely affect the patient's eating and speaking functions and is prone to falling out. Leading it out of the nasal cavity and properly fixing it using a "U-shaped" path can minimize the impact on the patient's daily life and ensure the stability of the drainage.

[0029] To achieve this mouth-to-nose conversion, a standard operating paradigm is generally used in current clinical practice: first, the operator inserts a relatively soft and flexible nasogastric tube, usually a thin flexible tube, into one side of the patient's nasal cavity, making it pass through the posterior naris and pharynx until its distal end reaches the oral cavity and is removed. At this point, the guide tube has established a temporary physical channel between the nasal cavity and the oral cavity. Subsequently, the operator uses forceps and other instruments to accurately send the external end of the nasobiliary drainage tube, which has been placed in the oral cavity, into the tube opening of the guide tube in the narrow posterior oral space. After confirming successful docking, the operator withdraws the guide tube from the nasal cavity end, using its traction force to "carry" the nasobiliary drainage tube from the oral cavity to the nasopharynx and finally leading it out of the nostril. The establishment of this technique effectively solved the problem of the nasobiliary drainage tube being easily folded, twisted, or lost in the complex oral-pharyngeal and nasopharyngeal physiological curves due to its soft material, ensuring the smoothness of the mouth-to-nose conversion path and being an important guarantee for the maturity and popularity of ENBD technology.

[0030] However, with the increasingly stringent requirements of clinical medicine for operation accuracy, surgical efficiency and patient comfort, the above technical solution relying on an independent guide tube for "threading - docking - withdrawing" gradually reveals its inherent limitations in dealing with new challenges. The reason lies in the fact that this technical paradigm divides a complete "capture and guide" task into two independent steps, both of which cause significant irritation to the patient. The first step, the insertion process of the guide tube, is an invasive operation on the nasal, nasopharyngeal and oropharyngeal mucosa of the patient. Since this process is mostly "blind" or semi-blind insertion, the guide tube will inevitably rub and press the sensitive tissues along the way, easily inducing the patient's severe stress reactions such as nausea and choking cough, constituting the first pain. Further, after completing the path construction of the guide tube, the operator must perform the second step of operation, i.e. accurately sending the soft and slippery end of the drainage tube into the small opening of the guide tube in the poorly lit and space-limited deep oral cavity. This process not only highly depends on the experience and touch of the operator, but also often needs repeated attempts, each attempt means repeated poking and searching of the instrument in the patient's throat, which undoubtedly aggravates the patient's pain and discomfort, and prolongs the entire operation time, constituting the second pain. Therefore, how to reduce the intubation distance, shorten the time of the nasobiliary drainage tube in the process of oral-nasal exchange, and enable the exchange process of the nasobiliary drainage tube to be completed in the oral cavity, has become a key challenge and technical problem to be solved for the technical personnel in the field.

[0031] To this end, the present specification provides a new drainage tube capture device, please refer to the attached Figure 1 -attached Figure 3 , including a first catheter 2, a second catheter 3, a slider 4, a handle 5 and a basket 1. The first catheter 2 is made of PTFE material, has good flexibility and biocompatibility, and is provided with a first catheter lumen. The second catheter 3 can pass through the first catheter lumen. The second catheter 3 can slide relative to the first catheter 2. The second catheter 3 is also made of PTFE material, and is provided with a second catheter lumen 31 for the endoscope to pass through. The endoscope can pass through the second catheter lumen 31, and the nasobiliary drainage tube can be captured under the visual condition.

[0032] Please refer to the attached Figure 1 -attached Figure 4The first catheter 2 tail is fixedly connected with the handle 5, the handle 5 body is preferably made of medical-grade polycarbonate material, and is integrally formed through a high-precision injection molding process. The material has excellent mechanical strength, biocompatibility and sterilizability. The shape contour of the handle 5 is strictly designed according to the principle of ergonomics, so that the operator can stably hold and accurately control the device with the smallest fatigue in a long time or fine operation. The handle has a cavity, and the second catheter 3 penetrates the handle through the cavity. The handle 5 is provided with an elastic slide rod 6, the sliding block 4 is slidingly installed on the elastic slide rod 6, and the sliding block 4 is connected with the second catheter 3. The sliding block 4 can be in contact with the outer wall of the second catheter 3 only when it is pressed. The bottom of the sliding block 4 is provided with a groove for increasing the friction with the second catheter 3, and the surface thereof is precisely machined to ensure smooth and low-friction sliding of the sliding block 4 when pushing or pulling the second catheter 3. The sliding block 4 pushes the second catheter 3 to move back and forth relative to the first catheter 2.

[0033] Please refer to the attached drawings Figure 1 -attached drawings Figure 3, the basket 1 is provided at the end of the second catheter 3, and the basket 1 comprises a metal ball head 11, a plurality of nickel-titanium wires 12 and a metal ring 13. The nickel-titanium wires 12 have a certain strength and can be used to enhance the axial stability of the basket 1. One end of the nickel-titanium wires 12 is connected with the second catheter 3 through the metal ring 13, and the metal ring 13 is made of medical-grade 316L stainless steel material through micro-turning machining. The inner diameter of the metal ring 13 is accurately matched with the outer diameter of the composite pipe body of the second catheter 3, and the metal ring 13 is firmly and concentrically fixed on the farthest end face of the second catheter 3 through high-precision coaxial laser welding process, thereby forming a solid base. The other end of the nickel-titanium wire 12 is fixedly provided with the metal ball head 11. The metal ball head 11 is located at the top end of the basket 1, and the surface thereof is polished to avoid scratching the tissue. The inside of the metal ball head 11 is laser welded and fixed with the nickel-titanium wire 12. In the embodiment, the number of the nickel-titanium wires 12 is four, and the material thereof is a specially customized nickel-titanium binary alloy. The weight percentage of the nickel element in the nickel-titanium binary alloy is accurately controlled within the range of 55.8%±0.1%, so as to ensure that the nickel-titanium binary alloy has stable and excellent super-elasticity and shape memory effect in a body temperature environment. The diameter of the wire material is 0.3 mm, and the surface thereof is subjected to electrolytic polishing treatment, so that the wire material is relatively smooth. The four nickel-titanium wires are shaped after baking to jointly constitute a basket 1 in a natural and unconstrained state, which is in a spindle shape. The basket 1 has an axial length of 35 mm when fully expanded, and the maximum radial width thereof can reach 25 mm. Such a size design is aimed at creating a wide enough capture window and accommodation volume in the limited space of the oropharynx, so as to easily accommodate the head of the nasobiliary drainage tube with a diameter of about 1.67 mm to 2.67 mm, and effectively capture the nasobiliary drainage tube. In order to further improve the performance, the outer surface of each nickel-titanium wire needs to be subjected to a coating treatment. A 3-micron-thick paclitaxel C coating layer is uniformly deposited on the surface of the nickel-titanium wire through plasma-enhanced chemical vapor deposition technology. The coating layer not only has biocompatibility, but also provides an extremely smooth and low-friction surface, thereby reducing friction during the expansion and contraction of the basket 1, and providing moderate static friction when contacting the nasobiliary drainage tube to enhance the grip.

[0034] One end of the nickel-titanium wire 12 penetrates into the metal ball head 11 for fixation, and the other end of the nickel-titanium wire 12 is connected with the metal ring 13 to be fixed on the second catheter 3. The rear end of the nickel-titanium wire 12 is welded with the metal ring 13, thereby enhancing the connection strength and ensuring that the basket 1 will not be loose or fall off during use. The metal ring 13 is connected with the second catheter 3, and the basket 1 moves with the second catheter 3. The design of the metal ring 13 enables the basket 1 to be flexibly contracted and dilated, thereby facilitating the capture and fixation of the nasobiliary drainage tube. Further, when the first catheter 2 moves relative to the second catheter 3, the first catheter 2 can make the basket 1 contract or dilate.

[0035] Please refer to the accompanying drawings Figure 6 - the accompanying drawings Figure 7A new type of drainage tube capture device is provided for the use process of the present specification.

[0036] Figure 6 For one of the operation modes in the use process, the first catheter 2 is first inserted into the nasal cavity and stays at the junction of the nasal cavity and the oral cavity, and then the second catheter 3 with the net basket 1 is inserted into the cavity of the first catheter 2. As the second catheter 3 is moved, the net basket 1 is also moved to the junction of the oral cavity and the nasal cavity. The endoscope is inserted into the lumen of the second catheter 3 to observe the position of the nasobiliary drainage tube. When the nasobiliary drainage tube enters the range of the net basket 1, the second catheter 3 is moved relative to the first catheter 2 by the sliding block 4, so that the net basket 1 is relaxed and the nasobiliary drainage tube is captured. Finally, the second catheter 3 is slowly moved to tighten the nasobiliary drainage tube captured by the net basket 1. Then, the net basket 1 is contracted by the first catheter 2, and the nasobiliary drainage tube is firmly fixed in the net basket 1. During the tube extraction process, the second catheter 3 is pulled by the sliding block 4, so that the net basket 1 pulls the nasobiliary drainage tube out of the nasal cavity of the patient.

[0037] Figure 7 For another operation mode in the use process, the first catheter 2 stays at the junction of the nasal cavity and the oral cavity, and the second catheter 3 with the net basket 1 and the first catheter 2 are inserted into the oral cavity to the junction of the nasal cavity and the oral cavity. Then, as the second catheter 3 is moved, the net basket 1 is also moved to the junction of the oral cavity and the nasal cavity. The endoscope is inserted into the lumen of the second catheter 3 to observe the first catheter 2 captured by the net basket 1 from the nasal cavity. Finally, the second catheter 3 is slowly moved to tighten the first catheter 2 captured by the net basket 1. The first catheter 2 is pulled out of the oral cavity by pulling the second catheter 3. After the operation is completed, the nasobiliary drainage tube capture device is removed.

[0038] The above-described embodiments are merely preferred embodiment modes of the present specification and do not limit the scope of the present specification. Without departing from the design spirit of the present specification, various modifications and improvements to the technical solutions of the present specification made by those skilled in the art shall fall within the protection scope determined by the claims of the present specification.

Claims

1. A novel drainage tube capture device, characterized in that: The invention comprises a mesh basket (1), a first catheter (2), a second catheter (3), a slider (4) and a handle (5); the first catheter (2) is sleeved on the outside of the second catheter (3); the first catheter (2) is connected to the handle (5); the slider (4) is slidably arranged on the handle (5); the slider (4) is connected to the second catheter (3); the slider (4) pushes the second catheter (3) to move relative to the first catheter (2); the mesh basket (1) is arranged at the end of the second catheter (3); the mesh basket (1) comprises a metal ball head (11), a plurality of nickel-titanium wires (12) and a metal ring (13); one end of the nickel-titanium wire (12) is connected to the second catheter (3) through the metal ring (13); the nickel-titanium wire (12) is fixedly connected to the metal ring (13); the metal ball head (11) is fixedly arranged at the end of the nickel-titanium wire (12); and the two ends of the plurality of nickel-titanium wires (12) are respectively connected to the metal ball head (11) and the metal ring (13).

2. A novel drainage tube capture device according to claim 1, characterized in that: The basket (1) comprises four nickel-titanium wires (12), one end of the nickel-titanium wire (12) is inserted into a metal ball head (11) for fixation, and after baking, the nickel-titanium wire (12) is formed into the shape of the basket (1), and the other end of the nickel-titanium wire (12) is connected to a metal ring (13) to fix it on the second catheter (3).

3. A novel drainage tube capture device according to claim 1, characterized in that: The rear end of the nickel-titanium wire (12) is welded to the metal ring (13).

4. A novel drainage tube capture device according to claim 1, characterized in that: The metal ring (13) is connected to the second conduit (3), and when the second conduit (3) moves, the basket (1) moves accordingly.

5. A novel drainage tube capture device according to claim 1, characterized in that: A second catheter (31) lumen is provided inside the second catheter (3) for the endoscope to pass through.

6. A novel drainage tube capture device according to any one of claims 1 to 3, characterized in that: The handle (5) is provided with a cavity, and the second conduit (3) passes through the handle (5) through the cavity.

7. A novel drainage tube capturing device according to any one of claims 1 to 3, characterized in that: The handle (5) is provided with an elastic slide bar (6), and the slider (4) is mounted on the elastic slide bar (6). The slider (4) can only contact the outer wall of the second conduit (3) when it is pressed. The bottom of the slider (4) is provided with a groove for increasing the friction force with the second conduit (3).

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