Extensible angiographic catheter and interventional catheter assembly

Abstract

The invention relates to the technical field of angiographic catheters, and discloses an extendable angiographic catheter and interventional catheter assembly.The extendable angiographic catheter and interventional catheter assembly comprises an interventional assembly, the interventional assembly is composed of two pipe fittings, a soft part is installed on the side, away from the other pipe fitting, of one pipe fitting, a guide wire is installed in the interventional assembly, and the two pipe fittings are in threaded connection; according to the scheme, through the core mechanism of double-pipe-fitting threaded connection of the fixed part and the movable part and in combination with the holding and positioning functions of the flanges, a catheter length adaptation system capable of being adjusted in real time is constructed, the threaded protruding strips on the inner wall of the fixed part are precisely meshed with the threaded grooves in the surface of the movable part, and an operator only needs to rotate the flanges of the movable part or the fixed part in vitro; by means of the structural design, length adjustment of the catheter does not need to depend on in-vitro installation before an operation, when length mismatching is found in the operation, the catheter does not need to be pulled out for re-operation, and adjustment can be completed by directly rotating the flange in vitro.

Description

Technical Field

[0001] This invention relates to the field of angiography catheter technology, specifically to an extendable angiography catheter and interventional catheter assembly. Background Technology

[0002] Angiography catheters are crucial medical devices in interventional diagnosis and treatment. They are mainly used in vascular interventional procedures to precisely deliver catheters to target blood vessels or the heart, providing a pathway for subsequent angiography, drug delivery, and device implantation. They help doctors clearly understand vascular lesions, cardiac structure and function, and are an indispensable tool in the diagnosis and treatment of cardiovascular diseases.

[0003] In the existing technology, although extendable angiography catheters have been designed in an attempt to solve the problem of incompatibility of fixed-size catheters due to differences in human body, there are still obvious defects.

[0004] First, these types of extendable angiography catheters usually need to be installed and adjusted outside the human body in advance to determine their approximate length.

[0005] However, the human vascular system is extremely complex and varies significantly from person to person. Even with a certain assessment before surgery, the catheter length may still not match the actual needs during the procedure.

[0006] If, during surgery, it is found that the catheter is not long enough to reach the target position, the catheter already inserted into the patient's body needs to be removed and readjusted.

[0007] This process not only interrupts the surgical procedure, prolongs the operation time, and increases the surgical risk, but more importantly, the repeated insertion and withdrawal of the catheter will cause additional stimulation and damage to the patient's blood vessels, causing the patient to suffer obvious pain, and may even lead to complications such as vasospasm and intimal damage, affecting the surgical outcome and the patient's postoperative recovery.

[0008] In addition, reinstallation may require replacement of catheters or related components, increasing medical costs and creating more trouble and uncertainty for medical staff, thus reducing the efficiency and safety of the surgery.

[0009] Therefore, the present invention proposes an extendable angiography catheter and interventional catheter assembly. Summary of the Invention

[0010] The purpose of this invention is to provide an extendable angiography catheter and interventional catheter assembly to solve the problems mentioned in the background art.

[0011] To achieve the above objectives, the present invention provides the following technical solution: an extendable angiography catheter and interventional catheter assembly, including an interventional assembly, the interventional assembly consisting of two tubing components, one of which has a flexible part installed on the side away from the other tubing component, a guide wire installed inside the interventional assembly, the two tubing components being threadedly connected, and each of the tubing components having a flange installed on the side away from the flexible part.

[0012] Preferably, the smaller diameter pipe fitting is a movable part one, and the other is a fixed part one, with the fixed part being sleeved onto the outside of the movable part one.

[0013] Preferably, the inner wall of the fixed part is fixedly connected with a threaded protrusion, and the inner surface of the movable part is provided with a threaded groove, so that the threaded protrusion and the threaded groove can achieve threaded engagement.

[0014] Preferably, the threaded protrusion is located at the end of the fixing part.

[0015] Preferably, the smaller diameter pipe fitting is the second movable part, and the other is the second fixed part, which is sleeved on the outside of the second movable part.

[0016] Preferably, the inner wall of the fixed part two is fixedly connected with a threaded protrusion two, and the outer wall of the movable part two is provided with a threaded groove two, and the threaded groove two and the threaded protrusion two achieve threaded engagement.

[0017] Preferably, the second threaded groove is located at the end of the second movable part.

[0018] Preferably, a bellows is installed between the two flanges.

[0019] Preferably, the outer surface of the movable part is provided with a movable scale, and the outer surface of the fixed part is provided with a reference scale. The movable scale and the reference scale are made of fluorescent material. The reference scale is a high-light scale that can be observed by a digital subtraction angiography (DSA) machine. All the tubes are made of transparent medical material.

[0020] Preferably, the outer surface of the movable part two is provided with a movable scale two, and the outer surface of the fixed part two is provided with a reference scale two. The movable scale two and the reference scale two are made of fluorescent material. The reference scale two is a high-light scale that can be observed by a digital subtraction angiography (DSA) machine. All the tubes are made of transparent medical material.

[0021] Preferably, all the tubing is made of transparent medical-grade polycarbonate (PC) or modified polyetheretherketone (PEEK), which combines light transmittance with the bending strength required for vascular intervention.

[0022] Preferably, the fluorescent material is a medical DSA-specific fluorescent ink, and its emission wavelength matches the detection wavelength of the DSA device (e.g., 500-600nm).

[0023] Compared with the prior art, the beneficial effects of the present invention are: 1. This solution utilizes a core mechanism of "dual-pipe threaded connection between the fixed and movable parts," combined with the gripping and positioning function of the flange, to construct a real-time adjustable catheter length adaptation system. The threaded protrusions on the inner wall of the fixed part precisely engage with the threaded grooves on the surface of the movable part. The operator only needs to rotate the flange of the movable or fixed part externally to generate a stable axial driving force through threaded transmission, enabling the tube to advance or retract within the body. This structural design eliminates the need for preoperative external installation for catheter length adjustment. If a length mismatch is found during the procedure, there is no need to remove the catheter and repeat the operation; adjustment can be completed simply by rotating the flange externally. This not only significantly shortens surgical interruption time but also avoids damage to the vascular endothelium caused by repeated insertion and removal of traditional catheters, significantly improving surgical efficiency and patient safety. It effectively solves the core pain point of existing extendable catheters, which require "preoperative installation and intraoperative adjustment, requiring a second operation."

[0024] 2. To address the high risk of vascular injury during interventional procedures, this solution employs a differentiated structural design where the diameter of the movable part is smaller than that of the fixed part. Combined with the functional division of "external retention of the fixed part / internal support," a low-friction vascular contact system is constructed. In Example 1, the smaller-diameter movable part serves as the primary internal contact component. Its smaller outer wall area significantly reduces the friction range and coefficient with the vessel wall, lowering the probability of vascular spasm and intimal injury. In Example 2, the larger-diameter fixed part remains in the body to provide stable support, while the smaller-diameter movable part is only adjusted externally and does not contact the vessel wall at all. This design, by optimizing the component diameter and functional division, minimizes the risk of vascular injury. Compared to the existing catheter structure of "single diameter, full-process contact with the vessel," it further enhances the low-trauma advantage and is more suitable for the long-term interventional procedures in complex vascular environments.

[0025] 3. This solution adds a bellows between the flanges of the two fittings and adopts an installation method of "rotating at one end and fixed at the other." This allows the bellows to simultaneously provide damping feedback and sealing protection. During adjustment, the compression or stretching of the bellows generates a stable damping force, providing clear tactile feedback to the operator, helping to accurately control the movement distance of the components and avoiding overfeeding due to excessively rapid operation. Simultaneously, the flexible structure of the bellows fills the gap between the two fittings, preventing contrast agent leakage that could affect the accuracy of angiography and blocking external contaminants from entering the catheter and damaging the guidewire. This integrated "damping + sealing" design solves the problems of existing extendable catheters, such as "lack of feedback during adjustment and easy leakage in the gap," making length adjustment more precise and surgical operations more reliable. It is particularly suitable for angiography scenarios with extremely high sealing requirements.

[0026] 4. This solution utilizes a combination of transparent tubing and DSA-specific fluorescent scales to create a visualized and precise adjustment monitoring system. The tubing is made of medical-grade PC or modified PEEK material, which combines light transmittance and bending resistance, providing excellent conditions for DSA radiation penetration. The scale uses fluorescent ink with emission wavelengths matching the DSA detection wavelength, and the reference scale is designed with a high-brightness imaging structure. During the procedure, medical personnel can directly observe the scale displacement through the transparent tubing and also see the high-brightness imaging of the fluorescent scale through the DSA image. This dual monitoring ensures that the displacement reading is not obstructed by the surgical field of view or interfered with by ambient light. Compared with existing catheters that are "without scales or have blurred scale imaging," this design minimizes length adjustment errors, provides precise data support for lesion localization and instrument connection, and effectively avoids poor surgical outcomes caused by adjustment errors.

[0027] 5. This solution, through the differentiated design of two embodiments, forms a complementary functional system of "in vivo length adjustment + external operating space adaptation". Embodiment 1 focuses on the dynamic adjustment of the effective length of the catheter in vivo during the operation, solving the problem of insufficient or excessive length caused by changes in lesion location. Embodiment 2 addresses the need for instrument connection at the back end of the catheter by adjusting and optimizing the operating space at the back end through the external movable part, avoiding the risk of cramped space or collision during instrument connection. The two embodiments share core structures such as threaded fit and flange positioning, but are adapted to the two key stages of "front end lesion docking" and "back end instrument operation" in the operation, respectively. Compared with the shortcomings of existing extendable catheters that are "single-function and have limited adaptability", this solution achieves length adjustment coverage throughout the entire surgical cycle, allowing the catheter to flexibly respond to the changing needs of different surgical stages, and improving the versatility and clinical adaptability of the equipment.

[0028] 6. This solution prioritizes cost control and resource optimization in its structural design. Through a design approach of "universal core components + modular expansion," it reduces production and usage costs. The core double-pipe threaded fit and flange structure are universal across all embodiments; only adjustments to parameters such as component diameter and scale position are needed to adapt to different scenarios. This reduces mold development and the variety of parts, lowering manufacturing costs. Furthermore, functional modules such as corrugated tubes and fluorescent scales can be selectively added according to surgical needs, avoiding unnecessary cost investments. At the user end, real-time intraoperative adjustments eliminate the need to replace the catheter, reducing consumable waste. Precise adjustment and low-invasive design reduce postoperative complication treatment costs and equipment damage due to surgical errors. Compared to existing extendable catheters that are "highly customized and wasteful of consumables," this solution optimizes costs throughout the entire process from production to use, better meeting the cost-effectiveness requirements of medical institutions, and is particularly beneficial for promotion and application in primary healthcare units. Attached Figure Description

[0029] Figure 1 This is a front view of the main structure in Embodiment 1 of the present invention; Figure 2 This is a partial sectional disassembly plan view of the main structure in Embodiment 1 of the present invention; Figure 3 This is a front view of the main structure in Embodiment 2 of the present invention; Figure 4 This is a cross-sectional disassembly plan view of the main structure in Embodiment 2 of the present invention; Figure 5 This is a planar schematic diagram showing the positional relationship of the bellows in this invention; Figure 6 This is a partial planar view of the main structure in Embodiment 4 of the present invention. Figure 7 This is a schematic plan view of the main structure in Embodiment 3 of the present invention; Figure 8 This is a planar disassembly diagram of the main structure in Embodiment 4 of the present invention.

[0030] In the picture: 1. Intervention components; 11. Guide wire; 12. Fittings; 13. Flexible part; 14. Flange; 121A. Fixed part one; 1211A. Internal threaded protrusion one; 122A. Movable part one; 1221A. Threaded groove one; 121B. Fixed part one; 1211B. Threaded protrusion one; 122B. Movable part two; 1221B. Threaded groove two; 2. Bellows; 31A. Reference scale one; 32A. Moving scale one; 31B. Moving scale two; 32B. Reference scale two. Detailed Implementation

[0031] 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 protection scope of the present invention.

[0032] Example 1, please refer to Figure 1 and Figure 2 As shown, the extendable angiography catheter and interventional catheter assembly includes an interventional assembly 1, which consists of two fittings 12. One fitting 12 has a flexible part 13 installed on the side away from the other fitting 12. A guide wire 11 is installed inside the interventional assembly 1. The two fittings 12 are threaded together, and each fitting 12 has a flange 14 installed on the side away from the flexible part 13.

[0033] It should be noted that the smaller diameter pipe fitting 12 is the movable part 122A, and the other is the fixed part 121A. The fixed part 121A is sleeved on the outside of the movable part 122A. The inner wall of the fixed part 121A is fixedly connected with a threaded protrusion 1211A. The inner surface of the movable part 122A is provided with a threaded groove 1221A. The threaded engagement is achieved through the threaded protrusion 1211A and the threaded groove 1221A. The threaded protrusion 1211A is located at the end of the fixed part 121A.

[0034] Specifically, when using this extendable angiography catheter and interventional catheter assembly, the movable part 122A connected to the soft part 13 is first inserted into the patient's body, leaving the fixed part 121A and its outer flange 14 and other structures outside the patient's body. At this time, the guidewire 11 is inside the interventional assembly 1, and with its own rigidity and guidance, it provides stable guidance for the precise positioning of the catheter 12 in the blood vessel, ensuring the accuracy of the initial insertion direction of the catheter 12.

[0035] During the procedure, medical staff used a digital subtraction angiography (DSA) machine for real-time image monitoring. DSA can clearly show the shape of the blood vessels and the position of the tube 12 in the blood vessels. When the DSA image shows that the length of the tube 12 is insufficient to reach the lesion, it is necessary to extend the length of the tube 12.

[0036] At this time, the operator uses the structure on the fixed part 121A that remains outside the body (such as the gripping position around the flange 14) to keep the fixed part 121A stable and still, and then rotates the flange 14 on the movable part 122A.

[0037] Because the inner wall of the fixed part 121A is provided with a threaded protrusion 1211A and the inner surface of the movable part 122A is provided with a threaded groove 1221A, this threaded mating structure is precisely designed and the thread engagement is tight, which can generate a stable and continuous axial driving force during rotation.

[0038] With the threaded engagement of the threaded protrusion 1211A and the threaded groove 1221A, the movable part 122A will smoothly and accurately advance into the patient's body along the axial direction of the fixed part 121A, thereby increasing the effective length of the tube 12 in the patient's body and allowing the end of the movable part 122A connected to the soft part 13 to be closer to the lesion area, creating favorable conditions for subsequent imaging and other operations.

[0039] When the catheter is too long and needs to be shortened, simply rotate the flange 14 on the movable part 122A in the opposite direction. The movable part 122A will then be smoothly retracted towards the outside of the patient under the reverse drive of the threaded engagement, reducing the length of the tube 12 inside the body and flexibly adapting to different surgical needs.

[0040] It should be noted that the design of the fixed part 121A being sleeved on the outside of the movable part 122A makes the movable part 122A the main part in contact with the patient's blood vessels. Moreover, the diameter of the movable part 122A is smaller than that of the fixed part 121A. The smaller diameter means that the contact area with the blood vessel wall is greatly reduced, which in turn significantly reduces the friction range and friction coefficient between the fitting 12 and the blood vessel wall, greatly reducing the risk of damage to the vascular endothelium and truly achieving low-invasive intervention.

[0041] Meanwhile, this design, which allows for real-time adjustment of the tube 12 length during the procedure, eliminates the need to replace the tube 12, avoiding additional harm to the patient from multiple operations and further demonstrating the advantages of low-invasiveness.

[0042] In addition, the tight fit between the threaded protrusion 1211A and the threaded groove 1221A ensures that the movable part 122A is firmly connected during adjustment and will not easily loosen or rotate unexpectedly, thus ensuring the stability and safety of the surgical operation. This embodiment is specifically designed to meet the needs of interventional surgery with low damage and high operational stability.

[0043] Example 2, please refer to Figure 3 and Figure 4 As shown, the smaller diameter pipe fitting 12 is the movable part 122B, and the other is the fixed part 121B. The fixed part 121B is sleeved on the outside of the movable part 122B.

[0044] It should be noted that the inner wall of the fixed part 121B is fixedly connected with a threaded protrusion 1211B, and the outer wall of the movable part 122B is provided with a threaded groove 1221B. The threaded groove 1221B and the threaded protrusion 1211B are threaded together, and the threaded groove 1221B is located at the end of the movable part 122B.

[0045] Specifically, when using this component, the first part of the fixed part 121B connected to the soft part 13 is inserted into the patient's body, so that the soft part 13 at its front end is close to the lesion area, while the movable part 122B remains outside the patient's body as the rear end structure. At this time, the guide wire 11 runs through the entire interventional component 1, providing precise guidance for the initial positioning of the fixed part 121B. Since the fixed part 121B has a large diameter and is already stably placed in the blood vessel, its outer wall forms a close fit and support with the blood vessel wall, ensuring that the front end position is not easily displaced.

[0046] During the procedure, when it is necessary to perform operations at the rear end of the tube 12 (such as connecting contrast agent injection devices, monitoring instruments, etc.), if it is found that the movable part 122B at the rear end extends too far, resulting in a cramped operating space or easy interference from external collisions, medical personnel can use DSA to confirm the stable position of the fixed part 121B in the body in real time, keep the fixed part 121B still, and rotate the flange 14 on the movable part 122B.

[0047] At this time, the threaded groove 1221B on the outer wall of the movable part 2 122B and the threaded protrusion 1211B on the inner wall of the fixed part 2 121B engage and drive each other. The movable part 2 122B, which has a smaller diameter, will move smoothly along the axial direction towards the outside of the patient, thereby shortening the exposed length of the rear end and leaving a suitable space for the connection of the device.

[0048] If it is necessary to extend the length of the rear end in the future (such as replacing with a longer connecting tube), simply rotate the flange 14 of the movable part 2 122B in the opposite direction. The movable part 2 122B will then extend further outward to meet the connection requirements of different instruments.

[0049] It should be noted that the core design of Embodiment 2 is to use the larger diameter fixed part 2 121B as an internal support structure, while the smaller diameter movable part 2 122B is only adjusted externally.

[0050] The advantages of this design are: the movable part 122B is always outside the body and will not come into contact with the blood vessel wall during the adjustment process, thus avoiding frictional damage to the blood vessel caused by the movement of the parts; while the fixed part 121B has a larger diameter and can provide more stable radial support, reducing the shaking of the tube 12 inside the body, which is especially suitable for surgical scenarios that require maintaining the position of the front end for a long time.

[0051] Meanwhile, the threaded fit structure ensures that the movable part 122B can be tightly locked after adjustment, and will not loosen due to external touch, thus ensuring the stability of the connection of the rear instrument.

[0052] Unlike Example 1, which focuses on in vivo length adjustment, Example 2 is specifically designed for flexible adaptation of the operating space at the back end of the catheter. Through the logic of "in vivo fixation and external adjustment", it avoids secondary damage to blood vessels and provides convenience for the operation of back-end instruments. The two examples complement each other and cover the length adjustment needs at different stages of interventional surgery.

[0053] Example 3, please refer to as follows Figure 5 and Figure 7 As shown, a bellows 2 is installed between the two flanges 14. The bellows 2 can be installed with one end rotated and the other end fixed.

[0054] Specifically, based on Embodiment 1, when it is necessary to extend the length of the tube 12 inside the patient's body, the operator rotates the flange 14 on the movable part 122A to move the movable part 122A towards the patient's body.

[0055] At this time, the bellows 2 connected between the two flanges 14 will be compressed as the movable part 122A moves.

[0056] During the compression process, the bellows 2 will generate a certain damping force. This damping force can provide clear feedback to the operator, making it easier for the operator to perceive the movement status of the movable part 122A. This effectively prevents the movable part 122A from being fed too much due to excessive operation or excessive force, thereby accurately controlling the extension length of the pipe fitting 12 inside the body.

[0057] Meanwhile, the bellows 2 itself has good sealing performance, which can fill the gap between the fixed part-121A and the movable part-122A, preventing contrast agents and other liquids from leaking out of the gap, ensuring the accuracy of angiography and other operations during the operation. Moreover, the flexible structure of the bellows 2 can also buffer the movement of the movable part-122A when compressed, further reducing the impact on blood vessels caused by component movement and enhancing the effect of low-invasive intervention.

[0058] Based on Embodiment 2, when it is necessary to shorten the exposed length of the rear end of the tube 12, the flange 14 on the movable part 2 122B is rotated, and the movable part 2 122B moves towards the outside of the patient's body. At this time, the corrugated tube 2 will be stretched.

[0059] The tension generated by the bellows 2 during the stretching process provides operational feedback to the operator, facilitating precise control of the movement distance of the movable part 122B. On the other hand, the bellows 2 in the stretched state can traction and limit the movable part 122B, ensuring that the movable part 122B remains coaxial with the fixed part 121B during movement, avoiding deviation, shaking, etc., thereby ensuring the stability and accuracy of the connection of the rear-end instrument.

[0060] In addition, the sealing performance of the bellows 2 can also play a role in this scenario, preventing external contaminants from entering the interior of the tube 12 through the gaps between components, protecting the internal structure such as the guide wire 11, and also preventing the leakage of contrast agents and other substances inside the tube 12, thereby improving the reliability and safety of the entire interventional assembly 1.

[0061] Example 4, please refer to as follows Figures 5 to 8 As shown, a movable scale 32A is provided on the outer surface of the movable part 122A, and a reference scale 31A is provided on the outer surface of the fixed part 121A. The movable scale 32A and the reference scale 31A are made of fluorescent material, and the reference scale 31A is a high-light scale that can be observed by a digital subtraction angiography (DSA) machine. All tubes 12 are made of transparent medical material. The outer surface of the movable part 122B is provided with a movable scale 32B, and the outer surface of the fixed part 121B is provided with a reference scale 31B. The movable scale 32B and the reference scale 31B are made of fluorescent material, and the reference scale 31B is a high-light scale that can be observed by a digital subtraction angiography (DSA) machine. All tubes 12 are made of transparent medical material.

[0062] It should be noted that all fittings 12 are made of transparent medical-grade polycarbonate (PC) or modified polyether ether ketone (PEEK), which combines light transmittance with the bending strength required for vascular intervention. The fluorescent material is medical-grade DSA-specific fluorescent ink, and its emission wavelength matches the detection wavelength of the DSA equipment, such as 500-600nm.

[0063] Specifically, based on Example 1, please refer to the following: Figure 5 and Figure 6 As shown, in the initial state, the moving scale 32A is aligned with the reference scale 31A, providing an initial reference for adjusting the length of the pipe fitting 12.

[0064] During use, when it is necessary to extend the length of the tube 12 inside the patient's body, the operator rotates the flange 14 on the movable part 122A, causing the movable part 122A to move towards the patient's body. Since the tubes 12 are all made of transparent medical-grade polycarbonate (PC) or modified polyetheretherketone (PEEK), they combine light transmittance with the bending strength required for vascular intervention. This transparency provides good conditions for the X-ray penetration of the DSA equipment, allowing the DSA to clearly capture the scale information inside and on the surface of the tube 12.

[0065] Meanwhile, the movable scale 32A and the reference scale 31A are made of medical DSA-specific fluorescent ink, and their emission wavelengths match the detection wavelengths of DSA equipment (such as 500-600nm). When medical personnel use DSA equipment for real-time image monitoring, these fluorescent scales can be highlighted in the DSA images.

[0066] The advantages of this design are significant: Firstly, the transparent tube 12 allows DSA rays to penetrate more easily. Combined with the high-brightness imaging of fluorescent ink, medical personnel can accurately read the displacement of the moving scale 32A relative to the reference scale 31A through DSA images, even when the catheter is deeply inserted into the body and the surgical field is limited. This greatly reduces adjustment errors caused by visual obstruction or complex operation, making the adjustment of the tube 12 length more precise. Secondly, the fluorescent scale is imaged at a specific wavelength under DSA, ensuring that the reading of scale information is not affected by factors such as ambient light or human tissue obstruction. This further improves the accuracy and stability of the adjustment, laying a solid foundation for the precision of subsequent angiography and other operations, and effectively avoiding the adverse effects of tube 12 length adjustment errors on the surgical outcome.

[0067] Based on Example 2, please refer to the following: Figure 7 and Figure 8 As shown, initially, the moving scale 32B is aligned with the reference scale 31B, serving as the initial reference for adjusting the length of the rear end of the pipe fitting 12.

[0068] When it is necessary to shorten the exposed length of the rear end of the fitting 12, the operator rotates the flange 14 on the movable part 122B to move the movable part 122B toward the outside of the patient.

[0069] Similarly, thanks to the transparent medical-grade polycarbonate (PC) or modified polyether ether ketone (PEEK) material used in the fitting 12, its excellent light transmittance facilitates the penetration of DSA rays. The DSA equipment can clearly capture the scale changes on the fitting 12. Furthermore, the medical-grade DSA-specific fluorescent ink used in the moving scale 32B and the reference scale 31B can be clearly visualized under the DSA equipment according to the matched detection wavelength (such as 500-600nm). Medical personnel can accurately and in real time grasp the displacement of the moving part 122B through DSA images.

[0070] This design offers several advantages: First, the transparent tube 12, combined with the X-ray penetration and fluorescence imaging of DSA, allows operators to strictly control the movement distance of the movable part 122B through DSA images, even when the rear operating space is cramped or the operator's hand or instruments partially obstruct the field of vision. This avoids excessive or insufficient adjustment of the rear length and ensures that just the right amount of space is reserved for the connection of rear instruments.

[0071] Secondly, the precise development of the fluorescence scale under DSA ensures that the scale information is always accurately read when connecting instruments (such as contrast agent injection devices, monitoring instruments, etc.) to the rear end of tube 12, thus guaranteeing the continuity and stability of the operation.

[0072] Finally, accurate adjustment of the rear end length allows for a tighter and more stable connection between the rear end of fitting 12 and external instruments, reducing the risk of contrast agent leakage and instrument loosening caused by improper connection, and further improving the safety and reliability of interventional surgery.

[0073] 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0074] 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. An extendable angiography catheter and interventional catheter assembly, comprising an interventional assembly (1), said interventional assembly (1) consisting of two fittings (12), one of said fittings (12) having a flexible part (13) installed on the side away from the other fitting (12), said interventional assembly (1) having a guidewire (11) installed inside, characterized in that: The two pipe fittings (12) are threaded together, and each pipe fitting (12) has a flange (14) installed on the side away from the soft part (13).

2. The extendable angiography catheter and interventional catheter assembly according to claim 1, characterized in that: The smaller diameter pipe fitting (12) is a movable part (122A) and a fixed part (121A), which is sleeved on the outside of the movable part (122A).

3. The extendable angiography catheter and interventional catheter assembly according to claim 2, characterized in that: The inner wall of the fixed part (121A) is fixedly connected with a threaded protrusion (1211A), and the inner surface of the movable part (122A) is provided with a threaded groove (1221A). The threaded engagement is achieved through the threaded protrusion (1211A) and the threaded groove (1221A).

4. The extendable angiography catheter and interventional catheter assembly according to claim 3, characterized in that: The threaded protrusion (1211A) is located at the end of the fixing part (121A).

5. The extendable angiography catheter and interventional catheter assembly according to claim 1, characterized in that: The smaller diameter pipe fitting (12) is a movable part two (122B), and the other is a fixed part two (121B). The fixed part two (121B) is sleeved on the outside of the movable part two (122B).

6. The extendable angiography catheter and interventional catheter assembly according to claim 5, characterized in that: The inner wall of the fixed part 2 (121B) is fixedly connected with a threaded protrusion 2 (1211B), and the outer wall of the movable part 2 (122B) is provided with a threaded groove 2 (1221B). The threaded groove 2 (1221B) and the threaded protrusion 2 (1211B) achieve threaded engagement.

7. The extendable angiography catheter and interventional catheter assembly according to claim 6, characterized in that: The second threaded groove (1221B) is located at the end of the second movable part (122B).

8. The extendable angiography catheter and interventional catheter assembly according to any one of claims 4 or 7, characterized in that: A bellows (2) is installed between the two flanges (14).

9. The extendable angiography catheter and interventional catheter assembly according to claim 4, characterized in that: The outer surface of the movable part (122A) is provided with a movable scale (32A), and the outer surface of the fixed part (121A) is provided with a reference scale (31A). The movable scale (32A) and the reference scale (31A) are made of fluorescent material. The reference scale (31A) is a high-light scale that can be observed by a digital subtraction angiography (DSA) machine. All the tubes (12) are made of transparent medical material.

10. The extendable angiography catheter and interventional catheter assembly according to claim 7, characterized in that: The outer surface of the movable part 2 (122B) is provided with a movable scale 2 (32B), and the outer surface of the fixed part 2 (121B) is provided with a reference scale 2 (31B). The movable scale 2 (32B) and the reference scale 2 (31B) are made of fluorescent material. The reference scale 2 (31B) is a high-gloss scale that can be observed by a digital subtraction angiography (DSA) machine. All the tubes (12) are made of transparent medical material.

Images