Cardiovascular surgery catheter and its fixing mechanism

Abstract

This invention relates to the field of surgical catheter technology and discloses a cardiovascular and cerebrovascular surgical catheter and its fixation mechanism, including a fixation shell and a catheter body. The bottom of the fixation shell is provided with an adhesive layer for fixing to the patient's skin. Two sets of symmetrical three-point fixation components are provided inside the fixation shell. Each three-point fixation component includes a fixation rod slidably connected to the center of the fixation shell. Clamps are symmetrically hinged inside the fixation shell and on both sides of the fixation rod. The bottom of the clamps is slidably connected to the side wall of the fixation rod. The clamping portions of the fixation rod and the clamps extend to the outside of the fixation shell. Through the semi-open local avoidance area structure, the dual-mode adaptation of lateral non-penetration installation of the catheter body and traditional axial insertion is realized. This effectively improves the problem that existing devices only support axial insertion and cannot be directly fixed after the catheter is connected to the device. It helps to improve the adaptability of the device in different surgical scenarios and reduce the risk of catheter disassembly and contamination.

Description

Technical Field

[0001] This invention relates to the field of surgical catheter technology, specifically to a cardiovascular and cerebrovascular surgical catheter and its fixation mechanism. Background Technology

[0002] Interventional cardiovascular surgery is an important minimally invasive procedure for treating cerebrovascular diseases. During the procedure, an interventional catheter is inserted into the target blood vessel through puncture sites such as the femoral artery or radial artery to perform procedures such as angiography, thrombolysis, or stent implantation. To prevent the catheter from shifting or rotating during the procedure due to slight patient movement, instrument traction, or blood flow impact, which could affect surgical precision or even cause vascular damage, stable and reliable intraoperative fixation of the catheter is necessary.

[0003] Most commonly used catheter fixation devices in clinical practice adopt an axial insertion one-piece structure, meaning the catheter needs to be inserted into one end of the device and exited from the other end, and then fixed by a balloon or two-point clamping structure. These devices can be used normally when the catheter tip is not connected to equipment such as an angiography machine or syringe, but when the catheter is connected to related equipment, the fixation device cannot be directly inserted from the side. The equipment must be removed and the catheter re-inserted, which is not only cumbersome and time-consuming, but also easy to cause catheter contamination and increase the risk of infection. At the same time, balloon clamping is prone to slippage and eccentricity due to air pressure fluctuations, while two-point rigid clamping is prone to clamping the catheter off-center, causing local stress concentration, causing indentation or even damage to thin-walled interventional catheters, seriously affecting the safety of the operation.

[0004] Existing catheter fixation devices also have significant shortcomings in wound care and observation. Their bases are often directly attached to the area around the puncture wound, completely obscuring it. Medical staff cannot directly observe the bleeding or drainage from the wound. If sudden bleeding or increased drainage occurs, the device must be temporarily removed for treatment. This process can easily lead to catheter displacement, increasing surgical risks.

[0005] In addition, most of these devices adopt a concentric design, with the clamping structure located directly above the wound, which directly compresses the wound and can easily irritate the wound, aggravate patient discomfort, and even affect wound healing. The contact area between the device and the skin is limited, and the fixation stability is poor. When the patient moves slightly or the catheter is pulled during surgical operations, it is easy to loosen or shift, and cannot provide continuous and reliable catheter fixation for cardiovascular and cerebrovascular interventional surgery.

[0006] At the same time, these devices do not provide space for dressings or hemostatic cotton. If the dressing needs to be changed during the operation, the entire device must be removed, which further increases the risk of catheter displacement and infection. This makes it difficult to meet the high safety requirements of clinical surgery for catheter fixation in multiple scenarios.

[0007] Therefore, the present invention proposes a cardiovascular and cerebrovascular surgical catheter and its fixation mechanism. Summary of the Invention

[0008] The purpose of this invention is to provide a cardiovascular and cerebrovascular surgical catheter and its fixation mechanism to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a cardiovascular and cerebrovascular surgical catheter and its fixation mechanism, comprising a fixation shell and a catheter body. An adhesive layer is provided at the bottom of the fixation shell for fixing to the patient's skin. Two sets of symmetrical three-point fixation components are provided within the fixation shell. Each three-point fixation component includes a fixation rod slidably connected to the center of the fixation shell. Clamping jaws are symmetrically hinged within the fixation shell on both sides of the fixation rod. The bottom of each clamping jaw is slidably connected to the side wall of the fixation rod. The clamping portions of both the fixation rod and the clamping jaws extend to the outside of the fixation shell, forming a semi-open local clearance area for the catheter body to pass through. When the fixation rod moves outward, it pushes the clamping jaws on both sides to rotate inward synchronously, cooperating with the center of the fixation rod to form a three-point clamping structure, thereby clamping and fixing the catheter body.

[0010] Preferably, the fixing rod body has a cross-shaped structure with four arms extending in all directions. The two arms that cooperate with the gripper are outwardly extending support arms. The surface of the support arm is provided with an inclined guide surface. The bottom of the gripper can slide along the inclined surface. When the fixing rod body moves outward, the inclined surface pushes the gripper to rotate inward synchronously through the lateral component force.

[0011] Preferably, the upper and lower ends of the gripper are hinged with side wheels, the central clamping section of the fixed rod is hinged with a central wheel, the central wheel and the side wheel at the upper end of the gripper together form a three-point clamping structure for clamping the guide tube body, and the side wheel at the lower end of the gripper slides on the inclined guide surface of the fixed rod to transmit lateral force to drive the gripper to rotate.

[0012] Preferably, the interior of the fixed housing is symmetrically fixedly connected with a hinge shaft, and an auxiliary drive plate is hinged to each hinge shaft. The auxiliary drive plate is in transmission cooperation with the fixed rod and the gripper. When the fixed rod moves, it drives the auxiliary drive plate to swing around the hinge shaft as the center, thereby driving the gripper to rotate.

[0013] Preferably, the surface of the auxiliary drive plate is provided with an arc-shaped groove and a straight groove, a limiting shaft one is fixedly connected to the surface of the fixed rod, and a limiting shaft two is fixedly connected to the surface of the gripper. The limiting shaft one is slidably engaged with the arc-shaped groove, and the limiting shaft two is slidably engaged with the straight groove.

[0014] Preferably, the arc-shaped groove is a groove-shaped structure with one end away from the center of the fixed rod and the other end close to the center of the fixed rod, used to drive the auxiliary drive plate to swing when the fixed rod moves axially, through cooperation with the limiting shaft.

[0015] Preferably, a second hinge shaft is fixedly connected to the surface of the gripper, and the second hinge shaft is hinged to the fixed housing.

[0016] Preferably, the rear end of the fixed housing is provided with a push-lock mechanism, which is used to drive the fixed rod to move and lock its position.

[0017] Preferably, the propulsion locking mechanism includes a rotating seat fixedly connected to the rear end of the fixed housing. The fixed rod body has an internal thread, and a bolt is rotatably installed in the rotating seat. The bolt is threadedly connected to the internal thread. When the bolt is rotated, it can drive the fixed rod body to move back and forth and achieve self-locking.

[0018] Preferably, the bottom of the fixed housing is fixedly connected to an elevation frame, the adhesive layer is installed at the bottom of the elevation frame, the elevation frame is a frame structure that is not completely closed and extends to the insertion position of the catheter body, and the elevation frame is a hollow structure that can hold dressings or hemostatic cotton.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. Through a semi-open partial avoidance area structure, the device achieves dual-mode compatibility between lateral non-penetration installation of the catheter body and traditional axial insertion. This effectively improves the problem that existing devices only support axial insertion and cannot be directly fixed after the catheter is connected to the equipment. This helps to improve the adaptability of the device in different surgical scenarios, reduce the risk of catheter disassembly and contamination. In cardiovascular and cerebrovascular interventional surgery, the catheter often needs to be connected to equipment such as angiography machines and syringes in advance. Traditional axial insertion devices require disassembly of the equipment before installation, which is not only time-consuming but also prone to infection. The semi-open structure of this device allows the catheter to be directly inserted from the side without disassembly of the equipment, greatly simplifying the intraoperative operation process. Medical staff can complete the catheter fixation without additional operations, providing greater flexibility for intraoperative operations, while reducing the risk of catheter contamination and displacement, and better adapting to the diverse surgical needs in clinical practice.

[0020] 2. The three-point symmetrical rigid clamping structure achieves automatic centering and anti-rotation fixation of the catheter, effectively improving the shortcomings of balloon clamping (prone to slippage and eccentricity) and two-point clamping (prone to misalignment). This helps improve the coaxiality and stability of catheter fixation. Existing balloon-type catheter fixation devices often experience slippage and eccentricity due to air pressure fluctuations, while two-point rigid clamping is prone to misalignment due to uneven force, causing local stress concentration and damage to thin-walled catheters. The three-point symmetrical rigid clamping structure of this device can automatically center and position the catheter, ensuring that the catheter axis is coaxial with the clamping center. At the same time, the force distribution of the three-point contact is more uniform, significantly reducing the local pressure on the thin-walled interventional catheter, reducing the risk of indentation and catheter wall damage, ensuring the stability and controllability of the catheter posture during the operation, and avoiding the impact of catheter displacement or rotation on surgical precision.

[0021] 3. The linkage drive structure between the fixed rod and the grippers achieves synchronous and balanced clamping action, effectively improving the problems of asynchronous clamping action and unilateral force in existing devices, thus enhancing the stability and reliability of the clamping process. This device utilizes the sliding engagement between the inclined guide surface on the fixed rod and the side wheels of the grippers, combined with the linkage transmission of the auxiliary drive plate, to form a dual drive structure. This ensures that the actions of the grippers on both sides are completely synchronized, avoiding catheter displacement or clamping failure caused by unilateral force. Furthermore, this linkage structure achieves stable transmission without complex additional components, simplifying the overall structure of the device and reducing the failure rate. Medical personnel only need to drive the fixed rod to move it, which will cause the grippers on both sides to close synchronously. The clamping process is smooth and controllable, effectively preventing catheter displacement or damage caused by uneven clamping force, and improving the safety and convenience of the device.

[0022] 4. The threaded locking mechanism enables precise adjustment of clamping force and long-term self-locking, effectively improving the problems of uncontrollable and easily malfunctioning cuff clamping force. This allows medical staff to flexibly adjust the clamping force according to the catheter diameter and material. Existing cuff clamping devices often suffer from inaccurate inflation force control, leading to overpressure damage to the catheter or insufficient clamping causing displacement. This device uses a threaded locking mechanism, allowing medical staff to precisely control the movement distance of the fixing rod by rotating the bolt, thereby adjusting the clamping amplitude to accommodate catheters of different diameters. The threaded joint also has a self-locking characteristic, maintaining a fixed state without the need for additional locking components. It will not loosen even after long-term use, improving the ease of use and long-term stability of the device. This allows medical staff to focus on surgical procedures without frequent adjustments during the operation.

[0023] 5. The exposed clamping components of this device enable unobstructed visualization of the wound area, effectively overcoming the shortcomings of traditional devices where the base obstructs the wound and prevents direct observation of bleeding and exudation. This allows medical staff to monitor the wound's condition in real time. Traditional catheter fixation devices typically have their bases directly attached to the area around the puncture wound, completely obscuring it. Medical staff cannot directly observe bleeding or exudation, and in case of sudden bleeding or increased exudation, the device must be temporarily disassembled for treatment. This process can easily lead to catheter displacement, increasing surgical risks. In contrast, the clamping components of this device extend to the outside of the fixation shell, ensuring the device itself does not directly compress or obstruct the wound. Medical staff can clearly observe the wound's condition throughout the procedure and perform hemostasis and nursing care without disassembling the device, reducing the risk of catheter displacement and infection and ensuring surgical safety.

[0024] 6. The open frame structure of the elevation frame achieves both elevation and support of the main body of the device and provides space for lateral wound care. This effectively improves the problems of circumferential pressure on the wound and inconvenience in dressing changes caused by traditional devices, helping to reduce the risk of pressure sores around the wound. The elevation frame increases the contact area between the device and the patient's skin, dispersing the pressure per unit area and reducing pressure on the local skin. Furthermore, the incompletely enclosed frame structure of the elevation frame creates a reserved space between the clamping mechanism and the wound after the main body of the device is raised. Medical staff can place or change hemostatic dressings from the side without disassembling the device or moving the catheter, simplifying the nursing process during surgery, avoiding direct pressure on the wound, reducing patient discomfort, and improving the convenience and safety of surgical procedures. Attached Figure Description

[0025] Figure 1 This is a partial frontal perspective three-dimensional schematic diagram of the main structure of the present invention; Figure 2 This is a partial top-view perspective view of the main structure of the present invention; Figure 3 This is a cross-sectional plan view of the main structure of the present invention; Figure 4 This is a partial cross-sectional perspective view of the main structure in Embodiment 1 of the present invention; Figure 5 This is a partial exploded perspective view of the main structure in Embodiment 1 of the present invention; Figure 6 This is a partial three-dimensional schematic diagram of the three-point fixing component in the clamping state according to Embodiment 1 of the present invention; Figure 7 For the present invention Figure 1 Enlarged 3D structural diagram at point A; Figure 8 This is a three-dimensional disassembly diagram of the main structure in Embodiment 2 of the present invention; Figure 9 This is a frontal perspective three-dimensional schematic diagram of the main structure in Embodiment 3 of the present invention; Figure 10 This is a top-view perspective view of the main structure in Embodiment 3 of the present invention.

[0026] In the picture: 1. Fixed housing; 11. Adhesive layer; 2. Three-point fixing assembly; 21. Fixed rod; 211. Center wheel; 22. Auxiliary drive plate; 23. Hinge shaft one; 24. Arc groove; 241. Limiting shaft one; 242. Limiting shaft two; 25. Straight groove; 26. Gripper; 261. Hinge shaft two; 262. Side wheel; 3. Guide tube body; 4. Pushing and locking mechanism; 41. Rotating seat; 42. Bolt; 43. Internal thread; 5. Lifting frame. Detailed Implementation

[0027] 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.

[0028] It should be noted that the adhesive layer 11, dressing, and hemostatic cotton described above are all existing technologies. The adhesive layer 11 can be made of biocompatible adhesive materials such as medical pressure-sensitive adhesive or hydrocolloids. It fixes the device to the patient's skin surface by direct adhesion; during use, simply peel off the release film and press to achieve stable fixation. The dressing or hemostatic cotton is a conventional medical consumable and can be placed in the hollow area of ​​the lifting frame 5 for wound hemostasis and care. It can be directly filled into the reserved space during use. Given the versatility of the above structure, its specific principles will not be elaborated further.

[0029] Please see Figures 1 to 4 The present invention provides an embodiment: A cardiovascular and cerebrovascular surgical catheter and its fixation mechanism include a fixation shell 1 and a catheter body 3. The bottom of the fixation shell 1 is provided with an adhesive layer 11 for fixing to the patient's skin. The fixation shell 1 is provided with two sets of symmetrical three-point fixation components 2. The three-point fixation components 2 include a fixation rod 21 slidably connected to the center of the fixation shell 1. The fixation shell 1 is provided with symmetrically hinged claws 26 on both sides of the fixation rod 21. The bottom of the claws 26 is slidably connected to the side wall of the fixation rod 21. The clamping parts of the fixation rod 21 and the claws 26 extend to the outside of the fixation shell 1, forming a semi-open local avoidance area for the catheter body 3 to pass through. When the fixation rod 21 moves outward, it pushes the two claws 26 to rotate inward synchronously, which cooperates with the center of the fixation rod 21 to form a three-point clamping structure to clamp and fix the catheter body 3.

[0030] Please see Figures 3 to 6 The fixed rod 21 has a cross-shaped structure with four arms extending in all directions. The two arms that cooperate with the gripper 26 are outward-extending support arms. The surface of the support arm is provided with an inclined guide surface. The bottom of the gripper 26 can slide along the inclined surface. When the fixed rod 21 moves outward, the inclined surface pushes the gripper 26 to rotate inward synchronously through the lateral component force.

[0031] Please see Figures 5 to 6Both ends of the gripper 26 are hinged with side wheels 262, and the central clamping section of the fixed rod 21 is hinged with a central wheel 211. The central wheel 211 and the side wheel 262 at the upper end of the gripper 26 together form a three-point clamping structure for clamping the conduit body 3. The side wheel 262 at the lower end of the gripper 26 slides on the inclined guide surface of the fixed rod 21 to transmit lateral force to drive the gripper 26 to rotate.

[0032] Please see Figures 3 to 6 The interior of the fixed housing 1 is symmetrically connected with hinge shafts 23. Each hinge shaft 23 is hinged with an auxiliary drive plate 22. The auxiliary drive plate 22 is in transmission cooperation with the fixed rod 21 and the gripper 26. When the fixed rod 21 moves, it drives the auxiliary drive plate 22 to swing around the hinge shaft 23, thereby driving the gripper 26 to rotate. The surface of the auxiliary drive plate 22 is provided with an arc-shaped groove 24 and a straight groove 25. A limiting shaft 241 is fixedly connected to the surface of the fixed rod 21, and a limiting shaft 242 is fixedly connected to the surface of the gripper 26. The limiting shaft 241 and the arc-shaped groove 25 are connected to the fixed rod 21. The slidable groove 24 is slidably engaged with the limiting shaft 242 and the straight groove 25. The arc groove 24 is a groove-shaped structure with one end away from the center of the fixed rod 21 and the other end close to the center of the fixed rod 21. It is used to drive the auxiliary drive plate 22 to swing when the fixed rod 21 moves axially, through the cooperation with the limiting shaft 241. The surface of the gripper 26 is fixedly connected to the hinge shaft 261. The hinge shaft 261 is hinged to the fixed housing 1. The rear end of the fixed housing 1 is provided with a push-lock mechanism 4. The push-lock mechanism 4 is used to drive the fixed rod 21 to move and lock the position.

[0033] It should be noted that the pushing and locking mechanism 4 can be implemented using various existing technologies. For example, a stepper motor with a self-locking function can be used in conjunction with a lead screw drive structure, a cylinder with a one-way check valve, or a push rod assembly. All of these can achieve axial pushing and position locking of the fixed rod 21. Those skilled in the art can select the appropriate driving form according to actual needs, which will not be elaborated here. The adhesive layer 11 at the bottom of the fixed housing 1 can be made of medical pressure-sensitive adhesive, hydrocolloid dressing, or other biocompatible adhesive materials. It can be fixed to the patient's skin surface by direct adhesion, which is firm and does not easily irritate the wound. Alternatively, a peelable adhesive structure with a release film can be selected according to the actual scenario to facilitate temporary fixation of the device. In addition to adjustment, this device achieves centering and anti-rotation fixation of the catheter body 3 through a three-point symmetrical rigid clamping structure. Compared with the balloon clamping or two-point clamping method, the three-point contact can automatically center and position, with higher coaxiality and stability, effectively avoiding clamping slippage, eccentricity or clamping deviation. At the same time, the force distribution of the three-point contact is more uniform, and the pressure on the catheter wall is lower, which greatly reduces the risk of indentation and damage to thin-walled interventional catheters. The semi-open local avoidance area supports both lateral non-penetration installation of the catheter body 3 and is also compatible with the traditional axial insertion method, making it more adaptable to a wider range of scenarios. It avoids the direct obstruction of the wound by the traditional base structure, reserves space for wound observation, and improves the convenience and safety of surgical operations.

[0034] Specifically, in use, the entire device is first attached and fixed to the skin surface around the surgical wound of the patient by means of the adhesive layer 11 at the bottom of the fixed housing 1. The adhesive layer 11 is used to complete the initial positioning of the device and ensure that the device will not shift during subsequent clamping operations.

[0035] Since the clamping area of ​​the fixing rod 21 and the clamping claw 26 extends to the outside of the fixing housing 1, forming a semi-open local clearance space, there are two flexible operation modes when placing the catheter body 3. Medical staff can either insert the catheter body 3 into the clamping area axially from one side according to the conventional operation method, or directly place the catheter into the open area from the side. Even if the front end of the catheter has been connected to the surgical instrument, there is no need to disassemble and reassemble the whole, which greatly simplifies the catheter placement process.

[0036] After the conduit is placed, the push-lock mechanism 4 at the rear end of the fixed housing 1 is activated. This mechanism drives the fixed rod 21 to move smoothly outward. The inclined guide surfaces on the two side arms of the fixed rod 21 slide and cooperate with the side wheels 262 at the lower end of the gripper 26. Using the lateral force generated by the inclined surface, the two grippers 26 are initially pushed to rotate inward synchronously around the hinge axis 261.

[0037] While the fixed rod 21 moves axially, the limiting shaft 241 fixed on its outer wall slides along the arc groove 24 on the surface of the auxiliary drive plate 22, thereby driving the auxiliary drive plate 22 to swing around the hinge shaft 23. The straight groove 25 on the auxiliary drive plate 22 forms a sliding fit with the limiting shaft 242 on the surface of the gripper 26. Relying on this linkage structure, the gripper 26 is further driven to retract inward. The dual transmission structure works together to ensure that the actions of the grippers 26 on both sides are completely synchronized, effectively preventing the problem of unilateral force and misalignment.

[0038] As the fixed rod 21 continues to move outward, the central wheel 211 at the center of the fixed rod 21, together with the side wheels 262 at the upper end of the two side grippers 26, gradually fits against the outer wall of the guide tube body 3, and finally forms a stable three-point clamping structure.

[0039] This clamping method can automatically center and position the catheter, and the force at the contact point is uniform. It can firmly restrict the catheter from sliding and rotating, and will not scratch the thin-walled catheter due to local pressure concentration. Compared with traditional products on the market where the catheter and the fixing structure are arranged concentrically, the core clamping component of this device is exposed on the outside of the fixing shell 1, which will not obstruct the patient's wound. Medical staff can clearly observe the wound condition throughout the process, and can carry out treatment immediately in case of sudden bleeding or other emergencies.

[0040] Meanwhile, the device is only fixed to the skin on the side of the wound, so it will not put full pressure on the wound body, reducing pressure and stimulation on the wound surface.

[0041] Once the clamping mechanism is in place, the locking mechanism 4 enters a self-locking state, locking the position of the fixing rod 21 and ensuring the stability of the entire clamping structure. During subsequent long-term surgical procedures, the catheter body 3 maintains a fixed posture, providing reliable support for cardiovascular and cerebrovascular interventional surgery and comprehensively improving the convenience, safety, and practicality of the surgical procedure.

[0042] Please see Figures 7 to 8 Based on Example 1, Example 2: The push-locking mechanism 4 includes a rotating seat 41 fixedly connected to the rear end of the fixed housing 1. The fixed rod 21 has an internal thread 43 inside. A bolt 42 is rotatably installed inside the rotating seat 41. The bolt 42 is threadedly connected to the internal thread 43. When the bolt 42 is rotated, it can drive the fixed rod 21 to move back and forth and achieve self-locking.

[0043] Specifically, based on Embodiment 1, this embodiment uses a manual threaded push structure as the push locking mechanism 4. Medical staff can directly rotate the bolt 42, and through its cooperation with the internal thread 43 of the fixing rod 21, drive the fixing rod 21 to move smoothly along the axial direction, thereby driving the three-point fixing assembly 2 to complete the clamping action of the catheter.

[0044] The threaded pair of bolt 42 and internal thread 43 has a natural self-locking property. When the bolt 42 stops rotating, the threaded pair can keep the fixed rod 21 in a stable position. No additional locking device is needed to maintain the clamping state of the conduit for a long time.

[0045] This manual threaded structure requires no external power or air supply. The overall structure is simple, reliable, and easy to operate. At the same time, the clamping force can be precisely adjusted by controlling the number of rotations of the bolt 42, avoiding damage to the catheter due to excessive clamping force or displacement of the catheter due to insufficient clamping force. It is especially suitable for scenarios in cardiovascular and cerebrovascular interventional surgery where the accuracy of catheter fixation is required, thus improving the practicality and safety of the device.

[0046] Please see Figures 9 to 10 Based on Example 2, Example 3: The bottom of the fixed housing 1 is fixedly connected to the lifting frame 5. The adhesive layer 11 is installed at the bottom of the lifting frame 5. The lifting frame 5 is a frame structure that is not completely closed and extends to the insertion position of the catheter body 3. The lifting frame 5 is a hollow structure that can hold dressings or hemostatic cotton.

[0047] Specifically, this embodiment adds a lifting frame 5 to the second embodiment. The lifting frame 5 is fixedly connected to the bottom of the fixed housing 1, and the adhesive layer 11 is set at the bottom of the lifting frame 5.

[0048] The lifting frame 5 is a partially enclosed frame structure that extends to the insertion point of the catheter body 3, increasing the contact area between the device and the patient's skin, dispersing the pressure per unit area, improving the stability of the device's adhesion and fixation, and reducing pressure on the local skin, thus lowering the risk of pressure ulcers.

[0049] The lifting frame 5 has a hollow structure, which raises the main body of the fixed shell 1, creating a reserved space between the clamping mechanism and the wound. This prevents the main body of the device from directly pressing on or obstructing the wound, allowing medical staff to clearly observe the wound condition and facilitating procedures such as dressing changes and hemostasis.

[0050] Meanwhile, the hollow area of ​​the lifting frame 5 can be directly used to place dressings or hemostatic cotton to cover and care for the wound without the need for additional removal of the device. This simplifies the nursing process during surgery, reduces the risk of catheter displacement, and improves the convenience and safety of the surgical procedure.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cardiovascular and cerebrovascular surgical catheter and its fixation mechanism, comprising a fixation shell (1) and a catheter body (3), wherein an adhesive layer (11) is provided at the bottom of the fixation shell (1) for fixing to the patient's skin; and two sets of symmetrical three-point fixation components (2) are provided inside the fixation shell (1), characterized in that: The three-point fixing assembly (2) includes a fixing rod (21) slidably connected to the center of the fixing housing (1). Inside the fixing housing (1) and on both sides of the fixing rod (21), there are symmetrically hinged claws (26). The bottom of the claws (26) is slidably connected to the side wall of the fixing rod (21). The clamping parts of the fixing rod (21) and the claws (26) extend to the outside of the fixing housing (1) to form a semi-open local avoidance area for the catheter body (3) to pass through. When the fixing rod (21) moves outward, it pushes the claws (26) on both sides to rotate inward synchronously, and cooperates with the center of the fixing rod (21) to form a three-point clamping structure to clamp and fix the catheter body (3).

2. The cardiovascular and cerebrovascular surgical catheter and its fixation mechanism according to claim 1, characterized in that: The fixed rod (21) has a cross-shaped structure with four arms extending in all directions. The two arms that cooperate with the gripper (26) are outward-extending support arms. The surface of the support arm is provided with an inclined guide surface. The bottom of the gripper (26) can slide along the inclined surface. When the fixed rod (21) moves outward, the inclined surface pushes the gripper (26) to rotate inward synchronously through the lateral component force.

3. The cardiovascular and cerebrovascular surgical catheter and its fixation mechanism according to claim 2, characterized in that: Both ends of the gripper (26) are hinged with side wheels (262), and the central clamping section of the fixed rod (21) is hinged with a central wheel (211). The central wheel (211) and the side wheel (262) at the upper end of the gripper (26) together form a three-point clamping structure for clamping the conduit body (3). The side wheel (262) at the lower end of the gripper (26) slides on the inclined guide surface of the fixed rod (21) to transmit lateral force to drive the gripper (26) to rotate.

4. The cardiovascular and cerebrovascular surgical catheter and its fixation mechanism according to claim 2, characterized in that: The fixed housing (1) is symmetrically fixedly connected to a hinge shaft (23). Each hinge shaft (23) is hinged with an auxiliary drive plate (22). The auxiliary drive plate (22) is in transmission cooperation with the fixed rod (21) and the gripper (26). When the fixed rod (21) moves, it drives the auxiliary drive plate (22) to swing around the hinge shaft (23) as the center, thereby driving the gripper (26) to rotate.

5. The cardiovascular and cerebrovascular surgical catheter and its fixation mechanism according to claim 4, characterized in that: The surface of the auxiliary drive plate (22) is provided with an arc groove (24) and a straight groove (25). A limiting shaft one (241) is fixedly connected to the surface of the fixed rod body (21), and a limiting shaft two (242) is fixedly connected to the surface of the gripper (26). The limiting shaft one (241) is slidably engaged with the arc groove (24), and the limiting shaft two (242) is slidably engaged with the straight groove (25).

6. The cardiovascular and cerebrovascular surgical catheter and its fixation mechanism according to claim 5, characterized in that: The arc-shaped groove (24) is a groove-shaped structure with one end away from the center of the fixed rod (21) and the other end close to the center of the fixed rod (21). It is used to drive the auxiliary drive plate (22) to swing when the fixed rod (21) moves axially, through cooperation with the limiting shaft (241).

7. The cardiovascular and cerebrovascular surgical catheter and its fixation mechanism according to claim 1, characterized in that: The surface of the gripper (26) is fixedly connected to a hinge shaft (261), which is hinged to the fixed housing (1).

8. A cardiovascular and cerebrovascular surgical catheter and its fixation mechanism according to any one of claims 1-7, characterized in that: The rear end of the fixed housing (1) is provided with a push-lock mechanism (4), which is used to drive the fixed rod (21) to move and lock its position.

9. A cardiovascular and cerebrovascular surgical catheter and its fixation mechanism according to claim 8, characterized in that: The propulsion locking mechanism (4) includes a rotating seat (41) fixedly connected to the rear end of the fixed housing (1). The fixed rod (21) has an internal thread (43) inside. A bolt (42) is rotatably installed inside the rotating seat (41). The bolt (42) is threadedly connected to the internal thread (43). When the bolt (42) is rotated, it can drive the fixed rod (21) to move back and forth and achieve self-locking.

10. A cardiovascular and cerebrovascular surgical catheter and its fixation mechanism according to claim 1, characterized in that: The bottom of the fixed housing (1) is fixedly connected to the lifting frame (5), the adhesive layer (11) is installed at the bottom of the lifting frame (5), the lifting frame (5) is a frame structure that is not completely closed and extends to the insertion position of the catheter body (3), and the lifting frame (5) is a hollow structure that can hold dressings or hemostatic cotton.

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