Device for effectively plugging gap and locking position of pipe body

Abstract

An instrument for effectively plugging a gap and locking the position of a tube body comprises a plugging and locking structure used for plugging the annular gap between a middle-layer tube and an infusion tube and locking the position of the middle-layer tube and the infusion tube. An elastic frustum structure is arranged at the far end of the plugging and locking structure, and a containing tube cavity for containing the infusion tube is formed in the center of the elastic frustum structure; the thickness of the farthest end of the elastic frustum structure is smaller than the ring width of an annular gap between the middle-layer tube and the infusion tube; the fixing structure is fixed on the outer side of the middle-layer pipe and is fixed at the position of the middle-layer pipe after being fixed; and the driving structure is used for being connected with the fixing structure and driving the elastic frustum structure to enter the annular gap, so that the gap is blocked, and the position relation is locked. Through the cooperation of the driving structure and the fixing structure, during operation, only the positions of the middle layer tube and the infusion tube need to be controlled to be unchanged, then plugging and position locking of the middle layer tube and the infusion tube can be achieved very conveniently by rotating the driving structure, and the structure is easy and convenient to operate.

Description

Technical Field

[0001] This invention belongs to the field of auxiliary devices for catheter placement, and more specifically, it is a device for effectively sealing gaps and locking the position of the catheter. Background Technology

[0002] In the field of interventional oncology, transcatheter arterial chemoembolization (TACE) and hepatic artery infusion chemotherapy (HAIC) have become important means of treating solid tumors such as intermediate and advanced liver cancer. Among them, HAIC interventional therapy has advantages such as high local drug concentration and low systemic toxicity because it can continuously infuse high concentrations of chemotherapy drugs directly into the tumor-feeding artery through a catheter.

[0003] One of the core procedures in HAIC interventional therapy is the placement of intravascular catheters. A typical catheter placement structure requires the sequential placement of an outer vascular sheath, a middle layer (usually a guiding catheter or microcatheter, used to establish the operative channel and guide the inner lumen), and an inner infusion catheter (used to precisely deliver chemotherapy drugs to the tumor target vessel). The precision of this three-layered structure directly affects the safety and effectiveness of the treatment. However, in existing technologies, limited by clinical operational needs and lumen design concepts, the following two problems still exist after catheter placement.

[0004] The first issue is that the intermediate layer tube and the inner perfusion tube need to meet different functional requirements (e.g., the intermediate layer tube must have a certain rigidity to support the channel, while the perfusion tube must be flexible to adapt to the blood vessel's course). There is an inherent dimensional difference between their outer and inner diameters. The inner diameter of the intermediate layer tube needs to be slightly larger than the outer diameter of the perfusion tube to ensure smooth insertion and axial movement. However, this dimensional difference leads to an annular gap between them. After placement, arterial blood in the blood vessel can easily leak outwards along the outer wall of the lumen through this annular gap. If the patient has abnormal coagulation function or poor blood vessel wall elasticity, the amount of leakage may further increase. Even if the leakage is small, prolonged leakage can lead to excessive blood loss for the patient, and continuous small amounts of leakage can also increase the workload of medical staff.

[0005] The second issue is that after catheter placement, the internal end of the infusion catheter needs precise positioning to ensure that the drug can reach the tumor tissue completely. However, in the existing structure, the intermediate layer tube and the infusion catheter only rely on "tube nesting" for initial positioning, lacking an effective fixation mechanism. When the patient changes position during the operation (such as diaphragmatic movement due to breathing, unconscious limb movement), or when medical staff accidentally pull on the external end of the infusion catheter during subsequent operations (such as adjusting the infusion rate, changing the medication), the infusion catheter is prone to displacement along the axial direction of the intermediate layer tube, causing the infusion position of its internal end to deviate from the preset target area. If the position deviates to the location of a normal blood vessel, it may cause damage to normal tissue by chemotherapy drugs (such as causing vasculitis, tissue necrosis); if it deviates to the location of a non-target tumor blood vessel, it will lead to insufficient local drug concentration in the tumor, reduce the treatment effect, and may even require the catheter placement operation to be repeated, increasing patient trauma and treatment costs.

[0006] Currently, in clinical practice, the above-mentioned problems are mostly addressed by covering the external end of the infusion tube with a medical transparent membrane or fixing it with adhesive tape. However, the fixing methods are mostly soft. Although they can control bleeding within the covering structure, they still cannot prevent bleeding. In addition, although soft fixing prevents the position of the larger intermediate layer tube and the infusion tube from changing, it still cannot prevent the position of the two from changing. These methods do not eliminate the problem from the structural design level and are difficult to meet the clinical requirements of high safety and high precision for HAIC interventional therapy. Summary of the Invention

[0007] To address the issues of bleeding and easy changes in the perfusion position after catheter placement, a solution is proposed that effectively seals the gap between the intermediate layer tube and the perfusion tube, while simultaneously locking their positional relationship after placement. This solution includes a connector that passes through the intermediate layer tube, extending between the two tubes to lock their position and seal the gap. A movable structure is also included, connected to a driving structure. A fixed structure is also provided, fixed to the intermediate layer tube and positioned behind it. The driving structure and the fixed structure rotate in coordination; rotation in different directions causes the driving structure to move towards or away from the fixed structure. This movement of the driving structure causes the sealing and locking structure to seal the annular gap between the intermediate layer tube and the perfusion tube, simultaneously limiting their relative axial displacement. When the driving structure, driven by rotation, fully extends the sealing and locking structure into the annular gap, its end forms surface contact with the outer wall of the perfusion tube. The distal end of the occlusion and locking structure is an elastic frustum structure, with a receiving lumen in the center of the frustum structure to accommodate the infusion tube. The thickness of the farthest end of the frustum structure is less than the annular width of the gap between the intermediate layer tube and the infusion tube, allowing the occlusion and locking structure to enter the annular gap and completely fill the gap through gradually increasing thickness. The compressive force ensures that the inner side of the frustum structure is in close contact with the infusion tube, and the outer side is in close contact with the inner wall of the intermediate layer tube, achieving effective filling and sealing of the annular gap. At the same time, the surface contact provides stable axial restraint, preventing relative displacement of the infusion tube under blood flow impact or changes in patient position.

[0008] The specific technical solution is as follows: an instrument for effectively sealing gaps and locking the position of the tube body, comprising a sealing and locking structure, a driving structure, and a fixing structure. It should be noted that the proximal end is the end closer to the operator, and the distal end is the opposite end.

[0009] The sealing and locking structure is used to seal the annular gap between the intermediate layer tube and the injection tube, thereby locking the positions of the intermediate layer tube and the injection tube. The sealing and locking structure includes an elastic frustum structure and a receiving cavity. The distal end of the sealing and locking structure is an elastic frustum structure, and the center of the elastic frustum structure is provided with a receiving cavity for the injection tube. The thickness of the farthest end of the elastic frustum structure is less than the annular width of the gap between the intermediate layer tube and the injection tube, so that the sealing and locking structure can enter the annular gap and completely fill the gap by gradually increasing its thickness, thus locking the positions of the intermediate layer tube and the injection tube.

[0010] The fixed structure is fixed to the outside of the intermediate layer tube and then fixed in position to the intermediate layer tube.

[0011] The drive structure is connected to the sealing and locking structure at its proximal end and to the fixed structure at its distal end via a thread. The drive structure rotates in different directions relative to the fixed structure, causing the drive structure to move closer to or away from the fixed structure, thereby driving the sealing and locking structure into or out of the annular gap.

[0012] Furthermore, a fixing structure is located at the connector. The fixing structure includes a base, a central cavity, an annular cavity, and a threaded section. The base is hollow to form the central cavity, and an annular cavity is set inside the sidewall of the base. The threaded section is set on the sidewall of the annular cavity. The central cavity is interference-fitted with the cylindrical part of the connector, so that the position is fixed after assembly. The rotation is driven by the threaded section in the threaded cavity to move closer and further apart through the engagement of the threaded section in the threaded cavity with the threaded section on the threaded pipe.

[0013] Furthermore, the drive structure includes an operating head and a threaded tube, with the threaded tube engaging with a threaded segment. The threaded tube extends into the annular cavity, and rotation is achieved through the engagement of the threaded segment within the cavity and the threaded tube. This, in turn, causes the drive structure and the fixed structure to move closer and further apart. The threaded tube is positioned outside the sealing and locking structure, and an annular groove is provided at the position of the operating head. Correspondingly, an annular protrusion adapted to the annular groove is provided on the sealing and locking structure. Through the engagement of the annular groove and the annular protrusion, the sealing and locking structure itself does not rotate when the operating head rotates; it only moves along the axial direction. This effectively avoids deformation of the instrument structure when the sealing and locking structure is rotated.

[0014] Furthermore, since the sealing and locking structure must pass through the cavity of the connector section before contacting the junction of the intermediate layer tube and the injection tube, the sealing and locking structure also includes a connecting part for connecting the elastic cone structure and the annular protrusion. A central cavity two is provided in the center of the connecting part, and the size of the central cavity two is larger than the outer diameter of the injection tube. The connecting part plays an effective supporting role, which is used to support the elastic cone structure to move downward without deformation when the elastic cone structure moves downward.

[0015] Furthermore, a longitudinal through-hole one is provided from the central lumen one through the outer wall of the cavity, and a longitudinal through-hole two is provided through the side wall between the receiving cavity and the central lumen two; the driving structure contains a central lumen three, and a longitudinal through-hole three is provided from the central lumen three through the outer wall of the cavity; force can enlarge the openings of the longitudinal through-hole one, longitudinal through-hole two, and longitudinal through-hole three to ensure that the sealing and locking structure and the driving structure are sleeved on the outside of the infusion tube, and the fixing structure is sleeved on the outside of the intermediate layer tube and moved to the connector position. After the side walls of the longitudinal through-hole one, longitudinal through-hole two, and longitudinal through-hole three are in close contact, each structure functions. Bio-adhesive is used to connect and seal the side walls of the longitudinal through-hole one and longitudinal through-hole three, while the longitudinal through-hole two is squeezed and fixed by sealing the longitudinal through-hole one and longitudinal through-hole three. This setting can avoid the treatment of smaller sealing and locking structures by bio-adhesive, and instead use natural squeezing force for fixation, which is safer.

[0016] Furthermore, a position-maintaining structure is provided to keep the intermediate layer tube and the infusion tube in their initial state. This position-maintaining structure includes a non-circular insertion structure for inserting into the fixing structure, a connecting rod, and a clamping structure for clamping the infusion tube. After assembly, the connecting rod does not contact the drive structure. A non-circular insertion hole is correspondingly provided on the fixing structure. The fixing structure and position-maintaining structure are combined by inserting the insertion structure into the non-circular insertion hole. Then, the initial positional relationship between the intermediate layer tube and the infusion tube is locked by pinching the clamping structure with hand force. The drive structure is then rotated to lock this position. After sealing and locking, the position-maintaining structure is removed from the position of the fixing structure and the infusion tube.

[0017] Technical effect Through the coordinated operation of the sealing and locking structure, the driving structure, and the fixing structure, the annular gap between the intermediate layer tube and the injection tube after tube placement can be effectively sealed and their positions locked. The sealing and locking structure achieves sealing by the tight contact between the elastic frustum structure of the sealing and locking structure and the injection tube and intermediate layer tube on both sides of the annular gap. The threaded structure of the driving structure and the fixing structure naturally locks the position of the elastic frustum structure when the sealing state is achieved. Combined with the frictional force of the tight contact, the positions of the injection tube and the intermediate layer tube are locked.

[0018] By placing the fixing structure at the connector of the intermediate tube, the overall structure can be made relatively large, and the corresponding drive structure is also larger, which can improve the ease of operation of the entire device. In addition, the central lumen of the fixing structure and the cylindrical part of the connector are interference-fitted, so that the positional relationship between the fixing structure and the intermediate tube is fixed after assembly. Then, through the threaded engagement and relative rotation of the drive structure and the fixing structure, the sealing and locking structure can be driven to move axially, thereby realizing the progressive expansion and tight fit of the elastic frustum structure on the annular gap, effectively sealing the gap and preventing bleeding. At the same time, the self-locking characteristic of the thread combined with the surface contact friction can stably maintain the relative position of the infusion tube and the intermediate tube, avoiding displacement after placement.

[0019] By setting corresponding annular grooves and annular protrusions on the driving structure and the occlusion locking structure, it can be ensured that the rotation of the driving structure does not cause the axial movement of the occlusion locking structure. This ensures that the driving action is only converted into the advancement and expansion of the occlusion element, without causing the rotation of the infusion tube or intermediate layer tube, thus avoiding disturbance to the intravascular environment.

[0020] By setting the sealing and locking structure connection part, it is possible to effectively ensure that the elastic cone structure enters the junction position of the intermediate layer pipe and the injection pipe through the connector, which facilitates the sealing of the annular gap.

[0021] By setting up longitudinal through-hole one, longitudinal through-hole two, and longitudinal through-hole three, the plugging and locking structure and the driving structure can be effectively sleeved on the outside of the infusion tube, while the fixing structure is sleeved on the outside of the intermediate layer tube. The bio-adhesive is used to complete the connection and sealing of the sidewalls of longitudinal through-hole one and longitudinal through-hole three, preventing the bio-adhesive from affecting the plugging and locking structure. The closure of longitudinal through-hole two of the plugging and locking structure is achieved automatically using the closing force of longitudinal through-hole one and longitudinal through-hole three.

[0022] By setting up a position-maintaining structure, the initial positions of the intermediate layer tube and the infusion tube can be guaranteed not to change during the occlusion and locking process. The position of the infusion tube at the front end will not be affected by the occlusion and locking operation, ensuring the stable positioning of the infusion tube tip in the blood vessel during and after the operation, avoiding positional displacement caused by the transmission of operating force, thereby ensuring accurate drug infusion to the target area. Attached Figure Description

[0023] Figure 1 This is a longitudinal sectional view of the device and tube body in a configuration where the threaded tube is shorter than the sealing and locking structure, and the drive structure and sealing and locking structure are separated from the fixed structure. Figure 2 This is a partially enlarged structural diagram of the combination of the intermediate layer pipe and the injection pipe at the connector location; Figure 3 This is a longitudinal sectional view of the device and tube in the combined state of the implementation where the threaded tube is shorter than the sealing and locking structure, and the drive structure, sealing and locking structure and the fixed structure are combined. Figure 4 This is a schematic diagram of the device structure with three types of longitudinal through-holes and the threaded tube being shorter than the sealing and locking structure, and the drive structure and sealing and locking structure being separated from the fixed structure. Figure 5 This is a longitudinal sectional view of the fixed structure portion after the fixed structure and connector are combined. Figure 6 This is a schematic diagram of the longitudinal cross-sectional structure after the combination of the driving structure and the blocking and locking structure. Figure 7 A schematic diagram of a sealing and locking structure with a second longitudinal through-hole; Figure 8 This is a schematic diagram of the overall structure of the device and the tube body in a configuration where the threaded tube is of equal length to the sealing and locking structure. Figure 9 This is a longitudinal sectional view of an embodiment in which the threaded pipe is of equal length to the sealing and locking structure and is combined with the pipe body. Figure 10 A schematic diagram of the overall longitudinal section of the device in an embodiment where the threaded tube is of equal length to the sealing and locking structure. Figure 11 This is a schematic diagram of the overall structure of the device and the tube in the embodiment with a position-maintaining structure. Figure 12 A schematic diagram of a fixing structure with non-circular sockets; Figure 13 A schematic diagram of the position-maintaining structure; Explanation of main figure symbols 1. Sealing and locking structure; 11. Elastic cone structure; 111. Receiving cavity; 12. Annular protrusion; 13. Connecting part; 131. Central cavity two; 14. Longitudinal through port two; 2. Driving structure; 21. Operating head; 211. Annular groove; 22. Threaded tube; 23. Central cavity three; 24. Longitudinal through port three; 25. Longitudinal protrusion; 3. Fixing structure; 31. Central cavity one; 32. Annular cavity; 33. Threaded section; 34. Longitudinal through port one; 35. Protruding block; 351. Non-circular insertion hole; 41. Intermediate layer tube; 411. Connecting head; 42. Injection tube; 5. Position maintaining structure; 51. Non-circular insertion structure; 52. Connecting rod; 53. Clamping structure; 531. Clamping ring; 532. Clamping arm. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In this document, “illustrative” means “serving as an example, illustration or description”, and any illustration or implementation described herein as “illustrative” should not be construed as a more preferred or advantageous technical solution.

[0026] To keep the drawings concise, only the parts relevant to this application are shown schematically in each drawing, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components with the same structure or function is shown schematically, or only one of them is labeled.

[0027] In this document, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] refer to Figure 1-10 A device for effectively sealing gaps and locking tube positions includes a sealing and locking structure 1, a driving structure 2, and a fixing structure 3. It should be noted that the proximal end is the end closer to the operator, and the distal end is the opposite end.

[0029] refer to Figure 2 In the prior art, after the infusion tubing is inserted, two tubing remains outside the body: an intermediate layer tubing 41 and an infusion tubing 42. The end of the intermediate layer tubing 41 has a connector 411, and the infusion tubing 41 passes through the connector 411 to enter the interior of the intermediate layer tubing 411. Figure 2 The image shows a portion of the intermediate layer tube 41 and the infusion tube 42 at the connector 411. The device for effectively sealing the gap and locking the tube position is located at the connector 411 to seal the gap between the intermediate layer tube 41 and the infusion tube 42, and to lock their positional relationship; the gap between the intermediate layer tube 41 and the infusion tube 42 is an annular gap.

[0030] refer to Figure 1 and Figure 7 The sealing and locking structure 1 is used to seal the annular gap between the intermediate layer tube 41 and the injection tube 42, and to lock the positions of the intermediate layer tube 41 and the injection tube 42. The sealing and locking structure 1 includes an elastic frustum structure 11 and a receiving cavity 111. The receiving cavity 111 for the injection tube 42 is provided in the center of the elastic frustum structure 11. The thickness of the farthest end of the elastic frustum structure 11 is less than the annular width of the annular gap between the connector 411 and the injection tube 42, so that the sealing and locking structure 1 can enter the annular gap and completely fill the gap by gradually increasing and moving into the annular gap. As the connector 411 presses the elastic frustum structure 11 inward, the sidewall of the receiving cavity 111 is in close contact with the injection tube 42, thus maintaining the position of the sealing and locking structure 1 to lock the positions of the intermediate layer tube 41 and the injection tube 42. The position of the sealing and locking structure 1 is locked by the cooperation of the fixing structure 3 and the driving structure 2, achieving the purpose of sealing and locking.

[0031] refer to Figure 1 and Figure 4The proximal end of the drive structure 2 is connected to the sealing and locking structure 1, and the distal end is threadedly connected to the fixed structure 3. The drive structure 2 rotates in different directions relative to the fixed structure 3, causing the drive structure 2 to move closer to or away from the fixed structure 3, thereby driving the sealing and locking structure 1 into or out of the annular gap. The drive structure 2 includes an operating head 21 and a threaded tube 22. The threaded tube 22 extends from the end of the operating head 21 and is located on the outside of the sealing and locking structure 1.

[0032] Specifically, the drive structure and the blocking and locking structure are connected by relative rotation, more specifically, as shown in the reference... Figure 1 and Figure 9 The operating head 21 has an annular groove 211, and the sealing and locking structure 1 has an annular protrusion 12 that matches the annular groove 211. During use, the rotation of the operating head 21 drives the rotation of the threaded tube 22, and the thread guides the operating head 21 to move axially while rotating. During the rotation of the annular groove 211, the annular protrusion 12 does not rotate, but only moves axially relative to the injection tube 42. Therefore, when the operating head 21 rotates, the sealing and locking structure 1 itself does not rotate; it only moves along the axial direction. This effectively avoids rotational deformation of the sealing and locking structure 1, ensuring that the sealing and locking structure 1 only moves along the axial direction, guaranteeing the sealing and locking movement path, and ensuring the sealing and locking effect. Specifically, multiple longitudinal grooves are provided on the outer surface of the operating head to increase friction.

[0033] refer to Figure 1 , Figure 3 and Figure 5 The fixing structure 3 is fixed at the position of the connector 411 on the outside of the intermediate layer tube 41. The fixing structure 3 includes a base, a central tube cavity 31, an annular cavity 32, and a threaded section 33. The central tube cavity 31 is interference-fitted with the cylindrical part of the connector 411, so that the position is fixed after assembly. The central tube cavity 31 is formed by the hollow interior of the base. The annular cavity 32 is provided inside the side wall of the base. The threaded section 33 is provided on the side wall of the annular cavity 32. The threaded tube 22 of the driving structure 2 extends into the annular cavity 32. The rotation is driven by the threaded section 33 in the threaded cavity and the threaded structure on the threaded tube 22 to achieve mutual approach and distance.

[0034] To better maintain the locking structure 1 in the sealing position and improve the sealing effect, this application achieves this by using a driving structure 2 and a fixing structure 3 in combination. Through their cooperation, during operation, it is only necessary to keep the positions of the intermediate layer tube 41 and the infusion tube 42 unchanged. Then, by rotating the driving structure 2, the sealing and locking of the intermediate layer tube 41 and the infusion tube 42 can be easily achieved. When further rotation is not possible, the locking structure 1 reaches the position where sealing and locking are possible. This application maintains the position of the locking structure 1 through the cooperation of the fixing structure 3 and the driving structure 2, thereby achieving the sealing and locking function of the intermediate layer tube 41 and the infusion tube 42. The entire device works together reasonably and is simple and convenient to operate.

[0035] A more preferred embodiment is, referring to Figure 1 and Figure 3 The sealing and locking structure 1 also includes a connecting portion 13 for connecting the elastic frustum structure 11 and the annular protrusion 12. A central cavity 131 is provided in the center of the connecting portion 13. The size of the central cavity 131 is larger than the outer diameter of the injection pipe 42 to reduce the resistance when the sealing and locking structure 1 moves along the injection pipe 42, making the movement smoother. The connecting portion 13 also provides effective support, preventing deformation of the elastic frustum structure 11 as it moves downwards. Simultaneously, the connecting portion 13 has a certain thickness to ensure effective support when pushing the sealing and locking structure 1, preventing deformation during movement along the longitudinal axis.

[0036] A more preferred embodiment is, referring to Figure 4-5 The outer wall of the threaded tube is provided with threaded structures from top to bottom; correspondingly, the inner side wall of the annular cavity is also provided with threaded segments from top to bottom, which are provided with the threaded tube. In this way, the sealing and locking structure is first inserted into the connector. As the sealing and locking structure is inserted into the connector, the threaded structure of the threaded tube contacts the threaded segment. Then, the sealing and locking structure is sealed and fixed by rotating the drive structure.

[0037] Further, refer to Figure 8-10To avoid instability during the docking of the sealing and locking structure with the connector, an extension section is provided below the threaded tube, ensuring that the overall length of the threaded tube and the extension section is at least flush with the distal end of the sealing and locking structure. The extension section has no threaded structure. An annular space corresponding to the extension section is provided on the annular cavity, and the sidewall of the annular space has no threaded structure. By providing the extension section of the threaded tube and the annular space of the annular cavity, the movement direction of the sealing and locking structure can be guided, allowing the frustum structure 11 to enter the hollow cavity of the connector 411 more stably. Additionally, an annular cavity 32 is provided within the base to mate with the threaded tube 22. Since the annular cavity 32 is located inside the base, the thickness and strength of the base itself can create a stable structure, avoiding the risk of movement deviation or overall deformation of the device due to instability in the threaded mating structure.

[0038] A more preferred embodiment is, referring to Figure 1 and Figure 9 The outer shape of the connecting part 13 and the elastic cone structure 11 matches the inner cavity of the connector 411, so that the sealing and locking structure 1 can better play its supporting and connecting role after fixing, and avoid structural deformation.

[0039] A more preferred embodiment is, referring to Figure 1 , 4 and Figure 7 The fixed structure 3 has a longitudinal through-hole 34 extending outward from the central cavity 31 through the outer wall of the cavity; the sealing and locking structure 1 has a longitudinal through-hole 14 extending outward from the side wall between the receiving cavity 111 and the central cavity 131; the driving structure 2 includes a central cavity 23 and a longitudinal through-hole 24 extending outward from the central cavity 23 through the outer wall of the cavity; in use, the longitudinal through-hole 34, longitudinal through-hole 14, and longitudinal through-hole 24 are opened, and the injection tube 42 and the intermediate layer tube 41 are inserted into the corresponding central cavity through each longitudinal through-hole, so that the sealing and locking structure 1 and the driving structure 2 are sleeved on the outside of the injection tube 42, and the fixed structure 3 is sleeved on the outside of the intermediate layer tube 41, and then moved to the position of the connector 411. After the longitudinal through-hole 34, longitudinal through-hole 14, and longitudinal through-hole 24 are in close contact with each other, each structure functions. In practice, bio-adhesive is used to connect and seal the sidewalls of longitudinal penetration one 34 and longitudinal penetration three 24. Longitudinal penetration two 14 is then fixed by compression through the sealing of longitudinal penetration one 34 and longitudinal penetration three 24. This arrangement avoids the need for bio-adhesive to handle the smaller sealing and locking structure 1, instead utilizing the compression force of the driving structure 2 and the fixing structure 3 for fixation, making this method safer.

[0040] To prevent the injection tube 42 from moving along with the axial movement of the sealing and locking structure 1, please refer to... Figure 11-13The device also includes a position maintaining structure 5, which is used to maintain the initial state of the intermediate layer tube 41 and the injection tube 42. The position maintaining structure 5 includes a non-circular insertion structure 51 inserted into the fixing structure 3, a connecting rod 52, and a clamping structure 53 for clamping the injection tube 42. After assembly, the connecting rod 52 does not contact the driving structure 2. A non-circular insertion hole 351 is provided on the fixing structure 3. In specific implementation, the non-circular insertion hole 351 is provided on the protruding block 35 protruding from the outside of the fixing structure 3. The fixing structure 3 and the position maintaining structure 5 are combined by inserting the insertion structure into the non-circular insertion hole 351. Then, the clamping force of the clamping structure 53 is used to lock the initial positional relationship between the intermediate layer tube 41 and the injection tube 42. Then, the driving structure 2 is rotated to complete the sealing and locking of the pipeline. After sealing and locking, the position maintaining structure 5 is withdrawn from the position of the fixing structure 3 and the injection tube 42.

[0041] A more preferred embodiment is that the connecting rod 52 positions the clamping structure 53 on the proximal outer side of the driving structure 2. This ensures that the position maintaining structure 5 does not affect the movement of the sealing and locking structure 1. The clamping structure 53 includes a central clamping ring 531 and two edge clamping arms 532. The two clamping arms 532 move close to each other to clamp the infusion tube 42 with the clamping ring 531. Combined with the cooperation of the fixing structure 3, this fixes the position of the infusion tube 42 and the intermediate layer tube 41 during operation.

[0042] The procedure for using the device is as follows: Before insertion, the sealing and locking structure 1, the driving structure 2, and the fixing structure 3 are fitted onto the tube body through the edges of each tube and moved to a basically suitable position; or after insertion, the sealing and locking structure 1, the driving structure 2, and the fixing structure 3 are fitted onto the outside of the intermediate layer tube 41 and the infusion tube 42 by enlarging each longitudinal penetration, the fixing structure 3 is moved to the connector 411, and the longitudinal penetration one 34 and the longitudinal penetration three 24 are sealed with bio-adhesive, while the longitudinal penetration two 14 is sealed at the same time. After completing the setup, insert the non-circular insertion structure 51 of the position holding structure 5 into the non-circular insertion hole 351. Use the connecting rod 52 to set the clamping ring 531 of the clamping structure 53 to the position of the infusion tube 42. Then, pinch the clamping arm 532 to make the clamping ring 531 clamp the infusion tube 42. In this way, the positions of the intermediate layer tube 41 and the infusion tube 42 are fixed by the fixing structure 3 and the clamping structure 53, so that they are kept in the position after the tube placement is completed and will not be interfered with by the sealing and locking operation. Then, rotate the operating head 21 of the drive structure 2 to drive Structure 2 drives the sealing and locking structure 1 to move downward until the elastic frustum structure 11 enters the annular gap. Then, the position of the injection pipe 42 is kept unchanged by the close contact between the frustum structure and the injection pipe 42. Since the positional relationship between the fixing structure 3 and the intermediate layer pipe 41 is fixed, all positional relationships are locked once the driving structure 2 stops rotating. At this time, the position holding structure 5 is released and removed. The sealing and locking structure 1, the driving structure 2 and the fixing structure 3 can effectively ensure the sealing and locking of the annular gap.

[0043] The above are merely specific embodiments of this application. Under the guidance of the above teachings, those skilled in the art can make other improvements or modifications based on the above embodiments. Those skilled in the art should understand that the above specific description is only to better explain the purpose of this application, and the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for effectively sealing gaps and locking the position of the tube body, characterized in that, The sealing and locking structure includes an elastic frustum structure and a receiving cavity; the distal end of the sealing and locking structure is the elastic frustum structure, and the receiving cavity for accommodating the infusion tube is provided in the center of the elastic frustum structure; The thickness of the farthest end of the elastic cone structure is less than the annular width of the annular gap between the intermediate layer tube and the injection tube, so that the sealing and locking structure can enter the annular gap and completely fill the gap by gradually increasing thickness, thus sealing the annular gap and locking the position of the intermediate layer tube and the injection tube. The sealing and locking structure is used to seal the annular gap between the intermediate layer tube and the injection tube, and to lock the positions of the intermediate layer tube and the injection tube. A fixed structure is fixed to the outside of the intermediate layer tube, and its position is fixed to that of the intermediate layer tube after fixing; The driving structure is connected to the sealing and locking structure at its proximal end and threadedly connected to the fixed structure at its distal end. The driving structure rotates relative to the fixed structure, causing the driving structure to move closer to or away from the fixed structure, thereby driving the sealing and locking structure into or out of the annular gap.

2. The device according to claim 1, characterized in that, The fixing structure includes a base, a central cavity, an annular cavity, and a threaded section. The central cavity is formed by the hollow interior of the base. The annular cavity is disposed inside the sidewall of the base. The threaded section is disposed on the sidewall of the annular cavity. The central cavity is press-fitted with the cylindrical portion of the connector of the tube body, so that the position is fixed after assembly.

3. The device according to claim 2, characterized in that, The driving structure includes the operating head and a threaded tube, the threaded tube engaging with the threaded segment; the threaded tube extends into the annular cavity, and rotation is achieved through the engagement of the threaded segment within the threaded cavity and the threaded tube, thereby causing the driving structure and the fixed structure to move closer and further apart. The threaded tube is located outside the sealing and locking structure, and an annular groove is provided at the position of the operating head, with an annular protrusion on the sealing and locking structure corresponding to the annular groove.

4. The device according to claim 3, characterized in that, The sealing and locking structure also includes a connecting part for connecting the elastic cone structure and the annular protrusion. A central cavity two is provided in the center of the connecting part, and the size of the central cavity two is larger than the outer diameter of the injection tube. The connecting part is used to support the elastic cone structure to prevent it from deforming when it moves downward.

5. The device according to claim 3, characterized in that, The outer wall of the threaded tube is provided with a threaded structure from top to bottom; correspondingly, the inner side wall of the annular cavity is also provided with a threaded segment from top to bottom that corresponds to the threaded tube. Preferably, an extension section is provided below the threaded tube, such that the overall length of the threaded tube and the extension section is at least flush with the distal end of the sealing and locking structure, and the extension section has no threaded structure; an annular space corresponding to the extension section is provided on the annular cavity, and the sidewall of the annular space has no threaded structure.

6. The device according to claim 5, characterized in that, The contours of the connecting portion and the elastic frustum structure match the inner cavity of the connector.

7. The device according to claim 4, characterized in that, The fixed structure sidewall includes a longitudinal through-hole 1 extending outward from the central lumen 1 through the outer wall of the cavity; the sealing and locking structure includes a longitudinal through-hole 2 extending through the sidewall between the receiving lumen and the central lumen 2; the driving structure contains a central lumen 3 in the center, and the driving structure also includes a longitudinal through-hole 3 extending outward from the central lumen 3 through the outer wall of the cavity.

8. The device according to claim 7, characterized in that, Bio-adhesive is used to connect and seal the sidewalls of the first and third longitudinal penetrations, while the second longitudinal penetration is fixed by compression through the sealing of the first and third longitudinal penetrations.

9. The device according to any one of claims 1-8, characterized in that, It also includes a position maintaining structure for maintaining the initial state of the intermediate layer tube and the infusion tube. The position maintaining structure includes a non-circular insertion structure inserted into the fixing structure, a connecting rod, and a clamping structure for clamping the infusion tube. After assembly, the connecting rod does not contact the driving structure. The fixing structure is provided with a non-circular insertion hole.

10. The device according to claim 9, characterized in that, The clamping structure is located on the proximal outer side of the drive structure; the clamping structure has a tendency to retract inward in its natural state, which can closely fit the outer wall of the infusion tube and provide a stable clamping force.

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