Concomitant angiographic catheter

Abstract

The accompanying angiographic catheter comprises an outer tube, a functional catheter and a fixed catheter are arranged in the outer tube in a penetrating mode, an injection connector is arranged at the near end of the functional catheter, and a sliding fixing part used for fixing a target instrument is arranged in the fixed catheter in a penetrating mode; the sliding fixing part comprises a sliding fixing tube, a control part and a fixing part connected to the far end of the control part, the sliding fixing tube is of a cylindrical structure or a tubular structure and penetrates through the fixing catheter, the control part penetrates through the sliding fixing tube, and the fixing part is of a circle structure defined by a thin line; the cross section direction of the outer pipe is of a foldable bending structure, and the bending structure is of an elastic structure which can be expanded and retracted. The device has the advantages of being easy and convenient to operate, accurate in radiography target spot, suitable for functional catheters and fixed catheters of various diameters, suitable for being used in cooperation with target instruments and shadow catheters of various models, and good in passing performance.

Description

Technical Field

[0001] The invention relates to a companion angiography catheter, belonging to the technical field of medical devices. Background Art

[0002] With technological advancements and the widespread adoption of new concepts, interventional cardiovascular procedures are becoming increasingly widespread. During interventional procedures, contrast agents are often used to perform intravascular imaging to clearly visualize the cardiovascular anatomy. In current practice, the angiography catheter and the device delivery catheter are often separate instruments, delivered through two different access points. For example, in transcatheter aortic valve replacement (TAVR) procedures, in addition to the valve delivery system catheter, a pigtail catheter is also inserted through a separate access point for angiography. During left atrial appendage occlusion, angiography cannot be performed until the device is deployed. Angiography can only be performed through the delivery catheter after the device is pushed out. Simultaneous angiography during the deployment process requires insertion of a separate catheter. This use of an additional catheter for angiography, independent of the delivery system, increases the number of surgical steps. The angiography catheter is often located far from the delivery system and implanted device, requiring manipulation to bring it into close proximity with the implanted device and the target implantation site for imaging guidance. Therefore, a catheter that can accompany the implanted device delivery system and provide angiography capabilities is needed to meet current clinical needs. Summary of the Invention

[0003] The technical problem to be solved by the present invention is: how to make the catheter realizing the angiography function and the delivery system of the implanted device accompany each other.

[0004] In order to solve the above technical problems, the technical solution of the present invention is to provide a companion angiography catheter, which is characterized in that it includes an outer tube, a functional catheter and a fixed catheter are passed through the outer tube, an injection connector is provided at the proximal end of the functional catheter, and a sliding fixed component for fixing the target device is passed through the fixed catheter; the sliding fixed component includes a sliding fixed tube, an operating member and a fixed member connected to the distal end of the operating member, the sliding fixed tube is a cylindrical structure or a tubular structure, the sliding fixed tube is passed through the fixed catheter, the operating member is passed through the sliding fixed tube, and the fixed member is a circle structure formed by a thin line; the cross-sectional direction of the outer tube is a foldable bending structure, and the bending structure is an elastic structure that can be stretched and retracted.

[0005] Preferably, at least one operating member is provided in the sliding fixed tube, and the distal end of each operating member is connected to a fixing member; the operating member is a thin long wire, and the fixing member is a circle structure formed by thin wires, and the operating member and the fixing member are connected or integrally formed.

[0006] Preferably, the circular structure of the fixing member is larger than the covered portion of the target device.

[0007] Preferably, the wall of the outer tube includes at least one bending structure extending to the entire length of the outer tube, and the bending direction of the bending structure is along the circumference of the wall of the outer tube.

[0008] Preferably, the outer tube is a multi-cavity structure that is foldable and interconnected in the cross-sectional direction, and the cross-section includes multiple arcs with different diameters, and any two adjacent arcs are connected by one or more foldable bending structures.

[0009] Preferably, the outer tube is a double-cavity structure that is foldable and connected in the cross-sectional direction, with two arcs of different diameters at both ends of the cross-section, and the two arcs are connected on both sides by one or more foldable bending structures; the outer tube includes a large arc cavity and a small arc cavity, and one or more bending structures are formed at the connection between the large arc cavity and the small arc cavity; the functional catheter is arranged in the large arc cavity, and the fixed catheter is arranged in the small arc cavity.

[0010] Preferably, the bending structure is in a tightly folded state in its natural state; when the fixed catheter is not delivered into the outer tube, part of the small arc cavity is in a folded and contracted state; after passing through the functional catheter, the fixed catheter is delivered from the small arc cavity, and the folded part of the outer tube opens and expands into a circular structure; the functional catheter and the fixed catheter respectively pass through the two arc cavities of the outer tube and then are close to each other.

[0011] Preferably, both the functional catheter and the fixed catheter are slender hollow catheters; the distal end of the fixed catheter is located proximal to the distal end of the functional catheter, and the outer diameter of the fixed catheter is smaller than that of the functional catheter.

[0012] Preferably, the proximal end of the functional catheter is connected to a second connecting tube, which is a cylindrical or funnel-shaped structure with a diameter larger than the lumen of the functional catheter. The second connecting tube is provided with two openings, one opening is fastened or integrally connected to the proximal end of the functional catheter, and the other opening is an injection connector for sealing and clamping the needle end of the syringe; the proximal end of the fixed catheter is connected to a first connecting tube, which is a cylindrical structure with a diameter larger than the lumen of the fixed catheter. The first connecting tube is provided with two openings, one opening is fastened or integrally connected to the fixed catheter, and the other opening is larger than the maximum outer diameter of the sliding fixed component and can allow the sliding fixed component to pass through.

[0013] Preferably, it further comprises at least one outer tube fixing part, which is an elastic structure and a short arc tube with a small notch. The outer tube fixing part is tightly held and evenly distributed on the outside of the outer tube.

[0014] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0015] 1. Easy operation: The catheter of the present invention is fixed to the target catheter (device) and can be delivered to the target location in a companion manner through the same access route, without the need for a second access route to deliver the angiographic catheter or to manipulate the delivery catheter position;

[0016] 2. Precise imaging target. The catheter tip of the present invention is aligned with the target catheter tip (instrument), so the imaging location is the target location, making the imaging target more precise. Simultaneously, imaging can be performed in real time while the target instrument is being released, providing more accurate surgical imaging guidance.

[0017] 3. A single type of outer tube can be used with functional catheters and fixed catheters of various diameters, suitable for use with various types of target instruments and imaging catheters, and achieves good passability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of a companion angiography catheter. DETAILED DESCRIPTION

[0019] To make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0020] In the present invention, the proximal end is the end closer to the operator during operation, the distal end is the end farther from the operator and closer to the cardiovascular target location, the center is the lumen center, and the periphery is the side away from the center.

[0021] The present invention provides a companion angiography catheter, such as Figure 1 As shown, it includes an outer tube 3, a functional catheter 5, a fixed catheter 4, a sliding fixing component, and an outer tube fixing part 6.

[0022] The outer tube 3 is a multi-lumen structure with a foldable cross-section and interconnected chambers. Its cross-section consists of multiple arcs of varying diameters, each connected by one or more foldable W-shaped bends 31. The connection between any two adjacent arcs forms one or more foldable W-shaped structures. The bends 31 are elastic structures that can be expanded (the material can be elastic stainless steel or memory metal), and in their natural state, they are in a tightly folded, compressed W-shape. The outer tube 3 is approximately circular in shape (after the functional catheter 5 and fixed catheter 4 are inserted).

[0023] In this embodiment, the outer tube 3 is a foldable, interconnected dual-lumen structure with two arcs of different diameters at each end of the cross section. The two arcs are connected by one or more foldable W-shaped bend structures 31. Specifically, the outer tube 3 is a dual-arc structure with one large and one small arc, and the connection between the two arc cavities (i.e., the large arc cavity and the small arc cavity) is formed into one or more foldable W-shaped shapes.

[0024] In this embodiment, the two ends of the two arcs are connected by a foldable W-shaped bending structure 31. The outer tube 3 is made of ultra-thin polymer material, and the tube wall of the outer tube 3 is woven with metal mesh to increase elasticity.

[0025] The functional catheter 5 is inserted into the large arc lumen, while the fixed catheter 4 is inserted into the small arc lumen. When the fixed catheter 4 is not inserted into the outer tube 3, the small arc lumen is mostly folded and contracted, maximizing vascular accessibility. After the functional catheter 5 passes through, the fixed catheter 4 is then inserted through the small arc lumen. The folded portion of the outer tube 3 opens, expanding into a nearly circular shape. This delivery method achieves even better vascular accessibility.

[0026] The functional catheter 5 is a slender hollow catheter used to deliver the target device. The fixed catheter 4 is also a slender hollow catheter. The functional catheter 5 and the fixed catheter 4 pass through the two arc-shaped lumens of the outer tube 3 and then abut against each other. The outer tube 3's foldable and elastic design can accommodate functional catheters 5 and fixed catheters 4 of varying diameters and abut against each other, thus reducing the outer diameter of the catheter and making the outer tube 3 nearly circular, facilitating delivery into a blood vessel.

[0027] The functional catheter 5 is constructed of a polymer material and is an elongated, thin-walled, hollow tubular structure. The proximal end of the functional catheter 5 also includes a second connecting tube 51, a cylindrical or funnel-shaped structure with a larger diameter than the lumen of the functional catheter 5, to facilitate connection with the needle end of an external syringe. The second connecting tube 51 has two openings. One opening is slightly larger than the opening at one end of the functional catheter 5 and fits over the outer wall of the opening at the end of the functional catheter 5, thereby securing or integrally connecting it to the functional catheter 5. The other opening is an injection connector 52, which is used to seal and engage the needle end of the syringe.

[0028] In another embodiment, a hemostatic silicone valve 53 is further provided within the second connecting barrel 51 to prevent blood from escaping the second connecting barrel 51. The hemostatic silicone valve 53 is similar to a one-way valve, or may be formed by cutting multiple radial segments from the center of a disc-shaped silicone sheet to form a passable structure. The hemostatic silicone valve 53 may be located at the outlet of the injection connector 52 and pass through the outlet of the injection connector 52, with the center of the disc-shaped silicone sheet clamping the outlet of the injection connector 52.

[0029] The fixed catheter 4 is a slender hollow catheter made of a polymer material. The distal end of the fixed catheter 4 is located proximal to the distal end of the functional catheter 5, and the outer diameter of the fixed catheter 4 is smaller than that of the functional catheter 5. The cross-section of the fixed catheter 4 is circular or elliptical. The proximal end of the fixed catheter 4 also includes a first connecting tube 41, which is a cylindrical structure with a diameter larger than the lumen of the fixed catheter 4 to achieve greater resistance to external operating pressure. The first connecting tube 41 is also provided with two openings, one opening is slightly larger than the opening at one end of the fixed catheter 4, and is sleeved on one end of the fixed catheter 4, thereby being fastened or integrally connected to the fixed catheter 4, and the other opening is slightly larger than the maximum outer diameter of the sliding fixed component, which can be used for the sliding fixed component to pass through. A protruding operating handle is welded or integrally formed on one side of the first connecting tube 41.

[0030] The sliding fixing component is a slender component that runs and slides in the fixed catheter 4 and is exposed at both ends from the fixed catheter 4. The sliding fixing component includes a sliding fixing tube 2, an operating member 1 and a fixing member 11 located at the distal end of the operating member 1. At least one operating member 1 is provided in the sliding fixing tube 2, and each operating member 1 is connected to a fixing member 11 at the distal end. The sliding fixing tube 2 also has a cylindrical structure or a tubular structure and is made of metal or a polymer material with strong tensile strength.

[0031] The fixing part 11 is a thin wire that forms a circle structure, or a spiral structure; the operating part 1 is a thin long wire, and the operating part 1 and the fixing part 11 are connected or formed as one piece. When in use, the fixing part 11 is put on the target device, and by pulling the operating part 1 toward the proximal end, the fixing part 11 can be gradually brought into the sliding fixing tube 2, so that the single or multiple circles of the fixing part 11 (a single circle corresponds to when the fixing part 11 is a circle structure; multiple circles correspond to when the fixing part 11 is a spiral structure, that is, multiple circles connected together to form a spiral circle. Equivalent to a spiral or thread shape) become smaller, so that the fixing part 11 is firmly put on the target device, so that the entire accompanying radiographic catheter is fixed on the target device.

[0032] The outer tube fixing member 6 is a short, thin, circular tube with a small notch. It is made of elastic stainless steel sheet (wire), nickel-titanium sheet (wire), or polymer material. Due to the presence of the notch, the outer tube fixing member 6 can open the notch to tightly embrace the outer tube 3, ensuring the contraction force of the outer tube 3 and forming it to the minimum outer diameter. There can be multiple outer tube fixing members 6, evenly sleeved on the outer tube 3. The outer tube fixing member 6 can also be compositely embedded in the side wall of the outer tube 3. The outer tube fixing member 6 is not optional, but can be used to enhance the elastic force when the outer diameter of the outer tube 3 is large and the elasticity is insufficient.

[0033] The use process of the present invention is as follows:

[0034] During use, the accompanying angiographic catheter is first inserted into the patient's body, and the distal fixing member 11 of the sliding fixing component is placed on the proximal end of the target device (such as the proximal end of the left atrial appendage occluder delivery system). The operating member 1 is then tightened, so that the fixing member 11 firmly fixes the target device to the end of the sliding fixing tube 2. The accompanying angiographic catheter and the target device are then delivered to the surgical target site along the blood vessel. After that, contrast agent is injected into the injection connector 52 on the outside of the body of the functional catheter 5 to complete accurate and clear angiographic imaging of the surgical target site. The entire operation process is simple and precise.

Claims

1. A companion angiography catheter, characterized in that: The invention comprises an outer tube (3), wherein a functional catheter (5) and a fixed catheter (4) are passed through the outer tube (3), an injection connector (52) is provided at the proximal end of the functional catheter (5), and a sliding fixed component for fixing a target device is passed through the fixed catheter (4); the sliding fixed component comprises a sliding fixed tube (2), an operating member (1), and a fixing member (11) connected to the distal end of the operating member (1); the sliding fixed tube (2) is a cylindrical structure or a tubular structure, the sliding fixed tube (2) is passed through the fixed catheter (4), the operating member (1) is passed through the sliding fixed tube (2), and the fixing member (11) is a circle structure formed by a thin line; the cross-sectional direction of the outer tube (3) is a foldable bending structure (31), and the bending structure (31) is an elastic structure that can be stretched and retracted.

2. A companion angiography catheter according to claim 1, characterized in that: At least one operating member (1) is provided in the sliding fixed tube (2), and the distal end of each operating member (1) is connected to a fixing member (11); the operating member (1) is a thin long wire, and the fixing member (11) is a thin wire forming a circle or a spiral structure, and the operating member (1) and the fixing member (11) are connected or integrally formed.

3. A companion angiography catheter according to claim 1 or 2, characterized in that: The circular structure of the fixing member (11) is larger than the covered portion of the target device.

4. The accompanying angiography catheter according to claim 1, characterized in that: The wall of the outer tube (3) comprises at least one section of a bending structure (31) extending to the entire length of the outer tube (3), and the bending direction of the bending structure (31) is along the circumference of the wall of the outer tube (3).

5. The accompanying angiography catheter according to claim 4, characterized in that: The outer tube (3) is a multi-cavity structure that is foldable and interconnected in the cross-sectional direction. The cross-section includes a plurality of arcs with different diameters, and any two adjacent arcs are connected by one or more foldable bending structures (31).

6. The accompanying angiography catheter according to claim 4, characterized in that: The outer tube (3) is a double-cavity structure that is foldable and connected in the cross-sectional direction, with two arcs of different diameters at both ends of the cross-section, and the two sides of the arcs are connected by one or more foldable bending structures (31); the outer tube (3) includes a large arc cavity and a small arc cavity, and one or more bending structures (31) are formed at the connection between the large arc cavity and the small arc cavity; the functional catheter (5) is arranged in the large arc cavity, and the fixed catheter (4) is arranged in the small arc cavity.

7. The accompanying angiography catheter according to claim 6, characterized in that: The bending structure (31) is in a tightly folded state in a natural state; when the fixed catheter (4) is not transported into the outer tube (3), the small arc cavity portion is in a folded and contracted state; after passing through the functional catheter (5), the fixed catheter (4) is transported from the small arc cavity, and the folded portion of the outer tube (3) opens and expands into a circular structure; the functional catheter (5) and the fixed catheter (4) respectively pass through the two arc cavities of the outer tube (3) and are close to each other.

8. The accompanying angiographic catheter according to claim 1, characterized in that: The functional catheter (5) and the fixed catheter (4) are both slender hollow catheters; the distal end of the fixed catheter (4) is located proximal to the distal end of the functional catheter (5), and the outer diameter of the fixed catheter (4) is smaller than that of the functional catheter (5).

9. The accompanying angiography catheter according to claim 1, characterized in that: The proximal end of the functional catheter (5) is connected to a second connecting tube (51), which is a cylindrical or funnel-shaped structure with a larger diameter than the lumen of the functional catheter (5). The second connecting tube (51) is provided with two openings, one of which is fastened or integrally connected to the proximal end of the functional catheter (5), and the other opening is an injection connector (52) for sealing and clamping the needle end of the syringe; the proximal end of the fixed catheter (4) is connected to a first connecting tube (41), which is a cylindrical structure with a larger diameter than the lumen of the fixed catheter (4). The first connecting tube (41) is provided with two openings, one of which is fastened or integrally connected to the fixed catheter (4), and the other opening is larger than the maximum outer diameter of the sliding fixed component and can be used for the sliding fixed component to pass through.

10. The accompanying angiography catheter according to claim 1, characterized in that: It also includes at least one outer tube fixing member (6), which is an elastic structure and a short arc tube with a small notch. The outer tube fixing member (6) is tightly held and evenly distributed on the outside of the outer tube (3).

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