Guide catheter

Abstract

The utility model provides a guiding catheter which is used for coronary vein surgery and comprises a base and a catheter body which are connected, the catheter body comprises at least one hollow cavity, and the guiding catheter is characterized by comprising a main body part and a guiding part, the transition part is connected with the main body part, and the transition part comprises at least one arc-shaped structural body; and the end part is connected with the transition part. By adopting the special arc-shaped structure, the guide catheter is more convenient to rotate in the coronary sinus, the problem that the head end of the catheter can be quickly aligned with a vein opening is solved, and the operation time is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of medical instruments, in particular to a guiding catheter used for coronary sinus surgery. Background Art

[0002] The coronary sinus is the main entrance for blood return from the cardiac wall veins. It is the place where many veins, including the great cardiac vein, middle cardiac vein, small cardiac vein, posterior left ventricular vein, and posterior left atrial vein, converge first. It is located in the coronary groove between the left atrium and left ventricle on the diaphragmatic surface of the heart, and will eventually open into the right atrium, between the inferior vena cava valve and the right atrioventricular orifice.

[0003] In coronary vein surgery, the doctor uses a long sheath to insert the guide catheter into the coronary sinus, and uses the control handle to align the end of the guide catheter with the opening of the coronary sinus to build a pathway for other instruments to enter the coronary vein. Since the coronary vein has a narrow space and thin blood vessel walls, improper use of medical equipment or excessive force when building the pathway during surgery can cause scratches on the inner wall of the blood vessel or even rupture of the blood vessel, ultimately leading to medical accidents.

[0004] Chinese invention patent application CN108014408A discloses a coronary vein guidance system, including a coronary vein guidance catheter and a flexible inner tube inserted therein; the coronary vein guidance catheter includes a coaxial section, an anti-bending section and a twist control section in sequence; a flexible head end is provided at the end of the coaxial section; the coaxial section is connected to the anti-bending section at an obtuse angle of 136° to 140°; the anti-bending section is connected to the twist control section at an obtuse angle of 138° to 142°; the coaxial section and the twist control section are on the same side of the anti-bending section, and the three sections are located in the same plane; the length of the flexible inner tube is 18cm to 22cm longer than that of the coronary vein guidance catheter; the head end of the flexible inner tube is in the same direction as the coaxial section, and a spiral interface is provided at the tail end of the flexible inner tube. This structural design can adapt to the anatomical structure of the heart and can greatly reduce the difficulty of implementing interventional surgery for chronic total occlusive lesions of the heart.

[0005] Chinese utility model patent CN201820297541.9 discloses a coronary sinus guiding catheter, including a catheter body, the catheter body having a hollow flexible outer tube and a plastic inner core, the flexible outer tube and the plastic inner core are separable, and the distal end of the flexible outer tube is provided with at least one X-ray-proof mark. The design has both angiography and delivery guide wire functions, and plastic steel wires of different hardness can be selected according to individual conditions and molded into a suitable arc, which can avoid venous vascular damage and provide suitable support force to deliver the long coronary sinus sheath into the coronary sinus. It is suitable for finding the coronary sinus and providing a certain support force to deliver the long left ventricular sheath into the coronary sinus. Utility Model Content

[0006] The inventors have discovered through research that guiding catheters in the prior art are mostly used for coronary artery surgery. Although there are guiding catheters for coronary vein surgery, their curved design is not completely suitable for use in the coronary sinus. In addition, the tip of the guiding catheter is relatively hard, while the outer wall of the coronary sinus is relatively thin. There is still a risk of damaging the blood vessel wall during the operation of the guiding catheter.

[0007] Based on the anatomical structure of the coronary vein and the thin wall of the blood vessels, the utility model provides a guiding catheter for coronary vein surgery, including a connected base and a catheter, the catheter including at least one hollow cavity, characterized in that the catheter includes: a main body connected to the base; a transition part connected to the main body, the transition part including at least one arc-shaped structure; and an end part connected to the transition part.

[0008] According to some specific embodiments of the present invention, the transition portion includes a first structure, a second structure and a third structure which are connected in sequence from the proximal end to the distal end.

[0009] Preferably, the transition portion includes a fourth structure.

[0010] According to some specific embodiments of the present invention, the length of the end portion is 4.0 to 6.0 mm.

[0011] According to some specific embodiments of the present invention, the length of the transition portion is 27.0 to 30.0 mm.

[0012] According to certain specific embodiments of the present invention, the length L1 of the first structure ranges from 14.0 to 16.0 mm, the length L2 of the second structure ranges from 6.0 to 8.0 mm, the length L3 of the third structure ranges from 4.0 to 6.0 mm, and the length L4 of the fourth structure ranges from 2.0 to 3.0 mm.

[0013] According to some specific embodiments of the present invention, the length X of the transition portion in the horizontal axis direction ranges from 24.0 to 26.0 mm.

[0014] According to some specific embodiments of the present invention, the length Y of the transition portion in the longitudinal direction is in the range of 8.0 to 10.0 mm.

[0015] According to some specific embodiments of the present invention, the catheter is integrally formed.

[0016] According to certain specific embodiments of the present invention, the main body of the catheter includes a polyetheramide resin layer, a stainless steel braided layer, and a polytetrafluoroethylene layer from the outer layer to the inner layer.

[0017] According to certain specific embodiments of the present invention, the end of the catheter includes a polyetheramide resin layer.

[0018] According to certain specific embodiments of the present invention, the guiding catheter further includes a stress relief tube.

[0019] Compared with the prior art, the technical solution of the embodiment of the utility model has the following beneficial effects:

[0020] First, the end of the guide catheter was designed so that it could enter the blood vessel smoothly. The special curved structure made it easier to rotate the guide catheter in the coronary sinus, solving the problem of how the end of the catheter could be quickly aligned with the vein opening and shortening the operation time.

[0021] Secondly, the catheter is made of soft material, which can solve the problem of easily scratching the coronary vein when twisting the surgical instruments during coronary vein surgery, thereby improving the safety of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of the present utility model, and the various components in the drawings are not drawn to scale.

[0023] Figure 1 It is a schematic diagram of the technical field to which the utility model belongs.

[0024] Figure 2 It is an overall schematic diagram of a guiding catheter according to certain specific embodiments of the utility model.

[0025] Figure 3 It is a partial schematic diagram of a guiding catheter according to certain specific embodiments of the utility model.

[0026] Main marking instructions

[0027] Guide catheter 1 Base 10 Handle 100

[0028] Conduit 20 Main body 210 Transition part 220 End 230

[0029] First structure 220 (1) Second structure 220 (2)

[0030] Third structure 220 (3) Fourth structure 220 (4) DETAILED DESCRIPTION

[0031] Unless otherwise specified, the raw materials used in the examples are all commercially available industrial products and can be purchased through commercial channels.

[0032] Unless otherwise indicated, all numbers used in this specification and claims to represent feature sizes, quantities and physical properties should be understood to be modified by the term "about". Therefore, unless otherwise stated, the numerical parameters listed in this specification and the attached claims are approximate values. According to the teachings of the utility model, a person of ordinary skill in the art can appropriately change these approximate values ​​to obtain the desired characteristics. The numerical range represented by the endpoint includes all values ​​within the range. For example, the length of the end is 4.0 to 6.0 mm, including 4.0 mm, 4.05 mm, 4.1 mm, 4.5 mm, 4.99 mm, 5.0 mm, 5.02 mm, 5.356 mm, 5.50 mm, 5.6 mm, 5.8 mm, 5.99 mm, 6.0 mm, etc.

[0033] Unless otherwise specified, the "proximal end" in this specification and claims refers to the end close to the doctor, nurse or other surgical operator during surgery, and the "distal end" refers to the end close to the patient during surgery.

[0034] The coronary sinus is an important part of the heart's circulatory system and is the only way for heart interventional treatment. Figure 1 As shown in the figure, the coronary sinus D is located in the atrioventricular groove between the left atrium and the left ventricle on the diaphragmatic surface of the heart, surrounding the left interatrial groove and adjacent to the left atrioventricular valve ring. The great cardiac vein A, the posterior left ventricular vein B, and the small cardiac vein C all originate from the apex E and converge at the coronary sinus D. The left atrial oblique vein (Marshall vein) is a small vein on the posterior wall of the left atrium, which runs obliquely along the back of the left atrium and converges into the left end of the coronary sinus. The upper end of the vein is connected to the left vena cava ligament. With the gradual promotion of new electrophysiological and cardiac intervention technologies, various different types of cardiac surgery can be provided through the coronary sinus, such as myocardial protection, targeted drug delivery, and radiofrequency ablation of arrhythmias using retrograde coronary venous perfusion during cardiac surgery. During the operation, the large variation in the opening of the coronary sinus increases the difficulty of the operation. In addition, due to the anatomical structure of the coronary vein and its thin vascular wall, it is easy to scratch the blood vessel and cause damage when establishing a pathway in the coronary sinus.

[0035] The utility model provides a guiding catheter for coronary vein surgery, aiming to improve the safety of the surgery, reduce the risk of the surgery, and shorten the surgery time.

[0036] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] like Figure 2As shown, the guiding catheter 1 comprises a base 10 and a catheter 20 connected to each other, and the catheter 20 comprises a main body 210, a transition part 220 and an end part 230 connected to each other in sequence. A handle 100 is provided on the base 10, and during surgery, the operator holds the handle 100 to allow the catheter 20 to enter the blood vessel.

[0038] like Figure 3 As shown, the transition portion 220 between the catheter body 210 and the catheter end 230 is of arc-shaped design and consists of multiple sections, including a first structure 220 (1), a second structure 220 (2), a third structure 220 (3), and a fourth structure 220 (4).

[0039] In order to allow the guiding catheter 20 to smoothly enter the blood vessel and avoid or reduce the scratching of the coronary vein by the catheter end, the inventor has designed the structure of the transition portion 220 and the end portion 230. In a specific embodiment, the length L1 of the first structure is 15 mm, the length L2 of the second structure is 7.0 mm, the length L3 of the third structure is 5.0 mm, and the length L4 of the fourth structure is 2.5 mm. The length of the end portion 230 is 5.0 mm. The transition portion 220 has a certain curvature, and its length X in the horizontal axis direction is in the range of 25.0 mm, and its length Y in the vertical axis direction is in the range of 9.0 mm.

[0040] The main body 210 and transition part 220 of the catheter 20 include a polyetheramide resin layer, a stainless steel braided layer (such as 304 stainless steel), and a polytetrafluoroethylene layer from the outside to the inside. The end 230 of the catheter 20 can be made of a polyetheramide resin layer. On the premise of ensuring a certain strength of the catheter 20, the end 230 uses a soft material to prevent scratching of the coronary vein when establishing the passage. The various parts of the catheter can be integrally formed, or they can be segmented and connected by physical or chemical means.

[0041] The catheter 20 includes at least one hollow cavity, and may also include two or three cavities. During surgery, the guiding catheter is placed in the guide sheath, a passage is established in the vein, and surgical instruments are inserted into the cavity of the catheter to perform surgery.

[0042] Compared with the prior art, the technical solution of the embodiment of the utility model has the following beneficial effects:

[0043] First, the end of the guide catheter was designed so that it could enter the blood vessel smoothly. The special curved structure made it easier to rotate the guide catheter in the coronary sinus, solving the problem of how the end of the catheter could be quickly aligned with the vein opening and shortening the operation time.

[0044] Secondly, the catheter is made of soft material, which can solve the problem of easily scratching the coronary vein when twisting the surgical instruments during coronary vein surgery, thereby improving the safety of the operation.

[0045] Although the utility model is disclosed as above, the utility model is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the utility model shall be subject to the scope defined by the claims.

Claims

1. A guiding catheter for coronary vein surgery, comprising a base and a catheter connected thereto, wherein the catheter comprises at least one hollow cavity, characterized in that: The catheter comprises: A main body connected to the base; a transition portion connected to the main body, the transition portion comprising at least one arc-shaped structure; and an end portion connected to the transition portion; The transition portion includes a first structure, a second structure and a third structure which are connected in sequence from the proximal end to the distal end; The length L1 of the first structure is in the range of 14.0 to 16.0 mm, the length L2 of the second structure is in the range of 6.0 to 8.0 mm, and the length L3 of the third structure is in the range of 4.0 to 6.0 mm.

2. The guiding catheter according to claim 1, characterized in that: The transition portion includes a fourth structure.

3. The guiding catheter according to claim 1, characterized in that: The length of the end portion is 4.0 to 6.0 mm.

4. The guiding catheter according to claim 1, characterized in that: The length of the transition portion is 27.0 to 30.0 mm.

5. The guiding catheter according to claim 2, characterized in that: The length L4 of the fourth structure is in the range of 2.0 to 3.0 mm.

6. The guiding catheter according to claim 1, characterized in that: The length X of the transition portion in the horizontal axis direction ranges from 24.0 to 26.0 mm.

7. The guiding catheter according to claim 1, characterized in that: The length Y of the transition portion in the longitudinal direction is in the range of 8.0 to 10.0 mm.

8. The guiding catheter according to claim 1, characterized in that: The main body of the catheter comprises a polyetheramide resin layer, a stainless steel braided layer and a polytetrafluoroethylene layer from the outer layer to the inner layer.

9. The guiding catheter according to claim 1, characterized in that: The end portion of the conduit includes a layer of polyetheramide resin.

Images