Snake bone pipe and conveying catheter assembly

Abstract

The utility model discloses a snake bone pipe and a conveying catheter assembly. The snake-bone pipe comprises a snake-bone pipe main body and a plurality of traction wires, a plurality of perforated hole groups are formed in the snake-bone pipe main body close to the far end, and each traction wire penetrates into an inner cavity of the snake-bone pipe main body, passes through the perforated hole groups, then penetrates back to the inner cavity of the snake-bone pipe main body and penetrates out of the inner cavity of the snake-bone pipe main body; each traction wire forms a lug boss on the outer surface of the far end of the snake bone pipe main body; the snake-bone pipe further comprises a snake-bone cap, the snake-bone cap is arranged at the far end of the snake-bone pipe body in a covering mode, a concave groove connected with the protruding part in a clamped mode is formed in the snake-bone cap, and a smooth curved surface part is formed at the near end of the snake-bone cap. The utility model has the technical effect that the snake bone cap reduces the possibility of damage caused by direct contact between the protruding part of the traction wire and the inner wall of the outer tube.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a snake tube and a delivery catheter assembly. Background Art

[0002] The human heart valves, including the tricuspid valve, pulmonary valve, mitral valve, and aortic valve, are like valves in the direction of blood flow, controlling the inflow and outflow of blood into the right atrium and right ventricle, and the left atrium and left ventricle, respectively, and preventing the reverse flow of blood.

[0003] Patients with valvular heart disease mainly suffer from valvular stenosis or regurgitation, which affects the blood flow capacity and reduces the blood delivery efficiency. In severe cases, it can be life-threatening. Currently, the surgical treatment of valvular insufficiency or stenosis is mainly achieved through transcatheter valve replacement surgery. Transcatheter valve replacement surgery mainly refers to compressing the valve prosthesis into the tube at the distal end of the delivery system, and then delivering the distal end of the delivery system to the human valve ring through the artery or vein. The valve prosthesis is then released and fixed at the surgical site through the handle of the delivery system.

[0004] The delivery catheter for delivering valve prosthesis is a controllable bending component. The bending angle of the delivery catheter can be controlled by the operator. The main components for achieving bending and swinging are the snake tube and the traction wire. By pulling the traction wire, the snake is driven to swing. The snake tube is usually composed of several identical unit sections. Adjacent unit sections can be bent with each other. The superposition of the bending effects of several unit sections can realize the bending of the entire snake tube in a certain direction to achieve the required purpose, such as accurate detection and observation of human body parts.

[0005] In the prior art, after the traction wire is inserted into the snake-bone tube, a partial protrusion will be formed on the outer surface of the snake-bone tube at the proximal end of the fixed steel wire of the snake-bone tube due to the hardness of the wire rope itself. The protruding portion not only increases the diameter of the overall snake-bone tube, but also the hardness of the wire rope is too high. The protruding portion will damage the inner wall of the tube outside the snake-bone tube during the use of the snake-bone tube, thereby destroying the user experience of the snake-bone tube, and the quality problem cannot be guaranteed. Utility Model Content

[0006] The utility model aims to provide a snake bone tube, which has the advantages that the snake bone cap reduces the possibility of damage caused by direct contact between the protruding part of the traction wire and the inner wall of the outer tube.

[0007] The above technical objectives of the utility model are achieved through the following technical solutions: a snake bone tube, comprising a snake bone tube body and a plurality of traction wires, wherein the snake bone tube body is provided with a plurality of perforation groups near the distal end, each of the traction wires passes through the inner cavity of the snake bone tube body, passes through the perforation groups, and then passes back to the inner cavity of the snake bone tube body, and then passes out from the inner cavity of the snake bone tube body; each of the traction wires forms a convex portion on the outer surface of the distal end of the snake bone tube body;

[0008] The snake bone tube also includes a snake bone cap, which is arranged at the distal end of the snake bone tube body. A recessed groove engaged with the raised portion is provided in the snake bone cap, and a smooth curved portion is formed at the proximal end of the snake bone cap.

[0009] In some embodiments: a one-way snap-fit ​​structure is provided in the recessed groove to restrict the protrusion from being removed from the recessed groove.

[0010] In some embodiments: the one-way snap-fit ​​structure includes two inclined plates; the two inclined plates are symmetrically arranged on the inner wall of the recessed groove and close to the opening of the recessed groove, a gap is arranged between the two inclined plates and they are inclined toward the inside of the recessed groove to form a snap-fit ​​with a gradually decreasing diameter.

[0011] In some embodiments: the distal end of the snake bone cap is configured to have a rounded structure.

[0012] In some embodiments, the number of the perforation groups is two, and each of the perforation groups includes two through holes that are spaced a predetermined distance apart and penetrate the snake tube body.

[0013] In some embodiments: the two perforation groups are symmetrically arranged on both sides of the snake bone cap.

[0014] In some embodiments: two limit grids are provided on the inner wall of the serpentine tube body, the positions of the two limit grids correspond to the positions of the two perforation groups, and each limit grid is used to define a passage for the traction wire inside the serpentine tube body.

[0015] In some embodiments: the minimum inner diameter of the recessed groove is smaller than the inner diameter of the snake tube body.

[0016] In some embodiments: the end surface of the snake bone cap close to the snake bone tube body is provided with an avoidance groove that can avoid the inner cavity structure of the snake bone tube body, and the avoidance groove is located in the inner ring area of ​​the recessed groove.

[0017] According to another aspect of the present application, a delivery catheter assembly is provided, comprising an outer tube, and also comprising a snake tube as described in any one of the above items; the proximal end of the snake tube is connected to a claw seat, and the proximal end of the claw seat is used to connect to a valve prosthesis.

[0018] In summary:

[0019] 1. Pass the traction wire through the hole in the main body of the snake bone tube, and fix the traction wire on the snake bone tube. A bulge is formed at the place where the traction wire passes through the hole. Cover the proximal end of the snake bone tube with a snake bone cap, and insert the bulge into the recessed groove. Then, the snake bone cap covers the protruding part of the traction wire. When the snake bone tube is extended into the tube body where it is located, the tube body is bent. The smooth curved surface of the snake bone cap can adaptively contact with the inner wall of the tube body during the bending process of the tube body, so as to avoid the contact between the sharp edges or bulges of the snake bone tube itself and the inner wall of the tube body, thereby reducing the possibility of damage caused by direct contact between the protruding part of the traction wire and the inner wall of the outer tube.

[0020] 2. The setting of the buckle enables the convex part to enter the concave groove after the snake bone tube body is inserted into the snake bone cap and be stuck by the buckle, so that the snake bone tube body can no longer be taken out in reverse, thereby improving the stability between the snake bone tube body and the snake bone cap. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the connection structure between the snake bone tube body and the snake bone cap of this embodiment;

[0022] Figure 2 is a schematic diagram of the connection structure between the drawing wire and the perforation in this embodiment;

[0023] Figure 3 This is a schematic diagram of the separate structure of the snake bone tube body and the snake bone cap of this embodiment;

[0024] Figure 4 This is a schematic diagram of the structure of the snake bone tube body and the snake bone cap combined in this embodiment;

[0025] Figure 5 This is a schematic diagram of the overall structure of the snake bone cap of this embodiment;

[0026] Figure 6 is a cross-sectional view of the snake bone cap of this embodiment;

[0027] Figure 7 is a schematic diagram of the connection structure between the protrusion and the buckle of this embodiment;

[0028] Figure 8 A diagram showing a state where the snake tube is placed inside the outer tube in some usage scenarios;

[0029] Fig. 9 The diagram shows the bending state of the snake tube placed in the outer tube in some usage scenarios;

[0030] Fig.10 A schematic diagram showing the contact between the snake tube and the inner wall of the outer tube in some usage scenarios is shown;

[0031] Fig.11 The diagram shows the actual bending state of the snake tube placed inside the outer tube in some usage scenarios;

[0032] Fig.12 The figure is a schematic diagram of the overall structure of an outer tube in the prior art.

[0033] Figure numerals: 1. snake bone tube body; 2. perforation group; 3. traction wire; 4. raised portion; 5. snake bone cap; 6. recessed groove; 7. buckle; 8. avoidance groove; 9. limit grid; 10. outer tube; 11. valve prosthesis; 12. claw seat; 13. snake bone tube; 101. PTFE layer; 102. metal layer; 103. Pebax layer. DETAILED DESCRIPTION

[0034] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0035] In some snake tube usage scenarios, see Figure 8-Figure 12 The snake tube is placed in an outer tube 10, and a claw seat is arranged at the distal end of the snake tube, and the claw seat can be close to or away from the snake tube along the axis of the outer tube. The valve prosthesis 11 is installed on the claw seat, and the valve prosthesis 11 can be gradually released when the outer tube 10 gradually moves toward the distal direction (the right direction when looking at the paper).

[0036] The working process and working status of the snake tube in this scenario are described in detail below.

[0037] Initial state: The snake tube is placed in the outer tube 10, see Figure 8 The valve prosthesis 11, the claw seat 12 and the snake tube 13 are arranged in the outer tube 10, and the outer tube 10 is arranged in a straight line.

[0038] During the process of transporting the valve prosthesis 11, the snake tube 13 is bent under the action of the traction wire 3. Fig. 9 As shown, the outer tube 10 is bent driven by the snake tube 13. The bending of the outer tube 10 enables the valve prosthesis 11 to change direction.

[0039] After the valve prosthesis 11 reaches the predetermined position, the outer tube 10 is withdrawn to slowly release the valve prosthesis 11. Fig.10 .

[0040] In the actual bending process, the proximal end of the snake tube 13 will come into contact with the inner wall of the outer tube 10. Fig.11 The part in the middle circle is the protrusion on the outer surface of the proximal end of the snake bone tube 13 (see Figure 2 ) will produce friction with the inner wall of the outer tube 10. Fig.12The structure diagram of an outer tube 10 in the prior art is shown. The outer tube 10 includes a three-layer structure, including a PTFE (polytetrafluoroethylene) layer 101, a metal layer 102, and a Pebax (nylon elastomer) layer 103. After the protrusion rubs against the inner wall of the outer tube 10, the innermost PTFE layer 101 in the outer tube 10 is easily damaged by the protrusion. After the PTFE layer 101 is damaged, the proximal end of the snake tube 13 will directly touch the metal layer 102 of the outer tube 10. The metal layer 102 is a functional layer of the outer tube 10, which is used to bend with the snake tube 13 while providing a certain supporting force. After the metal layer is damaged, the supporting force of the outer tube 10 is damaged, thereby affecting the bending and strength of the outer tube 10.

[0041] Meanwhile, when the release position of the valve is inaccurate, the valve prosthesis 11 needs to be recovered into the outer tube 10 and released again. During the recovery of the valve prosthesis 11, the damaged inner wall of the outer tube 10 will scratch the outer surface of the valve, which may make the valve prosthesis 11 unusable in severe cases.

[0042] In order to avoid the above situation, the present application provides a snake tube 13 that can prevent the inner wall of the outer tube 10 from being damaged.

[0043] Refer to Figure 1-7 As shown, a snake bone tube comprises a snake bone tube body 1 and a plurality of traction wires 3. A plurality of perforation groups 2 are provided near the distal end of the snake bone tube body 1. Each traction wire 3 passes through the inner cavity of the snake bone tube body 1 and then passes back to the inner cavity of the snake bone tube body 1 after passing through the perforation group 2, and then passes out from the inner cavity of the snake bone tube body 1; each traction wire 3 forms a convex portion 4 on the outer surface of the distal end of the snake bone tube body 1; the snake bone tube further comprises a snake bone cap 5, which is covered at the distal end of the snake bone tube body 1, and a concave groove 6 is provided in the snake bone cap 5 to be engaged with the convex portion 4, and a smooth curved portion is formed at the proximal end of the snake bone cap 5;

[0044] Specifically, the traction wire 3 passes through the through hole 2 in the snake bone tube body 1, and the traction wire 3 is fixed on the snake bone tube. A protrusion 4 is formed at the place where the traction wire 3 passes through the through hole 2. The snake bone cap 5 is covered on the proximal end of the snake bone tube, and the protrusion 4 is inserted into the recessed groove 6, and then the snake bone cap 5 covers the protruding part of the traction wire 3, and the snake bone tube is extended into the outer tube 10, and the outer tube 10 is bent. The smooth curved surface of the snake bone cap 5 can adaptively contact with the inner wall of the outer tube 10 during the bending process of the outer tube 10. Compared with the protrusion 4 formed by the traction wire 3 or the snake bone cap 5 with sharp edges and corners, the snake bone cap 5 in the present application can reduce the friction with the inner wall of the outer tube 10, thereby avoiding the possibility of damage caused by the direct contact of the snake bone tube with the inner wall of the outer tube 10.

[0045] In some embodiments, a one-way buckle 7 structure is provided in the recessed groove 6 to limit the removal of the protrusion 4 from the recessed groove 6, and the one-way buckle 7 structure includes two inclined plates; the two inclined plates are symmetrically arranged on the inner wall of the recessed groove 6 and close to the opening of the recessed groove 6, and a gap is set between the two inclined plates and they are inclined toward the inside of the recessed groove 6 to form a buckle 7 with a gradually decreasing diameter. The snake bone cap 5 is provided with a one-way buckle 7, so that after the snake bone is inserted into the snake bone cap 5, the protruding traction wire 3 cooperates with the buckle 7 and cannot be taken out in the reverse direction, thereby ensuring the stability of the cooperation between the snake bone cap 5 and the snake bone.

[0046] In some embodiments, the distal end of the snake bone cap 5 is set to a chamfered structure, and the proximal end of the snake bone cap 5 is chamfered, which solves the problem of sharp edges and corners of the snake bone tube itself due to wall thickness problems. When it is bent in conjunction with other pipelines, it plays a role in reducing friction, and the sharp proximal end may cause damage to the outer pipeline.

[0047] In some embodiments, there are two perforation groups 2, each perforation group 2 includes two through holes spaced a predetermined distance apart and penetrating the snake bone tube body 1, and the two perforation groups 2 are symmetrically arranged on both sides of the snake bone cap 5, and the perforation groups 2 play a limiting role on the traction wire 3.

[0048] In some embodiments, two limit grids 9 are provided on the inner wall of the serpentine tube body 1, and the positions of the two limit grids 9 correspond to the positions of the two perforation groups 2. Each limit grid 9 is used to define a passage for the traction wire 3 inside the serpentine tube body 1. The limit grid 9 guides and limits the traction wire 3, so that the traction wire 3 can pass through the perforation group 2 better.

[0049] In some embodiments, the minimum inner diameter of the recessed groove 6 is smaller than the inner diameter of the snake bone tube body 1 , so that the snake bone tube body 1 can be embedded in the recessed groove 6 .

[0050] In some embodiments, the end face of the snake bone cap 5 close to the snake bone tube body 1 is provided with an avoidance groove 8 that can avoid the inner cavity structure of the snake bone tube body 1. The avoidance groove 8 is located in the inner ring area of ​​the recessed groove 6. The avoidance groove 8 and the inner cavity of the snake bone tube body 1 cooperate with each other to improve the connection tightness between the snake bone cap 5 and the snake bone tube body 1.

Claims

1. A snake bone tube, comprising a snake bone tube body (1) and a plurality of traction wires (3), characterized in that: The main body (1) of the snake bone tube is provided with a plurality of perforation groups (2) near the distal end. Each of the traction wires (3) passes through the inner cavity of the main body (1) of the snake bone tube and then passes through the perforation group (2) and then passes back into the inner cavity of the main body (1) of the snake bone tube and then passes out of the inner cavity of the main body (1). Each of the traction wires (3) forms a protrusion (4) on the outer surface of the distal end of the main body (1). The snake bone tube also includes a snake bone cap (5), which is arranged at the distal end of the snake bone tube body (1), and a recessed groove (6) is provided in the snake bone cap (5) for engaging with the raised portion (4), and a smooth curved portion is formed at the proximal end of the snake bone cap (5).

2. The snake bone tube according to claim 1, characterized in that: A one-way snap-fit ​​structure is provided in the recessed groove (6) to restrict the protruding portion (4) from being removed from the recessed groove (6).

3. The snake bone tube according to claim 2, characterized in that: The one-way buckle structure comprises two inclined plates; the two inclined plates are symmetrically arranged on the inner wall of the recessed groove (6) and close to the opening of the recessed groove (6); a gap is provided between the two inclined plates and they are inclined toward the inside of the recessed groove (6) to form a buckle (7) with a gradually decreasing diameter.

4. The snake bone tube according to any one of claims 1 to 3, characterized in that: The distal end of the snake bone cap (5) is configured as a rounded structure.

5. The snake bone tube according to claim 4, characterized in that: The number of the perforation groups (2) is two, and each of the perforation groups (2) comprises two through holes which are spaced at a predetermined distance and penetrate the snake tube body (1).

6. The snake bone tube according to claim 5, characterized in that: The two perforation groups (2) are symmetrically arranged on both sides of the snake bone cap (5).

7. The snake bone tube according to claim 6, characterized in that: Two limit grids (9) are provided on the inner wall of the serpentine tube body (1), the positions of the two limit grids (9) correspond to the positions of the two perforation groups (2), and each limit grid (9) is used to define a passage for the traction wire inside the serpentine tube body (1).

8. The snake bone tube according to claim 7, characterized in that: The minimum inner diameter of the recessed groove (6) is smaller than the inner diameter of the snake bone tube body (1).

9. The snake bone tube according to claim 8, characterized in that: The end surface of the serpentine cap (5) close to the serpentine tube body is provided with an avoidance groove (8) capable of avoiding the inner cavity structure of the serpentine tube body (1), and the avoidance groove (8) is located in the inner ring area of ​​the recessed groove (6).

10. A delivery catheter assembly, comprising an outer tube and a claw seat for connecting a valve prosthesis, characterized in that: It also includes a serpentine tube as described in any one of claims 1 to 9; the claw seat is configured to be located on one side of the distal end of the serpentine tube and able to approach or move away from the distal end of the serpentine tube along the axis of the outer tube inside the outer tube; the valve prosthesis is connected to the distal end of the claw seat.

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