Threaded dilating catheter for coronary artery CTO lesion

Abstract

The utility model relates to a coronary artery CTO lesion thread dilation catheter which comprises an inner tube and a sleeve arranged on the inner tube in a sleeved mode, a guide wire is arranged in the inner tube in a penetrating mode, the head portion of the inner tube is of a conical structure, tapping threads are arranged on the outer surface of the conical structure, outer threads are arranged on the outer wall of the tail portion of the inner tube, and an adjusting knob is connected to the outer wall of the tail portion of the inner tube in a threaded mode. And the adjusting knob is rotationally mounted at the tail part of the sleeve. The inner tube head of the expansion inner tube is conical and provided with the tapping threads, so that the expansion inner tube can be screwed into a calcified lesion like a screw under the support of the sleeve, the calcified lesion is expanded through the outer diameter of the inner tube, the inner diameter of an instrument at the lesion is increased through a tube cavity or a calcified lesion ring is broken, the passing rate of the instrument is increased, and the working efficiency is improved. Surgical operation time is greatly reduced, and surgical success rate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a coronary CTO lesion threaded dilatation catheter. Background Art

[0002] Chronic total occlusion (CTO) refers to a lesion in which TIMI grade 0 blood flow in the coronary arteries persists for more than three months. CTO is known as the "last bastion" of coronary intervention. When combined with calcified lesions, CTO is the most difficult and sturdiest bastion to conquer during coronary intervention. Due to its long occlusion period, lesions within the occluded segment often have varying degrees of calcification. When calcification is severe, the plate becomes extremely "hard" and is combined with vascular tortuosity, calcification, and angulation, resulting in a very low success rate for interventional treatment, many intraoperative complications, and a high incidence of postoperative restenosis. Therefore, it is considered the greatest difficulty and challenge in the field of coronary intervention.

[0003] When the guide wire of an ordinary micro-inner tube passes through the calcified lesion, due to the hardness of the lesion plate, ordinary commonly used microcatheters and PTCA balloons cannot pass through the lesion, and the CTO guide wire cannot be replaced. Ultimately, the occluded lesion cannot be opened, resulting in surgical failure. Utility Model Content

[0004] In response to the deficiencies of the existing technology, the utility model combines many years of design and use experience in related fields, supplemented by strong professional knowledge, and designs an expansion catheter whose inner tube has a threaded metal head end, which can be screwed into the calcified lesion like a screw under the support of the sleeve, and the outer diameter of the inner tube is used to expand the calcified lesion, thereby increasing the inner diameter of the lumen for the passage of instruments at the lesion or breaking the ring of the calcified lesion, increasing the pass rate of the instrument, greatly reducing the surgical operation time, and improving the success rate of the operation.

[0005] The utility model is realized through the following technical scheme: a coronary CTO lesion threaded dilatation catheter, comprising an inner tube and a sleeve sleeved on the inner tube, wherein a guide wire is passed through the inner tube, the head of the inner tube is a conical structure and a tapping thread is provided on the conical outer surface, the outer wall of the rear end of the inner tube is provided with an external thread and is threaded with an adjustment knob, and the adjustment knob is rotatably installed at the rear end of the sleeve.

[0006] In this solution, the inner tube can be driven to move in and out along the axial direction of the casing through a threaded adjustment knob. When the inner tube is screwed in, the tapping thread on the head of the inner tube facilitates the head of the inner tube to be screwed into the calcified lesion, thereby expanding the calcified lesion, allowing the guide wire to easily pass through the calcified lesion, facilitating the replacement of the CTO guide wire, increasing the instrument pass rate, greatly reducing the surgical operation time, and improving the success rate of the operation.

[0007] As an optimization, the outer wall of the sleeve tail is provided with a convex ring along the circumference, and the inner wall of the adjustment knob is provided with a concave ring that fits with the convex ring. In this optimization solution, the adjustment knob is rotatably connected to the convex ring of the sleeve via the concave ring, enabling the adjustment knob to rotate circumferentially around the sleeve, thereby driving the inner tube to rotate in and out.

[0008] As an optimization, a metal wire braided interlayer is provided inside the tube body of the inner tube and the sleeve. The tube body of the metal wire braided interlayer of this optimization solution has good flexibility and is easy to be inserted into the coronary artery.

[0009] As an optimization, the inner wall of the rear end of the sleeve is provided with an internal thread that matches the external thread of the rear end of the inner tube. This optimization solution improves the stability of the inner tube when it is screwed in and out.

[0010] As an optimization, the inner diameter of the inner tube head end is smaller than the inner diameter of the inner tube tail end. In this optimization solution, the inner tube head is small and the tail is large, which facilitates the guide wire to move closer to the center and pass through the calcified lesion from the inner tube head end.

[0011] As an optimization, the inner diameter of the cannula head end is smaller than the inner diameter of the cannula tail end. In this optimization solution, the cannula head is small and the tail is large, so that the inner tube can be concentrated to the center when it is screwed in, which is convenient for surgical operation.

[0012] The beneficial effects of the utility model are as follows: the rotation between the inner tube and the sleeve is more stable due to the cooperation of the external thread and the internal thread, and the inner tube is rotated and moved along the axial direction of the sleeve by rotating the button, so that the tapping thread on the head of the inner tube is screwed into the calcified lesion like a screw, and the outer diameter of the inner tube is used to expand the calcified lesion, thereby increasing the inner diameter of the lumen through which the guide wire passes or breaking the ring of the calcified lesion, so that the guide wire can easily pass through the calcified lesion, facilitating the replacement of the CTO guide wire, increasing the instrument pass rate, greatly reducing the surgical operation time, and improving the success rate of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is the front view of the utility model;

[0014] Figure 2 This is a cross-sectional view of the utility model;

[0015] Figure 3 for Figure 2 A magnified view of part A;

[0016] As shown in the figure:

[0017] 1. Inner tube, 2. Cannula, 3. Guide wire, 4. Tapping thread, 5. Adjustment knob, 6. External thread, 7. Internal thread, 8. Raised ring, 9. Hemostatic seal. DETAILED DESCRIPTION

[0018] In order to clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0019] As Figures 1 to 3 shown, a screw expansion catheter for coronary CTO lesions includes an inner tube 1 and a sleeve 2 sleeved on the inner tube. A guide wire 3 is threaded through the inner tube 1. In this embodiment, the length of the inner tube 1 is 120 cm to 125 cm, the length of the sleeve 2 is 115 cm to 120 cm, and the diameter of the guide wire 3 is 0.014 inches.

[0020] The head of the inner tube 1 is a conical structure, and tapping threads 4 that can be screwed into the inside of the calcified part are provided on the outer surface of the conical shape. In this embodiment, the length of the tapping threads 4 is 15 mm. The heads and tails of the inner tube 1 and the sleeve 2 are integrally formed by metal processing, which enhances the strength of the screwing structure and facilitates threaded connection. Metal wire braided interlayers are provided inside the bodies of the inner tube 2 and the sleeve 2. In this embodiment, the heads and tails of the inner tube 1 and the sleeve 2 are integrally formed by stainless steel processing and connected to the metal wire braided interlayers inside the bodies to form an integral structure. The inside of the bodies of the inner tube and the sleeve 2 are both stainless steel wire braided interlayers, which not only ensure the strength of the body but also make the body have good flexibility. The outer surfaces of the bodies of the inner tube 1 and the sleeve 2 are PTEE coatings, which have the functions of resisting acids, alkalis, and various organic solvents.

[0021] External threads 6 are provided on the outer wall of the tail of the inner tube 1, and an adjusting knob 5 is screwed thereon. Internal threads 7 adapted to the external threads at the tail of the inner tube 1 are provided on the inner wall of the tail of the sleeve 2, and the adjusting knob 5 is rotatably installed at the tail of the sleeve 2. Specifically, the adjusting knob 5 is rotationally connected to the sleeve 2 along the circumferential direction of the sleeve, and internal threads 7 adapted to the external threads at the tail of the inner tube 1 are also provided on the inner wall of the adjusting knob 5. Preferably, an outwardly protruding ring 8 is provided on the outer wall of the tail end of the sleeve 2 along the circumferential direction, and a concave ring adapted to the ring is formed on the inner wall of the adjusting knob 5. The adjusting knob is rotationally engaged with the ring along the circumferential direction of the sleeve. By rotating the adjusting knob around the circumferential direction of the sleeve, the external threads of the inner tube are driven to screw in and out through the internal threads during rotation.

[0022] In this embodiment, the rotation direction of the inner tube 1 driven by the adjusting knob 5 is clockwise screwing in and counterclockwise screwing out. Clockwise screwing in is more in line with the operation habits of personnel and improves the convenience of use.

[0023] The inner diameter of the head end of the inner tube 1 is smaller than the inner diameter of the tail end of the inner tube, and the inner diameter of the head end of the sleeve 2 is smaller than the inner diameter of the tail end of the sleeve. Moreover, the inner diameters of the inner tube and the sleeve are gradually changed from head to tail, which is convenient for surgical operation.

[0024] To prevent blood from flowing into the inside between the sleeve 2 and the inner tube 1, a hemostatic sealing ring 9 is installed near the head of the body of the inner tube in this embodiment. The hemostatic sealing ring is located between the inner tube and the sleeve to form a sealing and hemostatic effect.

[0025] Working principle: The utility model provides a supporting effect on the inner tube 1 through the sleeve 2, enabling the inner tube 1 to perform a screwing-in motion relative to the sleeve 2. By rotating the adjustment knob 5 at the tail of the sleeve 2, the rotation of the adjustment knob 5 drives the inner tube 1 to rotate clockwise and advance along the sleeve 2. As a result, the threading 4 at the head of the inner tube 1 screws into the calcified lesion like a screw, and the outer diameter of the inner tube 1 plays a role in dilating the calcified lesion, thereby increasing the lumen inner diameter for the guiding wire to pass through or breaking the calcified lesion ring, so that the guiding wire 3 can smoothly pass through the lesion site to replace the CTO wire, greatly reducing the surgical operation time and improving the surgical success rate.

[0026] Certainly, the above description is not limited to the above examples. The technical features not described in the present utility model can be realized by or adopt the prior art, and will not be elaborated here. The above embodiments and drawings are only used to illustrate the technical solutions of the present utility model and are not a limitation to the present utility model. The present utility model has been described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that any changes, modifications, additions, or substitutions made by those of ordinary skill in the art within the scope of the essence of the present utility model do not depart from the purpose of the present utility model and should also fall within the scope of the protection of the claims of the present utility model.

Claims

1. A coronary CTO lesion threaded dilation catheter, characterized in that: It includes an inner tube (1) and a sleeve (2) sleeved on the inner tube. A guide wire (3) is inserted through the inner tube (1). The head of the inner tube (1) is a conical structure, and tapping threads (4) are provided on the outer surface of the conical shape. External threads are provided on the outer wall of the tail of the inner tube, and an adjusting knob (5) is screwed thereon. The adjusting knob (5) is rotatably installed at the tail of the sleeve (2).

2. The threaded dilation catheter for coronary CTO lesions according to claim 1, wherein: A convex ring (8) is provided on the outer wall of the tail of the sleeve (2) in the circumferential direction, and a concave ring adapted to be engaged with the convex ring (8) is formed on the inner wall of the adjusting knob (5).

3. The coronary CTO lesion threaded dilatation catheter according to claim 1, characterized in that: A metal wire braided interlayer is provided inside the tube bodies of the inner tube (1) and the sleeve (2).

4. A coronary CTO lesion screw dilation catheter according to claim 1, characterized in that: Internal threads (7) adapted to the external threads at the tail of the inner tube (1) are provided on the inner wall of the tail of the sleeve (2).

5. A coronary CTO lesion screw dilation catheter according to claim 1, characterized in that: The inner diameter of the head end of the inner tube (1) is smaller than the inner diameter of the tail end of the inner tube.

6. The coronary CTO lesion threaded dilation catheter according to claim 1, wherein: The inner diameter of the head end of the sleeve (2) is smaller than the inner diameter of the tail end of the sleeve.

Images