Ball head locking mechanism of basket catheter and basket catheter

Abstract

The present invention discloses a ball head locking mechanism of a basket catheter and a basket catheter, and relates to the technical field of medical devices, wherein the ball head locking mechanism includes a ball head screw, a ball head screw sleeve and a restraining ring, wherein the ball head screw is threadedly connected to the inner side of the ball head screw sleeve, and the outer wall of the ball head screw sleeve is a ramp structure. The present invention screws the ball head screw and the ball head screw sleeve with threaded matching together, and relies on the restraining ring to effectively press the end of the nickel-titanium sheet of the basket structure on the ramp structure, thereby achieving effective locking and avoiding the risk of falling off caused by glue bonding. In addition, the ball head screw sleeve can also take the form of a combination of an expansion ring and an extrusion screw sleeve. When the ball head screw and the extrusion screw sleeve are relatively rotated and tightened, the ball head screw and the extrusion screw sleeve can also jointly extrude the expansion ring, so that the expansion ring expands outward, which is convenient for pressing the nickel-titanium sheet, further assisting in locking the nickel-titanium sheet, and ensuring the locking effect.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, and in particular to a ball head locking mechanism of a basket catheter and the basket catheter. Background Art

[0002] In recent years, catheter therapy has been widely used in the treatment of various diseases. For example, once the catheter reaches the desired location, the treatment can be performed using the corresponding technology. The distal end of the catheter used in the prior art is designed in a variety of different forms, and the basket catheter is one of them.

[0003] In the prior art, the basket structure of the basket catheter is generally cut from nickel-titanium wire or nickel-titanium sheet, and the nickel-titanium sheet at the far end of the basket is bonded and fixed to the metal column at the head end by gluing.

[0004] The disadvantage of the nickel-titanium sheet fixing structure of the existing basket catheter is that after the nickel-titanium sheet of the existing basket catheter is fixed by gluing, it will be soaked in blood during use, which will easily lead to the failure of the glue, thus causing the parts to loosen and enter the human body, thus having a huge impact on life and health. Therefore, the basket catheter product needs a safe basket distal fixation method. Summary of the invention

[0005] The purpose of the present invention is to provide a ball head locking mechanism for a basket catheter and a basket catheter, so as to solve the technical problem in the prior art that the nickel-titanium sheet end of the basket catheter is easily failed and falls off after being fixed by gluing, thus causing danger to the patient.

[0006] The technical problem to be solved by the present invention can be achieved by the following technical solutions:

[0007] A ball head locking mechanism for a basket catheter, comprising:

[0008] A ball screw and a ball screw sleeve, wherein the ball screw is threadedly connected to the inner side of the ball screw sleeve, and the outer wall of the ball screw sleeve is a slope structure;

[0009] A restraining ring, which is arranged on the outside of the ball head screw, and cooperates with the ramp structure to lock the end of the nickel-titanium sheet;

[0010] As a further solution of the present invention: the ball head screw is a hollow structure, comprising a screw portion and a ball head portion fixedly arranged at one end of the screw portion, one side of the restraining ring is fixedly connected to the ball head portion of the ball head screw, and a gap is provided between the restraining ring and the ramp structure for accommodating the end of the nickel-titanium sheet.

[0011] As a further solution of the present invention: the ball head screw sleeve includes an expansion ring and an extrusion screw sleeve, the ball head screw is threadedly connected to the extrusion screw sleeve, the expansion ring is fitted between the ball head of the ball head screw and the extrusion screw sleeve, and the ball head of the ball head screw and the extrusion screw sleeve move towards each other to extrude the expansion ring.

[0012] As a further solution of the present invention: the expansion ring is made of medical silicone.

[0013] As a further solution of the present invention: a side of the expansion ring close to the extrusion screw sleeve is provided with an inverted slope shape, and a side of the extrusion screw sleeve close to the expansion ring is provided with an arc chamfer that cooperates with the inverted slope shape.

[0014] As a further solution of the present invention: after the screw portion of the ball screw is assembled with the ball screw sleeve thread, the D position spacing between the restraining ring and the ramp structure is 0.15 mm, and the positive and negative errors are 0.02 mm.

[0015] As a further solution of the present invention: the angle between the two waists of the cross section of the ball screw sleeve is set to 6°, and the positive and negative errors are 0.3°.

[0016] As a further solution of the present invention: a plurality of grooves for positioning the nickel-titanium sheet are circumferentially distributed on the outer wall of the ball screw sleeve.

[0017] As a further solution of the present invention: the depth of the groove used to position the nickel-titanium sheet is no more than 0.05 mm.

[0018] Beneficial effects of the present invention:

[0019] 1. The present invention screws together a ball screw and a ball screw sleeve with threaded matching, and relies on a restraining ring to effectively press the end of the nickel-titanium sheet of the basket structure onto the slope structure, thereby achieving effective locking and avoiding the risk of falling off caused by glue bonding.

[0020] 2. The ball screw sleeve of the present invention can also take the form of a combination of an expansion ring and an extrusion screw sleeve. When the ball screw and the extrusion screw sleeve are relatively rotated and tightened, the ball screw and the extrusion screw sleeve can also jointly extrude the expansion ring, causing the expansion ring to expand outward, making it easier to press the nickel-titanium sheet, further assisting in locking the nickel-titanium sheet, and ensuring the locking effect.

[0021] 3. The minimum distance between the slope structure and the restraint ring of the present invention is designed according to the thickness of the end of the nickel-iron sheet of the basket structure on the market to avoid the breakage of the nickel-titanium sheet due to over-tightening. At the same time, the angle of the slope structure is set to 6°, which is suitable for the distribution and locking of the nickel-titanium sheets. The design of the slope structure makes the nickel-titanium sheets that make up the basket-shaped structure evenly distributed, and avoids the nickel-titanium sheets from being concave when tightened, which affects the balloon equipped with the existing basket catheter. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 yes Figure 1 A schematic diagram of the enlarged structure at A in the middle;

[0025] Figure 3 It is a schematic diagram of the structure of the ball screw sleeve in the present invention using an expansion ring and an extrusion screw sleeve;

[0026] Figure 4 yes Figure 3 A schematic diagram of the enlarged structure at B in the middle;

[0027] Figure 5 It is a schematic diagram of the structure of the nickel-titanium sheet in the present invention that does not become concave after being tightened;

[0028] Figure 6 It is a schematic diagram of the structure of the nickel-titanium sheet in the present invention that is concave after being tightened;

[0029] Figure 7 It is a schematic diagram of the structure of the expansion ring in the present invention;

[0030] Figure 8 It is a structural schematic diagram of the extrusion screw sleeve in the present invention;

[0031] Fig. 9 It is a structural schematic diagram of the ball head screw sleeve in the present invention;

[0032] Fig.10 yes Figure 2 Schematic diagram of the enlarged structure at point C in the middle.

[0033] In the figure: 1. Guide wire tube; 2. PEEK tube; 3. Balloon; 4. Nickel-titanium sheet; 5. Restraint ring; 6. Ball screw sleeve; 7. Ball screw; 8. Expansion ring; 9. Extrusion screw sleeve; 10. Slope structure; 11. Inverted slope shape; 12. Arc chamfer. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] like Figure 1-Figure 10As shown, a ball head locking mechanism of a basket catheter is used to lock the end of a nickel-titanium sheet 4 of a basket structure in the basket catheter, wherein the basket structure includes a plurality of nickel-titanium sheets 4 distributed circumferentially, the ball head locking mechanism includes a ball head screw 7, a ball head screw sleeve 6 and a restraining ring 5, the ball head screw 7 is inserted into the inner side of the ball head screw sleeve 6 and is threadedly connected with the ball head screw sleeve 6, the ball head screw 7 and the ball head screw sleeve 6 are made of 316 stainless steel, the outer wall of the ball head screw sleeve 6 is a ramp structure 10, that is, the ball head screw 7 and the ball head screw sleeve 6 can be relatively rotated to cause relative displacement between the two, the restraining ring 5 is arranged on the outer side of the ball head screw 7, and the restraining ring 5 cooperates with the ramp structure 10 to lock the end of the nickel-titanium sheet 4 of the basket structure;

[0036] Among them, the restraint ring 5 and the ball head screw 7 are specifically configured as follows: the ball head screw 7 is a hollow structure, including a screw part and a ball head fixedly arranged at one end of the screw part, one side of the restraint ring 5 is fixedly connected to the ball head of the ball head screw 7, and there is a gap between the inner wall of the restraint ring 5 and the ramp structure 10, which is used to accommodate the end of the nickel-titanium sheet 4, and the ball head screw 7 is rotated and moved relative to the ball head screw sleeve 6, driving the restraint ring 5 to fix and press the end of the nickel-titanium sheet 4 on the ball head screw sleeve 6.

[0037] And due to the setting of the slope structure 10, when the nickel-titanium sheet 4 is tightened, the nickel-iron sheet 4 can be prevented from Figure 6 The concave condition shown can be achieved as follows Figure 5 The state shown can effectively prevent the nickel-iron sheet 4 from being worn by the contact with the balloon 3 provided in the basket catheter in this state.

[0038] In some specific embodiments, in order to further lock the nickel-titanium sheet 4 of the basket structure, Figure 3 and Figure 4 As shown, the ball head screw sleeve 6 includes an expansion ring 8 and an extrusion screw sleeve 9, and the ball head screw 7 is threadedly connected to the extrusion screw sleeve 9. In this embodiment, the outer wall of the extrusion screw sleeve 9 is set to a ramp structure 10, and the expansion ring 8 is fitted between the ball head of the ball head screw 7 and the extrusion screw sleeve 9, and the inner ring of the expansion ring 8 fits the screw part of the ball head screw 7. The expansion ring 8 is made of medical silicone. The ball head of the ball head screw 7 and the extrusion screw sleeve 9 move toward each other to extrude the expansion ring 8, so that it deforms and expands outward. When the nickel-titanium sheet 4 is locked by the combined action of the ramp structure 10 and the restraining ring 5, the expansion ring 8 that expands outward can be relied on to further assist in extrusion and locking to ensure effective locking.

[0039] In other specific embodiments, in order to facilitate the ball screw 7 and the extrusion screw sleeve 9 to effectively produce an extrusion effect on the expansion ring 8, the expansion ring 8 is combined with the ball screw 7 and the extrusion screw sleeve 9. Figure 4 , Figure 7 and Figure 8As shown, a reverse slope shape 11 is provided on one side of the expansion ring 8 close to the extrusion screw sleeve 9, and a circular arc chamfer 12 which cooperates with the reverse slope shape 11 is provided on one side of the extrusion screw sleeve 9 close to the expansion ring 8. By providing the reverse slope shape 11 and the circular arc chamfer 12, it is convenient for the extrusion screw sleeve 9 to extrude the expansion ring 8 to expand outward.

[0040] In some specific implementation schemes, since the thickness of most of the nickel-titanium sheets 4 of the basket structure on the market is 0.2 mm, with a positive and negative error of 0.03 mm, and the nickel-titanium sheet 4 can be squeezed and deformed to a certain extent, after the screw portion of the ball screw 7 and the ball screw sleeve 6 are threaded together and tightened, the distance between the restraining ring 5 and the ramp structure 10 at position D is 0.15 mm, with a positive and negative error of 0.02 mm. Here, position D is the minimum distance between the restraining ring 5 and the ramp structure 10, and is also the optimal distance. Fig.10 As shown, the restraining ring 5 and the ramp structure 10 can cooperate to squeeze the nickel-titanium sheet 4, causing it to deform to a certain extent, thereby achieving the purpose of "locking" and locking without causing the nickel-titanium sheet 4 to break due to over-tightening.

[0041] Furthermore, in order to effectively clamp the nickel-titanium sheet 4 and form a uniform basket structure after clamping, as Fig. 9 As shown, since the outer wall of the ball screw sleeve 6 is set as a slope structure 10, the cross-section of the ball screw sleeve 6 is a trapezoidal surface, and the angle between the two waists of the cross-section of the ball screw sleeve 6 is set to 6°, with a positive and negative error of 0.3°. In this way, when the basket catheter is used up and needs to be tightened from the expanded ball shape to bulk and stored in the sheath, this angle setting is conducive to the nickel-titanium sheet to form a straight state for storage.

[0042] It should be noted that when the angle of the slope structure 10 is set to 1° in the test, the nickel-titanium sheet 4 of the basket structure is unevenly distributed, and the nickel-titanium sheet 4 is concave when tightened, which is easy to affect the balloon 3. Figure 6 shown.

[0043] In some specific embodiments, the outer wall of the ball head screw sleeve 6 is circumferentially distributed with multiple grooves for positioning the nickel titanium sheet 4, so that when the nickel titanium sheet 4 is installed, the end portion can be directly positioned and inserted into the groove at the corresponding position, which is convenient for quick positioning and installation.

[0044] It should be noted that the depth of the above groove is not greater than 0.05 mm to avoid the groove being too deep to affect the fixing effect of the nickel-titanium sheet 4.

[0045] A basket catheter may include the ball head locking mechanism of any of the above-mentioned embodiments, and also includes a guide wire tube 1, a balloon 3 and a PEEK tube 2, wherein the PEEK tube 2 is a polyetheretherketone material tube, the guide wire tube 1 is inserted into the PEEK tube 2, the two are fixedly arranged, and the guide wire tube 1 can slide relative to the original sheath tube, the end of the PEEK tube 2 is fixedly connected to the inner side of the ball head screw 7, and the balloon 3 is sleeved on the outside of the PEEK tube 2 and is fixed relative to the PEEK tube 2.

[0046] In order to facilitate the understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution is briefly described in combination with specific application scenarios:

[0047] First, the nickel-titanium sheet 4 of the basket structure is distributed circumferentially on the ramp structure 10 outside the ball screw sleeve 6, and then the ball screw sleeve 6 and the threaded ball screw 7 are made to rotate relative to each other. The ball screw 7 causes the restraining ring 5 to squeeze the end of the nickel-titanium sheet 4 on the ramp structure 10, thereby pressing and locking it.

[0048] Since the thickness of most of the nickel-titanium sheets 4 with basket structures on the market is 0.2mm, with a positive and negative error of 0.03mm, and the nickel-titanium sheet 4 can be squeezed and deformed to a certain extent, the spacing between the side of the restraining ring 5 away from the ball head of the ball head screw 7 and the ramp structure 10 is set to 0.15mm, with a positive and negative error of 0.02mm, which is the minimum spacing between the restraining ring 5 and the ramp structure 10. When the two ends of the screw part of the ball head screw 7 are respectively flush with the two ends of the ball head screw sleeve 6, the restraining ring 5 and the ramp structure 10 cooperate to extrude the nickel-titanium sheet 4, causing it to deform to a certain extent, thereby achieving the purpose of "stuck" and locking without causing the nickel-titanium sheet 4 to break due to over-tightening; at the same time, the angle between the ramp structures 10 on both sides of the ball head screw sleeve 6 is set to 6°, with a positive and negative error of 0.3°, which can effectively prevent the nickel-titanium sheet 4 from being concave and facilitate the uniform distribution of the nickel-titanium sheet 4.

[0049] The ball head screw sleeve 6 can also be composed of an expansion ring 8 and an extrusion screw sleeve 9. The ball head screw 7 and the extrusion screw sleeve 9 are threadedly connected. The two move toward each other to extrude the expansion ring 8, causing it to deform and expand outward. When the nickel-titanium sheet 4 is locked by the combined action of the ramp structure 10 and the restraining ring 5, the expansion ring 8 that expands outward can be relied upon to further assist in extrusion and locking to ensure effective locking.

[0050] Several embodiments of the present invention are described in detail above, but the embodiments of the present invention are not limited thereto and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A ball head locking mechanism for a basket catheter, characterized in that: include: A ball screw (7) and a ball screw sleeve (6), wherein the ball screw (7) is threadedly connected to the inner side of the ball screw sleeve (6), and the outer wall of the ball screw sleeve (6) is a slope structure (10); A restraining ring (5), wherein the restraining ring (5) is arranged on the outside of the ball head screw (7), and the restraining ring (5) cooperates with the ramp structure (10) to lock the end of the nickel-titanium sheet (4); The angle between the slope structures (10) on both sides of the cross section of the ball screw sleeve (6) is set to 6°, with a positive and negative error of 0.3°; A plurality of grooves for positioning the nickel-titanium sheet (4) are circumferentially distributed on the outer wall of the ball screw sleeve (6).

2. The ball head locking mechanism of the basket catheter according to claim 1, characterized in that: The ball head screw (7) is a hollow structure, and comprises a screw portion and a ball head portion fixedly arranged at one end of the screw portion; one side of the restraining ring (5) is fixedly connected to the ball head portion of the ball head screw (7); and a gap for accommodating an end of the nickel-titanium sheet (4) is provided between the restraining ring (5) and the ramp structure (10).

3. The ball head locking mechanism of the basket catheter according to claim 2, characterized in that: The ball screw sleeve (6) comprises an expansion ring (8) and an extrusion screw sleeve (9); the ball screw (7) is threadedly connected to the extrusion screw sleeve (9); the expansion ring (8) is fitted between the ball head of the ball screw (7) and the extrusion screw sleeve (9); the ball head of the ball screw (7) and the extrusion screw sleeve (9) move towards each other to extrude the expansion ring (8).

4. The ball head locking mechanism of the basket catheter according to claim 3, characterized in that: The expansion ring (8) is made of medical silicone.

5. The ball head locking mechanism of the basket catheter according to claim 3, characterized in that: A side of the expansion ring (8) close to the extrusion screw sleeve (9) is provided with an inverted slope shape (11), and a side of the extrusion screw sleeve (9) close to the expansion ring (8) is provided with an arc chamfer (12) that cooperates with the inverted slope shape (11).

6. The ball head locking mechanism of the basket catheter according to claim 2, characterized in that: After the screw portion of the ball screw (7) and the ball screw sleeve (6) are tightened into place, the minimum spacing D between the restraining ring (5) and the ramp structure (10) is 0.15 mm, and the positive and negative errors are 0.02 mm.

7. The ball head locking mechanism of the basket catheter according to claim 1, characterized in that: The depth of the groove used to position the nickel-titanium sheet (4) is no greater than 0.05 mm.

8. A basket catheter, characterized in that: A ball head locking mechanism for a basket catheter comprising the method described in any one of claims 1 to 7.

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