Vascular dilation device

Abstract

The invention relates to a blood vessel dilatation device which comprises an outer tube, a balloon connected to the far end of the outer tube, grasping forceps arranged in the balloon and a handle connected to the near end of the outer tube, the balloon is provided with a shaping area and a deformation area, and the deformation area comprises a plurality of flaps distributed in the circumferential direction of the shaping area. The plurality of petals are hinged to the shaping area and operably rotate in the direction away from or close to the axis of the balloon, so that the balloon can be switched between an expanded state and a closed state; the grasping forceps are arranged in the balloon in a sliding mode in the axial direction of the balloon and have a clamping state and a loosening state. The balloon is a mechanical balloon which can be controlled to be opened and closed, has larger supporting force in an expansion state, and has a better treatment effect on calcified stenosis; in addition, grasping forceps are further arranged in the balloon and can move according to requirements, so that pathological tissues or foreign matters on the inner side and the outer side of the balloon are grasped.

Description

Technical Field

[0001] The invention belongs to the technical field of medical devices, and in particular relates to a vascular dilation device. Background Art

[0002] Balloon dilatation interventional therapy is an interventional treatment method and a common method for treating vascular stenosis. The traditional balloon is a filling type thin film balloon, which is placed in the narrow part of the blood vessel and expanded to expand the narrow part of the blood vessel, squeezing out the plaque formed in the narrow part, thereby achieving the purpose of dilating the blood vessel.

[0003] For calcified stenosis, a greater squeezing force is required, which means that more filling medium needs to be filled into the balloon. However, since the wall of the film balloon is very thin, its tear resistance and bursting pressure are limited, and filling too much filling medium will cause the balloon to burst. Even if it does not burst, the squeezing effect on the calcified plaque is not good because the balloon wall is flexible. Therefore, the film balloon is not effective in treating calcified stenosis. Summary of the invention

[0004] The purpose of the present invention is to provide a novel vascular dilation device, which has a better treatment effect on calcified stenosis.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] The present invention provides a vascular dilation device, comprising:

[0007] External pipe;

[0008] A balloon, the balloon having a shaped area and a deformable area, the shaped area being connected to the distal end of the outer tube, the deformable area comprising a plurality of flaps arranged along the circumference of the shaped area, the plurality of flaps being hinged on the shaped area and operable to rotate in a direction away from or close to the axis of the balloon, so that the balloon can be switched between an expanded state and a closed state;

[0009] A grasping forceps, which is slidably disposed in the balloon along the axial direction of the balloon and has a clamping state and a loosening state;

[0010] The handle includes a shell connected to the proximal end of the outer tube, a balloon opening and closing drive component arranged on the shell and configured to drive the balloon to expand or close, and a grasping forceps drive component configured to make the grasping forceps slide and / or drive the grasping forceps to switch between a clamped state and a released state.

[0011] The balloon of the present invention has a plurality of rotatable flaps, and the balloon can be expanded and closed by controlling the rotation of the flaps. Compared with the inflatable film balloon, the balloon has a greater support force in the expanded state, and has a better treatment effect on calcified stenosis. In addition, the balloon is also equipped with a grasping forceps, which can be moved according to needs, so as to extend or retract the balloon to grasp the diseased tissue or foreign matter inside and outside the balloon, and the treatment effect is better.

[0012] Preferably, the flap comprises a first portion and a second portion which are hingedly connected.

[0013] Further preferably, the second part is located at the distal end of the first part and has a transition area and a gradual change area. In the closed state, the distance from the transition area to the axis is consistent from near to far, and the gradual change area is located at the distal end of the transition area and its distance from the axis gradually decreases from near to far. The design of the first part and the second part makes the deformation area fit the inner wall of the blood vessel better, and can also prevent the deformation area from expanding outward due to the distal end's excessive expansion and damaging the inner wall of the blood vessel.

[0014] In some embodiments, the petals are made of nylon.

[0015] Preferably, the balloon further comprises a first support rod and a second support rod fixedly connected to the inner sides of the first and second parts of the flap, the first support rod extending in the same direction as the first part and having both ends hinged to the shaping area and the second support rod respectively.

[0016] Preferably, the shaping area includes a cylindrical sac, a support ring arranged on the inner side of the sac and a support column connected to the support ring and extending along the axial direction, and the support column has at least a plurality of support columns which correspond one-to-one to the petals and are arranged circumferentially along the support ring, and the petals are hinged on the corresponding support columns.

[0017] Further preferably, there are a plurality of support rings arranged along the axial direction.

[0018] Preferably, the balloon opening and closing drive assembly includes a threaded tube movably arranged in the outer tube, a drive ring threadedly connected to the distal end of the threaded tube, and a drive rod arranged between the drive ring and the petals and corresponding to the petals one by one, the two ends of the drive rod are respectively hinged on the drive ring and the corresponding petals, the threaded tube is connected to the outer shell and can be operably rotated around its axis so that the drive ring slides axially and drives the petals to open outward or close inward.

[0019] Further preferably, the balloon opening and closing drive assembly further comprises a rotating button provided on the housing, the threaded tube is connected to the rotating button, and the threaded tube rotates when the rotating button is operated.

[0020] Preferably, the grasping forceps comprises a connecting seat and a first forceps body and a second forceps body rotatably disposed at left and right ends of the connecting seat.

[0021] Preferably, the grasping forceps driving assembly includes a first rod and a second rod slidably arranged in the outer tube along the axial direction, and a transmission rod group connected between the second rod and the grasping forceps, the first rod is fixedly connected to the connecting seat, and when the first rod and the second rod move simultaneously and in the same direction, the grasping forceps has a tendency to extend the balloon or retract the balloon; when one of the first rod and the second rod moves or both move in opposite directions, the grasping forceps has a tendency to switch to an expanded state or a closed state.

[0022] In some embodiments, the transmission rod group includes a connecting rod fixedly connected to the second rod member, two first transmission arms rotatably provided on the left and right sides of the connecting rod, and two second transmission arms rotatably provided on the two first transmission arms, respectively, and the two second transmission arms are respectively connected to the first clamp body and the second clamp body or their rotating shafts. When the connecting rod moves away from the connecting seat, the first transmission arm and the second transmission arm rotate and the angle between the two gradually increases and drives the first clamp body and the second clamp body to move in a direction away from each other; when the connecting rod approaches the connecting seat, the first transmission arm and the second transmission arm rotate and the angle between the two gradually decreases and drives the first clamp body and the second clamp body to move in a direction close to each other.

[0023] Preferably, the outer shell, the outer tube and the balloon each have a guidewire channel for the guidewire to pass through.

[0024] Preferably, the balloon is connected to the outer tube via a spherical joint.

[0025] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0026] The balloon in the vascular dilation device of the present invention is a mechanical balloon, which has greater supporting force in the expanded state and has a better treatment effect on calcified stenosis; in addition, the balloon in the vascular dilation device is also provided with a grasping forceps, which can be moved according to needs to remove the diseased tissue or foreign matter inside and outside the balloon. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of the structure of the distal end portion of the vascular dilation device of Example 1, wherein the balloon is in an expanded state and the grasping forceps are in a released state;

[0029] Figure 2 The distal end portion of the vascular dilation device of Example 1 is partially cut away in another structural schematic diagram, wherein the balloon is in an expanded state and the grasping forceps is in a released state;

[0030] Figure 3 Another structural schematic diagram of the distal end portion of the vascular dilation device of Example 1, wherein the balloon is in an expanded state and the grasping forceps are in a loosened state

[0031] Figure 4 It is a structural exploded view of the distal end portion of the vascular dilation device of Example 1, wherein the balloon is in a closed state and the grasping forceps is in a clamped state;

[0032] Figure 5 The distal end portion of the vasodilator of Example 1 is a schematic diagram showing the structure of the balloon not shown;

[0033] Figure 6 The distal end portion of the vascular dilation device of Example 1 is a schematic diagram showing the structure without the grasping forceps;

[0034] Figure 7 This is a schematic structural diagram of the grasping forceps of the vascular dilation device of Example 1;

[0035] Figure 8 This is a schematic structural diagram of the handle of the vasodilator of Example 1;

[0036] Wherein: 1. outer tube; 11. spherical joint;

[0037] 2. Balloon; 21. Shaped area; 22. Petal; 221. First part; 222. Transition area; 223. Gradual change area; 224. Guide wire channel; 23. First support rod; 24. Second support rod; 25. Support ring; 26. Support column;

[0038] 3. Grasping forceps; 31. First forceps body; 32. Second forceps body; 33. Connecting seat;

[0039] 4. Handle 4; 41. Housing; 411. Rotating button; 412. Pull rod; 413. Trigger; 42. Threaded tube; 43. Driving ring; 44. Driving rod; 45. First rod; 46. Second rod; 47. Connecting rod; 48. First transmission arm; 49. Second transmission arm;

[0040] 5. Guide wire;

[0041] 6. Double-lumen tube. DETAILED DESCRIPTION

[0042] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0043] In the description of the embodiments of the present invention, it should be understood that the terms "distal", "proximal", etc., indicating the position or location relationship are defined by the position of the vasodilator device when in use, wherein the side close to the operator is the proximal end, and the side away from the operator is the distal end. This is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore should not be understood as limiting the embodiments of the present invention.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] The disclosure below provides many different embodiments or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0047] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0048] Example 1

[0049] A vascular dilation device includes an outer tube 1, a balloon 2 connected to the distal end of the outer tube 1, a grasping forceps 3 arranged in the balloon 2, and a handle 4 connected to the proximal end of the outer tube 1. The handle 4 includes a shell 41, a balloon opening and closing driving component arranged on the shell 41 and configured to drive the balloon 2 to expand or close, and a grasping forceps driving component configured to move the grasping forceps 3 and drive the grasping forceps 3 to switch between a clamped state and a released state.

[0050] See also Figures 1 to 4 and Figure 6 The balloon 2 has a shaping area 21 and a deformation area. The shaping area 21 is connected to the outer tube 1, preferably connected to the outer tube 1 through a spherical joint 11. The deformation area includes a plurality of flaps 22 arranged along the circumference of the shaping area 21, the plurality of flaps 22 are hinged to the shaping area 21, and the flaps 22 can be operably rotated in a direction away from the axis of the balloon 2, so as to expand outward (see Figures 1 to 3 ), or rotate in a direction close to the axis, thereby closing inwards (see Figure 4 , Figure 6 ), thereby enabling the balloon to switch between an expanded state and a closed state. Preferably, the number of the petals 22 is 3 to 5. In this embodiment, the number of the petals 22 is 4.

[0051] The present invention can realize the expansion or closing of the balloon 2 by rotating the flap 22, and the expansion size of the balloon 2 can be adjusted according to the rotation angle of the flap 22, which is very convenient. Compared with the film balloon, the balloon 2 has greater support force in the expanded state and has a better treatment effect on calcified stenosis.

[0052] Furthermore, the flap 22 includes a first part 221 and a second part which are hinged to each other, the second part is located at the distal end of the first part 221, and the second part has a transition area 222 and a gradual change area 223. In the closed state, the distance from the transition area 222 to the axis of the balloon 2 is consistent from near to far, that is, the outer diameters of different areas of the transition area 222 are consistent; the gradual change area 223 is located at the distal end of the transition area 222 and its distance to the axis gradually decreases from near to far, that is, the outer diameter of the gradual change area 223 is larger at the proximal end and smaller at the distal end.

[0053] When the flap 22 rotates outward and opens, its opening radius usually increases gradually from near to far, which will cause: 1) the flap 22 is difficult to fit with the blood vessel wall; 2) the distal end of the flap 22 has the risk of breaking the blood vessel wall. The present invention adopts the design of the first part 221 and the second part. When the flap 22 rotates outward and opens, the second part will rotate slightly inward due to the pressure of the inner wall of the blood vessel, thereby preventing the distal end of the flap 22 from breaking the blood vessel due to the excessive opening radius. Further, through the design of the transition area 222 and the gradual area 223, the deformation area is better fitted with the inner wall of the blood vessel, thereby having a better expansion effect.

[0054] In order to further increase the supporting effect of the deformation zone, the balloon 2 further includes a first supporting rod 23 and a second supporting rod 24 fixedly connected to the first part 221 and the inner side of the second part. Figure 3 The first support rod 23 extends in the same direction as the first portion 221 and its two ends are respectively hinged on the shaping area 21 and the second support rod 24 . A plurality of first support rods 23 can be provided as required, and the second support rod 24 is connected to the transition area 222 .

[0055] The shaping area 21 includes a cylindrical capsule, a support ring 25 disposed inside the capsule, and a support column 26 connected to the support ring 25 and extending axially. The support column 26 has a plurality of support columns 26 corresponding to the flaps 22 one by one and arranged along the circumference of the support ring 25, and the support column 26 is hinged on the first support rod 23 of the corresponding flap 22. The number of support rings 25 can be adaptively set according to the size of the deformation zone. In this embodiment, the support ring 25 has two support rings 25 and is arranged at intervals along the axial direction of the balloon 2. The capsule, the first part 221 and the second part are preferably made of nylon. The support ring 25, the support column 26, the first support rod 23, and the second support rod 24 are preferably made of stainless steel.

[0056] In order to realize the expansion and closing of the balloon 2, the balloon opening and closing drive assembly of the present invention includes a threaded tube 42, a drive ring 43 and a drive rod 44. The threaded tube 42 is rotatably arranged in the outer tube 1, and its distal end passes through the support ring 25 and extends into the balloon 2, and the proximal end is operably arranged on the outer shell 41. The drive ring 43 is threadedly connected to the distal end of the threaded tube 42. The drive rod 44 is arranged between the drive ring 43 and the petal 22 and is arranged one by one with the petal 22. The two ends of the drive rod 44 are respectively hinged on the drive ring 43 and the first support rod 23 of the corresponding petal 22. When the threaded tube 42 rotates around its axis, the threaded tube 42 drives the drive ring 43 to slide axially and drives the petal 22 to open outward or close inward. Specifically, when the threaded tube 42 is rotated, the drive ring 43 can slide toward the distal end, thereby pushing the drive rod 44 to rotate outward, and the drive rod 44 pushes the first support rod 23 outward, and the first support rod is forced to rotate outward, thereby driving the petals 22 to expand outward; when the threaded tube 42 is rotated in the opposite direction, the drive ring 43 slides toward the proximal end, thereby pulling the drive rod 44 to rotate inward, and the drive rod 44 pulls the first support rod 23 and the petals 22 to close inward.

[0057] In order to facilitate the rotation of the threaded tube 42, as Figure 8 As shown, the balloon opening and closing drive assembly also includes a rotation button 411 disposed on the housing 41, and the threaded tube 42 is connected to the rotation button 411. When the rotation button 411 is operated, the threaded tube 42 rotates synchronously.

[0058] The grasping forceps 3 are slidably disposed in the balloon 2 along the axial direction of the balloon 2, and have a clamping state and a loosening state. Figure 7 The grasping forceps 3 comprises a connecting seat 33 and a first clamp body 31 and a second clamp body 32 rotatably arranged at the left and right ends of the connecting seat 33. The first clamp body 31 and the second clamp body 32 are preferably provided with anti-slip grooves on the clamping surfaces opposite to each other so as to better clamp foreign matter or diseased tissue.

[0059] The grasping forceps 3 is controlled to slide and switch between the clamping state and the loosening state by the grasping forceps driving assembly. Specifically, the grasping forceps driving assembly includes a first rod 45, a second rod 46 and a transmission rod group. Among them, the first rod 45 is axially slidably arranged in the outer tube 1, preferably arranged in the threaded tube 42, and its distal end is fixedly connected to the connecting seat 33, and its proximal end is operably connected to the outer shell 41. The second rod 46 is also axially slidably arranged in the outer tube 1, preferably arranged in the threaded tube 42, and its proximal end is operably connected to the outer shell 41, and its distal end is connected to the transmission rod group. The transmission rod group includes a connecting rod 47 fixedly connected to the distal end of the second rod 46, two first transmission arms 48 rotatably arranged on the left and right sides of the connecting rod 47, and two second transmission arms 49 rotatably arranged on the two first transmission arms 48, and the two second transmission arms 49 are respectively connected to the rotating shafts of the first clamp body 31 and the second clamp body 32. When the first rod 45 and the second rod 46 move toward the distal end at the same time, the grasping forceps 3 can extend out of the balloon 2 and be exposed; when the first rod 45 and the second rod 46 move toward the proximal end at the same time, the grasping forceps 3 can be retracted into the balloon 2. When one of the first rod 45 and the second rod 46 moves or both move in opposite directions, the grasping forceps 3 has a tendency to switch to an expanded state or a closed state, that is, when the connecting rod 47 moves away from the connecting seat 33 under the drive of the first rod 45 and the second rod 46, the first transmission arm 48 and the second transmission arm 49 rotate and the angle between them gradually increases and drives the first jaw body 31 and the second jaw body 32 to move in a direction away from each other, and the grasping forceps 3 opens; when the connecting rod 47 and the connecting seat 33 approach each other, the first transmission arm 48 and the second transmission arm 49 rotate and the angle between them gradually decreases and drives the first jaw body 31 and the second jaw body 32 to move in a direction close to each other, and the grasping forceps 3 closes.

[0060] In order to facilitate the operation of the first rod 45 and the second rod 46, the housing 41 is provided with a pull rod 412 corresponding to the first rod 45 and a trigger 413 corresponding to the second rod 46. The pull rod 412 and the trigger 413 can respectively drive the first rod 45 and the second rod 46 to move. The specific design of the pull rod 412 and the trigger 413 can refer to the prior art.

[0061] In order to prevent the first rod 45 and the second rod 46 from interfering with each other, a double-lumen tube 6 is further provided in the threaded tube 42. The first rod 45 and the second rod 46 pass through the first channel and the second channel of the double-lumen tube 6 respectively to be connected with their corresponding components.

[0062] In order to guide the balloon 2 to the target position, the outer shell 41, the outer tube 1 and the balloon 2 of the vascular dilation device are respectively provided with a guide wire channel 224 for the guide wire 5 to pass through. The guide wire channel 224 in the outer tube 1 is located in the threaded tube 42, and part of the guide wire channel 224 of the balloon 2 is located in the shaping area 21, specifically between the support ring 25 and the threaded tube 42, and the remaining part is located on the outside of one of the petals 22 in the deformation area.

[0063] Working principle:

[0064] Place the balloon 2 at the target position, turn the rotation button 411 to rotate the threaded tube 42 synchronously, and the threaded tube 42 drives the drive ring 43 to move axially toward the distal end while rotating. Driven by the drive ring 43, the drive rod 44 thereon rotates outward and drives the first support rod 23 to rotate outward, and the flap 22 gradually expands outward, thereby squeezing the plaque at the narrow part outward to achieve vascular expansion.

[0065] At this time, the grasping forceps 3 can be extended out of the balloon 2 to grasp foreign matter or diseased tissue. Specifically, the pull rod 412 is pushed and the trigger 413 is pressed simultaneously, so that the first rod 45 and the second rod 46 slide toward the distal end synchronously, and the grasping forceps 3 are pushed out of the balloon 2, and then the trigger 413 is operated in reverse, so that the second rod 46 pulls the connecting rod 47 to slide in the direction away from the grasping forceps 3, and the connecting rod 47 pulls the first transmission arm 48 and the second transmission arm 49 to rotate until both are straightened, and under the drive of the transmission arm, the first clamp body 31 and the second clamp body 32 rotate in the direction away from each other, and the grasping forceps 3 are opened. After grasping the foreign matter or diseased tissue, the trigger 413 is pressed to close the grasping forceps 3, and then the pull rod 412 and the trigger 413 are operated in reverse synchronously to retract the grasping forceps 3 into the balloon 2.

[0066] Rotate the rotation button 411 in the reverse direction, and the threaded tube 42 rotates in the reverse direction, driving the drive ring 43 to move axially toward the proximal end. The drive ring 43 pulls the drive rod 44 to rotate inward, and drives the first support rod 23 to rotate inward. The flaps 22 gradually rotate inward and close, and the balloon 2 can be withdrawn.

[0067] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A vasodilator, characterized in that: The vasodilator comprises: Outer tube (1); A balloon (2), the balloon (2) comprising a shaped area (21) and a deformation area, the shaped area (21) being connected to the distal end of the outer tube (1), the deformation area comprising a plurality of flaps (22) arranged along the circumference of the shaped area (21), the plurality of flaps (22) being hinged on the shaped area (21) and operable to rotate in a direction away from or close to the axis of the balloon (2), so that the balloon can switch between an expanded state and a closed state; A grasping forceps (3), the grasping forceps (3) being slidably disposed in the balloon (2) along the axial direction of the balloon (2), and having a clamping state and a loosening state; A handle (4), the handle (4) comprising a shell (41) connected to the proximal end of the outer tube (1), a balloon opening and closing drive component arranged on the shell (41) and configured to drive the balloon to expand or close, and a grasping forceps drive component configured to make the grasping forceps (3) slide and / or drive the grasping forceps (3) to switch between a clamped state and a released state.

2. The vasodilator according to claim 1, characterized in that: The flap (22) comprises a first part (221) and a second part which are hingedly connected.

3. The vasodilator according to claim 2, characterized in that: The second part is located at the far end of the first part (221) and has a transition area (222) and a gradual change area (223); in a closed state, the distance between the transition area (222) and the axis is consistent from near to far, and the gradual change area (223) is located at the far end of the transition area (222) and the distance between the transition area (222) and the axis gradually decreases from near to far.

4. The vasodilator according to claim 2, characterized in that: The balloon (2) further comprises a first support rod (23) and a second support rod (24) fixedly connected to the first part (221) and the inner side of the second part of the flap (22); the first support rod (23) and the first part (221) extend in the same direction and both ends of the first support rod (23) are hinged to the shaping area (21) and the second support rod (24), respectively.

5. The vasodilator according to claim 1, characterized in that: The shaping area (21) comprises a cylindrical capsule, a support ring (25) arranged inside the capsule, and a support column (26) connected to the support ring (25) and extending along the axial direction, wherein the support column (26) has at least a plurality of support columns (26) which correspond one-to-one to the petals (22) and are arranged along the circumference of the support ring (25), and the petals (22) are hinged on the corresponding support columns (26).

6. The vasodilator according to claim 1, characterized in that: The balloon opening and closing drive assembly includes a threaded tube (42) movably arranged in the outer tube (1), a drive ring (43) threadedly connected to the distal end of the threaded tube (42), and a drive rod (44) arranged between the drive ring (43) and the petals (22) and corresponding to the petals (22) one by one. The two ends of the drive rod (44) are respectively hinged on the drive ring (43) and the corresponding petals (22). The threaded tube (42) is connected to the outer shell (41) and can be operably rotated around its axis so that the drive ring (43) slides axially and drives the petals (22) to open outward or close inward.

7. The vasodilator according to claim 1, characterized in that: The grasping forceps (3) comprises a connecting seat (33) and a first forceps body (31) and a second forceps body (32) rotatably arranged at left and right ends of the connecting seat (33); The grasping forceps driving assembly comprises a first rod (45) and a second rod (46) which are slidably arranged in the outer tube (1) along the axial direction, and a transmission rod group connected between the second rod (46) and the grasping forceps (3), wherein the first rod (45) is fixedly connected to the connecting seat (33), and when the first rod (45) and the second rod (46) move simultaneously and in the same direction, the grasping forceps (3) has a tendency to extend the balloon (2) or retract the balloon (2); when one of the first rod (45) and the second rod (46) moves or both move in opposite directions, the grasping forceps (3) has a tendency to switch to an expanded state or a closed state.

8. The vascular dilation device according to claim 7, characterized in that: The transmission rod group comprises a connecting rod (47) fixedly connected to the second rod (46), two first transmission arms (48) rotatably arranged on the left and right sides of the connecting rod (47), and two second transmission arms (49) rotatably arranged on the two first transmission arms (48), respectively. The two second transmission arms (49) are respectively connected to the first caliper body (31), the second caliper body (32) or their rotating shafts. When the connecting rod (47) is away from the connecting seat (33), the first transmission arm (48) and the second transmission arm (49) rotate, and the angle between them gradually increases, and the first caliper body (31) and the second caliper body (32) are driven to move in a direction away from each other; when the connecting rod (47) is close to the connecting seat (33), the first transmission arm (48) and the second transmission arm (49) rotate, and the angle between them gradually decreases, and the first caliper body (31) and the second caliper body (32) are driven to move in a direction close to each other.

9. The vasodilator according to claim 1, characterized in that: The outer shell (41), the outer tube (1) and the balloon (2) are respectively provided with a guide wire channel (224) for the guide wire (5) to pass through.

10. The vasodilator according to claim 1, characterized in that: The balloon (2) is connected to the outer tube (1) via a spherical joint (11).

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