Cerebrovascular stenosis dilator

Abstract

The utility model discloses a cerebrovascular stenosis dilator, which relates to the technical field of medical instruments, comprises a sleeve, and is characterized in that dilation mechanisms for dilating a cerebrovascular stenosis part are arranged on two sides of the sleeve, and a retraction mechanism for controlling the dilation mechanisms to expand or retract is arranged in the dilation mechanisms. A connector is arranged at one end of the sleeve, a guide wire used for controlling the retracting and releasing mechanism to conduct retracting and releasing work is arranged in the sleeve, guide wires are arranged at the two ends of the sleeve, the expansion mechanism comprises a contraction net pipe, the contraction net pipe is located at one end of the sleeve, a fixing ring is fixedly arranged on the surface of one side of the contraction net pipe, and the contraction net pipe is connected with the connector. A connecting pipe is fixedly installed on the surface of one side of the fixing ring, the connecting pipe is located in the contraction net pipe, in the scheme, by arranging the expansion mechanism and the contraction and release mechanism, efficient and accurate expansion of the cerebrovascular stenosis position can be achieved, and the treatment safety is improved.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to a dilator for cerebral vascular stenosis. Background Art

[0002] Cerebral vascular stenosis is a disease that causes stroke and acute cerebrovascular accident. Immediate dilation of stenotic cerebral blood vessels is an important treatment method to restore blood supply to tissues and rescue ischemic brain tissue. Currently, the main treatments for cerebral vascular stenosis are balloon dilation and balloon dilation plus stent implantation.

[0003] This method of using a balloon catheter to dilate a narrowed segment of a cerebral blood vessel has some disadvantages. The main disadvantage is that the balloon dilation process actually involves injecting liquid into the balloon to cause it to expand and dilate, thereby blocking the blood vessel lumen while dilating the narrowed area. This will block the blood flow to the already ischemic area, aggravating the ischemia. In addition, the balloon catheter needs to be delivered to the target area by means of a catheter under the guidance of a guidewire. When the degree of stenosis of some blood vessels is severe, the balloon catheter with a balloon attached has a certain diameter, making it difficult to deliver the balloon catheter and not easy to reach the target area. Utility Model Content

[0004] The purpose of the present invention is to provide a dilator for treating cerebral vascular stenosis, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A dilator for cerebral vascular stenosis includes a cannula, characterized in that: expansion mechanisms for dilating cerebral vascular stenosis are provided on both sides of the cannula, a retraction mechanism for controlling its expansion or contraction is provided inside the expansion mechanism, a connector is provided at one end of the cannula, a guide wire for controlling the retraction mechanism to perform retraction and extension is provided inside the cannula, and guide wires are provided at both ends of the cannula.

[0007] Furthermore, the expansion mechanism includes: a shrinkable mesh tube, the shrinkable mesh tube is located at one end of the sleeve, a fixing ring is fixedly installed on one side surface of the shrinkable mesh tube, a connecting tube is fixedly installed on one side surface of the fixing ring, and the connecting tube is located inside the shrinkable mesh tube.

[0008] Furthermore, the expansion mechanism also includes: a connecting rod, which is located at the center of the surface of the connecting tube facing away from the fixed ring and can move inside the connecting tube. A connecting frame is provided on the other end surface of the connecting rod, and the four ends of the connecting frame are fixedly connected to the inner wall of the sliding ring.

[0009] Furthermore, four snap-fit grooves are provided on one side surface of the sleeve, and one end of the sleeve is divided into four connecting blocks via the four snap-fit grooves. An opening is provided at the center of the connecting surface between the connecting rod and the sliding ring to facilitate the penetration of the connecting block on the side surface of the sleeve, and the other end of the connecting block is fixedly connected to one side surface of the connecting pipe.

[0010] Furthermore, the retractable mechanism includes: a retractable rod, which is located inside the connecting tube and can slide inside the connecting tube, and one end of the retractable rod is fixedly connected to one end of the connecting rod.

[0011] Furthermore, the retractable mechanism also includes: four sliding blocks, the four sliding blocks are located on the surface of the retracting rod, the side surface of the connecting tube is provided with a sliding groove for facilitating the sliding of the sliding blocks, one side surface of the four sliding blocks is fixedly installed with a support rod, the top surface of the support rod is fixedly installed with a support plate, there are four support plates, and an elastic band is connected between every two support plates.

[0012] Compared with the prior art, the beneficial effects of the present invention are:

[0013] 1. In this solution, the expansion mechanism is provided to achieve efficient and precise expansion of cerebral vascular stenosis. The inclined design of the sliding groove and the coordination of the support plate and elastic band ensure the uniformity and stability of the contractile mesh tube during the expansion process, effectively avoiding the risk of over-expansion or under-expansion. By providing a contractile mesh tube to expand the blood vessel, the stenosis can be expanded without compromising the blood supply of the damaged blood vessel. Because blood flow is not blocked, the expansion operation time can be extended as needed, thereby not only performing dilation treatment of the stenosis segment, but also maintaining or improving the blood supply of the damaged blood vessel while ensuring the treatment of the stenosis.

[0014] 2. In the solution, by setting up a retraction and extension mechanism and operating the guide wire, the doctor can accurately control the sliding of the contraction rod, and then control the expansion and contraction of the support plate, so as to achieve precise expansion of the contraction network tube. Since the front end of the device has its own guide wire, in some cases where the blood vessels are abnormally narrow and the catheter is difficult to introduce, it can still rely on its own guide wire to introduce it into the narrowed section for expansion treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the utility model;

[0017] Figure 3 This is a schematic diagram of the expansion mechanism structure of the utility model;

[0018] Figure 4 This is a schematic diagram of the internal structure of the sliding ring of the present invention.

[0019] In the figure: 1. sleeve; 2. sliding ring; 3. guide wire; 4. joint; 5. shrink mesh tube; 6. fixing ring; 7. contraction rod; 8. connecting tube; 9. sliding groove; 10. support plate; 11. connecting rod; 12. engaging groove; 13. elastic band; 14. support rod; 15. sliding block. DETAILED DESCRIPTION

[0020] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0021] Example 1: Please refer to Figures 1 to 4 A cerebral vascular stenosis dilator includes a cannula 1, with dilation mechanisms for dilating cerebral vascular stenosis provided on both sides of the cannula 1, a retractable mechanism for controlling the expansion or contraction of the dilator provided inside the dilator mechanism, a connector 4 provided at one end of the cannula 1, a guide wire 3 for controlling the retractable mechanism to retract and extend, and guide wires 3 provided at both ends of the cannula 1;

[0022] The expansion mechanism includes: a contraction mesh tube 5, which is made of a plurality of nickel-titanium wires with an outer diameter of 60 microns, which are pressed and woven into a mesh tube with a mesh of 1 mm, and is shaped by heat treatment. The contraction mesh tube 5 is located at one end of the sleeve 1, and a fixing ring 6 is fixedly installed on one side surface of the contraction mesh tube 5. A connecting tube 8 is fixedly installed on one side surface of the fixing ring 6. The connecting tube 8 is located inside the contraction mesh tube 5, and a movable connecting rod 11 is provided at the center of the side surface of the connecting tube 8 away from the fixing ring 6. A connecting frame is provided on the other end surface of the connecting rod 11, and the four ends of the connecting frame are fixedly connected to the inner wall of the sliding ring 2. Four engaging grooves 12 are provided on one side surface of the sleeve 1, and one end of the sleeve 1 is divided into four connecting blocks via the four engaging grooves 12. An opening is provided at the center of the connecting surface between the connecting rod 11 and the sliding ring 2 to facilitate the penetration of the connecting block on the side surface of the sleeve 1. The other end of the connecting block is fixedly connected to the side surface of the connecting tube 8, and the engaging groove 12 is engaged with the connecting frame;

[0023] When the shrinking network tube 5 is in the shrinking state, the connecting rod 11 and the sliding ring 2 are engaged with the engaging groove 12 on the sleeve 1 through the connecting frame, so that the entire expansion mechanism is in a compressed state, which is convenient for passing through the stenosis of the cerebral blood vessels. When the dilator reaches the stenosis, the contraction rod 7 in the retracting and releasing mechanism can be controlled to slide by operating the guide wire 3. Since the contraction rod 7 is fixedly connected to the connecting rod 11, as the connecting rod 11 moves, the contraction rod 7 will be driven to move synchronously, thereby driving the four sliding blocks 15 to slide upward inside the sliding groove 9, so that the four support plates 10 are gradually expanded. The four support plates 10 are used to hold the shrinking network tube 5 open from the inside, so that the shrinking network tube 5 begins to expand. The shrinking network tube 5 is fully expanded under the support of its own material elasticity and the support of the support plates 10, thereby expanding the stenosis of the cerebral blood vessels.

[0024] The retracting and releasing mechanism includes: a retracting rod 7, which is located inside the connecting tube 8 and can slide inside the connecting tube 8, one end of the retracting rod 7 is fixedly connected to one end of the connecting rod 11, and four sliding blocks 15 are fixedly connected to the surface of the retracting rod 7. The side surface of the connecting tube 8 is provided with a sliding groove 9 for facilitating the sliding of the sliding blocks 15. The sliding groove 9 is an inclined surface inclined to one side, and the side close to the fixed ring 6 is the lowest point. A support rod 14 is fixedly installed on one side surface of the four sliding blocks 15, and a support plate 10 is fixedly installed on the top surface of the support rod 14. The support plate 10 supports the shrinking net tube 5 by sliding on the inclined surface, so that the shrinking net tube 5 can be expanded or contracted. There are four support plates 10, and an elastic band 13 is connected between every two support plates 10;

[0025] Four sliding blocks 15 are fixed on the surface of the gathering rod 7. These sliding blocks 15 can slide in the sliding groove 9 on the side surface of the connecting tube 8. The sliding groove 9 is designed to be an inclined surface inclined to one side, so that the sliding block 15 can gradually expand outward or retract inward when sliding. When the gathering rod 7 slides, it drives the support plate 10 to move through the support rod 14. Due to the inclined design of the sliding groove 9, the support plate 10 will gradually rise or fall when moving, thereby supporting or releasing the contraction network tube 5. An elastic band 13 is connected between every two support plates 10. These elastic bands provide additional support force during expansion to ensure that the contraction network tube 5 can expand evenly. During contraction, the elastic band 13 helps the contraction network tube 5 to return to its initial state faster. When the expander needs to be retracted, the guide wire 3 is reversed to make the gathering rod 7 slide in the lower direction. This process causes the support plate 10 to gradually decline, and the elastic band 13 begins to work, helping the contraction network tube 5 to quickly contract to its initial state.

[0026] In this embodiment, when the shrinkable mesh tube 5 is in the shrinking state, the connecting rod 11 and the sliding ring 2 are engaged with the engaging groove 12 on the sleeve 1 through the connecting frame, so that the entire expansion mechanism is in a compressed state, which facilitates passage through the narrowed part of the cerebral blood vessels;

[0027] When the dilator reaches the stenosis, the guide wire 3 is operated to control the sliding of the contraction rod 7 in the retracting and releasing mechanism. Since the contraction rod 7 is fixedly connected to the connecting rod 11, the movement of the connecting rod 11 will drive the contraction rod 7 to move synchronously, thereby driving the four sliding blocks 15 to slide upward inside the sliding groove 9, thereby gradually expanding the four support plates 10, causing the contraction network tube 5 to begin to expand, thereby dilating the stenosis of the cerebral blood vessels;

[0028] Four sliding blocks 15 are fixed to the surface of the bunching rod 7. These sliding blocks 15 can slide in the sliding grooves 9 on the side surfaces of the connecting tube 8, so that the sliding blocks 15 can gradually expand or contract when sliding. When the bunching rod 7 slides, it drives the support plate 10 to move through the support rod 14. Due to the inclined design of the sliding grooves 9, the support plate 10 will gradually rise or fall when moving, thereby achieving support or release of the shrinking network tube 5;

[0029] An elastic band 13 is connected between every two support plates 10. These elastic bands provide additional support force during expansion to ensure that the contraction network tube 5 can expand evenly. During contraction, the elastic band 13 helps the contraction network tube 5 to return to its original state faster. By operating the guide wire 3, the contraction network tube 5 can be quickly contracted to its original state.

[0030] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A dilator for cerebral vascular stenosis, comprising a cannula (1), characterized in that: Both sides of the sleeve (1) are provided with expansion mechanisms for expanding cerebral blood vessel stenosis, and a retracting mechanism for controlling the expansion or contraction of the expansion mechanism is provided inside the expansion mechanism. A connector (4) is provided at one end of the sleeve (1), and a guide wire (3) for controlling the retracting mechanism to retract and retract is provided inside the sleeve (1). Both ends of the sleeve (1) are provided with guide wires (3).

2. The dilator for cerebral vascular stenosis according to claim 1, characterized in that: The expansion mechanism comprises: a shrinkable mesh tube (5), the shrinkable mesh tube (5) being located at one end of the sleeve (1), a fixing ring (6) being fixedly mounted on one side surface of the shrinkable mesh tube (5), a connecting tube (8) being fixedly mounted on one side surface of the fixing ring (6), and the connecting tube (8) being located inside the shrinkable mesh tube (5).

3. The dilator for cerebral vascular stenosis according to claim 2, characterized in that: The expansion mechanism further comprises: a connecting rod (11), the connecting rod (11) being located at the center of the surface of the side of the connecting tube (8) away from the fixed ring (6) and being movable inside the connecting tube (8), a connecting frame being provided on the other end surface of the connecting rod (11), the four ends of the connecting frame being fixedly connected to the inner wall of the sliding ring (2).

4. The dilator for cerebral vascular stenosis according to claim 3, characterized in that: One side surface of the sleeve (1) is provided with four engaging grooves (12), one end of the sleeve (1) is divided into four connecting blocks via the four engaging grooves (12), an opening is provided at the center of the connecting surface between the connecting rod (11) and the sliding ring (2) to facilitate the penetration of the connecting block on the side surface of the sleeve (1), and the other end of the connecting block is fixedly connected to one side surface of the connecting pipe (8).

5. The dilator for cerebral vascular stenosis according to claim 1, characterized in that: The retracting and extending mechanism comprises: a retracting rod (7), the retracting rod (7) is located inside the connecting tube (8) and can slide inside the connecting tube (8), and one end of the retracting rod (7) is fixedly connected to one end of the connecting rod (11).

6. The dilator for cerebral vascular stenosis according to claim 5, characterized in that: The retractable mechanism further comprises: four sliding blocks (15), the four sliding blocks (15) being located on the surface of the retracting rod (7), the side surface of the connecting tube (8) being provided with a sliding groove (9) for facilitating the sliding of the sliding blocks (15), a support rod (14) being fixedly mounted on one side surface of each of the four sliding blocks (15), a support plate (10) being fixedly mounted on the top surface of the support rod (14), four support plates (10), and an elastic band (13) being connected between every two of the support plates (10).

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