A rotational atherectomy system that can reduce the risk of vascular injury

Abstract

The utility model discloses a can reduce the risk of vascular injury's rotary grinding system, including motor, shaft coupling, connecting chuck, handle, head and guide wire, the output shaft of motor is connected with shaft coupling, the guide wire is connected with the other end of shaft coupling through connecting chuck, handle is detachably connected with the guide wire, the head surface is equipped with the dentate structure, the dentate structure is with the head one end point as the center and is along the axial interval distribution.

Description

Technical Field

[0001] This utility model relates to the field of rotational atherectomy technology, and in particular to a rotational atherectomy system that can reduce the risk of vascular damage. Background Technology

[0002] Severe calcification of arteries often leads to high failure rates in interventional treatment due to insufficient balloon dilation or difficulty in stent apposition, thus driving the development of rotational atherectomy. Rotational atherectomy has become a common technique for removing calcified or fibrotic lipid plaques. This procedure is most commonly used to open calcified lesions in the coronary arteries. Existing rotational atherectomy devices mainly consist of a flexible, rotatable helix and a burr head supported by the helix. The diameter of the burr head is not less than the diameter of the rotatable helix. During interventional rotational atherectomy, a guidewire is first inserted into the diseased coronary artery. Then, the rotatable helix with the burr head is inserted along the guidewire to the lesion location. The motor is activated, and the burr head rotates at high speed to ablate the calcified plaque. The ablated plaque fragments are very small and will not block capillaries; they are eventually phagocytosed and cleared by macrophages. The burr head advances back and forth, ablating a certain distance of calcified plaque tissue, ultimately completing the interventional treatment of coronary calcified lesions.

[0003] Traditional rotational atherectomy devices may damage the vessel wall due to high-speed rotation, leading to vascular perforation, dissection, or thrombosis. They may also induce slow flow or no-reflow, affecting myocardial perfusion and increasing postoperative risks. Furthermore, in cases of highly rigid and complex calcified lesions (such as bifurcations, twists, or in-stent restenosis), the guidewire is easily squeezed or entangled during repassage. Improper operator technique (such as excessive rotation in one direction or forceful retraction) may cause the distal microwire of the guidewire to untangle or even break. Severe calcified lesions require extremely high guidewire tip rigidity and pushing force. Traditional guidewires have strong tip flexibility but limited ability to penetrate calcified plaques; while stiffened guidewires can pass through calcified lesions, they increase the risk of vascular perforation. Utility Model Content

[0004] To address the aforementioned technical problems, this invention provides a rotational atherectomy system that can reduce the risk of vascular injury.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows:

[0006] A rotary atherectomy system that can reduce the risk of vascular injury includes a motor, a coupling, a connecting chuck, a handle, a head end, and a guidewire. The output shaft of the motor is connected to the coupling, the guidewire is connected to the other end of the coupling via the connecting chuck, the handle is detachably connected to the guidewire, and the surface of the head end is provided with a toothed structure, the toothed structure being spaced axially around one end of the head end.

[0007] A further improvement to the above technical solution is as follows:

[0008] Preferably, the tooth-like structure is serrated.

[0009] Preferably, the head end includes a hemisphere and a circular tube segment at the end. The toothed structure of the hemisphere is distributed along an axis with the central vertex of the hemisphere as the center, and the toothed structure of the circular tube segment is arranged parallel and spaced along the length of the circular tube.

[0010] Preferably, the tooth-like structure comprises multiple serrations, each serration being 0.4–0.6 mm long, 0.1–0.2 mm wide, and 0.1–0.2 mm high, with a horizontal spacing of 0.4–0.6 mm and a circumferential spacing of 0.1–0.2 mm.

[0011] Preferably, the connecting clamp includes a housing and a clamping body. The housing has a mounting groove for mounting the clamping body and a connecting groove at both ends. The clamping body is installed in the mounting groove. The guide wire is clamped in the clamping body. The connecting clamp is connected to the coupling through a connecting shaft. One end of the connecting shaft is fixed in the connecting groove.

[0012] Preferably, the grip includes a housing, a bearing, and a connector. The connector does not directly contact the housing, and the connector has a through hole in its center for the guide wire to pass through.

[0013] Preferably, a bearing is provided between the connector and the housing.

[0014] The rotational atherectomy system provided by this invention, which can reduce the risk of vascular injury, has the following advantages compared with the prior art:

[0015] This invention relates to a rotational atherectomy system that reduces the risk of vascular injury. The system employs a low-amplitude reciprocating rotational vibration, causing slight deformation of the blood vessel with the vibration, thus minimizing damage. The system features a toothed structure that effectively breaks down calcified plaques, and while providing a large coverage area, it has a small contact area with the blood vessel, further reducing the risk of vascular injury. Attached Figure Description

[0016] Figure 1 This is a diagram of the rotary grinding system of this utility model.

[0017] Figure 2 This is a schematic diagram of the head end structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the connecting clamp structure of this utility model.

[0019] Figure 4 This is a schematic diagram of the grip structure of this utility model.

[0020] Explanation of the labels in the diagram:

[0021] 1. Motor; 2. Coupling; 21. Connecting shaft; 3. Connecting chuck; 31. Housing; 32. Clamp body; 33. Mounting slot; 34. Connecting slot; 4. Handle; 41. Outer shell; 42. Bearing; 43. Connecting piece; 44. Through hole; 5. Head end; 51. Hemisphere; 52. Circular tube section; 53. Toothed structure; 6. Guide wire. Detailed Implementation

[0022] The specific embodiments of this utility model are described in detail below. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0023] Figure 1 This invention illustrates one embodiment of a rotational atherectomy system that can reduce the risk of vascular injury. The rotational atherectomy system includes a motor 1, a coupling 2, a connecting chuck 3, a handle 4, a head end 5, and a guidewire 6. The output shaft 11 of the motor 1 is connected to the coupling 2, and the guidewire 6 is connected to the other end of the coupling 2 via the connecting chuck 3. The output shaft 11 of the motor 1 outputs mechanical transmission, which is transmitted to the guidewire 6 through the coupling 2, thereby controlling the vibration of the guidewire 6.

[0024] In this embodiment, a handle 4 is provided on the guide wire 6. The handle 4 is detachably connected to the guide wire 6. A bearing is provided between the handle 4 and the guide wire 6 so that the vibration of the guide wire is not affected when the hand is holding the guide wire.

[0025] In this embodiment, the tip 5 comprises two parts: a hemisphere 51 and a circular tube segment 52. The tip surface is provided with a toothed structure 53. The toothed structure of the hemisphere 51 is distributed along an axis centered on the central apex of the hemisphere, preventing pressure concentration at a single point on the tip and reducing damage to blood vessels. It also facilitates guidewire placement at the plaque site and prevents tip slippage during guidewire vibration. The toothed structure is serrated and spaced apart. The toothed structure of the circular tube segment 52 consists of multiple serrations, spaced parallel to each other along the length of the circular tube.

[0026] In this embodiment, the serrations are approximately 0.5 mm long, 0.1-0.2 mm wide, and 0.1-0.2 mm high, with a horizontal spacing of approximately 0.5 mm and a circumferential spacing of approximately 0.15 mm. The tooth-like structure effectively breaks down calcified plaques, and while covering a large area, it has a small contact area with blood vessels, thus reducing the risk of vascular damage.

[0027] like Figure 3As shown, the connecting clamp 3 in this embodiment includes a housing 31 and a clamping body 32. The housing 31 has a mounting groove 33 for mounting the clamping body 32 and a connecting groove 34 at both ends. The clamping body 32 is composed of two half-cones. The mounting groove 33 is a conical groove corresponding to the clamping body, with the larger diameter section of the clamping body 32 located within the mounting groove. The guide wire 6 is clamped between the two half-cones. The connecting clamp 3 is connected to the coupling 2 via a connecting shaft 21, one end of which is fixed within the connecting groove 34.

[0028] like Figure 4 As shown, the grip 4 in this embodiment includes a housing 41, a bearing 42, and a connector 43. The connector 43 is not in direct contact with the housing 41, and the bearing 42 is provided between the connector 43 and the housing 41. When the guide wire 6 rotates, the housing 41 does not rotate. The connector 43 has a through hole 44 at its center for the guide wire 6 to pass through, and the diameter of the through hole 44 is slightly smaller than that of the guide wire. After the guide wire 6 passes through, it can be locked in the through hole 44 and will not slip during operation. In this embodiment, the housing 41 can be divided into upper and lower parts for easy installation. The upper and lower parts can be fixed by commonly used methods such as snap-fit, clamp fixation, and pin fixation.

[0029] This invention relates to a rotational atherectomy system that can reduce the risk of vascular injury. During operation, the guidewire 6 is first pushed to the lesion site, then the proximal end of the guidewire is passed through the through hole in the center of the handle and attached to the handle 4. Then, the proximal end of the guidewire is clamped with the connecting chuck 3 to connect the guidewire 6 to the coupling 2. The user's hand grips the handle, the motor is turned on, and the guidewire 6 is driven to perform high-frequency, low-amplitude reciprocating rotation and vibration, thereby breaking down the calcified plaque.

[0030] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the utility model in any way. Although this utility model has been disclosed above with reference to preferred embodiments, it is not intended to limit the utility model. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model without departing from the scope of the utility model's technical solution should fall within the protection scope of this utility model's technical solution.

Claims

1. A rotational atherectomy system that can reduce the risk of vascular injury, characterized in that, It includes a motor, a coupling, a connecting chuck, a handle, a head end, and a guide wire. The output shaft of the motor is connected to the coupling, and the guide wire is connected to the other end of the coupling through the connecting chuck. The handle is detachably connected to the guide wire. The surface of the head end is provided with a toothed structure, and the toothed structure is distributed axially at intervals with one end of the head end as the center.

2. The rotational atherectomy system according to claim 1, which can reduce the risk of vascular injury, is characterized in that, The tooth-like structure is serrated.

3. The rotational atherectomy system according to claim 2, which can reduce the risk of vascular injury, is characterized in that, The head end includes a hemisphere and a circular tube segment. The toothed structure of the hemisphere is distributed along an axis with the central vertex of the hemisphere as the center. The toothed structure of the circular tube segment is arranged parallel to each other along the length of the circular tube.

4. The rotational atherectomy system according to claim 3, which can reduce the risk of vascular injury, is characterized in that, The tooth-like structure consists of multiple serrations, each 0.4–0.6 mm long, 0.1–0.2 mm wide, and 0.1–0.2 mm high, with a horizontal spacing of 0.4–0.6 mm and a circumferential spacing of 0.1–0.2 mm.

5. The rotational atherectomy system according to claim 1, characterized in that, The connecting clamp includes a housing and a clamping body. The housing has a mounting groove for mounting the clamping body and a connecting groove at both ends. The clamping body is installed in the mounting groove. The guide wire is clamped in the clamping body. The connecting clamp is connected to the coupling through a connecting shaft. One end of the connecting shaft is fixed in the connecting groove.

6. The rotational atherectomy system according to claim 5, characterized in that, The grip includes a housing, a bearing, and a connector. The connector is not in direct contact with the housing, and the connector has a through hole in the center for the guide wire to pass through.

7. The rotational atherectomy system according to claim 6, characterized in that, A bearing is provided between the connector and the housing.

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