A patch cutting device with a retractable rotary cutting blade

Abstract

This utility model provides a plaque cutting device with retractable rotary cutting blades, belonging to the field of medical device technology. It includes: a cutting catheter, a cutting section, a dilator, a balloon, a blade holder, and multiple rotary cutting blades. The outer surface of the cutting catheter has a cutting opening; the cutting section is disposed on the surface of the cutting opening; the inner side of the cutting catheter has a cavity, and the dilator is detachably installed in the cavity; the balloon is disposed on the cutting catheter; one end of the blade holder is rotatably mounted on the cutting section, and the other end is mounted on the balloon, the balloon being used to drive the rotation of the blade holder relative to the cutting catheter; multiple rotary cutting blades are distributed on the blade holder. This device solves the problems of inconvenient blade holder storage and unstable plaque occlusion after cutting.

Description

Technical Field

[0001] This utility model belongs to the field of medical device technology, specifically relating to a plaque cutting device with a retractable rotary cutting blade. Background Technology

[0002] Arteriovenous fistula formation alters existing hemodynamics, and the high levels of systemic inflammation and oxidative stress caused by kidney disease, along with repeated punctures during hemodialysis, easily lead to vascular stenosis and acute thrombosis. The main treatments for arteriovenous fistula stenosis and acute thrombosis are percutaneous transluminal angioplasty (PTA) and surgery. PTA primarily involves balloon dilation, but for highly resistant fibrous plaque stenosis, existing pressure-focused balloons (including cutting balloons, chocolate balloons, and scoring balloons) are less effective.

[0003] In existing technologies, balloons are used to dilate narrowed blood vessels. During balloon dilation, plaque fragments are generated, and there is a lack of plaque collection. Utility Model Content

[0004] This invention provides a patch slicing device with a retractable rotary cutter to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] A plaque slicing device with retractable rotary cutting blades includes: a slicing guide tube, a slicing section, an expander, a balloon, a blade holder, and multiple slicing blades. The outer surface of the slicing guide tube has a slicing opening; the slicing section is disposed on the surface of the slicing opening; a cavity is provided inside the slicing guide tube, and the expander is detachably installed within the cavity; the balloon is disposed on the slicing guide tube; one end of the blade holder is rotatably mounted on the slicing section, and the other end is mounted on the balloon, the balloon being used to drive the rotation of the blade holder relative to the slicing guide tube; multiple slicing blades are distributed on the blade holder.

[0007] Furthermore, it also includes: two developing rings, a flexible element, a rotating part, and an indicator plate. The two developing rings are located on the surface of the rotary cutting guide, and the two developing rings are respectively located at both ends of the blade holder; the flexible element is installed between the blade holder and the rotary cutting part; the rotating part is sleeved on the end of the rotary cutting guide away from the rotary cutting part; the indicator plate is disposed on the rotating part, and the diameter of the indicator plate is aligned with the direction of the rotary cutting opening.

[0008] Furthermore, the rotary cutting catheter has an annular channel, and the balloon has an infusion channel. The annular channel is connected to the infusion channel, and a filler is injected into the annular channel to push out the balloon.

[0009] Furthermore, the balloon is arranged around the outer wall of the rotary cutting catheter, and the diameter of the rotary cutting is equal to the diameter of the balloon.

[0010] Furthermore, the expander has a connecting groove on its side, and the top of the connecting groove is connected and matched with the rotary cutting opening.

[0011] Furthermore, the end face of the rotating part is fitted with a moiré pattern.

[0012] Furthermore, a support ring and a protective component are provided at the end of the connecting groove away from the expander, and the protective component is an integrally formed flexible conical structure.

[0013] Furthermore, the bottom outer wall of the annular channel is connected to a one-way valve.

[0014] This utility model provides a patch cutting device with a retractable rotary cutting blade, which has the following advantages:

[0015] The coordinated design of the rotary cutting catheter and the cutting port allows for continuous circumferential cutting at the cutting port location. The coordinated design of the dilator and the connecting groove allows the circumcised plaque to fall off promptly, facilitating plaque removal. The expansion and contraction of the balloon raises and retracts the blade holder, providing a more flexible operating procedure and effectively preventing circumcised debris from entering the posterior blood vessel. The combination of the blade holder and the rotary cutting blade increases the circumferential cutting range of the rotary cutting unit, matching irregularly proliferating plaques and improving the treatment effect of circumferential cutting. The use of multiple blades greatly protects the physiological function of the blood vessel, allowing plaques of different thicknesses and shapes to be circumcised, thus improving treatment efficacy. Furthermore, the height of the rotary cutting unit is greater than the setting height of the cutting port, allowing the rotary cutting unit to contact the plaque more quickly, reducing adjustment time. The protective device prevents circumcised plaque from easily entering the rotary cutting catheter, avoiding affecting treatment precision. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a patch slicing device with a retractable slicing blade provided in an embodiment of this utility model;

[0018] Figure 2 An exploded view of a patch slicing device with a retractable slicing blade provided in an embodiment of this utility model;

[0019] Figure 3 A schematic diagram of the rotary cutting conduit structure of a patch rotary cutting device with a retractable rotary cutting blade provided in an embodiment of this utility model;

[0020] Figure 4 A schematic diagram of the balloon in the expanded state of a plaque slicing device with a retractable slicing blade provided in an embodiment of this utility model;

[0021] Figure 5 For along Figure 4 A cross-sectional view of the AA path unfolded in the middle;

[0022] Figure 6 For along Figure 4 A cross-sectional view of the BB path expansion;

[0023] Figure 7 For along Figure 4 A cross-sectional view of the CC path expansion;

[0024] Figure 8 This is a schematic diagram of the installation structure of the blade holder and rotary cutter provided in an embodiment of the present utility model.

[0025] In the diagram: 1-Cut catheter; 2-Cut port; 3-Cut section; 4-Rotating section; 5-Indicator plate; 6-Diffuser; 7-Connecting groove; 8-Support ring; 9-Protective component; 21-Balloon; 211-Support structure; 212-Illuminating ring; 31-Scalpel holder; 32-Cut blade; 11-Annular channel; 12-Moiré pattern; 13-One-way valve. Detailed Implementation

[0026] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0027] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to welding, bolting, or riveting; they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Example

[0030] like Figures 1 to 8 As shown in the figure, this utility model embodiment proposes a patch cutting device with retractable rotary cutting blades, including: a rotary cutting guide tube 1, a rotary cutting section 3, an expander 6, a balloon 21, a blade holder 31, and multiple rotary cutting blades 32. A rotary cutting opening 2 is provided on the outer surface of the rotary cutting guide tube 1; the rotary cutting section 3 is disposed on the surface of the rotary cutting opening 2; a cavity is provided on the inner side of the rotary cutting guide tube 1, and the expander 6 is detachably installed in the cavity; the balloon 21 is disposed on the rotary cutting guide tube 1; one end of the blade holder 31 is rotatably mounted on the rotary cutting section 3, and the other end is mounted on the balloon 21, the balloon 21 being used to drive the rotation of the blade holder 31 relative to the rotary cutting guide tube 1; multiple rotary cutting blades 32 are distributed on the blade holder 31.

[0031] In this embodiment, the outer surface of the rotary cutting conduit 1 is provided with a rotary cutting port 2, the surface of the rotary cutting port 2 is provided with a rotary cutting part 3, and the inner side of the rotary cutting conduit 1 is provided with a cavity. The rotary cutting conduit 1 is fitted with an expander 6, the side of the expander 6 is provided with a connecting groove 7, the top of the connecting groove 7 is connected and matched with the rotary cutting port 2, the side of the rotary cutting conduit 1 away from the rotary cutting port 2 is provided with a balloon 21, and the rotary cutting part 3 includes a blade holder 31, the top of the blade holder 31 is provided with a rotary cutting blade 32.

[0032] In the implementation of this embodiment, the following are also included: two imaging rings 212, a rotating part 4, and an indicator plate 5. The two imaging rings 212 are located on the surface of the rotary cutting catheter 1, and the two imaging rings 212 are respectively located at both ends of the balloon 21; the rotating part 4 is sleeved on the end of the rotary cutting catheter 1 away from the rotary cutting part 3; the indicator plate 5 is disposed on the rotating part 4, and the diameter of the indicator plate 5 is aligned with the direction of the rotary cutting opening 2.

[0033] In this embodiment, the combination of the blade holder 31 and the rotary cutting blade 32 increases the circumferential cutting range of the rotary cutting section 3, matching the irregularly proliferating plaques and thus improving the therapeutic effect of circumferential cutting. Simultaneously, the structure employing multiple blades spaced apart greatly protects the physiological function of the blood vessels. Furthermore, the inclusion of a contrast ring 212 allows for direct observation of the balloon 21's expansion in conjunction with angiography equipment, adapting to different plaque removal needs. This ring helps transmit the elasticity of the balloon 21, allowing the rotary cutting section 3 to rise, facilitating plaque circumferential cutting. When both the indicator plate 5 and the rotary cutting opening 2 are at the top of the rotary cutting catheter 1, the indicator plate 5 must be positioned above when the dilator 6 is withdrawn from the inner lumen of the rotary cutting catheter 1. When the indicator plate 5 and the rotary cutting opening 2 are located at opposite positions within the rotary cutting catheter 1, the indicator plate 5 must be positioned below when the dilator 6 is withdrawn. This method ensures that the circumferential cutting direction of the rotary cutting opening 2 is always correct.

[0034] In the implementation of this embodiment, an annular channel 11 is provided inside the rotary cutting catheter 1, and an infusion channel is provided on the balloon 21. The annular channel 11 is connected to the infusion channel. Filler is injected into the annular channel 11 to push out the balloon 21.

[0035] In this embodiment, the filler can be a safe gas or a solution, and can be used in conjunction with contrast fluid to perform contrast imaging on the balloon 21 to facilitate visualization of the specific situation at the excision site. Combined with the positioning of the contrast ring 212, it improves the accuracy of the surgery.

[0036] In the implementation of this embodiment, the balloon 21 is arranged around the outer wall of the rotary cutting catheter 1, and the diameter of the rotary cutting is equal to the diameter of the balloon 21.

[0037] In this embodiment, by using a contrast agent, the balloon 21 is expanded to the diameter corresponding to the cut vessel, effectively blocking the blood and facilitating the cut operation.

[0038] In the implementation of this embodiment, the side of the expander 6 is provided with a connecting groove 7, and the top of the connecting groove 7 is connected and matched with the rotary cutting port 2.

[0039] In this embodiment, the combination of the rotary cutting conduit 1 and the rotary cutting port 2 helps the rotary cutting part 3 to continuously cut around the perimeter at the rotary cutting port 2. The combination of the expander 6 and the connecting groove 7 allows the circumcised plaque to fall off in time, facilitating the cleaning of the plaque.

[0040] In the implementation of this embodiment, the end face of the rotating part 4 is fitted with a moiré pattern 12.

[0041] In this embodiment, the sleeve of the rotating part 4 and the cutting catheter 1 allows medical personnel to hold the cutting catheter 1 and rotate it stably. At the same time, the fitting installation of the moiré pattern 12 makes it less likely for the medical personnel's hands to slip when operating the rotating part 4.

[0042] In the implementation of this embodiment, a support ring 8 and a protective element 9 are provided at the end of the connecting groove 7 away from the expander 6. The protective element 9 is an integrally formed flexible conical structure.

[0043] In this embodiment, the protective element 9 further ensures the integrity of the support ring 8 structure, which is beneficial for subsequent patch removal.

[0044] In the implementation of this embodiment, the bottom outer wall of the annular channel 11 is connected to the one-way valve 13.

[0045] In this embodiment, the airtightness control of the internal annular channel 11 is further improved by using a one-way valve 13.

[0046] In summary, when using a plaque cutting device with a retractable rotary cutter, firstly, a puncture needle is used to puncture a blood vessel in the patient's arm, and a guidewire is inserted along the puncture needle. Guided by the puncture needle, the guidewire is inserted, and after placement, the puncture needle is withdrawn. Then, the dilator and sheath are inserted into the blood vessel along the guidewire. The guidewire and dilator are withdrawn, and the cutting catheter 1 and dilator 6 are inserted into the blood vessel along the sheath, bringing the cutting part 3 into contact with the plaque. Immediately afterwards, the balloon is inflated, and in conjunction with the positioning of the contrast ring 212, the balloon 21 is filled with liquid, and the plaque is lifted. To provide a stable seal, the stored blade holder 31 is raised, with the end of the blade holder 31 being approximately equal to the maximum diameter of the rotary cutting area. This allows multiple rotary cutting blades 32 to be accurately transported to their corresponding working areas. By using a pressure gauge and a one-way air valve to pump air, the rotary cutting section 3 can be stably ejected, allowing multiple rotary cutting blades 32 to continuously make circumferential cuts. At the same time, the connecting groove 7 on the side of the expander 6 helps the circumcised patch fall down. The push plate on the outside of the support ring 8 supports and transports the patch, ultimately allowing the circumcised patch to be stably extracted.

[0047] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A patch cutting device with a retractable rotary cutting blade, characterized in that, include: A rotary cutting conduit (1) has a rotary cutting port (2) on its outer surface. A rotary cutting section (3) is provided on the surface of the rotary cutting opening (2); The expander (6) has a cavity on the inner side of the rotary cutting catheter (1), and the expander (6) can be detachably installed in the cavity; A balloon (21) is mounted on the rotary cutting catheter (1); The blade holder (31) is rotatably mounted on the rotary cutting part (3) at one end and mounted on the balloon (21) at the other end. The balloon (21) is used to drive the blade holder (31) to rotate relative to the rotary cutting conduit (1). Multiple rotary cutting blades (32) are distributed on the blade holder (31).

2. The patch slicing device with a retractable rotary cutting blade according to claim 1, characterized in that, Also includes: Two imaging rings (212) are located on the surface of the rotary cutting guide (1), and the two imaging rings (212) are located at the two ends of the blade holder (31); The rotating part (4) is sleeved on the end of the rotary cutting guide (1) away from the rotary cutting part (3); An indicator plate (5) is provided on the rotating part (4), and the diameter of the indicator plate (5) is aligned with the direction of the rotary cut (2).

3. A patch slicing device with a retractable rotary cutter according to claim 2, characterized in that, The rotary cutting catheter (1) has an annular channel (11) inside, and the balloon (21) has an infusion channel. The annular channel (11) is connected to the infusion channel. Filler is injected into the annular channel (11) to push out the balloon (21) and thus raise the knife holder (31).

4. A patch slicing device with a retractable rotary cutting blade according to claim 3, characterized in that, The balloon (21) is arranged around the outer wall of the rotary cutting catheter (1), and the diameter of the rotary cutting is equal to the diameter of the balloon (21).

5. A patch slicing device with a retractable rotary cutting blade according to claim 4, characterized in that, The expander (6) has a connecting groove (7) on its side, and the top of the connecting groove (7) is connected and matched with the rotary cut (2).

6. A patch slicing device with a retractable rotary cutting blade according to claim 5, characterized in that, The end face of the rotating part (4) is fitted with a moiré pattern (12).

7. A patch slicing device with a retractable rotary cutting blade according to claim 6, characterized in that, The end of the connecting groove (7) away from the expander (6) is provided with a support ring (8) and a protective member (9), and the protective member (9) is an integrally formed flexible conical structure.

8. A patch slicing device with a retractable rotary cutter according to claim 7, characterized in that, The bottom outer wall of the annular channel (11) is connected to a one-way valve (13).

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