Rotary cutter
By designing the extrusion function of flowing through the channel and the variable diameter end on the rotary cutting knife, the resistance problem of the rotary cutting knife when cutting the thrombus is solved, and the efficiency of thrombectomy and accumulation avoidance is achieved.
Patent Information
- Application Number
- CN202421645611.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-12
AI Technical Summary
Existing rotary cutting knives are susceptible to thrombus resistance when cutting thrombus, and the removed thrombus cannot be quickly aspirated and eliminated, resulting in the accumulation of thrombus and increasing resistance.
A rotary cutting knife is designed, including a support seat, a guide tube and a cutter piece. The support seat is equipped with a flow passage along the direction of the thrombus flow, which is used to suction and break the thrombus; the end of the guide tube is a variable diameter end, which is used to squeeze the thrombus and reduce resistance; the cutter piece is arranged along the circumference of the guide tube and gathered to the variable diameter end for a fixed connection.
By providing the squeezing function of the suction channel and the variable diameter end, the resistance of the rotary cutter when cutting the thrombus is reduced, the efficiency of thrombus removal is improved, and the accumulation of thrombus blocks is avoided.
Smart Images
Figure CN222870596U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical equipment, and more specifically relates to a rotary cutter. Background Art
[0002] The field of medical device technology covers the design, manufacture and application of various equipment and tools for healthcare and medical research. These technologies include medical imaging equipment (such as X-ray, MRI and ultrasound), surgical tools, medical devices (such as pacemakers and artificial organs), and various clinical and laboratory instruments. Among them, surgical tools are an indispensable part of medical device technology and are mainly used in various surgical and medical operations. These tools include rotary cutters, forceps, scissors, needles, various forceps and clavicle clamps. In surgery, rotary cutters are often used in surgical scenarios such as skin cutting, tissue sampling, tumor resection, and blood clot fragmentation.
[0003] In the process of breaking up thrombi with existing rotary cutters, the end of the rotary cutter facing the thrombus is easily subject to resistance from the thrombus, which affects the cutting process. At the same time, the cut thrombus cannot be quickly suctioned out, so that the cut thrombus is easily accumulated on the rotary cutter, further increasing the resistance of the rotary cutter. Utility Model Content
[0004] The main purpose of the present application is to provide a rotary cutter that can reduce the resistance of the rotary cutter when cutting thrombus, while providing a channel for outward suction of broken thrombus, effectively preventing broken thrombus from accumulating on the rotary cutter.
[0005] In order to achieve the above-mentioned purpose, the present application proposes a rotary cutter, comprising:
[0006] A support seat, which is provided with a flow passage along the direction of thrombus flow;
[0007] A guide tube is fixed on the support seat and extends along one end facing the thrombus, the end of the extension is a reduced diameter end, and is used to squeeze the thrombus to reduce the resistance of the cutter assembly;
[0008] A plurality of cutting blades are arranged along the circumference of the guide tube, and the plurality of cutting blades are gathered to the diameter-reducing end in a radial structure and are fixedly connected to the diameter-reducing end.
[0009] Furthermore, the cutting blade comprises:
[0010] The cutter body is fixed to the reducing end;
[0011] The blade is provided with a blade tip, the blade is fixed on the blade body, and the angle between the blade body and the blade tip is an obtuse angle.
[0012] Furthermore, the connection portion between the blade tip and the blade body is arc-shaped.
[0013] Furthermore, the angle between the blade body and the blade tip is 120° to 135°.
[0014] Furthermore, the area of the region enclosed by the blades is smaller than the area of the cross section of the support seat.
[0015] Furthermore, a first diameter-changing portion is provided on one end of the guide tube facing the support seat, and a diameter of the first diameter-changing portion gradually increases toward the support seat.
[0016] Furthermore, the diameter-changing end is a second diameter-changing portion, and the diameter of the second diameter-changing portion gradually decreases toward the thrombus.
[0017] Furthermore, the support seat includes an outer ring, a plurality of support edges are fixedly connected to the inner wall of the outer ring, the guide tube is fixed on the support edge, and a flow channel is formed among the guide tube, the outer ring and the support edge.
[0018] The rotary cutter proposed by the utility model has the following beneficial effects:
[0019] The utility model provides a flow channel along the flow direction of the thrombus on the support seat to provide a channel for outward suction of the broken thrombus, and the broken thrombus can be smoothly discharged from the outer end of the catheter along the channel, effectively avoiding the accumulation of broken thrombus on the rotary cutter. The reduced diameter end is convenient for squeezing into the thrombus, thereby reducing the resistance encountered by the rotary cutter when cutting the thrombus and improving the efficiency of thrombus removal. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of the overall structure of a rotary cutter of the utility model;
[0021] Figure 2 This is a schematic structural diagram of one embodiment of the cutting blade of the utility model;
[0022] Figure 3 It is a partial cross-sectional structural schematic diagram of a rotary cutter of the utility model;
[0023] Figure 4 This is a positional relationship diagram of the outer ring and the guide tube of the utility model.
[0024] In the figure, 1, outer ring, 2, supporting edge, 3, cutting piece, 31, blade, 32, knife body, 4, guide tube, 41, first diameter reducing part, 42, second diameter reducing part. DETAILED DESCRIPTION
[0025] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
[0026] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.
[0027] Example
[0028] In the process of breaking up thrombi with existing rotary cutters, the end of the rotary cutter facing the thrombus is easily subject to resistance from the thrombus, which affects the cutting process. At the same time, the cut thrombus cannot be quickly suctioned out, so that the cut thrombus is easily accumulated on the rotary cutter, further increasing the resistance of the rotary cutter.
[0029] Based on this, in order to solve the technical problem that the end of the rotary cutter facing the thrombus is easily subject to thrombus resistance, reference Figure 1 and Figure 4 , this embodiment provides a rotary cutter, including: a support seat composed of an outer ring 1 and a support rib 2, a guide tube 4 fixed with the support rib 2, and a cutter piece 3 mounted on the guide tube 4. Among them, three support ribs 2 are fixedly connected to the inner wall of the outer ring 1, and a receiving area is formed between the three support ribs 2, and the guide tube 4 is fixed in the receiving area. At the same time, one end of the guide tube 4 (i.e., the end facing the thrombus) can extend to the outer end of the receiving area. Among them, the extended end is a reducing end, which is used to squeeze the thrombus to reduce the resistance of the cutter piece 3. Three cutter pieces 3 are arranged along the circumferential direction of the guide tube 4, and the three cutter pieces 3 are radially structured toward the reducing end of the guide tube 4, and finally gather to the reducing end and are fixedly connected to the reducing end. In this embodiment, a flow channel is formed between the guide tube 4, the outer ring 1, and the support rib 2, and the flow channel is used to guide the thrombus to be quickly sucked out. The ring-shaped support seat is helpful to save space and consumables on the one hand; on the other hand, the whole body has no edges and corners, thereby effectively avoiding bleeding caused by friction between the edges and the blood vessel wall. The radial gathering form can be linear, that is, any one of the cutter parts 3 presents a plane along the direction of the reduced diameter end of the guide tube 4. The radial gathering form can also be spiral, that is, any one of the cutter parts 3 presents a spiral surface along the direction of the reduced diameter end of the guide tube 4.
[0030] In this embodiment, a flow channel is formed between the guide tube 4, the outer ring 1, and the support edge 2 to provide a channel for outward suction of broken thrombi, which helps the broken thrombi to be smoothly discharged from the outer end of the catheter along the channel, effectively avoiding the accumulation of broken thrombi on the rotary cutter. The variable diameter end facilitates squeezing into the thrombus, thereby reducing the resistance encountered by the rotary cutter when cutting the thrombus and improving the efficiency of thrombus removal. Among them, the number of support edges 2 and the number of cutting blades 3 can be a one-to-one correspondence, or a non-correspondence. The above embodiment is for the number of support edges 2 and cutting blades 3 in order to combine with the accompanying drawings to specifically illustrate the specific structure of one embodiment of the support edge 2 or the cutting blade 3. In the present utility model, the number of support edges 2 and the cutting blade 3 is not limited.
[0031] In actual use scenarios, the rotary cutter referred to in this embodiment slides in a catheter, and the guide tube 4 of the rotary cutter is used to insert the guide wire, and the rotary cutter can be driven from the outside by a driving rod, and is placed in the catheter under the drive of the driving rod, and can rotate in the catheter to cut the thrombus. The driving method of the rotary cutter is not limited, and it can be electrically driven or hydraulically driven. In addition, the flow channel is used to connect an external suction device, such as a medical suction pump, etc., for sucking broken thrombi. The driving process and the suction process are not the technical problems to be solved by the utility model, so they are not described here.
[0032] It should be noted that the fixing method of the support rib 2 and the guide tube 4 is not limited to a non-detachable fixing connection method, and the so-called non-detachable fixing connection method includes welding, gluing with medical adhesives, etc. The fixing method of the support rib 2 and the guide tube 4 can also be a detachable fixing connection method, for example, the support rib 2 and the guide tube 4 can be detachably connected by a rib and a groove clamping method.
[0033] In some embodiments, reference Figure 2, the cutting blade 3 includes: a blade 31 and a blade body 32. Among them, the blade body 32 is fixedly installed at the reducing end, the blade 31 is fixed on the blade body 32, and the blade 31 is arranged opposite to the reducing end. A blade tip is provided at the top of the blade 31, and the angle between the blade body 32 and the blade tip is an obtuse angle. In this embodiment and the following embodiments, the end of the guide tube 4 close to the support seat is defined as the rear end of the guide tube 4, and the end of the guide tube 4 away from the support seat is defined as the front end of the guide tube 4. Among them, the cross-section of the blade body 32 is radially close to the reducing end, so that the width of the blade body 32 gradually decreases toward the front end of the guide tube, so that the front end of the rotary cutter is generally conical, which helps to reduce the resistance when cutting thrombus. The blade body 32 and the blade tip are arranged at an obtuse angle, so that the contact area between the blade 31 and the thrombus becomes larger, so that more thrombus can be removed in a limited space. In this embodiment, the blade body 32 can be directly and fixedly connected to the extended part of the guide tube, presenting a polygonal structure (in Figure 1 The blade body 32 has a triangular structure, and the polygon can be a triangle, a quadrilateral, a pentagon, etc. The shape of the polygon depends on the number of blade bodies 32 arranged along the circumference of the guide tube 4. At this time, the blade body 32 itself plays the role of a reinforcing rib, thereby improving the reliability and stability of the rotary cutting of thrombus. Among them, a transition section is preset at one end of the blade body 32 facing the variable diameter end of the guide tube 4, and the transition section can be adapted to the variable diameter end, and the transition section is fixedly connected to the variable diameter end. The transition section can fit well with the variable diameter end, thereby avoiding the presence of a gap between the blade body 32 and the variable diameter end of the guide tube 4, which may cause the broken thrombus to be stuck in the gap. When too much thrombus is stuck, it may interfere with the normal operation of the cutting blade 3. In addition, the blade body 32 can also present a hollow design with the extension part of the guide tube, and the hollow part is used to guide and squeeze the broken thrombus into the flow channel, so that the broken thrombus can be quickly sucked out from the flow channel.
[0034] It should be noted that, through testing and adjustment by technicians in this field, the angle between the blade body 32 and the blade tip is in the range of 120° to 135°, which is the optimal angle range. Within this range, the best thrombus fragmentation effect can be ensured.
[0035] In some embodiments, the connection between the blade tip and the blade body 32 is arc-shaped. The arc-shaped structure is a transition zone between the blade tip and the blade body 32. On the one hand, the blade tip and the blade body 32 can be quickly connected together through the arc-shaped structure process to prevent cracks from appearing at the connection between the blade tip and the blade body 32; on the other hand, the arc-shaped structure is a smooth transition zone, which can effectively avoid interference with the non-cutting area, thereby ensuring that the non-cutting area will not be cut due to edges or cracks.
[0036] In order to prevent the tip of the blade 31 from interfering with the catheter when the rotary cutter rotates in the catheter, thereby preventing the catheter from rupturing, the area enclosed by the blade 31 is smaller than the cross-sectional area of the support seat. Thus, the rotation radius of the blade 31 is smaller than the rotation radius of the support seat, so that the tip of the blade 31 cannot touch the inner wall of the catheter during the rotary cutting process, thereby preventing the catheter from rupturing.
[0037] In some embodiments, reference Figure 3 The inner diameter of the rear end of the guide tube is provided with a first diameter reducing portion 41 which gradually decreases toward the front end of the guide tube. The cross section of the first diameter reducing portion 41 is an arc structure to facilitate the guide wire to pass through. The outer diameter of the front end of the guide tube is provided with a second diameter reducing portion 42 which gradually decreases toward the front end of the guide tube to facilitate squeezing into the thrombus.
[0038] In the above embodiment, a mounting sleeve may be preset at the center of the support seat, and the mounting sleeve is directly sleeved on the guide tube 4, and the support edge 2 is fixedly mounted in the circumferential direction of the mounting sleeve. This structure increases the stability between the guide tube 4 and the support seat.
[0039] In the description of the present invention, it should be understood that the terms "front end", "rear end", "axial", "circumference", "upper", "lower", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0040] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0041] The above is only for explaining the implementation mode of the utility model and is not used to limit the utility model. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the utility model without creative work should be included in the protection scope of the utility model.
Claims
1. A rotary cutter, characterized in that: include: A support seat, which is provided with a flow passage along the direction of thrombus flow; A guide tube is fixed on the support seat and extends along one end facing the thrombus, the end of the extension is a reduced diameter end, and is used to squeeze the thrombus to reduce the resistance of the cutter assembly; A plurality of cutting blades are arranged along the circumference of the guide tube, and the plurality of cutting blades are gathered to the diameter-reducing end in a radial structure and are fixedly connected to the diameter-reducing end.
2. A rotary cutter according to claim 1, characterized in that: The cutting blade comprises: The cutter body is fixed to the reducing end; The blade is provided with a blade tip, the blade is fixed on the blade body, and the angle between the blade body and the blade tip is an obtuse angle.
3. A rotary cutter according to claim 2, characterized in that: The connection portion between the knife tip and the knife body is arc-shaped.
4. The rotary cutter according to claim 2, characterized in that: The included angle between the blade body and the blade tip is 120° to 135°.
5. The rotary cutter according to claim 2, characterized in that: The area of the region enclosed by the blades is smaller than the area of the cross section of the support seat.
6. The rotary cutter according to claim 1, characterized in that: A first diameter-changing portion is provided on one end of the guide tube facing the support seat, and a diameter of the first diameter-changing portion gradually increases toward the support seat.
7. The rotary cutter according to claim 1, characterized in that: The diameter-changing end is a second diameter-changing portion, and the diameter of the second diameter-changing portion gradually decreases toward the thrombus.
8. The rotary cutter according to claim 1, characterized in that: The support seat comprises an outer ring, a plurality of support edges are fixedly connected to the inner wall of the outer ring, the guide tube is fixed on the support edge, and a flow channel is formed among the guide tube, the outer ring and the support edge.