Knife tube assembly and medical planing device

Abstract

According to the knife tube assembly and the medical planing device, in the using process, an inner knife tube is driven by a power handle to rotate around the axial direction of the inner knife tube, and due to the fact that the circumferential side wall of the knife head end is provided with at least two first planing knife edges which are arranged at intervals, the inner knife tube can rotate around the axial direction of the inner knife tube; therefore, in the process that the inner knife tube rotates by one circle around the axial direction of the inner knife tube, each first planing knife edge can complete at least one time of tissue suction and at least one time of planing and cutting operation, that is, the inner knife tube rotates by one circle around the axial direction of the inner knife tube and at least two times of planing and cutting operation can be completed. The frequency and the possibility of sucking the tissue into the suction channel through the first planing knife edge are improved, and the cutting efficiency is also improved; moreover, as the circumferential radial area of the inner cutter tube is reduced, the friction between the inner cutter tube and the outer cutter tube is reduced in the rotating process, the reduction of friction heat is facilitated, the abrasion of the cutting edge is slowed down, and the cutter assembly is more durable.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a cutter tube assembly and a medical shaving device. Background Art

[0002] Medical shaving devices are used to shave and excise tissues at the affected area during surgical operations. The medical shaving device includes a hollow inner cutter tube and an outer cutter tube sleeved on the inner cutter tube, and shaving cutters are correspondingly arranged on both the outer cutter tube and the inner cutter tube. In specific use, by the relative rotation between the inner cutter tube and the outer cutter tube, and by applying negative pressure to the inner cutter tube, tissues are inhaled and excised, and the excised tissues are aspirated and removed.

[0003] During the shaving and excision process, when the inner cutter tube rotates one week relative to the outer cutter tube, the two shaving cutters only overlap once, so the tissues can only be inhaled and excised once, and the excision efficiency is low. Moreover, when the rotation speed of the inner cutter tube relative to the outer cutter tube is too fast, it will affect the tissue inhalation, further reducing the excision efficiency. Summary of the Utility Model

[0004] Based on this, in view of the problem of low excision efficiency, it is necessary to provide a cutter tube assembly and a medical shaving device.

[0005] The technical solution is as follows:

[0006] On the one hand, a cutter tube assembly is provided, and the cutter tube assembly includes:

[0007] An outer cutter tube, which is provided with an installation cavity extending axially;

[0008] An inner cutter tube, which is rotatably arranged in the installation cavity along the axis; the inner cutter tube includes a cutter head end, and a suction channel extending axially to the cutter head end is arranged inside the inner cutter tube, and at least two spaced-apart first shaving cutters are arranged on the circumferential side wall of the cutter head end, and each first shaving cutter is communicated with the suction channel.

[0009] The technical solution is further described below:

[0010] In one embodiment, at least one side of at least one of the first shaving cutters is provided with a first type of shaving blade, and at least one side of at least one of the first shaving cutters is provided with a second type of shaving blade, and the blade form of the first type of shaving blade is different from the blade form of the second type of shaving blade.

[0011] In one embodiment, the first type of planing blade includes at least two serration structures arranged and adjacent to each other along the axial direction of the inner blade tube, the serration structure includes an outer blade surface facing outward, an inner blade surface opposite to the outer blade surface, and a blade surface located between the outer blade surface and the inner blade surface, the outer blade surface and the inner blade surface are both connected to the blade surface, and the angle between the blade surface and the outer blade surface is an acute angle; the second type of planing blade includes a row of blade structures extending along the axial direction of the inner blade tube.

[0012] In one embodiment, the number of the first planing blades is two, and the two first planing blades are arranged at an interval relative to each other along the radial direction of the inner blade tube.

[0013] In one of the embodiments, the outer blade tube is provided with at least one second planing blade edge communicating with the mounting cavity, and at least one of the second planing blade edges can be correspondingly communicated with at least one of the first planing blade edges along the radial direction of the outer blade tube.

[0014] In one embodiment, the second planing blade is provided with at least a third type of planing blade; the blade form of the third type of planing blade is different from or the same as the blade form of the first type of planing blade; the blade form of the third type of planing blade is different from or the same as the blade form of the second type of planing blade.

[0015] In one embodiment, the second planing blade is provided as one, and at least two of the first planing blades can be respectively connected with the second planing blade along the radial direction of the outer blade tube.

[0016] In one embodiment, there are at least two second planing blades, at least two of which are spaced apart from each other along the circumferential side wall of the outer blade tube, and at least two of the second planing blades can be arranged in one-to-one correspondence with at least two of the first planing blades.

[0017] In one embodiment, the top profile of the blade tip is arc-shaped.

[0018] On the other hand, a medical shaver is provided, comprising a power handle and the knife tube assembly, wherein the power handle is drivingly connected to an end of the inner knife tube away from the knife head end.

[0019] In the use process of the cutter tube assembly and the medical planing device of the above embodiments, the inner cutter tube is driven by the power handle to rotate around its own axis. Since at least two spaced-apart first planing blades are provided on the circumferential side wall of the cutter head end, each first planing blade can at least complete one tissue suction and at least one planing resection operation during one rotation of the inner cutter tube around its own axis. That is, the inner cutter tube can at least complete two planing resection operations during one rotation around its own axis, which improves the number and possibility of sucking the tissue into the suction channel through the first planing blade, and also improves the resection efficiency. Moreover, since the area of the inner cutter tube in the circumferential radial direction is reduced, the friction with the outer cutter tube is reduced during rotation, which is beneficial to reducing the frictional heat, slowing down the wear of the cutting edge, and making the tool assembly more durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings forming a part of this application are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is a schematic structural diagram of a medical planing device for an embodiment;

[0023] Figure 2 is Figure 1 a partial enlarged view of part A of the medical planing device;

[0024] Figure 3 is Figure 1 a schematic structural diagram of the cutter head end of the inner cutter tube of the medical planing device;

[0025] Figure 4 is Figure 3 a front view of an embodiment of the cutter head end;

[0026] Figure 5 is Figure 3 a front view of another embodiment of the cutter head end.

[0027] Description of the reference numerals:

[0028] 10. Medical shaving device; 100. Inner cutter tube; 110. Cutter head end; 111. Suction channel; 112. First shaving blade edge; 113. First type of shaving blade; 1131. Outer blade surface; 1132. Inner blade surface; 1133. Blade edge surface; 114. Second type of shaving blade, 200. Outer cutter tube; 210. Second shaving blade edge; 220. Third type of shaving blade; 300. Power handle. Detailed implementation manner

[0029] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the following detailed description of the specific implementation manner of the present utility model will be given with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0030] As Figure 1 shown, in one embodiment, a medical shaving device 10 is provided, which includes a power handle 300 and a cutter tube assembly, so as to provide power for the cutter tube assembly through the power handle 300 to shave and excise the tissue at the affected area, and the excision efficiency is high.

[0031] It should be noted that the power handle 300 can adopt existing structures or components, as long as it can provide power for the shaving and excision of the cutter tube assembly, and no limitation is made here.

[0032] In one embodiment, a cutter tube assembly is provided, which includes an inner cutter tube 100 and an outer cutter tube 200. As Figure 1 and Figure 2 shown, the outer cutter tube 200 is provided with an installation cavity extending along the axial direction, and the inner cutter tube 100 is rotatably arranged along the axis in the installation cavity. In this way, under the drive of the power handle 300, the inner cutter tube 100 can rotate relative to the outer cutter tube 200. As Figure 3 and Figure 4As shown in the figure, the inner cutter tube 100 includes a cutter head end 110, that is, one end of the inner cutter tube 100 away from the power handle 300 has a cutter head end 110. And, a suction channel 111 extending axially to the cutter head end 110 is provided inside the inner cutter tube 100, so that samples such as excised tissues can be sucked out by means of vacuum through the suction channel 111. Moreover, at least two spaced-apart first cutting edges 112 are provided on the circumferential side wall of the cutter head end 110, and each first cutting edge 112 is communicated with the suction channel 111, so that tissues can be sucked into the suction channel 111 through the first cutting edges 112 to complete the cutting and excision operation, and the cut tissues can be sucked out through the suction channel 111. At the same time, the power handle 300 is drivingly connected to the end of the inner cutter tube 100 away from the cutter head end 110 by means of clamping or plugging, etc., so that the power handle 300 can drive the inner cutter tube 100 to rotate around its own axis.

[0033] It should be noted that sucking the tissue into the suction channel 111 through the first cutting edge 112 can be achieved by evacuating the suction channel 111, such as negative pressure suction. Since it can be achieved by existing means, it is not limited here.

[0034] During the use of the cutter tube assembly of the above embodiment, the power handle 300 drives the inner cutter tube 100 to rotate around its own axis. Since at least two spaced-apart first cutting edges 112 are provided on the circumferential side wall of the cutter head end 110, each first cutting edge 112 can at least complete one tissue suction and at least one cutting and excision operation during one rotation of the inner cutter tube 100 around its own axis. That is, the inner cutter tube 100 can at least complete two cutting and excision operations during one rotation around its own axis, which improves the number and possibility of sucking the tissue into the suction channel 111 through the first cutting edge 112, and also improves the excision efficiency; and, since the area of the inner cutter tube 100 in the circumferential radial direction is reduced, the friction with the outer cutter tube 200 is reduced during rotation, which is beneficial to reducing the frictional heat, slowing down the wear of the cutting edge, and making the tool assembly more durable.

[0035] Such as Figure 3 、 Figure 4 and Figure 5As shown, in one embodiment, at least one side of at least one first shaving edge 112 is provided with a first type of shaving blade 113. Optionally, the first type of shaving blade 113 at least includes a blade structure that extends along the axial direction of the inner cutter tube 100 and is capable of shaving and excising tissue. This blade structure can be serrated, can be blade-shaped, or can also be other structures capable of excising tissue. And, at least one side of at least one first shaving edge 112 is provided with a second type of shaving blade 114. Optionally, the second type of shaving blade 114 at least includes a blade structure that extends along the axial direction of the inner cutter tube 100 and is capable of shaving and excising tissue. This blade structure can be serrated, can be blade-shaped, or can also be other structures capable of excising tissue. At the same time, the blade form of the first type of shaving blade 113 is different from the blade form of the second type of shaving blade 114. In this way, during the rotation of the inner cutter tube 100 around its own axis, there are at least two different cutting forms, which can adapt to different types of tissue excision requirements and ensure the excision effect.

[0036] It should be noted that at least one first shaving edge 112 refers to at least one of all the first shaving edges 112, which can refer to one, two, or more of all the first shaving edges 112.

[0037] It should be noted that at least one side of the first shaving edge 112 is provided with the first type of shaving blade 113, which can mean that the first shaving edge 112 is completely provided with the first type of shaving blade 113; or it can mean that the first shaving edge 112 is partially provided with the first type of shaving blade 113 while the other part is provided with other types of shaving blades. For example, in one embodiment, both sides of the first shaving edge 112 are provided with blade structures that extend along the axial direction of the inner cutter tube 100. At this time, it can be that the blade structure on one side is the first type of shaving blade 113 while the blade structure on the other side is other types of shaving blades, or it can be that the blade structures on both sides are the first type of shaving blade.

[0038] It should be noted that at least one side of the first shaving edge 112 is provided with the second type of shaving blade 114, which can mean that the first shaving edge 112 is completely provided with the second type of shaving blade 114; or it can mean that the first shaving edge 112 is partially provided with the second type of shaving blade 114 while the other part is provided with other types of shaving blades. For example, in one embodiment, both sides of the first shaving edge 112 are provided with blade structures that extend along the axial direction of the inner cutter tube 100. At this time, it can be that the blade structure on one side is the second type of shaving blade 114 while the blade structure on the other side is other types of shaving blades, or it can be that the blade structures on both sides are the second type of shaving blade 114.

[0039] In one embodiment, in one of the first shaving cutting edges 112, the cutting edge structure on one side is the first type of shaving cutting edge 113 and the cutting edge structure on the other side is the second type of shaving cutting edge 114, so that the first shaving cutting edge 112 can meet the requirements of two different types of tissue resection.

[0040] As Figure 5 shown, in one embodiment, serrated cutting edge structures are provided on both sides of at least one first shaving cutting edge 112, and blade-shaped cutting edge structures are provided on both sides of at least one first shaving cutting edge 112, so that the inner cutter tube 100 can meet the requirements of two different types of tissue resection.

[0041] As Figure 3 shown, optionally, the cutting edge structure of the first type of shaving cutting edge 113 is serrated, and the cutting edge structure of the second type of shaving cutting edge 114 is blade-shaped. Specifically, the first type of shaving cutting edge 113 includes at least two serrated structures arranged axially along the inner cutter tube 100 and adjacent to each other. The serrated structure includes an outer cutting surface 1131 facing outward, an inner cutting surface 1132 opposite to the outer cutting surface 1131, and a cutting edge surface 1133 located between the outer cutting surface 1131 and the inner cutting surface 1132. Moreover, both the outer cutting surface 1131 and the inner cutting surface 1132 are connected to the cutting edge surface 1133, and the angle between the cutting edge surface 1133 and the outer cutting surface 1131 is set to be an acute angle. In this way, the first type of shaving cutting edge 113 is sharper, can more smoothly and efficiently resect the inhaled tissue, improves the surgical efficiency, shortens the surgical time, can also reduce the pain of the patient, and at the same time can reduce the treatment cost. At the same time, the second type of shaving cutting edge 114 includes a row of blade structures extending axially along the inner cutter tube 100. In this way, using the serrated structure and the blade structure to resect the tissue enables the inner cutter tube 100 to meet the requirements of both hard tissue resection and soft tissue resection, and can adapt to more usage scenarios.

[0042] It should be noted that facing outward means the direction radially away from the suction channel 111 along the inner cutter tube 100.

[0043] Among them, the number of the first shaving cutting edges 112 can be flexibly designed according to actual usage needs, for example, it can be two, three or more.

[0044] As Figure 3As shown, in one embodiment, the first cutting edges 112 are provided in two. In this way, during the process of the inner cutter tube 100 rotating one full circle around its own axis, both of the two first cutting edges 112 can at least complete one tissue suction and at least one cutting operation, that is, the inner cutter tube 100 rotating one full circle around its own axis can at least complete two cutting operations, which improves the number and possibility of sucking the tissue into the suction channel 111 through the first cutting edges 112, and also improves the cutting efficiency. Moreover, the two first cutting edges 112 are arranged at intervals relative to each other along the radial direction of the inner cutter tube 100, that is, the two first cutting edges 112 are axially symmetric about the suction channel 111 along the radial direction of the inner cutter tube 100. This not only facilitates processing but also ensures the consistency and reliability of cutting.

[0045] In addition, the outer cutter tube 200 is provided with at least one second cutting edge 210 communicating with the installation cavity, and moreover, at least one second cutting edge 210 can communicate with at least one first cutting edge 112 correspondingly along the radial direction of the outer cutter tube 200. In this way, when the outer cutter tube 200 is inserted into the affected area and the inner cutter tube 100 rotates relative to the outer cutter tube 200, when the first cutting edge 112 and the second cutting edge 210 communicate correspondingly along the radial direction of the outer cutter tube 200, the tissue can be sucked into the suction channel 111 through the second cutting edge 210 and the first cutting edge 112, and then the cutting operation can be completed by using the relative shearing force during the rotation of the inner cutter tube 100 relative to the outer cutter tube 200, and finally the cut tissue is sucked out through the suction channel 111. At the same time, when the inner cutter tube 100 rotates one full circle relative to the outer cutter tube 200, at least two first cutting edges 112 can both communicate with at least one second cutting edge 210 correspondingly once, that is, the inner cutter tube 100 rotating one full circle around its own axis can at least complete two cutting operations, which improves the number and possibility of sucking the tissue into the suction channel 111 through the first cutting edges 112, and also improves the cutting efficiency.

[0046] Such as Figure 2As shown, further, the second shaving edge 210 is at least provided with a third type of shaving blade 220. Optionally, the third type of shaving blade 220 at least includes a blade structure that extends along the axial direction of the outer cutter tube 200 and can shave and excise tissue. This blade structure can be serrated, can be blade-shaped, or can be other structures capable of excising tissue. In this way, during the process of the inner cutter tube 100 rotating relative to the outer cutter tube 200 around its own axis, the third type of shaving blade 220 of the second shaving edge 210 shears and excises the inhaled tissue, and the excised tissue is sucked out through the suction channel 111. Moreover, the blade form of the third type of shaving blade 220 is different from or the same as that of the first type of shaving blade 113; the blade form of the third type of shaving blade 220 is different from or the same as that of the second type of shaving blade 114. In this way, when the second shaving edge 210 communicates with different first shaving edges 112 correspondingly, the third type of shaving blade 220 and the first type of shaving blade 113 and / or the second type of shaving blade 114 cooperate to work and at least have two different cutting forms, which can adapt to different types of tissue excision requirements, ensure the excision effect, and the relative shearing movement between the third type of shaving blade 220 and the first type of shaving blade 113 and / or the second type of shaving blade 114 can more smoothly and efficiently excise the inhaled tissue, improve the surgical efficiency, shorten the surgical time, reduce the pain of the patient, and at the same time can also reduce the treatment cost.

[0047] It should be noted that the second shaving edge 210 is at least provided with a third type of shaving blade 220, which can mean that the second shaving edge 210 is completely provided with the third type of shaving blade 220; or it can mean that the second shaving edge 210 is partially provided with the third type of shaving blade 220 and the other parts are provided with other types of shaving blades. For example, in one embodiment, both sides of the second shaving edge 210 are provided with blade structures that extend along the axial direction of the outer cutter tube 200. At this time, it can be that one row of blade structures is the third type of shaving blade 220 and the other row of blade structures is other types of shaving blades, or both rows of blade structures are the third type of shaving blade 220.

[0048] In one embodiment, the blade form of the third type of shaving blade 220 is different from that of the first type of shaving blade 113, and the blade form of the third type of shaving blade 220 is different from that of the second type of shaving blade 114.

[0049] In one embodiment, the blade form of the third type of shaving blade 220 is different from that of the first type of shaving blade 113, and the blade form of the third type of shaving blade 220 is the same as that of the second type of shaving blade 114.

[0050] In one embodiment, the blade form of the third type of shaving blade 220 is the same as that of the first type of shaving blade 113, and the blade form of the third type of shaving blade 220 is different from that of the second type of shaving blade 114.

[0051] Among them, the number of the second shaving cutting edges 210 can be flexibly designed according to actual usage needs. For example, it can be two, three or more.

[0052] In one embodiment, the second shaving cutting edge 210 is set to one, and at least two first shaving cutting edges 112 can be respectively and correspondingly communicated with the second shaving cutting edge 210 along the radial direction of the outer cutter tube 200. For example: the outer cutter tube 200 is provided with one second shaving cutting edge 210, and the inner cutter tube is provided with two first shaving cutting edges 112. Each first shaving cutting edge 112 can be respectively and correspondingly communicated with this second shaving cutting edge 210 at different times. In this way, during the process that the inner cutter tube 100 rotates around its own axis relative to the outer cutter tube 200, each first shaving cutting edge 112 can be respectively and correspondingly communicated with the second shaving cutting edge 210, that is, when the inner cutter tube 100 rotates around its own axis for one week, at least two shaving and cutting operations can be completed, which improves the number and possibility of sucking the tissue into the suction channel 111 through the first shaving cutting edge 112, also improves the cutting efficiency, and at the same time, can ensure that the suction channel 111 has sufficient suction force on the second shaving cutting edge 210 to ensure the suction effect.

[0053] In one embodiment, the second shaving cutting edges 210 are set to at least two, and at least two second shaving cutting edges 210 are arranged at intervals along the circumferential side wall of the outer cutter tube 200. Each first shaving cutting edge 112 can be respectively and correspondingly communicated with these two second shaving cutting edges 210 at different times. Further, at least two second shaving cutting edges 210 can be arranged in one-to-one correspondence with at least two first shaving cutting edges 112. For example: the outer cutter tube 200 is provided with two second shaving cutting edges 210, and the inner cutter tube is provided with two first shaving cutting edges 112. The two first shaving cutting edges 112 can be respectively and correspondingly communicated with these two second shaving cutting edges 210 at the same time; another example: the outer cutter tube 200 is provided with three second shaving cutting edges 210, and the inner cutter tube is provided with two first shaving cutting edges 112. The two first shaving cutting edges 112 can be respectively and correspondingly communicated with two of these second shaving cutting edges 210 at the same time. In this way, during the process that the inner cutter tube 100 rotates around its own axis relative to the outer cutter tube 200, when one of the first shaving cutting edges 112 is respectively and correspondingly communicated with one of the second shaving cutting edges 210, the remaining first shaving cutting edges 112 are also respectively and correspondingly communicated with the remaining second shaving cutting edges 210, which increases the number and possibility of sucking the tissue into the suction channel 111 through the second shaving cutting edge 210 and the first shaving cutting edge 112, and improves the cutting efficiency.

[0054] Such as Figure 3 andFigure 4 As shown, in addition, the top contour of the cutter head end 110 is arc-shaped. In this way, the inner cutter tube 100 can rotate more smoothly relative to the outer cutter tube 200, avoiding jamming. Of course, the top contour of the cutter head end 110 can also be other shapes, as long as it satisfies that the inner cutter tube 100 can rotate smoothly relative to the outer cutter tube 200.

[0055] It should be noted that "a certain body" and "a certain part" can be a part of the corresponding "component", that is, "a certain body" and "a certain part" are integrally formed with the "other parts of the component"; or they can be an independent component separable from the "other parts of the component", that is, "a certain body" and "a certain part" can be manufactured independently and then combined with the "other parts of the component" to form a whole. The expressions of "a certain body" and "a certain part" in this application are only one embodiment for the convenience of reading, rather than a limitation on the protection scope of this application. As long as the above features are included and the functions are the same, it should be understood as an equivalent technical solution of this application.

[0056] It should be noted that the components included in the "unit", "component", "mechanism", and "device" of this application can also be flexibly combined, that is, modular production can be carried out according to actual needs to facilitate modular assembly. The division of the above components in this application is only one embodiment for the convenience of reading, rather than a limitation on the protection scope of this application. As long as the above components are included and the functions are the same, it should be understood as an equivalent technical solution of this application.

[0057] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 construed as a limitation on the present utility model. The term "and / or" used in the present utility model includes any and all combinations of one or more of the related listed items.

[0058] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0059] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0060] In the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0061] It should be noted that when an element is referred to as being "fixed to", "arranged on", "secured to" or "mounted on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. Further, when an element is considered to be "fixedly drivingly connected" to another element, the two can be fixed in a detachable connection manner or a non-detachable connection manner, as long as power transmission can be achieved, such as socket connection, snap connection, integral molding fixation, welding, etc., which can be achieved in the prior art and will not be elaborated here. When an element is perpendicular or approximately perpendicular to another element, it means that the ideal state of the two is perpendicular, but due to the influence of manufacturing and assembly, there may be a certain vertical error. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0062] It should also be understood that when interpreting the connection relationship or position relationship of elements, although not clearly described, the connection relationship and position relationship are interpreted to include an error range, and this error range should be within the acceptable deviation range of a specific value determined by those skilled in the art. For example, "about", "approximate" or "substantially" may mean within one or more standard deviations, which is not limited herein.

[0063] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0064] The above embodiments only express several implementation manners of the present utility model, and the description thereof is relatively specific and detailed. However, it should not be construed as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several variations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A knife tube assembly, characterized in that: The knife tube assembly comprises: An outer knife tube, wherein the outer knife tube is provided with a mounting cavity extending in the axial direction; An inner knife tube, which can be rotatably arranged along the axis in the installation cavity; the inner knife tube includes a cutter head end, and a suction channel is provided inside the inner knife tube and extends axially to the cutter head end, and the circumferential side wall of the cutter head end is provided with at least two mutually spaced first planing cutting edges, and each of the first planing cutting edges is connected to the suction channel.

2. The knife tube assembly according to claim 1, characterized in that: At least one side of at least one of the first planing edges is provided with a first type planing edge, and at least one side of at least one of the first planing edges is provided with a second type planing edge, and the edge form of the first type planing edge is different from the edge form of the second type planing edge.

3. The knife tube assembly according to claim 2, characterized in that: The first type of planing blade includes at least two serration structures arranged and adjacent to each other along the axial direction of the inner blade tube, the serration structure includes an outer blade surface facing outward, an inner blade surface opposite to the outer blade surface, and a blade surface located between the outer blade surface and the inner blade surface, the outer blade surface and the inner blade surface are both connected to the blade surface, and the angle between the blade surface and the outer blade surface is an acute angle; the second type of planing blade includes a row of blade structures extending along the axial direction of the inner blade tube.

4. The knife tube assembly according to claim 1, characterized in that: There are two first planing blades, and the two first planing blades are arranged at intervals relative to each other along the radial direction of the inner blade tube.

5. The knife tube assembly according to any one of claims 1 to 4, characterized in that: The outer blade tube is provided with at least one second planing blade edge communicating with the mounting cavity, and at least one second planing blade edge can be correspondingly communicated with at least one first planing blade edge along the radial direction of the outer blade tube.

6. The knife tube assembly according to claim 5, characterized in that: The second planing blade is provided with at least a third type of planing blade; the blade form of the third type of planing blade is different from or the same as the blade form of the first type of planing blade; the blade form of the third type of planing blade is different from or the same as the blade form of the second type of planing blade.

7. The knife tube assembly according to claim 5, characterized in that: The second planing blade is provided as one, and at least two of the first planing blades can be respectively connected with the second planing blade along the radial direction of the outer blade tube.

8. The knife tube assembly according to claim 5, characterized in that: There are at least two second planing blades, and the at least two second planing blades are spaced apart from each other along the circumferential side wall of the outer blade tube, and the at least two second planing blades can be arranged in one-to-one correspondence with the at least two first planing blades.

9. The knife tube assembly according to any one of claims 1 to 4, characterized in that: The top profile of the blade tip end is arc-shaped.

10. A medical planing device, characterized in that: It comprises a power handle and a knife tube assembly as claimed in any one of claims 1 to 9, wherein the power handle is drivingly connected to an end of the inner knife tube away from the knife head end.

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