Inner cutter bar, medical cutter and medical grinding device

Abstract

The utility model relates to an inner cutter bar, a medical cutter and a medical grinding device. The inner cutter bar comprises a cutter head, a transition sleeve, a second connecting rod and a connecting sleeve. The tool bit comprises a grinding part and a first connecting rod, and the grinding part is connected with the first connecting rod. The second connecting rod is arranged in the transition sleeve in a penetrating mode and fixedly connected with the transition sleeve. The transition sleeve and the first connecting rod are both arranged in the connecting sleeve in a penetrating mode, the front end of the connecting sleeve is fixedly connected with the first connecting rod, and the rear end of the connecting sleeve is fixedly connected with the transition sleeve. The connecting sleeve is not directly connected with the second connecting rod, and the connecting sleeve is connected with the second connecting rod through the transition sleeve, so that the fracture defect caused by stress concentration in the working process at the connecting position when the second connecting rod and the connecting sleeve are directly connected can be prevented, and the safety is improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an internal blade holder, a medical cutting tool, and a medical grinding device. Background Technology

[0002] Medical grinding devices are surgical power devices used for things like grinding and cutting tissue. They are widely used in orthopedic or surgical fields such as spinal surgery, UBE (unilateral biportal endoscopic) surgery, arthroscopy, joint replacement of large and small bones, craniotomy, ENT surgery, transnasal skull base surgery, laparoscopic surgery, and cosmetic minimally invasive surgery.

[0003] In related technologies, medical grinding devices include an inner blade holder. The inner blade holder typically includes a blade head, a second connecting rod, and a connecting sleeve. The blade head is connected to the second connecting rod via the connecting sleeve. During use, the inner blade holder rotates at high speed, causing stress concentration at the welded joint between the connecting sleeve and the second connecting rod, which can easily lead to brittle fracture. This can cause the blade head to fall into the body and be difficult to remove, resulting in poor safety. Utility Model Content

[0004] Therefore, it is necessary to overcome the shortcomings of the existing technology and provide an internal tool holder, medical cutting tool and medical grinding device, which can effectively prevent stress concentration in the connecting sleeve during operation and thus improve safety.

[0005] An internal tool holder, the internal tool holder comprising:

[0006] The cutting head includes a grinding part and a first connecting rod, wherein the grinding part is connected to the front end of the first connecting rod;

[0007] The second connecting rod is disposed at the rear end of the first connecting rod;

[0008] A transition sleeve is fitted over the front end of the second connecting rod and fixedly connected to the second connecting rod.

[0009] A connecting sleeve is fitted over the transition sleeve and the first connecting rod. The front end of the connecting sleeve is fixedly connected to the first connecting rod, and the rear end of the connecting sleeve is fixedly connected to the transition sleeve.

[0010] In one embodiment, the front end of the connecting sleeve is welded to the first connecting rod, and the welding position between the front end of the connecting sleeve and the first connecting rod is the first welding point, which is located at the connection position between the first connecting rod and the grinding part.

[0011] In one embodiment, the rear end of the transition sleeve extends beyond the rear end of the connecting sleeve; and / or, the first connecting rod and the second connecting rod abut against each other axially.

[0012] In one embodiment, the front end of the second connecting rod is welded to the front end of the transition sleeve, and the connecting sleeve is configured as a closed circular sleeve from one end to the other.

[0013] In one embodiment, the inner wall of the transition sleeve is bonded and fixed to the outer wall of the second connecting rod; and / or, the inner wall of the transition sleeve is adapted to the shape of the outer wall of the second connecting rod.

[0014] A medical cutting tool includes an inner blade, a supporting handle, and an outer blade tube, the rear end of which is connected to the supporting handle. The inner blade is rotatably inserted through the outer blade tube and can also be rotatably inserted inside the supporting handle.

[0015] In one embodiment, the medical knife further includes a support tube; the rear end of the support tube is sleeved inside the front end of the outer knife tube and connected and fixed to the outer knife tube, the outer diameter of the support tube is smaller than the inner diameter of the outer knife tube; the connecting sleeve is sleeved inside the support tube.

[0016] In one embodiment, the medical cutting tool further includes a sealing sleeve disposed inside the outer blade tube, the inner blade rod passing through the sealing sleeve, and a gap between the outer wall of the inner blade rod and the inner wall of the sealing sleeve.

[0017] In one embodiment, the outer blade tube is provided with a pressure relief hole, which is located near the front end of the support handle, and the interior of the outer blade tube communicates with the outside through the pressure relief hole.

[0018] A medical grinding device, the medical grinding device comprising the aforementioned medical cutting tool.

[0019] In the aforementioned internal blade holder, medical cutting tool, and medical grinding device, the connecting sleeve is not directly welded to the second connecting rod. Instead, the connecting sleeve is connected to the second connecting rod through a transition sleeve. This prevents stress concentration at the connection point during operation from causing fracture defects when the second connecting rod and the connecting sleeve are directly welded, thus improving safety. Attached Figure Description

[0020] Figure 1 This is a structural diagram of a medical cutting tool according to an embodiment of this application.

[0021] Figure 2 for Figure 1 Sectional view of the structure at point AA.

[0022] Figure 3 for Figure 2 Enlarged structural diagram at point B.

[0023] Figure 4 for Figure 2 Enlarged structural diagram at point C.

[0024] Figure 5 for Figure 2 Enlarged structural diagram at point D.

[0025] Figure 6 for Figure 2 Enlarged structural diagram at point E.

[0026] Figure 7 This is a structural diagram of the inner tool holder according to an embodiment of this application.

[0027] Figure 8 for Figure 7 Cross-sectional view of the structure at FF.

[0028] 10. Support shank body; 20. Outer cutter tube; 21. Pressure relief hole; 30. Inner cutter bar; 31. Second connecting rod; 32. Cutter head; 321. Grinding section; 322. First connecting rod; 40. Sealing sleeve; 41. First sealing section; 42. Second sealing section; 50. First support sleeve; 60. Connecting sleeve; 70. Support tube; 80. Second support sleeve; 90. Transition sleeve; 91. First welding point; 92. Second welding point; 93. Third welding point; 94. Bearing; 95. First connector. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be noted that the rear end refers to the end of the instrument or component closer to the operator, and the front end refers to the end of the instrument or component farther from the operator; the axial direction refers to the direction parallel to the line connecting the center of the front and rear ends of the instrument or component, the radial direction refers to the direction perpendicular to the axial direction, and the circumferential direction refers to the direction surrounding the axial direction. It should be noted that the axial direction in this embodiment refers to... Figure 1 or Figure 3 The direction indicated by Z.

[0031] See Figures 1 to 3 , Figure 1A structural diagram of a medical cutting tool according to an embodiment of this application is shown. Figure 2 It shows Figure 1 Sectional view of the structure at point AA. Figure 3 It shows Figure 2 Enlarged structural view at point B. One embodiment of this application provides a medical cutting tool, comprising: a support handle 10, an outer blade tube 20, an inner blade shank 30, and a sealing sleeve 40. The rear end of the outer blade tube 20 is connected to the support handle 10. The inner blade shank 30 is rotatably inserted into the outer blade tube 20, and is also rotatably inserted inside the support handle 10. The sealing sleeve 40 is disposed inside the outer blade tube 20, specifically, for example, at the rear end of the outer blade tube 20. The inner blade shank 30 is inserted into the sealing sleeve 40, with the outer wall of the inner blade shank 30 and the inner wall of the sealing sleeve 40 spaced apart, the distance between the outer wall of the inner blade shank 30 and the inner wall of the sealing sleeve 40 being ≤0.05mm.

[0032] The aforementioned medical cutting tool, including a sealing sleeve 40 positioned between the inner blade shank 30 and the outer blade tube 20, with a distance of ≤0.05mm between the outer wall of the inner blade shank 30 and the inner wall of the sealing sleeve 40, serves to block liquid flow, providing excellent sealing performance and preventing liquid from flowing into the support handle 10 along the space between the inner blade shank 30 and the outer blade tube 20. Furthermore, the presence of the sealing sleeve 40 allows for a reduction in the outer diameter of the inner blade shank 30, resulting in a relatively lower linear velocity during high-speed rotation. This reduces heat generation during dynamic sealing, thereby minimizing wear and extending the tool's lifespan.

[0033] As an example, the outer diameter of the inner tool holder 30 can be set to 0.6mm to 1mm, specifically 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, etc., which can be flexibly adjusted and set according to actual needs.

[0034] Please see Figure 2 and Figure 3 In one embodiment, the sealing sleeve 40 includes a first sealing section 41 and a second sealing section 42 arranged sequentially along the liquid flow direction. The outer wall of the inner blade 30 and the inner wall of the first sealing section 41 are spaced apart to form a first gap. The outer wall of the inner blade 30 and the inner wall of the second sealing section 42 are spaced apart to form a second gap. The first gap is greater than the second gap, and the axial length of the first sealing section 41 is greater than the axial length of the second sealing section 42.

[0035] It should be noted that the direction of liquid flow refers to the direction from the front end of the inner tool holder 30 to the rear end.

[0036] With this configuration, the sealing sleeve 40 employs a two-stage seal to achieve a good sealing effect between the inner knife rod 30 and the outer knife tube 20. Because the first gap is larger than the second gap, the sealing performance of the second sealing section 42 is superior to that of the first sealing section 41. That is, the first sealing section 41 first blocks a large amount of liquid, and then the second sealing section 42, with its better sealing performance, blocks the remaining liquid. However, the smaller gap between the second sealing section 42 and the inner knife rod 30 results in greater heat generation. Therefore, the axial length of the second sealing section 42 is made smaller than that of the first sealing section 41, allowing for flexible adjustment and control to prevent excessive heat generation during operation.

[0037] For example, the first spacing is, but not limited to, 0.02 mm to 0.05 mm, specifically, 0.02 mm, 0.03 mm, 0.04 mm, or 0.05 mm. Furthermore, the length of the first sealing section 41 in the axial direction is, but not limited to, 10 mm to 15 mm, specifically, 10 mm, 11 mm, 12 mm, 13 mm, or 15 mm. This configuration, with a smaller first spacing and a larger length of the first sealing section 41, provides better sealing performance, effectively preventing liquid from flowing axially into the support shank 10. Additionally, the relatively large first spacing and the shorter length of the first sealing section 41 prevent excessive heat generation during high-speed rotation of the inner tool holder 30.

[0038] For example, the second spacing may include, but is not limited to, ≤0.01mm, specifically, 0.002mm, 0.003mm, 0.004mm, 0.006mm, 0.007mm, 0.009mm, or 0.01mm. The length of the second sealing section 42 in the axial direction is 3mm to 6mm, specifically, 3mm, 4mm, 5mm, or 6mm. This configuration, where the second spacing is smaller than the first spacing, provides better sealing performance for the second sealing section 42; furthermore, the reduced length of the second sealing section 42 prevents excessive heat generation during high-speed rotation of the inner tool holder 30, thus avoiding impact on product performance.

[0039] Please see Figure 2 and Figure 3In one embodiment, a pressure relief hole 21 is formed on the outer blade tube 20, and the pressure relief hole 21 is located near the front end of the support handle 10. The interior of the outer blade tube 20 is connected to the exterior of the outer blade tube 20 through the pressure relief hole 21. Specifically, the pressure relief hole 21 is located on the front end side of the sealing sleeve 40. With this arrangement, on the one hand, when liquid flows into the rear end of the outer blade tube 20, most of the liquid is discharged to the exterior of the outer blade tube 20 through the pressure relief hole 21, and the remaining liquid is blocked by the sealing sleeve 40. In other words, the combination of blocking and discharge can effectively improve the sealing performance. On the other hand, the liquid between the outer blade tube 20 and the inner blade rod 30 is discharged to the outside in a timely manner through the pressure relief hole 21. In this way, the liquid heated by the inner blade rod 30 can be discharged in a timely manner through the pressure relief hole 21, while the low-temperature liquid can circulate into the area between the outer blade tube 20 and the inner blade rod 30, thereby allowing the heat generated by the high-speed operation of the inner blade rod 30 to dissipate quickly and extending its service life. In other words, the pressure relief hole 21 can prevent liquid from remaining in the area between the outer blade tube 20 and the inner blade rod 30 and being continuously heated to generate high-temperature liquid. The high-temperature liquid prevents the heat of the inner blade rod 30 and the outer blade tube 20 from being dissipated in time, resulting in deformation and damage to the non-metallic materials and a reduced lifespan.

[0040] In one embodiment, the outer wall of the sealing sleeve 40 is adapted to the inner wall of the outer knife tube 20 and is fixed by bonding or welding. In this way, the sealing sleeve 40 can be stably fixed inside the outer knife tube 20 and has good sealing performance.

[0041] For example, the sealing sleeve 40 may be, but is not limited to, a non-metallic sleeve, and may be made of polymer materials. With this configuration, the frictional heat generated between the inner tool holder 30 and the sealing sleeve 40 during high-speed rotation is reduced, resulting in lower noise.

[0042] Please see Figures 2 to 4 In one embodiment, the medical cutting tool further includes a first support sleeve 50. The first support sleeve 50 is disposed between the outer blade tube 20 and the inner blade shank 30. The first support sleeve 50 is a non-metallic sleeve and is located at the front end of the sealing sleeve 40. Thus, the first support sleeve 50 supports the inner blade shank 30, making its high-speed rotation more stable and reliable. Furthermore, the non-metallic design of the first support sleeve 50 prevents the inner blade shank 30 from contacting the outer blade tube 20 during high-speed rotation, thus preventing frictional heating and noise, thereby reducing noise and heat generation. Additionally, the first support sleeve 50, filling the space between the inner blade shank 30 and the outer blade tube 20, provides some liquid blocking, reducing the inflow of liquid into the support handle 10.

[0043] As an example, the pressure relief hole 21 is located between the first support sleeve 50 and the sealing sleeve 40. With this configuration, when the liquid flows through the first support sleeve 50 to the pressure relief hole 21, most of it is discharged outward through the pressure relief hole 21, while the remainder continues to flow into the gap between the sealing sleeve 40 and the inner knife bar 30, where it is blocked by the sealing sleeve 40 to prevent it from flowing into the interior of the support handle 10.

[0044] For example, the outer wall of the first support sleeve 50 fits and is fixedly connected to the inner wall of the outer blade tube 20. Specifically, the outer wall of the first support sleeve 50 and the inner wall of the outer blade tube 20 are connected together by means of, but not limited to, adhesive bonding or welding.

[0045] Optionally, the inner wall of the first support sleeve 50 and the outer wall of the inner tool bar 30 are provided with a third gap, which includes, but is not limited to, 0.05mm to 0.08mm, specifically, for example, 0.05mm, 0.06mm, 0.07mm or 0.08mm.

[0046] For example, the axial length of the first support sleeve 50 is set as 'a', and the axial length of the outer tool tube 20 is set as 'b', with 50% ≤ a / b ≤ 80%. Specifically, a / b is, for example, 50%, 60%, 65%, 70%, or 80%. With this setting, the axial length of the first support sleeve 50 is relatively large, which can improve the stability of the inner tool holder 30 when rotating at high speed.

[0047] For example, the shapes of the first support sleeve 50 and the outer cutter tube 20 can be independently set and adjusted according to actual needs, including but not limited to being arc-shaped. This configuration, where the shapes of the first support sleeve 50 and the outer cutter tube 20 are compatible, can improve the stability of the inner cutter bar 30 during high-speed rotation.

[0048] Please see Figure 2 , Figures 4 to 6 , Figure 7 and Figure 8 For example, the medical cutting tool also includes a connecting sleeve 60. The inner blade shank 30 includes a second connecting rod 31 and a cutting head 32, with the front end of the second connecting rod 31 connected to the cutting head 32. Specifically, the cutting head 32 includes a grinding section 321 and a first connecting rod 322. The front end of the first connecting rod 322 is connected to the grinding section 321, and both the first connecting rod 322 and the second connecting rod 31 pass through the connecting sleeve 60 and are connected by the connecting sleeve 60.

[0049] The grinding part 321 may include, but is not limited to, a round ball head or a cutting part, etc. The specific shape can be flexibly adjusted and set according to actual needs, and is not limited here.

[0050] For example, the medical cutting tool also includes a support tube 70. The support tube 70 is inserted into the front end of the outer cutting tube 20 and connected and fixed to the outer cutting tube 20. A connecting sleeve 60 passes through the interior of the support tube 70. Thus, the combined structure of the outer cutting tube 20 and the support tube 70 facilitates processing and assembly.

[0051] Based on the aforementioned embodiments, the medical cutting tool further includes a second support sleeve 80. The second support sleeve 80 is disposed between the support tube 70 and the connecting sleeve 60. The second support sleeve 80 is fixedly connected to the inner wall of the support tube 70, and the inner wall of the second support sleeve 80 and the outer wall of the connecting sleeve 60 are spaced apart to form a fourth gap. The fourth gap includes, but is not limited to, 0.05mm to 0.08mm, specifically, for example, 0.05mm, 0.06mm, 0.07mm, or 0.08mm. With this configuration, the second support sleeve 80 provides support for the connecting sleeve 60, making the high-speed rotation of the inner blade 30 more stable and reliable. Furthermore, the second support sleeve 80 is a non-metallic sleeve, which prevents the inner blade 30 from contacting the support tube 70 during high-speed rotation, thus preventing frictional heating and noise, thereby reducing noise and heat generation. Additionally, the second support sleeve 80, filling the space between the connecting sleeve 60 and the support tube 70, provides a certain degree of liquid blocking, effectively reducing the amount of liquid entering the medical cutting tool.

[0052] Please see Figure 4 , Figure 5 and Figure 8 For example, the medical cutting tool also includes a transition sleeve 90. The transition sleeve 90 is fitted over the front end of the second connecting rod 31 and fixedly connected to the second connecting rod 31. A connecting sleeve 60 is fitted over the transition sleeve 90 and the first connecting rod 322. The transition sleeve 90 is disposed between the second connecting rod 31 and the connecting sleeve 60. With this arrangement, the connecting sleeve 60 is not directly welded to the second connecting rod 31; instead, the connecting sleeve 60 is connected to the second connecting rod 31 through the transition sleeve 90, which can prevent breakage defects at the connection point when the second connecting rod 31 and the connecting sleeve 60 are directly welded.

[0053] For example, the inner wall of the transition sleeve 90 conforms to the shape of the outer wall of the second connecting rod 31 and is, for example, bonded together. With this configuration, the transition sleeve 90 is stably connected to the second connecting rod 31.

[0054] Furthermore, the front end of the connecting sleeve 60 is fixedly connected to the first connecting rod 322, specifically, for example, by welding. The welding position between the front end of the connecting sleeve 60 and the first connecting rod 322 is set as a first welding point 91, specifically, located at the junction of the first connecting rod 322 and the grinding part 321. With this arrangement, the first welding point 91 is close to the grinding part 321, allowing the heat generated during the welding process between the front end of the connecting sleeve 60 and the first connecting rod 322 to be dissipated quickly by the grinding part 321, thus preventing localized high temperatures at the weld. In addition, the cantilever length between the first welding point 91 and the grinding part 321 is very small, therefore, breakage is unlikely.

[0055] The rear end of the connecting sleeve 60 is fixedly connected to the transition sleeve 90, for example, by welding. The rear end of the connecting sleeve 60 and the rear end of the transition sleeve 90 are welded together, and the welding position is set as the second welding point 92. The second welding point 92 is located on the outer wall of the transition sleeve 90, rather than on the second connecting rod 31. This arrangement prevents breakage defects at the connection point when the second connecting rod 31 and the connecting sleeve 60 are directly welded. Specifically, the rear end of the transition sleeve 90 extends beyond the rear end of the connecting sleeve 60. In this way, the transition sleeve 90 and the connecting sleeve 60 form a step, which facilitates the welding connection between the rear end of the connecting sleeve 60 and the rear end of the transition sleeve 90.

[0056] In summary, during the assembly of medical cutting tools, welding and fixing are performed at the first welding point 91 and the second welding point 92, respectively, which reduces welding procedures, grinding and welding stress, and improves operational stability and service life.

[0057] Based on the aforementioned embodiment, the second connecting rod 31 is welded to the front end of the transition sleeve 90, for example. The welding position between the second connecting rod 31 and the transition sleeve 90 is set as a third welding point 93. The third welding point 93 is located inside the connecting sleeve 60. With this configuration, the third welding point 93 can eliminate the welding stress of the slender second connecting rod 31, prevent breakage, and improve service life.

[0058] Based on the aforementioned embodiment, the rear end of the transition sleeve 90 is not welded to the second connecting rod 31. Therefore, no weld point is formed between the rear end of the transition sleeve 90 and the second connecting rod 31, which can prevent fracture defects due to stress concentration when the rear end of the transition sleeve 90 is welded to the second connecting rod 31.

[0059] Based on the aforementioned embodiments, the connecting sleeve 60 is configured as a closed circular sleeve from one end to the other. In other words, no welds, grooves, openings, or through holes are formed on the sidewalls of the connecting sleeve 60. The connection positions of the connecting sleeve 60 and the inner tool shank 30 are specifically located at the first welding point 91 and the second welding point 92, respectively. With this configuration, the connecting sleeve 60 is a complete sleeve on all four sides, such as a complete circular sleeve, with a relatively flat outer surface, no weld scars, and less prone to wear, damage, and breakage defects.

[0060] In some embodiments, this application also provides a medical grinding apparatus, which includes the medical cutting tool of any of the above embodiments.

[0061] The aforementioned medical grinding device includes a sealing sleeve 40, which is positioned between the inner blade shank 30 and the outer blade tube 20. The distance between the outer wall of the inner blade shank 30 and the inner wall of the sealing sleeve 40 is ≤0.05mm, effectively blocking liquid flow and providing good sealing performance. This prevents liquid from flowing into the support handle 10 along the space between the inner blade shank 30 and the outer blade tube 20. Furthermore, with the sealing sleeve 40, the outer diameter of the inner blade shank 30 can be minimized, resulting in a relatively lower linear velocity during high-speed rotation. This reduces heat generation during dynamic sealing, thereby reducing wear and extending the device's lifespan.

[0062] Based on the aforementioned embodiments, the medical cutting tool further includes a bearing 94. The bearing 94 is disposed inside the support handle 10, and the inner cutting rod 30 is rotatably inserted within the bearing 94. A first connector 95 is connected to the rear end of the inner cutting rod 30. The medical grinding device also includes a handle. The handle is equipped with a power mechanism, such as a motor, and the power output shaft of the power mechanism is connected to a second connector. The first connector 95 is connected to the second connector. When the power mechanism is working, it drives the inner cutting rod 30 to rotate at high speed through the second connector and the first connector 95. With the support of the bearing 94, the rotational stability of the inner cutting rod 30 is relatively high.

[0063] It should be noted that the "grinding part 321" in this embodiment can be "a part of the first connecting rod 322", that is, the "grinding part 321" and "other parts of the first connecting rod 322" are integrally formed; or it can be an independent component that can be separated from "other parts of the first connecting rod 322", that is, the "grinding part 321" can be manufactured independently and then combined with "other parts of the first connecting rod 322" to form a whole.

[0064] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0065] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0066] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0067] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0068] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0069] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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, they should be considered to be within the scope of this specification.

[0070] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An inner knife bar, characterized in that, The inner cutter rod comprises: a cutter head comprising a grinding portion and a first connecting rod, the grinding portion being connected to the front end of the first connecting rod; a second connecting rod arranged at the rear end of the first connecting rod; a transition sleeve sleeved on the front end of the second connecting rod and fixedly connected with the second connecting rod; a connecting sleeve sleeved on the transition sleeve and the first connecting rod, the front end of the connecting sleeve being fixedly connected with the first connecting rod, and the rear end of the connecting sleeve being fixedly connected with the transition sleeve.

2. The inner knife bar of claim 1, wherein, The front end of the connecting sleeve is fixedly welded with the first connecting rod, the welding position of the front end of the connecting sleeve with the first connecting rod is a first welding point, and the first welding point is located at the connecting position of the first connecting rod and the grinding portion.

3. The inner knife bar of claim 1, wherein, The rear end of the transition sleeve extends to the outside of the rear end of the connecting sleeve; and / or the first connecting rod and the second connecting rod are in abutting cooperation along the axial direction.

4. The inner knife bar of claim 1, wherein, The front end of the second connecting rod is welded with the front end of the transition sleeve, and the connecting sleeve is arranged in a closed circular sleeve from one end to the other end.

5. The inner knife bar of claim 1, wherein, The inner wall of the transition sleeve is fixedly bonded with the outer wall of the second connecting rod; and / or the inner wall of the transition sleeve is adapted to the shape of the outer wall of the second connecting rod.

6. A medical cutting tool, characterized by The medical cutter comprises the inner cutter rod according to any one of claims 1 to 5, further comprises a support handle and an outer cutter tube, the rear end of the outer cutter tube being connected with the support handle; the inner cutter rod is rotatably arranged in the outer cutter tube and rotatably arranged in the inside of the support handle.

7. The medical cutting tool according to claim 6, characterized in that The medical cutter further comprises a support tube, the rear end of the support tube being sleeved on the front end of the outer cutter tube and fixedly connected with the outer cutter tube, the outer diameter of the support tube being smaller than the inner diameter of the outer cutter tube, and the connecting sleeve being sleeved on the support tube.

8. The medical cutting tool according to claim 6, wherein The medical cutter further comprises a sealing sleeve arranged in the inside of the outer cutter tube, the inner cutter rod being arranged in the sealing sleeve, and a gap being formed between the outer wall of the inner cutter rod and the inner wall of the sealing sleeve.

9. The medical cutting tool according to claim 6, wherein The outer cutter tube is provided with a pressure relief hole, the pressure relief hole being arranged close to the front end of the support handle, and the inside of the outer cutter tube being in communication with the outside through the pressure relief hole.

10. A medical grinding device, characterized by, The medical grinding device comprises the medical cutter according to any one of claims 6 to 9.

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