Medical cutter and medical grinding device

Abstract

The utility model relates to a medical cutter and a medical grinding device. The medical cutter comprises a supporting handle body, an outer cutter tube, an inner cutter bar and a sealing sleeve. The near end of the outer knife tube is connected with the supporting handle body. The inner cutter bar is rotatably arranged in the outer cutter tube in a penetrating mode and further rotatably arranged in the supporting handle body in a penetrating mode. The sealing sleeve is arranged in the outer cutter tube, the inner cutter bar penetrates through the sealing sleeve, and the outer wall of the inner cutter bar and the inner wall of the sealing sleeve are arranged at intervals. By means of the arrangement, the sealing sleeve plays a role in blocking liquid, has good sealing performance and can prevent the liquid from flowing into the supporting handle body along the interval space between the inner cutter bar and the outer cutter tube. Besides, under the condition that the sealing sleeve is arranged, the outer diameter of the inner cutter bar can be reduced as much as possible, the linear speed of the inner cutter bar during high-speed rotation is relatively reduced, and therefore heating during dynamic sealing can be reduced, abrasion is reduced, and the service life can be prolonged.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to 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, during the use of medical grinding devices, the grinding head is inserted into a surgical channel within the body, and saline solution is continuously injected into the surgical channel. The saline solution improves visibility and cools the cutting tools.

[0004] To minimize the heat generated by the contact between the inner and outer cutter tubes during high-speed grinding, a gap is required between them. However, physiological saline solution is pressurized and can easily flow axially through this gap to the bearing end at the cutter shank interface, causing corrosion and damage to the bearing and the micromotor at the rear end. Utility Model Content

[0005] Therefore, it is necessary to overcome the shortcomings of existing technologies and provide a medical cutting tool and medical grinding device that can improve waterproof performance.

[0006] A medical cutting tool, comprising:

[0007] Support handle;

[0008] An outer blade tube, the proximal end of which extends into the support handle body and is connected to the support handle body;

[0009] An inner cutter shank, which is fitted inside the outer cutter tube and rotatable relative to the outer cutter tube, wherein the proximal end of the inner cutter shank extends into the support shank body and passes through the proximal end of the outer cutter tube; and

[0010] A sealing sleeve is disposed between the inner wall of the outer blade tube and the outer wall of the inner blade rod, and there is a gap between the outer wall of the inner blade rod and the inner wall of the sealing sleeve.

[0011] In one embodiment, the sealing sleeve includes a first sealing section and a second sealing section arranged sequentially along the liquid flow direction; the gap between the outer wall of the inner knife rod and the inner wall of the first sealing section is a first spacing; the gap between the outer wall of the inner knife rod and the inner wall of the second sealing section is a second spacing; the first spacing is greater than the second spacing, and the length of the first sealing section in the axial direction is greater than the length of the second sealing section in the axial direction.

[0012] In one embodiment, the gap between the outer wall of the inner blade and the inner wall of the sealing sleeve is ≤0.05mm.

[0013] In one embodiment, the first spacing is 0.02 mm to 0.05 mm, and the length of the first sealing segment in the axial direction is 10 mm to 15 mm; the second spacing is ≤0.01 mm, and the length of the second sealing segment in the axial direction is 3 mm to 6 mm.

[0014] In one embodiment, a pressure relief hole is formed on the outer blade tube, and the interior of the outer blade tube communicates with the exterior of the outer blade tube through the pressure relief hole, which is located on the distal side of the sealing sleeve.

[0015] In one embodiment, the outer wall of the sealing sleeve is adapted to the inner wall of the outer knife tube and is bonded or welded to it.

[0016] In one embodiment, the medical cutting tool further includes a first support sleeve disposed between the outer blade tube and the inner blade rod. The first support sleeve is a non-metallic sleeve and is located on the distal side of the sealing sleeve.

[0017] In one embodiment, the outer wall of the first support sleeve fits and is fixedly connected to the inner wall of the outer blade tube; the inner wall of the first support sleeve and the outer wall of the inner blade are spaced apart by a third gap, the third gap being 0.05mm to 0.08mm.

[0018] In one embodiment, the axial length of the first support sleeve is set as 'a', and the axial length of the outer blade tube is set as 'b', where 50% ≤ a / b < 80%; and / or,

[0019] The first support sleeve is adapted to the shape of the outer blade tube, and both the first support sleeve and the outer blade tube are set to be arc-shaped.

[0020] A medical grinding device includes a power drive mechanism and a medical cutting tool, wherein the power drive mechanism is connected to the inner shank of the medical cutting tool.

[0021] The aforementioned medical cutting tools and grinding devices, by including a sealing sleeve positioned between the inner cutting rod and the outer cutting tube, serve to prevent liquid from flowing into the support shank through the space between the inner cutting rod and the outer cutting tube. Furthermore, the sealing sleeve allows for a reduction in the outer diameter of the inner cutting rod, resulting in a relatively lower linear velocity during high-speed rotation. This reduces heat generation during dynamic sealing, thereby minimizing wear and extending the lifespan of the device. Attached Figure Description

[0022] Figure 1 This is a structural diagram of a medical cutting tool according to an embodiment of this application.

[0023] Figure 2 for Figure 1 Sectional view of the structure at point AA.

[0024] Figure 3 for Figure 2 Enlarged structural diagram at point B.

[0025] Figure 4 for Figure 2 Enlarged structural diagram at point C.

[0026] Figure 5 for Figure 2 Enlarged structural diagram at point D.

[0027] Figure 6 for Figure 2 Enlarged structural diagram at point E.

[0028] 10. Support shank body; 20. Outer cutter tube; 21. Pressure relief hole; 30. Inner cutter bar; 31. First connecting rod; 32. Cutter head; 321. Grinding section; 322. Second 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 "proximal end" refers to the end of the instrument or component closer to the operator, and "distal end" refers to the end of the instrument or component farther from the operator; "axial" refers to the direction parallel to the line connecting the centers of the distal and proximal ends of the instrument or component, "radial" refers to the direction perpendicular to the axial direction, and "circumferential" 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 1 A 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 proximal end of the outer blade tube 20 extends into and is connected to the support handle 10. The inner blade shank 30 is fitted inside the outer blade tube 20 and is rotatable relative to the outer blade tube 20, with its proximal end extending into the support handle 10 and penetrating the proximal end of the outer blade tube 20. The sealing sleeve 40 is disposed between the inner wall of the outer blade tube 20 and the outer wall of the inner blade shank 30, specifically, for example, located at the proximal end of the outer blade tube 20. A gap exists between the outer wall of the inner blade shank 30 and the inner wall of the sealing sleeve 40.

[0032] The aforementioned medical cutting tool, including a sealing sleeve 40 positioned between the inner blade shank 30 and the outer blade tube 20, serves to prevent liquid from entering the support handle 10. This provides excellent sealing performance and prevents liquid from flowing into the support handle 10 through the space between the inner blade shank 30 and the outer blade tube 20. Furthermore, 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] Optionally, the distance between the outer wall of the inner blade 30 and the inner wall of the sealing sleeve 40 is ≤0.05mm. This serves to block liquid and provides good sealing performance, preventing liquid from flowing into the support handle 10 along the space between the inner blade 30 and the outer blade tube 20.

[0034] 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.

[0035] Please see Figure 2 and Figure 3In 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 gap between the outer wall of the inner blade 30 and the inner wall of the first sealing section 41 is a first gap. The gap between the outer wall of the inner blade 30 and the inner wall of the second sealing section 42 is a second gap. The first gap is greater than the second gap, and the length of the first sealing section 41 in the axial direction is greater than the length of the second sealing section 42 in the axial direction.

[0036] It should be noted that the direction of liquid flow refers to the direction from the distal end to the proximal end of the inner tool holder 30.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Please see Figure 2 and Figure 3 In one embodiment, a pressure relief hole 21 is formed on the outer blade tube 20, and 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. The pressure relief hole 21 is located on the distal side of the sealing sleeve 40. With this configuration, on the one hand, when liquid flows into the proximal 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.

[0041] 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.

[0042] 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.

[0043] 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 distal 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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', where 50% ≤ a / b ≤ 80%. Specifically, a / b can be, 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 it rotates at high speed.

[0048] 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.

[0049] Please see Figure 2 , Figures 4 to 6 For example, the medical cutting tool also includes a connecting sleeve 60. The inner blade shank 30 includes a first connecting rod 31 and a cutting head 32, the distal end of the first connecting rod 31 being connected to the cutting head 32. Specifically, the cutting head 32 includes a grinding section 321 and a second connecting rod 322. The distal end of the second connecting rod 322 is connected to the grinding section 321, and both the second connecting rod 322 and the first connecting rod 31 pass through the connecting sleeve 60 and are connected by the connecting sleeve 60.

[0050] 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.

[0051] For example, the medical instrument also includes a support tube 70. The support tube 70 is inserted into the distal end of the outer blade tube 20 and is connected and fixed to the outer blade tube 20. A connecting sleeve 60 passes through the interior of the support tube 70.

[0052] 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.

[0053] For example, the medical cutting tool also includes a transition sleeve 90. The transition sleeve 90 is disposed between the first connecting rod 31 and the connecting sleeve 60. With this arrangement, the connecting sleeve 60 is not directly welded to the first connecting rod 31. Instead, the connecting sleeve 60 is connected to the first connecting rod 31 through the transition sleeve 90, which can prevent breakage defects at the connection point when the first connecting rod 31 and the connecting sleeve 60 are directly welded.

[0054] For example, the inner wall of the transition sleeve 90 conforms to the shape of the outer wall of the first connecting rod 31 and is, for example, bonded together. With this configuration, the transition sleeve 90 is stably connected to the first connecting rod 31.

[0055] Furthermore, the distal end of the connecting sleeve 60 is welded to the second connecting rod 322. The welding position between the distal end of the connecting sleeve 60 and the second connecting rod 322 is set as a first welding point 91, specifically located, for example, at the junction of the second connecting rod 322 and the grinding part 321. With this arrangement, the first welding point 91 is close to the grinding part 321, allowing heat generated during the welding process between the distal end of the connecting sleeve 60 and the second connecting rod 322 to be dissipated quickly to the grinding part 321, thus preventing localized high temperatures at the weld joint. In addition, the cantilever length between the first welding point 91 and the grinding part 321 is very small, thus preventing breakage.

[0056] The proximal end of the connecting sleeve 60 is welded to the proximal end of the transition sleeve 90, for example. The welding position between the proximal ends of the connecting sleeve 60 and the transition sleeve 90 is set as a second welding point 92. The second welding point 92 is located on the outer wall of the transition sleeve 90, rather than on the first connecting rod 31. This arrangement prevents breakage defects at the connection point when the first connecting rod 31 and the connecting sleeve 60 are directly welded. Specifically, the proximal end of the transition sleeve 90 extends beyond the proximal end of the connecting sleeve 60. Thus, the transition sleeve 90 and the connecting sleeve 60 form a step, facilitating the welding connection between the proximal ends of the connecting sleeve 60 and the transition sleeve 90.

[0057] 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.

[0058] Based on the aforementioned embodiment, the first connecting rod 31 is welded to the distal end of the transition sleeve 90, for example. The welding position between the first 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 first connecting rod 31, prevent breakage, and improve service life.

[0059] Based on the aforementioned embodiments, the proximal end of the transition sleeve 90 is not welded to the first connecting rod 31. Therefore, no weld point is formed between the proximal end of the transition sleeve 90 and the first connecting rod 31, which can prevent fracture defects due to stress concentration when the proximal end of the transition sleeve 90 is welded to the first connecting rod 31.

[0060] 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.

[0061] In some embodiments, this application also provides a medical grinding apparatus, which includes a power drive mechanism and a medical cutting tool from any of the above embodiments. The power drive mechanism is connected to the inner shank of the medical cutting tool via a transmission connection.

[0062] 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. This sealing sleeve acts as a liquid barrier, providing good sealing performance and preventing liquid from flowing into the support shank 10 through 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 device's lifespan.

[0063] 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 through the bearing 94. A first connector 95 is connected to the proximal 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.

[0064] It should be noted that the "grinding part 321" in this embodiment can be a part of the "second connecting rod 322", that is, the "grinding part 321" and the "other parts of the second connecting rod 322" are integrally formed; or it can be an independent component that can be separated from the "other parts of the second connecting rod 322", that is, the "grinding part 321" can be manufactured independently and then combined with the "other parts of the second connecting rod 322" to form a whole.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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. A medical cutting tool, characterized by The medical cutter comprises: a support handle; an outer cutter tube, a proximal end of the outer cutter tube extending into the support handle and being connected with the support handle; an inner cutter rod, the inner cutter rod being sleeved in the outer cutter tube and being rotatable relative to the outer cutter tube, a proximal end of the inner cutter rod extending into the support handle and penetrating the proximal end of the outer cutter tube; and a sealing sleeve, the sealing sleeve being arranged between an inner wall of the outer cutter tube and an outer wall of the inner cutter rod, and a gap being formed between the outer wall of the inner cutter rod and an inner wall of the sealing sleeve.

2. The medical cutting tool according to claim 1, characterized in that The sealing sleeve comprises a first sealing section and a second sealing section arranged in sequence along a liquid flow direction; a gap between the outer wall of the inner cutter rod and an inner wall of the first sealing section is a first gap; a gap between the outer wall of the inner cutter rod and an inner wall of the second sealing section is a second gap; the first gap is greater than the second gap, and a length of the first sealing section along an axial direction is greater than a length of the second sealing section along the axial direction.

3. The medical cutting tool according to claim 2, characterized in that The gap between the outer wall of the inner cutter rod and the inner wall of the sealing sleeve is ≤0.05 mm.

4. The medical cutting tool according to claim 3, characterized in that The first gap is 0.02 mm to 0.05 mm, and the length of the first sealing section along the axial direction is 10 mm to 15 mm; the second gap is ≤0.01 mm, and the length of the second sealing section along the axial direction is 3 mm to 6 mm.

5. The medical cutting tool according to claim 1, wherein A pressure relief hole is formed on the outer cutter tube, an inside of the outer cutter tube is in communication with an outside of the outer cutter tube through the pressure relief hole, and the pressure relief hole is located on a distal end side of the sealing sleeve.

6. The medical cutting tool according to claim 1, wherein An outer wall of the sealing sleeve is adapted to an inner wall of the outer cutter tube and is fixedly connected by bonding or welding.

7. The medical cutting tool according to Claim 1, wherein The medical cutter further comprises a first support sleeve, the first support sleeve being arranged between the outer cutter tube and the inner cutter rod, the first support sleeve being arranged as a non-metal sleeve, and the first support sleeve being located on the distal end side of the sealing sleeve.

8. The medical cutting tool according to claim 7, characterized in that An outer wall of the first support sleeve is adapted to an inner wall of the outer cutter tube and is fixedly connected; an inner wall of the first support sleeve is spaced apart from the outer wall of the inner cutter rod to form a third gap, and the third gap is 0.05 mm to 0.08 mm.

9. The medical cutting tool according to claim 7, wherein An axial length of the first support sleeve is a, an axial length of the outer cutter tube is b, and 50%≤a / b<80%; and / or The first support sleeve and the outer cutter tube are adapted to each other in shape, and the first support sleeve and the outer cutter tube are both arranged as an arc shape.

10. A medical grinding device, characterized by, The medical grinding device comprises a power driving mechanism and the medical cutter according to any one of claims 1 to 9, the power driving mechanism being in transmission connection with the inner cutter rod of the medical cutter.

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