Medical grinding device

Abstract

The utility model relates to a medical grinding device which comprises a handle and a medical cutter. The handle comprises a body, a power mechanism and a handle connector, the power mechanism is arranged in the body, and the handle connector is arranged at the far end of the body. The medical cutter comprises a supporting handle body, an outer cutter tube, an inner cutter bar and an inner handle body. The handle connector can extend into the supporting handle body and is detachably connected with the supporting handle body, the near end of the inner handle body extends into the handle connector, the outer wall of the near end of the inner handle body abuts against the inner wall of the handle connector, the inner handle body is arranged in the supporting handle body and abuts against the supporting handle body, and the cutter bar assembly penetrates through the inner handle body and is in transmission connection with the power mechanism. Due to the fact that the inner handle body plays a role in supporting the handle connector, under the supporting effect of the inner handle body, the connecting position of the handle connector and the supporting handle body is stable and reliable, and therefore the rotation stability of the inner cutter bar in the high-speed operation process can be improved.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to 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] Medical grinding devices in related technologies typically include a handle and a medical cutting tool, with the connection between them usually achieved through a plug-in quick-connect snap-fit. Specifically, the handle has a handle interface, and the medical cutting tool has a support shank. The handle connects to the support shank via the handle interface. Furthermore, the handle has an output shaft, and the medical cutting tool includes a bearing and an inner cutting rod. The bearing is located inside the support shank, and the inner cutting rod rotatably passes through the bearing. The inner cutting rod is connected to the output shaft, which drives the inner cutting rod to rotate.

[0004] To improve the stability of medical cutting tools, the handle interface is typically designed to be relatively long in the axial direction. However, during high-speed operation, stress concentration easily occurs at the connection between the output shaft and the inner cutting tool, resulting in lower operational stability of the inner cutting tool; moreover, a large amount of heat is generated when the handle interface comes into contact with the inner cutting tool. Utility Model Content

[0005] Therefore, it is necessary to overcome the shortcomings of the existing technology and provide a medical grinding device that can improve the rotational stability of the inner tool holder during high-speed operation.

[0006] A medical grinding device, comprising:

[0007] A handle, comprising a main body, a power mechanism, and a handle interface, wherein the power mechanism is disposed inside the main body, and the handle interface is fixedly connected to the distal end face of the main body; and

[0008] A medical cutting tool includes a support handle, a blade assembly, and an inner handle. The handle interface extends into the support handle and is detachably connected to it. The proximal end of the inner handle extends into the handle interface, and the outer wall of the proximal end of the inner handle abuts against the inner wall of the handle interface. The inner handle is located inside the support handle and abuts against it. The blade assembly passes through the inner handle and is connected to the power mechanism.

[0009] In one embodiment, the support handle has a first through hole extending along its axial direction, the inner handle has a second through hole extending along its axial direction, and the handle interface is inserted into the first through hole and connected to the support handle.

[0010] The tool holder assembly includes an outer tool tube and an inner tool holder. The proximal end of the outer tool tube extends into the second through hole and is fixedly connected to the inner shank body. The inner tool holder is rotatably inserted through the outer tool tube and the second through hole. The proximal end of the inner tool holder is connected to the power mechanism for transmission.

[0011] In one embodiment, the medical cutting tool further includes a bearing disposed within the second through hole, and the inner cutting rod passes through the bearing; the inner wall of the second through hole is provided with a mounting position for mounting the bearing.

[0012] In one embodiment, the medical cutting tool further includes a first sealing ring; the first sealing ring is disposed between the outer wall of the inner handle body and the inner wall of the handle interface.

[0013] In one embodiment, the inner handle includes a connecting segment and a support segment arranged sequentially from the distal end to the proximal end along the axial direction and connected to each other; the support segment extends into the handle interface and abuts against the inner wall of the handle interface, and the connecting segment abuts against the distal end face of the support handle.

[0014] In one embodiment, the tool holder assembly includes an outer tool tube and an inner tool holder, the inner tool holder being rotatably inserted into the outer tool tube, and the proximal end of the outer tool tube being inserted into the interior of the connecting section and connected to the connecting section.

[0015] In one embodiment, the power mechanism is provided with a first docking joint, and the proximal end of the tool holder assembly is provided with a second docking joint. The first docking joint and the second docking joint are plugged into each other, and the first docking joint can drive the second docking joint to rotate synchronously when it rotates.

[0016] In one embodiment, the medical cutting tool further includes a second sealing ring; the second sealing ring is disposed between the outer wall of the handle interface and the inner wall of the support handle.

[0017] In one embodiment, the medical cutting tool further includes a third sealing ring; the third sealing ring is disposed between the proximal end face of the support handle and the distal end face of the main body, and the proximal end face of the support handle and the distal end face of the main body abut against each other.

[0018] In one embodiment, the outer wall of the handle interface is provided with a first thread, and the inner wall of the support handle is provided with a second thread adapted to the first thread. The handle interface and the support handle are detachably connected through the first thread and the second thread.

[0019] In the aforementioned medical grinding device, the power mechanism drives the inner blade holder to rotate during use, thereby achieving the grinding action. Since the handle interface is inserted into the first through hole and connected to the support handle body, and the distal end of the inner handle body is connected to the support handle body, the inner handle body passes through the handle interface and abuts against the inner wall of the handle interface. Thus, the inner handle body provides support for the handle interface, ensuring a stable and reliable connection between the handle interface and the support handle body, thereby improving the rotational stability of the inner blade holder. Attached Figure Description

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

[0021] Figure 2 for Figure 1 The exploded view of the medical grinding device shown.

[0022] Figure 3 for Figure 1 The diagram shows the internal structure of a medical grinding device.

[0023] Figure 4 for Figure 3 Enlarged structural diagram at point A.

[0024] Figure 5 for Figure 4 The diagram shows the disassembled structure of the handle and the medical instrument.

[0025] 10. Handle; 11. Main body; 12. Power mechanism; 121. First docking joint; 13. Handle interface; 131. First thread; 20. Medical knife; 21. Support handle body; 211. Second thread; 212. First protrusion; 213. Second protrusion; 214. Second groove; 215. Clearance area; 216. Mounting slot; 2161. Groove; 217. Third groove; 22. Outer knife tube; 23. Inner knife rod; 231. Second docking joint; 24. Inner handle body; 241. Support section; 242. Connecting section; 243. First groove; 25. Bearing; 26. First sealing ring; 27. Second sealing ring; 28. Anti-slip sleeve. Detailed Implementation

[0026] 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.

[0027] As described in the background section, in existing technologies, stress concentration easily occurs at the connection between the output shaft and the inner tool holder during high-speed operation, resulting in low operational stability and excessive heat generation. The inventors have discovered that this problem arises because the axial distance between the connection between the output shaft and the inner tool holder and the bearing increases with the length of the handle interface. When this axial distance is large, the stability of the inner tool holder during high-speed operation is reduced. When the operational stability of the inner tool holder is low, it is prone to contact with the handle interface during operation, leading to heat generation.

[0028] For the reasons mentioned above, this application provides a medical grinding device that can improve the installation stability of medical cutting tools.

[0029] 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... Figures 1 to 5 The direction indicated by Z in any given image.

[0030] See Figure 1 and Figure 2 , Figure 1 A structural diagram of a medical grinding apparatus according to an embodiment of this application is shown. Figure 2 It shows Figure 1 The diagram shows an exploded view of the medical grinding device. One embodiment of this application provides a medical grinding device including a handle 10 and a medical cutting tool 20.

[0031] Please see Figures 3 to 5 , Figure 3 It shows Figure 1 The diagram shows the internal structure of a medical grinding device. Figure 4 It shows Figure 3 Enlarged structural diagram at point A. Figure 5 It shows Figure 4The diagram shows an exploded view of the handle 10 and the medical instrument 20. The handle 10 includes a main body 11, a power mechanism 12, and a handle interface 13. The power mechanism 12 is located inside the main body 11, and the handle interface 13 is fixedly connected to the distal end face of the main body 11. Specifically, the handle interface 13 is connected to the distal end face of the main body 11 and extends along the axial direction.

[0032] In addition, the medical cutting tool 20 includes a support handle 21, a blade assembly, and an inner handle 24. The handle interface 13 can extend into the support handle 21 and is detachably connected to the support handle 21. The proximal end of the inner handle 24 extends into the handle interface 13, and the outer wall of the proximal end of the inner handle 24 abuts against the inner wall of the handle interface 13. The inner handle 24 is located inside the support handle 21 and abuts against the end face of the support handle 21. The blade assembly passes through the inner handle 24 and is connected to the power mechanism 12 for transmission.

[0033] Specifically, the support handle 21 has a first through hole extending along its axis, and the inner handle 24 has a second through hole extending along its axis. The handle interface 13 is inserted into the first through hole and connected to the support handle 21. The tool holder assembly includes an outer tool tube 22 and an inner tool holder 23. The proximal end of the outer tool tube 22 extends into the second through hole and is fixedly connected to the inner handle. The inner tool holder 23 is rotatably inserted into the outer tool tube 22 and the second through hole, and the proximal end of the inner tool holder 23 is connected to the power mechanism 12. The inner handle 24 is disposed inside the first through hole, and the distal end of the inner handle 24 is connected to the support handle 21. The inner handle 24 passes through the handle interface 13 and abuts against the inner wall of the handle interface 13.

[0034] In the aforementioned medical grinding device, the power mechanism 12 drives the inner blade shank 23 to rotate during use, thereby achieving the grinding action. Since the handle interface 13 is inserted into the first through hole and connected to the support handle 21, and the distal end of the inner handle 24 is connected to the support handle 21, the inner handle 24 passes through the handle interface 13 and abuts against the inner wall of the handle interface 13. Thus, the inner handle 24 provides support for the handle interface 13. Under the support of the inner handle 24, the connection between the handle interface 13 and the support handle 21 is stable and reliable, thereby improving the rotational stability of the inner blade shank 23 during high-speed operation.

[0035] Please see Figures 3 to 5In one embodiment, the medical cutting tool 20 further includes a bearing 25. The bearing 25 is disposed within a second through hole, and the inner cutting tool 23 passes through the bearing 25. The inner wall of the second through hole has a mounting position for mounting the bearing 25. The portion of the inner shank 24 for mounting the bearing 25 is located inside the handle interface 13. Thus, the bearing 25 supports the inner cutting tool 23, improving the rotational stability of the inner cutting tool 23. Moreover, since the portion of the inner shank 24 for mounting the bearing 25 is located inside the handle interface 13, in other words, the bearing 25 is located not only inside the inner shank 24 but also inside the handle interface 13. This arrangement of the bearing 25 is closer to the connection position between the inner cutting tool 23 and the power mechanism 12 compared to related technologies, improving the performance of the structure during high-speed operation, reducing noise and vibration, and enhancing operational stability.

[0036] It should be noted that the installation position of the bearing 25 inside the second through hole of the inner shank 24 can be flexibly adjusted and set along the axial direction according to actual needs, as long as it is installed in the shank structure that extends into the handle interface 13. In this embodiment, in order to make the bearing 25 closer to the connection between the inner tool holder 23 and the power mechanism 12, the bearing 25 is specifically set at the proximal end of the inner shank 24. With this setting, the bearing 25 is as close as possible to the connection between the inner tool holder 23 and the power mechanism 12, making the high-speed operation performance of the inner tool holder 23 more stable and reliable, and reducing noise and vibration.

[0037] In one embodiment, the medical cutting tool 20 further includes a first sealing ring 26. The first sealing ring 26 is disposed between the outer wall of the inner shank 24 and the inner wall of the handle interface 13. Optionally, the number of first sealing rings 26 may include, but is not limited to, one, two, three, or any other arbitrary number, which can be flexibly adjusted and set according to actual needs. In this way, the first sealing ring 26 can improve the sealing effect between the outer wall of the inner shank 24 and the inner wall of the handle interface 13, thereby reducing the noise generated by the power mechanism 12 during operation, reducing vibration, and eliminating radial movement, so that the handle interface 13 and the supporting shank 21 form a stable and reliable fit, which can further increase the rotational speed of the inner blade shank 23; at the same time, it forms damping during insertion and removal, which improves the feel of the assembly operation.

[0038] Optionally, the first sealing ring 26 may be, but is not limited to, an elastic ring, thereby providing better vibration damping.

[0039] Optionally, the first sealing ring 26 may include, but is not limited to, a structure with an axial cross-section of a circle, ellipse, polygon, or other regular or irregular shapes. The specific shape can be flexibly adjusted and set according to actual needs, and is not limited here.

[0040] Based on the aforementioned embodiments, a first groove 243 is formed on the outer wall of the inner handle body 24 or the inner wall of the handle interface 13, and a first sealing ring 26 is installed inside the first groove 243.

[0041] In one embodiment, the inner handle 24 includes a support section 241 and a connecting section 242 arranged axially and connected to each other. The support section 241 extends into the handle interface 13 and abuts against the inner wall of the handle interface 13, while the connecting section 242 is located outside the handle interface 13 and connected to the support handle 21.

[0042] Specifically, the outer diameter of the connecting section 242 is larger than the outer diameter of the support section 241. The outer wall shape of the connecting section 242 matches the inner wall shape of the support handle 21, so that the connecting section 242 and the support handle 21 can be stably connected together. In addition, the outer wall shape of the support section 241 matches the inner wall shape of the handle interface 13, so that the support section 241 and the handle interface 13 can be stably abutted together.

[0043] In one embodiment, the proximal end of the outer blade tube 22 passes through the interior of the connecting section 242 and is connected to the connecting section 242. With this arrangement, the outer blade tube 22, the inner shank body 24, and the supporting shank body 21 are connected to each other, forming an overall structure with high stability.

[0044] Based on the aforementioned embodiment, the connecting segment 242 is formed with an annular step that matches the shape of its proximal end. The proximal end of the connecting segment 242 is connected and fixed to the annular step.

[0045] In one embodiment, the power mechanism 12 is provided with a first docking joint 121, and the proximal end of the inner blade 23 is provided with a second docking joint 231. The first docking joint 121 and the second docking joint 231 are connected by insertion, and the first docking joint 121 can drive the second docking joint 231 to rotate synchronously when it rotates.

[0046] For example, the power mechanism 12 is provided with a first mating joint 121, and the proximal end of the inner tool holder 23 is provided with a second mating joint 231. The first mating joint 121 and the second mating joint 231 are connected by insertion, for example. When the first mating joint 121 and the second mating joint 231 are connected to each other, the power mechanism 12 drives the first mating joint 121 to rotate, and the first mating joint 121 transmits power to the second mating joint 231. The second mating joint 231 correspondingly drives the inner tool holder 23 to rotate, thereby realizing the grinding or cutting action.

[0047] Optionally, the power mechanism 12 may include, but is not limited to, a micro motor. Specifically, the micro motor is connected to the host computer via a cable, transmitting signals between them. The power shaft of the micro motor is connected to the inner tool holder 23. Under the control of the host computer, the tool holder is driven to rotate, thereby achieving operations such as grinding and cutting.

[0048] In one embodiment, the medical cutting tool 20 further includes a second sealing ring 27. The second sealing ring 27 is disposed between the outer wall of the handle interface 13 and the inner wall of the first through hole. Thus, the second sealing ring 27 can achieve a good sealing effect between the handle interface 13 and the support handle body 21, thereby reducing the noise generated by the power mechanism 12 inside the handle 10 during operation, reducing vibration, and eliminating radial movement, so that the handle interface 13 and the support handle body 21 form a stable and reliable fit. At the same time, it provides damping during insertion and removal, thereby improving the feel of the assembly operation.

[0049] Optionally, the second sealing ring 27 is an elastic ring, which can play a better role in vibration reduction.

[0050] Optionally, the second sealing ring 27 may include, but is not limited to, a structure with an axial cross-section of a circle, ellipse, polygon, or other regular or irregular shapes. The specific shape can be flexibly adjusted and set according to actual needs, and is not limited here.

[0051] Specifically, a second groove 214 is formed on the inner wall of the first through hole. The second sealing ring 27 is installed in the second groove 214.

[0052] In one embodiment, the medical cutting tool 20 further includes a third sealing ring (not shown in the figure). The third sealing ring is disposed between the proximal end face of the support handle 21 and the distal end face of the body 11, with the proximal end face of the support handle 21 abutting against the distal end face of the body 11. Thus, the third sealing ring provides a sealing function, effectively reducing noise and, due to its elasticity, absorbing vibration, thereby preventing loosening between the handle 10 and the medical cutting tool 20.

[0053] Optionally, the specific shape of the third sealing ring is similar to that of the second sealing ring 27, including but not limited to a structure with an axial cross-section of a circle, ellipse, polygon, or other regular or irregular shapes. The specific shape can be flexibly adjusted and set according to actual needs, and is not limited here.

[0054] Based on the aforementioned embodiment, a third groove 217 is formed on the proximal end face of the support handle 21, and a third sealing ring is installed inside the third groove 217.

[0055] For example, the outer wall of the handle interface 13 is provided with a first thread 131. Optionally, the first thread 131 may be provided at the distal end of the handle interface 13, or it may be provided at any part or all of the distal to proximal end of the handle interface 13 according to actual needs. In addition, the inner wall of the first through hole is provided with a second thread 211 adapted to the first thread 131. With this configuration, the handle 10 and the medical instrument 20 are engaged by the first thread 131 on the outer wall of the handle interface 13 and the second thread 211 on the inner wall of the first through hole of the support handle 21, so that the handle interface 13 and the support handle 21 are connected together by threads. In this way, there is no room for movement between the support handle 21 and the handle interface 13 in either the circumferential or radial direction, which can effectively prevent movement in the circumferential and radial directions, resulting in high installation stability and ensuring the smooth operation of the medical instrument 20 at high speeds. Therefore, it is suitable for surgeries with high requirements for grinding or cutting accuracy.

[0056] When it is necessary to separate the handle 10 from the medical knife 20, it can be done by rotating the handle 10 and the medical knife 20 relative to each other. The disassembly and assembly operation is simple and easy to implement.

[0057] In one embodiment, the first thread 131 extends counterclockwise from the distal end to the proximal end of the handle interface 13. Thus, when the medical tool 20 is rotated clockwise, it locks with the handle 10; when rotated counterclockwise, it separates from the handle 10. Therefore, during operation of the medical grinding device, medical personnel typically rotate the medical tool 20 clockwise for various surgical procedures. Based on the rotation direction of the first thread 131, the medical tool 20 locks with the handle 10, preventing loosening and effectively preventing circumferential and radial movement. This ensures high installation stability and smooth high-speed operation of the medical tool 20, making it suitable for surgeries requiring high grinding or cutting precision.

[0058] Of course, as some alternatives, the first thread 131 may also be provided to extend in a clockwise direction from the distal end to the proximal end of the handle interface 13.

[0059] It should be noted that the first thread 131 can be arranged at any part or in all areas of the handle interface 13 from the proximal end to the distal end. The specific arrangement can be flexibly adjusted and set according to actual needs, and is not limited here. Similarly, the second sealing ring 27 can also be arranged at any part of the handle interface 13 from the proximal end to the distal end, as long as it can achieve a sealing fit between the outer wall of the handle interface 13 and the inner wall of the first through hole. The specific setting position is not limited here.

[0060] In one specific embodiment, the second sealing ring 27 is disposed at the proximal end of the support handle 21, and the second thread 211 and the second sealing ring 27 are arranged sequentially at intervals along the axial direction of the support handle 21. The first thread 131 is disposed at the distal end of the handle interface 13. Thus, the second sealing ring 27 is positioned close to the junction of the support handle 21 and the handle 10, and thus close to the connection position between the power mechanism 12 of the handle 10 and the inner blade shank 23 of the medical knife 20, thereby providing a better buffering effect and vibration reduction.

[0061] In one embodiment, a first protrusion 212 is wound around the inner wall of the first through hole, and a second thread 211 is formed on the first protrusion 212. A second protrusion 213 is wound around the inner wall of the first through hole, and a second groove 214 is wound around the second protrusion 213. A clearance area 215 is formed in the region between the first protrusion 212 and the second protrusion 213 on the inner wall of the first through hole. The clearance area 215 can prevent over-positioning. The air in the cavity formed is a poor conductor of heat, which can help to isolate the heat generated by the high-speed rotating bearing 25 and reduce the heat generation of the handle 10. In addition, the thin-walled structure formed by the clearance area 215 can help the tool absorb vibration during high-speed rotation and ensure the effect of the sealing ring at the rear end of the cavity. Furthermore, it can also reduce the material, thereby reducing weight and saving costs.

[0062] It should be noted that in this embodiment, the "first protrusion 212 and the second protrusion 213" can be a part of the "support handle 21", that is, the "first protrusion 212 and the second protrusion 213" are integrally formed with the "other parts of the support handle 21"; or they can be an independent component that can be separated from the "other parts of the support handle 21", that is, the "first protrusion 212 and the second protrusion 213" can be manufactured independently and then combined with the "other parts of the support handle 21" to form a whole.

[0063] In one embodiment, the medical knife 20 further includes an anti-slip sleeve 28. The anti-slip sleeve 28 is fitted over the outside of the support handle 21. Thus, the anti-slip sleeve 28 provides an anti-slip function, improving ease of operation.

[0064] In one embodiment, the support handle 21 is provided with a mounting groove 216 extending around its circumference, and the anti-slip sleeve 28 is installed inside the mounting groove 216. In this way, the mounting groove 216 limits the anti-slip sleeve 28 along its axial direction, effectively preventing the anti-slip sleeve 28 from moving along the axial direction of the support handle 21, so that the anti-slip sleeve 28 is stably installed on the support handle 21.

[0065] Specifically, the outer wall surface of the anti-slip sleeve 28 is flush with the outer wall surface of the support handle 21.

[0066] Optionally, the anti-slip sleeve 28 may include, but is not limited to, a sleeve made of silicone or other rubber materials. This improves the grip feel, helps absorb vibrations, and effectively prevents the handle 10 from overheating.

[0067] Optionally, the outer wall of the anti-slip sleeve 28 may be provided with anti-slip textures of various patterns and / or multiple anti-slip protrusions, so that the anti-slip sleeve 28 can play an anti-slip role.

[0068] In one embodiment, a spiral groove 2161 is formed on the bottom wall of the mounting groove 216. Thus, when the spiral groove 2161 contacts the inner wall of the anti-slip sleeve 28, it can effectively prevent the anti-slip sleeve 28 from rotating relative to the support handle 21, thereby improving the stability of the anti-slip sleeve 28 on the support handle 21.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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 grinding device, characterized by, The utility model provides a medical knife tool and a hand handle thereof, and the medical knife tool comprises a support handle body, a knife rod assembly and an inner handle body. The hand handle comprises a main body, a power mechanism arranged inside the main body and a handle interface fixedly connected to the distal end surface of the main body. The handle interface can be inserted into the support handle body and detachably connected to the support handle body. The proximal end of the inner handle body is inserted into the handle interface and abuts against the inner wall of the handle interface.

2. The medical grinding device according to claim 1, characterized in that The inner handle body is arranged inside the support handle body and abuts against the support handle body. The knife rod assembly is arranged in the inner handle body and drivingly connected to the power mechanism.

3. The medical grinding device according to claim 2, characterized in that The support handle body has a first through hole extending along the axial direction thereof.

4. The medical grinding device according to claim 3, characterized in that The inner handle body has a second through hole extending along the axial direction thereof.

5. The medical grinding device according to claim 1, characterized in that, The handle interface is inserted into the first through hole and connected to the support handle body.

6. The medical grinding device according to claim 5, characterized in that The knife rod assembly comprises an outer knife tube and an inner knife rod.

7. The medical grinding device according to claim 1, characterized in that The proximal end of the outer knife tube is inserted into the second through hole and fixedly connected to the inner handle body.

8. The medical grinding device according to claim 1, characterized in that The inner knife rod is rotatably arranged in the outer knife tube and the second through hole.

9. The medical grinding device according to claim 1, characterized in that, The proximal end of the inner knife rod is drivingly connected to the power mechanism.

10. The medical grinding device according to any one of claims 1 to 9, characterized in that The medical knife tool further comprises a bearing arranged in the second through hole. The inner knife rod is arranged in the bearing. The inner wall of the second through hole is provided with a mounting position for mounting the bearing. The medical knife tool further comprises a first sealing ring arranged between the outer wall of the inner handle body and the inner wall of the handle interface. The inner handle body comprises a connecting section and a supporting section arranged in sequence along the axial direction and connected to each other. The supporting section is inserted into the handle interface and abuts against the inner wall of the handle interface. The connecting section abuts against the distal end surface of the support handle body. The knife rod assembly comprises an outer knife tube and an inner knife rod. The inner knife rod is rotatably arranged in the outer knife tube. The proximal end of the outer knife tube is arranged in the connecting section and connected to the connecting section. The power mechanism is provided with a first docking joint. The proximal end of the knife rod assembly is provided with a second docking joint. The first docking joint is insertedly connected to the second docking joint. When the first docking joint rotates, the second docking joint can be synchronously rotated. The medical knife tool further comprises a second sealing ring arranged between the outer wall of the handle interface and the inner wall of the support handle body. The medical knife tool further comprises a third sealing ring arranged between the proximal end surface of the support handle body and the distal end surface of the main body. The proximal end surface of the support handle body abuts against the distal end surface of the main body. The outer wall of the handle interface is provided with a first thread. The inner wall of the support handle body is provided with a second thread matched with the first thread. The handle interface and the support handle body are detachably connected through the first thread and the second thread.

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